AI Trajectory

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Seq	Timestamp	Type	Name	Duration
0/0	2026/09/19 03:49	flow	patch-triage	2m Args: null Results: { "EnableConfigs": [ "MACVLAN" ], "FocusSymbols": [ "macvlan_common_newlink", "macvlan_changelink", "macvlan_uninit", "macvlan_sync_address", "macvlan_device_event", "macvlan_open", "macvlan_stop", "macvlan_fdb_add", "macvlan_fdb_del" ], "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false, "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.", "WorthFuzzing": true }
1/1	2026/09/19 03:49	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit ae294554f8443ffab9a55f91b254932f3354f232\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Sat Sep 19 03:49:24 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c\nindex afad90b9222a2..76c11e5260334 100644\n--- a/drivers/net/macvlan.c\n+++ b/drivers/net/macvlan.c\n@@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port port)\n \tport-\u003eflags \|= MACVLAN_F_PASSTHRU;\n }\n \n+static inline void macvlan_clear_passthru(struct macvlan_port port)\n+{\n+\tport-\u003eflags \u0026= ~MACVLAN_F_PASSTHRU;\n+}\n+\n static inline bool macvlan_addr_change(const struct macvlan_port port)\n {\n \treturn port-\u003eflags \u0026 MACVLAN_F_ADDRCHANGE;\n@@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port port,\n \t * currently in use by the underlying device or\n \t * another macvlan.\n \t /\n-\tif (!macvlan_passthru(port) \u0026\u0026 !macvlan_addr_change(port) \u0026\u0026\n-\t ether_addr_equal_64bits(port-\u003edev-\u003edev_addr, addr))\n+\tif (ether_addr_equal_64bits(port-\u003edev-\u003edev_addr, addr))\n \t\treturn true;\n \n \tif (macvlan_hash_lookup(port, addr))\n@@ -637,7 +641,7 @@ static int macvlan_open(struct net_device dev)\n \tstruct net_device lowerdev = vlan-\u003elowerdev;\n \tint err;\n \n-\tif (macvlan_passthru(vlan-\u003eport)) {\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n \t\tif (!(vlan-\u003eflags \u0026 MACVLAN_FLAG_NOPROMISC)) {\n \t\t\terr = dev_set_promiscuity(lowerdev, 1);\n \t\t\tif (err \u003c 0)\n@@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device dev)\n \tdev_uc_unsync(lowerdev, dev);\n \tdev_mc_unsync(lowerdev, dev);\n \n-\tif (macvlan_passthru(vlan-\u003eport)) {\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n \t\tif (!(vlan-\u003eflags \u0026 MACVLAN_FLAG_NOPROMISC))\n \t\t\tdev_set_promiscuity(lowerdev, -1);\n \t\tgoto hash_del;\n@@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device dev,\n \tstruct macvlan_dev vlan = netdev_priv(dev);\n \tstruct net_device lowerdev = vlan-\u003elowerdev;\n \tstruct macvlan_port port = vlan-\u003eport;\n+\tbool passthru_dev = vlan-\u003emode == MACVLAN_MODE_PASSTHRU;\n \tint err;\n \n \tif (!(dev-\u003eflags \u0026 IFF_UP)) {\n \t\t/* Just copy in the new address /\n \t\teth_hw_addr_set(dev, addr);\n \t} else {\n-\t\t/ Rehash and update the device filters /\n-\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\n-\t\t\treturn -EADDRINUSE;\n+\t\tif (!passthru_dev) {\n+\t\t\t/ Rehash and update the device filters /\n+\t\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\n+\t\t\t\t\treturn -EADDRINUSE;\n \n-\t\tif (!macvlan_passthru(port)) {\n \t\t\terr = dev_uc_add(lowerdev, addr);\n \t\t\tif (err)\n \t\t\t\treturn err;\n@@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device dev,\n \n \t\tmacvlan_hash_change_addr(vlan, addr);\n \t}\n-\tif (macvlan_passthru(port) \u0026\u0026 !macvlan_addr_change(port)) {\n+\tif (passthru_dev \u0026\u0026 !macvlan_addr_change(port)) {\n \t\t/* Since addr_change isn't set, we are here due to lower\n \t\t * device change. Save the lower-dev address so we can\n \t\t * restore it later.\n@@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device dev)\n \n \tmacvlan_flush_sources(port, vlan);\n \tport-\u003ecount -= 1;\n-\tif (!port-\u003ecount)\n+\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n+\t\t/ If the lower device address has been changed by passthru\n+\t\t * macvlan, put it back.\n+\t\t \n+\t\t Caution: This triggers NETDEV_CHANGEADDR on\n+\t\t * the lower device. But we're in the green because\n+\t\t * the passthru interface is already off the list.\n+\t\t /\n+\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n+\t\t\tstruct sockaddr_storage ss;\n+\n+\t\t\tss.ss_family = port-\u003edev-\u003etype;\n+\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n+\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n+\t\t}\n+\t\tmacvlan_clear_passthru(port);\n+\t}\n+\n+\tif (port-\u003ecount == 0)\n \t\tmacvlan_port_destroy(port-\u003edev);\n }\n \n@@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg ndm, struct nlattr tb[],\n \t/ Support unicast filter only on passthru devices.\n \t * Multicast filter should be allowed on all devices.\n \t /\n-\tif (!macvlan_passthru(vlan-\u003eport) \u0026\u0026 is_unicast_ether_addr(addr))\n+\tif (vlan-\u003emode != MACVLAN_MODE_PASSTHRU \u0026\u0026 is_unicast_ether_addr(addr))\n \t\treturn -EOPNOTSUPP;\n \n \tif (flags \u0026 NLM_F_REPLACE)\n@@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg ndm, struct nlattr tb[],\n \t/ Support unicast filter only on passthru devices.\n \t * Multicast filter should be allowed on all devices.\n \t /\n-\tif (!macvlan_passthru(vlan-\u003eport) \u0026\u0026 is_unicast_ether_addr(addr))\n+\tif (vlan-\u003emode != MACVLAN_MODE_PASSTHRU \u0026\u0026 is_unicast_ether_addr(addr))\n \t\treturn -EOPNOTSUPP;\n \n \tif (is_unicast_ether_addr(addr))\n@@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device dev)\n \t\tkfree_skb(skb);\n \t}\n \n-\t/* If the lower device address has been changed by passthru\n-\t * macvlan, put it back.\n-\t /\n-\tif (macvlan_passthru(port) \u0026\u0026\n-\t !ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n-\t\tstruct sockaddr_storage ss;\n-\n-\t\tss.ss_family = port-\u003edev-\u003etype;\n-\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n-\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n-\t}\n-\n \tkfree(port);\n }\n \n@@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device dev,\n \t}\n \tport = macvlan_port_get_rtnl(lowerdev);\n \n-\t/* Only 1 macvlan device can be created in passthru mode /\n-\tif (macvlan_passthru(port)) {\n-\t\t/ The macvlan port must be not created this time,\n-\t\t * still goto destroy_macvlan_port for readability.\n-\t\t /\n-\t\terr = -EINVAL;\n-\t\tgoto destroy_macvlan_port;\n-\t}\n-\n \tvlan-\u003elowerdev = lowerdev;\n \tvlan-\u003edev = dev;\n \tvlan-\u003eport = port;\n@@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device dev,\n \tif (data \u0026\u0026 data[IFLA_MACVLAN_FLAGS])\n \t\tvlan-\u003eflags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);\n \n+\t/* Only 1 macvlan device can be created in passthru mode. There may be\n+\t * additional source mode devices but nothing else at the moment.\n+\t \n+\t First check if adding a source mode device to an existing passthru vlan.\n+\t /\n+\tif (macvlan_passthru(port) \u0026\u0026 vlan-\u003emode != MACVLAN_MODE_SOURCE) {\n+\t\t/ The macvlan port must be not created this time,\n+\t\t * still goto destroy_macvlan_port for readability.\n+\t\t /\n+\t\terr = -EINVAL;\n+\t\tgoto destroy_macvlan_port;\n+\t}\n+\n+\t/ Now check if adding a passthru device to an existing set of source mode\n+\t * devices.\n+\t /\n \tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n-\t\tif (port-\u003ecount) {\n-\t\t\terr = -EINVAL;\n-\t\t\tgoto destroy_macvlan_port;\n+\t\tstruct macvlan_dev p;\n+\n+\t\tlist_for_each_entry(p, \u0026port-\u003evlans, list) {\n+\t\t\tif (p-\u003emode != MACVLAN_MODE_SOURCE) {\n+\t\t\t\terr = -EINVAL;\n+\t\t\t\tgoto destroy_macvlan_port;\n+\t\t\t}\n \t\t}\n-\t\tmacvlan_set_passthru(port);\n \t\teth_hw_addr_inherit(dev, lowerdev);\n \t}\n \n@@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device dev,\n \tif (err)\n \t\tgoto unregister_netdev;\n \n-\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n+\t/ macvlan_handle_frame expects the (one and only) passthru device first. /\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n+\t\tmacvlan_set_passthru(port);\n+\t\tlist_add_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n+\t} else\n+\t\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n \tupdate_port_bc_queue_len(vlan-\u003eport);\n \tnetif_stacked_transfer_operstate(lowerdev, dev);\n \tlinkwatch_fire_event(dev);\n@@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device dev,\n \tif (data \u0026\u0026 data[IFLA_MACVLAN_MODE]) {\n \t\tset_mode = true;\n \t\tmode = nla_get_u32(data[IFLA_MACVLAN_MODE]);\n-\t\t/* Passthrough mode can't be set or cleared dynamically /\n-\t\tif ((mode == MACVLAN_MODE_PASSTHRU) !=\n-\t\t (vlan-\u003emode == MACVLAN_MODE_PASSTHRU))\n-\t\t\treturn -EINVAL;\n-\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE \u0026\u0026\n-\t\t vlan-\u003emode != mode)\n-\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n+\t\tif (mode != vlan-\u003emode) {\n+\t\t\t/ Passthrough mode can't be set or cleared dynamically,\n+\t\t\t * regardless of existing source interfaces. Furthermore, source\n+\t\t\t * interfaces can't switch modes within a passhtrough port.\n+\t\t\t /\n+\t\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU \|\|\n+\t\t\t macvlan_passthru(vlan-\u003eport))\n+\t\t\t\treturn -EINVAL;\n+\t\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE)\n+\t\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n+\t\t}\n \t}\n \n \tif (data \u0026\u0026 data[IFLA_MACVLAN_FLAGS]) {\n \t\t__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);\n \t\tbool promisc = (flags ^ vlan-\u003eflags) \u0026 MACVLAN_FLAG_NOPROMISC;\n-\t\tif (macvlan_passthru(vlan-\u003eport) \u0026\u0026 promisc) {\n+\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU \u0026\u0026 promisc) {\n \t\t\tint err;\n \n \t\t\tif (flags \u0026 MACVLAN_FLAG_NOPROMISC)\n@@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block unused,\n \t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\n \t\t\t\t\t\tstruct macvlan_dev,\n \t\t\t\t\t\tlist);\n-\n-\t\tif (vlan \u0026\u0026 macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n+\t\t/* Validate the interface mode again because we're potentially\n+\t\t * triggered upon removal of the passthru interface. In which\n+\t\t * case it is already off the list (and has restored the lower\n+\t\t * device mac already).\n+\t\t */\n+\t\tif (!vlan \|\| vlan-\u003emode != MACVLAN_MODE_PASSTHRU)\n+\t\t\treturn NOTIFY_DONE;\n+\t\tif (macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n \t\t\treturn NOTIFY_BAD;\n \n \t\tbreak;\n" }
2/1	2026/09/19 03:49	agent	patch-evaluator	1m Model: core Args: null Results: { "EnableConfigs": [ "MACVLAN" ], "FocusSymbols": [ "macvlan_common_newlink", "macvlan_changelink", "macvlan_uninit", "macvlan_sync_address", "macvlan_device_event", "macvlan_open", "macvlan_stop", "macvlan_fdb_add", "macvlan_fdb_del" ], "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer and security engineer. Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on internal assumptions. You must actively use your code access tools to inspect the actual source code, callers, and surrounding context. ================================================================================ 1. CORE TRIAGE PHILOSOPHY ================================================================================ The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs, and newly triggered assertions introduced by the patch series. - REACHABILITY IS THE PRIMARY GATE: Fuzzing can only discover bugs in code that can actually execute in standard virtualized environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap). If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed, regardless of whether it adds assertions or complex logic. - DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS: Patch authors routinely label changes as "cleanups", "refactorings", or state "No functional change intended". Do NOT take these claims at face value. Code refactorings that rearrange logic, introduce helper functions, or alter state management in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs. If reachable executable code is modified or refactored, it MUST be fuzzed. - NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED: When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON, VM_WARN_ON, BUG_ON, lockdep_assert) in reachable code paths, it enforces new or stricter invariants. Even if the author believes the invariant always holds, fuzzing is essential to verify whether an unusual sequence of operations can violate it. ================================================================================ 2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA) ================================================================================ Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories: - Non-kernel and non-executable changes: * Modifications to Documentation/, comments, or spelling fixes. * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/) that do not affect the compiled kernel image (vmlinux) or kernel modules. * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints that do not alter control flow or data structures. * Build system or Kconfig changes that do not alter compiled C logic. - Structurally unreachable hardware: * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU. - Unreachable execution paths: * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding. * Code paths exclusive to architectures other than the target architecture. ================================================================================ 3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA) ================================================================================ Return WorthFuzzing=true whenever the patch touches reachable executable code, including: - Core Subsystems: * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/), BPF, scheduler, core networking, VFS, or syscall handling. - Refactorings and Code Cleanups: * Any restructuring of reachable data structures, helper abstractions, or algorithm flows. - Runtime Assertions and Defensive Checks: * Any introduction or alteration of assertions (WARN_ON, VM_WARN_ON, BUG_ON, etc.) in reachable paths. - Reachable Drivers and Protocols: Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.). ================================================================================ 4. EXTRACTING FocusSymbols (PREVENTING DILUTION) ================================================================================ When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer: - AVOID UBIQUITOUS LIFECYCLE HOT-PATHS: Do NOT list generic, ubiquitous functions called by almost every program in the corpus (including, but not limited to: general memory allocators and deallocators, page fault and trap handlers, or core synchronization primitives; this is not an exhaustive list). Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused", which severely dilutes fuzzing effort away from the actual changes. - TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS: List functions that specifically implement the logic being added or altered, or direct API entrypoints for the subsystem feature under review. - HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h): Compiler-inlined static functions (such as static inlines in mm/.h or include/linux/.h) lack distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters. If the changes are primarily in static inline helpers, identify non-static, feature-specific caller functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers). ================================================================================ 5. IDENTIFYING EnableConfigs ================================================================================ Identify any specific CONFIG_ options required to properly compile and reach the modified code: - Inspect Kconfig files and #ifdef guards; do not make assumptions. - Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed. - Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit ae294554f8443ffab9a55f91b254932f3354f232 Author: syz-cluster <triage@syzkaller.com> Date: Sat Sep 19 03:49:24 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index afad90b9222a2..76c11e5260334 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port port) port->flags \|= MACVLAN_F_PASSTHRU; } +static inline void macvlan_clear_passthru(struct macvlan_port port) +{ + port->flags &= ~MACVLAN_F_PASSTHRU; +} + static inline bool macvlan_addr_change(const struct macvlan_port port) { return port->flags & MACVLAN_F_ADDRCHANGE; @@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port port, * currently in use by the underlying device or * another macvlan. / - if (!macvlan_passthru(port) && !macvlan_addr_change(port) && - ether_addr_equal_64bits(port->dev->dev_addr, addr)) + if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) return true; if (macvlan_hash_lookup(port, addr)) @@ -637,7 +641,7 @@ static int macvlan_open(struct net_device dev) struct net_device lowerdev = vlan->lowerdev; int err; - if (macvlan_passthru(vlan->port)) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { err = dev_set_promiscuity(lowerdev, 1); if (err < 0) @@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device dev) dev_uc_unsync(lowerdev, dev); dev_mc_unsync(lowerdev, dev); - if (macvlan_passthru(vlan->port)) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) dev_set_promiscuity(lowerdev, -1); goto hash_del; @@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device dev, struct macvlan_dev vlan = netdev_priv(dev); struct net_device lowerdev = vlan->lowerdev; struct macvlan_port port = vlan->port; + bool passthru_dev = vlan->mode == MACVLAN_MODE_PASSTHRU; int err; if (!(dev->flags & IFF_UP)) { /* Just copy in the new address / eth_hw_addr_set(dev, addr); } else { - / Rehash and update the device filters / - if (macvlan_addr_busy(vlan->port, addr)) - return -EADDRINUSE; + if (!passthru_dev) { + / Rehash and update the device filters / + if (macvlan_addr_busy(vlan->port, addr)) + return -EADDRINUSE; - if (!macvlan_passthru(port)) { err = dev_uc_add(lowerdev, addr); if (err) return err; @@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device dev, macvlan_hash_change_addr(vlan, addr); } - if (macvlan_passthru(port) && !macvlan_addr_change(port)) { + if (passthru_dev && !macvlan_addr_change(port)) { /* Since addr_change isn't set, we are here due to lower * device change. Save the lower-dev address so we can * restore it later. @@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device dev) macvlan_flush_sources(port, vlan); port->count -= 1; - if (!port->count) + + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + / If the lower device address has been changed by passthru + * macvlan, put it back. + * + * Caution: This triggers NETDEV_CHANGEADDR on + * the lower device. But we're in the green because + * the passthru interface is already off the list. + / + if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { + struct sockaddr_storage ss; + + ss.ss_family = port->dev->type; + memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); + dev_set_mac_address(port->dev, &ss, NULL); + } + macvlan_clear_passthru(port); + } + + if (port->count == 0) macvlan_port_destroy(port->dev); } @@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg ndm, struct nlattr tb[], / Support unicast filter only on passthru devices. * Multicast filter should be allowed on all devices. / - if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr)) return -EOPNOTSUPP; if (flags & NLM_F_REPLACE) @@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg ndm, struct nlattr tb[], / Support unicast filter only on passthru devices. * Multicast filter should be allowed on all devices. / - if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr)) return -EOPNOTSUPP; if (is_unicast_ether_addr(addr)) @@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device dev) kfree_skb(skb); } - /* If the lower device address has been changed by passthru - * macvlan, put it back. - / - if (macvlan_passthru(port) && - !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { - struct sockaddr_storage ss; - - ss.ss_family = port->dev->type; - memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); - dev_set_mac_address(port->dev, &ss, NULL); - } - kfree(port); } @@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device dev, } port = macvlan_port_get_rtnl(lowerdev); - /* Only 1 macvlan device can be created in passthru mode / - if (macvlan_passthru(port)) { - / The macvlan port must be not created this time, - * still goto destroy_macvlan_port for readability. - / - err = -EINVAL; - goto destroy_macvlan_port; - } - vlan->lowerdev = lowerdev; vlan->dev = dev; vlan->port = port; @@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device dev, if (data && data[IFLA_MACVLAN_FLAGS]) vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); + /* Only 1 macvlan device can be created in passthru mode. There may be + * additional source mode devices but nothing else at the moment. + * + * First check if adding a source mode device to an existing passthru vlan. + / + if (macvlan_passthru(port) && vlan->mode != MACVLAN_MODE_SOURCE) { + / The macvlan port must be not created this time, + * still goto destroy_macvlan_port for readability. + / + err = -EINVAL; + goto destroy_macvlan_port; + } + + / Now check if adding a passthru device to an existing set of source mode + * devices. + / if (vlan->mode == MACVLAN_MODE_PASSTHRU) { - if (port->count) { - err = -EINVAL; - goto destroy_macvlan_port; + struct macvlan_dev p; + + list_for_each_entry(p, &port->vlans, list) { + if (p->mode != MACVLAN_MODE_SOURCE) { + err = -EINVAL; + goto destroy_macvlan_port; + } } - macvlan_set_passthru(port); eth_hw_addr_inherit(dev, lowerdev); } @@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device dev, if (err) goto unregister_netdev; - list_add_tail_rcu(&vlan->list, &port->vlans); + / macvlan_handle_frame expects the (one and only) passthru device first. / + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + macvlan_set_passthru(port); + list_add_rcu(&vlan->list, &port->vlans); + } else + list_add_tail_rcu(&vlan->list, &port->vlans); update_port_bc_queue_len(vlan->port); netif_stacked_transfer_operstate(lowerdev, dev); linkwatch_fire_event(dev); @@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device dev, if (data && data[IFLA_MACVLAN_MODE]) { set_mode = true; mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); - /* Passthrough mode can't be set or cleared dynamically / - if ((mode == MACVLAN_MODE_PASSTHRU) != - (vlan->mode == MACVLAN_MODE_PASSTHRU)) - return -EINVAL; - if (vlan->mode == MACVLAN_MODE_SOURCE && - vlan->mode != mode) - macvlan_flush_sources(vlan->port, vlan); + if (mode != vlan->mode) { + / Passthrough mode can't be set or cleared dynamically, + * regardless of existing source interfaces. Furthermore, source + * interfaces can't switch modes within a passhtrough port. + / + if (vlan->mode == MACVLAN_MODE_PASSTHRU \|\| + macvlan_passthru(vlan->port)) + return -EINVAL; + if (vlan->mode == MACVLAN_MODE_SOURCE) + macvlan_flush_sources(vlan->port, vlan); + } } if (data && data[IFLA_MACVLAN_FLAGS]) { __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; - if (macvlan_passthru(vlan->port) && promisc) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU && promisc) { int err; if (flags & MACVLAN_FLAG_NOPROMISC) @@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block unused, vlan = list_first_entry_or_null(&port->vlans, struct macvlan_dev, list); - - if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) + /* Validate the interface mode again because we're potentially + * triggered upon removal of the passthru interface. In which + * case it is already off the list (and has restored the lower + * device mac already). + */ + if (!vlan \|\| vlan->mode != MACVLAN_MODE_PASSTHRU) + return NOTIFY_DONE; + if (macvlan_sync_address(vlan->dev, dev->dev_addr)) return NOTIFY_BAD; break;
3/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 6296 output: 27 thoughts: 327 Thoughts: Analyzing a Macvlan Patch Okay, so this patch is touching `drivers/net/macvlan.c`. Right, macvlan... let me refresh my memory. It's a virtual network device driver in Linux, allowing multiple virtual interfaces to share a single physical or virtual NIC, each with its own MAC address. Makes sense. It’s useful, particularly in virtualized environments. Hmm, are there any implications for standard virtualized setups, like QEMU or even with something like syzkaller? Oh yeah, Syzkaller uses this all the time, particularly leveraging netlink for it and especially `RTM_NEWLINK` with `macvlan` link info to create macvlan interfaces. Good to keep in mind. Now, where are the changes? The patch is all over the place within the macvlan code. Looks like it's touching `macvlan_clear_passthru`, `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_uninit`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_port_destroy`, `macvlan_common_newlink`, `macvlan_changelink`, and `macvlan_device_event`. Seems comprehensive. It looks like the key changes allow mixing `MACVLAN_MODE_PASSTHRU` and `MACVLAN_MODE_SOURCE` devices. That could get interesting. It's also changing the tracking and uninitialization of passthru mode, address synchronization, how `macvlan_open` and `macvlan_stop` work, as well as `macvlan_uninit`, where it's restoring the lower device's MAC address and clearing passthru, among other things. I need to dig into the details to understand the specific implications of these changes in the code. I better check the Kconfig for macvlan as well, to make sure this doesn't introduce any surprises there.
4/2	2026/09/19 03:49	tool	grepper	0m Args: { "Expression": "MACVLAN", "PathPrefix": "drivers/net/" } Results: { "Output": "\nFull output is too long, showing 500 out of 973 lines.\nUse more precise expression if possible.\n\ndrivers/net/Kconfig=163=source \"drivers/net/team/Kconfig\"\ndrivers/net/Kconfig-164-\ndrivers/net/Kconfig:165:config MACVLAN\ndrivers/net/Kconfig-166-\ttristate \"MAC-VLAN support\"\n--\ndrivers/net/Kconfig=179=config MACVTAP\ndrivers/net/Kconfig-180-\ttristate \"MAC-VLAN based tap driver\"\ndrivers/net/Kconfig:181:\tdepends on MACVLAN\ndrivers/net/Kconfig-182-\tdepends on INET\n--\ndrivers/net/Makefile=18=obj-$(CONFIG_AMT) += amt.o\ndrivers/net/Makefile:19:obj-$(CONFIG_MACVLAN) += macvlan.o\ndrivers/net/Makefile-20-obj-$(CONFIG_MACVTAP) += macvtap.o\n--\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h=10=enum HCLGE_MBX_OPCODE {\n--\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h-18-\tHCLGE_MBX_SET_PROMISC_MODE,\t/* (VF -\u003e PF) set promiscuous mode /\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h:19:\tHCLGE_MBX_SET_MACVLAN,\t\t/ (VF -\u003e PF) set unicast filter /\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h-20-\tHCLGE_MBX_API_NEGOTIATE,\t/ (VF -\u003e PF) negotiate API version /\n--\ndrivers/net/ethernet/intel/fm10k/fm10k.h=268=enum fm10k_state_t {\n--\ndrivers/net/ethernet/intel/fm10k/fm10k.h-275-\t__FM10K_SERVICE_DISABLE,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:276:\t__FM10K_MACVLAN_SCHED,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:277:\t__FM10K_MACVLAN_REQUEST,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:278:\t__FM10K_MACVLAN_DISABLE,\ndrivers/net/ethernet/intel/fm10k/fm10k.h-279-\t__FM10K_LINK_DOWN,\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c=410=static void fm10k_type_trans(struct fm10k_ring rx_ring,\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c-416-\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c:417:\t/* check to see if DGLORT belongs to a MACVLAN /\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c-418-\tif (l2_accel) {\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c=1176=void fm10k_reset_rx_state(struct fm10k_intfc interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c-1181-\t/* Wait for MAC/VLAN work to finish /\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c:1182:\twhile (test_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c-1183-\t\tusleep_range(1000, 2000);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=85=void fm10k_macvlan_schedule(struct fm10k_intfc interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-89-\t /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:90:\tif (!test_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate) \u0026\u0026\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:91:\t !test_and_set_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate)) {\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:92:\t\tclear_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-93-\t\t/ We delay the actual start of execution in order to allow\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-100-\t} else {\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:101:\t\tset_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-102-\t}\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=112=static void fm10k_stop_macvlan_task(struct fm10k_intfc interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-114-\t/ Disable the MAC/VLAN work item /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:115:\tset_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-116-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-119-\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:120:\t/ We set the __FM10K_MACVLAN_SCHED bit when we schedule the task.\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-121-\t * However, it may not be unset of the MAC/VLAN task never actually\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-125-\t /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:126:\tclear_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-127-}\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-132- \ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:133: * Clear the __FM10K_MACVLAN_DISABLE bit and, if a request occurred, schedule\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-134- * the MAC/VLAN work monitor.\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=136=static void fm10k_resume_macvlan_task(struct fm10k_intfc interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-138-\t/ Re-enable the MAC/VLAN work item /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:139:\tclear_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-140-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-143-\t /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:144:\tif (test_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-145-\t\tfm10k_macvlan_schedule(interface);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=765=static void fm10k_macvlan_task(struct work_struct work)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-802-\t\t\thw-\u003embx.ops.process(hw, \u0026hw-\u003embx);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:803:\t\t\tset_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-804-\t\t\tfm10k_mbx_unlock(interface);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-845-done:\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:846:\tWARN_ON(!test_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate));\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-847-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-849-\tsmp_mb__before_atomic();\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:850:\tclear_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-851-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-855-\t /\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:856:\tif (test_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-857-\t\tfm10k_macvlan_schedule(interface);\n--\ndrivers/net/ethernet/intel/i40e/i40e.h=83=enum i40e_state {\n--\ndrivers/net/ethernet/intel/i40e/i40e.h-112-\t__I40E_VF_DISABLE,\ndrivers/net/ethernet/intel/i40e/i40e.h:113:\t__I40E_MACVLAN_SYNC_PENDING,\ndrivers/net/ethernet/intel/i40e/i40e.h-114-\t__I40E_TEMP_LINK_POLLING,\n--\ndrivers/net/ethernet/intel/i40e/i40e.h=815=struct i40e_vsi {\n--\ndrivers/net/ethernet/intel/i40e/i40e.h-924-\t/* macvlan fields /\ndrivers/net/ethernet/intel/i40e/i40e.h:925:#define I40E_MAX_MACVLANS\t\t128 / Max HW vectors - 1 on FVL /\ndrivers/net/ethernet/intel/i40e/i40e.h:926:#define I40E_MIN_MACVLAN_VECTORS\t2 / Min vectors to enable macvlans /\ndrivers/net/ethernet/intel/i40e/i40e.h:927:\tDECLARE_BITMAP(fwd_bitmask, I40E_MAX_MACVLANS);\ndrivers/net/ethernet/intel/i40e/i40e.h-928-\tstruct list_head macvlan_list;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=755=struct i40e_aqc_macvlan {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-757-\t__le16\tseid[3];\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:758:#define I40E_AQC_MACVLAN_CMD_SEID_VALID\t\t0x8000\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-759-\t__le32\taddr_high;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=766=struct i40e_aqc_add_macvlan_element_data {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-769-\t__le16\tflags;\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:770:#define I40E_AQC_MACVLAN_ADD_PERFECT_MATCH\t0x0001\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:771:#define I40E_AQC_MACVLAN_ADD_IGNORE_VLAN\t0x0004\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:772:#define I40E_AQC_MACVLAN_ADD_USE_SHARED_MAC\t0x0010\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-773-\t__le16\tqueue_number;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=796=struct i40e_aqc_remove_macvlan_element_data {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-799-\tu8\tflags;\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:800:#define I40E_AQC_MACVLAN_DEL_PERFECT_MATCH\t0x01\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:801:#define I40E_AQC_MACVLAN_DEL_IGNORE_VLAN\t0x08\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-802-\tu8\treserved[3];\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2198=i40e_prepare_add_macvlan(struct i40e_aqc_add_macvlan_element_data mv_list,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2209-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2210:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID \| seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2211-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2216-\t\t\tmv_list[i].flags \|=\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2217:\t\t\t cpu_to_le16(I40E_AQC_MACVLAN_ADD_USE_SHARED_MAC);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2218-\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2297=i40e_aq_remove_macvlan(struct i40e_hw hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2314-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2315:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID \| seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2316-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2345=i40e_aq_remove_macvlan_v2(struct i40e_hw hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2362-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2363:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID \| seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2364-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=3681=int i40e_set_filter_control(struct i40e_hw hw,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3720-\ndrivers/net/ethernet/intel/i40e/i40e_common.c:3721:\t/ Enable FDIR, Ethertype and MACVLAN filters for PF and VFs /\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3722-\tif (settings-\u003eenable_fdir)\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3726-\tif (settings-\u003eenable_macvlan)\ndrivers/net/ethernet/intel/i40e/i40e_common.c:3727:\t\tval \|= I40E_PFQF_CTL_0_MACVLAN_ENA_MASK;\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3728-\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1611=static void i40e_rm_default_mac_filter(struct i40e_vsi vsi, u8 macaddr)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1623-\t/ Ignore error returns, some firmware does it this way... /\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1624:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1625-\ti40e_aq_remove_macvlan(\u0026pf-\u003ehw, vsi-\u003eseid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1630-\t/ ...and some firmware does it this way. /\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1631:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH \|\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1632:\t\t\tI40E_AQC_MACVLAN_DEL_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1633-\ti40e_aq_remove_macvlan(\u0026pf-\u003ehw, vsi-\u003eseid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1647=struct i40e_mac_filter i40e_add_filter(struct i40e_vsi vsi,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1676-\t\tvsi-\u003eflags \|= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1677:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1678-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1708=void __i40e_del_filter(struct i40e_vsi vsi, struct i40e_mac_filter f)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1725-\tvsi-\u003eflags \|= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1726:\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1727-}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2230=static void i40e_set_rx_mode(struct net_device netdev)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2244-\t\tvsi-\u003eflags \|= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2245:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2246-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2555=int i40e_sync_vsi_filters(struct i40e_vsi vsi)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2682-\t\t\t\tdel_list[num_del].vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2683:\t\t\t\tcmd_flags \|= I40E_AQC_MACVLAN_DEL_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2684-\t\t\t} else {\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2688-\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2689:\t\t\tcmd_flags \|= I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2690-\t\t\tdel_list[num_del].flags = cmd_flags;\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2747-\t\t\t\tadd_list[num_add].vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2748:\t\t\t\tcmd_flags \|= I40E_AQC_MACVLAN_ADD_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2749-\t\t\t} else {\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2755-\t\t\tadd_list[num_add].match_method = I40E_AQC_MM_ERR_NO_RES;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2756:\t\t\tcmd_flags \|= I40E_AQC_MACVLAN_ADD_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2757-\t\t\tadd_list[num_add].flags = cpu_to_le16(cmd_flags);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2894=static void i40e_sync_filters_subtask(struct i40e_pf pf)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2900-\t\treturn;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2901:\tif (!test_and_clear_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate))\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2902-\t\treturn;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2903-\tif (test_bit(__I40E_VF_DISABLE, pf-\u003estate)) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2904:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2905-\t\treturn;\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2914-\t\t\t\t/* come back and try again later /\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2915:\t\t\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING,\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2916-\t\t\t\t\tpf-\u003estate);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=7713=static int i40e_del_macvlan_filter(struct i40e_hw hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7721-\telement.vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:7722:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7723-\tstatus = i40e_aq_remove_macvlan(hw, seid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=7739=static int i40e_add_macvlan_filter(struct i40e_hw hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7749-\telement.match_method = I40E_AQC_MM_ERR_NO_RES;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:7750:\tcmd_flags \|= I40E_AQC_MACVLAN_ADD_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7751-\telement.flags = cpu_to_le16(cmd_flags);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=8005=static void i40e_fwd_add(struct net_device netdev, struct net_device vdev)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8021-\t}\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8022:\tif (pf-\u003enum_lan_msix \u003c I40E_MIN_MACVLAN_VECTORS) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8023-\t\tnetdev_info(netdev, \"Not enough vectors available to support macvlans\\n\");\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8041-\t\tvectors = pf-\u003enum_lan_msix;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8042:\t\tif (vectors \u003c= I40E_MAX_MACVLANS \u0026\u0026 vectors \u003e 64) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8043-\t\t\t/* allocate 4 Qs per macvlan and 32 Qs to the PF/\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8080-\t\t\t\t\t vsi-\u003emacvlan_cnt);\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8081:\tif (avail_macvlan \u003e= I40E_MAX_MACVLANS)\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8082-\t\treturn ERR_PTR(-EBUSY);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=13905=static int i40e_add_vsi(struct i40e_vsi vsi)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-14121-\t\tvsi-\u003eflags \|= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:14122:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-14123-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=15241=static int i40e_setup_pf_filter_control(struct i40e_pf pf)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15251-\ndrivers/net/ethernet/intel/i40e/i40e_main.c:15252:\t/ Ethtype and MACVLAN filters enabled for PF /\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15253-\tsettings-\u003eenable_ethtype = true;\n--\ndrivers/net/ethernet/intel/i40e/i40e_register.h-623-#define I40E_PFQF_CTL_0_ETYPE_ENA_MASK I40E_MASK(0x1, I40E_PFQF_CTL_0_ETYPE_ENA_SHIFT)\ndrivers/net/ethernet/intel/i40e/i40e_register.h:624:#define I40E_PFQF_CTL_0_MACVLAN_ENA_SHIFT 19\ndrivers/net/ethernet/intel/i40e/i40e_register.h:625:#define I40E_PFQF_CTL_0_MACVLAN_ENA_MASK I40E_MASK(0x1, I40E_PFQF_CTL_0_MACVLAN_ENA_SHIFT)\ndrivers/net/ethernet/intel/i40e/i40e_register.h-626-#define I40E_PFQF_CTL_1 0x00245D80 / Reset: CORER /\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=2830=static int i40e_vc_get_stats_msg(struct i40e_vf vf, u8 msg)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2864-\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2865:#define I40E_MAX_MACVLAN_PER_HW 3072\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2866:#define I40E_MAX_MACVLAN_PER_PF(num_ports) (I40E_MAX_MACVLAN_PER_HW /\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2867-\t(num_ports))\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2873-\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2874:#define I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(vf_num, num_ports)\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2875-({\ttypeof(vf_num) vf_num_ = (vf_num);\t\t\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2876-\ttypeof(num_ports) num_ports_ = (num_ports);\t\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2877:\t((I40E_MAX_MACVLAN_PER_PF(num_ports_) - vf_num_ \t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2878-\tI40E_VC_MAX_MAC_ADDR_PER_VF) / vf_num_) +\t\t\t\\\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=2897=static inline int i40e_check_vf_permission(struct i40e_vf vf,\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2954-\telse\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2955:\t\tmac_add_max = I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(pf-\u003enum_alloc_vfs, hw-\u003enum_ports);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2956-\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=4954=int i40e_ndo_set_vf_trust(struct net_device netdev, int vf_id, bool setting)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-4986-\t/* request PF to sync mac/vlan filters for the VF /\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4987:\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-4988-\tpf-\u003evsi[vf-\u003elan_vsi_idx]-\u003eflags \|= I40E_VSI_FLAG_FILTER_CHANGED;\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=148=enum ixgbe_tx_flags {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-174-#define MAX_EMULATION_MAC_ADDRS 16\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:175:#define IXGBE_MAX_PF_MACVLANS 15\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-176-#define VMDQ_P(p) ((p) + adapter-\u003ering_feature[RING_F_VMDQ].offset)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=409=enum ixgbe_ring_f_enum {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-430-#define IXGBE_BAD_L2A_QUEUE\t\t3\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:431:#define IXGBE_MAX_MACVLANS\t\t63\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-432-\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=616=struct ixgbe_adapter {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-828-\t/ Bitmask indicating in use pools /\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:829:\tDECLARE_BITMAP(fwd_bitmask, IXGBE_MAX_MACVLANS + 1);\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-830-\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c=1889=void ixgbe_process_skb_fields(struct ixgbe_ring rx_ring,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-1913-\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c:1914:\t/* record Rx queue, or update MACVLAN statistics /\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-1915-\tif (netif_is_ixgbe(dev))\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c=10741=static void ixgbe_fwd_add(struct net_device pdev, struct net_device vdev)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-10773-\t\t adapter-\u003enum_rx_pools \u003e= (MAX_TX_QUEUES / tcs)) \|\|\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c:10774:\t\t adapter-\u003enum_rx_pools \u003e IXGBE_MAX_MACVLANS)\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-10775-\t\t\treturn ERR_PTR(-EBUSY);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h=46=enum ixgbe_pfvf_api_rev {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h-67-#define IXGBE_VF_SET_LPE\t0x05 /* VF requests PF to set VMOLR.LPE /\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h:68:#define IXGBE_VF_SET_MACVLAN\t0x06 / VF requests PF for unicast filter /\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h-69-#define IXGBE_VF_API_NEGOTIATE\t0x08 / negotiate API version /\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=25=static inline void ixgbe_alloc_vf_macvlans(struct ixgbe_adapter adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-35-\tnum_vf_macvlans = hw-\u003emac.num_rar_entries -\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:36:\t\t\t (IXGBE_MAX_PF_MACVLANS + 1 + num_vfs);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-37-\tif (!num_vf_macvlans)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=643=static int ixgbe_set_vf_macvlan(struct ixgbe_adapter adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-680-\t memory allocation for the list failed, which is not fatal but does\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:681:\t * mean we can't support VF requests for MACVLAN because we couldn't\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-682-\t * allocate memory for the list management required.