1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * This file contains iSCSI extentions for RDMA (iSER) Verbs 4 * 5 * (c) Copyright 2013 Datera, Inc. 6 * 7 * Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ****************************************************************************/ 10 11 #include <linux/string.h> 12 #include <linux/module.h> 13 #include <linux/scatterlist.h> 14 #include <linux/socket.h> 15 #include <linux/in.h> 16 #include <linux/in6.h> 17 #include <rdma/ib_verbs.h> 18 #include <rdma/rdma_cm.h> 19 #include <target/target_core_base.h> 20 #include <target/target_core_fabric.h> 21 #include <target/iscsi/iscsi_transport.h> 22 #include <linux/semaphore.h> 23 24 #include "ib_isert.h" 25 26 #define ISERT_MAX_CONN 8 27 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) 28 #define ISER_MAX_TX_CQ_LEN \ 29 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN) 30 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \ 31 ISERT_MAX_CONN) 32 33 static int isert_debug_level; 34 module_param_named(debug_level, isert_debug_level, int, 0644); 35 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)"); 36 37 static DEFINE_MUTEX(device_list_mutex); 38 static LIST_HEAD(device_list); 39 static struct workqueue_struct *isert_comp_wq; 40 static struct workqueue_struct *isert_release_wq; 41 42 static int 43 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); 44 static int 45 isert_login_post_recv(struct isert_conn *isert_conn); 46 static int 47 isert_rdma_accept(struct isert_conn *isert_conn); 48 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); 49 50 static void isert_release_work(struct work_struct *work); 51 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc); 52 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc); 53 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc); 54 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc); 55 56 static inline bool 57 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) 58 { 59 return (conn->pi_support && 60 cmd->prot_op != TARGET_PROT_NORMAL); 61 } 62 63 64 static void 65 isert_qp_event_callback(struct ib_event *e, void *context) 66 { 67 struct isert_conn *isert_conn = context; 68 69 isert_err("%s (%d): conn %p\n", 70 ib_event_msg(e->event), e->event, isert_conn); 71 72 switch (e->event) { 73 case IB_EVENT_COMM_EST: 74 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); 75 break; 76 case IB_EVENT_QP_LAST_WQE_REACHED: 77 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); 78 break; 79 default: 80 break; 81 } 82 } 83 84 static struct isert_comp * 85 isert_comp_get(struct isert_conn *isert_conn) 86 { 87 struct isert_device *device = isert_conn->device; 88 struct isert_comp *comp; 89 int i, min = 0; 90 91 mutex_lock(&device_list_mutex); 92 for (i = 0; i < device->comps_used; i++) 93 if (device->comps[i].active_qps < 94 device->comps[min].active_qps) 95 min = i; 96 comp = &device->comps[min]; 97 comp->active_qps++; 98 mutex_unlock(&device_list_mutex); 99 100 isert_info("conn %p, using comp %p min_index: %d\n", 101 isert_conn, comp, min); 102 103 return comp; 104 } 105 106 static void 107 isert_comp_put(struct isert_comp *comp) 108 { 109 mutex_lock(&device_list_mutex); 110 comp->active_qps--; 111 mutex_unlock(&device_list_mutex); 112 } 113 114 static struct ib_qp * 115 isert_create_qp(struct isert_conn *isert_conn, 116 struct isert_comp *comp, 117 struct rdma_cm_id *cma_id) 118 { 119 struct isert_device *device = isert_conn->device; 120 struct ib_qp_init_attr attr; 121 int ret; 122 123 memset(&attr, 0, sizeof(struct ib_qp_init_attr)); 124 attr.event_handler = isert_qp_event_callback; 125 attr.qp_context = isert_conn; 126 attr.send_cq = comp->cq; 127 attr.recv_cq = comp->cq; 128 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1; 129 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; 130 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX; 131 attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge; 132 attr.cap.max_recv_sge = 1; 133 attr.sq_sig_type = IB_SIGNAL_REQ_WR; 134 attr.qp_type = IB_QPT_RC; 135 if (device->pi_capable) 136 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; 137 138 ret = rdma_create_qp(cma_id, device->pd, &attr); 139 if (ret) { 140 isert_err("rdma_create_qp failed for cma_id %d\n", ret); 141 return ERR_PTR(ret); 142 } 143 144 return cma_id->qp; 145 } 146 147 static int 148 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) 149 { 150 struct isert_comp *comp; 151 int ret; 152 153 comp = isert_comp_get(isert_conn); 154 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id); 155 if (IS_ERR(isert_conn->qp)) { 156 ret = PTR_ERR(isert_conn->qp); 157 goto err; 158 } 159 160 return 0; 161 err: 162 isert_comp_put(comp); 163 return ret; 164 } 165 166 static int 167 isert_alloc_rx_descriptors(struct isert_conn *isert_conn) 168 { 169 struct isert_device *device = isert_conn->device; 170 struct ib_device *ib_dev = device->ib_device; 171 struct iser_rx_desc *rx_desc; 172 struct ib_sge *rx_sg; 173 u64 dma_addr; 174 int i, j; 175 176 isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS, 177 sizeof(struct iser_rx_desc), 178 GFP_KERNEL); 179 if (!isert_conn->rx_descs) 180 return -ENOMEM; 181 182 rx_desc = isert_conn->rx_descs; 183 184 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 185 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc, 186 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 187 if (ib_dma_mapping_error(ib_dev, dma_addr)) 188 goto dma_map_fail; 189 190 rx_desc->dma_addr = dma_addr; 191 192 rx_sg = &rx_desc->rx_sg; 193 rx_sg->addr = rx_desc->dma_addr; 194 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 195 rx_sg->lkey = device->pd->local_dma_lkey; 196 rx_desc->rx_cqe.done = isert_recv_done; 197 } 198 199 return 0; 200 201 dma_map_fail: 202 rx_desc = isert_conn->rx_descs; 203 for (j = 0; j < i; j++, rx_desc++) { 204 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 205 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 206 } 207 kfree(isert_conn->rx_descs); 208 isert_conn->rx_descs = NULL; 209 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); 210 return -ENOMEM; 211 } 212 213 static void 214 isert_free_rx_descriptors(struct isert_conn *isert_conn) 215 { 216 struct ib_device *ib_dev = isert_conn->device->ib_device; 217 struct iser_rx_desc *rx_desc; 218 int i; 219 220 if (!isert_conn->rx_descs) 221 return; 222 223 rx_desc = isert_conn->rx_descs; 224 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 225 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 226 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 227 } 228 229 kfree(isert_conn->rx_descs); 230 isert_conn->rx_descs = NULL; 231 } 232 233 static void 234 isert_free_comps(struct isert_device *device) 235 { 236 int i; 237 238 for (i = 0; i < device->comps_used; i++) { 239 struct isert_comp *comp = &device->comps[i]; 240 241 if (comp->cq) 242 ib_free_cq(comp->cq); 243 } 244 kfree(device->comps); 245 } 246 247 static int 248 isert_alloc_comps(struct isert_device *device) 249 { 250 int i, max_cqe, ret = 0; 251 252 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(), 253 device->ib_device->num_comp_vectors)); 254 255 isert_info("Using %d CQs, %s supports %d vectors support " 256 "pi_capable %d\n", 257 device->comps_used, dev_name(&device->ib_device->dev), 258 device->ib_device->num_comp_vectors, 259 device->pi_capable); 260 261 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), 262 GFP_KERNEL); 263 if (!device->comps) 264 return -ENOMEM; 265 266 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe); 267 268 for (i = 0; i < device->comps_used; i++) { 269 struct isert_comp *comp = &device->comps[i]; 270 271 comp->device = device; 272 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i, 273 IB_POLL_WORKQUEUE); 274 if (IS_ERR(comp->cq)) { 275 isert_err("Unable to allocate cq\n"); 276 ret = PTR_ERR(comp->cq); 277 comp->cq = NULL; 278 goto out_cq; 279 } 280 } 281 282 return 0; 283 out_cq: 284 isert_free_comps(device); 285 return ret; 286 } 287 288 static int 289 isert_create_device_ib_res(struct isert_device *device) 290 { 291 struct ib_device *ib_dev = device->ib_device; 292 int ret; 293 294 isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n", 295 ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge); 296 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd); 297 298 ret = isert_alloc_comps(device); 299 if (ret) 300 goto out; 301 302 device->pd = ib_alloc_pd(ib_dev, 0); 303 if (IS_ERR(device->pd)) { 304 ret = PTR_ERR(device->pd); 305 isert_err("failed to allocate pd, device %p, ret=%d\n", 306 device, ret); 307 goto out_cq; 308 } 309 310 /* Check signature cap */ 311 device->pi_capable = ib_dev->attrs.device_cap_flags & 312 IB_DEVICE_SIGNATURE_HANDOVER ? true : false; 313 314 return 0; 315 316 out_cq: 317 isert_free_comps(device); 318 out: 319 if (ret > 0) 320 ret = -EINVAL; 321 return ret; 322 } 323 324 static void 325 isert_free_device_ib_res(struct isert_device *device) 326 { 327 isert_info("device %p\n", device); 328 329 ib_dealloc_pd(device->pd); 330 isert_free_comps(device); 331 } 332 333 static void 334 isert_device_put(struct isert_device *device) 335 { 336 mutex_lock(&device_list_mutex); 337 device->refcount--; 338 isert_info("device %p refcount %d\n", device, device->refcount); 339 if (!device->refcount) { 340 isert_free_device_ib_res(device); 341 list_del(&device->dev_node); 342 kfree(device); 343 } 344 mutex_unlock(&device_list_mutex); 345 } 346 347 static struct isert_device * 348 isert_device_get(struct rdma_cm_id *cma_id) 349 { 350 struct isert_device *device; 351 int ret; 352 353 mutex_lock(&device_list_mutex); 354 list_for_each_entry(device, &device_list, dev_node) { 355 if (device->ib_device->node_guid == cma_id->device->node_guid) { 356 device->refcount++; 357 isert_info("Found iser device %p refcount %d\n", 358 device, device->refcount); 359 mutex_unlock(&device_list_mutex); 360 return device; 361 } 362 } 363 364 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); 365 if (!device) { 366 mutex_unlock(&device_list_mutex); 367 return ERR_PTR(-ENOMEM); 368 } 369 370 INIT_LIST_HEAD(&device->dev_node); 