1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 4 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 #include <linux/kernel.h> 35 #include <linux/slab.h> 36 #include <linux/delay.h> 37 38 #include "iscsi_iser.h" 39 40 static void iser_qp_event_callback(struct ib_event *cause, void *context) 41 { 42 iser_err("qp event %s (%d)\n", 43 ib_event_msg(cause->event), cause->event); 44 } 45 46 static void iser_event_handler(struct ib_event_handler *handler, 47 struct ib_event *event) 48 { 49 iser_err("async event %s (%d) on device %s port %d\n", 50 ib_event_msg(event->event), event->event, 51 dev_name(&event->device->dev), event->element.port_num); 52 } 53 54 /* 55 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 56 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 57 * the adaptor. 58 * 59 * Return: 0 on success, -1 on failure 60 */ 61 static int iser_create_device_ib_res(struct iser_device *device) 62 { 63 struct ib_device *ib_dev = device->ib_device; 64 65 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) { 66 iser_err("IB device does not support memory registrations\n"); 67 return -1; 68 } 69 70 device->pd = ib_alloc_pd(ib_dev, 71 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); 72 if (IS_ERR(device->pd)) 73 goto pd_err; 74 75 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev, 76 iser_event_handler); 77 ib_register_event_handler(&device->event_handler); 78 return 0; 79 80 pd_err: 81 iser_err("failed to allocate an IB resource\n"); 82 return -1; 83 } 84 85 /* 86 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 87 * CQ and PD created with the device associated with the adaptor. 88 */ 89 static void iser_free_device_ib_res(struct iser_device *device) 90 { 91 ib_unregister_event_handler(&device->event_handler); 92 ib_dealloc_pd(device->pd); 93 94 device->pd = NULL; 95 } 96 97 static struct iser_fr_desc * 98 iser_create_fastreg_desc(struct iser_device *device, 99 struct ib_pd *pd, 100 bool pi_enable, 101 unsigned int size) 102 { 103 struct iser_fr_desc *desc; 104 struct ib_device *ib_dev = device->ib_device; 105 enum ib_mr_type mr_type; 106 int ret; 107 108 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 109 if (!desc) 110 return ERR_PTR(-ENOMEM); 111 112 if (ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG) 113 mr_type = IB_MR_TYPE_SG_GAPS; 114 else 115 mr_type = IB_MR_TYPE_MEM_REG; 116 117 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size); 118 if (IS_ERR(desc->rsc.mr)) { 119 ret = PTR_ERR(desc->rsc.mr); 120 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 121 goto err_alloc_mr; 122 } 123 124 if (pi_enable) { 125 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size); 126 if (IS_ERR(desc->rsc.sig_mr)) { 127 ret = PTR_ERR(desc->rsc.sig_mr); 128 iser_err("Failed to allocate sig_mr err=%d\n", ret); 129 goto err_alloc_mr_integrity; 130 } 131 } 132 desc->rsc.mr_valid = 0; 133 134 return desc; 135 136 err_alloc_mr_integrity: 137 ib_dereg_mr(desc->rsc.mr); 138 err_alloc_mr: 139 kfree(desc); 140 141 return ERR_PTR(ret); 142 } 143 144 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc) 145 { 146 struct iser_reg_resources *res = &desc->rsc; 147 148 ib_dereg_mr(res->mr); 149 if (res->sig_mr) { 150 ib_dereg_mr(res->sig_mr); 151 res->sig_mr = NULL; 152 } 153 kfree(desc); 154 } 155 156 /** 157 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 158 * for fast registration work requests. 