sys/dev/iser/icl_iser.c

   1 /* $FreeBSD$ */
   2 /*-
   3  * Copyright (c) 2015, Mellanox Technologies, Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include "icl_iser.h"
  28
  29 SYSCTL_NODE(_kern, OID_AUTO, iser, CTLFLAG_RW, 0, "iSER module");
  30 int iser_debug = 0;
  31 SYSCTL_INT(_kern_iser, OID_AUTO, debug, CTLFLAG_RWTUN,
  32     &iser_debug, 0, "Enable iser debug messages");
  33
  34 static MALLOC_DEFINE(M_ICL_ISER, "icl_iser", "iSCSI iser backend");
  35 static uma_zone_t icl_pdu_zone;
  36
  37 static volatile u_int   icl_iser_ncons;
  38 struct iser_global ig;
  39
  40 static void iser_conn_release(struct icl_conn *ic);
  41
  42 static icl_conn_new_pdu_t       iser_conn_new_pdu;
  43 static icl_conn_pdu_free_t      iser_conn_pdu_free;
  44 static icl_conn_pdu_data_segment_length_t iser_conn_pdu_data_segment_length;
  45 static icl_conn_pdu_append_data_t       iser_conn_pdu_append_data;
  46 static icl_conn_pdu_queue_t     iser_conn_pdu_queue;
  47 static icl_conn_handoff_t       iser_conn_handoff;
  48 static icl_conn_free_t          iser_conn_free;
  49 static icl_conn_close_t         iser_conn_close;
  50 static icl_conn_connect_t       iser_conn_connect;
  51 static icl_conn_task_setup_t    iser_conn_task_setup;
  52 static icl_conn_task_done_t     iser_conn_task_done;
  53 static icl_conn_pdu_get_data_t  iser_conn_pdu_get_data;
  54
  55 static kobj_method_t icl_iser_methods[] = {
  56         KOBJMETHOD(icl_conn_new_pdu, iser_conn_new_pdu),
  57         KOBJMETHOD(icl_conn_pdu_free, iser_conn_pdu_free),
  58         KOBJMETHOD(icl_conn_pdu_data_segment_length, iser_conn_pdu_data_segment_length),
  59         KOBJMETHOD(icl_conn_pdu_append_data, iser_conn_pdu_append_data),
  60         KOBJMETHOD(icl_conn_pdu_queue, iser_conn_pdu_queue),
  61         KOBJMETHOD(icl_conn_handoff, iser_conn_handoff),
  62         KOBJMETHOD(icl_conn_free, iser_conn_free),
  63         KOBJMETHOD(icl_conn_close, iser_conn_close),
  64         KOBJMETHOD(icl_conn_connect, iser_conn_connect),
  65         KOBJMETHOD(icl_conn_task_setup, iser_conn_task_setup),
  66         KOBJMETHOD(icl_conn_task_done, iser_conn_task_done),
  67         KOBJMETHOD(icl_conn_pdu_get_data, iser_conn_pdu_get_data),
  68         { 0, 0 }
  69 };
  70
  71 DEFINE_CLASS(icl_iser, icl_iser_methods, sizeof(struct iser_conn));
  72
  73 /**
  74  * iser_initialize_headers() - Initialize task headers
  75  * @pdu:       iser pdu
  76  * @iser_conn:    iser connection
  77  *
  78  * Notes:
  79  * This routine may race with iser teardown flow for scsi
  80  * error handling TMFs. So for TMF we should acquire the
  81  * state mutex to avoid dereferencing the IB device which
  82  * may have already been terminated (racing teardown sequence).
