IB/mlx4: Use GID attribute from ah attribute

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>

drivers/infiniband/hw/mlx4/ah.c

@@ -105,9 +105,7 @@ static struct ib_ah *create_iboe_ah(struct ib_pd *pd,
 		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;

drivers/infiniband/hw/mlx4/main.c

@@ -380,17 +380,15 @@ static int mlx4_ib_del_gid(const struct ib_gid_attr *attr, void **context)
 }
 
 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;
@@ -399,21 +397,15 @@ int mlx4_ib_gid_index_to_real_index(struct mlx4_ib_dev *ibdev,
 		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;
 		}

drivers/infiniband/hw/mlx4/mlx4_ib.h

@@ -900,7 +900,7 @@ int mlx4_ib_rereg_user_mr(struct ib_mr *mr, int flags,
 			  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);

drivers/infiniband/hw/mlx4/qp.c

@@ -1859,8 +1859,7 @@ static int _mlx4_set_path(struct mlx4_ib_dev *dev,
 	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;