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/module.h> 36 #include <linux/slab.h> 37 #include <linux/delay.h> 38 39 #include "iscsi_iser.h" 40 41 #define ISCSI_ISER_MAX_CONN 8 42 #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) 43 #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) 44 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \ 45 ISCSI_ISER_MAX_CONN) 46 47 static void iser_qp_event_callback(struct ib_event *cause, void *context) 48 { 49 iser_err("qp event %s (%d)\n", 50 ib_event_msg(cause->event), cause->event); 51 } 52 53 static void iser_event_handler(struct ib_event_handler *handler, 54 struct ib_event *event) 55 { 56 iser_err("async event %s (%d) on device %s port %d\n", 57 ib_event_msg(event->event), event->event, 58 dev_name(&event->device->dev), event->element.port_num); 59 } 60 61 /* 62 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 63 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 64 * the adaptor. 65 * 66 * Return: 0 on success, -1 on failure 67 */ 68 static int iser_create_device_ib_res(struct iser_device *device) 69 { 70 struct ib_device *ib_dev = device->ib_device; 71 72 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) { 73 iser_err("IB device does not support memory registrations\n"); 74 return -1; 75 } 76 77 device->pd = ib_alloc_pd(ib_dev, 78 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); 79 if (IS_ERR(device->pd)) 80 goto pd_err; 81 82 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev, 83 iser_event_handler); 84 ib_register_event_handler(&device->event_handler); 85 return 0; 86 87 pd_err: 88 iser_err("failed to allocate an IB resource\n"); 89 return -1; 90 } 91 92 /* 93 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 94 * CQ and PD created with the device associated with the adaptor. 95 */ 96 static void iser_free_device_ib_res(struct iser_device *device) 97 { 98 ib_unregister_event_handler(&device->event_handler); 99 ib_dealloc_pd(device->pd); 100 101 device->pd = NULL; 102 } 103 104 static struct iser_fr_desc * 105 iser_create_fastreg_desc(struct iser_device *device, 106 struct ib_pd *pd, 107 bool pi_enable, 108 unsigned int size) 109 { 110 struct iser_fr_desc *desc; 111 struct ib_device *ib_dev = device->ib_device; 112 enum ib_mr_type mr_type; 113 int ret; 114 115 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 116 if (!desc) 117 return ERR_PTR(-ENOMEM); 118 119 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) 120 mr_type = IB_MR_TYPE_SG_GAPS; 121 else 122 mr_type = IB_MR_TYPE_MEM_REG; 123 124 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size); 125 if (IS_ERR(desc->rsc.mr)) { 126 ret = PTR_ERR(desc->rsc.mr); 127 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 128 goto err_alloc_mr; 129 } 130 131 if (pi_enable) { 132 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size); 133 if (IS_ERR(desc->rsc.sig_mr)) { 134 ret = PTR_ERR(desc->rsc.sig_mr); 135 iser_err("Failed to allocate sig_mr err=%d\n", ret); 136 goto err_alloc_mr_integrity; 137 } 138 } 139 desc->rsc.mr_valid = 0; 140 141 return desc; 142 143 err_alloc_mr_integrity: 144 ib_dereg_mr(desc->rsc.mr); 145 err_alloc_mr: 146 kfree(desc); 147 148 return ERR_PTR(ret); 149 } 150 151 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc) 152 { 153 struct iser_reg_resources *res = &desc->rsc; 154 155 ib_dereg_mr(res->mr); 156 if (res->sig_mr) { 157 ib_dereg_mr(res->sig_mr); 158 res->sig_mr = NULL; 159 } 160 kfree(desc); 161 } 162 163 /** 164 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 165 * for fast registration work requests. 