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->mr->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 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE); 389 if (IS_ERR(device->mr)) { 390 ret = PTR_ERR(device->mr); 391 isert_err("failed to create dma mr, device %p, ret=%d\n", 392 device, ret); 393 goto out_mr; 394 } 395 396 /* Check signature cap */ 397 device->pi_capable = dev_attr->device_cap_flags & 398 IB_DEVICE_SIGNATURE_HANDOVER ? true : false; 399 400 return 0; 401 402 out_mr: 403 ib_dealloc_pd(device->pd); 404 out_cq: 405 isert_free_comps(device); 406 return ret; 407 } 408 409 static void 410 isert_free_device_ib_res(struct isert_device *device) 411 { 412 isert_info("device %p\n", device); 413 414 ib_dereg_mr(device->mr); 415 ib_dealloc_pd(device->pd); 416 isert_free_comps(device); 417 } 418 419 static void 420 isert_device_put(struct isert_device *device) 421 { 422 mutex_lock(&device_list_mutex); 423 device->refcount--; 424 isert_info("device %p refcount %d\n", device, device->refcount); 425 if (!device->refcount) { 426 isert_free_device_ib_res(device); 427 list_del(&device->dev_node); 428 kfree(device); 429 } 430 mutex_unlock(&device_list_mutex); 431 } 432 433 static struct isert_device * 434 isert_device_get(struct rdma_cm_id *cma_id) 435 { 436 struct isert_device *device; 437 int ret; 438 439 mutex_lock(&device_list_mutex); 440 list_for_each_entry(device, &device_list, dev_node) { 441 if (device->ib_device->node_guid == cma_id->device->node_guid) { 442 device->refcount++; 443 isert_info("Found iser device %p refcount %d\n", 444 device, device->refcount); 445 mutex_unlock(&device_list_mutex); 446 return device; 447 } 448 } 449 450 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL); 451 if (!device) { 452 mutex_unlock(&device_list_mutex); 453 return ERR_PTR(-ENOMEM); 454 } 455 456 INIT_LIST_HEAD(&device->dev_node); 457 458 device->ib_device = cma_id->device; 459 ret = isert_create_device_ib_res(device); 460 if (ret) { 461 kfree(device); 462 mutex_unlock(&device_list_mutex); 463 return ERR_PTR(ret); 464 } 465 466 device->refcount++; 467 list_add_tail(&device->dev_node, &device_list); 468 isert_info("Created a new iser device %p refcount %d\n", 469 device, device->refcount); 470 mutex_unlock(&device_list_mutex); 471 472 return device; 473 } 474 475 static void 476 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn) 477 { 478 struct fast_reg_descriptor *fr_desc, *tmp; 479 int i = 0; 480 481 if (list_empty(&isert_conn->fr_pool)) 482 return; 483 484 isert_info("Freeing conn %p fastreg pool", isert_conn); 485 486 list_for_each_entry_safe(fr_desc, tmp, 487 &isert_conn->fr_pool, list) { 488 list_del(&fr_desc->list); 489 ib_free_fast_reg_page_list(fr_desc->data_frpl); 490 ib_dereg_mr(fr_desc->data_mr); 491 if (fr_desc->pi_ctx) { 492 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl); 493 ib_dereg_mr(fr_desc->pi_ctx->prot_mr); 494 ib_destroy_mr(fr_desc->pi_ctx->sig_mr); 495 kfree(fr_desc->pi_ctx); 496 } 497 kfree(fr_desc); 498 ++i; 499 } 500 501 if (i < isert_conn->fr_pool_size) 502 isert_warn("Pool still has %d regions registered\n", 503 isert_conn->fr_pool_size - i); 504 } 505 506 static int 507 isert_create_pi_ctx(struct fast_reg_descriptor *desc, 508 struct ib_device *device, 509 struct ib_pd *pd) 510 { 511 struct ib_mr_init_attr mr_init_attr; 512 struct pi_context *pi_ctx; 513 int ret; 514 515 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL); 516 if (!pi_ctx) { 517 isert_err("Failed to allocate pi context\n"); 518 return -ENOMEM; 519 } 520 521 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device, 522 ISCSI_ISER_SG_TABLESIZE); 523 if (IS_ERR(pi_ctx->prot_frpl)) { 524 isert_err("Failed to allocate prot frpl err=%ld\n", 525 PTR_ERR(pi_ctx->prot_frpl)); 526 ret = PTR_ERR(pi_ctx->prot_frpl); 527 goto err_pi_ctx; 528 } 529 530 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE); 531 if (IS_ERR(pi_ctx->prot_mr)) { 532 isert_err("Failed to allocate prot frmr err=%ld\n", 533 PTR_ERR(pi_ctx->prot_mr)); 534 ret = PTR_ERR(pi_ctx->prot_mr); 535 goto err_prot_frpl; 536 } 537 desc->ind |= ISERT_PROT_KEY_VALID; 538 539 memset(&mr_init_attr, 0, sizeof(mr_init_attr)); 540 mr_init_attr.max_reg_descriptors = 2; 541 mr_init_attr.flags |= IB_MR_SIGNATURE_EN; 542 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr); 543 if (IS_ERR(pi_ctx->sig_mr)) { 544 isert_err("Failed to allocate signature enabled mr err=%ld\n", 545 PTR_ERR(pi_ctx->sig_mr)); 546 ret = PTR_ERR(pi_ctx->sig_mr); 547 goto err_prot_mr; 548 } 549 550 desc->pi_ctx = pi_ctx; 551 desc->ind |= ISERT_SIG_KEY_VALID; 552 desc->ind &= ~ISERT_PROTECTED; 553 554 return 0; 555 556 err_prot_mr: 557 ib_dereg_mr(pi_ctx->prot_mr); 558 err_prot_frpl: 559 ib_free_fast_reg_page_list(pi_ctx->prot_frpl); 560 err_pi_ctx: 561 kfree(pi_ctx); 562 563 return ret; 564 } 565 566 static int 567 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd, 568 struct fast_reg_descriptor *fr_desc) 569 { 570 int ret; 571 572 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device, 573 ISCSI_ISER_SG_TABLESIZE); 574 if (IS_ERR(fr_desc->data_frpl)) { 575 isert_err("Failed to allocate data frpl err=%ld\n", 576 PTR_ERR(fr_desc->data_frpl)); 577 return PTR_ERR(fr_desc->data_frpl); 578 } 579 580 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE); 581 if (IS_ERR(fr_desc->data_mr)) { 582 isert_err("Failed to allocate data frmr err=%ld\n", 583 PTR_ERR(fr_desc->data_mr)); 584 ret = PTR_ERR(fr_desc->data_mr); 585 goto err_data_frpl; 586 } 587 fr_desc->ind |= ISERT_DATA_KEY_VALID; 588 589 isert_dbg("Created fr_desc %p\n", fr_desc); 590 591 return 0; 592 593 err_data_frpl: 594 ib_free_fast_reg_page_list(fr_desc->data_frpl); 595 596 return ret; 597 } 598 599 static int 600 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn) 601 { 602 struct fast_reg_descriptor *fr_desc; 603 struct isert_device *device = isert_conn->device; 604 struct se_session *se_sess = isert_conn->conn->sess->se_sess; 605 struct se_node_acl *se_nacl = se_sess->se_node_acl; 606 int i, ret, tag_num; 607 /* 608 * Setup the number of FRMRs based upon the number of tags 609 * available to session in iscsi_target_locate_portal(). 