text: /*
   * Copyright (c) 2017, Mellanox Technologies. All rights reserved.
   *
   * This software is available to you under a choice of one of two
   * licenses.  You may choose to be licensed under the terms of the GNU
   * General Public License (GPL) Version 2, available from the file
   * COPYING in the main directory of this source tree, or the
   * OpenIB.org BSD license below:
   *
   *     Redistribution and use in source and binary forms, with or
   *     without modification, are permitted provided that the following
   *     conditions are met:
   *
   *      - Redistributions of source code must retain the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer.
   *
   *      - Redistributions in binary form must reproduce the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer in the documentation and/or other materials
   *        provided with the distribution.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  #include "cmd.h"
  
  int mlx5_cmd_null_mkey(struct mlx5_core_dev *dev, u32 *null_mkey)
  {
  	u32 out[MLX5_ST_SZ_DW(query_special_contexts_out)] = {};
  	u32 in[MLX5_ST_SZ_DW(query_special_contexts_in)]   = {};
  	int err;
  
  	MLX5_SET(query_special_contexts_in, in, opcode,
  		 MLX5_CMD_OP_QUERY_SPECIAL_CONTEXTS);
  	err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  	if (!err)
  		*null_mkey = MLX5_GET(query_special_contexts_out, out,
  				      null_mkey);
  	return err;
  }
  