1 /******************************************************************************* 2 * This file contains iSCSI extentions for RDMA (iSER) Verbs 3 * 4 * (c) Copyright 2013 Datera, Inc. 5 * 6 * Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ****************************************************************************/ 18 19 #include <linux/string.h> 20 #include <linux/module.h> 21 #include <linux/scatterlist.h> 22 #include <linux/socket.h> 23 #include <linux/in.h> 24 #include <linux/in6.h> 25 #include <rdma/ib_verbs.h> 26 #include <rdma/rdma_cm.h> 27 #include <target/target_core_base.h> 28 #include <target/target_core_fabric.h> 29 #include <target/iscsi/iscsi_transport.h> 30 #include <linux/semaphore.h> 31 32 #include "isert_proto.h" 33 #include "ib_isert.h" 34 35 #define ISERT_MAX_CONN 8 36 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN) 37 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN) 38 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \ 39 ISERT_MAX_CONN) 40 41 static int isert_debug_level; 42 module_param_named(debug_level, isert_debug_level, int, 0644); 43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)"); 44 45 static DEFINE_MUTEX(device_list_mutex); 46 static LIST_HEAD(device_list); 47 static struct workqueue_struct *isert_comp_wq; 48 static struct workqueue_struct *isert_release_wq; 49 50 static void 51 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); 52 static int 53 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 54 struct isert_rdma_wr *wr); 55 static void 56 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn); 57 static int 58 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 59 struct isert_rdma_wr *wr); 60 static int 61 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd); 62 static int 63 isert_rdma_post_recvl(struct isert_conn *isert_conn); 64 static int 65 isert_rdma_accept(struct isert_conn *isert_conn); 66 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np); 67 68 static void isert_release_work(struct work_struct *work); 69 70 static inline bool 71 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd) 72 { 73 return (conn->pi_support && 74 cmd->prot_op != TARGET_PROT_NORMAL); 75 } 76 77 78 static void 79 isert_qp_event_callback(struct ib_event *e, void *context) 80 { 81 struct isert_conn *isert_conn = context; 82 83 isert_err("%s (%d): conn %p\n", 84 ib_event_msg(e->event), e->event, isert_conn); 85 86 switch (e->event) { 87 case IB_EVENT_COMM_EST: 88 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST); 89 break; 90 case IB_EVENT_QP_LAST_WQE_REACHED: 91 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n"); 92 break; 93 default: 94 break; 95 } 96 } 97 98 static int 99 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr) 100 { 101 int ret; 102 103 ret = ib_query_device(ib_dev, devattr); 104 if (ret) { 105 isert_err("ib_query_device() failed: %d\n", ret); 106 return ret; 107 } 108 isert_dbg("devattr->max_sge: %d\n", devattr->max_sge); 109 isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd); 110 111 return 0; 112 } 113 114 static struct isert_comp * 115 isert_comp_get(struct isert_conn *isert_conn) 116 { 117 struct isert_device *device = isert_conn->device; 118 struct isert_comp *comp; 119 int i, min = 0; 120 121 mutex_lock(&device_list_mutex); 122 for (i = 0; i < device->comps_used; i++) 123 if (device->comps[i].active_qps < 124 device->comps[min].active_qps) 125 min = i; 126 comp = &device->comps[min]; 127 comp->active_qps++; 128 mutex_unlock(&device_list_mutex); 129 130 isert_info("conn %p, using comp %p min_index: %d\n", 131 isert_conn, comp, min); 132 133 return comp; 134 } 135 136 static void 137 isert_comp_put(struct isert_comp *comp) 138 { 139 mutex_lock(&device_list_mutex); 140 comp->active_qps--; 141 mutex_unlock(&device_list_mutex); 142 } 143 144 static struct ib_qp * 145 isert_create_qp(struct isert_conn *isert_conn, 146 struct isert_comp *comp, 147 struct rdma_cm_id *cma_id) 148 { 149 struct isert_device *device = isert_conn->device; 150 struct ib_qp_init_attr attr; 151 int ret; 152 153 memset(&attr, 0, sizeof(struct ib_qp_init_attr)); 154 attr.event_handler = isert_qp_event_callback; 155 attr.qp_context = isert_conn; 156 attr.send_cq = comp->cq; 157 attr.recv_cq = comp->cq; 158 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS; 159 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1; 160 /* 161 * FIXME: Use devattr.max_sge - 2 for max_send_sge as 162 * work-around for RDMA_READs with ConnectX-2. 163 * 164 * Also, still make sure to have at least two SGEs for 165 * outgoing control PDU responses. 166 */ 167 attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2); 168 isert_conn->max_sge = attr.cap.max_send_sge; 169 170 attr.cap.max_recv_sge = 1; 171 attr.sq_sig_type = IB_SIGNAL_REQ_WR; 172 attr.qp_type = IB_QPT_RC; 173 if (device->pi_capable) 174 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN; 175 176 ret = rdma_create_qp(cma_id, device->pd, &attr); 177 if (ret) { 178 isert_err("rdma_create_qp failed for cma_id %d\n", ret); 179 return ERR_PTR(ret); 180 } 181 182 return cma_id->qp; 183 } 184 185 static int 186 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id) 187 { 188 struct isert_comp *comp; 189 int ret; 190 191 comp = isert_comp_get(isert_conn); 192 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id); 193 if (IS_ERR(isert_conn->qp)) { 194 ret = PTR_ERR(isert_conn->qp); 195 goto err; 196 } 197 198 return 0; 199 err: 200 isert_comp_put(comp); 201 return ret; 202 } 203 204 static void 205 isert_cq_event_callback(struct ib_event *e, void *context) 206 { 207 isert_dbg("event: %d\n", e->event); 208 } 209 210 static int 211 isert_alloc_rx_descriptors(struct isert_conn *isert_conn) 212 { 213 struct isert_device *device = isert_conn->device; 214 struct ib_device *ib_dev = device->ib_device; 215 struct iser_rx_desc *rx_desc; 216 struct ib_sge *rx_sg; 217 u64 dma_addr; 218 int i, j; 219 220 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS * 221 sizeof(struct iser_rx_desc), GFP_KERNEL); 222 if (!isert_conn->rx_descs) 223 goto fail; 224 225 rx_desc = isert_conn->rx_descs; 226 227 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 228 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc, 229 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 230 if (ib_dma_mapping_error(ib_dev, dma_addr)) 231 goto dma_map_fail; 232 233 rx_desc->dma_addr = dma_addr; 234 235 rx_sg = &rx_desc->rx_sg; 236 rx_sg->addr = rx_desc->dma_addr; 237 rx_sg->length = ISER_RX_PAYLOAD_SIZE; 238 rx_sg->lkey = device->pd->local_dma_lkey; 239 } 240 241 isert_conn->rx_desc_head = 0; 242 243 return 0; 244 245 dma_map_fail: 246 rx_desc = isert_conn->rx_descs; 247 for (j = 0; j < i; j++, rx_desc++) { 248 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 249 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 250 } 251 kfree(isert_conn->rx_descs); 252 isert_conn->rx_descs = NULL; 253 fail: 254 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn); 255 256 return -ENOMEM; 257 } 258 259 static void 260 isert_free_rx_descriptors(struct isert_conn *isert_conn) 261 { 262 struct ib_device *ib_dev = isert_conn->device->ib_device; 263 struct iser_rx_desc *rx_desc; 264 int i; 265 266 if (!isert_conn->rx_descs) 267 return; 268 269 rx_desc = isert_conn->rx_descs; 270 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) { 271 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr, 272 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); 273 } 274 275 kfree(isert_conn->rx_descs); 276 isert_conn->rx_descs = NULL; 277 } 278 279 static void isert_cq_work(struct work_struct *); 280 static void isert_cq_callback(struct ib_cq *, void *); 281 282 static void 283 isert_free_comps(struct isert_device *device) 284 { 285 int i; 286 287 for (i = 0; i < device->comps_used; i++) { 288 struct isert_comp *comp = &device->comps[i]; 289 290 if (comp->cq) { 291 cancel_work_sync(&comp->work); 292 ib_destroy_cq(comp->cq); 293 } 294 } 295 kfree(device->comps); 296 } 297 298 static int 299 isert_alloc_comps(struct isert_device *device, 300 struct ib_device_attr *attr) 301 { 302 int i, max_cqe, ret = 0; 303 304 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(), 305 device->ib_device->num_comp_vectors)); 306 307 isert_info("Using %d CQs, %s supports %d vectors support " 308 "Fast registration %d pi_capable %d\n", 309 device->comps_used, device->ib_device->name, 310 device->ib_device->num_comp_vectors, device->use_fastreg, 311 device->pi_capable); 312 313 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp), 314 GFP_KERNEL); 315 if (!device->comps) { 316 isert_err("Unable to allocate completion contexts\n"); 317 return -ENOMEM; 318 } 319 320 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe); 321 322 for (i = 0; i < device->comps_used; i++) { 323 struct ib_cq_init_attr cq_attr = {}; 324 struct isert_comp *comp = &device->comps[i]; 325 326 comp->device = device; 327 INIT_WORK(&comp->work, isert_cq_work); 328 cq_attr.cqe = max_cqe; 329 cq_attr.comp_vector = i; 330 comp->cq = ib_create_cq(device->ib_device, 331 isert_cq_callback, 332 isert_cq_event_callback, 333 (void *)comp, 334 &cq_attr); 335 if (IS_ERR(comp->cq)) { 336 isert_err("Unable to allocate cq\n"); 337 ret = PTR_ERR(comp->cq); 338 comp->cq = NULL; 339 goto out_cq; 340 } 341 342 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); 343 if (ret) 344 goto out_cq; 345 } 346 347 return 0; 348 out_cq: 349 isert_free_comps(device); 350 return ret; 351 } 352 353 static int 354 isert_create_device_ib_res(struct isert_device *device) 355 { 356 struct ib_device_attr *dev_attr; 357 int ret; 358 359 dev_attr = &device->dev_attr; 360 ret = isert_query_device(device->ib_device, dev_attr); 361 if (ret) 362 return ret; 363 364 /* asign function handlers */ 365 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS && 366 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) { 367 device->use_fastreg = 1; 368 device->reg_rdma_mem = isert_reg_rdma; 369 device->unreg_rdma_mem = isert_unreg_rdma; 370 } else { 371 device->use_fastreg = 0; 372 device->reg_rdma_mem = isert_map_rdma; 373 device->unreg_rdma_mem = isert_unmap_cmd; 374 } 375 376 ret = isert_alloc_comps(device, dev_attr); 377 if (ret) 378 return ret; 379 380 device->pd = ib_alloc_pd(device->ib_device); 381 if (IS_ERR(device->pd)) { 382 ret = PTR_ERR(device->pd); 383 isert_err("failed to allocate pd, device %p, ret=%d\n", 384 device, ret); 385 goto out_cq; 386 } 387 388 /* Check signature cap */ 389 device->pi_capable = dev_attr->device_cap_flags & 390 IB_DEVICE_SIGNATURE_HANDOVER ? true : false; 391 392 return 0; 393 394 out_cq: 395 isert_free_comps(device); 396 return ret; 397 } 398 399 static void 400 isert_free_device_ib_res(struct isert_device *device) 401 { 402 isert_info("device %p\n", device); 403 404 ib_dealloc_pd(device->pd); 405 isert_free_comps(device); 406 } 407 408 static void 409 isert_device_put(struct isert_device *device) 410 { 411 mutex_lock(&device_list_mutex); 412 device->refcount--; 413 isert_info("device %p refcount %d\n", device, device->refcount); 414 if (!device->refcount) { 415 isert_free_device_ib_res(device); 416 list_del(&device->dev_node); 417 kfree(device); 418 } 419 mutex_unlock(&device_list_mutex); 420 } 421 422 static struct isert_device * 423 isert_device_get(struct rdma_cm_id *cma_id) 424 { 425 struct isert_device *device; 426 int ret; 427 428 mutex_lock(&device_list_mutex); 429 list_for_each_entry(device, &device_list, dev_node) { 430 if (device->ib_device->node_guid == cma_id->device->node_guid) { 431 device->refcount++; 432 isert_info("Found iser device %p refcount %d\n", 433 device, device->refcount); 434 mutex_unlock(&device_list_mutex); 435 return device; 436 } 437 } 438 439 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); 440 if (!device) { 441 mutex_unlock(&device_list_mutex); 442 return ERR_PTR(-ENOMEM); 443 } 444 445 INIT_LIST_HEAD(&device->dev_node); 446 447 device->ib_device = cma_id->device; 448 ret = isert_create_device_ib_res(device); 449 if (ret) { 450 kfree(device); 451 mutex_unlock(&device_list_mutex); 452 return ERR_PTR(ret); 453 } 454 455 device->refcount++; 456 list_add_tail(&device->dev_node, &device_list); 457 isert_info("Created a new iser device %p refcount %d\n", 458 device, device->refcount); 459 mutex_unlock(&device_list_mutex); 460 461 return device; 462 } 463 464 static void 465 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn) 466 { 467 struct fast_reg_descriptor *fr_desc, *tmp; 468 int i = 0; 469 470 if (list_empty(&isert_conn->fr_pool)) 471 return; 472 473 isert_info("Freeing conn %p fastreg pool", isert_conn); 474 475 list_for_each_entry_safe(fr_desc, tmp, 476 &isert_conn->fr_pool, list) { 477 list_del(&fr_desc->list); 478 ib_free_fast_reg_page_list(fr_desc->data_frpl); 479 ib_dereg_mr(fr_desc->data_mr); 480 if (fr_desc->pi_ctx) { 481 