610 */ 611 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth); 612 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 613 614 isert_conn->fr_pool_size = 0; 615 for (i = 0; i < tag_num; i++) { 616 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL); 617 if (!fr_desc) { 618 isert_err("Failed to allocate fast_reg descriptor\n"); 619 ret = -ENOMEM; 620 goto err; 621 } 622 623 ret = isert_create_fr_desc(device->ib_device, 624 device->pd, fr_desc); 625 if (ret) { 626 isert_err("Failed to create fastreg descriptor err=%d\n", 627 ret); 628 kfree(fr_desc); 629 goto err; 630 } 631 632 list_add_tail(&fr_desc->list, &isert_conn->fr_pool); 633 isert_conn->fr_pool_size++; 634 } 635 636 isert_dbg("Creating conn %p fastreg pool size=%d", 637 isert_conn, isert_conn->fr_pool_size); 638 639 return 0; 640 641 err: 642 isert_conn_free_fastreg_pool(isert_conn); 643 return ret; 644 } 645 646 static void 647 isert_init_conn(struct isert_conn *isert_conn) 648 { 649 isert_conn->state = ISER_CONN_INIT; 650 INIT_LIST_HEAD(&isert_conn->accept_node); 651 init_completion(&isert_conn->login_comp); 652 init_completion(&isert_conn->login_req_comp); 653 init_completion(&isert_conn->wait); 654 kref_init(&isert_conn->kref); 655 mutex_init(&isert_conn->mutex); 656 spin_lock_init(&isert_conn->pool_lock); 657 INIT_LIST_HEAD(&isert_conn->fr_pool); 658 INIT_WORK(&isert_conn->release_work, isert_release_work); 659 } 660 661 static void 662 isert_free_login_buf(struct isert_conn *isert_conn) 663 { 664 struct ib_device *ib_dev = isert_conn->device->ib_device; 665 666 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma, 667 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); 668 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 669 ISCSI_DEF_MAX_RECV_SEG_LEN, 670 DMA_FROM_DEVICE); 671 kfree(isert_conn->login_buf); 672 } 673 674 static int 675 isert_alloc_login_buf(struct isert_conn *isert_conn, 676 struct ib_device *ib_dev) 677 { 678 int ret; 679 680 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN + 681 ISER_RX_LOGIN_SIZE, GFP_KERNEL); 682 if (!isert_conn->login_buf) { 683 isert_err("Unable to allocate isert_conn->login_buf\n"); 684 return -ENOMEM; 685 } 686 687 isert_conn->login_req_buf = isert_conn->login_buf; 688 isert_conn->login_rsp_buf = isert_conn->login_buf + 689 ISCSI_DEF_MAX_RECV_SEG_LEN; 690 691 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n", 692 isert_conn->login_buf, isert_conn->login_req_buf, 693 isert_conn->login_rsp_buf); 694 695 isert_conn->login_req_dma = ib_dma_map_single(ib_dev, 696 (void *)isert_conn->login_req_buf, 697 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); 698 699 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma); 700 if (ret) { 701 isert_err("login_req_dma mapping error: %d\n", ret); 702 isert_conn->login_req_dma = 0; 703 goto out_login_buf; 704 } 705 706 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev, 707 (void *)isert_conn->login_rsp_buf, 708 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE); 709 710 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma); 711 if (ret) { 712 isert_err("login_rsp_dma mapping error: %d\n", ret); 713 isert_conn->login_rsp_dma = 0; 714 goto out_req_dma_map; 715 } 716 717 return 0; 718 719 out_req_dma_map: 720 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma, 721 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE); 722 out_login_buf: 723 kfree(isert_conn->login_buf); 724 return ret; 725 } 726 727 static int 728 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 729 { 730 struct isert_np *isert_np = cma_id->context; 731 struct iscsi_np *np = isert_np->np; 732 struct isert_conn *isert_conn; 733 struct isert_device *device; 734 int ret = 0; 735 736 spin_lock_bh(&np->np_thread_lock); 737 if (!np->enabled) { 738 spin_unlock_bh(&np->np_thread_lock); 739 isert_dbg("iscsi_np is not enabled, reject connect request\n"); 740 return rdma_reject(cma_id, NULL, 0); 741 } 742 spin_unlock_bh(&np->np_thread_lock); 743 744 isert_dbg("cma_id: %p, portal: %p\n", 745 cma_id, cma_id->context); 746 747 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL); 748 if (!isert_conn) 749 return -ENOMEM; 750 751 isert_init_conn(isert_conn); 752 isert_conn->cm_id = cma_id; 753 754 ret = isert_alloc_login_buf(isert_conn, cma_id->device); 755 if (ret) 756 goto out; 757 758 device = isert_device_get(cma_id); 759 if (IS_ERR(device)) { 760 ret = PTR_ERR(device); 761 goto out_rsp_dma_map; 762 } 763 isert_conn->device = device; 764 765 /* Set max inflight RDMA READ requests */ 766 isert_conn->initiator_depth = min_t(u8, 767 event->param.conn.initiator_depth, 768 device->dev_attr.max_qp_init_rd_atom); 769 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth); 770 771 ret = isert_conn_setup_qp(isert_conn, cma_id); 772 if (ret) 773 goto out_conn_dev; 774 775 ret = isert_rdma_post_recvl(isert_conn); 776 if (ret) 777 goto out_conn_dev; 778 779 ret = isert_rdma_accept(isert_conn); 780 if (ret) 781 goto out_conn_dev; 782 783 mutex_lock(&isert_np->np_accept_mutex); 784 list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list); 785 mutex_unlock(&isert_np->np_accept_mutex); 786 787 isert_info("np %p: Allow accept_np to continue\n", np); 788 up(&isert_np->np_sem); 789 return 0; 790 791 out_conn_dev: 792 isert_device_put(device); 793 out_rsp_dma_map: 794 isert_free_login_buf(isert_conn); 795 out: 796 kfree(isert_conn); 797 rdma_reject(cma_id, NULL, 0); 798 return ret; 799 } 800 801 static void 802 isert_connect_release(struct isert_conn *isert_conn) 803 { 804 struct isert_device *device = isert_conn->device; 805 806 isert_dbg("conn %p\n", isert_conn); 807 808 BUG_ON(!device); 809 810 if (device->use_fastreg) 811 isert_conn_free_fastreg_pool(isert_conn); 812 813 isert_free_rx_descriptors(isert_conn); 814 if (isert_conn->cm_id) 815 rdma_destroy_id(isert_conn->cm_id); 816 817 if (isert_conn->qp) { 818 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context; 819 820 isert_comp_put(comp); 821 ib_destroy_qp(isert_conn->qp); 822 } 823 824 if (isert_conn->login_buf) 825 isert_free_login_buf(isert_conn); 826 827 isert_device_put(device); 828 829 kfree(isert_conn); 830 } 831 832 static void 833 isert_connected_handler(struct rdma_cm_id *cma_id) 834 { 835 struct isert_conn *isert_conn = cma_id->qp->qp_context; 836 837 isert_info("conn %p\n", isert_conn); 838 839 if (!kref_get_unless_zero(&isert_conn->kref)) { 840 isert_warn("conn %p connect_release is running\n", isert_conn); 841 return; 842 } 843 844 mutex_lock(&isert_conn->mutex); 845 if (isert_conn->state != ISER_CONN_FULL_FEATURE) 846 isert_conn->state = ISER_CONN_UP; 847 mutex_unlock(&isert_conn->mutex); 848 } 849 850 static void 851 isert_release_kref(struct kref *kref) 852 { 853 struct isert_conn *isert_conn = container_of(kref, 854 struct isert_conn, kref); 855 856 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm, 857 current->pid); 858 859 isert_connect_release(isert_conn); 860 } 861 862 static void 863 isert_put_conn(struct isert_conn *isert_conn) 864 { 865 kref_put(&isert_conn->kref, isert_release_kref); 866 } 867 868 /** 869 * isert_conn_terminate() - Initiate connection termination 870 * @isert_conn: isert connection struct 871 * 872 * Notes: 873 * In case the connection state is FULL_FEATURE, move state 874 * to TEMINATING and start teardown sequence (rdma_disconnect). 875 * In case the connection state is UP, complete flush as well. 876 * 877 * This routine must be called with mutex held. Thus it is 878 * safe to call multiple times. 