371 372 device->ib_device = cma_id->device; 373 ret = isert_create_device_ib_res(device); 374 if (ret) { 375 kfree(device); 376 mutex_unlock(&device_list_mutex); 377 return ERR_PTR(ret); 378 } 379 380 device->refcount++; 381 list_add_tail(&device->dev_node, &device_list); 382 isert_info("Created a new iser device %p refcount %d\n", 383 device, device->refcount); 384 mutex_unlock(&device_list_mutex); 385 386 return device; 387 } 388 389 static void 390 isert_init_conn(struct isert_conn *isert_conn) 391 { 392 isert_conn->state = ISER_CONN_INIT; 393 INIT_LIST_HEAD(&isert_conn->node); 394 init_completion(&isert_conn->login_comp); 395 init_completion(&isert_conn->login_req_comp); 396 init_waitqueue_head(&isert_conn->rem_wait); 397 kref_init(&isert_conn->kref); 398 mutex_init(&isert_conn->mutex); 399 INIT_WORK(&isert_conn->release_work, isert_release_work); 400 } 401 402 static void 403 isert_free_login_buf(struct isert_conn *isert_conn) 404 { 405 struct ib_device *ib_dev = isert_conn->device->ib_device; 406 407 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, 408 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); 409 kfree(isert_conn->login_rsp_buf); 410 411 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 412 ISER_RX_PAYLOAD_SIZE, 413 DMA_FROM_DEVICE); 414 kfree(isert_conn->login_req_buf); 415 } 416 417 static int 418 isert_alloc_login_buf(struct isert_conn *isert_conn, 419 struct ib_device *ib_dev) 420 { 421 int ret; 422 423 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf), 424 GFP_KERNEL); 425 if (!isert_conn->login_req_buf) 426 return -ENOMEM; 427 428 isert_conn->login_req_dma = ib_dma_map_single(ib_dev, 429 isert_conn->login_req_buf, 430 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 431 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); 432 if (ret) { 433 isert_err("login_req_dma mapping error: %d\n", ret); 434 isert_conn->login_req_dma = 0; 435 goto out_free_login_req_buf; 436 } 437 438 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL); 439 if (!isert_conn->login_rsp_buf) { 440 ret = -ENOMEM; 441 goto out_unmap_login_req_buf; 442 } 443 444 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, 445 isert_conn->login_rsp_buf, 446 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); 447 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); 448 if (ret) { 449 isert_err("login_rsp_dma mapping error: %d\n", ret); 450 isert_conn->login_rsp_dma = 0; 451 goto out_free_login_rsp_buf; 452 } 453 454 return 0; 455 456 out_free_login_rsp_buf: 457 kfree(isert_conn->login_rsp_buf); 458 out_unmap_login_req_buf: 459 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 460 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 461 out_free_login_req_buf: 462 kfree(isert_conn->login_req_buf); 463 return ret; 464 } 465 466 static void 467 isert_set_nego_params(struct isert_conn *isert_conn, 468 struct rdma_conn_param *param) 469 { 470 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs; 471 472 /* Set max inflight RDMA READ requests */ 473 isert_conn->initiator_depth = min_t(u8, param->initiator_depth, 474 attr->max_qp_init_rd_atom); 475 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); 476 477 if (param->private_data) { 478 u8 flags = *(u8 *)param->private_data; 479 480 /* 481 * use remote invalidation if the both initiator 482 * and the HCA support it 483 */ 484 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) && 485 (attr->device_cap_flags & 486 IB_DEVICE_MEM_MGT_EXTENSIONS); 487 if (isert_conn->snd_w_inv) 488 isert_info("Using remote invalidation\n"); 489 } 490 } 491 492 static int 493 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 494 { 495 struct isert_np *isert_np = cma_id->context; 496 struct iscsi_np *np = isert_np->np; 497 struct isert_conn *isert_conn; 498 struct isert_device *device; 499 int ret = 0; 500 501 spin_lock_bh(&np->np_thread_lock); 502 if (!np->enabled) { 503 spin_unlock_bh(&np->np_thread_lock); 504 isert_dbg("iscsi_np is not enabled, reject connect request\n"); 505 return rdma_reject(cma_id, NULL, 0); 506 } 507 spin_unlock_bh(&np->np_thread_lock); 508 509 isert_dbg("cma_id: %p, portal: %p\n", 510 cma_id, cma_id->context); 511 512 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); 513 if (!isert_conn) 514 return -ENOMEM; 515 516 isert_init_conn(isert_conn); 517 isert_conn->cm_id = cma_id; 518 519 ret = isert_alloc_login_buf(isert_conn, cma_id->device); 520 if (ret) 521 goto out; 522 523 device = isert_device_get(cma_id); 524 if (IS_ERR(device)) { 525 ret = PTR_ERR(device); 526 goto out_rsp_dma_map; 527 } 528 isert_conn->device = device; 529 530 isert_set_nego_params(isert_conn, &event->param.conn); 531 532 ret = isert_conn_setup_qp(isert_conn, cma_id); 533 if (ret) 534 goto out_conn_dev; 535 536 ret = isert_login_post_recv(isert_conn); 537 if (ret) 538 goto out_conn_dev; 539 540 ret = isert_rdma_accept(isert_conn); 541 if (ret) 542 goto out_conn_dev; 543 544 mutex_lock(&isert_np->mutex); 545 list_add_tail(&isert_conn->node, &isert_np->accepted); 546 mutex_unlock(&isert_np->mutex); 547 548 return 0; 549 550 out_conn_dev: 551 isert_device_put(device); 552 out_rsp_dma_map: 553 isert_free_login_buf(isert_conn); 554 out: 555 kfree(isert_conn); 556 rdma_reject(cma_id, NULL, 0); 557 return ret; 558 } 559 560 static void 561 isert_connect_release(struct isert_conn *isert_conn) 562 { 563 struct isert_device *device = isert_conn->device; 564 565 isert_dbg("conn %p\n", isert_conn); 566 567 BUG_ON(!device); 568 569 isert_free_rx_descriptors(isert_conn); 570 if (isert_conn->cm_id && 571 !isert_conn->dev_removed) 572 rdma_destroy_id(isert_conn->cm_id); 573 574 if (isert_conn->qp) { 575 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; 576 577 isert_comp_put(comp); 578 ib_destroy_qp(isert_conn->qp); 579 } 580 581 if (isert_conn->login_req_buf) 582 isert_free_login_buf(isert_conn); 583 584 isert_device_put(device); 585 586 if (isert_conn->dev_removed) 587 wake_up_interruptible(&isert_conn->rem_wait); 588 else 589 kfree(isert_conn); 590 } 591 592 static void 593 isert_connected_handler(struct rdma_cm_id *cma_id) 594 { 595 struct isert_conn *isert_conn = cma_id->qp->qp_context; 596 struct isert_np *isert_np = cma_id->context; 597 598 isert_info("conn %p\n", isert_conn); 599 600 mutex_lock(&isert_conn->mutex); 601 isert_conn->state = ISER_CONN_UP; 602 kref_get(&isert_conn->kref); 603 mutex_unlock(&isert_conn->mutex); 604 605 mutex_lock(&isert_np->mutex); 606 list_move_tail(&isert_conn->node, &isert_np->pending); 607 mutex_unlock(&isert_np->mutex); 608 609 isert_info("np %p: Allow accept_np to continue\n", isert_np); 610 up(&isert_np->sem); 611 } 612 613 static void 614 isert_release_kref(struct kref *kref) 615 { 616 struct isert_conn *isert_conn = container_of(kref, 617 struct isert_conn, kref); 618 619 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, 620 current->pid); 621 622 isert_connect_release(isert_conn); 623 } 624 625 static void 626 isert_put_conn(struct isert_conn *isert_conn) 627 { 628 kref_put(&isert_conn->kref, isert_release_kref); 629 } 630 631 static void 632 isert_handle_unbound_conn(struct isert_conn *isert_conn) 633 { 634 struct isert_np *isert_np = isert_conn->cm_id->context; 635 636 mutex_lock(&isert_np->mutex); 637 if (!list_empty(&isert_conn->node)) { 638 /* 639 * This means iscsi doesn't know this connection 640 * so schedule a cleanup ourselves 641 */ 642 list_del_init(&isert_conn->node); 643 isert_put_conn(isert_conn); 644 queue_work(isert_release_wq, &isert_conn->release_work); 645 } 646 mutex_unlock(&isert_np->mutex); 647 } 648 649 /** 650 * isert_conn_terminate() - Initiate connection termination 651 * @isert_conn: isert connection struct 652 * 653 * Notes: 654 * In case the connection state is BOUND, move state 655 * to TEMINATING and start teardown sequence (rdma_disconnect). 656 * In case the connection state is UP, complete flush as well. 657 * 658 * This routine must be called with mutex held. Thus it is 659 * safe to call multiple times. 660 */ 661 static void 662 isert_conn_terminate(struct isert_conn *isert_conn) 663 { 664 int err; 665 666 if (isert_conn->state >= ISER_CONN_TERMINATING) 667 return; 668 669 isert_info("Terminating conn %p state %d\n", 670 isert_conn, isert_conn->state); 671 isert_conn->state = ISER_CONN_TERMINATING; 672 err = rdma_disconnect(isert_conn->cm_id); 673 if (err) 674 isert_warn("Failed rdma_disconnect isert_conn %p\n", 675 isert_conn); 676 } 677 678 static int 679 isert_np_cma_handler(struct isert_np *isert_np, 680 enum rdma_cm_event_type event) 681 { 682 isert_dbg("%s (%d): isert np %p\n", 683 rdma_event_msg(event), event, isert_np); 684 685 switch (event) { 686 case RDMA_CM_EVENT_DEVICE_REMOVAL: 687 isert_np->cm_id = NULL; 688 break; 689 case RDMA_CM_EVENT_ADDR_CHANGE: 690 isert_np->cm_id = isert_setup_id(isert_np); 691 if (IS_ERR(isert_np->cm_id)) { 692 isert_err("isert np %p setup id failed: %ld\n", 693 isert_np, PTR_ERR(isert_np->cm_id)); 694 isert_np->cm_id = NULL; 695 } 696 break; 697 default: 698 isert_err("isert np %p Unexpected event %d\n", 699 isert_np, event); 700 } 701 702 return -1; 703 } 704 705 static int 706 isert_disconnected_handler(struct rdma_cm_id *cma_id, 707 enum rdma_cm_event_type event) 708 { 709 struct isert_conn *isert_conn = cma_id->qp->qp_context; 710 711 mutex_lock(&isert_conn->mutex); 712 switch (isert_conn->state) { 713 case ISER_CONN_TERMINATING: 714 break; 715 case ISER_CONN_UP: 716 isert_conn_terminate(isert_conn); 717 ib_drain_qp(isert_conn->qp); 718 isert_handle_unbound_conn(isert_conn); 719 break; 720 case ISER_CONN_BOUND: 721 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ 722 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 723 break; 724 default: 725 isert_warn("conn %p terminating in state %d\n", 726 isert_conn, isert_conn->state); 727 } 728 mutex_unlock(&isert_conn->mutex); 729 730 return 0; 731 } 732 733 static int 734 isert_connect_error(struct rdma_cm_id *cma_id) 735 { 736 struct isert_conn *isert_conn = cma_id->qp->qp_context; 737 738 ib_drain_qp(isert_conn->qp); 739 list_del_init(&isert_conn->node); 740 isert_conn->cm_id = NULL; 741 