\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=995=static int ixgbe_set_vf_macvlan_msg(struct ixgbe_adapter adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1004-\t\te_warn(drv,\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1005:\t\t \"VF %d requested MACVLAN filter but is administratively denied\\n\",\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1006-\t\t vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1031-\t\te_warn(drv,\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1032:\t\t \"VF %d has requested a MACVLAN filter but there is no space for it\\n\",\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1033-\t\t vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=1328=static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter adapter, u32 vf)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1374-\t\tbreak;\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1375:\tcase IXGBE_VF_SET_MACVLAN:\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1376-\t\tretval = ixgbe_set_vf_macvlan_msg(adapter, msgbuf, vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h=2572=enum ixgbe_fdir_pballoc_type {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h-2591-#define IXGBE_FDIRCTRL_FILTERMODE_SHIFT\t\t21\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h:2592:#define IXGBE_FDIRCTRL_FILTERMODE_MACVLAN\t0x0001 /* bit 23:21, 001b /\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h-2593-#define IXGBE_FDIRCTRL_FILTERMODE_CLOUD\t\t0x0002 / bit 23:21, 010b /\n--\ndrivers/net/ethernet/intel/ixgbevf/mbx.h=61=enum ixgbe_pfvf_api_rev {\n--\ndrivers/net/ethernet/intel/ixgbevf/mbx.h-82-#define IXGBE_VF_SET_LPE\t0x05 / VF requests PF to set VMOLR.LPE /\ndrivers/net/ethernet/intel/ixgbevf/mbx.h:83:#define IXGBE_VF_SET_MACVLAN\t0x06 / VF requests PF for unicast filter /\ndrivers/net/ethernet/intel/ixgbevf/mbx.h-84-#define IXGBE_VF_API_NEGOTIATE\t0x08 / negotiate API version /\n--\ndrivers/net/ethernet/intel/ixgbevf/vf.c=250=static s32 ixgbevf_set_uc_addr_vf(struct ixgbe_hw hw, u32 index, u8 addr)\n--\ndrivers/net/ethernet/intel/ixgbevf/vf.c-262-\tmsgbuf[0] \|= index \u003c\u003c IXGBE_VT_MSGINFO_SHIFT;\ndrivers/net/ethernet/intel/ixgbevf/vf.c:263:\tmsgbuf[0] \|= IXGBE_VF_SET_MACVLAN;\ndrivers/net/ethernet/intel/ixgbevf/vf.c-264-\tmsgbuf_chk = msgbuf[0];\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c=1186=int mlx4_QUERY_PORT(struct mlx4_dev dev, int port, struct mlx4_port_cap port_cap)\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1221-#define QUERY_PORT_MAX_GID_PKEY_OFFSET\t\t0x07\ndrivers/net/ethernet/mellanox/mlx4/fw.c:1222:#define QUERY_PORT_MAX_MACVLAN_OFFSET\t\t0x0a\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1223-#define QUERY_PORT_MAX_VL_OFFSET\t\t0x0b\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1249-\t\tport_cap-\u003emax_tc_eth\t = field \u003e\u003e 4;\ndrivers/net/ethernet/mellanox/mlx4/fw.c:1250:\t\tMLX4_GET(field, outbox, QUERY_PORT_MAX_MACVLAN_OFFSET);\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1251-\t\tport_cap-\u003elog_max_macs = field \u0026 0xf;\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c=436=static bool mlx5e_rep_macvlan_mode_supported(const struct net_device dev)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c-439-\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c:440:\treturn macvlan-\u003emode == MACVLAN_MODE_PASSTHRU;\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c-441-}\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h=330=enum ionic_lif_type {\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-331-\tIONIC_LIF_TYPE_CLASSIC = 0,\ndrivers/net/ethernet/pensando/ionic/ionic_if.h:332:\tIONIC_LIF_TYPE_MACVLAN = 1,\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-333-\tIONIC_LIF_TYPE_NETQUEUE = 2,\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h=2033=enum ionic_rx_filter_match_type {\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-2050- \t@mac.addr: MAC address (network-byte order)\ndrivers/net/ethernet/pensando/ionic/ionic_if.h:2051: @mac_vlan: MACVLAN filter\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-2052- \t@mac_vlan.vlan: VLAN ID\n--\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h=44=enum wx_pfvf_api_rev {\n--\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h-55-#define WX_VF_SET_LPE 0x05 / VF requests PF to set VMOLR.LPE /\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h:56:#define WX_VF_SET_MACVLAN 0x06 / VF requests PF unicast filter /\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h-57-#define WX_VF_API_NEGOTIATE 0x08 / negotiate API version /\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=22=static int wx_alloc_vf_macvlans(struct wx wx, u8 num_vfs)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-30-\tnum_vf_macvlans = wx-\u003emac.num_rar_entries -\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:31:\t\t\t (WX_MAX_PF_MACVLANS + 1 + num_vfs);\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-32-\tif (!num_vf_macvlans)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=639=static int wx_set_vf_macvlan_msg(struct wx wx, u32 msgbuf, u16 vf)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-646-\tif (wx-\u003evfinfo[vf].pf_set_mac \u0026\u0026 index \u003e 0) {\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:647:\t\twx_err(wx, \"VF %d request MACVLAN filter but is denied\\n\", vf);\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-648-\t\treturn -EINVAL;\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-666-\t\twx_err(wx,\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:667:\t\t \"VF %d request MACVLAN filter but there is no space\\n\",\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-668-\t\t vf);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=755=static void wx_rcv_msg_from_vf(struct wx wx, u16 vf)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-799-\t\tbreak;\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:800:\tcase WX_VF_SET_MACVLAN:\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-801-\t\tretval = wx_set_vf_macvlan_msg(wx, msgbuf, vf);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_type.h-23-#define WX_PCI_LINK_STATUS 0xB2\ndrivers/net/ethernet/wangxun/libwx/wx_type.h:24:#define WX_MAX_PF_MACVLANS 15\ndrivers/net/ethernet/wangxun/libwx/wx_type.h-25-#define WX_MAX_VF_MC_ENTRIES 30\n--\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c=349=int wx_set_uc_addr_vf(struct wx wx, u32 index, u8 addr)\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-350-{\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c:351:\tu32 msgbuf[3] = {WX_VF_SET_MACVLAN};\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-352-\tu8 msg_addr = (u8 )(\u0026msgbuf[1]);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-369-\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c:370:\tif (msgbuf[0] == (WX_VF_SET_MACVLAN \| WX_VT_MSGTYPE_NACK))\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-371-\t\treturn -EINVAL;\n--\ndrivers/net/macvlan.c-36-\ndrivers/net/macvlan.c:37:#define MACVLAN_HASH_BITS\t8\ndrivers/net/macvlan.c:38:#define MACVLAN_HASH_SIZE\t(1\u003c\u003cMACVLAN_HASH_BITS)\ndrivers/net/macvlan.c:39:#define MACVLAN_DEFAULT_BC_QUEUE_LEN\t1000\ndrivers/net/macvlan.c-40-\ndrivers/net/macvlan.c:41:#define MACVLAN_F_PASSTHRU\t1\ndrivers/net/macvlan.c:42:#define MACVLAN_F_ADDRCHANGE\t2\ndrivers/net/macvlan.c-43-\ndrivers/net/macvlan.c=44=struct macvlan_port {\ndrivers/net/macvlan.c-45-\tstruct net_device\tdev;\ndrivers/net/macvlan.c:46:\tstruct hlist_head\tvlan_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c-47-\tstruct list_head\tvlans;\n--\ndrivers/net/macvlan.c-53-\tint\t\t\tcount;\ndrivers/net/macvlan.c:54:\tstruct hlist_head\tvlan_source_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c:55:\tDECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);\ndrivers/net/macvlan.c:56:\tDECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);\ndrivers/net/macvlan.c-57-\tunsigned char perm_addr[ETH_ALEN];\n--\ndrivers/net/macvlan.c=67=struct macvlan_skb_cb {\n--\ndrivers/net/macvlan.c-70-\ndrivers/net/macvlan.c:71:#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb )\u0026((__skb)-\u003ecb[0]))\ndrivers/net/macvlan.c-72-\n--\ndrivers/net/macvlan.c=76=static inline bool macvlan_passthru(const struct macvlan_port port)\ndrivers/net/macvlan.c-77-{\ndrivers/net/macvlan.c:78:\treturn port-\u003eflags \u0026 MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-79-}\n--\ndrivers/net/macvlan.c=81=static inline void macvlan_set_passthru(struct macvlan_port port)\ndrivers/net/macvlan.c-82-{\ndrivers/net/macvlan.c:83:\tport-\u003eflags \|= MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-84-}\n--\ndrivers/net/macvlan.c=86=static inline void macvlan_clear_passthru(struct macvlan_port port)\ndrivers/net/macvlan.c-87-{\ndrivers/net/macvlan.c:88:\tport-\u003eflags \u0026= ~MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-89-}\n--\ndrivers/net/macvlan.c=91=static inline bool macvlan_addr_change(const struct macvlan_port port)\ndrivers/net/macvlan.c-92-{\ndrivers/net/macvlan.c:93:\treturn port-\u003eflags \u0026 MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-94-}\n--\ndrivers/net/macvlan.c=96=static inline void macvlan_set_addr_change(struct macvlan_port port)\ndrivers/net/macvlan.c-97-{\ndrivers/net/macvlan.c:98:\tport-\u003eflags \|= MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-99-}\n--\ndrivers/net/macvlan.c=101=static inline void macvlan_clear_addr_change(struct macvlan_port port)\ndrivers/net/macvlan.c-102-{\ndrivers/net/macvlan.c:103:\tport-\u003eflags \u0026= ~MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-104-}\n--\ndrivers/net/macvlan.c=107=static u32 macvlan_eth_hash(const unsigned char addr)\n\n" }
5/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 22444 output: 34 thoughts: 17 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into the Kernel Network Configuration Okay, so I need to zero in on a specific network-related configuration detail. My initial hunch is that it's likely defined within `drivers/net/Kconfig`, given that this is where a vast majority of the network driver configurations reside. I'm going to jump straight to the general area of line 165. While I don't know the specifics, based on my experience, that line number falls within a common area where this type of declaration will likely reside. From there, I can begin to quickly assess the contextual surrounding information. This allows me to see the configuration and from that point, either confirm the presence of, or the absence of, the expected parameter.
6/2	2026/09/19 03:49	tool	read-file	0m Args: { "File": "drivers/net/Kconfig", "FirstLine": 160, "LineCount": 35 } Results: { "Contents": " 160:\t\t 'ifb1' etc.\n 161:\t\t Look at the iproute2 documentation directory for usage etc\n 162:\t\n 163:\tsource \"drivers/net/team/Kconfig\"\n 164:\t\n 165:\tconfig MACVLAN\n 166:\t\ttristate \"MAC-VLAN support\"\n 167:\t\thelp\n 168:\t\t This allows one to create virtual interfaces that map packets to\n 169:\t\t or from specific MAC addresses to a particular interface.\n 170:\t\n 171:\t\t Macvlan devices can be added using the \"ip\" command from the\n 172:\t\t iproute2 package starting with the iproute2-2.6.23 release:\n 173:\t\n 174:\t\t \"ip link add link \u003creal dev\u003e [ address MAC ] [ NAME ] type macvlan\"\n 175:\t\n 176:\t\t To compile this driver as a module, choose M here: the module\n 177:\t\t will be called macvlan.\n 178:\t\n 179:\tconfig MACVTAP\n 180:\t\ttristate \"MAC-VLAN based tap driver\"\n 181:\t\tdepends on MACVLAN\n 182:\t\tdepends on INET\n 183:\t\tselect TAP\n 184:\t\thelp\n 185:\t\t This adds a specialized tap character device driver that is based\n 186:\t\t on the MAC-VLAN network interface, called macvtap. A macvtap device\n 187:\t\t can be added in the same way as a macvlan device, using 'type\n 188:\t\t macvtap', and then be accessed through the tap user space interface.\n 189:\t\n 190:\t\t To compile this driver as a module, choose M here: the module\n 191:\t\t will be called macvtap.\n 192:\t\n 193:\tconfig IPVLAN_L3S\n 194:\t\tdepends on NETFILTER\n" }
7/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 23202 output: 37 thoughts: 2095 Thoughts: Analyzing the MACVLAN Changes Okay, let's dive into these MACVLAN changes. First off, CONFIG_MACVLAN has no external dependencies, which simplifies things. The diff looks to be focused primarily on the passthru mode. It seems like the core changes are around how passthru mode interacts with other MACVLAN modes, especially source mode, and how the underlying device's MAC address is handled. Looking at `macvlan_addr_busy`, the checks for passthru and address changes have been removed, simplifying the logic. This suggests a direct check against the lower device's MAC, which probably means that the passthru mode now has more direct control over the address. In `macvlan_open` and `macvlan_stop`, the `macvlan_passthru` check has been replaced with a direct `vlan->mode == MACVLAN_MODE_PASSTHRU` check. This is cleaner and more explicit. Similarly, `macvlan_sync_address` gets a boolean for passthru and conditional logic. Now, if we are _not_ in passthru mode, we add the address to the device filters, which seems more straightforward. The significant changes are in `macvlan_uninit`. The code now handles restoring the lower device's MAC address when a passthru VLAN is uninitialized. The previous location to restore the lower device address to its original value was in `macvlan_port_destroy`, which was causing race conditions. This is a critical change. It appears this addresses a potential race condition or cleanup issue when a passthru interface is removed. The `macvlan_port_destroy` change suggests the lower device address restoration was moved to `macvlan_uninit`. It restores the original address after the passthru vlan is uninitialized. In `macvlan_fdb_add` and `macvlan_fdb_del`, the condition now explicitly excludes the passthru mode, indicating that FDB handling is different for passthru devices. `macvlan_common_newlink` is where things get interesting regarding passthru and source mode. Now, there are explicit checks to ensure that a passthru mode device is created first and that only one passthru device is allowed. It also seems now you cannot add a passthru device to existing source mode devices. It looks like it's enforcing a specific order or hierarchy. `macvlan_handle_frame` now expects the passthru device to be first in the list, if there is one. `macvlan_changelink` introduces checks to prevent dynamically changing the mode of a passthru interface, which makes sense. There's also a source mode flush to handle mode changes more carefully. Finally, in `macvlan_device_event`, the code now checks again if the interface mode is passthru, which is a good defensive programming approach. This is to validate the interface mode if a passthru interface is removed. Overall, these changes indicate a refinement of the passthru mode's behavior. They seem to focus on more robust MAC address management and better interaction with source mode MACVLANs. The shift of the lower device MAC restoration and the added checks for mode combinations look like the most important adjustments. Now, let me read `macvlan_handle_frame` to understand how these modes treat their packets.
8/2	2026/09/19 03:49	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 460, "LineCount": 80 } Results: { "Contents": " 460:\t\treturn consume;\n 461:\t}\n 462:\t\n 463:\t/* called under rcu_read_lock() from netif_receive_skb /\n 464:\tstatic rx_handler_result_t macvlan_handle_frame(struct sk_buff pskb)\n 465:\t{\n 466:\t\tstruct macvlan_port port;\n 467:\t\tstruct sk_buff skb = pskb;\n 468:\t\tconst struct ethhdr eth = eth_hdr(skb);\n 469:\t\tconst struct macvlan_dev vlan;\n 470:\t\tconst struct macvlan_dev src;\n 471:\t\tstruct net_device dev;\n 472:\t\tunsigned int len = 0;\n 473:\t\tint ret;\n 474:\t\trx_handler_result_t handle_res;\n 475:\t\n 476:\t\t/* Packets from dev_loopback_xmit() do not have L2 header, bail out /\n 477:\t\tif (unlikely(skb-\u003epkt_type == PACKET_LOOPBACK))\n 478:\t\t\treturn RX_HANDLER_PASS;\n 479:\t\n 480:\t\tport = macvlan_port_get_rcu(skb-\u003edev);\n 481:\t\tif (is_multicast_ether_addr(eth-\u003eh_dest)) {\n 482:\t\t\tunsigned int hash;\n 483:\t\n 484:\t\t\tskb = ip_check_defrag(dev_net(skb-\u003edev), skb, IP_DEFRAG_MACVLAN);\n 485:\t\t\tif (!skb)\n 486:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 487:\t\t\tpskb = skb;\n 488:\t\t\teth = eth_hdr(skb);\n 489:\t\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 490:\t\t\t\tkfree_skb(skb);\n 491:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 492:\t\t\t}\n 493:\t\t\tsrc = macvlan_hash_lookup(port, eth-\u003eh_source);\n 494:\t\t\tif (src) {\n 495:\t\t\t\tenum macvlan_mode mode = READ_ONCE(src-\u003emode);\n 496:\t\n 497:\t\t\t\tif (mode != MACVLAN_MODE_VEPA \u0026\u0026\n 498:\t\t\t\t mode != MACVLAN_MODE_BRIDGE) {\n 499:\t\t\t\t\t/* forward to original port. */\n 500:\t\t\t\t\tvlan = src;\n 501:\t\t\t\t\tret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:\n 502:\t\t\t\t\t __netif_rx(skb);\n 503:\t\t\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 504:\t\t\t\t\tgoto out;\n 505:\t\t\t\t}\n 506:\t\t\t}\n 507:\t\n 508:\t\t\thash = mc_hash(NULL, eth-\u003eh_dest);\n 509:\t\t\tif (test_bit(hash, port-\u003ebc_filter))\n 510:\t\t\t\tmacvlan_broadcast_enqueue(port, src, skb);\n 511:\t\t\telse if (test_bit(hash, port-\u003emc_filter))\n 512:\t\t\t\tmacvlan_multicast_rx(port, src, skb);\n 513:\t\n 514:\t\t\treturn RX_HANDLER_PASS;\n 515:\t\t}\n 516:\t\n 517:\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 518:\t\t\tkfree_skb(skb);\n 519:\t\t\treturn RX_HANDLER_CONSUMED;\n 520:\t\t}\n 521:\t\tif (macvlan_passthru(port))\n 522:\t\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\n 523:\t\t\t\t\t\t struct macvlan_dev, list);\n 524:\t\telse\n 525:\t\t\tvlan = macvlan_hash_lookup(port, eth-\u003eh_dest);\n 526:\t\tif (!vlan \|\| READ_ONCE(vlan-\u003emode) == MACVLAN_MODE_SOURCE)\n 527:\t\t\treturn RX_HANDLER_PASS;\n 528:\t\n 529:\t\tdev = vlan-\u003edev;\n 530:\t\tif (unlikely(!(dev-\u003eflags \u0026 IFF_UP))) {\n 531:\t\t\tkfree_skb(skb);\n 532:\t\t\treturn RX_HANDLER_CONSUMED;\n 533:\t\t}\n 534:\t\tlen = skb-\u003elen + ETH_HLEN;\n 535:\t\tskb = skb_share_check(skb, GFP_ATOMIC);\n 536:\t\tif (!skb) {\n 537:\t\t\tret = NET_RX_DROP;\n 538:\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 539:\t\t\tgoto out;\n" }
9/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 27402 output: 37 thoughts: 369 Thoughts: Analyzing Potential MACVLAN Passthru Device Issue Okay, let's take a look at this `macvlan_handle_frame` function. It seems pretty straightforward: if it's a passthru port, it grabs the first VLAN from the list. The recent patch changed how VLANs are added, specifically in `macvlan_common_newlink`. I see the logic now – the passthru device must be added first. It makes sense, as `macvlan_handle_frame` seems to be relying on that order. It sets the passthru flag if it’s enabled, then adds it at the head of the list. If it isn't a passthru device it is added at the tail. Now, my concern is around the uninitialization path in `macvlan_uninit`. It's removing the sources, decrementing the counter, and then… if it's a passthru VLAN, it clears the passthru flag. Okay. But… where's the `list_del_rcu(&vlan->list)` call? I don't see it explicitly removing the VLAN from the list after clearing the passthru flag. Shouldn't that be there? It could be important, but maybe there is another mechanism that deletes it? I'm going to have to dive into `macvlan.c` around `macvlan_uninit` and find out what's going on, and if I missed something in my initial assessment. I need to make sure this isn't going to cause a leak or other unexpected behavior with this passthru device.
10/2	2026/09/19 03:49	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 960, "LineCount": 45 } Results: { "Contents": " 960:\t\tnetif_inherit_tso_max(dev, lowerdev);\n 961:\t\tdev-\u003ehard_header_len\t= lowerdev-\u003ehard_header_len;\n 962:\t\tdev-\u003eneeded_headroom\t= lowerdev-\u003eneeded_headroom;\n 963:\t\tdev-\u003eneeded_tailroom\t= lowerdev-\u003eneeded_tailroom;\n 964:\t\tmacvlan_set_lockdep_class(dev);\n 965:\t\n 966:\t\tvlan-\u003epcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);\n 967:\t\tif (!vlan-\u003epcpu_stats)\n 968:\t\t\treturn -ENOMEM;\n 969:\t\n 970:\t\tport-\u003ecount += 1;\n 971:\t\n 972:\t\t/* Get macvlan's reference to lowerdev /\n 973:\t\tnetdev_hold(lowerdev, \u0026vlan-\u003edev_tracker, GFP_KERNEL);\n 974:\t\n 975:\t\treturn 0;\n 976:\t}\n 977:\t\n 978:\tstatic void macvlan_uninit(struct net_device dev)\n 979:\t{\n 980:\t\tstruct macvlan_dev vlan = netdev_priv(dev);\n 981:\t\tstruct macvlan_port port = vlan-\u003eport;\n 982:\t\n 983:\t\tfree_percpu(vlan-\u003epcpu_stats);\n 984:\t\n 985:\t\tmacvlan_flush_sources(port, vlan);\n 986:\t\tport-\u003ecount -= 1;\n 987:\t\n 988:\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n 989:\t\t\t/* If the lower device address has been changed by passthru\n 990:\t\t\t * macvlan, put it back.\n 991:\t\t\t \n 992:\t\t\t Caution: This triggers NETDEV_CHANGEADDR on\n 993:\t\t\t * the lower device. But we're in the green because\n 994:\t\t\t * the passthru interface is already off the list.\n 995:\t\t\t */\n 996:\t\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n 997:\t\t\t\tstruct sockaddr_storage ss;\n 998:\t\n 999:\t\t\t\tss.ss_family = port-\u003edev-\u003etype;\n1000:\t\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n1001:\t\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n1002:\t\t\t}\n1003:\t\t\tmacvlan_clear_passthru(port);\n1004:\t\t}\n" }
11/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 28903 output: 38 thoughts: 30 Thoughts: Here's my take on those thoughts: Analyzing `list_del` in `vlan->list` Okay, hold on a second. I need to trace the lifecycle of this VLAN structure. The core question is: where exactly is the critical removal operation, `list_del`, performed on `vlan->list`? It's essential to understand the complete link lifecycle and tear-down sequence. Since I know this code, my first instinct is that it's likely handled within `macvlan_dellink`. I need to confirm that suspicion, however, I'll start checking there.
12/2	2026/09/19 03:49	tool	grepper	0m Args: { "Expression": "list_del.vlans\|vlans", "PathPrefix": "drivers/net/macvlan.c" } Results:* { "Output": "drivers/net/macvlan.c=44=struct macvlan_port {\n--\ndrivers/net/macvlan.c-46-\tstruct hlist_head\tvlan_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c:47:\tstruct list_head\tvlans;\ndrivers/net/macvlan.c-48-\tstruct sk_buff_head\tbc_queue;\n--\ndrivers/net/macvlan.c=464=static rx_handler_result_t macvlan_handle_frame(struct sk_buff *pskb)\n--\ndrivers/net/macvlan.c-521-\tif (macvlan_passthru(port))\ndrivers/net/macvlan.c:522:\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\ndrivers/net/macvlan.c-523-\t\t\t\t\t struct macvlan_dev, list);\n--\ndrivers/net/macvlan.c=1278=static int macvlan_port_create(struct net_device dev)\n--\ndrivers/net/macvlan.c-1295-\tether_addr_copy(port-\u003eperm_addr, dev-\u003edev_addr);\ndrivers/net/macvlan.c:1296:\tINIT_LIST_HEAD(\u0026port-\u003evlans);\ndrivers/net/macvlan.c-1297-\tfor (i = 0; i \u003c MACVLAN_HASH_SIZE; i++)\n--\ndrivers/net/macvlan.c=1485=int macvlan_common_newlink(struct net_device dev,\n--\ndrivers/net/macvlan.c-1505-\ndrivers/net/macvlan.c:1506:\t/ When creating macvlans or macvtaps on top of other macvlans - use\ndrivers/net/macvlan.c-1507-\t * the real device as the lowerdev.\n--\ndrivers/net/macvlan.c-1568-\ndrivers/net/macvlan.c:1569:\t\tlist_for_each_entry(p, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1570-\t\t\tif (p-\u003emode != MACVLAN_MODE_SOURCE) {\n--\ndrivers/net/macvlan.c-1608-\t\tmacvlan_set_passthru(port);\ndrivers/net/macvlan.c:1609:\t\tlist_add_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\ndrivers/net/macvlan.c-1610-\t} else\ndrivers/net/macvlan.c:1611:\t\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\ndrivers/net/macvlan.c-1612-\tupdate_port_bc_queue_len(vlan-\u003eport);\n--\ndrivers/net/macvlan.c=1876=static void update_port_bc_queue_len(struct macvlan_port port)\n--\ndrivers/net/macvlan.c-1880-\ndrivers/net/macvlan.c:1881:\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1882-\t\tif (vlan-\u003ebc_queue_len_req \u003e max_bc_queue_len_req)\n--\ndrivers/net/macvlan.c=1888=static int macvlan_device_event(struct notifier_block unused,\n--\ndrivers/net/macvlan.c-1904-\tcase NETDEV_CHANGE:\ndrivers/net/macvlan.c:1905:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1906-\t\t\tnetif_stacked_transfer_operstate(vlan-\u003elowerdev,\n--\ndrivers/net/macvlan.c-1909-\tcase NETDEV_FEAT_CHANGE:\ndrivers/net/macvlan.c:1910:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1911-\t\t\tnetif_inherit_tso_max(vlan-\u003edev, dev);\n--\ndrivers/net/macvlan.c-1917-\tcase NETDEV_CHANGEMTU:\ndrivers/net/macvlan.c:1918:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1919-\t\t\tif (vlan-\u003edev-\u003emtu \u003c= dev-\u003emtu)\n--\ndrivers/net/macvlan.c-1927-\ndrivers/net/macvlan.c:1928:\t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\ndrivers/net/macvlan.c-1929-\t\t\t\t\t\tstruct macvlan_dev,\n--\ndrivers/net/macvlan.c-1946-\ndrivers/net/macvlan.c:1947:\t\tlist_for_each_entry_safe(vlan, next, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1948-\t\t\tvlan-\u003edev-\u003ertnl_link_ops-\u003edellink(vlan-\u003edev, \u0026list_kill);\n--\ndrivers/net/macvlan.c-1957-\tcase NETDEV_RESEND_IGMP:\ndrivers/net/macvlan.c:1958:\t\t/* Propagate to all vlans */\ndrivers/net/macvlan.c:1959:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1960-\t\t\tcall_netdevice_notifiers(event, vlan-\u003edev);\n" }
13/2	2026/09/19 03:49	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30598 output: 32 thoughts: 16 Thoughts: Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert: Tracing the Macvlan `dellink` Definition Alright, let's dive right in. My first thought is to pinpoint where the `dellink` function is defined specifically within the context of macvlan. I want the exact location of the implementation, not just vague references. This means I'm going to need to start digging into the codebase. I need to understand how the macvlan driver is structured. I need the specifics so that I can understand how this function operates in the grand scheme. My goal is clarity. I need to be able to follow the logic and understand the purpose and implications of what is happening.
14/2	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "\\.dellink", "PathPrefix": "drivers/net/macvlan.c" } Results: { "Output": "drivers/net/macvlan.c=1867=static struct rtnl_link_ops macvlan_link_ops = {\n--\ndrivers/net/macvlan.c-1870-\t.newlink\t= macvlan_newlink,\ndrivers/net/macvlan.c:1871:\t.dellink\t= macvlan_dellink,\ndrivers/net/macvlan.c-1872-\t.get_link_net\t= macvlan_get_link_net,\n" }
15/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 30944 output: 35 thoughts: 12 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it were my own internal monologue: Diving into `macvlan_dellink` Alright, let's take a look at `macvlan_dellink`. I'm immediately thinking, this is probably a utility, a script, or at least a specific code block dealing with the delinking aspect of Macvlan interfaces. Given the naming convention, it suggests a function to remove the association between a physical NIC and a virtual Macvlan interface. I'm already anticipating the typical considerations: are we talking about the simple removal of an IP address and MAC address association, or is there a more thorough unbinding involved, potentially requiring some kind of cleanup or resource release on the underlying physical interface? I need to quickly assess its scope. Does it encompass potential error handling? Is it a barebones tool or does it consider situations like a partially configured Macvlan interface, or perhaps attempts to unlink a Macvlan interface that's still actively in use. My brain is already starting to formulate questions about its implementation: Is it using `ip` commands, netlink, or a more specialized driver interface? What are the implications for network traffic? Does it gracefully handle the "down" state of the Macvlan before removing the link? I need to understand its impact on the host network stack as a whole. This is going to play into any troubleshooting I might have to do later. So, I need to see what's actually happening when this script/utility executes. What logs it produces (if any)? Does it follow established best practices? Given my experience, I can already think of scenarios where a poorly implemented "dellink" could lead to connectivity issues or even instability. So, let's see what's under the hood and make sure it's up to snuff.
16/2	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "macvlan_dellink", "PathPrefix": "drivers/net/macvlan.c" } Results: { "Output": "drivers/net/macvlan.c=1640=static int macvlan_newlink(struct net_device dev,\n--\ndrivers/net/macvlan.c-1646-\ndrivers/net/macvlan.c:1647:void macvlan_dellink(struct net_device dev, struct list_head *head)\ndrivers/net/macvlan.c-1648-{\n--\ndrivers/net/macvlan.c-1657-}\ndrivers/net/macvlan.c:1658:EXPORT_SYMBOL_GPL(macvlan_dellink);\ndrivers/net/macvlan.c-1659-\n--\ndrivers/net/macvlan.c=1867=static struct rtnl_link_ops macvlan_link_ops = {\n--\ndrivers/net/macvlan.c-1870-\t.newlink\t= macvlan_newlink,\ndrivers/net/macvlan.c:1871:\t.dellink\t= macvlan_dellink,\ndrivers/net/macvlan.c-1872-\t.get_link_net\t= macvlan_get_link_net,\n" }
17/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 31699 output: 38 thoughts: 27 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Analyzing macvlan.c: Delving into Packet Reception Okay, let's dive into the guts of `drivers/net/macvlan.c`, specifically lines 1645-1665. I'm focusing on that section because I suspect it's where the core packet reception logic for macvlan interfaces resides. I need to refresh my memory on how this driver handles incoming frames and directs them to the appropriate virtual interfaces. I anticipate this code segment will touch upon aspects like VLAN tagging, address filtering, and the crucial `netif_rx()` call. I'm particularly interested in how they've chosen to implement the packet demultiplexing, and if it's optimized for performance and scalability. I'll be looking for any potential bottlenecks or areas where they've made interesting trade-offs between complexity and efficiency. Are they using any hardware offload capabilities? And how robust is the error handling in this section? Time to dig in and see if this implementation lives up to my expectations.
18/2	2026/09/19 03:50	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 1645, "LineCount": 20 } Results: { "Contents": "1645:\t}\n1646:\t\n1647:\tvoid macvlan_dellink(struct net_device dev, struct list_head head)\n1648:\t{\n1649:\t\tstruct macvlan_dev vlan = netdev_priv(dev);\n1650:\t\n1651:\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE)\n1652:\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n1653:\t\tlist_del_rcu(\u0026vlan-\u003elist);\n1654:\t\tupdate_port_bc_queue_len(vlan-\u003eport);\n1655:\t\tunregister_netdevice_queue(dev, head);\n1656:\t\tnetdev_upper_dev_unlink(vlan-\u003elowerdev, dev);\n1657:\t}\n1658:\tEXPORT_SYMBOL_GPL(macvlan_dellink);\n1659:\t\n1660:\tstatic int macvlan_changelink(struct net_device dev,\n1661:\t\t\t\t struct nlattr tb[], struct nlattr data[],\n1662:\t\t\t\t struct netlink_ext_ack extack)\n1663:\t{\n1664:\t\tstruct macvlan_dev vlan = netdev_priv(dev);\n" }
19/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 32353 output: 38 thoughts: 469 Thoughts: My Analysis of the macvlan_uninit Process Okay, let's break down what's happening in `macvlan_uninit`. I'm starting from the unregistration of a macvlan interface. The core of this seems to be the `macvlan_dellink` function, which then calls `unregister_netdevice_queue`. Eventually, during the netdevice unregistration process, we hit `macvlan_uninit` via `dev->netdev_ops->ndo_uninit`. That makes sense; it's the cleanup stage. Inside `macvlan_uninit`, I see this conditional block related to `MACVLAN_MODE_PASSTHRU`. If we're in passthrough mode, the code is trying to restore the original MAC address of the lower device if it's been modified by the passthrough macvlan. The crucial part here is `dev_set_mac_address(port->dev, &ss, NULL)`. I instantly recognize that `dev_set_mac_address` triggers a `NETDEV_CHANGEADDR` event on the underlying device. This is where things get interesting. That `NETDEV_CHANGEADDR` event is caught by `macvlan_device_event`. When `NETDEV_CHANGEADDR` hits, the code iterates through the `vlans` list associated with the port. And then, there's `macvlan_sync_address`, which I know involves synchronization or update of the mac addresses. This is all happening during cleanup, after the macvlan interface is off the list. So, the lower device is essentially being cleaned up by restoring the mac address, which is causing a chain of events that could potentially need very careful examination. I should check how these events are handled, especially the consequences of `macvlan_sync_address`.
20/2	2026/09/19 03:50	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 1920, "LineCount": 40 } Results: { "Contents": "1920:\t\t\t\t\tcontinue;\n1921:\t\t\t\tdev_set_mtu(vlan-\u003edev, dev-\u003emtu);\n1922:\t\t\t}\n1923:\t\t\tbreak;\n1924:\t\tcase NETDEV_CHANGEADDR:\n1925:\t\t\tif (!macvlan_passthru(port))\n1926:\t\t\t\treturn NOTIFY_DONE;\n1927:\t\n1928:\t\t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\n1929:\t\t\t\t\t\t\tstruct macvlan_dev,\n1930:\t\t\t\t\t\t\tlist);\n1931:\t\t\t/* Validate the interface mode again because we're potentially\n1932:\t\t\t * triggered upon removal of the passthru interface. In which\n1933:\t\t\t * case it is already off the list (and has restored the lower\n1934:\t\t\t * device mac already).\n1935:\t\t\t /\n1936:\t\t\tif (!vlan \|\| vlan-\u003emode != MACVLAN_MODE_PASSTHRU)\n1937:\t\t\t\treturn NOTIFY_DONE;\n1938:\t\t\tif (macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n1939:\t\t\t\treturn NOTIFY_BAD;\n1940:\t\n1941:\t\t\tbreak;\n1942:\t\tcase NETDEV_UNREGISTER:\n1943:\t\t\t/ twiddle thumbs on netns device moves /\n1944:\t\t\tif (dev-\u003ereg_state != NETREG_UNREGISTERING)\n1945:\t\t\t\tbreak;\n1946:\t\n1947:\t\t\tlist_for_each_entry_safe(vlan, next, \u0026port-\u003evlans, list)\n1948:\t\t\t\tvlan-\u003edev-\u003ertnl_link_ops-\u003edellink(vlan-\u003edev, \u0026list_kill);\n1949:\t\t\tunregister_netdevice_many(\u0026list_kill);\n1950:\t\t\tbreak;\n1951:\t\tcase NETDEV_PRE_TYPE_CHANGE:\n1952:\t\t\t/ Forbid underlying device to change its type. /\n1953:\t\t\treturn NOTIFY_BAD;\n1954:\t\n1955:\t\tcase NETDEV_NOTIFY_PEERS:\n1956:\t\tcase NETDEV_BONDING_FAILOVER:\n1957:\t\tcase NETDEV_RESEND_IGMP:\n1958:\t\t\t/ Propagate to all vlans */\n1959:\t\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\n" }
21/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 33903 output: 31 thoughts: 755 Thoughts: Analyzing the `NETDEV_CHANGEADDR` Issue in macvlan and its Fuzzing Potential Okay, let's break this down. It seems there's a potential issue related to `NETDEV_CHANGEADDR` in the macvlan driver, specifically when destroying a passthru interface in conjunction with a source interface. The key is the order of operations in `macvlan_uninit`. We have `macvlan_clear_passthru(port)` happening after `dev_set_mac_address(port->dev, &ss, NULL)`. This means that during the `dev_set_mac_address` call, `macvlan_passthru(port)` is still true. Then, we hit `macvlan_device_event` and receive `NETDEV_CHANGEADDR`. The code checks `if (!macvlan_passthru(port)) return NOTIFY_DONE;`, which passes because the passthru mode hasn't been completely cleared yet. Now comes the tricky part: `vlan = list_first_entry_or_null(&port->vlans, struct macvlan_dev, list);`. Since the passthru VLAN was already removed from `port->vlans` in `macvlan_dellink`, the first entry is now the source VLAN, if one exists! So, because `vlan->mode != MACVLAN_MODE_PASSTHRU`, we get `return NOTIFY_DONE;`. Finally, `macvlan_clear_passthru(port)` is called. This whole lifecycle is a bit convoluted, with multiple calls, and a race condition is implied. The takeaway? There's a complex interaction going on here, involving lifecycle management, locking, and the underlying net device. This whole sequence has to be handled carefully. And, given that macvlan is core networking and a virtual network device accessible via syzkaller netlink descriptions (`rtnetlink`), it's a prime target for fuzzing. Now, let's see, according to the fuzzing guidelines (Section 3), the patch touches reachable executable code within core networking, which is on the list to be considered for fuzzing. Also, it involves restructuring of data structures. This seems like a slam dunk in terms of worthiness for fuzzing. My next step is to nail down the configuration requirements. We need `CONFIG_MACVLAN`. Let me quickly verify if there are any other dependencies. Checking `drivers/net/Kconfig`, I see: ``` config MACVLAN tristate "MAC-VLAN support" help This allows one to create virtual interfaces that map packets to or from specific MAC addresses to a particular interface. ... ``` No direct `depends on` clauses. Okay, looks clean from that perspective. The key thing is that it's accessible via netlink, a virtual network device driver. That makes it a good candidate.
22/2	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "menuconfig\|if NET", "PathPrefix": "drivers/net/Kconfig" } Results: { "Output": "drivers/net/Kconfig-5-\ndrivers/net/Kconfig:6:menuconfig NETDEVICES\ndrivers/net/Kconfig-7-\tdefault y if UML\n--\ndrivers/net/Kconfig-26-# that for each of the symbols.\ndrivers/net/Kconfig:27:if NETDEVICES\ndrivers/net/Kconfig-28-\n--\ndrivers/net/Kconfig=32=config NET_CORE\n--\ndrivers/net/Kconfig-38-\ndrivers/net/Kconfig:39:if NET_CORE\ndrivers/net/Kconfig-40-\n" }
23/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35496 output: 27 thoughts: 44 Thoughts: Okay, here's my take on those thoughts, framed as my own: Investigating MACVLAN Configuration Alright, let's dive in. I need to figure out if MACVLAN's conditional compilation is nested within the `if NET_CORE` block. That's a common area for networking features, so it's a logical place to start. I'm looking at line 39; yes, that's where the `if NET_CORE` directive begins. Now, MACVLAN itself appears much further down, on line 165. Hmm, that suggests it could be inside that block... but I need confirmation. I need to find the corresponding `endif` to determine the scope. I need to trace the boundaries. Where the heck is that closing directive? A quick scan should locate it.
24/2	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "endif", "PathPrefix": "drivers/net/Kconfig" } Results: { "Output": "drivers/net/Kconfig=489=config MHI_NET\n--\ndrivers/net/Kconfig-496-\ndrivers/net/Kconfig:497:endif # NET_CORE\ndrivers/net/Kconfig-498-\n--\ndrivers/net/Kconfig=621=config NET_FAILOVER\n--\ndrivers/net/Kconfig-632-\ndrivers/net/Kconfig:633:endif # NETDEVICES\n" }
25/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 35867 output: 36 thoughts: 216 Thoughts: Analyzing Networking Configuration and Identifying Focus Symbols Okay, so I'm looking at these networking configurations. It seems like `NETDEVICES` and `NET_CORE` are pretty standard, usually implied by `NET`, but it's important to list `MACVLAN` explicitly if that's relevant, or maybe just mention `MACVLAN` on its own. I should double-check that by explicitly listing `NETDEVICES`, `NET_CORE`, and `MACVLAN`. I need to be sure; does syzkaller play nice with these? The standard x86_64 defconfig seems to have `CONFIG_NETDEVICES=y` and `CONFIG_NET_CORE=y`, so definitely listing `MACVLAN` is essential here. Alright, moving on to identifying the critical symbols, the "FocusSymbols" as I like to think of them. I'm going to review the functions this patch modifies. First, there's `macvlan_clear_passthru`. Hmm, it's `static inline`, which means it won't have a distinct symbol address in the vmlinux image. Okay, noted. Next, `macvlan_addr_busy` - it's a `static bool` function. The key here is to determine if `macvlan_addr_busy` is inlined or static. That's the important piece of information I need.
26/2	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "macvlan_addr_busy", "PathPrefix": "drivers/net/macvlan.c" } Results: { "Output": "drivers/net/macvlan.c=207=static void macvlan_hash_change_addr(struct macvlan_dev vlan,\n--\ndrivers/net/macvlan.c-217-\ndrivers/net/macvlan.c:218:static bool macvlan_addr_busy(const struct macvlan_port port,\ndrivers/net/macvlan.c-219-\t\t\t const unsigned char addr)\n--\ndrivers/net/macvlan.c=638=static int macvlan_open(struct net_device dev)\n--\ndrivers/net/macvlan.c-653-\terr = -EADDRINUSE;\ndrivers/net/macvlan.c:654:\tif (macvlan_addr_busy(vlan-\u003eport, dev-\u003edev_addr))\ndrivers/net/macvlan.c-655-\t\tgoto out;\n--\ndrivers/net/macvlan.c=738=static int macvlan_sync_address(struct net_device dev,\n--\ndrivers/net/macvlan.c-752-\t\t\t/ Rehash and update the device filters /\ndrivers/net/macvlan.c:753:\t\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\ndrivers/net/macvlan.c-754-\t\t\t\t\treturn -EADDRINUSE;\n--\ndrivers/net/macvlan.c=777=static int macvlan_set_mac_address(struct net_device dev, void *p)\n--\ndrivers/net/macvlan.c-793-\ndrivers/net/macvlan.c:794:\tif (macvlan_addr_busy(vlan-\u003eport, addr-\u003e__data))\ndrivers/net/macvlan.c-795-\t\treturn -EADDRINUSE;\n" }
27/2	2026/09/19 03:50	llm	patch-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 36890 output: 264 thoughts: 1267 Thoughts: Analysis of macvlan.c Patch for Fuzzing Alright, let's break down this `macvlan.c` patch and see if it's fuzz-worthy. My first step is to quickly identify all the modified functions in the driver. I see these: `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_uninit`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_port_destroy`, `macvlan_common_newlink`, `macvlan_changelink`, and `macvlan_device_event`. Now, the question is, are any of these lifecycle hot-paths that are ubiquitous? No, these all seem specific to macvlan operations, netdev ops, link ops, event notifier, and fdb ops. Good, that narrows down the scope. I'll quickly confirm each function and its location, just to be sure: `macvlan_common_newlink`, `macvlan_changelink`, `macvlan_uninit`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_device_event`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_addr_busy`, and `macvlan_port_destroy`, all present and accounted for in `drivers/net/macvlan.c`. Okay, next I need to understand the core logic change. This patch is enabling the mixing of `MACVLAN_MODE_PASSTHRU` and `MACVLAN_MODE_SOURCE` devices on the same underlying interface. Previously, only one macvlan device was allowed in passthru mode. So, the patch seems to adjust the following: 1. `macvlan_common_newlink`: It now allows creating source mode devices when passthru exists, or passthru when only source devices are present. 2. `macvlan_changelink`: Prevents mode changes between passthru/source. 3. `macvlan_uninit`: Cleans up passthru state when the passthru device is uninitialized and restores the lower device MAC address (which fires NETDEV\_CHANGEADDR). 4. `macvlan_device_event`: Handles `NETDEV_CHANGEADDR` when passthru interface is uninit/removed. 5. `macvlan_sync_address`: Checks mode instead of port flags. 6. `macvlan_open` / `macvlan_stop`: Checks vlan mode instead of port flags for promiscuity setting. 7. `macvlan_fdb_add` / `macvlan_fdb_del`: Checks vlan mode instead of port flags for unicast filter support. These modified functions are feature-specific entry points. Now, let's see if this patch meets the fuzzing guidelines. First, reachability. Macvlan interfaces are virtual devices created via rtnetlink (`RTM_NEWLINK`), so they're fully reachable, and I can easily test this in QEMU or a standard environment. Excellent, the core logic modified here is reachable. Secondly, is it worth fuzzing? Yes, this change modifies reachable core networking virtual device driver logic and adds complex lifecycle/event handling. It's definitely worth fuzzing. The focus symbols should include the modified, non-ubiquitous functions: `macvlan_common_newlink`, `macvlan_changelink`, `macvlan_uninit`, `macvlan_sync_address`, `macvlan_device_event`, `macvlan_open`, `macvlan_stop`, `macvlan_fdb_add`, and `macvlan_fdb_del`. Finally, for enable configurations, I need `MACVLAN` (as well as `NET_CORE`, `NETDEVICES`). Everything looks good. It's well-supported, and it's testable. I'm going to set-results.
