1 /******************************************************************************* 2 * This file contains iSCSI extentions for RDMA (iSER) Verbs 3 * 4 * (c) Copyright 2013 Datera, Inc. 5 * 6 * Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ****************************************************************************/ 18 19 #include <linux/string.h> 20 #include <linux/module.h> 21 #include <linux/scatterlist.h> 22 #include <linux/socket.h> 23 #include <linux/in.h> 24 #include <linux/in6.h> 25 #include <rdma/ib_verbs.h> 26 #include <rdma/rdma_cm.h> 27 #include <target/target_core_base.h> 28 #include <target/target_core_fabric.h> 29 #include <target/iscsi/iscsi_transport.h> 30 #include <linux/semaphore.h> 31 32 #include "ib_isert.h" 33 34 #define ISERT_MAX_CONN 8 35 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) 36 #define ISER_MAX_TX_CQ_LEN \ 37 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN) 38 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \ 39 ISERT_MAX_CONN) 40 41 static int isert_debug_level; 42 module_param_named(debug_level, isert_debug_level, int, 0644); 43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)"); 44 45 static DEFINE_MUTEX(device_list_mutex); 46 static LIST_HEAD(device_list); 47 static struct workqueue_struct *isert_comp_wq; 48 static struct workqueue_struct *isert_release_wq; 49 50 static int 51 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); 52 static int 53 isert_login_post_recv(struct isert_conn *isert_conn); 54 static int 55 isert_rdma_accept(struct isert_conn *isert_conn); 56 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); 57 58 static void isert_release_work(struct work_struct *work); 59 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc); 60 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc); 61 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc); 62 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc); 63 64 static inline bool 65 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) 66 { 67 return (conn->pi_support && 68 cmd->prot_op != TARGET_PROT_NORMAL); 69 } 70 71 72 static void 73 isert_qp_event_callback(struct ib_event *e, void *context) 74 { 75 struct isert_conn *isert_conn = context; 76 77 isert_err("%s (%d): conn %p\n", 78 ib_event_msg(e->event), e->event, isert_conn); 79 80 switch (e->event) { 81 case IB_EVENT_COMM_EST: 82 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); 83 break; 84 case IB_EVENT_QP_LAST_WQE_REACHED: 85 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); 86 break; 87 default: 88 break; 89 } 90 } 91 92 static struct isert_comp * 93 isert_comp_get(struct isert_conn *isert_conn) 94 { 95 struct isert_device *device = isert_conn->device; 96 struct isert_comp *comp; 97 int i, min = 0; 98 99 mutex_lock(&device_list_mutex); 100 for (i = 0; i < device->comps_used; i++) 101 if (device->comps[i].active_qps < 102 device->comps[min].active_qps) 103 min = i; 104 comp = &device->comps[min]; 105 comp->active_qps++; 106 mutex_unlock(&device_list_mutex); 107 108 isert_info("conn %p, using comp %p min_index: %d\n", 109 isert_conn, comp, min); 110 111 return comp; 112 } 113 114 static void 115 isert_comp_put(struct isert_comp *comp) 116 { 117 mutex_lock(&device_list_mutex); 118 comp->active_qps--; 119 mutex_unlock(&device_list_mutex); 120 } 121 122 static struct ib_qp * 123 isert_create_qp(struct isert_conn *isert_conn, 124 struct isert_comp *comp, 125 struct rdma_cm_id *cma_id) 126 { 127 struct isert_device *device = isert_conn->device; 128 struct ib_qp_init_attr attr; 129 int ret; 130 131 memset(&attr, 0, sizeof(struct ib_qp_init_attr)); 132 attr.event_handler = isert_qp_event_callback; 133 attr.qp_context = isert_conn; 134 attr.send_cq = comp->cq; 135 attr.recv_cq = comp->cq; 136 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1; 137 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; 138 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX; 139 attr.cap.max_send_sge = device->ib_device->attrs.max_sge; 140 attr.cap.max_recv_sge = 1; 141 attr.sq_sig_type = IB_SIGNAL_REQ_WR; 142 attr.qp_type = IB_QPT_RC; 143 if (device->pi_capable) 144 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; 145 146 ret = rdma_create_qp(cma_id, device->pd, &attr); 147 if (ret) { 148 isert_err("rdma_create_qp failed for cma_id %d\n", ret); 149 return ERR_PTR(ret); 150 } 151 152 return cma_id->qp; 153 } 154 155 static int 156 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) 157 { 158 struct isert_comp *comp; 159 int ret; 160 161 comp = isert_comp_get(isert_conn); 162 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id); 163 if (IS_ERR(isert_conn->qp)) { 164 ret = PTR_ERR(isert_conn->qp); 165 goto err; 166 } 167 168 return 0; 169 err: 170 isert_comp_put(comp); 171 return ret; 172 } 173 174 static int 175 isert_alloc_rx_descriptors(struct isert_conn *isert_conn) 176 { 177 struct isert_device *device = isert_conn->device; 178 struct ib_device *ib_dev = device->ib_device; 179 struct iser_rx_desc *rx_desc; 180 struct ib_sge *rx_sg; 181 u64 dma_addr; 182 int i, j; 183 184 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS * 185 sizeof(struct iser_rx_desc), GFP_KERNEL); 186 if (!isert_conn->rx_descs) 187 goto fail; 188 189 rx_desc = isert_conn->rx_descs; 190 191 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 192 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc, 193 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 194 if (ib_dma_mapping_error(ib_dev, dma_addr)) 195 goto dma_map_fail; 196 197 rx_desc->dma_addr = dma_addr; 198 199 rx_sg = &rx_desc->rx_sg; 200 rx_sg->addr = rx_desc->dma_addr; 201 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 202 rx_sg->lkey = device->pd->local_dma_lkey; 203 rx_desc->rx_cqe.done = isert_recv_done; 204 } 205 206 return 0; 207 208 dma_map_fail: 209 rx_desc = isert_conn->rx_descs; 210 for (j = 0; j < i; j++, rx_desc++) { 211 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 212 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 213 } 214 kfree(isert_conn->rx_descs); 215 isert_conn->rx_descs = NULL; 216 fail: 217 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); 218 219 return -ENOMEM; 220 } 221 222 static void 223 isert_free_rx_descriptors(struct isert_conn *isert_conn) 224 { 225 struct ib_device *ib_dev = isert_conn->device->ib_device; 226 struct iser_rx_desc *rx_desc; 227 int i; 228 229 if (!isert_conn->rx_descs) 230 return; 231 232 rx_desc = isert_conn->rx_descs; 233 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 234 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 235 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 236 } 237 238 kfree(isert_conn->rx_descs); 239 isert_conn->rx_descs = NULL; 240 } 241 242 static void 243 isert_free_comps(struct isert_device *device) 244 { 245 int i; 246 247 for (i = 0; i < device->comps_used; i++) { 248 struct isert_comp *comp = &device->comps[i]; 249 250 if (comp->cq) 251 ib_free_cq(comp->cq); 252 } 253 kfree(device->comps); 254 } 255 256 static int 257 isert_alloc_comps(struct isert_device *device) 258 { 259 int i, max_cqe, ret = 0; 260 261 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(), 262 device->ib_device->num_comp_vectors)); 263 264 isert_info("Using %d CQs, %s supports %d vectors support " 265 "pi_capable %d\n", 266 device->comps_used, device->ib_device->name, 267 device->ib_device->num_comp_vectors, 268 device->pi_capable); 269 270 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), 271 GFP_KERNEL); 272 if (!device->comps) { 273 isert_err("Unable to allocate completion contexts\n"); 274 return -ENOMEM; 275 } 276 277 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe); 278 279 for (i = 0; i < device->comps_used; i++) { 280 struct isert_comp *comp = &device->comps[i]; 281 282 comp->device = device; 283 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i, 284 IB_POLL_WORKQUEUE); 285 if (IS_ERR(comp->cq)) { 286 isert_err("Unable to allocate cq\n"); 287 ret = PTR_ERR(comp->cq); 288 comp->cq = NULL; 289 goto out_cq; 290 } 291 } 292 293 return 0; 294 out_cq: 295 isert_free_comps(device); 296 return ret; 297 } 298 299 static int 300 isert_create_device_ib_res(struct isert_device *device) 301 { 302 struct ib_device *ib_dev = device->ib_device; 303 int ret; 304 305 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge); 306 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd); 307 308 ret = isert_alloc_comps(device); 309 if (ret) 310 goto out; 311 312 device->pd = ib_alloc_pd(ib_dev); 313 if (IS_ERR(device->pd)) { 314 ret = PTR_ERR(device->pd); 315 isert_err("failed to allocate pd, device %p, ret=%d\n", 316 device, ret); 317 goto out_cq; 318 } 319 320 /* Check signature cap */ 321 device->pi_capable = ib_dev->attrs.device_cap_flags & 322 IB_DEVICE_SIGNATURE_HANDOVER ? true : false; 323 324 return 0; 325 326 out_cq: 327 isert_free_comps(device); 328 out: 329 if (ret > 0) 330 ret = -EINVAL; 331 return ret; 332 } 333 334 static void 335 isert_free_device_ib_res(struct isert_device *device) 336 { 337 isert_info("device %p\n", device); 338 339 ib_dealloc_pd(device->pd); 340 isert_free_comps(device); 341 } 342 343 static void 344 isert_device_put(struct isert_device *device) 345 { 346 mutex_lock(&device_list_mutex); 347 device->refcount--; 348 isert_info("device %p refcount %d\n", device, device->refcount); 349 if (!device->refcount) { 350 isert_free_device_ib_res(device); 351 list_del(&device->dev_node); 352 kfree(device); 353 } 354 mutex_unlock(&device_list_mutex); 355 } 356 357 static struct isert_device * 358 isert_device_get(struct rdma_cm_id *cma_id) 359 { 360 struct isert_device *device; 361 int ret; 362 363 mutex_lock(&device_list_mutex); 364 list_for_each_entry(device, &device_list, dev_node) { 365 if (device->ib_device->node_guid == cma_id->device->node_guid) { 366 device->refcount++; 367 isert_info("Found iser device %p refcount %d\n", 368 