netdev - Re: [PATCH v2 net-next] inet: fix a UFO regression

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Message-Id: <20131108.020828.965655576855775437.davem@redhat.com>
Date:	Fri, 08 Nov 2013 02:08:28 -0500 (EST)
From:	David Miller <davem@...hat.com>
To:	eric.dumazet@...il.com
Cc:	ast@...mgrid.com, netdev@...r.kernel.org,
	hannes@...essinduktion.org
Subject: Re: [PATCH v2 net-next] inet: fix a UFO regression

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 07 Nov 2013 18:32:06 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> While testing virtio_net and skb_segment() changes, Hannes reported
> that UFO was sending wrong frames.
> 
> It appears this was introduced by a recent commit :
> 8c3a897bfab1 ("inet: restore gso for vxlan")
> 
> The old condition to perform IP frag was :
> 
> tunnel = !!skb->encapsulation;
> ...
>         if (!tunnel && proto == IPPROTO_UDP) {
> 
> So the new one should be :
> 
> udpfrag = !skb->encapsulation && proto == IPPROTO_UDP;
> ...
>         if (udpfrag) {
> 
> Initialization of udpfrag must be done before call
> to ops->callbacks.gso_segment(skb, features), as
> skb_udp_tunnel_segment() clears skb->encapsulation
> 
> (We want udpfrag to be true for UFO, false for VXLAN)
> 
> With help from Alexei Starovoitov
> 
> Reported-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks a lot Eric.
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