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 <linux/kernel.h> 36 #include <linux/module.h> 37 #include <linux/delay.h> 38 #include <linux/version.h> 39 40 #include "iscsi_iser.h" 41 42 #define ISCSI_ISER_MAX_CONN 8 43 #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \ 44 ISER_QP_MAX_REQ_DTOS) * \ 45 ISCSI_ISER_MAX_CONN) 46 47 static void iser_cq_tasklet_fn(unsigned long data); 48 static void iser_cq_callback(struct ib_cq *cq, void *cq_context); 49 50 static void iser_cq_event_callback(struct ib_event *cause, void *context) 51 { 52 iser_err("got cq event %d \n", cause->event); 53 } 54 55 static void iser_qp_event_callback(struct ib_event *cause, void *context) 56 { 57 iser_err("got qp event %d\n",cause->event); 58 } 59 60 /** 61 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 62 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 63 * the adapator. 64 * 65 * returns 0 on success, -1 on failure 66 */ 67 static int iser_create_device_ib_res(struct iser_device *device) 68 { 69 device->pd = ib_alloc_pd(device->ib_device); 70 if (IS_ERR(device->pd)) 71 goto pd_err; 72 73 device->cq = ib_create_cq(device->ib_device, 74 iser_cq_callback, 75 iser_cq_event_callback, 76 (void *)device, 77 ISER_MAX_CQ_LEN, 0); 78 if (IS_ERR(device->cq)) 79 goto cq_err; 80 81 if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP)) 82 goto cq_arm_err; 83 84 tasklet_init(&device->cq_tasklet, 85 iser_cq_tasklet_fn, 86 (unsigned long)device); 87 88 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 89 IB_ACCESS_REMOTE_WRITE | 90 IB_ACCESS_REMOTE_READ); 91 if (IS_ERR(device->mr)) 92 goto dma_mr_err; 93 94 return 0; 95 96 dma_mr_err: 97 tasklet_kill(&device->cq_tasklet); 98 cq_arm_err: 99 ib_destroy_cq(device->cq); 100 cq_err: 101 ib_dealloc_pd(device->pd); 102 pd_err: 103 iser_err("failed to allocate an IB resource\n"); 104 return -1; 105 } 106 107 /** 108 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 109 * CQ and PD created with the device associated with the adapator. 110 */ 111 static void iser_free_device_ib_res(struct iser_device *device) 112 { 113 BUG_ON(device->mr == NULL); 114 115 tasklet_kill(&device->cq_tasklet); 116 117 (void)ib_dereg_mr(device->mr); 118 (void)ib_destroy_cq(device->cq); 119 (void)ib_dealloc_pd(device->pd); 120 121 device->mr = NULL; 122 device->cq = NULL; 123 device->pd = NULL; 124 } 125 126 /** 127 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 128 * 129 * returns 0 on success, -1 on failure 130 */ 131 static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 132 { 133 struct iser_device *device; 134 struct ib_qp_init_attr init_attr; 135 int ret; 136 struct ib_fmr_pool_param params; 137 138 BUG_ON(ib_conn->device == NULL); 139 140 device = ib_conn->device; 141 142 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 143 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 144 GFP_KERNEL); 145 if (!ib_conn->page_vec) { 146 ret = -ENOMEM; 147 goto alloc_err; 148 } 149 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 150 151 params.page_shift = SHIFT_4K; 152 /* when the first/last SG element are not start/end * 153 * page aligned, the map whould be of N+1 pages */ 154 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 155 /* make the pool size twice the max number of SCSI commands * 156 * the ML is expected to queue, watermark for unmap at 50% */ 157 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 158 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 159 params.cache = 0; 160 params.flush_function = NULL; 161 params.access = (IB_ACCESS_LOCAL_WRITE | 162 IB_ACCESS_REMOTE_WRITE | 163 IB_ACCESS_REMOTE_READ); 164 165 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 166 if (IS_ERR(ib_conn->fmr_pool)) { 167 ret = PTR_ERR(ib_conn->fmr_pool); 168 goto fmr_pool_err; 169 } 170 171 memset(&init_attr, 0, sizeof init_attr); 172 173 init_attr.event_handler = iser_qp_event_callback; 174 init_attr.qp_context = (void *)ib_conn; 175 init_attr.send_cq = device->cq; 176 init_attr.recv_cq = device->cq; 177 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 178 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 179 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; 180 init_attr.cap.max_recv_sge = 2; 181 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 182 init_attr.qp_type = IB_QPT_RC; 183 184 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 185 if (ret) 186 goto qp_err; 187 188 ib_conn->qp = ib_conn->cma_id->qp; 189 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 190 ib_conn, ib_conn->cma_id, 191 ib_conn->fmr_pool, ib_conn->cma_id->qp); 192 return ret; 193 194 qp_err: 195 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); 196 fmr_pool_err: 197 kfree(ib_conn->page_vec); 198 alloc_err: 199 iser_err("unable to alloc mem or create resource, err %d\n", ret); 200 return ret; 201 } 202 203 /** 204 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 205 * -1 on failure 206 */ 207 static int iser_free_ib_conn_res(struct iser_conn *ib_conn) 208 { 209 BUG_ON(ib_conn == NULL); 210 211 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 212 ib_conn, ib_conn->cma_id, 213 ib_conn->fmr_pool, ib_conn->qp); 214 215 /* qp is created only once both addr & route are resolved */ 216 if (ib_conn->fmr_pool != NULL) 217 ib_destroy_fmr_pool(ib_conn->fmr_pool); 218 219 if (ib_conn->qp != NULL) 220 rdma_destroy_qp(ib_conn->cma_id); 221 222 if (ib_conn->cma_id != NULL) 223 rdma_destroy_id(ib_conn->cma_id); 224 225 ib_conn->fmr_pool = NULL; 226 ib_conn->qp = NULL; 227 ib_conn->cma_id = NULL; 228 kfree(ib_conn->page_vec); 229 230 return 0; 231 } 232 233 /** 234 * based on the resolved device node GUID see if there already allocated 235 * device for this device. If there's no such, create one. 236 */ 237 static 238 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 239 { 240 struct list_head *p_list; 241 struct iser_device *device = NULL; 242 243 mutex_lock(&ig.device_list_mutex); 244 245 p_list = ig.device_list.next; 246 while (p_list != &ig.device_list) { 247 device = list_entry(p_list, struct iser_device, ig_list); 248 /* find if there's a match using the node GUID */ 249 if (device->ib_device->node_guid == cma_id->device->node_guid) 250 break; 251 } 252 253 if (device == NULL) { 254 device = kzalloc(sizeof *device, GFP_KERNEL); 255 if (device == NULL) 256 goto out; 257 /* assign this device to the device */ 258 device->ib_device = cma_id->device; 259 /* init the device and link it into ig device list */ 260 if (iser_create_device_ib_res(device)) { 261 kfree(device); 262 device = NULL; 263 goto out; 264 } 265 list_add(&device->ig_list, &ig.device_list); 266 } 267 out: 268 BUG_ON(device == NULL); 269 device->refcount++; 270 mutex_unlock(&ig.device_list_mutex); 271 return device; 272 } 273 274 /* if there's no demand for this device, release it */ 275 static void iser_device_try_release(struct iser_device *device) 276 { 277 mutex_lock(&ig.device_list_mutex); 278 device->refcount--; 279 iser_err("device %p refcount %d\n",device,device->refcount); 280 if (!device->refcount) { 281 iser_free_device_ib_res(device); 282 list_del(&device->ig_list); 283 kfree(device); 284 } 285 mutex_unlock(&ig.device_list_mutex); 286 } 287 288 int iser_conn_state_comp(struct iser_conn *ib_conn, 289 enum iser_ib_conn_state comp) 290 { 291 int ret; 292 293 spin_lock_bh(&ib_conn->lock); 294 ret = (ib_conn->state == comp); 295 spin_unlock_bh(&ib_conn->lock); 296 