device, device->refcount); 369 mutex_unlock(&device_list_mutex); 370 return device; 371 } 372 } 373 374 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); 375 if (!device) { 376 mutex_unlock(&device_list_mutex); 377 return ERR_PTR(-ENOMEM); 378 } 379 380 INIT_LIST_HEAD(&device->dev_node); 381 382 device->ib_device = cma_id->device; 383 ret = isert_create_device_ib_res(device); 384 if (ret) { 385 kfree(device); 386 mutex_unlock(&device_list_mutex); 387 return ERR_PTR(ret); 388 } 389 390 device->refcount++; 391 list_add_tail(&device->dev_node, &device_list); 392 isert_info("Created a new iser device %p refcount %d\n", 393 device, device->refcount); 394 mutex_unlock(&device_list_mutex); 395 396 return device; 397 } 398 399 static void 400 isert_init_conn(struct isert_conn *isert_conn) 401 { 402 isert_conn->state = ISER_CONN_INIT; 403 INIT_LIST_HEAD(&isert_conn->node); 404 init_completion(&isert_conn->login_comp); 405 init_completion(&isert_conn->login_req_comp); 406 kref_init(&isert_conn->kref); 407 mutex_init(&isert_conn->mutex); 408 INIT_WORK(&isert_conn->release_work, isert_release_work); 409 } 410 411 static void 412 isert_free_login_buf(struct isert_conn *isert_conn) 413 { 414 struct ib_device *ib_dev = isert_conn->device->ib_device; 415 416 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, 417 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); 418 kfree(isert_conn->login_rsp_buf); 419 420 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 421 ISER_RX_PAYLOAD_SIZE, 422 DMA_FROM_DEVICE); 423 kfree(isert_conn->login_req_buf); 424 } 425 426 static int 427 isert_alloc_login_buf(struct isert_conn *isert_conn, 428 struct ib_device *ib_dev) 429 { 430 int ret; 431 432 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf), 433 GFP_KERNEL); 434 if (!isert_conn->login_req_buf) { 435 isert_err("Unable to allocate isert_conn->login_buf\n"); 436 return -ENOMEM; 437 } 438 439 isert_conn->login_req_dma = ib_dma_map_single(ib_dev, 440 isert_conn->login_req_buf, 441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 442 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); 443 if (ret) { 444 isert_err("login_req_dma mapping error: %d\n", ret); 445 isert_conn->login_req_dma = 0; 446 goto out_free_login_req_buf; 447 } 448 449 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL); 450 if (!isert_conn->login_rsp_buf) { 451 isert_err("Unable to allocate isert_conn->login_rspbuf\n"); 452 goto out_unmap_login_req_buf; 453 } 454 455 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, 456 isert_conn->login_rsp_buf, 457 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE); 458 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); 459 if (ret) { 460 isert_err("login_rsp_dma mapping error: %d\n", ret); 461 isert_conn->login_rsp_dma = 0; 462 goto out_free_login_rsp_buf; 463 } 464 465 return 0; 466 467 out_free_login_rsp_buf: 468 kfree(isert_conn->login_rsp_buf); 469 out_unmap_login_req_buf: 470 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 471 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 472 out_free_login_req_buf: 473 kfree(isert_conn->login_req_buf); 474 return ret; 475 } 476 477 static void 478 isert_set_nego_params(struct isert_conn *isert_conn, 479 struct rdma_conn_param *param) 480 { 481 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs; 482 483 /* Set max inflight RDMA READ requests */ 484 isert_conn->initiator_depth = min_t(u8, param->initiator_depth, 485 attr->max_qp_init_rd_atom); 486 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); 487 488 if (param->private_data) { 489 u8 flags = *(u8 *)param->private_data; 490 491 /* 492 * use remote invalidation if the both initiator 493 * and the HCA support it 494 */ 495 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) && 496 (attr->device_cap_flags & 497 IB_DEVICE_MEM_MGT_EXTENSIONS); 498 if (isert_conn->snd_w_inv) 499 isert_info("Using remote invalidation\n"); 500 } 501 } 502 503 static int 504 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 505 { 506 struct isert_np *isert_np = cma_id->context; 507 struct iscsi_np *np = isert_np->np; 508 struct isert_conn *isert_conn; 509 struct isert_device *device; 510 int ret = 0; 511 512 spin_lock_bh(&np->np_thread_lock); 513 if (!np->enabled) { 514 spin_unlock_bh(&np->np_thread_lock); 515 isert_dbg("iscsi_np is not enabled, reject connect request\n"); 516 return rdma_reject(cma_id, NULL, 0); 517 } 518 spin_unlock_bh(&np->np_thread_lock); 519 520 isert_dbg("cma_id: %p, portal: %p\n", 521 cma_id, cma_id->context); 522 523 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); 524 if (!isert_conn) 525 return -ENOMEM; 526 527 isert_init_conn(isert_conn); 528 isert_conn->cm_id = cma_id; 529 530 ret = isert_alloc_login_buf(isert_conn, cma_id->device); 531 if (ret) 532 goto out; 533 534 device = isert_device_get(cma_id); 535 if (IS_ERR(device)) { 536 ret = PTR_ERR(device); 537 goto out_rsp_dma_map; 538 } 539 isert_conn->device = device; 540 541 isert_set_nego_params(isert_conn, &event->param.conn); 542 543 ret = isert_conn_setup_qp(isert_conn, cma_id); 544 if (ret) 545 goto out_conn_dev; 546 547 ret = isert_login_post_recv(isert_conn); 548 if (ret) 549 goto out_conn_dev; 550 551 ret = isert_rdma_accept(isert_conn); 552 if (ret) 553 goto out_conn_dev; 554 555 mutex_lock(&isert_np->mutex); 556 list_add_tail(&isert_conn->node, &isert_np->accepted); 557 mutex_unlock(&isert_np->mutex); 558 559 return 0; 560 561 out_conn_dev: 562 isert_device_put(device); 563 out_rsp_dma_map: 564 isert_free_login_buf(isert_conn); 565 out: 566 kfree(isert_conn); 567 rdma_reject(cma_id, NULL, 0); 568 return ret; 569 } 570 571 static void 572 isert_connect_release(struct isert_conn *isert_conn) 573 { 574 struct isert_device *device = isert_conn->device; 575 576 isert_dbg("conn %p\n", isert_conn); 577 578 BUG_ON(!device); 579 580 isert_free_rx_descriptors(isert_conn); 581 if (isert_conn->cm_id) 582 rdma_destroy_id(isert_conn->cm_id); 583 584 if (isert_conn->qp) { 585 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; 586 587 isert_comp_put(comp); 588 ib_destroy_qp(isert_conn->qp); 589 } 590 591 if (isert_conn->login_req_buf) 592 isert_free_login_buf(isert_conn); 593 594 isert_device_put(device); 595 596 kfree(isert_conn); 597 } 598 599 static void 600 isert_connected_handler(struct rdma_cm_id *cma_id) 601 { 602 struct isert_conn *isert_conn = cma_id->qp->qp_context; 603 struct isert_np *isert_np = cma_id->context; 604 605 isert_info("conn %p\n", isert_conn); 606 607 mutex_lock(&isert_conn->mutex); 608 isert_conn->state = ISER_CONN_UP; 609 kref_get(&isert_conn->kref); 610 mutex_unlock(&isert_conn->mutex); 611 612 mutex_lock(&isert_np->mutex); 613 list_move_tail(&isert_conn->node, &isert_np->pending); 614 mutex_unlock(&isert_np->mutex); 615 616 isert_info("np %p: Allow accept_np to continue\n", isert_np); 617 up(&isert_np->sem); 618 } 619 620 static void 621 isert_release_kref(struct kref *kref) 622 { 623 struct isert_conn *isert_conn = container_of(kref, 624 struct isert_conn, kref); 625 626 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, 627 current->pid); 628 629 isert_connect_release(isert_conn); 630 } 631 632 static void 633 isert_put_conn(struct isert_conn *isert_conn) 634 { 635 kref_put(&isert_conn->kref, isert_release_kref); 636 } 637 638 static void 639 isert_handle_unbound_conn(struct isert_conn *isert_conn) 640 { 641 struct isert_np *isert_np = isert_conn->cm_id->context; 642 643 mutex_lock(&isert_np->mutex); 644 if (!list_empty(&isert_conn->node)) { 645 /* 646 * This means iscsi doesn't know this connection 647 * so schedule a cleanup ourselves 648 */ 649 list_del_init(&isert_conn->node); 650 isert_put_conn(isert_conn); 651 queue_work(isert_release_wq, &isert_conn->release_work); 652 } 653 mutex_unlock(&isert_np->mutex); 654 } 655 656 /** 657 * isert_conn_terminate() - Initiate connection termination 658 * @isert_conn: isert connection struct 659 * 660 * Notes: 661 * In case the connection state is BOUND, move state 662 * to TEMINATING and start teardown sequence (rdma_disconnect). 663 * In case the connection state is UP, complete flush as well. 664 * 665 * This routine must be called with mutex held. Thus it is 666 * safe to call multiple times. 667 */ 668 static void 669 isert_conn_terminate(struct isert_conn *isert_conn) 670 { 671 int err; 672 673 if (isert_conn->state >= ISER_CONN_TERMINATING) 674 return; 675 676 isert_info("Terminating conn %p state %d\n", 677 isert_conn, isert_conn->state); 678 isert_conn->state = ISER_CONN_TERMINATING; 679 err = rdma_disconnect(isert_conn->cm_id); 680 if (err) 681 isert_warn("Failed rdma_disconnect isert_conn %p\n", 682 isert_conn); 683 } 684 685 static int 686 isert_np_cma_handler(struct isert_np *isert_np, 687 enum rdma_cm_event_type event) 688 { 689 isert_dbg("%s (%d): isert np %p\n", 690 rdma_event_msg(event), event, isert_np); 691 692 switch (event) { 693 case RDMA_CM_EVENT_DEVICE_REMOVAL: 694 isert_np->cm_id = NULL; 695 break; 696 case RDMA_CM_EVENT_ADDR_CHANGE: 697 isert_np->cm_id = isert_setup_id(isert_np); 698 if (IS_ERR(isert_np->cm_id)) { 699 isert_err("isert np %p setup id failed: %ld\n", 700 isert_np, PTR_ERR(isert_np->cm_id)); 701 isert_np->cm_id = NULL; 702 } 703 break; 704 default: 705 isert_err("isert np %p Unexpected event %d\n", 706 isert_np, event); 707 } 708 709 return -1; 710 } 711 712 static int 713 isert_disconnected_handler(struct rdma_cm_id *cma_id, 714 enum rdma_cm_event_type event) 715 { 716 struct isert_conn *isert_conn = cma_id->qp->qp_context; 717 718 mutex_lock(&isert_conn->mutex); 719 switch (isert_conn->state) { 720 case ISER_CONN_TERMINATING: 721 break; 722 case ISER_CONN_UP: 723 isert_conn_terminate(isert_conn); 724 ib_drain_qp(isert_conn->qp); 725 isert_handle_unbound_conn(isert_conn); 726 break; 727 case ISER_CONN_BOUND: 728 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ 729 