From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Thu, 31 May 2018 09:00:08 +0000 (+0200)
Subject: virtio_net: implement flush flag for ndo_xdp_xmit
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5d274cb4bbae481161737a1f652e276883d3d970;p=linux.git

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>
---

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 4ed823625953b..62ba8aadd8e68 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;
 }