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 #include <linux/kernel.h> 34 #include <linux/module.h> 35 #include <linux/delay.h> 36 37 #include "iscsi_iser.h" 38 39 #define ISCSI_ISER_MAX_CONN 8 40 #define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \ 41 ISER_QP_MAX_REQ_DTOS) * \ 42 ISCSI_ISER_MAX_CONN) 43 44 static void iser_cq_tasklet_fn(unsigned long data); 45 static void iser_cq_callback(struct ib_cq *cq, void *cq_context); 46 47 static void iser_cq_event_callback(struct ib_event *cause, void *context) 48 { 49 iser_err("got cq event %d \n", cause->event); 50 } 51 52 static void iser_qp_event_callback(struct ib_event *cause, void *context) 53 { 54 iser_err("got qp event %d\n",cause->event); 55 } 56 57 /** 58 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 59 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 60 * the adapator. 61 * 62 * returns 0 on success, -1 on failure 63 */ 64 static int iser_create_device_ib_res(struct iser_device *device) 65 { 66 device->pd = ib_alloc_pd(device->ib_device); 67 if (IS_ERR(device->pd)) 68 goto pd_err; 69 70 device->cq = ib_create_cq(device->ib_device, 71 iser_cq_callback, 72 iser_cq_event_callback, 73 (void *)device, 74 ISER_MAX_CQ_LEN, 0); 75 if (IS_ERR(device->cq)) 76 goto cq_err; 77 78 if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP)) 79 goto cq_arm_err; 80 81 tasklet_init(&device->cq_tasklet, 82 iser_cq_tasklet_fn, 83 (unsigned long)device); 84 85 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 86 IB_ACCESS_REMOTE_WRITE | 87 IB_ACCESS_REMOTE_READ); 88 if (IS_ERR(device->mr)) 89 goto dma_mr_err; 90 91 return 0; 92 93 dma_mr_err: 94 tasklet_kill(&device->cq_tasklet); 95 cq_arm_err: 96 ib_destroy_cq(device->cq); 97 cq_err: 98 ib_dealloc_pd(device->pd); 99 pd_err: 100 iser_err("failed to allocate an IB resource\n"); 101 return -1; 102 } 103 104 /** 105 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 106 * CQ and PD created with the device associated with the adapator. 107 */ 108 static void iser_free_device_ib_res(struct iser_device *device) 109 { 110 BUG_ON(device->mr == NULL); 111 112 tasklet_kill(&device->cq_tasklet); 113 114 (void)ib_dereg_mr(device->mr); 115 (void)ib_destroy_cq(device->cq); 116 (void)ib_dealloc_pd(device->pd); 117 118 device->mr = NULL; 119 device->cq = NULL; 120 device->pd = NULL; 121 } 122 123 /** 124 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 125 * 126 * returns 0 on success, -1 on failure 127 */ 128 static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 129 { 130 struct iser_device *device; 131 struct ib_qp_init_attr init_attr; 132 int ret; 133 struct ib_fmr_pool_param params; 134 135 BUG_ON(ib_conn->device == NULL); 136 137 device = ib_conn->device; 138 139 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 140 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 141 GFP_KERNEL); 142 if (!ib_conn->page_vec) { 143 ret = -ENOMEM; 144 goto alloc_err; 145 } 146 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 147 148 params.page_shift = SHIFT_4K; 149 /* when the first/last SG element are not start/end * 150 * page aligned, the map whould be of N+1 pages */ 151 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 152 /* make the pool size twice the max number of SCSI commands * 153 * the ML is expected to queue, watermark for unmap at 50% */ 154 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 155 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 156 params.cache = 0; 157 params.flush_function = NULL; 158 params.access = (IB_ACCESS_LOCAL_WRITE | 159 IB_ACCESS_REMOTE_WRITE | 160 IB_ACCESS_REMOTE_READ); 161 162 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 