1/*
2 * Copyright (c) 2015, Mellanox Technologies inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/configfs.h>
34#include <rdma/ib_verbs.h>
35#include <rdma/rdma_cm.h>
36
37#include "core_priv.h"
38#include "cma_priv.h"
39
40struct cma_device;
41
42struct cma_dev_group;
43
44struct cma_dev_port_group {
45 u32 port_num;
46 struct cma_dev_group *cma_dev_group;
47 struct config_group group;
48};
49
50struct cma_dev_group {
51 char name[IB_DEVICE_NAME_MAX];
52 struct config_group device_group;
53 struct config_group ports_group;
54 struct cma_dev_port_group *ports;
55};
56
57static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
58{
59 struct config_group *group;
60
61 if (!item)
62 return NULL;
63
64 group = container_of(item, struct config_group, cg_item);
65 return container_of(group, struct cma_dev_port_group, group);
66}
67
68static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
69{
70 return !strcmp(dev_name(dev: &ib_dev->dev), cookie);
71}
72
73static int cma_configfs_params_get(struct config_item *item,
74 struct cma_device **pcma_dev,
75 struct cma_dev_port_group **pgroup)
76{
77 struct cma_dev_port_group *group = to_dev_port_group(item);
78 struct cma_device *cma_dev;
79
80 if (!group)
81 return -ENODEV;
82
83 cma_dev = cma_enum_devices_by_ibdev(filter: filter_by_name,
84 cookie: group->cma_dev_group->name);
85 if (!cma_dev)
86 return -ENODEV;
87
88 *pcma_dev = cma_dev;
89 *pgroup = group;
90
91 return 0;
92}
93
94static void cma_configfs_params_put(struct cma_device *cma_dev)
95{
96 cma_dev_put(dev: cma_dev);
97}
98
99static ssize_t default_roce_mode_show(struct config_item *item,
100 char *buf)
101{
102 struct cma_device *cma_dev;
103 struct cma_dev_port_group *group;
104 int gid_type;
105 ssize_t ret;
106
107 ret = cma_configfs_params_get(item, pcma_dev: &cma_dev, pgroup: &group);
108 if (ret)
109 return ret;
110
111 gid_type = cma_get_default_gid_type(dev: cma_dev, port: group->port_num);
112 cma_configfs_params_put(cma_dev);
113
114 if (gid_type < 0)
115 return gid_type;
116
117 return sysfs_emit(buf, fmt: "%s\n", ib_cache_gid_type_str(gid_type));
118}
119
120static ssize_t default_roce_mode_store(struct config_item *item,
121 const char *buf, size_t count)
122{
123 struct cma_device *cma_dev;
124 struct cma_dev_port_group *group;
125 int gid_type;
126 ssize_t ret;
127
128 ret = cma_configfs_params_get(item, pcma_dev: &cma_dev, pgroup: &group);
129 if (ret)
130 return ret;
131
132 gid_type = ib_cache_gid_parse_type_str(buf);
133 if (gid_type < 0) {
134 cma_configfs_params_put(cma_dev);
135 return -EINVAL;
136 }
137
138 ret = cma_set_default_gid_type(dev: cma_dev, port: group->port_num, default_gid_type: gid_type);
139
140 cma_configfs_params_put(cma_dev);
141
142 return !ret ? strnlen(p: buf, maxlen: count) : ret;
143}
144
145CONFIGFS_ATTR(, default_roce_mode);
146
147static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
148{
149 struct cma_device *cma_dev;
150 struct cma_dev_port_group *group;
151 ssize_t ret;
152 u8 tos;
153
154 ret = cma_configfs_params_get(item, pcma_dev: &cma_dev, pgroup: &group);
155 if (ret)
156 return ret;
157
158 tos = cma_get_default_roce_tos(dev: cma_dev, port: group->port_num);
159 cma_configfs_params_put(cma_dev);
160
161 return sysfs_emit(buf, fmt: "%u\n", tos);
162}
163
164static ssize_t default_roce_tos_store(struct config_item *item,
165 const char *buf, size_t count)
166{
167 struct cma_device *cma_dev;
168 struct cma_dev_port_group *group;
169 ssize_t ret;
170 u8 tos;
171
172 ret = kstrtou8(s: buf, base: 0, res: &tos);
173 if (ret)
174 return ret;
175
176 ret = cma_configfs_params_get(item, pcma_dev: &cma_dev, pgroup: &group);
177 if (ret)
178 return ret;
179
180 ret = cma_set_default_roce_tos(dev: cma_dev, port: group->port_num, default_roce_tos: tos);
181 cma_configfs_params_put(cma_dev);
182
183 return ret ? ret : strnlen(p: buf, maxlen: count);
184}
185
186CONFIGFS_ATTR(, default_roce_tos);
187
188static struct configfs_attribute *cma_configfs_attributes[] = {
189 &attr_default_roce_mode,
190 &attr_default_roce_tos,
191 NULL,
192};
193
194static const struct config_item_type cma_port_group_type = {
195 .ct_attrs = cma_configfs_attributes,
196 .ct_owner = THIS_MODULE
197};
198
199static int make_cma_ports(struct cma_dev_group *cma_dev_group,
200 struct cma_device *cma_dev)
201{
202 struct cma_dev_port_group *ports;
203 struct ib_device *ibdev;
204 u32 ports_num;
205 u32 i;
206
