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 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, dev_name(&ib_dev->dev), 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 ib_register_event_handler(&device->event_handler); 110 return 0; 111 112 cq_err: 113 for (i = 0; i < device->comps_used; i++) { 114 struct iser_comp *comp = &device->comps[i]; 115 116 if (comp->cq) 117 ib_free_cq(comp->cq); 118 } 119 ib_dealloc_pd(device->pd); 120 pd_err: 121 kfree(device->comps); 122 comps_err: 123 iser_err("failed to allocate an IB resource\n"); 124 return -1; 125 } 126 127 /** 128 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 129 * CQ and PD created with the device associated with the adapator. 130 */ 131 static void iser_free_device_ib_res(struct iser_device *device) 132 { 133 int i; 134 135 for (i = 0; i < device->comps_used; i++) { 136 struct iser_comp *comp = &device->comps[i]; 137 138 ib_free_cq(comp->cq); 139 comp->cq = NULL; 140 } 141 142 ib_unregister_event_handler(&device->event_handler); 143 ib_dealloc_pd(device->pd); 144 145 kfree(device->comps); 146 device->comps = NULL; 147 device->pd = NULL; 148 } 149 150 /** 151 * iser_alloc_fmr_pool - Creates FMR pool and page_vector 152 * 153 * returns 0 on success, or errno code on failure 154 */ 155 int iser_alloc_fmr_pool(struct ib_conn *ib_conn, 156 unsigned cmds_max, 157 unsigned int size) 158 { 159 struct iser_device *device = ib_conn->device; 160 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 161 struct iser_page_vec *page_vec; 162 struct iser_fr_desc *desc; 163 struct ib_fmr_pool *fmr_pool; 164 struct ib_fmr_pool_param params; 165 int ret; 166 167 INIT_LIST_HEAD(&fr_pool->list); 168 spin_lock_init(&fr_pool->lock); 169 170 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 171 if (!desc) 172 return -ENOMEM; 173 174 page_vec = kmalloc(sizeof(*page_vec) + (sizeof(u64) * size), 175 GFP_KERNEL); 176 if (!page_vec) { 177 ret = -ENOMEM; 178 goto err_frpl; 179 } 180 181 page_vec->pages = (u64 *)(page_vec + 1); 182 183 params.page_shift = SHIFT_4K; 184 params.max_pages_per_fmr = size; 185 /* make the pool size twice the max number of SCSI commands * 186 * the ML is expected to queue, watermark for unmap at 50% */ 187 params.pool_size = cmds_max * 2; 188 params.dirty_watermark = cmds_max; 189 params.cache = 0; 190 params.flush_function = NULL; 191 params.access = (IB_ACCESS_LOCAL_WRITE | 192 IB_ACCESS_REMOTE_WRITE | 193 IB_ACCESS_REMOTE_READ); 194 195 fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 196 if (IS_ERR(fmr_pool)) { 197 ret = PTR_ERR(fmr_pool); 198 iser_err("FMR allocation failed, err %d\n", ret); 199 goto err_fmr; 200 } 201 202 desc->rsc.page_vec = page_vec; 203 desc->rsc.fmr_pool = fmr_pool; 204 list_add(&desc->list, &fr_pool->list); 205 206 return 0; 207 208 err_fmr: 209 kfree(page_vec); 210 err_frpl: 211 kfree(desc); 212 213 return ret; 214 } 215 216 /** 217 * iser_free_fmr_pool - releases the FMR pool and page vec 218 */ 219 void iser_free_fmr_pool(struct ib_conn *ib_conn) 220 { 221 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 222 struct iser_fr_desc *desc; 223 224 desc = list_first_entry(&fr_pool->list, 225 struct iser_fr_desc, list); 226 list_del(&desc->list); 227 228 iser_info("freeing conn %p fmr pool %p\n", 229 ib_conn, desc->rsc.fmr_pool); 230 231 ib_destroy_fmr_pool(desc->rsc.fmr_pool); 232 kfree(desc->rsc.page_vec); 233 kfree(desc); 234 } 235 236 static int 237 iser_alloc_reg_res(struct iser_device *device, 238 struct ib_pd *pd, 239 struct iser_reg_resources *res, 240 unsigned int size) 241 { 242 struct ib_device *ib_dev = device->ib_device; 243 enum ib_mr_type mr_type; 244 int ret; 245 246 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) 247 mr_type = IB_MR_TYPE_SG_GAPS; 248 else 249 mr_type = IB_MR_TYPE_MEM_REG; 250 251 res->mr = ib_alloc_mr(pd, mr_type, size); 252 if (IS_ERR(res->mr)) { 253 ret = PTR_ERR(res->mr); 254 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 255 return ret; 256 } 257 res->mr_valid = 0; 258 259 return 0; 260 } 261 262 static void 263 iser_free_reg_res(struct iser_reg_resources *rsc) 264 { 265 ib_dereg_mr(rsc->mr); 266 } 267 268 static int 269 iser_alloc_pi_ctx(struct iser_device *device, 270 struct ib_pd *pd, 271 struct iser_fr_desc *desc, 272 unsigned int size) 273 { 274 struct iser_pi_context *pi_ctx = NULL; 275 int ret; 276 277 desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); 278 if (!desc->pi_ctx) 279 return -ENOMEM; 280 281 pi_ctx = desc->pi_ctx; 282 283 ret = iser_alloc_reg_res(device, pd, &pi_ctx->rsc, size); 284 if (ret) { 285 iser_err("failed to allocate reg_resources\n"); 286 goto alloc_reg_res_err; 287 } 288 289 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2); 290 if (IS_ERR(pi_ctx->sig_mr)) { 291 ret = PTR_ERR(pi_ctx->sig_mr); 292 goto sig_mr_failure; 293 } 294 pi_ctx->sig_mr_valid = 0; 295 desc->pi_ctx->sig_protected = 0; 296 297 return 0; 298 299 sig_mr_failure: 300 iser_free_reg_res(&pi_ctx->rsc); 301 alloc_reg_res_err: 302 kfree(desc->pi_ctx); 303 304 return ret; 305 } 306 307 static void 308 iser_free_pi_ctx(struct iser_pi_context *pi_ctx) 309 { 310 iser_free_reg_res(&pi_ctx->rsc); 311 ib_dereg_mr(pi_ctx->sig_mr); 312 kfree(pi_ctx); 313 } 314 315 static struct iser_fr_desc * 316 iser_create_fastreg_desc(struct iser_device *device, 317 struct ib_pd *pd, 318 bool pi_enable, 319 unsigned int size) 320 { 321 struct iser_fr_desc *desc; 322 int ret; 323 324 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 325 if (!desc) 326 return ERR_PTR(-ENOMEM); 327 328 ret = iser_alloc_reg_res(device, pd, &desc->rsc, size); 329 if (ret) 330 goto reg_res_alloc_failure; 331 332 if (pi_enable) { 333 ret = iser_alloc_pi_ctx(device, pd, desc, size); 334 if (ret) 335 goto pi_ctx_alloc_failure; 336 } 337 338 return desc; 339 340 pi_ctx_alloc_failure: 341 iser_free_reg_res(&desc->rsc); 342 reg_res_alloc_failure: 343 kfree(desc); 344 345 return ERR_PTR(ret); 346 } 347 348 /** 349 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 350 * for fast registration work requests. 351 * returns 0 on success, or errno code on failure 352 */ 353 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 354 unsigned cmds_max, 355 unsigned int size) 356 { 357 struct iser_device *device = ib_conn->device; 358 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 359 struct iser_fr_desc *desc; 360 int i, ret; 361 362 INIT_LIST_HEAD(&fr_pool->list); 363 INIT_LIST_HEAD(&fr_pool->all_list); 364 spin_lock_init(&fr_pool->lock); 365 fr_pool->size = 0; 366 for (i = 0; i < cmds_max; i++) { 367 desc = iser_create_fastreg_desc(device, device->pd, 368 ib_conn->pi_support, size); 369 if (IS_ERR(desc)) { 370 ret = PTR_ERR(desc); 371 goto err; 372 } 373 374 list_add_tail(&desc->list, &fr_pool->list); 375 list_add_tail(&desc->all_list, &fr_pool->all_list); 376 fr_pool->size++; 377 } 378 379 return 0; 380 381 err: 382 iser_free_fastreg_pool(ib_conn); 383 return ret; 384 } 385 386 /** 387 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 388 */ 389 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 390 { 391 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 392 struct iser_fr_desc *desc, *tmp; 393 int i = 0; 394 395 if (list_empty(&fr_pool->all_list)) 396 return; 397 398 iser_info("freeing conn %p fr pool\n", ib_conn); 399 400 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 401 list_del(&desc->all_list); 402 iser_free_reg_res(&desc->rsc); 403 if (desc->pi_ctx) 404 iser_free_pi_ctx(desc->pi_ctx); 