iser_verbs.c revision 2c4ce609347f2a45792c8d9ebb5af11217766cb6
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/slab.h> 36#include <linux/delay.h> 37 38#include "iscsi_iser.h" 39 40#define ISCSI_ISER_MAX_CONN 8 41#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN) 42#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * 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 57static void iser_event_handler(struct ib_event_handler *handler, 58 struct ib_event *event) 59{ 60 iser_err("async event %d on device %s port %d\n", event->event, 61 event->device->name, event->element.port_num); 62} 63 64/** 65 * iser_create_device_ib_res - creates Protection Domain (PD), Completion 66 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with 67 * the adapator. 68 * 69 * returns 0 on success, -1 on failure 70 */ 71static int iser_create_device_ib_res(struct iser_device *device) 72{ 73 device->pd = ib_alloc_pd(device->ib_device); 74 if (IS_ERR(device->pd)) 75 goto pd_err; 76 77 device->rx_cq = ib_create_cq(device->ib_device, 78 iser_cq_callback, 79 iser_cq_event_callback, 80 (void *)device, 81 ISER_MAX_RX_CQ_LEN, 0); 82 if (IS_ERR(device->rx_cq)) 83 goto rx_cq_err; 84 85 device->tx_cq = ib_create_cq(device->ib_device, 86 NULL, iser_cq_event_callback, 87 (void *)device, 88 ISER_MAX_TX_CQ_LEN, 0); 89 90 if (IS_ERR(device->tx_cq)) 91 goto tx_cq_err; 92 93 if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP)) 94 goto cq_arm_err; 95 96 tasklet_init(&device->cq_tasklet, 97 iser_cq_tasklet_fn, 98 (unsigned long)device); 99 100 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 101 IB_ACCESS_REMOTE_WRITE | 102 IB_ACCESS_REMOTE_READ); 103 if (IS_ERR(device->mr)) 104 goto dma_mr_err; 105 106 INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, 107 iser_event_handler); 108 if (ib_register_event_handler(&device->event_handler)) 109 goto handler_err; 110 111 return 0; 112 113handler_err: 114 ib_dereg_mr(device->mr); 115dma_mr_err: 116 tasklet_kill(&device->cq_tasklet); 117cq_arm_err: 118 ib_destroy_cq(device->tx_cq); 119tx_cq_err: 120 ib_destroy_cq(device->rx_cq); 121rx_cq_err: 122 ib_dealloc_pd(device->pd); 123pd_err: 124 iser_err("failed to allocate an IB resource\n"); 125 return -1; 126} 127 128/** 129 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 130 * CQ and PD created with the device associated with the adapator. 131 */ 132static void iser_free_device_ib_res(struct iser_device *device) 133{ 134 BUG_ON(device->mr == NULL); 135 136 tasklet_kill(&device->cq_tasklet); 137 (void)ib_unregister_event_handler(&device->event_handler); 138 (void)ib_dereg_mr(device->mr); 139 (void)ib_destroy_cq(device->tx_cq); 140 (void)ib_destroy_cq(device->rx_cq); 141 (void)ib_dealloc_pd(device->pd); 142 143 device->mr = NULL; 144 device->tx_cq = NULL; 145 device->rx_cq = NULL; 146 device->pd = NULL; 147} 148 149/** 150 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 151 * 152 * returns 0 on success, -1 on failure 153 */ 154static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 155{ 156 struct iser_device *device; 157 struct ib_qp_init_attr init_attr; 158 int req_err, resp_err, ret = -ENOMEM; 159 struct ib_fmr_pool_param params; 160 161 BUG_ON(ib_conn->device == NULL); 162 163 device = ib_conn->device; 164 165 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 166 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 167 if (!ib_conn->login_buf) 168 goto out_err; 169 170 ib_conn->login_req_buf = ib_conn->login_buf; 171 ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN; 172 173 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 174 (void *)ib_conn->login_req_buf, 175 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 176 177 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 178 (void *)ib_conn->login_resp_buf, 179 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 