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