159 * @ib_conn: connection RDMA resources 160 * @cmds_max: max number of SCSI commands for this connection 161 * @size: max number of pages per map request 162 * 163 * Return: 0 on success, or errno code on failure 164 */ 165 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 166 unsigned cmds_max, 167 unsigned int size) 168 { 169 struct iser_device *device = ib_conn->device; 170 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 171 struct iser_fr_desc *desc; 172 int i, ret; 173 174 INIT_LIST_HEAD(&fr_pool->list); 175 INIT_LIST_HEAD(&fr_pool->all_list); 176 spin_lock_init(&fr_pool->lock); 177 fr_pool->size = 0; 178 for (i = 0; i < cmds_max; i++) { 179 desc = iser_create_fastreg_desc(device, device->pd, 180 ib_conn->pi_support, size); 181 if (IS_ERR(desc)) { 182 ret = PTR_ERR(desc); 183 goto err; 184 } 185 186 list_add_tail(&desc->list, &fr_pool->list); 187 list_add_tail(&desc->all_list, &fr_pool->all_list); 188 fr_pool->size++; 189 } 190 191 return 0; 192 193 err: 194 iser_free_fastreg_pool(ib_conn); 195 return ret; 196 } 197 198 /** 199 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 200 * @ib_conn: connection RDMA resources 201 */ 202 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 203 { 204 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 205 struct iser_fr_desc *desc, *tmp; 206 int i = 0; 207 208 if (list_empty(&fr_pool->all_list)) 209 return; 210 211 iser_info("freeing conn %p fr pool\n", ib_conn); 212 213 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 214 list_del(&desc->all_list); 215 iser_destroy_fastreg_desc(desc); 216 ++i; 217 } 218 219 if (i < fr_pool->size) 220 iser_warn("pool still has %d regions registered\n", 221 fr_pool->size - i); 222 } 223 224 /* 225 * iser_create_ib_conn_res - Queue-Pair (QP) 226 * 227 * Return: 0 on success, -1 on failure 228 */ 229 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 230 { 231 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 232 struct iser_device *device; 233 struct ib_device *ib_dev; 234 struct ib_qp_init_attr init_attr; 235 int ret = -ENOMEM; 236 unsigned int max_send_wr, cq_size; 237 238 BUG_ON(ib_conn->device == NULL); 239 240 device = ib_conn->device; 241 ib_dev = device->ib_device; 242 243 /* +1 for drain */ 244 if (ib_conn->pi_support) 245 max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 246 else 247 max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 248 max_send_wr = min_t(unsigned int, max_send_wr, 249 (unsigned int)ib_dev->attrs.max_qp_wr); 250 251 cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS; 252 ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ); 253 if (IS_ERR(ib_conn->cq)) { 254 ret = PTR_ERR(ib_conn->cq); 255 goto cq_err; 256 } 257 ib_conn->cq_size = cq_size; 258 259 memset(&init_attr, 0, sizeof(init_attr)); 260 261 init_attr.event_handler = iser_qp_event_callback; 262 init_attr.qp_context = (void *)ib_conn; 263 init_attr.send_cq = ib_conn->cq; 264 init_attr.recv_cq = ib_conn->cq; 265 /* +1 for drain */ 266 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS + 1; 267 init_attr.cap.max_send_sge = 2; 268 init_attr.cap.max_recv_sge = 1; 269 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 270 init_attr.qp_type = IB_QPT_RC; 271 init_attr.cap.max_send_wr = max_send_wr; 272 if (ib_conn->pi_support) 273 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; 274 iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1); 275 276 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 277 if (ret) 278 goto out_err; 279 280 ib_conn->qp = ib_conn->cma_id->qp; 281 iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", ib_conn, 282 ib_conn->cma_id, ib_conn->cma_id->qp, max_send_wr); 283 return ret; 284 285 out_err: 286 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 287 cq_err: 288 iser_err("unable to alloc mem or create resource, err %d\n", ret); 289 290 return ret; 291 } 292 293 /* 294 * based on the resolved device node GUID see if there already allocated 295 * device for this device. If there's no such, create one. 296 */ 297 static 298 