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On 11/13/2014, 07:35 PM, Ben Hutchings wrote:
> 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.
Great, I dropped that one.
Thanks!
- --
js
suse labs
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