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 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 static 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 */ 71 static int iser_create_device_ib_res(struct iser_device *device) 72 { 73 int i, j; 74 struct iser_cq_desc *cq_desc; 75 76 device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors); 77 iser_err("using %d CQs, device %s supports %d vectors\n", device->cqs_used, 78 device->ib_device->name, device->ib_device->num_comp_vectors); 79 80 device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used, 81 GFP_KERNEL); 82 if (device->cq_desc == NULL) 83 goto cq_desc_err; 84 cq_desc = device->cq_desc; 85 86 device->pd = ib_alloc_pd(device->ib_device); 87 if (IS_ERR(device->pd)) 88 goto pd_err; 89 90 for (i = 0; i < device->cqs_used; i++) { 91 cq_desc[i].device = device; 92 cq_desc[i].cq_index = i; 93 94 device->rx_cq[i] = ib_create_cq(device->ib_device, 95 iser_cq_callback, 96 iser_cq_event_callback, 97 (void *)&cq_desc[i], 98 ISER_MAX_RX_CQ_LEN, i); 99 if (IS_ERR(device->rx_cq[i])) 100 goto cq_err; 101 102 device->tx_cq[i] = ib_create_cq(device->ib_device, 103 NULL, iser_cq_event_callback, 104 (void *)&cq_desc[i], 105 ISER_MAX_TX_CQ_LEN, i); 106 107 if (IS_ERR(device->tx_cq[i])) 108 goto cq_err; 109 110 if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP)) 111 goto cq_err; 112 113 tasklet_init(&device->cq_tasklet[i], 114 iser_cq_tasklet_fn, 115 (unsigned long)&cq_desc[i]); 116 } 117 118 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 119 IB_ACCESS_REMOTE_WRITE | 120 IB_ACCESS_REMOTE_READ); 121 if (IS_ERR(device->mr)) 122 goto dma_mr_err; 123 124 INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, 125 iser_event_handler); 126 if (ib_register_event_handler(&device->event_handler)) 127 goto handler_err; 128 129 return 0; 130 131 handler_err: 132 ib_dereg_mr(device->mr); 133 dma_mr_err: 134 for (j = 0; j < device->cqs_used; j++) 135 tasklet_kill(&device->cq_tasklet[j]); 136 cq_err: 137 for (j = 0; j < i; j++) { 138 if (device->tx_cq[j]) 139 ib_destroy_cq(device->tx_cq[j]); 140 if (device->rx_cq[j]) 141 ib_destroy_cq(device->rx_cq[j]); 142 } 143 ib_dealloc_pd(device->pd); 144 pd_err: 145 kfree(device->cq_desc); 146 cq_desc_err: 147 iser_err("failed to allocate an IB resource\n"); 148 return -1; 149 } 150 151 /** 152 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 153 * CQ and PD created with the device associated with the adapator. 154 */ 155 static void iser_free_device_ib_res(struct iser_device *device) 156 { 157 int i; 158 BUG_ON(device->mr == NULL); 159 160 for (i = 0; i < device->cqs_used; i++) { 161 tasklet_kill(&device->cq_tasklet[i]); 162 (void)ib_destroy_cq(device->tx_cq[i]); 163 (void)ib_destroy_cq(device->rx_cq[i]); 164 device->tx_cq[i] = NULL; 165 device->rx_cq[i] = NULL; 166 } 167 168 (void)ib_unregister_event_handler(&device->event_handler); 169 (void)ib_dereg_mr(device->mr); 170 (void)ib_dealloc_pd(device->pd); 171 172 kfree(device->cq_desc); 173 174 device->mr = NULL; 175 device->pd = NULL; 176 } 177 178 /** 179 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 180 * 181 * returns 0 on success, -1 on failure 182 */ 183 static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 184 { 185 struct iser_device *device; 186 struct ib_qp_init_attr init_attr; 187 int req_err, resp_err, ret = -ENOMEM; 188 struct ib_fmr_pool_param params; 189 int index, min_index = 0; 190 191 BUG_ON(ib_conn->device == NULL); 192 193 device = ib_conn->device; 194 195 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 196 