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 730 break; 731 default: 732 isert_warn("conn %p teminating in state %d\n", 733 isert_conn, isert_conn->state); 734 } 735 mutex_unlock(&isert_conn->mutex); 736 737 return 0; 738 } 739 740 static int 741 isert_connect_error(struct rdma_cm_id *cma_id) 742 { 743 struct isert_conn *isert_conn = cma_id->qp->qp_context; 744 745 list_del_init(&isert_conn->node); 746 isert_conn->cm_id = NULL; 747 isert_put_conn(isert_conn); 748 749 return -1; 750 } 751 752 static int 753 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 754 { 755 struct isert_np *isert_np = cma_id->context; 756 int ret = 0; 757 758 isert_info("%s (%d): status %d id %p np %p\n", 759 rdma_event_msg(event->event), event->event, 760 event->status, cma_id, cma_id->context); 761 762 if (isert_np->cm_id == cma_id) 763 return isert_np_cma_handler(cma_id->context, event->event); 764 765 switch (event->event) { 766 case RDMA_CM_EVENT_CONNECT_REQUEST: 767 ret = isert_connect_request(cma_id, event); 768 if (ret) 769 isert_err("failed handle connect request %d\n", ret); 770 break; 771 case RDMA_CM_EVENT_ESTABLISHED: 772 isert_connected_handler(cma_id); 773 break; 774 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ 775 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ 776 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */ 777 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ 778 ret = isert_disconnected_handler(cma_id, event->event); 779 break; 780 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ 781 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ 782 case RDMA_CM_EVENT_CONNECT_ERROR: 783 ret = isert_connect_error(cma_id); 784 break; 785 default: 786 isert_err("Unhandled RDMA CMA event: %d\n", event->event); 787 break; 788 } 789 790 return ret; 791 } 792 793 static int 794 isert_post_recvm(struct isert_conn *isert_conn, u32 count) 795 { 796 struct ib_recv_wr *rx_wr, *rx_wr_failed; 797 int i, ret; 798 struct iser_rx_desc *rx_desc; 799 800 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 801 rx_desc = &isert_conn->rx_descs[i]; 802 803 rx_wr->wr_cqe = &rx_desc->rx_cqe; 804 rx_wr->sg_list = &rx_desc->rx_sg; 805 rx_wr->num_sge = 1; 806 rx_wr->next = rx_wr + 1; 807 } 808 rx_wr--; 809 rx_wr->next = NULL; /* mark end of work requests list */ 810 811 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, 812 &rx_wr_failed); 813 if (ret) 814 isert_err("ib_post_recv() failed with ret: %d\n", ret); 815 816 return ret; 817 } 818 819 static int 820 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc) 821 { 822 struct ib_recv_wr *rx_wr_failed, rx_wr; 823 int ret; 824 825 rx_wr.wr_cqe = &rx_desc->rx_cqe; 826 rx_wr.sg_list = &rx_desc->rx_sg; 827 rx_wr.num_sge = 1; 828 rx_wr.next = NULL; 829 830 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed); 831 if (ret) 832 isert_err("ib_post_recv() failed with ret: %d\n", ret); 833 834 return ret; 835 } 836 837 static int 838 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) 839 { 840 struct ib_device *ib_dev = isert_conn->cm_id->device; 841 struct ib_send_wr send_wr, *send_wr_failed; 842 int ret; 843 844 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, 845 ISER_HEADERS_LEN, DMA_TO_DEVICE); 846 847 tx_desc->tx_cqe.done = isert_login_send_done; 848 849 send_wr.next = NULL; 850 send_wr.wr_cqe = &tx_desc->tx_cqe; 851 send_wr.sg_list = tx_desc->tx_sg; 852 send_wr.num_sge = tx_desc->num_sge; 853 send_wr.opcode = IB_WR_SEND; 854 send_wr.send_flags = IB_SEND_SIGNALED; 855 856 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed); 857 if (ret) 858 isert_err("ib_post_send() failed, ret: %d\n", ret); 859 860 return ret; 861 } 862 863 static void 864 isert_create_send_desc(struct isert_conn *isert_conn, 865 struct isert_cmd *isert_cmd, 866 struct iser_tx_desc *tx_desc) 867 { 868 struct isert_device *device = isert_conn->device; 869 struct ib_device *ib_dev = device->ib_device; 870 871 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, 872 ISER_HEADERS_LEN, DMA_TO_DEVICE); 873 874 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); 875 tx_desc->iser_header.flags = ISCSI_CTRL; 876 877 tx_desc->num_sge = 1; 878 879 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) { 880 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 881 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); 882 } 883 } 884 885 static int 886 isert_init_tx_hdrs(struct isert_conn *isert_conn, 887 struct iser_tx_desc *tx_desc) 888 { 889 struct isert_device *device = isert_conn->device; 890 struct ib_device *ib_dev = device->ib_device; 891 u64 dma_addr; 892 893 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, 894 ISER_HEADERS_LEN, DMA_TO_DEVICE); 895 if (ib_dma_mapping_error(ib_dev, dma_addr)) { 896 isert_err("ib_dma_mapping_error() failed\n"); 897 return -ENOMEM; 898 } 899 900 tx_desc->dma_addr = dma_addr; 901 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 902 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 903 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 904 905 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", 906 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, 907 tx_desc->tx_sg[0].lkey); 908 909 return 0; 910 } 911 912 static void 913 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 914 struct ib_send_wr *send_wr) 915 { 916 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; 917 918 tx_desc->tx_cqe.done = isert_send_done; 919 send_wr->wr_cqe = &tx_desc->tx_cqe; 920 921 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) { 922 send_wr->opcode = IB_WR_SEND_WITH_INV; 923 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey; 924 } else { 925 send_wr->opcode = IB_WR_SEND; 926 } 927 928 send_wr->sg_list = &tx_desc->tx_sg[0]; 929 send_wr->num_sge = isert_cmd->tx_desc.num_sge; 930 send_wr->send_flags = IB_SEND_SIGNALED; 931 } 932 933 static int 934 isert_login_post_recv(struct isert_conn *isert_conn) 935 { 936 struct ib_recv_wr rx_wr, *rx_wr_fail; 937 struct ib_sge sge; 938 int ret; 939 940 memset(&sge, 0, sizeof(struct ib_sge)); 941 sge.addr = isert_conn->login_req_dma; 942 sge.length = ISER_RX_PAYLOAD_SIZE; 943 sge.lkey = isert_conn->device->pd->local_dma_lkey; 944 945 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", 946 sge.addr, sge.length, sge.lkey); 947 948 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done; 949 950 memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); 951 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe; 952 rx_wr.sg_list = &sge; 953 rx_wr.num_sge = 1; 954 955 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail); 956 if (ret) 957 isert_err("ib_post_recv() failed: %d\n", ret); 958 959 return ret; 960 } 961 962 static int 963 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 964 u32 length) 965 { 966 struct isert_conn *isert_conn = conn->context; 967 struct isert_device *device = isert_conn->device; 968 struct ib_device *ib_dev = device->ib_device; 969 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; 970 int ret; 971 972 isert_create_send_desc(isert_conn, NULL, tx_desc); 973 974 memcpy(&tx_desc->iscsi_header, &login->rsp[0], 975 sizeof(struct iscsi_hdr)); 976 977 isert_init_tx_hdrs(isert_conn, tx_desc); 978 979 if (length > 0) { 980 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; 981 982 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, 983 length, DMA_TO_DEVICE); 984 985 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); 986 987 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, 988 length, DMA_TO_DEVICE); 989 990 tx_dsg->addr = isert_conn->login_rsp_dma; 991 tx_dsg->length = length; 992 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey; 993 tx_desc->num_sge = 2; 994 } 995 if (!login->login_failed) { 996 if (login->login_complete) { 997 ret = isert_alloc_rx_descriptors(isert_conn); 998 if (ret) 999 return ret; 1000 1001 ret = isert_post_recvm(isert_conn, 1002 ISERT_QP_MAX_RECV_DTOS); 1003 if (ret) 1004 return ret; 1005 1006 /* Now we are in FULL_FEATURE phase */ 1007 mutex_lock(&isert_conn->mutex); 1008 isert_conn->state = ISER_CONN_FULL_FEATURE; 1009 mutex_unlock(&isert_conn->mutex); 1010 goto post_send; 1011 } 1012 1013 ret = isert_login_post_recv(isert_conn); 1014 if (ret) 1015 return ret; 1016 } 1017 post_send: 1018 ret = isert_login_post_send(isert_conn, tx_desc); 1019 if (ret) 1020 return ret; 1021 1022 return 0; 1023 } 1024 1025 static void 1026 isert_rx_login_req(struct isert_conn *isert_conn) 1027 { 1028 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf; 1029 int rx_buflen = isert_conn->login_req_len; 1030 struct iscsi_conn *conn = isert_conn->conn; 1031 struct iscsi_login *login = conn->conn_login; 1032 int size; 1033 1034 isert_info("conn %p\n", isert_conn); 1035 1036 WARN_ON_ONCE(!login); 1037 1038 if (login->first_request) { 1039 struct iscsi_login_req *login_req = 1040 (struct iscsi_login_req *)&rx_desc->iscsi_header; 1041 /* 1042 * Setup the initial iscsi_login values from the leading 1043 * login request PDU. 1044 */ 1045 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1046 login->current_stage = 1047 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 1048 >> 2; 1049 login->version_min = login_req->min_version; 1050 login->version_max = login_req->max_version; 1051 memcpy(login->isid, login_req->isid, 6); 1052 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1053 login->init_task_tag = login_req->itt; 1054 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1055 login->cid = be16_to_cpu(login_req->cid); 1056 login->tsih = be16_to_cpu(login_req->tsih); 1057 } 1058 1059 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); 1060 1061 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); 1062 isert_dbg("Using login payload size: %d, rx_buflen: %d " 1063 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, 1064 MAX_KEY_VALUE_PAIRS); 1065 memcpy(login->req_buf, &rx_desc->data[0], size); 