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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 | // SPDX-License-Identifier: GPL-2.0-or-later /* * RDMA Transport Layer * * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved. * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved. * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved. */ #undef pr_fmt #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt #include <linux/module.h> #include <linux/inet.h> #include "rtrs-pri.h" #include "rtrs-log.h" MODULE_DESCRIPTION("RDMA Transport Core"); MODULE_LICENSE("GPL"); struct rtrs_iu *rtrs_iu_alloc(u32 iu_num, size_t size, gfp_t gfp_mask, struct ib_device *dma_dev, enum dma_data_direction dir, void (*done)(struct ib_cq *cq, struct ib_wc *wc)) { struct rtrs_iu *ius, *iu; int i; ius = kcalloc(iu_num, sizeof(*ius), gfp_mask); if (!ius) return NULL; for (i = 0; i < iu_num; i++) { iu = &ius[i]; iu->direction = dir; iu->buf = kzalloc(size, gfp_mask); if (!iu->buf) goto err; iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir); if (ib_dma_mapping_error(dma_dev, iu->dma_addr)) goto err; iu->cqe.done = done; iu->size = size; } return ius; err: rtrs_iu_free(ius, dma_dev, i); return NULL; } EXPORT_SYMBOL_GPL(rtrs_iu_alloc); void rtrs_iu_free(struct rtrs_iu *ius, struct ib_device *ibdev, u32 queue_num) { struct rtrs_iu *iu; int i; if (!ius) return; for (i = 0; i < queue_num; i++) { iu = &ius[i]; ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, iu->direction); kfree(iu->buf); } kfree(ius); } EXPORT_SYMBOL_GPL(rtrs_iu_free); int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu) { struct rtrs_path *path = con->path; struct ib_recv_wr wr; struct ib_sge list; list.addr = iu->dma_addr; list.length = iu->size; list.lkey = path->dev->ib_pd->local_dma_lkey; if (list.length == 0) { rtrs_wrn(con->path, "Posting receive work request failed, sg list is empty\n"); return -EINVAL; } wr = (struct ib_recv_wr) { .wr_cqe = &iu->cqe, .sg_list = &list, .num_sge = 1, }; return ib_post_recv(con->qp, &wr, NULL); } EXPORT_SYMBOL_GPL(rtrs_iu_post_recv); int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe) { struct ib_recv_wr wr; wr = (struct ib_recv_wr) { .wr_cqe = cqe, }; return ib_post_recv(con->qp, &wr, NULL); } EXPORT_SYMBOL_GPL(rtrs_post_recv_empty); static int rtrs_post_send(struct ib_qp *qp, struct ib_send_wr *head, struct ib_send_wr *wr, struct ib_send_wr *tail) { if (head) { struct ib_send_wr *next = head; while (next->next) next = next->next; next->next = wr; } else { head = wr; } if (tail) wr->next = tail; return ib_post_send(qp, head, NULL); } int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size, struct ib_send_wr *head) { struct rtrs_path *path = con->path; struct ib_send_wr wr; struct ib_sge list; if (WARN_ON(size == 0)) return -EINVAL; list.addr = iu->dma_addr; list.length = size; list.lkey = path->dev->ib_pd->local_dma_lkey; wr = (struct ib_send_wr) { .wr_cqe = &iu->cqe, .sg_list = &list, .num_sge = 1, .opcode = IB_WR_SEND, .send_flags = IB_SEND_SIGNALED, }; return rtrs_post_send(con->qp, head, &wr, NULL); } EXPORT_SYMBOL_GPL(rtrs_iu_post_send); int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu, struct ib_sge *sge, unsigned int num_sge, u32 rkey, u64 rdma_addr, u32 imm_data, enum ib_send_flags flags, struct ib_send_wr *head, struct ib_send_wr *tail) { struct ib_rdma_wr wr; int i; wr = (struct ib_rdma_wr) { .wr.wr_cqe = &iu->cqe, .wr.sg_list = sge, .wr.num_sge = num_sge, .rkey = rkey, .remote_addr = rdma_addr, .wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM, .wr.ex.imm_data = cpu_to_be32(imm_data), .wr.send_flags = flags, }; /* * If one of the sges has 0 size, the operation will fail with a * length error */ for (i = 0; i < num_sge; i++) if (WARN_ONCE(sge[i].length == 0, "sg %d is zero length\n", i)) return -EINVAL; return rtrs_post_send(con->qp, head, &wr.wr, tail); } EXPORT_SYMBOL_GPL(rtrs_iu_post_rdma_write_imm); static int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con, struct ib_cqe *cqe, u32 imm_data, struct ib_send_wr *head) { struct ib_rdma_wr wr; struct rtrs_path *path = con->path; enum ib_send_flags sflags; atomic_dec_if_positive(&con->sq_wr_avail); sflags = (atomic_inc_return(&con->wr_cnt) % path->signal_interval) ? 0 : IB_SEND_SIGNALED; wr = (struct ib_rdma_wr) { .wr.wr_cqe = cqe, .wr.send_flags = sflags, .wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM, .wr.ex.imm_data = cpu_to_be32(imm_data), }; return rtrs_post_send(con->qp, head, &wr.wr, NULL); } static void qp_event_handler(struct ib_event *ev, void *ctx) { struct rtrs_con *con = ctx; switch (ev->event) { case IB_EVENT_COMM_EST: rtrs_info(con->path, "QP event %s (%d) received\n", ib_event_msg(ev->event), ev->event); rdma_notify(con->cm_id, IB_EVENT_COMM_EST); break; default: rtrs_info(con->path, "Unhandled QP event %s (%d) received\n", ib_event_msg(ev->event), ev->event); break; } } static bool is_pollqueue(struct rtrs_con *con) { return con->cid >= con->path->irq_con_num; } static int create_cq(struct rtrs_con *con, int cq_vector, int nr_cqe, enum ib_poll_context poll_ctx) { struct rdma_cm_id *cm_id = con->cm_id; struct ib_cq *cq; if (is_pollqueue(con)) cq = ib_alloc_cq(cm_id->device, con, nr_cqe, cq_vector, poll_ctx); else cq = ib_cq_pool_get(cm_id->device, nr_cqe, cq_vector, poll_ctx); if (IS_ERR(cq)) { rtrs_err(con->path, "Creating completion queue failed, errno: %ld\n", PTR_ERR(cq)); return PTR_ERR(cq); } con->cq = cq; con->nr_cqe = nr_cqe; return 0; } static int create_qp(struct rtrs_con *con, struct ib_pd *pd, u32 max_send_wr, u32 max_recv_wr, u32 max_sge) { struct ib_qp_init_attr init_attr = {NULL}; struct rdma_cm_id *cm_id = con->cm_id; int ret; init_attr.cap.max_send_wr = max_send_wr; init_attr.cap.max_recv_wr = max_recv_wr; init_attr.cap.max_recv_sge = 1; init_attr.event_handler = qp_event_handler; init_attr.qp_context = con; init_attr.cap.max_send_sge = max_sge; init_attr.qp_type = IB_QPT_RC; init_attr.send_cq = con->cq; init_attr.recv_cq = con->cq; init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; ret = rdma_create_qp(cm_id, pd, &init_attr); if (ret) { rtrs_err(con->path, "Creating QP failed, err: %d\n", ret); return ret; } con->qp = cm_id->qp; return ret; } static void destroy_cq(struct rtrs_con *con) { if (con->cq) { if (is_pollqueue(con)) ib_free_cq(con->cq); else ib_cq_pool_put(con->cq, con->nr_cqe); } con->cq = NULL; } int rtrs_cq_qp_create(struct rtrs_path *path, struct rtrs_con *con, u32 max_send_sge, int cq_vector, int nr_cqe, u32 max_send_wr, u32 max_recv_wr, enum ib_poll_context poll_ctx) { int err; err = create_cq(con, cq_vector, nr_cqe, poll_ctx); if (err) return err; err = create_qp(con, path->dev->ib_pd, max_send_wr, max_recv_wr, max_send_sge); if (err) { destroy_cq(con); return err; } con->path = path; return 0; } EXPORT_SYMBOL_GPL(rtrs_cq_qp_create); void rtrs_cq_qp_destroy(struct rtrs_con *con) { if (con->qp) { rdma_destroy_qp(con->cm_id); con->qp = NULL; } destroy_cq(con); } EXPORT_SYMBOL_GPL(rtrs_cq_qp_destroy); static void schedule_hb(struct rtrs_path *path) { queue_delayed_work(path->hb_wq, &path->hb_dwork, msecs_to_jiffies(path->hb_interval_ms)); } void rtrs_send_hb_ack(struct rtrs_path *path) { struct rtrs_con *usr_con = path->con[0]; u32 imm; int err; imm = rtrs_to_imm(RTRS_HB_ACK_IMM, 0); err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm, NULL); if (err) { rtrs_err(path, "send HB ACK failed, errno: %d\n", err); path->hb_err_handler(usr_con); return; } } EXPORT_SYMBOL_GPL(rtrs_send_hb_ack); static void hb_work(struct work_struct *work) { struct rtrs_con *usr_con; struct rtrs_path *path; u32 imm; int err; path = container_of(to_delayed_work(work), typeof(*path), hb_dwork); usr_con = path->con[0]; if (path->hb_missed_cnt > path->hb_missed_max) { rtrs_err(path, "HB missed max reached.