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 197 if (!ib_conn->login_buf) 198 goto out_err; 199 200 ib_conn->login_req_buf = ib_conn->login_buf; 201 ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN; 202 203 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 204 (void *)ib_conn->login_req_buf, 205 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 206 207 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 208 (void *)ib_conn->login_resp_buf, 209 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 210 211 req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma); 212 resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma); 213 214 if (req_err || resp_err) { 215 if (req_err) 216 ib_conn->login_req_dma = 0; 217 if (resp_err) 218 ib_conn->login_resp_dma = 0; 219 goto out_err; 220 } 221 222 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 223 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 224 GFP_KERNEL); 225 if (!ib_conn->page_vec) 226 goto out_err; 227 228 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 229 230 params.page_shift = SHIFT_4K; 231 /* when the first/last SG element are not start/end * 232 * page aligned, the map whould be of N+1 pages */ 233 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 234 /* make the pool size twice the max number of SCSI commands * 235 * the ML is expected to queue, watermark for unmap at 50% */ 236 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 237 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 238 params.cache = 0; 239 params.flush_function = NULL; 240 params.access = (IB_ACCESS_LOCAL_WRITE | 241 IB_ACCESS_REMOTE_WRITE | 242 IB_ACCESS_REMOTE_READ); 243 244 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 245 if (IS_ERR(ib_conn->fmr_pool)) { 246 ret = PTR_ERR(ib_conn->fmr_pool); 247 ib_conn->fmr_pool = NULL; 248 goto out_err; 249 } 250 251 memset(&init_attr, 0, sizeof init_attr); 252 253 mutex_lock(&ig.connlist_mutex); 254 /* select the CQ with the minimal number of usages */ 255 for (index = 0; index < device->cqs_used; index++) 256 if (device->cq_active_qps[index] < 257 device->cq_active_qps[min_index]) 258 min_index = index; 259 device->cq_active_qps[min_index]++; 260 mutex_unlock(&ig.connlist_mutex); 261 iser_err("cq index %d used for ib_conn %p\n", min_index, ib_conn); 262 263 init_attr.event_handler = iser_qp_event_callback; 264 init_attr.qp_context = (void *)ib_conn; 265 init_attr.send_cq = device->tx_cq[min_index]; 266 init_attr.recv_cq = device->rx_cq[min_index]; 267 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 268 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 269 init_attr.cap.max_send_sge = 2; 270 init_attr.cap.max_recv_sge = 1; 271 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 272 init_attr.qp_type = IB_QPT_RC; 273 274 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 275 if (ret) 276 goto out_err; 277 278 ib_conn->qp = ib_conn->cma_id->qp; 279 iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 280 ib_conn, ib_conn->cma_id, 281 ib_conn->fmr_pool, ib_conn->cma_id->qp); 282 return ret; 283 284 out_err: 285 iser_err("unable to alloc mem or create resource, err %d\n", ret); 286 return ret; 287 } 288 289 /** 290 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 291 * -1 on failure 292 */ 293 static int iser_free_ib_conn_res(struct iser_conn *ib_conn, int can_destroy_id) 294 { 295 int cq_index; 296 BUG_ON(ib_conn == NULL); 297 298 iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n", 299 ib_conn, ib_conn->cma_id, 300 ib_conn->fmr_pool, ib_conn->qp); 301 302 /* qp is created only once