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl); 482 ib_dereg_mr(fr_desc->pi_ctx->prot_mr); 483 ib_dereg_mr(fr_desc->pi_ctx->sig_mr); 484 kfree(fr_desc->pi_ctx); 485 } 486 kfree(fr_desc); 487 ++i; 488 } 489 490 if (i < isert_conn->fr_pool_size) 491 isert_warn("Pool still has %d regions registered\n", 492 isert_conn->fr_pool_size - i); 493 } 494 495 static int 496 isert_create_pi_ctx(struct fast_reg_descriptor *desc, 497 struct ib_device *device, 498 struct ib_pd *pd) 499 { 500 struct pi_context *pi_ctx; 501 int ret; 502 503 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); 504 if (!pi_ctx) { 505 isert_err("Failed to allocate pi context\n"); 506 return -ENOMEM; 507 } 508 509 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device, 510 ISCSI_ISER_SG_TABLESIZE); 511 if (IS_ERR(pi_ctx->prot_frpl)) { 512 isert_err("Failed to allocate prot frpl err=%ld\n", 513 PTR_ERR(pi_ctx->prot_frpl)); 514 ret = PTR_ERR(pi_ctx->prot_frpl); 515 goto err_pi_ctx; 516 } 517 518 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 519 ISCSI_ISER_SG_TABLESIZE); 520 if (IS_ERR(pi_ctx->prot_mr)) { 521 isert_err("Failed to allocate prot frmr err=%ld\n", 522 PTR_ERR(pi_ctx->prot_mr)); 523 ret = PTR_ERR(pi_ctx->prot_mr); 524 goto err_prot_frpl; 525 } 526 desc->ind |= ISERT_PROT_KEY_VALID; 527 528 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2); 529 if (IS_ERR(pi_ctx->sig_mr)) { 530 isert_err("Failed to allocate signature enabled mr err=%ld\n", 531 PTR_ERR(pi_ctx->sig_mr)); 532 ret = PTR_ERR(pi_ctx->sig_mr); 533 goto err_prot_mr; 534 } 535 536 desc->pi_ctx = pi_ctx; 537 desc->ind |= ISERT_SIG_KEY_VALID; 538 desc->ind &= ~ISERT_PROTECTED; 539 540 return 0; 541 542 err_prot_mr: 543 ib_dereg_mr(pi_ctx->prot_mr); 544 err_prot_frpl: 545 ib_free_fast_reg_page_list(pi_ctx->prot_frpl); 546 err_pi_ctx: 547 kfree(pi_ctx); 548 549 return ret; 550 } 551 552 static int 553 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd, 554 struct fast_reg_descriptor *fr_desc) 555 { 556 int ret; 557 558 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, 559 ISCSI_ISER_SG_TABLESIZE); 560 if (IS_ERR(fr_desc->data_frpl)) { 561 isert_err("Failed to allocate data frpl err=%ld\n", 562 PTR_ERR(fr_desc->data_frpl)); 563 return PTR_ERR(fr_desc->data_frpl); 564 } 565 566 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 567 ISCSI_ISER_SG_TABLESIZE); 568 if (IS_ERR(fr_desc->data_mr)) { 569 isert_err("Failed to allocate data frmr err=%ld\n", 570 PTR_ERR(fr_desc->data_mr)); 571 ret = PTR_ERR(fr_desc->data_mr); 572 goto err_data_frpl; 573 } 574 fr_desc->ind |= ISERT_DATA_KEY_VALID; 575 576 isert_dbg("Created fr_desc %p\n", fr_desc); 577 578 return 0; 579 580 err_data_frpl: 581 ib_free_fast_reg_page_list(fr_desc->data_frpl); 582 583 return ret; 584 } 585 586 static int 587 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn) 588 { 589 struct fast_reg_descriptor *fr_desc; 590 struct isert_device *device = isert_conn->device; 591 struct se_session *se_sess = isert_conn->conn->sess->se_sess; 592 struct se_node_acl *se_nacl = se_sess->se_node_acl; 593 int i, ret, tag_num; 594 /* 595 * Setup the number of FRMRs based upon the number of tags 596 * available to session in iscsi_target_locate_portal(). 597 */ 598 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth); 599 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 600 601 isert_conn->fr_pool_size = 0; 602 for (i = 0; i < tag_num; i++) { 603 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL); 604 if (!fr_desc) { 605 isert_err("Failed to allocate fast_reg descriptor\n"); 606 ret = -ENOMEM; 607 goto err; 608 } 609 610 ret = isert_create_fr_desc(device->ib_device, 611 device->pd, fr_desc); 612 if (ret) { 613 isert_err("Failed to create fastreg descriptor err=%d\n", 614 ret); 615 kfree(fr_desc); 616 goto err; 617 } 618 619 list_add_tail(&fr_desc->list, &isert_conn->fr_pool); 620 isert_conn->fr_pool_size++; 621 } 622 623 isert_dbg("Creating conn %p fastreg pool size=%d", 624 isert_conn, isert_conn->fr_pool_size); 625 626 return 0; 627 628 err: 629 isert_conn_free_fastreg_pool(isert_conn); 630 return ret; 631 } 632 633 static void 634 isert_init_conn(struct isert_conn *isert_conn) 635 { 636 isert_conn->state = ISER_CONN_INIT; 637 INIT_LIST_HEAD(&isert_conn->accept_node); 638 init_completion(&isert_conn->login_comp); 639 init_completion(&isert_conn->login_req_comp); 640 init_completion(&isert_conn->wait); 641 kref_init(&isert_conn->kref); 642 mutex_init(&isert_conn->mutex); 643 spin_lock_init(&isert_conn->pool_lock); 644 INIT_LIST_HEAD(&isert_conn->fr_pool); 645 INIT_WORK(&isert_conn->release_work, isert_release_work); 646 } 647 648 static void 649 isert_free_login_buf(struct isert_conn *isert_conn) 650 { 651 struct ib_device *ib_dev = isert_conn->device->ib_device; 652 653 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, 654 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); 655 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 656 ISCSI_DEF_MAX_RECV_SEG_LEN, 657 DMA_FROM_DEVICE); 658 kfree(isert_conn->login_buf); 659 } 660 661 static int 662 isert_alloc_login_buf(struct isert_conn *isert_conn, 663 struct ib_device *ib_dev) 664 { 665 int ret; 666 667 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 668 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 669 if (!isert_conn->login_buf) { 670 isert_err("Unable to allocate isert_conn->login_buf\n"); 671 return -ENOMEM; 672 } 673 674 isert_conn->login_req_buf = isert_conn->login_buf; 675 isert_conn->login_rsp_buf = isert_conn->login_buf + 676 ISCSI_DEF_MAX_RECV_SEG_LEN; 677 678 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n", 679 isert_conn->login_buf, isert_conn->login_req_buf, 680 isert_conn->login_rsp_buf); 681 682 isert_conn->login_req_dma = ib_dma_map_single(ib_dev, 683 (void *)isert_conn->login_req_buf, 684 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); 685 686 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); 687 if (ret) { 688 isert_err("login_req_dma mapping error: %d\n", ret); 689 isert_conn->login_req_dma = 0; 690 goto out_login_buf; 691 } 692 693 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, 694 (void *)isert_conn->login_rsp_buf, 695 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); 696 697 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); 698 if (ret) { 699 isert_err("login_rsp_dma mapping error: %d\n", ret); 700 isert_conn->login_rsp_dma = 0; 701 goto out_req_dma_map; 702 } 703 704 return 0; 705 706 out_req_dma_map: 707 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 708 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); 709 out_login_buf: 710 kfree(isert_conn->login_buf); 711 return ret; 712 } 713 714 static int 715 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 716 { 717 struct isert_np *isert_np = cma_id->context; 718 struct iscsi_np *np = isert_np->np; 719 struct isert_conn *isert_conn; 720 struct isert_device *device; 721 int ret = 0; 722 723 spin_lock_bh(&np->np_thread_lock); 724 if (!np->enabled) { 725 spin_unlock_bh(&np->np_thread_lock); 726 isert_dbg("iscsi_np is not enabled, reject connect request\n"); 727 return rdma_reject(cma_id, NULL, 0); 728 } 729 spin_unlock_bh(&np->np_thread_lock); 730 731 isert_dbg("cma_id: %p, portal: %p\n", 732 cma_id, cma_id->context); 733 734 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); 735 if (!isert_conn) 736 return -ENOMEM; 737 738 isert_init_conn(isert_conn); 739 isert_conn->cm_id = cma_id; 740 741 ret = isert_alloc_login_buf(isert_conn, cma_id->device); 742 if (ret) 743 goto out; 744 745 device = isert_device_get(cma_id); 746 if (IS_ERR(device)) { 747 ret = PTR_ERR(device); 748 goto out_rsp_dma_map; 749 } 750 isert_conn->device = device; 751 752 /* Set max inflight RDMA READ requests */ 753 isert_conn->initiator_depth = min_t(u8, 754 event->param.conn.initiator_depth, 755 device->dev_attr.max_qp_init_rd_atom); 756 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); 757 758 ret = isert_conn_setup_qp(isert_conn, cma_id); 759 if (ret) 760 goto out_conn_dev; 761 762 ret = isert_rdma_post_recvl(isert_conn); 763 if (ret) 764 goto out_conn_dev; 765 /* 766 * Obtain the second reference now before isert_rdma_accept() to 767 * ensure that any initiator generated REJECT CM event that occurs 768 * asynchronously won't drop the last reference until the error path 769 * in iscsi_target_login_sess_out() does it's ->iscsit_free_conn() -> 770 * isert_free_conn() -> isert_put_conn() -> kref_put(). 771 */ 772 if (!kref_get_unless_zero(&isert_conn->kref)) { 773 isert_warn("conn %p connect_release is running\n", isert_conn); 774 goto out_conn_dev; 775 } 776 777 ret = isert_rdma_accept(isert_conn); 778 if (ret) 779 goto out_conn_dev; 780 781 mutex_lock(&isert_np->np_accept_mutex); 782 list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list); 783 mutex_unlock(&isert_np->np_accept_mutex); 784 785 isert_info("np %p: Allow accept_np to continue\n", np); 786 up(&isert_np->np_sem); 787 return 0; 788 789 out_conn_dev: 790 isert_device_put(device); 791 out_rsp_dma_map: 792 isert_free_login_buf(isert_conn); 793 out: 794 kfree(isert_conn); 795 rdma_reject(cma_id, NULL, 0); 796 return ret; 797 } 798 799 static void 800 isert_connect_release(struct isert_conn *isert_conn) 801 { 802 struct isert_device *device = isert_conn->device; 803 804 isert_dbg("conn %p\n", isert_conn); 805 806 BUG_ON(!device); 807 808 if (device->use_fastreg) 809 isert_conn_free_fastreg_pool(isert_conn); 810 811 isert_free_rx_descriptors(isert_conn); 812 if (isert_conn->cm_id) 813 rdma_destroy_id(isert_conn->cm_id); 814 815 if (isert_conn->qp) { 816 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; 817 818 isert_comp_put(comp); 819 ib_destroy_qp(isert_conn->qp); 820 } 821 822 if (isert_conn->login_buf) 823 isert_free_login_buf(isert_conn); 824 825 isert_device_put(device); 826 827 kfree(isert_conn); 828 } 829 830 static void 831 isert_connected_handler(struct rdma_cm_id *cma_id) 832 { 833 struct isert_conn *isert_conn = cma_id->qp->qp_context; 834 835 isert_info("conn %p\n", isert_conn); 836 837 mutex_lock(&isert_conn->mutex); 838 if (isert_conn->state != ISER_CONN_FULL_FEATURE) 839 isert_conn->state = ISER_CONN_UP; 840 mutex_unlock(&isert_conn->mutex); 841 } 842 843 static void 844 isert_release_kref(struct kref *kref) 845 { 846 struct isert_conn *isert_conn = container_of(kref, 847 struct isert_conn, kref); 848 849 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, 850 current->pid); 851 852 isert_connect_release(isert_conn); 853 } 854 855 static void 856 isert_put_conn(struct isert_conn *isert_conn) 857 { 858 kref_put(&isert_conn->kref, isert_release_kref); 859 } 860 861 /** 862 * isert_conn_terminate() - Initiate connection termination 863 * @isert_conn: isert connection struct 864 * 865 * Notes: 866 * In case the connection state is FULL_FEATURE, move state 867 * to TEMINATING and start teardown sequence (rdma_disconnect). 868 * In case the connection state is UP, complete flush as well. 869 * 870 * This routine must be called with mutex held. Thus it is 871 * safe to call multiple times. 