28/2	2026/09/19 03:50	tool	set-results	0m Args: { "EnableConfigs": [ "MACVLAN" ], "FocusSymbols": [ "macvlan_common_newlink", "macvlan_changelink", "macvlan_uninit", "macvlan_sync_address", "macvlan_device_event", "macvlan_open", "macvlan_stop", "macvlan_fdb_add", "macvlan_fdb_del" ], "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "MACVLAN" ], "FocusSymbols": [ "macvlan_common_newlink", "macvlan_changelink", "macvlan_uninit", "macvlan_sync_address", "macvlan_device_event", "macvlan_open", "macvlan_stop", "macvlan_fdb_add", "macvlan_fdb_del" ], "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.", "WorthFuzzing": true }
29/1	2026/09/19 03:50	action	If	1m Args: { "WorthFuzzing": true } Results: null
30/2	2026/09/19 03:50	agent	kmsan-evaluator	1m Model: core Args: null Results: { "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Instruction: You are an expert Linux kernel security engineer specializing in kernel memory error detectors (KASAN and KMSAN). Your job is to review the provided patch series and determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer) fuzzing session in addition to standard KASAN fuzzing. CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN: - Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable a comprehensive suite of debugging tools and sanitizers, including KASAN (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks. - KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap, or page allocations) and kernel-to-user memory info-leaks. Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN, LOCKDEP, OR OTHER STANDARD BUG DETECTORS. A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks that are detected ONLY by KMSAN. Look holistically at the patch series and surrounding code. Even if no direct uninitialized field accesses or new buffer allocations are added in the diff itself, a patch may alter control flow, bounds checking, or data length calculations in ways that change how the rest of the code operates on existing buffers (e.g. allowing uninitialized stack/heap memory to be read, copied to user space, or used in control flow). Do not hesitate to use your code access tools to inspect the surrounding code, called functions, and callers. Set NeedsKMSAN=true ONLY IF the patch introduces or modifies: 1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb attributes, ioctl output arguments, socket options, or BPF buffers) where fields or structure padding might not be fully initialized/zeroed. 2. Conditional logic or branching that depends on potentially uninitialized variables or struct fields. 3. Allocation or initialization of complex data structures where uninitialized fields could be read later in reachable code paths. 4. Bounds checks, lengths, or logic in a way that allows surrounding code to access uninitialized bytes of existing buffers. Set NeedsKMSAN=false IF: - The code changes primarily risk out-of-bounds access, array overflows, NULL pointer dereferences, locking deadlocks, or use-after-free bugs (these are already caught by KASAN, LOCKDEP, or standard bug detectors). - All stack/heap structures touched or introduced by the patch are fully zeroed or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied. - The patch does not introduce any risk of uninitialized memory usage or info-leaks. Use your code access tools to inspect the surrounding code if necessary, then provide detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch. Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: Target architecture: amd64 For your convenience, here is the diff of the changes: commit ae294554f8443ffab9a55f91b254932f3354f232 Author: syz-cluster <triage@syzkaller.com> Date: Sat Sep 19 03:49:24 2026 +0000 syz-cluster: applied patch under review diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index afad90b9222a2..76c11e5260334 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port port) port->flags \|= MACVLAN_F_PASSTHRU; } +static inline void macvlan_clear_passthru(struct macvlan_port port) +{ + port->flags &= ~MACVLAN_F_PASSTHRU; +} + static inline bool macvlan_addr_change(const struct macvlan_port port) { return port->flags & MACVLAN_F_ADDRCHANGE; @@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port port, * currently in use by the underlying device or * another macvlan. / - if (!macvlan_passthru(port) && !macvlan_addr_change(port) && - ether_addr_equal_64bits(port->dev->dev_addr, addr)) + if (ether_addr_equal_64bits(port->dev->dev_addr, addr)) return true; if (macvlan_hash_lookup(port, addr)) @@ -637,7 +641,7 @@ static int macvlan_open(struct net_device dev) struct net_device lowerdev = vlan->lowerdev; int err; - if (macvlan_passthru(vlan->port)) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) { err = dev_set_promiscuity(lowerdev, 1); if (err < 0) @@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device dev) dev_uc_unsync(lowerdev, dev); dev_mc_unsync(lowerdev, dev); - if (macvlan_passthru(vlan->port)) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) dev_set_promiscuity(lowerdev, -1); goto hash_del; @@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device dev, struct macvlan_dev vlan = netdev_priv(dev); struct net_device lowerdev = vlan->lowerdev; struct macvlan_port port = vlan->port; + bool passthru_dev = vlan->mode == MACVLAN_MODE_PASSTHRU; int err; if (!(dev->flags & IFF_UP)) { /* Just copy in the new address / eth_hw_addr_set(dev, addr); } else { - / Rehash and update the device filters / - if (macvlan_addr_busy(vlan->port, addr)) - return -EADDRINUSE; + if (!passthru_dev) { + / Rehash and update the device filters / + if (macvlan_addr_busy(vlan->port, addr)) + return -EADDRINUSE; - if (!macvlan_passthru(port)) { err = dev_uc_add(lowerdev, addr); if (err) return err; @@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device dev, macvlan_hash_change_addr(vlan, addr); } - if (macvlan_passthru(port) && !macvlan_addr_change(port)) { + if (passthru_dev && !macvlan_addr_change(port)) { /* Since addr_change isn't set, we are here due to lower * device change. Save the lower-dev address so we can * restore it later. @@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device dev) macvlan_flush_sources(port, vlan); port->count -= 1; - if (!port->count) + + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + / If the lower device address has been changed by passthru + * macvlan, put it back. + * + * Caution: This triggers NETDEV_CHANGEADDR on + * the lower device. But we're in the green because + * the passthru interface is already off the list. + / + if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { + struct sockaddr_storage ss; + + ss.ss_family = port->dev->type; + memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); + dev_set_mac_address(port->dev, &ss, NULL); + } + macvlan_clear_passthru(port); + } + + if (port->count == 0) macvlan_port_destroy(port->dev); } @@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg ndm, struct nlattr tb[], / Support unicast filter only on passthru devices. * Multicast filter should be allowed on all devices. / - if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr)) return -EOPNOTSUPP; if (flags & NLM_F_REPLACE) @@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg ndm, struct nlattr tb[], / Support unicast filter only on passthru devices. * Multicast filter should be allowed on all devices. / - if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr)) + if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr)) return -EOPNOTSUPP; if (is_unicast_ether_addr(addr)) @@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device dev) kfree_skb(skb); } - /* If the lower device address has been changed by passthru - * macvlan, put it back. - / - if (macvlan_passthru(port) && - !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { - struct sockaddr_storage ss; - - ss.ss_family = port->dev->type; - memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); - dev_set_mac_address(port->dev, &ss, NULL); - } - kfree(port); } @@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device dev, } port = macvlan_port_get_rtnl(lowerdev); - /* Only 1 macvlan device can be created in passthru mode / - if (macvlan_passthru(port)) { - / The macvlan port must be not created this time, - * still goto destroy_macvlan_port for readability. - / - err = -EINVAL; - goto destroy_macvlan_port; - } - vlan->lowerdev = lowerdev; vlan->dev = dev; vlan->port = port; @@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device dev, if (data && data[IFLA_MACVLAN_FLAGS]) vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); + /* Only 1 macvlan device can be created in passthru mode. There may be + * additional source mode devices but nothing else at the moment. + * + * First check if adding a source mode device to an existing passthru vlan. + / + if (macvlan_passthru(port) && vlan->mode != MACVLAN_MODE_SOURCE) { + / The macvlan port must be not created this time, + * still goto destroy_macvlan_port for readability. + / + err = -EINVAL; + goto destroy_macvlan_port; + } + + / Now check if adding a passthru device to an existing set of source mode + * devices. + / if (vlan->mode == MACVLAN_MODE_PASSTHRU) { - if (port->count) { - err = -EINVAL; - goto destroy_macvlan_port; + struct macvlan_dev p; + + list_for_each_entry(p, &port->vlans, list) { + if (p->mode != MACVLAN_MODE_SOURCE) { + err = -EINVAL; + goto destroy_macvlan_port; + } } - macvlan_set_passthru(port); eth_hw_addr_inherit(dev, lowerdev); } @@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device dev, if (err) goto unregister_netdev; - list_add_tail_rcu(&vlan->list, &port->vlans); + / macvlan_handle_frame expects the (one and only) passthru device first. / + if (vlan->mode == MACVLAN_MODE_PASSTHRU) { + macvlan_set_passthru(port); + list_add_rcu(&vlan->list, &port->vlans); + } else + list_add_tail_rcu(&vlan->list, &port->vlans); update_port_bc_queue_len(vlan->port); netif_stacked_transfer_operstate(lowerdev, dev); linkwatch_fire_event(dev); @@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device dev, if (data && data[IFLA_MACVLAN_MODE]) { set_mode = true; mode = nla_get_u32(data[IFLA_MACVLAN_MODE]); - /* Passthrough mode can't be set or cleared dynamically / - if ((mode == MACVLAN_MODE_PASSTHRU) != - (vlan->mode == MACVLAN_MODE_PASSTHRU)) - return -EINVAL; - if (vlan->mode == MACVLAN_MODE_SOURCE && - vlan->mode != mode) - macvlan_flush_sources(vlan->port, vlan); + if (mode != vlan->mode) { + / Passthrough mode can't be set or cleared dynamically, + * regardless of existing source interfaces. Furthermore, source + * interfaces can't switch modes within a passhtrough port. + / + if (vlan->mode == MACVLAN_MODE_PASSTHRU \|\| + macvlan_passthru(vlan->port)) + return -EINVAL; + if (vlan->mode == MACVLAN_MODE_SOURCE) + macvlan_flush_sources(vlan->port, vlan); + } } if (data && data[IFLA_MACVLAN_FLAGS]) { __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]); bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC; - if (macvlan_passthru(vlan->port) && promisc) { + if (vlan->mode == MACVLAN_MODE_PASSTHRU && promisc) { int err; if (flags & MACVLAN_FLAG_NOPROMISC) @@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block unused, vlan = list_first_entry_or_null(&port->vlans, struct macvlan_dev, list); - - if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr)) + /* Validate the interface mode again because we're potentially + * triggered upon removal of the passthru interface. In which + * case it is already off the list (and has restored the lower + * device mac already). + */ + if (!vlan \|\| vlan->mode != MACVLAN_MODE_PASSTHRU) + return NOTIFY_DONE; + if (macvlan_sync_address(vlan->dev, dev->dev_addr)) return NOTIFY_BAD; break;
31/3	2026/09/19 03:50	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 5508 output: 22 thoughts: 982 Thoughts: KMSAN Analysis of macvlan.c Patch Okay, let's break this down. The task is to determine if these changes in `drivers/net/macvlan.c` warrant a dedicated KMSAN fuzzing session, or if standard KASAN and other detectors are sufficient. The guiding principle is clear: if a bug can be caught by KASAN, LOCKDEP, or similar, KMSAN is not needed. KMSAN is only justified for uninitialized memory risks. First, I need to understand what this patch does. It looks like it's primarily refactoring some passthrough mode logic in macvlan, including the introduction of `macvlan_clear_passthru()`. The diff shows changes in `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, and a significant move of code in `macvlan_uninit` related to restoring the lower device's MAC address in passthrough mode. Specifically, the code that caught my attention is the moved MAC address restoration within `macvlan_uninit`. It restores the lower device's MAC address if it's been modified by the macvlan in passthrough mode: ```c if (vlan->mode == MACVLAN_MODE_PASSTHRU) { // ... if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { struct sockaddr_storage ss; ss.ss_family = port->dev->type; memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); dev_set_mac_address(port->dev, &ss, NULL); } macvlan_clear_passthru(port); } ``` Now, the `struct sockaddr_storage ss;` is the critical part. My immediate thought is, is this `ss` properly initialized? The concern is that `dev_set_mac_address` is called with this variable, and I need to ensure it's safe. While the code seems to initialize it, I need to confirm the use case with the kernel. I immediately think that `dev_set_mac_address` takes `struct sockaddr `, so I'll need to double check the implementation or callers. I will use `grepper` to search for usages and definitions to verify the expected behavior and initialization of `ss`. Based on this immediate review, I'm leaning towards potentially* needing KMSAN. The move of this code section is the key point. If uninitialized memory from `ss` could leak to `dev_set_mac_address`, then we have a classic KMSAN scenario. A false positive is a waste of time, so I will now thoroughly investigate the context and usages of `dev_set_mac_address` to eliminate any possible false positives before making my decision. I need to be sure that standard bug detectors will not catch any possible issues here.
32/3	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "int dev_set_mac_address" } Results: { "Output": "include/linux/netdevice.h=4411=int netif_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\ninclude/linux/netdevice.h-4412-\t\t\t struct netlink_ext_ack extack);\ninclude/linux/netdevice.h:4413:int dev_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\ninclude/linux/netdevice.h-4414-\t\t\tstruct netlink_ext_ack extack);\ninclude/linux/netdevice.h:4415:int dev_set_mac_address_user(struct net_device dev, struct sockaddr_storage ss,\ninclude/linux/netdevice.h-4416-\t\t\t struct netlink_ext_ack extack);\n--\nnet/core/dev_api.c=81=void dev_set_group(struct net_device dev, int new_group)\n--\nnet/core/dev_api.c-87-\nnet/core/dev_api.c:88:int dev_set_mac_address_user(struct net_device dev,\nnet/core/dev_api.c-89-\t\t\t struct sockaddr_storage ss,\n--\nnet/core/dev_api.c=321=EXPORT_SYMBOL(dev_set_allmulti);\n--\nnet/core/dev_api.c-332- /\nnet/core/dev_api.c:333:int dev_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\nnet/core/dev_api.c-334-\t\t\tstruct netlink_ext_ack extack)\n" }
33/3	2026/09/19 03:50	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 7605 output: 37 thoughts: 27 Thoughts: Here's a summary of my thought process, as requested: Diving into `dev_api.c` Alright, let's get down to brass tacks. I need to take a look at the `net/core/dev_api.c` file. Specifically, I'm zeroing in on the area around line 333. I'm going to use the `read-file` command, which is a straightforward approach. No need to overcomplicate things; I want a direct inspection of that section of code to understand what's happening. I'll be keeping an eye out for how this section relates to the larger context. This should provide the information I'm looking for.
34/3	2026/09/19 03:50	tool	read-file	0m Args: { "File": "net/core/dev_api.c", "FirstLine": 330, "LineCount": 40 } Results: { "Contents": " 330:\t \n 331:\t Return: 0 on success, -errno on failure.\n 332:\t /\n 333:\tint dev_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\n 334:\t\t\t\tstruct netlink_ext_ack extack)\n 335:\t{\n 336:\t\tint ret;\n 337:\t\n 338:\t\tnetdev_lock_ops(dev);\n 339:\t\tret = netif_set_mac_address(dev, ss, extack);\n 340:\t\tnetdev_unlock_ops(dev);\n 341:\t\n 342:\t\treturn ret;\n 343:\t}\n 344:\tEXPORT_SYMBOL(dev_set_mac_address);\n 345:\t\n 346:\tint dev_xdp_propagate(struct net_device dev, struct netdev_bpf bpf)\n 347:\t{\n 348:\t\tint ret;\n 349:\t\n 350:\t\tnetdev_lock_ops(dev);\n 351:\t\tret = netif_xdp_propagate(dev, bpf);\n 352:\t\tnetdev_unlock_ops(dev);\n 353:\t\n 354:\t\treturn ret;\n 355:\t}\n 356:\tEXPORT_SYMBOL_GPL(dev_xdp_propagate);\n 357:\t\n 358:\t/*\n 359:\t netdev_state_change() - device changes state\n 360:\t * @dev: device to cause notification\n 361:\t \n 362:\t Called to indicate a device has changed state. This function calls\n 363:\t * the notifier chains for netdev_chain and sends a NEWLINK message\n 364:\t * to the routing socket.\n 365:\t /\n 366:\tvoid netdev_state_change(struct net_device dev)\n 367:\t{\n 368:\t\tnetdev_lock_ops(dev);\n 369:\t\tnetif_state_change(dev);\n" }
35/3	2026/09/19 03:50	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8394 output: 23 thoughts: 18 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Tracing the MAC Address Assignment Okay, so I need to understand the mechanics of how a MAC address is set within this system, specifically, `netif_set_mac_address`. My initial instinct is to pinpoint the exact definition of this function. I'm going to track down the source code for `netif_set_mac_address`. This is going to give me the most granular insight into how the MAC address is being handled. I need to see if it’s a direct hardware manipulation, if there's any bridging or abstraction involved, or if any other side effects are handled within its scope. Understanding this function's internals is key to grasping the overall architecture.
36/3	2026/09/19 03:50	tool	grepper	0m Args: { "Expression": "int netif_set_mac_address" } Results: { "Output": "include/linux/netdevice.h=4409=int netif_pre_changeaddr_notify(struct net_device dev, const char addr,\ninclude/linux/netdevice.h-4410-\t\t\t\tstruct netlink_ext_ack extack);\ninclude/linux/netdevice.h:4411:int netif_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\ninclude/linux/netdevice.h-4412-\t\t\t struct netlink_ext_ack extack);\n--\nnet/core/dev.c=10033=EXPORT_SYMBOL_NS_GPL(netif_pre_changeaddr_notify, \"NETDEV_INTERNAL\");\nnet/core/dev.c-10034-\nnet/core/dev.c:10035:int netif_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\nnet/core/dev.c-10036-\t\t\t struct netlink_ext_ack *extack)\n" }
37/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 8864 output: 37 thoughts: 22 Thoughts: Here's my summary, as though I'm thinking through this process: Diving into the `net/core/dev.c` Abyss Okay, time to get to the root of this. My initial gut feeling is pointing me toward a potential issue related to network device handling, and line 10035 in `net/core/dev.c` seems like a logical place to start digging. This is where the core of the network device driver interaction lives, and that line specifically could be involved in… well, a whole host of things. I'm thinking buffer allocation, packet processing, interrupt handling – it could be anything tied to the device's operational life. Let’s get that code up and see what's actually happening at that specific point. Hopefully, the surrounding code will give me enough context to understand what’s going on and how it might be contributing to the issue at hand.
38/3	2026/09/19 03:51	tool	read-file	0m Args: { "File": "net/core/dev.c", "FirstLine": 10035, "LineCount": 50 } Results: { "Contents": "10035:\tint netif_set_mac_address(struct net_device dev, struct sockaddr_storage ss,\n10036:\t\t\t\t struct netlink_ext_ack extack)\n10037:\t{\n10038:\t\tconst struct net_device_ops ops = dev-\u003enetdev_ops;\n10039:\t\tint err;\n10040:\t\n10041:\t\tif (!ops-\u003endo_set_mac_address)\n10042:\t\t\treturn -EOPNOTSUPP;\n10043:\t\tif (ss-\u003ess_family != dev-\u003etype)\n10044:\t\t\treturn -EINVAL;\n10045:\t\tif (!netif_device_present(dev))\n10046:\t\t\treturn -ENODEV;\n10047:\t\terr = netif_pre_changeaddr_notify(dev, ss-\u003e__data, extack);\n10048:\t\tif (err)\n10049:\t\t\treturn err;\n10050:\t\tif (memcmp(dev-\u003edev_addr, ss-\u003e__data, dev-\u003eaddr_len)) {\n10051:\t\t\terr = ops-\u003endo_set_mac_address(dev, ss);\n10052:\t\t\tif (err)\n10053:\t\t\t\treturn err;\n10054:\t\t}\n10055:\t\tdev-\u003eaddr_assign_type = NET_ADDR_SET;\n10056:\t\tcall_netdevice_notifiers(NETDEV_CHANGEADDR, dev);\n10057:\t\tadd_device_randomness(dev-\u003edev_addr, dev-\u003eaddr_len);\n10058:\t\treturn 0;\n10059:\t}\n10060:\t\n10061:\tDECLARE_RWSEM(dev_addr_sem);\n10062:\t\n10063:\t/* \"sa\" is a true struct sockaddr with limited \"sa_data\" member. /\n10064:\tint netif_get_mac_address(struct sockaddr sa, struct net net, char dev_name)\n10065:\t{\n10066:\t\tsize_t size = sizeof(sa-\u003esa_data);\n10067:\t\tstruct net_device *dev;\n10068:\t\tint ret = 0;\n10069:\t\n10070:\t\tdown_read(\u0026dev_addr_sem);\n10071:\t\trcu_read_lock();\n10072:\t\n10073:\t\tdev = dev_get_by_name_rcu(net, dev_name);\n10074:\t\tif (!dev) {\n10075:\t\t\tret = -ENODEV;\n10076:\t\t\tgoto unlock;\n10077:\t\t}\n10078:\t\tif (!dev-\u003eaddr_len)\n10079:\t\t\tmemset(sa-\u003esa_data, 0, size);\n10080:\t\telse\n10081:\t\t\tmemcpy(sa-\u003esa_data, dev-\u003edev_addr,\n10082:\t\t\t min_t(size_t, size, dev-\u003eaddr_len));\n10083:\t\tsa-\u003esa_family = dev-\u003etype;\n10084:\t\n" }
39/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 9969 output: 37 thoughts: 330 Thoughts: Analyzing the `macvlan_uninit` Patch Okay, so I'm looking at this `struct sockaddr_storage ss;` in `macvlan_uninit`, and I have to ask... wait, didn't I see those exact lines somewhere else recently? Specifically, wasn't that the same block of code in `macvlan_port_destroy`? I'm pretty sure it was: ```c struct sockaddr_storage ss; ss.ss_family = port->dev->type; memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); dev_set_mac_address(port->dev, &ss, NULL); ``` Yep, there it is! The same five lines, previously existing in `macvlan_port_destroy`: ```c - if (macvlan_passthru(port) && - !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) { - struct sockaddr_storage ss; - - ss.ss_family = port->dev->type; - memcpy(&ss.__data, port->perm_addr, port->dev->addr_len); - dev_set_mac_address(port->dev, &ss, NULL); - } ``` So, this patch essentially just moved that bit of logic from `macvlan_port_destroy` into `macvlan_uninit`. The question is why? What's the rationale behind this refactoring? Time to dig into `drivers/net/macvlan.c` and get the surrounding context. I'll need to read around `macvlan_uninit` and `macvlan_common_newlink` to understand the flow and figure out what this change is trying to achieve.
40/3	2026/09/19 03:51	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 975, "LineCount": 40 } Results: { "Contents": " 975:\t\treturn 0;\n 976:\t}\n 977:\t\n 978:\tstatic void macvlan_uninit(struct net_device dev)\n 979:\t{\n 980:\t\tstruct macvlan_dev vlan = netdev_priv(dev);\n 981:\t\tstruct macvlan_port port = vlan-\u003eport;\n 982:\t\n 983:\t\tfree_percpu(vlan-\u003epcpu_stats);\n 984:\t\n 985:\t\tmacvlan_flush_sources(port, vlan);\n 986:\t\tport-\u003ecount -= 1;\n 987:\t\n 988:\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n 989:\t\t\t/ If the lower device address has been changed by passthru\n 990:\t\t\t * macvlan, put it back.\n 991:\t\t\t \n 992:\t\t\t Caution: This triggers NETDEV_CHANGEADDR on\n 993:\t\t\t * the lower device. But we're in the green because\n 994:\t\t\t * the passthru interface is already off the list.\n 995:\t\t\t /\n 996:\t\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n 997:\t\t\t\tstruct sockaddr_storage ss;\n 998:\t\n 999:\t\t\t\tss.ss_family = port-\u003edev-\u003etype;\n1000:\t\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n1001:\t\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n1002:\t\t\t}\n1003:\t\t\tmacvlan_clear_passthru(port);\n1004:\t\t}\n1005:\t\n1006:\t\tif (port-\u003ecount == 0)\n1007:\t\t\tmacvlan_port_destroy(port-\u003edev);\n1008:\t}\n1009:\t\n1010:\tstatic void macvlan_dev_get_stats64(struct net_device dev,\n1011:\t\t\t\t\t struct rtnl_link_stats64 stats)\n1012:\t{\n1013:\t\tstruct macvlan_dev vlan = netdev_priv(dev);\n1014:\t\n" }
41/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 11377 output: 21 thoughts: 1261 Thoughts: Analyzing the Macvlan Patch for Passthru and Source Mode Combinations Okay, let's break this down. First, I'm seeing that this patch fundamentally changes how passthru mode interacts with other macvlan modes. Previously, it was strictly one or the other on a port. You could have a passthru macvlan or multiple source mode macvlans, but never both simultaneously. The key here is the exclusivity – if `macvlan_passthru(port)` was set, no other macvlan device could exist, and if `port->count` wasn't zero, no passthru mode. Now, we're combining them. The change allows for a single PASSTHRU macvlan alongside multiple SOURCE mode macvlans. This impacts how the port's destruction is handled. Previously, destroying the passthru device would destroy the port (`port->count == 0`), but now, source mode devices might keep the `port->count` > 0, so the port is not destroyed. So, `macvlan_uninit` has been updated to restore the lowerdev MAC and clear `MACVLAN_F_PASSTHRU` if the device being uninitialized is PASSTHRU. Looking at the code, in `macvlan_addr_busy`, the logic has been simplified because the check for `!macvlan_passthru(port)` is no longer relevant, given the change. And in `macvlan_device_event`, the new logic ensures that the address synchronization only occurs if a PASSTHRU macvlan exists. Now, my concern is whether any memory could be left uninitialized or read uninitialized. Specifically, I'm focusing on the introduction of the new `struct sockaddr_storage ss;`. Wait a minute, I see that this was NOT new. That structure was already used in `macvlan_port_destroy`, used in the exact same manner. Okay, let's step back. Does `dev_set_mac_address` read uninitialized memory from `ss`? I have to dive deeper. `netif_set_mac_address`, calls `ops->ndo_set_mac_address`. The usual pattern here is that the MAC address is actually located at the start of `ss->__data`. My grep confirms that `ndo_set_mac_address` receives a `void ` or `struct sockaddr `. So it looks like everything is in order.
42/3	2026/09/19 03:51	tool	grepper	0m Args: { "Expression": "int eth_mac_addr\\(" } Results: { "Output": "include/linux/etherdevice.h=53=void eth_commit_mac_addr_change(struct net_device dev, void p);\ninclude/linux/etherdevice.h:54:int eth_mac_addr(struct net_device dev, void p);\ninclude/linux/etherdevice.h-55-int eth_validate_addr(struct net_device dev);\n--\nnet/ethernet/eth.c=295=EXPORT_SYMBOL(eth_commit_mac_addr_change);\n--\nnet/ethernet/eth.c-306- /\nnet/ethernet/eth.c:307:int eth_mac_addr(struct net_device dev, void p)\nnet/ethernet/eth.c-308-{\n" }
43/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 13387 output: 36 thoughts: 20 Thoughts: Here's my summary, as though I were thinking through the process: Diving into the Ethernet Implementation Okay, so I need to get to the bottom of this. Time to dig into the kernel's Ethernet implementation. I remember seeing something peculiar the other day, and now's the time to refresh my memory and understand it thoroughly. Let me start by focusing on `net/ethernet/eth.c`. My instinct tells me that the issue might be related to the core handling of Ethernet frames, so this seems like a solid place to begin my investigation. Specifically, I should check out line 307. That's a reasonable starting point. Let's see what's happening there and see if it makes me think in new directions.
44/3	2026/09/19 03:51	tool	read-file	0m Args: { "File": "net/ethernet/eth.c", "FirstLine": 305, "LineCount": 25 } Results: { "Contents": " 305:\t * for most real devices.\n 306:\t /\n 307:\tint eth_mac_addr(struct net_device dev, void p)\n 308:\t{\n 309:\t\tint ret;\n 310:\t\n 311:\t\tret = eth_prepare_mac_addr_change(dev, p);\n 312:\t\tif (ret \u003c 0)\n 313:\t\t\treturn ret;\n 314:\t\teth_commit_mac_addr_change(dev, p);\n 315:\t\treturn 0;\n 316:\t}\n 317:\tEXPORT_SYMBOL(eth_mac_addr);\n 318:\t\n 319:\tint eth_validate_addr(struct net_device dev)\n 320:\t{\n 321:\t\tif (!is_valid_ether_addr(dev-\u003edev_addr))\n 322:\t\t\treturn -EADDRNOTAVAIL;\n 323:\t\n 324:\t\treturn 0;\n 325:\t}\n 326:\tEXPORT_SYMBOL(eth_validate_addr);\n 327:\t\n 328:\tconst struct header_ops eth_header_ops ____cacheline_aligned = {\n 329:\t\t.create\t\t= eth_header,\n" }
45/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 13954 output: 24 thoughts: 18 Thoughts: Okay, let's dive into this `eth_prepare_mac_addr_change` function. I'm going to quickly get a high-level understanding of its purpose and how it's intended to work. I already know this area, so let's cut to the chase and understand where this fits into the broader picture.
46/3	2026/09/19 03:51	tool	grepper	0m Args: { "Expression": "int eth_prepare_mac_addr_change" } Results: { "Output": "include/linux/etherdevice.h=51=__be16 eth_header_parse_protocol(const struct sk_buff skb);\ninclude/linux/etherdevice.h:52:int eth_prepare_mac_addr_change(struct net_device dev, void p);\ninclude/linux/etherdevice.h-53-void eth_commit_mac_addr_change(struct net_device dev, void p);\n--\nnet/ethernet/eth.c=265=EXPORT_SYMBOL(eth_header_parse_protocol);\n--\nnet/ethernet/eth.c-271- /\nnet/ethernet/eth.c:272:int eth_prepare_mac_addr_change(struct net_device dev, void p)\nnet/ethernet/eth.c-273-{\n" }
47/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 14277 output: 36 thoughts: 20 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: Diving into the Ethernet Driver Okay, time to dig into the guts of the Ethernet driver. Specifically, I'm heading over to `net/ethernet/eth.c` and zeroing in on line 272. That line number usually points me to some key function or data structure, depending on the particular driver architecture. This is a common location for handling frame reception, transmission setup, or potentially even some crucial register configuration based on my past experience with similar drivers. The context around that line will be crucial, so I'll be sure to parse a few lines above and below to form a complete understanding. Hopefully, the surrounding code provides enough clues to work with the line-272 functionality.
48/3	2026/09/19 03:51	tool	read-file	0m Args: { "File": "net/ethernet/eth.c", "FirstLine": 272, "LineCount": 25 } Results: { "Contents": " 272:\tint eth_prepare_mac_addr_change(struct net_device dev, void p)\n 273:\t{\n 274:\t\tstruct sockaddr addr = p;\n 275:\t\n 276:\t\tif (!(dev-\u003epriv_flags \u0026 IFF_LIVE_ADDR_CHANGE) \u0026\u0026 netif_running(dev))\n 277:\t\t\treturn -EBUSY;\n 278:\t\tif (!is_valid_ether_addr(addr-\u003esa_data))\n 279:\t\t\treturn -EADDRNOTAVAIL;\n 280:\t\treturn 0;\n 281:\t}\n 282:\tEXPORT_SYMBOL(eth_prepare_mac_addr_change);\n 283:\t\n 284:\t/\n 285:\t eth_commit_mac_addr_change - commit mac change\n 286:\t * @dev: network device\n 287:\t * @p: socket address\n 288:\t /\n 289:\tvoid eth_commit_mac_addr_change(struct net_device dev, void p)\n 290:\t{\n 291:\t\tstruct sockaddr addr = p;\n 292:\t\n 293:\t\teth_hw_addr_set(dev, addr-\u003esa_data);\n 294:\t}\n 295:\tEXPORT_SYMBOL(eth_commit_mac_addr_change);\n 296:\t\n" }
49/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 14882 output: 36 thoughts: 2728 Thoughts: Analyzing the MacVLAN Patch: A Deep Dive Okay, here's my breakdown of this patch. Seems like we're refining the MacVLAN code, specifically around the interaction between passthru and other modes. Let's walk through it. First, the initialization code. The `ss.ss_family` and `ss.__data` initialization and usage is straightforward. It was already there and I don't see anything unusual, and it was just moved. Now, the core changes. The introduction of `MACVLAN_F_PASSTHRU` flags with the `macvlan_set_passthru` and `macvlan_clear_passthru` functions looks like a clean way to manage the passthru state. The `macvlan_addr_busy` function is updated, and it is a little more robust now. The initial conditional check related to the device address has been removed. The real meat of this change seems to be the careful handling of the `MACVLAN_MODE_PASSTHRU` mode. Replacing `macvlan_passthru(vlan->port)` with `vlan->mode == MACVLAN_MODE_PASSTHRU` in `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_fdb_add` and `macvlan_fdb_del` is crucial. It ensures that operations specific to passthru mode are only performed by the passthru device itself and it avoids unintentionally modifying the behavior of source devices sharing the same port. Also, it ensures the behaviour is only applied to the passthru device. In `macvlan_sync_address`, the use of `passthru_dev` to gate logic within `macvlan_sync_address` based on the device's mode is spot on. This prevents unnecessary re-hashing and address updates on the lower device for source mode devices. In the `macvlan_uninit` function we have an important safeguard. If the lower device address has been changed by passthru, it's restored upon uninitialization. That's good. The `macvlan_common_newlink` changes are significant. We're now explicitly allowing multiple devices on a passthru port, but with clear restrictions: one passthru device and multiple source mode devices. The checks for `vlan->mode` and existing devices ensure we maintain this structure. And the ordering of `list_add_rcu` is interesting, ensuring the passthru device is at the head. The restrictions in `macvlan_changelink` on mode changes make sense. Passthru mode can't be set or cleared dynamically, and a source interface cannot change its mode within a passthru port. That keeps things predictable. The `macvlan_device_event` changes also make sense, the validation of the interface mode is critical here. It adds robustness by confirming the device's mode before attempting any action in the unlikely event the passthru interface is already removed. Finally, in `macvlan_handle_frame`, we're likely making sure that passthru frames and source mode frames are properly handled. However, I can't be sure about this until I read the code. But given the rest of the changes, I'm expecting proper handling. Overall, this patch looks like a well-thought-out improvement to the MacVLAN implementation, allowing for a more flexible and robust setup with multiple devices on a passthru port while preserving the intended behavior of the system.
50/3	2026/09/19 03:51	tool	grepper	0m Args: { "Expression": "macvlan_handle_frame", "PathPrefix": "drivers/net/macvlan.c" } Results: { "Output": "drivers/net/macvlan.c=438=static bool macvlan_forward_source(struct sk_buff skb,\n--\ndrivers/net/macvlan.c-463-/ called under rcu_read_lock() from netif_receive_skb /\ndrivers/net/macvlan.c:464:static rx_handler_result_t macvlan_handle_frame(struct sk_buff pskb)\ndrivers/net/macvlan.c-465-{\n--\ndrivers/net/macvlan.c=1278=static int macvlan_port_create(struct net_device dev)\n--\ndrivers/net/macvlan.c-1306-\ndrivers/net/macvlan.c:1307:\terr = netdev_rx_handler_register(dev, macvlan_handle_frame, port);\ndrivers/net/macvlan.c-1308-\tif (err)\n--\ndrivers/net/macvlan.c=1485=int macvlan_common_newlink(struct net_device dev,\n--\ndrivers/net/macvlan.c-1605-\ndrivers/net/macvlan.c:1606:\t/ macvlan_handle_frame expects the (one and only) passthru device first. */\ndrivers/net/macvlan.c-1607-\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n" }
51/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 18800 output: 37 thoughts: 25 Thoughts: Okay, let's dive into this. I'm going to pull up `drivers/net/macvlan.c` and specifically focus on the `macvlan_handle_frame` function. I know this is where the core logic for handling incoming frames in a Macvlan environment resides. I'm expecting this to be the central point where the kernel decides how to route and process traffic that arrives on the physical interface but is destined for one of the virtual interfaces. I'll be looking for how it determines the intended destination, whether it's checking MAC addresses, VLAN tags, or some other identifier. I'll also be trying to understand how it interacts with the lower network stack and how it decides whether to forward the frame upwards, drop it, or inject it into another Macvlan interface. I'm keen to see if there are any specific optimizations or quirks for different frame types or network protocols. This is where the rubber meets the road, so let's see what's actually happening at the packet level.
52/3	2026/09/19 03:51	tool	read-file	0m Args: { "File": "drivers/net/macvlan.c", "FirstLine": 463, "LineCount": 70 } Results: { "Contents": " 463:\t/* called under rcu_read_lock() from netif_receive_skb /\n 464:\tstatic rx_handler_result_t macvlan_handle_frame(struct sk_buff pskb)\n 465:\t{\n 466:\t\tstruct macvlan_port port;\n 467:\t\tstruct sk_buff skb = pskb;\n 468:\t\tconst struct ethhdr eth = eth_hdr(skb);\n 469:\t\tconst struct macvlan_dev vlan;\n 470:\t\tconst struct macvlan_dev src;\n 471:\t\tstruct net_device dev;\n 472:\t\tunsigned int len = 0;\n 473:\t\tint ret;\n 474:\t\trx_handler_result_t handle_res;\n 475:\t\n 476:\t\t/* Packets from dev_loopback_xmit() do not have L2 header, bail out /\n 477:\t\tif (unlikely(skb-\u003epkt_type == PACKET_LOOPBACK))\n 478:\t\t\treturn RX_HANDLER_PASS;\n 479:\t\n 480:\t\tport = macvlan_port_get_rcu(skb-\u003edev);\n 481:\t\tif (is_multicast_ether_addr(eth-\u003eh_dest)) {\n 482:\t\t\tunsigned int hash;\n 483:\t\n 484:\t\t\tskb = ip_check_defrag(dev_net(skb-\u003edev), skb, IP_DEFRAG_MACVLAN);\n 485:\t\t\tif (!skb)\n 486:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 487:\t\t\tpskb = skb;\n 488:\t\t\teth = eth_hdr(skb);\n 489:\t\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 490:\t\t\t\tkfree_skb(skb);\n 491:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 492:\t\t\t}\n 493:\t\t\tsrc = macvlan_hash_lookup(port, eth-\u003eh_source);\n 494:\t\t\tif (src) {\n 495:\t\t\t\tenum macvlan_mode mode = READ_ONCE(src-\u003emode);\n 496:\t\n 497:\t\t\t\tif (mode != MACVLAN_MODE_VEPA \u0026\u0026\n 498:\t\t\t\t mode != MACVLAN_MODE_BRIDGE) {\n 499:\t\t\t\t\t/* forward to original port. */\n 500:\t\t\t\t\tvlan = src;\n 501:\t\t\t\t\tret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:\n 502:\t\t\t\t\t __netif_rx(skb);\n 503:\t\t\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 504:\t\t\t\t\tgoto out;\n 505:\t\t\t\t}\n 506:\t\t\t}\n 507:\t\n 508:\t\t\thash = mc_hash(NULL, eth-\u003eh_dest);\n 509:\t\t\tif (test_bit(hash, port-\u003ebc_filter))\n 510:\t\t\t\tmacvlan_broadcast_enqueue(port, src, skb);\n 511:\t\t\telse if (test_bit(hash, port-\u003emc_filter))\n 512:\t\t\t\tmacvlan_multicast_rx(port, src, skb);\n 513:\t\n 514:\t\t\treturn RX_HANDLER_PASS;\n 515:\t\t}\n 516:\t\n 517:\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 518:\t\t\tkfree_skb(skb);\n 519:\t\t\treturn RX_HANDLER_CONSUMED;\n 520:\t\t}\n 521:\t\tif (macvlan_passthru(port))\n 522:\t\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\n 523:\t\t\t\t\t\t struct macvlan_dev, list);\n 524:\t\telse\n 525:\t\t\tvlan = macvlan_hash_lookup(port, eth-\u003eh_dest);\n 526:\t\tif (!vlan \|\| READ_ONCE(vlan-\u003emode) == MACVLAN_MODE_SOURCE)\n 527:\t\t\treturn RX_HANDLER_PASS;\n 528:\t\n 529:\t\tdev = vlan-\u003edev;\n 530:\t\tif (unlikely(!(dev-\u003eflags \u0026 IFF_UP))) {\n 531:\t\t\tkfree_skb(skb);\n 532:\t\t\treturn RX_HANDLER_CONSUMED;\n" }
53/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 20274 output: 36 thoughts: 385 Thoughts: My Analysis of the Macvlan Patch Okay, here's what I'm seeing. Line 521 is where the decision is made about how a MACVLAN device handles a received frame, specifically based on whether the device is in "passthru" mode or not. That choice directly influences how it looks up the associated VLAN. The `macvlan_passthru()` function and the VLAN lookup logic are the core of this section. It’s all about the interplay between `port->vlans` (likely a list of VLAN devices attached to a physical port) and the frame's destination MAC address. Importantly, the code checks the `vlan->mode` and skips the frame if it's `MACVLAN_MODE_SOURCE`. Looking back at `macvlan_common_newlink`, the code decides on how to insert the vlan into the list, depending on the `MACVLAN_MODE`. If it's `PASSTHRU`, it's added at the head of the list, otherwise it goes to the tail. It’s clear this part of the code is responsible for initializing and configuring new MACVLAN links, ensuring that the "passthru" device, if it exists, is prioritized within the list. These actions are directly tied to network device configuration, link management, list insertion order, various flags, promiscuity, and the critical role of RTNL (Routing Table Netlink) notifications. Now, I need to consider KMSAN (Kernel Memory Sanitizer) and potential uninitialized memory exposures. The key here is whether this patch introduces any data that’s communicated to userspace. I've got to scrutinize any interactions between kernel structures and userspace applications. Are we modifying any structures that are ultimately exposed via `copy_to_user`, `put_user`, netlink SKB attributes, ioctl output arguments, socket options, or BPF buffers? I need to look for calls to `fill_info` functions or anything that manipulates netlink attributes, as these are common ways for kernel data to leak to userspace. I'll need to check if `macvlan_fill_info` is being modified. That would be a good place to start.
54/3	2026/09/19 03:51	tool	grepper	0m Args: { "Expression": "macvlan_fill_info", "PathPrefix": "drivers/net/macvlan.c" } Results: { "Output": "drivers/net/macvlan.c=1744=static size_t macvlan_get_size(const struct net_device dev)\n--\ndrivers/net/macvlan.c-1758-\ndrivers/net/macvlan.c:1759:static int macvlan_fill_info_macaddr(struct sk_buff skb,\ndrivers/net/macvlan.c-1760-\t\t\t\t const struct macvlan_dev vlan,\n--\ndrivers/net/macvlan.c-1776-\ndrivers/net/macvlan.c:1777:static int macvlan_fill_info(struct sk_buff skb,\ndrivers/net/macvlan.c-1778-\t\t\t\tconst struct net_device dev)\n--\ndrivers/net/macvlan.c-1802-\t\tfor (i = 0; i \u003c MACVLAN_HASH_SIZE; i++) {\ndrivers/net/macvlan.c:1803:\t\t\tcnt = macvlan_fill_info_macaddr(skb, vlan, i);\ndrivers/net/macvlan.c-1804-\t\t\tif (cnt \u003c 0)\n--\ndrivers/net/macvlan.c=1848=int macvlan_link_register(struct rtnl_link_ops ops)\n--\ndrivers/net/macvlan.c-1855-\tops-\u003eget_size\t\t= macvlan_get_size;\ndrivers/net/macvlan.c:1856:\tops-\u003efill_info\t\t= macvlan_fill_info;\ndrivers/net/macvlan.c-1857-\n" }
55/3	2026/09/19 03:51	llm	kmsan-evaluator	0m Model: gemini-3.8-flash Args: null Results: null Tokens: input: 21595 output: 426 thoughts: 1078 Thoughts: KMSAN Assessment: No Need for Dedicated Session Okay, let's break this down. First, I noticed that `macvlan_fill_info` wasn't touched by this patch, so we can set that aside. My focus is on potentially uninitialized memory reads. Checking the code, I see a few areas. In `macvlan_clear_passthru`, `port` is passed in, and `port->flags` are manipulated. In `macvlan_sync_address`, a boolean `passthru_dev` is initialized, which is good. `macvlan_uninit` has a `struct sockaddr_storage ss`, but it's only used if the MAC addresses don't match, and the code looks identical to what was previously in `macvlan_port_destroy`. `macvlan_common_newlink` has a loop cursor, and `macvlan_changelink` and `macvlan_device_event` now have updated conditionals. Critically, there are no new allocations introduced. I'm not changing any packet buffer bounds or parsing logic. Now, let's consider the risks. I'm thinking about passthru devices and source mode devices co-existing. How are frames handled in that situation? The list manipulation with `list_add_rcu` vs `list_add_tail_rcu` is something to look at. The event notification when the lower device MAC address is restored is also important. I need to make sure this doesn't create any kind of recursion or locking issue. I can't be sure this is correct. There is a big comment related to this: `Caution: This triggers NETDEV_CHANGEADDR on the lower device. But we're in the green because the passthru interface is already off the list.` I'm concerned about race conditions, locking, RTNL requirements, and potential use-after-free or list corruption if links are created or removed concurrently. But, and this is the key point, any of those potential bugs – deadlocks, list corruption, UAF, NULL deref – should be caught by KASAN, LOCKDEP, and the standard kernel debugging tools. Not KMSAN. The rule is clear: If a bug can be caught by KASAN, LOCKDEP, or standard bug detectors, there is no need for KMSAN. I only need KMSAN if there are uninitialized memory risks that are only detected by KMSAN. So, let me summarize: The patch allows for passthru macvlan devices and source mode macvlan devices to co-exist. It modifies mode checks, handles MAC address restoration in `uninit` rather than `port_destroy`, and orders the list for passthru devices. No new data structures, memory allocations, or copies to userspace are introduced. The `struct sockaddr_storage ss` in `macvlan_uninit` is a verbatim move from `macvlan_port_destroy` and passes type and permanent MAC address to `dev_set_mac_address`. Potential bugs relate to link state, list traversal/RCU synchronization, or notifier recursion, which are covered by existing detectors. Therefore, there are no uninitialized memory access risks. I'm confident we can set `NeedsKMSAN=false`. Let's call `set-results`.
56/3	2026/09/19 03:52	tool	set-results	0m Args: { "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false } Results: { "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.", "NeedsKMSAN": false }

