Re: [PATCH] bonding: allow bond in mode balance-alb to work properly in bridge -try3

Jiri Pirko
2009-03-26T11:15:19Z

Wed, Mar 25, 2009 at 05:31:53PM CET, fubar@us.ibm.com wrote:
>>@@ -2251,10 +2258,12 @@ int netif_receive_skb(struct sk_buff *skb)
>> null_or_orig = NULL;
>> orig_dev = skb->dev;
>> if (orig_dev->master) {
>>- if (skb_bond_should_drop(skb))
>>+ if (skb_bond_should_drop(skb)) {
>> null_or_orig = orig_dev; /* deliver only exact match */
>>- else
>>+ } else {
>> skb->dev = orig_dev->master;
>>+ bond_change_dest_hook(skb);
>
> Since you put the hook outside of the skb_bond_should_drop
>function, does the VLAN accelerated receive path do the right thing if,
>e.g., there's a VLAN on top of bonding and that VLAN is part of the
>bridge?

Don't worry :) I did not forget about this - just needed a bit time to
investigate...

Yeah, this look's like a problem. In __vlan_hwaccel_rx there is following line:
skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
This rewrites the dev so latter on when netif_receive_skb is called the hook
will be not called (because dev->master will not be set).

Ok I will put the hook inside the skb_bond_should_drop() - it seems like a
correct solution...

Thanks for pointing this out.
>
> -J
>
>---
> -Jay Vosburgh, IBM Linux Technology Center, fubar@us.ibm.com