405 kfree(desc); 406 ++i; 407 } 408 409 if (i < fr_pool->size) 410 iser_warn("pool still has %d regions registered\n", 411 fr_pool->size - i); 412 } 413 414 /** 415 * iser_create_ib_conn_res - Queue-Pair (QP) 416 * 417 * returns 0 on success, -1 on failure 418 */ 419 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 420 { 421 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 422 struct iser_device *device; 423 struct ib_device *ib_dev; 424 struct ib_qp_init_attr init_attr; 425 int ret = -ENOMEM; 426 int index, min_index = 0; 427 428 BUG_ON(ib_conn->device == NULL); 429 430 device = ib_conn->device; 431 ib_dev = device->ib_device; 432 433 memset(&init_attr, 0, sizeof init_attr); 434 435 mutex_lock(&ig.connlist_mutex); 436 /* select the CQ with the minimal number of usages */ 437 for (index = 0; index < device->comps_used; index++) { 438 if (device->comps[index].active_qps < 439 device->comps[min_index].active_qps) 440 min_index = index; 441 } 442 ib_conn->comp = &device->comps[min_index]; 443 ib_conn->comp->active_qps++; 444 mutex_unlock(&ig.connlist_mutex); 445 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); 446 447 init_attr.event_handler = iser_qp_event_callback; 448 init_attr.qp_context = (void *)ib_conn; 449 init_attr.send_cq = ib_conn->comp->cq; 450 init_attr.recv_cq = ib_conn->comp->cq; 451 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 452 init_attr.cap.max_send_sge = 2; 453 init_attr.cap.max_recv_sge = 1; 454 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 455 init_attr.qp_type = IB_QPT_RC; 456 if (ib_conn->pi_support) { 457 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 458 init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; 459 iser_conn->max_cmds = 460 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS); 461 } else { 462 if (ib_dev->attrs.max_qp_wr > ISER_QP_MAX_REQ_DTOS) { 463 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 464 iser_conn->max_cmds = 465 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS); 466 } else { 467 init_attr.cap.max_send_wr = ib_dev->attrs.max_qp_wr; 468 iser_conn->max_cmds = 469 ISER_GET_MAX_XMIT_CMDS(ib_dev->attrs.max_qp_wr); 470 iser_dbg("device %s supports max_send_wr %d\n", 471 dev_name(&device->ib_device->dev), 472 ib_dev->attrs.max_qp_wr); 473 } 474 } 475 476 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 477 if (ret) 478 goto out_err; 479 480 ib_conn->qp = ib_conn->cma_id->qp; 481 iser_info("setting conn %p cma_id %p qp %p\n", 482 ib_conn, ib_conn->cma_id, 483 ib_conn->cma_id->qp); 484 return ret; 485 486 out_err: 487 mutex_lock(&ig.connlist_mutex); 488 ib_conn->comp->active_qps--; 489 mutex_unlock(&ig.connlist_mutex); 490 iser_err("unable to alloc mem or create resource, err %d\n", ret); 491 492 return ret; 493 } 494 495 /** 496 * based on the resolved device node GUID see if there already allocated 497 * device for this device. If there's no such, create one. 498 */ 499 static 500 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 501 { 502 struct iser_device *device; 503 504 mutex_lock(&ig.device_list_mutex); 505 506 list_for_each_entry(device, &ig.device_list, ig_list) 507 /* find if there's a match using the node GUID */ 508 if (device->ib_device->node_guid == cma_id->device->node_guid) 509 goto inc_refcnt; 510 511 device = kzalloc(sizeof *device, GFP_KERNEL); 512 if (device == NULL) 513 goto out; 514 515 /* assign this device to the device */ 516 device->ib_device = cma_id->device; 517 /* init the device and link it into ig device list */ 518 if (iser_create_device_ib_res(device)) { 519 kfree(device); 520 device = NULL; 521 goto out; 522 } 523 list_add(&device->ig_list, &ig.device_list); 524 525 inc_refcnt: 526 device->refcount++; 527 out: 