879 */ 880 static void 881 isert_conn_terminate(struct isert_conn *isert_conn) 882 { 883 int err; 884 885 switch (isert_conn->state) { 886 case ISER_CONN_TERMINATING: 887 break; 888 case ISER_CONN_UP: 889 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */ 890 isert_info("Terminating conn %p state %d\n", 891 isert_conn, isert_conn->state); 892 isert_conn->state = ISER_CONN_TERMINATING; 893 err = rdma_disconnect(isert_conn->cm_id); 894 if (err) 895 isert_warn("Failed rdma_disconnect isert_conn %p\n", 896 isert_conn); 897 break; 898 default: 899 isert_warn("conn %p teminating in state %d\n", 900 isert_conn, isert_conn->state); 901 } 902 } 903 904 static int 905 isert_np_cma_handler(struct isert_np *isert_np, 906 enum rdma_cm_event_type event) 907 { 908 isert_dbg("%s (%d): isert np %p\n", 909 rdma_event_msg(event), event, isert_np); 910 911 switch (event) { 912 case RDMA_CM_EVENT_DEVICE_REMOVAL: 913 isert_np->np_cm_id = NULL; 914 break; 915 case RDMA_CM_EVENT_ADDR_CHANGE: 916 isert_np->np_cm_id = isert_setup_id(isert_np); 917 if (IS_ERR(isert_np->np_cm_id)) { 918 isert_err("isert np %p setup id failed: %ld\n", 919 isert_np, PTR_ERR(isert_np->np_cm_id)); 920 isert_np->np_cm_id = NULL; 921 } 922 break; 923 default: 924 isert_err("isert np %p Unexpected event %d\n", 925 isert_np, event); 926 } 927 928 return -1; 929 } 930 931 static int 932 isert_disconnected_handler(struct rdma_cm_id *cma_id, 933 enum rdma_cm_event_type event) 934 { 935 struct isert_np *isert_np = cma_id->context; 936 struct isert_conn *isert_conn; 937 bool terminating = false; 938 939 if (isert_np->np_cm_id == cma_id) 940 return isert_np_cma_handler(cma_id->context, event); 941 942 isert_conn = cma_id->qp->qp_context; 943 944 mutex_lock(&isert_conn->mutex); 945 terminating = (isert_conn->state == ISER_CONN_TERMINATING); 946 isert_conn_terminate(isert_conn); 947 mutex_unlock(&isert_conn->mutex); 948 949 isert_info("conn %p completing wait\n", isert_conn); 950 complete(&isert_conn->wait); 951 952 if (terminating) 953 goto out; 954 955 mutex_lock(&isert_np->np_accept_mutex); 956 if (!list_empty(&isert_conn->accept_node)) { 957 list_del_init(&isert_conn->accept_node); 958 isert_put_conn(isert_conn); 959 queue_work(isert_release_wq, &isert_conn->release_work); 960 } 961 mutex_unlock(&isert_np->np_accept_mutex); 962 963 out: 964 return 0; 965 } 966 967 static int 968 isert_connect_error(struct rdma_cm_id *cma_id) 969 { 970 struct isert_conn *isert_conn = cma_id->qp->qp_context; 971 972 isert_conn->cm_id = NULL; 973 isert_put_conn(isert_conn); 974 975 return -1; 976 } 977 978 static int 979 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) 980 { 981 int ret = 0; 982 983 isert_info("%s (%d): status %d id %p np %p\n", 984 rdma_event_msg(event->event), event->event, 985 event->status, cma_id, cma_id->context); 986 987 switch (event->event) { 988 case RDMA_CM_EVENT_CONNECT_REQUEST: 989 ret = isert_connect_request(cma_id, event); 990 if (ret) 991 isert_err("failed handle connect request %d\n", ret); 992 break; 993 case RDMA_CM_EVENT_ESTABLISHED: 994 isert_connected_handler(cma_id); 995 break; 996 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */ 997 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */ 998 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */ 999 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */ 1000 ret = isert_disconnected_handler(cma_id, event->event); 1001 break; 1002 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */ 1003 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */ 1004 case RDMA_CM_EVENT_CONNECT_ERROR: 1005 ret = isert_connect_error(cma_id); 1006 break; 1007 default: 1008 isert_err("Unhandled RDMA CMA event: %d\n", event->event); 1009 break; 1010 } 1011 1012 return ret; 1013 } 1014 1015 static int 1016 isert_post_recv(struct isert_conn *isert_conn, u32 count) 1017 { 1018 struct ib_recv_wr *rx_wr, *rx_wr_failed; 1019 int i, ret; 1020 unsigned int rx_head = isert_conn->rx_desc_head; 1021 struct iser_rx_desc *rx_desc; 1022 1023 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) { 1024 rx_desc = &isert_conn->rx_descs[rx_head]; 1025 rx_wr->wr_id = (uintptr_t)rx_desc; 1026 rx_wr->sg_list = &rx_desc->rx_sg; 1027 rx_wr->num_sge = 1; 1028 rx_wr->next = rx_wr + 1; 1029 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1); 1030 } 1031 1032 rx_wr--; 1033 rx_wr->next = NULL; /* mark end of work requests list */ 1034 1035 isert_conn->post_recv_buf_count += count; 1036 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, 1037 &rx_wr_failed); 1038 if (ret) { 1039 isert_err("ib_post_recv() failed with ret: %d\n", ret); 1040 isert_conn->post_recv_buf_count -= count; 1041 } else { 1042 isert_dbg("Posted %d RX buffers\n", count); 1043 isert_conn->rx_desc_head = rx_head; 1044 } 1045 return ret; 1046 } 1047 1048 static int 1049 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc) 1050 { 1051 struct ib_device *ib_dev = isert_conn->cm_id->device; 1052 struct ib_send_wr send_wr, *send_wr_failed; 1053 int ret; 1054 1055 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr, 1056 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1057 1058 send_wr.next = NULL; 1059 send_wr.wr_id = (uintptr_t)tx_desc; 1060 send_wr.sg_list = tx_desc->tx_sg; 1061 send_wr.num_sge = tx_desc->num_sge; 1062 send_wr.opcode = IB_WR_SEND; 1063 send_wr.send_flags = IB_SEND_SIGNALED; 1064 1065 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed); 1066 if (ret) 1067 isert_err("ib_post_send() failed, ret: %d\n", ret); 1068 1069 return ret; 1070 } 1071 1072 static void 1073 isert_create_send_desc(struct isert_conn *isert_conn, 1074 struct isert_cmd *isert_cmd, 1075 struct iser_tx_desc *tx_desc) 1076 { 1077 struct isert_device *device = isert_conn->device; 1078 struct ib_device *ib_dev = device->ib_device; 1079 1080 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr, 1081 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1082 1083 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr)); 1084 tx_desc->iser_header.flags = ISER_VER; 1085 1086 tx_desc->num_sge = 1; 1087 tx_desc->isert_cmd = isert_cmd; 1088 1089 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) { 1090 tx_desc->tx_sg[0].lkey = device->mr->lkey; 1091 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc); 1092 } 1093 } 1094 1095 static int 1096 isert_init_tx_hdrs(struct isert_conn *isert_conn, 1097 struct iser_tx_desc *tx_desc) 1098 { 1099 struct isert_device *device = isert_conn->device; 1100 struct ib_device *ib_dev = device->ib_device; 1101 u64 dma_addr; 1102 1103 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc, 1104 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1105 if (ib_dma_mapping_error(ib_dev, dma_addr)) { 1106 isert_err("ib_dma_mapping_error() failed\n"); 1107 return -ENOMEM; 1108 } 1109 1110 tx_desc->dma_addr = dma_addr; 1111 tx_desc->tx_sg[0].addr = tx_desc->dma_addr; 1112 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; 1113 tx_desc->tx_sg[0].lkey = device->mr->lkey; 1114 1115 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n", 1116 