AI Trajectory

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "KMSANReasoning": "",
  "NeedsKMSAN": false,
  "Reasoning": "The patch modifies the Mellanox mlx5 driver, which requires physical PCIe hardware not emulated in standard QEMU/GCE environments.",
  "WorthFuzzing": false
}

null

{
  "PatchDiff": "commit a393450922f996dabd236375ff74d6f91f940585\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Aug 10 09:49:25 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c\nindex ee2fdefa1945f..4cdc50cd6f038 100644\n--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c\n+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c\n@@ -19,7 +19,7 @@\n \n struct mlx5_sd {\n \tu32 group_id;\n-\tu8 host_buses;\n+\tu8 group_size;\n \tstruct mlx5_devcom_comp_dev *devcom;\n \tstruct dentry *dfs;\n \tu8 state;\n@@ -46,14 +46,14 @@ enum mlx5_sd_state {\n \tMLX5_SD_STATE_UP,\n };\n \n-static int mlx5_sd_get_host_buses(struct mlx5_core_dev *dev)\n+static int mlx5_sd_get_group_size(struct mlx5_core_dev *dev)\n {\n \tstruct mlx5_sd *sd = mlx5_get_sd(dev);\n \n \tif (!sd)\n \t\treturn 1;\n \n-\treturn sd-\u003ehost_buses;\n+\treturn sd-\u003egroup_size;\n }\n \n struct mlx5_core_dev *mlx5_sd_get_primary(struct mlx5_core_dev *dev)\n@@ -107,7 +107,7 @@ int mlx5_sd_pf_num_get(struct mlx5_core_dev *dev)\n \t\tif (pos == dev)\n \t\t\tbreak;\n \n-\treturn pf_num * sd-\u003ehost_buses + i;\n+\treturn pf_num * sd-\u003egroup_size + i;\n }\n \n struct mlx5_core_dev *\n@@ -118,7 +118,7 @@ mlx5_sd_primary_get_peer(struct mlx5_core_dev *primary, int idx)\n \tif (idx == 0)\n \t\treturn primary;\n \n-\tif (idx \u003e= mlx5_sd_get_host_buses(primary))\n+\tif (idx \u003e= mlx5_sd_get_group_size(primary))\n \t\treturn NULL;\n \n \tsd = mlx5_get_sd(primary);\n@@ -130,7 +130,7 @@ int mlx5_sd_ch_ix_get_dev_ix(struct mlx5_core_dev *dev, int ch_ix)\n \tif (is_mdev_switchdev_mode(dev))\n \t\treturn 0;\n \n-\treturn ch_ix % mlx5_sd_get_host_buses(dev);\n+\treturn ch_ix % mlx5_sd_get_group_size(dev);\n }\n \n int mlx5_sd_ch_ix_get_vec_ix(struct mlx5_core_dev *dev, int ch_ix)\n@@ -138,7 +138,7 @@ int mlx5_sd_ch_ix_get_vec_ix(struct mlx5_core_dev *dev, int ch_ix)\n \tif (is_mdev_switchdev_mode(dev))\n \t\treturn ch_ix;\n \n-\treturn ch_ix / mlx5_sd_get_host_buses(dev);\n+\treturn ch_ix / mlx5_sd_get_group_size(dev);\n }\n \n struct mlx5_core_dev *mlx5_sd_ch_ix_get_dev(struct mlx5_core_dev *primary, int ch_ix)\n@@ -164,7 +164,7 @@ static bool ft_create_alias_supported(struct mlx5_core_dev *dev)\n }\n \n static int mlx5_query_sd(struct mlx5_core_dev *dev, bool *sdm,\n-\t\t\t u8 *host_buses)\n+\t\t\t u8 *group_size)\n {\n \tu32 out[MLX5_ST_SZ_DW(mpir_reg)];\n \tint err;\n@@ -174,7 +174,7 @@ static int mlx5_query_sd(struct mlx5_core_dev *dev, bool *sdm,\n \t\treturn err;\n \n \t*sdm = MLX5_GET(mpir_reg, out, sdm);\n-\t*host_buses = MLX5_GET(mpir_reg, out, host_buses);\n+\t*group_size = MLX5_GET(mpir_reg, out, host_buses);\n \n \treturn 0;\n }\n@@ -184,10 +184,10 @@ static u32 mlx5_sd_group_id(struct mlx5_core_dev *dev, u8 sd_group)\n \treturn (u32)((MLX5_CAP_GEN(dev, native_port_num) \u003c\u003c 8) | sd_group);\n }\n \n-static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)\n+static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 group_size)\n {\n \t/* Honor the SW implementation limit */\n-\tif (host_buses \u003e MLX5_SD_MAX_GROUP_SZ)\n+\tif (group_size \u003e MLX5_SD_MAX_GROUP_SZ)\n \t\treturn false;\n \n \t/* Disconnect secondaries from the network */\n@@ -200,7 +200,7 @@ static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)\n \t/* RX steering from primary to secondaries */\n \tif (!MLX5_CAP_GEN(dev, cross_vhca_rqt))\n \t\treturn false;\n-\tif (host_buses \u003e MLX5_CAP_GEN_2(dev, max_rqt_vhca_id))\n+\tif (group_size \u003e MLX5_CAP_GEN_2(dev, max_rqt_vhca_id))\n \t\treturn false;\n \n \t/* TX steering from secondaries to primary */\n@@ -214,7 +214,7 @@ static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)\n \n bool mlx5_sd_is_supported(struct mlx5_core_dev *dev)\n {\n-\tu8 host_buses, sd_group;\n+\tu8 group_size = U8_MAX, sd_group;\n \tbool sdm;\n \tint err;\n \n@@ -222,23 +222,25 @@ bool mlx5_sd_is_supported(struct mlx5_core_dev *dev)\n \tif (!mlx5_core_is_pf(dev))\n \t\treturn false;\n \n-\terr = mlx5_query_nic_vport_sd_group(dev, \u0026sd_group);\n-\tif (err || !sd_group)\n+\terr = mlx5_query_nic_vport_sd_group(dev, \u0026sd_group, \u0026group_size);\n+\tif (err || !sd_group || group_size \u003c MLX5_SD_MIN_GROUP_SZ)\n \t\treturn false;\n \n-\tif (!MLX5_CAP_MCAM_REG(dev, mpir))\n-\t\treturn false;\n+\tif (group_size == U8_MAX) {\n+\t\tif (!MLX5_CAP_MCAM_REG(dev, mpir))\n+\t\t\treturn false;\n \n-\terr = mlx5_query_sd(dev, \u0026sdm, \u0026host_buses);\n-\tif (err || !sdm)\n-\t\treturn false;\n+\t\terr = mlx5_query_sd(dev, \u0026sdm, \u0026group_size);\n+\t\tif (err || !sdm)\n+\t\t\treturn false;\n+\t}\n \n-\treturn mlx5_sd_caps_supported(dev, host_buses);\n+\treturn mlx5_sd_caps_supported(dev, group_size);\n }\n \n static int sd_init(struct mlx5_core_dev *dev)\n {\n-\tu8 host_buses, sd_group;\n+\tu8 group_size = U8_MAX, sd_group;\n \tstruct mlx5_sd *sd;\n \tu32 group_id;\n \tbool sdm;\n@@ -248,26 +250,27 @@ static int sd_init(struct mlx5_core_dev *dev)\n \tif (!mlx5_core_is_pf(dev))\n \t\treturn 0;\n \n-\terr = mlx5_query_nic_vport_sd_group(dev, \u0026sd_group);\n+\terr = mlx5_query_nic_vport_sd_group(dev, \u0026sd_group, \u0026group_size);\n \tif (err)\n \t\treturn err;\n \n-\tif (!sd_group)\n+\tif (!sd_group || group_size \u003c MLX5_SD_MIN_GROUP_SZ)\n \t\treturn 0;\n \n-\tif (!MLX5_CAP_MCAM_REG(dev, mpir))\n-\t\treturn 0;\n+\tif (group_size == U8_MAX) {\n+\t\tif (!MLX5_CAP_MCAM_REG(dev, mpir))\n+\t\t\treturn 0;\n \n-\terr = mlx5_query_sd(dev, \u0026sdm, \u0026host_buses);\n-\tif (err)\n-\t\treturn err;\n-\n-\tif (!sdm)\n-\t\treturn 0;\n+\t\terr = mlx5_query_sd(dev, \u0026sdm, \u0026group_size);\n+\t\tif (err)\n+\t\t\treturn err;\n \n+\t\tif (!sdm)\n+\t\t\treturn 0;\n+\t}\n \tgroup_id = mlx5_sd_group_id(dev, sd_group);\n \n-\tif (!mlx5_sd_caps_supported(dev, host_buses)) {\n+\tif (!mlx5_sd_caps_supported(dev, group_size)) {\n \t\tsd_warn(dev, \"can't support requested netdev combining for group id 0x%x, skipping\\n\",\n \t\t\tgroup_id);\n \t\treturn 0;\n@@ -277,7 +280,7 @@ static int sd_init(struct mlx5_core_dev *dev)\n \tif (!sd)\n \t\treturn -ENOMEM;\n \n-\tsd-\u003ehost_buses = host_buses;\n+\tsd-\u003egroup_size = group_size;\n \tsd-\u003egroup_id = group_id;\n \n \tmlx5_set_sd(dev, sd);\n@@ -540,7 +543,7 @@ static int sd_register(struct mlx5_core_dev *dev)\n \tsd-\u003edevcom = devcom;\n \n \tmlx5_devcom_comp_lock(devcom);\n-\tif (mlx5_devcom_comp_get_size(devcom) != sd-\u003ehost_buses ||\n+\tif (mlx5_devcom_comp_get_size(devcom) != sd-\u003egroup_size ||\n \t    mlx5_devcom_comp_is_ready(devcom))\n \t\tgoto out;\n \n@@ -576,7 +579,7 @@ static int sd_register(struct mlx5_core_dev *dev)\n \t\t\t\t      DEVCOM_CANT_FAIL, primary);\n \n \tprimary_sd = mlx5_get_sd(primary);\n-\tif (primary_sd-\u003enext_secondary_idx + 1 == sd-\u003ehost_buses)\n+\tif (primary_sd-\u003enext_secondary_idx + 1 == sd-\u003egroup_size)\n \t\tmlx5_devcom_comp_set_ready(devcom, true);\n out:\n \tmlx5_devcom_comp_unlock(devcom);\ndiff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h\nindex cb88bf34079ad..bc8dbc2990704 100644\n--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h\n+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h\n@@ -6,6 +6,7 @@\n \n #include \u003clinux/types.h\u003e\n \n+#define MLX5_SD_MIN_GROUP_SZ 2\n #define MLX5_SD_MAX_GROUP_SZ 2\n \n struct mlx5_sd;\ndiff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c\nindex 3676e26ac6b09..3d86510af6153 100644\n--- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c\n+++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c\n@@ -550,7 +550,8 @@ int mlx5_query_nic_vport_system_image_guid(struct mlx5_core_dev *mdev,\n }\n EXPORT_SYMBOL_GPL(mlx5_query_nic_vport_system_image_guid);\n \n-int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group)\n+int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group,\n+\t\t\t\t  u8 *sd_group_size)\n {\n \tint outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);\n \tu32 *out;\n@@ -566,6 +567,9 @@ int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group)\n \n \t*sd_group = MLX5_GET(query_nic_vport_context_out, out,\n \t\t\t     nic_vport_context.sd_group);\n+\tif (MLX5_CAP_GEN(mdev, sd_group_size))\n+\t\t*sd_group_size = MLX5_GET(query_nic_vport_context_out, out,\n+\t\t\t\t\t  nic_vport_context.sd_group_size);\n out:\n \tkvfree(out);\n \treturn err;\ndiff --git a/include/linux/mlx5/vport.h b/include/linux/mlx5/vport.h\nindex ee34d3ed335f3..577168a4ca0c8 100644\n--- a/include/linux/mlx5/vport.h\n+++ b/include/linux/mlx5/vport.h\n@@ -78,7 +78,8 @@ int mlx5_query_nic_vport_mtu(struct mlx5_core_dev *mdev, u16 *mtu);\n int mlx5_modify_nic_vport_mtu(struct mlx5_core_dev *mdev, u16 mtu);\n int mlx5_query_nic_vport_system_image_guid(struct mlx5_core_dev *mdev,\n \t\t\t\t\t   u64 *system_image_guid);\n-int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group);\n+int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group,\n+\t\t\t\t  u8 *sd_group_size);\n int mlx5_query_nic_vport_node_guid(struct mlx5_core_dev *mdev,\n \t\t\t\t   u16 vport, bool other_vport, u64 *node_guid);\n int mlx5_modify_nic_vport_node_guid(struct mlx5_core_dev *mdev,\n"
}

best-expensive

null

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the Mellanox mlx5 driver, which requires physical PCIe hardware not emulated in standard QEMU/GCE environments.",
  "WorthFuzzing": false
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a '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.

For your convenience, here is the diff of the changes:
commit a393450922f996dabd236375ff74d6f91f940585
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Aug 10 09:49:25 2026 +0000

    syz-cluster: applied patch under review

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
index ee2fdefa1945f..4cdc50cd6f038 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
@@ -19,7 +19,7 @@
 
 struct mlx5_sd {
 	u32 group_id;
-	u8 host_buses;
+	u8 group_size;
 	struct mlx5_devcom_comp_dev *devcom;
 	struct dentry *dfs;
 	u8 state;
@@ -46,14 +46,14 @@ enum mlx5_sd_state {
 	MLX5_SD_STATE_UP,
 };
 
-static int mlx5_sd_get_host_buses(struct mlx5_core_dev *dev)
+static int mlx5_sd_get_group_size(struct mlx5_core_dev *dev)
 {
 	struct mlx5_sd *sd = mlx5_get_sd(dev);
 
 	if (!sd)
 		return 1;
 
-	return sd->host_buses;
+	return sd->group_size;
 }
 
 struct mlx5_core_dev *mlx5_sd_get_primary(struct mlx5_core_dev *dev)
@@ -107,7 +107,7 @@ int mlx5_sd_pf_num_get(struct mlx5_core_dev *dev)
 		if (pos == dev)
 			break;
 
-	return pf_num * sd->host_buses + i;
+	return pf_num * sd->group_size + i;
 }
 
 struct mlx5_core_dev *
@@ -118,7 +118,7 @@ mlx5_sd_primary_get_peer(struct mlx5_core_dev *primary, int idx)
 	if (idx == 0)
 		return primary;
 
-	if (idx >= mlx5_sd_get_host_buses(primary))
+	if (idx >= mlx5_sd_get_group_size(primary))
 		return NULL;
 
 	sd = mlx5_get_sd(primary);
@@ -130,7 +130,7 @@ int mlx5_sd_ch_ix_get_dev_ix(struct mlx5_core_dev *dev, int ch_ix)
 	if (is_mdev_switchdev_mode(dev))
 		return 0;
 
-	return ch_ix % mlx5_sd_get_host_buses(dev);
+	return ch_ix % mlx5_sd_get_group_size(dev);
 }
 
 int mlx5_sd_ch_ix_get_vec_ix(struct mlx5_core_dev *dev, int ch_ix)
@@ -138,7 +138,7 @@ int mlx5_sd_ch_ix_get_vec_ix(struct mlx5_core_dev *dev, int ch_ix)
 	if (is_mdev_switchdev_mode(dev))
 		return ch_ix;
 
-	return ch_ix / mlx5_sd_get_host_buses(dev);
+	return ch_ix / mlx5_sd_get_group_size(dev);
 }
 
 struct mlx5_core_dev *mlx5_sd_ch_ix_get_dev(struct mlx5_core_dev *primary, int ch_ix)
@@ -164,7 +164,7 @@ static bool ft_create_alias_supported(struct mlx5_core_dev *dev)
 }
 
 static int mlx5_query_sd(struct mlx5_core_dev *dev, bool *sdm,
-			 u8 *host_buses)
+			 u8 *group_size)
 {
 	u32 out[MLX5_ST_SZ_DW(mpir_reg)];
 	int err;
@@ -174,7 +174,7 @@ static int mlx5_query_sd(struct mlx5_core_dev *dev, bool *sdm,
 		return err;
 
 	*sdm = MLX5_GET(mpir_reg, out, sdm);
-	*host_buses = MLX5_GET(mpir_reg, out, host_buses);
+	*group_size = MLX5_GET(mpir_reg, out, host_buses);
 
 	return 0;
 }
@@ -184,10 +184,10 @@ static u32 mlx5_sd_group_id(struct mlx5_core_dev *dev, u8 sd_group)
 	return (u32)((MLX5_CAP_GEN(dev, native_port_num) << 8) | sd_group);
 }
 
-static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)
+static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 group_size)
 {
 	/* Honor the SW implementation limit */
-	if (host_buses > MLX5_SD_MAX_GROUP_SZ)
+	if (group_size > MLX5_SD_MAX_GROUP_SZ)
 		return false;
 
 	/* Disconnect secondaries from the network */
@@ -200,7 +200,7 @@ static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)
 	/* RX steering from primary to secondaries */
 	if (!MLX5_CAP_GEN(dev, cross_vhca_rqt))
 		return false;
-	if (host_buses > MLX5_CAP_GEN_2(dev, max_rqt_vhca_id))
+	if (group_size > MLX5_CAP_GEN_2(dev, max_rqt_vhca_id))
 		return false;
 
