RDMA/bnxt_re: Use rdma_read_gid_hw_context to retrieve HW gid index

bnxt_re HW maintains a GID table with only a single entry for the two
duplicate GID entries (v1 and v2). Driver needs to map stack gid index to
the HW table gid index.  Use the new API rdma_read_gid_hw_context () to
retrieve the HW GID context to get the HW table index.

Link: https://lore.kernel.org/r/1582107594-5180-3-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -639,6 +639,7 @@ int bnxt_re_create_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr,
 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
 	struct bnxt_re_dev *rdev = pd->rdev;
 	const struct ib_gid_attr *sgid_attr;
+	struct bnxt_re_gid_ctx *ctx;
 	struct bnxt_re_ah *ah = container_of(ib_ah, struct bnxt_re_ah, ib_ah);
 	u8 nw_type;
 	int rc;
@@ -654,19 +655,18 @@ int bnxt_re_create_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr,
 	/* Supply the configuration for the HW */
 	memcpy(ah->qplib_ah.dgid.data, grh->dgid.raw,
 	       sizeof(union ib_gid));
-	/*
-	 * If RoCE V2 is enabled, stack will have two entries for
-	 * each GID entry. Avoiding this duplicte entry in HW. Dividing
-	 * the GID index by 2 for RoCE V2
+	sgid_attr = grh->sgid_attr;
+	/* Get the HW context of the GID. The reference
+	 * of GID table entry is already taken by the caller.
 	 */
-	ah->qplib_ah.sgid_index = grh->sgid_index / 2;
+	ctx = rdma_read_gid_hw_context(sgid_attr);
+	ah->qplib_ah.sgid_index = ctx->idx;
 	ah->qplib_ah.host_sgid_index = grh->sgid_index;
 	ah->qplib_ah.traffic_class = grh->traffic_class;
 	ah->qplib_ah.flow_label = grh->flow_label;
 	ah->qplib_ah.hop_limit = grh->hop_limit;
 	ah->qplib_ah.sl = rdma_ah_get_sl(ah_attr);
 
-	sgid_attr = grh->sgid_attr;
 	/* Get network header type for this GID */
 	nw_type = rdma_gid_attr_network_type(sgid_attr);
 	ah->qplib_ah.nw_type = bnxt_re_stack_to_dev_nw_type(nw_type);
@@ -1593,6 +1593,7 @@ int bnxt_re_modify_qp(struct ib_qp *ib_qp, struct ib_qp_attr *qp_attr,
 		const struct ib_global_route *grh =
 			rdma_ah_read_grh(&qp_attr->ah_attr);
 		const struct ib_gid_attr *sgid_attr;
+		struct bnxt_re_gid_ctx *ctx;
 
 		qp->qplib_qp.modify_flags |= CMDQ_MODIFY_QP_MODIFY_MASK_DGID |
 				     CMDQ_MODIFY_QP_MODIFY_MASK_FLOW_LABEL |
@@ -1604,19 +1605,19 @@ int bnxt_re_modify_qp(struct ib_qp *ib_qp, struct ib_qp_attr *qp_attr,
 		memcpy(qp->qplib_qp.ah.dgid.data, grh->dgid.raw,
 		       sizeof(qp->qplib_qp.ah.dgid.data));
 		qp->qplib_qp.ah.flow_label = grh->flow_label;
-		/* If RoCE V2 is enabled, stack will have two entries for
-		 * each GID entry. Avoiding this duplicte entry in HW. Dividing
-		 * the GID index by 2 for RoCE V2
+		sgid_attr = grh->sgid_attr;
+		/* Get the HW context of the GID. The reference
+		 * of GID table entry is already taken by the caller.
 		 */
-		qp->qplib_qp.ah.sgid_index = grh->sgid_index / 2;
+		ctx = rdma_read_gid_hw_context(sgid_attr);
+		qp->qplib_qp.ah.sgid_index = ctx->idx;
 		qp->qplib_qp.ah.host_sgid_index = grh->sgid_index;
 		qp->qplib_qp.ah.hop_limit = grh->hop_limit;
 		qp->qplib_qp.ah.traffic_class = grh->traffic_class;
 		qp->qplib_qp.ah.sl = rdma_ah_get_sl(&qp_attr->ah_attr);
 		ether_addr_copy(qp->qplib_qp.ah.dmac,
 				qp_attr->ah_attr.roce.dmac);
 
-		sgid_attr = qp_attr->ah_attr.grh.sgid_attr;
 		rc = rdma_read_gid_l2_fields(sgid_attr, NULL,
 					     &qp->qplib_qp.smac[0]);
 		if (rc)