virtio_net: implement flush flag for ndo_xdp_xmit

When passed the XDP_XMIT_FLUSH flag virtnet_xdp_xmit now performs the
same virtqueue_kick as virtnet_xdp_flush.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4ed823625953..62ba8aadd8e6 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -481,7 +481,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
         int err;
         int i;
 
-        if (unlikely(flags & ~XDP_XMIT_FLAGS_NONE))
+        if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
                 return -EINVAL;
 
         qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
@@ -507,6 +507,10 @@ static int virtnet_xdp_xmit(struct net_device *dev,
                         drops++;
                 }
         }
+
+        if (flags & XDP_XMIT_FLUSH)
+                virtqueue_kick(sq->vq);
+
         return n - drops;
 }