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