1066 1067 if (login->first_request) { 1068 complete(&isert_conn->login_comp); 1069 return; 1070 } 1071 schedule_delayed_work(&conn->login_work, 0); 1072 } 1073 1074 static struct iscsi_cmd 1075 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc) 1076 { 1077 struct isert_conn *isert_conn = conn->context; 1078 struct isert_cmd *isert_cmd; 1079 struct iscsi_cmd *cmd; 1080 1081 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 1082 if (!cmd) { 1083 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n"); 1084 return NULL; 1085 } 1086 isert_cmd = iscsit_priv_cmd(cmd); 1087 isert_cmd->conn = isert_conn; 1088 isert_cmd->iscsi_cmd = cmd; 1089 isert_cmd->rx_desc = rx_desc; 1090 1091 return cmd; 1092 } 1093 1094 static int 1095 isert_handle_scsi_cmd(struct isert_conn *isert_conn, 1096 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, 1097 struct iser_rx_desc *rx_desc, unsigned char *buf) 1098 { 1099 struct iscsi_conn *conn = isert_conn->conn; 1100 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1101 int imm_data, imm_data_len, unsol_data, sg_nents, rc; 1102 bool dump_payload = false; 1103 unsigned int data_len; 1104 1105 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1106 if (rc < 0) 1107 return rc; 1108 1109 imm_data = cmd->immediate_data; 1110 imm_data_len = cmd->first_burst_len; 1111 unsol_data = cmd->unsolicited_data; 1112 data_len = cmd->se_cmd.data_length; 1113 1114 if (imm_data && imm_data_len == data_len) 1115 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 1116 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1117 if (rc < 0) { 1118 return 0; 1119 } else if (rc > 0) { 1120 dump_payload = true; 1121 goto sequence_cmd; 1122 } 1123 1124 if (!imm_data) 1125 return 0; 1126 1127 if (imm_data_len != data_len) { 1128 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); 1129 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents, 1130 &rx_desc->data[0], imm_data_len); 1131 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n", 1132 sg_nents, imm_data_len); 1133 } else { 1134 sg_init_table(&isert_cmd->sg, 1); 1135 cmd->se_cmd.t_data_sg = &isert_cmd->sg; 1136 cmd->se_cmd.t_data_nents = 1; 1137 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len); 1138 isert_dbg("Transfer Immediate imm_data_len: %d\n", 1139 imm_data_len); 1140 } 1141 1142 cmd->write_data_done += imm_data_len; 1143 1144 if (cmd->write_data_done == cmd->se_cmd.data_length) { 1145 spin_lock_bh(&cmd->istate_lock); 1146 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1147 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1148 spin_unlock_bh(&cmd->istate_lock); 1149 } 1150 1151 sequence_cmd: 1152 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1153 1154 if (!rc && dump_payload == false && unsol_data) 1155 iscsit_set_unsoliticed_dataout(cmd); 1156 else if (dump_payload && imm_data) 1157 target_put_sess_cmd(&cmd->se_cmd); 1158 1159 return 0; 1160 } 1161 1162 static int 1163 isert_handle_iscsi_dataout(struct isert_conn *isert_conn, 1164 struct iser_rx_desc *rx_desc, unsigned char *buf) 1165 { 1166 struct scatterlist *sg_start; 1167 struct iscsi_conn *conn = isert_conn->conn; 1168 struct iscsi_cmd *cmd = NULL; 1169 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1170 u32 unsol_data_len = ntoh24(hdr->dlength); 1171 int rc, sg_nents, sg_off, page_off; 1172 1173 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1174 if (rc < 0) 1175 return rc; 1176 else if (!cmd) 1177 return 0; 1178 /* 1179 * FIXME: Unexpected unsolicited_data out 1180 */ 1181 if (!cmd->unsolicited_data) { 1182 isert_err("Received unexpected solicited data payload\n"); 1183 dump_stack(); 1184 return -1; 1185 } 1186 1187 isert_dbg("Unsolicited DataOut unsol_data_len: %u, " 1188 "write_data_done: %u, data_length: %u\n", 1189 unsol_data_len, cmd->write_data_done, 1190 cmd->se_cmd.data_length); 1191 1192 sg_off = cmd->write_data_done / PAGE_SIZE; 1193 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 1194 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); 1195 page_off = cmd->write_data_done % PAGE_SIZE; 1196 /* 1197 * FIXME: Non page-aligned unsolicited_data out 1198 */ 1199 if (page_off) { 1200 isert_err("unexpected non-page aligned data payload\n"); 1201 dump_stack(); 1202 return -1; 1203 } 1204 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " 1205 "sg_nents: %u from %p %u\n", sg_start, sg_off, 1206 sg_nents, &rx_desc->data[0], unsol_data_len); 1207 1208 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], 1209 unsol_data_len); 1210 1211 rc = iscsit_check_dataout_payload(cmd, hdr, false); 1212 if (rc < 0) 1213 return rc; 1214 1215 /* 1216 * multiple data-outs on the same command can arrive - 1217 * so post the buffer before hand 1218 */ 1219 rc = isert_post_recv(isert_conn, rx_desc); 1220 if (rc) { 1221 isert_err("ib_post_recv failed with %d\n", rc); 1222 return rc; 1223 } 1224 return 0; 1225 } 1226 1227 static int 1228 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1229 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1230 unsigned char *buf) 1231 { 1232 struct iscsi_conn *conn = isert_conn->conn; 1233 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1234 int rc; 1235 1236 rc = iscsit_setup_nop_out(conn, cmd, hdr); 1237 if (rc < 0) 1238 return rc; 1239 /* 1240 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload 1241 */ 1242 1243 return iscsit_process_nop_out(conn, cmd, hdr); 1244 } 1245 1246 static int 1247 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1248 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1249 struct iscsi_text *hdr) 1250 { 1251 struct iscsi_conn *conn = isert_conn->conn; 1252 u32 payload_length = ntoh24(hdr->dlength); 1253 int rc; 1254 unsigned char *text_in = NULL; 1255 1256 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 1257 if (rc < 0) 1258 return rc; 1259 1260 if (payload_length) { 1261 text_in = kzalloc(payload_length, GFP_KERNEL); 1262 if (!text_in) { 1263 isert_err("Unable to allocate text_in of payload_length: %u\n", 1264 payload_length); 1265 return -ENOMEM; 1266 } 1267 } 1268 cmd->text_in_ptr = text_in; 1269 1270 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); 1271 1272 return iscsit_process_text_cmd(conn, cmd, hdr); 1273 } 1274 1275 static int 1276 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, 1277 uint32_t read_stag, uint64_t read_va, 1278 uint32_t write_stag, uint64_t write_va) 1279 { 1280 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1281 struct iscsi_conn *conn = isert_conn->conn; 1282 struct iscsi_cmd *cmd; 1283 struct isert_cmd *isert_cmd; 1284 int ret = -EINVAL; 1285 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); 1286 1287 if (conn->sess->sess_ops->SessionType && 1288 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { 1289 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," 1290 " ignoring\n", opcode); 1291 return 0; 1292 } 1293 1294 switch (opcode) { 1295 case ISCSI_OP_SCSI_CMD: 1296 cmd = isert_allocate_cmd(conn, rx_desc); 1297 if (!cmd) 1298 break; 1299 1300 isert_cmd = iscsit_priv_cmd(cmd); 1301 isert_cmd->read_stag = read_stag; 1302 isert_cmd->read_va = read_va; 1303 isert_cmd->write_stag = write_stag; 1304 isert_cmd->write_va = write_va; 1305 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag; 1306 1307 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, 1308 rx_desc, (unsigned char *)hdr); 1309 break; 1310 case ISCSI_OP_NOOP_OUT: 1311 cmd = isert_allocate_cmd(conn, rx_desc); 1312 if (!cmd) 1313 break; 1314 1315 isert_cmd = iscsit_priv_cmd(cmd); 1316 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, 1317 rx_desc, (unsigned char *)hdr); 1318 break; 1319 case ISCSI_OP_SCSI_DATA_OUT: 1320 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, 1321 (unsigned char *)hdr); 1322 break; 1323 case ISCSI_OP_SCSI_TMFUNC: 1324 cmd = isert_allocate_cmd(conn, rx_desc); 1325 if (!cmd) 1326 break; 1327 1328 ret = iscsit_handle_task_mgt_cmd(conn, cmd, 1329 (unsigned char *)hdr); 1330 break; 1331 case ISCSI_OP_LOGOUT: 1332 cmd = isert_allocate_cmd(conn, rx_desc); 1333 if (!cmd) 1334 break; 1335 1336 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); 1337 break; 1338 case ISCSI_OP_TEXT: 1339 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) 1340 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 1341 else 1342 cmd = isert_allocate_cmd(conn, rx_desc); 1343 1344 if (!cmd) 1345 break; 1346 1347 isert_cmd = iscsit_priv_cmd(cmd); 1348 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, 1349 rx_desc, (struct iscsi_text *)hdr); 1350 break; 1351 default: 1352 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); 1353 dump_stack(); 1354 break; 1355 } 1356 1357 return ret; 1358 } 1359 1360 static void 1361 isert_print_wc(struct ib_wc *wc, const char *type) 1362 { 1363 if (wc->status != IB_WC_WR_FLUSH_ERR) 1364 isert_err("%s failure: %s (%d) vend_err %x\n", type, 1365 ib_wc_status_msg(wc->status), wc->status, 1366 wc->vendor_err); 1367 else 1368 isert_dbg("%s failure: %s (%d)\n", type, 1369 ib_wc_status_msg(wc->status), wc->status); 1370 } 1371 1372 static void 1373 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc) 1374 { 1375 struct isert_conn *isert_conn = wc->qp->qp_context; 1376 struct ib_device *ib_dev = isert_conn->cm_id->device; 1377 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe); 1378 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1379 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header; 1380 uint64_t read_va = 0, write_va = 0; 1381 uint32_t read_stag = 0, write_stag = 0; 1382 1383 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1384 isert_print_wc(wc, "recv"); 1385 if (wc->status != IB_WC_WR_FLUSH_ERR) 1386 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1387 return; 1388 } 1389 1390 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr, 1391 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1392 1393 