872 */ 873 static void 874 isert_conn_terminate(struct isert_conn *isert_conn) 875 { 876 int err; 877 878 switch (isert_conn->state) { 879 case ISER_CONN_TERMINATING: 880 break; 881 case ISER_CONN_UP: 882 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ 883 isert_info("Terminating conn %p state %d\n", 884 isert_conn, isert_conn->state); 885 isert_conn->state = ISER_CONN_TERMINATING; 886 err = rdma_disconnect(isert_conn->cm_id); 887 if (err) 888 isert_warn("Failed rdma_disconnect isert_conn %p\n", 889 isert_conn); 890 break; 891 default: 892 isert_warn("conn %p teminating in state %d\n", 893 isert_conn, isert_conn->state); 894 } 895 } 896 897 static int 898 isert_np_cma_handler(struct isert_np *isert_np, 899 enum rdma_cm_event_type event) 900 { 901 isert_dbg("%s (%d): isert np %p\n", 902 rdma_event_msg(event), event, isert_np); 903 904 switch (event) { 905 case RDMA_CM_EVENT_DEVICE_REMOVAL: 906 isert_np->np_cm_id = NULL; 907 break; 908 case RDMA_CM_EVENT_ADDR_CHANGE: 909 isert_np->np_cm_id = isert_setup_id(isert_np); 910 if (IS_ERR(isert_np->np_cm_id)) { 911 isert_err("isert np %p setup id failed: %ld\n", 912 isert_np, PTR_ERR(isert_np->np_cm_id)); 913 isert_np->np_cm_id = NULL; 914 } 915 break; 916 default: 917 isert_err("isert np %p Unexpected event %d\n", 918 isert_np, event); 919 } 920 921 return -1; 922 } 923 924 static int 925 isert_disconnected_handler(struct rdma_cm_id *cma_id, 926 enum rdma_cm_event_type event) 927 { 928 struct isert_np *isert_np = cma_id->context; 929 struct isert_conn *isert_conn; 930 bool terminating = false; 931 932 if (isert_np->np_cm_id == cma_id) 933 return isert_np_cma_handler(cma_id->context, event); 934 935 isert_conn = cma_id->qp->qp_context; 936 937 mutex_lock(&isert_conn->mutex); 938 terminating = (isert_conn->state == ISER_CONN_TERMINATING); 939 isert_conn_terminate(isert_conn); 940 mutex_unlock(&isert_conn->mutex); 941 942 isert_info("conn %p completing wait\n", isert_conn); 943 complete(&isert_conn->wait); 944 945 if (terminating) 946 goto out; 947 948 mutex_lock(&isert_np->np_accept_mutex); 949 if (!list_empty(&isert_conn->accept_node)) { 950 list_del_init(&isert_conn->accept_node); 951 isert_put_conn(isert_conn); 952 queue_work(isert_release_wq, &isert_conn->release_work); 953 } 954 mutex_unlock(&isert_np->np_accept_mutex); 955 956 out: 957 return 0; 958 } 959 960 static int 961 isert_connect_error(struct rdma_cm_id *cma_id) 962 { 963 struct isert_conn *isert_conn = cma_id->qp->qp_context; 964 965 isert_conn->cm_id = NULL; 966 isert_put_conn(isert_conn); 967 968 return -1; 969 } 970 971 static int 972 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 973 { 974 int ret = 0; 975 976 isert_info("%s (%d): status %d id %p np %p\n", 977 rdma_event_msg(event->event), event->event, 978 event->status, cma_id, cma_id->context); 979 980 switch (event->event) { 981 case RDMA_CM_EVENT_CONNECT_REQUEST: 982 ret = isert_connect_request(cma_id, event); 983 if (ret) 984 isert_err("failed handle connect request %d\n", ret); 985 break; 986 case RDMA_CM_EVENT_ESTABLISHED: 987 isert_connected_handler(cma_id); 988 break; 989 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ 990 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ 991 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */ 992 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ 993 ret = isert_disconnected_handler(cma_id, event->event); 994 break; 995 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ 996 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ 997 case RDMA_CM_EVENT_CONNECT_ERROR: 998 ret = isert_connect_error(cma_id); 999 break; 1000 default: 1001 isert_err("Unhandled RDMA CMA event: %d\n", event->event); 1002 break; 1003 } 1004 1005 return ret; 1006 } 1007 1008 static int 1009 isert_post_recv(struct isert_conn *isert_conn, u32 count) 1010 { 1011 struct ib_recv_wr *rx_wr, *rx_wr_failed; 1012 int i, ret; 1013 unsigned int rx_head = isert_conn->rx_desc_head; 1014 struct iser_rx_desc *rx_desc; 1015 1016 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 1017 rx_desc = &isert_conn->rx_descs[rx_head]; 1018 rx_wr->wr_id = (uintptr_t)rx_desc; 1019 rx_wr->sg_list = &rx_desc->rx_sg; 1020 rx_wr->num_sge = 1; 1021 rx_wr->next = rx_wr + 1; 1022 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1); 1023 } 1024 1025 rx_wr--; 1026 rx_wr->next = NULL; /* mark end of work requests list */ 1027 1028 isert_conn->post_recv_buf_count += count; 1029 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, 1030 &rx_wr_failed); 1031 if (ret) { 1032 isert_err("ib_post_recv() failed with ret: %d\n", ret); 1033 isert_conn->post_recv_buf_count -= count; 1034 } else { 1035 isert_dbg("Posted %d RX buffers\n", count); 1036 isert_conn->rx_desc_head = rx_head; 1037 } 1038 return ret; 1039 } 1040 1041 static int 1042 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) 1043 { 1044 struct ib_device *ib_dev = isert_conn->cm_id->device; 1045 struct ib_send_wr send_wr, *send_wr_failed; 1046 int ret; 1047 1048 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, 1049 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1050 1051 send_wr.next = NULL; 1052 send_wr.wr_id = (uintptr_t)tx_desc; 1053 send_wr.sg_list = tx_desc->tx_sg; 1054 send_wr.num_sge = tx_desc->num_sge; 1055 send_wr.opcode = IB_WR_SEND; 1056 send_wr.send_flags = IB_SEND_SIGNALED; 1057 1058 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed); 1059 if (ret) 1060 isert_err("ib_post_send() failed, ret: %d\n", ret); 1061 1062 return ret; 1063 } 1064 1065 static void 1066 isert_create_send_desc(struct isert_conn *isert_conn, 1067 struct isert_cmd *isert_cmd, 1068 struct iser_tx_desc *tx_desc) 1069 { 1070 struct isert_device *device = isert_conn->device; 1071 struct ib_device *ib_dev = device->ib_device; 1072 1073 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, 1074 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1075 1076 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 1077 tx_desc->iser_header.flags = ISER_VER; 1078 1079 tx_desc->num_sge = 1; 1080 tx_desc->isert_cmd = isert_cmd; 1081 1082 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) { 1083 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 1084 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); 1085 } 1086 } 1087 1088 static int 1089 isert_init_tx_hdrs(struct isert_conn *isert_conn, 1090 struct iser_tx_desc *tx_desc) 1091 { 1092 struct isert_device *device = isert_conn->device; 1093 struct ib_device *ib_dev = device->ib_device; 1094 u64 dma_addr; 1095 1096 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, 1097 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1098 if (ib_dma_mapping_error(ib_dev, dma_addr)) { 1099 isert_err("ib_dma_mapping_error() failed\n"); 1100 return -ENOMEM; 1101 } 1102 1103 tx_desc->dma_addr = dma_addr; 1104 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 1105 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 1106 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; 1107 1108 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", 1109 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, 1110 tx_desc->tx_sg[0].lkey); 1111 1112 return 0; 1113 } 1114 1115 static void 1116 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1117 struct ib_send_wr *send_wr) 1118 { 1119 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; 1120 1121 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND; 1122 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 1123 send_wr->opcode = IB_WR_SEND; 1124 send_wr->sg_list = &tx_desc->tx_sg[0]; 1125 send_wr->num_sge = isert_cmd->tx_desc.num_sge; 1126 send_wr->send_flags = IB_SEND_SIGNALED; 1127 } 1128 1129 static int 1130 isert_rdma_post_recvl(struct isert_conn *isert_conn) 1131 { 1132 struct ib_recv_wr rx_wr, *rx_wr_fail; 1133 struct ib_sge sge; 1134 int ret; 1135 1136 memset(&sge, 0, sizeof(struct ib_sge)); 1137 sge.addr = isert_conn->login_req_dma; 1138 sge.length = ISER_RX_LOGIN_SIZE; 1139 sge.lkey = isert_conn->device->pd->local_dma_lkey; 1140 1141 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", 1142 sge.addr, sge.length, sge.lkey); 1143 1144 memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); 1145 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf; 1146 rx_wr.sg_list = &sge; 1147 rx_wr.num_sge = 1; 1148 1149 isert_conn->post_recv_buf_count++; 1150 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail); 1151 if (ret) { 1152 isert_err("ib_post_recv() failed: %d\n", ret); 1153 isert_conn->post_recv_buf_count--; 1154 } 1155 1156 return ret; 1157 } 1158 1159 static int 1160 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 1161 u32 length) 1162 { 1163 struct isert_conn *isert_conn = conn->context; 1164 struct isert_device *device = isert_conn->device; 1165 struct ib_device *ib_dev = device->ib_device; 1166 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; 1167 int ret; 1168 1169 isert_create_send_desc(isert_conn, NULL, tx_desc); 1170 1171 memcpy(&tx_desc->iscsi_header, &login->rsp[0], 1172 sizeof(struct iscsi_hdr)); 1173 1174 isert_init_tx_hdrs(isert_conn, tx_desc); 1175 1176 if (length > 0) { 1177 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; 1178 1179 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, 1180 length, DMA_TO_DEVICE); 1181 1182 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); 1183 1184 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, 1185 length, DMA_TO_DEVICE); 1186 1187 tx_dsg->addr = isert_conn->login_rsp_dma; 1188 tx_dsg->length = length; 1189 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey; 1190 tx_desc->num_sge = 2; 1191 } 1192 if (!login->login_failed) { 1193 if (login->login_complete) { 1194 if (!conn->sess->sess_ops->SessionType && 1195 isert_conn->device->use_fastreg) { 1196 ret = isert_conn_create_fastreg_pool(isert_conn); 1197 if (ret) { 1198 isert_err("Conn: %p failed to create" 1199 " fastreg pool\n", isert_conn); 1200 return ret; 1201 } 1202 } 1203 1204 ret = isert_alloc_rx_descriptors(isert_conn); 1205 if (ret) 1206 return ret; 1207 1208 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX); 1209 if (ret) 1210 return ret; 1211 1212 /* Now we are in FULL_FEATURE phase */ 1213 mutex_lock(&isert_conn->mutex); 1214 isert_conn->state = ISER_CONN_FULL_FEATURE; 1215 mutex_unlock(&isert_conn->mutex); 1216 goto post_send; 1217 } 1218 1219 ret = isert_rdma_post_recvl(isert_conn); 1220 if (ret) 1221 return ret; 1222 } 1223 post_send: 1224 ret = isert_post_send(isert_conn, tx_desc); 1225 if (ret) 1226 return ret; 1227 1228 return 0; 1229 } 1230 1231 static void 1232 isert_rx_login_req(struct isert_conn *isert_conn) 1233 { 1234 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf; 1235 int rx_buflen = isert_conn->login_req_len; 1236 struct iscsi_conn *conn = isert_conn->conn; 1237 struct iscsi_login *login = conn->conn_login; 1238 int size; 1239 1240 isert_info("conn %p\n", isert_conn); 1241 1242 WARN_ON_ONCE(!login); 1243 1244 if (login->first_request) { 1245 struct iscsi_login_req *login_req = 1246 (struct iscsi_login_req *)&rx_desc->iscsi_header; 1247 /* 1248 * Setup the initial iscsi_login values from the leading 1249 * login request PDU. 1250 */ 1251 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1252 login->current_stage = 1253 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 1254 >> 2; 1255 login->version_min = login_req->min_version; 1256 login->version_max = login_req->max_version; 1257 memcpy(login->isid, login_req->isid, 6); 1258 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1259 login->init_task_tag = login_req->itt; 1260 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1261 login->cid = be16_to_cpu(login_req->cid); 1262 login->tsih = be16_to_cpu(login_req->tsih); 1263 } 1264 1265 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); 1266 1267 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); 1268 isert_dbg("Using login payload size: %d, rx_buflen: %d " 1269 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, 1270 MAX_KEY_VALUE_PAIRS); 1271 memcpy(login->req_buf, &rx_desc->data[0], size); 1272 1273 if (login->first_request) { 1274 complete(&isert_conn->login_comp); 1275 return; 1276 } 1277 schedule_delayed_work(&conn->login_work, 0); 1278 } 1279 1280 static struct iscsi_cmd 1281 *isert_allocate_cmd(struct iscsi_conn *conn) 1282 { 1283 struct isert_conn *isert_conn = conn->context; 1284 struct isert_cmd *isert_cmd; 1285 struct iscsi_cmd *cmd; 1286 1287 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 1288 if (!cmd) { 1289 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n"); 1290 return NULL; 1291 } 1292 isert_cmd = iscsit_priv_cmd(cmd); 1293 isert_cmd->conn = isert_conn; 1294 isert_cmd->iscsi_cmd = cmd; 1295 1296 return cmd; 1297 } 1298 1299 static int 1300 isert_handle_scsi_cmd(struct isert_conn *isert_conn, 1301 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, 1302 struct iser_rx_desc *rx_desc, unsigned char *buf) 1303 { 1304 struct iscsi_conn *conn = isert_conn->conn; 1305 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1306 struct scatterlist *sg; 1307 int imm_data, imm_data_len, unsol_data, sg_nents, rc; 1308 bool dump_payload = false; 1309 1310 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1311 if (rc < 0) 1312 return rc; 1313 1314 imm_data = cmd->immediate_data; 1315 imm_data_len = cmd->first_burst_len; 1316 unsol_data = cmd->unsolicited_data; 1317 1318 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1319 if (rc < 0) { 1320 return 0; 1321 } else if (rc > 0) { 1322 dump_payload = true; 1323 goto sequence_cmd; 1324 } 1325 1326 if (!imm_data) 1327 return 0; 1328 1329 sg = &cmd->se_cmd.t_data_sg[0]; 1330 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); 1331 1332 isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n", 1333 sg, sg_nents, &rx_desc->data[0], imm_data_len); 1334 1335 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len); 1336 1337 cmd->write_data_done += imm_data_len; 1338 1339 if (cmd->write_data_done == cmd->se_cmd.data_length) { 1340 spin_lock_bh(&cmd->istate_lock); 1341 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1342 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1343 spin_unlock_bh(&cmd->istate_lock); 1344 } 1345 1346 sequence_cmd: 1347 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1348 1349 if (!rc && dump_payload == false && unsol_data) 1350 iscsit_set_unsoliticed_dataout(cmd); 1351 else if (dump_payload && imm_data) 1352 target_put_sess_cmd(&cmd->se_cmd); 1353 1354 return 0; 1355 } 1356 1357 static int 1358 isert_handle_iscsi_dataout(struct isert_conn *isert_conn, 1359 struct iser_rx_desc *rx_desc, unsigned char *buf) 1360 { 1361 struct scatterlist *sg_start; 1362 struct iscsi_conn *conn = isert_conn->conn; 1363 struct iscsi_cmd *cmd = NULL; 1364 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1365 u32 unsol_data_len = ntoh24(hdr->dlength); 1366 int rc, sg_nents, sg_off, page_off; 1367 1368 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1369 if (rc < 0) 1370 return rc; 1371 else if (!cmd) 1372 return 0; 1373 /* 1374 * FIXME: Unexpected unsolicited_data out 1375 */ 1376 if (!cmd->unsolicited_data) { 1377 isert_err("Received unexpected solicited data payload\n"); 1378 dump_stack(); 1379 return -1; 1380 } 1381 1382 isert_dbg("Unsolicited DataOut unsol_data_len: %u, " 1383 "write_data_done: %u, data_length: %u\n", 1384 unsol_data_len, cmd->write_data_done, 1385 cmd->se_cmd.data_length); 1386 1387 sg_off = cmd->write_data_done / PAGE_SIZE; 1388 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 1389 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); 1390 page_off = cmd->write_data_done % PAGE_SIZE; 1391 /* 1392 * FIXME: Non page-aligned unsolicited_data out 1393 */ 1394 if (page_off) { 1395 isert_err("unexpected non-page aligned data payload\n"); 1396 dump_stack(); 1397 return -1; 1398 } 1399 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " 1400 "sg_nents: %u from %p %u\n", sg_start, sg_off, 1401 sg_nents, &rx_desc->data[0], unsol_data_len); 1402 1403 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], 1404 unsol_data_len); 1405 1406 rc = iscsit_check_dataout_payload(cmd, hdr, false); 1407 if (rc < 0) 1408 return rc; 1409 1410 return 0; 1411 } 1412 1413 static int 1414 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1415 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1416 unsigned char *buf) 1417 { 1418 struct iscsi_conn *conn = isert_conn->conn; 1419 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1420 int rc; 1421 1422 rc = iscsit_setup_nop_out(conn, cmd, hdr); 1423 if (rc < 0) 1424 return rc; 1425 /* 1426 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload 1427 */ 1428 1429 return iscsit_process_nop_out(conn, cmd, hdr); 1430 } 1431 1432 static int 1433 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1434 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1435 struct iscsi_text *hdr) 1436 { 1437 struct iscsi_conn *conn = isert_conn->conn; 1438 u32 payload_length = ntoh24(hdr->dlength); 1439 int rc; 1440 unsigned char *text_in = NULL; 1441 1442 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 1443 if (rc < 0) 1444 return rc; 1445 1446 if (payload_length) { 1447 text_in = kzalloc(payload_length, GFP_KERNEL); 1448 if (!text_in) { 1449 isert_err("Unable to allocate text_in of payload_length: %u\n", 1450 payload_length); 1451 return -ENOMEM; 1452 } 1453 } 1454 cmd->text_in_ptr = text_in; 1455 1456 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); 1457 1458 return iscsit_process_text_cmd(conn, cmd, hdr); 1459 } 1460 1461 static int 1462 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, 1463 uint32_t read_stag, uint64_t read_va, 1464 uint32_t write_stag, uint64_t write_va) 1465 { 1466 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1467 struct iscsi_conn *conn = isert_conn->conn; 1468 struct iscsi_cmd *cmd; 1469 struct isert_cmd *isert_cmd; 1470 int ret = -EINVAL; 1471 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); 1472 1473 if (conn->sess->sess_ops->SessionType && 1474 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { 1475 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," 1476 " ignoring\n", opcode); 1477 return 0; 1478 } 1479 1480 switch (opcode) { 1481 case ISCSI_OP_SCSI_CMD: 1482 cmd = isert_allocate_cmd(conn); 1483 if (!cmd) 1484 break; 1485 1486 isert_cmd = iscsit_priv_cmd(cmd); 1487 isert_cmd->read_stag = read_stag; 1488 isert_cmd->read_va = read_va; 1489 isert_cmd->write_stag = write_stag; 1490 isert_cmd->write_va = write_va; 1491 1492 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, 1493 rx_desc, (unsigned char *)hdr); 1494 break; 1495 case ISCSI_OP_NOOP_OUT: 1496 cmd = isert_allocate_cmd(conn); 1497 if (!cmd) 1498 break; 1499 1500 isert_cmd = iscsit_priv_cmd(cmd); 1501 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, 1502 rx_desc, (unsigned char *)hdr); 1503 break; 1504 case ISCSI_OP_SCSI_DATA_OUT: 1505 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, 1506 (unsigned char *)hdr); 1507 break; 1508 case ISCSI_OP_SCSI_TMFUNC: 1509 cmd = isert_allocate_cmd(conn); 1510 if (!cmd) 1511 break; 1512 1513 ret = iscsit_handle_task_mgt_cmd(conn, cmd, 1514 (unsigned char *)hdr); 1515 break; 1516 case ISCSI_OP_LOGOUT: 1517 cmd = isert_allocate_cmd(conn); 1518 if (!cmd) 1519 break; 1520 1521 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); 1522 break; 1523 case ISCSI_OP_TEXT: 1524 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) { 1525 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 1526 if (!cmd) 1527 break; 1528 } else { 1529 cmd = isert_allocate_cmd(conn); 1530 if (!cmd) 1531 break; 1532 } 1533 1534 isert_cmd = iscsit_priv_cmd(cmd); 1535 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, 1536 rx_desc, (struct iscsi_text *)hdr); 1537 break; 1538 default: 1539 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); 1540 dump_stack(); 1541 break; 1542 } 1543 1544 return ret; 1545 } 1546 1547 static void 1548 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn) 1549 { 1550 struct iser_hdr *iser_hdr = &rx_desc->iser_header; 1551 uint64_t read_va = 0, write_va = 0; 1552 uint32_t read_stag = 0, write_stag = 0; 1553 int rc; 1554 1555 switch (iser_hdr->flags & 0xF0) { 1556 case ISCSI_CTRL: 1557 if (iser_hdr->flags & ISER_RSV) { 1558 read_stag = be32_to_cpu(iser_hdr->read_stag); 1559 read_va = be64_to_cpu(iser_hdr->read_va); 1560 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", 1561 read_stag, (unsigned long long)read_va); 1562 } 1563 if (iser_hdr->flags & ISER_WSV) { 1564 write_stag = be32_to_cpu(iser_hdr->write_stag); 1565 write_va = be64_to_cpu(iser_hdr->write_va); 1566 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", 1567 write_stag, (unsigned long long)write_va); 1568 } 1569 1570 isert_dbg("ISER ISCSI_CTRL PDU\n"); 1571 break; 1572 case ISER_HELLO: 1573 isert_err("iSER Hello message\n"); 1574 break; 1575 default: 1576 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags); 1577 break; 1578 } 1579 1580 rc = isert_rx_opcode(isert_conn, rx_desc, 1581 read_stag, read_va, write_stag, write_va); 1582 } 1583 1584 static void 1585 isert_rcv_completion(struct iser_rx_desc *desc, 1586 struct isert_conn *isert_conn, 1587 u32 xfer_len) 1588 { 1589 struct ib_device *ib_dev = isert_conn->cm_id->device; 1590 struct iscsi_hdr *hdr; 1591 u64 rx_dma; 1592 int rx_buflen, outstanding; 1593 1594 if ((char *)desc == isert_conn->login_req_buf) { 1595 rx_dma = isert_conn->login_req_dma; 1596 rx_buflen = ISER_RX_LOGIN_SIZE; 1597 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", 1598 rx_dma, rx_buflen); 1599 } else { 1600 rx_dma = desc->dma_addr; 1601 rx_buflen = ISER_RX_PAYLOAD_SIZE; 1602 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", 1603 rx_dma, rx_buflen); 1604 } 1605 1606 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); 1607 1608 hdr = &desc->iscsi_header; 1609 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", 1610 hdr->opcode, hdr->itt, hdr->flags, 1611 (int)(xfer_len - ISER_HEADERS_LEN)); 1612 1613 if ((char *)desc == isert_conn->login_req_buf) { 1614 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN; 1615 if (isert_conn->conn) { 1616 struct iscsi_login *login = isert_conn->conn->conn_login; 1617 1618 if (login && !login->first_request) 1619 isert_rx_login_req(isert_conn); 1620 } 1621 mutex_lock(&isert_conn->mutex); 1622 complete(&isert_conn->login_req_comp); 1623 mutex_unlock(&isert_conn->mutex); 1624 } else { 1625 isert_rx_do_work(desc, isert_conn); 1626 } 1627 1628 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen, 1629 DMA_FROM_DEVICE); 1630 1631 isert_conn->post_recv_buf_count--; 1632 isert_dbg("Decremented post_recv_buf_count: %d\n", 1633 isert_conn->post_recv_buf_count); 1634 1635 if ((char *)desc == isert_conn->login_req_buf) 1636 return; 1637 1638 outstanding = isert_conn->post_recv_buf_count; 1639 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) { 1640 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding, 1641 ISERT_MIN_POSTED_RX); 1642 err = isert_post_recv(isert_conn, count); 1643 if (err) { 1644 isert_err("isert_post_recv() count: %d failed, %d\n", 1645 count, err); 1646 } 1647 } 1648 } 1649 1650 static int 1651 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1652 struct scatterlist *sg, u32 nents, u32 length, u32 offset, 1653 enum iser_ib_op_code op, struct isert_data_buf *data) 1654 { 1655 struct ib_device *ib_dev = isert_conn->cm_id->device; 1656 1657 data->dma_dir = op == ISER_IB_RDMA_WRITE ? 1658 DMA_TO_DEVICE : DMA_FROM_DEVICE; 1659 1660 data->len = length - offset; 1661 data->offset = offset; 1662 data->sg_off = data->offset / PAGE_SIZE; 1663 1664 data->sg = &sg[data->sg_off]; 1665 data->nents = min_t(unsigned int, nents - data->sg_off, 1666 ISCSI_ISER_SG_TABLESIZE); 1667 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE * 1668 PAGE_SIZE); 1669 1670 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents, 1671 data->dma_dir); 1672 if (unlikely(!data->dma_nents)) { 1673 isert_err("Cmd: unable to dma map SGs %p\n", sg); 1674 return -EINVAL; 1675 } 1676 1677 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", 1678 isert_cmd, data->dma_nents, data->sg, data->nents, data->len); 1679 1680 return 0; 1681 } 1682 1683 static void 1684 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data) 1685 { 1686 struct ib_device *ib_dev = isert_conn->cm_id->device; 1687 1688 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir); 1689 memset(data, 0, sizeof(*data)); 1690 } 1691 1692 1693 1694 static void 1695 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) 1696 { 1697 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1698 1699 isert_dbg("Cmd %p\n", isert_cmd); 1700 1701 if (wr->data.sg) { 1702 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); 1703 isert_unmap_data_buf(isert_conn, &wr->data); 1704 } 1705 1706 if (wr->send_wr) { 1707 isert_dbg("Cmd %p free send_wr\n", isert_cmd); 1708 kfree(wr->send_wr); 1709 wr->send_wr = NULL; 1710 } 1711 1712 if (wr->ib_sge) { 1713 isert_dbg("Cmd %p free ib_sge\n", isert_cmd); 1714 kfree(wr->ib_sge); 1715 wr->ib_sge = NULL; 1716 } 1717 } 1718 1719 static void 1720 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) 1721 { 1722 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1723 1724 isert_dbg("Cmd %p\n", isert_cmd); 1725 1726 if (wr->fr_desc) { 1727 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc); 1728 if (wr->fr_desc->ind & ISERT_PROTECTED) { 1729 isert_unmap_data_buf(isert_conn, &wr->prot); 1730 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1731 } 1732 spin_lock_bh(&isert_conn->pool_lock); 1733 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool); 1734 spin_unlock_bh(&isert_conn->pool_lock); 1735 wr->fr_desc = NULL; 1736 } 1737 1738 if (wr->data.sg) { 1739 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); 1740 isert_unmap_data_buf(isert_conn, &wr->data); 1741 } 1742 1743 wr->ib_sge = NULL; 1744 wr->send_wr = NULL; 1745 } 1746 1747 static void 1748 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) 1749 { 1750 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1751 struct isert_conn *isert_conn = isert_cmd->conn; 1752 struct iscsi_conn *conn = isert_conn->conn; 1753 struct isert_device *device = isert_conn->device; 1754 struct iscsi_text_rsp *hdr; 1755 1756 isert_dbg("Cmd %p\n", isert_cmd); 1757 1758 switch (cmd->iscsi_opcode) { 1759 case ISCSI_OP_SCSI_CMD: 1760 spin_lock_bh(&conn->cmd_lock); 1761 if (!list_empty(&cmd->i_conn_node)) 1762 list_del_init(&cmd->i_conn_node); 1763 spin_unlock_bh(&conn->cmd_lock); 1764 1765 if (cmd->data_direction == DMA_TO_DEVICE) { 1766 iscsit_stop_dataout_timer(cmd); 1767 /* 1768 * Check for special case during comp_err where 1769 * WRITE_PENDING has been handed off from core, 1770 * but requires an extra target_put_sess_cmd() 1771 * before transport_generic_free_cmd() below. 1772 */ 1773 if (comp_err && 1774 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 1775 struct se_cmd *se_cmd = &cmd->se_cmd; 1776 1777 target_put_sess_cmd(se_cmd); 1778 } 1779 } 1780 1781 device->unreg_rdma_mem(isert_cmd, isert_conn); 1782 transport_generic_free_cmd(&cmd->se_cmd, 0); 1783 break; 1784 case ISCSI_OP_SCSI_TMFUNC: 1785 spin_lock_bh(&conn->cmd_lock); 1786 if (!list_empty(&cmd->i_conn_node)) 1787 list_del_init(&cmd->i_conn_node); 1788 spin_unlock_bh(&conn->cmd_lock); 1789 1790 transport_generic_free_cmd(&cmd->se_cmd, 0); 1791 break; 1792 case ISCSI_OP_REJECT: 1793 case ISCSI_OP_NOOP_OUT: 1794 case ISCSI_OP_TEXT: 1795 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 1796 /* If the continue bit is on, keep the command alive */ 1797 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) 1798 break; 1799 1800 spin_lock_bh(&conn->cmd_lock); 1801 if (!list_empty(&cmd->i_conn_node)) 1802 list_del_init(&cmd->i_conn_node); 1803 spin_unlock_bh(&conn->cmd_lock); 1804 1805 /* 1806 * Handle special case for REJECT when iscsi_add_reject*() has 1807 * overwritten the original iscsi_opcode assignment, and the 1808 * associated cmd->se_cmd needs to be released. 