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 #define ISCSI_ISER_MAX_CONN 8 41 #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) 42 #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) 43 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \ 44 ISCSI_ISER_MAX_CONN) 45 46 static void iser_qp_event_callback(struct ib_event *cause, void *context) 47 { 48 iser_err("qp event %s (%d)\n", 49 ib_event_msg(cause->event), cause->event); 50 } 51 52 static void iser_event_handler(struct ib_event_handler *handler, 53 struct ib_event *event) 54 { 55 iser_err("async event %s (%d) on device %s port %d\n", 56 ib_event_msg(event->event), event->event, 57 dev_name(&event->device->dev), event->element.port_num); 58 } 59 60 /* 61 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 62 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 63 * the adaptor. 64 * 65 * Return: 0 on success, -1 on failure 66 */ 67 static int iser_create_device_ib_res(struct iser_device *device) 68 { 69 struct ib_device *ib_dev = device->ib_device; 70 71 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) { 72 iser_err("IB device does not support memory registrations\n"); 73 return -1; 74 } 75 76 device->pd = ib_alloc_pd(ib_dev, 77 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); 78 if (IS_ERR(device->pd)) 79 goto pd_err; 80 81 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev, 82 iser_event_handler); 83 ib_register_event_handler(&device->event_handler); 84 return 0; 85 86 pd_err: 87 iser_err("failed to allocate an IB resource\n"); 88 return -1; 89 } 90 91 /* 92 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 93 * CQ and PD created with the device associated with the adaptor. 94 */ 95 static void iser_free_device_ib_res(struct iser_device *device) 96 { 97 ib_unregister_event_handler(&device->event_handler); 98 ib_dealloc_pd(device->pd); 99 100 device->pd = NULL; 101 } 102 103 static struct iser_fr_desc * 104 iser_create_fastreg_desc(struct iser_device *device, 105 struct ib_pd *pd, 106 bool pi_enable, 107 unsigned int size) 108 { 109 struct iser_fr_desc *desc; 110 struct ib_device *ib_dev = device->ib_device; 111 enum ib_mr_type mr_type; 112 int ret; 113 114 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 115 if (!desc) 116 return ERR_PTR(-ENOMEM); 117 118 if (ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG) 119 mr_type = IB_MR_TYPE_SG_GAPS; 120 else 121 mr_type = IB_MR_TYPE_MEM_REG; 122 123 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size); 124 if (IS_ERR(desc->rsc.mr)) { 125 ret = PTR_ERR(desc->rsc.mr); 126 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 127 goto err_alloc_mr; 128 } 129 130 if (pi_enable) { 131 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size); 132 if (IS_ERR(desc->rsc.sig_mr)) { 133 ret = PTR_ERR(desc->rsc.sig_mr); 134 iser_err("Failed to allocate sig_mr err=%d\n", ret); 135 goto err_alloc_mr_integrity; 136 } 137 } 138 desc->rsc.mr_valid = 0; 139 140 return desc; 141 142 err_alloc_mr_integrity: 143 ib_dereg_mr(desc->rsc.mr); 144 err_alloc_mr: 145 kfree(desc); 146 147 return ERR_PTR(ret); 148 } 149 150 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc) 151 { 152 struct iser_reg_resources *res = &desc->rsc; 153 154 ib_dereg_mr(res->mr); 155 if (res->sig_mr) { 156 ib_dereg_mr(res->sig_mr); 157 res->sig_mr = NULL; 158 } 159 kfree(desc); 160 } 161 162 /** 163 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 164 * for fast registration work requests. 