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", 1394 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags, 1395 (int)(wc->byte_len - ISER_HEADERS_LEN)); 1396 1397 switch (iser_ctrl->flags & 0xF0) { 1398 case ISCSI_CTRL: 1399 if (iser_ctrl->flags & ISER_RSV) { 1400 read_stag = be32_to_cpu(iser_ctrl->read_stag); 1401 read_va = be64_to_cpu(iser_ctrl->read_va); 1402 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", 1403 read_stag, (unsigned long long)read_va); 1404 } 1405 if (iser_ctrl->flags & ISER_WSV) { 1406 write_stag = be32_to_cpu(iser_ctrl->write_stag); 1407 write_va = be64_to_cpu(iser_ctrl->write_va); 1408 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", 1409 write_stag, (unsigned long long)write_va); 1410 } 1411 1412 isert_dbg("ISER ISCSI_CTRL PDU\n"); 1413 break; 1414 case ISER_HELLO: 1415 isert_err("iSER Hello message\n"); 1416 break; 1417 default: 1418 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags); 1419 break; 1420 } 1421 1422 isert_rx_opcode(isert_conn, rx_desc, 1423 read_stag, read_va, write_stag, write_va); 1424 1425 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr, 1426 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1427 } 1428 1429 static void 1430 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc) 1431 { 1432 struct isert_conn *isert_conn = wc->qp->qp_context; 1433 struct ib_device *ib_dev = isert_conn->cm_id->device; 1434 1435 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1436 isert_print_wc(wc, "login recv"); 1437 return; 1438 } 1439 1440 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma, 1441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1442 1443 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN; 1444 1445 if (isert_conn->conn) { 1446 struct iscsi_login *login = isert_conn->conn->conn_login; 1447 1448 if (login && !login->first_request) 1449 isert_rx_login_req(isert_conn); 1450 } 1451 1452 mutex_lock(&isert_conn->mutex); 1453 complete(&isert_conn->login_req_comp); 1454 mutex_unlock(&isert_conn->mutex); 1455 1456 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma, 1457 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 1458 } 1459 1460 static void 1461 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn) 1462 { 1463 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; 1464 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); 1465 1466 if (!cmd->rw.nr_ops) 1467 return; 1468 1469 if (isert_prot_cmd(conn, se_cmd)) { 1470 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp, 1471 conn->cm_id->port_num, se_cmd->t_data_sg, 1472 se_cmd->t_data_nents, se_cmd->t_prot_sg, 1473 se_cmd->t_prot_nents, dir); 1474 } else { 1475 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num, 1476 se_cmd->t_data_sg, se_cmd->t_data_nents, dir); 1477 } 1478 1479 cmd->rw.nr_ops = 0; 1480 } 1481 1482 static void 1483 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) 1484 { 1485 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1486 struct isert_conn *isert_conn = isert_cmd->conn; 1487 struct iscsi_conn *conn = isert_conn->conn; 1488 struct iscsi_text_rsp *hdr; 1489 1490 isert_dbg("Cmd %p\n", isert_cmd); 1491 1492 switch (cmd->iscsi_opcode) { 1493 case ISCSI_OP_SCSI_CMD: 1494 spin_lock_bh(&conn->cmd_lock); 1495 if (!list_empty(&cmd->i_conn_node)) 1496 list_del_init(&cmd->i_conn_node); 1497 spin_unlock_bh(&conn->cmd_lock); 1498 1499 if (cmd->data_direction == DMA_TO_DEVICE) { 1500 iscsit_stop_dataout_timer(cmd); 1501 /* 1502 * Check for special case during comp_err where 1503 * WRITE_PENDING has been handed off from core, 1504 * but requires an extra target_put_sess_cmd() 1505 * before transport_generic_free_cmd() below. 1506 */ 1507 if (comp_err && 1508 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 1509 struct se_cmd *se_cmd = &cmd->se_cmd; 1510 1511 target_put_sess_cmd(se_cmd); 1512 } 1513 } 1514 1515 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1516 transport_generic_free_cmd(&cmd->se_cmd, 0); 1517 break; 1518 case ISCSI_OP_SCSI_TMFUNC: 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 transport_generic_free_cmd(&cmd->se_cmd, 0); 1525 break; 1526 case ISCSI_OP_REJECT: 1527 case ISCSI_OP_NOOP_OUT: 1528 case ISCSI_OP_TEXT: 1529 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 1530 /* If the continue bit is on, keep the command alive */ 1531 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) 1532 break; 1533 1534 spin_lock_bh(&conn->cmd_lock); 1535 if (!list_empty(&cmd->i_conn_node)) 1536 list_del_init(&cmd->i_conn_node); 1537 spin_unlock_bh(&conn->cmd_lock); 1538 1539 /* 1540 * Handle special case for REJECT when iscsi_add_reject*() has 1541 * overwritten the original iscsi_opcode assignment, and the 1542 * associated cmd->se_cmd needs to be released. 1543 */ 1544 if (cmd->se_cmd.se_tfo != NULL) { 1545 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", 1546 cmd->iscsi_opcode); 1547 transport_generic_free_cmd(&cmd->se_cmd, 0); 1548 break; 1549 } 1550 /* 1551 * Fall-through 1552 */ 1553 default: 1554 iscsit_release_cmd(cmd); 1555 break; 1556 } 1557 } 1558 1559 static void 1560 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) 1561 { 1562 if (tx_desc->dma_addr != 0) { 1563 isert_dbg("unmap single for tx_desc->dma_addr\n"); 1564 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, 1565 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1566 tx_desc->dma_addr = 0; 1567 } 1568 } 1569 1570 static void 1571 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, 1572 struct ib_device *ib_dev, bool comp_err) 1573 { 1574 if (isert_cmd->pdu_buf_dma != 0) { 1575 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n"); 1576 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, 1577 isert_cmd->pdu_buf_len, DMA_TO_DEVICE); 1578 isert_cmd->pdu_buf_dma = 0; 1579 } 1580 1581 isert_unmap_tx_desc(tx_desc, ib_dev); 1582 isert_put_cmd(isert_cmd, comp_err); 1583 } 1584 1585 static int 1586 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) 1587 { 1588 struct ib_mr_status mr_status; 1589 int ret; 1590 1591 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); 1592 if (ret) { 1593 isert_err("ib_check_mr_status failed, ret %d\n", ret); 1594 goto fail_mr_status; 1595 } 1596 1597 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1598 u64 sec_offset_err; 1599 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; 1600 1601 switch (mr_status.sig_err.err_type) { 1602 case IB_SIG_BAD_GUARD: 1603 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1604 break; 1605 case IB_SIG_BAD_REFTAG: 1606 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1607 break; 1608 case IB_SIG_BAD_APPTAG: 1609 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; 1610 break; 1611 } 1612 sec_offset_err = mr_status.sig_err.sig_err_offset; 1613 do_div(sec_offset_err, block_size); 1614 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; 1615 1616 isert_err("PI error found type %d at sector 0x%llx " 1617 "expected 0x%x vs actual 0x%x\n", 1618 mr_status.sig_err.err_type, 1619 (unsigned long long)se_cmd->bad_sector, 1620 mr_status.sig_err.expected, 1621 mr_status.sig_err.actual); 1622 ret = 1; 1623 } 1624 1625 fail_mr_status: 1626 return ret; 1627 } 1628 1629 static void 1630 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) 1631 { 1632 struct isert_conn *isert_conn = wc->qp->qp_context; 1633 struct isert_device *device = isert_conn->device; 1634 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); 1635 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); 1636 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd; 1637 int ret = 0; 1638 1639 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1640 isert_print_wc(wc, "rdma write"); 1641 if (wc->status != IB_WC_WR_FLUSH_ERR) 1642 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1643 isert_completion_put(desc, isert_cmd, device->ib_device, true); 1644 return; 1645 } 1646 1647 isert_dbg("Cmd %p\n", isert_cmd); 1648 1649 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr); 1650 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1651 1652 if (ret) 1653 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0); 1654 else 1655 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd); 1656 } 1657 1658 static void 1659 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) 1660 { 1661 struct isert_conn *isert_conn = wc->qp->qp_context; 1662 struct isert_device *device = isert_conn->device; 1663 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe); 1664 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc); 1665 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1666 struct se_cmd *se_cmd = &cmd->se_cmd; 1667 int ret = 0; 1668 1669 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1670 isert_print_wc(wc, "rdma read"); 1671 if (wc->status != IB_WC_WR_FLUSH_ERR) 1672 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1673 isert_completion_put(desc, isert_cmd, device->ib_device, true); 1674 return; 1675 } 1676 1677 isert_dbg("Cmd %p\n", isert_cmd); 1678 1679 iscsit_stop_dataout_timer(cmd); 1680 1681 if (isert_prot_cmd(isert_conn, se_cmd)) 1682 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr); 1683 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1684 cmd->write_data_done = 0; 1685 1686 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); 1687 spin_lock_bh(&cmd->istate_lock); 1688 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1689 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1690 spin_unlock_bh(&cmd->istate_lock); 1691 1692 if (ret) { 1693 target_put_sess_cmd(se_cmd); 1694 transport_send_check_condition_and_sense(se_cmd, 1695 se_cmd->pi_err, 0); 1696 } else { 1697 target_execute_cmd(se_cmd); 1698 } 1699 } 1700 1701 static void 1702 isert_do_control_comp(struct work_struct *work) 1703 { 1704 struct isert_cmd *isert_cmd = container_of(work, 1705 struct isert_cmd, comp_work); 1706 struct isert_conn *isert_conn = isert_cmd->conn; 1707 struct