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/*
* Copyright (c) 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
* Copyright (c) 2005-2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
* Copyright (c) 2005 PathScale, 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 RDMA_CORE_H
#define RDMA_CORE_H
#include <linux/idr.h>
#include <rdma/uverbs_types.h>
#include <rdma/uverbs_ioctl.h>
#include <rdma/ib_verbs.h>
#include <linux/mutex.h>
struct ib_uverbs_device;
void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile,
enum rdma_remove_reason reason);
int uobj_destroy(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.
*/
void uverbs_uobject_get(struct ib_uobject *uobject);
/*
* In order to indicate we no longer needs this uobject, uverbs_uobject_put
* is called. When the reference count is decreased, the uobject is freed.
* For example, this is used when attaching a completion channel to a CQ.
*/
void uverbs_uobject_put(struct ib_uobject *uobject);
/* Indicate this fd is no longer used by this consumer, but its memory isn't
* necessarily released yet. When the last reference is put, we release the
* memory. After this call is executed, calling uverbs_uobject_get isn't
* allowed.
* This must be called from the release file_operations of the file!
*/
void uverbs_close_fd(struct file *f);
/*
* Get an ib_uobject that corresponds to the given id from ufile, assuming
* the object is from the given type. Lock it to the required access when
* applicable.
* This function could create (access == NEW), destroy (access == DESTROY)
* or unlock (access == READ || access == WRITE) objects if required.
* The action will be finalized only when uverbs_finalize_object or
* uverbs_finalize_objects are called.
*/
struct ib_uobject *
uverbs_get_uobject_from_file(u16 object_id, enum uverbs_obj_access access,
s64 id, struct uverbs_attr_bundle *attrs);
/*
* Note that certain finalize stages could return a status:
* (a) alloc_commit could return a failure if the object is committed at the
* same time when the context is destroyed.
* (b) remove_commit could fail if the object wasn't destroyed successfully.
* Since multiple objects could be finalized in one transaction, it is very NOT
* recommended to have several finalize actions which have side effects.
* For example, it's NOT recommended to have a certain action which has both
* a commit action and a destroy action or two destroy objects in the same
* action. The rule of thumb is to have one destroy or commit action with
* multiple lookups.
* The first non zero return value of finalize_object is returned from this
* function. For example, this could happen when we couldn't destroy an
* object.
*/
int uverbs_finalize_object(struct ib_uobject *uobj,
enum uverbs_obj_access access, bool commit,
struct uverbs_attr_bundle *attrs);
int uverbs_output_written(const struct uverbs_attr_bundle *bundle, size_t idx);
void setup_ufile_idr_uobject(struct ib_uverbs_file *ufile);
void release_ufile_idr_uobject(struct ib_uverbs_file *ufile);
/*
* This is the runtime description of the uverbs API, used by the syscall
* machinery to validate and dispatch calls.
*/
/*
* Depending on ID the slot pointer in the radix tree points at one of these
* structs.
*/
struct uverbs_api_ioctl_method {
int(__rcu *handler)(struct uverbs_attr_bundle *attrs);
DECLARE_BITMAP(attr_mandatory, UVERBS_API_ATTR_BKEY_LEN);
u16 bundle_size;
u8 use_stack:1;
u8 driver_method:1;
u8 disabled:1;
u8 has_udata:1;
u8 key_bitmap_len;
u8 destroy_bkey;
};
struct uverbs_api_write_method {
int (*handler)(struct uverbs_attr_bundle *attrs);
u8 disabled:1;
u8 is_ex:1;
u8 has_udata:1;
u8 has_resp:1;
u8 req_size;
u8 resp_size;
};
struct uverbs_api_attr {
struct uverbs_attr_spec spec;
};
struct uverbs_api {
/* radix tree contains struct uverbs_api_* pointers */
struct radix_tree_root radix;
enum rdma_driver_id driver_id;
unsigned int num_write;
unsigned int num_write_ex;
struct uverbs_api_write_method notsupp_method;
const struct uverbs_api_write_method **write_methods;
const struct uverbs_api_write_method **write_ex_methods;
};
/*
* Get an uverbs_api_object that corresponds to the given object_id.
* Note:
* -ENOMSG means that any object is allowed to match during lookup.
*/
static inline const struct uverbs_api_object *
uapi_get_object(struct uverbs_api *uapi, u16 object_id)
{
const struct uverbs_api_object *res;
if (object_id == UVERBS_IDR_ANY_OBJECT)
return ERR_PTR(-ENOMSG);
res = radix_tree_lookup(&uapi->radix, uapi_key_obj(object_id));
if (!res)
return ERR_PTR(-ENOENT);
return res;
}
char *uapi_key_format(char *S, unsigned int key);
struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev);
void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev);
void uverbs_disassociate_api(struct uverbs_api *uapi);
void uverbs_destroy_api(struct uverbs_api *uapi);
void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
unsigned int num_attrs);
void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile);
extern const struct uapi_definition uverbs_def_obj_counters[];
extern const struct uapi_definition uverbs_def_obj_cq[];
extern const struct uapi_definition uverbs_def_obj_device[];
extern const struct uapi_definition uverbs_def_obj_dm[];
extern const struct uapi_definition uverbs_def_obj_flow_action[];
extern const struct uapi_definition uverbs_def_obj_intf[];
extern const struct uapi_definition uverbs_def_obj_mr[];
extern const struct uapi_definition uverbs_def_write_intf[];
static inline const struct uverbs_api_write_method *
uapi_get_method(const struct uverbs_api *uapi, u32 command)
{
u32 cmd_idx = command & IB_USER_VERBS_CMD_COMMAND_MASK;
if (command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
IB_USER_VERBS_CMD_COMMAND_MASK))
return ERR_PTR(-EINVAL);
if (command & IB_USER_VERBS_CMD_FLAG_EXTENDED) {
if (cmd_idx >= uapi->num_write_ex)
return ERR_PTR(-EOPNOTSUPP);
return uapi->write_ex_methods[cmd_idx];
}
if (cmd_idx >= uapi->num_write)
return ERR_PTR(-EOPNOTSUPP);
return uapi->write_methods[cmd_idx];
}
void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
struct ib_udata *udata, unsigned int attr_in,
unsigned int attr_out);
#endif /* RDMA_CORE_H */
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