/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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/*
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* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
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*/
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#ifndef _UVERBS_TYPES_
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#define _UVERBS_TYPES_
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#include <linux/kernel.h>
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#include <rdma/ib_verbs.h>
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struct uverbs_obj_type;
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struct uverbs_api_object;
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enum rdma_lookup_mode {
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UVERBS_LOOKUP_READ,
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UVERBS_LOOKUP_WRITE,
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/*
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* Destroy is like LOOKUP_WRITE, except that the uobject is not
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* locked. uobj_destroy is used to convert a LOOKUP_DESTROY lock into
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* a LOOKUP_WRITE lock.
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*/
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UVERBS_LOOKUP_DESTROY,
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};
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/*
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* The following sequences are valid:
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* Success flow:
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* alloc_begin
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* alloc_commit
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* [..]
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* Access flow:
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* lookup_get(exclusive=false) & uverbs_try_lock_object
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* lookup_put(exclusive=false) via rdma_lookup_put_uobject
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* Destruction flow:
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* lookup_get(exclusive=true) & uverbs_try_lock_object
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* remove_commit
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* remove_handle (optional)
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* lookup_put(exclusive=true) via rdma_lookup_put_uobject
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*
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* Allocate Error flow #1
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* alloc_begin
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* alloc_abort
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* Allocate Error flow #2
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* alloc_begin
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* remove_commit
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* alloc_abort
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* Allocate Error flow #3
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* alloc_begin
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* alloc_commit (fails)
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* remove_commit
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* alloc_abort
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*
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* In all cases the caller must hold the ufile kref until alloc_commit or
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* alloc_abort returns.
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*/
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struct uverbs_obj_type_class {
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struct ib_uobject *(*alloc_begin)(const struct uverbs_api_object *obj,
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struct uverbs_attr_bundle *attrs);
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/* This consumes the kref on uobj */
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void (*alloc_commit)(struct ib_uobject *uobj);
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/* This does not consume the kref on uobj */
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void (*alloc_abort)(struct ib_uobject *uobj);
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struct ib_uobject *(*lookup_get)(const struct uverbs_api_object *obj,
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struct ib_uverbs_file *ufile, s64 id,
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enum rdma_lookup_mode mode);
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void (*lookup_put)(struct ib_uobject *uobj, enum rdma_lookup_mode mode);
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/* This does not consume the kref on uobj */
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int __must_check (*destroy_hw)(struct ib_uobject *uobj,
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enum rdma_remove_reason why,
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struct uverbs_attr_bundle *attrs);
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void (*remove_handle)(struct ib_uobject *uobj);
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};
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struct uverbs_obj_type {
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const struct uverbs_obj_type_class * const type_class;
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size_t obj_size;
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};
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/*
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* Objects type classes which support a detach state (object is still alive but
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* it's not attached to any context need to make sure:
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* (a) no call through to a driver after a detach is called
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* (b) detach isn't called concurrently with context_cleanup
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*/
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struct uverbs_obj_idr_type {
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/*
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* In idr based objects, uverbs_obj_type_class points to a generic
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* idr operations. In order to specialize the underlying types (e.g. CQ,
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* QPs, etc.), we add destroy_object specific callbacks.
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*/
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struct uverbs_obj_type type;
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/* Free driver resources from the uobject, make the driver uncallable,
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* and move the uobject to the detached state. If the object was
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* destroyed by the user's request, a failure should leave the uobject
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* completely unchanged.
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*/
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int __must_check (*destroy_object)(struct ib_uobject *uobj,
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enum rdma_remove_reason why,
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struct uverbs_attr_bundle *attrs);
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};
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struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj,
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struct ib_uverbs_file *ufile, s64 id,
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enum rdma_lookup_mode mode,
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struct uverbs_attr_bundle *attrs);
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void rdma_lookup_put_uobject(struct ib_uobject *uobj,
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enum rdma_lookup_mode mode);
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struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj,
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struct uverbs_attr_bundle *attrs);
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void rdma_alloc_abort_uobject(struct ib_uobject *uobj,
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struct uverbs_attr_bundle *attrs,
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bool hw_obj_valid);
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void rdma_alloc_commit_uobject(struct ib_uobject *uobj,
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struct uverbs_attr_bundle *attrs);
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/*
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* uverbs_uobject_get is called in order to increase the reference count on
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* an uobject. This is useful when a handler wants to keep the uobject's memory
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* alive, regardless if this uobject is still alive in the context's objects
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* repository. Objects are put via uverbs_uobject_put.
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*/
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static inline void uverbs_uobject_get(struct ib_uobject *uobject)
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{
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kref_get(&uobject->ref);
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}
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void uverbs_uobject_put(struct ib_uobject *uobject);
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struct uverbs_obj_fd_type {
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/*
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* In fd based objects, uverbs_obj_type_ops points to generic
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* fd operations. In order to specialize the underlying types (e.g.
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* completion_channel), we use fops, name and flags for fd creation.
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* destroy_object is called when the uobject is to be destroyed,
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* because the driver is removed or the FD is closed.
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*/
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struct uverbs_obj_type type;
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int (*destroy_object)(struct ib_uobject *uobj,
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enum rdma_remove_reason why);
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const struct file_operations *fops;
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const char *name;
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int flags;
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};
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extern const struct uverbs_obj_type_class uverbs_idr_class;
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extern const struct uverbs_obj_type_class uverbs_fd_class;
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int uverbs_uobject_fd_release(struct inode *inode, struct file *filp);
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#define UVERBS_BUILD_BUG_ON(cond) (sizeof(char[1 - 2 * !!(cond)]) - \
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sizeof(char))
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#define UVERBS_TYPE_ALLOC_FD(_obj_size, _destroy_object, _fops, _name, _flags) \
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((&((const struct uverbs_obj_fd_type) \
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{.type = { \
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.type_class = &uverbs_fd_class, \
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.obj_size = (_obj_size) + \
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UVERBS_BUILD_BUG_ON((_obj_size) < \
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sizeof(struct ib_uobject)), \
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}, \
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.destroy_object = _destroy_object, \
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.fops = _fops, \
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.name = _name, \
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.flags = _flags}))->type)
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#define UVERBS_TYPE_ALLOC_IDR_SZ(_size, _destroy_object) \
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((&((const struct uverbs_obj_idr_type) \
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{.type = { \
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.type_class = &uverbs_idr_class, \
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.obj_size = (_size) + \
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UVERBS_BUILD_BUG_ON((_size) < \
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sizeof(struct ib_uobject)) \
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}, \
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.destroy_object = _destroy_object,}))->type)
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#define UVERBS_TYPE_ALLOC_IDR(_destroy_object) \
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UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uobject), \
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_destroy_object)
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#endif
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