 	/* TX steering from secondaries to primary */
@@ -214,7 +214,7 @@ static bool mlx5_sd_caps_supported(struct mlx5_core_dev *dev, u8 host_buses)
 
 bool mlx5_sd_is_supported(struct mlx5_core_dev *dev)
 {
-	u8 host_buses, sd_group;
+	u8 group_size = U8_MAX, sd_group;
 	bool sdm;
 	int err;
 
@@ -222,23 +222,25 @@ bool mlx5_sd_is_supported(struct mlx5_core_dev *dev)
 	if (!mlx5_core_is_pf(dev))
 		return false;
 
-	err = mlx5_query_nic_vport_sd_group(dev, &sd_group);
-	if (err || !sd_group)
+	err = mlx5_query_nic_vport_sd_group(dev, &sd_group, &group_size);
+	if (err || !sd_group || group_size < MLX5_SD_MIN_GROUP_SZ)
 		return false;
 
-	if (!MLX5_CAP_MCAM_REG(dev, mpir))
-		return false;
+	if (group_size == U8_MAX) {
+		if (!MLX5_CAP_MCAM_REG(dev, mpir))
+			return false;
 
-	err = mlx5_query_sd(dev, &sdm, &host_buses);
-	if (err || !sdm)
-		return false;
+		err = mlx5_query_sd(dev, &sdm, &group_size);
+		if (err || !sdm)
+			return false;
+	}
 
-	return mlx5_sd_caps_supported(dev, host_buses);
+	return mlx5_sd_caps_supported(dev, group_size);
 }
 
 static int sd_init(struct mlx5_core_dev *dev)
 {
-	u8 host_buses, sd_group;
+	u8 group_size = U8_MAX, sd_group;
 	struct mlx5_sd *sd;
 	u32 group_id;
 	bool sdm;
@@ -248,26 +250,27 @@ static int sd_init(struct mlx5_core_dev *dev)
 	if (!mlx5_core_is_pf(dev))
 		return 0;
 
-	err = mlx5_query_nic_vport_sd_group(dev, &sd_group);
+	err = mlx5_query_nic_vport_sd_group(dev, &sd_group, &group_size);
 	if (err)
 		return err;
 
-	if (!sd_group)
+	if (!sd_group || group_size < MLX5_SD_MIN_GROUP_SZ)
 		return 0;
 
-	if (!MLX5_CAP_MCAM_REG(dev, mpir))
-		return 0;
+	if (group_size == U8_MAX) {
+		if (!MLX5_CAP_MCAM_REG(dev, mpir))
+			return 0;
 
-	err = mlx5_query_sd(dev, &sdm, &host_buses);
-	if (err)
-		return err;
-
-	if (!sdm)
-		return 0;
+		err = mlx5_query_sd(dev, &sdm, &group_size);
+		if (err)
+			return err;
 
+		if (!sdm)
+			return 0;
+	}
 	group_id = mlx5_sd_group_id(dev, sd_group);
 
-	if (!mlx5_sd_caps_supported(dev, host_buses)) {
+	if (!mlx5_sd_caps_supported(dev, group_size)) {
 		sd_warn(dev, "can't support requested netdev combining for group id 0x%x, skipping\n",
 			group_id);
 		return 0;
@@ -277,7 +280,7 @@ static int sd_init(struct mlx5_core_dev *dev)
 	if (!sd)
 		return -ENOMEM;
 
-	sd->host_buses = host_buses;
+	sd->group_size = group_size;
 	sd->group_id = group_id;
 
 	mlx5_set_sd(dev, sd);
@@ -540,7 +543,7 @@ static int sd_register(struct mlx5_core_dev *dev)
 	sd->devcom = devcom;
 
 	mlx5_devcom_comp_lock(devcom);
-	if (mlx5_devcom_comp_get_size(devcom) != sd->host_buses ||
+	if (mlx5_devcom_comp_get_size(devcom) != sd->group_size ||
 	    mlx5_devcom_comp_is_ready(devcom))
 		goto out;
 
