iser_verbs.c revision aae3c995ff74a183d15207436d383942485b2edd
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_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) 41#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN) 42 43static void iser_cq_tasklet_fn(unsigned long data); 44static void iser_cq_callback(struct ib_cq *cq, void *cq_context); 45 46static void iser_cq_event_callback(struct ib_event *cause, void *context) 47{ 48 iser_err("got cq event %d \n", cause->event); 49} 50 51static void iser_qp_event_callback(struct ib_event *cause, void *context) 52{ 53 iser_err("got qp event %d\n",cause->event); 54} 55 56/** 57 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 58 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 59 * the adapator. 60 * 61 * returns 0 on success, -1 on failure 62 */ 63static int iser_create_device_ib_res(struct iser_device *device) 64{ 65 device->pd = ib_alloc_pd(device->ib_device); 66 if (IS_ERR(device->pd)) 67 goto pd_err; 68 69 device->rx_cq = ib_create_cq(device->ib_device, 70 iser_cq_callback, 71 iser_cq_event_callback, 72 (void *)device, 73 ISER_MAX_RX_CQ_LEN, 0); 74 if (IS_ERR(device->rx_cq)) 75 goto rx_cq_err; 76 77 device->tx_cq = ib_create_cq(device->ib_device, 78 NULL, iser_cq_event_callback, 79 (void *)device, 80 ISER_MAX_TX_CQ_LEN, 0); 81 82 if (IS_ERR(device->tx_cq)) 83 goto tx_cq_err; 84 85 if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) 86 goto cq_arm_err; 87 88 tasklet_init(&device->cq_tasklet, 89 iser_cq_tasklet_fn, 90 (unsigned long)device); 91 92 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 93 IB_ACCESS_REMOTE_WRITE | 94 IB_ACCESS_REMOTE_READ); 95 if (IS_ERR(device->mr)) 96 goto dma_mr_err; 97 98 return 0; 99 100dma_mr_err: 101 tasklet_kill(&device->cq_tasklet); 102cq_arm_err: 103 ib_destroy_cq(device->tx_cq); 104tx_cq_err: 105 ib_destroy_cq(device->rx_cq); 106rx_cq_err: 107 ib_dealloc_pd(device->pd); 108pd_err: 109 iser_err("failed to allocate an IB resource\n"); 110 return -1; 111} 112 113/** 114 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 115 * CQ and PD created with the device associated with the adapator. 116 */ 117static void iser_free_device_ib_res(struct iser_device *device) 118{ 119 BUG_ON(device->mr == NULL); 120 121 tasklet_kill(&device->cq_tasklet); 122 123 (void)ib_dereg_mr(device->mr); 124 (void)ib_destroy_cq(device->tx_cq); 125 (void)ib_destroy_cq(device->rx_cq); 126 (void)ib_dealloc_pd(device->pd); 127 128 device->mr = NULL; 129 device->tx_cq = NULL; 130 device->rx_cq = NULL; 131 device->pd = NULL; 132} 133 134/** 135 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 136 * 137 * returns 0 on success, -1 on failure 138 */ 139static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 140{ 141 struct iser_device *device; 142 struct ib_qp_init_attr init_attr; 143 int ret = -ENOMEM; 144 struct ib_fmr_pool_param params; 145 146 BUG_ON(ib_conn->device == NULL); 147 148 device = ib_conn->device; 149 150 ib_conn->login_buf = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); 151 if (!ib_conn->login_buf) { 152 goto alloc_err; 153 ret = -ENOMEM; 154 } 155 156 ib_conn->login_dma = ib_dma_map_single(ib_conn->device->ib_device, 157 (void *)ib_conn->login_buf, ISER_RX_LOGIN_SIZE, 158 DMA_FROM_DEVICE); 159 160 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 161 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 162 GFP_KERNEL); 163 if (!ib_conn->page_vec) { 164 ret = -ENOMEM; 165 goto alloc_err; 166 } 167 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 168 169 params.page_shift = SHIFT_4K; 170 /* when the first/last SG element are not start/end * 171 * page aligned, the map whould be of N+1 pages */ 172 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 173 /* make the pool size twice the max number of SCSI commands * 174 * the ML is expected to queue, watermark for unmap at 50% */ 175 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 176 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 177 params.cache = 0; 178 params.flush_function = NULL; 179 params.access = (IB_ACCESS_LOCAL_WRITE | 180 IB_ACCESS_REMOTE_WRITE | 181 IB_ACCESS_REMOTE_READ); 182 183 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 184 if (IS_ERR(ib_conn->fmr_pool)) { 185 ret = PTR_ERR(ib_conn->fmr_pool); 186 goto fmr_pool_err; 187 } 188 189 memset(&init_attr, 0, sizeof init_attr); 190 191 init_attr.event_handler = iser_qp_event_callback; 192 init_attr.qp_context = (void *)ib_conn; 193 init_attr.send_cq = device->tx_cq; 194 init_attr.recv_cq = device->rx_cq; 195 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 196 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 197 init_attr.cap.max_send_sge = 2; 198 init_attr.cap.max_recv_sge = 1; 199 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 200 init_attr.qp_type = IB_QPT_RC; 201 202 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 203 if (ret) 204 goto qp_err; 205 206 ib_conn->qp = ib_conn->cma_id->qp; 207 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 208 ib_conn, ib_conn->cma_id, 209 ib_conn->fmr_pool, ib_conn->cma_id->qp); 210 return ret; 211 212qp_err: 213 (void)ib_destroy_fmr_pool(ib_conn->fmr_pool); 214fmr_pool_err: 215 kfree(ib_conn->page_vec); 216 kfree(ib_conn->login_buf); 217alloc_err: 218 iser_err("unable to alloc mem or create resource, err %d\n", ret); 219 return ret; 220} 221 222/** 223 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 224 * -1 on failure 225 */ 226static int iser_free_ib_conn_res(struct iser_conn *ib_conn) 227{ 228 BUG_ON(ib_conn == NULL); 229 230 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 231 ib_conn, ib_conn->cma_id, 232 ib_conn->fmr_pool, ib_conn->qp); 233 234 /* qp is created only once both addr & route are resolved */ 235 if (ib_conn->fmr_pool != NULL) 236 ib_destroy_fmr_pool(ib_conn->fmr_pool); 237 238 if (ib_conn->qp != NULL) 239 rdma_destroy_qp(ib_conn->cma_id); 240 241 if (ib_conn->cma_id != NULL) 242 rdma_destroy_id(ib_conn->cma_id); 243 244 ib_conn->fmr_pool = NULL; 245 ib_conn->qp = NULL; 246 ib_conn->cma_id = NULL; 247 kfree(ib_conn->page_vec); 248 249 return 0; 250} 251 252/** 253 * based on the resolved device node GUID see if there already allocated 254 * device for this device. If there's no such, create one. 255 */ 256static 257struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 258{ 259 struct iser_device *device; 260 261 mutex_lock(&ig.device_list_mutex); 262 263 list_for_each_entry(device, &ig.device_list, ig_list) 264 /* find if there's a match using the node GUID */ 265 if (device->ib_device->node_guid == cma_id->device->node_guid) 266 goto inc_refcnt; 267 268 device = kzalloc(sizeof *device, GFP_KERNEL); 269 if (device == NULL) 270 goto out; 271 272 /* assign this device to the device */ 273 device->ib_device = cma_id->device; 274 /* init the device and link it into ig device list */ 275 if (iser_create_device_ib_res(device)) { 276 kfree(device); 277 device = NULL; 278 goto out; 279 } 280 list_add(&device->ig_list, &ig.device_list); 281 282inc_refcnt: 283 device->refcount++; 284out: 285 mutex_unlock(&ig.device_list_mutex); 286 return device; 287} 288 289/* if there's no demand for this device, release it */ 290static void iser_device_try_release(struct iser_device *device) 291{ 292 mutex_lock(&ig.device_list_mutex); 293 device->refcount--; 294 iser_err("device %p refcount %d\n",device,device->refcount); 295 if (!device->refcount) { 296 iser_free_device_ib_res(device); 297 list_del(&device->ig_list); 298 kfree(device); 299 } 300 mutex_unlock(&ig.device_list_mutex); 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 (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 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 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 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 ib_conn->post_recv_buf_count += 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 ib_conn->post_recv_buf_count -= count; 687 } else 688 ib_conn->rx_desc_head = my_rx_head; 689 return ib_ret; 690} 691 692 693/** 694 * iser_start_send - Initiate a Send DTO operation 695 * 696 * returns 0 on success, -1 on failure 697 */ 698int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) 699{ 700 int ib_ret; 701 struct ib_send_wr send_wr, *send_wr_failed; 702 703 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 704 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 705 706 send_wr.next = NULL; 707 send_wr.wr_id = (unsigned long)tx_desc; 708 send_wr.sg_list = tx_desc->tx_sg; 709 send_wr.num_sge = tx_desc->num_sge; 710 send_wr.opcode = IB_WR_SEND; 711 send_wr.send_flags = IB_SEND_SIGNALED; 712 713 atomic_inc(&ib_conn->post_send_buf_count); 714 715 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 716 if (ib_ret) { 717 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 718 atomic_dec(&ib_conn->post_send_buf_count); 719 } 720 return ib_ret; 721} 722 723static void iser_handle_comp_error(struct iser_tx_desc *desc, 724 struct iser_conn *ib_conn) 725{ 726 if (desc && desc->type == ISCSI_TX_DATAOUT) 727 kmem_cache_free(ig.desc_cache, desc); 728 729 if (ib_conn->post_recv_buf_count == 0 && 730 atomic_read(&ib_conn->post_send_buf_count) == 0) { 731 /* getting here when the state is UP means that the conn is * 732 * being terminated asynchronously from the iSCSI layer's * 733 * perspective. */ 734 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 735 ISER_CONN_TERMINATING)) 736 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 737 ISCSI_ERR_CONN_FAILED); 738 739 /* complete the termination process if disconnect event was delivered * 740 * note there are no more non completed posts to the QP */ 741 if (ib_conn->disc_evt_flag) { 742 ib_conn->state = ISER_CONN_DOWN; 743 wake_up_interruptible(&ib_conn->wait); 744 } 745 } 746} 747 748static int iser_drain_tx_cq(struct iser_device *device) 749{ 750 struct ib_cq *cq = device->tx_cq; 751 struct ib_wc wc; 752 struct iser_tx_desc *tx_desc; 753 struct iser_conn *ib_conn; 754 int completed_tx = 0; 755 756 while (ib_poll_cq(cq, 1, &wc) == 1) { 757 tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; 758 ib_conn = wc.qp->qp_context; 759 if (wc.status == IB_WC_SUCCESS) { 760 if (wc.opcode == IB_WC_SEND) 761 iser_snd_completion(tx_desc, ib_conn); 762 else 763 iser_err("expected opcode %d got %d\n", 764 IB_WC_SEND, wc.opcode); 765 } else { 766 iser_err("tx id %llx status %d vend_err %x\n", 767 wc.wr_id, wc.status, wc.vendor_err); 768 atomic_dec(&ib_conn->post_send_buf_count); 769 iser_handle_comp_error(tx_desc, ib_conn); 770 } 771 completed_tx++; 772 } 773 return completed_tx; 774} 775 776 777static void iser_cq_tasklet_fn(unsigned long data) 778{ 779 struct iser_device *device = (struct iser_device *)data; 780 struct ib_cq *cq = device->rx_cq; 781 struct ib_wc wc; 782 struct iser_rx_desc *desc; 783 unsigned long xfer_len; 784 struct iser_conn *ib_conn; 785 int completed_tx, completed_rx; 786 completed_tx = completed_rx = 0; 787 788 while (ib_poll_cq(cq, 1, &wc) == 1) { 789 desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; 790 BUG_ON(desc == NULL); 791 ib_conn = wc.qp->qp_context; 792 if (wc.status == IB_WC_SUCCESS) { 793 if (wc.opcode == IB_WC_RECV) { 794 xfer_len = (unsigned long)wc.byte_len; 795 iser_rcv_completion(desc, xfer_len, ib_conn); 796 } else 797 iser_err("expected opcode %d got %d\n", 798 IB_WC_RECV, wc.opcode); 799 } else { 800 if (wc.status != IB_WC_WR_FLUSH_ERR) 801 iser_err("rx id %llx status %d vend_err %x\n", 802 wc.wr_id, wc.status, wc.vendor_err); 803 ib_conn->post_recv_buf_count--; 804 iser_handle_comp_error(NULL, ib_conn); 805 } 806 completed_rx++; 807 if (!(completed_rx & 63)) 808 completed_tx += iser_drain_tx_cq(device); 809 } 810 /* #warning "it is assumed here that arming CQ only once its empty" * 811 * " would not cause interrupts to be missed" */ 812 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 813 814 completed_tx += iser_drain_tx_cq(device); 815 iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); 816} 817 818static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 819{ 820 struct iser_device *device = (struct iser_device *)cq_context; 821 822 tasklet_schedule(&device->cq_tasklet); 823} 824