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-clt.h" 14 #include "rtrs-log.h" 15 16 #define MIN_MAX_RECONN_ATT -1 17 #define MAX_MAX_RECONN_ATT 9999 18 19 static void rtrs_clt_sess_release(struct kobject *kobj) 20 { 21 struct rtrs_clt_sess *sess; 22 23 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 24 25 free_sess(sess); 26 } 27 28 static struct kobj_type ktype_sess = { 29 .sysfs_ops = &kobj_sysfs_ops, 30 .release = rtrs_clt_sess_release 31 }; 32 33 static void rtrs_clt_sess_stats_release(struct kobject *kobj) 34 { 35 struct rtrs_clt_stats *stats; 36 37 stats = container_of(kobj, struct rtrs_clt_stats, kobj_stats); 38 39 free_percpu(stats->pcpu_stats); 40 41 kfree(stats); 42 } 43 44 static struct kobj_type ktype_stats = { 45 .sysfs_ops = &kobj_sysfs_ops, 46 .release = rtrs_clt_sess_stats_release, 47 }; 48 49 static ssize_t max_reconnect_attempts_show(struct device *dev, 50 struct device_attribute *attr, 51 char *page) 52 { 53 struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev); 54 55 return sysfs_emit(page, "%d\n", 56 rtrs_clt_get_max_reconnect_attempts(clt)); 57 } 58 59 static ssize_t max_reconnect_attempts_store(struct device *dev, 60 struct device_attribute *attr, 61 const char *buf, 62 size_t count) 63 { 64 int value; 65 int ret; 66 struct rtrs_clt *clt = container_of(dev, struct rtrs_clt, dev); 67 68 ret = kstrtoint(buf, 10, &value); 69 if (ret) { 70 rtrs_err(clt, "%s: failed to convert string '%s' to int\n", 71 attr->attr.name, buf); 72 return ret; 73 } 74 if (value > MAX_MAX_RECONN_ATT || 75 value < MIN_MAX_RECONN_ATT) { 76 rtrs_err(clt, 77 "%s: invalid range (provided: '%s', accepted: min: %d, max: %d)\n", 78 attr->attr.name, buf, MIN_MAX_RECONN_ATT, 79 MAX_MAX_RECONN_ATT); 80 return -EINVAL; 81 } 82 rtrs_clt_set_max_reconnect_attempts(clt, value); 83 84 return count; 85 } 86 87 static DEVICE_ATTR_RW(max_reconnect_attempts); 88 89 static ssize_t mpath_policy_show(struct device *dev, 90 struct device_attribute *attr, 91 char *page) 92 { 93 struct rtrs_clt *clt; 94 95 clt = container_of(dev, struct rtrs_clt, dev); 96 97 switch (clt->mp_policy) { 98 case MP_POLICY_RR: 99 return sysfs_emit(page, "round-robin (RR: %d)\n", 100 clt->mp_policy); 101 case MP_POLICY_MIN_INFLIGHT: 102 return sysfs_emit(page, "min-inflight (MI: %d)\n", 103 clt->mp_policy); 104 case MP_POLICY_MIN_LATENCY: 105 return sysfs_emit(page, "min-latency (ML: %d)\n", 106 clt->mp_policy); 107 default: 108 return sysfs_emit(page, "Unknown (%d)\n", clt->mp_policy); 109 } 110 } 111 112 static ssize_t mpath_policy_store(struct device *dev, 113 struct device_attribute *attr, 114 const char *buf, 115 size_t count) 116 { 117 struct rtrs_clt *clt; 118 int value; 119 int ret; 120 size_t len = 0; 121 122 clt = container_of(dev, struct rtrs_clt, dev); 123 124 ret = kstrtoint(buf, 10, &value); 125 if (!ret && (value == MP_POLICY_RR || 126 value == MP_POLICY_MIN_INFLIGHT || 127 value == MP_POLICY_MIN_LATENCY)) { 128 clt->mp_policy = value; 129 return count; 130 } 131 132 /* distinguish "mi" and "min-latency" with length */ 133 len = strnlen(buf, NAME_MAX); 134 if (buf[len - 1] == '\n') 135 len--; 136 137 if (!strncasecmp(buf, "round-robin", 11) || 138 (len == 2 && !strncasecmp(buf, "rr", 2))) 139 clt->mp_policy = MP_POLICY_RR; 140 else if (!strncasecmp(buf, "min-inflight", 12) || 141 (len == 2 && !strncasecmp(buf, "mi", 2))) 142 clt->mp_policy = MP_POLICY_MIN_INFLIGHT; 143 else if (!strncasecmp(buf, "min-latency", 11) || 144 (len == 2 && !strncasecmp(buf, "ml", 2))) 145 clt->mp_policy = MP_POLICY_MIN_LATENCY; 146 else 147 return -EINVAL; 148 149 return count; 150 } 151 152 static DEVICE_ATTR_RW(mpath_policy); 153 154 static ssize_t add_path_show(struct device *dev, 155 struct device_attribute *attr, char *page) 156 { 157 return sysfs_emit( 158 page, 159 "Usage: echo [<source addr>@]<destination addr> > %s\n\n*addr ::= [ ip:<ipv4|ipv6> | gid:<gid> ]\n", 160 attr->attr.name); 161 } 162 163 static ssize_t add_path_store(struct device *dev, 164 struct device_attribute *attr, 165 const char *buf, size_t count) 166 { 167 struct sockaddr_storage srcaddr, dstaddr; 168 struct rtrs_addr addr = { 169 .src = &srcaddr, 170 .dst = &dstaddr 171 }; 172 struct rtrs_clt *clt; 173 const char *nl; 174 size_t len; 175 int err; 176 177 clt = container_of(dev, struct rtrs_clt, dev); 178 179 nl = strchr(buf, '\n'); 180 if (nl) 181 len = nl - buf; 182 else 183 len = count; 184 err = rtrs_addr_to_sockaddr(buf, len, clt->port, &addr); 185 if (err) 186 return -EINVAL; 187 188 err = rtrs_clt_create_path_from_sysfs(clt, &addr); 189 if (err) 190 return err; 191 192 return count; 193 } 194 195 static DEVICE_ATTR_RW(add_path); 196 197 static ssize_t rtrs_clt_state_show(struct kobject *kobj, 198 struct kobj_attribute *attr, char *page) 199 { 200 struct rtrs_clt_sess *sess; 201 202 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 203 if (sess->state == RTRS_CLT_CONNECTED) 204 return sysfs_emit(page, "connected\n"); 205 206 return sysfs_emit(page, "disconnected\n"); 207 } 208 209 static struct kobj_attribute rtrs_clt_state_attr = 210 __ATTR(state, 0444, rtrs_clt_state_show, NULL); 211 212 static ssize_t rtrs_clt_reconnect_show(struct kobject *kobj, 213 struct kobj_attribute *attr, char *buf) 214 { 215 return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name); 216 } 217 218 static ssize_t rtrs_clt_reconnect_store(struct kobject *kobj, 219 struct kobj_attribute *attr, 220 const char *buf, size_t count) 221 { 222 struct rtrs_clt_sess *sess; 223 int ret; 224 225 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 226 if (!sysfs_streq(buf, "1")) { 227 rtrs_err(sess->clt, "%s: unknown value: '%s'\n", 228 attr->attr.name, buf); 229 return -EINVAL; 230 } 231 ret = rtrs_clt_reconnect_from_sysfs(sess); 232 if (ret) 233 return ret; 234 235 return count; 236 } 237 238 static struct kobj_attribute rtrs_clt_reconnect_attr = 239 __ATTR(reconnect, 0644, rtrs_clt_reconnect_show, 240 rtrs_clt_reconnect_store); 241 242 static ssize_t rtrs_clt_disconnect_show(struct kobject *kobj, 243 struct kobj_attribute *attr, char *buf) 244 { 245 return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name); 246 } 247 248 static ssize_t rtrs_clt_disconnect_store(struct kobject *kobj, 249 struct kobj_attribute *attr, 250 const char *buf, size_t count) 251 { 252 struct rtrs_clt_sess *sess; 253 int ret; 254 255 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 256 if (!sysfs_streq(buf, "1")) { 257 rtrs_err(sess->clt, "%s: unknown value: '%s'\n", 258 attr->attr.name, buf); 259 return -EINVAL; 260 } 261 ret = rtrs_clt_disconnect_from_sysfs(sess); 262 if (ret) 263 return ret; 264 265 return count; 266 } 267 268 static struct kobj_attribute rtrs_clt_disconnect_attr = 269 __ATTR(disconnect, 0644, rtrs_clt_disconnect_show, 270 