RDMA/rxe: Consider skb reserve space based on netdev of GID

Always consider the skb reserve space based on netdevice of the GID
attribute, regardless of vlan or non vlan netdevice.

Fixes: 43c9fc50 ("rdma_rxe: make rxe work over 802.1q VLAN devices")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rxe/rxe_net.c

@@ -481,8 +481,9 @@ struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av,
 	if (unlikely(!skb))
 		goto out;
 
-	skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev));
+	skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev));
 
+	/* FIXME: hold reference to this netdev until life of this skb. */
 	skb->dev	= ndev;
 	if (av->network_type == RDMA_NETWORK_IPV4)
 		skb->protocol = htons(ETH_P_IP);