  83  */
  84 int
  85 iser_initialize_headers(struct icl_iser_pdu *pdu, struct iser_conn *iser_conn)
  86 {
  87         struct iser_tx_desc *tx_desc = &pdu->desc;
  88         struct iser_device *device = iser_conn->ib_conn.device;
  89         u64 dma_addr;
  90         int ret = 0;
  91
  92         dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
  93                                 ISER_HEADERS_LEN, DMA_TO_DEVICE);
  94         if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
  95                 ret = -ENOMEM;
  96                 goto out;
  97         }
  98
  99         tx_desc->mapped = true;
 100         tx_desc->dma_addr = dma_addr;
 101         tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
 102         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 103         tx_desc->tx_sg[0].lkey   = device->mr->lkey;
 104
 105 out:
 106
 107         return (ret);
 108 }
 109
 110 int
 111 iser_conn_pdu_append_data(struct icl_conn *ic, struct icl_pdu *request,
 112                           const void *addr, size_t len, int flags)
 113 {
 114         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 115
 116         if (request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_LOGIN_REQUEST ||
 117             request->ip_bhs->bhs_opcode & ISCSI_BHS_OPCODE_TEXT_REQUEST) {
 118                 ISER_DBG("copy to login buff");
 119                 memcpy(iser_conn->login_req_buf, addr, len);
 120                 request->ip_data_len = len;
 121         }
 122
 123         return (0);
 124 }
 125
 126 void
 127 iser_conn_pdu_get_data(struct icl_conn *ic, struct icl_pdu *ip,
 128                        size_t off, void *addr, size_t len)
 129 {
 130         /* If we have a receive data, copy it to upper layer buffer */
 131         if (ip->ip_data_mbuf)
 132                 memcpy(addr, ip->ip_data_mbuf + off, len);
 133 }
 134
 135 /*
 136  * Allocate icl_pdu with empty BHS to fill up by the caller.
 137  */
 138 struct icl_pdu *
 139 iser_new_pdu(struct icl_conn *ic, int flags)
 140 {
 141         struct icl_iser_pdu *iser_pdu;
 142         struct icl_pdu *ip;
 143         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 144
 145         iser_pdu = uma_zalloc(icl_pdu_zone, flags | M_ZERO);
 146         if (iser_pdu == NULL) {
 147                 ISER_WARN("failed to allocate %zd bytes", sizeof(*iser_pdu));
 148                 return (NULL);
 149         }
 150
 151         iser_pdu->iser_conn = iser_conn;
 152         ip = &iser_pdu->icl_pdu;
 153         ip->ip_conn = ic;
 154         ip->ip_bhs = &iser_pdu->desc.iscsi_header;
 155
 156         return (ip);
 157 }
 158
 159 struct icl_pdu *
 160 iser_conn_new_pdu(struct icl_conn *ic, int flags)
 161 {
 162         return (iser_new_pdu(ic, flags));
 163 }
 164
 165 void
 166 iser_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
 167 {
 168         struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
 169
 170         uma_zfree(icl_pdu_zone, iser_pdu);
 171 }
 172
 173 size_t
 174 iser_conn_pdu_data_segment_length(struct icl_conn *ic,
 175                                   const struct icl_pdu *request)
 176 {
 177         uint32_t len = 0;
 178
 179         len += request->ip_bhs->bhs_data_segment_len[0];
 180         len <<= 8;
 181         len += request->ip_bhs->bhs_data_segment_len[1];
 182         len <<= 8;
 183         len += request->ip_bhs->bhs_data_segment_len[2];
 184
 185         return (len);
 186 }
 187
 188 void
 189 iser_conn_pdu_free(struct icl_conn *ic, struct icl_pdu *ip)
 190 {
 191         iser_pdu_free(ic, ip);
 192 }
 193
 194 static bool
 195 is_control_opcode(uint8_t opcode)
 196 {
 197         bool is_control = false;
 198
 199         switch (opcode & ISCSI_OPCODE_MASK) {
 200                 case ISCSI_BHS_OPCODE_NOP_OUT:
 201                 case ISCSI_BHS_OPCODE_LOGIN_REQUEST:
 202                 case ISCSI_BHS_OPCODE_LOGOUT_REQUEST:
 203                 case ISCSI_BHS_OPCODE_TEXT_REQUEST:
 204                         is_control = true;
 205                         break;
 206                 case ISCSI_BHS_OPCODE_SCSI_COMMAND:
 207                         is_control = false;
 208                         break;
 209                 default:
 210                         ISER_ERR("unknown opcode %d", opcode);
 211         }
 212
