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

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Message-ID: <1383584130.1553.2.camel@bwh-desktop.uk.level5networks.com>
Date:	Mon, 4 Nov 2013 16:55:30 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	<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()

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>


-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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