163 if (IS_ERR(ib_conn->fmr_pool)) { 164 ret = PTR_ERR(ib_conn->fmr_pool); 165 goto fmr_pool_err; 166 } 167 168 memset(&init_attr, 0, sizeof init_attr); 169 170 init_attr.event_handler = iser_qp_event_callback; 171 init_attr.qp_context = (void *)ib_conn; 172 init_attr.send_cq = device->cq; 173 init_attr.recv_cq = device->cq; 174 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 175 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 176 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; 177 init_attr.cap.max_recv_sge = 2; 178 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 179 init_attr.qp_type = IB_QPT_RC; 180 181 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 182 if (ret) 183 goto qp_err; 184 185 ib_conn->qp = ib_conn->cma_id->qp; 186 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 187 ib_conn, ib_conn->cma_id, 188 ib_conn->fmr_pool, ib_conn->cma_id->qp); 189 return ret; 190 191 qp_err: 192 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); 193 fmr_pool_err: 194 kfree(ib_conn->page_vec); 195 alloc_err: 196 iser_err("unable to alloc mem or create resource, err %d\n", ret); 197 return ret; 198 } 199 200 /** 201 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 202 * -1 on failure 203 */ 204 static int iser_free_ib_conn_res(struct iser_conn *ib_conn) 205 { 206 BUG_ON(ib_conn == NULL); 207 208 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 209 ib_conn, ib_conn->cma_id, 210 ib_conn->fmr_pool, ib_conn->qp); 211 212 /* qp is created only once both addr & route are resolved */ 213 if (ib_conn->fmr_pool != NULL) 214 ib_destroy_fmr_pool(ib_conn->fmr_pool); 215 216 if (ib_conn->qp != NULL) 217 rdma_destroy_qp(ib_conn->cma_id); 218 219 if (ib_conn->cma_id != NULL) 220 rdma_destroy_id(ib_conn->cma_id); 221 222 ib_conn->fmr_pool = NULL; 223 ib_conn->qp = NULL; 224 ib_conn->cma_id = NULL; 225 kfree(ib_conn->page_vec); 226 227 return 0; 228 } 229 230 /** 231 * based on the resolved device node GUID see if there already allocated 232 * device for this device. If there's no such, create one. 233 */ 234 static 235 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 236 { 237 struct iser_device *device; 238 239 mutex_lock(&ig.device_list_mutex); 240 241 list_for_each_entry(device, &ig.device_list, ig_list) 242 /* find if there's a match using the node GUID */ 243 if (device->ib_device->node_guid == cma_id->device->node_guid) 244 goto inc_refcnt; 245 246 device = kzalloc(sizeof *device, GFP_KERNEL); 247 if (device == NULL) 248 goto out; 249 250 /* assign this device to the device */ 251 device->ib_device = cma_id->device; 252 /* init the device and link it into ig device list */ 253 if (iser_create_device_ib_res(device)) { 254 kfree(device); 255 device = NULL; 256 goto out; 257 } 258 list_add(&device->ig_list, &ig.device_list); 259 260 inc_refcnt: 261 device->refcount++; 262 out: 263 mutex_unlock(&ig.device_list_mutex); 264 return device; 265 } 266 267 /* if there's no demand for this device, release it */ 268 static void iser_device_try_release(struct iser_device *device) 269 { 270 mutex_lock(&ig.device_list_mutex); 271 device->refcount--; 272 iser_err("device %p refcount %d\n",device,device->refcount); 273 if (!device->refcount) { 274 iser_free_device_ib_res(device); 275 list_del(&device->ig_list); 276 kfree(device); 277 } 278 mutex_unlock(&ig.device_list_mutex); 279 } 280 281 int iser_conn_state_comp(struct iser_conn *ib_conn, 282 enum iser_ib_conn_state comp) 283 { 284 int ret; 285 286 spin_lock_bh(&ib_conn->lock); 287 ret = (ib_conn->state == comp); 288 spin_unlock_bh(&ib_conn->lock); 289 return ret; 290 } 291 292 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 