uverbs_types.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
 * Copyright (c) 2017, Mellanox Technologies inc.  All rights reserved.
 */

#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 { … };

/*
 * 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 uverbs_obj_type { … };

/*
 * 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 { … };

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,
			      bool hw_obj_valid);
void rdma_alloc_commit_uobject(struct ib_uobject *uobj,
			       struct uverbs_attr_bundle *attrs);
void rdma_assign_uobject(struct ib_uobject *to_uobj,
			 struct ib_uobject *new_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)
{ … }
void uverbs_uobject_put(struct ib_uobject *uobject);

struct uverbs_obj_fd_type { … };

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) …
#define UVERBS_TYPE_ALLOC_FD(_obj_size, _destroy_object, _fops, _name, _flags) …
#define UVERBS_TYPE_ALLOC_IDR_SZ(_size, _destroy_object) …
#define UVERBS_TYPE_ALLOC_IDR(_destroy_object) …

#endif
linux/include/rdma/uverbs_types.h
