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 event->device->name, 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 adapator. 65 * 66 * returns 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 int ret, i, max_cqe; 72 73 ret = iser_assign_reg_ops(device); 74 if (ret) 75 return ret; 76 77 device->comps_used = min_t(int, num_online_cpus(), 78 ib_dev->num_comp_vectors); 79 80 device->comps = kcalloc(device->comps_used, sizeof(*device->comps), 81 GFP_KERNEL); 82 if (!device->comps) 83 goto comps_err; 84 85 max_cqe = min(ISER_MAX_CQ_LEN, ib_dev->attrs.max_cqe); 86 87 iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n", 88 device->comps_used, ib_dev->name, 89 ib_dev->num_comp_vectors, max_cqe); 90 91 device->pd = ib_alloc_pd(ib_dev, 92 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY); 93 if (IS_ERR(device->pd)) 94 goto pd_err; 95 96 for (i = 0; i < device->comps_used; i++) { 97 struct iser_comp *comp = &device->comps[i]; 98 99 comp->cq = ib_alloc_cq(ib_dev, comp, max_cqe, i, 100 IB_POLL_SOFTIRQ); 101 if (IS_ERR(comp->cq)) { 102 comp->cq = NULL; 103 goto cq_err; 104 } 105 } 106 107 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev, 108 iser_event_handler); 109 if (ib_register_event_handler(&device->event_handler)) 110 goto cq_err; 111 112 return 0; 113 114 cq_err: 115 for (i = 0; i < device->comps_used; i++) { 116 struct iser_comp *comp = &device->comps[i]; 117 118 if (comp->cq) 119 ib_free_cq(comp->cq); 120 } 121 ib_dealloc_pd(device->pd); 122 pd_err: 123 kfree(device->comps); 124 comps_err: 125 iser_err("failed to allocate an IB resource\n"); 126 return -1; 127 } 128 129 /** 130 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 131 * CQ and PD created with the device associated with the adapator. 132 */ 133 static void iser_free_device_ib_res(struct iser_device *device) 134 { 135 int i; 136 137 for (i = 0; i < device->comps_used; i++) { 138 struct iser_comp *comp = &device->comps[i]; 139 140 ib_free_cq(comp->cq); 141 comp->cq = NULL; 142 } 143 144 (void)ib_unregister_event_handler(&device->event_handler); 145 ib_dealloc_pd(device->pd); 146 147 kfree(device->comps); 148 device->comps = NULL; 149 device->pd = NULL; 150 } 151 152 /** 153 * iser_alloc_fmr_pool - Creates FMR pool and page_vector 154 * 155 * returns 0 on success, or errno code on failure 156 */ 157 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, 158 unsigned cmds_max, 159 unsigned int size) 160 { 161 struct iser_device *device = ib_conn->device; 162 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 163 struct iser_page_vec *page_vec; 164 struct iser_fr_desc *desc; 165 struct ib_fmr_pool *fmr_pool; 166 struct ib_fmr_pool_param params; 167 int ret; 168 169 INIT_LIST_HEAD(&fr_pool->list); 170 spin_lock_init(&fr_pool->lock); 171 172 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 173 if (!desc) 174 return -ENOMEM; 175 176 page_vec = kmalloc(sizeof(*page_vec) + (sizeof(u64) * size), 177 GFP_KERNEL); 178 if (!page_vec) { 179 ret = -ENOMEM; 180 goto err_frpl; 181 } 182 183 page_vec->pages = (u64 *)(page_vec + 1); 184 185 params.page_shift = SHIFT_4K; 186 params.max_pages_per_fmr = size; 187 /* make the pool size twice the max number of SCSI commands * 188 * the ML is expected to queue, watermark for unmap at 50% */ 189 params.pool_size = cmds_max * 2; 190 params.dirty_watermark = cmds_max; 191 params.cache = 0; 192 params.flush_function = NULL; 193 params.access = (IB_ACCESS_LOCAL_WRITE | 194 IB_ACCESS_REMOTE_WRITE | 195 IB_ACCESS_REMOTE_READ); 196 197 fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 198 if (IS_ERR(fmr_pool)) { 199 ret = PTR_ERR(fmr_pool); 200 iser_err("FMR allocation failed, err %d\n", ret); 201 goto err_fmr; 202 } 203 204 desc->rsc.page_vec = page_vec; 205 desc->rsc.fmr_pool = fmr_pool; 206 list_add(&desc->list, &fr_pool->list); 207 208 return 0; 209 210 err_fmr: 211 kfree(page_vec); 212 err_frpl: 213 kfree(desc); 214 215 return ret; 216 } 217 218 /** 219 * iser_free_fmr_pool - releases the FMR pool and page vec 220 */ 221 void iser_free_fmr_pool(struct ib_conn *ib_conn) 222 { 223 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 224 struct iser_fr_desc *desc; 225 226 desc = list_first_entry(&fr_pool->list, 227 struct iser_fr_desc, list); 228 list_del(&desc->list); 229 230 iser_info("freeing conn %p fmr pool %p\n", 231 ib_conn, desc->rsc.fmr_pool); 232 233 ib_destroy_fmr_pool(desc->rsc.fmr_pool); 234 kfree(desc->rsc.page_vec); 235 kfree(desc); 236 } 237 238 static int 239 iser_alloc_reg_res(struct iser_device *device, 240 struct ib_pd *pd, 241 struct iser_reg_resources *res, 242 unsigned int size) 243 { 244 struct ib_device *ib_dev = device->ib_device; 245 enum ib_mr_type mr_type; 246 int ret; 247 248 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) 249 mr_type = IB_MR_TYPE_SG_GAPS; 250 else 251 mr_type = IB_MR_TYPE_MEM_REG; 252 253 res->mr = ib_alloc_mr(pd, mr_type, size); 254 if (IS_ERR(res->mr)) { 255 ret = PTR_ERR(res->mr); 256 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 257 return ret; 258 } 259 res->mr_valid = 0; 260 261 return 0; 262 } 263 264 static void 265 iser_free_reg_res(struct iser_reg_resources *rsc) 266 { 267 ib_dereg_mr(rsc->mr); 268 } 269 270 static int 271 iser_alloc_pi_ctx(struct iser_device *device, 272 struct ib_pd *pd, 273 struct iser_fr_desc *desc, 274 unsigned int size) 275 { 276 struct iser_pi_context *pi_ctx = NULL; 277 int ret; 278 279 desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); 280 if (!desc->pi_ctx) 281 return -ENOMEM; 282 283 pi_ctx = desc->pi_ctx; 284 285 ret = iser_alloc_reg_res(device, pd, &pi_ctx->rsc, size); 286 if (ret) { 287 iser_err("failed to allocate reg_resources\n"); 288 goto alloc_reg_res_err; 289 } 290 291 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2); 292 if (IS_ERR(pi_ctx->sig_mr)) { 293 ret = PTR_ERR(pi_ctx->sig_mr); 294 goto sig_mr_failure; 295 } 296 pi_ctx->sig_mr_valid = 0; 297 desc->pi_ctx->sig_protected = 0; 298 299 return 0; 300 301 sig_mr_failure: 302 iser_free_reg_res(&pi_ctx->rsc); 303 alloc_reg_res_err: 304 kfree(desc->pi_ctx); 305 306 return ret; 307 } 308 309 static void 310 iser_free_pi_ctx(struct iser_pi_context *pi_ctx) 311 { 312 iser_free_reg_res(&pi_ctx->rsc); 313 ib_dereg_mr(pi_ctx->sig_mr); 314 kfree(pi_ctx); 315 } 316 317 static struct iser_fr_desc * 318 iser_create_fastreg_desc(struct iser_device *device, 319 struct ib_pd *pd, 320 bool pi_enable, 321 unsigned int size) 322 { 323 struct iser_fr_desc *desc; 324 int ret; 325 326 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 327 if (!desc) 328 return ERR_PTR(-ENOMEM); 329 330 ret = iser_alloc_reg_res(device, pd, &desc->rsc, size); 331 if (ret) 332 goto reg_res_alloc_failure; 333 334 if (pi_enable) { 335 ret = iser_alloc_pi_ctx(device, pd, desc, size); 336 if (ret) 337 goto pi_ctx_alloc_failure; 338 } 339 340 return desc; 341 342 pi_ctx_alloc_failure: 343 iser_free_reg_res(&desc->rsc); 344 reg_res_alloc_failure: 345 kfree(desc); 346 347 return ERR_PTR(ret); 348 } 349 350 /** 351 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 352 * for fast registration work requests. 