528 mutex_unlock(&ig.device_list_mutex); 529 return device; 530 } 531 532 /* if there's no demand for this device, release it */ 533 static void iser_device_try_release(struct iser_device *device) 534 { 535 mutex_lock(&ig.device_list_mutex); 536 device->refcount--; 537 iser_info("device %p refcount %d\n", device, device->refcount); 538 if (!device->refcount) { 539 iser_free_device_ib_res(device); 540 list_del(&device->ig_list); 541 kfree(device); 542 } 543 mutex_unlock(&ig.device_list_mutex); 544 } 545 546 /** 547 * Called with state mutex held 548 **/ 549 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, 550 enum iser_conn_state comp, 551 enum iser_conn_state exch) 552 { 553 int ret; 554 555 ret = (iser_conn->state == comp); 556 if (ret) 557 iser_conn->state = exch; 558 559 return ret; 560 } 561 562 void iser_release_work(struct work_struct *work) 563 { 564 struct iser_conn *iser_conn; 565 566 iser_conn = container_of(work, struct iser_conn, release_work); 567 568 /* Wait for conn_stop to complete */ 569 wait_for_completion(&iser_conn->stop_completion); 570 /* Wait for IB resouces cleanup to complete */ 571 wait_for_completion(&iser_conn->ib_completion); 572 573 mutex_lock(&iser_conn->state_mutex); 574 iser_conn->state = ISER_CONN_DOWN; 575 mutex_unlock(&iser_conn->state_mutex); 576 577 iser_conn_release(iser_conn); 578 } 579 580 /** 581 * iser_free_ib_conn_res - release IB related resources 582 * @iser_conn: iser connection struct 583 * @destroy: indicator if we need to try to release the 584 * iser device and memory regoins pool (only iscsi 585 * shutdown and DEVICE_REMOVAL will use this). 586 * 587 * This routine is called with the iser state mutex held 588 * so the cm_id removal is out of here. It is Safe to 589 * be invoked multiple times. 590 */ 591 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, 592 bool destroy) 593 { 594 struct ib_conn *ib_conn = &iser_conn->ib_conn; 595 struct iser_device *device = ib_conn->device; 596 597 iser_info("freeing conn %p cma_id %p qp %p\n", 598 iser_conn, ib_conn->cma_id, ib_conn->qp); 599 600 if (ib_conn->qp != NULL) { 601 mutex_lock(&ig.connlist_mutex); 602 ib_conn->comp->active_qps--; 603 mutex_unlock(&ig.connlist_mutex); 604 rdma_destroy_qp(ib_conn->cma_id); 605 ib_conn->qp = NULL; 606 } 607 608 if (destroy) { 609 if (iser_conn->rx_descs) 610 iser_free_rx_descriptors(iser_conn); 611 612 if (device != NULL) { 613 iser_device_try_release(device); 614 ib_conn->device = NULL; 615 } 616 } 617 } 618 619 /** 620 * Frees all conn objects and deallocs conn descriptor 621 */ 622 void iser_conn_release(struct iser_conn *iser_conn) 623 { 624 struct ib_conn *ib_conn = &iser_conn->ib_conn; 625 626 mutex_lock(&ig.connlist_mutex); 627 list_del(&iser_conn->conn_list); 628 mutex_unlock(&ig.connlist_mutex); 629 630 mutex_lock(&iser_conn->state_mutex); 631 /* In case we endup here without ep_disconnect being invoked. */ 632 if (iser_conn->state != ISER_CONN_DOWN) { 633 iser_warn("iser conn %p state %d, expected state down.\n", 634 iser_conn, iser_conn->state); 635 iscsi_destroy_endpoint(iser_conn->ep); 636 iser_conn->state = ISER_CONN_DOWN; 637 } 638 /* 639 * In case we never got to bind stage, we still need to 640 * release IB resources (which is safe to call more than once). 