\n"); path->hb_err_handler(usr_con); return; } if (path->hb_missed_cnt++) { /* Reschedule work without sending hb */ schedule_hb(path); return; } path->hb_last_sent = ktime_get(); imm = rtrs_to_imm(RTRS_HB_MSG_IMM, 0); err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm, NULL); if (err) { rtrs_err(path, "HB send failed, errno: %d\n", err); path->hb_err_handler(usr_con); return; } schedule_hb(path); } void rtrs_init_hb(struct rtrs_path *path, struct ib_cqe *cqe, unsigned int interval_ms, unsigned int missed_max, void (*err_handler)(struct rtrs_con *con), struct workqueue_struct *wq) { path->hb_cqe = cqe; path->hb_interval_ms = interval_ms; path->hb_err_handler = err_handler; path->hb_wq = wq; path->hb_missed_max = missed_max; path->hb_missed_cnt = 0; INIT_DELAYED_WORK(&path->hb_dwork, hb_work); } EXPORT_SYMBOL_GPL(rtrs_init_hb); void rtrs_start_hb(struct rtrs_path *path) { schedule_hb(path); } EXPORT_SYMBOL_GPL(rtrs_start_hb); void rtrs_stop_hb(struct rtrs_path *path) { cancel_delayed_work_sync(&path->hb_dwork); path->hb_missed_cnt = 0; } EXPORT_SYMBOL_GPL(rtrs_stop_hb); static int rtrs_str_gid_to_sockaddr(const char *addr, size_t len, short port, struct sockaddr_storage *dst) { struct sockaddr_ib *dst_ib = (struct sockaddr_ib *)dst; int ret; /* * We can use some of the IPv6 functions since GID is a valid * IPv6 address format */ ret = in6_pton(addr, len, dst_ib->sib_addr.sib_raw, '\0', NULL); if (ret == 0) return -EINVAL; dst_ib->sib_family = AF_IB; /* * Use the same TCP server port number as the IB service ID * on the IB port space range */ dst_ib->sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port); dst_ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL); dst_ib->sib_pkey = cpu_to_be16(0xffff); return 0; } /** * rtrs_str_to_sockaddr() - Convert rtrs address string to sockaddr * @addr: String representation of an addr (IPv4, IPv6 or IB GID): * - "ip:192.168.1.1" * - "ip:fe80::200:5aee:feaa:20a2" * - "gid:fe80::200:5aee:feaa:20a2" * @len: String address length * @port: Destination port * @dst: Destination sockaddr structure * * Returns 0 if conversion successful. Non-zero on error. */ static int rtrs_str_to_sockaddr(const char *addr, size_t len, u16 port, struct sockaddr_storage *dst) { if (strncmp(addr, "gid:", 4) == 0) { return rtrs_str_gid_to_sockaddr(addr + 4, len - 4, port, dst); } else if (strncmp(addr, "ip:", 3) == 0) { char port_str[8]; char *cpy; int err; snprintf(port_str, sizeof(port_str), "%u", port); cpy = kstrndup(addr + 3, len - 3, GFP_KERNEL); err = cpy ? inet_pton_with_scope(&init_net, AF_UNSPEC, cpy, port_str, dst) : -ENOMEM; kfree(cpy); return err; } return -EPROTONOSUPPORT; } /** * sockaddr_to_str() - convert sockaddr to a string. * @addr: the sockadddr structure to be converted. * @buf: string containing socket addr. * @len: string length. * * The return value is the number of characters written into buf not * including the trailing '\0'. If len is == 0 the function returns 0.. */ int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len) { switch (addr->sa_family) { case AF_IB: return scnprintf(buf, len, "gid:%pI6", &((struct sockaddr_ib *)addr)->sib_addr.sib_raw); case AF_INET: return scnprintf(buf, len, "ip:%pI4", &((struct sockaddr_in *)addr)->sin_addr); case AF_INET6: return scnprintf(buf, len, "ip:%pI6c", &((struct sockaddr_in6 *)addr)->sin6_addr); } return scnprintf(buf, len, "<invalid address