ib_device *ib_dev = isert_conn->cm_id->device; 1708 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1709 1710 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); 1711 1712 switch (cmd->i_state) { 1713 case ISTATE_SEND_TASKMGTRSP: 1714 iscsit_tmr_post_handler(cmd, cmd->conn); 1715 case ISTATE_SEND_REJECT: /* FALLTHRU */ 1716 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */ 1717 cmd->i_state = ISTATE_SENT_STATUS; 1718 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, 1719 ib_dev, false); 1720 break; 1721 case ISTATE_SEND_LOGOUTRSP: 1722 iscsit_logout_post_handler(cmd, cmd->conn); 1723 break; 1724 default: 1725 isert_err("Unknown i_state %d\n", cmd->i_state); 1726 dump_stack(); 1727 break; 1728 } 1729 } 1730 1731 static void 1732 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc) 1733 { 1734 struct isert_conn *isert_conn = wc->qp->qp_context; 1735 struct ib_device *ib_dev = isert_conn->cm_id->device; 1736 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); 1737 1738 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1739 isert_print_wc(wc, "login send"); 1740 if (wc->status != IB_WC_WR_FLUSH_ERR) 1741 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1742 } 1743 1744 isert_unmap_tx_desc(tx_desc, ib_dev); 1745 } 1746 1747 static void 1748 isert_send_done(struct ib_cq *cq, struct ib_wc *wc) 1749 { 1750 struct isert_conn *isert_conn = wc->qp->qp_context; 1751 struct ib_device *ib_dev = isert_conn->cm_id->device; 1752 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe); 1753 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc); 1754 1755 if (unlikely(wc->status != IB_WC_SUCCESS)) { 1756 isert_print_wc(wc, "send"); 1757 if (wc->status != IB_WC_WR_FLUSH_ERR) 1758 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 1759 isert_completion_put(tx_desc, isert_cmd, ib_dev, true); 1760 return; 1761 } 1762 1763 isert_dbg("Cmd %p\n", isert_cmd); 1764 1765 switch (isert_cmd->iscsi_cmd->i_state) { 1766 case ISTATE_SEND_TASKMGTRSP: 1767 case ISTATE_SEND_LOGOUTRSP: 1768 case ISTATE_SEND_REJECT: 1769 case ISTATE_SEND_TEXTRSP: 1770 isert_unmap_tx_desc(tx_desc, ib_dev); 1771 1772 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); 1773 queue_work(isert_comp_wq, &isert_cmd->comp_work); 1774 return; 1775 default: 1776 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS; 1777 isert_completion_put(tx_desc, isert_cmd, ib_dev, false); 1778 break; 1779 } 1780 } 1781 1782 static int 1783 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) 1784 { 1785 struct ib_send_wr *wr_failed; 1786 int ret; 1787 1788 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc); 1789 if (ret) { 1790 isert_err("ib_post_recv failed with %d\n", ret); 1791 return ret; 1792 } 1793 1794 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, 1795 &wr_failed); 1796 if (ret) { 1797 isert_err("ib_post_send failed with %d\n", ret); 1798 return ret; 1799 } 1800 return ret; 1801 } 1802 1803 static int 1804 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 1805 { 1806 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1807 struct isert_conn *isert_conn = conn->context; 1808 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1809 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) 1810 &isert_cmd->tx_desc.iscsi_header; 1811 1812 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1813 iscsit_build_rsp_pdu(cmd, conn, true, hdr); 1814 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1815 /* 1816 * Attach SENSE DATA payload to iSCSI Response PDU 1817 */ 1818 if (cmd->se_cmd.sense_buffer && 1819 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 1820 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 1821 struct isert_device *device = isert_conn->device; 1822 struct ib_device *ib_dev = device->ib_device; 1823 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 1824 u32 padding, pdu_len; 1825 1826 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, 1827 cmd->sense_buffer); 1828 cmd->se_cmd.scsi_sense_length += sizeof(__be16); 1829 1830 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 1831 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 1832 pdu_len = cmd->se_cmd.scsi_sense_length + padding; 1833 1834 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 1835 (void *)cmd->sense_buffer, pdu_len, 1836 DMA_TO_DEVICE); 1837 1838 isert_cmd->pdu_buf_len = pdu_len; 1839 tx_dsg->addr = isert_cmd->pdu_buf_dma; 1840 tx_dsg->length = pdu_len; 1841 tx_dsg->lkey = device->pd->local_dma_lkey; 1842 isert_cmd->tx_desc.num_sge = 2; 1843 } 1844 1845 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1846 1847 isert_dbg("Posting SCSI Response\n"); 1848 1849 return isert_post_response(isert_conn, isert_cmd); 1850 } 1851 1852 static void 1853 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 1854 { 1855 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1856 struct isert_conn *isert_conn = conn->context; 1857 1858 spin_lock_bh(&conn->cmd_lock); 1859 if (!list_empty(&cmd->i_conn_node)) 1860 list_del_init(&cmd->i_conn_node); 1861 spin_unlock_bh(&conn->cmd_lock); 1862 1863 if (cmd->data_direction == DMA_TO_DEVICE) 1864 iscsit_stop_dataout_timer(cmd); 1865 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); 1866 } 1867 1868 static enum target_prot_op 1869 isert_get_sup_prot_ops(struct iscsi_conn *conn) 1870 { 1871 struct isert_conn *isert_conn = conn->context; 1872 struct isert_device *device = isert_conn->device; 1873 1874 if (conn->tpg->tpg_attrib.t10_pi) { 1875 if (device->pi_capable) { 1876 isert_info("conn %p PI offload enabled\n", isert_conn); 1877 isert_conn->pi_support = true; 1878 return TARGET_PROT_ALL; 1879 } 1880 } 1881 1882 isert_info("conn %p PI offload disabled\n", isert_conn); 1883 isert_conn->pi_support = false; 1884 1885 return TARGET_PROT_NORMAL; 1886 } 1887 1888 static int 1889 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 1890 bool nopout_response) 1891 { 1892 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1893 struct isert_conn *isert_conn = conn->context; 1894 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1895 1896 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1897 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) 1898 &isert_cmd->tx_desc.iscsi_header, 1899 nopout_response); 1900 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1901 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1902 1903 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); 1904 1905 return isert_post_response(isert_conn, isert_cmd); 1906 } 1907 1908 static int 1909 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1910 { 1911 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1912 struct isert_conn *isert_conn = conn->context; 1913 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1914 1915 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1916 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) 1917 &isert_cmd->tx_desc.iscsi_header); 1918 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1919 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1920 1921 isert_dbg("conn %p Posting Logout Response\n", isert_conn); 1922 1923 return isert_post_response(isert_conn, isert_cmd); 1924 } 1925 1926 static int 1927 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1928 { 1929 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1930 struct isert_conn *isert_conn = conn->context; 1931 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1932 1933 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1934 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) 1935 &isert_cmd->tx_desc.iscsi_header); 1936 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1937 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1938 1939 isert_dbg("conn %p Posting Task Management Response\n", isert_conn); 1940 1941 return isert_post_response(isert_conn, isert_cmd); 1942 } 1943 1944 static int 1945 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1946 { 1947 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1948 struct isert_conn *isert_conn = conn->context; 1949 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1950 struct isert_device *device = isert_conn->device; 1951 struct ib_device *ib_dev = device->ib_device; 1952 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 1953 struct iscsi_reject *hdr = 1954 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; 1955 1956 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1957 iscsit_build_reject(cmd, conn, hdr); 1958 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1959 1960 hton24(hdr->dlength, ISCSI_HDR_LEN); 1961 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 1962 (void *)cmd->buf_ptr, ISCSI_HDR_LEN, 1963 DMA_TO_DEVICE); 1964 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; 1965 tx_dsg->addr = isert_cmd->pdu_buf_dma; 1966 tx_dsg->length = ISCSI_HDR_LEN; 1967 tx_dsg->lkey = device->pd->local_dma_lkey; 1968 isert_cmd->tx_desc.num_sge = 2; 1969 1970 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 1971 1972 isert_dbg("conn %p Posting Reject\n", isert_conn); 1973 1974 return isert_post_response(isert_conn, isert_cmd); 1975 } 1976 1977 static int 1978 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1979 { 1980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 1981 struct isert_conn *isert_conn = conn->context; 1982 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 1983 struct iscsi_text_rsp *hdr = 1984 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 1985 u32 txt_rsp_len; 1986 int rc; 1987 1988 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 1989 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); 1990 if (rc < 0) 1991 return rc; 1992 1993 txt_rsp_len = rc; 1994 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 1995 1996 if (txt_rsp_len) { 1997 struct isert_device *device = isert_conn->device; 1998 struct ib_device *ib_dev = device->ib_device; 