1 /* 2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 * 33 * $Id: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $ 34 */ 35 #include <asm/io.h> 36 #include <linux/kernel.h> 37 #include <linux/module.h> 38 #include <linux/smp_lock.h> 39 #include <linux/delay.h> 40 #include <linux/version.h> 41 42 #include "iscsi_iser.h" 43 44 #define ISCSI_ISER_MAX_CONN 8 45 #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \ 46 ISER_QP_MAX_REQ_DTOS) * \ 47 ISCSI_ISER_MAX_CONN) 48 49 static void iser_cq_tasklet_fn(unsigned long data); 50 static void iser_cq_callback(struct ib_cq *cq, void *cq_context); 51 static void iser_comp_error_worker(void *data); 52 53 static void iser_cq_event_callback(struct ib_event *cause, void *context) 54 { 55 iser_err("got cq event %d \n", cause->event); 56 } 57 58 static void iser_qp_event_callback(struct ib_event *cause, void *context) 59 { 60 iser_err("got qp event %d\n",cause->event); 61 } 62 63 /** 64 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 65 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 66 * the adapator. 67 * 68 * returns 0 on success, -1 on failure 69 */ 70 static int iser_create_device_ib_res(struct iser_device *device) 71 { 72 device->pd = ib_alloc_pd(device->ib_device); 73 if (IS_ERR(device->pd)) 74 goto pd_err; 75 76 device->cq = ib_create_cq(device->ib_device, 77 iser_cq_callback, 78 iser_cq_event_callback, 79 (void *)device, 80 ISER_MAX_CQ_LEN); 81 if (IS_ERR(device->cq)) 82 goto cq_err; 83 84 if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP)) 85 goto cq_arm_err; 86 87 tasklet_init(&device->cq_tasklet, 88 iser_cq_tasklet_fn, 89 (unsigned long)device); 90 91 device->mr = ib_get_dma_mr(device->pd, 92 IB_ACCESS_LOCAL_WRITE); 93 if (IS_ERR(device->mr)) 94 goto dma_mr_err; 95 96 return 0; 97 98 dma_mr_err: 99 tasklet_kill(&device->cq_tasklet); 100 cq_arm_err: 101 ib_destroy_cq(device->cq); 102 cq_err: 103 ib_dealloc_pd(device->pd); 104 pd_err: 105 iser_err("failed to allocate an IB resource\n"); 106 return -1; 107 } 108 109 /** 110 * iser_free_device_ib_res - destory/dealloc/dereg the DMA MR, 111 * CQ and PD created with the device associated with the adapator. 112 */ 113 static void iser_free_device_ib_res(struct iser_device *device) 114 { 115 BUG_ON(device->mr == NULL); 116 117 tasklet_kill(&device->cq_tasklet); 118 119 (void)ib_dereg_mr(device->mr); 120 (void)ib_destroy_cq(device->cq); 121 (void)ib_dealloc_pd(device->pd); 122 123 device->mr = NULL; 124 device->cq = NULL; 125 device->pd = NULL; 126 } 127 128 /** 129 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 130 * 131 * returns 0 on success, -1 on failure 132 */ 133 static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 134 { 135 struct iser_device *device; 136 struct ib_qp_init_attr init_attr; 137 int ret; 138 struct ib_fmr_pool_param params; 139 140 BUG_ON(ib_conn->device == NULL); 141 142 device = ib_conn->device; 143 144 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 145 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 146 GFP_KERNEL); 147 if (!ib_conn->page_vec) { 148 ret = -ENOMEM; 149 goto alloc_err; 150 } 151 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 152 153 params.page_shift = PAGE_SHIFT; 154 /* when the first/last SG element are not start/end * 155 * page aligned, the map whould be of N+1 pages */ 156 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 157 /* make the pool size twice the max number of SCSI commands * 158 * the ML is expected to queue, watermark for unmap at 50% */ 159 params.pool_size = ISCSI_XMIT_CMDS_MAX * 2; 160 params.dirty_watermark = ISCSI_XMIT_CMDS_MAX; 161 params.cache = 0; 162 params.flush_function = NULL; 163 params.access = (IB_ACCESS_LOCAL_WRITE | 164 IB_ACCESS_REMOTE_WRITE | 165 