1809 */ 1810 if (cmd->se_cmd.se_tfo != NULL) { 1811 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", 1812 cmd->iscsi_opcode); 1813 transport_generic_free_cmd(&cmd->se_cmd, 0); 1814 break; 1815 } 1816 /* 1817 * Fall-through 1818 */ 1819 default: 1820 iscsit_release_cmd(cmd); 1821 break; 1822 } 1823 } 1824 1825 static void 1826 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) 1827 { 1828 if (tx_desc->dma_addr != 0) { 1829 isert_dbg("unmap single for tx_desc->dma_addr\n"); 1830 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, 1831 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1832 tx_desc->dma_addr = 0; 1833 } 1834 } 1835 1836 static void 1837 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, 1838 struct ib_device *ib_dev, bool comp_err) 1839 { 1840 if (isert_cmd->pdu_buf_dma != 0) { 1841 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n"); 1842 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, 1843 isert_cmd->pdu_buf_len, DMA_TO_DEVICE); 1844 isert_cmd->pdu_buf_dma = 0; 1845 } 1846 1847 isert_unmap_tx_desc(tx_desc, ib_dev); 1848 isert_put_cmd(isert_cmd, comp_err); 1849 } 1850 1851 static int 1852 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) 1853 { 1854 struct ib_mr_status mr_status; 1855 int ret; 1856 1857 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); 1858 if (ret) { 1859 isert_err("ib_check_mr_status failed, ret %d\n", ret); 1860 goto fail_mr_status; 1861 } 1862 1863 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1864 u64 sec_offset_err; 1865 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; 1866 1867 switch (mr_status.sig_err.err_type) { 1868 case IB_SIG_BAD_GUARD: 1869 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1870 break; 1871 case IB_SIG_BAD_REFTAG: 1872 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1873 break; 1874 case IB_SIG_BAD_APPTAG: 1875 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; 1876 break; 1877 } 1878 sec_offset_err = mr_status.sig_err.sig_err_offset; 1879 do_div(sec_offset_err, block_size); 1880 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; 1881 1882 isert_err("PI error found type %d at sector 0x%llx " 1883 "expected 0x%x vs actual 0x%x\n", 1884 mr_status.sig_err.err_type, 1885 (unsigned long long)se_cmd->bad_sector, 1886 mr_status.sig_err.expected, 1887 mr_status.sig_err.actual); 1888 ret = 1; 1889 } 1890 1891 fail_mr_status: 1892 return ret; 1893 } 1894 1895 static void 1896 isert_completion_rdma_write(struct iser_tx_desc *tx_desc, 1897 struct isert_cmd *isert_cmd) 1898 { 1899 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1900 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1901 struct se_cmd *se_cmd = &cmd->se_cmd; 1902 struct isert_conn *isert_conn = isert_cmd->conn; 1903 struct isert_device *device = isert_conn->device; 1904 int ret = 0; 1905 1906 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { 1907 ret = isert_check_pi_status(se_cmd, 1908 wr->fr_desc->pi_ctx->sig_mr); 1909 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1910 } 1911 1912 device->unreg_rdma_mem(isert_cmd, isert_conn); 1913 wr->send_wr_num = 0; 1914 if (ret) 1915 transport_send_check_condition_and_sense(se_cmd, 1916 se_cmd->pi_err, 0); 1917 else 1918 isert_put_response(isert_conn->conn, cmd); 1919 } 1920 1921 static void 1922 isert_completion_rdma_read(struct iser_tx_desc *tx_desc, 1923 struct isert_cmd *isert_cmd) 1924 { 1925 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1926 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1927 struct se_cmd *se_cmd = &cmd->se_cmd; 1928 struct isert_conn *isert_conn = isert_cmd->conn; 1929 struct isert_device *device = isert_conn->device; 1930 int ret = 0; 1931 1932 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { 1933 ret = isert_check_pi_status(se_cmd, 1934 wr->fr_desc->pi_ctx->sig_mr); 1935 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1936 } 1937 1938 iscsit_stop_dataout_timer(cmd); 1939 device->unreg_rdma_mem(isert_cmd, isert_conn); 1940 cmd->write_data_done = wr->data.len; 1941 wr->send_wr_num = 0; 1942 1943 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); 1944 spin_lock_bh(&cmd->istate_lock); 1945 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1946 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1947 spin_unlock_bh(&cmd->istate_lock); 1948 1949 if (ret) { 1950 target_put_sess_cmd(se_cmd); 1951 transport_send_check_condition_and_sense(se_cmd, 1952 se_cmd->pi_err, 0); 1953 } else { 1954 target_execute_cmd(se_cmd); 1955 } 1956 } 1957 1958 static void 1959 isert_do_control_comp(struct work_struct *work) 1960 { 1961 struct isert_cmd *isert_cmd = container_of(work, 1962 struct isert_cmd, comp_work); 1963 struct isert_conn *isert_conn = isert_cmd->conn; 1964 struct ib_device *ib_dev = isert_conn->cm_id->device; 1965 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1966 1967 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); 1968 1969 switch (cmd->i_state) { 1970 case ISTATE_SEND_TASKMGTRSP: 1971 iscsit_tmr_post_handler(cmd, cmd->conn); 1972 case ISTATE_SEND_REJECT: /* FALLTHRU */ 1973 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */ 1974 cmd->i_state = ISTATE_SENT_STATUS; 1975 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, 1976 ib_dev, false); 1977 break; 1978 case ISTATE_SEND_LOGOUTRSP: 1979 iscsit_logout_post_handler(cmd, cmd->conn); 1980 break; 1981 default: 1982 isert_err("Unknown i_state %d\n", cmd->i_state); 1983 dump_stack(); 1984 break; 1985 } 1986 } 1987 1988 static void 1989 isert_response_completion(struct iser_tx_desc *tx_desc, 1990 struct isert_cmd *isert_cmd, 1991 struct isert_conn *isert_conn, 1992 struct ib_device *ib_dev) 1993 { 1994 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1995 1996 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP || 1997 cmd->i_state == ISTATE_SEND_LOGOUTRSP || 1998 cmd->i_state == ISTATE_SEND_REJECT || 1999 cmd->i_state == ISTATE_SEND_TEXTRSP) { 2000 isert_unmap_tx_desc(tx_desc, ib_dev); 2001 2002 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); 2003 queue_work(isert_comp_wq, &isert_cmd->comp_work); 2004 return; 2005 } 2006 2007 cmd->i_state = ISTATE_SENT_STATUS; 2008 isert_completion_put(tx_desc, isert_cmd, ib_dev, false); 2009 } 2010 2011 static void 2012 isert_snd_completion(struct iser_tx_desc *tx_desc, 2013 struct isert_conn *isert_conn) 2014 { 2015 struct ib_device *ib_dev = isert_conn->cm_id->device; 2016 struct isert_cmd *isert_cmd = tx_desc->isert_cmd; 2017 struct isert_rdma_wr *wr; 2018 2019 if (!isert_cmd) { 2020 isert_unmap_tx_desc(tx_desc, ib_dev); 2021 return; 2022 } 2023 wr = &isert_cmd->rdma_wr; 2024 2025 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op); 2026 2027 switch (wr->iser_ib_op) { 2028 case ISER_IB_SEND: 2029 isert_response_completion(tx_desc, isert_cmd, 2030 isert_conn, ib_dev); 2031 break; 2032 case ISER_IB_RDMA_WRITE: 2033 isert_completion_rdma_write(tx_desc, isert_cmd); 2034 break; 2035 case ISER_IB_RDMA_READ: 2036 isert_completion_rdma_read(tx_desc, isert_cmd); 2037 break; 2038 default: 2039 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op); 2040 dump_stack(); 2041 break; 2042 } 2043 } 2044 2045 /** 2046 * is_isert_tx_desc() - Indicate if the completion wr_id 2047 * is a TX descriptor or not. 2048 * @isert_conn: iser connection 2049 * @wr_id: completion WR identifier 2050 * 2051 * Since we cannot rely on wc opcode in FLUSH errors 2052 * we must work around it by checking if the wr_id address 2053 * falls in the iser connection rx_descs buffer. If so 2054 * it is an RX descriptor, otherwize it is a TX. 2055 */ 2056 static inline bool 2057 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id) 2058 { 2059 void *start = isert_conn->rx_descs; 2060 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs); 2061 2062 if (wr_id >= start && wr_id < start + len) 2063 return false; 2064 2065 return true; 2066 } 2067 2068 static void 2069 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc) 2070 { 2071 if (wc->wr_id == ISER_BEACON_WRID) { 2072 isert_info("conn %p completing wait_comp_err\n", 2073 isert_conn); 2074 complete(&isert_conn->wait_comp_err); 2075 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) { 2076 struct ib_device *ib_dev = isert_conn->cm_id->device; 2077 struct isert_cmd *isert_cmd; 2078 struct iser_tx_desc *desc; 2079 2080 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; 2081 isert_cmd = desc->isert_cmd; 2082 if (!isert_cmd) 2083 isert_unmap_tx_desc(desc, ib_dev); 2084 else 2085 isert_completion_put(desc, isert_cmd, ib_dev, true); 2086 } else { 2087 isert_conn->post_recv_buf_count--; 2088 if (!isert_conn->post_recv_buf_count) 2089 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 2090 } 2091 } 2092 2093 static void 2094 isert_handle_wc(struct ib_wc *wc) 2095 { 2096 struct isert_conn *isert_conn; 2097 struct iser_tx_desc *tx_desc; 2098 struct iser_rx_desc *rx_desc; 2099 2100 isert_conn = wc->qp->qp_context; 2101 if (likely(wc->status == IB_WC_SUCCESS)) { 2102 if (wc->opcode == IB_WC_RECV) { 2103 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; 2104 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len); 2105 } else { 2106 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; 2107 isert_snd_completion(tx_desc, isert_conn); 2108 } 2109 } else { 2110 if (wc->status != IB_WC_WR_FLUSH_ERR) 2111 isert_err("%s (%d): wr id %llx vend_err %x\n", 2112 ib_wc_status_msg(wc->status), wc->status, 2113 wc->wr_id, wc->vendor_err); 2114 else 2115 isert_dbg("%s (%d): wr id %llx\n", 2116 ib_wc_status_msg(wc->status), wc->status, 2117 wc->wr_id); 2118 2119 if (wc->wr_id != ISER_FASTREG_LI_WRID) 2120 isert_cq_comp_err(isert_conn, wc); 2121 } 2122 } 2123 2124 static void 2125 isert_cq_work(struct work_struct *work) 2126 { 2127 enum { isert_poll_budget = 65536 }; 2128 struct isert_comp *comp = container_of(work, struct isert_comp, 2129 work); 2130 struct ib_wc *const wcs = comp->wcs; 2131 int i, n, completed = 0; 2132 2133 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { 2134 for (i = 0; i < n; i++) 2135 isert_handle_wc(&wcs[i]); 2136 2137 completed += n; 2138 if (completed >= isert_poll_budget) 2139 break; 2140 } 2141 2142 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); 2143 } 2144 2145 static void 2146 isert_cq_callback(struct ib_cq *cq, void *context) 2147 { 2148 struct isert_comp *comp = context; 2149 2150 queue_work(isert_comp_wq, &comp->work); 2151 } 2152 2153 static int 2154 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) 2155 { 2156 struct ib_send_wr *wr_failed; 2157 int ret; 2158 2159 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, 2160 &wr_failed); 2161 if (ret) { 2162 isert_err("ib_post_send failed with %d\n", ret); 2163 return ret; 2164 } 2165 return ret; 2166 } 2167 2168 static int 2169 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2170 { 2171 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2172 struct isert_conn *isert_conn = conn->context; 2173 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2174 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) 2175 &isert_cmd->tx_desc.iscsi_header; 2176 2177 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2178 iscsit_build_rsp_pdu(cmd, conn, true, hdr); 2179 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2180 /* 2181 * Attach SENSE DATA payload to iSCSI Response PDU 2182 */ 2183 if (cmd->se_cmd.sense_buffer && 2184 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 2185 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 2186 struct isert_device *device = isert_conn->device; 2187 struct ib_device *ib_dev = device->ib_device; 2188 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2189 u32 padding, pdu_len; 2190 2191 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, 2192 cmd->sense_buffer); 2193 cmd->se_cmd.scsi_sense_length += sizeof(__be16); 2194 2195 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 2196 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 2197 pdu_len = cmd->se_cmd.scsi_sense_length + padding; 2198 2199 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2200 (void *)cmd->sense_buffer, pdu_len, 2201 DMA_TO_DEVICE); 2202 2203 isert_cmd->pdu_buf_len = pdu_len; 2204 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2205 tx_dsg->length = pdu_len; 2206 tx_dsg->lkey = device->pd->local_dma_lkey; 2207 