return ret; 297 } 298 299 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 300 enum iser_ib_conn_state comp, 301 enum iser_ib_conn_state exch) 302 { 303 int ret; 304 305 spin_lock_bh(&ib_conn->lock); 306 if ((ret = (ib_conn->state == comp))) 307 ib_conn->state = exch; 308 spin_unlock_bh(&ib_conn->lock); 309 return ret; 310 } 311 312 /** 313 * Frees all conn objects and deallocs conn descriptor 314 */ 315 static void iser_conn_release(struct iser_conn *ib_conn) 316 { 317 struct iser_device *device = ib_conn->device; 318 319 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 320 321 mutex_lock(&ig.connlist_mutex); 322 list_del(&ib_conn->conn_list); 323 mutex_unlock(&ig.connlist_mutex); 324 325 iser_free_ib_conn_res(ib_conn); 326 ib_conn->device = NULL; 327 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 328 if (device != NULL) 329 iser_device_try_release(device); 330 if (ib_conn->iser_conn) 331 ib_conn->iser_conn->ib_conn = NULL; 332 kfree(ib_conn); 333 } 334 335 /** 336 * triggers start of the disconnect procedures and wait for them to be done 337 */ 338 void iser_conn_terminate(struct iser_conn *ib_conn) 339 { 340 int err = 0; 341 342 /* change the ib conn state only if the conn is UP, however always call 343 * rdma_disconnect since this is the only way to cause the CMA to change 344 * the QP state to ERROR 345 */ 346 347 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 348 err = rdma_disconnect(ib_conn->cma_id); 349 if (err) 350 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 351 ib_conn,err); 352 353 wait_event_interruptible(ib_conn->wait, 354 ib_conn->state == ISER_CONN_DOWN); 355 356 iser_conn_release(ib_conn); 357 } 358 359 static void iser_connect_error(struct rdma_cm_id *cma_id) 360 { 361 struct iser_conn *ib_conn; 362 ib_conn = (struct iser_conn *)cma_id->context; 363 364 ib_conn->state = ISER_CONN_DOWN; 365 wake_up_interruptible(&ib_conn->wait); 366 } 367 368 static void iser_addr_handler(struct rdma_cm_id *cma_id) 369 { 370 struct iser_device *device; 371 struct iser_conn *ib_conn; 372 int ret; 373 374 device = iser_device_find_by_ib_device(cma_id); 375 ib_conn = (struct iser_conn *)cma_id->context; 376 ib_conn->device = device; 377 378 ret = rdma_resolve_route(cma_id, 1000); 379 if (ret) { 380 iser_err("resolve route failed: %d\n", ret); 381 iser_connect_error(cma_id); 382 } 383 return; 384 } 385 386 static void iser_route_handler(struct rdma_cm_id *cma_id) 387 { 388 struct rdma_conn_param conn_param; 389 int ret; 390 391 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 392 if (ret) 393 goto failure; 394 395 iser_dbg("path.mtu is %d setting it to %d\n", 396 cma_id->route.path_rec->mtu, IB_MTU_1024); 397 398 /* we must set the MTU to 1024 as this is what the target is assuming */ 399 if (cma_id->route.path_rec->mtu > IB_MTU_1024) 400 cma_id->route.path_rec->mtu = IB_MTU_1024; 401 402 memset(&conn_param, 0, sizeof conn_param); 403 conn_param.responder_resources = 4; 404 conn_param.initiator_depth = 1; 405 conn_param.retry_count = 7; 406 conn_param.rnr_retry_count = 6; 407 408 ret = rdma_connect(cma_id, &conn_param); 409 if (ret) { 410 iser_err("failure connecting: %d\n", ret); 411 goto failure; 412 } 413 414 return; 415 failure: 416 iser_connect_error(cma_id); 417 } 418 419 static void iser_connected_handler(struct rdma_cm_id *cma_id) 420 { 421 struct iser_conn *ib_conn; 422 423 ib_conn = (struct iser_conn *)cma_id->context; 424 ib_conn->state = ISER_CONN_UP; 425 wake_up_interruptible(&ib_conn->wait); 426 } 427 428 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 429 { 430 struct iser_conn *ib_conn; 431 432 ib_conn = (struct iser_conn *)cma_id->context; 433 ib_conn->disc_evt_flag = 1; 434 435 /* getting here when the state is UP means that the conn is being * 436 * terminated asynchronously from the iSCSI layer's perspective. */ 437 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 438 ISER_CONN_TERMINATING)) 439 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 440 ISCSI_ERR_CONN_FAILED); 441 442 /* Complete the termination process if no posts are pending */ 443 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && 444 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 445 ib_conn->state = ISER_CONN_DOWN; 446 wake_up_interruptible(&ib_conn->wait); 447 } 448 } 449 450 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 451 { 452 int ret = 0; 453 454 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); 455 456 switch (event->event) { 457 case RDMA_CM_EVENT_ADDR_RESOLVED: 458 iser_addr_handler(cma_id); 459 break; 460 case RDMA_CM_EVENT_ROUTE_RESOLVED: 461 iser_route_handler(cma_id); 462 break; 463 case RDMA_CM_EVENT_ESTABLISHED: 464 iser_connected_handler(cma_id); 465 break; 466 case RDMA_CM_EVENT_ADDR_ERROR: 467 case RDMA_CM_EVENT_ROUTE_ERROR: 468 case RDMA_CM_EVENT_CONNECT_ERROR: 469 case RDMA_CM_EVENT_UNREACHABLE: 470 case RDMA_CM_EVENT_REJECTED: 471 iser_err("event: %d, error: %d\n", event->event, event->status); 472 iser_connect_error(cma_id); 473 break; 474 case RDMA_CM_EVENT_DISCONNECTED: 475 iser_disconnected_handler(cma_id); 476 break; 477 case RDMA_CM_EVENT_DEVICE_REMOVAL: 478 iser_err("Device removal is currently unsupported\n"); 479 BUG(); 480 break; 481 default: 482 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 483 break; 484 } 485 return ret; 486 } 487 488 int iser_conn_init(struct iser_conn **ibconn) 489 { 490 struct iser_conn *ib_conn; 491 492 ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL); 493 if (!ib_conn) { 494 iser_err("can't alloc memory for struct iser_conn\n"); 495 return -ENOMEM; 496 } 497 ib_conn->state = ISER_CONN_INIT; 498 init_waitqueue_head(&ib_conn->wait); 499 atomic_set(&ib_conn->post_recv_buf_count, 0); 500 atomic_set(&ib_conn->post_send_buf_count, 0); 501 INIT_LIST_HEAD(&ib_conn->conn_list); 502 spin_lock_init(&ib_conn->lock); 503 504 *ibconn = ib_conn; 505 return 0; 506 } 507 508 /** 509 * starts the process of connecting to the target 510 * sleeps untill the connection is established or rejected 511 */ 512 int iser_connect(struct iser_conn *ib_conn, 513 struct sockaddr_in *src_addr, 514 struct sockaddr_in *dst_addr, 515 int non_blocking) 516 { 517 struct sockaddr *src, *dst; 518 int err = 0; 519 520 sprintf(ib_conn->name,"%d.%d.%d.%d:%d", 521 NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port); 522 523 /* the device is known only --after-- address resolution */ 524 ib_conn->device = NULL; 525 526 iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n", 527 NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port); 528 529 ib_conn->state = ISER_CONN_PENDING; 530 531 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 532 (void *)ib_conn, 533 RDMA_PS_TCP); 534 if (IS_ERR(ib_conn->cma_id)) { 535 err = PTR_ERR(ib_conn->cma_id); 536 iser_err("rdma_create_id failed: %d\n", err); 537 goto id_failure; 538 } 539 540 src = (struct sockaddr *)src_addr; 541 dst = (struct sockaddr *)dst_addr; 542 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 543 if (err) { 544 iser_err("rdma_resolve_addr failed: %d\n", err); 545 goto addr_failure; 546 } 547 548 if (!non_blocking) { 549 wait_event_interruptible(ib_conn->wait, 550 (ib_conn->state != ISER_CONN_PENDING)); 551 552 if (ib_conn->state != ISER_CONN_UP) { 553 err = -EIO; 554 goto connect_failure; 555 } 556 } 557 558 mutex_lock(&ig.connlist_mutex); 559 list_add(&ib_conn->conn_list, &ig.connlist); 560 mutex_unlock(&ig.connlist_mutex); 