1999 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2000 void *txt_rsp_buf = cmd->buf_ptr; 2001 2002 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2003 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); 2004 2005 isert_cmd->pdu_buf_len = txt_rsp_len; 2006 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2007 tx_dsg->length = txt_rsp_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 Text Response\n", isert_conn); 2014 2015 return isert_post_response(isert_conn, isert_cmd); 2016 } 2017 2018 static inline void 2019 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs, 2020 struct ib_sig_domain *domain) 2021 { 2022 domain->sig_type = IB_SIG_TYPE_T10_DIF; 2023 domain->sig.dif.bg_type = IB_T10DIF_CRC; 2024 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; 2025 domain->sig.dif.ref_tag = se_cmd->reftag_seed; 2026 /* 2027 * At the moment we hard code those, but if in the future 2028 * the target core would like to use it, we will take it 2029 * from se_cmd. 2030 */ 2031 domain->sig.dif.apptag_check_mask = 0xffff; 2032 domain->sig.dif.app_escape = true; 2033 domain->sig.dif.ref_escape = true; 2034 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || 2035 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) 2036 domain->sig.dif.ref_remap = true; 2037 }; 2038 2039 static int 2040 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) 2041 { 2042 memset(sig_attrs, 0, sizeof(*sig_attrs)); 2043 2044 switch (se_cmd->prot_op) { 2045 case TARGET_PROT_DIN_INSERT: 2046 case TARGET_PROT_DOUT_STRIP: 2047 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; 2048 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2049 break; 2050 case TARGET_PROT_DOUT_INSERT: 2051 case TARGET_PROT_DIN_STRIP: 2052 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 2053 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2054 break; 2055 case TARGET_PROT_DIN_PASS: 2056 case TARGET_PROT_DOUT_PASS: 2057 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2058 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2059 break; 2060 default: 2061 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); 2062 return -EINVAL; 2063 } 2064 2065 sig_attrs->check_mask = 2066 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) | 2067 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) | 2068 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0); 2069 return 0; 2070 } 2071 2072 static int 2073 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn, 2074 struct ib_cqe *cqe, struct ib_send_wr *chain_wr) 2075 { 2076 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd; 2077 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd); 2078 u8 port_num = conn->cm_id->port_num; 2079 u64 addr; 2080 u32 rkey, offset; 2081 int ret; 2082 2083 if (dir == DMA_FROM_DEVICE) { 2084 addr = cmd->write_va; 2085 rkey = cmd->write_stag; 2086 offset = cmd->iscsi_cmd->write_data_done; 2087 } else { 2088 addr = cmd->read_va; 2089 rkey = cmd->read_stag; 2090 offset = 0; 2091 } 2092 2093 if (isert_prot_cmd(conn, se_cmd)) { 2094 struct ib_sig_attrs sig_attrs; 2095 2096 ret = isert_set_sig_attrs(se_cmd, &sig_attrs); 2097 if (ret) 2098 return ret; 2099 2100 WARN_ON_ONCE(offset); 2101 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num, 2102 se_cmd->t_data_sg, se_cmd->t_data_nents, 2103 se_cmd->t_prot_sg, se_cmd->t_prot_nents, 2104 &sig_attrs, addr, rkey, dir); 2105 } else { 2106 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num, 2107 se_cmd->t_data_sg, se_cmd->t_data_nents, 2108 offset, addr, rkey, dir); 2109 } 2110 if (ret < 0) { 2111 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd); 2112 return ret; 2113 } 2114 2115 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr); 2116 if (ret < 0) 2117 isert_err("Cmd: %p failed to post RDMA res\n", cmd); 2118 return ret; 2119 } 2120 2121 static int 2122 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2123 { 2124 struct se_cmd *se_cmd = &cmd->se_cmd; 2125 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2126 struct isert_conn *isert_conn = conn->context; 2127 struct ib_cqe *cqe = NULL; 2128 struct ib_send_wr *chain_wr = NULL; 2129 int rc; 2130 2131 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", 2132 isert_cmd, se_cmd->data_length); 2133 2134 if (isert_prot_cmd(isert_conn, se_cmd)) { 2135 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done; 2136 cqe = &isert_cmd->tx_desc.tx_cqe; 2137 } else { 2138 /* 2139 * Build isert_conn->tx_desc for iSCSI response PDU and attach 2140 */ 2141 isert_create_send_desc(isert_conn, isert_cmd, 2142 &isert_cmd->tx_desc); 2143 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) 2144 &isert_cmd->tx_desc.iscsi_header); 2145 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2146 isert_init_send_wr(isert_conn, isert_cmd, 2147 &isert_cmd->tx_desc.send_wr); 2148 2149 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc); 2150 if (rc) { 2151 isert_err("ib_post_recv failed with %d\n", rc); 2152 return rc; 2153 } 2154 2155 chain_wr = &isert_cmd->tx_desc.send_wr; 2156 } 2157 2158 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr); 2159 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd); 2160 return 1; 2161 } 2162 2163 static int 2164 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) 2165 { 2166 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2167 2168 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", 2169 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done); 2170 2171 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done; 2172 isert_rdma_rw_ctx_post(isert_cmd, conn->context, 2173 &isert_cmd->tx_desc.tx_cqe, NULL); 2174 2175 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", 2176 isert_cmd); 2177 return 0; 2178 } 2179 2180 static int 2181 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 2182 { 2183 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2184 int ret = 0; 2185 2186 switch (state) { 2187 case ISTATE_REMOVE: 2188 spin_lock_bh(&conn->cmd_lock); 2189 list_del_init(&cmd->i_conn_node); 2190 spin_unlock_bh(&conn->cmd_lock); 2191 isert_put_cmd(isert_cmd, true); 2192 break; 2193 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 2194 ret = isert_put_nopin(cmd, conn, false); 2195 break; 2196 default: 2197 isert_err("Unknown immediate state: 0x%02x\n", state); 2198 ret = -EINVAL; 2199 break; 2200 } 2201 2202 return ret; 2203 } 2204 2205 static int 2206 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 2207 { 2208 struct isert_conn *isert_conn = conn->context; 2209 int ret; 2210 2211 switch (state) { 2212 case ISTATE_SEND_LOGOUTRSP: 2213 ret = isert_put_logout_rsp(cmd, conn); 2214 if (!ret) 2215 isert_conn->logout_posted = true; 2216 break; 2217 case ISTATE_SEND_NOPIN: 2218 ret = isert_put_nopin(cmd, conn, true); 2219 break; 2220 case ISTATE_SEND_TASKMGTRSP: 2221 ret = isert_put_tm_rsp(cmd, conn); 2222 break; 2223 case ISTATE_SEND_REJECT: 2224 ret = isert_put_reject(cmd, conn); 2225 break; 2226 case ISTATE_SEND_TEXTRSP: 2227 ret = isert_put_text_rsp(cmd, conn); 2228 break; 2229 case ISTATE_SEND_STATUS: 2230 /* 2231 * Special case for sending non GOOD SCSI status from TX thread 2232 * context during pre se_cmd excecution failure. 2233 */ 2234 ret = isert_put_response(conn, cmd); 2235 break; 2236 default: 2237 isert_err("Unknown response state: 0x%02x\n", state); 2238 ret = -EINVAL; 2239 break; 2240 } 2241 2242 return ret; 2243 } 2244 2245 struct rdma_cm_id * 2246 isert_setup_id(struct isert_np *isert_np) 2247 { 2248 struct iscsi_np *np = isert_np->np; 2249 struct rdma_cm_id *id; 2250 struct sockaddr *sa; 2251 int ret; 2252 2253 sa = (struct sockaddr *)&np->np_sockaddr; 2254 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); 2255 2256 id = rdma_create_id(&init_net, isert_cma_handler, isert_np, 2257 RDMA_PS_TCP, IB_QPT_RC); 2258 if (IS_ERR(id)) { 2259 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); 2260 ret = PTR_ERR(id); 2261 goto out; 2262 } 2263 isert_dbg("id %p context %p\n", id, id->context); 2264 2265 ret = rdma_bind_addr(id, sa); 2266 if (ret) { 2267 isert_err("rdma_bind_addr() failed: %d\n", ret); 2268 goto out_id; 2269 } 2270 2271 ret = rdma_listen(id, 0); 2272 if (ret) { 2273 isert_err("rdma_listen() failed: %d\n", ret); 2274 goto out_id; 2275 } 2276 2277 return id; 2278 out_id: 2279 rdma_destroy_id(id); 2280 out: 2281 return ERR_PTR(ret); 2282 } 2283 2284 static int 2285 isert_setup_np(struct iscsi_np *np, 2286 struct sockaddr_storage *ksockaddr) 2287 { 2288 struct isert_np *isert_np; 2289 struct rdma_cm_id *isert_lid; 2290 int ret; 2291 2292 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); 2293 if (!isert_np) { 2294 isert_err("Unable to allocate struct isert_np\n"); 2295 return -ENOMEM; 2296 } 2297 sema_init(&isert_np->sem, 0); 2298 mutex_init(&isert_np->mutex); 2299 INIT_LIST_HEAD(&isert_np->accepted); 2300 INIT_LIST_HEAD(&isert_np->pending); 2301 isert_np->np = np; 2302 2303 /* 2304 * Setup the np->np_sockaddr from the passed sockaddr setup 2305 * in iscsi_target_configfs.c code.. 2306 */ 2307 memcpy(&np->np_sockaddr, ksockaddr, 2308 sizeof(struct sockaddr_storage)); 2309 2310 isert_lid = isert_setup_id(isert_np); 2311 if (IS_ERR(isert_lid)) { 2312 ret = PTR_ERR(isert_lid); 2313 goto out; 2314 } 2315 2316 isert_np->cm_id = isert_lid; 2317 np->np_context = isert_np; 2318 2319 return 0; 2320 2321 out: 2322 kfree(isert_np); 2323 2324 return ret; 2325 } 2326 2327 static int 2328 isert_rdma_accept(struct isert_conn *isert_conn) 2329 { 2330 struct rdma_cm_id *cm_id = isert_conn->cm_id; 2331 struct rdma_conn_param cp; 2332 int ret; 2333 struct iser_cm_hdr rsp_hdr; 2334 2335 memset(&cp, 0, sizeof(struct rdma_conn_param)); 2336 cp.initiator_depth = isert_conn->initiator_depth; 2337 cp.retry_count = 7; 2338 cp.rnr_retry_count = 7; 2339 2340 memset(&rsp_hdr, 0, sizeof(rsp_hdr)); 2341 rsp_hdr.flags = ISERT_ZBVA_NOT_USED; 2342 if (!isert_conn->snd_w_inv) 