isert_cmd->tx_desc.num_sge = 2; 2208 } 2209 2210 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2211 2212 isert_dbg("Posting SCSI Response\n"); 2213 2214 return isert_post_response(isert_conn, isert_cmd); 2215 } 2216 2217 static void 2218 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2219 { 2220 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2221 struct isert_conn *isert_conn = conn->context; 2222 struct isert_device *device = isert_conn->device; 2223 2224 spin_lock_bh(&conn->cmd_lock); 2225 if (!list_empty(&cmd->i_conn_node)) 2226 list_del_init(&cmd->i_conn_node); 2227 spin_unlock_bh(&conn->cmd_lock); 2228 2229 if (cmd->data_direction == DMA_TO_DEVICE) 2230 iscsit_stop_dataout_timer(cmd); 2231 2232 device->unreg_rdma_mem(isert_cmd, isert_conn); 2233 } 2234 2235 static enum target_prot_op 2236 isert_get_sup_prot_ops(struct iscsi_conn *conn) 2237 { 2238 struct isert_conn *isert_conn = conn->context; 2239 struct isert_device *device = isert_conn->device; 2240 2241 if (conn->tpg->tpg_attrib.t10_pi) { 2242 if (device->pi_capable) { 2243 isert_info("conn %p PI offload enabled\n", isert_conn); 2244 isert_conn->pi_support = true; 2245 return TARGET_PROT_ALL; 2246 } 2247 } 2248 2249 isert_info("conn %p PI offload disabled\n", isert_conn); 2250 isert_conn->pi_support = false; 2251 2252 return TARGET_PROT_NORMAL; 2253 } 2254 2255 static int 2256 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2257 bool nopout_response) 2258 { 2259 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2260 struct isert_conn *isert_conn = conn->context; 2261 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2262 2263 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2264 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) 2265 &isert_cmd->tx_desc.iscsi_header, 2266 nopout_response); 2267 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2268 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2269 2270 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); 2271 2272 return isert_post_response(isert_conn, isert_cmd); 2273 } 2274 2275 static int 2276 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2277 { 2278 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2279 struct isert_conn *isert_conn = conn->context; 2280 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2281 2282 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2283 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) 2284 &isert_cmd->tx_desc.iscsi_header); 2285 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2286 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2287 2288 isert_dbg("conn %p Posting Logout Response\n", isert_conn); 2289 2290 return isert_post_response(isert_conn, isert_cmd); 2291 } 2292 2293 static int 2294 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2295 { 2296 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2297 struct isert_conn *isert_conn = conn->context; 2298 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2299 2300 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2301 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) 2302 &isert_cmd->tx_desc.iscsi_header); 2303 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2304 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2305 2306 isert_dbg("conn %p Posting Task Management Response\n", isert_conn); 2307 2308 return isert_post_response(isert_conn, isert_cmd); 2309 } 2310 2311 static int 2312 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2313 { 2314 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2315 struct isert_conn *isert_conn = conn->context; 2316 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2317 struct isert_device *device = isert_conn->device; 2318 struct ib_device *ib_dev = device->ib_device; 2319 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2320 struct iscsi_reject *hdr = 2321 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; 2322 2323 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2324 iscsit_build_reject(cmd, conn, hdr); 2325 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2326 2327 hton24(hdr->dlength, ISCSI_HDR_LEN); 2328 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2329 (void *)cmd->buf_ptr, ISCSI_HDR_LEN, 2330 DMA_TO_DEVICE); 2331 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; 2332 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2333 tx_dsg->length = ISCSI_HDR_LEN; 2334 tx_dsg->lkey = device->pd->local_dma_lkey; 2335 isert_cmd->tx_desc.num_sge = 2; 2336 2337 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2338 2339 isert_dbg("conn %p Posting Reject\n", isert_conn); 2340 2341 return isert_post_response(isert_conn, isert_cmd); 2342 } 2343 2344 static int 2345 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2346 { 2347 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2348 struct isert_conn *isert_conn = conn->context; 2349 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2350 struct iscsi_text_rsp *hdr = 2351 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 2352 u32 txt_rsp_len; 2353 int rc; 2354 2355 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2356 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); 2357 if (rc < 0) 2358 return rc; 2359 2360 txt_rsp_len = rc; 2361 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2362 2363 if (txt_rsp_len) { 2364 struct isert_device *device = isert_conn->device; 2365 struct ib_device *ib_dev = device->ib_device; 2366 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2367 void *txt_rsp_buf = cmd->buf_ptr; 2368 2369 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2370 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); 2371 2372 isert_cmd->pdu_buf_len = txt_rsp_len; 2373 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2374 tx_dsg->length = txt_rsp_len; 2375 tx_dsg->lkey = device->pd->local_dma_lkey; 2376 isert_cmd->tx_desc.num_sge = 2; 2377 } 2378 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2379 2380 isert_dbg("conn %p Text Response\n", isert_conn); 2381 2382 return isert_post_response(isert_conn, isert_cmd); 2383 } 2384 2385 static int 2386 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 2387 struct ib_sge *ib_sge, struct ib_send_wr *send_wr, 2388 u32 data_left, u32 offset) 2389 { 2390 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 2391 struct scatterlist *sg_start, *tmp_sg; 2392 struct isert_device *device = isert_conn->device; 2393 struct ib_device *ib_dev = device->ib_device; 2394 u32 sg_off, page_off; 2395 int i = 0, sg_nents; 2396 2397 sg_off = offset / PAGE_SIZE; 2398 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 2399 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge); 2400 page_off = offset % PAGE_SIZE; 2401 2402 send_wr->sg_list = ib_sge; 2403 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 2404 /* 2405 * Perform mapping of TCM scatterlist memory ib_sge dma_addr. 2406 */ 2407 for_each_sg(sg_start, tmp_sg, sg_nents, i) { 2408 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, " 2409 "page_off: %u\n", 2410 (unsigned long long)tmp_sg->dma_address, 2411 tmp_sg->length, page_off); 2412 2413 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off; 2414 ib_sge->length = min_t(u32, data_left, 2415 ib_sg_dma_len(ib_dev, tmp_sg) - page_off); 2416 ib_sge->lkey = device->pd->local_dma_lkey; 2417 2418 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n", 2419 ib_sge->addr, ib_sge->length, ib_sge->lkey); 2420 page_off = 0; 2421 data_left -= ib_sge->length; 2422 if (!data_left) 2423 break; 2424 ib_sge++; 2425 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge); 2426 } 2427 2428 send_wr->num_sge = ++i; 2429 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n", 2430 send_wr->sg_list, send_wr->num_sge); 2431 2432 return send_wr->num_sge; 2433 } 2434 2435 static int 2436 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2437 struct isert_rdma_wr *wr) 2438 { 2439 struct se_cmd *se_cmd = &cmd->se_cmd; 2440 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2441 struct isert_conn *isert_conn = conn->context; 2442 struct isert_data_buf *data = &wr->data; 2443 struct ib_send_wr *send_wr; 2444 struct ib_sge *ib_sge; 2445 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0; 2446 int ret = 0, i, ib_sge_cnt; 2447 2448 isert_cmd->tx_desc.isert_cmd = isert_cmd; 2449 2450 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; 2451 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, 2452 se_cmd->t_data_nents, se_cmd->data_length, 2453 offset, wr->iser_ib_op, &wr->data); 2454 if (ret) 2455 return ret; 2456 2457 data_left = data->len; 2458 offset = data->offset; 2459 2460 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL); 2461 if (!ib_sge) { 2462 isert_warn("Unable to allocate ib_sge\n"); 2463 ret = -ENOMEM; 2464 goto unmap_cmd; 2465 } 2466 wr->ib_sge = ib_sge; 2467 2468 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge); 2469 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num, 2470 GFP_KERNEL); 2471 if (!wr->send_wr) { 2472 isert_dbg("Unable to allocate wr->send_wr\n"); 2473 ret = -ENOMEM; 2474 goto unmap_cmd; 2475 } 2476 2477 wr->isert_cmd = isert_cmd; 2478 rdma_write_max = isert_conn->max_sge * PAGE_SIZE; 2479 2480 for (i = 0; i < wr->send_wr_num; i++) { 2481 send_wr = &isert_cmd->rdma_wr.send_wr[i]; 2482 data_len = min(data_left, rdma_write_max); 2483 2484 send_wr->send_flags = 0; 2485 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { 2486 send_wr->opcode = IB_WR_RDMA_WRITE; 2487 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset; 2488 send_wr->wr.rdma.rkey = isert_cmd->read_stag; 2489 if (i + 1 == wr->send_wr_num) 2490 send_wr->next = &isert_cmd->tx_desc.send_wr; 2491 else 2492 send_wr->next = &wr->send_wr[i + 1]; 2493 } else { 2494 send_wr->opcode = IB_WR_RDMA_READ; 2495 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset; 2496 send_wr->wr.rdma.rkey = isert_cmd->write_stag; 2497 if (i + 1 == wr->send_wr_num) 2498 send_wr->send_flags = IB_SEND_SIGNALED; 2499 else 2500 send_wr->next = &wr->send_wr[i + 1]; 2501 } 2502 2503 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge, 2504 send_wr, data_len, offset); 2505 ib_sge += ib_sge_cnt; 2506 2507 offset += data_len; 2508 va_offset += data_len; 2509 data_left -= data_len; 2510 } 2511 2512 return 0; 2513 unmap_cmd: 2514 isert_unmap_data_buf(isert_conn, data); 2515 2516 return ret; 2517 } 2518 2519 static int 2520 isert_map_fr_pagelist(struct ib_device *ib_dev, 2521 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl) 2522 { 2523 u64 start_addr, end_addr, page, chunk_start = 0; 2524 struct scatterlist *tmp_sg; 2525 int i = 0, new_chunk, last_ent, n_pages; 2526 2527 n_pages = 0; 2528 new_chunk = 1; 2529 last_ent = sg_nents - 1; 2530 for_each_sg(sg_start, tmp_sg, sg_nents, i) { 2531 start_addr = ib_sg_dma_address(ib_dev, tmp_sg); 2532 if (new_chunk) 2533 chunk_start = start_addr; 2534 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg); 2535 2536 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n", 2537 i, (unsigned long long)tmp_sg->dma_address, 2538 tmp_sg->length); 2539 2540 if ((end_addr & ~PAGE_MASK) && i < last_ent) { 2541 new_chunk = 0; 2542 continue; 2543 } 2544 new_chunk = 1; 2545 2546 page = chunk_start & PAGE_MASK; 2547 do { 2548 fr_pl[n_pages++] = page; 2549 isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n", 2550 n_pages - 1, page); 2551 page += PAGE_SIZE; 2552 } while (page < end_addr); 2553 } 2554 2555 return n_pages; 2556 } 2557 2558 static inline void 2559 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr) 2560 { 2561 u32 rkey; 2562 2563 memset(inv_wr, 0, sizeof(*inv_wr)); 2564 inv_wr->wr_id = ISER_FASTREG_LI_WRID; 2565 inv_wr->opcode = IB_WR_LOCAL_INV; 2566 inv_wr->ex.invalidate_rkey = mr->rkey; 2567 2568 /* Bump the key */ 2569 rkey = ib_inc_rkey(mr->rkey); 2570 ib_update_fast_reg_key(mr, rkey); 2571 } 2572 2573 static int 2574 isert_fast_reg_mr(struct isert_conn *isert_conn, 2575 struct fast_reg_descriptor *fr_desc, 2576 struct isert_data_buf *mem, 2577 enum isert_indicator ind, 2578 struct ib_sge *sge) 2579 { 2580 struct isert_device *device = isert_conn->device; 2581 struct ib_device *ib_dev = device->ib_device; 2582 struct ib_mr *mr; 2583 struct ib_fast_reg_page_list *frpl; 2584 struct ib_send_wr fr_wr, inv_wr; 2585 struct ib_send_wr *bad_wr, *wr = NULL; 2586 int ret, pagelist_len; 2587 u32 page_off; 2588 2589 if (mem->dma_nents == 1) { 2590 sge->lkey = device->pd->local_dma_lkey; 2591 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]); 2592 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]); 2593 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", 2594 sge->addr, sge->length, sge->lkey); 2595 return 0; 2596 } 2597 2598 if (ind == ISERT_DATA_KEY_VALID) { 2599 /* Registering data buffer */ 2600 mr = fr_desc->data_mr; 2601 frpl = fr_desc->data_frpl; 2602 } else { 2603 /* Registering protection buffer */ 2604 mr = fr_desc->pi_ctx->prot_mr; 2605 frpl = fr_desc->pi_ctx->prot_frpl; 2606 } 2607 2608 page_off = mem->offset % PAGE_SIZE; 2609 2610 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n", 2611 fr_desc, mem->nents, mem->offset); 2612 2613 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents, 2614 &frpl->page_list[0]); 2615 2616 if (!