{
  "EnableConfigs": [
    "MACVLAN"
  ],
  "FocusSymbols": [
    "macvlan_common_newlink",
    "macvlan_changelink",
    "macvlan_uninit",
    "macvlan_sync_address",
    "macvlan_device_event",
    "macvlan_open",
    "macvlan_stop",
    "macvlan_fdb_add",
    "macvlan_fdb_del"
  ],
  "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit ae294554f8443ffab9a55f91b254932f3354f232\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Sep 19 03:49:24 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c\nindex afad90b9222a2..76c11e5260334 100644\n--- a/drivers/net/macvlan.c\n+++ b/drivers/net/macvlan.c\n@@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port *port)\n \tport-\u003eflags |= MACVLAN_F_PASSTHRU;\n }\n \n+static inline void macvlan_clear_passthru(struct macvlan_port *port)\n+{\n+\tport-\u003eflags \u0026= ~MACVLAN_F_PASSTHRU;\n+}\n+\n static inline bool macvlan_addr_change(const struct macvlan_port *port)\n {\n \treturn port-\u003eflags \u0026 MACVLAN_F_ADDRCHANGE;\n@@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port *port,\n \t * currently in use by the underlying device or\n \t * another macvlan.\n \t */\n-\tif (!macvlan_passthru(port) \u0026\u0026 !macvlan_addr_change(port) \u0026\u0026\n-\t    ether_addr_equal_64bits(port-\u003edev-\u003edev_addr, addr))\n+\tif (ether_addr_equal_64bits(port-\u003edev-\u003edev_addr, addr))\n \t\treturn true;\n \n \tif (macvlan_hash_lookup(port, addr))\n@@ -637,7 +641,7 @@ static int macvlan_open(struct net_device *dev)\n \tstruct net_device *lowerdev = vlan-\u003elowerdev;\n \tint err;\n \n-\tif (macvlan_passthru(vlan-\u003eport)) {\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n \t\tif (!(vlan-\u003eflags \u0026 MACVLAN_FLAG_NOPROMISC)) {\n \t\t\terr = dev_set_promiscuity(lowerdev, 1);\n \t\t\tif (err \u003c 0)\n@@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device *dev)\n \tdev_uc_unsync(lowerdev, dev);\n \tdev_mc_unsync(lowerdev, dev);\n \n-\tif (macvlan_passthru(vlan-\u003eport)) {\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n \t\tif (!(vlan-\u003eflags \u0026 MACVLAN_FLAG_NOPROMISC))\n \t\t\tdev_set_promiscuity(lowerdev, -1);\n \t\tgoto hash_del;\n@@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device *dev,\n \tstruct macvlan_dev *vlan = netdev_priv(dev);\n \tstruct net_device *lowerdev = vlan-\u003elowerdev;\n \tstruct macvlan_port *port = vlan-\u003eport;\n+\tbool passthru_dev = vlan-\u003emode == MACVLAN_MODE_PASSTHRU;\n \tint err;\n \n \tif (!(dev-\u003eflags \u0026 IFF_UP)) {\n \t\t/* Just copy in the new address */\n \t\teth_hw_addr_set(dev, addr);\n \t} else {\n-\t\t/* Rehash and update the device filters */\n-\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\n-\t\t\treturn -EADDRINUSE;\n+\t\tif (!passthru_dev) {\n+\t\t\t/* Rehash and update the device filters */\n+\t\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\n+\t\t\t\t\treturn -EADDRINUSE;\n \n-\t\tif (!macvlan_passthru(port)) {\n \t\t\terr = dev_uc_add(lowerdev, addr);\n \t\t\tif (err)\n \t\t\t\treturn err;\n@@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device *dev,\n \n \t\tmacvlan_hash_change_addr(vlan, addr);\n \t}\n-\tif (macvlan_passthru(port) \u0026\u0026 !macvlan_addr_change(port)) {\n+\tif (passthru_dev \u0026\u0026 !macvlan_addr_change(port)) {\n \t\t/* Since addr_change isn't set, we are here due to lower\n \t\t * device change.  Save the lower-dev address so we can\n \t\t * restore it later.\n@@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device *dev)\n \n \tmacvlan_flush_sources(port, vlan);\n \tport-\u003ecount -= 1;\n-\tif (!port-\u003ecount)\n+\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n+\t\t/* If the lower device address has been changed by passthru\n+\t\t * macvlan, put it back.\n+\t\t *\n+\t\t * Caution: This triggers NETDEV_CHANGEADDR on\n+\t\t * the lower device. But we're in the green because\n+\t\t * the passthru interface is already off the list.\n+\t\t */\n+\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n+\t\t\tstruct sockaddr_storage ss;\n+\n+\t\t\tss.ss_family = port-\u003edev-\u003etype;\n+\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n+\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n+\t\t}\n+\t\tmacvlan_clear_passthru(port);\n+\t}\n+\n+\tif (port-\u003ecount == 0)\n \t\tmacvlan_port_destroy(port-\u003edev);\n }\n \n@@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],\n \t/* Support unicast filter only on passthru devices.\n \t * Multicast filter should be allowed on all devices.\n \t */\n-\tif (!macvlan_passthru(vlan-\u003eport) \u0026\u0026 is_unicast_ether_addr(addr))\n+\tif (vlan-\u003emode != MACVLAN_MODE_PASSTHRU \u0026\u0026 is_unicast_ether_addr(addr))\n \t\treturn -EOPNOTSUPP;\n \n \tif (flags \u0026 NLM_F_REPLACE)\n@@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],\n \t/* Support unicast filter only on passthru devices.\n \t * Multicast filter should be allowed on all devices.\n \t */\n-\tif (!macvlan_passthru(vlan-\u003eport) \u0026\u0026 is_unicast_ether_addr(addr))\n+\tif (vlan-\u003emode != MACVLAN_MODE_PASSTHRU \u0026\u0026 is_unicast_ether_addr(addr))\n \t\treturn -EOPNOTSUPP;\n \n \tif (is_unicast_ether_addr(addr))\n@@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device *dev)\n \t\tkfree_skb(skb);\n \t}\n \n-\t/* If the lower device address has been changed by passthru\n-\t * macvlan, put it back.\n-\t */\n-\tif (macvlan_passthru(port) \u0026\u0026\n-\t    !ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n-\t\tstruct sockaddr_storage ss;\n-\n-\t\tss.ss_family = port-\u003edev-\u003etype;\n-\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n-\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n-\t}\n-\n \tkfree(port);\n }\n \n@@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device *dev,\n \t}\n \tport = macvlan_port_get_rtnl(lowerdev);\n \n-\t/* Only 1 macvlan device can be created in passthru mode */\n-\tif (macvlan_passthru(port)) {\n-\t\t/* The macvlan port must be not created this time,\n-\t\t * still goto destroy_macvlan_port for readability.\n-\t\t */\n-\t\terr = -EINVAL;\n-\t\tgoto destroy_macvlan_port;\n-\t}\n-\n \tvlan-\u003elowerdev = lowerdev;\n \tvlan-\u003edev      = dev;\n \tvlan-\u003eport     = port;\n@@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device *dev,\n \tif (data \u0026\u0026 data[IFLA_MACVLAN_FLAGS])\n \t\tvlan-\u003eflags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);\n \n+\t/* Only 1 macvlan device can be created in passthru mode. There may be\n+\t * additional source mode devices but nothing else at the moment.\n+\t *\n+\t * First check if adding a source mode device to an existing passthru vlan.\n+\t */\n+\tif (macvlan_passthru(port) \u0026\u0026 vlan-\u003emode != MACVLAN_MODE_SOURCE) {\n+\t\t/* The macvlan port must be not created this time,\n+\t\t * still goto destroy_macvlan_port for readability.\n+\t\t */\n+\t\terr = -EINVAL;\n+\t\tgoto destroy_macvlan_port;\n+\t}\n+\n+\t/* Now check if adding a passthru device to an existing set of source mode\n+\t * devices.\n+\t */\n \tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n-\t\tif (port-\u003ecount) {\n-\t\t\terr = -EINVAL;\n-\t\t\tgoto destroy_macvlan_port;\n+\t\tstruct macvlan_dev *p;\n+\n+\t\tlist_for_each_entry(p, \u0026port-\u003evlans, list) {\n+\t\t\tif (p-\u003emode != MACVLAN_MODE_SOURCE) {\n+\t\t\t\terr = -EINVAL;\n+\t\t\t\tgoto destroy_macvlan_port;\n+\t\t\t}\n \t\t}\n-\t\tmacvlan_set_passthru(port);\n \t\teth_hw_addr_inherit(dev, lowerdev);\n \t}\n \n@@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device *dev,\n \tif (err)\n \t\tgoto unregister_netdev;\n \n-\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n+\t/* macvlan_handle_frame expects the (one and only) passthru device first. */\n+\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n+\t\tmacvlan_set_passthru(port);\n+\t\tlist_add_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n+\t} else\n+\t\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\n \tupdate_port_bc_queue_len(vlan-\u003eport);\n \tnetif_stacked_transfer_operstate(lowerdev, dev);\n \tlinkwatch_fire_event(dev);\n@@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device *dev,\n \tif (data \u0026\u0026 data[IFLA_MACVLAN_MODE]) {\n \t\tset_mode = true;\n \t\tmode = nla_get_u32(data[IFLA_MACVLAN_MODE]);\n-\t\t/* Passthrough mode can't be set or cleared dynamically */\n-\t\tif ((mode == MACVLAN_MODE_PASSTHRU) !=\n-\t\t    (vlan-\u003emode == MACVLAN_MODE_PASSTHRU))\n-\t\t\treturn -EINVAL;\n-\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE \u0026\u0026\n-\t\t    vlan-\u003emode != mode)\n-\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n+\t\tif (mode != vlan-\u003emode) {\n+\t\t\t/* Passthrough mode can't be set or cleared dynamically,\n+\t\t\t * regardless of existing source interfaces. Furthermore, source\n+\t\t\t * interfaces can't switch modes within a passhtrough port.\n+\t\t\t */\n+\t\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU ||\n+\t\t\t    macvlan_passthru(vlan-\u003eport))\n+\t\t\t\treturn -EINVAL;\n+\t\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE)\n+\t\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n+\t\t}\n \t}\n \n \tif (data \u0026\u0026 data[IFLA_MACVLAN_FLAGS]) {\n \t\t__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);\n \t\tbool promisc = (flags ^ vlan-\u003eflags) \u0026 MACVLAN_FLAG_NOPROMISC;\n-\t\tif (macvlan_passthru(vlan-\u003eport) \u0026\u0026 promisc) {\n+\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU \u0026\u0026 promisc) {\n \t\t\tint err;\n \n \t\t\tif (flags \u0026 MACVLAN_FLAG_NOPROMISC)\n@@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block *unused,\n \t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\n \t\t\t\t\t\tstruct macvlan_dev,\n \t\t\t\t\t\tlist);\n-\n-\t\tif (vlan \u0026\u0026 macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n+\t\t/* Validate the interface mode again because we're potentially\n+\t\t * triggered upon removal of the passthru interface. In which\n+\t\t * case it is already off the list (and has restored the lower\n+\t\t * device mac already).\n+\t\t */\n+\t\tif (!vlan || vlan-\u003emode != MACVLAN_MODE_PASSTHRU)\n+\t\t\treturn NOTIFY_DONE;\n+\t\tif (macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n \t\t\treturn NOTIFY_BAD;\n \n \t\tbreak;\n"
}

