net: convert resend IGMP to notifier event

Until now, bond_resend_igmp_join_requests() looks for vlans attached to
bonding device, bridge where bonding act as port manually. It does not
care of other scenarios, like stacked bonds or team device above. Make
this more generic and use netdev notifier to propagate the event to
upper devices and to actually call ip_mc_rejoin_groups().

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 35 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 07f257d44a1e..ae9864c9fa38 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -715,15 +715,6 @@ static int bond_set_allmulti(struct bonding *bond, int inc)
 	return err;
 }
 
-static void __bond_resend_igmp_join_requests(struct net_device *dev)
-{
-	struct in_device *in_dev;
-
-	in_dev = __in_dev_get_rcu(dev);
-	if (in_dev)
-		ip_mc_rejoin_groups(in_dev);
-}
-
 /*
  * Retrieve the list of registered multicast addresses for the bonding
  * device and retransmit an IGMP JOIN request to the current active
@@ -731,33 +722,12 @@ static void __bond_resend_igmp_join_requests(struct net_device *dev)
  */
 static void bond_resend_igmp_join_requests(struct bonding *bond)
 {
-	struct net_device *bond_dev, *vlan_dev, *upper_dev;
-	struct vlan_entry *vlan;
-
-	read_lock(&bond->lock);
-	rcu_read_lock();
-
-	bond_dev = bond->dev;
-
-	/* rejoin all groups on bond device */
-	__bond_resend_igmp_join_requests(bond_dev);
-
-	/*
-	 * if bond is enslaved to a bridge,
-	 * then rejoin all groups on its master
-	 */
-	upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
-	if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
-		__bond_resend_igmp_join_requests(upper_dev);
-
-	/* rejoin all groups on vlan devices */
-	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
-		vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q),
-						vlan->vlan_id);
-		if (vlan_dev)
-			__bond_resend_igmp_join_requests(vlan_dev);
+	if (!rtnl_trylock()) {
+		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
+		return;
 	}
-	rcu_read_unlock();
+	call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
+	rtnl_unlock();
 
 	/* We use curr_slave_lock to protect against concurrent access to
 	 * igmp_retrans from multiple running instances of this function and
@@ -3234,6 +3204,10 @@ static int bond_slave_netdev_event(unsigned long event,
 	case NETDEV_FEAT_CHANGE:
 		bond_compute_features(bond);
 		break;
+	case NETDEV_RESEND_IGMP:
+		/* Propagate to master device */
+		call_netdevice_notifiers(event, slave->bond->dev);
+		break;
 	default:
 		break;
 	}