netdev - Re: [PATCH v4 net-next] net: introduce dev_set

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Message-Id: <20131107.161755.355597965034457889.davem@davemloft.net>
Date:	Thu, 07 Nov 2013 16:17:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bhutchings@...arflare.com
Cc:	eric.dumazet@...il.com, christoph.paasch@...ouvain.be,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: [PATCH v4 net-next] net: introduce dev_set_forwarding()

From: Ben Hutchings <bhutchings@...arflare.com>
Date: Mon, 4 Nov 2013 16:55:30 +0000

> On Sat, 2013-11-02 at 12:58 -0700, Eric Dumazet wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>> 
>> Christoph Paasch and Jerry Chu reported crashes in skb_segment() caused
>> by commit 8a29111c7ca6 ("net: gro: allow to build full sized skb")
>> 
>> skb_segment() only deals with a frag_list chain containing MSS sized
>> fragments. Even if we fix this problem, its better if GRO layer
>> doesn't build skb with a frag_list in the first place, to let TSO
>> packets reaching output devices.
>>  
>> David Miller and Ben Hutchings suggested we keep track of number of
>> forwarding users to be able to :
>> 
>> - Disable LRO
>> - Make sure GRO layer do not use skb frag_list to extend skb capacity
>> 
>> Note that after this patch, LRO is automatically re-enabled if
>> forwarding is disabled on the device, or if a device is removed
>> from a bridge.
> [...]
> 
> Reviewed-by: Ben Hutchings <bhutchings@...arflare.com>

Applied, thanks everyone.
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