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
38static int uverbs_free_counters(struct ib_uobject *uobject,
39 enum rdma_remove_reason why,
40 struct uverbs_attr_bundle *attrs)
41{
42 struct ib_counters *counters = uobject->object;
43 int ret;
44
45 if (atomic_read(v: &counters->usecnt))
46 return -EBUSY;
47
48 ret = counters->device->ops.destroy_counters(counters);
49 if (ret)
50 return ret;
51 kfree(objp: counters);
52 return 0;
53}
54
55static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)(
56 struct uverbs_attr_bundle *attrs)
57{
58 struct ib_uobject *uobj = uverbs_attr_get_uobject(
59 attrs_bundle: attrs, idx: UVERBS_ATTR_CREATE_COUNTERS_HANDLE);
60 struct ib_device *ib_dev = attrs->context->device;
61 struct ib_counters *counters;
62 int ret;
63
64 /*
65 * This check should be removed once the infrastructure
66 * have the ability to remove methods from parse tree once
67 * such condition is met.
68 */
69 if (!ib_dev->ops.create_counters)
70 return -EOPNOTSUPP;
71
72 counters = rdma_zalloc_drv_obj(ib_dev, ib_counters);
73 if (!counters)
74 return -ENOMEM;
75
76 counters->device = ib_dev;
77 counters->uobject = uobj;
78 uobj->object = counters;
79 atomic_set(v: &counters->usecnt, i: 0);
80
81 ret = ib_dev->ops.create_counters(counters, attrs);
82 if (ret)
83 kfree(objp: counters);
84
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_bundle: attrs, idx: UVERBS_ATTR_READ_COUNTERS_HANDLE);
95 int ret;
96
97 if (!counters->device->ops.read_counters)
98 return -EOPNOTSUPP;
99
100 if (!atomic_read(v: &counters->usecnt))
101 return -EINVAL;
102
103 ret = uverbs_get_flags32(to: &read_attr.flags, attrs_bundle: attrs,
104 idx: UVERBS_ATTR_READ_COUNTERS_FLAGS,
105 allowed_bits: IB_UVERBS_READ_COUNTERS_PREFER_CACHED);
106 if (ret)
107 return ret;
108
109 uattr = uverbs_attr_get(attrs_bundle: attrs, idx: UVERBS_ATTR_READ_COUNTERS_BUFF);
110 if (IS_ERR(ptr: uattr))
111 return PTR_ERR(ptr: uattr);
112 read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
113 read_attr.counters_buff = uverbs_zalloc(
114 bundle: attrs, array_size(read_attr.ncounters, sizeof(u64)));
115 if (IS_ERR(ptr: read_attr.counters_buff))
116 return PTR_ERR(ptr: read_attr.counters_buff);
117
118 ret = counters->device->ops.read_counters(counters, &read_attr, attrs);
119 if (ret)
120 return ret;
121
122 return uverbs_copy_to(attrs_bundle: attrs, idx: UVERBS_ATTR_READ_COUNTERS_BUFF,
123 from: read_attr.counters_buff,
124 size: read_attr.ncounters * sizeof(u64));
125}
126
127DECLARE_UVERBS_NAMED_METHOD(
128 UVERBS_METHOD_COUNTERS_CREATE,
129 UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_COUNTERS_HANDLE,
130 UVERBS_OBJECT_COUNTERS,
131 UVERBS_ACCESS_NEW,
132 UA_MANDATORY));
133
134DECLARE_UVERBS_NAMED_METHOD_DESTROY(
135 UVERBS_METHOD_COUNTERS_DESTROY,
136 UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_COUNTERS_HANDLE,
137 UVERBS_OBJECT_COUNTERS,
138 UVERBS_ACCESS_DESTROY,
139 UA_MANDATORY));
140
141DECLARE_UVERBS_NAMED_METHOD(
142 UVERBS_METHOD_COUNTERS_READ,
143 UVERBS_ATTR_IDR(UVERBS_ATTR_READ_COUNTERS_HANDLE,
144 UVERBS_OBJECT_COUNTERS,
145 UVERBS_ACCESS_READ,
146 UA_MANDATORY),
147 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_READ_COUNTERS_BUFF,
148 UVERBS_ATTR_MIN_SIZE(0),
149 UA_MANDATORY),
150 UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_READ_COUNTERS_FLAGS,
151 enum ib_uverbs_read_counters_flags));
152
153DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_COUNTERS,
154 UVERBS_TYPE_ALLOC_IDR(uverbs_free_counters),
155 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_CREATE),
156 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY),
157 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_READ));
158
159const struct uapi_definition uverbs_def_obj_counters[] = {
160 UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_COUNTERS,
161 UAPI_DEF_OBJ_NEEDS_FN(destroy_counters)),
162 {}
163};
164

source code of linux/drivers/infiniband/core/uverbs_std_types_counters.c