(fr_desc->ind & ind)) { 2617 isert_inv_rkey(&inv_wr, mr); 2618 wr = &inv_wr; 2619 } 2620 2621 /* Prepare FASTREG WR */ 2622 memset(&fr_wr, 0, sizeof(fr_wr)); 2623 fr_wr.wr_id = ISER_FASTREG_LI_WRID; 2624 fr_wr.opcode = IB_WR_FAST_REG_MR; 2625 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off; 2626 fr_wr.wr.fast_reg.page_list = frpl; 2627 fr_wr.wr.fast_reg.page_list_len = pagelist_len; 2628 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; 2629 fr_wr.wr.fast_reg.length = mem->len; 2630 fr_wr.wr.fast_reg.rkey = mr->rkey; 2631 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE; 2632 2633 if (!wr) 2634 wr = &fr_wr; 2635 else 2636 wr->next = &fr_wr; 2637 2638 ret = ib_post_send(isert_conn->qp, wr, &bad_wr); 2639 if (ret) { 2640 isert_err("fast registration failed, ret:%d\n", ret); 2641 return ret; 2642 } 2643 fr_desc->ind &= ~ind; 2644 2645 sge->lkey = mr->lkey; 2646 sge->addr = frpl->page_list[0] + page_off; 2647 sge->length = mem->len; 2648 2649 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", 2650 sge->addr, sge->length, sge->lkey); 2651 2652 return ret; 2653 } 2654 2655 static inline void 2656 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs, 2657 struct ib_sig_domain *domain) 2658 { 2659 domain->sig_type = IB_SIG_TYPE_T10_DIF; 2660 domain->sig.dif.bg_type = IB_T10DIF_CRC; 2661 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; 2662 domain->sig.dif.ref_tag = se_cmd->reftag_seed; 2663 /* 2664 * At the moment we hard code those, but if in the future 2665 * the target core would like to use it, we will take it 2666 * from se_cmd. 2667 */ 2668 domain->sig.dif.apptag_check_mask = 0xffff; 2669 domain->sig.dif.app_escape = true; 2670 domain->sig.dif.ref_escape = true; 2671 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || 2672 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) 2673 domain->sig.dif.ref_remap = true; 2674 }; 2675 2676 static int 2677 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) 2678 { 2679 switch (se_cmd->prot_op) { 2680 case TARGET_PROT_DIN_INSERT: 2681 case TARGET_PROT_DOUT_STRIP: 2682 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; 2683 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2684 break; 2685 case TARGET_PROT_DOUT_INSERT: 2686 case TARGET_PROT_DIN_STRIP: 2687 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 2688 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2689 break; 2690 case TARGET_PROT_DIN_PASS: 2691 case TARGET_PROT_DOUT_PASS: 2692 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2693 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2694 break; 2695 default: 2696 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); 2697 return -EINVAL; 2698 } 2699 2700 return 0; 2701 } 2702 2703 static inline u8 2704 isert_set_prot_checks(u8 prot_checks) 2705 { 2706 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) | 2707 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) | 2708 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0); 2709 } 2710 2711 static int 2712 isert_reg_sig_mr(struct isert_conn *isert_conn, 2713 struct se_cmd *se_cmd, 2714 struct isert_rdma_wr *rdma_wr, 2715 struct fast_reg_descriptor *fr_desc) 2716 { 2717 struct ib_send_wr sig_wr, inv_wr; 2718 struct ib_send_wr *bad_wr, *wr = NULL; 2719 struct pi_context *pi_ctx = fr_desc->pi_ctx; 2720 struct ib_sig_attrs sig_attrs; 2721 int ret; 2722 2723 memset(&sig_attrs, 0, sizeof(sig_attrs)); 2724 ret = isert_set_sig_attrs(se_cmd, &sig_attrs); 2725 if (ret) 2726 goto err; 2727 2728 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks); 2729 2730 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) { 2731 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr); 2732 wr = &inv_wr; 2733 } 2734 2735 memset(&sig_wr, 0, sizeof(sig_wr)); 2736 sig_wr.opcode = IB_WR_REG_SIG_MR; 2737 sig_wr.wr_id = ISER_FASTREG_LI_WRID; 2738 sig_wr.sg_list = &rdma_wr->ib_sg[DATA]; 2739 sig_wr.num_sge = 1; 2740 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE; 2741 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs; 2742 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr; 2743 if (se_cmd->t_prot_sg) 2744 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT]; 2745 2746 if (!wr) 2747 wr = &sig_wr; 2748 else 2749 wr->next = &sig_wr; 2750 2751 ret = ib_post_send(isert_conn->qp, wr, &bad_wr); 2752 if (ret) { 2753 isert_err("fast registration failed, ret:%d\n", ret); 2754 goto err; 2755 } 2756 fr_desc->ind &= ~ISERT_SIG_KEY_VALID; 2757 2758 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey; 2759 rdma_wr->ib_sg[SIG].addr = 0; 2760 rdma_wr->ib_sg[SIG].length = se_cmd->data_length; 2761 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP && 2762 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT) 2763 /* 2764 * We have protection guards on the wire 2765 * so we need to set a larget transfer 2766 */ 2767 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length; 2768 2769 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n", 2770 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length, 2771 rdma_wr->ib_sg[SIG].lkey); 2772 err: 2773 return ret; 2774 } 2775 2776 static int 2777 isert_handle_prot_cmd(struct isert_conn *isert_conn, 2778 struct isert_cmd *isert_cmd, 2779 struct isert_rdma_wr *wr) 2780 { 2781 struct isert_device *device = isert_conn->device; 2782 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd; 2783 int ret; 2784 2785 if (!wr->fr_desc->pi_ctx) { 2786 ret = isert_create_pi_ctx(wr->fr_desc, 2787 device->ib_device, 2788 device->pd); 2789 if (ret) { 2790 isert_err("conn %p failed to allocate pi_ctx\n", 2791 isert_conn); 2792 return ret; 2793 } 2794 } 2795 2796 if (se_cmd->t_prot_sg) { 2797 ret = isert_map_data_buf(isert_conn, isert_cmd, 2798 se_cmd->t_prot_sg, 2799 se_cmd->t_prot_nents, 2800 se_cmd->prot_length, 2801 0, wr->iser_ib_op, &wr->prot); 2802 if (ret) { 2803 isert_err("conn %p failed to map protection buffer\n", 2804 isert_conn); 2805 return ret; 2806 } 2807 2808 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT])); 2809 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot, 2810 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]); 2811 if (ret) { 2812 isert_err("conn %p failed to fast reg mr\n", 2813 isert_conn); 2814 goto unmap_prot_cmd; 2815 } 2816 } 2817 2818 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc); 2819 if (ret) { 2820 isert_err("conn %p failed to fast reg mr\n", 2821 isert_conn); 2822 goto unmap_prot_cmd; 2823 } 2824 wr->fr_desc->ind |= ISERT_PROTECTED; 2825 2826 return 0; 2827 2828 unmap_prot_cmd: 2829 if (se_cmd->t_prot_sg) 2830 isert_unmap_data_buf(isert_conn, &wr->prot); 2831 2832 return ret; 2833 } 2834 2835 static int 2836 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2837 struct isert_rdma_wr *wr) 2838 { 2839 struct se_cmd *se_cmd = &cmd->se_cmd; 2840 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2841 struct isert_conn *isert_conn = conn->context; 2842 struct fast_reg_descriptor *fr_desc = NULL; 2843 struct ib_send_wr *send_wr; 2844 struct ib_sge *ib_sg; 2845 u32 offset; 2846 int ret = 0; 2847 unsigned long flags; 2848 2849 isert_cmd->tx_desc.isert_cmd = isert_cmd; 2850 2851 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; 2852 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, 2853 se_cmd->t_data_nents, se_cmd->data_length, 2854 offset, wr->iser_ib_op, &wr->data); 2855 if (ret) 2856 return ret; 2857 2858 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) { 2859 spin_lock_irqsave(&isert_conn->pool_lock, flags); 2860 fr_desc = list_first_entry(&isert_conn->fr_pool, 2861 struct fast_reg_descriptor, list); 2862 list_del(&fr_desc->list); 2863 spin_unlock_irqrestore(&isert_conn->pool_lock, flags); 2864 wr->fr_desc = fr_desc; 2865 } 2866 2867 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, 2868 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]); 2869 if (ret) 2870 goto unmap_cmd; 2871 2872 if (isert_prot_cmd(isert_conn, se_cmd)) { 2873 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr); 2874 if (ret) 2875 goto unmap_cmd; 2876 2877 ib_sg = &wr->ib_sg[SIG]; 2878 } else { 2879 ib_sg = &wr->ib_sg[DATA]; 2880 } 2881 2882 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg)); 2883 wr->ib_sge = &wr->s_ib_sge; 2884 wr->send_wr_num = 1; 2885 memset(&wr->s_send_wr, 0, sizeof(*send_wr)); 2886 wr->send_wr = &wr->s_send_wr; 2887 wr->isert_cmd = isert_cmd; 2888 2889 send_wr = &isert_cmd->rdma_wr.s_send_wr; 2890 send_wr->sg_list = &wr->s_ib_sge; 2891 send_wr->num_sge = 1; 2892 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 2893 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { 2894 send_wr->opcode = IB_WR_RDMA_WRITE; 2895 send_wr->wr.rdma.remote_addr = isert_cmd->read_va; 2896 send_wr->wr.rdma.rkey = isert_cmd->read_stag; 2897 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ? 2898 0 : IB_SEND_SIGNALED; 2899 } else { 2900 send_wr->opcode = IB_WR_RDMA_READ; 2901 send_wr->wr.rdma.remote_addr = isert_cmd->write_va; 2902 send_wr->wr.rdma.rkey = isert_cmd->write_stag; 2903 send_wr->send_flags = IB_SEND_SIGNALED; 2904 } 2905 2906 return 0; 2907 2908 unmap_cmd: 2909 if (fr_desc) { 2910 spin_lock_irqsave(&isert_conn->pool_lock, flags); 2911 list_add_tail(&fr_desc->list, &isert_conn->fr_pool); 2912 spin_unlock_irqrestore(&isert_conn->pool_lock, flags); 2913 } 2914 isert_unmap_data_buf(isert_conn, &wr->data); 2915 2916 return ret; 2917 } 2918 2919 static int 2920 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2921 { 2922 struct se_cmd *se_cmd = &cmd->se_cmd; 2923 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2924 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 2925 struct isert_conn *isert_conn = conn->context; 2926 struct isert_device *device = isert_conn->device; 2927 struct ib_send_wr *wr_failed; 2928 int rc; 2929 2930 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", 2931 isert_cmd, se_cmd->data_length); 2932 2933 wr->iser_ib_op = ISER_IB_RDMA_WRITE; 2934 rc = device->reg_rdma_mem(conn, cmd, wr); 2935 if (rc) { 2936 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); 2937 return rc; 2938 } 2939 2940 if (!isert_prot_cmd(isert_conn, se_cmd)) { 2941 /* 2942 * Build isert_conn->tx_desc for iSCSI response PDU and attach 2943 */ 2944 isert_create_send_desc(isert_conn, isert_cmd, 2945 &isert_cmd->tx_desc); 2946 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) 2947 &isert_cmd->tx_desc.iscsi_header); 2948 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2949 isert_init_send_wr(isert_conn, isert_cmd, 2950 &isert_cmd->tx_desc.send_wr); 2951 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr; 2952 wr->send_wr_num += 1; 2953 } 2954 2955 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); 2956 if (rc) 2957 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n"); 2958 2959 if (!isert_prot_cmd(isert_conn, se_cmd)) 2960 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data " 2961 "READ\n", isert_cmd); 2962 else 2963 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", 2964 isert_cmd); 2965 2966 return 1; 2967 } 2968 2969 static int 2970 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) 2971 { 2972 struct se_cmd *se_cmd = &cmd->se_cmd; 2973 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2974 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 2975 struct isert_conn *isert_conn = conn->context; 2976 struct isert_device *device = isert_conn->device; 2977 struct ib_send_wr *wr_failed; 2978 int rc; 2979 2980 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", 2981 isert_cmd, se_cmd->data_length, cmd->write_data_done); 2982 wr->iser_ib_op = ISER_IB_RDMA_READ; 2983 rc = device->reg_rdma_mem(conn, cmd, wr); 2984 if (rc) { 2985 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); 2986 return rc; 2987 } 2988 2989 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); 2990 if (rc) 2991 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n"); 2992 2993 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", 2994 isert_cmd); 2995 2996 return 0; 2997 } 2998 2999 static int 3000 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3001 { 3002 int ret; 3003 3004 switch (state) { 3005 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3006 ret = isert_put_nopin(cmd, conn, false); 3007 break; 3008 default: 3009 isert_err("Unknown immediate state: 0x%02x\n", state); 3010 ret = -EINVAL; 3011 break; 3012 } 3013 3014 return ret; 3015 } 3016 3017 static int 3018 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3019 { 3020 struct isert_conn *isert_conn = conn->context; 3021 int ret; 3022 3023 switch (state) { 3024 case ISTATE_SEND_LOGOUTRSP: 3025 ret = isert_put_logout_rsp(cmd, conn); 3026 if (!ret) 3027 isert_conn->logout_posted = true; 3028 break; 3029 case ISTATE_SEND_NOPIN: 3030 ret = isert_put_nopin(cmd, conn, true); 3031 break; 3032 case ISTATE_SEND_TASKMGTRSP: 3033 ret = isert_put_tm_rsp(cmd, conn); 3034 break; 3035 case ISTATE_SEND_REJECT: 3036 ret = isert_put_reject(cmd, conn); 3037 break; 3038 case ISTATE_SEND_TEXTRSP: 3039 ret = isert_put_text_rsp(cmd, conn); 3040 break; 3041 case ISTATE_SEND_STATUS: 3042 /* 3043 * Special case for sending non GOOD SCSI status from TX thread 3044 * context during pre se_cmd excecution failure. 