family>"); } EXPORT_SYMBOL(sockaddr_to_str); /** * rtrs_addr_to_str() - convert rtrs_addr to a string "src@dst" * @addr: the rtrs_addr structure to be converted * @buf: string containing source and destination addr of a path * separated by '@' I.e. "ip:1.1.1.1@ip:1.1.1.2" * "ip:1.1.1.1@ip:1.1.1.2". * @len: string length * * The return value is the number of characters written into buf not * including the trailing '\0'. */ int rtrs_addr_to_str(const struct rtrs_addr *addr, char *buf, size_t len) { int cnt; cnt = sockaddr_to_str((struct sockaddr *)addr->src, buf, len); cnt += scnprintf(buf + cnt, len - cnt, "@"); sockaddr_to_str((struct sockaddr *)addr->dst, buf + cnt, len - cnt); return cnt; } EXPORT_SYMBOL(rtrs_addr_to_str); /** * rtrs_addr_to_sockaddr() - convert path string "src,dst" or "src@dst" * to sockaddreses * @str: string containing source and destination addr of a path * separated by ',' or '@' I.e. "ip:1.1.1.1,ip:1.1.1.2" or * "ip:1.1.1.1@ip:1.1.1.2". If str contains only one address it's * considered to be destination. * @len: string length * @port: Destination port number. * @addr: will be set to the source/destination address or to NULL * if str doesn't contain any source address. * * Returns zero if conversion successful. Non-zero otherwise. */ int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port, struct rtrs_addr *addr) { const char *d; d = strchr(str, ','); if (!d) d = strchr(str, '@'); if (d) { if (rtrs_str_to_sockaddr(str, d - str, 0, addr->src)) return -EINVAL; d += 1; len -= d - str; str = d; } else { addr->src = NULL; } return rtrs_str_to_sockaddr(str, len, port, addr->dst); } EXPORT_SYMBOL(rtrs_addr_to_sockaddr); void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags, struct rtrs_rdma_dev_pd *pool) { WARN_ON(pool->ops && (!pool->ops->alloc ^ !pool->ops->free)); INIT_LIST_HEAD(&pool->list); mutex_init(&pool->mutex); pool->pd_flags = pd_flags; } EXPORT_SYMBOL(rtrs_rdma_dev_pd_init); void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool) { mutex_destroy(&pool->mutex); WARN_ON(!list_empty(&pool->list)); } EXPORT_SYMBOL(rtrs_rdma_dev_pd_deinit); static void dev_free(struct kref *ref) { struct rtrs_rdma_dev_pd *pool; struct rtrs_ib_dev *dev; dev = container_of(ref, typeof(*dev), ref); pool = dev->pool; mutex_lock(&pool->mutex); list_del(&dev->entry); mutex_unlock(&pool->mutex); if (pool->ops && pool->ops->deinit) pool->ops->deinit(dev); ib_dealloc_pd(dev->ib_pd); if (pool->ops && pool->ops->free) pool->ops->free(dev); else kfree(dev); } int rtrs_ib_dev_put(struct rtrs_ib_dev *dev) { return kref_put(&dev->ref, dev_free); } EXPORT_SYMBOL(rtrs_ib_dev_put); static int rtrs_ib_dev_get(struct rtrs_ib_dev *dev) { return kref_get_unless_zero(&dev->ref); } struct rtrs_ib_dev * rtrs_ib_dev_find_or_add(struct ib_device *ib_dev, struct rtrs_rdma_dev_pd *pool) { struct rtrs_ib_dev *dev; mutex_lock(&pool->mutex); list_for_each_entry(dev, &pool->list, entry) { if (dev->ib_dev->node_guid == ib_dev->node_guid && rtrs_ib_dev_get(dev)) goto out_unlock; } mutex_unlock(&pool->mutex); if (pool->ops && pool->ops->alloc) dev = pool->ops->alloc(); else dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (IS_ERR_OR_NULL(dev)) goto out_err; kref_init(&dev->ref); dev->pool = pool; dev->ib_dev = ib_dev; dev->ib_pd = ib_alloc_pd(ib_dev, pool->pd_flags); if (IS_ERR(dev->ib_pd)) goto out_free_dev; if (pool->ops && pool->ops->init && pool->ops->init(dev)) goto out_free_pd; mutex_lock(&pool->mutex); list_add(&dev->entry, &pool->list); out_unlock: mutex_unlock(&pool->mutex); return dev; out_free_pd: ib_dealloc_pd(dev->ib_pd); out_free_dev: if (pool->ops && pool->ops->free) pool->ops->free(dev); else kfree(dev); out_err: return NULL; } EXPORT_SYMBOL(rtrs_ib_dev_find_or_add); |