1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/*
3 * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses.  You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 *     Redistribution and use in source and binary forms, with or
12 *     without modification, are permitted provided that the following
13 *     conditions are met:
14 *
15 *      - Redistributions of source code must retain the above
16 *        copyright notice, this list of conditions and the following
17 *        disclaimer.
18 *
19 *      - Redistributions in binary form must reproduce the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer in the documentation and/or other materials
22 *        provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include "rdma_core.h"
35#include "uverbs.h"
36#include <rdma/uverbs_std_types.h>
37
38#include <linux/overflow.h>
39
40static int uverbs_free_counters(struct ib_uobject *uobject,
41				enum rdma_remove_reason why,
42				struct uverbs_attr_bundle *attrs)
43{
44	struct ib_counters *counters = uobject->object;
45	int ret;
46
47	ret = ib_destroy_usecnt(&counters->usecnt, why, uobject);
48	if (ret)
49		return ret;
50
51	return counters->device->destroy_counters(counters);
52}
53
54static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)(
55	struct uverbs_attr_bundle *attrs)
56{
57	struct ib_uobject *uobj = uverbs_attr_get_uobject(
58		attrs, UVERBS_ATTR_CREATE_COUNTERS_HANDLE);
59	struct ib_device *ib_dev = attrs->context->device;
60	struct ib_counters *counters;
61	int ret;
62
63	/*
64	 * This check should be removed once the infrastructure
65	 * have the ability to remove methods from parse tree once
66	 * such condition is met.
67	 */
68	if (!ib_dev->create_counters)
69		return -EOPNOTSUPP;
70
71	counters = ib_dev->create_counters(ib_dev, attrs);
72	if (IS_ERR(counters)) {
73		ret = PTR_ERR(counters);
74		goto err_create_counters;
75	}
76
77	counters->device = ib_dev;
78	counters->uobject = uobj;
79	uobj->object = counters;
80	atomic_set(&counters->usecnt, 0);
81
82	return 0;
83
84err_create_counters:
85	return ret;
86}
87
88static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(
89	struct uverbs_attr_bundle *attrs)
90{
91	struct ib_counters_read_attr read_attr = {};
92	const struct uverbs_attr *uattr;
93	struct ib_counters *counters =
94		uverbs_attr_get_obj(attrs, UVERBS_ATTR_READ_COUNTERS_HANDLE);
95	int ret;
96
97	if (!counters->device->read_counters)
98		return -EOPNOTSUPP;
99
100	if (!atomic_read(&counters->usecnt))
101		return -EINVAL;
102
103	ret = uverbs_get_flags32(&read_attr.flags, attrs,
104				 UVERBS_ATTR_READ_COUNTERS_FLAGS,
105				 IB_UVERBS_READ_COUNTERS_PREFER_CACHED);
106	if (ret)
107		return ret;
108
109	uattr = uverbs_attr_get(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF);
110	read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
111	read_attr.counters_buff = uverbs_zalloc(
112		attrs, array_size(read_attr.ncounters, sizeof(u64)));
113	if (IS_ERR(read_attr.counters_buff))
114		return PTR_ERR(read_attr.counters_buff);
115
116	ret = counters->device->read_counters(counters, &read_attr, attrs);
117	if (ret)
118		return ret;
119
120	return uverbs_copy_to(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF,
121			      read_attr.counters_buff,
122			      read_attr.ncounters * sizeof(u64));
123}
124
125DECLARE_UVERBS_NAMED_METHOD(
126	UVERBS_METHOD_COUNTERS_CREATE,
127	UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_COUNTERS_HANDLE,
128			UVERBS_OBJECT_COUNTERS,
129			UVERBS_ACCESS_NEW,
130			UA_MANDATORY));
131
132DECLARE_UVERBS_NAMED_METHOD_DESTROY(
133	UVERBS_METHOD_COUNTERS_DESTROY,
134	UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_COUNTERS_HANDLE,
135			UVERBS_OBJECT_COUNTERS,
136			UVERBS_ACCESS_DESTROY,
137			UA_MANDATORY));
138
139DECLARE_UVERBS_NAMED_METHOD(
140	UVERBS_METHOD_COUNTERS_READ,
141	UVERBS_ATTR_IDR(UVERBS_ATTR_READ_COUNTERS_HANDLE,
142			UVERBS_OBJECT_COUNTERS,
143			UVERBS_ACCESS_READ,
144			UA_MANDATORY),
145	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_READ_COUNTERS_BUFF,
146			    UVERBS_ATTR_MIN_SIZE(0),
147			    UA_MANDATORY),
148	UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_READ_COUNTERS_FLAGS,
149			     enum ib_uverbs_read_counters_flags));
150
151DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_COUNTERS,
152			    UVERBS_TYPE_ALLOC_IDR(uverbs_free_counters),
153			    &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_CREATE),
154			    &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY),
155			    &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_READ));
156
157const struct uapi_definition uverbs_def_obj_counters[] = {
158	UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_COUNTERS,
159				      UAPI_DEF_OBJ_NEEDS_FN(destroy_counters)),
160	{}
161};
162