353 * returns 0 on success, or errno code on failure 354 */ 355 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 356 unsigned cmds_max, 357 unsigned int size) 358 { 359 struct iser_device *device = ib_conn->device; 360 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 361 struct iser_fr_desc *desc; 362 int i, ret; 363 364 INIT_LIST_HEAD(&fr_pool->list); 365 INIT_LIST_HEAD(&fr_pool->all_list); 366 spin_lock_init(&fr_pool->lock); 367 fr_pool->size = 0; 368 for (i = 0; i < cmds_max; i++) { 369 desc = iser_create_fastreg_desc(device, device->pd, 370 ib_conn->pi_support, size); 371 if (IS_ERR(desc)) { 372 ret = PTR_ERR(desc); 373 goto err; 374 } 375 376 list_add_tail(&desc->list, &fr_pool->list); 377 list_add_tail(&desc->all_list, &fr_pool->all_list); 378 fr_pool->size++; 379 } 380 381 return 0; 382 383 err: 384 iser_free_fastreg_pool(ib_conn); 385 return ret; 386 } 387 388 /** 389 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 390 */ 391 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 392 { 393 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 394 struct iser_fr_desc *desc, *tmp; 395 int i = 0; 396 397 if (list_empty(&fr_pool->all_list)) 398 return; 399 400 iser_info("freeing conn %p fr pool\n", ib_conn); 401 402 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 403 list_del(&desc->all_list); 404 iser_free_reg_res(&desc->rsc); 405 if (desc->pi_ctx) 406 iser_free_pi_ctx(desc->pi_ctx); 407 kfree(desc); 408 ++i; 409 } 410 411 if (i < fr_pool->size) 412 iser_warn("pool still has %d regions registered\n", 413 fr_pool->size - i); 414 } 415 416 /** 417 * iser_create_ib_conn_res - Queue-Pair (QP) 418 * 419 * returns 0 on success, -1 on failure 420 */ 421 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 422 { 423 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 424 struct iser_device *device; 425 struct ib_device *ib_dev; 426 struct ib_qp_init_attr init_attr; 427 int ret = -ENOMEM; 428 int index, min_index = 0; 429 430 BUG_ON(ib_conn->device == NULL); 431 432 device = ib_conn->device; 433 ib_dev = device->ib_device; 434 435 memset(&init_attr, 0, sizeof init_attr); 436 437 mutex_lock(&ig.connlist_mutex); 438 /* select the CQ with the minimal number of usages */ 439 for (index = 0; index < device->comps_used; index++) { 440 if (device->comps[index].active_qps < 441 device->comps[min_index].active_qps) 442 min_index = index; 443 } 444 ib_conn->comp = &device->comps[min_index]; 445 ib_conn->comp->active_qps++; 446 mutex_unlock(&ig.connlist_mutex); 447 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); 448 449 init_attr.event_handler = iser_qp_event_callback; 450 init_attr.qp_context = (void *)ib_conn; 451 init_attr.send_cq = ib_conn->comp->cq; 452 init_attr.recv_cq = ib_conn->comp->cq; 453 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 454 init_attr.cap.max_send_sge = 2; 455 init_attr.cap.max_recv_sge = 1; 456 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 457 init_attr.qp_type = IB_QPT_RC; 458 if (ib_conn->pi_support) { 459 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 460 init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; 461 iser_conn->max_cmds = 462 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS); 463 } else { 464 if (ib_dev->attrs.max_qp_wr > ISER_QP_MAX_REQ_DTOS) { 465 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 466 iser_conn->max_cmds = 467 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS); 468 } else { 469 init_attr.cap.max_send_wr = ib_dev->attrs.max_qp_wr; 470 iser_conn->max_cmds = 471 ISER_GET_MAX_XMIT_CMDS(ib_dev->attrs.max_qp_wr); 472 iser_dbg("device %s supports max_send_wr %d\n", 473 device->ib_device->name, ib_dev->attrs.max_qp_wr); 474 } 475 } 476 477 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 478 if (ret) 479 goto out_err; 480 481 ib_conn->qp = ib_conn->cma_id->qp; 482 iser_info("setting conn %p cma_id %p qp %p\n", 483 ib_conn, ib_conn->cma_id, 484 ib_conn->cma_id->qp); 485 return ret; 486 487 out_err: 488 mutex_lock(&ig.connlist_mutex); 489 ib_conn->comp->active_qps--; 490 mutex_unlock(&ig.connlist_mutex); 491 iser_err("unable to alloc mem or create resource, err %d\n", ret); 492 493 return ret; 494 } 495 496 /** 497 * based on the resolved device node GUID see if there already allocated 498 * device for this device. If there's no such, create one. 499 */ 500 static 501 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 502 { 503 struct iser_device *device; 504 505 mutex_lock(&ig.device_list_mutex); 506 507 list_for_each_entry(device, &ig.device_list, ig_list) 508 /* find if there's a match using the node GUID */ 509 if (device->ib_device->node_guid == cma_id->device->node_guid) 510 goto inc_refcnt; 511 512 device = kzalloc(sizeof *device, GFP_KERNEL); 513 if (device == NULL) 514 goto out; 515 516 /* assign this device to the device */ 517 device->ib_device = cma_id->device; 518 /* init the device and link it into ig device list */ 519 if (iser_create_device_ib_res(device)) { 520 kfree(device); 521 device = NULL; 522 goto out; 523 } 524 list_add(&device->ig_list, &ig.device_list); 525 526 inc_refcnt: 527 device->refcount++; 528 out: 529 mutex_unlock(&ig.device_list_mutex); 530 return device; 531 } 532 533 /* if there's no demand for this device, release it */ 534 static void iser_device_try_release(struct iser_device *device) 535 { 536 mutex_lock(&ig.device_list_mutex); 537 device->refcount--; 538 iser_info("device %p refcount %d\n", device, device->refcount); 539 if (!device->refcount) { 540 iser_free_device_ib_res(device); 541 list_del(&device->ig_list); 542 kfree(device); 543 } 544 mutex_unlock(&ig.device_list_mutex); 545 } 546 547 /** 548 * Called with state mutex held 549 **/ 550 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, 551 enum iser_conn_state comp, 552 enum iser_conn_state exch) 553 { 554 int ret; 555 556 ret = (iser_conn->state == comp); 557 if (ret) 558 iser_conn->state = exch; 559 560 return ret; 561 } 562 563 void iser_release_work(struct work_struct *work) 564 { 565 struct iser_conn *iser_conn; 566 567 iser_conn = container_of(work, struct iser_conn, release_work); 568 569 /* Wait for conn_stop to complete */ 570 wait_for_completion(&iser_conn->stop_completion); 571 /* Wait for IB resouces cleanup to complete */ 572 wait_for_completion(&iser_conn->ib_completion); 573 574 mutex_lock(&iser_conn->state_mutex); 575 iser_conn->state = ISER_CONN_DOWN; 576 mutex_unlock(&iser_conn->state_mutex); 577 578 iser_conn_release(iser_conn); 579 } 580 581 /** 582 * iser_free_ib_conn_res - release IB related resources 583 * @iser_conn: iser connection struct 584 * @destroy: indicator if we need to try to release the 585 * iser device and memory regoins pool (only iscsi 586 * shutdown and DEVICE_REMOVAL will use this). 587 * 588 * This routine is called with the iser state mutex held 589 * so the cm_id removal is out of here. It is Safe to 590 * be invoked multiple times. 591 */ 592 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, 593 bool destroy) 594 { 595 struct ib_conn *ib_conn = &iser_conn->ib_conn; 596 struct iser_device *device = ib_conn->device; 597 598 iser_info("freeing conn %p cma_id %p qp %p\n", 599 iser_conn, ib_conn->cma_id, ib_conn->qp); 600 601 if (ib_conn->qp != NULL) { 602 mutex_lock(&ig.connlist_mutex); 603 ib_conn->comp->active_qps--; 604 mutex_unlock(&ig.connlist_mutex); 605 rdma_destroy_qp(ib_conn->cma_id); 606 ib_conn->qp = NULL; 607 } 608 609 if (destroy) { 610 if (iser_conn->rx_descs) 611 iser_free_rx_descriptors(iser_conn); 612 613 if (device != NULL) { 614 iser_device_try_release(device); 615 ib_conn->device = NULL; 616 } 617 } 618 } 619 620 /** 621 * Frees all conn objects and deallocs conn descriptor 622 */ 623 void iser_conn_release(struct iser_conn *iser_conn) 624 { 625 struct ib_conn *ib_conn = &iser_conn->ib_conn; 626 627 mutex_lock(&ig.connlist_mutex); 628 list_del(&iser_conn->conn_list); 629 mutex_unlock(&ig.connlist_mutex); 630 631 mutex_lock(&iser_conn->state_mutex); 632 /* In case we endup here without ep_disconnect being invoked. */ 633 if (iser_conn->state != ISER_CONN_DOWN) { 634 iser_warn("iser conn %p state %d, expected state down.