293 enum iser_ib_conn_state comp, 294 enum iser_ib_conn_state exch) 295 { 296 int ret; 297 298 spin_lock_bh(&ib_conn->lock); 299 if ((ret = (ib_conn->state == comp))) 300 ib_conn->state = exch; 301 spin_unlock_bh(&ib_conn->lock); 302 return ret; 303 } 304 305 /** 306 * Frees all conn objects and deallocs conn descriptor 307 */ 308 static void iser_conn_release(struct iser_conn *ib_conn) 309 { 310 struct iser_device *device = ib_conn->device; 311 312 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 313 314 mutex_lock(&ig.connlist_mutex); 315 list_del(&ib_conn->conn_list); 316 mutex_unlock(&ig.connlist_mutex); 317 318 iser_free_ib_conn_res(ib_conn); 319 ib_conn->device = NULL; 320 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 321 if (device != NULL) 322 iser_device_try_release(device); 323 if (ib_conn->iser_conn) 324 ib_conn->iser_conn->ib_conn = NULL; 325 iscsi_destroy_endpoint(ib_conn->ep); 326 } 327 328 void iser_conn_get(struct iser_conn *ib_conn) 329 { 330 atomic_inc(&ib_conn->refcount); 331 } 332 333 void iser_conn_put(struct iser_conn *ib_conn) 334 { 335 if (atomic_dec_and_test(&ib_conn->refcount)) 336 iser_conn_release(ib_conn); 337 } 338 339 /** 340 * triggers start of the disconnect procedures and wait for them to be done 341 */ 342 void iser_conn_terminate(struct iser_conn *ib_conn) 343 { 344 int err = 0; 345 346 /* change the ib conn state only if the conn is UP, however always call 347 * rdma_disconnect since this is the only way to cause the CMA to change 348 * the QP state to ERROR 349 */ 350 351 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 352 err = rdma_disconnect(ib_conn->cma_id); 353 if (err) 354 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 355 ib_conn,err); 356 357 wait_event_interruptible(ib_conn->wait, 358 ib_conn->state == ISER_CONN_DOWN); 359 360 iser_conn_put(ib_conn); 361 } 362 363 static void iser_connect_error(struct rdma_cm_id *cma_id) 364 { 365 struct iser_conn *ib_conn; 366 ib_conn = (struct iser_conn *)cma_id->context; 367 368 ib_conn->state = ISER_CONN_DOWN; 369 wake_up_interruptible(&ib_conn->wait); 370 } 371 372 static void iser_addr_handler(struct rdma_cm_id *cma_id) 373 { 374 struct iser_device *device; 375 struct iser_conn *ib_conn; 376 int ret; 377 378 device = iser_device_find_by_ib_device(cma_id); 379 if (!device) { 380 iser_err("device lookup/creation failed\n"); 381 iser_connect_error(cma_id); 382 return; 383 } 384 385 ib_conn = (struct iser_conn *)cma_id->context; 386 ib_conn->device = device; 387 388 ret = rdma_resolve_route(cma_id, 1000); 389 if (ret) { 390 iser_err("resolve route failed: %d\n", ret); 391 iser_connect_error(cma_id); 392 } 393 } 394 395 static void iser_route_handler(struct rdma_cm_id *cma_id) 396 { 397 struct rdma_conn_param conn_param; 398 int ret; 399 400 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 401 if (ret) 402 goto failure; 403 404 iser_dbg("path.mtu is %d setting it to %d\n", 405 cma_id->route.path_rec->mtu, IB_MTU_1024); 406 407 /* we must set the MTU to 1024 as this is what the target is assuming */ 408 if (cma_id->route.path_rec->mtu > IB_MTU_1024) 409 cma_id->route.path_rec->mtu = IB_MTU_1024; 410 411 memset(&conn_param, 0, sizeof conn_param); 412 conn_param.responder_resources = 4; 413 conn_param.initiator_depth = 1; 414 conn_param.retry_count = 7; 415 conn_param.rnr_retry_count = 6; 416 417 ret = rdma_connect(cma_id, &conn_param); 418 if (ret) { 419 iser_err("failure connecting: %d\n", ret); 420 goto failure; 421 } 422 423 return; 424 failure: 425 iser_connect_error(cma_id); 426 } 427 428 static void iser_connected_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->state = ISER_CONN_UP; 