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 299 { 300 struct iser_device *device; 301 302 mutex_lock(&ig.device_list_mutex); 303 304 list_for_each_entry(device, &ig.device_list, ig_list) 305 /* find if there's a match using the node GUID */ 306 if (device->ib_device->node_guid == cma_id->device->node_guid) 307 goto inc_refcnt; 308 309 device = kzalloc(sizeof *device, GFP_KERNEL); 310 if (!device) 311 goto out; 312 313 /* assign this device to the device */ 314 device->ib_device = cma_id->device; 315 /* init the device and link it into ig device list */ 316 if (iser_create_device_ib_res(device)) { 317 kfree(device); 318 device = NULL; 319 goto out; 320 } 321 list_add(&device->ig_list, &ig.device_list); 322 323 inc_refcnt: 324 device->refcount++; 325 out: 326 mutex_unlock(&ig.device_list_mutex); 327 return device; 328 } 329 330 /* if there's no demand for this device, release it */ 331 static void iser_device_try_release(struct iser_device *device) 332 { 333 mutex_lock(&ig.device_list_mutex); 334 device->refcount--; 335 iser_info("device %p refcount %d\n", device, device->refcount); 336 if (!device->refcount) { 337 iser_free_device_ib_res(device); 338 list_del(&device->ig_list); 339 kfree(device); 340 } 341 mutex_unlock(&ig.device_list_mutex); 342 } 343 344 void iser_release_work(struct work_struct *work) 345 { 346 struct iser_conn *iser_conn; 347 348 iser_conn = container_of(work, struct iser_conn, release_work); 349 350 /* Wait for conn_stop to complete */ 351 wait_for_completion(&iser_conn->stop_completion); 352 /* Wait for IB resouces cleanup to complete */ 353 wait_for_completion(&iser_conn->ib_completion); 354 355 mutex_lock(&iser_conn->state_mutex); 356 iser_conn->state = ISER_CONN_DOWN; 357 mutex_unlock(&iser_conn->state_mutex); 358 359 iser_conn_release(iser_conn); 360 } 361 362 /** 363 * iser_free_ib_conn_res - release IB related resources 364 * @iser_conn: iser connection struct 365 * @destroy: indicator if we need to try to release the 366 * iser device and memory regoins pool (only iscsi 367 * shutdown and DEVICE_REMOVAL will use this). 368 * 369 * This routine is called with the iser state mutex held 370 * so the cm_id removal is out of here. It is Safe to 371 * be invoked multiple times. 372 */ 373 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, bool destroy) 374 { 375 struct ib_conn *ib_conn = &iser_conn->ib_conn; 376 struct iser_device *device = ib_conn->device; 377 378 iser_info("freeing conn %p cma_id %p qp %p\n", 379 iser_conn, ib_conn->cma_id, ib_conn->qp); 380 381 if (ib_conn->qp) { 382 rdma_destroy_qp(ib_conn->cma_id); 383 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 384 ib_conn->qp = NULL; 385 } 386 387 if (destroy) { 388 if (iser_conn->rx_descs) 389 iser_free_rx_descriptors(iser_conn); 390 391 if (device) { 392 iser_device_try_release(device); 393 ib_conn->device = NULL; 394 } 395 } 396 } 397 398 /** 399 * iser_conn_release - Frees all conn objects and deallocs conn descriptor 400 * @iser_conn: iSER connection context 401 */ 402 void iser_conn_release(struct iser_conn *iser_conn) 403 { 404 struct ib_conn *ib_conn = &iser_conn->ib_conn; 405 406 mutex_lock(&ig.connlist_mutex); 407 list_del(&iser_conn->conn_list); 408 mutex_unlock(&ig.connlist_mutex); 409 410 mutex_lock(&iser_conn->state_mutex); 411 /* In case we endup here without ep_disconnect being invoked. */ 412 if (iser_conn->state != ISER_CONN_DOWN) { 413 iser_warn("iser conn %p state %d, expected state down.\n", 414 iser_conn, iser_conn->state); 415 iscsi_destroy_endpoint(iser_conn->ep); 416 iser_conn->state = ISER_CONN_DOWN; 417 } 418 /* 419 * In case we never got to bind stage, we still need to 420 * release IB resources (which is safe to call more than once). 