netdev - [bpf-next V1 PATCH 5/8] virtio_net: implement flush flag for ndo_xdp

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Message-ID: <152770325822.20510.17161136457044557614.stgit@firesoul>
Date:   Wed, 30 May 2018 20:00:58 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     netdev@...r.kernel.org, Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        makita.toshiaki@....ntt.co.jp
Subject: [bpf-next V1 PATCH 5/8] virtio_net: implement flush flag for
 ndo_xdp_xmit

Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 drivers/net/virtio_net.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

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;
 }