linux/drivers/infiniband/core/uverbs_std_types_cq.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.
 */

#include <rdma/uverbs_std_types.h>
#include "rdma_core.h"
#include "uverbs.h"
#include "restrack.h"

static int uverbs_free_cq(struct ib_uobject *uobject,
			  enum rdma_remove_reason why,
			  struct uverbs_attr_bundle *attrs)
{ … }

static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
	struct uverbs_attr_bundle *attrs)
{
	struct ib_ucq_object *obj = container_of(
		uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE),
		typeof(*obj), uevent.uobject);
	struct ib_device *ib_dev = attrs->context->device;
	int ret;
	u64 user_handle;
	struct ib_cq_init_attr attr = {};
	struct ib_cq                   *cq;
	struct ib_uverbs_completion_event_file    *ev_file = NULL;
	struct ib_uobject *ev_file_uobj;

	if (!ib_dev->ops.create_cq || !ib_dev->ops.destroy_cq)
		return -EOPNOTSUPP;

	ret = uverbs_copy_from(&attr.comp_vector, attrs,
			       UVERBS_ATTR_CREATE_CQ_COMP_VECTOR);
	if (!ret)
		ret = uverbs_copy_from(&attr.cqe, attrs,
				       UVERBS_ATTR_CREATE_CQ_CQE);
	if (!ret)
		ret = uverbs_copy_from(&user_handle, attrs,
				       UVERBS_ATTR_CREATE_CQ_USER_HANDLE);
	if (ret)
		return ret;

	ret = uverbs_get_flags32(&attr.flags, attrs,
				 UVERBS_ATTR_CREATE_CQ_FLAGS,
				 IB_UVERBS_CQ_FLAGS_TIMESTAMP_COMPLETION |
					 IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN);
	if (ret)
		return ret;

	ev_file_uobj = uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_COMP_CHANNEL);
	if (!IS_ERR(ev_file_uobj)) {
		ev_file = container_of(ev_file_uobj,
				       struct ib_uverbs_completion_event_file,
				       uobj);
		uverbs_uobject_get(ev_file_uobj);
	}

	obj->uevent.event_file = ib_uverbs_get_async_event(
		attrs, UVERBS_ATTR_CREATE_CQ_EVENT_FD);

	if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) {
		ret = -EINVAL;
		goto err_event_file;
	}

	INIT_LIST_HEAD(&obj->comp_list);
	INIT_LIST_HEAD(&obj->uevent.event_list);

	cq = rdma_zalloc_drv_obj(ib_dev, ib_cq);
	if (!cq) {
		ret = -ENOMEM;
		goto err_event_file;
	}

	cq->device        = ib_dev;
	cq->uobject       = obj;
	cq->comp_handler  = ib_uverbs_comp_handler;
	cq->event_handler = ib_uverbs_cq_event_handler;
	cq->cq_context    = ev_file ? &ev_file->ev_queue : NULL;
	atomic_set(&cq->usecnt, 0);

	rdma_restrack_new(&cq->res, RDMA_RESTRACK_CQ);
	rdma_restrack_set_name(&cq->res, NULL);

	ret = ib_dev->ops.create_cq(cq, &attr, attrs);
	if (ret)
		goto err_free;

	obj->uevent.uobject.object = cq;
	obj->uevent.uobject.user_handle = user_handle;
	rdma_restrack_add(&cq->res);
	uverbs_finalize_uobj_create(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE);

	ret = uverbs_copy_to(attrs, UVERBS_ATTR_CREATE_CQ_RESP_CQE, &cq->cqe,
			     sizeof(cq->cqe));
	return ret;

err_free:
	rdma_restrack_put(&cq->res);
	kfree(cq);
err_event_file:
	if (obj->uevent.event_file)
		uverbs_uobject_put(&obj->uevent.event_file->uobj);
	if (ev_file)
		uverbs_uobject_put(ev_file_uobj);
	return ret;
};

DECLARE_UVERBS_NAMED_METHOD(…);

static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(
	struct uverbs_attr_bundle *attrs)
{ … }

DECLARE_UVERBS_NAMED_METHOD(…);

DECLARE_UVERBS_NAMED_OBJECT(…);

const struct uapi_definition uverbs_def_obj_cq[] = …;