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
uverbs_free_counters(struct ib_uobject * uobject,enum rdma_remove_reason why,struct uverbs_attr_bundle * attrs)38 static 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 ret = ib_destroy_usecnt(&counters->usecnt, why, uobject);
46 if (ret)
47 return ret;
48
49 ret = counters->device->ops.destroy_counters(counters);
50 if (ret)
51 return ret;
52 kfree(counters);
53 return 0;
54 }
55
UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)56 static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_CREATE)(
57 struct uverbs_attr_bundle *attrs)
58 {
59 struct ib_uobject *uobj = uverbs_attr_get_uobject(
60 attrs, UVERBS_ATTR_CREATE_COUNTERS_HANDLE);
61 struct ib_device *ib_dev = attrs->context->device;
62 struct ib_counters *counters;
63 int ret;
64
65 /*
66 * This check should be removed once the infrastructure
67 * have the ability to remove methods from parse tree once
68 * such condition is met.
69 */
70 if (!ib_dev->ops.create_counters)
71 return -EOPNOTSUPP;
72
73 counters = rdma_zalloc_drv_obj(ib_dev, ib_counters);
74 if (!counters)
75 return -ENOMEM;
76
77 counters->device = ib_dev;
78 counters->uobject = uobj;
79 uobj->object = counters;
80 atomic_set(&counters->usecnt, 0);
81
82 ret = ib_dev->ops.create_counters(counters, attrs);
83 if (ret)
84 kfree(counters);
85
86 return ret;
87 }
88
UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)89 static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(
90 struct uverbs_attr_bundle *attrs)
91 {
92 struct ib_counters_read_attr read_attr = {};
93 const struct uverbs_attr *uattr;
94 struct ib_counters *counters =
95 uverbs_attr_get_obj(attrs, UVERBS_ATTR_READ_COUNTERS_HANDLE);
96 int ret;
97
98 if (!counters->device->ops.read_counters)
99 return -EOPNOTSUPP;
100
101 if (!atomic_read(&counters->usecnt))
102 return -EINVAL;
103
104 ret = uverbs_get_flags32(&read_attr.flags, attrs,
105 UVERBS_ATTR_READ_COUNTERS_FLAGS,
106 IB_UVERBS_READ_COUNTERS_PREFER_CACHED);
107 if (ret)
108 return ret;
109
110 uattr = uverbs_attr_get(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF);
111 if (IS_ERR(uattr))
112 return PTR_ERR(uattr);
113 read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
114 read_attr.counters_buff = uverbs_zalloc(
115 attrs, array_size(read_attr.ncounters, sizeof(u64)));
116 if (IS_ERR(read_attr.counters_buff))
117 return PTR_ERR(read_attr.counters_buff);
118
119 ret = counters->device->ops.read_counters(counters, &read_attr, attrs);
120 if (ret)
121 return ret;
122
123 return uverbs_copy_to(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF,
124 read_attr.counters_buff,
125 read_attr.ncounters * sizeof(u64));
126 }
127
128 DECLARE_UVERBS_NAMED_METHOD(
129 UVERBS_METHOD_COUNTERS_CREATE,
130 UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_COUNTERS_HANDLE,
131 UVERBS_OBJECT_COUNTERS,
132 UVERBS_ACCESS_NEW,
133 UA_MANDATORY));
134
135 DECLARE_UVERBS_NAMED_METHOD_DESTROY(
136 UVERBS_METHOD_COUNTERS_DESTROY,
137 UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_COUNTERS_HANDLE,
138 UVERBS_OBJECT_COUNTERS,
139 UVERBS_ACCESS_DESTROY,
140 UA_MANDATORY));
141
142 DECLARE_UVERBS_NAMED_METHOD(
143 UVERBS_METHOD_COUNTERS_READ,
144 UVERBS_ATTR_IDR(UVERBS_ATTR_READ_COUNTERS_HANDLE,
145 UVERBS_OBJECT_COUNTERS,
146 UVERBS_ACCESS_READ,
147 UA_MANDATORY),
148 UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_READ_COUNTERS_BUFF,
149 UVERBS_ATTR_MIN_SIZE(0),
150 UA_MANDATORY),
151 UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_READ_COUNTERS_FLAGS,
152 enum ib_uverbs_read_counters_flags));
153
154 DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_COUNTERS,
155 UVERBS_TYPE_ALLOC_IDR(uverbs_free_counters),
156 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_CREATE),
157 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY),
158 &UVERBS_METHOD(UVERBS_METHOD_COUNTERS_READ));
159
160 const struct uapi_definition uverbs_def_obj_counters[] = {
161 UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_COUNTERS,
162 UAPI_DEF_OBJ_NEEDS_FN(destroy_counters)),
163 {}
164 };
165