RDMA/mlx5: Rely on existence of udata to separate kernel/user flows

Instead of keeping special field to separate kernel/user create/destroy
flows, rely on existence of udata pointer. All allocation flows are
using kzalloc() and leave uninitialized pointers as NULL which makes
MLX5_QP_EMPTY and MLX5_QP_KERNEL flows to be the same.

Link: https://lore.kernel.org/r/20200427154636.381474-25-leon@kernel.org
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -337,7 +337,6 @@ struct mlx5_ib_rwq {
 	struct ib_umem		*umem;
 	size_t			buf_size;
 	unsigned int		page_shift;
-	int			create_type;
 	struct mlx5_db		db;
 	u32			user_index;
 	u32			wqe_count;
@@ -346,17 +345,6 @@ struct mlx5_ib_rwq {
 	u32			create_flags; /* Use enum mlx5_ib_wq_flags */
 };
 
-enum {
-	MLX5_QP_USER,
-	MLX5_QP_KERNEL,
-	MLX5_QP_EMPTY
-};
-
-enum {
-	MLX5_WQ_USER,
-	MLX5_WQ_KERNEL
-};
-
 struct mlx5_ib_rwq_ind_table {
 	struct ib_rwq_ind_table ib_rwq_ind_tbl;
 	u32			rqtn;
@@ -457,8 +445,6 @@ struct mlx5_ib_qp {
 	 */
 	int			bfregn;
 
-	int			create_type;
-
 	struct list_head	qps_list;
 	struct list_head	cq_recv_list;
 	struct list_head	cq_send_list;