netdev - Re: [PATCH net] gre: Fix MTU sizing check for gretap tunnels

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Date:	Thu, 11 Jul 2013 16:30:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alexander.h.duyck@...el.com, netdev@...r.kernel.org,
	pshelar@...ira.com, jesse@...ira.com
Subject: Re: [PATCH net] gre: Fix MTU sizing check for gretap tunnels

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 11 Jul 2013 14:52:27 -0700

> On Thu, 2013-07-11 at 13:12 -0700, Alexander Duyck wrote:
>> This change fixes an MTU sizing issue seen with gretap tunnels when non-gso
>> packets are sent from the interface.
>> 
>> In my case I was able to reproduce the issue by simply sending a ping of
>> 1421 bytes with the gretap interface created on a device with a standard
>> 1500 mtu.
>> 
>> This fix is based on the fact that the tunnel mtu is already adjusted by
>> dev->hard_header_len so it would make sense that any packets being compared
>> against that mtu should also be adjusted by hard_header_len and the tunnel
>> header instead of just the tunnel header.
>> 
>> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
...
> Reported-by: Cong Wang <amwang@...hat.com>
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks everyone.
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