IB_ACCESS_REMOTE_READ); 166 167 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 168 if (IS_ERR(ib_conn->fmr_pool)) { 169 ret = PTR_ERR(ib_conn->fmr_pool); 170 goto fmr_pool_err; 171 } 172 173 memset(&init_attr, 0, sizeof init_attr); 174 175 init_attr.event_handler = iser_qp_event_callback; 176 init_attr.qp_context = (void *)ib_conn; 177 init_attr.send_cq = device->cq; 178 init_attr.recv_cq = device->cq; 179 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 180 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 181 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; 182 init_attr.cap.max_recv_sge = 2; 183 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 184 init_attr.qp_type = IB_QPT_RC; 185 186 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 187 if (ret) 188 goto qp_err; 189 190 ib_conn->qp = ib_conn->cma_id->qp; 191 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 192 ib_conn, ib_conn->cma_id, 193 ib_conn->fmr_pool, ib_conn->cma_id->qp); 194 return ret; 195 196 qp_err: 197 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); 198 fmr_pool_err: 199 kfree(ib_conn->page_vec); 200 alloc_err: 201 iser_err("unable to alloc mem or create resource, err %d\n", ret); 202 return ret; 203 } 204 205 /** 206 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 207 * -1 on failure 208 */ 209 static int iser_free_ib_conn_res(struct iser_conn *ib_conn) 210 { 211 BUG_ON(ib_conn == NULL); 212 213 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 214 ib_conn, ib_conn->cma_id, 215 ib_conn->fmr_pool, ib_conn->qp); 216 217 /* qp is created only once both addr & route are resolved */ 218 if (ib_conn->fmr_pool != NULL) 219 ib_destroy_fmr_pool(ib_conn->fmr_pool); 220 221 if (ib_conn->qp != NULL) 222 rdma_destroy_qp(ib_conn->cma_id); 223 224 if (ib_conn->cma_id != NULL) 225 rdma_destroy_id(ib_conn->cma_id); 226 227 ib_conn->fmr_pool = NULL; 228 ib_conn->qp = NULL; 229 ib_conn->cma_id = NULL; 230 kfree(ib_conn->page_vec); 231 232 return 0; 233 } 234 235 /** 236 * based on the resolved device node GUID see if there already allocated 237 * device for this device. If there's no such, create one. 238 */ 239 static 240 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 241 { 242 struct list_head *p_list; 243 struct iser_device *device = NULL; 244 245 mutex_lock(&ig.device_list_mutex); 246 247 p_list = ig.device_list.next; 248 while (p_list != &ig.device_list) { 249 device = list_entry(p_list, struct iser_device, ig_list); 250 /* find if there's a match using the node GUID */ 251 if (device->ib_device->node_guid == cma_id->device->node_guid) 252 break; 253 } 254 255 if (device == NULL) { 256 device = kzalloc(sizeof *device, GFP_KERNEL); 257 if (device == NULL) 258 goto out; 259 /* assign this device to the device */ 260 device->ib_device = cma_id->device; 261 /* init the device and link it into ig device list */ 262 if (iser_create_device_ib_res(device)) { 263 kfree(device); 264 device = NULL; 265 goto out; 266 } 267 list_add(&device->ig_list, &ig.device_list); 268 } 269 out: 270 BUG_ON(device == NULL); 271 device->refcount++; 272 mutex_unlock(&ig.device_list_mutex); 273 return device; 274 } 275 276 /* if there's no demand for this device, release it */ 277 static void iser_device_try_release(struct iser_device *device) 278 { 279 mutex_lock(&ig.device_list_mutex); 280 device->refcount--; 281 iser_err("device %p refcount %d\n",device,device->refcount); 282 if (!device->refcount) { 283 iser_free_device_ib_res(device); 284 list_del(&device->ig_list); 285 kfree(device); 286 } 287 mutex_unlock(&ig.device_list_mutex); 288 } 289 290 int iser_conn_state_comp(struct iser_conn *ib_conn, 291 enum iser_ib_conn_state comp) 292 { 293 int ret; 294 295 spin_lock_bh(&ib_conn->lock); 296 ret = (ib_conn->state == comp); 297 spin_unlock_bh(&ib_conn->lock); 298 return ret; 299 } 300 301 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 302 enum iser_ib_conn_state comp, 303 enum iser_ib_conn_state exch) 304 { 305 int ret; 306 307 spin_lock_bh(&ib_conn->lock); 308 if ((ret = (ib_conn->state == comp))) 309 ib_conn->state = exch; 310 spin_unlock_bh(&ib_conn->lock); 311 return ret; 312 } 313 314 /** 315 * triggers start of the disconnect procedures and wait for them to be done 316 */ 317 void iser_conn_terminate(struct iser_conn *ib_conn) 318 { 319 int err = 0; 320 321 /* change the ib conn state only if the conn is UP, however always call 322 * rdma_disconnect since this is the only way to cause the CMA to change 323 * the QP state to ERROR 324 */ 325 326 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 327 err = rdma_disconnect(ib_conn->cma_id); 328 if (err) 329 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 330 ib_conn,err); 331 332 wait_event_interruptible(ib_conn->wait, 333 ib_conn->state == ISER_CONN_DOWN); 334 335 iser_conn_release(ib_conn); 336 } 337 338 static void iser_connect_error(struct rdma_cm_id *cma_id) 339 { 340 struct iser_conn *ib_conn; 341 ib_conn = (struct iser_conn *)cma_id->context; 342 343 ib_conn->state = ISER_CONN_DOWN; 344 wake_up_interruptible(&ib_conn->wait); 345 } 346 347 static void iser_addr_handler(struct rdma_cm_id *cma_id) 348 { 349 struct iser_device *device; 350 struct iser_conn *ib_conn; 351 int ret; 352 353 device = iser_device_find_by_ib_device(cma_id); 354 ib_conn = (struct iser_conn *)cma_id->context; 355 ib_conn->device = device; 356 357 ret = rdma_resolve_route(cma_id, 1000); 358 if (ret) { 359 iser_err("resolve route failed: %d\n", ret); 360 iser_connect_error(cma_id); 361 } 362 return; 363 } 364 365 static void iser_route_handler(struct rdma_cm_id *cma_id) 366 { 367 struct rdma_conn_param conn_param; 368 int ret; 369 370 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 371 if (ret) 372 goto failure; 373 374 iser_dbg("path.mtu is %d setting it to %d\n", 375 cma_id->route.path_rec->mtu, IB_MTU_1024); 376 377 /* we must set the MTU to 1024 as this is what the target is assuming */ 378 if (cma_id->route.path_rec->mtu > IB_MTU_1024) 379 cma_id->route.path_rec->mtu = IB_MTU_1024; 380 381 memset(&conn_param, 0, sizeof conn_param); 382 conn_param.responder_resources = 4; 383 conn_param.initiator_depth = 1; 384 conn_param.retry_count = 7; 385 conn_param.rnr_retry_count = 6; 386 387 ret = rdma_connect(cma_id, &conn_param); 388 if (ret) { 389 iser_err("failure connecting: %d\n", ret); 390 goto failure; 391 } 392 393 return; 394 failure: 395 iser_connect_error(cma_id); 396 } 397 398 static void iser_connected_handler(struct rdma_cm_id *cma_id) 399 { 400 struct iser_conn *ib_conn; 401 402 ib_conn = (struct iser_conn *)cma_id->context; 403 ib_conn->state = ISER_CONN_UP; 404 wake_up_interruptible(&ib_conn->wait); 405 } 406 407 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 408 { 409 struct iser_conn *ib_conn; 410 411 ib_conn = (struct iser_conn *)cma_id->context; 412 ib_conn->disc_evt_flag = 1; 413 414 /* getting here when the state is UP means that the conn is being * 415 * terminated asynchronously from the iSCSI layer's perspective. */ 416 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 417 ISER_CONN_TERMINATING)) 418 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 419 ISCSI_ERR_CONN_FAILED); 420 421 /* Complete the termination process if no posts are pending */ 422 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && 423 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 424 ib_conn->state = ISER_CONN_DOWN; 425 wake_up_interruptible(&ib_conn->wait); 426 } 427 } 428 429 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 