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/core/verbs.c

@@ -53,6 +53,9 @@
 
 #include "core_priv.h"
 
+static int ib_resolve_eth_dmac(struct ib_device *device,
+			       struct rdma_ah_attr *ah_attr);
+
 static const char * const ib_events[] = {
 	[IB_EVENT_CQ_ERR]		= "CQ error",
 	[IB_EVENT_QP_FATAL]		= "QP fatal error",
@@ -1257,7 +1260,7 @@ int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
 }
 EXPORT_SYMBOL(ib_modify_qp_is_ok);
 
-int ib_resolve_eth_dmac(struct ib_device *device,
+static int ib_resolve_eth_dmac(struct ib_device *device,
 			       struct rdma_ah_attr *ah_attr)
 {
 	int           ret = 0;
@@ -1317,7 +1320,6 @@ int ib_resolve_eth_dmac(struct ib_device *device,
 out:
 	return ret;
 }
-EXPORT_SYMBOL(ib_resolve_eth_dmac);
 
 /**
  * ib_modify_qp_with_udata - Modifies the attributes for the specified QP.

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -729,14 +729,6 @@ struct ib_ah *bnxt_re_create_ah(struct ib_pd *ib_pd,
 			ah->qplib_ah.nw_type = CMDQ_CREATE_AH_TYPE_V1;
 			break;
 		}
-		rc = rdma_addr_find_l2_eth_by_grh(&sgid, &grh->dgid,
-						  ah_attr->roce.dmac, &vlan_tag,
-						  &sgid_attr.ndev->ifindex,
-						  NULL);
-		if (rc) {
-			dev_err(rdev_to_dev(rdev), "Failed to get dmac\n");
-			goto fail;
-		}
 	}
 
 	memcpy(ah->qplib_ah.dmac, ah_attr->roce.dmac, ETH_ALEN);

drivers/infiniband/hw/hns/hns_roce_ah.c

@@ -48,7 +48,6 @@ struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd,
 	struct ib_gid_attr gid_attr;
 	struct hns_roce_ah *ah;
 	u16 vlan_tag = 0xffff;
-	struct in6_addr in6;
 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 	union ib_gid sgid;
 	int ret;
@@ -58,18 +57,7 @@ struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd,
 		return ERR_PTR(-ENOMEM);
 
 	/* Get mac address */
-	memcpy(&in6, grh->dgid.raw, sizeof(grh->dgid.raw));
-	if (rdma_is_multicast_addr(&in6)) {
-		rdma_get_mcast_mac(&in6, ah->av.mac);
-	} else {
-		u8 *dmac = rdma_ah_retrieve_dmac(ah_attr);
-
-		if (!dmac) {
-			kfree(ah);
-			return ERR_PTR(-EINVAL);
-		}
-		memcpy(ah->av.mac, dmac, ETH_ALEN);
-	}
+	memcpy(ah->av.mac, ah_attr->roce.dmac, ETH_ALEN);
 
 	/* Get source gid */
 	ret = ib_get_cached_gid(ibpd->device, rdma_ah_get_port_num(ah_attr),

drivers/infiniband/hw/mlx4/ah.c

@@ -92,12 +92,10 @@ static struct ib_ah *create_iboe_ah(struct ib_pd *pd,
 	int ret;
 
 	memcpy(&in6, grh->dgid.raw, sizeof(in6));
-	if (rdma_is_multicast_addr(&in6)) {
+	if (rdma_is_multicast_addr(&in6))
 		is_mcast = 1;
-		rdma_get_mcast_mac(&in6, ah->av.eth.mac);
-	} else {
+
 	memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
-	}
 	ret = ib_get_cached_gid(pd->device, rdma_ah_get_port_num(ah_attr),
 				grh->sgid_index, &sgid, &gid_attr);
 	if (ret)

drivers/infiniband/hw/mlx5/ah.c

@@ -89,10 +89,6 @@ struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr,
 
 		resp.response_length = min_resp_len;
 
-		err = ib_resolve_eth_dmac(pd->device, ah_attr);
-		if (err)
-			return ERR_PTR(err);
-
 		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
 		err = ib_copy_to_udata(udata, &resp, resp.response_length);
 		if (err)

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;

include/rdma/ib_verbs.h

@@ -3622,8 +3622,6 @@ void ib_drain_rq(struct ib_qp *qp);
 void ib_drain_sq(struct ib_qp *qp);
 void ib_drain_qp(struct ib_qp *qp);
 
-int ib_resolve_eth_dmac(struct ib_device *device,
-			struct rdma_ah_attr *ah_attr);
 int ib_get_eth_speed(struct ib_device *dev, u8 port_num, u8 *speed, u8 *width);
 
 static inline u8 *rdma_ah_retrieve_dmac(struct rdma_ah_attr *attr)