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_info("using %d CQs, device %s supports %d vectors\n", 78 device->cqs_used, device->ib_device->name, 79 device->ib_device->num_comp_vectors); 80 81 device->cq_desc = kmalloc(sizeof(struct iser_cq_desc) * device->cqs_used, 82 GFP_KERNEL); 83 if (device->cq_desc == NULL) 84 goto cq_desc_err; 85 cq_desc = device->cq_desc; 86 87 device->pd = ib_alloc_pd(device->ib_device); 88 if (IS_ERR(device->pd)) 89 goto pd_err; 90 91 for (i = 0; i < device->cqs_used; i++) { 92 cq_desc[i].device = device; 93 cq_desc[i].cq_index = i; 94 95 device->rx_cq[i] = ib_create_cq(device->ib_device, 96 iser_cq_callback, 97 iser_cq_event_callback, 98 (void *)&cq_desc[i], 99 ISER_MAX_RX_CQ_LEN, i); 100 if (IS_ERR(device->rx_cq[i])) 101 goto cq_err; 102 103 device->tx_cq[i] = ib_create_cq(device->ib_device, 104 NULL, iser_cq_event_callback, 105 (void *)&cq_desc[i], 106 ISER_MAX_TX_CQ_LEN, i); 107 108 if (IS_ERR(device->tx_cq[i])) 109 goto cq_err; 110 111 if (ib_req_notify_cq(device->rx_cq[i], IB_CQ_NEXT_COMP)) 112 goto cq_err; 113 114 tasklet_init(&device->cq_tasklet[i], 115 iser_cq_tasklet_fn, 116 (unsigned long)&cq_desc[i]); 117 } 118 119 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE | 120 IB_ACCESS_REMOTE_WRITE | 121 IB_ACCESS_REMOTE_READ); 122 if (IS_ERR(device->mr)) 123 goto dma_mr_err; 124 125 INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device, 126 iser_event_handler); 127 if (ib_register_event_handler(&device->event_handler)) 128 goto handler_err; 129 130 return 0; 131 132 handler_err: 133 ib_dereg_mr(device->mr); 134 dma_mr_err: 135 for (j = 0; j < device->cqs_used; j++) 136 tasklet_kill(&device->cq_tasklet[j]); 137 cq_err: 138 for (j = 0; j < i; j++) { 139 if (device->tx_cq[j]) 140 ib_destroy_cq(device->tx_cq[j]); 141 if (device->rx_cq[j]) 142 ib_destroy_cq(device->rx_cq[j]); 143 } 144 ib_dealloc_pd(device->pd); 145 pd_err: 146 kfree(device->cq_desc); 147 cq_desc_err: 148 iser_err("failed to allocate an IB resource\n"); 149 return -1; 150 } 151 152 /** 153 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR, 154 * CQ and PD created with the device associated with the adapator. 155 */ 156 static void iser_free_device_ib_res(struct iser_device *device) 157 { 158 int i; 159 BUG_ON(device->mr == NULL); 160 161 for (i = 0; i < device->cqs_used; i++) { 162 tasklet_kill(&device->cq_tasklet[i]); 163 (void)ib_destroy_cq(device->tx_cq[i]); 164 (void)ib_destroy_cq(device->rx_cq[i]); 165 device->tx_cq[i] = NULL; 166 device->rx_cq[i] = NULL; 167 } 168 169 (void)ib_unregister_event_handler(&device->event_handler); 170 (void)ib_dereg_mr(device->mr); 171 (void)ib_dealloc_pd(device->pd); 172 173 kfree(device->cq_desc); 174 175 device->mr = NULL; 176 device->pd = NULL; 177 } 178 179 /** 180 * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP) 181 * 182 * returns 0 on success, -1 on failure 183 */ 184 static int iser_create_ib_conn_res(struct iser_conn *ib_conn) 185 { 186 struct iser_device *device; 187 struct ib_qp_init_attr init_attr; 188 int req_err, resp_err, ret = -ENOMEM; 189 struct ib_fmr_pool_param params; 190 int index, min_index = 0; 191 192 BUG_ON(ib_conn->device == NULL); 193 194 device = ib_conn->device; 195 196 ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 197 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 198 if (!ib_conn->login_buf) 199 goto out_err; 200 201 ib_conn->login_req_buf = ib_conn->login_buf; 202 ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN; 203 204 ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device, 205 (void *)ib_conn->login_req_buf, 206 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 