both addr & route are resolved */ 303 if (ib_conn->fmr_pool != NULL) 304 ib_destroy_fmr_pool(ib_conn->fmr_pool); 305 306 if (ib_conn->qp != NULL) { 307 cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index; 308 ib_conn->device->cq_active_qps[cq_index]--; 309 310 rdma_destroy_qp(ib_conn->cma_id); 311 } 312 /* if cma handler context, the caller acts s.t the cma destroy the id */ 313 if (ib_conn->cma_id != NULL && can_destroy_id) 314 rdma_destroy_id(ib_conn->cma_id); 315 316 ib_conn->fmr_pool = NULL; 317 ib_conn->qp = NULL; 318 ib_conn->cma_id = NULL; 319 kfree(ib_conn->page_vec); 320 321 if (ib_conn->login_buf) { 322 if (ib_conn->login_req_dma) 323 ib_dma_unmap_single(ib_conn->device->ib_device, 324 ib_conn->login_req_dma, 325 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 326 if (ib_conn->login_resp_dma) 327 ib_dma_unmap_single(ib_conn->device->ib_device, 328 ib_conn->login_resp_dma, 329 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 330 kfree(ib_conn->login_buf); 331 } 332 333 return 0; 334 } 335 336 /** 337 * based on the resolved device node GUID see if there already allocated 338 * device for this device. If there's no such, create one. 339 */ 340 static 341 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 342 { 343 struct iser_device *device; 344 345 mutex_lock(&ig.device_list_mutex); 346 347 list_for_each_entry(device, &ig.device_list, ig_list) 348 /* find if there's a match using the node GUID */ 349 if (device->ib_device->node_guid == cma_id->device->node_guid) 350 goto inc_refcnt; 351 352 device = kzalloc(sizeof *device, GFP_KERNEL); 353 if (device == NULL) 354 goto out; 355 356 /* assign this device to the device */ 357 device->ib_device = cma_id->device; 358 /* init the device and link it into ig device list */ 359 if (iser_create_device_ib_res(device)) { 360 kfree(device); 361 device = NULL; 362 goto out; 363 } 364 list_add(&device->ig_list, &ig.device_list); 365 366 inc_refcnt: 367 device->refcount++; 368 out: 369 mutex_unlock(&ig.device_list_mutex); 370 return device; 371 } 372 373 /* if there's no demand for this device, release it */ 374 static void iser_device_try_release(struct iser_device *device) 375 { 376 mutex_lock(&ig.device_list_mutex); 377 device->refcount--; 378 iser_err("device %p refcount %d\n",device,device->refcount); 379 if (!device->refcount) { 380 iser_free_device_ib_res(device); 381 list_del(&device->ig_list); 382 kfree(device); 383 } 384 mutex_unlock(&ig.device_list_mutex); 385 } 386 387 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 388 enum iser_ib_conn_state comp, 389 enum iser_ib_conn_state exch) 390 { 391 int ret; 392 393 spin_lock_bh(&ib_conn->lock); 394 if ((ret = (ib_conn->state == comp))) 395 ib_conn->state = exch; 396 spin_unlock_bh(&ib_conn->lock); 397 return ret; 398 } 399 400 /** 401 * Frees all conn objects and deallocs conn descriptor 402 */ 403 static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id) 404 { 405 struct iser_device *device = ib_conn->device; 406 407 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 408 409 mutex_lock(&ig.connlist_mutex); 410 list_del(&ib_conn->conn_list); 411 mutex_unlock(&ig.connlist_mutex); 412 iser_free_rx_descriptors(ib_conn); 413 iser_free_ib_conn_res(ib_conn, can_destroy_id); 414 ib_conn->device = NULL; 415 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 416 if (device != NULL) 417 iser_device_try_release(device); 418 iscsi_destroy_endpoint(ib_conn->ep); 419 } 420 421 void iser_conn_get(struct iser_conn *ib_conn) 422 { 423 atomic_inc(&ib_conn->refcount); 424 } 425 426 