434 wake_up_interruptible(&ib_conn->wait); 435 } 436 437 static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 438 { 439 struct iser_conn *ib_conn; 440 441 ib_conn = (struct iser_conn *)cma_id->context; 442 ib_conn->disc_evt_flag = 1; 443 444 /* getting here when the state is UP means that the conn is being * 445 * terminated asynchronously from the iSCSI layer's perspective. */ 446 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 447 ISER_CONN_TERMINATING)) 448 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 449 ISCSI_ERR_CONN_FAILED); 450 451 /* Complete the termination process if no posts are pending */ 452 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && 453 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 454 ib_conn->state = ISER_CONN_DOWN; 455 wake_up_interruptible(&ib_conn->wait); 456 } 457 } 458 459 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 460 { 461 int ret = 0; 462 463 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); 464 465 switch (event->event) { 466 case RDMA_CM_EVENT_ADDR_RESOLVED: 467 iser_addr_handler(cma_id); 468 break; 469 case RDMA_CM_EVENT_ROUTE_RESOLVED: 470 iser_route_handler(cma_id); 471 break; 472 case RDMA_CM_EVENT_ESTABLISHED: 473 iser_connected_handler(cma_id); 474 break; 475 case RDMA_CM_EVENT_ADDR_ERROR: 476 case RDMA_CM_EVENT_ROUTE_ERROR: 477 case RDMA_CM_EVENT_CONNECT_ERROR: 478 case RDMA_CM_EVENT_UNREACHABLE: 479 case RDMA_CM_EVENT_REJECTED: 480 iser_err("event: %d, error: %d\n", event->event, event->status); 481 iser_connect_error(cma_id); 482 break; 483 case RDMA_CM_EVENT_DISCONNECTED: 484 case RDMA_CM_EVENT_DEVICE_REMOVAL: 485 case RDMA_CM_EVENT_ADDR_CHANGE: 486 iser_disconnected_handler(cma_id); 487 break; 488 default: 489 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 490 break; 491 } 492 return ret; 493 } 494 495 void iser_conn_init(struct iser_conn *ib_conn) 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 atomic_set(&ib_conn->refcount, 1); 502 INIT_LIST_HEAD(&ib_conn->conn_list); 503 spin_lock_init(&ib_conn->lock); 504 } 505 506 /** 507 * starts the process of connecting to the target 508 * sleeps untill the connection is established or rejected 509 */ 510 int iser_connect(struct iser_conn *ib_conn, 511 struct sockaddr_in *src_addr, 512 struct sockaddr_in *dst_addr, 513 int non_blocking) 514 { 515 struct sockaddr *src, *dst; 516 int err = 0; 517 518 sprintf(ib_conn->name,"%d.%d.%d.%d:%d", 519 NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port); 520 521 /* the device is known only --after-- address resolution */ 522 ib_conn->device = NULL; 523 524 iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n", 525 NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port); 526 527 ib_conn->state = ISER_CONN_PENDING; 528 529 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 530 (void *)ib_conn, 531 RDMA_PS_TCP); 532 if (IS_ERR(ib_conn->cma_id)) { 533 err = PTR_ERR(ib_conn->cma_id); 534 iser_err("rdma_create_id failed: %d\n", err); 535 goto id_failure; 536 } 537 538 src = (struct sockaddr *)src_addr; 539 dst = (struct sockaddr *)dst_addr; 540 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 541 if (err) { 542 iser_err("rdma_resolve_addr failed: %d\n", err); 543 goto addr_failure; 544 } 545 546 if (!non_blocking) { 547 wait_event_interruptible(ib_conn->wait, 548 (ib_conn->state != ISER_CONN_PENDING)); 549 550 if (ib_conn->state != ISER_CONN_UP) { 551 err = -EIO; 552 goto connect_failure; 553 } 554 } 555 556 mutex_lock(&ig.connlist_mutex); 557 list_add(&ib_conn->conn_list, &ig.connlist); 558 mutex_unlock(&ig.connlist_mutex); 559 return 0; 560 561 id_failure: 562 ib_conn->cma_id = NULL; 563 