From: Parav Pandit <parav@mellanox.com>
Date: Wed, 13 Jun 2018 10:22:07 +0300
Subject: IB/mlx4: Use GID attribute from ah attribute
Patch-mainline: v4.19-rc1
Git-commit: 7492052a186b11be024800eabedef25dcb882613
References: bsc#1103988 FATE#326003

While converting GID index from attribute to that of the HCA, GID
attribute is available from the ah_attr. Make use of GID attribute
to simplify the code and also avoid avoid GID query.

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/mlx4/ah.c      |    4 +---
 drivers/infiniband/hw/mlx4/main.c    |   20 ++++++--------------
 drivers/infiniband/hw/mlx4/mlx4_ib.h |    2 +-
 drivers/infiniband/hw/mlx4/qp.c      |    3 +--
 4 files changed, 9 insertions(+), 20 deletions(-)

--- a/drivers/infiniband/hw/mlx4/ah.c
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -105,9 +105,7 @@ static struct ib_ah *create_iboe_ah(stru
 		vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
 	ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn |
 					 (rdma_ah_get_port_num(ah_attr) << 24));
-	ret = mlx4_ib_gid_index_to_real_index(ibdev,
-					      rdma_ah_get_port_num(ah_attr),
-					      grh->sgid_index);
+	ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr);
 	if (ret < 0)
 		return ERR_PTR(ret);
 	ah->av.eth.gid_index = ret;
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -378,17 +378,15 @@ static int mlx4_ib_del_gid(const struct
 }
 
 int mlx4_ib_gid_index_to_real_index(struct mlx4_ib_dev *ibdev,
-				    u8 port_num, int index)
+				    const struct ib_gid_attr *attr)
 {
 	struct mlx4_ib_iboe *iboe = &ibdev->iboe;
 	struct gid_cache_context *ctx = NULL;
-	union ib_gid gid;
 	struct mlx4_port_gid_table   *port_gid_table;
 	int real_index = -EINVAL;
 	int i;
-	int ret;
 	unsigned long flags;
-	struct ib_gid_attr attr;
+	u8 port_num = attr->port_num;
 
 	if (port_num > MLX4_MAX_PORTS)
 		return -EINVAL;
@@ -397,21 +395,15 @@ int mlx4_ib_gid_index_to_real_index(stru
 		port_num = 1;
 
 	if (!rdma_cap_roce_gid_table(&ibdev->ib_dev, port_num))
-		return index;
-
-	ret = ib_get_cached_gid(&ibdev->ib_dev, port_num, index, &gid, &attr);
-	if (ret)
-		return ret;
-
-	if (attr.ndev)
-		dev_put(attr.ndev);
+		return attr->index;
 
 	spin_lock_irqsave(&iboe->lock, flags);
 	port_gid_table = &iboe->gids[port_num - 1];
 
 	for (i = 0; i < MLX4_MAX_PORT_GIDS; ++i)
-		if (!memcmp(&port_gid_table->gids[i].gid, &gid, sizeof(gid)) &&
-		    attr.gid_type == port_gid_table->gids[i].gid_type) {
+		if (!memcmp(&port_gid_table->gids[i].gid,
+			    &attr->gid, sizeof(attr->gid)) &&
+		    attr->gid_type == port_gid_table->gids[i].gid_type) {
 			ctx = port_gid_table->gids[i].ctx;
 			break;
 		}
--- a/drivers/infiniband/hw/mlx4/mlx4_ib.h
+++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h
@@ -900,7 +900,7 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *
 			  int mr_access_flags, struct ib_pd *pd,
 			  struct ib_udata *udata);
 int mlx4_ib_gid_index_to_real_index(struct mlx4_ib_dev *ibdev,
-				    u8 port_num, int index);
+				    const struct ib_gid_attr *attr);
 
 void mlx4_sched_ib_sl2vl_update_work(struct mlx4_ib_dev *ibdev,
 				     int port);
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1859,8 +1859,7 @@ static int _mlx4_set_path(struct mlx4_ib
 	if (rdma_ah_get_ah_flags(ah) & IB_AH_GRH) {
 		const struct ib_global_route *grh = rdma_ah_read_grh(ah);
 		int real_sgid_index =
-			mlx4_ib_gid_index_to_real_index(dev, port,
-							grh->sgid_index);
+			mlx4_ib_gid_index_to_real_index(dev, grh->sgid_attr);
 
 		if (real_sgid_index < 0)
 			return real_sgid_index;