641 */ 642 iser_free_ib_conn_res(iser_conn, true); 643 mutex_unlock(&iser_conn->state_mutex); 644 645 if (ib_conn->cma_id != NULL) { 646 rdma_destroy_id(ib_conn->cma_id); 647 ib_conn->cma_id = NULL; 648 } 649 650 kfree(iser_conn); 651 } 652 653 /** 654 * triggers start of the disconnect procedures and wait for them to be done 655 * Called with state mutex held 656 */ 657 int iser_conn_terminate(struct iser_conn *iser_conn) 658 { 659 struct ib_conn *ib_conn = &iser_conn->ib_conn; 660 int err = 0; 661 662 /* terminate the iser conn only if the conn state is UP */ 663 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, 664 ISER_CONN_TERMINATING)) 665 return 0; 666 667 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 668 669 /* suspend queuing of new iscsi commands */ 670 if (iser_conn->iscsi_conn) 671 iscsi_suspend_queue(iser_conn->iscsi_conn); 672 673 /* 674 * In case we didn't already clean up the cma_id (peer initiated 675 * a disconnection), we need to Cause the CMA to change the QP 676 * state to ERROR. 677 */ 678 if (ib_conn->cma_id) { 679 err = rdma_disconnect(ib_conn->cma_id); 680 if (err) 681 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 682 iser_conn, err); 683 684 /* block until all flush errors are consumed */ 685 ib_drain_sq(ib_conn->qp); 686 } 687 688 return 1; 689 } 690 691 /** 692 * Called with state mutex held 693 **/ 694 static void iser_connect_error(struct rdma_cm_id *cma_id) 695 { 696 struct iser_conn *iser_conn; 697 698 iser_conn = (struct iser_conn *)cma_id->context; 699 iser_conn->state = ISER_CONN_TERMINATING; 700 } 701 702 static void 703 iser_calc_scsi_params(struct iser_conn *iser_conn, 704 unsigned int max_sectors) 705 { 706 struct iser_device *device = iser_conn->ib_conn.device; 707 struct ib_device_attr *attr = &device->ib_device->attrs; 708 unsigned short sg_tablesize, sup_sg_tablesize; 709 unsigned short reserved_mr_pages; 710 711 /* 712 * FRs without SG_GAPS or FMRs can only map up to a (device) page per 713 * entry, but if the first entry is misaligned we'll end up using two 714 * entries (head and tail) for a single page worth data, so one 715 * additional entry is required. 716 */ 717 if ((attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) && 718 (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)) 719 reserved_mr_pages = 0; 720 else 721 reserved_mr_pages = 1; 722 723 sg_tablesize = DIV_ROUND_UP(max_sectors * 512, SIZE_4K); 724 if (attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) 725 sup_sg_tablesize = 726 min_t( 727 uint, ISCSI_ISER_MAX_SG_TABLESIZE, 728 attr->max_fast_reg_page_list_len - reserved_mr_pages); 729 else 730 sup_sg_tablesize = ISCSI_ISER_MAX_SG_TABLESIZE; 731 732 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 733 iser_conn->pages_per_mr = 734 iser_conn->scsi_sg_tablesize + reserved_mr_pages; 735 } 736 737 /** 738 * Called with state mutex held 739 **/ 740 static void iser_addr_handler(struct rdma_cm_id *cma_id) 741 { 742 struct iser_device *device; 743 struct iser_conn *iser_conn; 744 struct ib_conn *ib_conn; 745 int ret; 746 747 iser_conn = (struct iser_conn *)cma_id->context; 748 if (iser_conn->state != ISER_CONN_PENDING) 749 /* bailout */ 750 return; 751 752 ib_conn = &iser_conn->ib_conn; 753 device = iser_device_find_by_ib_device(cma_id); 754 if (!device) { 755 iser_err("device lookup/creation failed\n"); 756 iser_connect_error(cma_id); 757 return; 758 } 759 760 ib_conn->device = device; 761 762 /* connection T10-PI support */ 763 if (iser_pi_enable) { 764 if (!(device->ib_device->attrs.device_cap_flags & 765 IB_DEVICE_SIGNATURE_HANDOVER)) { 766 iser_warn("T10-PI requested but not supported on %s, " 767 "continue without T10-PI\n", 768 dev_name(&ib_conn->device->ib_device->dev)); 769 ib_conn->pi_support = false; 770 } else { 771 ib_conn->pi_support = true; 772 } 773 } 774 775 iser_calc_scsi_params(iser_conn, iser_max_sectors); 776 777 ret = rdma_resolve_route(cma_id, 1000); 778 if (ret) { 779 iser_err("resolve route failed: %d\n", ret); 780 iser_connect_error(cma_id); 781 return; 782 } 783 } 784 785 /** 786 * Called with state mutex held 787 **/ 788 static void iser_route_handler(struct rdma_cm_id *cma_id) 789 { 790 struct