\n", 635 iser_conn, iser_conn->state); 636 iscsi_destroy_endpoint(iser_conn->ep); 637 iser_conn->state = ISER_CONN_DOWN; 638 } 639 /* 640 * In case we never got to bind stage, we still need to 641 * release IB resources (which is safe to call more than once). 642 */ 643 iser_free_ib_conn_res(iser_conn, true); 644 mutex_unlock(&iser_conn->state_mutex); 645 646 if (ib_conn->cma_id != NULL) { 647 rdma_destroy_id(ib_conn->cma_id); 648 ib_conn->cma_id = NULL; 649 } 650 651 kfree(iser_conn); 652 } 653 654 /** 655 * triggers start of the disconnect procedures and wait for them to be done 656 * Called with state mutex held 657 */ 658 int iser_conn_terminate(struct iser_conn *iser_conn) 659 { 660 struct ib_conn *ib_conn = &iser_conn->ib_conn; 661 int err = 0; 662 663 /* terminate the iser conn only if the conn state is UP */ 664 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, 665 ISER_CONN_TERMINATING)) 666 return 0; 667 668 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 669 670 /* suspend queuing of new iscsi commands */ 671 if (iser_conn->iscsi_conn) 672 iscsi_suspend_queue(iser_conn->iscsi_conn); 673 674 /* 675 * In case we didn't already clean up the cma_id (peer initiated 676 * a disconnection), we need to Cause the CMA to change the QP 677 * state to ERROR. 678 */ 679 if (ib_conn->cma_id) { 680 err = rdma_disconnect(ib_conn->cma_id); 681 if (err) 682 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 683 iser_conn, err); 684 685 /* block until all flush errors are consumed */ 686 ib_drain_sq(ib_conn->qp); 687 } 688 689 return 1; 690 } 691 692 /** 693 * Called with state mutex held 694 **/ 695 static void iser_connect_error(struct rdma_cm_id *cma_id) 696 { 697 struct iser_conn *iser_conn; 698 699 iser_conn = (struct iser_conn *)cma_id->context; 700 iser_conn->state = ISER_CONN_TERMINATING; 701 } 702 703 static void 704 iser_calc_scsi_params(struct iser_conn *iser_conn, 705 unsigned int max_sectors) 706 { 707 struct iser_device *device = iser_conn->ib_conn.device; 708 unsigned short sg_tablesize, sup_sg_tablesize; 709 710 sg_tablesize = DIV_ROUND_UP(max_sectors * 512, SIZE_4K); 711 sup_sg_tablesize = min_t(unsigned, ISCSI_ISER_MAX_SG_TABLESIZE, 712 device->ib_device->attrs.max_fast_reg_page_list_len); 713 714 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 715 } 716 717 /** 718 * Called with state mutex held 719 **/ 720 static void iser_addr_handler(struct rdma_cm_id *cma_id) 721 { 722 struct iser_device *device; 723 struct iser_conn *iser_conn; 724 struct ib_conn *ib_conn; 725 int ret; 726 727 iser_conn = (struct iser_conn *)cma_id->context; 728 if (iser_conn->state != ISER_CONN_PENDING) 729 /* bailout */ 730 return; 731 732 ib_conn = &iser_conn->ib_conn; 733 device = iser_device_find_by_ib_device(cma_id); 734 if (!device) { 735 iser_err("device lookup/creation failed\n"); 736 iser_connect_error(cma_id); 737 return; 738 } 739 740 ib_conn->device = device; 741 742 /* connection T10-PI support */ 743 if (iser_pi_enable) { 744 if (!(device->ib_device->attrs.device_cap_flags & 745 IB_DEVICE_SIGNATURE_HANDOVER)) { 746 iser_warn("T10-PI requested but not supported on %s, " 747 "continue without T10-PI\n", 748 ib_conn->device->ib_device->name); 749 ib_conn->pi_support = false; 750 } else { 751 ib_conn->pi_support = true; 752 } 753 } 754 755 iser_calc_scsi_params(iser_conn, iser_max_sectors); 756 757 ret = rdma_resolve_route(cma_id, 1000); 758 if (ret) { 759 iser_err("resolve route failed: %d\n", ret); 760 iser_connect_error(cma_id); 761 return; 762 } 763 } 764 765 /** 766 * Called with state mutex held 767 **/ 768 