net/mlx5: Provide simplified command interfaces

Many mlx5_cmd_exec() callers are not interested in the output from that
command or have standard in/out structures. Those callers simply allocate
those structure on the stack and use sizeof() to provide in/out arguments.

In this naive approach provide simplified versions of mlx5_cmd_exec().
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

include/linux/mlx5/driver.h

@@ -903,6 +903,19 @@ int mlx5_cmd_exec_cb(struct mlx5_async_ctx *ctx, void *in, int in_size,
 
 int mlx5_cmd_exec(struct mlx5_core_dev *dev, void *in, int in_size, void *out,
 		  int out_size);
+
+#define mlx5_cmd_exec_inout(dev, ifc_cmd, in, out)                             \
+	({                                                                     \
+		mlx5_cmd_exec(dev, in, MLX5_ST_SZ_BYTES(ifc_cmd##_in), out,    \
+			      MLX5_ST_SZ_BYTES(ifc_cmd##_out));                \
+	})
+
+#define mlx5_cmd_exec_in(dev, ifc_cmd, in)                                     \
+	({                                                                     \
+		u32 _out[MLX5_ST_SZ_DW(ifc_cmd##_out)] = {};                   \
+		mlx5_cmd_exec_inout(dev, ifc_cmd, in, _out);                   \
+	})
+
 int mlx5_cmd_exec_polling(struct mlx5_core_dev *dev, void *in, int in_size,
 			  void *out, int out_size);
 void mlx5_cmd_mbox_status(void *out, u8 *status, u32 *syndrome);