421 */ 422 iser_free_ib_conn_res(iser_conn, true); 423 mutex_unlock(&iser_conn->state_mutex); 424 425 if (ib_conn->cma_id) { 426 rdma_destroy_id(ib_conn->cma_id); 427 ib_conn->cma_id = NULL; 428 } 429 430 kfree(iser_conn); 431 } 432 433 /** 434 * iser_conn_terminate - triggers start of the disconnect procedures and 435 * waits for them to be done 436 * @iser_conn: iSER connection context 437 * 438 * Called with state mutex held 439 */ 440 int iser_conn_terminate(struct iser_conn *iser_conn) 441 { 442 struct ib_conn *ib_conn = &iser_conn->ib_conn; 443 int err = 0; 444 445 lockdep_assert_held(&iser_conn->state_mutex); 446 447 /* terminate the iser conn only if the conn state is UP */ 448 if (iser_conn->state != ISER_CONN_UP) 449 return 0; 450 451 iser_conn->state = ISER_CONN_TERMINATING; 452 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 453 454 /* suspend queuing of new iscsi commands */ 455 if (iser_conn->iscsi_conn) 456 iscsi_suspend_queue(iser_conn->iscsi_conn); 457 458 /* 459 * In case we didn't already clean up the cma_id (peer initiated 460 * a disconnection), we need to Cause the CMA to change the QP 461 * state to ERROR. 462 */ 463 if (ib_conn->cma_id) { 464 err = rdma_disconnect(ib_conn->cma_id); 465 if (err) 466 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 467 iser_conn, err); 468 469 /* block until all flush errors are consumed */ 470 ib_drain_qp(ib_conn->qp); 471 } 472 473 return 1; 474 } 475 476 /* 477 * Called with state mutex held 478 */ 479 static void iser_connect_error(struct rdma_cm_id *cma_id) 480 { 481 struct iser_conn *iser_conn = cma_id->context; 482 483 lockdep_assert_held(&iser_conn->state_mutex); 484 485 iser_conn->state = ISER_CONN_TERMINATING; 486 } 487 488 static void iser_calc_scsi_params(struct iser_conn *iser_conn, 489 unsigned int max_sectors) 490 { 491 struct iser_device *device = iser_conn->ib_conn.device; 492 struct ib_device_attr *attr = &device->ib_device->attrs; 493 unsigned short sg_tablesize, sup_sg_tablesize; 494 unsigned short reserved_mr_pages; 495 u32 max_num_sg; 496 497 /* 498 * FRs without SG_GAPS can only map up to a (device) page per entry, 499 * but if the first entry is misaligned we'll end up using two entries 500 * (head and tail) for a single page worth data, so one additional 501 * entry is required. 502 */ 503 if (attr->kernel_cap_flags & IBK_SG_GAPS_REG) 504 reserved_mr_pages = 0; 505 else 506 reserved_mr_pages = 1; 507 508 if (iser_conn->ib_conn.pi_support) 509 max_num_sg = attr->max_pi_fast_reg_page_list_len; 510 else 511 max_num_sg = attr->max_fast_reg_page_list_len; 512 513 sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K); 514 sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE, 515 max_num_sg - reserved_mr_pages); 516 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 517 iser_conn->pages_per_mr = 518 iser_conn->scsi_sg_tablesize + reserved_mr_pages; 519 } 520 521 /* 522 * Called with state mutex held 523 */ 524 static void iser_addr_handler(struct rdma_cm_id *cma_id) 525 { 526 struct iser_conn *iser_conn = cma_id->context; 527 struct iser_device *device; 528 struct ib_conn *ib_conn; 529 int ret; 530 531 lockdep_assert_held(&iser_conn->state_mutex); 532 533 if (iser_conn->state != ISER_CONN_PENDING) 534 /* bailout */ 535 return; 536 537 ib_conn = &iser_conn->ib_conn; 538 device = iser_device_find_by_ib_device(cma_id); 539 if (!device) { 540 iser_err("device lookup/creation failed\n"); 541 iser_connect_error(cma_id); 542 return; 543 } 544 545 ib_conn->device = device; 546 547 /* connection T10-PI support */ 548 if (iser_pi_enable) { 549 if (!