static void iser_route_handler(struct rdma_cm_id *cma_id) 769 { 770 struct rdma_conn_param conn_param; 771 int ret; 772 struct iser_cm_hdr req_hdr; 773 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 774 struct ib_conn *ib_conn = &iser_conn->ib_conn; 775 struct iser_device *device = ib_conn->device; 776 777 if (iser_conn->state != ISER_CONN_PENDING) 778 /* bailout */ 779 return; 780 781 ret = iser_create_ib_conn_res(ib_conn); 782 if (ret) 783 goto failure; 784 785 memset(&conn_param, 0, sizeof conn_param); 786 conn_param.responder_resources = device->ib_device->attrs.max_qp_rd_atom; 787 conn_param.initiator_depth = 1; 788 conn_param.retry_count = 7; 789 conn_param.rnr_retry_count = 6; 790 791 memset(&req_hdr, 0, sizeof(req_hdr)); 792 req_hdr.flags = ISER_ZBVA_NOT_SUP; 793 if (!device->remote_inv_sup) 794 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 795 conn_param.private_data = (void *)&req_hdr; 796 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 797 798 ret = rdma_connect(cma_id, &conn_param); 799 if (ret) { 800 iser_err("failure connecting: %d\n", ret); 801 goto failure; 802 } 803 804 return; 805 failure: 806 iser_connect_error(cma_id); 807 } 808 809 static void iser_connected_handler(struct rdma_cm_id *cma_id, 810 const void *private_data) 811 { 812 struct iser_conn *iser_conn; 813 struct ib_qp_attr attr; 814 struct ib_qp_init_attr init_attr; 815 816 iser_conn = (struct iser_conn *)cma_id->context; 817 if (iser_conn->state != ISER_CONN_PENDING) 818 /* bailout */ 819 return; 820 821 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 822 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 823 824 if (private_data) { 825 u8 flags = *(u8 *)private_data; 826 827 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 828 } 829 830 iser_info("conn %p: negotiated %s invalidation\n", 831 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 832 833 iser_conn->state = ISER_CONN_UP; 834 complete(&iser_conn->up_completion); 835 } 836 837 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 838 { 839 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 840 841 if (iser_conn_terminate(iser_conn)) { 842 if (iser_conn->iscsi_conn) 843 iscsi_conn_failure(iser_conn->iscsi_conn, 844 ISCSI_ERR_CONN_FAILED); 845 else 846 iser_err("iscsi_iser connection isn't bound\n"); 847 } 848 } 849 850 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 851 bool destroy) 852 { 853 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 854 855 /* 856 * We are not guaranteed that we visited disconnected_handler 857 * by now, call it here to be safe that we handle CM drep 858 * and flush errors. 859 */ 860 iser_disconnected_handler(cma_id); 861 iser_free_ib_conn_res(iser_conn, destroy); 862 complete(&iser_conn->ib_completion); 863 }; 864 865 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 866 { 867 struct iser_conn *iser_conn; 868 int ret = 0; 869 870 iser_conn = (struct iser_conn *)cma_id->context; 871 iser_info("%s (%d): status %d conn %p id %p\n", 872 rdma_event_msg(event->event), event->event, 873 event->status, cma_id->context, cma_id); 874 875 mutex_lock(&iser_conn->state_mutex); 876 switch (event->event) { 877 case RDMA_CM_EVENT_ADDR_RESOLVED: 878 iser_addr_handler(cma_id); 879 break; 880 case RDMA_CM_EVENT_ROUTE_RESOLVED: 881 iser_route_handler(cma_id); 882 break; 883 case RDMA_CM_EVENT_ESTABLISHED: 884 iser_connected_handler(cma_id, event->param.conn.private_data); 885 break; 886 case RDMA_CM_EVENT_REJECTED: 887 iser_info("Connection rejected: %s\n", 888 rdma_reject_msg(cma_id, event->status)); 889 /* FALLTHROUGH */ 890 case RDMA_CM_EVENT_ADDR_ERROR: 891 case RDMA_CM_EVENT_ROUTE_ERROR: 892 case RDMA_CM_EVENT_CONNECT_ERROR: 893 case RDMA_CM_EVENT_UNREACHABLE: 894 iser_connect_error(cma_id); 895 break; 896 case RDMA_CM_EVENT_DISCONNECTED: 897 case RDMA_CM_EVENT_ADDR_CHANGE: 898 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 899 iser_cleanup_handler(cma_id, false); 900 break; 901 case RDMA_CM_EVENT_DEVICE_REMOVAL: 902 /* 903 * we *must* destroy the device as we cannot rely 904 * on iscsid to be around to initiate error handling. 