 213         return (is_control);
 214 }
 215
 216 void
 217 iser_conn_pdu_queue(struct icl_conn *ic, struct icl_pdu *ip)
 218 {
 219         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 220         struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
 221         int ret;
 222
 223         if (iser_conn->state != ISER_CONN_UP)
 224                 return;
 225
 226         ret = iser_initialize_headers(iser_pdu, iser_conn);
 227         if (ret) {
 228                 ISER_ERR("Failed to map TX descriptor pdu %p", iser_pdu);
 229                 return;
 230         }
 231
 232         if (is_control_opcode(ip->ip_bhs->bhs_opcode)) {
 233                 ret = iser_send_control(iser_conn, iser_pdu);
 234                 if (unlikely(ret))
 235                         ISER_ERR("Failed to send control pdu %p", iser_pdu);
 236         } else {
 237                 ret = iser_send_command(iser_conn, iser_pdu);
 238                 if (unlikely(ret))
 239                         ISER_ERR("Failed to send command pdu %p", iser_pdu);
 240         }
 241 }
 242
 243 static struct icl_conn *
 244 iser_new_conn(const char *name, struct mtx *lock)
 245 {
 246         struct iser_conn *iser_conn;
 247         struct icl_conn *ic;
 248
 249         refcount_acquire(&icl_iser_ncons);
 250
 251         iser_conn = (struct iser_conn *)kobj_create(&icl_iser_class, M_ICL_ISER, M_WAITOK | M_ZERO);
 252         if (!iser_conn) {
 253                 ISER_ERR("failed to allocate iser conn");
 254                 refcount_release(&icl_iser_ncons);
 255                 return (NULL);
 256         }
 257
 258         cv_init(&iser_conn->up_cv, "iser_cv");
 259         sx_init(&iser_conn->state_mutex, "iser_conn_state_mutex");
 260         mtx_init(&iser_conn->ib_conn.beacon.flush_lock, "flush_lock", NULL, MTX_DEF);
 261         cv_init(&iser_conn->ib_conn.beacon.flush_cv, "flush_cv");
 262         mtx_init(&iser_conn->ib_conn.lock, "lock", NULL, MTX_DEF);
 263
 264         ic = &iser_conn->icl_conn;
 265         ic->ic_lock = lock;
 266         ic->ic_name = name;
 267         ic->ic_offload = strdup("iser", M_TEMP);
 268         ic->ic_iser = true;
 269         ic->ic_unmapped = true;
 270
 271         return (ic);
 272 }
 273
 274 void
 275 iser_conn_free(struct icl_conn *ic)
 276 {
 277         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 278
 279         iser_conn_release(ic);
 280         cv_destroy(&iser_conn->ib_conn.beacon.flush_cv);
 281         mtx_destroy(&iser_conn->ib_conn.beacon.flush_lock);
 282         sx_destroy(&iser_conn->state_mutex);
 283         cv_destroy(&iser_conn->up_cv);
 284         kobj_delete((struct kobj *)iser_conn, M_ICL_ISER);
 285         refcount_release(&icl_iser_ncons);
 286 }
 287
 288 int
 289 iser_conn_handoff(struct icl_conn *ic, int fd)
 290 {
 291         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 292         int error = 0;
 293
 294         sx_xlock(&iser_conn->state_mutex);
 295         if (iser_conn->state != ISER_CONN_UP) {
 296                 error = EINVAL;
 297                 ISER_ERR("iser_conn %p state is %d, teardown started\n",
 298                          iser_conn, iser_conn->state);
 299                 goto out;
 300         }
 301
 302         error = iser_alloc_rx_descriptors(iser_conn, ic->ic_maxtags);
 303         if (error)
 304                 goto out;
 305
 306         error = iser_post_recvm(iser_conn, iser_conn->min_posted_rx);
 307         if (error)
 308                 goto post_error;
 309
 310         iser_conn->handoff_done = true;
 311
 312         sx_xunlock(&iser_conn->state_mutex);
 313         return (error);
 314
 315 post_error:
 316         iser_free_rx_descriptors(iser_conn);
 317 out:
 318         sx_xunlock(&iser_conn->state_mutex);
 319         return (error);
 320
 321 }
 322
 323 /**
 324  * Frees all conn objects
 325  */
 326 static void
 327 iser_conn_release(struct icl_conn *ic)
 328 {
 329         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 330         struct ib_conn *ib_conn = &iser_conn->ib_conn;
 331         struct iser_conn *curr, *tmp;
 332
 333         mtx_lock(&ig.connlist_mutex);
 334         /*
 335          * Search for iser connection in global list.
 336          * It may not be there in case of failure in connection establishment
 337          * stage.
