IB: Let ib_core resolve destination mac address

Since IB/core resolves the destination mac address for user and kernel
consumers, avoid resolving in multiple provider drivers.

Only ib_core resolves DMAC now, therefore resolve_eth_dmac is removed as
exported symbol.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/ocrdma/ocrdma_ah.c

@@ -201,21 +201,6 @@ struct ib_ah *ocrdma_create_ah(struct ib_pd *ibpd, struct rdma_ah_attr *attr,
 	/* Get network header type for this GID */
 	ah->hdr_type = ib_gid_to_network_type(sgid_attr.gid_type, &sgid);
 
-	if ((pd->uctx) &&
-	    (!rdma_is_multicast_addr((struct in6_addr *)grh->dgid.raw)) &&
-	    (!rdma_link_local_addr((struct in6_addr *)grh->dgid.raw))) {
-		status = rdma_addr_find_l2_eth_by_grh(&sgid, &grh->dgid,
-						      attr->roce.dmac,
-						      &vlan_tag,
-						      &sgid_attr.ndev->ifindex,
-						      NULL);
-		if (status) {
-			pr_err("%s(): Failed to resolve dmac from gid." 
-				"status = %d\n", __func__, status);
-			goto av_conf_err;
-		}
-	}
-
 	status = set_av_attr(dev, ah, attr, &sgid, pd->id, &isvlan, vlan_tag);
 	if (status)
 		goto av_conf_err;