rds: ib: __flush_neigh_conn error messages in syslog during failover/failback

If RDS fails to find the device for an IP address when flushing the
neighbor cache, it is likely be caused by the IP address being moved due to
a failover/failback. Do not log an error in this case.

Orabug: 30478312

Signed-off-by: Dag Moxnes <[email protected]>
Reviewed-by: Ka-Cheong Poon <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: Dag Moxnes

net/rds/ib.c

@@ -886,7 +886,9 @@ static void __flush_neigh_conn(struct net *net,
 	isv4 = ipv6_addr_v4mapped(faddr);
 
 	/* Use our local address to find the right interface to flush the
-	 * neighbor address.
+	 * neighbor address. If we are unable to find the interface, this is
+	 * likely because the IP-address moved due to failover/failback, so
+	 * don't log any issues in this case.
 	 */
 	if (isv4) {
 		idx = __rds_find_ifindex_v4(net, laddr->s6_addr32[3]);
@@ -896,11 +898,8 @@ static void __flush_neigh_conn(struct net *net,
 		addrlen = sizeof(*faddr);
 	}
 
-	if (!idx) {
-		pr_err_ratelimited("%s: cannot find %pI6c interface\n",
-				   __func__, laddr);
+	if (!idx)
 		return;
-	}
 
 	buflen = nlmsg_total_size(sizeof(*ndm) +
 				  nla_total_size(addrlen));