165 * @ib_conn: connection RDMA resources 166 * @cmds_max: max number of SCSI commands for this connection 167 * @size: max number of pages per map request 168 * 169 * Return: 0 on success, or errno code on failure 170 */ 171 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 172 unsigned cmds_max, 173 unsigned int size) 174 { 175 struct iser_device *device = ib_conn->device; 176 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 177 struct iser_fr_desc *desc; 178 int i, ret; 179 180 INIT_LIST_HEAD(&fr_pool->list); 181 INIT_LIST_HEAD(&fr_pool->all_list); 182 spin_lock_init(&fr_pool->lock); 183 fr_pool->size = 0; 184 for (i = 0; i < cmds_max; i++) { 185 desc = iser_create_fastreg_desc(device, device->pd, 186 ib_conn->pi_support, size); 187 if (IS_ERR(desc)) { 188 ret = PTR_ERR(desc); 189 goto err; 190 } 191 192 list_add_tail(&desc->list, &fr_pool->list); 193 list_add_tail(&desc->all_list, &fr_pool->all_list); 194 fr_pool->size++; 195 } 196 197 return 0; 198 199 err: 200 iser_free_fastreg_pool(ib_conn); 201 return ret; 202 } 203 204 /** 205 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 206 * @ib_conn: connection RDMA resources 207 */ 208 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 209 { 210 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 211 struct iser_fr_desc *desc, *tmp; 212 int i = 0; 213 214 if (list_empty(&fr_pool->all_list)) 215 return; 216 217 iser_info("freeing conn %p fr pool\n", ib_conn); 218 219 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 220 list_del(&desc->all_list); 221 iser_destroy_fastreg_desc(desc); 222 ++i; 223 } 224 225 if (i < fr_pool->size) 226 iser_warn("pool still has %d regions registered\n", 227 fr_pool->size - i); 228 } 229 230 /* 231 * iser_create_ib_conn_res - Queue-Pair (QP) 232 * 233 * Return: 0 on success, -1 on failure 234 */ 235 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 236 { 237 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 238 struct iser_device *device; 239 struct ib_device *ib_dev; 240 struct ib_qp_init_attr init_attr; 241 int ret = -ENOMEM; 242 unsigned int max_send_wr, cq_size; 243 244 BUG_ON(ib_conn->device == NULL); 245 246 device = ib_conn->device; 247 ib_dev = device->ib_device; 248 249 if (ib_conn->pi_support) 250 max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 251 else 252 max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 253 max_send_wr = min_t(unsigned int, max_send_wr, 254 (unsigned int)ib_dev->attrs.max_qp_wr); 255 256 cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS; 257 ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ); 258 if (IS_ERR(ib_conn->cq)) { 259 ret = PTR_ERR(ib_conn->cq); 260 goto cq_err; 261 } 262 ib_conn->cq_size = cq_size; 263 264 memset(&init_attr, 0, sizeof(init_attr)); 265 266 init_attr.event_handler = iser_qp_event_callback; 267 init_attr.qp_context = (void *)ib_conn; 268 init_attr.send_cq = ib_conn->cq; 269 init_attr.recv_cq = ib_conn->cq; 270 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 271 init_attr.cap.max_send_sge = 2; 272 init_attr.cap.max_recv_sge = 1; 273 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 274 init_attr.qp_type = IB_QPT_RC; 275 init_attr.cap.max_send_wr = max_send_wr; 276 if (ib_conn->pi_support) 277 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; 278 iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1); 279 280 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 281 if (ret) 282 goto out_err; 283 284 ib_conn->qp = ib_conn->cma_id->qp; 285 iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", ib_conn, 286 ib_conn->cma_id, ib_conn->cma_id->qp, max_send_wr); 287 return ret; 288 289 out_err: 290 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 291 cq_err: 292 iser_err("unable to alloc mem or create resource, err %d\n", ret); 293 294 return ret; 295 } 296 297 /* 298 * based on the resolved device node GUID see if there already allocated 299 * device for this device. If there's no such, create