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/*
* 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_obj_type_class {
/*
* Get an ib_uobject that corresponds to the given id from ucontext,
* These functions could create or destroy objects if required.
* The action will be finalized only when commit, abort or put fops are
* called.
* The flow of the different actions is:
* [alloc]: Starts with alloc_begin. The handlers logic is than
* executed. If the handler is successful, alloc_commit
* is called and the object is inserted to the repository.
* Once alloc_commit completes the object is visible to
* other threads and userspace.
e Otherwise, alloc_abort is called and the object is
* destroyed.
* [lookup]: Starts with lookup_get which fetches and locks the
* object. After the handler finished using the object, it
* needs to call lookup_put to unlock it. The exclusive
* flag indicates if the object is locked for exclusive
* access.
* [remove]: Starts with lookup_get with exclusive flag set. This
* locks the object for exclusive access. If the handler
* code completed successfully, remove_commit is called
* and the ib_uobject is removed from the context's
* uobjects repository and put. The object itself is
* destroyed as well. Once remove succeeds new krefs to
* the object cannot be acquired by other threads or
* userspace and the hardware driver is removed from the
* object. Other krefs on the object may still exist.
* If the handler code failed, lookup_put should be
* called. This callback is used when the context
* is destroyed as well (process termination,
* reset flow).
*/
struct ib_uobject *(*alloc_begin)(const struct uverbs_obj_type *type,
struct ib_ucontext *ucontext);
void (*alloc_commit)(struct ib_uobject *uobj);
void (*alloc_abort)(struct ib_uobject *uobj);
struct ib_uobject *(*lookup_get)(const struct uverbs_obj_type *type,
struct ib_ucontext *ucontext, int id,
bool exclusive);
void (*lookup_put)(struct ib_uobject *uobj, bool exclusive);
/*
* Must be called with the exclusive lock held. If successful uobj is
* invalid on return. On failure uobject is left completely
* unchanged
*/
int __must_check (*remove_commit)(struct ib_uobject *uobj,
enum rdma_remove_reason why);
u8 needs_kfree_rcu;
};
struct uverbs_obj_type {
const struct uverbs_obj_type_class * const type_class;
size_t obj_size;
unsigned int destroy_order;
};
/*
* 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 ib_uobject *rdma_lookup_get_uobject(const struct uverbs_obj_type *type,
struct ib_ucontext *ucontext,
int id, bool exclusive);
void rdma_lookup_put_uobject(struct ib_uobject *uobj, bool exclusive);
struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_obj_type *type,
struct ib_ucontext *ucontext);
void rdma_alloc_abort_uobject(struct ib_uobject *uobj);
int __must_check rdma_remove_commit_uobject(struct ib_uobject *uobj);
int rdma_alloc_commit_uobject(struct ib_uobject *uobj);
int rdma_explicit_destroy(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.
* context_closed is called when the context is closed either when
* the driver is removed or the process terminated.
*/
struct uverbs_obj_type type;
int (*context_closed)(struct ib_uobject_file *uobj_file,
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;
#define UVERBS_BUILD_BUG_ON(cond) (sizeof(char[1 - 2 * !!(cond)]) - \
sizeof(char))
#define UVERBS_TYPE_ALLOC_FD(_order, _obj_size, _context_closed, _fops, _name, _flags)\
((&((const struct uverbs_obj_fd_type) \
{.type = { \
.destroy_order = _order, \
.type_class = &uverbs_fd_class, \
.obj_size = (_obj_size) + \
UVERBS_BUILD_BUG_ON((_obj_size) < sizeof(struct ib_uobject_file)), \
}, \
.context_closed = _context_closed, \
.fops = _fops, \
.name = _name, \
.flags = _flags}))->type)
#define UVERBS_TYPE_ALLOC_IDR_SZ(_size, _order, _destroy_object) \
((&((const struct uverbs_obj_idr_type) \
{.type = { \
.destroy_order = _order, \
.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(_order, _destroy_object) \
UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_uobject), _order, \
_destroy_object)
#endif
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