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/module.h>
34 #include <linux/configfs.h>
35 #include <rdma/ib_verbs.h>
36 #include <rdma/rdma_cm.h>
37
38 #include "core_priv.h"
39 #include "cma_priv.h"
40
41 struct cma_device;
42
43 struct cma_dev_group;
44
45 struct cma_dev_port_group {
46 unsigned int port_num;
47 struct cma_dev_group *cma_dev_group;
48 struct config_group group;
49 };
50
51 struct cma_dev_group {
52 char name[IB_DEVICE_NAME_MAX];
53 struct config_group device_group;
54 struct config_group ports_group;
55 struct cma_dev_port_group *ports;
56 };
57
to_dev_port_group(struct config_item * item)58 static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
59 {
60 struct config_group *group;
61
62 if (!item)
63 return NULL;
64
65 group = container_of(item, struct config_group, cg_item);
66 return container_of(group, struct cma_dev_port_group, group);
67 }
68
filter_by_name(struct ib_device * ib_dev,void * cookie)69 static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
70 {
71 return !strcmp(dev_name(&ib_dev->dev), cookie);
72 }
73
cma_configfs_params_get(struct config_item * item,struct cma_device ** pcma_dev,struct cma_dev_port_group ** pgroup)74 static int cma_configfs_params_get(struct config_item *item,
75 struct cma_device **pcma_dev,
76 struct cma_dev_port_group **pgroup)
77 {
78 struct cma_dev_port_group *group = to_dev_port_group(item);
79 struct cma_device *cma_dev;
80
81 if (!group)
82 return -ENODEV;
83
84 cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
85 group->cma_dev_group->name);
86 if (!cma_dev)
87 return -ENODEV;
88
89 *pcma_dev = cma_dev;
90 *pgroup = group;
91
92 return 0;
93 }
94
cma_configfs_params_put(struct cma_device * cma_dev)95 static void cma_configfs_params_put(struct cma_device *cma_dev)
96 {
97 cma_dev_put(cma_dev);
98 }
99
default_roce_mode_show(struct config_item * item,char * buf)100 static ssize_t default_roce_mode_show(struct config_item *item,
101 char *buf)
102 {
103 struct cma_device *cma_dev;
104 struct cma_dev_port_group *group;
105 int gid_type;
106 ssize_t ret;
107
108 ret = cma_configfs_params_get(item, &cma_dev, &group);
109 if (ret)
110 return ret;
111
112 gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
113 cma_configfs_params_put(cma_dev);
114
115 if (gid_type < 0)
116 return gid_type;
117
118 return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
119 }
120
default_roce_mode_store(struct config_item * item,const char * buf,size_t count)121 static ssize_t default_roce_mode_store(struct config_item *item,
122 const char *buf, size_t count)
123 {
124 struct cma_device *cma_dev;
125 struct cma_dev_port_group *group;
126 int gid_type;
127 ssize_t ret;
128
129 ret = cma_configfs_params_get(item, &cma_dev, &group);
130 if (ret)
131 return ret;
132
133 gid_type = ib_cache_gid_parse_type_str(buf);
134 if (gid_type < 0) {
135 cma_configfs_params_put(cma_dev);
136 return -EINVAL;
137 }
138
139 ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
140
141 cma_configfs_params_put(cma_dev);
142
143 return !ret ? strnlen(buf, count) : ret;
144 }
145
146 CONFIGFS_ATTR(, default_roce_mode);
147
default_roce_tos_show(struct config_item * item,char * buf)148 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
149 {
150 struct cma_device *cma_dev;
151 struct cma_dev_port_group *group;
152 ssize_t ret;
153 u8 tos;
154
155 ret = cma_configfs_params_get(item, &cma_dev, &group);
156 if (ret)
157 return ret;
158
159 tos = cma_get_default_roce_tos(cma_dev, group->port_num);
160 cma_configfs_params_put(cma_dev);
161
162 return sprintf(buf, "%u\n", tos);
163 }
164
default_roce_tos_store(struct config_item * item,const char * buf,size_t count)165 static ssize_t default_roce_tos_store(struct config_item *item,
166 const char *buf, size_t count)
167 {
168 struct cma_device *cma_dev;
169 struct cma_dev_port_group *group;
170 ssize_t ret;
171 u8 tos;
172
173 ret = kstrtou8(buf, 0, &tos);
174 if (ret)
175 return ret;
176
177 ret = cma_configfs_params_get(item, &cma_dev, &group);
178 if (ret)
179 return ret;
180
181 ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
182 cma_configfs_params_put(cma_dev);
183
184 return ret ? ret : strnlen(buf, count);
185 }
186
187 CONFIGFS_ATTR(, default_roce_tos);
188
189 static struct configfs_attribute *cma_configfs_attributes[] = {
190 &attr_default_roce_mode,
191 &attr_default_roce_tos,
192 NULL,
193 };
194
195 static const struct config_item_type cma_port_group_type = {
196 .ct_attrs = cma_configfs_attributes,
197 .ct_owner = THIS_MODULE
198 };
199
make_cma_ports(struct cma_dev_group * cma_dev_group,struct cma_device * cma_dev)200 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
201 struct cma_device *cma_dev)
202 {
