1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
2/*
3 * Copyright (c) 2013-2020, Mellanox Technologies inc. All rights reserved.
4 */
5
6#ifndef _MLX5_IB_FS_H
7#define _MLX5_IB_FS_H
8
9#include "mlx5_ib.h"
10
11#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
12int mlx5_ib_fs_init(struct mlx5_ib_dev *dev);
13void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev);
14#else
15static inline int mlx5_ib_fs_init(struct mlx5_ib_dev *dev)
16{
17	dev->flow_db = kzalloc(sizeof(*dev->flow_db), GFP_KERNEL);
18
19	if (!dev->flow_db)
20		return -ENOMEM;
21
22	mutex_init(&dev->flow_db->lock);
23	return 0;
24}
25
26inline void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev) {}
27#endif
28
29static inline void mlx5_ib_fs_cleanup(struct mlx5_ib_dev *dev)
30{
31	/* When a steering anchor is created, a special flow table is also
32	 * created for the user to reference. Since the user can reference it,
33	 * the kernel cannot trust that when the user destroys the steering
34	 * anchor, they no longer reference the flow table.
35	 *
36	 * To address this issue, when a user destroys a steering anchor, only
37	 * the flow steering rule in the table is destroyed, but the table
38	 * itself is kept to deal with the above scenario. The remaining
39	 * resources are only removed when the RDMA device is destroyed, which
40	 * is a safe assumption that all references are gone.
41	 */
42	mlx5_ib_fs_cleanup_anchor(dev);
43	kfree(dev->flow_db);
44}
45#endif /* _MLX5_IB_FS_H */
46