1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RDMA Transport Layer 4 * 5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. 6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. 7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. 8 */ 9 #undef pr_fmt 10 #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt 11 12 #include "rtrs-pri.h" 13 #include "rtrs-srv.h" 14 #include "rtrs-log.h" 15 16 static void rtrs_srv_release(struct kobject *kobj) 17 { 18 struct rtrs_srv_sess *sess; 19 20 sess = container_of(kobj, struct rtrs_srv_sess, kobj); 21 kfree(sess); 22 } 23 24 static struct kobj_type ktype = { 25 .sysfs_ops = &kobj_sysfs_ops, 26 .release = rtrs_srv_release, 27 }; 28 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 } 34 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_sess *sess; 40 struct rtrs_sess *s; 41 char str[MAXHOSTNAMELEN]; 42 43 sess = container_of(kobj, struct rtrs_srv_sess, kobj); 44 s = &sess->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 } 50 51 sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr, str, sizeof(str)); 52 53 rtrs_info(s, "disconnect for path %s requested\n", str); 54 /* first remove sysfs itself to avoid deadlock */ 55 sysfs_remove_file_self(&sess->kobj, &attr->attr); 56 close_sess(sess); 57 58 return count; 59 } 60 61 static struct kobj_attribute rtrs_srv_disconnect_attr = 62 __ATTR(disconnect, 0644, 63 rtrs_srv_disconnect_show, rtrs_srv_disconnect_store); 64 65 static ssize_t rtrs_srv_hca_port_show(struct kobject *kobj, 66 struct kobj_attribute *attr, 67 char *page) 68 { 69 struct rtrs_srv_sess *sess; 70 struct rtrs_con *usr_con; 71 72 sess = container_of(kobj, typeof(*sess), kobj); 73 usr_con = sess->s.con[0]; 74 75 return sysfs_emit(page, "%u\n", usr_con->cm_id->port_num); 76 } 77 78 static struct kobj_attribute rtrs_srv_hca_port_attr = 79 __ATTR(hca_port, 0444, rtrs_srv_hca_port_show, NULL); 80 81 static ssize_t rtrs_srv_hca_name_show(struct kobject *kobj, 82 struct kobj_attribute *attr, 83 char *page) 84 { 85 struct rtrs_srv_sess *sess; 86 87 sess = container_of(kobj, struct rtrs_srv_sess, kobj); 88 89 return sysfs_emit(page, "%s\n", sess->s.dev->ib_dev->name); 90 } 91 92 static struct kobj_attribute rtrs_srv_hca_name_attr = 93 __ATTR(hca_name, 0444, rtrs_srv_hca_name_show, NULL); 94 95 static ssize_t rtrs_srv_src_addr_show(struct kobject *kobj, 96 struct kobj_attribute *attr, 97 char *page) 98 { 99 struct rtrs_srv_sess *sess; 100 int cnt; 101 102 sess = container_of(kobj, struct rtrs_srv_sess, kobj); 103 cnt = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr, 104 page, PAGE_SIZE); 105 return cnt + scnprintf(page + cnt, PAGE_SIZE - cnt, "\n"); 106 } 107 108 static struct kobj_attribute rtrs_srv_src_addr_attr = 109 __ATTR(src_addr, 0444, rtrs_srv_src_addr_show, NULL); 110 111 static ssize_t rtrs_srv_dst_addr_show(struct kobject *kobj, 112 struct kobj_attribute *attr, 113 char *page) 114 { 115 struct rtrs_srv_sess *sess; 116 int len; 117 118 sess = container_of(kobj, struct rtrs_srv_sess, kobj); 119 len = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr, page, 120 PAGE_SIZE); 121 len += sysfs_emit_at(page, len, "\n"); 122 return len; 123 } 124 125 static struct kobj_attribute rtrs_srv_dst_addr_attr = 126 __ATTR(dst_addr, 0444, rtrs_srv_dst_addr_show, NULL); 127 128 static struct attribute *rtrs_srv_sess_attrs[] = { 129 &rtrs_srv_hca_name_attr.attr, 130 &rtrs_srv_hca_port_attr.attr, 131 &rtrs_srv_src_addr_attr.attr, 132 &rtrs_srv_dst_addr_attr.attr, 133 &rtrs_srv_disconnect_attr.attr, 134 NULL, 135 }; 136 137 static const struct attribute_group rtrs_srv_sess_attr_group = { 138 .attrs = rtrs_srv_sess_attrs, 139 }; 140 141 STAT_ATTR(struct rtrs_srv_stats, rdma, 142 rtrs_srv_stats_rdma_to_str, 143 rtrs_srv_reset_rdma_stats); 144 145 static struct attribute *rtrs_srv_stats_attrs[] = { 146 &rdma_attr.attr, 147 NULL, 148 }; 149 150 static const struct attribute_group rtrs_srv_stats_attr_group = { 151 .attrs = rtrs_srv_stats_attrs, 152 }; 153 154 static int rtrs_srv_create_once_sysfs_root_folders(struct