{
  "EnableConfigs": [
    "MACVLAN"
  ],
  "FocusSymbols": [
    "macvlan_common_newlink",
    "macvlan_changelink",
    "macvlan_uninit",
    "macvlan_sync_address",
    "macvlan_device_event",
    "macvlan_open",
    "macvlan_stop",
    "macvlan_fdb_add",
    "macvlan_fdb_del"
  ],
  "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.

================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.

- REACHABILITY IS THE PRIMARY GATE:
  Fuzzing can only discover bugs in code that can actually execute in standard virtualized
  environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
  If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
  regardless of whether it adds assertions or complex logic.

- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
  Patch authors routinely label changes as "cleanups", "refactorings", or state
  "No functional change intended". Do NOT take these claims at face value.
  Code refactorings that rearrange logic, introduce helper functions, or alter state management
  in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
  If reachable executable code is modified or refactored, it MUST be fuzzed.

- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
  When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
  BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
  Even if the author believes the invariant always holds, fuzzing is essential to verify whether
  an unusual sequence of operations can violate it.

================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:

- Non-kernel and non-executable changes:
  * Modifications to Documentation/, comments, or spelling fixes.
  * User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
    that do not affect the compiled kernel image (vmlinux) or kernel modules.
  * Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
    that do not alter control flow or data structures.
  * Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
  * Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
    ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
  * Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
    physical PCI hot-unplug or manual sysfs driver unbinding.
  * Code paths exclusive to architectures other than the target architecture.

================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
  * Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
    BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
  * Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
  * Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
  * Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).

================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:

- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
  Do NOT list generic, ubiquitous functions called by almost every program in the corpus
  (including, but not limited to: general memory allocators and deallocators, page fault
  and trap handlers, or core synchronization primitives; this is not an exhaustive list).
  Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
  which severely dilutes fuzzing effort away from the actual changes.

- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
  List functions that specifically implement the logic being added or altered, or direct API entrypoints
  for the subsystem feature under review.

- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
  Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
  distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
  If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
  functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).

================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit ae294554f8443ffab9a55f91b254932f3354f232
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 19 03:49:24 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index afad90b9222a2..76c11e5260334 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port *port)
 	port->flags |= MACVLAN_F_PASSTHRU;
 }
 
+static inline void macvlan_clear_passthru(struct macvlan_port *port)
+{
+	port->flags &= ~MACVLAN_F_PASSTHRU;
+}
+
 static inline bool macvlan_addr_change(const struct macvlan_port *port)
 {
 	return port->flags & MACVLAN_F_ADDRCHANGE;
@@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port *port,
 	 * currently in use by the underlying device or
 	 * another macvlan.
 	 */
-	if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
-	    ether_addr_equal_64bits(port->dev->dev_addr, addr))
+	if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 		return true;
 
 	if (macvlan_hash_lookup(port, addr))
@@ -637,7 +641,7 @@ static int macvlan_open(struct net_device *dev)
 	struct net_device *lowerdev = vlan->lowerdev;
 	int err;
 
-	if (macvlan_passthru(vlan->port)) {
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 			err = dev_set_promiscuity(lowerdev, 1);
 			if (err < 0)
@@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device *dev)
 	dev_uc_unsync(lowerdev, dev);
 	dev_mc_unsync(lowerdev, dev);
 
-	if (macvlan_passthru(vlan->port)) {
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 			dev_set_promiscuity(lowerdev, -1);
 		goto hash_del;
@@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device *dev,
 	struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;
 	struct macvlan_port *port = vlan->port;
+	bool passthru_dev = vlan->mode == MACVLAN_MODE_PASSTHRU;
 	int err;
 
 	if (!(dev->flags & IFF_UP)) {
 		/* Just copy in the new address */
 		eth_hw_addr_set(dev, addr);
 	} else {
-		/* Rehash and update the device filters */
-		if (macvlan_addr_busy(vlan->port, addr))
-			return -EADDRINUSE;
+		if (!passthru_dev) {
+			/* Rehash and update the device filters */
+			if (macvlan_addr_busy(vlan->port, addr))
+					return -EADDRINUSE;
 
-		if (!macvlan_passthru(port)) {
 			err = dev_uc_add(lowerdev, addr);
 			if (err)
 				return err;
@@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device *dev,
 
 		macvlan_hash_change_addr(vlan, addr);
 	}
-	if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
+	if (passthru_dev && !macvlan_addr_change(port)) {
 		/* Since addr_change isn't set, we are here due to lower
 		 * device change.  Save the lower-dev address so we can
 		 * restore it later.
@@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device *dev)
 
 	macvlan_flush_sources(port, vlan);
 	port->count -= 1;
-	if (!port->count)
+
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		/* If the lower device address has been changed by passthru
+		 * macvlan, put it back.
+		 *
+		 * Caution: This triggers NETDEV_CHANGEADDR on
+		 * the lower device. But we're in the green because
+		 * the passthru interface is already off the list.
+		 */
+		if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
+			struct sockaddr_storage ss;
+
+			ss.ss_family = port->dev->type;
+			memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
+			dev_set_mac_address(port->dev, &ss, NULL);
+		}
+		macvlan_clear_passthru(port);
+	}
+
+	if (port->count == 0)
 		macvlan_port_destroy(port->dev);
 }
 
@@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 	/* Support unicast filter only on passthru devices.
 	 * Multicast filter should be allowed on all devices.
 	 */
-	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+	if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr))
 		return -EOPNOTSUPP;
 
 	if (flags & NLM_F_REPLACE)
@@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 	/* Support unicast filter only on passthru devices.
 	 * Multicast filter should be allowed on all devices.
 	 */
-	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+	if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr))
 		return -EOPNOTSUPP;
 
 	if (is_unicast_ether_addr(addr))
@@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device *dev)
 		kfree_skb(skb);
 	}
 
-	/* If the lower device address has been changed by passthru
-	 * macvlan, put it back.
-	 */
-	if (macvlan_passthru(port) &&
-	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
-		struct sockaddr_storage ss;
-
-		ss.ss_family = port->dev->type;
-		memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
-		dev_set_mac_address(port->dev, &ss, NULL);
-	}
-
 	kfree(port);
 }
 
@@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device *dev,
 	}
 	port = macvlan_port_get_rtnl(lowerdev);
 
-	/* Only 1 macvlan device can be created in passthru mode */
-	if (macvlan_passthru(port)) {
-		/* The macvlan port must be not created this time,
-		 * still goto destroy_macvlan_port for readability.
-		 */
-		err = -EINVAL;
-		goto destroy_macvlan_port;
-	}
-
 	vlan->lowerdev = lowerdev;
 	vlan->dev      = dev;
 	vlan->port     = port;
@@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device *dev,
 	if (data && data[IFLA_MACVLAN_FLAGS])
 		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 
+	/* Only 1 macvlan device can be created in passthru mode. There may be
+	 * additional source mode devices but nothing else at the moment.
+	 *
+	 * First check if adding a source mode device to an existing passthru vlan.
+	 */
+	if (macvlan_passthru(port) && vlan->mode != MACVLAN_MODE_SOURCE) {
+		/* The macvlan port must be not created this time,
+		 * still goto destroy_macvlan_port for readability.
+		 */
+		err = -EINVAL;
+		goto destroy_macvlan_port;
+	}
+
+	/* Now check if adding a passthru device to an existing set of source mode
+	 * devices.
+	 */
 	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
-		if (port->count) {
-			err = -EINVAL;
-			goto destroy_macvlan_port;
+		struct macvlan_dev *p;
+
+		list_for_each_entry(p, &port->vlans, list) {
+			if (p->mode != MACVLAN_MODE_SOURCE) {
+				err = -EINVAL;
+				goto destroy_macvlan_port;
+			}
 		}
-		macvlan_set_passthru(port);
 		eth_hw_addr_inherit(dev, lowerdev);
 	}
 
@@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device *dev,
 	if (err)
 		goto unregister_netdev;
 
-	list_add_tail_rcu(&vlan->list, &port->vlans);
+	/* macvlan_handle_frame expects the (one and only) passthru device first. */
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		macvlan_set_passthru(port);
+		list_add_rcu(&vlan->list, &port->vlans);
+	} else
+		list_add_tail_rcu(&vlan->list, &port->vlans);
 	update_port_bc_queue_len(vlan->port);
 	netif_stacked_transfer_operstate(lowerdev, dev);
 	linkwatch_fire_event(dev);
@@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device *dev,
 	if (data && data[IFLA_MACVLAN_MODE]) {
 		set_mode = true;
 		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
-		/* Passthrough mode can't be set or cleared dynamically */
-		if ((mode == MACVLAN_MODE_PASSTHRU) !=
-		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
-			return -EINVAL;
-		if (vlan->mode == MACVLAN_MODE_SOURCE &&
-		    vlan->mode != mode)
-			macvlan_flush_sources(vlan->port, vlan);
+		if (mode != vlan->mode) {
+			/* Passthrough mode can't be set or cleared dynamically,
+			 * regardless of existing source interfaces. Furthermore, source
+			 * interfaces can't switch modes within a passhtrough port.
+			 */
+			if (vlan->mode == MACVLAN_MODE_PASSTHRU ||
+			    macvlan_passthru(vlan->port))
+				return -EINVAL;
+			if (vlan->mode == MACVLAN_MODE_SOURCE)
+				macvlan_flush_sources(vlan->port, vlan);
+		}
 	}
 
 	if (data && data[IFLA_MACVLAN_FLAGS]) {
 		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
-		if (macvlan_passthru(vlan->port) && promisc) {
+		if (vlan->mode == MACVLAN_MODE_PASSTHRU && promisc) {
 			int err;
 
 			if (flags & MACVLAN_FLAG_NOPROMISC)
@@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block *unused,
 		vlan = list_first_entry_or_null(&port->vlans,
 						struct macvlan_dev,
 						list);
-
-		if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
+		/* Validate the interface mode again because we're potentially
+		 * triggered upon removal of the passthru interface. In which
+		 * case it is already off the list (and has restored the lower
+		 * device mac already).
+		 */
+		if (!vlan || vlan->mode != MACVLAN_MODE_PASSTHRU)
+			return NOTIFY_DONE;
+		if (macvlan_sync_address(vlan->dev, dev->dev_addr))
 			return NOTIFY_BAD;
 
 		break;

							input: 6296
							output: 27
							thoughts: 327

**Analyzing a Macvlan Patch**

Okay, so this patch is touching `drivers/net/macvlan.c`. Right, macvlan... let me refresh my memory. It's a virtual network device driver in Linux, allowing multiple virtual interfaces to share a single physical or virtual NIC, each with its own MAC address. Makes sense. It’s useful, particularly in virtualized environments. Hmm, are there any implications for standard virtualized setups, like QEMU or even with something like syzkaller? Oh yeah, Syzkaller uses this all the time, particularly leveraging netlink for it and especially `RTM_NEWLINK` with `macvlan` link info to create macvlan interfaces. Good to keep in mind.

Now, where are the changes? The patch is all over the place within the macvlan code. Looks like it's touching `macvlan_clear_passthru`, `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_uninit`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_port_destroy`, `macvlan_common_newlink`, `macvlan_changelink`, and `macvlan_device_event`. Seems comprehensive.

It looks like the key changes allow mixing `MACVLAN_MODE_PASSTHRU` and `MACVLAN_MODE_SOURCE` devices. That could get interesting. It's also changing the tracking and uninitialization of passthru mode, address synchronization, how `macvlan_open` and `macvlan_stop` work, as well as `macvlan_uninit`, where it's restoring the lower device's MAC address and clearing passthru, among other things. I need to dig into the details to understand the specific implications of these changes in the code. I better check the Kconfig for macvlan as well, to make sure this doesn't introduce any surprises there.