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length, 1117 tx_desc->tx_sg[0].lkey); 1118 1119 return 0; 1120 } 1121 1122 static void 1123 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1124 struct ib_send_wr *send_wr) 1125 { 1126 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc; 1127 1128 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND; 1129 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 1130 send_wr->opcode = IB_WR_SEND; 1131 send_wr->sg_list = &tx_desc->tx_sg[0]; 1132 send_wr->num_sge = isert_cmd->tx_desc.num_sge; 1133 send_wr->send_flags = IB_SEND_SIGNALED; 1134 } 1135 1136 static int 1137 isert_rdma_post_recvl(struct isert_conn *isert_conn) 1138 { 1139 struct ib_recv_wr rx_wr, *rx_wr_fail; 1140 struct ib_sge sge; 1141 int ret; 1142 1143 memset(&sge, 0, sizeof(struct ib_sge)); 1144 sge.addr = isert_conn->login_req_dma; 1145 sge.length = ISER_RX_LOGIN_SIZE; 1146 sge.lkey = isert_conn->device->mr->lkey; 1147 1148 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n", 1149 sge.addr, sge.length, sge.lkey); 1150 1151 memset(&rx_wr, 0, sizeof(struct ib_recv_wr)); 1152 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf; 1153 rx_wr.sg_list = &sge; 1154 rx_wr.num_sge = 1; 1155 1156 isert_conn->post_recv_buf_count++; 1157 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail); 1158 if (ret) { 1159 isert_err("ib_post_recv() failed: %d\n", ret); 1160 isert_conn->post_recv_buf_count--; 1161 } 1162 1163 return ret; 1164 } 1165 1166 static int 1167 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 1168 u32 length) 1169 { 1170 struct isert_conn *isert_conn = conn->context; 1171 struct isert_device *device = isert_conn->device; 1172 struct ib_device *ib_dev = device->ib_device; 1173 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc; 1174 int ret; 1175 1176 isert_create_send_desc(isert_conn, NULL, tx_desc); 1177 1178 memcpy(&tx_desc->iscsi_header, &login->rsp[0], 1179 sizeof(struct iscsi_hdr)); 1180 1181 isert_init_tx_hdrs(isert_conn, tx_desc); 1182 1183 if (length > 0) { 1184 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1]; 1185 1186 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma, 1187 length, DMA_TO_DEVICE); 1188 1189 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length); 1190 1191 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma, 1192 length, DMA_TO_DEVICE); 1193 1194 tx_dsg->addr = isert_conn->login_rsp_dma; 1195 tx_dsg->length = length; 1196 tx_dsg->lkey = isert_conn->device->mr->lkey; 1197 tx_desc->num_sge = 2; 1198 } 1199 if (!login->login_failed) { 1200 if (login->login_complete) { 1201 if (!conn->sess->sess_ops->SessionType && 1202 isert_conn->device->use_fastreg) { 1203 ret = isert_conn_create_fastreg_pool(isert_conn); 1204 if (ret) { 1205 isert_err("Conn: %p failed to create" 1206 " fastreg pool\n", isert_conn); 1207 return ret; 1208 } 1209 } 1210 1211 ret = isert_alloc_rx_descriptors(isert_conn); 1212 if (ret) 1213 return ret; 1214 1215 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX); 1216 if (ret) 1217 return ret; 1218 1219 /* Now we are in FULL_FEATURE phase */ 1220 mutex_lock(&isert_conn->mutex); 1221 isert_conn->state = ISER_CONN_FULL_FEATURE; 1222 mutex_unlock(&isert_conn->mutex); 1223 goto post_send; 1224 } 1225 1226 ret = isert_rdma_post_recvl(isert_conn); 1227 if (ret) 1228 return ret; 1229 } 1230 post_send: 1231 ret = isert_post_send(isert_conn, tx_desc); 1232 if (ret) 1233 return ret; 1234 1235 return 0; 1236 } 1237 1238 static void 1239 isert_rx_login_req(struct isert_conn *isert_conn) 1240 { 1241 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf; 1242 int rx_buflen = isert_conn->login_req_len; 1243 struct iscsi_conn *conn = isert_conn->conn; 1244 struct iscsi_login *login = conn->conn_login; 1245 int size; 1246 1247 isert_info("conn %p\n", isert_conn); 1248 1249 WARN_ON_ONCE(!login); 1250 1251 if (login->first_request) { 1252 struct iscsi_login_req *login_req = 1253 (struct iscsi_login_req *)&rx_desc->iscsi_header; 1254 /* 1255 * Setup the initial iscsi_login values from the leading 1256 * login request PDU. 1257 */ 1258 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1259 login->current_stage = 1260 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) 1261 >> 2; 1262 login->version_min = login_req->min_version; 1263 login->version_max = login_req->max_version; 1264 memcpy(login->isid, login_req->isid, 6); 1265 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1266 login->init_task_tag = login_req->itt; 1267 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1268 login->cid = be16_to_cpu(login_req->cid); 1269 login->tsih = be16_to_cpu(login_req->tsih); 1270 } 1271 1272 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN); 1273 1274 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS); 1275 isert_dbg("Using login payload size: %d, rx_buflen: %d " 1276 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen, 1277 MAX_KEY_VALUE_PAIRS); 1278 memcpy(login->req_buf, &rx_desc->data[0], size); 1279 1280 if (login->first_request) { 1281 complete(&isert_conn->login_comp); 1282 return; 1283 } 1284 schedule_delayed_work(&conn->login_work, 0); 1285 } 1286 1287 static struct iscsi_cmd 1288 *isert_allocate_cmd(struct iscsi_conn *conn) 1289 { 1290 struct isert_conn *isert_conn = conn->context; 1291 struct isert_cmd *isert_cmd; 1292 struct iscsi_cmd *cmd; 1293 1294 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 1295 if (!cmd) { 1296 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n"); 1297 return NULL; 1298 } 1299 isert_cmd = iscsit_priv_cmd(cmd); 1300 isert_cmd->conn = isert_conn; 1301 isert_cmd->iscsi_cmd = cmd; 1302 1303 return cmd; 1304 } 1305 1306 static int 1307 isert_handle_scsi_cmd(struct isert_conn *isert_conn, 1308 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd, 1309 struct iser_rx_desc *rx_desc, unsigned char *buf) 1310 { 1311 struct iscsi_conn *conn = isert_conn->conn; 1312 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1313 struct scatterlist *sg; 1314 int imm_data, imm_data_len, unsol_data, sg_nents, rc; 1315 bool dump_payload = false; 1316 1317 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1318 if (rc < 0) 1319 return rc; 1320 1321 imm_data = cmd->immediate_data; 1322 imm_data_len = cmd->first_burst_len; 1323 unsol_data = cmd->unsolicited_data; 1324 1325 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1326 if (rc < 0) { 1327 return 0; 1328 } else if (rc > 0) { 1329 dump_payload = true; 1330 goto sequence_cmd; 1331 } 1332 1333 if (!imm_data) 1334 return 0; 1335 1336 sg = &cmd->se_cmd.t_data_sg[0]; 1337 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE)); 1338 1339 isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n", 1340 sg, sg_nents, &rx_desc->data[0], imm_data_len); 1341 1342 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len); 1343 1344 cmd->write_data_done += imm_data_len; 1345 1346 if (cmd->write_data_done == cmd->se_cmd.data_length) { 