On Thu, 2014-11-13 at 18:48 +0100, Jiri Slaby wrote:
> On 11/12/2014, 10:03 PM, Ben Hutchings wrote:
> > On Wed, 2014-11-12 at 10:12 +0900, Greg Kroah-Hartman wrote:
> >> 3.17-stable review patch. If anyone has any objections, please
> >> let me know.
> >>
> >> ------------------
> >>
> >> From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> >>
> >> [ Upstream commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4 ]
> >>
> >> IPv6 does not allow fragmentation by routers, so there is no
> >> fragmentation ID in the fixed header. UFO for IPv6 requires the
> >> ID to be passed separately, but there is no provision for this in
> >> the virtio net protocol.
> >>
> >> Until recently our software implementation of UFO/IPv6 generated
> >> a new ID, but this was a bug. Now we will use ID=0 for any
> >> UFO/IPv6 packet passed through a tap, which is even worse.
> >>
> >> Unfortunately there is no distinction between UFO/IPv4 and v6
> >> features, so disable UFO on taps and virtio_net completely until
> >> we have a proper solution.
> > [...]
> >
> > Please drop this patch for 3.14 and 3.17. It causes problems for
> > migration of VMs and we're probably going to revert part of this.
> > The following patch ("drivers/net, ipv6: Select IPv6 fragment
> > idents for virtio UFO packets") might no longer apply, in which
> > case you can drop that as well until we have this sorted out
> > upstream.
>
> The same holds for 3.12, I suppose?
Right.
Ben.
--
Ben Hutchings
friends: People who know you well, but like you anyway.
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