netdev - Re: [PATCH net-next 4/7] openvswitch: Reset upper layer protocol info on internal devices.

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Message-Id: <20120904.142231.400207154058939780.davem@davemloft.net>
Date:	Tue, 04 Sep 2012 14:22:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jesse@...ira.com
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org, chrisw@...hat.com
Subject: Re: [PATCH net-next 4/7] openvswitch: Reset upper layer protocol
 info on internal devices.

From: Jesse Gross <jesse@...ira.com>
Date: Mon, 3 Sep 2012 18:07:29 -0700

> On Mon, Sep 3, 2012 at 6:00 PM, David Miller <davem@...emloft.net> wrote:
>> From: Jesse Gross <jesse@...ira.com>
>> Date: Mon, 3 Sep 2012 17:57:39 -0700
>>
>>> On Fri, Jul 20, 2012 at 3:26 PM, Jesse Gross <jesse@...ira.com> wrote:
>>>> It's possible that packets that are sent on internal devices (from
>>>> the OVS perspective) have already traversed the local IP stack.
>>>> After they go through the internal device, they will again travel
>>>> through the IP stack which may get confused by the presence of
>>>> existing information in the skb. The problem can be observed
>>>> when switching between namespaces. This clears out that information
>>>> to avoid problems but deliberately leaves other metadata alone.
>>>> This is to provide maximum flexibility in chaining together OVS
>>>> and other Linux components.
>>>>
>>>> Signed-off-by: Jesse Gross <jesse@...ira.com>
>>>
>>> It was recently discovered that the bug that this patch fixes is
>>> causing problems in the real world.  Can you please queue this for
>>> stable in 3.4/3.5?  It's currently in Linus's tree as
>>> 7fe99e2d434eafeac0c57b279a77e5de39212636.
>>>
>>
>> What vendor is shipping openvswitch enabled and requires the fix to
>> be in -stable before they'll ship it to customers?
>>
>> That goes into what is 'real world'
> 
> Fedora is running into it I believe.  Chris Wright asked for it so he
> might be able to elaborate more on their plans.

Anyways, I've meanwhile queued it up for -stable, thanks.
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