180 181 req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma); 182 resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma); 183 184 if (req_err || resp_err) { 185 if (req_err) 186 ib_conn->login_req_dma = 0; 187 if (resp_err) 188 ib_conn->login_resp_dma = 0; 189 goto out_err; 190 } 191 192 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 193 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 194 GFP_KERNEL); 195 if (!ib_conn->page_vec) 196 goto out_err; 197 198 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 199 200 params.page_shift = SHIFT_4K; 201 /* when the first/last SG element are not start/end * 202 * page aligned, the map whould be of N+1 pages */ 203 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 204 /* make the pool size twice the max number of SCSI commands * 205 * the ML is expected to queue, watermark for unmap at 50% */ 206 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 207 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 208 params.cache = 0; 209 params.flush_function = NULL; 210 params.access = (IB_ACCESS_LOCAL_WRITE | 211 IB_ACCESS_REMOTE_WRITE | 212 IB_ACCESS_REMOTE_READ); 213 214 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 215 if (IS_ERR(ib_conn->fmr_pool)) { 216 ret = PTR_ERR(ib_conn->fmr_pool); 217 ib_conn->fmr_pool = NULL; 218 goto out_err; 219 } 220 221 memset(&init_attr, 0, sizeof init_attr); 222 223 init_attr.event_handler = iser_qp_event_callback; 224 init_attr.qp_context = (void *)ib_conn; 225 init_attr.send_cq = device->tx_cq; 226 init_attr.recv_cq = device->rx_cq; 227 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 228 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 229 init_attr.cap.max_send_sge = 2; 230 init_attr.cap.max_recv_sge = 1; 231 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 232 init_attr.qp_type = IB_QPT_RC; 233 234 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 235 if (ret) 236 goto out_err; 237 238 ib_conn->qp = ib_conn->cma_id->qp; 239 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 240 ib_conn, ib_conn->cma_id, 241 ib_conn->fmr_pool, ib_conn->cma_id->qp); 242 return ret; 243 244out_err: 245 iser_err("unable to alloc mem or create resource, err %d\n", ret); 246 return ret; 247} 248 249/** 250 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 251 * -1 on failure 252 */ 253static int iser_free_ib_conn_res(struct iser_conn *ib_conn, int can_destroy_id) 254{ 255 BUG_ON(ib_conn == NULL); 256 257 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 258 ib_conn, ib_conn->cma_id, 259 ib_conn->fmr_pool, ib_conn->qp); 260 261 /* qp is created only once both addr & route are resolved */ 262 if (ib_conn->fmr_pool != NULL) 263 ib_destroy_fmr_pool(ib_conn->fmr_pool); 264 265 if (ib_conn->qp != NULL) 266 rdma_destroy_qp(ib_conn->cma_id); 267 268 /* if cma handler context, the caller acts s.t the cma destroy the id */ 269 if (ib_conn->cma_id != NULL && can_destroy_id) 270 rdma_destroy_id(ib_conn->cma_id); 271 272 ib_conn->fmr_pool = NULL; 273 ib_conn->qp = NULL; 274 ib_conn->cma_id = NULL; 275 kfree(ib_conn->page_vec); 276 277 return 0; 278} 279 280/** 281 * based on the resolved device node GUID see if there already allocated 282 * device for this device. If there's no such, create one. 283 */ 284static 285struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 286{ 287 struct iser_device *device; 288 289 mutex_lock(&ig.device_list_mutex); 290 291 list_for_each_entry(device, &ig.device_list, ig_list) 292 /* find if there's a match using the node GUID */ 293 if (device->ib_device->node_guid == cma_id->device->node_guid) 294 goto inc_refcnt; 295 296 device = kzalloc(sizeof *device, GFP_KERNEL); 297 if (device == NULL) 298 goto out; 299 300 /* assign this device to the device */ 301 device->ib_device = cma_id->device; 302 /* init the device and link it into ig