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) 12 int mlx5_ib_fs_init(struct mlx5_ib_dev *dev); 13 void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev); 14 #else 15 static 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 26 inline void mlx5_ib_fs_cleanup_anchor(struct mlx5_ib_dev *dev) {} 27 #endif 28 29 static 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