netdev - Re: [PATCH] sky2: don't do GRO on second port

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Message-ID: <20100902122858.GC8775@ff.dom.local>
Date:	Thu, 2 Sep 2010 12:28:58 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: don't do GRO on second port

On Thu, Sep 02, 2010 at 02:09:09PM +0200, Eric Dumazet wrote:
> Le jeudi 02 septembre 2010 ?? 11:02 +0000, Jarek Poplawski a écrit :
> > On Thu, Sep 02, 2010 at 12:41:45PM +0200, Eric Dumazet wrote:
> 
> > > Two vlans might carry packets in different domains, with a clash of IP
> > > space and TCP flows. Even with a probability of 0.000000001%, we cannot
> > > ever merge two packets of different domains. Really !
> > 
> > Hmm... But there is only a question of sky2 and this test in
> > __napi_gro_receive().
> > 
> 
> Any driver can receive in one napi run :
> 
> 1) A TCP tagged frame for vlan 345, delivered to vlan_gro_receive(),
> queued in napi->gro_list.
> 
> 2) An untagged frame, delived via napi_gro_receive()
>     Can meet previous frame in napi->gro_list. Should not merge.
> 
> So napi_gro_receive() must perform the same skb->dev check, sky2 or not.

But of course!!! I was mislead by Stephen's changelog so much. So now
I really can't understand this current: "sky2: don't do GRO on second
port"...

Thanks,
Jarek P.
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