{
  "Expression": "MACVLAN",
  "PathPrefix": "drivers/net/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 973 lines.\nUse more precise expression if possible.\n\ndrivers/net/Kconfig=163=source \"drivers/net/team/Kconfig\"\ndrivers/net/Kconfig-164-\ndrivers/net/Kconfig:165:config MACVLAN\ndrivers/net/Kconfig-166-\ttristate \"MAC-VLAN support\"\n--\ndrivers/net/Kconfig=179=config MACVTAP\ndrivers/net/Kconfig-180-\ttristate \"MAC-VLAN based tap driver\"\ndrivers/net/Kconfig:181:\tdepends on MACVLAN\ndrivers/net/Kconfig-182-\tdepends on INET\n--\ndrivers/net/Makefile=18=obj-$(CONFIG_AMT) += amt.o\ndrivers/net/Makefile:19:obj-$(CONFIG_MACVLAN) += macvlan.o\ndrivers/net/Makefile-20-obj-$(CONFIG_MACVTAP) += macvtap.o\n--\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h=10=enum HCLGE_MBX_OPCODE {\n--\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h-18-\tHCLGE_MBX_SET_PROMISC_MODE,\t/* (VF -\u003e PF) set promiscuous mode */\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h:19:\tHCLGE_MBX_SET_MACVLAN,\t\t/* (VF -\u003e PF) set unicast filter */\ndrivers/net/ethernet/hisilicon/hns3/hclge_mbx.h-20-\tHCLGE_MBX_API_NEGOTIATE,\t/* (VF -\u003e PF) negotiate API version */\n--\ndrivers/net/ethernet/intel/fm10k/fm10k.h=268=enum fm10k_state_t {\n--\ndrivers/net/ethernet/intel/fm10k/fm10k.h-275-\t__FM10K_SERVICE_DISABLE,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:276:\t__FM10K_MACVLAN_SCHED,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:277:\t__FM10K_MACVLAN_REQUEST,\ndrivers/net/ethernet/intel/fm10k/fm10k.h:278:\t__FM10K_MACVLAN_DISABLE,\ndrivers/net/ethernet/intel/fm10k/fm10k.h-279-\t__FM10K_LINK_DOWN,\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c=410=static void fm10k_type_trans(struct fm10k_ring *rx_ring,\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c-416-\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c:417:\t/* check to see if DGLORT belongs to a MACVLAN */\ndrivers/net/ethernet/intel/fm10k/fm10k_main.c-418-\tif (l2_accel) {\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c=1176=void fm10k_reset_rx_state(struct fm10k_intfc *interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c-1181-\t/* Wait for MAC/VLAN work to finish */\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c:1182:\twhile (test_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_netdev.c-1183-\t\tusleep_range(1000, 2000);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=85=void fm10k_macvlan_schedule(struct fm10k_intfc *interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-89-\t */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:90:\tif (!test_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate) \u0026\u0026\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:91:\t    !test_and_set_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate)) {\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:92:\t\tclear_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-93-\t\t/* We delay the actual start of execution in order to allow\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-100-\t} else {\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:101:\t\tset_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-102-\t}\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=112=static void fm10k_stop_macvlan_task(struct fm10k_intfc *interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-114-\t/* Disable the MAC/VLAN work item */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:115:\tset_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-116-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-119-\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:120:\t/* We set the __FM10K_MACVLAN_SCHED bit when we schedule the task.\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-121-\t * However, it may not be unset of the MAC/VLAN task never actually\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-125-\t */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:126:\tclear_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-127-}\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-132- *\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:133: * Clear the __FM10K_MACVLAN_DISABLE bit and, if a request occurred, schedule\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-134- * the MAC/VLAN work monitor.\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=136=static void fm10k_resume_macvlan_task(struct fm10k_intfc *interface)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-138-\t/* Re-enable the MAC/VLAN work item */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:139:\tclear_bit(__FM10K_MACVLAN_DISABLE, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-140-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-143-\t */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:144:\tif (test_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-145-\t\tfm10k_macvlan_schedule(interface);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c=765=static void fm10k_macvlan_task(struct work_struct *work)\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-802-\t\t\thw-\u003embx.ops.process(hw, \u0026hw-\u003embx);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:803:\t\t\tset_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-804-\t\t\tfm10k_mbx_unlock(interface);\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-845-done:\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:846:\tWARN_ON(!test_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate));\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-847-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-849-\tsmp_mb__before_atomic();\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:850:\tclear_bit(__FM10K_MACVLAN_SCHED, interface-\u003estate);\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-851-\n--\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-855-\t */\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c:856:\tif (test_bit(__FM10K_MACVLAN_REQUEST, interface-\u003estate))\ndrivers/net/ethernet/intel/fm10k/fm10k_pci.c-857-\t\tfm10k_macvlan_schedule(interface);\n--\ndrivers/net/ethernet/intel/i40e/i40e.h=83=enum i40e_state {\n--\ndrivers/net/ethernet/intel/i40e/i40e.h-112-\t__I40E_VF_DISABLE,\ndrivers/net/ethernet/intel/i40e/i40e.h:113:\t__I40E_MACVLAN_SYNC_PENDING,\ndrivers/net/ethernet/intel/i40e/i40e.h-114-\t__I40E_TEMP_LINK_POLLING,\n--\ndrivers/net/ethernet/intel/i40e/i40e.h=815=struct i40e_vsi {\n--\ndrivers/net/ethernet/intel/i40e/i40e.h-924-\t/* macvlan fields */\ndrivers/net/ethernet/intel/i40e/i40e.h:925:#define I40E_MAX_MACVLANS\t\t128 /* Max HW vectors - 1 on FVL */\ndrivers/net/ethernet/intel/i40e/i40e.h:926:#define I40E_MIN_MACVLAN_VECTORS\t2   /* Min vectors to enable macvlans */\ndrivers/net/ethernet/intel/i40e/i40e.h:927:\tDECLARE_BITMAP(fwd_bitmask, I40E_MAX_MACVLANS);\ndrivers/net/ethernet/intel/i40e/i40e.h-928-\tstruct list_head macvlan_list;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=755=struct i40e_aqc_macvlan {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-757-\t__le16\tseid[3];\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:758:#define I40E_AQC_MACVLAN_CMD_SEID_VALID\t\t0x8000\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-759-\t__le32\taddr_high;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=766=struct i40e_aqc_add_macvlan_element_data {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-769-\t__le16\tflags;\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:770:#define I40E_AQC_MACVLAN_ADD_PERFECT_MATCH\t0x0001\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:771:#define I40E_AQC_MACVLAN_ADD_IGNORE_VLAN\t0x0004\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:772:#define I40E_AQC_MACVLAN_ADD_USE_SHARED_MAC\t0x0010\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-773-\t__le16\tqueue_number;\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h=796=struct i40e_aqc_remove_macvlan_element_data {\n--\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-799-\tu8\tflags;\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:800:#define I40E_AQC_MACVLAN_DEL_PERFECT_MATCH\t0x01\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:801:#define I40E_AQC_MACVLAN_DEL_IGNORE_VLAN\t0x08\ndrivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h-802-\tu8\treserved[3];\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2198=i40e_prepare_add_macvlan(struct i40e_aqc_add_macvlan_element_data *mv_list,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2209-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2210:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID | seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2211-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2216-\t\t\tmv_list[i].flags |=\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2217:\t\t\t       cpu_to_le16(I40E_AQC_MACVLAN_ADD_USE_SHARED_MAC);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2218-\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2297=i40e_aq_remove_macvlan(struct i40e_hw *hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2314-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2315:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID | seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2316-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=2345=i40e_aq_remove_macvlan_v2(struct i40e_hw *hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2362-\tcmd-\u003enum_addresses = cpu_to_le16(count);\ndrivers/net/ethernet/intel/i40e/i40e_common.c:2363:\tcmd-\u003eseid[0] = cpu_to_le16(I40E_AQC_MACVLAN_CMD_SEID_VALID | seid);\ndrivers/net/ethernet/intel/i40e/i40e_common.c-2364-\tcmd-\u003eseid[1] = 0;\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c=3681=int i40e_set_filter_control(struct i40e_hw *hw,\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3720-\ndrivers/net/ethernet/intel/i40e/i40e_common.c:3721:\t/* Enable FDIR, Ethertype and MACVLAN filters for PF and VFs */\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3722-\tif (settings-\u003eenable_fdir)\n--\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3726-\tif (settings-\u003eenable_macvlan)\ndrivers/net/ethernet/intel/i40e/i40e_common.c:3727:\t\tval |= I40E_PFQF_CTL_0_MACVLAN_ENA_MASK;\ndrivers/net/ethernet/intel/i40e/i40e_common.c-3728-\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1611=static void i40e_rm_default_mac_filter(struct i40e_vsi *vsi, u8 *macaddr)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1623-\t/* Ignore error returns, some firmware does it this way... */\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1624:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1625-\ti40e_aq_remove_macvlan(\u0026pf-\u003ehw, vsi-\u003eseid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1630-\t/* ...and some firmware does it this way. */\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1631:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH |\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1632:\t\t\tI40E_AQC_MACVLAN_DEL_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1633-\ti40e_aq_remove_macvlan(\u0026pf-\u003ehw, vsi-\u003eseid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1647=struct i40e_mac_filter *i40e_add_filter(struct i40e_vsi *vsi,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1676-\t\tvsi-\u003eflags |= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1677:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1678-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=1708=void __i40e_del_filter(struct i40e_vsi *vsi, struct i40e_mac_filter *f)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1725-\tvsi-\u003eflags |= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:1726:\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-1727-}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2230=static void i40e_set_rx_mode(struct net_device *netdev)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2244-\t\tvsi-\u003eflags |= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2245:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, vsi-\u003eback-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2246-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2555=int i40e_sync_vsi_filters(struct i40e_vsi *vsi)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2682-\t\t\t\tdel_list[num_del].vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2683:\t\t\t\tcmd_flags |= I40E_AQC_MACVLAN_DEL_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2684-\t\t\t} else {\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2688-\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2689:\t\t\tcmd_flags |= I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2690-\t\t\tdel_list[num_del].flags = cmd_flags;\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2747-\t\t\t\tadd_list[num_add].vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2748:\t\t\t\tcmd_flags |= I40E_AQC_MACVLAN_ADD_IGNORE_VLAN;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2749-\t\t\t} else {\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2755-\t\t\tadd_list[num_add].match_method = I40E_AQC_MM_ERR_NO_RES;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2756:\t\t\tcmd_flags |= I40E_AQC_MACVLAN_ADD_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2757-\t\t\tadd_list[num_add].flags = cpu_to_le16(cmd_flags);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=2894=static void i40e_sync_filters_subtask(struct i40e_pf *pf)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2900-\t\treturn;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2901:\tif (!test_and_clear_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate))\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2902-\t\treturn;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2903-\tif (test_bit(__I40E_VF_DISABLE, pf-\u003estate)) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2904:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2905-\t\treturn;\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2914-\t\t\t\t/* come back and try again later */\ndrivers/net/ethernet/intel/i40e/i40e_main.c:2915:\t\t\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING,\ndrivers/net/ethernet/intel/i40e/i40e_main.c-2916-\t\t\t\t\tpf-\u003estate);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=7713=static int i40e_del_macvlan_filter(struct i40e_hw *hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7721-\telement.vlan_tag = 0;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:7722:\telement.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7723-\tstatus = i40e_aq_remove_macvlan(hw, seid, \u0026element, 1, NULL);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=7739=static int i40e_add_macvlan_filter(struct i40e_hw *hw, u16 seid,\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7749-\telement.match_method = I40E_AQC_MM_ERR_NO_RES;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:7750:\tcmd_flags |= I40E_AQC_MACVLAN_ADD_PERFECT_MATCH;\ndrivers/net/ethernet/intel/i40e/i40e_main.c-7751-\telement.flags = cpu_to_le16(cmd_flags);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=8005=static void *i40e_fwd_add(struct net_device *netdev, struct net_device *vdev)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8021-\t}\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8022:\tif (pf-\u003enum_lan_msix \u003c I40E_MIN_MACVLAN_VECTORS) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8023-\t\tnetdev_info(netdev, \"Not enough vectors available to support macvlans\\n\");\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8041-\t\tvectors = pf-\u003enum_lan_msix;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8042:\t\tif (vectors \u003c= I40E_MAX_MACVLANS \u0026\u0026 vectors \u003e 64) {\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8043-\t\t\t/* allocate 4 Qs per macvlan and 32 Qs to the PF*/\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8080-\t\t\t\t\t    vsi-\u003emacvlan_cnt);\ndrivers/net/ethernet/intel/i40e/i40e_main.c:8081:\tif (avail_macvlan \u003e= I40E_MAX_MACVLANS)\ndrivers/net/ethernet/intel/i40e/i40e_main.c-8082-\t\treturn ERR_PTR(-EBUSY);\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=13905=static int i40e_add_vsi(struct i40e_vsi *vsi)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-14121-\t\tvsi-\u003eflags |= I40E_VSI_FLAG_FILTER_CHANGED;\ndrivers/net/ethernet/intel/i40e/i40e_main.c:14122:\t\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_main.c-14123-\t}\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c=15241=static int i40e_setup_pf_filter_control(struct i40e_pf *pf)\n--\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15251-\ndrivers/net/ethernet/intel/i40e/i40e_main.c:15252:\t/* Ethtype and MACVLAN filters enabled for PF */\ndrivers/net/ethernet/intel/i40e/i40e_main.c-15253-\tsettings-\u003eenable_ethtype = true;\n--\ndrivers/net/ethernet/intel/i40e/i40e_register.h-623-#define I40E_PFQF_CTL_0_ETYPE_ENA_MASK I40E_MASK(0x1, I40E_PFQF_CTL_0_ETYPE_ENA_SHIFT)\ndrivers/net/ethernet/intel/i40e/i40e_register.h:624:#define I40E_PFQF_CTL_0_MACVLAN_ENA_SHIFT 19\ndrivers/net/ethernet/intel/i40e/i40e_register.h:625:#define I40E_PFQF_CTL_0_MACVLAN_ENA_MASK I40E_MASK(0x1, I40E_PFQF_CTL_0_MACVLAN_ENA_SHIFT)\ndrivers/net/ethernet/intel/i40e/i40e_register.h-626-#define I40E_PFQF_CTL_1 0x00245D80 /* Reset: CORER */\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=2830=static int i40e_vc_get_stats_msg(struct i40e_vf *vf, u8 *msg)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2864-\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2865:#define I40E_MAX_MACVLAN_PER_HW 3072\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2866:#define I40E_MAX_MACVLAN_PER_PF(num_ports) (I40E_MAX_MACVLAN_PER_HW /\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2867-\t(num_ports))\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2873-\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2874:#define I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(vf_num, num_ports)\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2875-({\ttypeof(vf_num) vf_num_ = (vf_num);\t\t\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2876-\ttypeof(num_ports) num_ports_ = (num_ports);\t\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2877:\t((I40E_MAX_MACVLAN_PER_PF(num_ports_) - vf_num_ *\t\t\\\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2878-\tI40E_VC_MAX_MAC_ADDR_PER_VF) / vf_num_) +\t\t\t\\\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=2897=static inline int i40e_check_vf_permission(struct i40e_vf *vf,\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2954-\telse\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:2955:\t\tmac_add_max = I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(pf-\u003enum_alloc_vfs, hw-\u003enum_ports);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-2956-\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c=4954=int i40e_ndo_set_vf_trust(struct net_device *netdev, int vf_id, bool setting)\n--\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-4986-\t/* request PF to sync mac/vlan filters for the VF */\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c:4987:\tset_bit(__I40E_MACVLAN_SYNC_PENDING, pf-\u003estate);\ndrivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c-4988-\tpf-\u003evsi[vf-\u003elan_vsi_idx]-\u003eflags |= I40E_VSI_FLAG_FILTER_CHANGED;\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=148=enum ixgbe_tx_flags {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-174-#define MAX_EMULATION_MAC_ADDRS         16\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:175:#define IXGBE_MAX_PF_MACVLANS           15\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-176-#define VMDQ_P(p)   ((p) + adapter-\u003ering_feature[RING_F_VMDQ].offset)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=409=enum ixgbe_ring_f_enum {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-430-#define IXGBE_BAD_L2A_QUEUE\t\t3\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:431:#define IXGBE_MAX_MACVLANS\t\t63\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-432-\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h=616=struct ixgbe_adapter {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-828-\t/* Bitmask indicating in use pools */\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h:829:\tDECLARE_BITMAP(fwd_bitmask, IXGBE_MAX_MACVLANS + 1);\ndrivers/net/ethernet/intel/ixgbe/ixgbe.h-830-\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c=1889=void ixgbe_process_skb_fields(struct ixgbe_ring *rx_ring,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-1913-\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c:1914:\t/* record Rx queue, or update MACVLAN statistics */\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-1915-\tif (netif_is_ixgbe(dev))\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c=10741=static void *ixgbe_fwd_add(struct net_device *pdev, struct net_device *vdev)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-10773-\t\t     adapter-\u003enum_rx_pools \u003e= (MAX_TX_QUEUES / tcs)) ||\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c:10774:\t\t    adapter-\u003enum_rx_pools \u003e IXGBE_MAX_MACVLANS)\ndrivers/net/ethernet/intel/ixgbe/ixgbe_main.c-10775-\t\t\treturn ERR_PTR(-EBUSY);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h=46=enum ixgbe_pfvf_api_rev {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h-67-#define IXGBE_VF_SET_LPE\t0x05 /* VF requests PF to set VMOLR.LPE */\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h:68:#define IXGBE_VF_SET_MACVLAN\t0x06 /* VF requests PF for unicast filter */\ndrivers/net/ethernet/intel/ixgbe/ixgbe_mbx.h-69-#define IXGBE_VF_API_NEGOTIATE\t0x08 /* negotiate API version */\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=25=static inline void ixgbe_alloc_vf_macvlans(struct ixgbe_adapter *adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-35-\tnum_vf_macvlans = hw-\u003emac.num_rar_entries -\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:36:\t\t\t  (IXGBE_MAX_PF_MACVLANS + 1 + num_vfs);\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-37-\tif (!num_vf_macvlans)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=643=static int ixgbe_set_vf_macvlan(struct ixgbe_adapter *adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-680-\t * memory allocation for the list failed, which is not fatal but does\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:681:\t * mean we can't support VF requests for MACVLAN because we couldn't\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-682-\t * allocate memory for the list management required.\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=995=static int ixgbe_set_vf_macvlan_msg(struct ixgbe_adapter *adapter,\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1004-\t\te_warn(drv,\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1005:\t\t       \"VF %d requested MACVLAN filter but is administratively denied\\n\",\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1006-\t\t       vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1031-\t\te_warn(drv,\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1032:\t\t       \"VF %d has requested a MACVLAN filter but there is no space for it\\n\",\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1033-\t\t       vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c=1328=static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1374-\t\tbreak;\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c:1375:\tcase IXGBE_VF_SET_MACVLAN:\ndrivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c-1376-\t\tretval = ixgbe_set_vf_macvlan_msg(adapter, msgbuf, vf);\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h=2572=enum ixgbe_fdir_pballoc_type {\n--\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h-2591-#define IXGBE_FDIRCTRL_FILTERMODE_SHIFT\t\t21\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h:2592:#define IXGBE_FDIRCTRL_FILTERMODE_MACVLAN\t0x0001 /* bit 23:21, 001b */\ndrivers/net/ethernet/intel/ixgbe/ixgbe_type.h-2593-#define IXGBE_FDIRCTRL_FILTERMODE_CLOUD\t\t0x0002 /* bit 23:21, 010b */\n--\ndrivers/net/ethernet/intel/ixgbevf/mbx.h=61=enum ixgbe_pfvf_api_rev {\n--\ndrivers/net/ethernet/intel/ixgbevf/mbx.h-82-#define IXGBE_VF_SET_LPE\t0x05 /* VF requests PF to set VMOLR.LPE */\ndrivers/net/ethernet/intel/ixgbevf/mbx.h:83:#define IXGBE_VF_SET_MACVLAN\t0x06 /* VF requests PF for unicast filter */\ndrivers/net/ethernet/intel/ixgbevf/mbx.h-84-#define IXGBE_VF_API_NEGOTIATE\t0x08 /* negotiate API version */\n--\ndrivers/net/ethernet/intel/ixgbevf/vf.c=250=static s32 ixgbevf_set_uc_addr_vf(struct ixgbe_hw *hw, u32 index, u8 *addr)\n--\ndrivers/net/ethernet/intel/ixgbevf/vf.c-262-\tmsgbuf[0] |= index \u003c\u003c IXGBE_VT_MSGINFO_SHIFT;\ndrivers/net/ethernet/intel/ixgbevf/vf.c:263:\tmsgbuf[0] |= IXGBE_VF_SET_MACVLAN;\ndrivers/net/ethernet/intel/ixgbevf/vf.c-264-\tmsgbuf_chk = msgbuf[0];\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c=1186=int mlx4_QUERY_PORT(struct mlx4_dev *dev, int port, struct mlx4_port_cap *port_cap)\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1221-#define QUERY_PORT_MAX_GID_PKEY_OFFSET\t\t0x07\ndrivers/net/ethernet/mellanox/mlx4/fw.c:1222:#define QUERY_PORT_MAX_MACVLAN_OFFSET\t\t0x0a\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1223-#define QUERY_PORT_MAX_VL_OFFSET\t\t0x0b\n--\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1249-\t\tport_cap-\u003emax_tc_eth\t   = field \u003e\u003e 4;\ndrivers/net/ethernet/mellanox/mlx4/fw.c:1250:\t\tMLX4_GET(field, outbox, QUERY_PORT_MAX_MACVLAN_OFFSET);\ndrivers/net/ethernet/mellanox/mlx4/fw.c-1251-\t\tport_cap-\u003elog_max_macs  = field \u0026 0xf;\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c=436=static bool mlx5e_rep_macvlan_mode_supported(const struct net_device *dev)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c-439-\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c:440:\treturn macvlan-\u003emode == MACVLAN_MODE_PASSTHRU;\ndrivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c-441-}\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h=330=enum ionic_lif_type {\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-331-\tIONIC_LIF_TYPE_CLASSIC = 0,\ndrivers/net/ethernet/pensando/ionic/ionic_if.h:332:\tIONIC_LIF_TYPE_MACVLAN = 1,\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-333-\tIONIC_LIF_TYPE_NETQUEUE = 2,\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h=2033=enum ionic_rx_filter_match_type {\n--\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-2050- *\t@mac.addr:  MAC address (network-byte order)\ndrivers/net/ethernet/pensando/ionic/ionic_if.h:2051: * @mac_vlan:   MACVLAN filter\ndrivers/net/ethernet/pensando/ionic/ionic_if.h-2052- *\t@mac_vlan.vlan:  VLAN ID\n--\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h=44=enum wx_pfvf_api_rev {\n--\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h-55-#define WX_VF_SET_LPE                0x05 /* VF requests PF to set VMOLR.LPE */\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h:56:#define WX_VF_SET_MACVLAN            0x06 /* VF requests PF unicast filter */\ndrivers/net/ethernet/wangxun/libwx/wx_mbx.h-57-#define WX_VF_API_NEGOTIATE          0x08 /* negotiate API version */\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=22=static int wx_alloc_vf_macvlans(struct wx *wx, u8 num_vfs)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-30-\tnum_vf_macvlans = wx-\u003emac.num_rar_entries -\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:31:\t\t\t  (WX_MAX_PF_MACVLANS + 1 + num_vfs);\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-32-\tif (!num_vf_macvlans)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=639=static int wx_set_vf_macvlan_msg(struct wx *wx, u32 *msgbuf, u16 vf)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-646-\tif (wx-\u003evfinfo[vf].pf_set_mac \u0026\u0026 index \u003e 0) {\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:647:\t\twx_err(wx, \"VF %d request MACVLAN filter but is denied\\n\", vf);\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-648-\t\treturn -EINVAL;\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-666-\t\twx_err(wx,\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:667:\t\t       \"VF %d request MACVLAN filter but there is no space\\n\",\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-668-\t\t       vf);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c=755=static void wx_rcv_msg_from_vf(struct wx *wx, u16 vf)\n--\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-799-\t\tbreak;\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c:800:\tcase WX_VF_SET_MACVLAN:\ndrivers/net/ethernet/wangxun/libwx/wx_sriov.c-801-\t\tretval = wx_set_vf_macvlan_msg(wx, msgbuf, vf);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_type.h-23-#define WX_PCI_LINK_STATUS                      0xB2\ndrivers/net/ethernet/wangxun/libwx/wx_type.h:24:#define WX_MAX_PF_MACVLANS                      15\ndrivers/net/ethernet/wangxun/libwx/wx_type.h-25-#define WX_MAX_VF_MC_ENTRIES                    30\n--\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c=349=int wx_set_uc_addr_vf(struct wx *wx, u32 index, u8 *addr)\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-350-{\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c:351:\tu32 msgbuf[3] = {WX_VF_SET_MACVLAN};\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-352-\tu8 *msg_addr = (u8 *)(\u0026msgbuf[1]);\n--\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-369-\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c:370:\tif (msgbuf[0] == (WX_VF_SET_MACVLAN | WX_VT_MSGTYPE_NACK))\ndrivers/net/ethernet/wangxun/libwx/wx_vf.c-371-\t\treturn -EINVAL;\n--\ndrivers/net/macvlan.c-36-\ndrivers/net/macvlan.c:37:#define MACVLAN_HASH_BITS\t8\ndrivers/net/macvlan.c:38:#define MACVLAN_HASH_SIZE\t(1\u003c\u003cMACVLAN_HASH_BITS)\ndrivers/net/macvlan.c:39:#define MACVLAN_DEFAULT_BC_QUEUE_LEN\t1000\ndrivers/net/macvlan.c-40-\ndrivers/net/macvlan.c:41:#define MACVLAN_F_PASSTHRU\t1\ndrivers/net/macvlan.c:42:#define MACVLAN_F_ADDRCHANGE\t2\ndrivers/net/macvlan.c-43-\ndrivers/net/macvlan.c=44=struct macvlan_port {\ndrivers/net/macvlan.c-45-\tstruct net_device\t*dev;\ndrivers/net/macvlan.c:46:\tstruct hlist_head\tvlan_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c-47-\tstruct list_head\tvlans;\n--\ndrivers/net/macvlan.c-53-\tint\t\t\tcount;\ndrivers/net/macvlan.c:54:\tstruct hlist_head\tvlan_source_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c:55:\tDECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);\ndrivers/net/macvlan.c:56:\tDECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);\ndrivers/net/macvlan.c-57-\tunsigned char           perm_addr[ETH_ALEN];\n--\ndrivers/net/macvlan.c=67=struct macvlan_skb_cb {\n--\ndrivers/net/macvlan.c-70-\ndrivers/net/macvlan.c:71:#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)\u0026((__skb)-\u003ecb[0]))\ndrivers/net/macvlan.c-72-\n--\ndrivers/net/macvlan.c=76=static inline bool macvlan_passthru(const struct macvlan_port *port)\ndrivers/net/macvlan.c-77-{\ndrivers/net/macvlan.c:78:\treturn port-\u003eflags \u0026 MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-79-}\n--\ndrivers/net/macvlan.c=81=static inline void macvlan_set_passthru(struct macvlan_port *port)\ndrivers/net/macvlan.c-82-{\ndrivers/net/macvlan.c:83:\tport-\u003eflags |= MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-84-}\n--\ndrivers/net/macvlan.c=86=static inline void macvlan_clear_passthru(struct macvlan_port *port)\ndrivers/net/macvlan.c-87-{\ndrivers/net/macvlan.c:88:\tport-\u003eflags \u0026= ~MACVLAN_F_PASSTHRU;\ndrivers/net/macvlan.c-89-}\n--\ndrivers/net/macvlan.c=91=static inline bool macvlan_addr_change(const struct macvlan_port *port)\ndrivers/net/macvlan.c-92-{\ndrivers/net/macvlan.c:93:\treturn port-\u003eflags \u0026 MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-94-}\n--\ndrivers/net/macvlan.c=96=static inline void macvlan_set_addr_change(struct macvlan_port *port)\ndrivers/net/macvlan.c-97-{\ndrivers/net/macvlan.c:98:\tport-\u003eflags |= MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-99-}\n--\ndrivers/net/macvlan.c=101=static inline void macvlan_clear_addr_change(struct macvlan_port *port)\ndrivers/net/macvlan.c-102-{\ndrivers/net/macvlan.c:103:\tport-\u003eflags \u0026= ~MACVLAN_F_ADDRCHANGE;\ndrivers/net/macvlan.c-104-}\n--\ndrivers/net/macvlan.c=107=static u32 macvlan_eth_hash(const unsigned char *addr)\n\n"
}

							input: 22444
							output: 34
							thoughts: 17

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the Kernel Network Configuration**

Okay, so I need to zero in on a specific network-related configuration detail. My initial hunch is that it's likely defined within `drivers/net/Kconfig`, given that this is where a vast majority of the network driver configurations reside. I'm going to jump straight to the general area of line 165. While I don't know the specifics, based on my experience, that line number falls within a common area where this type of declaration will likely reside. From there, I can begin to quickly assess the contextual surrounding information. This allows me to see the configuration and from that point, either confirm the presence of, or the absence of, the expected parameter.

{
  "File": "drivers/net/Kconfig",
  "FirstLine": 160,
  "LineCount": 35
}

{
  "Contents": " 160:\t\t  'ifb1' etc.\n 161:\t\t  Look at the iproute2 documentation directory for usage etc\n 162:\t\n 163:\tsource \"drivers/net/team/Kconfig\"\n 164:\t\n 165:\tconfig MACVLAN\n 166:\t\ttristate \"MAC-VLAN support\"\n 167:\t\thelp\n 168:\t\t  This allows one to create virtual interfaces that map packets to\n 169:\t\t  or from specific MAC addresses to a particular interface.\n 170:\t\n 171:\t\t  Macvlan devices can be added using the \"ip\" command from the\n 172:\t\t  iproute2 package starting with the iproute2-2.6.23 release:\n 173:\t\n 174:\t\t  \"ip link add link \u003creal dev\u003e [ address MAC ] [ NAME ] type macvlan\"\n 175:\t\n 176:\t\t  To compile this driver as a module, choose M here: the module\n 177:\t\t  will be called macvlan.\n 178:\t\n 179:\tconfig MACVTAP\n 180:\t\ttristate \"MAC-VLAN based tap driver\"\n 181:\t\tdepends on MACVLAN\n 182:\t\tdepends on INET\n 183:\t\tselect TAP\n 184:\t\thelp\n 185:\t\t  This adds a specialized tap character device driver that is based\n 186:\t\t  on the MAC-VLAN network interface, called macvtap. A macvtap device\n 187:\t\t  can be added in the same way as a macvlan device, using 'type\n 188:\t\t  macvtap', and then be accessed through the tap user space interface.\n 189:\t\n 190:\t\t  To compile this driver as a module, choose M here: the module\n 191:\t\t  will be called macvtap.\n 192:\t\n 193:\tconfig IPVLAN_L3S\n 194:\t\tdepends on NETFILTER\n"
}

							input: 23202
							output: 37
							thoughts: 2095

**Analyzing the MACVLAN Changes**

Okay, let's dive into these MACVLAN changes. First off, CONFIG_MACVLAN has no external dependencies, which simplifies things. The diff looks to be focused primarily on the passthru mode. It seems like the core changes are around how passthru mode interacts with other MACVLAN modes, especially source mode, and how the underlying device's MAC address is handled.

Looking at `macvlan_addr_busy`, the checks for passthru and address changes have been removed, simplifying the logic. This suggests a direct check against the lower device's MAC, which probably means that the passthru mode now has more direct control over the address.

In `macvlan_open` and `macvlan_stop`, the `macvlan_passthru` check has been replaced with a direct `vlan->mode == MACVLAN_MODE_PASSTHRU` check. This is cleaner and more explicit. Similarly, `macvlan_sync_address` gets a boolean for passthru and conditional logic. Now, if we are _not_ in passthru mode, we add the address to the device filters, which seems more straightforward.

The significant changes are in `macvlan_uninit`. The code now handles restoring the lower device's MAC address when a passthru VLAN is uninitialized. The previous location to restore the lower device address to its original value was in `macvlan_port_destroy`, which was causing race conditions. This is a critical change. It appears this addresses a potential race condition or cleanup issue when a passthru interface is removed. The `macvlan_port_destroy` change suggests the lower device address restoration was moved to `macvlan_uninit`. It restores the original address after the passthru vlan is uninitialized.

In `macvlan_fdb_add` and `macvlan_fdb_del`, the condition now explicitly excludes the passthru mode, indicating that FDB handling is different for passthru devices.

`macvlan_common_newlink` is where things get interesting regarding passthru and source mode. Now, there are explicit checks to ensure that a passthru mode device is created first and that only one passthru device is allowed. It also seems now you cannot add a passthru device to existing source mode devices. It looks like it's enforcing a specific order or hierarchy. `macvlan_handle_frame` now expects the passthru device to be first in the list, if there is one.

`macvlan_changelink` introduces checks to prevent dynamically changing the mode of a passthru interface, which makes sense. There's also a source mode flush to handle mode changes more carefully.

Finally, in `macvlan_device_event`, the code now checks again if the interface mode is passthru, which is a good defensive programming approach. This is to validate the interface mode if a passthru interface is removed.

Overall, these changes indicate a refinement of the passthru mode's behavior. They seem to focus on more robust MAC address management and better interaction with source mode MACVLANs. The shift of the lower device MAC restoration and the added checks for mode combinations look like the most important adjustments. Now, let me read `macvlan_handle_frame` to understand how these modes treat their packets.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 460,
  "LineCount": 80
}

{
  "Contents": " 460:\t\treturn consume;\n 461:\t}\n 462:\t\n 463:\t/* called under rcu_read_lock() from netif_receive_skb */\n 464:\tstatic rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)\n 465:\t{\n 466:\t\tstruct macvlan_port *port;\n 467:\t\tstruct sk_buff *skb = *pskb;\n 468:\t\tconst struct ethhdr *eth = eth_hdr(skb);\n 469:\t\tconst struct macvlan_dev *vlan;\n 470:\t\tconst struct macvlan_dev *src;\n 471:\t\tstruct net_device *dev;\n 472:\t\tunsigned int len = 0;\n 473:\t\tint ret;\n 474:\t\trx_handler_result_t handle_res;\n 475:\t\n 476:\t\t/* Packets from dev_loopback_xmit() do not have L2 header, bail out */\n 477:\t\tif (unlikely(skb-\u003epkt_type == PACKET_LOOPBACK))\n 478:\t\t\treturn RX_HANDLER_PASS;\n 479:\t\n 480:\t\tport = macvlan_port_get_rcu(skb-\u003edev);\n 481:\t\tif (is_multicast_ether_addr(eth-\u003eh_dest)) {\n 482:\t\t\tunsigned int hash;\n 483:\t\n 484:\t\t\tskb = ip_check_defrag(dev_net(skb-\u003edev), skb, IP_DEFRAG_MACVLAN);\n 485:\t\t\tif (!skb)\n 486:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 487:\t\t\t*pskb = skb;\n 488:\t\t\teth = eth_hdr(skb);\n 489:\t\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 490:\t\t\t\tkfree_skb(skb);\n 491:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 492:\t\t\t}\n 493:\t\t\tsrc = macvlan_hash_lookup(port, eth-\u003eh_source);\n 494:\t\t\tif (src) {\n 495:\t\t\t\tenum macvlan_mode mode = READ_ONCE(src-\u003emode);\n 496:\t\n 497:\t\t\t\tif (mode != MACVLAN_MODE_VEPA \u0026\u0026\n 498:\t\t\t\t    mode != MACVLAN_MODE_BRIDGE) {\n 499:\t\t\t\t\t/* forward to original port. */\n 500:\t\t\t\t\tvlan = src;\n 501:\t\t\t\t\tret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:\n 502:\t\t\t\t\t      __netif_rx(skb);\n 503:\t\t\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 504:\t\t\t\t\tgoto out;\n 505:\t\t\t\t}\n 506:\t\t\t}\n 507:\t\n 508:\t\t\thash = mc_hash(NULL, eth-\u003eh_dest);\n 509:\t\t\tif (test_bit(hash, port-\u003ebc_filter))\n 510:\t\t\t\tmacvlan_broadcast_enqueue(port, src, skb);\n 511:\t\t\telse if (test_bit(hash, port-\u003emc_filter))\n 512:\t\t\t\tmacvlan_multicast_rx(port, src, skb);\n 513:\t\n 514:\t\t\treturn RX_HANDLER_PASS;\n 515:\t\t}\n 516:\t\n 517:\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 518:\t\t\tkfree_skb(skb);\n 519:\t\t\treturn RX_HANDLER_CONSUMED;\n 520:\t\t}\n 521:\t\tif (macvlan_passthru(port))\n 522:\t\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\n 523:\t\t\t\t\t\t      struct macvlan_dev, list);\n 524:\t\telse\n 525:\t\t\tvlan = macvlan_hash_lookup(port, eth-\u003eh_dest);\n 526:\t\tif (!vlan || READ_ONCE(vlan-\u003emode) == MACVLAN_MODE_SOURCE)\n 527:\t\t\treturn RX_HANDLER_PASS;\n 528:\t\n 529:\t\tdev = vlan-\u003edev;\n 530:\t\tif (unlikely(!(dev-\u003eflags \u0026 IFF_UP))) {\n 531:\t\t\tkfree_skb(skb);\n 532:\t\t\treturn RX_HANDLER_CONSUMED;\n 533:\t\t}\n 534:\t\tlen = skb-\u003elen + ETH_HLEN;\n 535:\t\tskb = skb_share_check(skb, GFP_ATOMIC);\n 536:\t\tif (!skb) {\n 537:\t\t\tret = NET_RX_DROP;\n 538:\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 539:\t\t\tgoto out;\n"
}

							input: 27402
							output: 37
							thoughts: 369

**Analyzing Potential MACVLAN Passthru Device Issue**

Okay, let's take a look at this `macvlan_handle_frame` function. It seems pretty straightforward: if it's a passthru port, it grabs the first VLAN from the list. The recent patch changed how VLANs are added, specifically in `macvlan_common_newlink`. I see the logic now – the passthru device *must* be added first. It makes sense, as `macvlan_handle_frame` seems to be relying on that order. It sets the passthru flag if it’s enabled, then adds it at the head of the list. If it isn't a passthru device it is added at the tail.

Now, my concern is around the uninitialization path in `macvlan_uninit`. It's removing the sources, decrementing the counter, and then… if it's a passthru VLAN, it clears the passthru flag. Okay. But… where's the `list_del_rcu(&vlan->list)` call? I don't see it explicitly removing the VLAN from the list after clearing the passthru flag. Shouldn't that be there? It could be important, but maybe there is another mechanism that deletes it? I'm going to have to dive into `macvlan.c` around `macvlan_uninit` and find out what's going on, and if I missed something in my initial assessment. I need to make sure this isn't going to cause a leak or other unexpected behavior with this passthru device.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 960,
  "LineCount": 45
}

{
  "Contents": " 960:\t\tnetif_inherit_tso_max(dev, lowerdev);\n 961:\t\tdev-\u003ehard_header_len\t= lowerdev-\u003ehard_header_len;\n 962:\t\tdev-\u003eneeded_headroom\t= lowerdev-\u003eneeded_headroom;\n 963:\t\tdev-\u003eneeded_tailroom\t= lowerdev-\u003eneeded_tailroom;\n 964:\t\tmacvlan_set_lockdep_class(dev);\n 965:\t\n 966:\t\tvlan-\u003epcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);\n 967:\t\tif (!vlan-\u003epcpu_stats)\n 968:\t\t\treturn -ENOMEM;\n 969:\t\n 970:\t\tport-\u003ecount += 1;\n 971:\t\n 972:\t\t/* Get macvlan's reference to lowerdev */\n 973:\t\tnetdev_hold(lowerdev, \u0026vlan-\u003edev_tracker, GFP_KERNEL);\n 974:\t\n 975:\t\treturn 0;\n 976:\t}\n 977:\t\n 978:\tstatic void macvlan_uninit(struct net_device *dev)\n 979:\t{\n 980:\t\tstruct macvlan_dev *vlan = netdev_priv(dev);\n 981:\t\tstruct macvlan_port *port = vlan-\u003eport;\n 982:\t\n 983:\t\tfree_percpu(vlan-\u003epcpu_stats);\n 984:\t\n 985:\t\tmacvlan_flush_sources(port, vlan);\n 986:\t\tport-\u003ecount -= 1;\n 987:\t\n 988:\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n 989:\t\t\t/* If the lower device address has been changed by passthru\n 990:\t\t\t * macvlan, put it back.\n 991:\t\t\t *\n 992:\t\t\t * Caution: This triggers NETDEV_CHANGEADDR on\n 993:\t\t\t * the lower device. But we're in the green because\n 994:\t\t\t * the passthru interface is already off the list.\n 995:\t\t\t */\n 996:\t\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n 997:\t\t\t\tstruct sockaddr_storage ss;\n 998:\t\n 999:\t\t\t\tss.ss_family = port-\u003edev-\u003etype;\n1000:\t\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n1001:\t\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n1002:\t\t\t}\n1003:\t\t\tmacvlan_clear_passthru(port);\n1004:\t\t}\n"
}

							input: 28903
							output: 38
							thoughts: 30

Here's my take on those thoughts:

**Analyzing `list_del` in `vlan->list`**

Okay, hold on a second. I need to trace the lifecycle of this VLAN structure. The core question is: where exactly is the critical removal operation, `list_del`, performed on `vlan->list`? It's essential to understand the complete link lifecycle and tear-down sequence. Since I know this code, my first instinct is that it's likely handled within `macvlan_dellink`. I need to confirm that suspicion, however, I'll start checking there.

{
  "Expression": "list_del.*vlans|vlans",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=44=struct macvlan_port {\n--\ndrivers/net/macvlan.c-46-\tstruct hlist_head\tvlan_hash[MACVLAN_HASH_SIZE];\ndrivers/net/macvlan.c:47:\tstruct list_head\tvlans;\ndrivers/net/macvlan.c-48-\tstruct sk_buff_head\tbc_queue;\n--\ndrivers/net/macvlan.c=464=static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)\n--\ndrivers/net/macvlan.c-521-\tif (macvlan_passthru(port))\ndrivers/net/macvlan.c:522:\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\ndrivers/net/macvlan.c-523-\t\t\t\t\t      struct macvlan_dev, list);\n--\ndrivers/net/macvlan.c=1278=static int macvlan_port_create(struct net_device *dev)\n--\ndrivers/net/macvlan.c-1295-\tether_addr_copy(port-\u003eperm_addr, dev-\u003edev_addr);\ndrivers/net/macvlan.c:1296:\tINIT_LIST_HEAD(\u0026port-\u003evlans);\ndrivers/net/macvlan.c-1297-\tfor (i = 0; i \u003c MACVLAN_HASH_SIZE; i++)\n--\ndrivers/net/macvlan.c=1485=int macvlan_common_newlink(struct net_device *dev,\n--\ndrivers/net/macvlan.c-1505-\ndrivers/net/macvlan.c:1506:\t/* When creating macvlans or macvtaps on top of other macvlans - use\ndrivers/net/macvlan.c-1507-\t * the real device as the lowerdev.\n--\ndrivers/net/macvlan.c-1568-\ndrivers/net/macvlan.c:1569:\t\tlist_for_each_entry(p, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1570-\t\t\tif (p-\u003emode != MACVLAN_MODE_SOURCE) {\n--\ndrivers/net/macvlan.c-1608-\t\tmacvlan_set_passthru(port);\ndrivers/net/macvlan.c:1609:\t\tlist_add_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\ndrivers/net/macvlan.c-1610-\t} else\ndrivers/net/macvlan.c:1611:\t\tlist_add_tail_rcu(\u0026vlan-\u003elist, \u0026port-\u003evlans);\ndrivers/net/macvlan.c-1612-\tupdate_port_bc_queue_len(vlan-\u003eport);\n--\ndrivers/net/macvlan.c=1876=static void update_port_bc_queue_len(struct macvlan_port *port)\n--\ndrivers/net/macvlan.c-1880-\ndrivers/net/macvlan.c:1881:\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1882-\t\tif (vlan-\u003ebc_queue_len_req \u003e max_bc_queue_len_req)\n--\ndrivers/net/macvlan.c=1888=static int macvlan_device_event(struct notifier_block *unused,\n--\ndrivers/net/macvlan.c-1904-\tcase NETDEV_CHANGE:\ndrivers/net/macvlan.c:1905:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1906-\t\t\tnetif_stacked_transfer_operstate(vlan-\u003elowerdev,\n--\ndrivers/net/macvlan.c-1909-\tcase NETDEV_FEAT_CHANGE:\ndrivers/net/macvlan.c:1910:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1911-\t\t\tnetif_inherit_tso_max(vlan-\u003edev, dev);\n--\ndrivers/net/macvlan.c-1917-\tcase NETDEV_CHANGEMTU:\ndrivers/net/macvlan.c:1918:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list) {\ndrivers/net/macvlan.c-1919-\t\t\tif (vlan-\u003edev-\u003emtu \u003c= dev-\u003emtu)\n--\ndrivers/net/macvlan.c-1927-\ndrivers/net/macvlan.c:1928:\t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\ndrivers/net/macvlan.c-1929-\t\t\t\t\t\tstruct macvlan_dev,\n--\ndrivers/net/macvlan.c-1946-\ndrivers/net/macvlan.c:1947:\t\tlist_for_each_entry_safe(vlan, next, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1948-\t\t\tvlan-\u003edev-\u003ertnl_link_ops-\u003edellink(vlan-\u003edev, \u0026list_kill);\n--\ndrivers/net/macvlan.c-1957-\tcase NETDEV_RESEND_IGMP:\ndrivers/net/macvlan.c:1958:\t\t/* Propagate to all vlans */\ndrivers/net/macvlan.c:1959:\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\ndrivers/net/macvlan.c-1960-\t\t\tcall_netdevice_notifiers(event, vlan-\u003edev);\n"
}

							input: 30598
							output: 32
							thoughts: 16

Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert:

**Tracing the Macvlan `dellink` Definition**

Alright, let's dive right in. My first thought is to pinpoint where the `dellink` function is defined specifically within the context of macvlan. I want the exact location of the implementation, not just vague references. This means I'm going to need to start digging into the codebase. I need to understand how the macvlan driver is structured. I need the specifics so that I can understand how this function operates in the grand scheme. My goal is clarity. I need to be able to follow the logic and understand the purpose and implications of what is happening.

