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 struct iser_fr_desc * 237 iser_create_fastreg_desc(struct iser_device *device, 238 struct ib_pd *pd, 239 bool pi_enable, 240 unsigned int size) 241 { 242 struct iser_fr_desc *desc; 243 struct ib_device *ib_dev = device->ib_device; 244 enum ib_mr_type mr_type; 245 int ret; 246 247 desc = kzalloc(sizeof(*desc), GFP_KERNEL); 248 if (!desc) 249 return ERR_PTR(-ENOMEM); 250 251 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG) 252 mr_type = IB_MR_TYPE_SG_GAPS; 253 else 254 mr_type = IB_MR_TYPE_MEM_REG; 255 256 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size); 257 if (IS_ERR(desc->rsc.mr)) { 258 ret = PTR_ERR(desc->rsc.mr); 259 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret); 260 goto err_alloc_mr; 261 } 262 263 if (pi_enable) { 264 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size); 265 if (IS_ERR(desc->rsc.sig_mr)) { 266 ret = PTR_ERR(desc->rsc.sig_mr); 267 iser_err("Failed to allocate sig_mr err=%d\n", ret); 268 goto err_alloc_mr_integrity; 269 } 270 } 271 desc->rsc.mr_valid = 0; 272 273 return desc; 274 275 err_alloc_mr_integrity: 276 ib_dereg_mr(desc->rsc.mr); 277 err_alloc_mr: 278 kfree(desc); 279 280 return ERR_PTR(ret); 281 } 282 283 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc) 284 { 285 struct iser_reg_resources *res = &desc->rsc; 286 287 ib_dereg_mr(res->mr); 288 if (res->sig_mr) { 289 ib_dereg_mr(res->sig_mr); 290 res->sig_mr = NULL; 291 } 292 kfree(desc); 293 } 294 295 /** 296 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors 297 * for fast registration work requests. 298 * returns 0 on success, or errno code on failure 299 */ 300 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, 301 unsigned cmds_max, 302 unsigned int size) 303 { 304 struct iser_device *device = ib_conn->device; 305 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 306 struct iser_fr_desc *desc; 307 int i, ret; 308 309 INIT_LIST_HEAD(&fr_pool->list); 310 INIT_LIST_HEAD(&fr_pool->all_list); 311 spin_lock_init(&fr_pool->lock); 312 fr_pool->size = 0; 313 for (i = 0; i < cmds_max; i++) { 314 desc = iser_create_fastreg_desc(device, device->pd, 315 ib_conn->pi_support, size); 316 if (IS_ERR(desc)) { 317 ret = PTR_ERR(desc); 318 goto err; 319 } 320 321 list_add_tail(&desc->list, &fr_pool->list); 322 list_add_tail(&desc->all_list, &fr_pool->all_list); 323 fr_pool->size++; 324 } 325 326 return 0; 327 328 err: 329 iser_free_fastreg_pool(ib_conn); 330 return ret; 331 } 332 333 /** 334 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors 335 */ 336 void iser_free_fastreg_pool(struct ib_conn *ib_conn) 337 { 338 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; 339 struct iser_fr_desc *desc, *tmp; 340 int i = 0; 341 342 if (list_empty(&fr_pool->all_list)) 343 return; 344 345 iser_info("freeing conn %p fr pool\n", ib_conn); 346 347 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) { 348 list_del(&desc->all_list); 349 iser_destroy_fastreg_desc(desc); 350 ++i; 351 } 352 353 if (i < fr_pool->size) 354 iser_warn("pool still has %d regions registered\n", 355 fr_pool->size - i); 356 } 357 358 /** 359 * iser_create_ib_conn_res - Queue-Pair (QP) 360 * 361 * returns 0 on success, -1 on failure 362 */ 363 static int iser_create_ib_conn_res(struct ib_conn *ib_conn) 364 { 365 struct iser_conn *iser_conn = to_iser_conn(ib_conn); 366 struct iser_device *device; 367 struct ib_device *ib_dev; 368 struct ib_qp_init_attr init_attr; 369 int ret = -ENOMEM; 370 int index, min_index = 0; 371 372 BUG_ON(ib_conn->device == NULL); 373 374 device = ib_conn->device; 375 ib_dev = device->ib_device; 376 377 memset(&init_attr, 0, sizeof init_attr); 