rtrs_srv_sess *sess) 155 { 156 struct rtrs_srv *srv = sess->srv; 157 int err = 0; 158 159 mutex_lock(&srv->paths_mutex); 160 if (srv->dev_ref++) { 161 /* 162 * Device needs to be registered only on the first session 163 */ 164 goto unlock; 165 } 166 srv->dev.class = rtrs_dev_class; 167 err = dev_set_name(&srv->dev, "%s", sess->s.sessname); 168 if (err) 169 goto unlock; 170 171 /* 172 * Suppress user space notification until 173 * sysfs files are created 174 */ 175 dev_set_uevent_suppress(&srv->dev, true); 176 err = device_add(&srv->dev); 177 if (err) { 178 pr_err("device_add(): %d\n", err); 179 put_device(&srv->dev); 180 goto unlock; 181 } 182 srv->kobj_paths = kobject_create_and_add("paths", &srv->dev.kobj); 183 if (!srv->kobj_paths) { 184 err = -ENOMEM; 185 pr_err("kobject_create_and_add(): %d\n", err); 186 device_del(&srv->dev); 187 put_device(&srv->dev); 188 goto unlock; 189 } 190 dev_set_uevent_suppress(&srv->dev, false); 191 kobject_uevent(&srv->dev.kobj, KOBJ_ADD); 192 unlock: 193 mutex_unlock(&srv->paths_mutex); 194 195 return err; 196 } 197 198 static void 199 rtrs_srv_destroy_once_sysfs_root_folders(struct rtrs_srv_sess *sess) 200 { 201 struct rtrs_srv *srv = sess->srv; 202 203 mutex_lock(&srv->paths_mutex); 204 if (!--srv->dev_ref) { 205 kobject_del(srv->kobj_paths); 206 kobject_put(srv->kobj_paths); 207 mutex_unlock(&srv->paths_mutex); 208 device_del(&srv->dev); 209 put_device(&srv->dev); 210 } else { 211 put_device(&srv->dev); 212 mutex_unlock(&srv->paths_mutex); 213 } 214 } 215 216 static void rtrs_srv_sess_stats_release(struct kobject *kobj) 217 { 218 struct rtrs_srv_stats *stats; 219 220 stats = container_of(kobj, struct rtrs_srv_stats, kobj_stats); 221 222 kfree(stats); 223 } 224 225 static struct kobj_type ktype_stats = { 226 .sysfs_ops = &kobj_sysfs_ops, 227 .release = rtrs_srv_sess_stats_release, 228 }; 229 230 static int rtrs_srv_create_stats_files(struct rtrs_srv_sess *sess) 231 { 232 int err; 233 struct rtrs_sess *s = &sess->s; 234 235 err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats, 236 &sess->kobj, "stats"); 237 if (err) { 238 rtrs_err(s, "kobject_init_and_add(): %d\n", err); 239 kobject_put(&sess->stats->kobj_stats); 240 return err; 241 } 242 err = sysfs_create_group(&sess->stats->kobj_stats, 243 &rtrs_srv_stats_attr_group); 244 if (err) { 245 rtrs_err(s, "sysfs_create_group(): %d\n", err); 246 goto err; 247 } 248 249 return 0; 250 251 err: 252 kobject_del(&sess->stats->kobj_stats); 253 kobject_put(&sess->stats->kobj_stats); 254 255 return err; 256 } 257 258 int rtrs_srv_create_sess_files(struct rtrs_srv_sess *sess) 259 { 260 struct rtrs_srv *srv = sess->srv; 261 struct rtrs_sess *s = &sess->s; 262 char str[NAME_MAX]; 263 int err; 264 struct rtrs_addr path = { 265 .src = &sess->s.dst_addr, 266 .dst = &sess->s.src_addr, 267 }; 268 269 rtrs_addr_to_str(&path, str, sizeof(str)); 270 err = rtrs_srv_create_once_sysfs_root_folders(sess); 271 if (err) 272 return err; 273 274 err = kobject_init_and_add(&sess->kobj, &ktype, srv->kobj_paths, 275 "%s", str); 276 if (err) { 277 rtrs_err(s, "kobject_init_and_add(): %d\n", err); 278 goto destroy_root; 279 } 280 err = sysfs_create_group(&sess->kobj, &rtrs_srv_sess_attr_group); 281 if (err) { 282 rtrs_err(s, "sysfs_create_group(): %d\n", err); 283 goto put_kobj; 284 } 285 err = rtrs_srv_create_stats_files(sess); 286 if (err) 287 goto remove_group; 288 289 return 0; 290 291 remove_group: 292 sysfs_remove_group(&sess->kobj, &rtrs_srv_sess_attr_group); 293 put_kobj: 294 kobject_del(&sess->kobj); 295 destroy_root: 296 kobject_put(&sess->kobj); 297 rtrs_srv_destroy_once_sysfs_root_folders(sess); 298 299 return err; 300 } 301 302 void rtrs_srv_destroy_sess_files(struct rtrs_srv_sess *sess) 303 { 304 if (sess->kobj.state_in_sysfs) { 305 kobject_del(&sess->stats->kobj_stats); 306 kobject_put(&sess->stats->kobj_stats); 307 sysfs_remove_group(&sess->kobj, &rtrs_srv_sess_attr_group); 308 kobject_put(&sess->kobj); 309 310 rtrs_srv_destroy_once_sysfs_root_folders(sess); 311 } 312 } 313