1347 spin_lock_bh(&cmd->istate_lock); 1348 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1349 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1350 spin_unlock_bh(&cmd->istate_lock); 1351 } 1352 1353 sequence_cmd: 1354 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1355 1356 if (!rc && dump_payload == false && unsol_data) 1357 iscsit_set_unsoliticed_dataout(cmd); 1358 else if (dump_payload && imm_data) 1359 target_put_sess_cmd(&cmd->se_cmd); 1360 1361 return 0; 1362 } 1363 1364 static int 1365 isert_handle_iscsi_dataout(struct isert_conn *isert_conn, 1366 struct iser_rx_desc *rx_desc, unsigned char *buf) 1367 { 1368 struct scatterlist *sg_start; 1369 struct iscsi_conn *conn = isert_conn->conn; 1370 struct iscsi_cmd *cmd = NULL; 1371 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1372 u32 unsol_data_len = ntoh24(hdr->dlength); 1373 int rc, sg_nents, sg_off, page_off; 1374 1375 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1376 if (rc < 0) 1377 return rc; 1378 else if (!cmd) 1379 return 0; 1380 /* 1381 * FIXME: Unexpected unsolicited_data out 1382 */ 1383 if (!cmd->unsolicited_data) { 1384 isert_err("Received unexpected solicited data payload\n"); 1385 dump_stack(); 1386 return -1; 1387 } 1388 1389 isert_dbg("Unsolicited DataOut unsol_data_len: %u, " 1390 "write_data_done: %u, data_length: %u\n", 1391 unsol_data_len, cmd->write_data_done, 1392 cmd->se_cmd.data_length); 1393 1394 sg_off = cmd->write_data_done / PAGE_SIZE; 1395 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 1396 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE)); 1397 page_off = cmd->write_data_done % PAGE_SIZE; 1398 /* 1399 * FIXME: Non page-aligned unsolicited_data out 1400 */ 1401 if (page_off) { 1402 isert_err("unexpected non-page aligned data payload\n"); 1403 dump_stack(); 1404 return -1; 1405 } 1406 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u " 1407 "sg_nents: %u from %p %u\n", sg_start, sg_off, 1408 sg_nents, &rx_desc->data[0], unsol_data_len); 1409 1410 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0], 1411 unsol_data_len); 1412 1413 rc = iscsit_check_dataout_payload(cmd, hdr, false); 1414 if (rc < 0) 1415 return rc; 1416 1417 return 0; 1418 } 1419 1420 static int 1421 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1422 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1423 unsigned char *buf) 1424 { 1425 struct iscsi_conn *conn = isert_conn->conn; 1426 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1427 int rc; 1428 1429 rc = iscsit_setup_nop_out(conn, cmd, hdr); 1430 if (rc < 0) 1431 return rc; 1432 /* 1433 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload 1434 */ 1435 1436 return iscsit_process_nop_out(conn, cmd, hdr); 1437 } 1438 1439 static int 1440 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1441 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc, 1442 struct iscsi_text *hdr) 1443 { 1444 struct iscsi_conn *conn = isert_conn->conn; 1445 u32 payload_length = ntoh24(hdr->dlength); 1446 int rc; 1447 unsigned char *text_in = NULL; 1448 1449 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 1450 if (rc < 0) 1451 return rc; 1452 1453 if (payload_length) { 1454 text_in = kzalloc(payload_length, GFP_KERNEL); 1455 if (!text_in) { 1456 isert_err("Unable to allocate text_in of payload_length: %u\n", 1457 payload_length); 1458 return -ENOMEM; 1459 } 1460 } 1461 cmd->text_in_ptr = text_in; 1462 1463 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length); 1464 1465 return iscsit_process_text_cmd(conn, cmd, hdr); 1466 } 1467 1468 static int 1469 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc, 1470 uint32_t read_stag, uint64_t read_va, 1471 uint32_t write_stag, uint64_t write_va) 1472 { 1473 struct iscsi_hdr *hdr = &rx_desc->iscsi_header; 1474 struct iscsi_conn *conn = isert_conn->conn; 1475 struct iscsi_cmd *cmd; 1476 struct isert_cmd *isert_cmd; 1477 int ret = -EINVAL; 1478 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK); 1479 1480 if (conn->sess->sess_ops->SessionType && 1481 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) { 1482 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery," 1483 " ignoring\n", opcode); 1484 return 0; 1485 } 1486 1487 switch (opcode) { 1488 case ISCSI_OP_SCSI_CMD: 1489 cmd = isert_allocate_cmd(conn); 1490 if (!cmd) 1491 break; 1492 1493 isert_cmd = iscsit_priv_cmd(cmd); 1494 isert_cmd->read_stag = read_stag; 1495 isert_cmd->read_va = read_va; 1496 isert_cmd->write_stag = write_stag; 1497 isert_cmd->write_va = write_va; 1498 1499 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd, 1500 rx_desc, (unsigned char *)hdr); 1501 break; 1502 case ISCSI_OP_NOOP_OUT: 1503 cmd = isert_allocate_cmd(conn); 1504 if (!cmd) 1505 break; 1506 1507 isert_cmd = iscsit_priv_cmd(cmd); 1508 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd, 1509 rx_desc, (unsigned char *)hdr); 1510 break; 1511 case ISCSI_OP_SCSI_DATA_OUT: 1512 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc, 1513 (unsigned char *)hdr); 1514 break; 1515 case ISCSI_OP_SCSI_TMFUNC: 1516 cmd = isert_allocate_cmd(conn); 1517 if (!cmd) 1518 break; 1519 1520 ret = iscsit_handle_task_mgt_cmd(conn, cmd, 1521 (unsigned char *)hdr); 1522 break; 1523 case ISCSI_OP_LOGOUT: 1524 cmd = isert_allocate_cmd(conn); 1525 if (!cmd) 1526 break; 1527 1528 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr); 1529 break; 1530 case ISCSI_OP_TEXT: 1531 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) { 1532 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 1533 if (!cmd) 1534 break; 1535 } else { 1536 cmd = isert_allocate_cmd(conn); 1537 if (!cmd) 1538 break; 1539 } 1540 1541 isert_cmd = iscsit_priv_cmd(cmd); 1542 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd, 1543 rx_desc, (struct iscsi_text *)hdr); 1544 break; 1545 default: 1546 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode); 1547 dump_stack(); 1548 break; 1549 } 1550 1551 return ret; 1552 } 1553 1554 static void 1555 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn) 1556 { 1557 struct iser_hdr *iser_hdr = &rx_desc->iser_header; 1558 uint64_t read_va = 0, write_va = 0; 1559 uint32_t read_stag = 0, write_stag = 0; 1560 int rc; 1561 1562 switch (iser_hdr->flags & 0xF0) { 1563 case ISCSI_CTRL: 1564 if (iser_hdr->flags & ISER_RSV) { 1565 read_stag = be32_to_cpu(iser_hdr->read_stag); 1566 read_va = be64_to_cpu(iser_hdr->read_va); 1567 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n", 1568 read_stag, (unsigned long long)read_va); 1569 } 1570 if (iser_hdr->flags & ISER_WSV) { 1571 write_stag = be32_to_cpu(iser_hdr->write_stag); 1572 write_va = be64_to_cpu(iser_hdr->write_va); 1573 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n", 1574 write_stag, (unsigned long long)write_va); 1575 } 1576 1577 isert_dbg("ISER ISCSI_CTRL PDU\n"); 1578 break; 1579 case ISER_HELLO: 1580 isert_err("iSER Hello message\n"); 1581 break; 1582 default: 1583 