{
  "Expression": "\\.dellink",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=1867=static struct rtnl_link_ops macvlan_link_ops = {\n--\ndrivers/net/macvlan.c-1870-\t.newlink\t= macvlan_newlink,\ndrivers/net/macvlan.c:1871:\t.dellink\t= macvlan_dellink,\ndrivers/net/macvlan.c-1872-\t.get_link_net\t= macvlan_get_link_net,\n"
}

							input: 30944
							output: 35
							thoughts: 12

Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it were my own internal monologue:

**Diving into `macvlan_dellink`**

Alright, let's take a look at `macvlan_dellink`. I'm immediately thinking, this is probably a utility, a script, or at least a specific code block dealing with the delinking aspect of Macvlan interfaces. Given the naming convention, it suggests a function to remove the association between a physical NIC and a virtual Macvlan interface. I'm already anticipating the typical considerations: are we talking about the simple removal of an IP address and MAC address association, or is there a more thorough unbinding involved, potentially requiring some kind of cleanup or resource release on the underlying physical interface?

I need to quickly assess its scope. Does it encompass potential error handling? Is it a barebones tool or does it consider situations like a partially configured Macvlan interface, or perhaps attempts to unlink a Macvlan interface that's still actively in use. My brain is already starting to formulate questions about its implementation: Is it using `ip` commands, netlink, or a more specialized driver interface? What are the implications for network traffic? Does it gracefully handle the "down" state of the Macvlan before removing the link?

I need to understand its impact on the host network stack as a whole. This is going to play into any troubleshooting I might have to do later. So, I need to see what's actually *happening* when this script/utility executes. What logs it produces (if any)? Does it follow established best practices? Given my experience, I can already think of scenarios where a poorly implemented "dellink" could lead to connectivity issues or even instability. So, let's see what's under the hood and make sure it's up to snuff.

{
  "Expression": "macvlan_dellink",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=1640=static int macvlan_newlink(struct net_device *dev,\n--\ndrivers/net/macvlan.c-1646-\ndrivers/net/macvlan.c:1647:void macvlan_dellink(struct net_device *dev, struct list_head *head)\ndrivers/net/macvlan.c-1648-{\n--\ndrivers/net/macvlan.c-1657-}\ndrivers/net/macvlan.c:1658:EXPORT_SYMBOL_GPL(macvlan_dellink);\ndrivers/net/macvlan.c-1659-\n--\ndrivers/net/macvlan.c=1867=static struct rtnl_link_ops macvlan_link_ops = {\n--\ndrivers/net/macvlan.c-1870-\t.newlink\t= macvlan_newlink,\ndrivers/net/macvlan.c:1871:\t.dellink\t= macvlan_dellink,\ndrivers/net/macvlan.c-1872-\t.get_link_net\t= macvlan_get_link_net,\n"
}

							input: 31699
							output: 38
							thoughts: 27

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing macvlan.c: Delving into Packet Reception**

Okay, let's dive into the guts of `drivers/net/macvlan.c`, specifically lines 1645-1665. I'm focusing on that section because I suspect it's where the core packet reception logic for macvlan interfaces resides. I need to refresh my memory on how this driver handles incoming frames and directs them to the appropriate virtual interfaces. I anticipate this code segment will touch upon aspects like VLAN tagging, address filtering, and the crucial `netif_rx()` call. I'm particularly interested in how they've chosen to implement the packet demultiplexing, and if it's optimized for performance and scalability. I'll be looking for any potential bottlenecks or areas where they've made interesting trade-offs between complexity and efficiency. Are they using any hardware offload capabilities? And how robust is the error handling in this section? Time to dig in and see if this implementation lives up to my expectations.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 1645,
  "LineCount": 20
}

{
  "Contents": "1645:\t}\n1646:\t\n1647:\tvoid macvlan_dellink(struct net_device *dev, struct list_head *head)\n1648:\t{\n1649:\t\tstruct macvlan_dev *vlan = netdev_priv(dev);\n1650:\t\n1651:\t\tif (vlan-\u003emode == MACVLAN_MODE_SOURCE)\n1652:\t\t\tmacvlan_flush_sources(vlan-\u003eport, vlan);\n1653:\t\tlist_del_rcu(\u0026vlan-\u003elist);\n1654:\t\tupdate_port_bc_queue_len(vlan-\u003eport);\n1655:\t\tunregister_netdevice_queue(dev, head);\n1656:\t\tnetdev_upper_dev_unlink(vlan-\u003elowerdev, dev);\n1657:\t}\n1658:\tEXPORT_SYMBOL_GPL(macvlan_dellink);\n1659:\t\n1660:\tstatic int macvlan_changelink(struct net_device *dev,\n1661:\t\t\t\t      struct nlattr *tb[], struct nlattr *data[],\n1662:\t\t\t\t      struct netlink_ext_ack *extack)\n1663:\t{\n1664:\t\tstruct macvlan_dev *vlan = netdev_priv(dev);\n"
}

							input: 32353
							output: 38
							thoughts: 469

**My Analysis of the macvlan_uninit Process**

Okay, let's break down what's happening in `macvlan_uninit`. I'm starting from the unregistration of a macvlan interface. The core of this seems to be the `macvlan_dellink` function, which then calls `unregister_netdevice_queue`. Eventually, during the netdevice unregistration process, we hit `macvlan_uninit` via `dev->netdev_ops->ndo_uninit`. That makes sense; it's the cleanup stage.

Inside `macvlan_uninit`, I see this conditional block related to `MACVLAN_MODE_PASSTHRU`. If we're in passthrough mode, the code is trying to restore the original MAC address of the lower device if it's been modified by the passthrough macvlan. The crucial part here is `dev_set_mac_address(port->dev, &ss, NULL)`. I instantly recognize that `dev_set_mac_address` triggers a `NETDEV_CHANGEADDR` event on the underlying device. This is where things get interesting.

That `NETDEV_CHANGEADDR` event is caught by `macvlan_device_event`. When `NETDEV_CHANGEADDR` hits, the code iterates through the `vlans` list associated with the port. And then, there's `macvlan_sync_address`, which I know involves synchronization or update of the mac addresses.

This is all happening during cleanup, after the macvlan interface is off the list. So, the lower device is essentially being cleaned up by restoring the mac address, which is causing a chain of events that could potentially need very careful examination. I should check how these events are handled, especially the consequences of `macvlan_sync_address`.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 1920,
  "LineCount": 40
}

{
  "Contents": "1920:\t\t\t\t\tcontinue;\n1921:\t\t\t\tdev_set_mtu(vlan-\u003edev, dev-\u003emtu);\n1922:\t\t\t}\n1923:\t\t\tbreak;\n1924:\t\tcase NETDEV_CHANGEADDR:\n1925:\t\t\tif (!macvlan_passthru(port))\n1926:\t\t\t\treturn NOTIFY_DONE;\n1927:\t\n1928:\t\t\tvlan = list_first_entry_or_null(\u0026port-\u003evlans,\n1929:\t\t\t\t\t\t\tstruct macvlan_dev,\n1930:\t\t\t\t\t\t\tlist);\n1931:\t\t\t/* Validate the interface mode again because we're potentially\n1932:\t\t\t * triggered upon removal of the passthru interface. In which\n1933:\t\t\t * case it is already off the list (and has restored the lower\n1934:\t\t\t * device mac already).\n1935:\t\t\t */\n1936:\t\t\tif (!vlan || vlan-\u003emode != MACVLAN_MODE_PASSTHRU)\n1937:\t\t\t\treturn NOTIFY_DONE;\n1938:\t\t\tif (macvlan_sync_address(vlan-\u003edev, dev-\u003edev_addr))\n1939:\t\t\t\treturn NOTIFY_BAD;\n1940:\t\n1941:\t\t\tbreak;\n1942:\t\tcase NETDEV_UNREGISTER:\n1943:\t\t\t/* twiddle thumbs on netns device moves */\n1944:\t\t\tif (dev-\u003ereg_state != NETREG_UNREGISTERING)\n1945:\t\t\t\tbreak;\n1946:\t\n1947:\t\t\tlist_for_each_entry_safe(vlan, next, \u0026port-\u003evlans, list)\n1948:\t\t\t\tvlan-\u003edev-\u003ertnl_link_ops-\u003edellink(vlan-\u003edev, \u0026list_kill);\n1949:\t\t\tunregister_netdevice_many(\u0026list_kill);\n1950:\t\t\tbreak;\n1951:\t\tcase NETDEV_PRE_TYPE_CHANGE:\n1952:\t\t\t/* Forbid underlying device to change its type. */\n1953:\t\t\treturn NOTIFY_BAD;\n1954:\t\n1955:\t\tcase NETDEV_NOTIFY_PEERS:\n1956:\t\tcase NETDEV_BONDING_FAILOVER:\n1957:\t\tcase NETDEV_RESEND_IGMP:\n1958:\t\t\t/* Propagate to all vlans */\n1959:\t\t\tlist_for_each_entry(vlan, \u0026port-\u003evlans, list)\n"
}

							input: 33903
							output: 31
							thoughts: 755

**Analyzing the `NETDEV_CHANGEADDR` Issue in macvlan and its Fuzzing Potential**

Okay, let's break this down. It seems there's a potential issue related to `NETDEV_CHANGEADDR` in the macvlan driver, specifically when destroying a passthru interface in conjunction with a source interface. The key is the order of operations in `macvlan_uninit`. We have `macvlan_clear_passthru(port)` happening *after* `dev_set_mac_address(port->dev, &ss, NULL)`. This means that during the `dev_set_mac_address` call, `macvlan_passthru(port)` is *still* true.

Then, we hit `macvlan_device_event` and receive `NETDEV_CHANGEADDR`. The code checks `if (!macvlan_passthru(port)) return NOTIFY_DONE;`, which *passes* because the passthru mode hasn't been completely cleared yet. Now comes the tricky part:  `vlan = list_first_entry_or_null(&port->vlans, struct macvlan_dev, list);`. Since the passthru VLAN was already removed from `port->vlans` in `macvlan_dellink`, the first entry is now the *source* VLAN, if one exists! So, because `vlan->mode != MACVLAN_MODE_PASSTHRU`, we get `return NOTIFY_DONE;`. Finally, `macvlan_clear_passthru(port)` is called.  This whole lifecycle is a bit convoluted, with multiple calls, and a race condition is implied.

The takeaway?  There's a complex interaction going on here, involving lifecycle management, locking, and the underlying net device. This whole sequence has to be handled carefully. And, given that macvlan is *core networking* and a virtual network device accessible via syzkaller netlink descriptions (`rtnetlink`), it's a prime target for fuzzing.

Now, let's see, according to the fuzzing guidelines (Section 3), the patch touches *reachable executable code* within core networking, which is on the list to be considered for fuzzing. Also, it involves restructuring of data structures. This seems like a slam dunk in terms of worthiness for fuzzing.

My next step is to nail down the configuration requirements. We need `CONFIG_MACVLAN`.  Let me quickly verify if there are any *other* dependencies. Checking `drivers/net/Kconfig`, I see:

```
config MACVLAN
	tristate "MAC-VLAN support"
	help
	  This allows one to create virtual interfaces that map packets to
	  or from specific MAC addresses to a particular interface.
...
```

No direct `depends on` clauses. Okay, looks clean from that perspective. The key thing is that it's accessible via netlink, a virtual network device driver. That makes it a good candidate.

{
  "Expression": "menuconfig|if NET",
  "PathPrefix": "drivers/net/Kconfig"
}

{
  "Output": "drivers/net/Kconfig-5-\ndrivers/net/Kconfig:6:menuconfig NETDEVICES\ndrivers/net/Kconfig-7-\tdefault y if UML\n--\ndrivers/net/Kconfig-26-# that for each of the symbols.\ndrivers/net/Kconfig:27:if NETDEVICES\ndrivers/net/Kconfig-28-\n--\ndrivers/net/Kconfig=32=config NET_CORE\n--\ndrivers/net/Kconfig-38-\ndrivers/net/Kconfig:39:if NET_CORE\ndrivers/net/Kconfig-40-\n"
}

							input: 35496
							output: 27
							thoughts: 44

Okay, here's my take on those thoughts, framed as my own:

**Investigating MACVLAN Configuration**

Alright, let's dive in. I need to figure out if MACVLAN's conditional compilation is nested within the `if NET_CORE` block. That's a common area for networking features, so it's a logical place to start. I'm looking at line 39; yes, that's where the `if NET_CORE` directive begins. Now, MACVLAN itself appears much further down, on line 165. Hmm, that suggests it *could* be inside that block... but I need confirmation. I need to find the corresponding `endif` to determine the scope. I need to trace the boundaries. Where the heck is that closing directive? A quick scan should locate it.

{
  "Expression": "endif",
  "PathPrefix": "drivers/net/Kconfig"
}

{
  "Output": "drivers/net/Kconfig=489=config MHI_NET\n--\ndrivers/net/Kconfig-496-\ndrivers/net/Kconfig:497:endif # NET_CORE\ndrivers/net/Kconfig-498-\n--\ndrivers/net/Kconfig=621=config NET_FAILOVER\n--\ndrivers/net/Kconfig-632-\ndrivers/net/Kconfig:633:endif # NETDEVICES\n"
}

							input: 35867
							output: 36
							thoughts: 216

**Analyzing Networking Configuration and Identifying Focus Symbols**

Okay, so I'm looking at these networking configurations. It seems like `NETDEVICES` and `NET_CORE` are pretty standard, usually implied by `NET`, but it's important to list `MACVLAN` explicitly if that's relevant, or maybe just mention `MACVLAN` on its own. I should double-check that by explicitly listing `NETDEVICES`, `NET_CORE`, and `MACVLAN`. I need to be sure; does syzkaller play nice with these? The standard x86_64 defconfig seems to have `CONFIG_NETDEVICES=y` and `CONFIG_NET_CORE=y`, so definitely listing `MACVLAN` is essential here.

Alright, moving on to identifying the critical symbols, the "FocusSymbols" as I like to think of them. I'm going to review the functions this patch modifies. First, there's `macvlan_clear_passthru`. Hmm, it's `static inline`, which means it won't have a distinct symbol address in the vmlinux image. Okay, noted. Next, `macvlan_addr_busy` - it's a `static bool` function. The key here is to determine if `macvlan_addr_busy` is inlined or static. That's the important piece of information I need.

{
  "Expression": "macvlan_addr_busy",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=207=static void macvlan_hash_change_addr(struct macvlan_dev *vlan,\n--\ndrivers/net/macvlan.c-217-\ndrivers/net/macvlan.c:218:static bool macvlan_addr_busy(const struct macvlan_port *port,\ndrivers/net/macvlan.c-219-\t\t\t      const unsigned char *addr)\n--\ndrivers/net/macvlan.c=638=static int macvlan_open(struct net_device *dev)\n--\ndrivers/net/macvlan.c-653-\terr = -EADDRINUSE;\ndrivers/net/macvlan.c:654:\tif (macvlan_addr_busy(vlan-\u003eport, dev-\u003edev_addr))\ndrivers/net/macvlan.c-655-\t\tgoto out;\n--\ndrivers/net/macvlan.c=738=static int macvlan_sync_address(struct net_device *dev,\n--\ndrivers/net/macvlan.c-752-\t\t\t/* Rehash and update the device filters */\ndrivers/net/macvlan.c:753:\t\t\tif (macvlan_addr_busy(vlan-\u003eport, addr))\ndrivers/net/macvlan.c-754-\t\t\t\t\treturn -EADDRINUSE;\n--\ndrivers/net/macvlan.c=777=static int macvlan_set_mac_address(struct net_device *dev, void *p)\n--\ndrivers/net/macvlan.c-793-\ndrivers/net/macvlan.c:794:\tif (macvlan_addr_busy(vlan-\u003eport, addr-\u003e__data))\ndrivers/net/macvlan.c-795-\t\treturn -EADDRINUSE;\n"
}

							input: 36890
							output: 264
							thoughts: 1267

**Analysis of macvlan.c Patch for Fuzzing**

Alright, let's break down this `macvlan.c` patch and see if it's fuzz-worthy. My first step is to quickly identify all the modified functions in the driver. I see these: `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_uninit`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_port_destroy`, `macvlan_common_newlink`, `macvlan_changelink`, and `macvlan_device_event`.

Now, the question is, are any of these lifecycle hot-paths that are ubiquitous? No, these all seem specific to macvlan operations, netdev ops, link ops, event notifier, and fdb ops. Good, that narrows down the scope. I'll quickly confirm each function and its location, just to be sure: `macvlan_common_newlink`, `macvlan_changelink`, `macvlan_uninit`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_device_event`, `macvlan_fdb_add`, `macvlan_fdb_del`, `macvlan_addr_busy`, and `macvlan_port_destroy`, all present and accounted for in `drivers/net/macvlan.c`.

Okay, next I need to understand the core logic change. This patch is enabling the mixing of `MACVLAN_MODE_PASSTHRU` and `MACVLAN_MODE_SOURCE` devices on the same underlying interface. Previously, only one macvlan device was allowed in passthru mode. So, the patch seems to adjust the following:

1. `macvlan_common_newlink`: It now allows creating source mode devices when passthru exists, or passthru when only source devices are present.
2. `macvlan_changelink`: Prevents mode changes between passthru/source.
3. `macvlan_uninit`: Cleans up passthru state when the passthru device is uninitialized and restores the lower device MAC address (which fires NETDEV\_CHANGEADDR).
4. `macvlan_device_event`: Handles `NETDEV_CHANGEADDR` when passthru interface is uninit/removed.
5. `macvlan_sync_address`: Checks mode instead of port flags.
6. `macvlan_open` / `macvlan_stop`: Checks vlan mode instead of port flags for promiscuity setting.
7. `macvlan_fdb_add` / `macvlan_fdb_del`: Checks vlan mode instead of port flags for unicast filter support.

These modified functions are feature-specific entry points.

Now, let's see if this patch meets the fuzzing guidelines. First, reachability. Macvlan interfaces are virtual devices created via rtnetlink (`RTM_NEWLINK`), so they're fully reachable, and I can easily test this in QEMU or a standard environment. Excellent, the core logic modified here is reachable. Secondly, is it worth fuzzing? Yes, this change modifies reachable core networking virtual device driver logic and adds complex lifecycle/event handling. It's definitely worth fuzzing. The focus symbols should include the modified, non-ubiquitous functions: `macvlan_common_newlink`, `macvlan_changelink`, `macvlan_uninit`, `macvlan_sync_address`, `macvlan_device_event`, `macvlan_open`, `macvlan_stop`, `macvlan_fdb_add`, and `macvlan_fdb_del`. Finally, for enable configurations, I need `MACVLAN` (as well as `NET_CORE`, `NETDEVICES`).

Everything looks good. It's well-supported, and it's testable. I'm going to set-results.

{
  "EnableConfigs": [
    "MACVLAN"
  ],
  "FocusSymbols": [
    "macvlan_common_newlink",
    "macvlan_changelink",
    "macvlan_uninit",
    "macvlan_sync_address",
    "macvlan_device_event",
    "macvlan_open",
    "macvlan_stop",
    "macvlan_fdb_add",
    "macvlan_fdb_del"
  ],
  "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "MACVLAN"
  ],
  "FocusSymbols": [
    "macvlan_common_newlink",
    "macvlan_changelink",
    "macvlan_uninit",
    "macvlan_sync_address",
    "macvlan_device_event",
    "macvlan_open",
    "macvlan_stop",
    "macvlan_fdb_add",
    "macvlan_fdb_del"
  ],
  "Reasoning": "The patch modifies drivers/net/macvlan.c to allow mixing MACVLAN_MODE_PASSTHRU devices with MACVLAN_MODE_SOURCE devices on the same lower device. It alters the link creation validation (macvlan_common_newlink), changelink rules (macvlan_changelink), open/stop promiscuity configuration, device address synchronization, uninitialization sequence (restoring lower device MAC and clearing passthru flag during macvlan_uninit rather than port destruction), and event handling for NETDEV_CHANGEADDR. These paths are fully reachable from userspace via netlink/rtnetlink in standard virtualized environments and warrant fuzzing.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

{
  "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.

CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
  a comprehensive suite of debugging tools and sanitizers, including KASAN
  (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
  (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
  or page allocations) and kernel-to-user memory info-leaks.

Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.

Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.

Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
   attributes, ioctl output arguments, socket options, or BPF buffers) where fields
   or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
   or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
   could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
   uninitialized bytes of existing buffers.

Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
  dereferences, locking deadlocks, or use-after-free bugs (these are already caught
  by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
  or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.

Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

Target architecture: amd64

For your convenience, here is the diff of the changes:
commit ae294554f8443ffab9a55f91b254932f3354f232
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Sep 19 03:49:24 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index afad90b9222a2..76c11e5260334 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -83,6 +83,11 @@ static inline void macvlan_set_passthru(struct macvlan_port *port)
 	port->flags |= MACVLAN_F_PASSTHRU;
 }
 
+static inline void macvlan_clear_passthru(struct macvlan_port *port)
+{
+	port->flags &= ~MACVLAN_F_PASSTHRU;
+}
+
 static inline bool macvlan_addr_change(const struct macvlan_port *port)
 {
 	return port->flags & MACVLAN_F_ADDRCHANGE;
@@ -217,8 +222,7 @@ static bool macvlan_addr_busy(const struct macvlan_port *port,
 	 * currently in use by the underlying device or
 	 * another macvlan.
 	 */
-	if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
-	    ether_addr_equal_64bits(port->dev->dev_addr, addr))
+	if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
 		return true;
 
 	if (macvlan_hash_lookup(port, addr))
@@ -637,7 +641,7 @@ static int macvlan_open(struct net_device *dev)
 	struct net_device *lowerdev = vlan->lowerdev;
 	int err;
 
-	if (macvlan_passthru(vlan->port)) {
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
 			err = dev_set_promiscuity(lowerdev, 1);
 			if (err < 0)
@@ -712,7 +716,7 @@ static int macvlan_stop(struct net_device *dev)
 	dev_uc_unsync(lowerdev, dev);
 	dev_mc_unsync(lowerdev, dev);
 
-	if (macvlan_passthru(vlan->port)) {
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
 		if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
 			dev_set_promiscuity(lowerdev, -1);
 		goto hash_del;
@@ -737,17 +741,18 @@ static int macvlan_sync_address(struct net_device *dev,
 	struct macvlan_dev *vlan = netdev_priv(dev);
 	struct net_device *lowerdev = vlan->lowerdev;
 	struct macvlan_port *port = vlan->port;
+	bool passthru_dev = vlan->mode == MACVLAN_MODE_PASSTHRU;
 	int err;
 
 	if (!(dev->flags & IFF_UP)) {
 		/* Just copy in the new address */
 		eth_hw_addr_set(dev, addr);
 	} else {
-		/* Rehash and update the device filters */
-		if (macvlan_addr_busy(vlan->port, addr))
-			return -EADDRINUSE;
+		if (!passthru_dev) {
+			/* Rehash and update the device filters */
+			if (macvlan_addr_busy(vlan->port, addr))
+					return -EADDRINUSE;
 
-		if (!macvlan_passthru(port)) {
 			err = dev_uc_add(lowerdev, addr);
 			if (err)
 				return err;
@@ -757,7 +762,7 @@ static int macvlan_sync_address(struct net_device *dev,
 
 		macvlan_hash_change_addr(vlan, addr);
 	}
-	if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
+	if (passthru_dev && !macvlan_addr_change(port)) {
 		/* Since addr_change isn't set, we are here due to lower
 		 * device change.  Save the lower-dev address so we can
 		 * restore it later.
@@ -979,7 +984,26 @@ static void macvlan_uninit(struct net_device *dev)
 
 	macvlan_flush_sources(port, vlan);
 	port->count -= 1;
-	if (!port->count)
+
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		/* If the lower device address has been changed by passthru
+		 * macvlan, put it back.
+		 *
+		 * Caution: This triggers NETDEV_CHANGEADDR on
+		 * the lower device. But we're in the green because
+		 * the passthru interface is already off the list.
+		 */
+		if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
+			struct sockaddr_storage ss;
+
+			ss.ss_family = port->dev->type;
+			memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
+			dev_set_mac_address(port->dev, &ss, NULL);
+		}
+		macvlan_clear_passthru(port);
+	}
+
+	if (port->count == 0)
 		macvlan_port_destroy(port->dev);
 }
 
@@ -1054,7 +1078,7 @@ static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 	/* Support unicast filter only on passthru devices.
 	 * Multicast filter should be allowed on all devices.
 	 */
-	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+	if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr))
 		return -EOPNOTSUPP;
 
 	if (flags & NLM_F_REPLACE)
@@ -1079,7 +1103,7 @@ static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 	/* Support unicast filter only on passthru devices.
 	 * Multicast filter should be allowed on all devices.
 	 */
-	if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
+	if (vlan->mode != MACVLAN_MODE_PASSTHRU && is_unicast_ether_addr(addr))
 		return -EOPNOTSUPP;
 
 	if (is_unicast_ether_addr(addr))
@@ -1310,18 +1334,6 @@ static void macvlan_port_destroy(struct net_device *dev)
 		kfree_skb(skb);
 	}
 
-	/* If the lower device address has been changed by passthru
-	 * macvlan, put it back.
-	 */
-	if (macvlan_passthru(port) &&
-	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
-		struct sockaddr_storage ss;
-
-		ss.ss_family = port->dev->type;
-		memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
-		dev_set_mac_address(port->dev, &ss, NULL);
-	}
-
 	kfree(port);
 }
 
@@ -1523,15 +1535,6 @@ int macvlan_common_newlink(struct net_device *dev,
 	}
 	port = macvlan_port_get_rtnl(lowerdev);
 
-	/* Only 1 macvlan device can be created in passthru mode */
-	if (macvlan_passthru(port)) {
-		/* The macvlan port must be not created this time,
-		 * still goto destroy_macvlan_port for readability.
-		 */
-		err = -EINVAL;
-		goto destroy_macvlan_port;
-	}
-
 	vlan->lowerdev = lowerdev;
 	vlan->dev      = dev;
 	vlan->port     = port;
@@ -1544,12 +1547,31 @@ int macvlan_common_newlink(struct net_device *dev,
 	if (data && data[IFLA_MACVLAN_FLAGS])
 		vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 
+	/* Only 1 macvlan device can be created in passthru mode. There may be
+	 * additional source mode devices but nothing else at the moment.
+	 *
+	 * First check if adding a source mode device to an existing passthru vlan.
+	 */
+	if (macvlan_passthru(port) && vlan->mode != MACVLAN_MODE_SOURCE) {
+		/* The macvlan port must be not created this time,
+		 * still goto destroy_macvlan_port for readability.
+		 */
+		err = -EINVAL;
+		goto destroy_macvlan_port;
+	}
+
+	/* Now check if adding a passthru device to an existing set of source mode
+	 * devices.
+	 */
 	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
-		if (port->count) {
-			err = -EINVAL;
-			goto destroy_macvlan_port;
+		struct macvlan_dev *p;
+
+		list_for_each_entry(p, &port->vlans, list) {
+			if (p->mode != MACVLAN_MODE_SOURCE) {
+				err = -EINVAL;
+				goto destroy_macvlan_port;
+			}
 		}
-		macvlan_set_passthru(port);
 		eth_hw_addr_inherit(dev, lowerdev);
 	}
 
@@ -1581,7 +1603,12 @@ int macvlan_common_newlink(struct net_device *dev,
 	if (err)
 		goto unregister_netdev;
 
-	list_add_tail_rcu(&vlan->list, &port->vlans);
+	/* macvlan_handle_frame expects the (one and only) passthru device first. */
+	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
+		macvlan_set_passthru(port);
+		list_add_rcu(&vlan->list, &port->vlans);
+	} else
+		list_add_tail_rcu(&vlan->list, &port->vlans);
 	update_port_bc_queue_len(vlan->port);
 	netif_stacked_transfer_operstate(lowerdev, dev);
 	linkwatch_fire_event(dev);
@@ -1652,19 +1679,23 @@ static int macvlan_changelink(struct net_device *dev,
 	if (data && data[IFLA_MACVLAN_MODE]) {
 		set_mode = true;
 		mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
-		/* Passthrough mode can't be set or cleared dynamically */
-		if ((mode == MACVLAN_MODE_PASSTHRU) !=
-		    (vlan->mode == MACVLAN_MODE_PASSTHRU))
-			return -EINVAL;
-		if (vlan->mode == MACVLAN_MODE_SOURCE &&
-		    vlan->mode != mode)
-			macvlan_flush_sources(vlan->port, vlan);
+		if (mode != vlan->mode) {
+			/* Passthrough mode can't be set or cleared dynamically,
+			 * regardless of existing source interfaces. Furthermore, source
+			 * interfaces can't switch modes within a passhtrough port.
+			 */
+			if (vlan->mode == MACVLAN_MODE_PASSTHRU ||
+			    macvlan_passthru(vlan->port))
+				return -EINVAL;
+			if (vlan->mode == MACVLAN_MODE_SOURCE)
+				macvlan_flush_sources(vlan->port, vlan);
+		}
 	}
 
 	if (data && data[IFLA_MACVLAN_FLAGS]) {
 		__u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
 		bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
-		if (macvlan_passthru(vlan->port) && promisc) {
+		if (vlan->mode == MACVLAN_MODE_PASSTHRU && promisc) {
 			int err;
 
 			if (flags & MACVLAN_FLAG_NOPROMISC)
@@ -1897,8 +1928,14 @@ static int macvlan_device_event(struct notifier_block *unused,
 		vlan = list_first_entry_or_null(&port->vlans,
 						struct macvlan_dev,
 						list);
-
-		if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
+		/* Validate the interface mode again because we're potentially
+		 * triggered upon removal of the passthru interface. In which
+		 * case it is already off the list (and has restored the lower
+		 * device mac already).
+		 */
+		if (!vlan || vlan->mode != MACVLAN_MODE_PASSTHRU)
+			return NOTIFY_DONE;
+		if (macvlan_sync_address(vlan->dev, dev->dev_addr))
 			return NOTIFY_BAD;
 
 		break;

							input: 5508
							output: 22
							thoughts: 982

**KMSAN Analysis of macvlan.c Patch**

Okay, let's break this down. The task is to determine if these changes in `drivers/net/macvlan.c` warrant a dedicated KMSAN fuzzing session, or if standard KASAN and other detectors are sufficient. The guiding principle is clear: if a bug can be caught by KASAN, LOCKDEP, or similar, KMSAN is not needed. KMSAN is only justified for uninitialized memory risks.

First, I need to understand what this patch does. It looks like it's primarily refactoring some passthrough mode logic in macvlan, including the introduction of `macvlan_clear_passthru()`. The diff shows changes in `macvlan_addr_busy`, `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, and a significant move of code in `macvlan_uninit` related to restoring the lower device's MAC address in passthrough mode.

Specifically, the code that caught my attention is the moved MAC address restoration within `macvlan_uninit`. It restores the lower device's MAC address if it's been modified by the macvlan in passthrough mode:

```c
	if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
		// ...
		if(!ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
			struct sockaddr_storage ss;

			ss.ss_family = port->dev->type;
			memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
			dev_set_mac_address(port->dev, &ss, NULL);
		}
		macvlan_clear_passthru(port);
	}
```

Now, the `struct sockaddr_storage ss;` is the critical part. My immediate thought is, is this `ss` properly initialized? The concern is that `dev_set_mac_address` is called with this variable, and I need to ensure it's safe. While the code *seems* to initialize it, I need to confirm the use case with the kernel. I immediately think that `dev_set_mac_address` takes `struct sockaddr *`, so I'll need to double check the implementation or callers. I will use `grepper` to search for usages and definitions to verify the expected behavior and initialization of `ss`.

Based on this immediate review, I'm leaning towards *potentially* needing KMSAN. The move of this code section is the key point. If uninitialized memory from `ss` could leak to `dev_set_mac_address`, then we have a classic KMSAN scenario. A false positive is a waste of time, so I will now *thoroughly* investigate the context and usages of `dev_set_mac_address` to eliminate any possible false positives before making my decision. I need to be sure that standard bug detectors will *not* catch any possible issues here.

{
  "Expression": "int dev_set_mac_address"
}

{
  "Output": "include/linux/netdevice.h=4411=int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\ninclude/linux/netdevice.h-4412-\t\t\t  struct netlink_ext_ack *extack);\ninclude/linux/netdevice.h:4413:int dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\ninclude/linux/netdevice.h-4414-\t\t\tstruct netlink_ext_ack *extack);\ninclude/linux/netdevice.h:4415:int dev_set_mac_address_user(struct net_device *dev, struct sockaddr_storage *ss,\ninclude/linux/netdevice.h-4416-\t\t\t     struct netlink_ext_ack *extack);\n--\nnet/core/dev_api.c=81=void dev_set_group(struct net_device *dev, int new_group)\n--\nnet/core/dev_api.c-87-\nnet/core/dev_api.c:88:int dev_set_mac_address_user(struct net_device *dev,\nnet/core/dev_api.c-89-\t\t\t     struct sockaddr_storage *ss,\n--\nnet/core/dev_api.c=321=EXPORT_SYMBOL(dev_set_allmulti);\n--\nnet/core/dev_api.c-332- */\nnet/core/dev_api.c:333:int dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\nnet/core/dev_api.c-334-\t\t\tstruct netlink_ext_ack *extack)\n"
}

							input: 7605
							output: 37
							thoughts: 27

Here's a summary of my thought process, as requested:

**Diving into `dev_api.c`**

Alright, let's get down to brass tacks. I need to take a look at the `net/core/dev_api.c` file. Specifically, I'm zeroing in on the area around line 333. I'm going to use the `read-file` command, which is a straightforward approach. No need to overcomplicate things; I want a direct inspection of that section of code to understand what's happening. I'll be keeping an eye out for how this section relates to the larger context. This should provide the information I'm looking for.