device list */ 303 if (iser_create_device_ib_res(device)) { 304 kfree(device); 305 device = NULL; 306 goto out; 307 } 308 list_add(&device->ig_list, &ig.device_list); 309 310inc_refcnt: 311 device->refcount++; 312out: 313 mutex_unlock(&ig.device_list_mutex); 314 return device; 315} 316 317/* if there's no demand for this device, release it */ 318static void iser_device_try_release(struct iser_device *device) 319{ 320 mutex_lock(&ig.device_list_mutex); 321 device->refcount--; 322 iser_err("device %p refcount %d\n",device,device->refcount); 323 if (!device->refcount) { 324 iser_free_device_ib_res(device); 325 list_del(&device->ig_list); 326 kfree(device); 327 } 328 mutex_unlock(&ig.device_list_mutex); 329} 330 331static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 332 enum iser_ib_conn_state comp, 333 enum iser_ib_conn_state exch) 334{ 335 int ret; 336 337 spin_lock_bh(&ib_conn->lock); 338 if ((ret = (ib_conn->state == comp))) 339 ib_conn->state = exch; 340 spin_unlock_bh(&ib_conn->lock); 341 return ret; 342} 343 344/** 345 * Frees all conn objects and deallocs conn descriptor 346 */ 347static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id) 348{ 349 struct iser_device *device = ib_conn->device; 350 351 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 352 353 mutex_lock(&ig.connlist_mutex); 354 list_del(&ib_conn->conn_list); 355 mutex_unlock(&ig.connlist_mutex); 356 iser_free_rx_descriptors(ib_conn); 357 iser_free_ib_conn_res(ib_conn, can_destroy_id); 358 ib_conn->device = NULL; 359 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 360 if (device != NULL) 361 iser_device_try_release(device); 362 iscsi_destroy_endpoint(ib_conn->ep); 363} 364 365void iser_conn_get(struct iser_conn *ib_conn) 366{ 367 atomic_inc(&ib_conn->refcount); 368} 369 370int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id) 371{ 372 if (atomic_dec_and_test(&ib_conn->refcount)) { 373 iser_conn_release(ib_conn, can_destroy_id); 374 return 1; 375 } 376 return 0; 377} 378 379/** 380 * triggers start of the disconnect procedures and wait for them to be done 381 */ 382void iser_conn_terminate(struct iser_conn *ib_conn) 383{ 384 int err = 0; 385 386 /* change the ib conn state only if the conn is UP, however always call 387 * rdma_disconnect since this is the only way to cause the CMA to change 388 * the QP state to ERROR 389 */ 390 391 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 392 err = rdma_disconnect(ib_conn->cma_id); 393 if (err) 394 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 395 ib_conn,err); 396 397 wait_event_interruptible(ib_conn->wait, 398 ib_conn->state == ISER_CONN_DOWN); 399 400 iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ 401} 402 403static int iser_connect_error(struct rdma_cm_id *cma_id) 404{ 405 struct iser_conn *ib_conn; 406 ib_conn = (struct iser_conn *)cma_id->context; 407 408 ib_conn->state = ISER_CONN_DOWN; 409 wake_up_interruptible(&ib_conn->wait); 410 return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 411} 412 413static int iser_addr_handler(struct rdma_cm_id *cma_id) 414{ 415 struct iser_device *device; 416 struct iser_conn *ib_conn; 417 int ret; 418 419 device = iser_device_find_by_ib_device(cma_id); 420 if (!device) { 421 iser_err("device lookup/creation failed\n"); 422 return iser_connect_error(cma_id); 423 } 424 425 ib_conn = (struct iser_conn *)cma_id->context; 426 ib_conn->device = device; 427 428 ret = rdma_resolve_route(cma_id, 1000); 429 if (ret) { 430 iser_err("resolve route failed: %d\n", ret); 431 return iser_connect_error(cma_id); 432 } 433 434 return 0; 435} 436 437static int iser_route_handler(struct rdma_cm_id *cma_id) 438{ 439 struct rdma_conn_param conn_param; 440 int ret; 441 442 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 443 if (ret) 444 goto failure; 445 446 memset(&conn_param, 0, sizeof conn_param); 