addr_failure: 564 ib_conn->state = ISER_CONN_DOWN; 565 connect_failure: 566 iser_conn_release(ib_conn); 567 return err; 568 } 569 570 /** 571 * iser_reg_page_vec - Register physical memory 572 * 573 * returns: 0 on success, errno code on failure 574 */ 575 int iser_reg_page_vec(struct iser_conn *ib_conn, 576 struct iser_page_vec *page_vec, 577 struct iser_mem_reg *mem_reg) 578 { 579 struct ib_pool_fmr *mem; 580 u64 io_addr; 581 u64 *page_list; 582 int status; 583 584 page_list = page_vec->pages; 585 io_addr = page_list[0]; 586 587 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 588 page_list, 589 page_vec->length, 590 io_addr); 591 592 if (IS_ERR(mem)) { 593 status = (int)PTR_ERR(mem); 594 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 595 return status; 596 } 597 598 mem_reg->lkey = mem->fmr->lkey; 599 mem_reg->rkey = mem->fmr->rkey; 600 mem_reg->len = page_vec->length * SIZE_4K; 601 mem_reg->va = io_addr; 602 mem_reg->is_fmr = 1; 603 mem_reg->mem_h = (void *)mem; 604 605 mem_reg->va += page_vec->offset; 606 mem_reg->len = page_vec->data_size; 607 608 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 609 "entry[0]: (0x%08lx,%ld)] -> " 610 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 611 page_vec, page_vec->length, 612 (unsigned long)page_vec->pages[0], 613 (unsigned long)page_vec->data_size, 614 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 615 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 616 return 0; 617 } 618 619 /** 620 * Unregister (previosuly registered) memory. 621 */ 622 void iser_unreg_mem(struct iser_mem_reg *reg) 623 { 624 int ret; 625 626 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 627 628 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 629 if (ret) 630 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 631 632 reg->mem_h = NULL; 633 } 634 635 /** 636 * iser_dto_to_iov - builds IOV from a dto descriptor 637 */ 638 static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) 639 { 640 int i; 641 struct ib_sge *sge; 642 struct iser_regd_buf *regd_buf; 643 644 if (dto->regd_vector_len > iov_len) { 645 iser_err("iov size %d too small for posting dto of len %d\n", 646 iov_len, dto->regd_vector_len); 647 BUG(); 648 } 649 650 for (i = 0; i < dto->regd_vector_len; i++) { 651 sge = &iov[i]; 652 regd_buf = dto->regd[i]; 653 654 sge->addr = regd_buf->reg.va; 655 sge->length = regd_buf->reg.len; 656 sge->lkey = regd_buf->reg.lkey; 657 658 if (dto->used_sz[i] > 0) /* Adjust size */ 659 sge->length = dto->used_sz[i]; 660 661 /* offset and length should not exceed the regd buf length */ 662 if (sge->length + dto->offset[i] > regd_buf->reg.len) { 663 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" 664 "%ld in dto:0x%p [%d], va:0x%08lX\n", 665 (unsigned long)sge->length, dto->offset[i], 666 (unsigned long)regd_buf->reg.len, dto, i, 667 (unsigned long)sge->addr); 668 BUG(); 669 } 670 671 sge->addr += dto->offset[i]; /* Adjust offset */ 672 } 673 } 674 675 /** 676 * iser_post_recv - Posts a receive buffer. 677 * 678 * returns 0 on success, -1 on failure 679 */ 680 int iser_post_recv(struct iser_desc *rx_desc) 681 { 682 int ib_ret, ret_val = 0; 683 struct ib_recv_wr recv_wr, *recv_wr_failed; 684 struct ib_sge iov[2]; 685 struct iser_conn *ib_conn; 686 struct iser_dto *recv_dto = &rx_desc->dto; 687 688 /* Retrieve conn */ 689 ib_conn = recv_dto->ib_conn; 690 691 iser_dto_to_iov(recv_dto, iov, 2); 692 693 recv_wr.next = NULL; 694 recv_wr.sg_list = iov; 695 recv_wr.num_sge = recv_dto->regd_vector_len; 696 recv_wr.wr_id = (unsigned long)rx_desc; 697 698 atomic_inc(&ib_conn->post_recv_buf_count); 699 ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed); 