166 * @ib_conn: connection RDMA resources 167 * @cmds_max: max number of SCSI commands for this connection 168 * @size: max number of pages per map request 169 * 170 * Return: 0 on success, or errno code on failure 171 */ 172 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 173 unsigned cmds_max, 174 unsigned int size) 175 { 176 struct iser_device *device = ib_conn->device; 177 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 178 struct iser_fr_desc *desc; 179 int i, ret; 180 181 INIT_LIST_HEAD(&fr_pool->list); 182 INIT_LIST_HEAD(&fr_pool->all_list); 183 spin_lock_init(&fr_pool->lock); 184 fr_pool->size = 0; 185 for (i = 0; i < cmds_max; i++) { 186 desc = iser_create_fastreg_desc(device, device->pd, 187 ib_conn->pi_support, size); 188 if (IS_ERR(desc)) { 189 ret = PTR_ERR(desc); 190 goto err; 191 } 192 193 list_add_tail(&desc->list, &fr_pool->list); 194 list_add_tail(&desc->all_list, &fr_pool->all_list); 195 fr_pool->size++; 196 } 197 198 return 0; 199 200 err: 201 iser_free_fastreg_pool(ib_conn); 202 return ret; 203 } 204 205 /** 206 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 207 * @ib_conn: connection RDMA resources 208 */ 209 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 210 { 211 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 212 struct iser_fr_desc *desc, *tmp; 213 int i = 0; 214 215 if (list_empty(&fr_pool->all_list)) 216 return; 217 218 iser_info("freeing conn %p fr pool\n", ib_conn); 219 220 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 221 list_del(&desc->all_list); 222 iser_destroy_fastreg_desc(desc); 223 ++i; 224 } 225 226 if (i < fr_pool->size) 227 iser_warn("pool still has %d regions registered\n", 228 fr_pool->size - i); 229 } 230 231 /* 232 * iser_create_ib_conn_res - Queue-Pair (QP) 233 * 234 * Return: 0 on success, -1 on failure 235 */ 236 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 237 { 238 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 239 struct iser_device *device; 240 struct ib_device *ib_dev; 241 struct ib_qp_init_attr init_attr; 242 int ret = -ENOMEM; 243 unsigned int max_send_wr, cq_size; 244 245 BUG_ON(ib_conn->device == NULL); 246 247 device = ib_conn->device; 248 ib_dev = device->ib_device; 249 250 if (ib_conn->pi_support) 251 max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 252 else 253 max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 254 max_send_wr = min_t(unsigned int, max_send_wr, 255 (unsigned int)ib_dev->attrs.max_qp_wr); 256 257 cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS; 258 ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ); 259 if (IS_ERR(ib_conn->cq)) { 260 ret = PTR_ERR(ib_conn->cq); 261 goto cq_err; 262 } 263 ib_conn->cq_size = cq_size; 264 265 memset(&init_attr, 0, sizeof(init_attr)); 266 267 init_attr.event_handler = iser_qp_event_callback; 268 init_attr.qp_context = (void *)ib_conn; 269 init_attr.send_cq = ib_conn->cq; 270 init_attr.recv_cq = ib_conn->cq; 271 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 272 init_attr.cap.max_send_sge = 2; 273 init_attr.cap.max_recv_sge = 1; 274 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 275 init_attr.qp_type = IB_QPT_RC; 276 init_attr.cap.max_send_wr = max_send_wr; 277 if (ib_conn->pi_support) 278 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; 279 iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1); 280 281 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 282 if (ret) 283 goto out_err; 284 285 ib_conn->qp = ib_conn->cma_id->qp; 286 iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", 287 ib_conn, ib_conn->cma_id, 288 ib_conn->cma_id->qp, max_send_wr); 289 return ret; 290 291 out_err: 292 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 293 cq_err: 294 iser_err("unable to alloc mem or create resource, err %d\n", ret); 295 296 return ret; 297 } 298 299 /* 300 * based on the resolved device node GUID see if there already allocated 301 * device for this device. If there's no such, create one. 302 */ 303 static 304 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 305 { 306 struct iser_device *device; 307 308 mutex_lock(&ig.device_list_mutex); 309 310 list_for_each_entry(device, &ig.device_list, ig_list) 