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    Subject[PATCH 3.11 069/144] virtio-net: alloc big buffers also when guest can receive UFO
    Date
    3.11.10.7 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Jason Wang <jasowang@redhat.com>

    commit 0e7ede80d929ff0f830c44a543daa1acd590c749 upstream.

    We should alloc big buffers also when guest can receive UFO
    packets to let the big packets fit into guest rx buffer.

    Fixes 5c5167515d80f78f6bb538492c423adcae31ad65
    (virtio-net: Allow UFO feature to be set and advertised.)

    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Cc: Michael S. Tsirkin <mst@redhat.com>
    Cc: Sridhar Samudrala <sri@us.ibm.com>
    Signed-off-by: Jason Wang <jasowang@redhat.com>
    Acked-by: Michael S. Tsirkin <mst@redhat.com>
    Acked-by: Rusty Russell <rusty@rustcorp.com.au>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/net/virtio_net.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
    index a0c05e0..2835bfe 100644
    --- a/drivers/net/virtio_net.c
    +++ b/drivers/net/virtio_net.c
    @@ -1597,7 +1597,8 @@ static int virtnet_probe(struct virtio_device *vdev)
    /* If we can receive ANY GSO packets, we must allocate large ones. */
    if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
    - virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
    + virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
    + virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
    vi->big_packets = true;

    if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
    --
    1.9.1


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