netdev - Re: [PATCH net] udptunnel: Add SKB_GSO_UDP_TUNNEL during gro

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Message-ID: <CAEP_g=9TzDFwgFKynXXJKGYrnKJ8xNHAg0zSX9+D1rCpO9umzw@mail.gmail.com>
Date:	Mon, 10 Nov 2014 11:45:57 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	David Miller <davem@...emloft.net>
Cc:	Jay Vosburgh <jay.vosburgh@...onical.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net] udptunnel: Add SKB_GSO_UDP_TUNNEL during gro_complete.

On Mon, Nov 10, 2014 at 11:33 AM, David Miller <davem@...emloft.net> wrote:
> From: Jesse Gross <jesse@...ira.com>
> Date: Fri, 7 Nov 2014 19:54:51 -0800
>
>> On Fri, Nov 7, 2014 at 5:51 PM, Jay Vosburgh <jay.vosburgh@...onical.com> wrote:
>>> Jesse Gross <jesse@...ira.com> wrote:
>>>
>>>>When doing GRO processing for UDP tunnels, we never add
>>>>SKB_GSO_UDP_TUNNEL to gso_type - only the type of the inner protocol
>>>>is added (such as SKB_GSO_TCPV4). The result is that if the packet is
>>>>later resegmented we will do GSO but not treat it as a tunnel. This
>>>>results in UDP fragmentation and since that is not the original layout
>>>>of the skb, a panic in skb_segment().
>>>>
>>>>Reported-by: Jay Vosburgh <jay.vosburgh@...onical.com>
>>>>Signed-off-by: Jesse Gross <jesse@...ira.com>
>>>>---
>>>>This problem occurs back to 3.14 for VXLAN but the FOU portion needs to
>>>>be removed for kernels other than the 'net' tree.
>>>
>>>         This patch does not resolve the problem when applied to a
>>> 3.17-ish kernel; the panic message is below, and appears to be
>>> unchanged.
>>
>> Hmm, OK, thanks for testing. I think this patch is probably still good
>> to apply as it may solve a problem after we get this one figured out.
>
> But if you want that to happen, you'll have to adjust the commit
> message because it doesn't fix the crash reported by Jay at all.

Sure, I've resent it with a new commit message.
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