isert_put_conn(isert_conn); 742 743 return -1; 744 } 745 746 static int 747 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 748 { 749 struct isert_np *isert_np = cma_id->context; 750 struct isert_conn *isert_conn; 751 int ret = 0; 752 753 isert_info("%s (%d): status %d id %p np %p\n", 754 rdma_event_msg(event->event), event->event, 755 event->status, cma_id, cma_id->context); 756 757 if (isert_np->cm_id == cma_id) 758 return isert_np_cma_handler(cma_id->context, event->event); 759 760 switch (event->event) { 761 case RDMA_CM_EVENT_CONNECT_REQUEST: 762 ret = isert_connect_request(cma_id, event); 763 if (ret) 764 isert_err("failed handle connect request %d\n", ret); 765 break; 766 case RDMA_CM_EVENT_ESTABLISHED: 767 isert_connected_handler(cma_id); 768 break; 769 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ 770 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ 771 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ 772 ret = isert_disconnected_handler(cma_id, event->event); 773 break; 774 case RDMA_CM_EVENT_DEVICE_REMOVAL: 775 isert_conn = cma_id->qp->qp_context; 776 isert_conn->dev_removed = true; 777 isert_disconnected_handler(cma_id, event->event); 778 wait_event_interruptible(isert_conn->rem_wait, 779 isert_conn->state == ISER_CONN_DOWN); 780 kfree(isert_conn); 781 /* 782 * return non-zero from the callback to destroy 783 * the rdma cm id 784 */ 785 return 1; 786 case RDMA_CM_EVENT_REJECTED: 787 isert_info("Connection rejected: %s\n", 788 rdma_reject_msg(cma_id, event->status)); 789 /* fall through */ 790 case RDMA_CM_EVENT_UNREACHABLE: 791 case RDMA_CM_EVENT_CONNECT_ERROR: 792 ret = isert_connect_error(cma_id); 793 break; 794 default: 795 isert_err("Unhandled RDMA CMA event: %d\n", event->event); 796 break; 797 } 798 799 return ret; 800 } 801 802 static int 803 isert_post_recvm(struct isert_conn *isert_conn, u32 count) 804 { 805 struct ib_recv_wr *rx_wr; 806 int i, ret; 807 struct iser_rx_desc *rx_desc; 808 809 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 810 rx_desc = &isert_conn->rx_descs[i]; 811 812 rx_wr->wr_cqe = &rx_desc->rx_cqe; 813 rx_wr->sg_list = &rx_desc->rx_sg; 814 rx_wr->num_sge = 1; 815 rx_wr->next = rx_wr + 1; 816 rx_desc->in_use = false; 817 } 818 rx_wr--; 819 rx_wr->next = NULL; /* mark end of work requests list */ 820 821 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL); 822 if (ret) 823 isert_err("ib_post_recv() failed with ret: %d\n", ret); 824 825 return ret; 826 } 827 828 static int 829 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc) 830 { 831 struct ib_recv_wr rx_wr; 832 int ret; 833 834 if (!rx_desc->in_use) { 835 /* 836 * if the descriptor is not in-use we already reposted it 837 * for recv, so just silently return 838 */ 839 return 0; 840 } 841 842 rx_desc->in_use = false; 843 rx_wr.wr_cqe = &rx_desc->rx_cqe; 844 rx_wr.sg_list = &rx_desc->rx_sg; 845 rx_wr.num_sge = 1; 846 rx_wr.next = NULL; 847 848 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); 849 if (ret) 850 isert_err("ib_post_recv() failed with ret: %d\n", ret); 851 852 return ret; 853 } 854 855 static int 856 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) 857 { 858 struct ib_device *ib_dev = isert_conn->cm_id->device; 859 struct ib_send_wr send_wr; 860 int ret; 861 862 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, 863 ISER_HEADERS_LEN, DMA_TO_DEVICE); 864 865 tx_desc->tx_cqe.done = isert_login_send_done; 866 867 send_wr.next = NULL; 868 send_wr.wr_cqe = &tx_desc->tx_cqe; 869 send_wr.sg_list = tx_desc->tx_sg; 870 send_wr.num_sge = tx_desc->num_sge; 871 send_wr.opcode = IB_WR_SEND; 872 send_wr.send_flags = IB_SEND_SIGNALED; 873 874 ret = ib_post_send(isert_conn->qp, &send_wr, NULL); 875 if (ret) 876 isert_err("ib_post_send() failed, ret: %d\n", ret); 877 878 return ret; 879 } 880 881 static void 882 __isert_create_send_desc(struct isert_device *device, 883 struct iser_tx_desc *tx_desc) 884 { 885 886 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); 887 tx_desc->iser_header.flags = ISCSI_CTRL; 888 889 tx_desc->num_sge = 1; 890 891 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) { 892 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 893 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); 894 } 895 } 896 897 static void 898 isert_create_send_desc(struct isert_conn *isert_conn, 899 struct isert_cmd *isert_cmd, 900 struct iser_tx_desc *tx_desc) 901 { 902 struct isert_device *device = isert_conn->device; 903 struct ib_device *ib_dev = device->ib_device; 904 905 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, 906 ISER_HEADERS_LEN, DMA_TO_DEVICE); 907 908 __isert_create_send_desc(device, tx_desc); 909 } 910 911 static int 912 isert_init_tx_hdrs(struct isert_conn *isert_conn, 913 struct iser_tx_desc *tx_desc) 914 { 915 struct isert_device *device = isert_conn->device; 916 struct ib_device *ib_dev = device->ib_device; 917 u64 dma_addr; 918 919 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, 920 ISER_HEADERS_LEN, DMA_TO_DEVICE); 921 if (ib_dma_mapping_error(ib_dev, dma_addr)) { 922 isert_err("ib_dma_mapping_error() failed\n"); 923 return -ENOMEM; 924 } 925 926 tx_desc->dma_addr = dma_addr; 927 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 928 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 929 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 930 931 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", 932 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, 933 tx_desc->tx_sg[0].lkey); 934 935 return 0; 936 } 937 938 static void 939 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 940 struct ib_send_wr *send_wr) 941 { 942 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; 943 944 tx_desc->tx_cqe.done = isert_send_done; 945 send_wr->wr_cqe = &tx_desc->tx_cqe; 946 947 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) { 948 send_wr->opcode = IB_WR_SEND_WITH_INV; 949 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey; 950 } else { 951 send_wr->opcode = IB_WR_SEND; 952 } 953 954 send_wr->sg_list = &tx_desc->tx_sg[0]; 955 send_wr->num_sge = isert_cmd->tx_desc.num_sge; 956 send_wr->send_flags = IB_SEND_SIGNALED; 957 } 958 959 static int 960 isert_login_post_recv(struct isert_conn *isert_conn) 961 { 962 struct ib_recv_wr rx_wr; 963 struct ib_sge sge; 964 int ret; 965 966 memset(&sge, 0, sizeof(struct ib_sge)); 967 sge.addr = isert_conn->login_req_dma; 968 sge.length = ISER_RX_PAYLOAD_SIZE; 969 sge.lkey = isert_conn->device->pd->local_dma_lkey; 970 971 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", 972 sge.addr, sge.length, sge.lkey); 973 974 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done; 975 976 memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); 977 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe; 978 rx_wr.sg_list = &sge; 979 rx_wr.num_sge = 1; 980 981 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL); 982 if (ret) 983 isert_err("ib_post_recv() failed: %d\n", ret); 984 985 return ret; 986 } 987 988 static int 989 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 990 u32 length) 991 { 992 struct isert_conn *isert_conn = conn->context; 993 struct isert_device *device = isert_conn->device; 994 struct ib_device *ib_dev = device->ib_device; 995 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; 996 int ret; 997 998 __isert_create_send_desc(device, tx_desc); 999 1000 memcpy(&tx_desc->iscsi_header, &login->rsp[0], 1001 sizeof(struct iscsi_hdr)); 1002 1003 isert_init_tx_hdrs(isert_conn, tx_desc); 1004 1005 if (length > 0) { 1006 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; 1007 1008 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, 1009 length, DMA_TO_DEVICE); 1010 1011 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); 1012 1013 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, 1014 length, DMA_TO_DEVICE); 1015 1016 tx_dsg->addr = isert_conn->login_rsp_dma; 1017 tx_dsg->length = length; 1018 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey; 1019 tx_desc->num_sge = 2; 1020 } 1021 if (!login->login_failed) { 1022 if (login->login_complete) { 1023 ret = isert_alloc_rx_descriptors(isert_conn); 1024 if (ret) 1025 return ret; 1026 1027 ret = isert_post_recvm(isert_conn, 1028 ISERT_QP_MAX_RECV_DTOS); 1029 if (ret) 1030 return ret; 1031 1032 /* Now we are in FULL_FEATURE phase */ 1033 mutex_lock(&isert_conn->mutex); 1034 isert_conn->state = ISER_CONN_FULL_FEATURE; 1035 mutex_unlock(&isert_conn->mutex); 1036 goto post_send; 1037 } 1038 1039 ret = isert_login_post_recv(isert_conn); 1040 if (ret) 1041 return ret; 1042 } 1043 post_send: 1044 ret = isert_login_post_send(isert_conn, tx_desc); 1045 if (ret) 1046 return ret; 1047 1048 return 0; 1049 } 1050 1051 static void 1052 isert_rx_login_req(struct isert_conn *isert_conn) 1053 { 1054 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf; 1055 int rx_buflen = isert_conn->login_req_len; 1056 struct iscsi_conn *conn = isert_conn->conn; 1057 struct iscsi_login *login = conn->conn_login; 1058 int size; 1059 1060 isert_info("conn %p\n", isert_conn); 1061 1062 WARN_ON_ONCE(!login); 1063 1064 if (login->first_request) { 1065 struct iscsi_login_req *login_req = 1066 (struct iscsi_login_req *)&rx_desc->iscsi_header; 1067 /* 1068 * Setup the initial iscsi_login values from the leading 1069 * login request PDU. 1070 */ 1071 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1072 login->current_stage = 1073 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 1074 >> 2; 1075 login->version_min = login_req->min_version; 1076 login->version_max = login_req->max_version; 1077 memcpy(login->isid, login_req->isid, 6); 1078 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1079 login->init_task_tag = login_req->itt; 1080 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1081 login->cid = be16_to_cpu(login_req->cid); 1082 login->tsih = be16_to_cpu(login_req->tsih); 1083 } 1084 1085 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); 1086 1087 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); 1088 isert_dbg("Using login payload size: %d, rx_buflen: %d " 1089 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, 