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1 // SPDX-License-Identifier: GPL-2.0-or-later

2 /*

3 * RDMA Transport Layer

4 *

8 */

9 #undef pr_fmt

10 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt

12 #include "rtrs-pri.h"

13 #include "rtrs-srv.h"

14 #include "rtrs-log.h"

16 static void rtrs_srv_release(struct kobject *kobj)

17 {

18 struct rtrs_srv_path *srv_path;

20 srv_path = container_of(kobj, struct rtrs_srv_path, kobj);

21 kfree(srv_path);

22 }

24 static struct kobj_type ktype = {

25 .sysfs_ops = &kobj_sysfs_ops,

26 .release = rtrs_srv_release,

27 };

29 static ssize_t rtrs_srv_disconnect_show(struct kobject *kobj,

30 struct kobj_attribute *attr, char *buf)

31 {

32 return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name);

33 }

35 static ssize_t rtrs_srv_disconnect_store(struct kobject *kobj,

36 struct kobj_attribute *attr,

37 const char *buf, size_t count)

38 {

39 struct rtrs_srv_path *srv_path;

40 struct rtrs_path *s;

41 char str[MAXHOSTNAMELEN];

43 srv_path = container_of(kobj, struct rtrs_srv_path, kobj);

44 s = &srv_path->s;

45 if (!sysfs_streq(buf, "1")) {

46 rtrs_err(s, "%s: invalid value: '%s'\n",

47 attr->attr.name, buf);

48 return -EINVAL;

49 }

51 sockaddr_to_str((struct sockaddr *)&srv_path->s.dst_addr, str,

52 sizeof(str));

54 rtrs_info(s, "disconnect for path %s requested\n", str);

55 /* first remove sysfs itself to avoid deadlock */

56 sysfs_remove_file_self(&srv_path->kobj, &attr->attr);

57 close_path(srv_path);

59 return count;

60 }

62 static struct kobj_attribute rtrs_srv_disconnect_attr =

63 __ATTR(disconnect, 0644,

64 rtrs_srv_disconnect_show, rtrs_srv_disconnect_store);

66 static ssize_t rtrs_srv_hca_port_show(struct kobject *kobj,

67 struct kobj_attribute *attr,

68 char *page)

69 {

70 struct rtrs_srv_path *srv_path;

71 struct rtrs_con *usr_con;

73 srv_path = container_of(kobj, typeof(*srv_path), kobj);

74 usr_con = srv_path->s.con[0];

76 return sysfs_emit(page, "%u\n", usr_con->cm_id->port_num);

77 }

79 static struct kobj_attribute rtrs_srv_hca_port_attr =

80 __ATTR(hca_port, 0444, rtrs_srv_hca_port_show, NULL);

82 static ssize_t rtrs_srv_hca_name_show(struct kobject *kobj,

83 struct kobj_attribute *attr,

84 char *page)

85 {

86 struct rtrs_srv_path *srv_path;

88 srv_path = container_of(kobj, struct rtrs_srv_path, kobj);

90 return sysfs_emit(page, "%s\n", srv_path->s.dev->ib_dev->name);

91 }

93 static struct kobj_attribute rtrs_srv_hca_name_attr =

94 __ATTR(hca_name, 0444, rtrs_srv_hca_name_show, NULL);

96 static ssize_t rtrs_srv_src_addr_show(struct kobject *kobj,

97 struct kobj_attribute *attr,

98 char *page)

99 {

100 struct rtrs_srv_path *srv_path;

101 int cnt;

102

103 srv_path = container_of(kobj, struct rtrs_srv_path, kobj);

104 cnt = sockaddr_to_str((struct sockaddr *)&srv_path->s.dst_addr,

105 page, PAGE_SIZE);

106 return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n");

107 }

108

109 static struct kobj_attribute rtrs_srv_src_addr_attr =

110 __ATTR(src_addr, 0444, rtrs_srv_src_addr_show, NULL);

111

112 static ssize_t rtrs_srv_dst_addr_show(struct kobject *kobj,

113 struct kobj_attribute *attr,

114 char *page)

115 {

116 struct rtrs_srv_path *srv_path;

117 int len;

118

119 srv_path = container_of(kobj, struct rtrs_srv_path, kobj);

120 len = sockaddr_to_str((struct sockaddr *)&srv_path->s.src_addr, page,

121 PAGE_SIZE);

122 len += sysfs_emit_at(page, len, "\n");

123 return len;

124 }

125

126 static struct kobj_attribute rtrs_srv_dst_addr_attr =

127 __ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL);

128

129 static struct attribute *rtrs_srv_path_attrs[] = {

130 &rtrs_srv_hca_name_attr.attr,

131 &rtrs_srv_hca_port_attr.attr,

132 &rtrs_srv_src_addr_attr.attr,

133 &rtrs_srv_dst_addr_attr.attr,

134 &rtrs_srv_disconnect_attr.attr,

135 NULL,

136 };

137

138 static const struct attribute_group rtrs_srv_path_attr_group = {

139 .attrs = rtrs_srv_path_attrs,

140 };

141

142 STAT_ATTR(struct rtrs_srv_stats, rdma,

143 rtrs_srv_stats_rdma_to_str,

144 rtrs_srv_reset_rdma_stats);

145

146 static struct attribute *rtrs_srv_stats_attrs[] = {

147 &rdma_attr.attr,

148 NULL,

149 };

150

151 static const struct attribute_group rtrs_srv_stats_attr_group = {

152 .attrs = rtrs_srv_stats_attrs,

153 };