207 208 ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device, 209 (void *)ib_conn->login_resp_buf, 210 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 211 212 req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma); 213 resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma); 214 215 if (req_err || resp_err) { 216 if (req_err) 217 ib_conn->login_req_dma = 0; 218 if (resp_err) 219 ib_conn->login_resp_dma = 0; 220 goto out_err; 221 } 222 223 ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) + 224 (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)), 225 GFP_KERNEL); 226 if (!ib_conn->page_vec) 227 goto out_err; 228 229 ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1); 230 231 params.page_shift = SHIFT_4K; 232 /* when the first/last SG element are not start/end * 233 * page aligned, the map whould be of N+1 pages */ 234 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1; 235 /* make the pool size twice the max number of SCSI commands * 236 * the ML is expected to queue, watermark for unmap at 50% */ 237 params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2; 238 params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX; 239 params.cache = 0; 240 params.flush_function = NULL; 241 params.access = (IB_ACCESS_LOCAL_WRITE | 242 IB_ACCESS_REMOTE_WRITE | 243 IB_ACCESS_REMOTE_READ); 244 245 ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms); 246 ret = PTR_ERR(ib_conn->fmr_pool); 247 if (IS_ERR(ib_conn->fmr_pool) && ret != -ENOSYS) { 248 ib_conn->fmr_pool = NULL; 249 goto out_err; 250 } else if (ret == -ENOSYS) { 251 ib_conn->fmr_pool = NULL; 252 iser_warn("FMRs are not supported, using unaligned mode\n"); 253 ret = 0; 254 } 255 256 memset(&init_attr, 0, sizeof init_attr); 257 258 mutex_lock(&ig.connlist_mutex); 259 /* select the CQ with the minimal number of usages */ 260 for (index = 0; index < device->cqs_used; index++) 261 if (device->cq_active_qps[index] < 262 device->cq_active_qps[min_index]) 263 min_index = index; 264 device->cq_active_qps[min_index]++; 265 mutex_unlock(&ig.connlist_mutex); 266 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn); 267 268 init_attr.event_handler = iser_qp_event_callback; 269 init_attr.qp_context = (void *)ib_conn; 270 init_attr.send_cq = device->tx_cq[min_index]; 271 init_attr.recv_cq = device->rx_cq[min_index]; 272 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS; 273 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS; 274 init_attr.cap.max_send_sge = 2; 275 init_attr.cap.max_recv_sge = 1; 276 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR; 277 init_attr.qp_type = IB_QPT_RC; 278 279 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr); 280 if (ret) 281 goto out_err; 282 283 ib_conn->qp = ib_conn->cma_id->qp; 284 iser_info("setting conn %p cma_id %p: fmr_pool %p qp %p\n", 285 ib_conn, ib_conn->cma_id, 286 ib_conn->fmr_pool, ib_conn->cma_id->qp); 287 return ret; 288 289 out_err: 290 iser_err("unable to alloc mem or create resource, err %d\n", ret); 291 return ret; 292 } 293 294 /** 295 * releases the FMR pool, QP and CMA ID objects, returns 0 on success, 296 * -1 on failure 297 */ 298 static int iser_free_ib_conn_res(struct iser_conn *ib_conn, int can_destroy_id) 299 { 300 int cq_index; 301 BUG_ON(ib_conn == NULL); 302 303 iser_info("freeing conn %p cma_id %p fmr pool %p qp %p\n", 304 ib_conn, ib_conn->cma_id, 305 ib_conn->fmr_pool, ib_conn->qp); 306 307 /* qp is created only once both addr & route are resolved */ 308 if (ib_conn->fmr_pool != NULL) 309 ib_destroy_fmr_pool(ib_conn->fmr_pool); 310 311 if (ib_conn->qp != NULL) { 312 cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index; 313 ib_conn->device->cq_active_qps[cq_index]--; 314 315 rdma_destroy_qp(ib_conn->cma_id); 316 } 317 /* if cma handler context, the caller acts s.t the cma destroy the id */ 318 if (ib_conn->cma_id != NULL && can_destroy_id) 319 rdma_destroy_id(ib_conn->cma_id); 320 321 ib_conn->fmr_pool = NULL; 322 ib_conn->qp = NULL; 323 ib_conn->cma_id = NULL; 324 kfree(ib_conn->page_vec); 325 326 if (ib_conn->login_buf) { 327 if (ib_conn->login_req_dma) 328 ib_dma_unmap_single(ib_conn->device->ib_device, 329 ib_conn->login_req_dma, 330 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); 331 if (ib_conn->login_resp_dma) 332 ib_dma_unmap_single(ib_conn->device->ib_device, 333 ib_conn->login_resp_dma, 334 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); 335 kfree(ib_conn->login_buf); 336 } 337 338 return 0; 339 } 340 341 /** 342 * based on the resolved device node GUID see if there already allocated 343 * device for this device. If there's no such, create one. 344 */ 345 static 346 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id) 347 { 348 struct iser_device *device; 349 350 mutex_lock(&ig.device_list_mutex); 351 352 list_for_each_entry(device, &ig.device_list, ig_list) 353 /* find if there's a match using the node GUID */ 354 if (device->ib_device->node_guid == cma_id->device->node_guid) 355 goto inc_refcnt; 356 357 device = kzalloc(sizeof *device, GFP_KERNEL); 358 if (device == NULL) 359 goto out; 360 361 /* assign this device to the device */ 362 device->ib_device = cma_id->device; 363 /* init the device and link it into ig device list */ 364 if (iser_create_device_ib_res(device)) { 365 kfree(device); 366 device = NULL; 367 goto out; 368 } 369 list_add(&device->ig_list, &ig.device_list); 370 371 inc_refcnt: 372 device->refcount++; 373 out: 374 mutex_unlock(&ig.device_list_mutex); 375 return device; 376 } 377 378 /* if there's no demand for this device, release it */ 379 static void iser_device_try_release(struct iser_device *device) 380 { 381 mutex_lock(&ig.device_list_mutex); 382 device->refcount--; 383 iser_info("device %p refcount %d\n", device, device->refcount); 384 if (!device->refcount) { 385 iser_free_device_ib_res(device); 386 list_del(&device->ig_list); 387 kfree(device); 388 } 389 mutex_unlock(&ig.device_list_mutex); 390 } 391 392 static int iser_conn_state_comp_exch(struct iser_conn *ib_conn, 393 enum iser_ib_conn_state comp, 394 enum iser_ib_conn_state exch) 395 { 396 int ret; 397 398 spin_lock_bh(&ib_conn->lock); 399 if ((ret = (ib_conn->state == comp))) 400 ib_conn->state = exch; 401 spin_unlock_bh(&ib_conn->lock); 402 return ret; 403 } 404 405 /** 406 * Frees all conn objects and deallocs conn descriptor 407 */ 408 static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id) 409 { 410 struct iser_device *device = ib_conn->device; 411 412 BUG_ON(ib_conn->state != ISER_CONN_DOWN); 413 414 mutex_lock(&ig.connlist_mutex); 415 list_del(&ib_conn->conn_list); 416 mutex_unlock(&ig.connlist_mutex); 417 iser_free_rx_descriptors(ib_conn); 418 iser_free_ib_conn_res(ib_conn, can_destroy_id); 419 ib_conn->device = NULL; 420 /* on EVENT_ADDR_ERROR there's no device yet for this conn */ 421 if (device != NULL) 422 iser_device_try_release(device); 423 iscsi_destroy_endpoint(ib_conn->ep); 424 } 425 426 void iser_conn_get(struct iser_conn *ib_conn) 427 { 428 atomic_inc(&ib_conn->refcount); 429 } 430 431 int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id) 432 { 433 if (atomic_dec_and_test(&ib_conn->refcount)) { 434 iser_conn_release(ib_conn, can_destroy_id); 435 return 1; 436 } 437 return 0; 438 } 439 440 /** 441 * triggers start of the disconnect procedures and wait for them to be done 442 */ 443 void iser_conn_terminate(struct iser_conn *ib_conn) 444 { 445 int err = 0; 446 447 /* change the ib conn state only if the conn is UP, however always call 448 * rdma_disconnect since this is the only way to cause the CMA to change 449 * the QP state to ERROR 450 */ 451 452 iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING); 453 err = rdma_disconnect(ib_conn->cma_id); 454 if (err) 455 iser_err("Failed to disconnect, conn: 0x%p err %d\n", 456 ib_conn,err); 457 458 wait_event_interruptible(ib_conn->wait, 459 ib_conn->state == ISER_CONN_DOWN); 460 461 iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ 462 } 463 464 static int iser_connect_error(struct rdma_cm_id *cma_id) 465 { 466 struct iser_conn *ib_conn; 467 ib_conn = (struct iser_conn *)cma_id->context; 468 469 ib_conn->state = ISER_CONN_DOWN; 470 wake_up_interruptible(&ib_conn->wait); 471 return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 472 } 473 474 static int iser_addr_handler(struct rdma_cm_id *cma_id) 475 { 476 struct iser_device *device; 477 struct iser_conn *ib_conn; 478 int ret; 479 480 device = iser_device_find_by_ib_device(cma_id); 481 if (!device) { 482 iser_err("device lookup/creation failed\n"); 483 return iser_connect_error(cma_id); 484 } 485 486 ib_conn = (struct iser_conn *)cma_id->context; 487 ib_conn->device = device; 488 489 ret = rdma_resolve_route(cma_id, 1000); 490 if (ret) { 491 iser_err("resolve route failed: %d\n", ret); 492 return iser_connect_error(cma_id); 493 } 494 495 return 0; 496 } 497 498 static int iser_route_handler(struct rdma_cm_id *cma_id) 499 { 500 struct rdma_conn_param conn_param; 501 int ret; 502 struct iser_cm_hdr req_hdr; 503 504 ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context); 505 if (ret) 506 goto failure; 507 508 memset(&conn_param, 0, sizeof conn_param); 509 conn_param.responder_resources = 4; 510 conn_param.initiator_depth = 1; 511 conn_param.retry_count = 7; 512 conn_param.rnr_retry_count = 6; 513 514 memset(&req_hdr, 0, sizeof(req_hdr)); 515 req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED | 516 ISER_SEND_W_INV_NOT_SUPPORTED); 517 conn_param.private_data = (void *)&req_hdr; 518 conn_param.private_data_len = sizeof(struct iser_cm_hdr); 519 520 ret = rdma_connect(cma_id, &conn_param); 521 if (ret) { 522 iser_err("failure connecting: %d\n", ret); 523 goto failure; 524 } 525 526 return 0; 527 failure: 528 return iser_connect_error(cma_id); 529 } 530 531 static void iser_connected_handler(struct rdma_cm_id *cma_id) 532 { 533 struct iser_conn *ib_conn; 534 535 ib_conn = (struct iser_conn *)cma_id->context; 536 ib_conn->state = ISER_CONN_UP; 537 wake_up_interruptible(&ib_conn->wait); 538 } 539 540 static int iser_disconnected_handler(struct rdma_cm_id *cma_id) 541 { 542 struct iser_conn *ib_conn; 543 int ret; 544 545 ib_conn = (struct iser_conn *)cma_id->context; 546 547 /* getting here when the state is UP means that the conn is being * 548 * terminated asynchronously from the iSCSI layer's perspective. */ 549 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 550 ISER_CONN_TERMINATING)) 551 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 552 ISCSI_ERR_CONN_FAILED); 553 554 /* Complete the termination process if no posts are pending */ 555 if (ib_conn->post_recv_buf_count == 0 && 556 (atomic_read(&ib_conn->post_send_buf_count) == 0)) { 557 ib_conn->state = ISER_CONN_DOWN; 558 wake_up_interruptible(&ib_conn->wait); 559 } 560 561 ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */ 562 return ret; 563 } 564 565 