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