int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id) 427 { 428 if (atomic_dec_and_test(&ib_conn->refcount)) { 429 iser_conn_release(ib_conn, can_destroy_id); 430 return 1; 431 } 432 return 0; 433 } 434 435 /** 436 * triggers start of the disconnect procedures and wait for them to be done 437 */ 438 void iser_conn_terminate(struct iser_conn *ib_conn) 439 { 440 int err = 0; 441 442 /* change the ib conn state only if the conn is UP, however always call 443 * rdma_disconnect since this is the only way to cause the CMA to change 444 * the QP state to ERROR 445 */ 446 447 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 448 err = rdma_disconnect(ib_conn->cma_id); 449 if (err) 450 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 451 ib_conn,err); 452 453 wait_event_interruptible(ib_conn->wait, 454 ib_conn->state == ISER_CONN_DOWN); 455 456 iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ 457 } 458 459 static int iser_connect_error(struct rdma_cm_id *cma_id) 460 { 461 struct iser_conn *ib_conn; 462 ib_conn = (struct iser_conn *)cma_id->context; 463 464 ib_conn->state = ISER_CONN_DOWN; 465 wake_up_interruptible(&ib_conn->wait); 466 return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 467 } 468 469 static int iser_addr_handler(struct rdma_cm_id *cma_id) 470 { 471 struct iser_device *device; 472 struct iser_conn *ib_conn; 473 int ret; 474 475 device = iser_device_find_by_ib_device(cma_id); 476 if (!device) { 477 iser_err("device lookup/creation failed\n"); 478 return iser_connect_error(cma_id); 479 } 480 481 ib_conn = (struct iser_conn *)cma_id->context; 482 ib_conn->device = device; 483 484 ret = rdma_resolve_route(cma_id, 1000); 485 if (ret) { 486 iser_err("resolve route failed: %d\n", ret); 487 return iser_connect_error(cma_id); 488 } 489 490 return 0; 491 } 492 493 static int iser_route_handler(struct rdma_cm_id *cma_id) 494 { 495 struct rdma_conn_param conn_param; 496 int ret; 497 498 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 499 if (ret) 500 goto failure; 501 502 memset(&conn_param, 0, sizeof conn_param); 503 conn_param.responder_resources = 4; 504 conn_param.initiator_depth = 1; 505 conn_param.retry_count = 7; 506 conn_param.rnr_retry_count = 6; 507 508 ret = rdma_connect(cma_id, &conn_param); 509 if (ret) { 510 iser_err("failure connecting: %d\n", ret); 511 goto failure; 512 } 513 514 return 0; 515 failure: 516 return iser_connect_error(cma_id); 517 } 518 519 static void iser_connected_handler(struct rdma_cm_id *cma_id) 520 { 521 struct iser_conn *ib_conn; 522 523 ib_conn = (struct iser_conn *)cma_id->context; 524 ib_conn->state = ISER_CONN_UP; 525 wake_up_interruptible(&ib_conn->wait); 526 } 527 528 static int iser_disconnected_handler(struct rdma_cm_id *cma_id) 529 { 530 struct iser_conn *ib_conn; 531 int ret; 532 533 ib_conn = (struct iser_conn *)cma_id->context; 534 535 /* getting here when the state is UP means that the conn is being * 536 * terminated asynchronously from the iSCSI layer's perspective. */ 537 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 538 ISER_CONN_TERMINATING)) 539 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 540 ISCSI_ERR_CONN_FAILED); 541 542 /* Complete the termination process if no posts are pending */ 543 if (ib_conn->post_recv_buf_count == 0 && 544 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 545 ib_conn->state = ISER_CONN_DOWN; 546 wake_up_interruptible(&ib_conn->wait); 547 } 548 549 ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 550 return ret; 551 } 552 553 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 554 { 555 int ret = 0; 