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