APPLIED[Yakkety]: [PATCH v2 0/3][Yakkety][SRU] virtio: fix xmit packet flag settings

[Stefan Bader]

On 20.04.2017 18:14, Jay Vosburgh wrote:
> BugLink: https://bugs.launchpad.net/bugs/1683947
> 
> 	Beginning with fd2a0437dc33 ("virtio_net: introduce
> virtio_net_hdr_{from,to}_skb"), virtio_net incorrectly sets
> VIRTIO_NET_HDR_F_DATA_VALID on CHECKSUM_UNNECESSARY packets.  If these
> packets are modified prior to transmission (e.g., by NAT), they are
> dropped by the receving virtio.  I suspect (but have not confirmed
> experimentally) that this is because the checksum is incorrect after NAT
> modifies the packet, but the checksum is not recomputed.
> 
> 	Patch 1/3, 3e9e40e74753 ("virtio_net: Simplify call sites for
> virtio_net_hdr_{from, to}_skb()."), is a prerequisite to permit patch 3/3,
> 6391a4481ba0, to apply more easily and end up with the final code closer
> to mainline.
> 
> 	Patch 2/3, 501db511397f ("virtio: don't set
> VIRTIO_NET_HDR_F_DATA_VALID on xmit") was found by bisect to initially
> resolve the issue.
> 
> 	Patch 3/3, 6391a4481ba0 ("virtio-net: restore
> VIRTIO_HDR_F_DATA_VALID on receiving") is a follow-on to 501db511397f for
> the complete fix.
> 
> 	As the issue was introduced during 4.8-rc and resolved before 4.10
> release, this bug exists only in the Ubuntu Yakkety 4.8 kernel series.
> 
> v2: fixed cherry pick commit id in patch 2/3
> 
> 	-J
> 
> ---
> 	-Jay Vosburgh, jay.vosburgh at canonical.com
> 


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