[PATCHv2 iproute2-next] iplink: bond_slave: add per port prio support

[Hangbin Liu <liuhangbin@gmail.com>]

Add per port priority support for active slave re-selection during
bonding failover. A higher number means higher priority.

This option is only valid for active-backup(1), balance-tlb (5) and
balance-alb (6) mode.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
v2: update man page
---
 ip/iplink_bond_slave.c | 12 +++++++++++-
 man/man8/ip-link.8.in  |  8 ++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/ip/iplink_bond_slave.c b/ip/iplink_bond_slave.c
index d488aaab..8103704b 100644
--- a/ip/iplink_bond_slave.c
+++ b/ip/iplink_bond_slave.c
@@ -19,7 +19,7 @@
 
 static void print_explain(FILE *f)
 {
-	fprintf(f, "Usage: ... bond_slave [ queue_id ID ]\n");
+	fprintf(f, "Usage: ... bond_slave [ queue_id ID ] [ prio PRIORITY ]\n");
 }
 
 static void explain(void)
@@ -120,6 +120,10 @@ static void bond_slave_print_opt(struct link_util *lu, FILE *f, struct rtattr *t
 			  "queue_id %d ",
 			  rta_getattr_u16(tb[IFLA_BOND_SLAVE_QUEUE_ID]));
 
+	if (tb[IFLA_BOND_SLAVE_PRIO])
+		print_int(PRINT_ANY, "prio", "prio %d ",
+			  rta_getattr_s32(tb[IFLA_BOND_SLAVE_PRIO]));
+
 	if (tb[IFLA_BOND_SLAVE_AD_AGGREGATOR_ID])
 		print_int(PRINT_ANY,
 			  "ad_aggregator_id",
@@ -151,6 +155,7 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
 				struct nlmsghdr *n)
 {
 	__u16 queue_id;
+	int prio;
 
 	while (argc > 0) {
 		if (matches(*argv, "queue_id") == 0) {
@@ -158,6 +163,11 @@ static int bond_slave_parse_opt(struct link_util *lu, int argc, char **argv,
 			if (get_u16(&queue_id, *argv, 0))
 				invarg("queue_id is invalid", *argv);
 			addattr16(n, 1024, IFLA_BOND_SLAVE_QUEUE_ID, queue_id);
+		} else if (strcmp(*argv, "prio") == 0) {
+			NEXT_ARG();
+			if (get_s32(&prio, *argv, 0))
+				invarg("prio is invalid", *argv);
+			addattr32(n, 1024, IFLA_BOND_SLAVE_PRIO, 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 6f332645..3dbcdbb6 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -2567,6 +2567,8 @@ the following additional arguments are supported:
 .B "ip link set type bond_slave"
 [
 .BI queue_id " ID"
+] [
+.BI prio " PRIORITY"
 ]
 
 .in +8
@@ -2574,6 +2576,12 @@ the following additional arguments are supported:
 .BI queue_id " ID"
 - set the slave's queue ID (a 16bit unsigned value).
 
+.sp
+.BI prio " PRIORITY"
+- set the slave's priority for active slave re-selection during failover
+(a 32bit signed value). This option only valid for active-backup(1),
+balance-tlb (5) and balance-alb (6) mode.
+
 .in -8
 
 .TP
-- 
2.35.1