From: Jason Wang <jasow...@redhat.com> Date: Thu, 22 Nov 2018 14:36:30 +0800
> We don't disable VIRTIO_NET_F_GUEST_CSUM if XDP was set. This means we > can receive partial csumed packets with metadata kept in the > vnet_hdr. This may have several side effects: > > - It could be overridden by header adjustment, thus is might be not > correct after XDP processing. > - There's no way to pass such metadata information through > XDP_REDIRECT to another driver. > - XDP does not support checksum offload right now. > > So simply disable guest csum if possible in this the case of XDP. > > Fixes: 3f93522ffab2d ("virtio-net: switch off offloads on demand if possible > on XDP set") > Reported-by: Jesper Dangaard Brouer <bro...@redhat.com> > Cc: Jesper Dangaard Brouer <bro...@redhat.com> > Cc: Pavel Popa <pashinho1...@gmail.com> > Cc: David Ahern <dsah...@gmail.com> > Signed-off-by: Jason Wang <jasow...@redhat.com> Applied and queued up for -stable. We really should have a way to use the checksum provided if the XDP program returns XDP_PASS and does not modify the packet contents or size.