netdev - Re: [PATCH 5/5] net/core: Allow receive on active slaves.

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Message-Id: <20080705.213818.71574869.davem@davemloft.net>
Date:	Sat, 05 Jul 2008 21:38:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jre@...vasystems.com
Cc:	jgarzik@...ox.com, fubar@...ibm.com, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] net/core: Allow receive on active slaves.

From: Joe Eykholt <jre@...vasystems.com>
Date: Sat, 05 Jul 2008 21:36:42 -0700

> David Miller wrote:
> > From: Jeff Garzik <jgarzik@...ox.com>
> > Date: Fri, 04 Jul 2008 08:45:52 -0400
> > 
> >> Jay Vosburgh wrote:
> >>> @@ -2104,7 +2104,8 @@ int netif_receive_skb(struct sk_buff *skb)
> >>>  #endif
> >>>  
> >>>  	list_for_each_entry_rcu(ptype, &ptype_all, list) {
> >>> -		if (ptype->dev == null_or_orig || ptype->dev == skb->dev) {
> >>> +		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
> >>> +		    ptype->dev == orig_dev) {
> >>>  			if (pt_prev)
> >>>  				ret = deliver_skb(skb, pt_prev, orig_dev);
> >>>  			pt_prev = ptype;
> >>> @@ -2129,7 +2130,8 @@ ncls:
> >>>  	list_for_each_entry_rcu(ptype,
> >>>  			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
> >>>  		if (ptype->type == type &&
> >>> -		    (ptype->dev == null_or_orig || ptype->dev == skb->dev)) {
> >>> +		    (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
> >>> +		     ptype->dev == orig_dev)) {
> >>>  			if (pt_prev)
> >> This needs a review&ack from David, then OK...
> > 
> > I fear this bit of the changes will break AF_PACKET device binding.
> > So for example, if a tap registers it wants to hear eth0, it will now
> > hear bond0 as well as eth0 if eth0 is a part of bond0.
> 
> Each ptype will get matched and delivered to at most once.  So if 
> someone binds AF_PACKET to only eth0, they'll only see the packet once.
> Whereas before patch 4, the frame wouldn't be delivered to them
> at all, since skb->dev has already been changed to the bond.

Ok, that works.

Jeff, I ACK this patch and the others that go with it:

Acked-by: David S. Miller <davem@...emloft.net>
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