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags); 1584 break; 1585 } 1586 1587 rc = isert_rx_opcode(isert_conn, rx_desc, 1588 read_stag, read_va, write_stag, write_va); 1589 } 1590 1591 static void 1592 isert_rcv_completion(struct iser_rx_desc *desc, 1593 struct isert_conn *isert_conn, 1594 u32 xfer_len) 1595 { 1596 struct ib_device *ib_dev = isert_conn->cm_id->device; 1597 struct iscsi_hdr *hdr; 1598 u64 rx_dma; 1599 int rx_buflen, outstanding; 1600 1601 if ((char *)desc == isert_conn->login_req_buf) { 1602 rx_dma = isert_conn->login_req_dma; 1603 rx_buflen = ISER_RX_LOGIN_SIZE; 1604 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", 1605 rx_dma, rx_buflen); 1606 } else { 1607 rx_dma = desc->dma_addr; 1608 rx_buflen = ISER_RX_PAYLOAD_SIZE; 1609 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n", 1610 rx_dma, rx_buflen); 1611 } 1612 1613 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE); 1614 1615 hdr = &desc->iscsi_header; 1616 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n", 1617 hdr->opcode, hdr->itt, hdr->flags, 1618 (int)(xfer_len - ISER_HEADERS_LEN)); 1619 1620 if ((char *)desc == isert_conn->login_req_buf) { 1621 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN; 1622 if (isert_conn->conn) { 1623 struct iscsi_login *login = isert_conn->conn->conn_login; 1624 1625 if (login && !login->first_request) 1626 isert_rx_login_req(isert_conn); 1627 } 1628 mutex_lock(&isert_conn->mutex); 1629 complete(&isert_conn->login_req_comp); 1630 mutex_unlock(&isert_conn->mutex); 1631 } else { 1632 isert_rx_do_work(desc, isert_conn); 1633 } 1634 1635 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen, 1636 DMA_FROM_DEVICE); 1637 1638 isert_conn->post_recv_buf_count--; 1639 isert_dbg("Decremented post_recv_buf_count: %d\n", 1640 isert_conn->post_recv_buf_count); 1641 1642 if ((char *)desc == isert_conn->login_req_buf) 1643 return; 1644 1645 outstanding = isert_conn->post_recv_buf_count; 1646 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) { 1647 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding, 1648 ISERT_MIN_POSTED_RX); 1649 err = isert_post_recv(isert_conn, count); 1650 if (err) { 1651 isert_err("isert_post_recv() count: %d failed, %d\n", 1652 count, err); 1653 } 1654 } 1655 } 1656 1657 static int 1658 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 1659 struct scatterlist *sg, u32 nents, u32 length, u32 offset, 1660 enum iser_ib_op_code op, struct isert_data_buf *data) 1661 { 1662 struct ib_device *ib_dev = isert_conn->cm_id->device; 1663 1664 data->dma_dir = op == ISER_IB_RDMA_WRITE ? 1665 DMA_TO_DEVICE : DMA_FROM_DEVICE; 1666 1667 data->len = length - offset; 1668 data->offset = offset; 1669 data->sg_off = data->offset / PAGE_SIZE; 1670 1671 data->sg = &sg[data->sg_off]; 1672 data->nents = min_t(unsigned int, nents - data->sg_off, 1673 ISCSI_ISER_SG_TABLESIZE); 1674 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE * 1675 PAGE_SIZE); 1676 1677 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents, 1678 data->dma_dir); 1679 if (unlikely(!data->dma_nents)) { 1680 isert_err("Cmd: unable to dma map SGs %p\n", sg); 1681 return -EINVAL; 1682 } 1683 1684 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n", 1685 isert_cmd, data->dma_nents, data->sg, data->nents, data->len); 1686 1687 return 0; 1688 } 1689 1690 static void 1691 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data) 1692 { 1693 struct ib_device *ib_dev = isert_conn->cm_id->device; 1694 1695 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir); 1696 memset(data, 0, sizeof(*data)); 1697 } 1698 1699 1700 1701 static void 1702 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) 1703 { 1704 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1705 1706 isert_dbg("Cmd %p\n", isert_cmd); 1707 1708 if (wr->data.sg) { 1709 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); 1710 isert_unmap_data_buf(isert_conn, &wr->data); 1711 } 1712 1713 if (wr->send_wr) { 1714 isert_dbg("Cmd %p free send_wr\n", isert_cmd); 1715 kfree(wr->send_wr); 1716 wr->send_wr = NULL; 1717 } 1718 1719 if (wr->ib_sge) { 1720 isert_dbg("Cmd %p free ib_sge\n", isert_cmd); 1721 kfree(wr->ib_sge); 1722 wr->ib_sge = NULL; 1723 } 1724 } 1725 1726 static void 1727 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn) 1728 { 1729 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1730 1731 isert_dbg("Cmd %p\n", isert_cmd); 1732 1733 if (wr->fr_desc) { 1734 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc); 1735 if (wr->fr_desc->ind & ISERT_PROTECTED) { 1736 isert_unmap_data_buf(isert_conn, &wr->prot); 1737 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1738 } 1739 spin_lock_bh(&isert_conn->pool_lock); 1740 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool); 1741 spin_unlock_bh(&isert_conn->pool_lock); 1742 wr->fr_desc = NULL; 1743 } 1744 1745 if (wr->data.sg) { 1746 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd); 1747 isert_unmap_data_buf(isert_conn, &wr->data); 1748 } 1749 1750 wr->ib_sge = NULL; 1751 wr->send_wr = NULL; 1752 } 1753 1754 static void 1755 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err) 1756 { 1757 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1758 struct isert_conn *isert_conn = isert_cmd->conn; 1759 struct iscsi_conn *conn = isert_conn->conn; 1760 struct isert_device *device = isert_conn->device; 1761 struct iscsi_text_rsp *hdr; 1762 1763 isert_dbg("Cmd %p\n", isert_cmd); 1764 1765 switch (cmd->iscsi_opcode) { 1766 case ISCSI_OP_SCSI_CMD: 1767 spin_lock_bh(&conn->cmd_lock); 1768 if (!list_empty(&cmd->i_conn_node)) 1769 list_del_init(&cmd->i_conn_node); 1770 spin_unlock_bh(&conn->cmd_lock); 1771 1772 if (cmd->data_direction == DMA_TO_DEVICE) { 1773 iscsit_stop_dataout_timer(cmd); 1774 /* 1775 * Check for special case during comp_err where 1776 * WRITE_PENDING has been handed off from core, 1777 * but requires an extra target_put_sess_cmd() 1778 * before transport_generic_free_cmd() below. 1779 */ 1780 if (comp_err && 1781 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 1782 struct se_cmd *se_cmd = &cmd->se_cmd; 1783 1784 target_put_sess_cmd(se_cmd); 1785 } 1786 } 1787 1788 device->unreg_rdma_mem(isert_cmd, isert_conn); 1789 transport_generic_free_cmd(&cmd->se_cmd, 0); 1790 break; 1791 case ISCSI_OP_SCSI_TMFUNC: 1792 spin_lock_bh(&conn->cmd_lock); 1793 if (!list_empty(&cmd->i_conn_node)) 1794 list_del_init(&cmd->i_conn_node); 1795 spin_unlock_bh(&conn->cmd_lock); 1796 1797 transport_generic_free_cmd(&cmd->se_cmd, 0); 1798 break; 1799 case ISCSI_OP_REJECT: 1800 case ISCSI_OP_NOOP_OUT: 1801 case ISCSI_OP_TEXT: 1802 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 1803 /* If the continue bit is on, keep the command alive */ 1804 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE) 1805 break; 1806 1807 spin_lock_bh(&conn->cmd_lock); 1808 if (!list_empty(&cmd->i_conn_node)) 1809 list_del_init(&cmd->i_conn_node); 1810 spin_unlock_bh(&conn->cmd_lock); 1811 1812 /* 1813 * Handle special case for REJECT when iscsi_add_reject*() has 1814 * overwritten the original iscsi_opcode assignment, and the 1815 * associated cmd->se_cmd needs to be released. 1816 */ 1817 if (cmd->se_cmd.se_tfo != NULL) { 1818 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n", 1819 cmd->iscsi_opcode); 1820 transport_generic_free_cmd(&cmd->se_cmd, 0); 1821 break; 1822 } 1823 /* 1824 * Fall-through 1825 */ 1826 default: 1827 iscsit_release_cmd(cmd); 1828 break; 1829 } 1830 } 1831 1832 static void 1833 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev) 1834 { 1835 if (tx_desc->dma_addr != 0) { 1836 isert_dbg("unmap single for tx_desc->dma_addr\n"); 1837 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr, 1838 ISER_HEADERS_LEN, DMA_TO_DEVICE); 1839 tx_desc->dma_addr = 0; 1840 } 1841 } 1842 1843 static void 1844 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd, 1845 struct ib_device *ib_dev, bool comp_err) 1846 { 1847 if (isert_cmd->pdu_buf_dma != 0) { 1848 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n"); 1849 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma, 1850 isert_cmd->pdu_buf_len, DMA_TO_DEVICE); 1851 isert_cmd->pdu_buf_dma = 0; 1852 } 1853 1854 isert_unmap_tx_desc(tx_desc, ib_dev); 1855 isert_put_cmd(isert_cmd, comp_err); 1856 } 1857 1858 static int 1859 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr) 1860 { 1861 struct ib_mr_status mr_status; 1862 int ret; 1863 1864 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status); 1865 if (ret) { 1866 isert_err("ib_check_mr_status failed, ret %d\n", ret); 1867 goto fail_mr_status; 1868 } 1869 1870 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) { 1871 u64 sec_offset_err; 1872 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8; 1873 1874 switch (mr_status.sig_err.err_type) { 1875 case IB_SIG_BAD_GUARD: 1876 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 1877 break; 1878 case IB_SIG_BAD_REFTAG: 1879 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 1880 break; 1881 case IB_SIG_BAD_APPTAG: 1882 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED; 1883 break; 1884 } 1885 sec_offset_err = mr_status.sig_err.sig_err_offset; 1886 do_div(sec_offset_err, block_size); 1887 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba; 1888 1889 isert_err("PI error found type %d at sector 0x%llx " 1890 "expected 0x%x vs actual 0x%x\n", 1891 mr_status.sig_err.err_type, 1892 (unsigned long long)se_cmd->bad_sector, 1893 mr_status.sig_err.expected, 1894 mr_status.sig_err.actual); 1895 ret = 1; 1896 } 1897 1898 fail_mr_status: 1899 return ret; 1900 } 1901 1902 static void 1903 isert_completion_rdma_write(struct iser_tx_desc *tx_desc, 1904 struct isert_cmd *isert_cmd) 1905 { 1906 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1907 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1908 struct se_cmd *se_cmd = &cmd->se_cmd; 1909 struct isert_conn *isert_conn = isert_cmd->conn; 1910 struct isert_device *device = isert_conn->device; 1911 int ret = 0; 1912 1913 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { 1914 ret = isert_check_pi_status(se_cmd, 1915 wr->fr_desc->pi_ctx->sig_mr); 1916 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1917 } 1918 1919 device->unreg_rdma_mem(isert_cmd, isert_conn); 1920 wr->send_wr_num = 0; 1921 if (ret) 1922 transport_send_check_condition_and_sense(se_cmd, 1923 se_cmd->pi_err, 0); 1924 else 1925 isert_put_response(isert_conn->conn, cmd); 1926 } 1927 1928 static void 1929 isert_completion_rdma_read(struct iser_tx_desc *tx_desc, 1930 struct isert_cmd *isert_cmd) 1931 { 1932 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 1933 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1934 struct se_cmd *se_cmd = &cmd->se_cmd; 1935 struct isert_conn *isert_conn = isert_cmd->conn; 1936 struct isert_device *device = isert_conn->device; 1937 int ret = 0; 1938 1939 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) { 1940 ret = isert_check_pi_status(se_cmd, 1941 wr->fr_desc->pi_ctx->sig_mr); 1942 wr->fr_desc->ind &= ~ISERT_PROTECTED; 1943 } 1944 1945 iscsit_stop_dataout_timer(cmd); 1946 device->unreg_rdma_mem(isert_cmd, isert_conn); 1947 cmd->write_data_done = wr->data.len; 1948 wr->send_wr_num = 0; 1949 1950 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd); 1951 spin_lock_bh(&cmd->istate_lock); 1952 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1953 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1954 spin_unlock_bh(&cmd->istate_lock); 1955 1956 if (ret) { 1957 target_put_sess_cmd(se_cmd); 1958 transport_send_check_condition_and_sense(se_cmd, 1959 se_cmd->pi_err, 0); 1960 } else { 1961 target_execute_cmd(se_cmd); 1962 } 1963 } 1964 1965 static void 1966 isert_do_control_comp(struct work_struct *work) 1967 { 1968 struct isert_cmd *isert_cmd = container_of(work, 1969 struct isert_cmd, comp_work); 1970 struct isert_conn *isert_conn = isert_cmd->conn; 1971 struct ib_device *ib_dev = isert_conn->cm_id->device; 1972 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 1973 1974 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state); 1975 1976 switch (cmd->i_state) { 1977 case ISTATE_SEND_TASKMGTRSP: 1978 iscsit_tmr_post_handler(cmd, cmd->conn); 1979 case ISTATE_SEND_REJECT: /* FALLTHRU */ 1980 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */ 1981 cmd->i_state = ISTATE_SENT_STATUS; 1982 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, 1983 ib_dev, false); 1984 break; 1985 case ISTATE_SEND_LOGOUTRSP: 1986 iscsit_logout_post_handler(cmd, cmd->conn); 1987 break; 1988 default: 1989 isert_err("Unknown i_state %d\n", cmd->i_state); 1990 dump_stack(); 1991 break; 1992 } 1993 } 1994 1995 static void 1996 isert_response_completion(struct iser_tx_desc *tx_desc, 1997 struct isert_cmd *isert_cmd, 1998 struct isert_conn *isert_conn, 1999 struct ib_device *ib_dev) 2000 { 2001 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 2002 2003 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP || 2004 cmd->i_state == ISTATE_SEND_LOGOUTRSP || 2005 cmd->i_state == ISTATE_SEND_REJECT || 2006 cmd->i_state == ISTATE_SEND_TEXTRSP) { 2007 isert_unmap_tx_desc(tx_desc, ib_dev); 2008 2009 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp); 2010 queue_work(isert_comp_wq, &isert_cmd->comp_work); 2011 return; 2012 } 2013 2014 cmd->i_state = ISTATE_SENT_STATUS; 2015 isert_completion_put(tx_desc, isert_cmd, ib_dev, false); 2016 } 2017 2018 static void 2019 isert_snd_completion(struct iser_tx_desc *tx_desc, 2020 struct isert_conn *isert_conn) 2021 { 2022 struct ib_device *ib_dev = isert_conn->cm_id->device; 2023 struct isert_cmd *isert_cmd = tx_desc->isert_cmd; 2024 struct isert_rdma_wr *wr; 2025 2026 if (!isert_cmd) { 2027 isert_unmap_tx_desc(tx_desc, ib_dev); 2028 return; 2029 } 2030 wr = &isert_cmd->rdma_wr; 2031 2032 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op); 2033 