RDMA: Convert drivers to use sgid_attr instead of sgid_index

The core code now ensures that all driver callbacks that receive an
rdma_ah_attrs will have a sgid_attr's pointer if there is a GRH present.

Drivers can use this pointer instead of calling a query function with
sgid_index. This simplifies the drivers and also avoids races where a
gid_index lookup may return different data if it is changed.

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/mlx5/main.c

@@ -524,41 +524,15 @@ static int mlx5_ib_del_gid(const struct ib_gid_attr *attr,
 			     attr->index, NULL, NULL);
 }
 
-__be16 mlx5_get_roce_udp_sport(struct mlx5_ib_dev *dev, u8 port_num,
-			       int index)
+__be16 mlx5_get_roce_udp_sport(struct mlx5_ib_dev *dev,
+			       const struct ib_gid_attr *attr)
 {
-	struct ib_gid_attr attr;
-	union ib_gid gid;
-
-	if (ib_get_cached_gid(&dev->ib_dev, port_num, index, &gid, &attr))
-		return 0;
-
-	dev_put(attr.ndev);
-
-	if (attr.gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
+	if (attr->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
 		return 0;
 
 	return cpu_to_be16(MLX5_CAP_ROCE(dev->mdev, r_roce_min_src_udp_port));
 }
 
-int mlx5_get_roce_gid_type(struct mlx5_ib_dev *dev, u8 port_num,
-			   int index, enum ib_gid_type *gid_type)
-{
-	struct ib_gid_attr attr;
-	union ib_gid gid;
-	int ret;
-
-	ret = ib_get_cached_gid(&dev->ib_dev, port_num, index, &gid, &attr);
-	if (ret)
-		return ret;
-
-	dev_put(attr.ndev);
-
-	*gid_type = attr.gid_type;
-
-	return 0;
-}
-
 static int mlx5_use_mad_ifc(struct mlx5_ib_dev *dev)
 {
 	if (MLX5_CAP_GEN(dev->mdev, port_type) == MLX5_CAP_PORT_TYPE_IB)