207 ibdev = cma_get_ib_dev(dev: cma_dev);
208
209 if (!ibdev)
210 return -ENODEV;
211
212 ports_num = ibdev->phys_port_cnt;
213 ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
214 GFP_KERNEL);
215
216 if (!ports)
217 return -ENOMEM;
218
219 for (i = 0; i < ports_num; i++) {
220 char port_str[11];
221
222 ports[i].port_num = i + 1;
223 snprintf(buf: port_str, size: sizeof(port_str), fmt: "%u", i + 1);
224 ports[i].cma_dev_group = cma_dev_group;
225 config_group_init_type_name(group: &ports[i].group,
226 name: port_str,
227 type: &cma_port_group_type);
228 configfs_add_default_group(new_group: &ports[i].group,
229 group: &cma_dev_group->ports_group);
230
231 }
232 cma_dev_group->ports = ports;
233 return 0;
234}
235
236static void release_cma_dev(struct config_item *item)
237{
238 struct config_group *group = container_of(item, struct config_group,
239 cg_item);
240 struct cma_dev_group *cma_dev_group = container_of(group,
241 struct cma_dev_group,
242 device_group);
243
244 kfree(objp: cma_dev_group);
245};
246
247static void release_cma_ports_group(struct config_item *item)
248{
249 struct config_group *group = container_of(item, struct config_group,
250 cg_item);
251 struct cma_dev_group *cma_dev_group = container_of(group,
252 struct cma_dev_group,
253 ports_group);
254
255 kfree(objp: cma_dev_group->ports);
256 cma_dev_group->ports = NULL;
257};
258
259static struct configfs_item_operations cma_ports_item_ops = {
260 .release = release_cma_ports_group
261};
262
263static const struct config_item_type cma_ports_group_type = {
264 .ct_item_ops = &cma_ports_item_ops,
265 .ct_owner = THIS_MODULE
266};
267
268static struct configfs_item_operations cma_device_item_ops = {
269 .release = release_cma_dev
270};
271
272static const struct config_item_type cma_device_group_type = {
273 .ct_item_ops = &cma_device_item_ops,
274 .ct_owner = THIS_MODULE
275};
276
277static struct config_group *make_cma_dev(struct config_group *group,
278 const char *name)
279{
280 int err = -ENODEV;
281 struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter: filter_by_name,
282 cookie: (void *)name);
283 struct cma_dev_group *cma_dev_group = NULL;
284
285 if (!cma_dev)
286 goto fail;
287
288 cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
289
290 if (!cma_dev_group) {
291 err = -ENOMEM;
292 goto fail;
293 }
294
295 strscpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
296
297 config_group_init_type_name(group: &cma_dev_group->ports_group, name: "ports",
298 type: &cma_ports_group_type);
299
300 err = make_cma_ports(cma_dev_group, cma_dev);
301 if (err)
302 goto fail;
303
304 config_group_init_type_name(group: &cma_dev_group->device_group, name,
305 type: &cma_device_group_type);
306 configfs_add_default_group(new_group: &cma_dev_group->ports_group,
307 group: &cma_dev_group->device_group);
308
309 cma_dev_put(dev: cma_dev);
310 return &cma_dev_group->device_group;
311
312fail:
313 if (cma_dev)
314 cma_dev_put(dev: cma_dev);
315 kfree(objp: cma_dev_group);
316 return ERR_PTR(error: err);
317}
318
319static void drop_cma_dev(struct config_group *cgroup, struct config_item *item)
320{
321 struct config_group *group =
322 container_of(item, struct config_group, cg_item);
323 struct cma_dev_group *cma_dev_group =
324 container_of(group, struct cma_dev_group, device_group);
325
326 configfs_remove_default_groups(group: &cma_dev_group->ports_group);
327 configfs_remove_default_groups(group: &cma_dev_group->device_group);
328 config_item_put(item);
329}
330
331static struct configfs_group_operations cma_subsys_group_ops = {
332 .make_group = make_cma_dev,
333 .drop_item = drop_cma_dev,
334};
335
336static const struct config_item_type cma_subsys_type = {
337 .ct_group_ops = &cma_subsys_group_ops,
338 .ct_owner = THIS_MODULE,
339};
340
341static struct configfs_subsystem cma_subsys = {
342 .su_group = {
343 .cg_item = {
344 .ci_namebuf = "rdma_cm",
345 .ci_type = &cma_subsys_type,
346 },
347 },
348};
349
350int __init cma_configfs_init(void)
351{
352 int ret;
353
354 config_group_init(group: &cma_subsys.su_group);
355 mutex_init(&cma_subsys.su_mutex);
356 ret = configfs_register_subsystem(subsys: &cma_subsys);
357 if (ret)
358 mutex_destroy(lock: &cma_subsys.su_mutex);
359 return ret;
360}
361
362void __exit cma_configfs_exit(void)
363{
364 configfs_unregister_subsystem(subsys: &cma_subsys);
365 mutex_destroy(lock: &cma_subsys.su_mutex);
366}
367

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