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 566 { 567 int ret = 0; 568 569 iser_info("event %d status %d conn %p id %p\n", 570 event->event, event->status, cma_id->context, cma_id); 571 572 switch (event->event) { 573 case RDMA_CM_EVENT_ADDR_RESOLVED: 574 ret = iser_addr_handler(cma_id); 575 break; 576 case RDMA_CM_EVENT_ROUTE_RESOLVED: 577 ret = iser_route_handler(cma_id); 578 break; 579 case RDMA_CM_EVENT_ESTABLISHED: 580 iser_connected_handler(cma_id); 581 break; 582 case RDMA_CM_EVENT_ADDR_ERROR: 583 case RDMA_CM_EVENT_ROUTE_ERROR: 584 case RDMA_CM_EVENT_CONNECT_ERROR: 585 case RDMA_CM_EVENT_UNREACHABLE: 586 case RDMA_CM_EVENT_REJECTED: 587 ret = iser_connect_error(cma_id); 588 break; 589 case RDMA_CM_EVENT_DISCONNECTED: 590 case RDMA_CM_EVENT_DEVICE_REMOVAL: 591 case RDMA_CM_EVENT_ADDR_CHANGE: 592 ret = iser_disconnected_handler(cma_id); 593 break; 594 default: 595 iser_err("Unexpected RDMA CM event (%d)\n", event->event); 596 break; 597 } 598 return ret; 599 } 600 601 void iser_conn_init(struct iser_conn *ib_conn) 602 { 603 ib_conn->state = ISER_CONN_INIT; 604 init_waitqueue_head(&ib_conn->wait); 605 ib_conn->post_recv_buf_count = 0; 606 atomic_set(&ib_conn->post_send_buf_count, 0); 607 atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */ 608 INIT_LIST_HEAD(&ib_conn->conn_list); 609 spin_lock_init(&ib_conn->lock); 610 } 611 612 /** 613 * starts the process of connecting to the target 614 * sleeps until the connection is established or rejected 615 */ 616 int iser_connect(struct iser_conn *ib_conn, 617 struct sockaddr_in *src_addr, 618 struct sockaddr_in *dst_addr, 619 int non_blocking) 620 { 621 struct sockaddr *src, *dst; 622 int err = 0; 623 624 sprintf(ib_conn->name, "%pI4:%d", 625 &dst_addr->sin_addr.s_addr, dst_addr->sin_port); 626 627 /* the device is known only --after-- address resolution */ 628 ib_conn->device = NULL; 629 630 iser_info("connecting to: %pI4, port 0x%x\n", 631 &dst_addr->sin_addr, dst_addr->sin_port); 632 633 ib_conn->state = ISER_CONN_PENDING; 634 635 iser_conn_get(ib_conn); /* ref ib conn's cma id */ 636 ib_conn->cma_id = rdma_create_id(iser_cma_handler, 637 (void *)ib_conn, 638 RDMA_PS_TCP, IB_QPT_RC); 639 if (IS_ERR(ib_conn->cma_id)) { 640 err = PTR_ERR(ib_conn->cma_id); 641 iser_err("rdma_create_id failed: %d\n", err); 642 goto id_failure; 643 } 644 645 src = (struct sockaddr *)src_addr; 646 dst = (struct sockaddr *)dst_addr; 647 err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000); 648 if (err) { 649 iser_err("rdma_resolve_addr failed: %d\n", err); 650 goto addr_failure; 651 } 652 653 if (!non_blocking) { 654 wait_event_interruptible(ib_conn->wait, 655 (ib_conn->state != ISER_CONN_PENDING)); 656 657 if (ib_conn->state != ISER_CONN_UP) { 658 err = -EIO; 659 goto connect_failure; 660 } 661 } 662 663 mutex_lock(&ig.connlist_mutex); 664 list_add(&ib_conn->conn_list, &ig.connlist); 665 mutex_unlock(&ig.connlist_mutex); 666 return 0; 667 668 id_failure: 669 ib_conn->cma_id = NULL; 670 addr_failure: 671 ib_conn->state = ISER_CONN_DOWN; 672 iser_conn_put(ib_conn, 1); /* deref ib conn's cma id */ 673 connect_failure: 674 iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */ 675 return err; 676 } 677 678 /** 679 * iser_reg_page_vec - Register physical memory 680 * 681 * returns: 0 on success, errno code on failure 682 */ 683 int iser_reg_page_vec(struct iser_conn *ib_conn, 684 struct iser_page_vec *page_vec, 685 struct iser_mem_reg *mem_reg) 686 { 687 struct ib_pool_fmr *mem; 688 u64 io_addr; 689 u64 *page_list; 690 int status; 691 692 page_list = page_vec->pages; 693 io_addr = page_list[0]; 694 695 mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool, 696 page_list, 697 page_vec->length, 698 io_addr); 699 700 if (IS_ERR(mem)) { 701 status = (int)PTR_ERR(mem); 702 iser_err("ib_fmr_pool_map_phys failed: %d\n", status); 703 return status; 704 } 705 706 mem_reg->lkey = mem->fmr->lkey; 707 mem_reg->rkey = mem->fmr->rkey; 708 mem_reg->len = page_vec->length * SIZE_4K; 709 mem_reg->va = io_addr; 710 mem_reg->is_fmr = 1; 711 mem_reg->mem_h = (void *)mem; 712 713 mem_reg->va += page_vec->offset; 714 mem_reg->len = page_vec->data_size; 715 716 iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, " 717 "entry[0]: (0x%08lx,%ld)] -> " 718 "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n", 719 page_vec, page_vec->length, 720 (unsigned long)page_vec->pages[0], 721 (unsigned long)page_vec->data_size, 722 (unsigned int)mem_reg->lkey, mem_reg->mem_h, 723 (unsigned long)mem_reg->va, (unsigned long)mem_reg->len); 724 return 0; 725 } 726 727 /** 728 * Unregister (previosuly registered) memory. 729 */ 730 void iser_unreg_mem(struct iser_mem_reg *reg) 731 { 732 int ret; 733 734 iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h); 735 736 ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h); 737 if (ret) 738 iser_err("ib_fmr_pool_unmap failed %d\n", ret); 739 740 reg->mem_h = NULL; 741 } 742 743 int iser_post_recvl(struct iser_conn *ib_conn) 744 { 745 struct ib_recv_wr rx_wr, *rx_wr_failed; 746 struct ib_sge sge; 747 int ib_ret; 748 749 sge.addr = ib_conn->login_resp_dma; 750 sge.length = ISER_RX_LOGIN_SIZE; 751 sge.lkey = ib_conn->device->mr->lkey; 752 753 rx_wr.wr_id = (unsigned long)ib_conn->login_resp_buf; 754 rx_wr.sg_list = &sge; 755 rx_wr.num_sge = 1; 756 rx_wr.next = NULL; 757 758 ib_conn->post_recv_buf_count++; 759 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed); 760 if (ib_ret) { 761 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 762 ib_conn->post_recv_buf_count--; 763 } 764 return ib_ret; 765 } 766 767 int iser_post_recvm(struct iser_conn *ib_conn, int count) 768 { 769 struct ib_recv_wr *rx_wr, *rx_wr_failed; 770 int i, ib_ret; 771 unsigned int my_rx_head = ib_conn->rx_desc_head; 772 struct iser_rx_desc *rx_desc; 773 774 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 775 rx_desc = &ib_conn->rx_descs[my_rx_head]; 776 rx_wr->wr_id = (unsigned long)rx_desc; 777 rx_wr->sg_list = &rx_desc->rx_sg; 778 rx_wr->num_sge = 1; 779 rx_wr->next = rx_wr + 1; 780 my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1); 781 } 782 783 rx_wr--; 784 rx_wr->next = NULL; /* mark end of work requests list */ 785 786 ib_conn->post_recv_buf_count += count; 787 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed); 788 if (ib_ret) { 789 iser_err("ib_post_recv failed ret=%d\n", ib_ret); 790 ib_conn->post_recv_buf_count -= count; 791 } else 792 ib_conn->rx_desc_head = my_rx_head; 793 return ib_ret; 794 } 795 796 797 /** 798 * iser_start_send - Initiate a Send DTO operation 799 * 800 * returns 0 on success, -1 on failure 801 */ 802 int iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc) 803 { 804 int ib_ret; 805 struct ib_send_wr send_wr, *send_wr_failed; 806 807 ib_dma_sync_single_for_device(ib_conn->device->ib_device, 808 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); 809 810 send_wr.next = NULL; 811 send_wr.wr_id = (unsigned long)tx_desc; 812 send_wr.sg_list = tx_desc->tx_sg; 813 send_wr.num_sge = tx_desc->num_sge; 814 send_wr.opcode = IB_WR_SEND; 815 send_wr.send_flags = IB_SEND_SIGNALED; 816 817 atomic_inc(&ib_conn->post_send_buf_count); 818 819 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed); 820 if (ib_ret) { 821 iser_err("ib_post_send