{
  "File": "net/core/dev_api.c",
  "FirstLine": 330,
  "LineCount": 40
}

{
  "Contents": " 330:\t *\n 331:\t * Return: 0 on success, -errno on failure.\n 332:\t */\n 333:\tint dev_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\n 334:\t\t\t\tstruct netlink_ext_ack *extack)\n 335:\t{\n 336:\t\tint ret;\n 337:\t\n 338:\t\tnetdev_lock_ops(dev);\n 339:\t\tret = netif_set_mac_address(dev, ss, extack);\n 340:\t\tnetdev_unlock_ops(dev);\n 341:\t\n 342:\t\treturn ret;\n 343:\t}\n 344:\tEXPORT_SYMBOL(dev_set_mac_address);\n 345:\t\n 346:\tint dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf)\n 347:\t{\n 348:\t\tint ret;\n 349:\t\n 350:\t\tnetdev_lock_ops(dev);\n 351:\t\tret = netif_xdp_propagate(dev, bpf);\n 352:\t\tnetdev_unlock_ops(dev);\n 353:\t\n 354:\t\treturn ret;\n 355:\t}\n 356:\tEXPORT_SYMBOL_GPL(dev_xdp_propagate);\n 357:\t\n 358:\t/**\n 359:\t * netdev_state_change() - device changes state\n 360:\t * @dev: device to cause notification\n 361:\t *\n 362:\t * Called to indicate a device has changed state. This function calls\n 363:\t * the notifier chains for netdev_chain and sends a NEWLINK message\n 364:\t * to the routing socket.\n 365:\t */\n 366:\tvoid netdev_state_change(struct net_device *dev)\n 367:\t{\n 368:\t\tnetdev_lock_ops(dev);\n 369:\t\tnetif_state_change(dev);\n"
}

							input: 8394
							output: 23
							thoughts: 18

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Tracing the MAC Address Assignment**

Okay, so I need to understand the mechanics of how a MAC address is set within this system, specifically, `netif_set_mac_address`. My initial instinct is to pinpoint the exact definition of this function. I'm going to track down the source code for `netif_set_mac_address`. This is going to give me the most granular insight into how the MAC address is being handled. I need to see if it’s a direct hardware manipulation, if there's any bridging or abstraction involved, or if any other side effects are handled within its scope. Understanding this function's internals is key to grasping the overall architecture.

{
  "Expression": "int netif_set_mac_address"
}

{
  "Output": "include/linux/netdevice.h=4409=int netif_pre_changeaddr_notify(struct net_device *dev, const char *addr,\ninclude/linux/netdevice.h-4410-\t\t\t\tstruct netlink_ext_ack *extack);\ninclude/linux/netdevice.h:4411:int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\ninclude/linux/netdevice.h-4412-\t\t\t  struct netlink_ext_ack *extack);\n--\nnet/core/dev.c=10033=EXPORT_SYMBOL_NS_GPL(netif_pre_changeaddr_notify, \"NETDEV_INTERNAL\");\nnet/core/dev.c-10034-\nnet/core/dev.c:10035:int netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\nnet/core/dev.c-10036-\t\t\t  struct netlink_ext_ack *extack)\n"
}

							input: 8864
							output: 37
							thoughts: 22

Here's my summary, as though I'm thinking through this process:

**Diving into the `net/core/dev.c` Abyss**

Okay, time to get to the root of this. My initial gut feeling is pointing me toward a potential issue related to network device handling, and line 10035 in `net/core/dev.c` seems like a logical place to start digging. This is where the core of the network device driver interaction lives, and that line specifically could be involved in… well, a whole host of things. I'm thinking buffer allocation, packet processing, interrupt handling – it could be *anything* tied to the device's operational life. Let’s get that code up and see what's actually happening at that specific point. Hopefully, the surrounding code will give me enough context to understand what’s going on and how it might be contributing to the issue at hand.

{
  "File": "net/core/dev.c",
  "FirstLine": 10035,
  "LineCount": 50
}

{
  "Contents": "10035:\tint netif_set_mac_address(struct net_device *dev, struct sockaddr_storage *ss,\n10036:\t\t\t\t  struct netlink_ext_ack *extack)\n10037:\t{\n10038:\t\tconst struct net_device_ops *ops = dev-\u003enetdev_ops;\n10039:\t\tint err;\n10040:\t\n10041:\t\tif (!ops-\u003endo_set_mac_address)\n10042:\t\t\treturn -EOPNOTSUPP;\n10043:\t\tif (ss-\u003ess_family != dev-\u003etype)\n10044:\t\t\treturn -EINVAL;\n10045:\t\tif (!netif_device_present(dev))\n10046:\t\t\treturn -ENODEV;\n10047:\t\terr = netif_pre_changeaddr_notify(dev, ss-\u003e__data, extack);\n10048:\t\tif (err)\n10049:\t\t\treturn err;\n10050:\t\tif (memcmp(dev-\u003edev_addr, ss-\u003e__data, dev-\u003eaddr_len)) {\n10051:\t\t\terr = ops-\u003endo_set_mac_address(dev, ss);\n10052:\t\t\tif (err)\n10053:\t\t\t\treturn err;\n10054:\t\t}\n10055:\t\tdev-\u003eaddr_assign_type = NET_ADDR_SET;\n10056:\t\tcall_netdevice_notifiers(NETDEV_CHANGEADDR, dev);\n10057:\t\tadd_device_randomness(dev-\u003edev_addr, dev-\u003eaddr_len);\n10058:\t\treturn 0;\n10059:\t}\n10060:\t\n10061:\tDECLARE_RWSEM(dev_addr_sem);\n10062:\t\n10063:\t/* \"sa\" is a true struct sockaddr with limited \"sa_data\" member. */\n10064:\tint netif_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name)\n10065:\t{\n10066:\t\tsize_t size = sizeof(sa-\u003esa_data);\n10067:\t\tstruct net_device *dev;\n10068:\t\tint ret = 0;\n10069:\t\n10070:\t\tdown_read(\u0026dev_addr_sem);\n10071:\t\trcu_read_lock();\n10072:\t\n10073:\t\tdev = dev_get_by_name_rcu(net, dev_name);\n10074:\t\tif (!dev) {\n10075:\t\t\tret = -ENODEV;\n10076:\t\t\tgoto unlock;\n10077:\t\t}\n10078:\t\tif (!dev-\u003eaddr_len)\n10079:\t\t\tmemset(sa-\u003esa_data, 0, size);\n10080:\t\telse\n10081:\t\t\tmemcpy(sa-\u003esa_data, dev-\u003edev_addr,\n10082:\t\t\t       min_t(size_t, size, dev-\u003eaddr_len));\n10083:\t\tsa-\u003esa_family = dev-\u003etype;\n10084:\t\n"
}

							input: 9969
							output: 37
							thoughts: 330

**Analyzing the `macvlan_uninit` Patch**

Okay, so I'm looking at this `struct sockaddr_storage ss;` in `macvlan_uninit`, and I have to ask... wait, didn't I see those *exact* lines somewhere else recently? Specifically, wasn't that the same block of code in `macvlan_port_destroy`? I'm pretty sure it was:

```c
			struct sockaddr_storage ss;

			ss.ss_family = port->dev->type;
			memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
			dev_set_mac_address(port->dev, &ss, NULL);
```

Yep, there it is! The same five lines, previously existing in `macvlan_port_destroy`:

```c
-	if (macvlan_passthru(port) &&
-	    !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
-		struct sockaddr_storage ss;
-
-		ss.ss_family = port->dev->type;
-		memcpy(&ss.__data, port->perm_addr, port->dev->addr_len);
-		dev_set_mac_address(port->dev, &ss, NULL);
-	}
```

So, this patch essentially just *moved* that bit of logic from `macvlan_port_destroy` into `macvlan_uninit`. The question is *why*? What's the rationale behind this refactoring? Time to dig into `drivers/net/macvlan.c` and get the surrounding context. I'll need to read around `macvlan_uninit` and `macvlan_common_newlink` to understand the flow and figure out what this change is trying to achieve.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 975,
  "LineCount": 40
}

{
  "Contents": " 975:\t\treturn 0;\n 976:\t}\n 977:\t\n 978:\tstatic void macvlan_uninit(struct net_device *dev)\n 979:\t{\n 980:\t\tstruct macvlan_dev *vlan = netdev_priv(dev);\n 981:\t\tstruct macvlan_port *port = vlan-\u003eport;\n 982:\t\n 983:\t\tfree_percpu(vlan-\u003epcpu_stats);\n 984:\t\n 985:\t\tmacvlan_flush_sources(port, vlan);\n 986:\t\tport-\u003ecount -= 1;\n 987:\t\n 988:\t\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n 989:\t\t\t/* If the lower device address has been changed by passthru\n 990:\t\t\t * macvlan, put it back.\n 991:\t\t\t *\n 992:\t\t\t * Caution: This triggers NETDEV_CHANGEADDR on\n 993:\t\t\t * the lower device. But we're in the green because\n 994:\t\t\t * the passthru interface is already off the list.\n 995:\t\t\t */\n 996:\t\t\tif(!ether_addr_equal(port-\u003edev-\u003edev_addr, port-\u003eperm_addr)) {\n 997:\t\t\t\tstruct sockaddr_storage ss;\n 998:\t\n 999:\t\t\t\tss.ss_family = port-\u003edev-\u003etype;\n1000:\t\t\t\tmemcpy(\u0026ss.__data, port-\u003eperm_addr, port-\u003edev-\u003eaddr_len);\n1001:\t\t\t\tdev_set_mac_address(port-\u003edev, \u0026ss, NULL);\n1002:\t\t\t}\n1003:\t\t\tmacvlan_clear_passthru(port);\n1004:\t\t}\n1005:\t\n1006:\t\tif (port-\u003ecount == 0)\n1007:\t\t\tmacvlan_port_destroy(port-\u003edev);\n1008:\t}\n1009:\t\n1010:\tstatic void macvlan_dev_get_stats64(struct net_device *dev,\n1011:\t\t\t\t\t    struct rtnl_link_stats64 *stats)\n1012:\t{\n1013:\t\tstruct macvlan_dev *vlan = netdev_priv(dev);\n1014:\t\n"
}

							input: 11377
							output: 21
							thoughts: 1261

**Analyzing the Macvlan Patch for Passthru and Source Mode Combinations**

Okay, let's break this down. First, I'm seeing that this patch fundamentally changes how passthru mode interacts with other macvlan modes. Previously, it was strictly one or the other on a port. You could have a passthru macvlan or multiple source mode macvlans, but never both simultaneously. The key here is the exclusivity – if `macvlan_passthru(port)` was set, no other macvlan device could exist, and if `port->count` wasn't zero, no passthru mode.

Now, we're combining them. The change allows for a single PASSTHRU macvlan alongside multiple SOURCE mode macvlans. This impacts how the port's destruction is handled. Previously, destroying the passthru device would destroy the port (`port->count == 0`), but now, source mode devices might keep the `port->count` > 0, so the port is not destroyed. So, `macvlan_uninit` has been updated to restore the lowerdev MAC and clear `MACVLAN_F_PASSTHRU` if the device being uninitialized is PASSTHRU.

Looking at the code, in `macvlan_addr_busy`, the logic has been simplified because the check for `!macvlan_passthru(port)` is no longer relevant, given the change. And in `macvlan_device_event`, the new logic ensures that the address synchronization only occurs if a PASSTHRU macvlan exists.

Now, my concern is whether any memory could be left uninitialized or read uninitialized. Specifically, I'm focusing on the introduction of the new `struct sockaddr_storage ss;`. Wait a minute, I see that this was NOT new. That structure was already used in `macvlan_port_destroy`, used in the exact same manner.

Okay, let's step back. Does `dev_set_mac_address` read uninitialized memory from `ss`? I have to dive deeper. `netif_set_mac_address`, calls `ops->ndo_set_mac_address`. The usual pattern here is that the MAC address is actually located at the start of `ss->__data`. My grep confirms that `ndo_set_mac_address` receives a `void *` or `struct sockaddr *`. So it looks like everything is in order.

{
  "Expression": "int eth_mac_addr\\("
}

{
  "Output": "include/linux/etherdevice.h=53=void eth_commit_mac_addr_change(struct net_device *dev, void *p);\ninclude/linux/etherdevice.h:54:int eth_mac_addr(struct net_device *dev, void *p);\ninclude/linux/etherdevice.h-55-int eth_validate_addr(struct net_device *dev);\n--\nnet/ethernet/eth.c=295=EXPORT_SYMBOL(eth_commit_mac_addr_change);\n--\nnet/ethernet/eth.c-306- */\nnet/ethernet/eth.c:307:int eth_mac_addr(struct net_device *dev, void *p)\nnet/ethernet/eth.c-308-{\n"
}

							input: 13387
							output: 36
							thoughts: 20

Here's my summary, as though I were thinking through the process:

**Diving into the Ethernet Implementation**

Okay, so I need to get to the bottom of this. Time to dig into the kernel's Ethernet implementation. I remember seeing something peculiar the other day, and now's the time to refresh my memory and understand it thoroughly. Let me start by focusing on `net/ethernet/eth.c`. My instinct tells me that the issue might be related to the core handling of Ethernet frames, so this seems like a solid place to begin my investigation. Specifically, I should check out line 307. That's a reasonable starting point. Let's see what's happening there and see if it makes me think in new directions.

{
  "File": "net/ethernet/eth.c",
  "FirstLine": 305,
  "LineCount": 25
}

{
  "Contents": " 305:\t * for most real devices.\n 306:\t */\n 307:\tint eth_mac_addr(struct net_device *dev, void *p)\n 308:\t{\n 309:\t\tint ret;\n 310:\t\n 311:\t\tret = eth_prepare_mac_addr_change(dev, p);\n 312:\t\tif (ret \u003c 0)\n 313:\t\t\treturn ret;\n 314:\t\teth_commit_mac_addr_change(dev, p);\n 315:\t\treturn 0;\n 316:\t}\n 317:\tEXPORT_SYMBOL(eth_mac_addr);\n 318:\t\n 319:\tint eth_validate_addr(struct net_device *dev)\n 320:\t{\n 321:\t\tif (!is_valid_ether_addr(dev-\u003edev_addr))\n 322:\t\t\treturn -EADDRNOTAVAIL;\n 323:\t\n 324:\t\treturn 0;\n 325:\t}\n 326:\tEXPORT_SYMBOL(eth_validate_addr);\n 327:\t\n 328:\tconst struct header_ops eth_header_ops ____cacheline_aligned = {\n 329:\t\t.create\t\t= eth_header,\n"
}

							input: 13954
							output: 24
							thoughts: 18

Okay, let's dive into this `eth_prepare_mac_addr_change` function. I'm going to quickly get a high-level understanding of its purpose and how it's intended to work. I already know this area, so let's cut to the chase and understand where this fits into the broader picture.

{
  "Expression": "int eth_prepare_mac_addr_change"
}

{
  "Output": "include/linux/etherdevice.h=51=__be16 eth_header_parse_protocol(const struct sk_buff *skb);\ninclude/linux/etherdevice.h:52:int eth_prepare_mac_addr_change(struct net_device *dev, void *p);\ninclude/linux/etherdevice.h-53-void eth_commit_mac_addr_change(struct net_device *dev, void *p);\n--\nnet/ethernet/eth.c=265=EXPORT_SYMBOL(eth_header_parse_protocol);\n--\nnet/ethernet/eth.c-271- */\nnet/ethernet/eth.c:272:int eth_prepare_mac_addr_change(struct net_device *dev, void *p)\nnet/ethernet/eth.c-273-{\n"
}

							input: 14277
							output: 36
							thoughts: 20

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the Ethernet Driver**

Okay, time to dig into the guts of the Ethernet driver. Specifically, I'm heading over to `net/ethernet/eth.c` and zeroing in on line 272. That line number usually points me to some key function or data structure, depending on the particular driver architecture. This is a common location for handling frame reception, transmission setup, or potentially even some crucial register configuration based on my past experience with similar drivers. The context around that line will be crucial, so I'll be sure to parse a few lines above and below to form a complete understanding. Hopefully, the surrounding code provides enough clues to work with the line-272 functionality.

{
  "File": "net/ethernet/eth.c",
  "FirstLine": 272,
  "LineCount": 25
}

{
  "Contents": " 272:\tint eth_prepare_mac_addr_change(struct net_device *dev, void *p)\n 273:\t{\n 274:\t\tstruct sockaddr *addr = p;\n 275:\t\n 276:\t\tif (!(dev-\u003epriv_flags \u0026 IFF_LIVE_ADDR_CHANGE) \u0026\u0026 netif_running(dev))\n 277:\t\t\treturn -EBUSY;\n 278:\t\tif (!is_valid_ether_addr(addr-\u003esa_data))\n 279:\t\t\treturn -EADDRNOTAVAIL;\n 280:\t\treturn 0;\n 281:\t}\n 282:\tEXPORT_SYMBOL(eth_prepare_mac_addr_change);\n 283:\t\n 284:\t/**\n 285:\t * eth_commit_mac_addr_change - commit mac change\n 286:\t * @dev: network device\n 287:\t * @p: socket address\n 288:\t */\n 289:\tvoid eth_commit_mac_addr_change(struct net_device *dev, void *p)\n 290:\t{\n 291:\t\tstruct sockaddr *addr = p;\n 292:\t\n 293:\t\teth_hw_addr_set(dev, addr-\u003esa_data);\n 294:\t}\n 295:\tEXPORT_SYMBOL(eth_commit_mac_addr_change);\n 296:\t\n"
}

							input: 14882
							output: 36
							thoughts: 2728

**Analyzing the MacVLAN Patch: A Deep Dive**

Okay, here's my breakdown of this patch. Seems like we're refining the MacVLAN code, specifically around the interaction between passthru and other modes. Let's walk through it.

First, the initialization code. The `ss.ss_family` and `ss.__data` initialization and usage is straightforward. It was already there and I don't see anything unusual, and it was just moved.

Now, the core changes. The introduction of `MACVLAN_F_PASSTHRU` flags with the `macvlan_set_passthru` and `macvlan_clear_passthru` functions looks like a clean way to manage the passthru state. The `macvlan_addr_busy` function is updated, and it is a little more robust now. The initial conditional check related to the device address has been removed.

The real meat of this change seems to be the careful handling of the `MACVLAN_MODE_PASSTHRU` mode. Replacing `macvlan_passthru(vlan->port)` with `vlan->mode == MACVLAN_MODE_PASSTHRU` in `macvlan_open`, `macvlan_stop`, `macvlan_sync_address`, `macvlan_fdb_add` and `macvlan_fdb_del` is crucial. It ensures that operations specific to passthru mode are only performed by the passthru device itself and it avoids unintentionally modifying the behavior of source devices sharing the same port. Also, it ensures the behaviour is only applied to the passthru device.

In `macvlan_sync_address`, the use of `passthru_dev` to gate logic within `macvlan_sync_address` based on the device's mode is spot on. This prevents unnecessary re-hashing and address updates on the lower device for source mode devices. In the `macvlan_uninit` function we have an important safeguard. If the lower device address has been changed by passthru, it's restored upon uninitialization. That's good.

The `macvlan_common_newlink` changes are significant. We're now explicitly allowing multiple devices on a passthru port, but with clear restrictions: one passthru device and multiple source mode devices. The checks for `vlan->mode` and existing devices ensure we maintain this structure. And the ordering of `list_add_rcu` is interesting, ensuring the passthru device is at the head.

The restrictions in `macvlan_changelink` on mode changes make sense. Passthru mode can't be set or cleared dynamically, and a source interface cannot change its mode within a passthru port. That keeps things predictable.

The `macvlan_device_event` changes also make sense, the validation of the interface mode is critical here. It adds robustness by confirming the device's mode before attempting any action in the unlikely event the passthru interface is already removed.

Finally, in `macvlan_handle_frame`, we're likely making sure that passthru frames and source mode frames are properly handled. However, I can't be sure about this until I read the code. But given the rest of the changes, I'm expecting proper handling.

Overall, this patch looks like a well-thought-out improvement to the MacVLAN implementation, allowing for a more flexible and robust setup with multiple devices on a passthru port while preserving the intended behavior of the system.

{
  "Expression": "macvlan_handle_frame",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=438=static bool macvlan_forward_source(struct sk_buff *skb,\n--\ndrivers/net/macvlan.c-463-/* called under rcu_read_lock() from netif_receive_skb */\ndrivers/net/macvlan.c:464:static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)\ndrivers/net/macvlan.c-465-{\n--\ndrivers/net/macvlan.c=1278=static int macvlan_port_create(struct net_device *dev)\n--\ndrivers/net/macvlan.c-1306-\ndrivers/net/macvlan.c:1307:\terr = netdev_rx_handler_register(dev, macvlan_handle_frame, port);\ndrivers/net/macvlan.c-1308-\tif (err)\n--\ndrivers/net/macvlan.c=1485=int macvlan_common_newlink(struct net_device *dev,\n--\ndrivers/net/macvlan.c-1605-\ndrivers/net/macvlan.c:1606:\t/* macvlan_handle_frame expects the (one and only) passthru device first. */\ndrivers/net/macvlan.c-1607-\tif (vlan-\u003emode == MACVLAN_MODE_PASSTHRU) {\n"
}

							input: 18800
							output: 37
							thoughts: 25

Okay, let's dive into this. I'm going to pull up `drivers/net/macvlan.c` and specifically focus on the `macvlan_handle_frame` function. I know this is where the core logic for handling incoming frames in a Macvlan environment resides. I'm expecting this to be the central point where the kernel decides how to route and process traffic that arrives on the physical interface but is destined for one of the virtual interfaces. I'll be looking for how it determines the intended destination, whether it's checking MAC addresses, VLAN tags, or some other identifier. I'll also be trying to understand how it interacts with the lower network stack and how it decides whether to forward the frame upwards, drop it, or inject it into another Macvlan interface. I'm keen to see if there are any specific optimizations or quirks for different frame types or network protocols. This is where the rubber meets the road, so let's see what's actually happening at the packet level.

{
  "File": "drivers/net/macvlan.c",
  "FirstLine": 463,
  "LineCount": 70
}

{
  "Contents": " 463:\t/* called under rcu_read_lock() from netif_receive_skb */\n 464:\tstatic rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)\n 465:\t{\n 466:\t\tstruct macvlan_port *port;\n 467:\t\tstruct sk_buff *skb = *pskb;\n 468:\t\tconst struct ethhdr *eth = eth_hdr(skb);\n 469:\t\tconst struct macvlan_dev *vlan;\n 470:\t\tconst struct macvlan_dev *src;\n 471:\t\tstruct net_device *dev;\n 472:\t\tunsigned int len = 0;\n 473:\t\tint ret;\n 474:\t\trx_handler_result_t handle_res;\n 475:\t\n 476:\t\t/* Packets from dev_loopback_xmit() do not have L2 header, bail out */\n 477:\t\tif (unlikely(skb-\u003epkt_type == PACKET_LOOPBACK))\n 478:\t\t\treturn RX_HANDLER_PASS;\n 479:\t\n 480:\t\tport = macvlan_port_get_rcu(skb-\u003edev);\n 481:\t\tif (is_multicast_ether_addr(eth-\u003eh_dest)) {\n 482:\t\t\tunsigned int hash;\n 483:\t\n 484:\t\t\tskb = ip_check_defrag(dev_net(skb-\u003edev), skb, IP_DEFRAG_MACVLAN);\n 485:\t\t\tif (!skb)\n 486:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 487:\t\t\t*pskb = skb;\n 488:\t\t\teth = eth_hdr(skb);\n 489:\t\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 490:\t\t\t\tkfree_skb(skb);\n 491:\t\t\t\treturn RX_HANDLER_CONSUMED;\n 492:\t\t\t}\n 493:\t\t\tsrc = macvlan_hash_lookup(port, eth-\u003eh_source);\n 494:\t\t\tif (src) {\n 495:\t\t\t\tenum macvlan_mode mode = READ_ONCE(src-\u003emode);\n 496:\t\n 497:\t\t\t\tif (mode != MACVLAN_MODE_VEPA \u0026\u0026\n 498:\t\t\t\t    mode != MACVLAN_MODE_BRIDGE) {\n 499:\t\t\t\t\t/* forward to original port. */\n 500:\t\t\t\t\tvlan = src;\n 501:\t\t\t\t\tret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:\n 502:\t\t\t\t\t      __netif_rx(skb);\n 503:\t\t\t\t\thandle_res = RX_HANDLER_CONSUMED;\n 504:\t\t\t\t\tgoto out;\n 505:\t\t\t\t}\n 506:\t\t\t}\n 507:\t\n 508:\t\t\thash = mc_hash(NULL, eth-\u003eh_dest);\n 509:\t\t\tif (test_bit(hash, port-\u003ebc_filter))\n 510:\t\t\t\tmacvlan_broadcast_enqueue(port, src, skb);\n 511:\t\t\telse if (test_bit(hash, port-\u003emc_filter))\n 512:\t\t\t\tmacvlan_multicast_rx(port, src, skb);\n 513:\t\n 514:\t\t\treturn RX_HANDLER_PASS;\n 515:\t\t}\n 516:\t\n 517:\t\tif (macvlan_forward_source(skb, port, eth-\u003eh_source)) {\n 518:\t\t\tkfree_skb(skb);\n 519:\t\t\treturn RX_HANDLER_CONSUMED;\n 520:\t\t}\n 521:\t\tif (macvlan_passthru(port))\n 522:\t\t\tvlan = list_first_or_null_rcu(\u0026port-\u003evlans,\n 523:\t\t\t\t\t\t      struct macvlan_dev, list);\n 524:\t\telse\n 525:\t\t\tvlan = macvlan_hash_lookup(port, eth-\u003eh_dest);\n 526:\t\tif (!vlan || READ_ONCE(vlan-\u003emode) == MACVLAN_MODE_SOURCE)\n 527:\t\t\treturn RX_HANDLER_PASS;\n 528:\t\n 529:\t\tdev = vlan-\u003edev;\n 530:\t\tif (unlikely(!(dev-\u003eflags \u0026 IFF_UP))) {\n 531:\t\t\tkfree_skb(skb);\n 532:\t\t\treturn RX_HANDLER_CONSUMED;\n"
}

							input: 20274
							output: 36
							thoughts: 385

**My Analysis of the Macvlan Patch**

Okay, here's what I'm seeing. Line 521 is where the decision is made about how a MACVLAN device handles a received frame, specifically based on whether the device is in "passthru" mode or not. That choice directly influences how it looks up the associated VLAN. The `macvlan_passthru()` function and the VLAN lookup logic are the core of this section. It’s all about the interplay between `port->vlans` (likely a list of VLAN devices attached to a physical port) and the frame's destination MAC address. Importantly, the code checks the `vlan->mode` and skips the frame if it's `MACVLAN_MODE_SOURCE`.

Looking back at `macvlan_common_newlink`, the code decides on how to insert the vlan into the list, depending on the `MACVLAN_MODE`. If it's `PASSTHRU`, it's added at the head of the list, otherwise it goes to the tail. It’s clear this part of the code is responsible for initializing and configuring new MACVLAN links, ensuring that the "passthru" device, if it exists, is prioritized within the list. These actions are directly tied to network device configuration, link management, list insertion order, various flags, promiscuity, and the critical role of RTNL (Routing Table Netlink) notifications.

Now, I need to consider KMSAN (Kernel Memory Sanitizer) and potential uninitialized memory exposures. The key here is whether this patch introduces any data that’s communicated to userspace. I've got to scrutinize any interactions between kernel structures and userspace applications. Are we modifying any structures that are ultimately exposed via `copy_to_user`, `put_user`, netlink SKB attributes, ioctl output arguments, socket options, or BPF buffers? I need to look for calls to `fill_info` functions or anything that manipulates netlink attributes, as these are common ways for kernel data to leak to userspace. I'll need to check if `macvlan_fill_info` is being modified. That would be a good place to start.

{
  "Expression": "macvlan_fill_info",
  "PathPrefix": "drivers/net/macvlan.c"
}

{
  "Output": "drivers/net/macvlan.c=1744=static size_t macvlan_get_size(const struct net_device *dev)\n--\ndrivers/net/macvlan.c-1758-\ndrivers/net/macvlan.c:1759:static int macvlan_fill_info_macaddr(struct sk_buff *skb,\ndrivers/net/macvlan.c-1760-\t\t\t\t     const struct macvlan_dev *vlan,\n--\ndrivers/net/macvlan.c-1776-\ndrivers/net/macvlan.c:1777:static int macvlan_fill_info(struct sk_buff *skb,\ndrivers/net/macvlan.c-1778-\t\t\t\tconst struct net_device *dev)\n--\ndrivers/net/macvlan.c-1802-\t\tfor (i = 0; i \u003c MACVLAN_HASH_SIZE; i++) {\ndrivers/net/macvlan.c:1803:\t\t\tcnt = macvlan_fill_info_macaddr(skb, vlan, i);\ndrivers/net/macvlan.c-1804-\t\t\tif (cnt \u003c 0)\n--\ndrivers/net/macvlan.c=1848=int macvlan_link_register(struct rtnl_link_ops *ops)\n--\ndrivers/net/macvlan.c-1855-\tops-\u003eget_size\t\t= macvlan_get_size;\ndrivers/net/macvlan.c:1856:\tops-\u003efill_info\t\t= macvlan_fill_info;\ndrivers/net/macvlan.c-1857-\n"
}

							input: 21595
							output: 426
							thoughts: 1078

**KMSAN Assessment: No Need for Dedicated Session**

Okay, let's break this down. First, I noticed that `macvlan_fill_info` wasn't touched by this patch, so we can set that aside. My focus is on potentially uninitialized memory reads.

Checking the code, I see a few areas. In `macvlan_clear_passthru`, `port` is passed in, and `port->flags` are manipulated.  In `macvlan_sync_address`, a boolean `passthru_dev` is initialized, which is good.  `macvlan_uninit` has a `struct sockaddr_storage ss`, but it's *only* used if the MAC addresses don't match, and the code looks identical to what was previously in `macvlan_port_destroy`.  `macvlan_common_newlink` has a loop cursor, and `macvlan_changelink` and `macvlan_device_event` now have updated conditionals.

Critically, there are no *new* allocations introduced.  I'm not changing any packet buffer bounds or parsing logic.

Now, let's consider the risks. I'm thinking about passthru devices and source mode devices co-existing.  How are frames handled in that situation? The list manipulation with `list_add_rcu` vs `list_add_tail_rcu` is something to look at. The event notification when the lower device MAC address is restored is also important. I need to make sure this doesn't create any kind of recursion or locking issue. I can't be sure this is correct.

There is a big comment related to this: `Caution: This triggers NETDEV_CHANGEADDR on the lower device. But we're in the green because the passthru interface is already off the list.`

I'm concerned about race conditions, locking, RTNL requirements, and potential use-after-free or list corruption if links are created or removed concurrently.

But, and this is the key point, any of those potential bugs – deadlocks, list corruption, UAF, NULL deref – should be caught by KASAN, LOCKDEP, and the standard kernel debugging tools.  *Not* KMSAN.

The rule is clear: *If* a bug can be caught by KASAN, LOCKDEP, or standard bug detectors, there is *no* need for KMSAN. I only need KMSAN if there are uninitialized memory risks that are *only* detected by KMSAN.

So, let me summarize:

The patch allows for passthru macvlan devices and source mode macvlan devices to co-exist.  It modifies mode checks, handles MAC address restoration in `uninit` rather than `port_destroy`, and orders the list for passthru devices.

No new data structures, memory allocations, or copies to userspace are introduced.  The `struct sockaddr_storage ss` in `macvlan_uninit` is a verbatim move from `macvlan_port_destroy` and passes type and permanent MAC address to `dev_set_mac_address`.

Potential bugs relate to link state, list traversal/RCU synchronization, or notifier recursion, which are covered by existing detectors.  *Therefore, there are no uninitialized memory access risks.*

I'm confident we can set `NeedsKMSAN=false`. Let's call `set-results`.

{
  "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch updates the macvlan driver (drivers/net/macvlan.c) to allow creating a passthru mode macvlan alongside source mode macvlans on the same underlying port. The changes consist of:\n1. Updating validation logic in macvlan_common_newlink() and macvlan_changelink() to permit source mode devices alongside passthru mode.\n2. Updating per-device checks in macvlan_open(), macvlan_stop(), and macvlan_sync_address() to check vlan-\u003emode == MACVLAN_MODE_PASSTHRU rather than port-wide passthru flags.\n3. Moving the restoration of the lower device MAC address from macvlan_port_destroy() to macvlan_uninit() when removing a passthru device.\n4. Adjusting netdevice event handling and list insertion ordering (inserting passthru at head so packet dispatch finds it).\n\nFrom a memory sanitization perspective:\n- No new memory allocations or buffers are added.\n- No kernel-to-user copy routines (e.g. copy_to_user, netlink attributes, ioctls) are added or modified.\n- The 'struct sockaddr_storage ss' used in macvlan_uninit() was moved verbatim from macvlan_port_destroy() and initializes all fields accessed by dev_set_mac_address().\n- All branching and control flow rely on fully initialized struct fields (e.g. vlan-\u003emode, port-\u003eflags).\n- Potential issues resulting from this patch (such as list manipulation under RCU, notifier reentrancy, or lifetime issues during device unregistration) are covered by KASAN, LOCKDEP, and other standard bug detectors.\n\nBecause there are no risks of uninitialized memory reads or information leaks, a dedicated KMSAN fuzzing session is not warranted.",
  "NeedsKMSAN": false
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)