(device->ib_device->attrs.kernel_cap_flags & 550 IBK_INTEGRITY_HANDOVER)) { 551 iser_warn("T10-PI requested but not supported on %s, " 552 "continue without T10-PI\n", 553 dev_name(&ib_conn->device->ib_device->dev)); 554 ib_conn->pi_support = false; 555 } else { 556 ib_conn->pi_support = true; 557 } 558 } 559 560 iser_calc_scsi_params(iser_conn, iser_max_sectors); 561 562 ret = rdma_resolve_route(cma_id, 1000); 563 if (ret) { 564 iser_err("resolve route failed: %d\n", ret); 565 iser_connect_error(cma_id); 566 return; 567 } 568 } 569 570 /* 571 * Called with state mutex held 572 */ 573 static void iser_route_handler(struct rdma_cm_id *cma_id) 574 { 575 struct rdma_conn_param conn_param; 576 int ret; 577 struct iser_cm_hdr req_hdr; 578 struct iser_conn *iser_conn = cma_id->context; 579 struct ib_conn *ib_conn = &iser_conn->ib_conn; 580 struct ib_device *ib_dev = ib_conn->device->ib_device; 581 582 lockdep_assert_held(&iser_conn->state_mutex); 583 584 if (iser_conn->state != ISER_CONN_PENDING) 585 /* bailout */ 586 return; 587 588 ret = iser_create_ib_conn_res(ib_conn); 589 if (ret) 590 goto failure; 591 592 memset(&conn_param, 0, sizeof conn_param); 593 conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom; 594 conn_param.initiator_depth = 1; 595 conn_param.retry_count = 7; 596 conn_param.rnr_retry_count = 6; 597 598 memset(&req_hdr, 0, sizeof(req_hdr)); 599 req_hdr.flags = ISER_ZBVA_NOT_SUP; 600 if (!iser_always_reg) 601 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 602 conn_param.private_data = (void *)&req_hdr; 603 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 604 605 ret = rdma_connect_locked(cma_id, &conn_param); 606 if (ret) { 607 iser_err("failure connecting: %d\n", ret); 608 goto failure; 609 } 610 611 return; 612 failure: 613 iser_connect_error(cma_id); 614 } 615 616 /* 617 * Called with state mutex held 618 */ 619 static void iser_connected_handler(struct rdma_cm_id *cma_id, 620 const void *private_data) 621 { 622 struct iser_conn *iser_conn = cma_id->context; 623 struct ib_qp_attr attr; 624 struct ib_qp_init_attr init_attr; 625 626 lockdep_assert_held(&iser_conn->state_mutex); 627 628 if (iser_conn->state != ISER_CONN_PENDING) 629 /* bailout */ 630 return; 631 632 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 633 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 634 635 if (private_data) { 636 u8 flags = *(u8 *)private_data; 637 638 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 639 } 640 641 iser_info("conn %p: negotiated %s invalidation\n", 642 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 643 644 iser_conn->state = ISER_CONN_UP; 645 complete(&iser_conn->up_completion); 646 } 647 648 /* 649 * Called with state mutex held 650 */ 651 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 652 bool destroy) 653 { 654 struct iser_conn *iser_conn = cma_id->context; 655 656 lockdep_assert_held(&iser_conn->state_mutex); 657 /* 658 * We are not guaranteed that we visited disconnected_handler 659 * by now, call it here to be safe that we handle CM drep 660 * and flush errors. 661 */ 662 if (iser_conn_terminate(iser_conn)) { 663 if (iser_conn->iscsi_conn) 664 iscsi_conn_failure(iser_conn->iscsi_conn, 665 ISCSI_ERR_CONN_FAILED); 666 else 667 iser_err("iscsi_iser connection isn't bound\n"); 668 } 669 iser_free_ib_conn_res(iser_conn, destroy); 670 complete(&iser_conn->ib_completion); 671 } 672 673 static int iser_cma_handler(struct rdma_cm_id *cma_id, 674 struct rdma_cm_event *event) 675 { 676 struct iser_conn *iser_conn; 677 int ret = 0; 678 679 iser_conn = cma_id->context; 680 iser_info("%s (%d): status %d conn %p id %p\n", 681 rdma_event_msg(event->event), event->event, 682 event->status, cma_id->context, cma_id); 683 684 mutex_lock(&iser_conn->state_mutex); 685 switch (event->event) { 686 case RDMA_CM_EVENT_ADDR_RESOLVED: 687 