From: Parav Pandit <parav@mellanox.com>
Date: Wed, 13 Jun 2018 10:22:09 +0300
Subject: RDMA: Convert drivers to use the AH's sgid_attr in post_wr paths
Patch-mainline: v4.19-rc1
Git-commit: 89af969a665390dc6b156fef55755ca546cd8d92
References: bsc#1103992 FATE#326009

For UD the drivers were doing a sgid_index lookup into the cache to get
the attrs, however we can now directly access the same attrs stores in
the ib_ah instead and remove the lookup.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c  |   33 +++++++++---------------------
 drivers/infiniband/hw/mlx4/qp.c           |    8 +------
 drivers/infiniband/hw/mthca/mthca_av.c    |    5 ----
 drivers/infiniband/hw/qedr/qedr_roce_cm.c |   25 +++++-----------------
 4 files changed, 19 insertions(+), 52 deletions(-)

--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -1879,15 +1879,13 @@ static int bnxt_re_build_qp1_send_v2(str
 				     struct bnxt_qplib_swqe *wqe,
 				     int payload_size)
 {
-	struct ib_device *ibdev = &qp->rdev->ibdev;
 	struct bnxt_re_ah *ah = container_of(ud_wr(wr)->ah, struct bnxt_re_ah,
 					     ib_ah);
 	struct bnxt_qplib_ah *qplib_ah = &ah->qplib_ah;
+	const struct ib_gid_attr *sgid_attr = ah->ib_ah.sgid_attr;
 	struct bnxt_qplib_sge sge;
-	union ib_gid sgid;
 	u8 nw_type;
 	u16 ether_type;
-	struct ib_gid_attr sgid_attr;
 	union ib_gid dgid;
 	bool is_eth = false;
 	bool is_vlan = false;
@@ -1900,22 +1898,10 @@ static int bnxt_re_build_qp1_send_v2(str
 
 	memset(&qp->qp1_hdr, 0, sizeof(qp->qp1_hdr));
 
-	rc = ib_get_cached_gid(ibdev, 1,
-			       qplib_ah->host_sgid_index, &sgid,
-			       &sgid_attr);
-	if (rc) {
-		dev_err(rdev_to_dev(qp->rdev),
-			"Failed to query gid at index %d",
-			qplib_ah->host_sgid_index);
-		return rc;
-	}
-	if (sgid_attr.ndev) {
-		if (is_vlan_dev(sgid_attr.ndev))
-			vlan_id = vlan_dev_vlan_id(sgid_attr.ndev);
-		dev_put(sgid_attr.ndev);
-	}
+	if (is_vlan_dev(sgid_attr->ndev))
+		vlan_id = vlan_dev_vlan_id(sgid_attr->ndev);
 	/* Get network header type for this GID */
-	nw_type = rdma_gid_attr_network_type(&sgid_attr);
+	nw_type = rdma_gid_attr_network_type(sgid_attr);
 	switch (nw_type) {
 	case RDMA_NETWORK_IPV4:
 		nw_type = BNXT_RE_ROCEV2_IPV4_PACKET;
@@ -1928,9 +1914,9 @@ static int bnxt_re_build_qp1_send_v2(str
 		break;
 	}
 	memcpy(&dgid.raw, &qplib_ah->dgid, 16);
-	is_udp = sgid_attr.gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP;
+	is_udp = sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP;
 	if (is_udp) {
-		if (ipv6_addr_v4mapped((struct in6_addr *)&sgid)) {
+		if (ipv6_addr_v4mapped((struct in6_addr *)&sgid_attr->gid)) {
 			ip_version = 4;
 			ether_type = ETH_P_IP;
 		} else {
@@ -1963,9 +1949,10 @@ static int bnxt_re_build_qp1_send_v2(str
 	}
 
 	if (is_grh || (ip_version == 6)) {
-		memcpy(qp->qp1_hdr.grh.source_gid.raw, sgid.raw, sizeof(sgid));
+		memcpy(qp->qp1_hdr.grh.source_gid.raw, sgid_attr->gid.raw,
+		       sizeof(sgid_attr->gid));
 		memcpy(qp->qp1_hdr.grh.destination_gid.raw, qplib_ah->dgid.data,
-		       sizeof(sgid));
+		       sizeof(sgid_attr->gid));
 		qp->qp1_hdr.grh.hop_limit     = qplib_ah->hop_limit;
 	}
 
@@ -1975,7 +1962,7 @@ static int bnxt_re_build_qp1_send_v2(str
 		qp->qp1_hdr.ip4.frag_off = htons(IP_DF);
 		qp->qp1_hdr.ip4.ttl = qplib_ah->hop_limit;
 
