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