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 
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 
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 
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 
95 static void cma_configfs_params_put(struct cma_device *cma_dev)
96 {
97 	cma_deref_dev(cma_dev);
98 }
99 
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 
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 = ib_cache_gid_parse_type_str(buf);
127 	ssize_t ret;
128 
129 	if (gid_type < 0)
130 		return -EINVAL;
131 
132 	ret = cma_configfs_params_get(item, &cma_dev, &group);
133 	if (ret)
134 		return ret;
135 
136 	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
137 
138 	cma_configfs_params_put(cma_dev);
139 
140 	return !ret ? strnlen(buf, count) : ret;
141 }
142 
143 CONFIGFS_ATTR(, default_roce_mode);
144 
145 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
146 {
147 	struct cma_device *cma_dev;
148 	struct cma_dev_port_group *group;
149 	ssize_t ret;
150 	u8 tos;
151 
152 	ret = cma_configfs_params_get(item, &cma_dev, &group);
153 	if (ret)
154 		return ret;
155 
156 	tos = cma_get_default_roce_tos(cma_dev, group->port_num);
157 	cma_configfs_params_put(cma_dev);
158 
159 	return sprintf(buf, "%u\n", tos);
160 }
161 
162 static ssize_t default_roce_tos_store(struct config_item *item,
163 				      const char *buf, size_t count)
164 {
165 	struct cma_device *cma_dev;
166 	struct cma_dev_port_group *group;
167 	ssize_t ret;
168 	u8 tos;
169 
170 	ret = kstrtou8(buf, 0, &tos);
171 	if (ret)
172 		return ret;
173 
174 	ret = cma_configfs_params_get(item, &cma_dev, &group);
175 	if (ret)
176 		return ret;
177 
178 	ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
179 	cma_configfs_params_put(cma_dev);
180 
181 	return ret ? ret : strnlen(buf, count);
182 }
183 
184 CONFIGFS_ATTR(, default_roce_tos);
185 
186 static struct configfs_attribute *cma_configfs_attributes[] = {
187 	&attr_default_roce_mode,
188 	&attr_default_roce_tos,
189 	NULL,
190 };
191 
192 static const struct config_item_type cma_port_group_type = {
193 	.ct_attrs	= cma_configfs_attributes,
194 	.ct_owner	= THIS_MODULE
195 };
196 
197 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
198 			  struct cma_device *cma_dev)
199 {
200 	struct ib_device *ibdev;
201 	unsigned int i;
202 	unsigned int ports_num;
203 	struct cma_dev_port_group *ports;
204 	int err;
205 
206 	ibdev = cma_get_ib_dev(cma_dev);
207 
208 	if (!ibdev)
209 		return -ENODEV;
210 
211 	ports_num = ibdev->phys_port_cnt;
212 	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
213 			GFP_KERNEL);
214 
215 	if (!ports) {
216 		err = -ENOMEM;
217 		goto free;
218 	}
219 
220 	for (i = 0; i < ports_num; i++) {
221 		char port_str[10];
222 
223 		ports[i].port_num = i + 1;
224 		snprintf(port_str, sizeof(port_str), "%u", i + 1);
225 		ports[i].cma_dev_group = cma_dev_group;
226 		config_group_init_type_name(&ports[i].group,
227 					    port_str,
228 					    &cma_port_group_type);
229 		configfs_add_default_group(&ports[i].group,
230 				&cma_dev_group->ports_group);
231 
232 	}
233 	cma_dev_group->ports = ports;
234 
235 	return 0;
236 free:
237 	kfree(ports);
238 	cma_dev_group->ports = NULL;
239 	return err;
240 }
241 
242 static void release_cma_dev(struct config_item  *item)
243 {
244 	struct config_group *group = container_of(item, struct config_group,
245 						  cg_item);
246 	struct cma_dev_group *cma_dev_group = container_of(group,
247 							   struct cma_dev_group,
248 							   device_group);
249 
250 	kfree(cma_dev_group);
251 };
252 
253 static void release_cma_ports_group(struct config_item  *item)
254 {
255 	struct config_group *group = container_of(item, struct config_group,
256 						  cg_item);
257 	struct cma_dev_group *cma_dev_group = container_of(group,
258 							   struct cma_dev_group,
259 							   ports_group);
260 
261 	kfree(cma_dev_group->ports);
262 	cma_dev_group->ports = NULL;
263 };
264 
265 static struct configfs_item_operations cma_ports_item_ops = {
266 	.release = release_cma_ports_group
267 };
268 
269 static const struct config_item_type cma_ports_group_type = {
270 	.ct_item_ops	= &cma_ports_item_ops,
271 	.ct_owner	= THIS_MODULE
272 };
273 
274 static struct configfs_item_operations cma_device_item_ops = {
275 	.release = release_cma_dev
276 };
277 
278 static const struct config_item_type cma_device_group_type = {
279 	.ct_item_ops	= &cma_device_item_ops,
280 	.ct_owner	= THIS_MODULE
281 };
282 
283 static struct config_group *make_cma_dev(struct config_group *group,
284 					 const char *name)
285 {
286 	int err = -ENODEV;
287 	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
288 							       (void *)name);
289 	struct cma_dev_group *cma_dev_group = NULL;
290 
291 	if (!cma_dev)
292 		goto fail;
293 
294 	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
295 
296 	if (!cma_dev_group) {
297 		err = -ENOMEM;
298 		goto fail;
299 	}
300 
301 	strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
302 
303 	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
304 				    &cma_ports_group_type);
305 
306 	err = make_cma_ports(cma_dev_group, cma_dev);
307 	if (err)
308 		goto fail;
309 
310 	config_group_init_type_name(&cma_dev_group->device_group, name,
311 				    &cma_device_group_type);
312 	configfs_add_default_group(&cma_dev_group->ports_group,
313 			&cma_dev_group->device_group);
314 
315 	cma_deref_dev(cma_dev);
316 	return &cma_dev_group->device_group;
317 
318 fail:
319 	if (cma_dev)
320 		cma_deref_dev(cma_dev);
321 	kfree(cma_dev_group);
322 	return ERR_PTR(err);
323 }
324 
325 static struct configfs_group_operations cma_subsys_group_ops = {
326 	.make_group	= make_cma_dev,
327 };
328 
329 static const struct config_item_type cma_subsys_type = {
330 	.ct_group_ops	= &cma_subsys_group_ops,
331 	.ct_owner	= THIS_MODULE,
332 };
333 
334 static struct configfs_subsystem cma_subsys = {
335 	.su_group	= {
336 		.cg_item	= {
337 			.ci_namebuf	= "rdma_cm",
338 			.ci_type	= &cma_subsys_type,
339 		},
340 	},
341 };
342 
343 int __init cma_configfs_init(void)
344 {
345 	config_group_init(&cma_subsys.su_group);
346 	mutex_init(&cma_subsys.su_mutex);
347 	return configfs_register_subsystem(&cma_subsys);
348 }
349 
350 void __exit cma_configfs_exit(void)
351 {
352 	configfs_unregister_subsystem(&cma_subsys);
353 }
354