311 /* find if there's a match using the node GUID */ 312 if (device->ib_device->node_guid == cma_id->device->node_guid) 313 goto inc_refcnt; 314 315 device = kzalloc(sizeof *device, GFP_KERNEL); 316 if (device == NULL) 317 goto out; 318 319 /* assign this device to the device */ 320 device->ib_device = cma_id->device; 321 /* init the device and link it into ig device list */ 322 if (iser_create_device_ib_res(device)) { 323 kfree(device); 324 device = NULL; 325 goto out; 326 } 327 list_add(&device->ig_list, &ig.device_list); 328 329 inc_refcnt: 330 device->refcount++; 331 out: 332 mutex_unlock(&ig.device_list_mutex); 333 return device; 334 } 335 336 /* if there's no demand for this device, release it */ 337 static void iser_device_try_release(struct iser_device *device) 338 { 339 mutex_lock(&ig.device_list_mutex); 340 device->refcount--; 341 iser_info("device %p refcount %d\n", device, device->refcount); 342 if (!device->refcount) { 343 iser_free_device_ib_res(device); 344 list_del(&device->ig_list); 345 kfree(device); 346 } 347 mutex_unlock(&ig.device_list_mutex); 348 } 349 350 /* 351 * Called with state mutex held 352 */ 353 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, 354 enum iser_conn_state comp, 355 enum iser_conn_state exch) 356 { 357 int ret; 358 359 ret = (iser_conn->state == comp); 360 if (ret) 361 iser_conn->state = exch; 362 363 return ret; 364 } 365 366 void iser_release_work(struct work_struct *work) 367 { 368 struct iser_conn *iser_conn; 369 370 iser_conn = container_of(work, struct iser_conn, release_work); 371 372 /* Wait for conn_stop to complete */ 373 wait_for_completion(&iser_conn->stop_completion); 374 /* Wait for IB resouces cleanup to complete */ 375 wait_for_completion(&iser_conn->ib_completion); 376 377 mutex_lock(&iser_conn->state_mutex); 378 iser_conn->state = ISER_CONN_DOWN; 379 mutex_unlock(&iser_conn->state_mutex); 380 381 iser_conn_release(iser_conn); 382 } 383 384 /** 385 * iser_free_ib_conn_res - release IB related resources 386 * @iser_conn: iser connection struct 387 * @destroy: indicator if we need to try to release the 388 * iser device and memory regoins pool (only iscsi 389 * shutdown and DEVICE_REMOVAL will use this). 390 * 391 * This routine is called with the iser state mutex held 392 * so the cm_id removal is out of here. It is Safe to 393 * be invoked multiple times. 394 */ 395 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, 396 bool destroy) 397 { 398 struct ib_conn *ib_conn = &iser_conn->ib_conn; 399 struct iser_device *device = ib_conn->device; 400 401 iser_info("freeing conn %p cma_id %p qp %p\n", 402 iser_conn, ib_conn->cma_id, ib_conn->qp); 403 404 if (ib_conn->qp != NULL) { 405 rdma_destroy_qp(ib_conn->cma_id); 406 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size); 407 ib_conn->qp = NULL; 408 } 409 410 if (destroy) { 411 if (iser_conn->rx_descs) 412 iser_free_rx_descriptors(iser_conn); 413 414 if (device != NULL) { 415 iser_device_try_release(device); 416 ib_conn->device = NULL; 417 } 418 } 419 } 420 421 /** 422 * iser_conn_release - Frees all conn objects and deallocs conn descriptor 423 * @iser_conn: iSER connection context 424 */ 425 void iser_conn_release(struct iser_conn *iser_conn) 426 { 427 struct ib_conn *ib_conn = &iser_conn->ib_conn; 428 429 mutex_lock(&ig.connlist_mutex); 430 list_del(&iser_conn->conn_list); 431 mutex_unlock(&ig.connlist_mutex); 432 433 mutex_lock(&iser_conn->state_mutex); 434 /* In case we endup here without ep_disconnect being invoked. */ 435 if (iser_conn->state != ISER_CONN_DOWN) { 436 iser_warn("iser conn %p state %d, expected state down.\n", 437 iser_conn, iser_conn->state); 438 iscsi_destroy_endpoint(iser_conn->ep); 439 iser_conn->state = ISER_CONN_DOWN; 440 } 441 /* 442 * In case we never got to bind stage, we still need to 443 * release IB resources (which is safe to call more than once). 