one. 300 */ 301 static 302 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 303 { 304 struct iser_device *device; 305 306 mutex_lock(&ig.device_list_mutex); 307 308 list_for_each_entry(device, &ig.device_list, ig_list) 309 /* find if there's a match using the node GUID */ 310 if (device->ib_device->node_guid == cma_id->device->node_guid) 311 goto inc_refcnt; 312 313 device = kzalloc(sizeof *device, GFP_KERNEL); 314 if (!device) 315 goto out; 316 317 /* assign this device to the device */ 318 device->ib_device = cma_id->device; 319 /* init the device and link it into ig device list */ 320 if (iser_create_device_ib_res(device)) { 321 kfree(device); 322 device = NULL; 323 goto out; 324 } 325 list_add(&device->ig_list, &ig.device_list); 326 327 inc_refcnt: 328 device->refcount++; 329 out: 330 mutex_unlock(&ig.device_list_mutex); 331 return device; 332 } 333 334 /* if there's no demand for this device, release it */ 335 static void iser_device_try_release(struct iser_device *device) 336 { 337 mutex_lock(&ig.device_list_mutex); 338 device->refcount--; 339 iser_info("device %p refcount %d\n", device, device->refcount); 340 if (!device->refcount) { 341 iser_free_device_ib_res(device); 342 list_del(&device->ig_list); 343 kfree(device); 344 } 345 mutex_unlock(&ig.device_list_mutex); 346 } 347 348 /* 349 * Called with state mutex held 350 */ 351 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, 352 enum iser_conn_state comp, 353 enum iser_conn_state exch) 354 { 355 int ret; 356 357 ret = (iser_conn->state == comp); 358 if (ret) 359 iser_conn->state = exch; 360 361 return ret; 362 } 363 364 void iser_release_work(struct work_struct *work) 365 { 366 struct iser_conn *iser_conn; 367 368 iser_conn = container_of(work, struct iser_conn, release_work); 369 370 /* Wait for conn_stop to complete */ 371 wait_for_completion(&iser_conn->stop_completion); 372 /* Wait for IB resouces cleanup to complete */ 373 wait_for_completion(&iser_conn->ib_completion); 374 375 mutex_lock(&iser_conn->state_mutex); 376 iser_conn->state = ISER_CONN_DOWN; 377 mutex_unlock(&iser_conn->state_mutex); 378 379 iser_conn_release(iser_conn); 380 } 381 382 /** 383 * iser_free_ib_conn_res - release IB related resources 384 * @iser_conn: iser connection struct 385 * @destroy: indicator if we need to try to release the 386 * iser device and memory regoins pool (only iscsi 387 * shutdown and DEVICE_REMOVAL will use this). 388 * 389 * This routine is called with the iser state mutex held 390 * so the cm_id removal is out of here. It is Safe to 391 * be invoked multiple times. 392 */ 393 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, bool destroy) 394 { 395 struct ib_conn *ib_conn = &iser_conn->ib_conn; 396 struct iser_device *device = ib_conn->device; 397 398 iser_info("freeing conn %p cma_id %p qp %p\n", 399 iser_conn, ib_conn->cma_id, ib_conn->qp); 400 401 if (ib_conn->qp) { 402 rdma_destroy_qp(ib_conn->cma_id); 403 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 404 ib_conn->qp = NULL; 405 } 406 407 if (destroy) { 408 if (iser_conn->rx_descs) 409 iser_free_rx_descriptors(iser_conn); 410 411 if (device) { 412 iser_device_try_release(device); 413 ib_conn->device = NULL; 414 } 415 } 416 } 417 418 /** 419 * iser_conn_release - Frees all conn objects and deallocs conn descriptor 420 * @iser_conn: iSER connection context 421 */ 422 void iser_conn_release(struct iser_conn *iser_conn) 423 { 424 struct ib_conn *ib_conn = &iser_conn->ib_conn; 425 426 mutex_lock(&ig.connlist_mutex); 427 list_del(&iser_conn->conn_list); 428 mutex_unlock(&ig.connlist_mutex); 429 430 mutex_lock(&iser_conn->state_mutex); 431 /* In case we endup here without ep_disconnect being invoked. */ 432 if (iser_conn->state != ISER_CONN_DOWN) { 433 iser_warn("iser conn %p state %d, expected state down.