netdev - Re: [PATCH v2] net: core: don't account for udp header size when computing seglen

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Message-Id: <20140410.214254.1339000250746969664.davem@davemloft.net>
Date:	Thu, 10 Apr 2014 21:42:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fw@...len.de
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH v2] net: core: don't account for udp header size when
 computing seglen

From: Florian Westphal <fw@...len.de>
Date: Wed,  9 Apr 2014 10:28:50 +0200

> In case of tcp, gso_size contains the tcpmss.
> 
> For UFO (udp fragmentation offloading) skbs, gso_size is the fragment
> payload size, i.e. we must not account for udp header size.
> 
> Otherwise, when using virtio drivers, a to-be-forwarded UFO GSO packet
> will be needlessly fragmented in the forward path, because we think its
> individual segments are too large for the outgoing link.
> 
> Fixes: fe6cc55f3a9a053 ("net: ip, ipv6: handle gso skbs in forwarding path")
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Reported-by: Tobias Brunner <tobias@...ongswan.org>
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  changes since v1:
>   - update 'Fixes:' tag.

Applied and queued up for -stable, thanks!
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