2343 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED; 2344 cp.private_data = (void *)&rsp_hdr; 2345 cp.private_data_len = sizeof(rsp_hdr); 2346 2347 ret = rdma_accept(cm_id, &cp); 2348 if (ret) { 2349 isert_err("rdma_accept() failed with: %d\n", ret); 2350 return ret; 2351 } 2352 2353 return 0; 2354 } 2355 2356 static int 2357 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 2358 { 2359 struct isert_conn *isert_conn = conn->context; 2360 int ret; 2361 2362 isert_info("before login_req comp conn: %p\n", isert_conn); 2363 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); 2364 if (ret) { 2365 isert_err("isert_conn %p interrupted before got login req\n", 2366 isert_conn); 2367 return ret; 2368 } 2369 reinit_completion(&isert_conn->login_req_comp); 2370 2371 /* 2372 * For login requests after the first PDU, isert_rx_login_req() will 2373 * kick schedule_delayed_work(&conn->login_work) as the packet is 2374 * received, which turns this callback from iscsi_target_do_login_rx() 2375 * into a NOP. 2376 */ 2377 if (!login->first_request) 2378 return 0; 2379 2380 isert_rx_login_req(isert_conn); 2381 2382 isert_info("before login_comp conn: %p\n", conn); 2383 ret = wait_for_completion_interruptible(&isert_conn->login_comp); 2384 if (ret) 2385 return ret; 2386 2387 isert_info("processing login->req: %p\n", login->req); 2388 2389 return 0; 2390 } 2391 2392 static void 2393 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, 2394 struct isert_conn *isert_conn) 2395 { 2396 struct rdma_cm_id *cm_id = isert_conn->cm_id; 2397 struct rdma_route *cm_route = &cm_id->route; 2398 2399 conn->login_family = np->np_sockaddr.ss_family; 2400 2401 conn->login_sockaddr = cm_route->addr.dst_addr; 2402 conn->local_sockaddr = cm_route->addr.src_addr; 2403 } 2404 2405 static int 2406 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 2407 { 2408 struct isert_np *isert_np = np->np_context; 2409 struct isert_conn *isert_conn; 2410 int ret; 2411 2412 accept_wait: 2413 ret = down_interruptible(&isert_np->sem); 2414 if (ret) 2415 return -ENODEV; 2416 2417 spin_lock_bh(&np->np_thread_lock); 2418 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { 2419 spin_unlock_bh(&np->np_thread_lock); 2420 isert_dbg("np_thread_state %d\n", 2421 np->np_thread_state); 2422 /** 2423 * No point in stalling here when np_thread 2424 * is in state RESET/SHUTDOWN/EXIT - bail 2425 **/ 2426 return -ENODEV; 2427 } 2428 spin_unlock_bh(&np->np_thread_lock); 2429 2430 mutex_lock(&isert_np->mutex); 2431 if (list_empty(&isert_np->pending)) { 2432 mutex_unlock(&isert_np->mutex); 2433 goto accept_wait; 2434 } 2435 isert_conn = list_first_entry(&isert_np->pending, 2436 struct isert_conn, node); 2437 list_del_init(&isert_conn->node); 2438 mutex_unlock(&isert_np->mutex); 2439 2440 conn->context = isert_conn; 2441 isert_conn->conn = conn; 2442 isert_conn->state = ISER_CONN_BOUND; 2443 2444 isert_set_conn_info(np, conn, isert_conn); 2445 2446 isert_dbg("Processing isert_conn: %p\n", isert_conn); 2447 2448 return 0; 2449 } 2450 2451 static void 2452 isert_free_np(struct iscsi_np *np) 2453 { 2454 struct isert_np *isert_np = np->np_context; 2455 struct isert_conn *isert_conn, *n; 2456 2457 if (isert_np->cm_id) 2458 rdma_destroy_id(isert_np->cm_id); 2459 2460 /* 2461 * FIXME: At this point we don't have a good way to insure 2462 * that at this point we don't have hanging connections that 2463 * completed RDMA establishment but didn't start iscsi login 2464 * process. So work-around this by cleaning up what ever piled 2465 * up in accepted and pending lists. 2466 */ 2467 mutex_lock(&isert_np->mutex); 2468 if (!list_empty(&isert_np->pending)) { 2469 isert_info("Still have isert pending connections\n"); 2470 list_for_each_entry_safe(isert_conn, n, 2471 &isert_np->pending, 2472 node) { 2473 isert_info("cleaning isert_conn %p state (%d)\n", 2474 isert_conn, isert_conn->state); 2475 isert_connect_release(isert_conn); 2476 } 2477 } 2478 2479 if (!list_empty(&isert_np->accepted)) { 2480 isert_info("Still have isert accepted connections\n"); 2481 list_for_each_entry_safe(isert_conn, n, 2482 &isert_np->accepted, 2483 node) { 2484 isert_info("cleaning isert_conn %p state (%d)\n", 2485 isert_conn, isert_conn->state); 2486 isert_connect_release(isert_conn); 2487 } 2488 } 2489 mutex_unlock(&isert_np->mutex); 2490 2491 np->np_context = NULL; 2492 kfree(isert_np); 2493 } 2494 2495 static void isert_release_work(struct work_struct *work) 2496 { 2497 struct isert_conn *isert_conn = container_of(work, 2498 struct isert_conn, 2499 release_work); 2500 2501 isert_info("Starting release conn %p\n", isert_conn); 2502 2503 mutex_lock(&isert_conn->mutex); 2504 isert_conn->state = ISER_CONN_DOWN; 2505 mutex_unlock(&isert_conn->mutex); 2506 2507 isert_info("Destroying conn %p\n", isert_conn); 2508 isert_put_conn(isert_conn); 2509 } 2510 2511 static void 2512 isert_wait4logout(struct isert_conn *isert_conn) 2513 { 2514 struct iscsi_conn *conn = isert_conn->conn; 2515 2516 isert_info("conn %p\n", isert_conn); 2517 2518 if (isert_conn->logout_posted) { 2519 isert_info("conn %p wait for conn_logout_comp\n", isert_conn); 2520 wait_for_completion_timeout(&conn->conn_logout_comp, 2521 SECONDS_FOR_LOGOUT_COMP * HZ); 2522 } 2523 } 2524 2525 static void 2526 isert_wait4cmds(struct iscsi_conn *conn) 2527 { 2528 isert_info("iscsi_conn %p\n", conn); 2529 2530 if (conn->sess) { 2531 target_sess_cmd_list_set_waiting(conn->sess->se_sess); 2532 target_wait_for_sess_cmds(conn->sess->se_sess); 2533 } 2534 } 2535 2536 /** 2537 * isert_put_unsol_pending_cmds() - Drop commands waiting for 2538 * unsolicitate dataout 2539 * @conn: iscsi connection 2540 * 2541 * We might still have commands that are waiting for unsolicited 2542 * dataouts messages. We must put the extra reference on those 2543 * before blocking on the target_wait_for_session_cmds 2544 */ 2545 static void 2546 isert_put_unsol_pending_cmds(struct iscsi_conn *conn) 2547 { 2548 struct iscsi_cmd *cmd, *tmp; 2549 static LIST_HEAD(drop_cmd_list); 2550 2551 spin_lock_bh(&conn->cmd_lock); 2552 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) { 2553 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) && 2554 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) && 2555 (cmd->write_data_done < cmd->se_cmd.data_length)) 2556 list_move_tail(&cmd->i_conn_node, &drop_cmd_list); 2557 } 2558 spin_unlock_bh(&conn->cmd_lock); 2559 2560 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) { 2561 list_del_init(&cmd->i_conn_node); 2562 if (cmd->i_state != ISTATE_REMOVE) { 2563 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2564 2565 isert_info("conn %p dropping cmd %p\n", conn, cmd); 2566 isert_put_cmd(isert_cmd, true); 2567 } 2568 } 2569 } 2570 2571 static void isert_wait_conn(struct iscsi_conn *conn) 2572 { 2573 struct isert_conn *isert_conn = conn->context; 2574 2575 isert_info("Starting conn %p\n", isert_conn); 2576 2577 mutex_lock(&isert_conn->mutex); 2578 isert_conn_terminate(isert_conn); 2579 mutex_unlock(&isert_conn->mutex); 2580 2581 ib_drain_qp(isert_conn->qp); 2582 isert_put_unsol_pending_cmds(conn); 2583 isert_wait4cmds(conn); 2584 isert_wait4logout(isert_conn); 2585 2586 queue_work(isert_release_wq, &isert_conn->release_work); 2587 } 2588 2589 static void isert_free_conn(struct iscsi_conn *conn) 2590 { 2591 struct isert_conn *isert_conn = conn->context; 2592 2593 ib_drain_qp(isert_conn->qp); 2594 isert_put_conn(isert_conn); 2595 } 2596 2597 static void isert_get_rx_pdu(struct iscsi_conn *conn) 2598 { 2599 struct completion comp; 2600 2601 init_completion(&comp); 2602 2603 wait_for_completion_interruptible(&comp); 2604 } 2605 2606 static struct iscsit_transport iser_target_transport = { 2607 .name = "IB/iSER", 2608 .transport_type = ISCSI_INFINIBAND, 2609 .rdma_shutdown = true, 2610 .priv_size = sizeof(struct isert_cmd), 2611 .owner = THIS_MODULE, 2612 .iscsit_setup_np = isert_setup_np, 2613 .iscsit_accept_np = isert_accept_np, 2614 .iscsit_free_np = isert_free_np, 2615 .iscsit_wait_conn = isert_wait_conn, 2616 .iscsit_free_conn = isert_free_conn, 2617 .iscsit_get_login_rx = isert_get_login_rx, 2618 .iscsit_put_login_tx = isert_put_login_tx, 2619 .iscsit_immediate_queue = isert_immediate_queue, 2620 .iscsit_response_queue = isert_response_queue, 2621 .iscsit_get_dataout = isert_get_dataout, 2622 .iscsit_queue_data_in = isert_put_datain, 2623 .iscsit_queue_status = isert_put_response, 2624 .iscsit_aborted_task = isert_aborted_task, 2625 .iscsit_get_rx_pdu = isert_get_rx_pdu, 2626 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, 2627 }; 2628 2629 static int __init isert_init(void) 2630 { 2631 int ret; 2632 2633 isert_comp_wq = alloc_workqueue("isert_comp_wq", 2634 WQ_UNBOUND | WQ_HIGHPRI, 0); 2635 if (!isert_comp_wq) { 2636 isert_err("Unable to allocate isert_comp_wq\n"); 2637 ret = -ENOMEM; 2638 return -ENOMEM; 2639 } 2640 2641 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, 2642 WQ_UNBOUND_MAX_ACTIVE); 2643 if (!isert_release_wq) { 2644 isert_err("Unable to allocate isert_release_wq\n"); 2645 ret = -ENOMEM; 2646 goto destroy_comp_wq; 2647 } 2648 2649 iscsit_register_transport(&iser_target_transport); 2650 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); 2651 2652 return 0; 2653 2654 destroy_comp_wq: 2655 destroy_workqueue(isert_comp_wq); 2656 2657 return ret; 2658 } 2659 2660 static void __exit isert_exit(void) 2661 { 2662 flush_scheduled_work(); 2663 destroy_workqueue(isert_release_wq); 2664 destroy_workqueue(isert_comp_wq); 2665 iscsit_unregister_transport(&iser_target_transport); 2666 isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); 2667 } 2668 2669 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); 2670 MODULE_VERSION("1.0"); 2671 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 2672 MODULE_LICENSE("GPL"); 2673 2674 module_init(isert_init); 2675 module_exit(isert_exit); 2676