444 */ 445 iser_free_ib_conn_res(iser_conn, true); 446 mutex_unlock(&iser_conn->state_mutex); 447 448 if (ib_conn->cma_id != NULL) { 449 rdma_destroy_id(ib_conn->cma_id); 450 ib_conn->cma_id = NULL; 451 } 452 453 kfree(iser_conn); 454 } 455 456 /** 457 * iser_conn_terminate - triggers start of the disconnect procedures and 458 * waits for them to be done 459 * @iser_conn: iSER connection context 460 * 461 * Called with state mutex held 462 */ 463 int iser_conn_terminate(struct iser_conn *iser_conn) 464 { 465 struct ib_conn *ib_conn = &iser_conn->ib_conn; 466 int err = 0; 467 468 /* terminate the iser conn only if the conn state is UP */ 469 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, 470 ISER_CONN_TERMINATING)) 471 return 0; 472 473 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 474 475 /* suspend queuing of new iscsi commands */ 476 if (iser_conn->iscsi_conn) 477 iscsi_suspend_queue(iser_conn->iscsi_conn); 478 479 /* 480 * In case we didn't already clean up the cma_id (peer initiated 481 * a disconnection), we need to Cause the CMA to change the QP 482 * state to ERROR. 483 */ 484 if (ib_conn->cma_id) { 485 err = rdma_disconnect(ib_conn->cma_id); 486 if (err) 487 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 488 iser_conn, err); 489 490 /* block until all flush errors are consumed */ 491 ib_drain_sq(ib_conn->qp); 492 } 493 494 return 1; 495 } 496 497 /* 498 * Called with state mutex held 499 */ 500 static void iser_connect_error(struct rdma_cm_id *cma_id) 501 { 502 struct iser_conn *iser_conn; 503 504 iser_conn = (struct iser_conn *)cma_id->context; 505 iser_conn->state = ISER_CONN_TERMINATING; 506 } 507 508 static void 509 iser_calc_scsi_params(struct iser_conn *iser_conn, 510 unsigned int max_sectors) 511 { 512 struct iser_device *device = iser_conn->ib_conn.device; 513 struct ib_device_attr *attr = &device->ib_device->attrs; 514 unsigned short sg_tablesize, sup_sg_tablesize; 515 unsigned short reserved_mr_pages; 516 u32 max_num_sg; 517 518 /* 519 * FRs without SG_GAPS can only map up to a (device) page per entry, 520 * but if the first entry is misaligned we'll end up using two entries 521 * (head and tail) for a single page worth data, so one additional 522 * entry is required. 523 */ 524 if (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG) 525 reserved_mr_pages = 0; 526 else 527 reserved_mr_pages = 1; 528 529 if (iser_conn->ib_conn.pi_support) 530 max_num_sg = attr->max_pi_fast_reg_page_list_len; 531 else 532 max_num_sg = attr->max_fast_reg_page_list_len; 533 534 sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K); 535 sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE, 536 max_num_sg - reserved_mr_pages); 537 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 538 iser_conn->pages_per_mr = 539 iser_conn->scsi_sg_tablesize + reserved_mr_pages; 540 } 541 542 /* 543 * Called with state mutex held 544 */ 545 static void iser_addr_handler(struct rdma_cm_id *cma_id) 546 { 547 struct iser_device *device; 548 struct iser_conn *iser_conn; 549 struct ib_conn *ib_conn; 550 int ret; 551 552 iser_conn = (struct iser_conn *)cma_id->context; 553 if (iser_conn->state != ISER_CONN_PENDING) 554 /* bailout */ 555 return; 556 557 ib_conn = &iser_conn->ib_conn; 558 device = iser_device_find_by_ib_device(cma_id); 559 if (!device) { 560 iser_err("device lookup/creation failed\n"); 561 iser_connect_error(cma_id); 562 return; 563 } 564 565 ib_conn->device = device; 566 567 /* connection T10-PI support */ 568 if (iser_pi_enable) { 569 if (!