\n", 434 iser_conn, iser_conn->state); 435 iscsi_destroy_endpoint(iser_conn->ep); 436 iser_conn->state = ISER_CONN_DOWN; 437 } 438 /* 439 * In case we never got to bind stage, we still need to 440 * release IB resources (which is safe to call more than once). 441 */ 442 iser_free_ib_conn_res(iser_conn, true); 443 mutex_unlock(&iser_conn->state_mutex); 444 445 if (ib_conn->cma_id) { 446 rdma_destroy_id(ib_conn->cma_id); 447 ib_conn->cma_id = NULL; 448 } 449 450 kfree(iser_conn); 451 } 452 453 /** 454 * iser_conn_terminate - triggers start of the disconnect procedures and 455 * waits for them to be done 456 * @iser_conn: iSER connection context 457 * 458 * Called with state mutex held 459 */ 460 int iser_conn_terminate(struct iser_conn *iser_conn) 461 { 462 struct ib_conn *ib_conn = &iser_conn->ib_conn; 463 int err = 0; 464 465 /* terminate the iser conn only if the conn state is UP */ 466 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, 467 ISER_CONN_TERMINATING)) 468 return 0; 469 470 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 471 472 /* suspend queuing of new iscsi commands */ 473 if (iser_conn->iscsi_conn) 474 iscsi_suspend_queue(iser_conn->iscsi_conn); 475 476 /* 477 * In case we didn't already clean up the cma_id (peer initiated 478 * a disconnection), we need to Cause the CMA to change the QP 479 * state to ERROR. 480 */ 481 if (ib_conn->cma_id) { 482 err = rdma_disconnect(ib_conn->cma_id); 483 if (err) 484 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 485 iser_conn, err); 486 487 /* block until all flush errors are consumed */ 488 ib_drain_sq(ib_conn->qp); 489 } 490 491 return 1; 492 } 493 494 /* 495 * Called with state mutex held 496 */ 497 static void iser_connect_error(struct rdma_cm_id *cma_id) 498 { 499 struct iser_conn *iser_conn; 500 501 iser_conn = cma_id->context; 502 iser_conn->state = ISER_CONN_TERMINATING; 503 } 504 505 static void iser_calc_scsi_params(struct iser_conn *iser_conn, 506 unsigned int max_sectors) 507 { 508 struct iser_device *device = iser_conn->ib_conn.device; 509 struct ib_device_attr *attr = &device->ib_device->attrs; 510 unsigned short sg_tablesize, sup_sg_tablesize; 511 unsigned short reserved_mr_pages; 512 u32 max_num_sg; 513 514 /* 515 * FRs without SG_GAPS can only map up to a (device) page per entry, 516 * but if the first entry is misaligned we'll end up using two entries 517 * (head and tail) for a single page worth data, so one additional 518 * entry is required. 519 */ 520 if (attr->kernel_cap_flags & IBK_SG_GAPS_REG) 521 reserved_mr_pages = 0; 522 else 523 reserved_mr_pages = 1; 524 525 if (iser_conn->ib_conn.pi_support) 526 max_num_sg = attr->max_pi_fast_reg_page_list_len; 527 else 528 max_num_sg = attr->max_fast_reg_page_list_len; 529 530 sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K); 531 sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE, 532 max_num_sg - reserved_mr_pages); 533 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 534 iser_conn->pages_per_mr = 535 iser_conn->scsi_sg_tablesize + reserved_mr_pages; 536 } 537 538 /* 539 * Called with state mutex held 540 */ 541 static void iser_addr_handler(struct rdma_cm_id *cma_id) 542 { 543 struct iser_device *device; 544 struct iser_conn *iser_conn; 545 struct ib_conn *ib_conn; 546 int ret; 547 548 iser_conn = cma_id->context; 549 if (iser_conn->state != ISER_CONN_PENDING) 550 /* bailout */ 551 return; 552 553 ib_conn = &iser_conn->ib_conn; 554 device = iser_device_find_by_ib_device(cma_id); 555 if (!device) { 556 iser_err("device lookup/creation failed\n"); 557 iser_connect_error(cma_id); 558 return; 559 } 560 561 ib_conn->device = device; 562 563 /* connection T10-PI support */ 564 if (iser_pi_enable) { 565 if (!