159 lines
3.8 KiB
C
159 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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/*
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* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
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*/
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#ifndef _RDMA_RESTRACK_H_
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#define _RDMA_RESTRACK_H_
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#include <linux/typecheck.h>
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#include <linux/sched.h>
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#include <linux/kref.h>
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#include <linux/completion.h>
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#include <linux/sched/task.h>
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#include <uapi/rdma/rdma_netlink.h>
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#include <linux/xarray.h>
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/**
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* enum rdma_restrack_type - HW objects to track
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*/
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enum rdma_restrack_type {
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/**
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* @RDMA_RESTRACK_PD: Protection domain (PD)
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*/
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RDMA_RESTRACK_PD,
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/**
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* @RDMA_RESTRACK_CQ: Completion queue (CQ)
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*/
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RDMA_RESTRACK_CQ,
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/**
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* @RDMA_RESTRACK_QP: Queue pair (QP)
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*/
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RDMA_RESTRACK_QP,
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/**
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* @RDMA_RESTRACK_CM_ID: Connection Manager ID (CM_ID)
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*/
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RDMA_RESTRACK_CM_ID,
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/**
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* @RDMA_RESTRACK_MR: Memory Region (MR)
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*/
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RDMA_RESTRACK_MR,
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/**
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* @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
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*/
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RDMA_RESTRACK_CTX,
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/**
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* @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
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*/
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RDMA_RESTRACK_MAX
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};
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struct ib_device;
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/**
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* struct rdma_restrack_entry - metadata per-entry
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*/
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struct rdma_restrack_entry {
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/**
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* @valid: validity indicator
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*
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* The entries are filled during rdma_restrack_add,
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* can be attempted to be free during rdma_restrack_del.
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*
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* As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
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*/
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bool valid;
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/*
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* @kref: Protect destroy of the resource
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*/
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struct kref kref;
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/*
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* @comp: Signal that all consumers of resource are completed their work
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*/
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struct completion comp;
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/**
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* @task: owner of resource tracking entity
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*
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* There are two types of entities: created by user and created
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* by kernel.
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*
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* This is relevant for the entities created by users.
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* For the entities created by kernel, this pointer will be NULL.
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*/
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struct task_struct *task;
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/**
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* @kern_name: name of owner for the kernel created entities.
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*/
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const char *kern_name;
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/**
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* @type: various objects in restrack database
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*/
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enum rdma_restrack_type type;
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/**
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* @user: user resource
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*/
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bool user;
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/**
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* @id: ID to expose to users
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*/
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u32 id;
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};
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int rdma_restrack_count(struct ib_device *dev,
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enum rdma_restrack_type type,
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struct pid_namespace *ns);
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void rdma_restrack_kadd(struct rdma_restrack_entry *res);
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void rdma_restrack_uadd(struct rdma_restrack_entry *res);
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/**
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* rdma_restrack_del() - delete object from the reource tracking database
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* @res: resource entry
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* @type: actual type of object to operate
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*/
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void rdma_restrack_del(struct rdma_restrack_entry *res);
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/**
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* rdma_is_kernel_res() - check the owner of resource
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* @res: resource entry
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*/
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static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
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{
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return !res->user;
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}
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/**
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* rdma_restrack_get() - grab to protect resource from release
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* @res: resource entry
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*/
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int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
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/**
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* rdma_restrack_put() - release resource
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* @res: resource entry
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*/
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int rdma_restrack_put(struct rdma_restrack_entry *res);
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/**
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* rdma_restrack_set_task() - set the task for this resource
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* @res: resource entry
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* @caller: kernel name, the current task will be used if the caller is NULL.
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*/
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void rdma_restrack_set_task(struct rdma_restrack_entry *res,
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const char *caller);
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/*
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* Helper functions for rdma drivers when filling out
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* nldev driver attributes.
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*/
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int rdma_nl_put_driver_u32(struct sk_buff *msg, const char *name, u32 value);
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int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
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u32 value);
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int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
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int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
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u64 value);
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struct rdma_restrack_entry *rdma_restrack_get_byid(struct ib_device *dev,
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enum rdma_restrack_type type,
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u32 id);
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#endif /* _RDMA_RESTRACK_H_ */
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