openvswitch: Retrieve tunnel metadata when receiving from vport-netdev

Retrieve the tunnel metadata for packets received by a net_device and
provide it to ovs_vport_receive() for flow key extraction.

[This hunk was in the GRE patch in the initial series and missed the
 cut for the initial submission for merging.]

Fixes: 614732eaa12d ("openvswitch: Use regular VXLAN net_device device")
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/openvswitch/vport-netdev.c

@@ -58,7 +58,7 @@ static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
 	skb_push(skb, ETH_HLEN);
 	ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
 
-	ovs_vport_receive(vport, skb, NULL);
+	ovs_vport_receive(vport, skb, skb_tunnel_info(skb, AF_INET));
 	return;
 
 error: