iser_verbs.c revision bcc60c381d857ced653e912cbe6121294773e147
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 44static void iser_cq_tasklet_fn(unsigned long data); 45static void iser_cq_callback(struct ib_cq *cq, void *cq_context); 46 47static void iser_cq_event_callback(struct ib_event *cause, void *context) 48{ 49 iser_err("got cq event %d \n", cause->event); 50} 51 52static 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 */ 64static 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 93dma_mr_err: 94 tasklet_kill(&device->cq_tasklet); 95cq_arm_err: 96 ib_destroy_cq(device->cq); 97cq_err: 98 ib_dealloc_pd(device->pd); 99pd_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 */ 108static 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 */ 128static 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 = -ENOMEM; 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->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 140 if (!ib_conn->login_buf) { 141 goto alloc_err; 142 ret = -ENOMEM; 143 } 144 145 ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, 146 (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, 147 DMA_FROM_DEVICE); 148 149 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 150 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 151 GFP_KERNEL); 152 if (!ib_conn->page_vec) { 153 ret = -ENOMEM; 154 goto alloc_err; 155 } 156 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 157 158 params.page_shift = SHIFT_4K; 159 /* when the first/last SG element are not start/end * 160 * page aligned, the map whould be of N+1 pages */ 161 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 162 /* make the pool size twice the max number of SCSI commands * 163 * the ML is expected to queue, watermark for unmap at 50% */ 164 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 165 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 166 params.cache = 0; 167 params.flush_function = NULL; 168 params.access = (IB_ACCESS_LOCAL_WRITE | 169 IB_ACCESS_REMOTE_WRITE | 170 IB_ACCESS_REMOTE_READ); 171 172 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 173 if (IS_ERR(ib_conn->fmr_pool)) { 174 ret = PTR_ERR(ib_conn->fmr_pool); 175 goto fmr_pool_err; 176 } 177 178 memset(&init_attr, 0, sizeof init_attr); 179 180 init_attr.event_handler = iser_qp_event_callback; 181 init_attr.qp_context = (void *)ib_conn; 182 init_attr.send_cq = device->cq; 183 init_attr.recv_cq = device->cq; 184 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 185 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 186 init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN; 187 init_attr.cap.max_recv_sge = 1; 188 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 189 init_attr.qp_type = IB_QPT_RC; 190 191 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 192 if (ret) 193 goto qp_err; 194 195 ib_conn->qp = ib_conn->cma_id->qp; 196 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 197 ib_conn, ib_conn->cma_id, 198 ib_conn->fmr_pool, ib_conn->cma_id->qp); 199 return ret; 200 201qp_err: 202 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); 203fmr_pool_err: 204 kfree(ib_conn->page_vec); 205 kfree(ib_conn->login_buf); 206alloc_err: 207 iser_err("unable to alloc mem or create resource, err %d\n", ret); 208 return ret; 209} 210 211/** 212 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 213 * -1 on failure 214 */ 215static int iser_free_ib_conn_res(struct iser_conn *ib_conn) 216{ 217 BUG_ON(ib_conn == NULL); 218 219 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 220 ib_conn, ib_conn->cma_id, 221 ib_conn->fmr_pool, ib_conn->qp); 222 223 /* qp is created only once both addr & route are resolved */ 224 if (ib_conn->fmr_pool != NULL) 225 ib_destroy_fmr_pool(ib_conn->fmr_pool); 226 227 if (ib_conn->qp != NULL) 228 rdma_destroy_qp(ib_conn->cma_id); 229 230 if (ib_conn->cma_id != NULL) 231 rdma_destroy_id(ib_conn->cma_id); 232 233 ib_conn->fmr_pool = NULL; 234 ib_conn->qp = NULL; 235 ib_conn->cma_id = NULL; 236 kfree(ib_conn->page_vec); 237 238 return 0; 239} 240 241/** 242 * based on the resolved device node GUID see if there already allocated 243 * device for this device. If there's no such, create one. 244 */ 245static 246struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 247{ 248 struct iser_device *device; 249 250 mutex_lock(&ig.device_list_mutex); 251 252 list_for_each_entry(device, &ig.device_list, ig_list) 253 /* find if there's a match using the node GUID */ 254 if (device->ib_device->node_guid == cma_id->device->node_guid) 255 goto inc_refcnt; 256 257 device = kzalloc(sizeof *device, GFP_KERNEL); 258 if (device == NULL) 259 goto out; 260 261 /* assign this device to the device */ 262 device->ib_device = cma_id->device; 263 /* init the device and link it into ig device list */ 264 if (iser_create_device_ib_res(device)) { 265 kfree(device); 266 device = NULL; 267 goto out; 268 } 269 list_add(&device->ig_list, &ig.device_list); 270 271inc_refcnt: 272 device->refcount++; 273out: 274 mutex_unlock(&ig.device_list_mutex); 275 return device; 276} 277 278/* if there's no demand for this device, release it */ 279static void iser_device_try_release(struct iser_device *device) 280{ 281 mutex_lock(&ig.device_list_mutex); 282 device->refcount--; 283 iser_err("device %p refcount %d\n",device,device->refcount); 284 if (!device->refcount) { 285 iser_free_device_ib_res(device); 286 list_del(&device->ig_list); 287 kfree(device); 288 } 289 mutex_unlock(&ig.device_list_mutex); 290} 291 292int iser_conn_state_comp(struct iser_conn *ib_conn, 293 enum iser_ib_conn_state comp) 294{ 295 int ret; 296 297 spin_lock_bh(&ib_conn->lock); 298 ret = (ib_conn->state == comp); 299 spin_unlock_bh(&ib_conn->lock); 300 return ret; 301} 302 303static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 304 enum iser_ib_conn_state comp, 305 enum iser_ib_conn_state exch) 306{ 307 int ret; 308 309 spin_lock_bh(&ib_conn->lock); 310 if ((ret = (ib_conn->state == comp))) 311 ib_conn->state = exch; 312 spin_unlock_bh(&ib_conn->lock); 313 return ret; 314} 315 316/** 317 * Frees all conn objects and deallocs conn descriptor 318 */ 319static void iser_conn_release(struct iser_conn *ib_conn) 320{ 321 struct iser_device *device = ib_conn->device; 322 323 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 324 325 mutex_lock(&ig.connlist_mutex); 326 list_del(&ib_conn->conn_list); 327 mutex_unlock(&ig.connlist_mutex); 328 iser_free_rx_descriptors(ib_conn); 329 iser_free_ib_conn_res(ib_conn); 330 ib_conn->device = NULL; 331 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 332 if (device != NULL) 333 iser_device_try_release(device); 334 if (ib_conn->iser_conn) 335 ib_conn->iser_conn->ib_conn = NULL; 336 iscsi_destroy_endpoint(ib_conn->ep); 337} 338 339void iser_conn_get(struct iser_conn *ib_conn) 340{ 341 atomic_inc(&ib_conn->refcount); 342} 343 344void iser_conn_put(struct iser_conn *ib_conn) 345{ 346 if (atomic_dec_and_test(&ib_conn->refcount)) 347 iser_conn_release(ib_conn); 348} 349 350/** 351 * triggers start of the disconnect procedures and wait for them to be done 352 */ 353void iser_conn_terminate(struct iser_conn *ib_conn) 354{ 355 int err = 0; 356 357 /* change the ib conn state only if the conn is UP, however always call 358 * rdma_disconnect since this is the only way to cause the CMA to change 359 * the QP state to ERROR 360 */ 361 362 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 363 err = rdma_disconnect(ib_conn->cma_id); 364 if (err) 365 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 366 ib_conn,err); 367 368 wait_event_interruptible(ib_conn->wait, 369 ib_conn->state == ISER_CONN_DOWN); 370 371 iser_conn_put(ib_conn); 372} 373 374static void iser_connect_error(struct rdma_cm_id *cma_id) 375{ 376 struct iser_conn *ib_conn; 377 ib_conn = (struct iser_conn *)cma_id->context; 378 379 ib_conn->state = ISER_CONN_DOWN; 380 wake_up_interruptible(&ib_conn->wait); 381} 382 383static void iser_addr_handler(struct rdma_cm_id *cma_id) 384{ 385 struct iser_device *device; 386 struct iser_conn *ib_conn; 387 int ret; 388 389 device = iser_device_find_by_ib_device(cma_id); 390 if (!device) { 391 iser_err("device lookup/creation failed\n"); 392 iser_connect_error(cma_id); 393 return; 394 } 395 396 ib_conn = (struct iser_conn *)cma_id->context; 397 ib_conn->device = device; 398 399 ret = rdma_resolve_route(cma_id, 1000); 400 if (ret) { 401 iser_err("resolve route failed: %d\n", ret); 402 iser_connect_error(cma_id); 403 } 404} 405 406static void iser_route_handler(struct rdma_cm_id *cma_id) 407{ 408 struct rdma_conn_param conn_param; 409 int ret; 410 411 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 412 if (ret) 413 goto failure; 414 415 memset(&conn_param, 0, sizeof conn_param); 416 conn_param.responder_resources = 4; 417 conn_param.initiator_depth = 1; 418 conn_param.retry_count = 7; 419 conn_param.rnr_retry_count = 6; 420 421 ret = rdma_connect(cma_id, &conn_param); 422 if (ret) { 423 iser_err("failure connecting: %d\n", ret); 424 goto failure; 425 } 426 427 return; 428failure: 429 iser_connect_error(cma_id); 430} 431 432static void iser_connected_handler(struct rdma_cm_id *cma_id) 433{ 434 struct iser_conn *ib_conn; 435 436 ib_conn = (struct iser_conn *)cma_id->context; 437 ib_conn->state = ISER_CONN_UP; 438 wake_up_interruptible(&ib_conn->wait); 439} 440 441static void iser_disconnected_handler(struct rdma_cm_id *cma_id) 442{ 443 struct iser_conn *ib_conn; 444 445 ib_conn = (struct iser_conn *)cma_id->context; 446 ib_conn->disc_evt_flag = 1; 447 448 /* getting here when the state is UP means that the conn is being * 449 * terminated asynchronously from the iSCSI layer's perspective. */ 450 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 451 ISER_CONN_TERMINATING)) 452 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 453 ISCSI_ERR_CONN_FAILED); 454 455 /* Complete the termination process if no posts are pending */ 456 if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) && 457 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 458 ib_conn->state = ISER_CONN_DOWN; 459 wake_up_interruptible(&ib_conn->wait); 460 } 461} 462 463static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 464{ 465 int ret = 0; 466 467 iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id); 468 469 switch (event->event) { 470 case RDMA_CM_EVENT_ADDR_RESOLVED: 471 iser_addr_handler(cma_id); 472 break; 473 case RDMA_CM_EVENT_ROUTE_RESOLVED: 474 iser_route_handler(cma_id); 475 break; 476 case RDMA_CM_EVENT_ESTABLISHED: 477 iser_connected_handler(cma_id); 478 break; 479 case RDMA_CM_EVENT_ADDR_ERROR: 480 case RDMA_CM_EVENT_ROUTE_ERROR: 481 case RDMA_CM_EVENT_CONNECT_ERROR: 482 case RDMA_CM_EVENT_UNREACHABLE: 483 case RDMA_CM_EVENT_REJECTED: 484 iser_err("event: %d, error: %d\n", event->event, event->status); 485 iser_connect_error(cma_id); 486 break; 487 case RDMA_CM_EVENT_DISCONNECTED: 488 case RDMA_CM_EVENT_DEVICE_REMOVAL: 489 case RDMA_CM_EVENT_ADDR_CHANGE: 490 iser_disconnected_handler(cma_id); 491 break; 492 default: 493 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 494 break; 495 } 496 return ret; 497} 498 499void iser_conn_init(struct iser_conn *ib_conn) 500{ 501 ib_conn->state = ISER_CONN_INIT; 502 init_waitqueue_head(&ib_conn->wait); 503 atomic_set(&ib_conn->post_recv_buf_count, 0); 504 atomic_set(&ib_conn->post_send_buf_count, 0); 505 atomic_set(&ib_conn->refcount, 1); 506 INIT_LIST_HEAD(&ib_conn->conn_list); 507 spin_lock_init(&ib_conn->lock); 508} 509 510 /** 511 * starts the process of connecting to the target 512 * sleeps until the connection is established or rejected 513 */ 514int iser_connect(struct iser_conn *ib_conn, 515 struct sockaddr_in *src_addr, 516 struct sockaddr_in *dst_addr, 517 int non_blocking) 518{ 519 struct sockaddr *src, *dst; 520 int err = 0; 521 522 sprintf(ib_conn->name, "%pI4:%d", 523 &dst_addr->sin_addr.s_addr, dst_addr->sin_port); 524 525 /* the device is known only --after-- address resolution */ 526 ib_conn->device = NULL; 527 528 iser_err("connecting to: %pI4, port 0x%x\n", 529 &dst_addr->sin_addr, dst_addr->sin_port); 530 531 ib_conn->state = ISER_CONN_PENDING; 532 533 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 534 (void *)ib_conn, 535 RDMA_PS_TCP); 536 if (IS_ERR(ib_conn->cma_id)) { 537 err = PTR_ERR(ib_conn->cma_id); 538 iser_err("rdma_create_id failed: %d\n", err); 539 goto id_failure; 540 } 541 542 src = (struct sockaddr *)src_addr; 543 dst = (struct sockaddr *)dst_addr; 544 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 545 if (err) { 546 iser_err("rdma_resolve_addr failed: %d\n", err); 547 goto addr_failure; 548 } 549 550 if (!non_blocking) { 551 wait_event_interruptible(ib_conn->wait, 552 (ib_conn->state != ISER_CONN_PENDING)); 553 554 if (ib_conn->state != ISER_CONN_UP) { 555 err = -EIO; 556 goto connect_failure; 557 } 558 } 559 560 mutex_lock(&ig.connlist_mutex); 561 list_add(&ib_conn->conn_list, &ig.connlist); 562 mutex_unlock(&ig.connlist_mutex); 563 return 0; 564 565id_failure: 566 ib_conn->cma_id = NULL; 567addr_failure: 568 ib_conn->state = ISER_CONN_DOWN; 569connect_failure: 570 iser_conn_release(ib_conn); 571 return err; 572} 573 574/** 575 * iser_reg_page_vec - Register physical memory 576 * 577 * returns: 0 on success, errno code on failure 578 */ 579int iser_reg_page_vec(struct iser_conn *ib_conn, 580 struct iser_page_vec *page_vec, 581 struct iser_mem_reg *mem_reg) 582{ 583 struct ib_pool_fmr *mem; 584 u64 io_addr; 585 u64 *page_list; 586 int status; 587 588 page_list = page_vec->pages; 589 io_addr = page_list[0]; 590 591 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 592 page_list, 593 page_vec->length, 594 io_addr); 595 596 if (IS_ERR(mem)) { 597 status = (int)PTR_ERR(mem); 598 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 599 return status; 600 } 601 602 mem_reg->lkey = mem->fmr->lkey; 603 mem_reg->rkey = mem->fmr->rkey; 604 mem_reg->len = page_vec->length * SIZE_4K; 605 mem_reg->va = io_addr; 606 mem_reg->is_fmr = 1; 607 mem_reg->mem_h = (void *)mem; 608 609 mem_reg->va += page_vec->offset; 610 mem_reg->len = page_vec->data_size; 611 612 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 613 "entry[0]: (0x%08lx,%ld)] -> " 614 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 615 page_vec, page_vec->length, 616 (unsigned long)page_vec->pages[0], 617 (unsigned long)page_vec->data_size, 618 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 619 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 620 return 0; 621} 622 623/** 624 * Unregister (previosuly registered) memory. 625 */ 626void iser_unreg_mem(struct iser_mem_reg *reg) 627{ 628 int ret; 629 630 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 631 632 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 633 if (ret) 634 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 635 636 reg->mem_h = NULL; 637} 638 639int iser_post_recvl(struct iser_conn *ib_conn) 640{ 641 struct ib_recv_wr rx_wr, *rx_wr_failed; 642 struct ib_sge sge; 643 int ib_ret; 644 645 sge.addr = ib_conn->login_dma; 646 sge.length = ISER_RX_LOGIN_SIZE; 647 sge.lkey = ib_conn->device->mr->lkey; 648 649 rx_wr.wr_id = (unsigned long)ib_conn->login_buf; 650 rx_wr.sg_list = &sge; 651 rx_wr.num_sge = 1; 652 rx_wr.next = NULL; 653 654 atomic_inc(&ib_conn->post_recv_buf_count); 655 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); 656 if (ib_ret) { 657 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 658 atomic_dec(&ib_conn->post_recv_buf_count); 659 } 660 return ib_ret; 661} 662 663int iser_post_recvm(struct iser_conn *ib_conn, int count) 664{ 665 struct ib_recv_wr *rx_wr, *rx_wr_failed; 666 int i, ib_ret; 667 unsigned int my_rx_head = ib_conn->rx_desc_head; 668 struct iser_rx_desc *rx_desc; 669 670 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 671 rx_desc = &ib_conn->rx_descs[my_rx_head]; 672 rx_wr->wr_id = (unsigned long)rx_desc; 673 rx_wr->sg_list = &rx_desc->rx_sg; 674 rx_wr->num_sge = 1; 675 rx_wr->next = rx_wr + 1; 676 my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); 677 } 678 679 rx_wr--; 680 rx_wr->next = NULL; /* mark end of work requests list */ 681 682 atomic_add(count, &ib_conn->post_recv_buf_count); 683 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); 684 if (ib_ret) { 685 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 686 atomic_sub(count, &ib_conn->post_recv_buf_count); 687 } else 688 ib_conn->rx_desc_head = my_rx_head; 689 return ib_ret; 690} 691 692 693/** 694 * iser_dto_to_iov - builds IOV from a dto descriptor 695 */ 696static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len) 697{ 698 int i; 699 struct ib_sge *sge; 700 struct iser_regd_buf *regd_buf; 701 702 if (dto->regd_vector_len > iov_len) { 703 iser_err("iov size %d too small for posting dto of len %d\n", 704 iov_len, dto->regd_vector_len); 705 BUG(); 706 } 707 708 for (i = 0; i < dto->regd_vector_len; i++) { 709 sge = &iov[i]; 710 regd_buf = dto->regd[i]; 711 712 sge->addr = regd_buf->reg.va; 713 sge->length = regd_buf->reg.len; 714 sge->lkey = regd_buf->reg.lkey; 715 716 if (dto->used_sz[i] > 0) /* Adjust size */ 717 sge->length = dto->used_sz[i]; 718 719 /* offset and length should not exceed the regd buf length */ 720 if (sge->length + dto->offset[i] > regd_buf->reg.len) { 721 iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:" 722 "%ld in dto:0x%p [%d], va:0x%08lX\n", 723 (unsigned long)sge->length, dto->offset[i], 724 (unsigned long)regd_buf->reg.len, dto, i, 725 (unsigned long)sge->addr); 726 BUG(); 727 } 728 729 sge->addr += dto->offset[i]; /* Adjust offset */ 730 } 731} 732 733 734/** 735 * iser_start_send - Initiate a Send DTO operation 736 * 737 * returns 0 on success, -1 on failure 738 */ 739int iser_post_send(struct iser_desc *tx_desc) 740{ 741 int ib_ret, ret_val = 0; 742 struct ib_send_wr send_wr, *send_wr_failed; 743 struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN]; 744 struct iser_conn *ib_conn; 745 struct iser_dto *dto = &tx_desc->dto; 746 747 ib_conn = dto->ib_conn; 748 749 iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN); 750 751 send_wr.next = NULL; 752 send_wr.wr_id = (unsigned long)tx_desc; 753 send_wr.sg_list = iov; 754 send_wr.num_sge = dto->regd_vector_len; 755 send_wr.opcode = IB_WR_SEND; 756 send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0; 757 758 atomic_inc(&ib_conn->post_send_buf_count); 759 760 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 761 if (ib_ret) { 762 iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n", 763 dto, dto->regd_vector_len); 764 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 765 atomic_dec(&ib_conn->post_send_buf_count); 766 ret_val = -1; 767 } 768 769 return ret_val; 770} 771 772static void iser_handle_comp_error(struct iser_desc *desc, 773 struct iser_conn *ib_conn) 774{ 775 struct iser_rx_desc *rx = (struct iser_rx_desc *)desc; 776 struct iser_rx_desc *rx_first = ib_conn->rx_descs; 777 struct iser_rx_desc *rx_last = rx_first + (ISER_QP_MAX_RECV_DTOS - 1); 778 779 if ((char *)desc == ib_conn->login_buf || 780 (rx_first <= rx && rx <= rx_last)) 781 atomic_dec(&ib_conn->post_recv_buf_count); 782 else { /* type is TX control/command/dataout */ 783 if (desc->type == ISCSI_TX_DATAOUT) 784 kmem_cache_free(ig.desc_cache, desc); 785 atomic_dec(&ib_conn->post_send_buf_count); 786 } 787 788 if (atomic_read(&ib_conn->post_recv_buf_count) == 0 && 789 atomic_read(&ib_conn->post_send_buf_count) == 0) { 790 /* getting here when the state is UP means that the conn is * 791 * being terminated asynchronously from the iSCSI layer's * 792 * perspective. */ 793 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 794 ISER_CONN_TERMINATING)) 795 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 796 ISCSI_ERR_CONN_FAILED); 797 798 /* complete the termination process if disconnect event was delivered * 799 * note there are no more non completed posts to the QP */ 800 if (ib_conn->disc_evt_flag) { 801 ib_conn->state = ISER_CONN_DOWN; 802 wake_up_interruptible(&ib_conn->wait); 803 } 804 } 805} 806 807static void iser_cq_tasklet_fn(unsigned long data) 808{ 809 struct iser_device *device = (struct iser_device *)data; 810 struct ib_cq *cq = device->cq; 811 struct ib_wc wc; 812 struct iser_desc *desc; 813 unsigned long xfer_len; 814 struct iser_conn *ib_conn; 815 816 while (ib_poll_cq(cq, 1, &wc) == 1) { 817 desc = (struct iser_desc *) (unsigned long) wc.wr_id; 818 BUG_ON(desc == NULL); 819 ib_conn = wc.qp->qp_context; 820 821 if (wc.status == IB_WC_SUCCESS) { 822 if (wc.opcode == IB_WC_RECV) { 823 xfer_len = (unsigned long)wc.byte_len; 824 iser_rcv_completion((struct iser_rx_desc *)desc, 825 xfer_len, ib_conn); 826 } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */ 827 iser_snd_completion(desc); 828 } else { 829 if (wc.status != IB_WC_WR_FLUSH_ERR) 830 iser_err("id %llx status %d vend_err %x\n", 831 wc.wr_id, wc.status, wc.vendor_err); 832 iser_handle_comp_error(desc, ib_conn); 833 } 834 } 835 /* #warning "it is assumed here that arming CQ only once its empty" * 836 * " would not cause interrupts to be missed" */ 837 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 838} 839 840static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 841{ 842 struct iser_device *device = (struct iser_device *)cq_context; 843 844 tasklet_schedule(&device->cq_tasklet); 845} 846