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    Subject[PATCH 4.9 30/94] virtio-net: enable TSO/checksum offloads for Q-in-Q vlans
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Vlad Yasevich <vyasevich@gmail.com>


    [ 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>
    ---
    drivers/net/virtio_net.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/net/virtio_net.c
    +++ b/drivers/net/virtio_net.c
    @@ -1456,6 +1456,7 @@ static const struct net_device_ops virtn
    #ifdef CONFIG_NET_RX_BUSY_POLL
    .ndo_busy_poll = virtnet_busy_poll,
    #endif
    + .ndo_features_check = passthru_features_check,
    };

    static void virtnet_config_changed_work(struct work_struct *work)

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