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- /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
- /*
- * Copyright (c) 2013-2020, Mellanox Technologies inc. All rights reserved.
- */
- #ifndef _MLX5_IB_FS_H
- #define _MLX5_IB_FS_H
- #include "mlx5_ib.h"
- #if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
- int mlx5_ib_fs_init(struct mlx5_ib_dev *dev);
- void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev);
- #else
- static inline int mlx5_ib_fs_init(struct mlx5_ib_dev *dev)
- {
- dev->flow_db = kzalloc(sizeof(*dev->flow_db), GFP_KERNEL);
- if (!dev->flow_db)
- return -ENOMEM;
- mutex_init(&dev->flow_db->lock);
- return 0;
- }
- inline void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev) {}
- #endif
- static inline void mlx5_ib_fs_cleanup(struct mlx5_ib_dev *dev)
- {
- /* When a steering anchor is created, a special flow table is also
- * created for the user to reference. Since the user can reference it,
- * the kernel cannot trust that when the user destroys the steering
- * anchor, they no longer reference the flow table.
- *
- * To address this issue, when a user destroys a steering anchor, only
- * the flow steering rule in the table is destroyed, but the table
- * itself is kept to deal with the above scenario. The remaining
- * resources are only removed when the RDMA device is destroyed, which
- * is a safe assumption that all references are gone.
- */
- mlx5_ib_fs_cleanup_anchor(dev);
- kfree(dev->flow_db);
- }
- #endif /* _MLX5_IB_FS_H */
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