561 return 0; 562 563 id_failure: 564 ib_conn->cma_id = NULL; 565 addr_failure: 566 ib_conn->state = ISER_CONN_DOWN; 567 connect_failure: 568 iser_conn_release(ib_conn); 569 return err; 570 } 571 572 /** 573 * iser_reg_page_vec - Register physical memory 574 * 575 * returns: 0 on success, errno code on failure 576 */ 577 int iser_reg_page_vec(struct iser_conn *ib_conn, 578 struct iser_page_vec *page_vec, 579 struct iser_mem_reg *mem_reg) 580 { 581 struct ib_pool_fmr *mem; 582 u64 io_addr; 583 u64 *page_list; 584 int status; 585 586 page_list = page_vec->pages; 587 io_addr = page_list[0]; 588 589 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 590 page_list, 591 page_vec->length, 592 io_addr); 593 594 if (IS_ERR(mem)) { 595 status = (int)PTR_ERR(mem); 596 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 597 return status; 598 } 599 600 mem_reg->lkey = mem->fmr->lkey; 601 mem_reg->rkey = mem->fmr->rkey; 602 mem_reg->len = page_vec->length * SIZE_4K; 603 mem_reg->va = io_addr; 604 mem_reg->is_fmr = 1; 605 mem_reg->mem_h = (void *)mem; 606 607 mem_reg->va += page_vec->offset; 608 mem_reg->len = page_vec->data_size; 609 610 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 611 "entry[0]: (0x%08lx,%ld)] -> " 612 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 613 page_vec, page_vec->length, 614 (unsigned long)page_vec->pages[0], 615 (unsigned long)page_vec->data_size, 616 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 617 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 618 return 0; 619 } 620 621 /** 622 * Unregister (previosuly registered) memory. 623 */ 624 void iser_unreg_mem(struct iser_mem_reg *reg) 625 { 626 int ret; 627 628 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 629 630 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 631 if (ret) 632 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 633 634 reg->mem_h = NULL; 635 } 636 637 /** 638 * iser_dto_to_iov - builds IOV from a dto descriptor 639 */ 640 static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) 641 { 642 int i; 643 struct ib_sge *sge; 644 struct iser_regd_buf *regd_buf; 645 646 if (dto->regd_vector_len > iov_len) { 647 iser_err("iov size %d too small for posting dto of len %d\n", 648 iov_len, dto->regd_vector_len); 649 BUG(); 650 } 651 652 for (i = 0; i < dto->regd_vector_len; i++) { 653 sge = &iov[i]; 654 regd_buf = dto->regd[i]; 655 656 sge->addr = regd_buf->reg.va; 657 sge->length = regd_buf->reg.len; 658 sge->lkey = regd_buf->reg.lkey; 659 660 if (dto->used_sz[i] > 0) /* Adjust size */ 661 sge->length = dto->used_sz[i]; 662 663 /* offset and length should not exceed the regd buf length */ 664 if (sge->length + dto->offset[i] > regd_buf->reg.len) { 665 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" 666 "%ld in dto:0x%p [%d], va:0x%08lX\n", 667 (unsigned long)sge->length, dto->offset[i], 668 (unsigned long)regd_buf->reg.len, dto, i, 669 (unsigned long)sge->addr); 670 BUG(); 671 } 672 673 sge->addr += dto->offset[i]; /* Adjust offset */ 674 } 675 } 676 677 /** 678 * iser_post_recv - Posts a receive buffer. 679 * 680 * returns 0 on success, -1 on failure 681 */ 682 int iser_post_recv(struct iser_desc *rx_desc) 683 { 684 int ib_ret, ret_val = 0; 685 struct ib_recv_wr recv_wr, *recv_wr_failed; 686 struct ib_sge iov[2]; 687 struct iser_conn *ib_conn; 688 struct iser_dto *recv_dto = &rx_desc->dto; 689 690 /* Retrieve conn */ 691 ib_conn = recv_dto->ib_conn; 692 693 iser_dto_to_iov(recv_dto, iov, 2); 694 695 recv_wr.next = NULL; 696 recv_wr.sg_list = iov; 697 recv_wr.num_sge = recv_dto->regd_vector_len; 698 recv_wr.wr_id = (unsigned long)rx_desc; 699 700 atomic_inc(&ib_conn->post_recv_buf_count); 701 ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed); 702 if (ib_ret) { 703 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 704 atomic_dec(&ib_conn->post_recv_buf_count); 705 ret_val = -1; 706 } 707 708 return ret_val; 709 } 710 711 /** 712 * iser_start_send - Initiate a Send DTO operation 713 * 714 * returns 0 on success, -1 on failure 715 */ 716 int iser_post_send(struct iser_desc *tx_desc) 717 { 718 int ib_ret, ret_val = 0; 719 struct ib_send_wr send_wr, *send_wr_failed; 720 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; 721 struct iser_conn *ib_conn; 722 struct iser_dto *dto = &tx_desc->dto; 723 724 ib_conn = dto->ib_conn; 725 726 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); 727 728 send_wr.next = NULL; 729 send_wr.wr_id = (unsigned long)tx_desc; 730 send_wr.sg_list = iov; 731 send_wr.num_sge = dto->regd_vector_len; 732 send_wr.opcode = IB_WR_SEND; 733 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0; 734 735 atomic_inc(&ib_conn->post_send_buf_count); 736 737 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 738 if (ib_ret) { 739 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", 740 dto, dto->regd_vector_len); 741 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 742 atomic_dec(&ib_conn->post_send_buf_count); 743 ret_val = -1; 744 } 745 746 return ret_val; 747 } 748 749 static void iser_handle_comp_error(struct iser_desc *desc) 750 { 751 struct iser_dto *dto = &desc->dto; 752 struct iser_conn *ib_conn = dto->ib_conn; 753 754 iser_dto_buffs_release(dto); 755 756 if (desc->type == ISCSI_RX) { 757 kfree(desc->data); 758 kmem_cache_free(ig.desc_cache, desc); 759 atomic_dec(&ib_conn->post_recv_buf_count); 760 } else { /* type is TX control/command/dataout */ 761 if (desc->type == ISCSI_TX_DATAOUT) 762 kmem_cache_free(ig.desc_cache, desc); 763 atomic_dec(&ib_conn->post_send_buf_count); 764 } 765 766 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && 767 atomic_read(&ib_conn->post_send_buf_count) == 0) { 768 /* getting here when the state is UP means that the conn is * 769 * being terminated asynchronously from the iSCSI layer's * 770 * perspective. */ 771 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 772 ISER_CONN_TERMINATING)) 773 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 774 ISCSI_ERR_CONN_FAILED); 775 776 /* complete the termination process if disconnect event was delivered * 777 * note there are no more non completed posts to the QP */ 778 if (ib_conn->disc_evt_flag) { 779 ib_conn->state = ISER_CONN_DOWN; 780 wake_up_interruptible(&ib_conn->wait); 781 } 782 } 783 } 784 785 static void iser_cq_tasklet_fn(unsigned long data) 786 { 787 struct iser_device *device = (struct iser_device *)data; 788 struct ib_cq *cq = device->cq; 789 struct ib_wc wc; 790 struct iser_desc *desc; 791 unsigned long xfer_len; 792 793 while (ib_poll_cq(cq, 1, &wc) == 1) { 794 desc = (struct iser_desc *) (unsigned long) wc.wr_id; 795 BUG_ON(desc == NULL); 796 797 if (wc.status == IB_WC_SUCCESS) { 798 if (desc->type == ISCSI_RX) { 799 xfer_len = (unsigned long)wc.byte_len; 800 iser_rcv_completion(desc, xfer_len); 801 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ 802 iser_snd_completion(desc); 803 } else { 804 iser_err("comp w. error op %d status %d\n",desc->type,wc.status); 805 iser_handle_comp_error(desc); 806 } 807 } 808 /* #warning "it is assumed here that arming CQ only once its empty" * 809 * " would not cause interrupts to be missed" */ 810 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 811 } 812 813 static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 814 { 815 struct iser_device *device = (struct iser_device *)cq_context; 816 817 tasklet_schedule(&device->cq_tasklet); 818 } 819