3045 */ 3046 ret = isert_put_response(conn, cmd); 3047 break; 3048 default: 3049 isert_err("Unknown response state: 0x%02x\n", state); 3050 ret = -EINVAL; 3051 break; 3052 } 3053 3054 return ret; 3055 } 3056 3057 struct rdma_cm_id * 3058 isert_setup_id(struct isert_np *isert_np) 3059 { 3060 struct iscsi_np *np = isert_np->np; 3061 struct rdma_cm_id *id; 3062 struct sockaddr *sa; 3063 int ret; 3064 3065 sa = (struct sockaddr *)&np->np_sockaddr; 3066 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); 3067 3068 id = rdma_create_id(isert_cma_handler, isert_np, 3069 RDMA_PS_TCP, IB_QPT_RC); 3070 if (IS_ERR(id)) { 3071 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); 3072 ret = PTR_ERR(id); 3073 goto out; 3074 } 3075 isert_dbg("id %p context %p\n", id, id->context); 3076 3077 ret = rdma_bind_addr(id, sa); 3078 if (ret) { 3079 isert_err("rdma_bind_addr() failed: %d\n", ret); 3080 goto out_id; 3081 } 3082 3083 ret = rdma_listen(id, 0); 3084 if (ret) { 3085 isert_err("rdma_listen() failed: %d\n", ret); 3086 goto out_id; 3087 } 3088 3089 return id; 3090 out_id: 3091 rdma_destroy_id(id); 3092 out: 3093 return ERR_PTR(ret); 3094 } 3095 3096 static int 3097 isert_setup_np(struct iscsi_np *np, 3098 struct __kernel_sockaddr_storage *ksockaddr) 3099 { 3100 struct isert_np *isert_np; 3101 struct rdma_cm_id *isert_lid; 3102 int ret; 3103 3104 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); 3105 if (!isert_np) { 3106 isert_err("Unable to allocate struct isert_np\n"); 3107 return -ENOMEM; 3108 } 3109 sema_init(&isert_np->np_sem, 0); 3110 mutex_init(&isert_np->np_accept_mutex); 3111 INIT_LIST_HEAD(&isert_np->np_accept_list); 3112 init_completion(&isert_np->np_login_comp); 3113 isert_np->np = np; 3114 3115 /* 3116 * Setup the np->np_sockaddr from the passed sockaddr setup 3117 * in iscsi_target_configfs.c code.. 3118 */ 3119 memcpy(&np->np_sockaddr, ksockaddr, 3120 sizeof(struct __kernel_sockaddr_storage)); 3121 3122 isert_lid = isert_setup_id(isert_np); 3123 if (IS_ERR(isert_lid)) { 3124 ret = PTR_ERR(isert_lid); 3125 goto out; 3126 } 3127 3128 isert_np->np_cm_id = isert_lid; 3129 np->np_context = isert_np; 3130 3131 return 0; 3132 3133 out: 3134 kfree(isert_np); 3135 3136 return ret; 3137 } 3138 3139 static int 3140 isert_rdma_accept(struct isert_conn *isert_conn) 3141 { 3142 struct rdma_cm_id *cm_id = isert_conn->cm_id; 3143 struct rdma_conn_param cp; 3144 int ret; 3145 3146 memset(&cp, 0, sizeof(struct rdma_conn_param)); 3147 cp.initiator_depth = isert_conn->initiator_depth; 3148 cp.retry_count = 7; 3149 cp.rnr_retry_count = 7; 3150 3151 ret = rdma_accept(cm_id, &cp); 3152 if (ret) { 3153 isert_err("rdma_accept() failed with: %d\n", ret); 3154 return ret; 3155 } 3156 3157 return 0; 3158 } 3159 3160 static int 3161 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 3162 { 3163 struct isert_conn *isert_conn = conn->context; 3164 int ret; 3165 3166 isert_info("before login_req comp conn: %p\n", isert_conn); 3167 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); 3168 if (ret) { 3169 isert_err("isert_conn %p interrupted before got login req\n", 3170 isert_conn); 3171 return ret; 3172 } 3173 reinit_completion(&isert_conn->login_req_comp); 3174 3175 /* 3176 * For login requests after the first PDU, isert_rx_login_req() will 3177 * kick schedule_delayed_work(&conn->login_work) as the packet is 3178 * received, which turns this callback from iscsi_target_do_login_rx() 3179 * into a NOP. 3180 */ 3181 if (!login->first_request) 3182 return 0; 3183 3184 isert_rx_login_req(isert_conn); 3185 3186 isert_info("before login_comp conn: %p\n", conn); 3187 ret = wait_for_completion_interruptible(&isert_conn->login_comp); 3188 if (ret) 3189 return ret; 3190 3191 isert_info("processing login->req: %p\n", login->req); 3192 3193 return 0; 3194 } 3195 3196 static void 3197 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, 3198 struct isert_conn *isert_conn) 3199 { 3200 struct rdma_cm_id *cm_id = isert_conn->cm_id; 3201 struct rdma_route *cm_route = &cm_id->route; 3202 struct sockaddr_in *sock_in; 3203 struct sockaddr_in6 *sock_in6; 3204 3205 conn->login_family = np->np_sockaddr.ss_family; 3206 3207 if (np->np_sockaddr.ss_family == AF_INET6) { 3208 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr; 3209 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c", 3210 &sock_in6->sin6_addr.in6_u); 3211 conn->login_port = ntohs(sock_in6->sin6_port); 3212 3213 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr; 3214 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c", 3215 &sock_in6->sin6_addr.in6_u); 3216 conn->local_port = ntohs(sock_in6->sin6_port); 3217 } else { 3218 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr; 3219 sprintf(conn->login_ip, "%pI4", 3220 &sock_in->sin_addr.s_addr); 3221 conn->login_port = ntohs(sock_in->sin_port); 3222 3223 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr; 3224 sprintf(conn->local_ip, "%pI4", 3225 &sock_in->sin_addr.s_addr); 3226 conn->local_port = ntohs(sock_in->sin_port); 3227 } 3228 } 3229 3230 static int 3231 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 3232 { 3233 struct isert_np *isert_np = np->np_context; 3234 struct isert_conn *isert_conn; 3235 int ret; 3236 3237 accept_wait: 3238 ret = down_interruptible(&isert_np->np_sem); 3239 if (ret) 3240 return -ENODEV; 3241 3242 spin_lock_bh(&np->np_thread_lock); 3243 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { 3244 spin_unlock_bh(&np->np_thread_lock); 3245 isert_dbg("np_thread_state %d\n", 3246 np->np_thread_state); 3247 /** 3248 * No point in stalling here when np_thread 3249 * is in state RESET/SHUTDOWN/EXIT - bail 3250 **/ 3251 return -ENODEV; 3252 } 3253 spin_unlock_bh(&np->np_thread_lock); 3254 3255 mutex_lock(&isert_np->np_accept_mutex); 3256 if (list_empty(&isert_np->np_accept_list)) { 3257 mutex_unlock(&isert_np->np_accept_mutex); 3258 goto accept_wait; 3259 } 3260 isert_conn = list_first_entry(&isert_np->np_accept_list, 3261 struct isert_conn, accept_node); 3262 list_del_init(&isert_conn->accept_node); 3263 mutex_unlock(&isert_np->np_accept_mutex); 3264 3265 conn->context = isert_conn; 3266 isert_conn->conn = conn; 3267 3268 isert_set_conn_info(np, conn, isert_conn); 3269 3270 isert_dbg("Processing isert_conn: %p\n", isert_conn); 3271 3272 return 0; 3273 } 3274 3275 static void 3276 isert_free_np(struct iscsi_np *np) 3277 { 3278 struct isert_np *isert_np = np->np_context; 3279 struct isert_conn *isert_conn, *n; 3280 3281 if (isert_np->np_cm_id) 3282 rdma_destroy_id(isert_np->np_cm_id); 3283 3284 /* 3285 * FIXME: At this point we don't have a good way to insure 3286 * that at this point we don't have hanging connections that 3287 * completed RDMA establishment but didn't start iscsi login 3288 * process. So work-around this by cleaning up what ever piled 3289 * up in np_accept_list. 3290 */ 3291 mutex_lock(&isert_np->np_accept_mutex); 3292 if (!list_empty(&isert_np->np_accept_list)) { 3293 isert_info("Still have isert connections, cleaning up...\n"); 3294 list_for_each_entry_safe(isert_conn, n, 3295 &isert_np->np_accept_list, 3296 accept_node) { 3297 isert_info("cleaning isert_conn %p state (%d)\n", 3298 isert_conn, isert_conn->state); 3299 isert_connect_release(isert_conn); 3300 } 3301 } 3302 mutex_unlock(&isert_np->np_accept_mutex); 3303 3304 np->np_context = NULL; 3305 kfree(isert_np); 3306 } 3307 3308 static void isert_release_work(struct work_struct *work) 3309 { 3310 struct isert_conn *isert_conn = container_of(work, 3311 struct isert_conn, 3312 release_work); 3313 3314 isert_info("Starting release conn %p\n", isert_conn); 3315 3316 wait_for_completion(&isert_conn->wait); 3317 3318 mutex_lock(&isert_conn->mutex); 3319 isert_conn->state = ISER_CONN_DOWN; 3320 mutex_unlock(&isert_conn->mutex); 3321 3322 isert_info("Destroying conn %p\n", isert_conn); 3323 isert_put_conn(isert_conn); 3324 } 3325 3326 static void 3327 isert_wait4logout(struct isert_conn *isert_conn) 3328 { 3329 struct iscsi_conn *conn = isert_conn->conn; 3330 3331 isert_info("conn %p\n", isert_conn); 3332 3333 if (isert_conn->logout_posted) { 3334 isert_info("conn %p wait for conn_logout_comp\n", isert_conn); 3335 wait_for_completion_timeout(&conn->conn_logout_comp, 3336 SECONDS_FOR_LOGOUT_COMP * HZ); 3337 } 3338 } 3339 3340 static void 3341 isert_wait4cmds(struct iscsi_conn *conn) 3342 { 3343 isert_info("iscsi_conn %p\n", conn); 3344 3345 if (conn->sess) { 3346 target_sess_cmd_list_set_waiting(conn->sess->se_sess); 3347 target_wait_for_sess_cmds(conn->sess->se_sess); 3348 } 3349 } 3350 3351 static void 3352 isert_wait4flush(struct isert_conn *isert_conn) 3353 { 3354 struct ib_recv_wr *bad_wr; 3355 3356 isert_info("conn %p\n", isert_conn); 3357 3358 init_completion(&isert_conn->wait_comp_err); 3359 isert_conn->beacon.wr_id = ISER_BEACON_WRID; 3360 /* post an indication that all flush errors were consumed */ 3361 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) { 3362 isert_err("conn %p failed to post beacon", isert_conn); 3363 return; 3364 } 3365 3366 wait_for_completion(&isert_conn->wait_comp_err); 3367 } 3368 3369 static void isert_wait_conn(struct iscsi_conn *conn) 3370 { 3371 struct isert_conn *isert_conn = conn->context; 3372 3373 isert_info("Starting conn %p\n", isert_conn); 3374 3375 mutex_lock(&isert_conn->mutex); 3376 /* 3377 * Only wait for wait_comp_err if the isert_conn made it 3378 * into full feature phase.. 3379 */ 3380 if (isert_conn->state == ISER_CONN_INIT) { 3381 mutex_unlock(&isert_conn->mutex); 3382 return; 3383 } 3384 isert_conn_terminate(isert_conn); 3385 mutex_unlock(&isert_conn->mutex); 3386 3387 isert_wait4cmds(conn); 3388 isert_wait4flush(isert_conn); 3389 isert_wait4logout(isert_conn); 3390 3391 queue_work(isert_release_wq, &isert_conn->release_work); 3392 } 3393 3394 static void isert_free_conn(struct iscsi_conn *conn) 3395 { 3396 struct isert_conn *isert_conn = conn->context; 3397 3398 isert_wait4flush(isert_conn); 3399 isert_put_conn(isert_conn); 3400 } 3401 3402 static struct iscsit_transport iser_target_transport = { 3403 .name = "IB/iSER", 3404 .transport_type = ISCSI_INFINIBAND, 3405 .priv_size = sizeof(struct isert_cmd), 3406 .owner = THIS_MODULE, 3407 .iscsit_setup_np = isert_setup_np, 3408 .iscsit_accept_np = isert_accept_np, 3409 .iscsit_free_np = isert_free_np, 3410 .iscsit_wait_conn = isert_wait_conn, 3411 .iscsit_free_conn = isert_free_conn, 3412 .iscsit_get_login_rx = isert_get_login_rx, 3413 .iscsit_put_login_tx = isert_put_login_tx, 3414 .iscsit_immediate_queue = isert_immediate_queue, 3415 .iscsit_response_queue = isert_response_queue, 3416 .iscsit_get_dataout = isert_get_dataout, 3417 .iscsit_queue_data_in = isert_put_datain, 3418 .iscsit_queue_status = isert_put_response, 3419 .iscsit_aborted_task = isert_aborted_task, 3420 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, 3421 }; 3422 3423 static int __init isert_init(void) 3424 { 3425 int ret; 3426 3427 isert_comp_wq = alloc_workqueue("isert_comp_wq", 3428 WQ_UNBOUND | WQ_HIGHPRI, 0); 3429 if (!isert_comp_wq) { 3430 isert_err("Unable to allocate isert_comp_wq\n"); 3431 ret = -ENOMEM; 3432 return -ENOMEM; 3433 } 3434 3435 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, 3436 WQ_UNBOUND_MAX_ACTIVE); 3437 if (!isert_release_wq) { 3438 isert_err("Unable to allocate isert_release_wq\n"); 3439 ret = -ENOMEM; 3440 goto destroy_comp_wq; 3441 } 3442 3443 iscsit_register_transport(&iser_target_transport); 3444 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); 3445 3446 return 0; 3447 3448 destroy_comp_wq: 3449 destroy_workqueue(isert_comp_wq); 3450 3451 return ret; 3452 } 3453 3454 static void __exit isert_exit(void) 3455 { 3456 flush_scheduled_work(); 3457 destroy_workqueue(isert_release_wq); 3458 destroy_workqueue(isert_comp_wq); 3459 iscsit_unregister_transport(&iser_target_transport); 3460 isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); 3461 } 3462 3463 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); 3464 MODULE_VERSION("1.0"); 3465 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 3466 MODULE_LICENSE("GPL"); 3467 3468 module_init(isert_init); 3469 module_exit(isert_exit); 3470