rdma_conn_param conn_param; 791 int ret; 792 struct iser_cm_hdr req_hdr; 793 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 794 struct ib_conn *ib_conn = &iser_conn->ib_conn; 795 struct iser_device *device = ib_conn->device; 796 797 if (iser_conn->state != ISER_CONN_PENDING) 798 /* bailout */ 799 return; 800 801 ret = iser_create_ib_conn_res(ib_conn); 802 if (ret) 803 goto failure; 804 805 memset(&conn_param, 0, sizeof conn_param); 806 conn_param.responder_resources = device->ib_device->attrs.max_qp_rd_atom; 807 conn_param.initiator_depth = 1; 808 conn_param.retry_count = 7; 809 conn_param.rnr_retry_count = 6; 810 811 memset(&req_hdr, 0, sizeof(req_hdr)); 812 req_hdr.flags = ISER_ZBVA_NOT_SUP; 813 if (!device->remote_inv_sup) 814 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 815 conn_param.private_data = (void *)&req_hdr; 816 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 817 818 ret = rdma_connect(cma_id, &conn_param); 819 if (ret) { 820 iser_err("failure connecting: %d\n", ret); 821 goto failure; 822 } 823 824 return; 825 failure: 826 iser_connect_error(cma_id); 827 } 828 829 static void iser_connected_handler(struct rdma_cm_id *cma_id, 830 const void *private_data) 831 { 832 struct iser_conn *iser_conn; 833 struct ib_qp_attr attr; 834 struct ib_qp_init_attr init_attr; 835 836 iser_conn = (struct iser_conn *)cma_id->context; 837 if (iser_conn->state != ISER_CONN_PENDING) 838 /* bailout */ 839 return; 840 841 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 842 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 843 844 if (private_data) { 845 u8 flags = *(u8 *)private_data; 846 847 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 848 } 849 850 iser_info("conn %p: negotiated %s invalidation\n", 851 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 852 853 iser_conn->state = ISER_CONN_UP; 854 complete(&iser_conn->up_completion); 855 } 856 857 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 858 { 859 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 860 861 if (iser_conn_terminate(iser_conn)) { 862 if (iser_conn->iscsi_conn) 863 iscsi_conn_failure(iser_conn->iscsi_conn, 864 ISCSI_ERR_CONN_FAILED); 865 else 866 iser_err("iscsi_iser connection isn't bound\n"); 867 } 868 } 869 870 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 871 bool destroy) 872 { 873 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 874 875 /* 876 * We are not guaranteed that we visited disconnected_handler 877 * by now, call it here to be safe that we handle CM drep 878 * and flush errors. 879 */ 880 iser_disconnected_handler(cma_id); 881 iser_free_ib_conn_res(iser_conn, destroy); 882 complete(&iser_conn->ib_completion); 883 }; 884 885 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 886 { 887 struct iser_conn *iser_conn; 888 int ret = 0; 889 890 iser_conn = (struct iser_conn *)cma_id->context; 891 iser_info("%s (%d): status %d conn %p id %p\n", 892 rdma_event_msg(event->event), event->event, 893 event->status, cma_id->context, cma_id); 894 895 mutex_lock(&iser_conn->state_mutex); 896 switch (event->event) { 897 case RDMA_CM_EVENT_ADDR_RESOLVED: 898 iser_addr_handler(cma_id); 899 break; 900 case RDMA_CM_EVENT_ROUTE_RESOLVED: 901 iser_route_handler(cma_id); 902 break; 903 case RDMA_CM_EVENT_ESTABLISHED: 904 iser_connected_handler(cma_id, event->param.conn.private_data); 905 break; 906 case RDMA_CM_EVENT_REJECTED: 907 iser_info("Connection rejected: %s\n", 908 rdma_reject_msg(cma_id, event->status)); 909 /* FALLTHROUGH */ 910 case RDMA_CM_EVENT_ADDR_ERROR: 911 case RDMA_CM_EVENT_ROUTE_ERROR: 912 case RDMA_CM_EVENT_CONNECT_ERROR: 913 case RDMA_CM_EVENT_UNREACHABLE: 914 iser_connect_error(cma_id); 915 break; 916 case RDMA_CM_EVENT_DISCONNECTED: 917 case RDMA_CM_EVENT_ADDR_CHANGE: 918 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 919 iser_cleanup_handler(cma_id, false); 920 break; 921 case RDMA_CM_EVENT_DEVICE_REMOVAL: 922 /* 923 * we *must* destroy the device as we cannot rely 924 * on iscsid to be around to initiate error handling. 