905 * also if we are not in state DOWN implicitly destroy 906 * the cma_id. 907 */ 908 iser_cleanup_handler(cma_id, true); 909 if (iser_conn->state != ISER_CONN_DOWN) { 910 iser_conn->ib_conn.cma_id = NULL; 911 ret = 1; 912 } 913 break; 914 default: 915 iser_err("Unexpected RDMA CM event: %s (%d)\n", 916 rdma_event_msg(event->event), event->event); 917 break; 918 } 919 mutex_unlock(&iser_conn->state_mutex); 920 921 return ret; 922 } 923 924 void iser_conn_init(struct iser_conn *iser_conn) 925 { 926 struct ib_conn *ib_conn = &iser_conn->ib_conn; 927 928 iser_conn->state = ISER_CONN_INIT; 929 init_completion(&iser_conn->stop_completion); 930 init_completion(&iser_conn->ib_completion); 931 init_completion(&iser_conn->up_completion); 932 INIT_LIST_HEAD(&iser_conn->conn_list); 933 mutex_init(&iser_conn->state_mutex); 934 935 ib_conn->post_recv_buf_count = 0; 936 ib_conn->reg_cqe.done = iser_reg_comp; 937 } 938 939 /** 940 * starts the process of connecting to the target 941 * sleeps until the connection is established or rejected 942 */ 943 int iser_connect(struct iser_conn *iser_conn, 944 struct sockaddr *src_addr, 945 struct sockaddr *dst_addr, 946 int non_blocking) 947 { 948 struct ib_conn *ib_conn = &iser_conn->ib_conn; 949 int err = 0; 950 951 mutex_lock(&iser_conn->state_mutex); 952 953 sprintf(iser_conn->name, "%pISp", dst_addr); 954 955 iser_info("connecting to: %s\n", iser_conn->name); 956 957 /* the device is known only --after-- address resolution */ 958 ib_conn->device = NULL; 959 960 iser_conn->state = ISER_CONN_PENDING; 961 962 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 963 (void *)iser_conn, 964 RDMA_PS_TCP, IB_QPT_RC); 965 if (IS_ERR(ib_conn->cma_id)) { 966 err = PTR_ERR(ib_conn->cma_id); 967 iser_err("rdma_create_id failed: %d\n", err); 968 goto id_failure; 969 } 970 971 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 972 if (err) { 973 iser_err("rdma_resolve_addr failed: %d\n", err); 974 goto addr_failure; 975 } 976 977 if (!non_blocking) { 978 wait_for_completion_interruptible(&iser_conn->up_completion); 979 980 if (iser_conn->state != ISER_CONN_UP) { 981 err = -EIO; 982 goto connect_failure; 983 } 984 } 985 mutex_unlock(&iser_conn->state_mutex); 986 987 mutex_lock(&ig.connlist_mutex); 988 list_add(&iser_conn->conn_list, &ig.connlist); 989 mutex_unlock(&ig.connlist_mutex); 990 return 0; 991 992 id_failure: 993 ib_conn->cma_id = NULL; 994 addr_failure: 995 iser_conn->state = ISER_CONN_DOWN; 996 connect_failure: 997 mutex_unlock(&iser_conn->state_mutex); 998 iser_conn_release(iser_conn); 999 return err; 1000 } 1001 1002 int iser_post_recvl(struct iser_conn *iser_conn) 1003 { 1004 struct ib_conn *ib_conn = &iser_conn->ib_conn; 1005 struct iser_login_desc *desc = &iser_conn->login_desc; 1006 struct ib_recv_wr wr, *wr_failed; 1007 int ib_ret; 1008 1009 desc->sge.addr = desc->rsp_dma; 1010 desc->sge.length = ISER_RX_LOGIN_SIZE; 1011 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 1012 1013 desc->cqe.done = iser_login_rsp; 1014 wr.wr_cqe = &desc->cqe; 1015 wr.sg_list = &desc->sge; 1016 wr.num_sge = 1; 1017 wr.next = NULL; 1018 1019 ib_conn->post_recv_buf_count++; 1020 ib_ret = ib_post_recv(ib_conn->qp, &wr, &wr_failed); 1021 if (ib_ret) { 1022 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 1023 ib_conn->post_recv_buf_count--; 1024 } 1025 1026 return ib_ret; 1027 } 1028 1029 int iser_post_recvm(struct iser_conn *iser_conn, int