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

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Message-ID: <CAEP_g=_+Q4Axi0vH8nce6zVZgs++62PbiTWum_z+s_PbpwzgOA@mail.gmail.com>
Date:	Mon, 3 Sep 2012 18:07:29 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	David Miller <davem@...emloft.net>
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.

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.
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