4.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vlad Yasevich <vyasevich@xxxxxxxxx> [ Upstream commit 2836b4f224d4fd7d1a2b23c3eecaf0f0ae199a74 ] Since virtio does not provide it's own ndo_features_check handler, TSO, and now checksum offload, are disabled for stacked vlans. Re-enable the support and let the host take care of it. This restores/improves Guest-to-Guest performance over Q-in-Q vlans. Acked-by: Jason Wang <jasowang@xxxxxxxxxx> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> Signed-off-by: Vladislav Yasevich <vyasevic@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/virtio_net.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1894,6 +1894,7 @@ static const struct net_device_ops virtn .ndo_poll_controller = virtnet_netpoll, #endif .ndo_xdp = virtnet_xdp, + .ndo_features_check = passthru_features_check, }; static void virtnet_config_changed_work(struct work_struct *work)