1090 MAX_KEY_VALUE_PAIRS); 1091 memcpy(login->req_buf, &rx_desc->data[0], size); 1092 1093 if (login->first_request) { 1094 complete(&isert_conn->login_comp); 1095 return; 1096 } 1097 schedule_delayed_work(&conn->login_work, 0); 1098 } 1099 1100 static struct iscsi_cmd 1101 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc) 1102 { 1103 struct isert_conn *isert_conn = conn->context; 1104 struct isert_cmd *isert_cmd; 1105 struct iscsi_cmd *cmd; 1106 1107 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 1108 if (!cmd) { 1109 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n"); 1110 return NULL; 1111 } 1112 isert_cmd = iscsit_priv_cmd(cmd); 1113 isert_cmd->conn = isert_conn; 1114 isert_cmd->iscsi_cmd = cmd; 1115 isert_cmd->rx_desc = rx_desc; 1116 1117 return cmd; 1118 } 1119 1120 static int 1121 isert_handle_scsi_cmd(struct isert_conn *isert_conn, 1122 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, 1123 struct iser_rx_desc *rx_desc, unsigned char *buf) 1124 { 1125 struct iscsi_conn *conn = isert_conn->conn; 1126 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1127 int imm_data, imm_data_len, unsol_data, sg_nents, rc; 1128 bool dump_payload = false; 1129 unsigned int data_len; 1130 1131 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1132 if (rc < 0) 1133 return rc; 1134 1135 imm_data = cmd->immediate_data; 1136 imm_data_len = cmd->first_burst_len; 1137 unsol_data = cmd->unsolicited_data; 1138 data_len = cmd->se_cmd.data_length; 1139 1140 if (imm_data && imm_data_len == data_len) 1141 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 1142 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1143 if (rc < 0) { 1144 return 0; 1145 } else if (rc > 0) { 1146 dump_payload = true; 1147 goto sequence_cmd; 1148 } 1149 1150 if (!imm_data) 1151 return 0; 1152 1153 if (imm_data_len != data_len) { 1154 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); 1155 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents, 1156 &rx_desc->data[0], imm_data_len); 1157 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n", 1158 sg_nents, imm_data_len); 1159 } else { 1160 sg_init_table(&isert_cmd->sg, 1); 1161 cmd->se_cmd.t_data_sg = &isert_cmd->sg; 1162 cmd->se_cmd.t_data_nents = 1; 1163 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len); 1164 isert_dbg("Transfer Immediate imm_data_len: %d\n", 1165 imm_data_len); 1166 } 1167 1168 cmd->write_data_done += imm_data_len; 1169 1170 if (cmd->write_data_done == cmd->se_cmd.data_length) { 1171 spin_lock_bh(&cmd->istate_lock); 1172 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1173 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1174 spin_unlock_bh(&cmd->istate_lock); 1175 } 1176 1177 sequence_cmd: 1178 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1179 1180 if (!rc && dump_payload == false && unsol_data) 1181 iscsit_set_unsolicited_dataout(cmd); 1182 else if (dump_payload && imm_data) 1183 target_put_sess_cmd(&cmd->se_cmd); 1184 1185 return 0; 1186 } 1187 1188 static int 1189 isert_handle_iscsi_dataout(struct isert_conn *isert_conn, 1190 struct iser_rx_desc *rx_desc, unsigned char *buf) 1191 { 1192 struct scatterlist *sg_start; 1193 struct iscsi_conn *conn = isert_conn->conn; 1194 struct iscsi_cmd *cmd = NULL; 1195 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1196 u32 unsol_data_len = ntoh24(hdr->dlength); 1197 int rc, sg_nents, sg_off, page_off; 1198 1199 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1200 if (rc < 0) 1201 return rc; 1202 else if (!cmd) 1203 return 0; 1204 /* 1205 * FIXME: Unexpected unsolicited_data out 1206 */ 1207 if (!cmd->unsolicited_data) { 1208 isert_err("Received unexpected solicited data payload\n"); 1209 dump_stack(); 1210 return -1; 1211 } 1212 1213 isert_dbg("Unsolicited DataOut unsol_data_len: %u, " 1214 "write_data_done: %u, data_length: %u\n", 1215 unsol_data_len, cmd->write_data_done, 1216 cmd->se_cmd.data_length); 1217 1218 sg_off = cmd->write_data_done / PAGE_SIZE; 1219 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 1220 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); 1221 page_off = cmd->write_data_done % PAGE_SIZE; 1222 /* 1223 * FIXME: Non page-aligned unsolicited_data out 1224 */ 1225 if (page_off) { 1226 isert_err("unexpected non-page aligned data payload\n"); 1227 dump_stack(); 1228 return -1; 1229 } 1230 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " 1231 "sg_nents: %u from %p %u\n", sg_start, sg_off, 1232 sg_nents, &rx_desc->data[0], unsol_data_len); 1233 1234 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], 1235 unsol_data_len); 1236 1237 rc = iscsit_check_dataout_payload(cmd, hdr, false); 1238 if (rc < 0) 1239 return rc; 1240 1241 /* 1242 * multiple data-outs on the same command can arrive - 1243 * so post the buffer before hand 1244 */ 1245 rc = isert_post_recv(isert_conn, rx_desc); 1246 if (rc) { 1247 isert_err("ib_post_recv failed with %d\n", rc); 1248 return rc; 1249 } 1250 return 0; 1251 } 1252 1253 static int 1254 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1255 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1256 unsigned char *buf) 1257 { 1258 struct iscsi_conn *conn = isert_conn->conn; 1259 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1260 int rc; 1261 1262 rc = iscsit_setup_nop_out(conn, cmd, hdr); 1263 if (rc < 0) 1264 return rc; 1265 /* 1266 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload 1267 */ 1268 1269 return iscsit_process_nop_out(conn, cmd, hdr); 1270 } 1271 1272 static int 1273 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1274 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1275 struct iscsi_text *hdr) 1276 { 1277 struct iscsi_conn *conn = isert_conn->conn; 1278 u32 payload_length = ntoh24(hdr->dlength); 1279 int rc; 1280 unsigned char *text_in = NULL; 1281 1282 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 1283 if (rc < 0) 1284 return rc; 1285 1286 if (payload_length) { 1287 text_in = kzalloc(payload_length, GFP_KERNEL); 1288 if (!text_in) 1289 return -ENOMEM; 1290 } 1291 cmd->text_in_ptr = text_in; 1292 1293 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); 1294 1295 return iscsit_process_text_cmd(conn, cmd, hdr); 1296 } 1297 1298 static int 1299 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, 1300 uint32_t read_stag, uint64_t read_va, 1301 uint32_t write_stag, uint64_t write_va) 1302 { 1303 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1304 struct iscsi_conn *conn = isert_conn->conn; 1305 struct iscsi_cmd *cmd; 1306 struct isert_cmd *isert_cmd; 1307 int ret = -EINVAL; 1308 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); 1309 1310 if (conn->sess->sess_ops->SessionType && 1311 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { 1312 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," 1313 " ignoring\n", opcode); 1314 return 0; 1315 } 1316 1317 switch (opcode) { 1318 case ISCSI_OP_SCSI_CMD: 1319 cmd = isert_allocate_cmd(conn, rx_desc); 1320 if (!cmd) 1321 break; 1322 1323 isert_cmd = iscsit_priv_cmd(cmd); 1324 isert_cmd->read_stag = read_stag; 1325 isert_cmd->read_va = read_va; 1326 isert_cmd->write_stag = write_stag; 1327 isert_cmd->write_va = write_va; 1328 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag; 1329 1330 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, 1331 rx_desc, (unsigned char *)hdr); 1332 break; 1333 case ISCSI_OP_NOOP_OUT: 1334 cmd = isert_allocate_cmd(conn, rx_desc); 1335 if (!cmd) 1336 break; 1337 1338 isert_cmd = iscsit_priv_cmd(cmd); 1339 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, 1340 rx_desc, (unsigned char *)hdr); 1341 break; 1342 case ISCSI_OP_SCSI_DATA_OUT: 1343 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, 1344 (unsigned char *)hdr); 1345 break; 1346 case ISCSI_OP_SCSI_TMFUNC: 1347 cmd = isert_allocate_cmd(conn, rx_desc); 1348 if (!cmd) 1349 break; 1350 1351 ret = iscsit_handle_task_mgt_cmd(conn, cmd, 1352 (unsigned char *)hdr); 1353 break; 1354 case ISCSI_OP_LOGOUT: 1355 cmd = isert_allocate_cmd(conn, rx_desc); 1356 if (!cmd) 1357 break; 1358 1359 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); 1360 break; 1361 case ISCSI_OP_TEXT: 1362 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) 1363 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 1364 else 1365 cmd = isert_allocate_cmd(conn, rx_desc); 1366 1367 if (!cmd) 1368 break; 1369 1370 isert_cmd = iscsit_priv_cmd(cmd); 1371 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, 1372 rx_desc, (struct iscsi_text *)hdr); 1373 break; 1374 default: 1375 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); 1376 dump_stack(); 1377 break; 1378 } 1379 1380 return ret; 1381 } 1382 1383 static void 1384 isert_print_wc(struct ib_wc *wc, const char *type) 1385 { 1386 if (wc->status != IB_WC_WR_FLUSH_ERR) 1387 isert_err("%s failure: %s (%d) vend_err %x\n", type, 1388 ib_wc_status_msg(wc->status), wc->status, 1389 wc->vendor_err); 1390 else 1391 isert_dbg("%s failure: %s (%d)\n", type, 1392 ib_wc_status_msg(wc->status), wc->status); 1393 } 1394 1395 static void 1396 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc) 1397 { 1398 struct isert_conn *isert_conn = wc->qp->qp_context; 1399 struct ib_device *ib_dev = isert_conn->cm_id->device; 1400 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe); 1401 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1402 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header; 1403 uint64_t read_va = 0, write_va = 0; 1404 uint32_t read_stag = 0, write_stag = 0; 1405 1406 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1407 isert_print_wc(wc, "recv"); 1408 if (wc->status != IB_WC_WR_FLUSH_ERR) 1409 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1410 return; 1411 } 1412 1413 rx_desc->in_use = true; 1414 1415 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr, 1416 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1417 1418 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", 1419 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags, 1420 (int)(wc->byte_len - ISER_HEADERS_LEN)); 1421 1422 switch (iser_ctrl->flags & 0xF0) { 1423 case ISCSI_CTRL: 1424 if (iser_ctrl->flags & ISER_RSV) { 1425 read_stag = be32_to_cpu(iser_ctrl->read_stag); 1426 read_va = be64_to_cpu(iser_ctrl->read_va); 1427 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", 1428 read_stag, (unsigned long long)read_va); 1429 } 1430 if (iser_ctrl->flags & ISER_WSV) { 1431 write_stag = be32_to_cpu(iser_ctrl->write_stag); 1432 write_va = be64_to_cpu(iser_ctrl->write_va); 1433 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", 1434 write_stag, (unsigned long long)write_va); 1435 } 1436 1437 isert_dbg("ISER ISCSI_CTRL PDU\n"); 1438 break; 1439 case ISER_HELLO: 1440 isert_err("iSER Hello message\n"); 1441 break; 1442 default: 1443 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags); 1444 break; 1445 } 1446 1447 isert_rx_opcode(isert_conn, rx_desc, 1448 read_stag, read_va, write_stag, write_va); 1449 1450 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr, 1451 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1452 } 1453 1454 static void 1455 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc) 1456 { 1457 struct isert_conn *isert_conn = wc->qp->qp_context; 1458 struct ib_device *ib_dev = isert_conn->device->ib_device; 1459 1460 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1461 isert_print_wc(wc, "login recv"); 1462 return; 1463 } 1464 1465 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma, 1466 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1467 1468 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN; 1469 1470 if (isert_conn->conn) { 1471 struct iscsi_login *login = isert_conn->conn->conn_login; 1472 1473 if (login && !login->first_request) 1474 isert_rx_login_req(isert_conn); 1475 } 1476 1477 mutex_lock(&isert_conn->mutex); 1478 complete(&isert_conn->login_req_comp); 1479 mutex_unlock(&isert_conn->mutex); 1480 1481 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma, 1482 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1483 } 1484 1485 static void 1486 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn) 1487 { 1488 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; 1489 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); 1490 1491 if (!cmd->rw.nr_ops) 1492 return; 1493 1494 if (isert_prot_cmd(conn, se_cmd)) { 1495 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp, 1496 conn->cm_id->port_num, se_cmd->t_data_sg, 1497 se_cmd->t_data_nents, se_cmd->t_prot_sg, 1498 se_cmd->t_prot_nents, dir); 1499 } else { 1500 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num, 1501 se_cmd->t_data_sg, se_cmd->t_data_nents, dir); 1502 } 1503 1504 cmd->rw.nr_ops = 0; 1505 } 1506 1507 static void 1508 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) 1509 { 1510 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1511 struct isert_conn *isert_conn = isert_cmd->conn; 1512 struct iscsi_conn *conn = isert_conn->conn; 1513 struct iscsi_text_rsp *hdr; 1514 1515 isert_dbg("Cmd %p\n", isert_cmd); 1516 1517 switch (cmd->iscsi_opcode) { 1518 case ISCSI_OP_SCSI_CMD: 1519 spin_lock_bh(&conn->cmd_lock); 1520 if (!list_empty(&cmd->i_conn_node)) 1521 list_del_init(&cmd->i_conn_node); 1522 spin_unlock_bh(&conn->cmd_lock); 1523 1524 if (cmd->data_direction == DMA_TO_DEVICE) { 1525 iscsit_stop_dataout_timer(cmd); 1526 /* 1527 * Check for special case during comp_err where 1528 * WRITE_PENDING has been handed off from core, 1529 * but requires an extra target_put_sess_cmd() 1530 * before transport_generic_free_cmd() below. 1531 */ 1532 if (comp_err && 1533 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 1534 struct se_cmd *se_cmd = &cmd->se_cmd; 1535 1536 target_put_sess_cmd(se_cmd); 1537 } 1538 } 1539 1540 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1541 transport_generic_free_cmd(&cmd->se_cmd, 0); 1542 break; 1543 case ISCSI_OP_SCSI_TMFUNC: 1544 spin_lock_bh(&conn->cmd_lock); 1545 if (!list_empty(&cmd->i_conn_node)) 1546 list_del_init(&cmd->i_conn_node); 1547 spin_unlock_bh(&conn->cmd_lock); 1548 1549 transport_generic_free_cmd(&cmd->se_cmd, 0); 1550 break; 1551 case ISCSI_OP_REJECT: 1552 case ISCSI_OP_NOOP_OUT: 1553 case ISCSI_OP_TEXT: 1554 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 1555 /* If the continue bit is on, keep the command alive */ 1556 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) 1557 break; 1558 1559 spin_lock_bh(&conn->cmd_lock); 1560 if (!list_empty(&cmd->i_conn_node)) 1561 list_del_init(&cmd->i_conn_node); 1562 spin_unlock_bh(&conn->cmd_lock); 1563 1564 /* 1565 * Handle special case for REJECT when iscsi_add_reject*() has 1566 * overwritten the original iscsi_opcode assignment, and the 1567 * associated cmd->se_cmd needs to be released. 1568 */ 1569 if (cmd->se_cmd.se_tfo != NULL) { 1570 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", 1571 cmd->iscsi_opcode); 1572 transport_generic_free_cmd(&cmd->se_cmd, 0); 1573 break; 1574 } 1575 /* fall through */ 1576 default: 1577 iscsit_release_cmd(cmd); 1578 break; 1579 } 1580 } 1581 1582 static void 1583 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) 1584 { 1585 if (tx_desc->dma_addr != 0) { 1586 isert_dbg("unmap single for tx_desc->dma_addr\n"); 1587 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, 1588 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1589 tx_desc->dma_addr = 0; 1590 } 1591 } 1592 1593 static void 1594 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, 1595 struct ib_device *ib_dev, bool comp_err) 1596 { 1597 if (isert_cmd->pdu_buf_dma != 0) { 1598 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n"); 1599 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, 1600 isert_cmd->pdu_buf_len, DMA_TO_DEVICE); 1601 isert_cmd->pdu_buf_dma = 0; 1602 } 1603 1604 isert_unmap_tx_desc(tx_desc, ib_dev); 1605 isert_put_cmd(isert_cmd, comp_err); 1606 } 1607 1608 static int 1609 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) 1610 { 1611 struct ib_mr_status mr_status; 1612 int ret; 1613 1614 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); 1615 if (ret) { 1616 isert_err("ib_check_mr_status failed, ret %d\n", ret); 1617 goto fail_mr_status; 1618 } 1619 1620 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1621 u64 sec_offset_err; 1622 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; 1623 1624 switch (mr_status.sig_err.err_type) { 1625 case IB_SIG_BAD_GUARD: 1626 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1627 break; 1628 case IB_SIG_BAD_REFTAG: 1629 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1630 break; 1631 case IB_SIG_BAD_APPTAG: 1632 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; 1633 break; 1634 } 1635 sec_offset_err = mr_status.sig_err.sig_err_offset; 1636 do_div(sec_offset_err, block_size); 1637 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; 1638 1639 isert_err("PI error found type %d at sector 0x%llx " 1640 "expected 0x%x vs actual 0x%x\n", 1641 mr_status.sig_err.err_type, 1642 (unsigned long long)se_cmd->bad_sector, 1643 mr_status.sig_err.expected, 1644 mr_status.sig_err.actual); 1645 ret = 1; 1646 } 1647 1648 fail_mr_status: 1649 return ret; 1650 } 1651 1652 static void 1653 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) 1654 { 1655 struct isert_conn *isert_conn = wc->qp->qp_context; 1656 struct isert_device *device = isert_conn->device; 1657 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); 1658 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); 1659 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd; 1660 int ret = 0; 1661 1662 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1663 isert_print_wc(wc, "rdma write"); 1664 if (wc->status != IB_WC_WR_FLUSH_ERR) 1665 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1666 isert_completion_put(desc, isert_cmd, device->ib_device, true); 1667 return; 1668 } 1669 1670 isert_dbg("Cmd %p\n", isert_cmd); 1671 1672 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr); 1673 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1674 1675 if (ret) { 1676 /* 1677 * transport_generic_request_failure() expects to have 1678 * plus two references to handle queue-full, so re-add 1679 * one here as target-core will have already dropped 1680 * it after the first isert_put_datain() callback. 1681 */ 1682 kref_get(&cmd->cmd_kref); 1683 transport_generic_request_failure(cmd, cmd->pi_err); 1684 } else { 1685 /* 1686 * XXX: isert_put_response() failure is not retried. 1687 */ 1688 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd); 1689 if (ret) 1690 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret); 1691 } 1692 } 1693 1694 static void 1695 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) 1696 { 1697 struct isert_conn *isert_conn = wc->qp->qp_context; 1698 struct isert_device *device = isert_conn->device; 1699 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); 1700 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); 1701 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1702 struct se_cmd *se_cmd = &cmd->se_cmd; 1703 int ret = 0; 1704 1705 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1706 isert_print_wc(wc, "rdma read"); 1707 if (wc->status != IB_WC_WR_FLUSH_ERR) 1708 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1709 isert_completion_put(desc, isert_cmd, device->ib_device, true); 1710 return; 1711 } 1712 1713 isert_dbg("Cmd %p\n", isert_cmd); 1714 1715 iscsit_stop_dataout_timer(cmd); 1716 1717 if (isert_prot_cmd(isert_conn, se_cmd)) 1718 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr); 1719 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1720 cmd->write_data_done = 0; 1721 1722 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); 1723 spin_lock_bh(&cmd->istate_lock); 1724 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1725 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1726 spin_unlock_bh(&cmd->istate_lock); 1727 1728 /* 1729 * transport_generic_request_failure() will drop the extra 1730 * se_cmd->cmd_kref reference after T10-PI error, and handle 1731 * any non-zero ->queue_status() callback error retries. 