mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Jason Gunthorpe](/assets/img/avatar_default.png)
Now that all callers provide a non-NULL attrs the ufile is redundant. Adjust things so that the context handling is done inside alloc_uobj, and the ib_uverbs_get_ucontext_file() is avoided if we already have the context. Link: https://lore.kernel.org/r/1578504126-9400-13-git-send-email-yishaih@mellanox.com Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
205 lines
7.1 KiB
C
205 lines
7.1 KiB
C
/*
|
|
* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#ifndef _UVERBS_TYPES_
|
|
#define _UVERBS_TYPES_
|
|
|
|
#include <linux/kernel.h>
|
|
#include <rdma/ib_verbs.h>
|
|
|
|
struct uverbs_obj_type;
|
|
struct uverbs_api_object;
|
|
|
|
enum rdma_lookup_mode {
|
|
UVERBS_LOOKUP_READ,
|
|
UVERBS_LOOKUP_WRITE,
|
|
/*
|
|
* Destroy is like LOOKUP_WRITE, except that the uobject is not
|
|
* locked. uobj_destroy is used to convert a LOOKUP_DESTROY lock into
|
|
* a LOOKUP_WRITE lock.
|
|
*/
|
|
UVERBS_LOOKUP_DESTROY,
|
|
};
|
|
|
|
/*
|
|
* The following sequences are valid:
|
|
* Success flow:
|
|
* alloc_begin
|
|
* alloc_commit
|
|
* [..]
|
|
* Access flow:
|
|
* lookup_get(exclusive=false) & uverbs_try_lock_object
|
|
* lookup_put(exclusive=false) via rdma_lookup_put_uobject
|
|
* Destruction flow:
|
|
* lookup_get(exclusive=true) & uverbs_try_lock_object
|
|
* remove_commit
|
|
* remove_handle (optional)
|
|
* lookup_put(exclusive=true) via rdma_lookup_put_uobject
|
|
*
|
|
* Allocate Error flow #1
|
|
* alloc_begin
|
|
* alloc_abort
|
|
* Allocate Error flow #2
|
|
* alloc_begin
|
|
* remove_commit
|
|
* alloc_abort
|
|
* Allocate Error flow #3
|
|
* alloc_begin
|
|
* alloc_commit (fails)
|
|
* remove_commit
|
|
* alloc_abort
|
|
*
|
|
* In all cases the caller must hold the ufile kref until alloc_commit or
|
|
* alloc_abort returns.
|
|
*/
|
|
struct uverbs_obj_type_class {
|
|
struct ib_uobject *(*alloc_begin)(const struct uverbs_api_object *obj,
|
|
struct uverbs_attr_bundle *attrs);
|
|
/* This consumes the kref on uobj */
|
|
void (*alloc_commit)(struct ib_uobject *uobj);
|
|
/* This does not consume the kref on uobj */
|
|
void (*alloc_abort)(struct ib_uobject *uobj);
|
|
|
|
struct ib_uobject *(*lookup_get)(const struct uverbs_api_object *obj,
|
|
struct ib_uverbs_file *ufile, s64 id,
|
|
enum rdma_lookup_mode mode);
|
|
void (*lookup_put)(struct ib_uobject *uobj, enum rdma_lookup_mode mode);
|
|
/* This does not consume the kref on uobj */
|
|
int __must_check (*destroy_hw)(struct ib_uobject *uobj,
|
|
enum rdma_remove_reason why,
|
|
struct uverbs_attr_bundle *attrs);
|
|
void (*remove_handle)(struct ib_uobject *uobj);
|
|
};
|
|
|
|
struct uverbs_obj_type {
|
|
const struct uverbs_obj_type_class * const type_class;
|
|
size_t obj_size;
|
|
};
|
|
|
|
/*
|
|
* Objects type classes which support a detach state (object is still alive but
|
|
* it's not attached to any context need to make sure:
|
|
* (a) no call through to a driver after a detach is called
|
|
* (b) detach isn't called concurrently with context_cleanup
|
|
*/
|
|
|
|
struct uverbs_obj_idr_type {
|
|
/*
|
|
* In idr based objects, uverbs_obj_type_class points to a generic
|
|
* idr operations. In order to specialize the underlying types (e.g. CQ,
|
|
* QPs, etc.), we add destroy_object specific callbacks.
