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 
40 struct cma_device;
41 
42 struct cma_dev_group;
43 
44 struct cma_dev_port_group {
45 	u32			port_num;
46 	struct cma_dev_group	*cma_dev_group;
47 	struct config_group	group;
48 };
49 
50 struct 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 
57 static 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 
68 static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
69 {
70 	return !strcmp(dev_name(&ib_dev->dev), cookie);
71 }
72 
73 static 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_by_name,
84 					    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 
94 static void cma_configfs_params_put(struct cma_device *cma_dev)
95 {
96 	cma_dev_put(cma_dev);
97 }
98 
99 static 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, &cma_dev, &group);
108 	if (ret)
109 		return ret;
110 
111 	gid_type = cma_get_default_gid_type(cma_dev, 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, "%s\n", ib_cache_gid_type_str(gid_type));
118 }
119 
120 static 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, &cma_dev, &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(cma_dev, group->port_num, gid_type);
139 
140 	cma_configfs_params_put(cma_dev);
141 
142 	return !ret ? strnlen(buf, count) : ret;
143 }
144 
145 CONFIGFS_ATTR(, default_roce_mode);
146 
147 static 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, &cma_dev, &group);
155 	if (ret)
156 		return ret;
157 
158 	tos = cma_get_default_roce_tos(cma_dev, group->port_num);
159 	cma_configfs_params_put(cma_dev);
160 
161 	return sysfs_emit(buf, "%u\n", tos);
162 }
163 
164 static 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(buf, 0, &tos);
173 	if (ret)
174 		return ret;
175 
176 	ret = cma_configfs_params_get(item, &cma_dev, &group);
177 	if (ret)
178 		return ret;
179 
180 	ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
181 	cma_configfs_params_put(cma_dev);
182 
183 	return ret ? ret : strnlen(buf, count);
184 }
185 
186 CONFIGFS_ATTR(, default_roce_tos);
187 
188 static struct configfs_attribute *cma_configfs_attributes[] = {
189 	&attr_default_roce_mode,
190 	&attr_default_roce_tos,
191 	NULL,
192 };
193 
194 static const struct config_item_type cma_port_group_type = {
195 	.ct_attrs	= cma_configfs_attributes,
196 	.ct_owner	= THIS_MODULE
197 };
198 
199 static 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(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[10];
221 
222 		ports[i].port_num = i + 1;
223 		snprintf(port_str, sizeof(port_str), "%u", i + 1);
224 		ports[i].cma_dev_group = cma_dev_group;
225 		config_group_init_type_name(&ports[i].group,
226 					    port_str,
227 					    &cma_port_group_type);
228 		configfs_add_default_group(&ports[i].group,
229 				&cma_dev_group->ports_group);
230 
231 	}
232 	cma_dev_group->ports = ports;
233 	return 0;
234 }
235 
236 static 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(cma_dev_group);
245 };
246 
247 static 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(cma_dev_group->ports);
256 	cma_dev_group->ports = NULL;
257 };
258 
259 static struct configfs_item_operations cma_ports_item_ops = {
260 	.release = release_cma_ports_group
261 };
262 
263 static const struct config_item_type cma_ports_group_type = {
264 	.ct_item_ops	= &cma_ports_item_ops,
265 	.ct_owner	= THIS_MODULE
266 };
267 
268 static struct configfs_item_operations cma_device_item_ops = {
269 	.release = release_cma_dev
270 };
271 
272 static const struct config_item_type cma_device_group_type = {
273 	.ct_item_ops	= &cma_device_item_ops,
274 	.ct_owner	= THIS_MODULE
275 };
276 
277 static 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_by_name,
282 							       (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 	strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
296 
297 	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
298 				    &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(&cma_dev_group->device_group, name,
305 				    &cma_device_group_type);
306 	configfs_add_default_group(&cma_dev_group->ports_group,
307 			&cma_dev_group->device_group);
308 
309 	cma_dev_put(cma_dev);
310 	return &cma_dev_group->device_group;
311 
312 fail:
313 	if (cma_dev)
314 		cma_dev_put(cma_dev);
315 	kfree(cma_dev_group);
316 	return ERR_PTR(err);
317 }
318 
319 static 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(&cma_dev_group->ports_group);
327 	configfs_remove_default_groups(&cma_dev_group->device_group);
328 	config_item_put(item);
329 }
330 
331 static struct configfs_group_operations cma_subsys_group_ops = {
332 	.make_group	= make_cma_dev,
333 	.drop_item	= drop_cma_dev,
334 };
335 
336 static const struct config_item_type cma_subsys_type = {
337 	.ct_group_ops	= &cma_subsys_group_ops,
338 	.ct_owner	= THIS_MODULE,
339 };
340 
341 static 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 
350 int __init cma_configfs_init(void)
351 {
352 	int ret;
353 
354 	config_group_init(&cma_subsys.su_group);
355 	mutex_init(&cma_subsys.su_mutex);
356 	ret = configfs_register_subsystem(&cma_subsys);
357 	if (ret)
358 		mutex_destroy(&cma_subsys.su_mutex);
359 	return ret;
360 }
361 
362 void __exit cma_configfs_exit(void)
363 {
364 	configfs_unregister_subsystem(&cma_subsys);
365 	mutex_destroy(&cma_subsys.su_mutex);
366 }
367