1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
3 * Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
6 #ifndef _RDMA_RESTRACK_H_
7 #define _RDMA_RESTRACK_H_
9 #include <linux/typecheck.h>
10 #include <linux/rwsem.h>
11 #include <linux/sched.h>
12 #include <linux/kref.h>
13 #include <linux/completion.h>
14 #include <linux/sched/task.h>
15 #include <uapi/rdma/rdma_netlink.h>
18 * enum rdma_restrack_type - HW objects to track
20 enum rdma_restrack_type {
22 * @RDMA_RESTRACK_PD: Protection domain (PD)
26 * @RDMA_RESTRACK_CQ: Completion queue (CQ)
30 * @RDMA_RESTRACK_QP: Queue pair (QP)
34 * @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
38 * @RDMA_RESTRACK_MR: Memory Region (MR)
42 * @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
46 * @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
51 #define RDMA_RESTRACK_HASH_BITS 8
52 struct rdma_restrack_entry;
55 * struct rdma_restrack_root - main resource tracking management
58 struct rdma_restrack_root {
60 * @rwsem: Read/write lock to protect lists
62 struct rw_semaphore rwsem;
64 * @hash: global database for all resources per-device
66 DECLARE_HASHTABLE(hash, RDMA_RESTRACK_HASH_BITS);
68 * @fill_res_entry: driver-specific fill function
70 * Allows rdma drivers to add their own restrack attributes.
72 int (*fill_res_entry)(struct sk_buff *msg,
73 struct rdma_restrack_entry *entry);
77 * struct rdma_restrack_entry - metadata per-entry
79 struct rdma_restrack_entry {
81 * @valid: validity indicator
83 * The entries are filled during rdma_restrack_add,
84 * can be attempted to be free during rdma_restrack_del.
86 * As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
90 * @kref: Protect destroy of the resource
94 * @comp: Signal that all consumers of resource are completed their work
96 struct completion comp;
98 * @task: owner of resource tracking entity
100 * There are two types of entities: created by user and created
103 * This is relevant for the entities created by users.
104 * For the entities created by kernel, this pointer will be NULL.
106 struct task_struct *task;
108 * @kern_name: name of owner for the kernel created entities.
110 const char *kern_name;
112 * @node: hash table entry
114 struct hlist_node node;
116 * @type: various objects in restrack database
118 enum rdma_restrack_type type;
122 * rdma_restrack_init() - initialize resource tracking
123 * @res: resource tracking root
125 void rdma_restrack_init(struct rdma_restrack_root *res);
128 * rdma_restrack_clean() - clean resource tracking
129 * @res: resource tracking root
131 void rdma_restrack_clean(struct rdma_restrack_root *res);
134 * rdma_restrack_count() - the current usage of specific object
135 * @res: resource entry
136 * @type: actual type of object to operate
139 int rdma_restrack_count(struct rdma_restrack_root *res,
140 enum rdma_restrack_type type,
141 struct pid_namespace *ns);
144 * rdma_restrack_add() - add object to the reource tracking database
145 * @res: resource entry
147 void rdma_restrack_add(struct rdma_restrack_entry *res);
150 * rdma_restrack_del() - delete object from the reource tracking database
151 * @res: resource entry
152 * @type: actual type of object to operate
154 void rdma_restrack_del(struct rdma_restrack_entry *res);
157 * rdma_is_kernel_res() - check the owner of resource
158 * @res: resource entry
160 static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
166 * rdma_restrack_get() - grab to protect resource from release
167 * @res: resource entry
169 int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
172 * rdma_restrack_put() - release resource
173 * @res: resource entry
175 int rdma_restrack_put(struct rdma_restrack_entry *res);
178 * rdma_restrack_set_task() - set the task for this resource
179 * @res: resource entry
180 * @caller: kernel name, the current task will be used if the caller is NULL.
182 void rdma_restrack_set_task(struct rdma_restrack_entry *res,
186 * Helper functions for rdma drivers when filling out
187 * nldev driver attributes.
189 int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
190 int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
192 int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
193 int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
195 #endif /* _RDMA_RESTRACK_H_ */