556 557 iser_err("event %d status %d conn %p id %p\n", 558 event->event, event->status, cma_id->context, cma_id); 559 560 switch (event->event) { 561 case RDMA_CM_EVENT_ADDR_RESOLVED: 562 ret = iser_addr_handler(cma_id); 563 break; 564 case RDMA_CM_EVENT_ROUTE_RESOLVED: 565 ret = iser_route_handler(cma_id); 566 break; 567 case RDMA_CM_EVENT_ESTABLISHED: 568 iser_connected_handler(cma_id); 569 break; 570 case RDMA_CM_EVENT_ADDR_ERROR: 571 case RDMA_CM_EVENT_ROUTE_ERROR: 572 case RDMA_CM_EVENT_CONNECT_ERROR: 573 case RDMA_CM_EVENT_UNREACHABLE: 574 case RDMA_CM_EVENT_REJECTED: 575 ret = iser_connect_error(cma_id); 576 break; 577 case RDMA_CM_EVENT_DISCONNECTED: 578 case RDMA_CM_EVENT_DEVICE_REMOVAL: 579 case RDMA_CM_EVENT_ADDR_CHANGE: 580 ret = iser_disconnected_handler(cma_id); 581 break; 582 default: 583 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 584 break; 585 } 586 return ret; 587 } 588 589 void iser_conn_init(struct iser_conn *ib_conn) 590 { 591 ib_conn->state = ISER_CONN_INIT; 592 init_waitqueue_head(&ib_conn->wait); 593 ib_conn->post_recv_buf_count = 0; 594 atomic_set(&ib_conn->post_send_buf_count, 0); 595 atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */ 596 INIT_LIST_HEAD(&ib_conn->conn_list); 597 spin_lock_init(&ib_conn->lock); 598 } 599 600 /** 601 * starts the process of connecting to the target 602 * sleeps until the connection is established or rejected 603 */ 604 int iser_connect(struct iser_conn *ib_conn, 605 struct sockaddr_in *src_addr, 606 struct sockaddr_in *dst_addr, 607 int non_blocking) 608 { 609 struct sockaddr *src, *dst; 610 int err = 0; 611 612 sprintf(ib_conn->name, "%pI4:%d", 613 &dst_addr->sin_addr.s_addr, dst_addr->sin_port); 614 615 /* the device is known only --after-- address resolution */ 616 ib_conn->device = NULL; 617 618 iser_err("connecting to: %pI4, port 0x%x\n", 619 &dst_addr->sin_addr, dst_addr->sin_port); 620 621 ib_conn->state = ISER_CONN_PENDING; 622 623 iser_conn_get(ib_conn); /* ref ib conn's cma id */ 624 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 625 (void *)ib_conn, 626 RDMA_PS_TCP, IB_QPT_RC); 627 if (IS_ERR(ib_conn->cma_id)) { 628 err = PTR_ERR(ib_conn->cma_id); 629 iser_err("rdma_create_id failed: %d\n", err); 630 goto id_failure; 631 } 632 633 src = (struct sockaddr *)src_addr; 634 dst = (struct sockaddr *)dst_addr; 635 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 636 if (err) { 637 iser_err("rdma_resolve_addr failed: %d\n", err); 638 goto addr_failure; 639 } 640 641 if (!non_blocking) { 642 wait_event_interruptible(ib_conn->wait, 643 (ib_conn->state != ISER_CONN_PENDING)); 644 645 if (ib_conn->state != ISER_CONN_UP) { 646 err = -EIO; 647 goto connect_failure; 648 } 649 } 650 651 mutex_lock(&ig.connlist_mutex); 652 list_add(&ib_conn->conn_list, &ig.connlist); 653 mutex_unlock(&ig.connlist_mutex); 654 return 0; 655 656 id_failure: 657 ib_conn->cma_id = NULL; 658 addr_failure: 659 ib_conn->state = ISER_CONN_DOWN; 660 iser_conn_put(ib_conn, 1); /* deref ib conn's cma id */ 661 connect_failure: 662 iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ 663 return err; 664 } 665 666 /** 667 * iser_reg_page_vec - Register physical memory 668 * 669 * returns: 0 on success, errno code on failure 670 */ 671 int iser_reg_page_vec(struct iser_conn *ib_conn, 672 struct iser_page_vec *page_vec, 673 struct iser_mem_reg *mem_reg) 674 { 675 struct ib_pool_fmr *mem; 676 u64 io_addr; 677 u64 *page_list; 678 int status; 679 680 page_list = page_vec->pages; 681 io_addr = page_list[0]; 682 683 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 684 