(device->ib_device->attrs.kernel_cap_flags & 566 IBK_INTEGRITY_HANDOVER)) { 567 iser_warn("T10-PI requested but not supported on %s, " 568 "continue without T10-PI\n", 569 dev_name(&ib_conn->device->ib_device->dev)); 570 ib_conn->pi_support = false; 571 } else { 572 ib_conn->pi_support = true; 573 } 574 } 575 576 iser_calc_scsi_params(iser_conn, iser_max_sectors); 577 578 ret = rdma_resolve_route(cma_id, 1000); 579 if (ret) { 580 iser_err("resolve route failed: %d\n", ret); 581 iser_connect_error(cma_id); 582 return; 583 } 584 } 585 586 /* 587 * Called with state mutex held 588 */ 589 static void iser_route_handler(struct rdma_cm_id *cma_id) 590 { 591 struct rdma_conn_param conn_param; 592 int ret; 593 struct iser_cm_hdr req_hdr; 594 struct iser_conn *iser_conn = cma_id->context; 595 struct ib_conn *ib_conn = &iser_conn->ib_conn; 596 struct ib_device *ib_dev = ib_conn->device->ib_device; 597 598 if (iser_conn->state != ISER_CONN_PENDING) 599 /* bailout */ 600 return; 601 602 ret = iser_create_ib_conn_res(ib_conn); 603 if (ret) 604 goto failure; 605 606 memset(&conn_param, 0, sizeof conn_param); 607 conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom; 608 conn_param.initiator_depth = 1; 609 conn_param.retry_count = 7; 610 conn_param.rnr_retry_count = 6; 611 612 memset(&req_hdr, 0, sizeof(req_hdr)); 613 req_hdr.flags = ISER_ZBVA_NOT_SUP; 614 if (!iser_always_reg) 615 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 616 conn_param.private_data = (void *)&req_hdr; 617 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 618 619 ret = rdma_connect_locked(cma_id, &conn_param); 620 if (ret) { 621 iser_err("failure connecting: %d\n", ret); 622 goto failure; 623 } 624 625 return; 626 failure: 627 iser_connect_error(cma_id); 628 } 629 630 static void iser_connected_handler(struct rdma_cm_id *cma_id, 631 const void *private_data) 632 { 633 struct iser_conn *iser_conn; 634 struct ib_qp_attr attr; 635 struct ib_qp_init_attr init_attr; 636 637 iser_conn = cma_id->context; 638 if (iser_conn->state != ISER_CONN_PENDING) 639 /* bailout */ 640 return; 641 642 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 643 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 644 645 if (private_data) { 646 u8 flags = *(u8 *)private_data; 647 648 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 649 } 650 651 iser_info("conn %p: negotiated %s invalidation\n", 652 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 653 654 iser_conn->state = ISER_CONN_UP; 655 complete(&iser_conn->up_completion); 656 } 657 658 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 659 { 660 struct iser_conn *iser_conn = cma_id->context; 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 } 670 671 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 672 bool destroy) 673 { 674 struct iser_conn *iser_conn = cma_id->context; 675 676 /* 677 * We are not guaranteed that we visited disconnected_handler 678 * by now, call it here to be safe that we handle CM drep 679 * and flush errors. 680 */ 681 iser_disconnected_handler(cma_id); 682 iser_free_ib_conn_res(iser_conn, destroy); 683 complete(&iser_conn->ib_completion); 684 } 685 686 static int iser_cma_handler(struct rdma_cm_id *cma_id, 687 struct rdma_cm_event *event) 688 { 689 struct iser_conn *iser_conn; 690 int ret = 0; 691 692 iser_conn = cma_id->context; 693 iser_info("%s (%d): status %d conn %p id %p\n", 694 rdma_event_msg(event->event), event->event, 695 event->status, cma_id->context, cma_id); 696 697 mutex_lock(&iser_conn->state_mutex); 698 switch (event->event) { 699 case RDMA_CM_EVENT_ADDR_RESOLVED: 700 iser_addr_handler(cma_id); 