From: Peter Pan(潘卫平) Date: Sat, 17 Mar 2012 17:23:27 +0000 (+0000) Subject: bonding: send igmp report for its master X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1c3ac4289a0e4d60cbd4787b4a91de4a0c785df1;p=openwrt%2Fstaging%2Fblogic.git bonding: send igmp report for its master Liang Zheng(lzheng@redhat.com) found that in the following topo, bonding does not send igmp report when we trigger a fail-over of bonding. eth0-- |-- bond0 -- br0 eth1-- modprobe bonding mode=1 miimon=100 resend_igmp=10 ifconfig bond0 up ifenslave bond0 eth0 eth1 brctl addbr br0 ifconfig br0 192.168.100.2/24 up brctl addif br0 bond0 Add 192.168.100.2(br0) into a multicast group, like 224.10.10.10, then trigger a fali-over in bonding. You can see that parameter "resend_igmp" does not work. The reason is that when we add br0 into a multicast group, it does not propagate multicast knowledge down to its ports. If we choose to propagate multicast knowledge down to all ports for bridge, then we have to track every change that is done to bridge, and keep a backup for all ports. It is hard to track, I think. Instead I choose to modify bonding to send igmp report for its master. Changelog: V2: correct comments V3: move this check into bond_resend_igmp_join_requests() V4: only send igmp reports if bond is enslaved to a bridge Signed-off-by: Weiping Pan Signed-off-by: David S. Miller --- diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 435984ad8b2f..0730203a19f2 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -766,18 +766,30 @@ static void __bond_resend_igmp_join_requests(struct net_device *dev) */ static void bond_resend_igmp_join_requests(struct bonding *bond) { - struct net_device *vlan_dev; + struct net_device *bond_dev, *vlan_dev, *master_dev; struct vlan_entry *vlan; read_lock(&bond->lock); + bond_dev = bond->dev; + /* rejoin all groups on bond device */ - __bond_resend_igmp_join_requests(bond->dev); + __bond_resend_igmp_join_requests(bond_dev); + + /* + * if bond is enslaved to a bridge, + * then rejoin all groups on its master + */ + master_dev = bond_dev->master; + if (master_dev) + if ((master_dev->priv_flags & IFF_EBRIDGE) + && (bond_dev->priv_flags & IFF_BRIDGE_PORT)) + __bond_resend_igmp_join_requests(master_dev); /* rejoin all groups on vlan devices */ list_for_each_entry(vlan, &bond->vlan_list, vlan_list) { rcu_read_lock(); - vlan_dev = __vlan_find_dev_deep(bond->dev, + vlan_dev = __vlan_find_dev_deep(bond_dev, vlan->vlan_id); rcu_read_unlock(); if (vlan_dev)