378 379 mutex_lock(&ig.connlist_mutex); 380 /* select the CQ with the minimal number of usages */ 381 for (index = 0; index < device->comps_used; index++) { 382 if (device->comps[index].active_qps < 383 device->comps[min_index].active_qps) 384 min_index = index; 385 } 386 ib_conn->comp = &device->comps[min_index]; 387 ib_conn->comp->active_qps++; 388 mutex_unlock(&ig.connlist_mutex); 389 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); 390 391 init_attr.event_handler = iser_qp_event_callback; 392 init_attr.qp_context = (void *)ib_conn; 393 init_attr.send_cq = ib_conn->comp->cq; 394 init_attr.recv_cq = ib_conn->comp->cq; 395 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 396 init_attr.cap.max_send_sge = 2; 397 init_attr.cap.max_recv_sge = 1; 398 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 399 init_attr.qp_type = IB_QPT_RC; 400 if (ib_conn->pi_support) { 401 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1; 402 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN; 403 iser_conn->max_cmds = 404 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS); 405 } else { 406 if (ib_dev->attrs.max_qp_wr > ISER_QP_MAX_REQ_DTOS) { 407 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1; 408 iser_conn->max_cmds = 409 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS); 410 } else { 411 init_attr.cap.max_send_wr = ib_dev->attrs.max_qp_wr; 412 iser_conn->max_cmds = 413 ISER_GET_MAX_XMIT_CMDS(ib_dev->attrs.max_qp_wr); 414 iser_dbg("device %s supports max_send_wr %d\n", 415 dev_name(&device->ib_device->dev), 416 ib_dev->attrs.max_qp_wr); 417 } 418 } 419 420 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 421 if (ret) 422 goto out_err; 423 424 ib_conn->qp = ib_conn->cma_id->qp; 425 iser_info("setting conn %p cma_id %p qp %p\n", 426 ib_conn, ib_conn->cma_id, 427 ib_conn->cma_id->qp); 428 return ret; 429 430 out_err: 431 mutex_lock(&ig.connlist_mutex); 432 ib_conn->comp->active_qps--; 433 mutex_unlock(&ig.connlist_mutex); 434 iser_err("unable to alloc mem or create resource, err %d\n", ret); 435 436 return ret; 437 } 438 439 /** 440 * based on the resolved device node GUID see if there already allocated 441 * device for this device. If there's no such, create one. 442 */ 443 static 444 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 445 { 446 struct iser_device *device; 447 448 mutex_lock(&ig.device_list_mutex); 449 450 list_for_each_entry(device, &ig.device_list, ig_list) 451 /* find if there's a match using the node GUID */ 452 if (device->ib_device->node_guid == cma_id->device->node_guid) 453 goto inc_refcnt; 454 455 device = kzalloc(sizeof *device, GFP_KERNEL); 456 if (device == NULL) 457 goto out; 458 459 /* assign this device to the device */ 460 device->ib_device = cma_id->device; 461 /* init the device and link it into ig device list */ 462 if (iser_create_device_ib_res(device)) { 463 kfree(device); 464 device = NULL; 465 goto out; 466 } 467 list_add(&device->ig_list, &ig.device_list); 468 469 inc_refcnt: 470 device->refcount++; 471 out: 472 mutex_unlock(&ig.device_list_mutex); 473 return device; 474 } 475 476 /* if there's no demand for this device, release it */ 477 static void iser_device_try_release(struct iser_device *device) 478 { 479 mutex_lock(&ig.device_list_mutex); 480 device->refcount--; 481 iser_info("device %p refcount %d\n", device, device->refcount); 482 if (!device->refcount) { 483 iser_free_device_ib_res(device); 484 list_del(&device->ig_list); 485 kfree(device); 486 } 487 mutex_unlock(&ig.device_list_mutex); 488 } 489 490 /** 491 * Called with state mutex held 492 **/ 493 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn, 494 enum iser_conn_state comp, 495 enum iser_conn_state exch) 496 { 497 int ret; 498 499 ret = (iser_conn->state == comp); 500 if (ret) 501 iser_conn->state = exch; 502 503 return ret; 504 } 505 506 void iser_release_work(struct work_struct *work) 507 { 508 struct iser_conn *iser_conn; 509 510 iser_conn = container_of(work, struct iser_conn, release_work); 511 512 /* Wait for conn_stop to complete */ 513 wait_for_completion(&iser_conn->stop_completion); 514 /* Wait for IB resouces cleanup to complete */ 515 wait_for_completion(&iser_conn->ib_completion); 516 517 mutex_lock(&iser_conn->state_mutex); 518 iser_conn->state = ISER_CONN_DOWN; 519 mutex_unlock(&iser_conn->state_mutex); 520 521 iser_conn_release(iser_conn); 522 } 523 524 /** 525 * iser_free_ib_conn_res - release IB related resources 526 * @iser_conn: iser connection struct 527 * @destroy: indicator if we need to try to release the 528 * iser device and memory regoins pool (only iscsi 529 * shutdown and DEVICE_REMOVAL will use this). 530 * 531 * This routine is called with the iser state mutex held 532 * so the cm_id removal is out of here. It is Safe to 533 * be invoked multiple times. 534 */ 535 static void iser_free_ib_conn_res(struct iser_conn *iser_conn, 536 bool destroy) 537 { 538 struct ib_conn *ib_conn = &iser_conn->ib_conn; 539 struct iser_device *device = ib_conn->device; 540 541 iser_info("freeing conn %p cma_id %p qp %p\n", 542 iser_conn, ib_conn->cma_id, ib_conn->qp); 543 544 if (ib_conn->qp != NULL) { 545 mutex_lock(&ig.connlist_mutex); 546 ib_conn->comp->active_qps--; 547 mutex_unlock(&ig.connlist_mutex); 548 rdma_destroy_qp(ib_conn->cma_id); 549 ib_conn->qp = NULL; 550 } 551 552 if (destroy) { 553 if (iser_conn->rx_descs) 554 iser_free_rx_descriptors(iser_conn); 555 556 if (device != NULL) { 557 iser_device_try_release(device); 558 ib_conn->device = NULL; 559 } 560 } 561 } 562 563 /** 564 * Frees all conn objects and deallocs conn descriptor 565 */ 566 void iser_conn_release(struct iser_conn *iser_conn) 567 { 568 struct ib_conn *ib_conn = &iser_conn->ib_conn; 569 570 mutex_lock(&ig.connlist_mutex); 571 list_del(&iser_conn->conn_list); 572 mutex_unlock(&ig.connlist_mutex); 573 574 mutex_lock(&iser_conn->state_mutex); 575 /* In case we endup here without ep_disconnect being invoked. */ 576 if (iser_conn->state != ISER_CONN_DOWN) { 577 iser_warn("iser conn %p state %d, expected state down.\n", 578 iser_conn, iser_conn->state); 579 iscsi_destroy_endpoint(iser_conn->ep); 580 iser_conn->state = ISER_CONN_DOWN; 581 } 582 /* 583 * In case we never got to bind stage, we still need to 584 * release IB resources (which is safe to call more than once). 585 */ 586 iser_free_ib_conn_res(iser_conn, true); 587 mutex_unlock(&iser_conn->state_mutex); 588 589 if (ib_conn->cma_id != NULL) { 590 rdma_destroy_id(ib_conn->cma_id); 591 ib_conn->cma_id = NULL; 592 } 593 594 kfree(iser_conn); 595 } 596 597 /** 598 * triggers start of the disconnect procedures and wait for them to be done 599 * Called with state mutex held 600 */ 601 int iser_conn_terminate(struct iser_conn *iser_conn) 602 { 603 struct ib_conn *ib_conn = &iser_conn->ib_conn; 604 int err = 0; 605 606 /* terminate the iser conn only if the conn state is UP */ 607 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP, 608 ISER_CONN_TERMINATING)) 609 return 0; 610 611 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state); 612 613 /* suspend queuing of new iscsi commands */ 614 if (iser_conn->iscsi_conn) 615 iscsi_suspend_queue(iser_conn->iscsi_conn); 616 617 /* 618 * In case we didn't already clean up the cma_id (peer initiated 619 * a disconnection), we need to Cause the CMA to change the QP 620 * state to ERROR. 621 */ 622 if (ib_conn->cma_id) { 623 err = rdma_disconnect(ib_conn->cma_id); 624 if (err) 625 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 626 iser_conn, err); 627 628 /* block until all flush errors are consumed */ 629 ib_drain_sq(ib_conn->qp); 630 } 631 632 return 1; 633 } 634 635 /** 636 * Called with state mutex held 637 **/ 638 static void iser_connect_error(struct rdma_cm_id *cma_id) 639 { 640 struct iser_conn *iser_conn; 641 642 iser_conn = (struct iser_conn *)cma_id->context; 643 iser_conn->state = ISER_CONN_TERMINATING; 644 } 645 646 static void 647 iser_calc_scsi_params(struct iser_conn *iser_conn, 648 unsigned int max_sectors) 649 { 650 struct iser_device *device = iser_conn->ib_conn.device; 651 struct ib_device_attr *attr = &device->ib_device->attrs; 652 unsigned short sg_tablesize, sup_sg_tablesize; 653 unsigned short reserved_mr_pages; 654 u32 max_num_sg; 655 656 /* 657 * FRs without SG_GAPS or FMRs can only map up to a (device) page per 658 * entry, but if the first entry is misaligned we'll end up using two 659 * entries (head and tail) for a single page worth data, so one 660 * additional entry is required. 661 */ 662 if ((attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) && 663 (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)) 664 reserved_mr_pages = 0; 665 else 666 reserved_mr_pages = 1; 667 668 if (iser_conn->ib_conn.pi_support) 669 max_num_sg = attr->max_pi_fast_reg_page_list_len; 670 else 671 max_num_sg = attr->max_fast_reg_page_list_len; 672 673 sg_tablesize = DIV_ROUND_UP(max_sectors * 512, SIZE_4K); 674 if (attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) 675 sup_sg_tablesize = 676 min_t( 677 uint, ISCSI_ISER_MAX_SG_TABLESIZE, 678 max_num_sg - reserved_mr_pages); 679 else 680 sup_sg_tablesize = ISCSI_ISER_MAX_SG_TABLESIZE; 681 682 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize); 683 iser_conn->pages_per_mr = 684 iser_conn->scsi_sg_tablesize + reserved_mr_pages; 685 } 686 687 /** 688 * Called with state mutex held 689 **/ 690 static void iser_addr_handler(struct rdma_cm_id *cma_id) 691 { 692 struct iser_device *device; 693 struct iser_conn *iser_conn; 694 struct ib_conn *ib_conn; 695 int ret; 696 697 iser_conn = (struct iser_conn *)cma_id->context; 698 if (iser_conn->state != ISER_CONN_PENDING) 699 /* bailout */ 700 return; 701 702 ib_conn = &iser_conn->ib_conn; 703 device = iser_device_find_by_ib_device(cma_id); 704 if (!device) { 705 iser_err("device lookup/creation failed\n"); 706 iser_connect_error(cma_id); 707 return; 708 } 709 710 ib_conn->device = device; 711 712 /* connection T10-PI support */ 713 if (iser_pi_enable) { 714 if (!(device->ib_device->attrs.device_cap_flags & 715 IB_DEVICE_INTEGRITY_HANDOVER)) { 716 iser_warn("T10-PI requested but not supported on %s, " 717 "continue without T10-PI\n", 718 dev_name(&ib_conn->device->ib_device->dev)); 719 ib_conn->pi_support = false; 720 } else { 721 ib_conn->pi_support = true; 722 } 723 } 724 725 iser_calc_scsi_params(iser_conn, iser_max_sectors); 726 727 ret = rdma_resolve_route(cma_id, 1000); 728 if (ret) { 729 iser_err("resolve route failed: %d\n", ret); 730 iser_connect_error(cma_id); 731 return; 732 } 733 } 734 735 /** 736 * Called with state mutex held 737 **/ 738 static void iser_route_handler(struct rdma_cm_id *cma_id) 739 { 740 struct rdma_conn_param conn_param; 741 int ret; 742 struct iser_cm_hdr req_hdr; 743 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 744 struct ib_conn *ib_conn = &iser_conn->ib_conn; 745 struct iser_device *device = ib_conn->device; 746 747 if (iser_conn->state != ISER_CONN_PENDING) 748 /* bailout */ 749 return; 750 751 ret = iser_create_ib_conn_res(ib_conn); 752 if (ret) 753 goto failure; 754 755 memset(&conn_param, 0, sizeof conn_param); 756 conn_param.responder_resources = device->ib_device->attrs.max_qp_rd_atom; 757 conn_param.initiator_depth = 1; 758 conn_param.retry_count = 7; 759 conn_param.rnr_retry_count = 6; 760 761 memset(&req_hdr, 0, sizeof(req_hdr)); 762 req_hdr.flags = ISER_ZBVA_NOT_SUP; 763 if (!device->remote_inv_sup) 764 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP; 765 conn_param.private_data = (void *)&req_hdr; 766 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 767 768 ret = rdma_connect(cma_id, &conn_param); 769 if (ret) { 770 iser_err("failure connecting: %d\n", ret); 771 goto failure; 772 } 773 774 return; 775 failure: 776 iser_connect_error(cma_id); 777 } 778 779 static void iser_connected_handler(struct rdma_cm_id *cma_id, 780 const void *private_data) 781 { 782 struct iser_conn *iser_conn; 783 struct ib_qp_attr attr; 784 struct ib_qp_init_attr init_attr; 785 786 iser_conn = (struct iser_conn *)cma_id->context; 787 if (iser_conn->state != ISER_CONN_PENDING) 788 /* bailout */ 789 return; 790 791 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr); 792 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num); 793 794 if (private_data) { 795 u8 flags = *(u8 *)private_data; 796 797 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP); 798 } 799 800 iser_info("conn %p: negotiated %s invalidation\n", 801 iser_conn, iser_conn->snd_w_inv ? "remote" : "local"); 802 803 iser_conn->state = ISER_CONN_UP; 804 complete(&iser_conn->up_completion); 805 } 806 807 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 808 { 809 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 810 811 if (iser_conn_terminate(iser_conn)) { 812 if (iser_conn->iscsi_conn) 813 iscsi_conn_failure(iser_conn->iscsi_conn, 814 ISCSI_ERR_CONN_FAILED); 815 else 816 iser_err("iscsi_iser connection isn't bound\n"); 817 } 818 } 819 820 static void iser_cleanup_handler(struct rdma_cm_id *cma_id, 821 bool destroy) 822 { 823 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context; 824 825 /* 826 * We are not guaranteed that we visited disconnected_handler 827 * by now, call it here to be safe that we handle CM drep 828 * and flush errors. 829 */ 830 iser_disconnected_handler(cma_id); 831 iser_free_ib_conn_res(iser_conn, destroy); 832 complete(&iser_conn->ib_completion); 833 }; 834 835 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 836 { 837 struct iser_conn *iser_conn; 838 int ret = 0; 839 840 iser_conn = (struct iser_conn *)cma_id->context; 841 iser_info("%s (%d): status %d conn %p id %p\n", 842 rdma_event_msg(event->event), event->event, 843 event->status, cma_id->context, cma_id); 844 845 mutex_lock(&iser_conn->state_mutex); 846 switch (event->event) { 847 case RDMA_CM_EVENT_ADDR_RESOLVED: 848 iser_addr_handler(cma_id); 849 break; 850 case RDMA_CM_EVENT_ROUTE_RESOLVED: 851 iser_route_handler(cma_id); 852 break; 853 case RDMA_CM_EVENT_ESTABLISHED: 854 iser_connected_handler(cma_id, event->param.conn.private_data); 855 break; 856 case RDMA_CM_EVENT_REJECTED: 857 iser_info("Connection rejected: %s\n", 858 rdma_reject_msg(cma_id, event->status)); 859 /* FALLTHROUGH */ 860 case RDMA_CM_EVENT_ADDR_ERROR: 861 case RDMA_CM_EVENT_ROUTE_ERROR: 862 case RDMA_CM_EVENT_CONNECT_ERROR: 863 case RDMA_CM_EVENT_UNREACHABLE: 864 iser_connect_error(cma_id); 865 break; 866 case RDMA_CM_EVENT_DISCONNECTED: 867 case RDMA_CM_EVENT_ADDR_CHANGE: 868 case RDMA_CM_EVENT_TIMEWAIT_EXIT: 869 iser_cleanup_handler(cma_id, false); 870 break; 871 case RDMA_CM_EVENT_DEVICE_REMOVAL: 872 /* 873 * we *must* destroy the device as we cannot rely 874 * on iscsid to be around to initiate error handling. 875 * also if we are not in state DOWN implicitly destroy 876 * the cma_id. 877 */ 878 iser_cleanup_handler(cma_id, true); 879 if (iser_conn->state != ISER_CONN_DOWN) { 880 iser_conn->ib_conn.cma_id = NULL; 881 ret = 1; 882 } 883 break; 884 default: 885 iser_err("Unexpected RDMA CM event: %s (%d)\n", 886 rdma_event_msg(event->event), event->event); 887 break; 888 } 889 mutex_unlock(&iser_conn->state_mutex); 890 891 return ret; 892 } 893 894 void iser_conn_init(struct iser_conn *iser_conn) 895 { 896 struct ib_conn *ib_conn = &iser_conn->ib_conn; 897 898 iser_conn->state = ISER_CONN_INIT; 899 init_completion(&iser_conn->stop_completion); 900 init_completion(&iser_conn->ib_completion); 901 init_completion(&iser_conn->up_completion); 902 INIT_LIST_HEAD(&iser_conn->conn_list); 903 mutex_init(&iser_conn->state_mutex); 904 905 ib_conn->post_recv_buf_count = 0; 906 ib_conn->reg_cqe.done = iser_reg_comp; 907 } 908 909 /** 910 * starts the process of connecting to the target 911 * sleeps until the connection is established or rejected 912 */ 913 int iser_connect(struct iser_conn *iser_conn, 914 struct sockaddr *src_addr, 915 struct sockaddr *dst_addr, 916 int non_blocking) 917 { 918 struct ib_conn *ib_conn = &iser_conn->ib_conn; 919 int err = 0; 920 921 mutex_lock(&iser_conn->state_mutex); 922 923 sprintf(iser_conn->name, "%pISp", dst_addr); 924 925 iser_info("connecting to: %s\n", iser_conn->name); 926 927 /* the device is known only --after-- address resolution */ 928 ib_conn->device = NULL; 929 930 iser_conn->state = ISER_CONN_PENDING; 931 932 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler, 933 (void *)iser_conn, 934 RDMA_PS_TCP, IB_QPT_RC); 935 if (IS_ERR(ib_conn->cma_id)) { 936 err = PTR_ERR(ib_conn->cma_id); 937 iser_err("rdma_create_id failed: %d\n", err); 938 goto id_failure; 939 } 940 941 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000); 942 if (err) { 943 iser_err("rdma_resolve_addr failed: %d\n", err); 944 goto addr_failure; 945 } 946 947 if (!non_blocking) { 948 wait_for_completion_interruptible(&iser_conn->up_completion); 949 950 if (iser_conn->state != ISER_CONN_UP) { 951 err = -EIO; 952 goto connect_failure; 953 } 954 } 955 mutex_unlock(&iser_conn->state_mutex); 956 957 mutex_lock(&ig.connlist_mutex); 958 list_add(&iser_conn->conn_list, &ig.connlist); 959 mutex_unlock(&ig.connlist_mutex); 960 return 0; 961 962 id_failure: 963 ib_conn->cma_id = NULL; 964 addr_failure: 965 iser_conn->state = ISER_CONN_DOWN; 966 connect_failure: 967 mutex_unlock(&iser_conn->state_mutex); 968 iser_conn_release(iser_conn); 969 return err; 970 } 971 972 int iser_post_recvl(struct iser_conn *iser_conn) 973 { 974 struct ib_conn *ib_conn = &iser_conn->ib_conn; 975 struct iser_login_desc *desc = &iser_conn->login_desc; 976 struct ib_recv_wr wr; 977 int ib_ret; 978 979 desc->sge.addr = desc->rsp_dma; 980 desc->sge.length = ISER_RX_LOGIN_SIZE; 981 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey; 982 983 desc->cqe.done = iser_login_rsp; 984 wr.wr_cqe = &desc->cqe; 985 wr.sg_list = &desc->sge; 986 wr.num_sge = 1; 987 wr.next = NULL; 988 989 ib_conn->post_recv_buf_count++; 990 ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL); 991 if (ib_ret) { 992 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 993 ib_conn->post_recv_buf_count--; 994 } 995 996 return ib_ret; 997 } 998 999 int iser_post_recvm(struct iser_conn *iser_conn, int count) 1000 { 1001 struct ib_conn *ib_conn = &iser_conn->ib_conn; 1002 unsigned int my_rx_head = iser_conn->rx_desc_head; 1003 struct iser_rx_desc *rx_desc; 1004 struct ib_recv_wr *wr; 1005 int i, ib_ret; 1006 1007 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) { 1008 rx_desc = &iser_conn->rx_descs[my_rx_head]; 1009 rx_desc->cqe.done = iser_task_rsp; 1010 wr->wr_cqe = &rx_desc->cqe; 1011 wr->sg_list = &rx_desc->rx_sg; 1012 wr->num_sge = 1; 1013 wr->next = wr + 1; 1014 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask; 1015 } 1016 1017 wr--; 1018 wr->next = NULL; /* mark end of work requests list */ 1019 1020 ib_conn->post_recv_buf_count += count; 1021 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, NULL); 1022 if (ib_ret) { 1023 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 1024 ib_conn->post_recv_buf_count -= count; 1025 } else 1026 iser_conn->rx_desc_head = my_rx_head; 1027 1028 return ib_ret; 1029 } 1030 1031 1032 /** 1033 * iser_start_send - Initiate a Send DTO operation 1034 * 1035 * returns 0 on success, -1 on failure 1036 */ 1037 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, 1038 bool signal) 1039 { 1040 struct ib_send_wr *wr = &tx_desc->send_wr; 1041 struct ib_send_wr *first_wr; 1042 int ib_ret; 1043 1044 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 1045 tx_desc->dma_addr, ISER_HEADERS_LEN, 1046 DMA_TO_DEVICE); 1047 1048 wr->next = NULL; 1049 wr->wr_cqe = &tx_desc->cqe; 1050 wr->sg_list = tx_desc->tx_sg; 1051 wr->num_sge = tx_desc->num_sge; 1052 wr->opcode = IB_WR_SEND; 1053 wr->send_flags = signal ? IB_SEND_SIGNALED : 0; 1054 1055 if (tx_desc->inv_wr.next) 1056 first_wr = &tx_desc->inv_wr; 1057 else if (tx_desc->reg_wr.wr.next) 1058 first_wr = &tx_desc->reg_wr.wr; 1059 else 1060 first_wr = wr; 1061 1062 ib_ret = ib_post_send(ib_conn->qp, first_wr, NULL); 1063 if (ib_ret) 1064 iser_err("ib_post_send failed, ret:%d opcode:%d\n", 1065 ib_ret, wr->opcode); 1066 1067 return ib_ret; 1068 } 1069 1070 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, 1071 enum iser_data_dir cmd_dir, sector_t *sector) 1072 { 1073 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; 1074 struct iser_fr_desc *desc = reg->mem_h; 1075 unsigned long sector_size = iser_task->sc->device->sector_size; 1076 struct ib_mr_status mr_status; 1077 int ret; 1078 1079 if (desc && desc->sig_protected) { 1080 desc->sig_protected = 0; 1081 ret = ib_check_mr_status(desc->rsc.sig_mr, 1082 IB_MR_CHECK_SIG_STATUS, &mr_status); 1083 if (ret) { 1084 pr_err("ib_check_mr_status failed, ret %d\n", ret); 1085 /* Not a lot we can do, return ambiguous guard error */ 1086 *sector = 0; 1087 return 0x1; 1088 } 1089 1090 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1091 sector_t sector_off = mr_status.sig_err.sig_err_offset; 1092 1093 sector_div(sector_off, sector_size + 8); 1094 *sector = scsi_get_lba(iser_task->sc) + sector_off; 1095 1096 pr_err("PI error found type %d at sector %llx " 1097 "expected %x vs actual %x\n", 1098 mr_status.sig_err.err_type, 1099 (unsigned long long)*sector, 1100 mr_status.sig_err.expected, 1101 mr_status.sig_err.actual); 1102 1103 switch (mr_status.sig_err.err_type) { 1104 case IB_SIG_BAD_GUARD: 1105 return 0x1; 1106 case IB_SIG_BAD_REFTAG: 1107 return 0x3; 1108 case IB_SIG_BAD_APPTAG: 1109 return 0x2; 1110 } 1111 } 1112 } 1113 1114 return 0; 1115 } 1116 1117 void iser_err_comp(struct ib_wc *wc, const char *type) 1118 { 1119 if (wc->status != IB_WC_WR_FLUSH_ERR) { 1120 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context); 1121 1122 iser_err("%s failure: %s (%d) vend_err %#x\n", type, 1123 ib_wc_status_msg(wc->status), wc->status, 1124 wc->vendor_err); 1125 1126 if (iser_conn->iscsi_conn) 1127 iscsi_conn_failure(iser_conn->iscsi_conn, 1128 ISCSI_ERR_CONN_FAILED); 1129 } else { 1130 iser_dbg("%s failure: %s (%d)\n", type, 1131 ib_wc_status_msg(wc->status), wc->status); 1132 } 1133 } 1134