701 break; 702 case RDMA_CM_EVENT_ROUTE_RESOLVED: 703 iser_route_handler(cma_id); 704 break; 705 case RDMA_CM_EVENT_ESTABLISHED: 706 iser_connected_handler(cma_id, event->param.conn.private_data); 707 break; 708 case RDMA_CM_EVENT_REJECTED: 709 iser_info("Connection rejected: %s\n", 710 rdma_reject_msg(cma_id, event->status)); 711 fallthrough; 712 case RDMA_CM_EVENT_ADDR_ERROR: 713 case RDMA_CM_EVENT_ROUTE_ERROR: 714 case RDMA_CM_EVENT_CONNECT_ERROR: 715 case RDMA_CM_EVENT_UNREACHABLE: 716 iser_connect_error(cma_id); 717 break; 718 case RDMA_CM_EVENT_DISCONNECTED: 719 case RDMA_CM_EVENT_ADDR_CHANGE: 720 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 721 iser_cleanup_handler(cma_id, false); 722 break; 723 case RDMA_CM_EVENT_DEVICE_REMOVAL: 724 /* 725 * we *must* destroy the device as we cannot rely 726 * on iscsid to be around to initiate error handling. 727 * also if we are not in state DOWN implicitly destroy 728 * the cma_id. 729 */ 730 iser_cleanup_handler(cma_id, true); 731 if (iser_conn->state != ISER_CONN_DOWN) { 732 iser_conn->ib_conn.cma_id = NULL; 733 ret = 1; 734 } 735 break; 736 default: 737 iser_err("Unexpected RDMA CM event: %s (%d)\n", 738 rdma_event_msg(event->event), event->event); 739 break; 740 } 741 mutex_unlock(&iser_conn->state_mutex); 742 743 return ret; 744 } 745 746 void iser_conn_init(struct iser_conn *iser_conn) 747 { 748 struct ib_conn *ib_conn = &iser_conn->ib_conn; 749 750 iser_conn->state = ISER_CONN_INIT; 751 init_completion(&iser_conn->stop_completion); 752 init_completion(&iser_conn->ib_completion); 753 init_completion(&iser_conn->up_completion); 754 INIT_LIST_HEAD(&iser_conn->conn_list); 755 mutex_init(&iser_conn->state_mutex); 756 757 ib_conn->reg_cqe.done = iser_reg_comp; 758 } 759 760 /* 761 * starts the process of connecting to the target 762 * sleeps until the connection is established or rejected 763 */ 764 int iser_connect(struct iser_conn *iser_conn, struct sockaddr *src_addr, 765 struct sockaddr *dst_addr, int non_blocking) 766 { 767 struct ib_conn *ib_conn = &iser_conn->ib_conn; 768 int err = 0; 769 770 mutex_lock(&iser_conn->state_mutex); 771 772 sprintf(iser_conn->name, "%pISp", dst_addr); 773 774 iser_info("connecting to: %s\n", iser_conn->name); 775 776 /* the device is known only --after-- address resolution */ 777 ib_conn->device = NULL; 778 779 iser_conn->state = ISER_CONN_PENDING; 780 781 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 782 iser_conn, RDMA_PS_TCP, IB_QPT_RC); 783 if (IS_ERR(ib_conn->cma_id)) { 784 err = PTR_ERR(ib_conn->cma_id); 785 iser_err("rdma_create_id failed: %d\n", err); 786 goto id_failure; 787 } 788 789 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 790 if (err) { 791 iser_err("rdma_resolve_addr failed: %d\n", err); 792 goto addr_failure; 793 } 794 795 if (!non_blocking) { 796 wait_for_completion_interruptible(&iser_conn->up_completion); 797 798 if (iser_conn->state != ISER_CONN_UP) { 799 err = -EIO; 800 goto connect_failure; 801 } 802 } 803 mutex_unlock(&iser_conn->state_mutex); 804 805 mutex_lock(&ig.connlist_mutex); 806 list_add(&iser_conn->conn_list, &ig.connlist); 807 mutex_unlock(&ig.connlist_mutex); 808 return 0; 809 810 id_failure: 811 ib_conn->cma_id = NULL; 812 addr_failure: 813 iser_conn->state = ISER_CONN_DOWN; 814 connect_failure: 815 mutex_unlock(&iser_conn->state_mutex); 816 iser_conn_release(iser_conn); 817 return err; 818 } 819 820 int iser_post_recvl(struct iser_conn *iser_conn) 821 { 822 struct ib_conn *ib_conn = &iser_conn->ib_conn; 823 struct iser_login_desc *desc = &iser_conn->login_desc; 824 struct ib_recv_wr wr; 825 int ret; 826 827 desc->sge.addr = desc->rsp_dma; 828 desc->sge.length = ISER_RX_LOGIN_SIZE; 829 