1732 */ 1733 if (ret) 1734 transport_generic_request_failure(se_cmd, se_cmd->pi_err); 1735 else 1736 target_execute_cmd(se_cmd); 1737 } 1738 1739 static void 1740 isert_do_control_comp(struct work_struct *work) 1741 { 1742 struct isert_cmd *isert_cmd = container_of(work, 1743 struct isert_cmd, comp_work); 1744 struct isert_conn *isert_conn = isert_cmd->conn; 1745 struct ib_device *ib_dev = isert_conn->cm_id->device; 1746 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1747 1748 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); 1749 1750 switch (cmd->i_state) { 1751 case ISTATE_SEND_TASKMGTRSP: 1752 iscsit_tmr_post_handler(cmd, cmd->conn); 1753 /* fall through */ 1754 case ISTATE_SEND_REJECT: 1755 case ISTATE_SEND_TEXTRSP: 1756 cmd->i_state = ISTATE_SENT_STATUS; 1757 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, 1758 ib_dev, false); 1759 break; 1760 case ISTATE_SEND_LOGOUTRSP: 1761 iscsit_logout_post_handler(cmd, cmd->conn); 1762 break; 1763 default: 1764 isert_err("Unknown i_state %d\n", cmd->i_state); 1765 dump_stack(); 1766 break; 1767 } 1768 } 1769 1770 static void 1771 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc) 1772 { 1773 struct isert_conn *isert_conn = wc->qp->qp_context; 1774 struct ib_device *ib_dev = isert_conn->cm_id->device; 1775 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); 1776 1777 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1778 isert_print_wc(wc, "login send"); 1779 if (wc->status != IB_WC_WR_FLUSH_ERR) 1780 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1781 } 1782 1783 isert_unmap_tx_desc(tx_desc, ib_dev); 1784 } 1785 1786 static void 1787 isert_send_done(struct ib_cq *cq, struct ib_wc *wc) 1788 { 1789 struct isert_conn *isert_conn = wc->qp->qp_context; 1790 struct ib_device *ib_dev = isert_conn->cm_id->device; 1791 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); 1792 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc); 1793 1794 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1795 isert_print_wc(wc, "send"); 1796 if (wc->status != IB_WC_WR_FLUSH_ERR) 1797 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1798 isert_completion_put(tx_desc, isert_cmd, ib_dev, true); 1799 return; 1800 } 1801 1802 isert_dbg("Cmd %p\n", isert_cmd); 1803 1804 switch (isert_cmd->iscsi_cmd->i_state) { 1805 case ISTATE_SEND_TASKMGTRSP: 1806 case ISTATE_SEND_LOGOUTRSP: 1807 case ISTATE_SEND_REJECT: 1808 case ISTATE_SEND_TEXTRSP: 1809 isert_unmap_tx_desc(tx_desc, ib_dev); 1810 1811 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); 1812 queue_work(isert_comp_wq, &isert_cmd->comp_work); 1813 return; 1814 default: 1815 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS; 1816 isert_completion_put(tx_desc, isert_cmd, ib_dev, false); 1817 break; 1818 } 1819 } 1820 1821 static int 1822 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) 1823 { 1824 int ret; 1825 1826 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc); 1827 if (ret) { 1828 isert_err("ib_post_recv failed with %d\n", ret); 1829 return ret; 1830 } 1831 1832 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL); 1833 if (ret) { 1834 isert_err("ib_post_send failed with %d\n", ret); 1835 return ret; 1836 } 1837 return ret; 1838 } 1839 1840 static int 1841 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 1842 { 1843 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1844 struct isert_conn *isert_conn = conn->context; 1845 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1846 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) 1847 &isert_cmd->tx_desc.iscsi_header; 1848 1849 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1850 iscsit_build_rsp_pdu(cmd, conn, true, hdr); 1851 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1852 /* 1853 * Attach SENSE DATA payload to iSCSI Response PDU 1854 */ 1855 if (cmd->se_cmd.sense_buffer && 1856 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 1857 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 1858 struct isert_device *device = isert_conn->device; 1859 struct ib_device *ib_dev = device->ib_device; 1860 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 1861 u32 padding, pdu_len; 1862 1863 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, 1864 cmd->sense_buffer); 1865 cmd->se_cmd.scsi_sense_length += sizeof(__be16); 1866 1867 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 1868 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 1869 pdu_len = cmd->se_cmd.scsi_sense_length + padding; 1870 1871 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 1872 (void *)cmd->sense_buffer, pdu_len, 1873 DMA_TO_DEVICE); 1874 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) 1875 return -ENOMEM; 1876 1877 isert_cmd->pdu_buf_len = pdu_len; 1878 tx_dsg->addr = isert_cmd->pdu_buf_dma; 1879 tx_dsg->length = pdu_len; 1880 tx_dsg->lkey = device->pd->local_dma_lkey; 1881 isert_cmd->tx_desc.num_sge = 2; 1882 } 1883 1884 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1885 1886 isert_dbg("Posting SCSI Response\n"); 1887 1888 return isert_post_response(isert_conn, isert_cmd); 1889 } 1890 1891 static void 1892 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 1893 { 1894 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1895 struct isert_conn *isert_conn = conn->context; 1896 1897 spin_lock_bh(&conn->cmd_lock); 1898 if (!list_empty(&cmd->i_conn_node)) 1899 list_del_init(&cmd->i_conn_node); 1900 spin_unlock_bh(&conn->cmd_lock); 1901 1902 if (cmd->data_direction == DMA_TO_DEVICE) 1903 iscsit_stop_dataout_timer(cmd); 1904 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1905 } 1906 1907 static enum target_prot_op 1908 isert_get_sup_prot_ops(struct iscsi_conn *conn) 1909 { 1910 struct isert_conn *isert_conn = conn->context; 1911 struct isert_device *device = isert_conn->device; 1912 1913 if (conn->tpg->tpg_attrib.t10_pi) { 1914 if (device->pi_capable) { 1915 isert_info("conn %p PI offload enabled\n", isert_conn); 1916 isert_conn->pi_support = true; 1917 return TARGET_PROT_ALL; 1918 } 1919 } 1920 1921 isert_info("conn %p PI offload disabled\n", isert_conn); 1922 isert_conn->pi_support = false; 1923 1924 return TARGET_PROT_NORMAL; 1925 } 1926 1927 static int 1928 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 1929 bool nopout_response) 1930 { 1931 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1932 struct isert_conn *isert_conn = conn->context; 1933 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1934 1935 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1936 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) 1937 &isert_cmd->tx_desc.iscsi_header, 1938 nopout_response); 1939 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1940 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1941 1942 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); 1943 1944 return isert_post_response(isert_conn, isert_cmd); 1945 } 1946 1947 static int 1948 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1949 { 1950 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1951 struct isert_conn *isert_conn = conn->context; 1952 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1953 1954 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1955 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) 1956 &isert_cmd->tx_desc.iscsi_header); 1957 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1958 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1959 1960 isert_dbg("conn %p Posting Logout Response\n", isert_conn); 1961 1962 return isert_post_response(isert_conn, isert_cmd); 1963 } 1964 1965 static int 1966 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1967 { 1968 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1969 struct isert_conn *isert_conn = conn->context; 1970 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1971 1972 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1973 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) 1974 &isert_cmd->tx_desc.iscsi_header); 1975 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1976 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1977 1978 isert_dbg("conn %p Posting Task Management Response\n", isert_conn); 1979 1980 return isert_post_response(isert_conn, isert_cmd); 1981 } 1982 1983 static int 1984 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1985 { 1986 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1987 struct isert_conn *isert_conn = conn->context; 1988 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1989 struct isert_device *device = isert_conn->device; 1990 struct ib_device *ib_dev = device->ib_device; 1991 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 1992 struct iscsi_reject *hdr = 1993 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; 1994 1995 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1996 iscsit_build_reject(cmd, conn, hdr); 1997 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1998 1999 hton24(hdr->dlength, ISCSI_HDR_LEN); 2000 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2001 (void *)cmd->buf_ptr, ISCSI_HDR_LEN, 2002 DMA_TO_DEVICE); 2003 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) 2004 return -ENOMEM; 2005 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; 2006 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2007 tx_dsg->length = ISCSI_HDR_LEN; 2008 tx_dsg->lkey = device->pd->local_dma_lkey; 2009 isert_cmd->tx_desc.num_sge = 2; 2010 2011 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2012 2013 isert_dbg("conn %p Posting Reject\n", isert_conn); 2014 2015 return isert_post_response(isert_conn, isert_cmd); 2016 } 2017 2018 static int 2019 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2020 { 2021 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2022 struct isert_conn *isert_conn = conn->context; 2023 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2024 struct iscsi_text_rsp *hdr = 2025 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 2026 u32 txt_rsp_len; 2027 int rc; 2028 2029 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2030 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); 2031 if (rc < 0) 2032 return rc; 2033 2034 txt_rsp_len = rc; 2035 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2036 2037 if (txt_rsp_len) { 2038 struct isert_device *device = isert_conn->device; 