openvswitch: allow L3 netdev ports

Allow ARPHRD_NONE interfaces to be added to ovs bridge.

Based on previous versions by Lorand Jakab and Simon Horman.
Signed-off-by: NLorand Jakab <lojakab@cisco.com>
Signed-off-by: NSimon Horman <simon.horman@netronome.com>
Signed-off-by: NJiri Benc <jbenc@redhat.com>
Acked-by: NPravin B Shelar <pshelar@ovn.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/openvswitch/vport-netdev.c

@@ -57,8 +57,10 @@ static void netdev_port_receive(struct sk_buff *skb)
 	if (unlikely(!skb))
 		return;
 
-	skb_push(skb, ETH_HLEN);
-	skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
+	if (skb->dev->type == ARPHRD_ETHER) {
+		skb_push(skb, ETH_HLEN);
+		skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
+	}
 	ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
 	return;
 error:
@@ -97,7 +99,8 @@ struct vport *ovs_netdev_link(struct vport *vport, const char *name)
 	}
 
 	if (vport->dev->flags & IFF_LOOPBACK ||
-	    vport->dev->type != ARPHRD_ETHER ||
+	    (vport->dev->type != ARPHRD_ETHER &&
+	     vport->dev->type != ARPHRD_NONE) ||
 	    ovs_is_internal_dev(vport->dev)) {
 		err = -EINVAL;
 		goto error_put;