430 { 431 int ret = 0; 432 433 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); 434 435 switch (event->event) { 436 case RDMA_CM_EVENT_ADDR_RESOLVED: 437 iser_addr_handler(cma_id); 438 break; 439 case RDMA_CM_EVENT_ROUTE_RESOLVED: 440 iser_route_handler(cma_id); 441 break; 442 case RDMA_CM_EVENT_ESTABLISHED: 443 iser_connected_handler(cma_id); 444 break; 445 case RDMA_CM_EVENT_ADDR_ERROR: 446 case RDMA_CM_EVENT_ROUTE_ERROR: 447 case RDMA_CM_EVENT_CONNECT_ERROR: 448 case RDMA_CM_EVENT_UNREACHABLE: 449 case RDMA_CM_EVENT_REJECTED: 450 iser_err("event: %d, error: %d\n", event->event, event->status); 451 iser_connect_error(cma_id); 452 break; 453 case RDMA_CM_EVENT_DISCONNECTED: 454 iser_disconnected_handler(cma_id); 455 break; 456 case RDMA_CM_EVENT_DEVICE_REMOVAL: 457 BUG(); 458 break; 459 case RDMA_CM_EVENT_CONNECT_RESPONSE: 460 BUG(); 461 break; 462 case RDMA_CM_EVENT_CONNECT_REQUEST: 463 default: 464 break; 465 } 466 return ret; 467 } 468 469 int iser_conn_init(struct iser_conn **ibconn) 470 { 471 struct iser_conn *ib_conn; 472 473 ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL); 474 if (!ib_conn) { 475 iser_err("can't alloc memory for struct iser_conn\n"); 476 return -ENOMEM; 477 } 478 ib_conn->state = ISER_CONN_INIT; 479 init_waitqueue_head(&ib_conn->wait); 480 atomic_set(&ib_conn->post_recv_buf_count, 0); 481 atomic_set(&ib_conn->post_send_buf_count, 0); 482 INIT_WORK(&ib_conn->comperror_work, iser_comp_error_worker, 483 ib_conn); 484 INIT_LIST_HEAD(&ib_conn->conn_list); 485 spin_lock_init(&ib_conn->lock); 486 487 *ibconn = ib_conn; 488 return 0; 489 } 490 491 /** 492 * starts the process of connecting to the target 493 * sleeps untill the connection is established or rejected 494 */ 495 int iser_connect(struct iser_conn *ib_conn, 496 struct sockaddr_in *src_addr, 497 struct sockaddr_in *dst_addr, 498 int non_blocking) 499 { 500 struct sockaddr *src, *dst; 501 int err = 0; 502 503 sprintf(ib_conn->name,"%d.%d.%d.%d:%d", 504 NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port); 505 506 /* the device is known only --after-- address resolution */ 507 ib_conn->device = NULL; 508 509 iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n", 510 NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port); 511 512 ib_conn->state = ISER_CONN_PENDING; 513 514 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 515 (void *)ib_conn, 516 RDMA_PS_TCP); 517 if (IS_ERR(ib_conn->cma_id)) { 518 err = PTR_ERR(ib_conn->cma_id); 519 iser_err("rdma_create_id failed: %d\n", err); 520 goto id_failure; 521 } 522 523 src = (struct sockaddr *)src_addr; 524 dst = (struct sockaddr *)dst_addr; 525 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 526 if (err) { 527 iser_err("rdma_resolve_addr failed: %d\n", err); 528 goto addr_failure; 529 } 530 531 if (!non_blocking) { 532 wait_event_interruptible(ib_conn->wait, 533 (ib_conn->state != ISER_CONN_PENDING)); 534 535 if (ib_conn->state != ISER_CONN_UP) { 536 err = -EIO; 537 goto connect_failure; 538 } 539 } 540 541 mutex_lock(&ig.connlist_mutex); 542 list_add(&ib_conn->conn_list, &ig.connlist); 543 mutex_unlock(&ig.connlist_mutex); 544 return 0; 545 546 id_failure: 547 ib_conn->cma_id = NULL; 548 addr_failure: 549 ib_conn->state = ISER_CONN_DOWN; 550 connect_failure: 551 iser_conn_release(ib_conn); 552 return err; 553 } 554 555 /** 556 * Frees all conn objects and deallocs conn descriptor 557 */ 558 void iser_conn_release(struct iser_conn *ib_conn) 559 { 560 struct iser_device *device = ib_conn->device; 561 562 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 563 564 mutex_lock(&ig.connlist_mutex); 565 list_del(&ib_conn->conn_list); 566 mutex_unlock(&ig.connlist_mutex); 567 568 iser_free_ib_conn_res(ib_conn); 569 ib_conn->device = NULL; 570 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 571 if (device != NULL) 572 iser_device_try_release(device); 573 kfree(ib_conn); 574 } 575 576 577 /** 578 * iser_reg_page_vec - Register physical memory 579 * 580 * returns: 0 on success, errno code on failure 581 */ 582 int iser_reg_page_vec(struct iser_conn *ib_conn, 583 struct iser_page_vec *page_vec, 584 struct iser_mem_reg *mem_reg) 585 { 586 struct ib_pool_fmr *mem; 587 u64 io_addr; 588 u64 *page_list; 589 int status; 590 591 page_list = page_vec->pages; 592 io_addr = page_list[0]; 593 594 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 595 page_list, 596 page_vec->length, 597 &io_addr); 598 599 if (IS_ERR(mem)) { 600 status = (int)PTR_ERR(mem); 601 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 602 return status; 603 } 604 605 mem_reg->lkey = mem->fmr->lkey; 606 mem_reg->rkey = mem->fmr->rkey; 607 mem_reg->len = page_vec->length * PAGE_SIZE; 608 mem_reg->va = io_addr; 609 mem_reg->mem_h = (void *)mem; 610 611 mem_reg->va += page_vec->offset; 612 mem_reg->len = page_vec->data_size; 613 614 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 615 "entry[0]: (0x%08lx,%ld)] -> " 616 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 617 page_vec, page_vec->length, 618 (unsigned long)page_vec->pages[0], 619 (unsigned long)page_vec->data_size, 620 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 621 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 622 return 0; 623 } 624 625 /** 626 * Unregister (previosuly registered) memory. 627 */ 628 void iser_unreg_mem(struct iser_mem_reg *reg) 629 { 630 int ret; 631 632 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 633 634 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 635 if (ret) 636 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 637 638 reg->mem_h = NULL; 639 } 640 641 /** 642 * iser_dto_to_iov - builds IOV from a dto descriptor 643 */ 644 static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) 645 { 646 int i; 647 struct ib_sge *sge; 648 struct iser_regd_buf *regd_buf; 649 650 if (dto->regd_vector_len > iov_len) { 651 iser_err("iov size %d too small for posting dto of len %d\n", 652 iov_len, dto->regd_vector_len); 653 BUG(); 654 } 655 656 for (i = 0; i < dto->regd_vector_len; i++) { 657 sge = &iov[i]; 658 regd_buf = dto->regd[i]; 659 660 sge->addr = regd_buf->reg.va; 661 sge->length = regd_buf->reg.len; 662 sge->lkey = regd_buf->reg.lkey; 663 664 if (dto->used_sz[i] > 0) /* Adjust size */ 665 sge->length = dto->used_sz[i]; 666 667 /* offset and length should not exceed the regd buf length */ 668 if (sge->length + dto->offset[i] > regd_buf->reg.len) { 669 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" 670 "%ld in dto:0x%p [%d], va:0x%08lX\n", 671 (unsigned long)sge->length, dto->offset[i], 672 (unsigned long)regd_buf->reg.len, dto, i, 673 (unsigned long)sge->addr); 674 BUG(); 675 } 676 677 sge->addr += dto->offset[i]; /* Adjust offset */ 678 } 679 } 680 681 /** 682 * iser_post_recv - Posts a receive buffer. 683 * 684 * returns 0 on success, -1 on failure 685 */ 686 int iser_post_recv(struct iser_desc *rx_desc) 687 { 688 int ib_ret, ret_val = 0; 689 struct ib_recv_wr recv_wr, *recv_wr_failed; 690 struct ib_sge iov[2]; 691 struct iser_conn *ib_conn; 692 struct iser_dto *recv_dto = &rx_desc->dto; 693 694 /* Retrieve conn */ 695 ib_conn = recv_dto->conn->ib_conn; 696 697 iser_dto_to_iov(recv_dto, iov, 2); 698 699 recv_wr.next = NULL; 700 recv_wr.sg_list = iov; 701 recv_wr.num_sge = recv_dto->regd_vector_len; 702 recv_wr.wr_id = (unsigned long)rx_desc; 703 704 atomic_inc(&ib_conn->post_recv_buf_count); 705 ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed); 706 if (ib_ret) { 707 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 