page_list, 685 page_vec->length, 686 io_addr); 687 688 if (IS_ERR(mem)) { 689 status = (int)PTR_ERR(mem); 690 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 691 return status; 692 } 693 694 mem_reg->lkey = mem->fmr->lkey; 695 mem_reg->rkey = mem->fmr->rkey; 696 mem_reg->len = page_vec->length * SIZE_4K; 697 mem_reg->va = io_addr; 698 mem_reg->is_fmr = 1; 699 mem_reg->mem_h = (void *)mem; 700 701 mem_reg->va += page_vec->offset; 702 mem_reg->len = page_vec->data_size; 703 704 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 705 "entry[0]: (0x%08lx,%ld)] -> " 706 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 707 page_vec, page_vec->length, 708 (unsigned long)page_vec->pages[0], 709 (unsigned long)page_vec->data_size, 710 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 711 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 712 return 0; 713 } 714 715 /** 716 * Unregister (previosuly registered) memory. 717 */ 718 void iser_unreg_mem(struct iser_mem_reg *reg) 719 { 720 int ret; 721 722 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 723 724 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 725 if (ret) 726 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 727 728 reg->mem_h = NULL; 729 } 730 731 int iser_post_recvl(struct iser_conn *ib_conn) 732 { 733 struct ib_recv_wr rx_wr, *rx_wr_failed; 734 struct ib_sge sge; 735 int ib_ret; 736 737 sge.addr = ib_conn->login_resp_dma; 738 sge.length = ISER_RX_LOGIN_SIZE; 739 sge.lkey = ib_conn->device->mr->lkey; 740 741 rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf; 742 rx_wr.sg_list = &sge; 743 rx_wr.num_sge = 1; 744 rx_wr.next = NULL; 745 746 ib_conn->post_recv_buf_count++; 747 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); 748 if (ib_ret) { 749 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 750 ib_conn->post_recv_buf_count--; 751 } 752 return ib_ret; 753 } 754 755 int iser_post_recvm(struct iser_conn *ib_conn, int count) 756 { 757 struct ib_recv_wr *rx_wr, *rx_wr_failed; 758 int i, ib_ret; 759 unsigned int my_rx_head = ib_conn->rx_desc_head; 760 struct iser_rx_desc *rx_desc; 761 762 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 763 rx_desc = &ib_conn->rx_descs[my_rx_head]; 764 rx_wr->wr_id = (unsigned long)rx_desc; 765 rx_wr->sg_list = &rx_desc->rx_sg; 766 rx_wr->num_sge = 1; 767 rx_wr->next = rx_wr + 1; 768 my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); 769 } 770 771 rx_wr--; 772 rx_wr->next = NULL; /* mark end of work requests list */ 773 774 ib_conn->post_recv_buf_count += count; 775 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); 776 if (ib_ret) { 777 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 778 ib_conn->post_recv_buf_count -= count; 779 } else 780 ib_conn->rx_desc_head = my_rx_head; 781 return ib_ret; 782 } 783 784 785 /** 786 * iser_start_send - Initiate a Send DTO operation 787 * 788 * returns 0 on success, -1 on failure 789 */ 790 int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) 791 { 792 int ib_ret; 793 struct ib_send_wr send_wr, *send_wr_failed; 794 795 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 796 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 797 798 send_wr.next = NULL; 799 send_wr.wr_id = (unsigned long)tx_desc; 800 send_wr.sg_list = tx_desc->tx_sg; 801 send_wr.num_sge = tx_desc->num_sge; 802 send_wr.opcode = IB_WR_SEND; 803 send_wr.send_flags = IB_SEND_SIGNALED; 804 805 atomic_inc(&ib_conn->post_send_buf_count); 806 807 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 808 if (ib_ret) { 809 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 