925 * also if we are not in state DOWN implicitly destroy 926 * the cma_id. 927 */ 928 iser_cleanup_handler(cma_id, true); 929 if (iser_conn->state != ISER_CONN_DOWN) { 930 iser_conn->ib_conn.cma_id = NULL; 931 ret = 1; 932 } 933 break; 934 default: 935 iser_err("Unexpected RDMA CM event: %s (%d)\n", 936 rdma_event_msg(event->event), event->event); 937 break; 938 } 939 mutex_unlock(&iser_conn->state_mutex); 940 941 return ret; 942 } 943 944 void iser_conn_init(struct iser_conn *iser_conn) 945 { 946 struct ib_conn *ib_conn = &iser_conn->ib_conn; 947 948 iser_conn->state = ISER_CONN_INIT; 949 init_completion(&iser_conn->stop_completion); 950 init_completion(&iser_conn->ib_completion); 951 init_completion(&iser_conn->up_completion); 952 INIT_LIST_HEAD(&iser_conn->conn_list); 953 mutex_init(&iser_conn->state_mutex); 954 955 ib_conn->post_recv_buf_count = 0; 956 ib_conn->reg_cqe.done = iser_reg_comp; 957 } 958 959 /** 960 * starts the process of connecting to the target 961 * sleeps until the connection is established or rejected 962 */ 963 int iser_connect(struct iser_conn *iser_conn, 964 struct sockaddr *src_addr, 965 struct sockaddr *dst_addr, 966 int non_blocking) 967 { 968 struct ib_conn *ib_conn = &iser_conn->ib_conn; 969 int err = 0; 970 971 mutex_lock(&iser_conn->state_mutex); 972 973 sprintf(iser_conn->name, "%pISp", dst_addr); 974 975 iser_info("connecting to: %s\n", iser_conn->name); 976 977 /* the device is known only --after-- address resolution */ 978 ib_conn->device = NULL; 979 980 iser_conn->state = ISER_CONN_PENDING; 981 982 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 983 (void *)iser_conn, 984 RDMA_PS_TCP, IB_QPT_RC); 985 if (IS_ERR(ib_conn->cma_id)) { 986 err = PTR_ERR(ib_conn->cma_id); 987 iser_err("rdma_create_id failed: %d\n", err); 988 goto id_failure; 989 } 990 991 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 992 if (err) { 993 iser_err("rdma_resolve_addr failed: %d\n", err); 994 goto addr_failure; 995 } 996 997 if (!non_blocking) { 998 wait_for_completion_interruptible(&iser_conn->up_completion); 999 1000 if (iser_conn->state != ISER_CONN_UP) { 1001 err = -EIO; 1002 goto connect_failure; 1003 } 1004 } 1005 mutex_unlock(&iser_conn->state_mutex); 1006 1007 mutex_lock(&ig.connlist_mutex); 1008 list_add(&iser_conn->conn_list, &ig.connlist); 1009 mutex_unlock(&ig.connlist_mutex); 1010 return 0; 1011 1012 id_failure: 1013 ib_conn->cma_id = NULL; 1014 addr_failure: 1015 iser_conn->state = ISER_CONN_DOWN; 1016 connect_failure: 1017 mutex_unlock(&iser_conn->state_mutex); 1018 iser_conn_release(iser_conn); 1019 return err; 1020 } 1021 1022 int iser_post_recvl(struct iser_conn *iser_conn) 1023 { 1024 struct ib_conn *ib_conn = &iser_conn->ib_conn; 1025 struct iser_login_desc *desc = &iser_conn->login_desc; 1026 struct ib_recv_wr wr; 1027 int ib_ret; 1028 1029 desc->sge.addr = desc->rsp_dma; 1030 desc->sge.length = ISER_RX_LOGIN_SIZE; 1031 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 1032 1033 desc->cqe.done = iser_login_rsp; 1034 wr.wr_cqe = &desc->cqe; 1035 wr.sg_list = &desc->sge; 1036 wr.num_sge = 1; 1037 wr.next = NULL; 1038 1039 ib_conn->post_recv_buf_count++; 1040 ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL); 1041 if (ib_ret) { 1042 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 1043 ib_conn->post_recv_buf_count--; 1044 } 1045 1046 return ib_ret; 1047 } 1048 1049 int iser_post_recvm(struct iser_conn *iser_conn, int count) 1050 { 1051 struct ib_conn *ib_conn = &iser_conn->ib_conn; 1052 unsigned int my_rx_head = iser_conn->rx_desc_head; 1053 struct iser_rx_desc *rx_desc; 1054 struct ib_recv_wr *wr; 1055 int i, ib_ret; 1056 1057 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) { 1058 rx_desc = &iser_conn->rx_descs[my_rx_head]; 1059 rx_desc->cqe.done = iser_task_rsp; 1060 wr->wr_cqe = &rx_desc->cqe; 1061 wr->sg_list = &rx_desc->rx_sg; 1062 wr->num_sge = 1; 1063 wr->next = wr + 1; 1064 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; 1065 } 1066 1067 wr--; 1068 wr->next = NULL; /* mark end of work requests list */ 1069 1070 ib_conn->post_recv_buf_count += count; 1071 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, NULL); 1072 if (ib_ret) { 1073 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 1074 ib_conn->post_recv_buf_count -= count; 1075 } else 1076 iser_conn->rx_desc_head = my_rx_head; 1077 1078 return ib_ret; 1079 } 1080 1081 1082 /** 1083 * iser_start_send - Initiate a Send DTO operation 1084 * 1085 * returns 0 on success, -1 on failure 1086 */ 1087 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 1088 bool signal) 1089 { 1090 struct ib_send_wr *wr = iser_tx_next_wr(tx_desc); 1091 int ib_ret; 1092 1093 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 1094 tx_desc->dma_addr, ISER_HEADERS_LEN, 1095 DMA_TO_DEVICE); 1096 1097 wr->next = NULL; 1098 wr->wr_cqe = &tx_desc->cqe; 1099 wr->sg_list = tx_desc->tx_sg; 1100 wr->num_sge = tx_desc->num_sge; 1101 wr->opcode = IB_WR_SEND; 1102 wr->send_flags = signal ? IB_SEND_SIGNALED : 0; 1103 1104 ib_ret = ib_post_send(ib_conn->qp, &tx_desc->wrs[0].send, NULL); 1105 if (ib_ret) 1106 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 1107 ib_ret, wr->opcode); 1108 1109 return ib_ret; 1110 } 1111 1112 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 1113 enum iser_data_dir cmd_dir, sector_t *sector) 1114 { 1115 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 1116 struct iser_fr_desc *desc = reg->mem_h; 1117 unsigned long sector_size = iser_task->sc->device->sector_size; 1118 struct ib_mr_status mr_status; 1119 int ret; 1120 1121 if (desc && desc->pi_ctx->sig_protected) { 1122 desc->pi_ctx->sig_protected = 0; 1123 ret = ib_check_mr_status(desc->pi_ctx->sig_mr, 1124 IB_MR_CHECK_SIG_STATUS, &mr_status); 1125 if (ret) { 1126 pr_err("ib_check_mr_status failed, ret %d\n", ret); 1127 /* Not a lot we can do, return ambiguous guard error */ 1128 *sector = 0; 1129 return 0x1; 1130 } 1131 1132 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1133 sector_t sector_off = mr_status.sig_err.sig_err_offset; 1134 1135 sector_div(sector_off, sector_size + 8); 1136 *sector = scsi_get_lba(iser_task->sc) + sector_off; 1137 1138 pr_err("PI error found type %d at sector %llx " 1139 "expected %x vs actual %x\n", 1140 mr_status.sig_err.err_type, 1141 (unsigned long long)*sector, 1142 mr_status.sig_err.expected, 1143 mr_status.sig_err.actual); 1144 1145 switch (mr_status.sig_err.err_type) { 1146 case IB_SIG_BAD_GUARD: 1147 return 0x1; 1148 case IB_SIG_BAD_REFTAG: 1149 return 0x3; 1150 case IB_SIG_BAD_APPTAG: 1151 return 0x2; 1152 } 1153 } 1154 } 1155 1156 return 0; 1157 } 1158 1159 void iser_err_comp(struct ib_wc *wc, const char *type) 1160 { 1161 if (wc->status != IB_WC_WR_FLUSH_ERR) { 1162 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 1163 1164 iser_err("%s failure: %s (%d) vend_err %#x\n", type, 1165 ib_wc_status_msg(wc->status), wc->status, 1166 wc->vendor_err); 1167 1168 if (iser_conn->iscsi_conn) 1169 iscsi_conn_failure(iser_conn->iscsi_conn, 1170 ISCSI_ERR_CONN_FAILED); 1171 } else { 1172 iser_dbg("%s failure: %s (%d)\n", type, 1173 ib_wc_status_msg(wc->status), wc->status); 1174 } 1175 } 1176