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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
*/
#ifndef _RDMA_RESTRACK_H_
#define _RDMA_RESTRACK_H_
#include <linux/typecheck.h>
#include <linux/sched.h>
#include <linux/kref.h>
#include <linux/completion.h>
#include <linux/sched/task.h>
#include <uapi/rdma/rdma_netlink.h>
#include <linux/xarray.h>
struct ib_device;
struct sk_buff;
/**
* enum rdma_restrack_type - HW objects to track
*/
enum rdma_restrack_type {
/**
* @RDMA_RESTRACK_PD: Protection domain (PD)
*/
RDMA_RESTRACK_PD,
/**
* @RDMA_RESTRACK_CQ: Completion queue (CQ)
*/
RDMA_RESTRACK_CQ,
/**
* @RDMA_RESTRACK_QP: Queue pair (QP)
*/
RDMA_RESTRACK_QP,
/**
* @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
*/
RDMA_RESTRACK_CM_ID,
/**
* @RDMA_RESTRACK_MR: Memory Region (MR)
*/
RDMA_RESTRACK_MR,
/**
* @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
*/
RDMA_RESTRACK_CTX,
/**
* @RDMA_RESTRACK_COUNTER: Statistic Counter
*/
RDMA_RESTRACK_COUNTER,
/**
* @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
*/
RDMA_RESTRACK_MAX
};
/**
* struct rdma_restrack_entry - metadata per-entry
*/
struct rdma_restrack_entry {
/**
* @valid: validity indicator
*
* The entries are filled during rdma_restrack_add,
* can be attempted to be free during rdma_restrack_del.
*
* As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
*/
bool valid;
/**
* @no_track: don't add this entry to restrack DB
*
* This field is used to mark an entry that doesn't need to be added to
* internal restrack DB and presented later to the users at the nldev
* query stage.
*/
u8 no_track : 1;
/*
* @kref: Protect destroy of the resource
*/
struct kref kref;
/*
* @comp: Signal that all consumers of resource are completed their work
*/
struct completion comp;
/**
* @task: owner of resource tracking entity
*
* There are two types of entities: created by user and created
* by kernel.
*
* This is relevant for the entities created by users.
* For the entities created by kernel, this pointer will be NULL.
*/
struct task_struct *task;
/**
* @kern_name: name of owner for the kernel created entities.
*/
const char *kern_name;
/**
* @type: various objects in restrack database
*/
enum rdma_restrack_type type;
/**
* @user: user resource
*/
bool user;
/**
* @id: ID to expose to users
*/
u32 id;
};
int rdma_restrack_count(struct ib_device *dev,
enum rdma_restrack_type type);
/**
* rdma_is_kernel_res() - check the owner of resource
* @res: resource entry
*/
static inline bool rdma_is_kernel_res(const struct rdma_restrack_entry *res)
{
return !res->user;
}
/**
* rdma_restrack_get() - grab to protect resource from release
* @res: resource entry
*/
int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
/**
* rdma_restrack_put() - release resource
* @res: resource entry
*/
int rdma_restrack_put(struct rdma_restrack_entry *res);
/*
* Helper functions for rdma drivers when filling out
* nldev driver attributes.
*/
int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
u32 value);
int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
u64 value);
int rdma_nl_put_driver_string(struct sk_buff *msg, const char *name,
const char *str);
int rdma_nl_stat_hwcounter_entry(struct sk_buff *msg, const char *name,
u64 value);
struct rdma_restrack_entry *rdma_restrack_get_byid(struct ib_device *dev,
enum rdma_restrack_type type,
u32 id);
/**
* rdma_restrack_no_track() - don't add resource to the DB
* @res: resource entry
*
* Every user of thie API should be cross examined.
* Probaby you don't need to use this function.
*/
static inline void rdma_restrack_no_track(struct rdma_restrack_entry *res)
{
res->no_track = true;
}
static inline bool rdma_restrack_is_tracked(struct rdma_restrack_entry *res)
{
return !res->no_track;
}
#endif /* _RDMA_RESTRACK_H_ */
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