virtio-net: Support IFF_TX_SKB_NO_LINEAR flag

Virtio net supports the case where the skb linear space is empty, so
add priv_flags.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210218204908.5455-4-alobakin@pm.me

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index ba8e637..f2ff6c3 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2972,7 +2972,8 @@ static int virtnet_probe(struct virtio_device *vdev)
                return -ENOMEM;
 
        /* Set up network device as normal. */
-       dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
+       dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
+                          IFF_TX_SKB_NO_LINEAR;
        dev->netdev_ops = &virtnet_netdev;
        dev->features = NETIF_F_HIGHDMA;