drivers/infiniband/ulp/rtrs/rtrs.c

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