iser_addr_handler(cma_id); 688 break; 689 case RDMA_CM_EVENT_ROUTE_RESOLVED: 690 iser_route_handler(cma_id); 691 break; 692 case RDMA_CM_EVENT_ESTABLISHED: 693 iser_connected_handler(cma_id, event->param.conn.private_data); 694 break; 695 case RDMA_CM_EVENT_REJECTED: 696 iser_info("Connection rejected: %s\n", 697 rdma_reject_msg(cma_id, event->status)); 698 fallthrough; 699 case RDMA_CM_EVENT_ADDR_ERROR: 700 case RDMA_CM_EVENT_ROUTE_ERROR: 701 case RDMA_CM_EVENT_CONNECT_ERROR: 702 case RDMA_CM_EVENT_UNREACHABLE: 703 iser_connect_error(cma_id); 704 break; 705 case RDMA_CM_EVENT_DISCONNECTED: 706 case RDMA_CM_EVENT_ADDR_CHANGE: 707 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 708 iser_cleanup_handler(cma_id, false); 709 break; 710 case RDMA_CM_EVENT_DEVICE_REMOVAL: 711 /* 712 * we *must* destroy the device as we cannot rely 713 * on iscsid to be around to initiate error handling. 714 * also if we are not in state DOWN implicitly destroy 715 * the cma_id. 716 */ 717 iser_cleanup_handler(cma_id, true); 718 if (iser_conn->state != ISER_CONN_DOWN) { 719 iser_conn->ib_conn.cma_id = NULL; 720 ret = 1; 721 } 722 break; 723 default: 724 iser_err("Unexpected RDMA CM event: %s (%d)\n", 725 rdma_event_msg(event->event), event->event); 726 break; 727 } 728 mutex_unlock(&iser_conn->state_mutex); 729 730 return ret; 731 } 732 733 void iser_conn_init(struct iser_conn *iser_conn) 734 { 735 struct ib_conn *ib_conn = &iser_conn->ib_conn; 736 737 iser_conn->state = ISER_CONN_INIT; 738 init_completion(&iser_conn->stop_completion); 739 init_completion(&iser_conn->ib_completion); 740 init_completion(&iser_conn->up_completion); 741 INIT_LIST_HEAD(&iser_conn->conn_list); 742 mutex_init(&iser_conn->state_mutex); 743 744 ib_conn->reg_cqe.done = iser_reg_comp; 745 } 746 747 /* 748 * starts the process of connecting to the target 749 * sleeps until the connection is established or rejected 750 */ 751 int iser_connect(struct iser_conn *iser_conn, struct sockaddr *src_addr, 752 struct sockaddr *dst_addr, int non_blocking) 753 { 754 struct ib_conn *ib_conn = &iser_conn->ib_conn; 755 int err = 0; 756 757 mutex_lock(&iser_conn->state_mutex); 758 759 sprintf(iser_conn->name, "%pISp", dst_addr); 760 761 iser_info("connecting to: %s\n", iser_conn->name); 762 763 /* the device is known only --after-- address resolution */ 764 ib_conn->device = NULL; 765 766 iser_conn->state = ISER_CONN_PENDING; 767 768 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 769 iser_conn, RDMA_PS_TCP, IB_QPT_RC); 770 if (IS_ERR(ib_conn->cma_id)) { 771 err = PTR_ERR(ib_conn->cma_id); 772 iser_err("rdma_create_id failed: %d\n", err); 773 goto id_failure; 774 } 775 776 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 777 if (err) { 778 iser_err("rdma_resolve_addr failed: %d\n", err); 779 goto addr_failure; 780 } 781 782 if (!non_blocking) { 783 wait_for_completion_interruptible(&iser_conn->up_completion); 784 785 if (iser_conn->state != ISER_CONN_UP) { 786 err = -EIO; 787 goto connect_failure; 788 } 789 } 790 mutex_unlock(&iser_conn->state_mutex); 791 792 mutex_lock(&ig.connlist_mutex); 793 list_add(&iser_conn->conn_list, &ig.connlist); 794 mutex_unlock(&ig.connlist_mutex); 795 return 0; 796 797 id_failure: 798 ib_conn->cma_id = NULL; 799 addr_failure: 800 iser_conn->state = ISER_CONN_DOWN; 801 connect_failure: 802 mutex_unlock(&iser_conn->state_mutex); 803 iser_conn_release(iser_conn); 804 return err; 805 } 806 807 int iser_post_recvl(struct iser_conn *iser_conn) 808 { 809 struct ib_conn *ib_conn = &iser_conn->ib_conn; 810 struct iser_login_desc *desc = &iser_conn->login_desc; 811 struct ib_recv_wr wr; 812 int ret; 813 814 desc->sge.addr = desc->rsp_dma; 815 desc->sge.length = ISER_RX_LOGIN_SIZE; 816 