netdev - Re: [patch net-next-2.6 1/6] af_packet: use skb->skb_iif instead of orig

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Date:	Mon, 14 Mar 2011 23:10:45 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	shemminger@...ux-foundation.org, kaber@...sh.net, fubar@...ibm.com,
	eric.dumazet@...il.com, nicolas.2p.debian@...il.com,
	andy@...yhouse.net
Subject: Re: [patch net-next-2.6 1/6] af_packet: use skb->skb_iif instead of orig_dev->ifindex

On Mon, Mar 14, 2011 at 3:43 PM, Jiri Pirko <jpirko@...hat.com> wrote:
> Mon, Mar 14, 2011 at 07:59:39AM CET, xiaosuo@...il.com wrote:
>>>
>>
>>1557 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
>>....
>>
>>1571                         if (pt_prev) {
>>1572                                 deliver_skb(skb2, pt_prev, skb->dev);
>>1573                                 pt_prev = ptype;
>>1574                                 continue;
>>1575                         }
>>...
>>1603         }
>>1604         if (pt_prev)
>>1605                 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
>>1606         rcu_read_unlock();
>>1607 }
>
> I'm probably missign something but I do not see the connection between
> this and setting up sll->sll_ifindex in net/packet/af_packet.c
>

Think about a packet socket(with origdev set) for packets emitted via
NIC eth0, and sll->sll_ifindex is eth0->ifindex, but after your patch,
sll->sll_ifindex may be ZERO or the ifindex of the RX NIC for the
forwarded packets. However, I don't know if this origdev usage is
valid. Thanks.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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