810 atomic_dec(&ib_conn->post_send_buf_count); 811 } 812 return ib_ret; 813 } 814 815 static void iser_handle_comp_error(struct iser_tx_desc *desc, 816 struct iser_conn *ib_conn) 817 { 818 if (desc && desc->type == ISCSI_TX_DATAOUT) 819 kmem_cache_free(ig.desc_cache, desc); 820 821 if (ib_conn->post_recv_buf_count == 0 && 822 atomic_read(&ib_conn->post_send_buf_count) == 0) { 823 /* getting here when the state is UP means that the conn is * 824 * being terminated asynchronously from the iSCSI layer's * 825 * perspective. */ 826 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 827 ISER_CONN_TERMINATING)) 828 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 829 ISCSI_ERR_CONN_FAILED); 830 831 /* no more non completed posts to the QP, complete the 832 * termination process w.o worrying on disconnect event */ 833 ib_conn->state = ISER_CONN_DOWN; 834 wake_up_interruptible(&ib_conn->wait); 835 } 836 } 837 838 static int iser_drain_tx_cq(struct iser_device *device, int cq_index) 839 { 840 struct ib_cq *cq = device->tx_cq[cq_index]; 841 struct ib_wc wc; 842 struct iser_tx_desc *tx_desc; 843 struct iser_conn *ib_conn; 844 int completed_tx = 0; 845 846 while (ib_poll_cq(cq, 1, &wc) == 1) { 847 tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; 848 ib_conn = wc.qp->qp_context; 849 if (wc.status == IB_WC_SUCCESS) { 850 if (wc.opcode == IB_WC_SEND) 851 iser_snd_completion(tx_desc, ib_conn); 852 else 853 iser_err("expected opcode %d got %d\n", 854 IB_WC_SEND, wc.opcode); 855 } else { 856 iser_err("tx id %llx status %d vend_err %x\n", 857 wc.wr_id, wc.status, wc.vendor_err); 858 atomic_dec(&ib_conn->post_send_buf_count); 859 iser_handle_comp_error(tx_desc, ib_conn); 860 } 861 completed_tx++; 862 } 863 return completed_tx; 864 } 865 866 867 static void iser_cq_tasklet_fn(unsigned long data) 868 { 869 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data; 870 struct iser_device *device = cq_desc->device; 871 int cq_index = cq_desc->cq_index; 872 struct ib_cq *cq = device->rx_cq[cq_index]; 873 struct ib_wc wc; 874 struct iser_rx_desc *desc; 875 unsigned long xfer_len; 876 struct iser_conn *ib_conn; 877 int completed_tx, completed_rx; 878 completed_tx = completed_rx = 0; 879 880 while (ib_poll_cq(cq, 1, &wc) == 1) { 881 desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; 882 BUG_ON(desc == NULL); 883 ib_conn = wc.qp->qp_context; 884 if (wc.status == IB_WC_SUCCESS) { 885 if (wc.opcode == IB_WC_RECV) { 886 xfer_len = (unsigned long)wc.byte_len; 887 iser_rcv_completion(desc, xfer_len, ib_conn); 888 } else 889 iser_err("expected opcode %d got %d\n", 890 IB_WC_RECV, wc.opcode); 891 } else { 892 if (wc.status != IB_WC_WR_FLUSH_ERR) 893 iser_err("rx id %llx status %d vend_err %x\n", 894 wc.wr_id, wc.status, wc.vendor_err); 895 ib_conn->post_recv_buf_count--; 896 iser_handle_comp_error(NULL, ib_conn); 897 } 898 completed_rx++; 899 if (!(completed_rx & 63)) 900 completed_tx += iser_drain_tx_cq(device, cq_index); 901 } 902 /* #warning "it is assumed here that arming CQ only once its empty" * 903 * " would not cause interrupts to be missed" */ 904 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 905 906 completed_tx += iser_drain_tx_cq(device, cq_index); 907 iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); 908 } 909 910 static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 911 { 912 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context; 913 struct iser_device *device = cq_desc->device; 914 int cq_index = cq_desc->cq_index; 915 916 tasklet_schedule(&device->cq_tasklet[cq_index]); 917 } 918