virtio_net: add checking sq is full inside xdp xmit

If the queue of xdp xmit is not an independent queue, then when the xdp
xmit used all the desc, the xmit from the __dev_queue_xmit() may encounter
the following error.

net ens4: Unexpected TXQ (0) queue failure: -28

This patch adds a check whether sq is full in xdp xmit.

Fixes: 56434a01b12e ("virtio_net: add XDP_TX support")
Reported-by: Yichun Zhang <yichun@openresty.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 46bbddaadb0d31c33e7c707170e25b02e1d840f0..1a309cfb4976aa4501b743749b528fd35d5e10cf 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -767,6 +767,9 @@ static int virtnet_xdp_xmit(struct net_device *dev,
        }
        ret = nxmit;
 
+       if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
+               check_sq_full_and_disable(vi, dev, sq);
+
        if (flags & XDP_XMIT_FLUSH) {
                if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
                        kicks = 1;