(device->ib_device->attrs.device_cap_flags & 570 IB_DEVICE_INTEGRITY_HANDOVER)) { 571 iser_warn("T10-PI requested but not supported on %s, " 572 "continue without T10-PI\n", 573 dev_name(&ib_conn->device->ib_device->dev)); 574 ib_conn->pi_support = false; 575 } else { 576 ib_conn->pi_support = true; 577 } 578 } 579 580 iser_calc_scsi_params(iser_conn, iser_max_sectors); 581 582 ret = rdma_resolve_route(cma_id, 1000); 583 if (ret) { 584 iser_err("resolve route failed: %d\n", ret); 585 iser_connect_error(cma_id); 586 return; 587 } 588 } 589 590 /* 591 * Called with state mutex held 592 */ 593 static void iser_route_handler(struct rdma_cm_id *cma_id) 594 { 595 struct rdma_conn_param conn_param; 596 int ret; 597 struct iser_cm_hdr req_hdr; 598 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 599 struct ib_conn *ib_conn = &iser_conn->ib_conn; 600 struct ib_device *ib_dev = ib_conn->device->ib_device; 601 602 if (iser_conn->state != ISER_CONN_PENDING) 603 /* bailout */ 604 return; 605 606 ret = iser_create_ib_conn_res(ib_conn); 607 if (ret) 608 goto failure; 609 610 memset(&conn_param, 0, sizeof conn_param); 611 conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom; 612 conn_param.initiator_depth = 1; 613 conn_param.retry_count = 7; 614 conn_param.rnr_retry_count = 6; 615 616 memset(&req_hdr, 0, sizeof(req_hdr)); 617 req_hdr.flags = ISER_ZBVA_NOT_SUP; 618 if (!iser_always_reg) 619 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 620 conn_param.private_data = (void *)&req_hdr; 621 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 622 623 ret = rdma_connect(cma_id, &conn_param); 624 if (ret) { 625 iser_err("failure connecting: %d\n", ret); 626 goto failure; 627 } 628 629 return; 630 failure: 631 iser_connect_error(cma_id); 632 } 633 634 static void iser_connected_handler(struct rdma_cm_id *cma_id, 635 const void *private_data) 636 { 637 struct iser_conn *iser_conn; 638 struct ib_qp_attr attr; 639 struct ib_qp_init_attr init_attr; 640 641 iser_conn = (struct iser_conn *)cma_id->context; 642 if (iser_conn->state != ISER_CONN_PENDING) 643 /* bailout */ 644 return; 645 646 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 647 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 648 649 if (private_data) { 650 u8 flags = *(u8 *)private_data; 651 652 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 653 } 654 655 iser_info("conn %p: negotiated %s invalidation\n", 656 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 657 658 iser_conn->state = ISER_CONN_UP; 659 complete(&iser_conn->up_completion); 660 } 661 662 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 663 { 664 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 665 666 if (iser_conn_terminate(iser_conn)) { 667 if (iser_conn->iscsi_conn) 668 iscsi_conn_failure(iser_conn->iscsi_conn, 669 ISCSI_ERR_CONN_FAILED); 670 else 671 iser_err("iscsi_iser connection isn't bound\n"); 672 } 673 } 674 675 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 676 bool destroy) 677 { 678 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 679 680 /* 681 * We are not guaranteed that we visited disconnected_handler 682 * by now, call it here to be safe that we handle CM drep 683 * and flush errors. 684 */ 685 iser_disconnected_handler(cma_id); 686 iser_free_ib_conn_res(iser_conn, destroy); 687 complete(&iser_conn->ib_completion); 688 }; 689 690 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 691 { 692 struct iser_conn *iser_conn; 693 int ret = 0; 694 695 iser_conn = (struct iser_conn *)cma_id->context; 696 iser_info("%s (%d): status %d conn %p id %p\n", 697 rdma_event_msg(event->event), event->event, 698 event->status, cma_id->context, cma_id); 699 700 mutex_lock(&iser_conn->state_mutex); 701 switch (event->event) { 702 case RDMA_CM_EVENT_ADDR_RESOLVED: 703 iser_addr_handler(cma_id); 704 break; 705 case RDMA_CM_EVENT_ROUTE_RESOLVED: 706 iser_route_handler(cma_id); 707 break; 708 case RDMA_CM_EVENT_ESTABLISHED: 709 iser_connected_handler(cma_id, event->param.conn.private_data); 710 break; 711 case RDMA_CM_EVENT_REJECTED: 712 iser_info("Connection rejected: %s\n", 713 rdma_reject_msg(cma_id, event->status)); 714 /* FALLTHROUGH */ 715 case RDMA_CM_EVENT_ADDR_ERROR: 716 case RDMA_CM_EVENT_ROUTE_ERROR: 717 case RDMA_CM_EVENT_CONNECT_ERROR: 718 case RDMA_CM_EVENT_UNREACHABLE: 719 iser_connect_error(cma_id); 720 break; 721 case RDMA_CM_EVENT_DISCONNECTED: 722 case RDMA_CM_EVENT_ADDR_CHANGE: 723 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 724 iser_cleanup_handler(cma_id, false); 725 break; 726 case RDMA_CM_EVENT_DEVICE_REMOVAL: 727 /* 728 * we *must* destroy the device as we cannot rely 729 * on iscsid to be around to initiate error handling. 