virtio-net: enable TSO/checksum offloads for Q-in-Q vlans

[ 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@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f36584616e7d6825c7e69137b4a31a3d55779688..d9d8f4f43f9027bb409b35ac06c35f743f22a53b 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1894,6 +1894,7 @@ static const struct net_device_ops virtnet_netdev = {
        .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)