include/rdma/restrack.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
   2 /*
   3  * Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
   4  */
   5
   6 #ifndef _RDMA_RESTRACK_H_
   7 #define _RDMA_RESTRACK_H_
   8
   9 #include <linux/typecheck.h>
  10 #include <linux/sched.h>
  11 #include <linux/kref.h>
  12 #include <linux/completion.h>
  13 #include <linux/sched/task.h>
  14 #include <uapi/rdma/rdma_netlink.h>
  15 #include <linux/xarray.h>
  16
  17 struct ib_device;
  18 struct sk_buff;
  19
  20 /**
  21  * enum rdma_restrack_type - HW objects to track
  22  */
  23 enum rdma_restrack_type {
  24         /**
  25          * @RDMA_RESTRACK_PD: Protection domain (PD)
  26          */
  27         RDMA_RESTRACK_PD,
  28         /**
  29          * @RDMA_RESTRACK_CQ: Completion queue (CQ)
  30          */
  31         RDMA_RESTRACK_CQ,
  32         /**
  33          * @RDMA_RESTRACK_QP: Queue pair (QP)
  34          */
  35         RDMA_RESTRACK_QP,
  36         /**
  37          * @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
  38          */
  39         RDMA_RESTRACK_CM_ID,
  40         /**
  41          * @RDMA_RESTRACK_MR: Memory Region (MR)
  42          */
  43         RDMA_RESTRACK_MR,
  44         /**
  45          * @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
  46          */
  47         RDMA_RESTRACK_CTX,
  48         /**
  49          * @RDMA_RESTRACK_COUNTER: Statistic Counter
  50          */
  51         RDMA_RESTRACK_COUNTER,
  52         /**
  53          * @RDMA_RESTRACK_SRQ: Shared receive queue (SRQ)
  54          */
  55         RDMA_RESTRACK_SRQ,
  56         /**
  57          * @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
  58          */
  59         RDMA_RESTRACK_MAX
  60 };
  61
  62 /**
  63  * struct rdma_restrack_entry - metadata per-entry
  64  */
  65 struct rdma_restrack_entry {
  66         /**
  67          * @valid: validity indicator
  68          *
  69          * The entries are filled during rdma_restrack_add,
  70          * can be attempted to be free during rdma_restrack_del.
  71          *
  72          * As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
  73          */
  74         bool                    valid;
  75         /**
  76          * @no_track: don't add this entry to restrack DB
  77          *
  78          * This field is used to mark an entry that doesn't need to be added to
  79          * internal restrack DB and presented later to the users at the nldev
  80          * query stage.
  81          */
  82         u8                      no_track : 1;
  83         /*
  84          * @kref: Protect destroy of the resource
  85          */
  86         struct kref             kref;
  87         /*
  88          * @comp: Signal that all consumers of resource are completed their work
  89          */
  90         struct completion       comp;
  91         /**
  92          * @task: owner of resource tracking entity
  93          *
  94          * There are two types of entities: created by user and created
  95          * by kernel.
  96          *
  97          * This is relevant for the entities created by users.
  98          * For the entities created by kernel, this pointer will be NULL.
  99          */
 100         struct task_struct      *task;
 101         /**
 102          * @kern_name: name of owner for the kernel created entities.
 103          */
 104         const char              *kern_name;
 105         /**
 106          * @type: various objects in restrack database
 107          */
 108         enum rdma_restrack_type type;
 109         /**
 110          * @user: user resource
 111          */
 112         bool                    user;
 113         /**
 114          * @id: ID to expose to users
 115          */
 116         u32 id;
 117 };
 118
 119 int rdma_restrack_count(struct ib_device *dev,
 120                         enum rdma_restrack_type type);
 121 /**
 122  * rdma_is_kernel_res() - check the owner of resource
 123  * @res:  resource entry
 124  */
 125 static inline bool rdma_is_kernel_res(const struct rdma_restrack_entry *res)
 126 {
 127         return !res->user;
 128 }
 129
 130 /**
 131  * rdma_restrack_get() - grab to protect resource from release
 132  * @res:  resource entry
 133  */
 134 int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
 135
 136 /**
 137  * rdma_restrack_put() - release resource
 138  * @res:  resource entry
 139  */
 140 int rdma_restrack_put(struct rdma_restrack_entry *res);
 141
 142 /*
 143  * Helper functions for rdma drivers when filling out
 144  * nldev driver attributes.
 145  */
 146 int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
 147 int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
 148                                u32 value);
 149 int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
 150 int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
 151                                u64 value);
 152 int rdma_nl_put_driver_string(struct sk_buff *msg, const char *name,
 153                               const char *str);
 154 int rdma_nl_stat_hwcounter_entry(struct sk_buff *msg, const char *name,
 155                                  u64 value);
 156
 157 struct rdma_restrack_entry *rdma_restrack_get_byid(struct ib_device *dev,
 158                                                    enum rdma_restrack_type type,
 159                                                    u32 id);
 160
 161 /**
 162  * rdma_restrack_no_track() - don't add resource to the DB
 163  * @res: resource entry
 164  *
 165  * Every user of thie API should be cross examined.
 166  * Probaby you don't need to use this function.
 167  */
 168 static inline void rdma_restrack_no_track(struct rdma_restrack_entry *res)
 169 {
 170         res->no_track = true;
 171 }
 172 static inline bool rdma_restrack_is_tracked(struct rdma_restrack_entry *res)
 173 {
 174         return !res->no_track;
 175 }
 176 #endif /* _RDMA_RESTRACK_H_ */