Add support for the ad_actor_port_prio option for bond slaves.
This per-port priority can be used by the bonding driver in ad_select to
choose the higher-priority aggregator during failover.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
 ip/iplink_bond.c       |  1 +
 ip/iplink_bond_slave.c | 18 ++++++++++++++++--
 man/man8/ip-link.8.in  |  6 ++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/ip/iplink_bond.c b/ip/iplink_bond.c
index d6960f6d9b03..1a2c1b3042a0 100644
--- a/ip/iplink_bond.c
+++ b/ip/iplink_bond.c
@@ -91,6 +91,7 @@ static const char *ad_select_tbl[] = {
 	"stable",
 	"bandwidth",
 	"count",
+	"prio",
 	NULL,
 };
 
diff --git a/ip/iplink_bond_slave.c b/ip/iplink_bond_slave.c
index ad6875006950..67b154e194f7 100644
--- a/ip/iplink_bond_slave.c
+++ b/ip/iplink_bond_slave.c
@@ -15,7 +15,9 @@
 
 static void print_explain(FILE *f)
 {
-	fprintf(f, "Usage: ... bond_slave [ queue_id ID ] [ prio PRIORITY ]\n");
+	fprintf(f, "Usage: ... bond_slave [ queue_id ID ] [ prio PRIORITY ]\n"
+		   "                      [ ad_actor_port_prio PRIORITY ]\n"
+	);
 }
 
 static void explain(void)
@@ -145,12 +147,18 @@ static void bond_slave_print_opt(struct link_util *lu, FILE *f, struct rtattr *t
 			  state);
 		print_slave_oper_state(f, "ad_partner_oper_port_state_str", state);
 	}
+
+	if (tb[IFLA_BOND_SLAVE_AD_ACTOR_PORT_PRIO])
+		print_int(PRINT_ANY,
+			  "ad_actor_port_prio",
+			  "ad_actor_port_prio %d ",
+			  rta_getattr_u16(tb[IFLA_BOND_SLAVE_AD_ACTOR_PORT_PRIO]));
 }
 
 static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
 				struct nlmsghdr *n)
 {
-	__u16 queue_id;
+	__u16 queue_id, ad_actor_port_prio;
 	int prio;
 
 	while (argc > 0) {
@@ -164,6 +172,12 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
 			if (get_s32(&prio, *argv, 0))
 				invarg("prio is invalid", *argv);
 			addattr32(n, 1024, IFLA_BOND_SLAVE_PRIO, prio);
+		} else if (strcmp(*argv, "ad_actor_port_prio") == 0) {
+			NEXT_ARG();
+			if (get_u16(&ad_actor_port_prio, *argv, 0))
+				invarg("actor prio is invalid", *argv);
+			addattr16(n, 1024, IFLA_BOND_SLAVE_AD_ACTOR_PORT_PRIO,
+				  ad_actor_port_prio);
 		} else {
 			if (matches(*argv, "help") != 0)
 				fprintf(stderr,
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index e3297c577152..5714dbecabcf 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -2846,6 +2846,12 @@ the following additional arguments are supported:
 (a 32bit signed value). This option only valid for active-backup(1),
 balance-tlb (5) and balance-alb (6) mode.
 
+.sp
+.BI ad_actor_port_prio " PRIORITY"
+- set the slave's ad actor port priority for 802.3ad aggregation selection
+logic during failover (a 16bit unsigned value). This option only valid for
+802.3ad (4) mode.
+
 .in -8
 
 .TP
-- 
2.46.0