154

155 static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)

156 {

157 struct rtrs_srv *srv = srv_path->srv;

158 int err = 0;

159

160 mutex_lock(&srv->paths_mutex);

161 if (srv->dev_ref++) {

162 /*

163 * Device needs to be registered only on the first session

164 */

165 goto unlock;

166 }

167 srv->dev.class = rtrs_dev_class;

168 err = dev_set_name(&srv->dev, "%s", srv_path->s.sessname);

169 if (err)

170 goto unlock;

171

172 /*

173 * Suppress user space notification until

174 * sysfs files are created

175 */

176 dev_set_uevent_suppress(&srv->dev, true);

177 err = device_add(&srv->dev);

178 if (err) {

179 pr_err("device_add(): %d\n", err);

180 put_device(&srv->dev);

181 goto unlock;

182 }

183 srv->kobj_paths = kobject_create_and_add("paths", &srv->dev.kobj);

184 if (!srv->kobj_paths) {

185 err = -ENOMEM;

186 pr_err("kobject_create_and_add(): %d\n", err);

187 device_del(&srv->dev);

188 put_device(&srv->dev);

189 goto unlock;

190 }

191 dev_set_uevent_suppress(&srv->dev, false);

192 kobject_uevent(&srv->dev.kobj, KOBJ_ADD);

193 unlock:

194 mutex_unlock(&srv->paths_mutex);

195

196 return err;

197 }

198

199 static void

200 rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_path *srv_path)

201 {

202 struct rtrs_srv *srv = srv_path->srv;

203

204 mutex_lock(&srv->paths_mutex);

205 if (!--srv->dev_ref) {

206 kobject_del(srv->kobj_paths);

207 kobject_put(srv->kobj_paths);

208 mutex_unlock(&srv->paths_mutex);

209 device_del(&srv->dev);

210 put_device(&srv->dev);

211 } else {

212 put_device(&srv->dev);

213 mutex_unlock(&srv->paths_mutex);

214 }

215 }

216

217 static void rtrs_srv_path_stats_release(struct kobject *kobj)

218 {

219 struct rtrs_srv_stats *stats;

220

221 stats = container_of(kobj, struct rtrs_srv_stats, kobj_stats);

222

223 kfree(stats);

224 }

225

226 static struct kobj_type ktype_stats = {

227 .sysfs_ops = &kobj_sysfs_ops,

228 .release = rtrs_srv_path_stats_release,

229 };

230

231 static int rtrs_srv_create_stats_files(struct rtrs_srv_path *srv_path)

232 {

233 int err;

234 struct rtrs_path *s = &srv_path->s;

235

236 err = kobject_init_and_add(&srv_path->stats->kobj_stats, &ktype_stats,

237 &srv_path->kobj, "stats");

238 if (err) {

239 rtrs_err(s, "kobject_init_and_add(): %d\n", err);

240 kobject_put(&srv_path->stats->kobj_stats);

241 return err;

242 }

243 err = sysfs_create_group(&srv_path->stats->kobj_stats,

244 &rtrs_srv_stats_attr_group);

245 if (err) {

246 rtrs_err(s, "sysfs_create_group(): %d\n", err);

247 goto err;

248 }

249

250 return 0;

251

252 err:

253 kobject_del(&srv_path->stats->kobj_stats);

254 kobject_put(&srv_path->stats->kobj_stats);

255

256 return err;

257 }

258

259 int rtrs_srv_create_path_files(struct rtrs_srv_path *srv_path)

260 {

261 struct rtrs_srv *srv = srv_path->srv;

262 struct rtrs_path *s = &srv_path->s;

263 char str[NAME_MAX];

264 int err;

265 struct rtrs_addr path = {

266 .src = &srv_path->s.dst_addr,

267 .dst = &srv_path->s.src_addr,

268 };

269

270 rtrs_addr_to_str(&path, str, sizeof(str));

271 err = rtrs_srv_create_once_sysfs_root_folders(srv_path);

272 if (err)

273 return err;

274

275 err = kobject_init_and_add(&srv_path->kobj, &ktype, srv->kobj_paths,

276 "%s", str);

277 if (err) {

278 rtrs_err(s, "kobject_init_and_add(): %d\n", err);

279 goto destroy_root;

280 }

281 err = sysfs_create_group(&srv_path->kobj, &rtrs_srv_path_attr_group);

282 if (err) {

283 rtrs_err(s, "sysfs_create_group(): %d\n", err);

284 goto put_kobj;

285 }

286 err = rtrs_srv_create_stats_files(srv_path);

287 if (err)

288 goto remove_group;

289

290 return 0;

291

292 remove_group:

293 sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);

294 put_kobj:

295 kobject_del(&srv_path->kobj);

296 destroy_root:

297 kobject_put(&srv_path->kobj);

298 rtrs_srv_destroy_once_sysfs_root_folders(srv_path);

299

300 return err;

301 }

302

303 void rtrs_srv_destroy_path_files(struct rtrs_srv_path *srv_path)

304 {

305 if (srv_path->kobj.state_in_sysfs) {

306 kobject_del(&srv_path->stats->kobj_stats);

307 kobject_put(&srv_path->stats->kobj_stats);

308 sysfs_remove_group(&srv_path->kobj, &rtrs_srv_path_attr_group);

309 kobject_put(&srv_path->kobj);

310

311 rtrs_srv_destroy_once_sysfs_root_folders(srv_path);

312 }

313 }