-		memcpy(&qp->qp1_hdr.ip4.saddr, sgid.raw + 12, 4);
+		memcpy(&qp->qp1_hdr.ip4.saddr, sgid_attr->gid.raw + 12, 4);
 		memcpy(&qp->qp1_hdr.ip4.daddr, qplib_ah->dgid.data + 12, 4);
 		qp->qp1_hdr.ip4.check = ib_ud_ip4_csum(&qp->qp1_hdr);
 	}
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -3169,12 +3169,8 @@ static int build_mlx_header(struct mlx4_
 					to_mdev(ib_dev)->sriov.demux[sqp->qp.port - 1].
 						       guid_cache[ah->av.ib.gid_index];
 			} else {
-				err = rdma_query_gid(ib_dev,
-					be32_to_cpu(ah->av.ib.port_pd) >> 24,
-					ah->av.ib.gid_index,
-					&sqp->ud_header.grh.source_gid);
-				if (err)
-					return err;
+				sqp->ud_header.grh.source_gid =
+					ah->ibah.sgid_attr->gid;
 			}
 		}
 		memcpy(sqp->ud_header.grh.destination_gid.raw,
--- a/drivers/infiniband/hw/mthca/mthca_av.c
+++ b/drivers/infiniband/hw/mthca/mthca_av.c
@@ -281,10 +281,7 @@ int mthca_read_ah(struct mthca_dev *dev,
 		header->grh.flow_label    =
 			ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
 		header->grh.hop_limit     = ah->av->hop_limit;
-		ib_get_cached_gid(&dev->ib_dev,
-				  be32_to_cpu(ah->av->port_pd) >> 24,
-				  ah->av->gid_index % dev->limits.gid_table_len,
-				  &header->grh.source_gid, NULL);
+		header->grh.source_gid = ah->ibah.sgid_attr->gid;
 		memcpy(header->grh.destination_gid.raw,
 		       ah->av->dgid, 16);
 	}
--- a/drivers/infiniband/hw/qedr/qedr_roce_cm.c
+++ b/drivers/infiniband/hw/qedr/qedr_roce_cm.c
@@ -387,11 +387,10 @@ static inline int qedr_gsi_build_header(
 	bool has_vlan = false, has_grh_ipv6 = true;
 	struct rdma_ah_attr *ah_attr = &get_qedr_ah(ud_wr(swr)->ah)->attr;
 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
-	union ib_gid sgid;
+	const struct ib_gid_attr *sgid_attr = grh->sgid_attr;
 	int send_size = 0;
 	u16 vlan_id = 0;
 	u16 ether_type;
-	struct ib_gid_attr sgid_attr;
 	int rc;
 	int ip_ver = 0;
 
@@ -402,28 +401,16 @@ static inline int qedr_gsi_build_header(
 	for (i = 0; i < swr->num_sge; ++i)
 		send_size += swr->sg_list[i].length;
 
-	rc = ib_get_cached_gid(qp->ibqp.device, rdma_ah_get_port_num(ah_attr),
-			       grh->sgid_index, &sgid, &sgid_attr);
-	if (rc) {
-		DP_ERR(dev,
-		       "gsi post send: failed to get cached GID (port=%d, ix=%d)\n",
-		       rdma_ah_get_port_num(ah_attr),
-		       grh->sgid_index);
-		return rc;
-	}
-
-	vlan_id = rdma_vlan_dev_vlan_id(sgid_attr.ndev);
+	vlan_id = rdma_vlan_dev_vlan_id(sgid_attr->ndev);
 	if (vlan_id < VLAN_CFI_MASK)
 		has_vlan = true;
 
-	dev_put(sgid_attr.ndev);
-
-	has_udp = (sgid_attr.gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP);
+	has_udp = (sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP);
 	if (!has_udp) {
 		/* RoCE v1 */
 		ether_type = ETH_P_IBOE;
 		*roce_mode = ROCE_V1;
-	} else if (ipv6_addr_v4mapped((struct in6_addr *)&sgid)) {
+	} else if (ipv6_addr_v4mapped((struct in6_addr *)&sgid_attr->gid)) {
 		/* RoCE v2 IPv4 */
 		ip_ver = 4;
 		ether_type = ETH_P_IP;
@@ -471,7 +458,7 @@ static inline int qedr_gsi_build_header(
 		udh->grh.flow_label = grh->flow_label;
 		udh->grh.hop_limit = grh->hop_limit;
 		udh->grh.destination_gid = grh->dgid;
-		memcpy(&udh->grh.source_gid.raw, &sgid.raw,
+		memcpy(&udh->grh.source_gid.raw, sgid_attr->gid.raw,
 		       sizeof(udh->grh.source_gid.raw));
 	} else {
 		/* IPv4 header */
@@ -482,7 +469,7 @@ static inline int qedr_gsi_build_header(
 		udh->ip4.frag_off = htons(IP_DF);
 		udh->ip4.ttl = grh->hop_limit;
 
-		ipv4_addr = qedr_get_ipv4_from_gid(sgid.raw);
+		ipv4_addr = qedr_get_ipv4_from_gid(sgid_attr->gid.raw);
 		udh->ip4.saddr = ipv4_addr;
 		ipv4_addr = qedr_get_ipv4_from_gid(grh->dgid.raw);
 		udh->ip4.daddr = ipv4_addr;