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 830 831 desc->cqe.done = iser_login_rsp; 832 wr.wr_cqe = &desc->cqe; 833 wr.sg_list = &desc->sge; 834 wr.num_sge = 1; 835 wr.next = NULL; 836 837 ret = ib_post_recv(ib_conn->qp, &wr, NULL); 838 if (unlikely(ret)) 839 iser_err("ib_post_recv login failed ret=%d\n", ret); 840 841 return ret; 842 } 843 844 int iser_post_recvm(struct iser_conn *iser_conn, struct iser_rx_desc *rx_desc) 845 { 846 struct ib_conn *ib_conn = &iser_conn->ib_conn; 847 struct ib_recv_wr wr; 848 int ret; 849 850 rx_desc->cqe.done = iser_task_rsp; 851 wr.wr_cqe = &rx_desc->cqe; 852 wr.sg_list = &rx_desc->rx_sg; 853 wr.num_sge = 1; 854 wr.next = NULL; 855 856 ret = ib_post_recv(ib_conn->qp, &wr, NULL); 857 if (unlikely(ret)) 858 iser_err("ib_post_recv failed ret=%d\n", ret); 859 860 return ret; 861 } 862 863 864 /** 865 * iser_post_send - Initiate a Send DTO operation 866 * @ib_conn: connection RDMA resources 867 * @tx_desc: iSER TX descriptor 868 * 869 * Return: 0 on success, -1 on failure 870 */ 871 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc) 872 { 873 struct ib_send_wr *wr = &tx_desc->send_wr; 874 struct ib_send_wr *first_wr; 875 int ret; 876 877 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 878 tx_desc->dma_addr, ISER_HEADERS_LEN, 879 DMA_TO_DEVICE); 880 881 wr->next = NULL; 882 wr->wr_cqe = &tx_desc->cqe; 883 wr->sg_list = tx_desc->tx_sg; 884 wr->num_sge = tx_desc->num_sge; 885 wr->opcode = IB_WR_SEND; 886 wr->send_flags = IB_SEND_SIGNALED; 887 888 if (tx_desc->inv_wr.next) 889 first_wr = &tx_desc->inv_wr; 890 else if (tx_desc->reg_wr.wr.next) 891 first_wr = &tx_desc->reg_wr.wr; 892 else 893 first_wr = wr; 894 895 ret = ib_post_send(ib_conn->qp, first_wr, NULL); 896 if (unlikely(ret)) 897 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 898 ret, wr->opcode); 899 900 return ret; 901 } 902 903 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 904 enum iser_data_dir cmd_dir, sector_t *sector) 905 { 906 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 907 struct iser_fr_desc *desc = reg->desc; 908 unsigned long sector_size = iser_task->sc->device->sector_size; 909 struct ib_mr_status mr_status; 910 int ret; 911 912 if (desc && desc->sig_protected) { 913 desc->sig_protected = false; 914 ret = ib_check_mr_status(desc->rsc.sig_mr, 915 IB_MR_CHECK_SIG_STATUS, &mr_status); 916 if (ret) { 917 iser_err("ib_check_mr_status failed, ret %d\n", ret); 918 /* Not a lot we can do, return ambiguous guard error */ 919 *sector = 0; 920 return 0x1; 921 } 922 923 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 924 sector_t sector_off = mr_status.sig_err.sig_err_offset; 925 926 sector_div(sector_off, sector_size + 8); 927 *sector = scsi_get_sector(iser_task->sc) + sector_off; 928 929 iser_err("PI error found type %d at sector %llx " 930 "expected %x vs actual %x\n", 931 mr_status.sig_err.err_type, 932 (unsigned long long)*sector, 933 mr_status.sig_err.expected, 934 mr_status.sig_err.actual); 935 936 switch (mr_status.sig_err.err_type) { 937 case IB_SIG_BAD_GUARD: 938 return 0x1; 939 case IB_SIG_BAD_REFTAG: 940 return 0x3; 941 case IB_SIG_BAD_APPTAG: 942 return 0x2; 943 } 944 } 945 } 946 947 return 0; 948 } 949 950 void iser_err_comp(struct ib_wc *wc, const char *type) 951 { 952 if (wc->status != IB_WC_WR_FLUSH_ERR) { 953 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 954 955 iser_err("%s failure: %s (%d) vend_err %#x\n", type, 956 ib_wc_status_msg(wc->status), wc->status, 957 wc->vendor_err); 958 959 if (iser_conn->iscsi_conn) 960 iscsi_conn_failure(iser_conn->iscsi_conn, 961 ISCSI_ERR_CONN_FAILED); 962 } else { 963 iser_dbg("%s failure: %s (%d)\n", type, 964 ib_wc_status_msg(wc->status), wc->status); 965 } 966 } 967