@@ -576,7 +579,7 @@ static int sd_register(struct mlx5_core_dev *dev)
 				      DEVCOM_CANT_FAIL, primary);
 
 	primary_sd = mlx5_get_sd(primary);
-	if (primary_sd->next_secondary_idx + 1 == sd->host_buses)
+	if (primary_sd->next_secondary_idx + 1 == sd->group_size)
 		mlx5_devcom_comp_set_ready(devcom, true);
 out:
 	mlx5_devcom_comp_unlock(devcom);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h
index cb88bf34079ad..bc8dbc2990704 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h
@@ -6,6 +6,7 @@
 
 #include <linux/types.h>
 
+#define MLX5_SD_MIN_GROUP_SZ 2
 #define MLX5_SD_MAX_GROUP_SZ 2
 
 struct mlx5_sd;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
index 3676e26ac6b09..3d86510af6153 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
@@ -550,7 +550,8 @@ int mlx5_query_nic_vport_system_image_guid(struct mlx5_core_dev *mdev,
 }
 EXPORT_SYMBOL_GPL(mlx5_query_nic_vport_system_image_guid);
 
-int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group)
+int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group,
+				  u8 *sd_group_size)
 {
 	int outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);
 	u32 *out;
@@ -566,6 +567,9 @@ int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group)
 
 	*sd_group = MLX5_GET(query_nic_vport_context_out, out,
 			     nic_vport_context.sd_group);
+	if (MLX5_CAP_GEN(mdev, sd_group_size))
+		*sd_group_size = MLX5_GET(query_nic_vport_context_out, out,
+					  nic_vport_context.sd_group_size);
 out:
 	kvfree(out);
 	return err;
diff --git a/include/linux/mlx5/vport.h b/include/linux/mlx5/vport.h
index ee34d3ed335f3..577168a4ca0c8 100644
--- a/include/linux/mlx5/vport.h
+++ b/include/linux/mlx5/vport.h
@@ -78,7 +78,8 @@ int mlx5_query_nic_vport_mtu(struct mlx5_core_dev *mdev, u16 *mtu);
 int mlx5_modify_nic_vport_mtu(struct mlx5_core_dev *mdev, u16 mtu);
 int mlx5_query_nic_vport_system_image_guid(struct mlx5_core_dev *mdev,
 					   u64 *system_image_guid);
-int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group);
+int mlx5_query_nic_vport_sd_group(struct mlx5_core_dev *mdev, u8 *sd_group,
+				  u8 *sd_group_size);
 int mlx5_query_nic_vport_node_guid(struct mlx5_core_dev *mdev,
 				   u16 vport, bool other_vport, u64 *node_guid);
 int mlx5_modify_nic_vport_node_guid(struct mlx5_core_dev *mdev,

gemini-3.1-pro-preview

null

null

							input: 5931
							output: 61
							thoughts: 434
						

**WorthFuzzing Decision for Mellanox mlx5 Driver Patch**

Okay, let's break this down. I've got a patch here impacting `drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c`, `drivers/net/ethernet/mellanox/mlx5/core/vport.c`, and `include/linux/mlx5/vport.h`. This is clearly targeting the Mellanox mlx5 driver, which I know is used for ConnectX-4, -5, -6, and -7 PCIe network cards. These are high-performance SmartNICs. The instructions explicitly say to set `WorthFuzzing=false` if the patch concerns vendor-specific drivers that need physical hardware, which isn't emulated by QEMU.

Now, the question is, does QEMU emulate mlx5? No, it doesn't. QEMU uses drivers like e1000, virtio-net, and vmxnet3, but not mlx5. So, mlx5 absolutely needs the physical Mellanox hardware. This means, I'm not going to be able to reach this in a virtualized environment like GCE or using standard QEMU.

Just to be absolutely sure, let's revisit the files impacted: `drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c`. Yeah, this is core mlx5 driver code, no doubt about it.

Therefore, my decision is **`WorthFuzzing=false`** and the reasoning I'm using is "The patch modifies the Mellanox mlx5 driver, which requires physical PCIe hardware not emulated in standard QEMU/GCE environments."

{
  "EnableConfigs": [],
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the Mellanox mlx5 driver, which requires physical PCIe hardware not emulated in standard QEMU/GCE environments.",
  "WorthFuzzing": false
}

{
  "EnableConfigs": null,
  "FocusSymbols": [],
  "Reasoning": "The patch modifies the Mellanox mlx5 driver, which requires physical PCIe hardware not emulated in standard QEMU/GCE environments.",
  "WorthFuzzing": false
}

{
  "WorthFuzzing": false
}

null