From: Chris Wright <chrisw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Jesse Gross <jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
Cc: dev-yBygre7rU0TnMu66kgdUjQ@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
chrisw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Subject: Re: [PATCH net-next 4/7] openvswitch: Reset upper layer protocol info on internal devices.
Date: Tue, 4 Sep 2012 11:23:04 -0700 [thread overview]
Message-ID: <20120904182304.GD26249@x200.localdomain> (raw)
In-Reply-To: <CAEP_g=_+Q4Axi0vH8nce6zVZgs++62PbiTWum_z+s_PbpwzgOA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
* Jesse Gross (jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org) wrote:
> On Mon, Sep 3, 2012 at 6:00 PM, David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org> wrote:
> > From: Jesse Gross <jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
> > Date: Mon, 3 Sep 2012 17:57:39 -0700
> >
> >> On Fri, Jul 20, 2012 at 3:26 PM, Jesse Gross <jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org> 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-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
> >>
> >> 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.
I've not hit the bug myself, but been made aware of the issue from
OpenStack/Quantum folks.
There's a testing scenario that hits this as described in this launchpad
bug:
https://bugs.launchpad.net/quantum/+bug/1044318
thanks,
-chris
next prev parent reply other threads:[~2012-09-04 18:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 22:26 [GIT net-next] Open vSwitch Jesse Gross
[not found] ` <1342823210-3308-1-git-send-email-jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2012-07-20 22:26 ` [PATCH net-next 1/7] openvswitch: Enable retrieval of TCP flags from IPv6 traffic Jesse Gross
2012-07-20 22:26 ` [PATCH net-next 2/7] openvswitch: Do not send notification if ovs_vport_set_options() failed Jesse Gross
2012-07-20 22:26 ` [PATCH net-next 3/7] openvswitch: Replace Nicira Networks Jesse Gross
2012-07-20 22:26 ` [PATCH net-next 4/7] openvswitch: Reset upper layer protocol info on internal devices Jesse Gross
[not found] ` <1342823210-3308-5-git-send-email-jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
2012-09-04 0:57 ` Jesse Gross
[not found] ` <CAEP_g=-giF74zveQgLsrAwS0kp2P3cj_O7mHaKKLVfKwQCNBag-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-09-04 1:00 ` David Miller
[not found] ` <20120903.210055.1839817610578900310.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2012-09-04 1:07 ` Jesse Gross
[not found] ` <CAEP_g=_+Q4Axi0vH8nce6zVZgs++62PbiTWum_z+s_PbpwzgOA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-09-04 18:22 ` David Miller
2012-09-04 18:23 ` Chris Wright [this message]
2012-07-20 22:26 ` [PATCH net-next 5/7] openvswitch: Check currect return value from skb_gso_segment() Jesse Gross
2012-07-20 22:26 ` [PATCH net-next 6/7] openvswitch: Check gso_type for correct sk_buff in queue_gso_packets() Jesse Gross
2012-07-20 22:26 ` [PATCH net-next 7/7] openvswitch: Fix typo in documentation Jesse Gross
2012-07-20 23:17 ` [GIT net-next] Open vSwitch David Miller
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