708 atomic_dec(&ib_conn->post_recv_buf_count); 709 ret_val = -1; 710 } 711 712 return ret_val; 713 } 714 715 /** 716 * iser_start_send - Initiate a Send DTO operation 717 * 718 * returns 0 on success, -1 on failure 719 */ 720 int iser_post_send(struct iser_desc *tx_desc) 721 { 722 int ib_ret, ret_val = 0; 723 struct ib_send_wr send_wr, *send_wr_failed; 724 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; 725 struct iser_conn *ib_conn; 726 struct iser_dto *dto = &tx_desc->dto; 727 728 ib_conn = dto->conn->ib_conn; 729 730 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); 731 732 send_wr.next = NULL; 733 send_wr.wr_id = (unsigned long)tx_desc; 734 send_wr.sg_list = iov; 735 send_wr.num_sge = dto->regd_vector_len; 736 send_wr.opcode = IB_WR_SEND; 737 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0; 738 739 atomic_inc(&ib_conn->post_send_buf_count); 740 741 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 742 if (ib_ret) { 743 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", 744 dto, dto->regd_vector_len); 745 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 746 atomic_dec(&ib_conn->post_send_buf_count); 747 ret_val = -1; 748 } 749 750 return ret_val; 751 } 752 753 static void iser_comp_error_worker(void *data) 754 { 755 struct iser_conn *ib_conn = data; 756 757 /* getting here when the state is UP means that the conn is being * 758 * terminated asynchronously from the iSCSI layer's perspective. */ 759 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 760 ISER_CONN_TERMINATING)) 761 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 762 ISCSI_ERR_CONN_FAILED); 763 764 /* complete the termination process if disconnect event was delivered * 765 * note there are no more non completed posts to the QP */ 766 if (ib_conn->disc_evt_flag) { 767 ib_conn->state = ISER_CONN_DOWN; 768 wake_up_interruptible(&ib_conn->wait); 769 } 770 } 771 772 static void iser_handle_comp_error(struct iser_desc *desc) 773 { 774 struct iser_dto *dto = &desc->dto; 775 struct iser_conn *ib_conn = dto->conn->ib_conn; 776 777 iser_dto_buffs_release(dto); 778 779 if (desc->type == ISCSI_RX) { 780 kfree(desc->data); 781 kmem_cache_free(ig.desc_cache, desc); 782 atomic_dec(&ib_conn->post_recv_buf_count); 783 } else { /* type is TX control/command/dataout */ 784 if (desc->type == ISCSI_TX_DATAOUT) 785 kmem_cache_free(ig.desc_cache, desc); 786 atomic_dec(&ib_conn->post_send_buf_count); 787 } 788 789 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && 790 atomic_read(&ib_conn->post_send_buf_count) == 0) 791 schedule_work(&ib_conn->comperror_work); 792 } 793 794 static void iser_cq_tasklet_fn(unsigned long data) 795 { 796 struct iser_device *device = (struct iser_device *)data; 797 struct ib_cq *cq = device->cq; 798 struct ib_wc wc; 799 struct iser_desc *desc; 800 unsigned long xfer_len; 801 802 while (ib_poll_cq(cq, 1, &wc) == 1) { 803 desc = (struct iser_desc *) (unsigned long) wc.wr_id; 804 BUG_ON(desc == NULL); 805 806 if (wc.status == IB_WC_SUCCESS) { 807 if (desc->type == ISCSI_RX) { 808 xfer_len = (unsigned long)wc.byte_len; 809 iser_rcv_completion(desc, xfer_len); 810 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ 811 iser_snd_completion(desc); 812 } else { 813 iser_err("comp w. error op %d status %d\n",desc->type,wc.status); 814 iser_handle_comp_error(desc); 815 } 816 } 817 /* #warning "it is assumed here that arming CQ only once its empty" * 818 * " would not cause interrupts to be missed" */ 819 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 820 } 821 822 static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 823 { 824 struct iser_device *device = (struct iser_device *)cq_context; 825 826 tasklet_schedule(&device->cq_tasklet); 827 } 828