700 if (ib_ret) { 701 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 702 atomic_dec(&ib_conn->post_recv_buf_count); 703 ret_val = -1; 704 } 705 706 return ret_val; 707 } 708 709 /** 710 * iser_start_send - Initiate a Send DTO operation 711 * 712 * returns 0 on success, -1 on failure 713 */ 714 int iser_post_send(struct iser_desc *tx_desc) 715 { 716 int ib_ret, ret_val = 0; 717 struct ib_send_wr send_wr, *send_wr_failed; 718 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; 719 struct iser_conn *ib_conn; 720 struct iser_dto *dto = &tx_desc->dto; 721 722 ib_conn = dto->ib_conn; 723 724 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); 725 726 send_wr.next = NULL; 727 send_wr.wr_id = (unsigned long)tx_desc; 728 send_wr.sg_list = iov; 729 send_wr.num_sge = dto->regd_vector_len; 730 send_wr.opcode = IB_WR_SEND; 731 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0; 732 733 atomic_inc(&ib_conn->post_send_buf_count); 734 735 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 736 if (ib_ret) { 737 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", 738 dto, dto->regd_vector_len); 739 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 740 atomic_dec(&ib_conn->post_send_buf_count); 741 ret_val = -1; 742 } 743 744 return ret_val; 745 } 746 747 static void iser_handle_comp_error(struct iser_desc *desc) 748 { 749 struct iser_dto *dto = &desc->dto; 750 struct iser_conn *ib_conn = dto->ib_conn; 751 752 iser_dto_buffs_release(dto); 753 754 if (desc->type == ISCSI_RX) { 755 kfree(desc->data); 756 kmem_cache_free(ig.desc_cache, desc); 757 atomic_dec(&ib_conn->post_recv_buf_count); 758 } else { /* type is TX control/command/dataout */ 759 if (desc->type == ISCSI_TX_DATAOUT) 760 kmem_cache_free(ig.desc_cache, desc); 761 atomic_dec(&ib_conn->post_send_buf_count); 762 } 763 764 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && 765 atomic_read(&ib_conn->post_send_buf_count) == 0) { 766 /* getting here when the state is UP means that the conn is * 767 * being terminated asynchronously from the iSCSI layer's * 768 * perspective. */ 769 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 770 ISER_CONN_TERMINATING)) 771 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 772 ISCSI_ERR_CONN_FAILED); 773 774 /* complete the termination process if disconnect event was delivered * 775 * note there are no more non completed posts to the QP */ 776 if (ib_conn->disc_evt_flag) { 777 ib_conn->state = ISER_CONN_DOWN; 778 wake_up_interruptible(&ib_conn->wait); 779 } 780 } 781 } 782 783 static void iser_cq_tasklet_fn(unsigned long data) 784 { 785 struct iser_device *device = (struct iser_device *)data; 786 struct ib_cq *cq = device->cq; 787 struct ib_wc wc; 788 struct iser_desc *desc; 789 unsigned long xfer_len; 790 791 while (ib_poll_cq(cq, 1, &wc) == 1) { 792 desc = (struct iser_desc *) (unsigned long) wc.wr_id; 793 BUG_ON(desc == NULL); 794 795 if (wc.status == IB_WC_SUCCESS) { 796 if (desc->type == ISCSI_RX) { 797 xfer_len = (unsigned long)wc.byte_len; 798 iser_rcv_completion(desc, xfer_len); 799 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ 800 iser_snd_completion(desc); 801 } else { 802 iser_err("comp w. error op %d status %d\n",desc->type,wc.status); 803 iser_handle_comp_error(desc); 804 } 805 } 806 /* #warning "it is assumed here that arming CQ only once its empty" * 807 * " would not cause interrupts to be missed" */ 808 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 809 } 810 811 static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 812 { 813 struct iser_device *device = (struct iser_device *)cq_context; 814 815 tasklet_schedule(&device->cq_tasklet); 816 } 817