|
|
*/
|
|
struct uverbs_obj_type type;
|
|
|
|
/* Free driver resources from the uobject, make the driver uncallable,
|
|
* and move the uobject to the detached state. If the object was
|
|
* destroyed by the user's request, a failure should leave the uobject
|
|
* completely unchanged.
|
|
*/
|
|
int __must_check (*destroy_object)(struct ib_uobject *uobj,
|
|
enum rdma_remove_reason why,
|
|
struct uverbs_attr_bundle *attrs);
|
|
};
|
|
|
|
struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj,
|
|
struct ib_uverbs_file *ufile, s64 id,
|
|
enum rdma_lookup_mode mode,
|
|
struct uverbs_attr_bundle *attrs);
|
|
void rdma_lookup_put_uobject(struct ib_uobject *uobj,
|
|
enum rdma_lookup_mode mode);
|
|
struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj,
|
|
struct uverbs_attr_bundle *attrs);
|
|
void rdma_alloc_abort_uobject(struct ib_uobject *uobj,
|
|
struct uverbs_attr_bundle *attrs);
|
|
void rdma_alloc_commit_uobject(struct ib_uobject *uobj,
|
|
struct uverbs_attr_bundle *attrs);
|
|
|
|
/*
|
|
* uverbs_uobject_get is called in order to increase the reference count on
|
|
* an uobject. This is useful when a handler wants to keep the uobject's memory
|
|
* alive, regardless if this uobject is still alive in the context's objects
|
|
* repository. Objects are put via uverbs_uobject_put.
|
|
*/
|
|
static inline void uverbs_uobject_get(struct ib_uobject *uobject)
|
|
{
|
|
kref_get(&uobject->ref);
|
|
}
|
|
void uverbs_uobject_put(struct ib_uobject *uobject);
|
|
|
|
struct uverbs_obj_fd_type {
|
|
/*
|
|
* In fd based objects, uverbs_obj_type_ops points to generic
|
|
* fd operations. In order to specialize the underlying types (e.g.
|
|
* completion_channel), we use fops, name and flags for fd creation.
|
|
* destroy_object is called when the uobject is to be destroyed,
|
|
* because the driver is removed or the FD is closed.
|
|
*/
|
|
struct uverbs_obj_type type;
|
|
int (*destroy_object)(struct ib_uobject *uobj,
|
|
enum rdma_remove_reason why);
|
|
const struct file_operations *fops;
|
|
const char *name;
|
|
int flags;
|
|
};
|
|
|
|
extern const struct uverbs_obj_type_class uverbs_idr_class;
|
|
extern const struct uverbs_obj_type_class uverbs_fd_class;
|
|
int uverbs_uobject_fd_release(struct inode *inode, struct file *filp);
|
|
|
|
#define UVERBS_BUILD_BUG_ON(cond) (sizeof(char[1 - 2 * !!(cond)]) - \
|
|
sizeof(char))
|
|
#define UVERBS_TYPE_ALLOC_FD(_obj_size, _destroy_object, _fops, _name, _flags) \
|
|
((&((const struct uverbs_obj_fd_type) \
|
|
{.type = { \
|
|
.type_class = &uverbs_fd_class, \
|
|
.obj_size = (_obj_size) + \
|
|
UVERBS_BUILD_BUG_ON((_obj_size) < \
|
|
sizeof(struct ib_uobject)), \
|
|
}, \
|
|
.destroy_object = _destroy_object, \
|
|
.fops = _fops, \
|
|
.name = _name, \
|
|
.flags = _flags}))->type)
|
|
#define UVERBS_TYPE_ALLOC_IDR_SZ(_size, _destroy_object) \
|
|
((&((const struct uverbs_obj_idr_type) \
|
|
{.type = { \
|
|
.type_class = &uverbs_idr_class, \
|
|
.obj_size = (_size) + \
|
|
UVERBS_BUILD_BUG_ON((_size) < \
|
|
sizeof(struct ib_uobject)) \
|
|
}, \
|
|
.destroy_object = _destroy_object,}))->type)
|
|
#define UVERBS_TYPE_ALLOC_IDR(_destroy_object) \
|
|
UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uobject), \
|
|
_destroy_object)
|
|
|
|
#endif
|