2039 struct ib_device *ib_dev = device->ib_device; 2040 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2041 void *txt_rsp_buf = cmd->buf_ptr; 2042 2043 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2044 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); 2045 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma)) 2046 return -ENOMEM; 2047 2048 isert_cmd->pdu_buf_len = txt_rsp_len; 2049 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2050 tx_dsg->length = txt_rsp_len; 2051 tx_dsg->lkey = device->pd->local_dma_lkey; 2052 isert_cmd->tx_desc.num_sge = 2; 2053 } 2054 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2055 2056 isert_dbg("conn %p Text Response\n", isert_conn); 2057 2058 return isert_post_response(isert_conn, isert_cmd); 2059 } 2060 2061 static inline void 2062 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs, 2063 struct ib_sig_domain *domain) 2064 { 2065 domain->sig_type = IB_SIG_TYPE_T10_DIF; 2066 domain->sig.dif.bg_type = IB_T10DIF_CRC; 2067 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; 2068 domain->sig.dif.ref_tag = se_cmd->reftag_seed; 2069 /* 2070 * At the moment we hard code those, but if in the future 2071 * the target core would like to use it, we will take it 2072 * from se_cmd. 2073 */ 2074 domain->sig.dif.apptag_check_mask = 0xffff; 2075 domain->sig.dif.app_escape = true; 2076 domain->sig.dif.ref_escape = true; 2077 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || 2078 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) 2079 domain->sig.dif.ref_remap = true; 2080 }; 2081 2082 static int 2083 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) 2084 { 2085 memset(sig_attrs, 0, sizeof(*sig_attrs)); 2086 2087 switch (se_cmd->prot_op) { 2088 case TARGET_PROT_DIN_INSERT: 2089 case TARGET_PROT_DOUT_STRIP: 2090 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; 2091 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2092 break; 2093 case TARGET_PROT_DOUT_INSERT: 2094 case TARGET_PROT_DIN_STRIP: 2095 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 2096 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2097 break; 2098 case TARGET_PROT_DIN_PASS: 2099 case TARGET_PROT_DOUT_PASS: 2100 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2101 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2102 break; 2103 default: 2104 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); 2105 return -EINVAL; 2106 } 2107 2108 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD) 2109 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD; 2110 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG) 2111 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG; 2112 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG) 2113 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG; 2114 2115 return 0; 2116 } 2117 2118 static int 2119 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, 2120 struct ib_cqe *cqe, struct ib_send_wr *chain_wr) 2121 { 2122 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; 2123 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); 2124 u8 port_num = conn->cm_id->port_num; 2125 u64 addr; 2126 u32 rkey, offset; 2127 int ret; 2128 2129 if (cmd->ctx_init_done) 2130 goto rdma_ctx_post; 2131 2132 if (dir == DMA_FROM_DEVICE) { 2133 addr = cmd->write_va; 2134 rkey = cmd->write_stag; 2135 offset = cmd->iscsi_cmd->write_data_done; 2136 } else { 2137 addr = cmd->read_va; 2138 rkey = cmd->read_stag; 2139 offset = 0; 2140 } 2141 2142 if (isert_prot_cmd(conn, se_cmd)) { 2143 struct ib_sig_attrs sig_attrs; 2144 2145 ret = isert_set_sig_attrs(se_cmd, &sig_attrs); 2146 if (ret) 2147 return ret; 2148 2149 WARN_ON_ONCE(offset); 2150 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num, 2151 se_cmd->t_data_sg, se_cmd->t_data_nents, 2152 se_cmd->t_prot_sg, se_cmd->t_prot_nents, 2153 &sig_attrs, addr, rkey, dir); 2154 } else { 2155 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num, 2156 se_cmd->t_data_sg, se_cmd->t_data_nents, 2157 offset, addr, rkey, dir); 2158 } 2159 2160 if (ret < 0) { 2161 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd); 2162 return ret; 2163 } 2164 2165 cmd->ctx_init_done = true; 2166 2167 rdma_ctx_post: 2168 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr); 2169 if (ret < 0) 2170 isert_err("Cmd: %p failed to post RDMA res\n", cmd); 2171 return ret; 2172 } 2173 2174 static int 2175 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2176 { 2177 struct se_cmd *se_cmd = &cmd->se_cmd; 2178 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2179 struct isert_conn *isert_conn = conn->context; 2180 struct ib_cqe *cqe = NULL; 2181 struct ib_send_wr *chain_wr = NULL; 2182 int rc; 2183 2184 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", 2185 isert_cmd, se_cmd->data_length); 2186 2187 if (isert_prot_cmd(isert_conn, se_cmd)) { 2188 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done; 2189 cqe = &isert_cmd->tx_desc.tx_cqe; 2190 } else { 2191 /* 2192 * Build isert_conn->tx_desc for iSCSI response PDU and attach 2193 */ 2194 isert_create_send_desc(isert_conn, isert_cmd, 2195 &isert_cmd->tx_desc); 2196 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) 2197 &isert_cmd->tx_desc.iscsi_header); 2198 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2199 isert_init_send_wr(isert_conn, isert_cmd, 2200 &isert_cmd->tx_desc.send_wr); 2201 2202 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc); 2203 if (rc) { 2204 isert_err("ib_post_recv failed with %d\n", rc); 2205 return rc; 2206 } 2207 2208 chain_wr = &isert_cmd->tx_desc.send_wr; 2209 } 2210 2211 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr); 2212 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n", 2213 isert_cmd, rc); 2214 return rc; 2215 } 2216 2217 static int 2218 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) 2219 { 2220 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2221 int ret; 2222 2223 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", 2224 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done); 2225 2226 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done; 2227 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context, 2228 &isert_cmd->tx_desc.tx_cqe, NULL); 2229 2230 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n", 2231 isert_cmd, ret); 2232 return ret; 2233 } 2234 2235 static int 2236 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 2237 { 2238 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2239 int ret = 0; 2240 2241 switch (state) { 2242 case ISTATE_REMOVE: 2243 spin_lock_bh(&conn->cmd_lock); 2244 list_del_init(&cmd->i_conn_node); 2245 spin_unlock_bh(&conn->cmd_lock); 2246 isert_put_cmd(isert_cmd, true); 2247 break; 2248 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 2249 ret = isert_put_nopin(cmd, conn, false); 2250 break; 2251 default: 2252 isert_err("Unknown immediate state: 0x%02x\n", state); 2253 ret = -EINVAL; 2254 break; 2255 } 2256 2257 return ret; 2258 } 2259 2260 static int 2261 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 2262 { 2263 struct isert_conn *isert_conn = conn->context; 2264 int ret; 2265 2266 switch (state) { 2267 case ISTATE_SEND_LOGOUTRSP: 2268 ret = isert_put_logout_rsp(cmd, conn); 2269 if (!ret) 2270 isert_conn->logout_posted = true; 2271 break; 2272 case ISTATE_SEND_NOPIN: 2273 ret = isert_put_nopin(cmd, conn, true); 2274 break; 2275 case ISTATE_SEND_TASKMGTRSP: 2276 ret = isert_put_tm_rsp(cmd, conn); 2277 break; 2278 case ISTATE_SEND_REJECT: 2279 ret = isert_put_reject(cmd, conn); 2280 break; 2281 case ISTATE_SEND_TEXTRSP: 2282 ret = isert_put_text_rsp(cmd, conn); 2283 break; 2284 case ISTATE_SEND_STATUS: 2285 /* 2286 * Special case for sending non GOOD SCSI status from TX thread 2287 * context during pre se_cmd excecution failure. 2288 */ 2289 ret = isert_put_response(conn, cmd); 2290 break; 2291 default: 2292 isert_err("Unknown response state: 0x%02x\n", state); 2293 ret = -EINVAL; 2294 break; 2295 } 2296 2297 return ret; 2298 } 2299 2300 struct rdma_cm_id * 2301 isert_setup_id(struct isert_np *isert_np) 2302 { 2303 struct iscsi_np *np = isert_np->np; 2304 struct rdma_cm_id *id; 2305 struct sockaddr *sa; 2306 int ret; 2307 2308 sa = (struct sockaddr *)&np->np_sockaddr; 2309 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); 2310 2311 id = rdma_create_id(&init_net, isert_cma_handler, isert_np, 2312 RDMA_PS_TCP, IB_QPT_RC); 2313 if (IS_ERR(id)) { 2314 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); 2315 ret = PTR_ERR(id); 2316 goto out; 2317 } 2318 isert_dbg("id %p context %p\n", id, id->context); 2319 2320 ret = rdma_bind_addr(id, sa); 2321 if (ret) { 2322 isert_err("rdma_bind_addr() failed: %d\n", ret); 2323 goto out_id; 2324 } 2325 2326 ret = rdma_listen(id, 0); 2327 if (ret) { 2328 isert_err("rdma_listen() failed: %d\n", ret); 2329 goto out_id; 2330 } 2331 2332 return id; 2333 out_id: 2334 rdma_destroy_id(id); 2335 out: 2336 return ERR_PTR(ret); 2337 } 2338 2339 static int 2340 isert_setup_np(struct iscsi_np *np, 2341 struct sockaddr_storage *ksockaddr) 2342 { 2343 struct isert_np *isert_np; 2344 struct rdma_cm_id *isert_lid; 2345 int ret; 2346 2347 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); 2348 if (!isert_np) 2349 return -ENOMEM; 2350 2351 sema_init(&isert_np->sem, 0); 2352 mutex_init(&isert_np->mutex); 2353 INIT_LIST_HEAD(&isert_np->accepted); 2354 INIT_LIST_HEAD(&isert_np->pending); 2355 isert_np->np = np; 2356 2357 /* 2358 * Setup the np->np_sockaddr from the passed sockaddr setup 2359 * in iscsi_target_configfs.c code.. 2360 */ 2361 memcpy(&np->np_sockaddr, ksockaddr, 2362 sizeof(struct sockaddr_storage)); 2363 2364 isert_lid = isert_setup_id(isert_np); 2365 if (IS_ERR(isert_lid)) { 2366 ret = PTR_ERR(isert_lid); 2367 goto out; 2368 } 2369 2370 isert_np->cm_id = isert_lid; 2371 np->np_context = isert_np; 2372 2373 return 0; 2374 2375 out: 2376 kfree(isert_np); 2377 2378 return ret; 2379 } 2380 2381 static int 2382 isert_rdma_accept(struct isert_conn *isert_conn) 2383 { 2384 struct rdma_cm_id *cm_id = isert_conn->cm_id; 2385 struct rdma_conn_param cp; 2386 int ret; 2387 struct iser_cm_hdr