 338          */
 339         list_for_each_entry_safe(curr, tmp, &ig.connlist, conn_list) {
 340                 if (iser_conn == curr) {
 341                         ISER_WARN("found iser_conn %p", iser_conn);
 342                         list_del(&iser_conn->conn_list);
 343                 }
 344         }
 345         mtx_unlock(&ig.connlist_mutex);
 346
 347         /*
 348          * In case we reconnecting or removing session, we need to
 349          * release IB resources (which is safe to call more than once).
 350          */
 351         sx_xlock(&iser_conn->state_mutex);
 352         iser_free_ib_conn_res(iser_conn, true);
 353         sx_xunlock(&iser_conn->state_mutex);
 354
 355         if (ib_conn->cma_id != NULL) {
 356                 rdma_destroy_id(ib_conn->cma_id);
 357                 ib_conn->cma_id = NULL;
 358         }
 359
 360 }
 361
 362 void
 363 iser_conn_close(struct icl_conn *ic)
 364 {
 365         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 366
 367         ISER_INFO("closing conn %p", iser_conn);
 368
 369         sx_xlock(&iser_conn->state_mutex);
 370         /*
 371          * In case iser connection is waiting on conditional variable
 372          * (state PENDING) and we try to close it before connection establishment,
 373          * we need to signal it to continue releasing connection properly.
 374          */
 375         if (!iser_conn_terminate(iser_conn) && iser_conn->state == ISER_CONN_PENDING)
 376                 cv_signal(&iser_conn->up_cv);
 377         sx_xunlock(&iser_conn->state_mutex);
 378
 379 }
 380
 381 int
 382 iser_conn_connect(struct icl_conn *ic, int domain, int socktype,
 383                 int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
 384 {
 385         struct iser_conn *iser_conn = icl_to_iser_conn(ic);
 386         struct ib_conn *ib_conn = &iser_conn->ib_conn;
 387         int err = 0;
 388
 389         iser_conn_release(ic);
 390
 391         sx_xlock(&iser_conn->state_mutex);
 392          /* the device is known only --after-- address resolution */
 393         ib_conn->device = NULL;
 394         iser_conn->handoff_done = false;
 395
 396         iser_conn->state = ISER_CONN_PENDING;
 397
 398         ib_conn->cma_id = rdma_create_id(iser_cma_handler, (void *)iser_conn,
 399                         RDMA_PS_TCP, IB_QPT_RC);
 400         if (IS_ERR(ib_conn->cma_id)) {
 401                 err = -PTR_ERR(ib_conn->cma_id);
 402                 ISER_ERR("rdma_create_id failed: %d", err);
 403                 goto id_failure;
 404         }
 405
 406         err = rdma_resolve_addr(ib_conn->cma_id, from_sa, to_sa, 1000);
 407         if (err) {
 408                 ISER_ERR("rdma_resolve_addr failed: %d", err);
 409                 if (err < 0)
 410                         err = -err;
 411                 goto addr_failure;
 412         }
 413
 414         ISER_DBG("before cv_wait: %p", iser_conn);
 415         cv_wait(&iser_conn->up_cv, &iser_conn->state_mutex);
 416         ISER_DBG("after cv_wait: %p", iser_conn);
 417
 418         if (iser_conn->state != ISER_CONN_UP) {
 419                 err = EIO;
 420                 goto addr_failure;
 421         }
 422
 423         err = iser_alloc_login_buf(iser_conn);
 424         if (err)
 425                 goto addr_failure;
 426         sx_xunlock(&iser_conn->state_mutex);
 427
 428         mtx_lock(&ig.connlist_mutex);
 429         list_add(&iser_conn->conn_list, &ig.connlist);
 430         mtx_unlock(&ig.connlist_mutex);
 431
 432         return (0);
 433
 434 id_failure:
 435         ib_conn->cma_id = NULL;
 436 addr_failure:
 437         sx_xunlock(&iser_conn->state_mutex);
 438         return (err);
 439 }
 440
 441 int
 442 iser_conn_task_setup(struct icl_conn *ic, struct icl_pdu *ip,
 443                      struct ccb_scsiio *csio,
 444                      uint32_t *task_tagp, void **prvp)
 445 {