447 conn_param.responder_resources = 4; 448 conn_param.initiator_depth = 1; 449 conn_param.retry_count = 7; 450 conn_param.rnr_retry_count = 6; 451 452 ret = rdma_connect(cma_id, &conn_param); 453 if (ret) { 454 iser_err("failure connecting: %d\n", ret); 455 goto failure; 456 } 457 458 return 0; 459failure: 460 return iser_connect_error(cma_id); 461} 462 463static void iser_connected_handler(struct rdma_cm_id *cma_id) 464{ 465 struct iser_conn *ib_conn; 466 467 ib_conn = (struct iser_conn *)cma_id->context; 468 ib_conn->state = ISER_CONN_UP; 469 wake_up_interruptible(&ib_conn->wait); 470} 471 472static int iser_disconnected_handler(struct rdma_cm_id *cma_id) 473{ 474 struct iser_conn *ib_conn; 475 int ret; 476 477 ib_conn = (struct iser_conn *)cma_id->context; 478 479 /* getting here when the state is UP means that the conn is being * 480 * terminated asynchronously from the iSCSI layer's perspective. */ 481 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 482 ISER_CONN_TERMINATING)) 483 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 484 ISCSI_ERR_CONN_FAILED); 485 486 /* Complete the termination process if no posts are pending */ 487 if (ib_conn->post_recv_buf_count == 0 && 488 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 489 ib_conn->state = ISER_CONN_DOWN; 490 wake_up_interruptible(&ib_conn->wait); 491 } 492 493 ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 494 return ret; 495} 496 497static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 498{ 499 int ret = 0; 500 501 iser_err("event %d status %d conn %p id %p\n", 502 event->event, event->status, cma_id->context, cma_id); 503 504 switch (event->event) { 505 case RDMA_CM_EVENT_ADDR_RESOLVED: 506 ret = iser_addr_handler(cma_id); 507 break; 508 case RDMA_CM_EVENT_ROUTE_RESOLVED: 509 ret = iser_route_handler(cma_id); 510 break; 511 case RDMA_CM_EVENT_ESTABLISHED: 512 iser_connected_handler(cma_id); 513 break; 514 case RDMA_CM_EVENT_ADDR_ERROR: 515 case RDMA_CM_EVENT_ROUTE_ERROR: 516 case RDMA_CM_EVENT_CONNECT_ERROR: 517 case RDMA_CM_EVENT_UNREACHABLE: 518 case RDMA_CM_EVENT_REJECTED: 519 ret = iser_connect_error(cma_id); 520 break; 521 case RDMA_CM_EVENT_DISCONNECTED: 522 case RDMA_CM_EVENT_DEVICE_REMOVAL: 523 case RDMA_CM_EVENT_ADDR_CHANGE: 524 ret = iser_disconnected_handler(cma_id); 525 break; 526 default: 527 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 528 break; 529 } 530 return ret; 531} 532 533void iser_conn_init(struct iser_conn *ib_conn) 534{ 535 ib_conn->state = ISER_CONN_INIT; 536 init_waitqueue_head(&ib_conn->wait); 537 ib_conn->post_recv_buf_count = 0; 538 atomic_set(&ib_conn->post_send_buf_count, 0); 539 atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */ 540 INIT_LIST_HEAD(&ib_conn->conn_list); 541 spin_lock_init(&ib_conn->lock); 542} 543 544 /** 545 * starts the process of connecting to the target 546 * sleeps until the connection is established or rejected 547 */ 548int iser_connect(struct iser_conn *ib_conn, 549 struct sockaddr_in *src_addr, 550 struct sockaddr_in *dst_addr, 551 int non_blocking) 552{ 553 struct sockaddr *src, *dst; 554 int err = 0; 555 556 sprintf(ib_conn->name, "%pI4:%d", 557 &dst_addr->sin_addr.s_addr, dst_addr->sin_port); 558 559 /* the device is known only --after-- address resolution */ 560 ib_conn->device = NULL; 561 562 iser_err("connecting to: %pI4, port 0x%x\n", 563 &dst_addr->sin_addr, dst_addr->sin_port); 564 565 ib_conn->state = ISER_CONN_PENDING; 566 567 iser_conn_get(ib_conn); /* ref ib conn's cma id */ 568 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 569 (void *)ib_conn, 570 RDMA_PS_TCP, IB_QPT_RC); 571 if (IS_ERR(ib_conn->cma_id)) { 572 err = PTR_ERR(ib_conn->cma_id); 573 iser_err("rdma_create_id failed: %d\n", err); 574 goto id_failure; 575 } 576 577 src = (struct sockaddr *)src_addr; 578 dst = (struct sockaddr *)dst_addr; 579 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 580 if (err) { 581 iser_err("rdma_resolve_addr failed: %d\n", err); 582 goto addr_failure; 583 } 584 585 if (!non_blocking) { 586 wait_event_interruptible(ib_conn->wait, 587 (ib_conn->state != ISER_CONN_PENDING)); 588 589 if (ib_conn->state != ISER_CONN_UP) { 590 err = -EIO; 591 goto connect_failure; 592 } 593 } 594 595 mutex_lock(&ig.connlist_mutex); 596 list_add(&ib_conn->conn_list, &ig.connlist); 597 mutex_unlock(&ig.connlist_mutex); 598 return 0; 599 600id_failure: 601 ib_conn->cma_id = NULL; 602addr_failure: 603 ib_conn->state = ISER_CONN_DOWN; 604connect_failure: 605 iser_conn_release(ib_conn, 1); 606 return err; 607} 608 609/** 610 * iser_reg_page_vec - Register physical memory 611 * 612 * returns: 0 on success, errno code on failure 613 */ 614int iser_reg_page_vec(struct iser_conn *ib_conn, 615 struct iser_page_vec *page_vec, 616 struct iser_mem_reg *mem_reg) 617{ 618 struct ib_pool_fmr *mem; 619 u64 io_addr; 620 u64 *page_list; 621 int status; 622 623 page_list = page_vec->pages; 624 io_addr = page_list[0]; 625 626 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 627 page_list, 628 page_vec->length, 629 io_addr); 630 631 if (IS_ERR(mem)) { 632 status = (int)PTR_ERR(mem); 633 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 634 return status; 635 } 636 637 mem_reg->lkey = mem->fmr->lkey; 638 mem_reg->rkey = mem->fmr->rkey; 639 mem_reg->len = page_vec->length * SIZE_4K; 640 mem_reg->va = io_addr; 641 mem_reg->is_fmr = 1; 642 mem_reg->mem_h = (void *)mem; 643 644 mem_reg->va += page_vec->offset; 645 mem_reg->len = page_vec->data_size; 646 647 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 648 "entry[0]: (0x%08lx,%ld)] -> " 649 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 650 page_vec, page_vec->length, 651 (unsigned long)page_vec->pages[0], 652 (unsigned long)page_vec->data_size, 653 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 654 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 655 return 0; 656} 657 658/** 659 * Unregister (previosuly registered) memory. 660 */ 661void iser_unreg_mem(struct iser_mem_reg *reg) 662{ 663 int ret; 664 665 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 666 667 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 668 if (ret) 669 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 670 671 reg->mem_h = NULL; 672} 673 674int iser_post_recvl(struct iser_conn *ib_conn) 675{ 676 struct ib_recv_wr rx_wr, *rx_wr_failed; 677 struct ib_sge sge; 678 int ib_ret; 679 680 sge.addr = ib_conn->login_resp_dma; 681 sge.length = ISER_RX_LOGIN_SIZE; 682 sge.lkey = ib_conn->device->mr->lkey; 683 684 rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf; 685 rx_wr.sg_list = &sge; 686 rx_wr.num_sge = 1; 687 rx_wr.next = NULL; 688 689 ib_conn->post_recv_buf_count++; 690 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); 691 if (ib_ret) { 692 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 693 ib_conn->post_recv_buf_count--; 694 } 695 return ib_ret; 696} 697 698int iser_post_recvm(struct iser_conn *ib_conn, int count) 699{ 700 struct ib_recv_wr *rx_wr, *rx_wr_failed; 701 int i, ib_ret; 702 unsigned int my_rx_head = ib_conn->rx_desc_head; 703 struct iser_rx_desc *rx_desc; 704 705 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 706 rx_desc = &ib_conn->rx_descs[my_rx_head]; 707 rx_wr->wr_id = (unsigned long)rx_desc; 708 rx_wr->sg_list = &rx_desc->rx_sg; 709 rx_wr->num_sge = 1; 710 rx_wr->next = rx_wr + 1; 711 my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); 712 } 713 714 rx_wr--; 715 rx_wr->next = NULL; /* mark end of work requests list */ 716 717 ib_conn->post_recv_buf_count += count; 718 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); 719 if (ib_ret) { 720 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 721 ib_conn->post_recv_buf_count -= count; 722 } else 723 ib_conn->rx_desc_head = my_rx_head; 724 return ib_ret; 725} 726 727 728/** 729 * iser_start_send - Initiate a Send DTO operation 730 * 731 * returns 0 on success, -1 on failure 732 */ 733int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) 734{ 735 int ib_ret; 736 struct ib_send_wr send_wr, *send_wr_failed; 737 738 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 739 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 740 741 send_wr.next = NULL; 742 send_wr.wr_id = (unsigned long)tx_desc; 743 send_wr.sg_list = tx_desc->tx_sg; 744 send_wr.num_sge = tx_desc->num_sge; 745 send_wr.opcode = IB_WR_SEND; 746 send_wr.send_flags = IB_SEND_SIGNALED; 747 748 atomic_inc(&ib_conn->post_send_buf_count); 749 750 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 751 if (ib_ret) { 752 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 753 atomic_dec(&ib_conn->post_send_buf_count); 754 } 755 return ib_ret; 756} 757 758static void iser_handle_comp_error(struct iser_tx_desc *desc, 759 struct iser_conn *ib_conn) 760{ 761 if (desc && desc->type == ISCSI_TX_DATAOUT) 762 kmem_cache_free(ig.desc_cache, desc); 763 764 if (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 /* no more non completed posts to the QP, complete the 775 * termination process w.o worrying on disconnect event */ 776 ib_conn->state = ISER_CONN_DOWN; 777 wake_up_interruptible(&ib_conn->wait); 778 } 779} 780 781static int iser_drain_tx_cq(struct iser_device *device) 782{ 783 struct ib_cq *cq = device->tx_cq; 784 struct ib_wc wc; 785 struct iser_tx_desc *tx_desc; 786 struct iser_conn *ib_conn; 787 int completed_tx = 0; 788 789 while (ib_poll_cq(cq, 1, &wc) == 1) { 790 tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; 791 ib_conn = wc.qp->qp_context; 792 if (wc.status == IB_WC_SUCCESS) { 793 if (wc.opcode == IB_WC_SEND) 794 iser_snd_completion(tx_desc, ib_conn); 795 else 796 iser_err("expected opcode %d got %d\n", 797 IB_WC_SEND, wc.opcode); 798 } else { 799 iser_err("tx id %llx status %d vend_err %x\n", 800 wc.wr_id, wc.status, wc.vendor_err); 801 atomic_dec(&ib_conn->post_send_buf_count); 802 iser_handle_comp_error(tx_desc, ib_conn); 803 } 804 completed_tx++; 805 } 806 return completed_tx; 807} 808 809 810static void iser_cq_tasklet_fn(unsigned long data) 811{ 812 struct iser_device *device = (struct iser_device *)data; 813 struct ib_cq *cq = device->rx_cq; 814 struct ib_wc wc; 815 struct iser_rx_desc *desc; 816 unsigned long xfer_len; 817 struct iser_conn *ib_conn; 818 int completed_tx, completed_rx; 819 completed_tx = completed_rx = 0; 820 821 while (ib_poll_cq(cq, 1, &wc) == 1) { 822 desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; 823 BUG_ON(desc == NULL); 824 ib_conn = wc.qp->qp_context; 825 if (wc.status == IB_WC_SUCCESS) { 826 if (wc.opcode == IB_WC_RECV) { 827 xfer_len = (unsigned long)wc.byte_len; 828 iser_rcv_completion(desc, xfer_len, ib_conn); 829 } else 830 iser_err("expected opcode %d got %d\n", 831 IB_WC_RECV, wc.opcode); 832 } else { 833 if (wc.status != IB_WC_WR_FLUSH_ERR) 834 iser_err("rx id %llx status %d vend_err %x\n", 835 wc.wr_id, wc.status, wc.vendor_err); 836 ib_conn->post_recv_buf_count--; 837 iser_handle_comp_error(NULL, ib_conn); 838 } 839 completed_rx++; 840 if (!(completed_rx & 63)) 841 completed_tx += iser_drain_tx_cq(device); 842 } 843 /* #warning "it is assumed here that arming CQ only once its empty" * 844 * " would not cause interrupts to be missed" */ 845 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 846 847 completed_tx += iser_drain_tx_cq(device); 848 iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); 849} 850 851static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 852{ 853 struct iser_device *device = (struct iser_device *)cq_context; 854 855 tasklet_schedule(&device->cq_tasklet); 856} 857