rsp_hdr; 2388 2389 memset(&cp, 0, sizeof(struct rdma_conn_param)); 2390 cp.initiator_depth = isert_conn->initiator_depth; 2391 cp.retry_count = 7; 2392 cp.rnr_retry_count = 7; 2393 2394 memset(&rsp_hdr, 0, sizeof(rsp_hdr)); 2395 rsp_hdr.flags = ISERT_ZBVA_NOT_USED; 2396 if (!isert_conn->snd_w_inv) 2397 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED; 2398 cp.private_data = (void *)&rsp_hdr; 2399 cp.private_data_len = sizeof(rsp_hdr); 2400 2401 ret = rdma_accept(cm_id, &cp); 2402 if (ret) { 2403 isert_err("rdma_accept() failed with: %d\n", ret); 2404 return ret; 2405 } 2406 2407 return 0; 2408 } 2409 2410 static int 2411 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 2412 { 2413 struct isert_conn *isert_conn = conn->context; 2414 int ret; 2415 2416 isert_info("before login_req comp conn: %p\n", isert_conn); 2417 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); 2418 if (ret) { 2419 isert_err("isert_conn %p interrupted before got login req\n", 2420 isert_conn); 2421 return ret; 2422 } 2423 reinit_completion(&isert_conn->login_req_comp); 2424 2425 /* 2426 * For login requests after the first PDU, isert_rx_login_req() will 2427 * kick schedule_delayed_work(&conn->login_work) as the packet is 2428 * received, which turns this callback from iscsi_target_do_login_rx() 2429 * into a NOP. 2430 */ 2431 if (!login->first_request) 2432 return 0; 2433 2434 isert_rx_login_req(isert_conn); 2435 2436 isert_info("before login_comp conn: %p\n", conn); 2437 ret = wait_for_completion_interruptible(&isert_conn->login_comp); 2438 if (ret) 2439 return ret; 2440 2441 isert_info("processing login->req: %p\n", login->req); 2442 2443 return 0; 2444 } 2445 2446 static void 2447 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, 2448 struct isert_conn *isert_conn) 2449 { 2450 struct rdma_cm_id *cm_id = isert_conn->cm_id; 2451 struct rdma_route *cm_route = &cm_id->route; 2452 2453 conn->login_family = np->np_sockaddr.ss_family; 2454 2455 conn->login_sockaddr = cm_route->addr.dst_addr; 2456 conn->local_sockaddr = cm_route->addr.src_addr; 2457 } 2458 2459 static int 2460 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 2461 { 2462 struct isert_np *isert_np = np->np_context; 2463 struct isert_conn *isert_conn; 2464 int ret; 2465 2466 accept_wait: 2467 ret = down_interruptible(&isert_np->sem); 2468 if (ret) 2469 return -ENODEV; 2470 2471 spin_lock_bh(&np->np_thread_lock); 2472 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { 2473 spin_unlock_bh(&np->np_thread_lock); 2474 isert_dbg("np_thread_state %d\n", 2475 np->np_thread_state); 2476 /** 2477 * No point in stalling here when np_thread 2478 * is in state RESET/SHUTDOWN/EXIT - bail 2479 **/ 2480 return -ENODEV; 2481 } 2482 spin_unlock_bh(&np->np_thread_lock); 2483 2484 mutex_lock(&isert_np->mutex); 2485 if (list_empty(&isert_np->pending)) { 2486 mutex_unlock(&isert_np->mutex); 2487 goto accept_wait; 2488 } 2489 isert_conn = list_first_entry(&isert_np->pending, 2490 struct isert_conn, node); 2491 list_del_init(&isert_conn->node); 2492 mutex_unlock(&isert_np->mutex); 2493 2494 conn->context = isert_conn; 2495 isert_conn->conn = conn; 2496 isert_conn->state = ISER_CONN_BOUND; 2497 2498 isert_set_conn_info(np, conn, isert_conn); 2499 2500 isert_dbg("Processing isert_conn: %p\n", isert_conn); 2501 2502 return 0; 2503 } 2504 2505 static void 2506 isert_free_np(struct iscsi_np *np) 2507 { 2508 struct isert_np *isert_np = np->np_context; 2509 struct isert_conn *isert_conn, *n; 2510 2511 if (isert_np->cm_id) 2512 rdma_destroy_id(isert_np->cm_id); 2513 2514 /* 2515 * FIXME: At this point we don't have a good way to insure 2516 * that at this point we don't have hanging connections that 2517 * completed RDMA establishment but didn't start iscsi login 2518 * process. So work-around this by cleaning up what ever piled 2519 * up in accepted and pending lists. 2520 */ 2521 mutex_lock(&isert_np->mutex); 2522 if (!list_empty(&isert_np->pending)) { 2523 isert_info("Still have isert pending connections\n"); 2524 list_for_each_entry_safe(isert_conn, n, 2525 &isert_np->pending, 2526 node) { 2527 isert_info("cleaning isert_conn %p state (%d)\n", 2528 isert_conn, isert_conn->state); 2529 isert_connect_release(isert_conn); 2530 } 2531 } 2532 2533 if (!list_empty(&isert_np->accepted)) { 2534 isert_info("Still have isert accepted connections\n"); 2535 list_for_each_entry_safe(isert_conn, n, 2536 &isert_np->accepted, 2537 node) { 2538 isert_info("cleaning isert_conn %p state (%d)\n", 2539 isert_conn, isert_conn->state); 2540 isert_connect_release(isert_conn); 2541 } 2542 } 2543 mutex_unlock(&isert_np->mutex); 2544 2545 np->np_context = NULL; 2546 kfree(isert_np); 2547 } 2548 2549 static void isert_release_work(struct work_struct *work) 2550 { 2551 struct isert_conn *isert_conn = container_of(work, 2552 struct isert_conn, 2553 release_work); 2554 2555 isert_info("Starting release conn %p\n", isert_conn); 2556 2557 mutex_lock(&isert_conn->mutex); 2558 isert_conn->state = ISER_CONN_DOWN; 2559 mutex_unlock(&isert_conn->mutex); 2560 2561 isert_info("Destroying conn %p\n", isert_conn); 2562 isert_put_conn(isert_conn); 2563 } 2564 2565 static void 2566 isert_wait4logout(struct isert_conn *isert_conn) 2567 { 2568 struct iscsi_conn *conn = isert_conn->conn; 2569 2570 isert_info("conn %p\n", isert_conn); 2571 2572 if (isert_conn->logout_posted) { 2573 isert_info("conn %p wait for conn_logout_comp\n", isert_conn); 2574 wait_for_completion_timeout(&conn->conn_logout_comp, 2575 SECONDS_FOR_LOGOUT_COMP * HZ); 2576 } 2577 } 2578 2579 static void 2580 isert_wait4cmds(struct iscsi_conn *conn) 2581 { 2582 isert_info("iscsi_conn %p\n", conn); 2583 2584 if (conn->sess) { 2585 target_sess_cmd_list_set_waiting(conn->sess->se_sess); 2586 target_wait_for_sess_cmds(conn->sess->se_sess); 2587 } 2588 } 2589 2590 /** 2591 * isert_put_unsol_pending_cmds() - Drop commands waiting for 2592 * unsolicitate dataout 2593 * @conn: iscsi connection 2594 * 2595 * We might still have commands that are waiting for unsolicited 2596 * dataouts messages. We must put the extra reference on those 2597 * before blocking on the target_wait_for_session_cmds 2598 */ 2599 static void 2600 isert_put_unsol_pending_cmds(struct iscsi_conn *conn) 2601 { 2602 struct iscsi_cmd *cmd, *tmp; 2603 static LIST_HEAD(drop_cmd_list); 2604 2605 spin_lock_bh(&conn->cmd_lock); 2606 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) { 2607 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) && 2608 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) && 2609 (cmd->write_data_done < cmd->se_cmd.data_length)) 2610 list_move_tail(&cmd->i_conn_node, &drop_cmd_list); 2611 } 2612 spin_unlock_bh(&conn->cmd_lock); 2613 2614 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) { 2615 list_del_init(&cmd->i_conn_node); 2616 if (cmd->i_state != ISTATE_REMOVE) { 2617 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2618 2619 isert_info("conn %p dropping cmd %p\n", conn, cmd); 2620 isert_put_cmd(isert_cmd, true); 2621 } 2622 } 2623 } 2624 2625 static void isert_wait_conn(struct iscsi_conn *conn) 2626 { 2627 struct isert_conn *isert_conn = conn->context; 2628 2629 isert_info("Starting conn %p\n", isert_conn); 2630 2631 mutex_lock(&isert_conn->mutex); 2632 isert_conn_terminate(isert_conn); 2633 mutex_unlock(&isert_conn->mutex); 2634 2635 ib_drain_qp(isert_conn->qp); 2636 isert_put_unsol_pending_cmds(conn); 2637 isert_wait4cmds(conn); 2638 isert_wait4logout(isert_conn); 2639 2640 queue_work(isert_release_wq, &isert_conn->release_work); 2641 } 2642 2643 static void isert_free_conn(struct iscsi_conn *conn) 2644 { 2645 struct isert_conn *isert_conn = conn->context; 2646 2647 ib_drain_qp(isert_conn->qp); 2648 isert_put_conn(isert_conn); 2649 } 2650 2651 static void isert_get_rx_pdu(struct iscsi_conn *conn) 2652 { 2653 struct completion comp; 2654 2655 init_completion(&comp); 2656 2657 wait_for_completion_interruptible(&comp); 2658 } 2659 2660 static struct iscsit_transport iser_target_transport = { 2661 .name = "IB/iSER", 2662 .transport_type = ISCSI_INFINIBAND, 2663 .rdma_shutdown = true, 2664 .priv_size = sizeof(struct isert_cmd), 2665 .owner = THIS_MODULE, 2666 .iscsit_setup_np = isert_setup_np, 2667 .iscsit_accept_np = isert_accept_np, 2668 .iscsit_free_np = isert_free_np, 2669 .iscsit_wait_conn = isert_wait_conn, 2670 .iscsit_free_conn = isert_free_conn, 2671 .iscsit_get_login_rx = isert_get_login_rx, 2672 .iscsit_put_login_tx = isert_put_login_tx, 2673 .iscsit_immediate_queue = isert_immediate_queue, 2674 .iscsit_response_queue = isert_response_queue, 2675 .iscsit_get_dataout = isert_get_dataout, 2676 .iscsit_queue_data_in = isert_put_datain, 2677 .iscsit_queue_status = isert_put_response, 2678 .iscsit_aborted_task = isert_aborted_task, 2679 .iscsit_get_rx_pdu = isert_get_rx_pdu, 2680 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, 2681 }; 2682 2683 static int __init isert_init(void) 2684 { 2685 int ret; 2686 2687 isert_comp_wq = alloc_workqueue("isert_comp_wq", 2688 WQ_UNBOUND | WQ_HIGHPRI, 0); 2689 if (!isert_comp_wq) { 2690 isert_err("Unable to allocate isert_comp_wq\n"); 2691 return -ENOMEM; 2692 } 2693 2694 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, 2695 WQ_UNBOUND_MAX_ACTIVE); 2696 if (!isert_release_wq) { 2697 isert_err("Unable to allocate isert_release_wq\n"); 2698 ret = -ENOMEM; 2699 goto destroy_comp_wq; 2700 } 2701 2702 iscsit_register_transport(&iser_target_transport); 2703 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); 2704 2705 return 0; 2706 2707 destroy_comp_wq: 2708 destroy_workqueue(isert_comp_wq); 2709 2710 return ret; 2711 } 2712 2713 static void __exit isert_exit(void) 2714 { 2715 flush_scheduled_work(); 2716 destroy_workqueue(isert_release_wq); 2717 destroy_workqueue(isert_comp_wq); 2718 iscsit_unregister_transport(&iser_target_transport); 2719 isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); 2720 } 2721 2722 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); 2723 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 2724 MODULE_LICENSE("GPL"); 2725 2726 module_init(isert_init); 2727 module_exit(isert_exit); 2728