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    SubjectRe: [PATCH 3.17 023/319] drivers/net: Disable UFO through virtio
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    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@decadent.org.uk>
    >>
    >> [ 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?

    thanks,
    - --
    js
    suse labs
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