count) 1030 { 1031 struct ib_conn *ib_conn = &iser_conn->ib_conn; 1032 unsigned int my_rx_head = iser_conn->rx_desc_head; 1033 struct iser_rx_desc *rx_desc; 1034 struct ib_recv_wr *wr, *wr_failed; 1035 int i, ib_ret; 1036 1037 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) { 1038 rx_desc = &iser_conn->rx_descs[my_rx_head]; 1039 rx_desc->cqe.done = iser_task_rsp; 1040 wr->wr_cqe = &rx_desc->cqe; 1041 wr->sg_list = &rx_desc->rx_sg; 1042 wr->num_sge = 1; 1043 wr->next = wr + 1; 1044 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; 1045 } 1046 1047 wr--; 1048 wr->next = NULL; /* mark end of work requests list */ 1049 1050 ib_conn->post_recv_buf_count += count; 1051 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &wr_failed); 1052 if (ib_ret) { 1053 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 1054 ib_conn->post_recv_buf_count -= count; 1055 } else 1056 iser_conn->rx_desc_head = my_rx_head; 1057 1058 return ib_ret; 1059 } 1060 1061 1062 /** 1063 * iser_start_send - Initiate a Send DTO operation 1064 * 1065 * returns 0 on success, -1 on failure 1066 */ 1067 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 1068 bool signal) 1069 { 1070 struct ib_send_wr *bad_wr, *wr = iser_tx_next_wr(tx_desc); 1071 int ib_ret; 1072 1073 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 1074 tx_desc->dma_addr, ISER_HEADERS_LEN, 1075 DMA_TO_DEVICE); 1076 1077 wr->next = NULL; 1078 wr->wr_cqe = &tx_desc->cqe; 1079 wr->sg_list = tx_desc->tx_sg; 1080 wr->num_sge = tx_desc->num_sge; 1081 wr->opcode = IB_WR_SEND; 1082 wr->send_flags = signal ? IB_SEND_SIGNALED : 0; 1083 1084 ib_ret = ib_post_send(ib_conn->qp, &tx_desc->wrs[0].send, &bad_wr); 1085 if (ib_ret) 1086 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 1087 ib_ret, bad_wr->opcode); 1088 1089 return ib_ret; 1090 } 1091 1092 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 1093 enum iser_data_dir cmd_dir, sector_t *sector) 1094 { 1095 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 1096 struct iser_fr_desc *desc = reg->mem_h; 1097 unsigned long sector_size = iser_task->sc->device->sector_size; 1098 struct ib_mr_status mr_status; 1099 int ret; 1100 1101 if (desc && desc->pi_ctx->sig_protected) { 1102 desc->pi_ctx->sig_protected = 0; 1103 ret = ib_check_mr_status(desc->pi_ctx->sig_mr, 1104 IB_MR_CHECK_SIG_STATUS, &mr_status); 1105 if (ret) { 1106 pr_err("ib_check_mr_status failed, ret %d\n", ret); 1107 goto err; 1108 } 1109 1110 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1111 sector_t sector_off = mr_status.sig_err.sig_err_offset; 1112 1113 sector_div(sector_off, sector_size + 8); 1114 *sector = scsi_get_lba(iser_task->sc) + sector_off; 1115 1116 pr_err("PI error found type %d at sector %llx " 1117 "expected %x vs actual %x\n", 1118 mr_status.sig_err.err_type, 1119 (unsigned long long)*sector, 1120 mr_status.sig_err.expected, 1121 mr_status.sig_err.actual); 1122 1123 switch (mr_status.sig_err.err_type) { 1124 case IB_SIG_BAD_GUARD: 1125 return 0x1; 1126 case IB_SIG_BAD_REFTAG: 1127 return 0x3; 1128 case IB_SIG_BAD_APPTAG: 1129 return 0x2; 1130 } 1131 } 1132 } 1133 1134 return 0; 1135 err: 1136 /* Not alot we can do here, return ambiguous guard error */ 1137 return 0x1; 1138 } 1139 1140 void iser_err_comp(struct ib_wc *wc, const char *type) 1141 { 1142 if (wc->status != IB_WC_WR_FLUSH_ERR) { 1143 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 1144 1145 iser_err("%s failure: %s (%d) vend_err %x\n", type, 1146 ib_wc_status_msg(wc->status), wc->status, 1147 wc->vendor_err); 1148 1149 if (iser_conn->iscsi_conn) 1150 iscsi_conn_failure(iser_conn->iscsi_conn, 1151 ISCSI_ERR_CONN_FAILED); 1152 } else { 1153 iser_dbg("%s failure: %s (%d)\n", type, 1154 ib_wc_status_msg(wc->status), wc->status); 1155 } 1156 } 1157