203 struct ib_device *ibdev;
204 unsigned int i;
205 unsigned int ports_num;
206 struct cma_dev_port_group *ports;
207 int err;
208
209 ibdev = cma_get_ib_dev(cma_dev);
210
211 if (!ibdev)
212 return -ENODEV;
213
214 ports_num = ibdev->phys_port_cnt;
215 ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
216 GFP_KERNEL);
217
218 if (!ports) {
219 err = -ENOMEM;
220 goto free;
221 }
222
223 for (i = 0; i < ports_num; i++) {
224 char port_str[10];
225
226 ports[i].port_num = i + 1;
227 snprintf(port_str, sizeof(port_str), "%u", i + 1);
228 ports[i].cma_dev_group = cma_dev_group;
229 config_group_init_type_name(&ports[i].group,
230 port_str,
231 &cma_port_group_type);
232 configfs_add_default_group(&ports[i].group,
233 &cma_dev_group->ports_group);
234
235 }
236 cma_dev_group->ports = ports;
237
238 return 0;
239 free:
240 kfree(ports);
241 cma_dev_group->ports = NULL;
242 return err;
243 }
244
release_cma_dev(struct config_item * item)245 static void release_cma_dev(struct config_item *item)
246 {
247 struct config_group *group = container_of(item, struct config_group,
248 cg_item);
249 struct cma_dev_group *cma_dev_group = container_of(group,
250 struct cma_dev_group,
251 device_group);
252
253 kfree(cma_dev_group);
254 };
255
release_cma_ports_group(struct config_item * item)256 static void release_cma_ports_group(struct config_item *item)
257 {
258 struct config_group *group = container_of(item, struct config_group,
259 cg_item);
260 struct cma_dev_group *cma_dev_group = container_of(group,
261 struct cma_dev_group,
262 ports_group);
263
264 kfree(cma_dev_group->ports);
265 cma_dev_group->ports = NULL;
266 };
267
268 static struct configfs_item_operations cma_ports_item_ops = {
269 .release = release_cma_ports_group
270 };
271
272 static const struct config_item_type cma_ports_group_type = {
273 .ct_item_ops = &cma_ports_item_ops,
274 .ct_owner = THIS_MODULE
275 };
276
277 static struct configfs_item_operations cma_device_item_ops = {
278 .release = release_cma_dev
279 };
280
281 static const struct config_item_type cma_device_group_type = {
282 .ct_item_ops = &cma_device_item_ops,
283 .ct_owner = THIS_MODULE
284 };
285
make_cma_dev(struct config_group * group,const char * name)286 static struct config_group *make_cma_dev(struct config_group *group,
287 const char *name)
288 {
289 int err = -ENODEV;
290 struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
291 (void *)name);
292 struct cma_dev_group *cma_dev_group = NULL;
293
294 if (!cma_dev)
295 goto fail;
296
297 cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
298
299 if (!cma_dev_group) {
300 err = -ENOMEM;
301 goto fail;
302 }
303
304 strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
305
306 config_group_init_type_name(&cma_dev_group->ports_group, "ports",
307 &cma_ports_group_type);
308
309 err = make_cma_ports(cma_dev_group, cma_dev);
310 if (err)
311 goto fail;
312
313 config_group_init_type_name(&cma_dev_group->device_group, name,
314 &cma_device_group_type);
315 configfs_add_default_group(&cma_dev_group->ports_group,
316 &cma_dev_group->device_group);
317
318 cma_dev_put(cma_dev);
319 return &cma_dev_group->device_group;
320
321 fail:
322 if (cma_dev)
323 cma_dev_put(cma_dev);
324 kfree(cma_dev_group);
325 return ERR_PTR(err);
326 }
327
drop_cma_dev(struct config_group * cgroup,struct config_item * item)328 static void drop_cma_dev(struct config_group *cgroup, struct config_item *item)
329 {
330 struct config_group *group =
331 container_of(item, struct config_group, cg_item);
332 struct cma_dev_group *cma_dev_group =
333 container_of(group, struct cma_dev_group, device_group);
334
335 configfs_remove_default_groups(&cma_dev_group->ports_group);
336 configfs_remove_default_groups(&cma_dev_group->device_group);
337 config_item_put(item);
338 }
339
340 static struct configfs_group_operations cma_subsys_group_ops = {
341 .make_group = make_cma_dev,
342 .drop_item = drop_cma_dev,
343 };
344
345 static const struct config_item_type cma_subsys_type = {
346 .ct_group_ops = &cma_subsys_group_ops,
347 .ct_owner = THIS_MODULE,
348 };
349
350 static struct configfs_subsystem cma_subsys = {
351 .su_group = {
352 .cg_item = {
353 .ci_namebuf = "rdma_cm",
354 .ci_type = &cma_subsys_type,
355 },
356 },
357 };
358
cma_configfs_init(void)359 int __init cma_configfs_init(void)
360 {
361 int ret;
362
363 config_group_init(&cma_subsys.su_group);
364 mutex_init(&cma_subsys.su_mutex);
365 ret = configfs_register_subsystem(&cma_subsys);
366 if (ret)
367 mutex_destroy(&cma_subsys.su_mutex);
368 return ret;
369 }
370
cma_configfs_exit(void)371 void __exit cma_configfs_exit(void)
372 {
373 configfs_unregister_subsystem(&cma_subsys);
374 mutex_destroy(&cma_subsys.su_mutex);
375 }
376