From: Jason Wang <jasowang@redhat.com>
Date: Tue, 22 May 2018 03:44:29 +0000 (+0800)
Subject: virtio-net: correctly transmit XDP buff after linearizing
X-Git-Tag: v4.19~982^2~20^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5d458a13dd59d04b4d6658a6d5b94d42732b15ae;p=platform%2Fkernel%2Flinux-rpi.git

virtio-net: correctly transmit XDP buff after linearizing

We should not go for the error path after successfully transmitting a
XDP buffer after linearizing. Since the error path may try to pop and
drop next packet and increase the drop counters. Fixing this by simply
drop the refcnt of original page and go for xmit path.

Fixes: 72979a6c3590 ("virtio_net: xdp, add slowpath case for non contiguous buffers")
Cc: John Fastabend <john.fastabend@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index c15d240..6260d65 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -775,7 +775,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 			}
 			*xdp_xmit = true;
 			if (unlikely(xdp_page != page))
-				goto err_xdp;
+				put_page(page);
 			rcu_read_unlock();
 			goto xdp_xmit;
 		case XDP_REDIRECT: