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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 two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * 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 OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34#include <linux/kernel.h>35#include <linux/slab.h>36#include <linux/delay.h>37 38#include "iscsi_iser.h"39 40static void iser_qp_event_callback(struct ib_event *cause, void *context)41{42 iser_err("qp event %s (%d)\n",43 ib_event_msg(cause->event), cause->event);44}45 46static void iser_event_handler(struct ib_event_handler *handler,47 struct ib_event *event)48{49 iser_err("async event %s (%d) on device %s port %d\n",50 ib_event_msg(event->event), event->event,51 dev_name(&event->device->dev), event->element.port_num);52}53 54/*55 * iser_create_device_ib_res - creates Protection Domain (PD), Completion56 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with57 * the adaptor.58 *59 * Return: 0 on success, -1 on failure60 */61static int iser_create_device_ib_res(struct iser_device *device)62{63 struct ib_device *ib_dev = device->ib_device;64 65 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)) {66 iser_err("IB device does not support memory registrations\n");67 return -1;68 }69 70 device->pd = ib_alloc_pd(ib_dev,71 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);72 if (IS_ERR(device->pd))73 goto pd_err;74 75 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev,76 iser_event_handler);77 ib_register_event_handler(&device->event_handler);78 return 0;79 80pd_err:81 iser_err("failed to allocate an IB resource\n");82 return -1;83}84 85/*86 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,87 * CQ and PD created with the device associated with the adaptor.88 */89static void iser_free_device_ib_res(struct iser_device *device)90{91 ib_unregister_event_handler(&device->event_handler);92 ib_dealloc_pd(device->pd);93 94 device->pd = NULL;95}96 97static struct iser_fr_desc *98iser_create_fastreg_desc(struct iser_device *device,99 struct ib_pd *pd,100 bool pi_enable,101 unsigned int size)102{103 struct iser_fr_desc *desc;104 struct ib_device *ib_dev = device->ib_device;105 enum ib_mr_type mr_type;106 int ret;107 108 desc = kzalloc(sizeof(*desc), GFP_KERNEL);109 if (!desc)110 return ERR_PTR(-ENOMEM);111 112 if (ib_dev->attrs.kernel_cap_flags & IBK_SG_GAPS_REG)113 mr_type = IB_MR_TYPE_SG_GAPS;114 else115 mr_type = IB_MR_TYPE_MEM_REG;116 117 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size);118 if (IS_ERR(desc->rsc.mr)) {119 ret = PTR_ERR(desc->rsc.mr);120 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);121 goto err_alloc_mr;122 }123 124 if (pi_enable) {125 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size);126 if (IS_ERR(desc->rsc.sig_mr)) {127 ret = PTR_ERR(desc->rsc.sig_mr);128 iser_err("Failed to allocate sig_mr err=%d\n", ret);129 goto err_alloc_mr_integrity;130 }131 }132 133 return desc;134 135err_alloc_mr_integrity:136 ib_dereg_mr(desc->rsc.mr);137err_alloc_mr:138 kfree(desc);139 140 return ERR_PTR(ret);141}142 143static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc)144{145 struct iser_reg_resources *res = &desc->rsc;146 147 ib_dereg_mr(res->mr);148 if (res->sig_mr) {149 ib_dereg_mr(res->sig_mr);150 res->sig_mr = NULL;151 }152 kfree(desc);153}154 155/**156 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors157 * for fast registration work requests.158 * @ib_conn: connection RDMA resources159 * @cmds_max: max number of SCSI commands for this connection160 * @size: max number of pages per map request161 *162 * Return: 0 on success, or errno code on failure163 */164int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,165 unsigned cmds_max,166 unsigned int size)167{168 struct iser_device *device = ib_conn->device;169 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;170 struct iser_fr_desc *desc;171 int i, ret;172 173 INIT_LIST_HEAD(&fr_pool->list);174 INIT_LIST_HEAD(&fr_pool->all_list);175 spin_lock_init(&fr_pool->lock);176 fr_pool->size = 0;177 for (i = 0; i < cmds_max; i++) {178 desc = iser_create_fastreg_desc(device, device->pd,179 ib_conn->pi_support, size);180 if (IS_ERR(desc)) {181 ret = PTR_ERR(desc);182 goto err;183 }184 185 list_add_tail(&desc->list, &fr_pool->list);186 list_add_tail(&desc->all_list, &fr_pool->all_list);187 fr_pool->size++;188 }189 190 return 0;191 192err:193 iser_free_fastreg_pool(ib_conn);194 return ret;195}196 197/**198 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors199 * @ib_conn: connection RDMA resources200 */201void iser_free_fastreg_pool(struct ib_conn *ib_conn)202{203 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;204 struct iser_fr_desc *desc, *tmp;205 int i = 0;206 207 if (list_empty(&fr_pool->all_list))208 return;209 210 iser_info("freeing conn %p fr pool\n", ib_conn);211 212 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {213 list_del(&desc->all_list);214 iser_destroy_fastreg_desc(desc);215 ++i;216 }217 218 if (i < fr_pool->size)219 iser_warn("pool still has %d regions registered\n",220 fr_pool->size - i);221}222 223/*224 * iser_create_ib_conn_res - Queue-Pair (QP)225 *226 * Return: 0 on success, -1 on failure227 */228static int iser_create_ib_conn_res(struct ib_conn *ib_conn)229{230 struct iser_conn *iser_conn = to_iser_conn(ib_conn);231 struct iser_device *device;232 struct ib_device *ib_dev;233 struct ib_qp_init_attr init_attr;234 int ret = -ENOMEM;235 unsigned int max_send_wr, cq_size;236 237 BUG_ON(ib_conn->device == NULL);238 239 device = ib_conn->device;240 ib_dev = device->ib_device;241 242 /* +1 for drain */243 if (ib_conn->pi_support)244 max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;245 else246 max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;247 max_send_wr = min_t(unsigned int, max_send_wr,248 (unsigned int)ib_dev->attrs.max_qp_wr);249 250 cq_size = max_send_wr + ISER_QP_MAX_RECV_DTOS;251 ib_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_SOFTIRQ);252 if (IS_ERR(ib_conn->cq)) {253 ret = PTR_ERR(ib_conn->cq);254 goto cq_err;255 }256 ib_conn->cq_size = cq_size;257 258 memset(&init_attr, 0, sizeof(init_attr));259 260 init_attr.event_handler = iser_qp_event_callback;261 init_attr.qp_context = (void *)ib_conn;262 init_attr.send_cq = ib_conn->cq;263 init_attr.recv_cq = ib_conn->cq;264 /* +1 for drain */265 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS + 1;266 init_attr.cap.max_send_sge = 2;267 init_attr.cap.max_recv_sge = 1;268 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;269 init_attr.qp_type = IB_QPT_RC;270 init_attr.cap.max_send_wr = max_send_wr;271 if (ib_conn->pi_support)272 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;273 iser_conn->max_cmds = ISER_GET_MAX_XMIT_CMDS(max_send_wr - 1);274 275 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);276 if (ret)277 goto out_err;278 279 ib_conn->qp = ib_conn->cma_id->qp;280 iser_info("setting conn %p cma_id %p qp %p max_send_wr %d\n", ib_conn,281 ib_conn->cma_id, ib_conn->cma_id->qp, max_send_wr);282 return ret;283 284out_err:285 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);286cq_err:287 iser_err("unable to alloc mem or create resource, err %d\n", ret);288 289 return ret;290}291 292/*293 * based on the resolved device node GUID see if there already allocated294 * device for this device. If there's no such, create one.295 */296static297struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)298{299 struct iser_device *device;300 301 mutex_lock(&ig.device_list_mutex);302 303 list_for_each_entry(device, &ig.device_list, ig_list)304 /* find if there's a match using the node GUID */305 if (device->ib_device->node_guid == cma_id->device->node_guid)306 goto inc_refcnt;307 308 device = kzalloc(sizeof *device, GFP_KERNEL);309 if (!device)310 goto out;311 312 /* assign this device to the device */313 device->ib_device = cma_id->device;314 /* init the device and link it into ig device list */315 if (iser_create_device_ib_res(device)) {316 kfree(device);317 device = NULL;318 goto out;319 }320 list_add(&device->ig_list, &ig.device_list);321 322inc_refcnt:323 device->refcount++;324out:325 mutex_unlock(&ig.device_list_mutex);326 return device;327}328 329/* if there's no demand for this device, release it */330static void iser_device_try_release(struct iser_device *device)331{332 mutex_lock(&ig.device_list_mutex);333 device->refcount--;334 iser_info("device %p refcount %d\n", device, device->refcount);335 if (!device->refcount) {336 iser_free_device_ib_res(device);337 list_del(&device->ig_list);338 kfree(device);339 }340 mutex_unlock(&ig.device_list_mutex);341}342 343void iser_release_work(struct work_struct *work)344{345 struct iser_conn *iser_conn;346 347 iser_conn = container_of(work, struct iser_conn, release_work);348 349 /* Wait for conn_stop to complete */350 wait_for_completion(&iser_conn->stop_completion);351 /* Wait for IB resouces cleanup to complete */352 wait_for_completion(&iser_conn->ib_completion);353 354 mutex_lock(&iser_conn->state_mutex);355 iser_conn->state = ISER_CONN_DOWN;356 mutex_unlock(&iser_conn->state_mutex);357 358 iser_conn_release(iser_conn);359}360 361/**362 * iser_free_ib_conn_res - release IB related resources363 * @iser_conn: iser connection struct364 * @destroy: indicator if we need to try to release the365 * iser device and memory regoins pool (only iscsi366 * shutdown and DEVICE_REMOVAL will use this).367 *368 * This routine is called with the iser state mutex held369 * so the cm_id removal is out of here. It is Safe to370 * be invoked multiple times.371 */372static void iser_free_ib_conn_res(struct iser_conn *iser_conn, bool destroy)373{374 struct ib_conn *ib_conn = &iser_conn->ib_conn;375 struct iser_device *device = ib_conn->device;376 377 iser_info("freeing conn %p cma_id %p qp %p\n",378 iser_conn, ib_conn->cma_id, ib_conn->qp);379 380 if (ib_conn->qp) {381 rdma_destroy_qp(ib_conn->cma_id);382 ib_cq_pool_put(ib_conn->cq, ib_conn->cq_size);383 ib_conn->qp = NULL;384 }385 386 if (destroy) {387 if (iser_conn->rx_descs)388 iser_free_rx_descriptors(iser_conn);389 390 if (device) {391 iser_device_try_release(device);392 ib_conn->device = NULL;393 }394 }395}396 397/**398 * iser_conn_release - Frees all conn objects and deallocs conn descriptor399 * @iser_conn: iSER connection context400 */401void iser_conn_release(struct iser_conn *iser_conn)402{403 struct ib_conn *ib_conn = &iser_conn->ib_conn;404 405 mutex_lock(&ig.connlist_mutex);406 list_del(&iser_conn->conn_list);407 mutex_unlock(&ig.connlist_mutex);408 409 mutex_lock(&iser_conn->state_mutex);410 /* In case we endup here without ep_disconnect being invoked. */411 if (iser_conn->state != ISER_CONN_DOWN) {412 iser_warn("iser conn %p state %d, expected state down.\n",413 iser_conn, iser_conn->state);414 iscsi_destroy_endpoint(iser_conn->ep);415 iser_conn->state = ISER_CONN_DOWN;416 }417 /*418 * In case we never got to bind stage, we still need to419 * release IB resources (which is safe to call more than once).420 */421 iser_free_ib_conn_res(iser_conn, true);422 mutex_unlock(&iser_conn->state_mutex);423 424 if (ib_conn->cma_id) {425 rdma_destroy_id(ib_conn->cma_id);426 ib_conn->cma_id = NULL;427 }428 429 kfree(iser_conn);430}431 432/**433 * iser_conn_terminate - triggers start of the disconnect procedures and434 * waits for them to be done435 * @iser_conn: iSER connection context436 *437 * Called with state mutex held438 */439int iser_conn_terminate(struct iser_conn *iser_conn)440{441 struct ib_conn *ib_conn = &iser_conn->ib_conn;442 int err = 0;443 444 lockdep_assert_held(&iser_conn->state_mutex);445 446 /* terminate the iser conn only if the conn state is UP */447 if (iser_conn->state != ISER_CONN_UP)448 return 0;449 450 iser_conn->state = ISER_CONN_TERMINATING;451 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);452 453 /* suspend queuing of new iscsi commands */454 if (iser_conn->iscsi_conn)455 iscsi_suspend_queue(iser_conn->iscsi_conn);456 457 /*458 * In case we didn't already clean up the cma_id (peer initiated459 * a disconnection), we need to Cause the CMA to change the QP460 * state to ERROR.461 */462 if (ib_conn->cma_id) {463 err = rdma_disconnect(ib_conn->cma_id);464 if (err)465 iser_err("Failed to disconnect, conn: 0x%p err %d\n",466 iser_conn, err);467 468 /* block until all flush errors are consumed */469 ib_drain_qp(ib_conn->qp);470 }471 472 return 1;473}474 475/*476 * Called with state mutex held477 */478static void iser_connect_error(struct rdma_cm_id *cma_id)479{480 struct iser_conn *iser_conn = cma_id->context;481 482 lockdep_assert_held(&iser_conn->state_mutex);483 484 iser_conn->state = ISER_CONN_TERMINATING;485}486 487static void iser_calc_scsi_params(struct iser_conn *iser_conn,488 unsigned int max_sectors)489{490 struct iser_device *device = iser_conn->ib_conn.device;491 struct ib_device_attr *attr = &device->ib_device->attrs;492 unsigned short sg_tablesize, sup_sg_tablesize;493 unsigned short reserved_mr_pages;494 u32 max_num_sg;495 496 /*497 * FRs without SG_GAPS can only map up to a (device) page per entry,498 * but if the first entry is misaligned we'll end up using two entries499 * (head and tail) for a single page worth data, so one additional500 * entry is required.501 */502 if (attr->kernel_cap_flags & IBK_SG_GAPS_REG)503 reserved_mr_pages = 0;504 else505 reserved_mr_pages = 1;506 507 if (iser_conn->ib_conn.pi_support)508 max_num_sg = attr->max_pi_fast_reg_page_list_len;509 else510 max_num_sg = attr->max_fast_reg_page_list_len;511 512 sg_tablesize = DIV_ROUND_UP(max_sectors * SECTOR_SIZE, SZ_4K);513 sup_sg_tablesize = min_t(uint, ISCSI_ISER_MAX_SG_TABLESIZE,514 max_num_sg - reserved_mr_pages);515 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize);516 iser_conn->pages_per_mr =517 iser_conn->scsi_sg_tablesize + reserved_mr_pages;518}519 520/*521 * Called with state mutex held522 */523static void iser_addr_handler(struct rdma_cm_id *cma_id)524{525 struct iser_conn *iser_conn = cma_id->context;526 struct iser_device *device;527 struct ib_conn *ib_conn;528 int ret;529 530 lockdep_assert_held(&iser_conn->state_mutex);531 532 if (iser_conn->state != ISER_CONN_PENDING)533 /* bailout */534 return;535 536 ib_conn = &iser_conn->ib_conn;537 device = iser_device_find_by_ib_device(cma_id);538 if (!device) {539 iser_err("device lookup/creation failed\n");540 iser_connect_error(cma_id);541 return;542 }543 544 ib_conn->device = device;545 546 /* connection T10-PI support */547 if (iser_pi_enable) {548 if (!(device->ib_device->attrs.kernel_cap_flags &549 IBK_INTEGRITY_HANDOVER)) {550 iser_warn("T10-PI requested but not supported on %s, "551 "continue without T10-PI\n",552 dev_name(&ib_conn->device->ib_device->dev));553 ib_conn->pi_support = false;554 } else {555 ib_conn->pi_support = true;556 }557 }558 559 iser_calc_scsi_params(iser_conn, iser_max_sectors);560 561 ret = rdma_resolve_route(cma_id, 1000);562 if (ret) {563 iser_err("resolve route failed: %d\n", ret);564 iser_connect_error(cma_id);565 return;566 }567}568 569/*570 * Called with state mutex held571 */572static void iser_route_handler(struct rdma_cm_id *cma_id)573{574 struct rdma_conn_param conn_param;575 int ret;576 struct iser_cm_hdr req_hdr;577 struct iser_conn *iser_conn = cma_id->context;578 struct ib_conn *ib_conn = &iser_conn->ib_conn;579 struct ib_device *ib_dev = ib_conn->device->ib_device;580 581 lockdep_assert_held(&iser_conn->state_mutex);582 583 if (iser_conn->state != ISER_CONN_PENDING)584 /* bailout */585 return;586 587 ret = iser_create_ib_conn_res(ib_conn);588 if (ret)589 goto failure;590 591 memset(&conn_param, 0, sizeof conn_param);592 conn_param.responder_resources = ib_dev->attrs.max_qp_rd_atom;593 conn_param.initiator_depth = 1;594 conn_param.retry_count = 7;595 conn_param.rnr_retry_count = 6;596 597 memset(&req_hdr, 0, sizeof(req_hdr));598 req_hdr.flags = ISER_ZBVA_NOT_SUP;599 if (!iser_always_reg)600 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP;601 conn_param.private_data = (void *)&req_hdr;602 conn_param.private_data_len = sizeof(struct iser_cm_hdr);603 604 ret = rdma_connect_locked(cma_id, &conn_param);605 if (ret) {606 iser_err("failure connecting: %d\n", ret);607 goto failure;608 }609 610 return;611failure:612 iser_connect_error(cma_id);613}614 615/*616 * Called with state mutex held617 */618static void iser_connected_handler(struct rdma_cm_id *cma_id,619 const void *private_data)620{621 struct iser_conn *iser_conn = cma_id->context;622 struct ib_qp_attr attr;623 struct ib_qp_init_attr init_attr;624 625 lockdep_assert_held(&iser_conn->state_mutex);626 627 if (iser_conn->state != ISER_CONN_PENDING)628 /* bailout */629 return;630 631 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);632 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);633 634 if (private_data) {635 u8 flags = *(u8 *)private_data;636 637 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP);638 }639 640 iser_info("conn %p: negotiated %s invalidation\n",641 iser_conn, iser_conn->snd_w_inv ? "remote" : "local");642 643 iser_conn->state = ISER_CONN_UP;644 complete(&iser_conn->up_completion);645}646 647/*648 * Called with state mutex held649 */650static void iser_cleanup_handler(struct rdma_cm_id *cma_id,651 bool destroy)652{653 struct iser_conn *iser_conn = cma_id->context;654 655 lockdep_assert_held(&iser_conn->state_mutex);656 /*657 * We are not guaranteed that we visited disconnected_handler658 * by now, call it here to be safe that we handle CM drep659 * and flush errors.660 */661 if (iser_conn_terminate(iser_conn)) {662 if (iser_conn->iscsi_conn)663 iscsi_conn_failure(iser_conn->iscsi_conn,664 ISCSI_ERR_CONN_FAILED);665 else666 iser_err("iscsi_iser connection isn't bound\n");667 }668 iser_free_ib_conn_res(iser_conn, destroy);669 complete(&iser_conn->ib_completion);670}671 672static int iser_cma_handler(struct rdma_cm_id *cma_id,673 struct rdma_cm_event *event)674{675 struct iser_conn *iser_conn;676 int ret = 0;677 678 iser_conn = cma_id->context;679 iser_info("%s (%d): status %d conn %p id %p\n",680 rdma_event_msg(event->event), event->event,681 event->status, cma_id->context, cma_id);682 683 mutex_lock(&iser_conn->state_mutex);684 switch (event->event) {685 case RDMA_CM_EVENT_ADDR_RESOLVED:686 iser_addr_handler(cma_id);687 break;688 case RDMA_CM_EVENT_ROUTE_RESOLVED:689 iser_route_handler(cma_id);690 break;691 case RDMA_CM_EVENT_ESTABLISHED:692 iser_connected_handler(cma_id, event->param.conn.private_data);693 break;694 case RDMA_CM_EVENT_REJECTED:695 iser_info("Connection rejected: %s\n",696 rdma_reject_msg(cma_id, event->status));697 fallthrough;698 case RDMA_CM_EVENT_ADDR_ERROR:699 case RDMA_CM_EVENT_ROUTE_ERROR:700 case RDMA_CM_EVENT_CONNECT_ERROR:701 case RDMA_CM_EVENT_UNREACHABLE:702 iser_connect_error(cma_id);703 break;704 case RDMA_CM_EVENT_DISCONNECTED:705 case RDMA_CM_EVENT_ADDR_CHANGE:706 case RDMA_CM_EVENT_TIMEWAIT_EXIT:707 iser_cleanup_handler(cma_id, false);708 break;709 case RDMA_CM_EVENT_DEVICE_REMOVAL:710 /*711 * we *must* destroy the device as we cannot rely712 * on iscsid to be around to initiate error handling.713 * also if we are not in state DOWN implicitly destroy714 * the cma_id.715 */716 iser_cleanup_handler(cma_id, true);717 if (iser_conn->state != ISER_CONN_DOWN) {718 iser_conn->ib_conn.cma_id = NULL;719 ret = 1;720 }721 break;722 default:723 iser_err("Unexpected RDMA CM event: %s (%d)\n",724 rdma_event_msg(event->event), event->event);725 break;726 }727 mutex_unlock(&iser_conn->state_mutex);728 729 return ret;730}731 732void iser_conn_init(struct iser_conn *iser_conn)733{734 struct ib_conn *ib_conn = &iser_conn->ib_conn;735 736 iser_conn->state = ISER_CONN_INIT;737 init_completion(&iser_conn->stop_completion);738 init_completion(&iser_conn->ib_completion);739 init_completion(&iser_conn->up_completion);740 INIT_LIST_HEAD(&iser_conn->conn_list);741 mutex_init(&iser_conn->state_mutex);742 743 ib_conn->reg_cqe.done = iser_reg_comp;744}745 746/*747 * starts the process of connecting to the target748 * sleeps until the connection is established or rejected749 */750int iser_connect(struct iser_conn *iser_conn, struct sockaddr *src_addr,751 struct sockaddr *dst_addr, int non_blocking)752{753 struct ib_conn *ib_conn = &iser_conn->ib_conn;754 int err = 0;755 756 mutex_lock(&iser_conn->state_mutex);757 758 sprintf(iser_conn->name, "%pISp", dst_addr);759 760 iser_info("connecting to: %s\n", iser_conn->name);761 762 /* the device is known only --after-- address resolution */763 ib_conn->device = NULL;764 765 iser_conn->state = ISER_CONN_PENDING;766 767 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler,768 iser_conn, RDMA_PS_TCP, IB_QPT_RC);769 if (IS_ERR(ib_conn->cma_id)) {770 err = PTR_ERR(ib_conn->cma_id);771 iser_err("rdma_create_id failed: %d\n", err);772 goto id_failure;773 }774 775 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);776 if (err) {777 iser_err("rdma_resolve_addr failed: %d\n", err);778 goto addr_failure;779 }780 781 if (!non_blocking) {782 wait_for_completion_interruptible(&iser_conn->up_completion);783 784 if (iser_conn->state != ISER_CONN_UP) {785 err = -EIO;786 goto connect_failure;787 }788 }789 mutex_unlock(&iser_conn->state_mutex);790 791 mutex_lock(&ig.connlist_mutex);792 list_add(&iser_conn->conn_list, &ig.connlist);793 mutex_unlock(&ig.connlist_mutex);794 return 0;795 796id_failure:797 ib_conn->cma_id = NULL;798addr_failure:799 iser_conn->state = ISER_CONN_DOWN;800connect_failure:801 mutex_unlock(&iser_conn->state_mutex);802 iser_conn_release(iser_conn);803 return err;804}805 806int iser_post_recvl(struct iser_conn *iser_conn)807{808 struct ib_conn *ib_conn = &iser_conn->ib_conn;809 struct iser_login_desc *desc = &iser_conn->login_desc;810 struct ib_recv_wr wr;811 int ret;812 813 desc->sge.addr = desc->rsp_dma;814 desc->sge.length = ISER_RX_LOGIN_SIZE;815 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey;816 817 desc->cqe.done = iser_login_rsp;818 wr.wr_cqe = &desc->cqe;819 wr.sg_list = &desc->sge;820 wr.num_sge = 1;821 wr.next = NULL;822 823 ret = ib_post_recv(ib_conn->qp, &wr, NULL);824 if (unlikely(ret))825 iser_err("ib_post_recv login failed ret=%d\n", ret);826 827 return ret;828}829 830int iser_post_recvm(struct iser_conn *iser_conn, struct iser_rx_desc *rx_desc)831{832 struct ib_conn *ib_conn = &iser_conn->ib_conn;833 struct ib_recv_wr wr;834 int ret;835 836 rx_desc->cqe.done = iser_task_rsp;837 wr.wr_cqe = &rx_desc->cqe;838 wr.sg_list = &rx_desc->rx_sg;839 wr.num_sge = 1;840 wr.next = NULL;841 842 ret = ib_post_recv(ib_conn->qp, &wr, NULL);843 if (unlikely(ret))844 iser_err("ib_post_recv failed ret=%d\n", ret);845 846 return ret;847}848 849 850/**851 * iser_post_send - Initiate a Send DTO operation852 * @ib_conn: connection RDMA resources853 * @tx_desc: iSER TX descriptor854 *855 * Return: 0 on success, -1 on failure856 */857int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc)858{859 struct ib_send_wr *wr = &tx_desc->send_wr;860 struct ib_send_wr *first_wr;861 int ret;862 863 ib_dma_sync_single_for_device(ib_conn->device->ib_device,864 tx_desc->dma_addr, ISER_HEADERS_LEN,865 DMA_TO_DEVICE);866 867 wr->next = NULL;868 wr->wr_cqe = &tx_desc->cqe;869 wr->sg_list = tx_desc->tx_sg;870 wr->num_sge = tx_desc->num_sge;871 wr->opcode = IB_WR_SEND;872 wr->send_flags = IB_SEND_SIGNALED;873 874 if (tx_desc->inv_wr.next)875 first_wr = &tx_desc->inv_wr;876 else if (tx_desc->reg_wr.wr.next)877 first_wr = &tx_desc->reg_wr.wr;878 else879 first_wr = wr;880 881 ret = ib_post_send(ib_conn->qp, first_wr, NULL);882 if (unlikely(ret))883 iser_err("ib_post_send failed, ret:%d opcode:%d\n",884 ret, wr->opcode);885 886 return ret;887}888 889u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,890 enum iser_data_dir cmd_dir, sector_t *sector)891{892 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];893 struct iser_fr_desc *desc = reg->desc;894 unsigned long sector_size = iser_task->sc->device->sector_size;895 struct ib_mr_status mr_status;896 int ret;897 898 if (desc && desc->sig_protected) {899 desc->sig_protected = false;900 ret = ib_check_mr_status(desc->rsc.sig_mr,901 IB_MR_CHECK_SIG_STATUS, &mr_status);902 if (ret) {903 iser_err("ib_check_mr_status failed, ret %d\n", ret);904 /* Not a lot we can do, return ambiguous guard error */905 *sector = 0;906 return 0x1;907 }908 909 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {910 sector_t sector_off = mr_status.sig_err.sig_err_offset;911 912 sector_div(sector_off, sector_size + 8);913 *sector = scsi_get_sector(iser_task->sc) + sector_off;914 915 iser_err("PI error found type %d at sector %llx "916 "expected %x vs actual %x\n",917 mr_status.sig_err.err_type,918 (unsigned long long)*sector,919 mr_status.sig_err.expected,920 mr_status.sig_err.actual);921 922 switch (mr_status.sig_err.err_type) {923 case IB_SIG_BAD_GUARD:924 return 0x1;925 case IB_SIG_BAD_REFTAG:926 return 0x3;927 case IB_SIG_BAD_APPTAG:928 return 0x2;929 }930 }931 }932 933 return 0;934}935 936void iser_err_comp(struct ib_wc *wc, const char *type)937{938 if (wc->status != IB_WC_WR_FLUSH_ERR) {939 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context);940 941 iser_err("%s failure: %s (%d) vend_err %#x\n", type,942 ib_wc_status_msg(wc->status), wc->status,943 wc->vendor_err);944 945 if (iser_conn->iscsi_conn)946 iscsi_conn_failure(iser_conn->iscsi_conn,947 ISCSI_ERR_CONN_FAILED);948 } else {949 iser_dbg("%s failure: %s (%d)\n", type,950 ib_wc_status_msg(wc->status), wc->status);951 }952}953