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 817 818 desc->cqe.done = iser_login_rsp; 819 wr.wr_cqe = &desc->cqe; 820 wr.sg_list = &desc->sge; 821 wr.num_sge = 1; 822 wr.next = NULL; 823 824 ret = ib_post_recv(ib_conn->qp, &wr, NULL); 825 if (unlikely(ret)) 826 iser_err("ib_post_recv login failed ret=%d\n", ret); 827 828 return ret; 829 } 830 831 int iser_post_recvm(struct iser_conn *iser_conn, struct iser_rx_desc *rx_desc) 832 { 833 struct ib_conn *ib_conn = &iser_conn->ib_conn; 834 struct ib_recv_wr wr; 835 int ret; 836 837 rx_desc->cqe.done = iser_task_rsp; 838 wr.wr_cqe = &rx_desc->cqe; 839 wr.sg_list = &rx_desc->rx_sg; 840 wr.num_sge = 1; 841 wr.next = NULL; 842 843 ret = ib_post_recv(ib_conn->qp, &wr, NULL); 844 if (unlikely(ret)) 845 iser_err("ib_post_recv failed ret=%d\n", ret); 846 847 return ret; 848 } 849 850 851 /** 852 * iser_post_send - Initiate a Send DTO operation 853 * @ib_conn: connection RDMA resources 854 * @tx_desc: iSER TX descriptor 855 * 856 * Return: 0 on success, -1 on failure 857 */ 858 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc) 859 { 860 struct ib_send_wr *wr = &tx_desc->send_wr; 861 struct ib_send_wr *first_wr; 862 int ret; 863 864 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 865 tx_desc->dma_addr, ISER_HEADERS_LEN, 866 DMA_TO_DEVICE); 867 868 wr->next = NULL; 869 wr->wr_cqe = &tx_desc->cqe; 870 wr->sg_list = tx_desc->tx_sg; 871 wr->num_sge = tx_desc->num_sge; 872 wr->opcode = IB_WR_SEND; 873 wr->send_flags = IB_SEND_SIGNALED; 874 875 if (tx_desc->inv_wr.next) 876 first_wr = &tx_desc->inv_wr; 877 else if (tx_desc->reg_wr.wr.next) 878 first_wr = &tx_desc->reg_wr.wr; 879 else 880 first_wr = wr; 881 882 ret = ib_post_send(ib_conn->qp, first_wr, NULL); 883 if (unlikely(ret)) 884 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 885 ret, wr->opcode); 886 887 return ret; 888 } 889 890 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 891 enum iser_data_dir cmd_dir, sector_t *sector) 892 { 893 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 894 struct iser_fr_desc *desc = reg->desc; 895 unsigned long sector_size = iser_task->sc->device->sector_size; 896 struct ib_mr_status mr_status; 897 int ret; 898 899 if (desc && desc->sig_protected) { 900 desc->sig_protected = false; 901 ret = ib_check_mr_status(desc->rsc.sig_mr, 902 IB_MR_CHECK_SIG_STATUS, &mr_status); 903 if (ret) { 904 iser_err("ib_check_mr_status failed, ret %d\n", ret); 905 /* Not a lot we can do, return ambiguous guard error */ 906 *sector = 0; 907 return 0x1; 908 } 909 910 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 911 sector_t sector_off = mr_status.sig_err.sig_err_offset; 912 913 sector_div(sector_off, sector_size + 8); 914 *sector = scsi_get_sector(iser_task->sc) + sector_off; 915 916 iser_err("PI error found type %d at sector %llx " 917 "expected %x vs actual %x\n", 918 mr_status.sig_err.err_type, 919 (unsigned long long)*sector, 920 mr_status.sig_err.expected, 921 mr_status.sig_err.actual); 922 923 switch (mr_status.sig_err.err_type) { 924 case IB_SIG_BAD_GUARD: 925 return 0x1; 926 case IB_SIG_BAD_REFTAG: 927 return 0x3; 928 case IB_SIG_BAD_APPTAG: 929 return 0x2; 930 } 931 } 932 } 933 934 return 0; 935 } 936 937 void iser_err_comp(struct ib_wc *wc, const char *type) 938 { 939 if (wc->status != IB_WC_WR_FLUSH_ERR) { 940 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 941 942 iser_err("%s failure: %s (%d) vend_err %#x\n", type, 943 ib_wc_status_msg(wc->status), wc->status, 944 wc->vendor_err); 945 946 if (iser_conn->iscsi_conn) 947 iscsi_conn_failure(iser_conn->iscsi_conn, 948 ISCSI_ERR_CONN_FAILED); 949 } else { 950 iser_dbg("%s failure: %s (%d)\n", type, 951 ib_wc_status_msg(wc->status), wc->status); 952 } 953 } 954