netdev - [PATCH net 3/4] virtio-net: reset num_buf to 1 after linearizing packet

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Date:   Mon, 21 May 2018 16:35:05 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 3/4] virtio-net: reset num_buf to 1 after linearizing packet

If we successfully linearize the packets, num_buf were set to zero
which was wrong since we now have only 1 buffer to be used for e.g in
the error path of receive_mergeable(). Zero num_buf will lead the code
try to pop the buffers of next packet and drop it. Fixing this by set
num_buf to 1 if we successfully linearize the packet.

Fixes: 4941d472bf95 ("virtio-net: do not reset during XDP set")
Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/virtio_net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6260d65..165a922 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -722,6 +722,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 						      &len);
 			if (!xdp_page)
 				goto err_xdp;
+			num_buf = 1;
 			offset = VIRTIO_XDP_HEADROOM;
 		} else {
 			xdp_page = page;
-- 
2.7.4