730 * also if we are not in state DOWN implicitly destroy 731 * the cma_id. 732 */ 733 iser_cleanup_handler(cma_id, true); 734 if (iser_conn->state != ISER_CONN_DOWN) { 735 iser_conn->ib_conn.cma_id = NULL; 736 ret = 1; 737 } 738 break; 739 default: 740 iser_err("Unexpected RDMA CM event: %s (%d)\n", 741 rdma_event_msg(event->event), event->event); 742 break; 743 } 744 mutex_unlock(&iser_conn->state_mutex); 745 746 return ret; 747 } 748 749 void iser_conn_init(struct iser_conn *iser_conn) 750 { 751 struct ib_conn *ib_conn = &iser_conn->ib_conn; 752 753 iser_conn->state = ISER_CONN_INIT; 754 init_completion(&iser_conn->stop_completion); 755 init_completion(&iser_conn->ib_completion); 756 init_completion(&iser_conn->up_completion); 757 INIT_LIST_HEAD(&iser_conn->conn_list); 758 mutex_init(&iser_conn->state_mutex); 759 760 ib_conn->post_recv_buf_count = 0; 761 ib_conn->reg_cqe.done = iser_reg_comp; 762 } 763 764 /** 765 * starts the process of connecting to the target 766 * sleeps until the connection is established or rejected 767 */ 768 int iser_connect(struct iser_conn *iser_conn, 769 struct sockaddr *src_addr, 770 struct sockaddr *dst_addr, 771 int non_blocking) 772 { 773 struct ib_conn *ib_conn = &iser_conn->ib_conn; 774 int err = 0; 775 776 mutex_lock(&iser_conn->state_mutex); 777 778 sprintf(iser_conn->name, "%pISp", dst_addr); 779 780 iser_info("connecting to: %s\n", iser_conn->name); 781 782 /* the device is known only --after-- address resolution */ 783 ib_conn->device = NULL; 784 785 iser_conn->state = ISER_CONN_PENDING; 786 787 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 788 (void *)iser_conn, 789 RDMA_PS_TCP, IB_QPT_RC); 790 if (IS_ERR(ib_conn->cma_id)) { 791 err = PTR_ERR(ib_conn->cma_id); 792 iser_err("rdma_create_id failed: %d\n", err); 793 goto id_failure; 794 } 795 796 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 797 if (err) { 798 iser_err("rdma_resolve_addr failed: %d\n", err); 799 goto addr_failure; 800 } 801 802 if (!non_blocking) { 803 wait_for_completion_interruptible(&iser_conn->up_completion); 804 805 if (iser_conn->state != ISER_CONN_UP) { 806 err = -EIO; 807 goto connect_failure; 808 } 809 } 810 mutex_unlock(&iser_conn->state_mutex); 811 812 mutex_lock(&ig.connlist_mutex); 813 list_add(&iser_conn->conn_list, &ig.connlist); 814 mutex_unlock(&ig.connlist_mutex); 815 return 0; 816 817 id_failure: 818 ib_conn->cma_id = NULL; 819 addr_failure: 820 iser_conn->state = ISER_CONN_DOWN; 821 connect_failure: 822 mutex_unlock(&iser_conn->state_mutex); 823 iser_conn_release(iser_conn); 824 return err; 825 } 826 827 int iser_post_recvl(struct iser_conn *iser_conn) 828 { 829 struct ib_conn *ib_conn = &iser_conn->ib_conn; 830 struct iser_login_desc *desc = &iser_conn->login_desc; 831 struct ib_recv_wr wr; 832 int ib_ret; 833 834 desc->sge.addr = desc->rsp_dma; 835 desc->sge.length = ISER_RX_LOGIN_SIZE; 836 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 837 838 desc->cqe.done = iser_login_rsp; 839 wr.wr_cqe = &desc->cqe; 840 wr.sg_list = &desc->sge; 841 wr.num_sge = 1; 842 wr.next = NULL; 843 844 ib_conn->post_recv_buf_count++; 845 ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL); 846 if (ib_ret) { 847 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 848 ib_conn->post_recv_buf_count--; 849 } 850 851 return ib_ret; 852 } 853 854 int iser_post_recvm(struct iser_conn *iser_conn, int count) 855 { 856 struct ib_conn *ib_conn = &iser_conn->ib_conn; 857 unsigned int my_rx_head = iser_conn->rx_desc_head; 858 struct iser_rx_desc *rx_desc; 859 struct ib_recv_wr *wr; 860 int i, ib_ret; 861 862 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) { 863 rx_desc = &iser_conn->rx_descs[my_rx_head]; 864 rx_desc->cqe.done = iser_task_rsp; 865 wr->wr_cqe = &rx_desc->cqe; 866 wr->sg_list = &rx_desc->rx_sg; 867 wr->num_sge = 1; 868 wr->next = wr + 1; 869 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; 870 } 871 872 wr--; 873 wr->next = NULL; /* mark end of work requests list */ 874 875 ib_conn->post_recv_buf_count += count; 876 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, NULL); 877 if (unlikely(ib_ret)) { 878 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 879 ib_conn->post_recv_buf_count -= count; 880 } else 881 iser_conn->rx_desc_head = my_rx_head; 882 883 return ib_ret; 884 } 885 886 887 /** 888 * iser_post_send - Initiate a Send DTO operation 889 * @ib_conn: connection RDMA resources 890 * @tx_desc: iSER TX descriptor 891 * @signal: true to send work request as SIGNALED 892 * 893 * Return: 0 on success, -1 on failure 894 */ 895 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 896 bool signal) 897 { 898 struct ib_send_wr *wr = &tx_desc->send_wr; 899 struct ib_send_wr *first_wr; 900 int ib_ret; 901 902 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 903 tx_desc->dma_addr, ISER_HEADERS_LEN, 904 DMA_TO_DEVICE); 905 906 wr->next = NULL; 907 wr->wr_cqe = &tx_desc->cqe; 908 wr->sg_list = tx_desc->tx_sg; 909 wr->num_sge = tx_desc->num_sge; 910 wr->opcode = IB_WR_SEND; 911 wr->send_flags = signal ? IB_SEND_SIGNALED : 0; 912 913 if (tx_desc->inv_wr.next) 914 first_wr = &tx_desc->inv_wr; 915 else if (tx_desc->reg_wr.wr.next) 916 first_wr = &tx_desc->reg_wr.wr; 917 else 918 first_wr = wr; 919 920 ib_ret = ib_post_send(ib_conn->qp, first_wr, NULL); 921 if (unlikely(ib_ret)) 922 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 923 ib_ret, wr->opcode); 924 925 return ib_ret; 926 } 927 928 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 929 enum iser_data_dir cmd_dir, sector_t *sector) 930 { 931 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 932 struct iser_fr_desc *desc = reg->mem_h; 933 unsigned long sector_size = iser_task->sc->device->sector_size; 934 struct ib_mr_status mr_status; 935 int ret; 936 937 if (desc && desc->sig_protected) { 938 desc->sig_protected = false; 939 ret = ib_check_mr_status(desc->rsc.sig_mr, 940 IB_MR_CHECK_SIG_STATUS, &mr_status); 941 if (ret) { 942 iser_err("ib_check_mr_status failed, ret %d\n", ret); 943 /* Not a lot we can do, return ambiguous guard error */ 944 *sector = 0; 945 return 0x1; 946 } 947 948 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 949 sector_t sector_off = mr_status.sig_err.sig_err_offset; 950 951 sector_div(sector_off, sector_size + 8); 952 *sector = scsi_get_lba(iser_task->sc) + sector_off; 953 954 iser_err("PI error found type %d at sector %llx " 955 "expected %x vs actual %x\n", 956 mr_status.sig_err.err_type, 957 (unsigned long long)*sector, 958 mr_status.sig_err.expected, 959 mr_status.sig_err.actual); 960 961 switch (mr_status.sig_err.err_type) { 962 case IB_SIG_BAD_GUARD: 963 return 0x1; 964 case IB_SIG_BAD_REFTAG: 965 return 0x3; 966 case IB_SIG_BAD_APPTAG: 967 return 0x2; 968 } 969 } 970 } 971 972 return 0; 973 } 974 975 void iser_err_comp(struct ib_wc *wc, const char *type) 976 { 977 if (wc->status != IB_WC_WR_FLUSH_ERR) { 978 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 979 980 iser_err("%s failure: %s (%d) vend_err %#x\n", type, 981 ib_wc_status_msg(wc->status), wc->status, 982 wc->vendor_err); 983 984 if (iser_conn->iscsi_conn) 985 iscsi_conn_failure(iser_conn->iscsi_conn, 986 ISCSI_ERR_CONN_FAILED); 987 } else { 988 iser_dbg("%s failure: %s (%d)\n", type, 989 ib_wc_status_msg(wc->status), wc->status); 990 } 991 } 992