drivers/infiniband/core/uverbs_std_types_counters.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/core/uverbs_std_types_counters.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/core/uverbs_std_types_counters.c
Extension
.c
Size
5094 bytes
Lines
164
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2018, 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_core.h"
#include "uverbs.h"
#include <rdma/uverbs_std_types.h>

static int uverbs_free_counters(struct ib_uobject *uobject,
				enum rdma_remove_reason why,
				struct uverbs_attr_bundle *attrs)
{
	struct ib_counters *counters = uobject->object;
	int ret;

	if (atomic_read(&counters->usecnt))
		return -EBUSY;

	ret = counters->device->ops.destroy_counters(counters);
	if (ret)
		return ret;
	kfree(counters);
	return 0;
}

static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)(
	struct uverbs_attr_bundle *attrs)
{
	struct ib_uobject *uobj = uverbs_attr_get_uobject(
		attrs, UVERBS_ATTR_CREATE_COUNTERS_HANDLE);
	struct ib_device *ib_dev = attrs->context->device;
	struct ib_counters *counters;
	int ret;

	/*
	 * This check should be removed once the infrastructure
	 * have the ability to remove methods from parse tree once
	 * such condition is met.
	 */
	if (!ib_dev->ops.create_counters)
		return -EOPNOTSUPP;

	counters = rdma_zalloc_drv_obj(ib_dev, ib_counters);
	if (!counters)
		return -ENOMEM;

	counters->device = ib_dev;
	counters->uobject = uobj;
	uobj->object = counters;
	atomic_set(&counters->usecnt, 0);

	ret = ib_dev->ops.create_counters(counters, attrs);
	if (ret)
		kfree(counters);

	return ret;
}

static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(
	struct uverbs_attr_bundle *attrs)
{

Annotation

Implementation Notes