failed, ret:%d\n", ib_ret); 822 atomic_dec(&ib_conn->post_send_buf_count); 823 } 824 return ib_ret; 825 } 826 827 static void iser_handle_comp_error(struct iser_tx_desc *desc, 828 struct iser_conn *ib_conn) 829 { 830 if (desc && desc->type == ISCSI_TX_DATAOUT) 831 kmem_cache_free(ig.desc_cache, desc); 832 833 if (ib_conn->post_recv_buf_count == 0 && 834 atomic_read(&ib_conn->post_send_buf_count) == 0) { 835 /* getting here when the state is UP means that the conn is * 836 * being terminated asynchronously from the iSCSI layer's * 837 * perspective. */ 838 if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, 839 ISER_CONN_TERMINATING)) 840 iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn, 841 ISCSI_ERR_CONN_FAILED); 842 843 /* no more non completed posts to the QP, complete the 844 * termination process w.o worrying on disconnect event */ 845 ib_conn->state = ISER_CONN_DOWN; 846 wake_up_interruptible(&ib_conn->wait); 847 } 848 } 849 850 static int iser_drain_tx_cq(struct iser_device *device, int cq_index) 851 { 852 struct ib_cq *cq = device->tx_cq[cq_index]; 853 struct ib_wc wc; 854 struct iser_tx_desc *tx_desc; 855 struct iser_conn *ib_conn; 856 int completed_tx = 0; 857 858 while (ib_poll_cq(cq, 1, &wc) == 1) { 859 tx_desc = (struct iser_tx_desc *) (unsigned long) wc.wr_id; 860 ib_conn = wc.qp->qp_context; 861 if (wc.status == IB_WC_SUCCESS) { 862 if (wc.opcode == IB_WC_SEND) 863 iser_snd_completion(tx_desc, ib_conn); 864 else 865 iser_err("expected opcode %d got %d\n", 866 IB_WC_SEND, wc.opcode); 867 } else { 868 iser_err("tx id %llx status %d vend_err %x\n", 869 wc.wr_id, wc.status, wc.vendor_err); 870 atomic_dec(&ib_conn->post_send_buf_count); 871 iser_handle_comp_error(tx_desc, ib_conn); 872 } 873 completed_tx++; 874 } 875 return completed_tx; 876 } 877 878 879 static void iser_cq_tasklet_fn(unsigned long data) 880 { 881 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)data; 882 struct iser_device *device = cq_desc->device; 883 int cq_index = cq_desc->cq_index; 884 struct ib_cq *cq = device->rx_cq[cq_index]; 885 struct ib_wc wc; 886 struct iser_rx_desc *desc; 887 unsigned long xfer_len; 888 struct iser_conn *ib_conn; 889 int completed_tx, completed_rx; 890 completed_tx = completed_rx = 0; 891 892 while (ib_poll_cq(cq, 1, &wc) == 1) { 893 desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id; 894 BUG_ON(desc == NULL); 895 ib_conn = wc.qp->qp_context; 896 if (wc.status == IB_WC_SUCCESS) { 897 if (wc.opcode == IB_WC_RECV) { 898 xfer_len = (unsigned long)wc.byte_len; 899 iser_rcv_completion(desc, xfer_len, ib_conn); 900 } else 901 iser_err("expected opcode %d got %d\n", 902 IB_WC_RECV, wc.opcode); 903 } else { 904 if (wc.status != IB_WC_WR_FLUSH_ERR) 905 iser_err("rx id %llx status %d vend_err %x\n", 906 wc.wr_id, wc.status, wc.vendor_err); 907 ib_conn->post_recv_buf_count--; 908 iser_handle_comp_error(NULL, ib_conn); 909 } 910 completed_rx++; 911 if (!(completed_rx & 63)) 912 completed_tx += iser_drain_tx_cq(device, cq_index); 913 } 914 /* #warning "it is assumed here that arming CQ only once its empty" * 915 * " would not cause interrupts to be missed" */ 916 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); 917 918 completed_tx += iser_drain_tx_cq(device, cq_index); 919 iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx); 920 } 921 922 static void iser_cq_callback(struct ib_cq *cq, void *cq_context) 923 { 924 struct iser_cq_desc *cq_desc = (struct iser_cq_desc *)cq_context; 925 struct iser_device *device = cq_desc->device; 926 int cq_index = cq_desc->cq_index; 927 928 tasklet_schedule(&device->cq_tasklet[cq_index]); 929 } 930