rtrs_clt_disconnect_store); 271 272 static ssize_t rtrs_clt_remove_path_show(struct kobject *kobj, 273 struct kobj_attribute *attr, char *buf) 274 { 275 return sysfs_emit(buf, "Usage: echo 1 > %s\n", attr->attr.name); 276 } 277 278 static ssize_t rtrs_clt_remove_path_store(struct kobject *kobj, 279 struct kobj_attribute *attr, 280 const char *buf, size_t count) 281 { 282 struct rtrs_clt_sess *sess; 283 int ret; 284 285 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 286 if (!sysfs_streq(buf, "1")) { 287 rtrs_err(sess->clt, "%s: unknown value: '%s'\n", 288 attr->attr.name, buf); 289 return -EINVAL; 290 } 291 ret = rtrs_clt_remove_path_from_sysfs(sess, &attr->attr); 292 if (ret) 293 return ret; 294 295 return count; 296 } 297 298 static struct kobj_attribute rtrs_clt_remove_path_attr = 299 __ATTR(remove_path, 0644, rtrs_clt_remove_path_show, 300 rtrs_clt_remove_path_store); 301 302 STAT_ATTR(struct rtrs_clt_stats, cpu_migration, 303 rtrs_clt_stats_migration_cnt_to_str, 304 rtrs_clt_reset_cpu_migr_stats); 305 306 STAT_ATTR(struct rtrs_clt_stats, reconnects, 307 rtrs_clt_stats_reconnects_to_str, 308 rtrs_clt_reset_reconnects_stat); 309 310 STAT_ATTR(struct rtrs_clt_stats, rdma, 311 rtrs_clt_stats_rdma_to_str, 312 rtrs_clt_reset_rdma_stats); 313 314 STAT_ATTR(struct rtrs_clt_stats, reset_all, 315 rtrs_clt_reset_all_help, 316 rtrs_clt_reset_all_stats); 317 318 static struct attribute *rtrs_clt_stats_attrs[] = { 319 &cpu_migration_attr.attr, 320 &reconnects_attr.attr, 321 &rdma_attr.attr, 322 &reset_all_attr.attr, 323 NULL 324 }; 325 326 static const struct attribute_group rtrs_clt_stats_attr_group = { 327 .attrs = rtrs_clt_stats_attrs, 328 }; 329 330 static ssize_t rtrs_clt_hca_port_show(struct kobject *kobj, 331 struct kobj_attribute *attr, 332 char *page) 333 { 334 struct rtrs_clt_sess *sess; 335 336 sess = container_of(kobj, typeof(*sess), kobj); 337 338 return sysfs_emit(page, "%u\n", sess->hca_port); 339 } 340 341 static struct kobj_attribute rtrs_clt_hca_port_attr = 342 __ATTR(hca_port, 0444, rtrs_clt_hca_port_show, NULL); 343 344 static ssize_t rtrs_clt_hca_name_show(struct kobject *kobj, 345 struct kobj_attribute *attr, 346 char *page) 347 { 348 struct rtrs_clt_sess *sess; 349 350 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 351 352 return sysfs_emit(page, "%s\n", sess->hca_name); 353 } 354 355 static struct kobj_attribute rtrs_clt_hca_name_attr = 356 __ATTR(hca_name, 0444, rtrs_clt_hca_name_show, NULL); 357 358 static ssize_t rtrs_clt_cur_latency_show(struct kobject *kobj, 359 struct kobj_attribute *attr, 360 char *page) 361 { 362 struct rtrs_clt_sess *sess; 363 364 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 365 366 return sysfs_emit(page, "%lld ns\n", 367 ktime_to_ns(sess->s.hb_cur_latency)); 368 } 369 370 static struct kobj_attribute rtrs_clt_cur_latency_attr = 371 __ATTR(cur_latency, 0444, rtrs_clt_cur_latency_show, NULL); 372 373 static ssize_t rtrs_clt_src_addr_show(struct kobject *kobj, 374 struct kobj_attribute *attr, 375 char *page) 376 { 377 struct rtrs_clt_sess *sess; 378 int len; 379 380 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 381 len = sockaddr_to_str((struct sockaddr *)&sess->s.src_addr, page, 382 PAGE_SIZE); 383 len += sysfs_emit_at(page, len, "\n"); 384 return len; 385 } 386 387 static struct kobj_attribute rtrs_clt_src_addr_attr = 388 __ATTR(src_addr, 0444, rtrs_clt_src_addr_show, NULL); 