---

yaml
---
r: 189178
b: refs/heads/master
c: a2fd940
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 44ebb95290afcc687511ad3f7fd6434e867c270a
+refs/heads/master: a2fd940f4cff74b932728bd6ca12848da21a0234

trunk/drivers/net/bonding/bond_main.c

@@ -1235,6 +1235,11 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 			write_lock_bh(&bond->curr_slave_lock);
 		}
 	}
+
+	/* resend IGMP joins since all were sent on curr_active_slave */
+	if (bond->params.mode == BOND_MODE_ROUNDROBIN) {
+		bond_resend_igmp_join_requests(bond);
+	}
 }
 
 /**
@@ -4138,22 +4143,41 @@ static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev
 	struct bonding *bond = netdev_priv(bond_dev);
 	struct slave *slave, *start_at;
 	int i, slave_no, res = 1;
+	struct iphdr *iph = ip_hdr(skb);
 
 	read_lock(&bond->lock);
 
 	if (!BOND_IS_OK(bond))
 		goto out;
-
 	/*
-	 * Concurrent TX may collide on rr_tx_counter; we accept that
-	 * as being rare enough not to justify using an atomic op here
+	 * Start with the curr_active_slave that joined the bond as the
+	 * default for sending IGMP traffic.  For failover purposes one
+	 * needs to maintain some consistency for the interface that will
+	 * send the join/membership reports.  The curr_active_slave found
+	 * will send all of this type of traffic.
 	 */
-	slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
+	if ((iph->protocol == htons(IPPROTO_IGMP)) &&
+	    (skb->protocol == htons(ETH_P_IP))) {
 
-	bond_for_each_slave(bond, slave, i) {
-		slave_no--;
-		if (slave_no < 0)
-			break;
+		read_lock(&bond->curr_slave_lock);
+		slave = bond->curr_active_slave;
+		read_unlock(&bond->curr_slave_lock);
+
+		if (!slave)
+			goto out;
+	} else {
+		/*
+		 * Concurrent TX may collide on rr_tx_counter; we accept
+		 * that as being rare enough not to justify using an
+		 * atomic op here.
+		 */
+		slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
+
+		bond_for_each_slave(bond, slave, i) {
+			slave_no--;
+			if (slave_no < 0)
+				break;
+		}
 	}
 
 	start_at = slave;