virtio_net: Fix IP alignment on non-mergeable RX path

We need to enforce the IP alignment on the non-mergeable RX path just
like the other RX path.  Not doing so results in misaligned IP
headers.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 09bd4410fa651d665ea6163fb2ca51e83c21b41c..f0bb1a4c83238c59243232b15928edaab66f2203 100644 (file)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -283,10 +283,11 @@ static void try_fill_recv_maxbufs(struct virtnet_info *vi)
        for (;;) {
                struct virtio_net_hdr *hdr;
 
-               skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN);
+               skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN + NET_IP_ALIGN);
                if (unlikely(!skb))
                        break;
 
+               skb_reserve(skb, NET_IP_ALIGN);
                skb_put(skb, MAX_PACKET_LEN);
 
                hdr = skb_vnet_hdr(skb);