 446         struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
 447
 448         *prvp = ip;
 449         iser_pdu->csio = csio;
 450
 451         return (0);
 452 }
 453
 454 void
 455 iser_conn_task_done(struct icl_conn *ic, void *prv)
 456 {
 457         struct icl_pdu *ip = prv;
 458         struct icl_iser_pdu *iser_pdu = icl_to_iser_pdu(ip);
 459         struct iser_device *device = iser_pdu->iser_conn->ib_conn.device;
 460         struct iser_tx_desc *tx_desc = &iser_pdu->desc;
 461
 462         if (iser_pdu->dir[ISER_DIR_IN]) {
 463                 iser_unreg_rdma_mem(iser_pdu, ISER_DIR_IN);
 464                 iser_dma_unmap_task_data(iser_pdu,
 465                                          &iser_pdu->data[ISER_DIR_IN],
 466                                          DMA_FROM_DEVICE);
 467         }
 468
 469         if (iser_pdu->dir[ISER_DIR_OUT]) {
 470                 iser_unreg_rdma_mem(iser_pdu, ISER_DIR_OUT);
 471                 iser_dma_unmap_task_data(iser_pdu,
 472                                          &iser_pdu->data[ISER_DIR_OUT],
 473                                          DMA_TO_DEVICE);
 474         }
 475
 476         if (likely(tx_desc->mapped)) {
 477                 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
 478                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
 479                 tx_desc->mapped = false;
 480         }
 481
 482         iser_pdu_free(ic, ip);
 483 }
 484
 485 static int
 486 iser_limits(struct icl_drv_limits *idl)
 487 {
 488         idl->idl_max_recv_data_segment_length = 128 * 1024;
 489
 490         return (0);
 491 }
 492
 493 static int
 494 icl_iser_load(void)
 495 {
 496         int error;
 497
 498         ISER_DBG("Starting iSER datamover...");
 499
 500         icl_pdu_zone = uma_zcreate("icl_iser_pdu", sizeof(struct icl_iser_pdu),
 501                                    NULL, NULL, NULL, NULL,
 502                                    UMA_ALIGN_PTR, 0);
 503         /* FIXME: Check rc */
 504
 505         refcount_init(&icl_iser_ncons, 0);
 506
 507         error = icl_register("iser", true, 0, iser_limits, iser_new_conn);
 508         KASSERT(error == 0, ("failed to register iser"));
 509
 510         memset(&ig, 0, sizeof(struct iser_global));
 511
 512         /* device init is called only after the first addr resolution */
 513         sx_init(&ig.device_list_mutex,  "global_device_lock");
 514         INIT_LIST_HEAD(&ig.device_list);
 515         mtx_init(&ig.connlist_mutex, "global_conn_lock", NULL, MTX_DEF);
 516         INIT_LIST_HEAD(&ig.connlist);
 517         sx_init(&ig.close_conns_mutex,  "global_close_conns_lock");
 518
 519         return (error);
 520 }
 521
 522 static int
 523 icl_iser_unload(void)
 524 {
 525         ISER_DBG("Removing iSER datamover...");
 526
 527         if (icl_iser_ncons != 0)
 528                 return (EBUSY);
 529
 530         sx_destroy(&ig.close_conns_mutex);
 531         mtx_destroy(&ig.connlist_mutex);
 532         sx_destroy(&ig.device_list_mutex);
 533
 534         icl_unregister("iser", true);
 535
 536         uma_zdestroy(icl_pdu_zone);
 537
 538         return (0);
 539 }
 540
 541 static int
 542 icl_iser_modevent(module_t mod, int what, void *arg)
 543 {
 544         switch (what) {
 545         case MOD_LOAD:
 546                 return (icl_iser_load());
 547         case MOD_UNLOAD:
 548                 return (icl_iser_unload());
 549         default:
 550                 return (EINVAL);
 551         }
 552 }
 553
 554 moduledata_t icl_iser_data = {
 555         .name = "icl_iser",
 556         .evhand = icl_iser_modevent,
 557         .priv = 0
 558 };
 559
 560 DECLARE_MODULE(icl_iser, icl_iser_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 561 MODULE_DEPEND(icl_iser, icl, 1, 1, 1);
 562 MODULE_DEPEND(icl_iser, ibcore, 1, 1, 1);
 563 MODULE_DEPEND(icl_iser, linuxkpi, 1, 1, 1);
 564 MODULE_VERSION(icl_iser, 1);