389 390 static ssize_t rtrs_clt_dst_addr_show(struct kobject *kobj, 391 struct kobj_attribute *attr, 392 char *page) 393 { 394 struct rtrs_clt_sess *sess; 395 int len; 396 397 sess = container_of(kobj, struct rtrs_clt_sess, kobj); 398 len = sockaddr_to_str((struct sockaddr *)&sess->s.dst_addr, page, 399 PAGE_SIZE); 400 len += sysfs_emit_at(page, len, "\n"); 401 return len; 402 } 403 404 static struct kobj_attribute rtrs_clt_dst_addr_attr = 405 __ATTR(dst_addr, 0444, rtrs_clt_dst_addr_show, NULL); 406 407 static struct attribute *rtrs_clt_sess_attrs[] = { 408 &rtrs_clt_hca_name_attr.attr, 409 &rtrs_clt_hca_port_attr.attr, 410 &rtrs_clt_src_addr_attr.attr, 411 &rtrs_clt_dst_addr_attr.attr, 412 &rtrs_clt_state_attr.attr, 413 &rtrs_clt_reconnect_attr.attr, 414 &rtrs_clt_disconnect_attr.attr, 415 &rtrs_clt_remove_path_attr.attr, 416 &rtrs_clt_cur_latency_attr.attr, 417 NULL, 418 }; 419 420 static const struct attribute_group rtrs_clt_sess_attr_group = { 421 .attrs = rtrs_clt_sess_attrs, 422 }; 423 424 int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess) 425 { 426 struct rtrs_clt *clt = sess->clt; 427 char str[NAME_MAX]; 428 int err; 429 struct rtrs_addr path = { 430 .src = &sess->s.src_addr, 431 .dst = &sess->s.dst_addr, 432 }; 433 434 rtrs_addr_to_str(&path, str, sizeof(str)); 435 err = kobject_init_and_add(&sess->kobj, &ktype_sess, clt->kobj_paths, 436 "%s", str); 437 if (err) { 438 pr_err("kobject_init_and_add: %d\n", err); 439 kobject_put(&sess->kobj); 440 return err; 441 } 442 err = sysfs_create_group(&sess->kobj, &rtrs_clt_sess_attr_group); 443 if (err) { 444 pr_err("sysfs_create_group(): %d\n", err); 445 goto put_kobj; 446 } 447 err = kobject_init_and_add(&sess->stats->kobj_stats, &ktype_stats, 448 &sess->kobj, "stats"); 449 if (err) { 450 pr_err("kobject_init_and_add: %d\n", err); 451 kobject_put(&sess->stats->kobj_stats); 452 goto remove_group; 453 } 454 455 err = sysfs_create_group(&sess->stats->kobj_stats, 456 &rtrs_clt_stats_attr_group); 457 if (err) { 458 pr_err("failed to create stats sysfs group, err: %d\n", err); 459 goto put_kobj_stats; 460 } 461 462 return 0; 463 464 put_kobj_stats: 465 kobject_del(&sess->stats->kobj_stats); 466 kobject_put(&sess->stats->kobj_stats); 467 remove_group: 468 sysfs_remove_group(&sess->kobj, &rtrs_clt_sess_attr_group); 469 put_kobj: 470 kobject_del(&sess->kobj); 471 kobject_put(&sess->kobj); 472 473 return err; 474 } 475 476 void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess, 477 const struct attribute *sysfs_self) 478 { 479 kobject_del(&sess->stats->kobj_stats); 480 kobject_put(&sess->stats->kobj_stats); 481 if (sysfs_self) 482 sysfs_remove_file_self(&sess->kobj, sysfs_self); 483 kobject_del(&sess->kobj); 484 } 485 486 static struct attribute *rtrs_clt_attrs[] = { 487 &dev_attr_max_reconnect_attempts.attr, 488 &dev_attr_mpath_policy.attr, 489 &dev_attr_add_path.attr, 490 NULL, 491 }; 492 493 static const struct attribute_group rtrs_clt_attr_group = { 494 .attrs = rtrs_clt_attrs, 495 }; 496 497 int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt) 498 { 499 return sysfs_create_group(&clt->dev.kobj, &rtrs_clt_attr_group); 500 } 501 502 void rtrs_clt_destroy_sysfs_root(struct rtrs_clt *clt) 503 { 504 sysfs_remove_group(&clt->dev.kobj, &rtrs_clt_attr_group); 505 506 if (clt->kobj_paths) { 507 kobject_del(clt->kobj_paths); 508 kobject_put(clt->kobj_paths); 509 } 510 } 511