2034 switch (wr->iser_ib_op) { 2035 case ISER_IB_SEND: 2036 isert_response_completion(tx_desc, isert_cmd, 2037 isert_conn, ib_dev); 2038 break; 2039 case ISER_IB_RDMA_WRITE: 2040 isert_completion_rdma_write(tx_desc, isert_cmd); 2041 break; 2042 case ISER_IB_RDMA_READ: 2043 isert_completion_rdma_read(tx_desc, isert_cmd); 2044 break; 2045 default: 2046 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op); 2047 dump_stack(); 2048 break; 2049 } 2050 } 2051 2052 /** 2053 * is_isert_tx_desc() - Indicate if the completion wr_id 2054 * is a TX descriptor or not. 2055 * @isert_conn: iser connection 2056 * @wr_id: completion WR identifier 2057 * 2058 * Since we cannot rely on wc opcode in FLUSH errors 2059 * we must work around it by checking if the wr_id address 2060 * falls in the iser connection rx_descs buffer. If so 2061 * it is an RX descriptor, otherwize it is a TX. 2062 */ 2063 static inline bool 2064 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id) 2065 { 2066 void *start = isert_conn->rx_descs; 2067 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs); 2068 2069 if (wr_id >= start && wr_id < start + len) 2070 return false; 2071 2072 return true; 2073 } 2074 2075 static void 2076 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc) 2077 { 2078 if (wc->wr_id == ISER_BEACON_WRID) { 2079 isert_info("conn %p completing wait_comp_err\n", 2080 isert_conn); 2081 complete(&isert_conn->wait_comp_err); 2082 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) { 2083 struct ib_device *ib_dev = isert_conn->cm_id->device; 2084 struct isert_cmd *isert_cmd; 2085 struct iser_tx_desc *desc; 2086 2087 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; 2088 isert_cmd = desc->isert_cmd; 2089 if (!isert_cmd) 2090 isert_unmap_tx_desc(desc, ib_dev); 2091 else 2092 isert_completion_put(desc, isert_cmd, ib_dev, true); 2093 } else { 2094 isert_conn->post_recv_buf_count--; 2095 if (!isert_conn->post_recv_buf_count) 2096 iscsit_cause_connection_reinstatement(isert_conn->conn, 0); 2097 } 2098 } 2099 2100 static void 2101 isert_handle_wc(struct ib_wc *wc) 2102 { 2103 struct isert_conn *isert_conn; 2104 struct iser_tx_desc *tx_desc; 2105 struct iser_rx_desc *rx_desc; 2106 2107 isert_conn = wc->qp->qp_context; 2108 if (likely(wc->status == IB_WC_SUCCESS)) { 2109 if (wc->opcode == IB_WC_RECV) { 2110 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id; 2111 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len); 2112 } else { 2113 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id; 2114 isert_snd_completion(tx_desc, isert_conn); 2115 } 2116 } else { 2117 if (wc->status != IB_WC_WR_FLUSH_ERR) 2118 isert_err("%s (%d): wr id %llx vend_err %x\n", 2119 ib_wc_status_msg(wc->status), wc->status, 2120 wc->wr_id, wc->vendor_err); 2121 else 2122 isert_dbg("%s (%d): wr id %llx\n", 2123 ib_wc_status_msg(wc->status), wc->status, 2124 wc->wr_id); 2125 2126 if (wc->wr_id != ISER_FASTREG_LI_WRID) 2127 isert_cq_comp_err(isert_conn, wc); 2128 } 2129 } 2130 2131 static void 2132 isert_cq_work(struct work_struct *work) 2133 { 2134 enum { isert_poll_budget = 65536 }; 2135 struct isert_comp *comp = container_of(work, struct isert_comp, 2136 work); 2137 struct ib_wc *const wcs = comp->wcs; 2138 int i, n, completed = 0; 2139 2140 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) { 2141 for (i = 0; i < n; i++) 2142 isert_handle_wc(&wcs[i]); 2143 2144 completed += n; 2145 if (completed >= isert_poll_budget) 2146 break; 2147 } 2148 2149 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP); 2150 } 2151 2152 static void 2153 isert_cq_callback(struct ib_cq *cq, void *context) 2154 { 2155 struct isert_comp *comp = context; 2156 2157 queue_work(isert_comp_wq, &comp->work); 2158 } 2159 2160 static int 2161 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd) 2162 { 2163 struct ib_send_wr *wr_failed; 2164 int ret; 2165 2166 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, 2167 &wr_failed); 2168 if (ret) { 2169 isert_err("ib_post_send failed with %d\n", ret); 2170 return ret; 2171 } 2172 return ret; 2173 } 2174 2175 static int 2176 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2177 { 2178 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2179 struct isert_conn *isert_conn = conn->context; 2180 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2181 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *) 2182 &isert_cmd->tx_desc.iscsi_header; 2183 2184 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2185 iscsit_build_rsp_pdu(cmd, conn, true, hdr); 2186 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2187 /* 2188 * Attach SENSE DATA payload to iSCSI Response PDU 2189 */ 2190 if (cmd->se_cmd.sense_buffer && 2191 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 2192 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 2193 struct isert_device *device = isert_conn->device; 2194 struct ib_device *ib_dev = device->ib_device; 2195 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2196 u32 padding, pdu_len; 2197 2198 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, 2199 cmd->sense_buffer); 2200 cmd->se_cmd.scsi_sense_length += sizeof(__be16); 2201 2202 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 2203 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 2204 pdu_len = cmd->se_cmd.scsi_sense_length + padding; 2205 2206 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2207 (void *)cmd->sense_buffer, pdu_len, 2208 DMA_TO_DEVICE); 2209 2210 isert_cmd->pdu_buf_len = pdu_len; 2211 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2212 tx_dsg->length = pdu_len; 2213 tx_dsg->lkey = device->mr->lkey; 2214 isert_cmd->tx_desc.num_sge = 2; 2215 } 2216 2217 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2218 2219 isert_dbg("Posting SCSI Response\n"); 2220 2221 return isert_post_response(isert_conn, isert_cmd); 2222 } 2223 2224 static void 2225 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2226 { 2227 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2228 struct isert_conn *isert_conn = conn->context; 2229 struct isert_device *device = isert_conn->device; 2230 2231 spin_lock_bh(&conn->cmd_lock); 2232 if (!list_empty(&cmd->i_conn_node)) 2233 list_del_init(&cmd->i_conn_node); 2234 spin_unlock_bh(&conn->cmd_lock); 2235 2236 if (cmd->data_direction == DMA_TO_DEVICE) 2237 iscsit_stop_dataout_timer(cmd); 2238 2239 device->unreg_rdma_mem(isert_cmd, isert_conn); 2240 } 2241 2242 static enum target_prot_op 2243 isert_get_sup_prot_ops(struct iscsi_conn *conn) 2244 { 2245 struct isert_conn *isert_conn = conn->context; 2246 struct isert_device *device = isert_conn->device; 2247 2248 if (conn->tpg->tpg_attrib.t10_pi) { 2249 if (device->pi_capable) { 2250 isert_info("conn %p PI offload enabled\n", isert_conn); 2251 isert_conn->pi_support = true; 2252 return TARGET_PROT_ALL; 2253 } 2254 } 2255 2256 isert_info("conn %p PI offload disabled\n", isert_conn); 2257 isert_conn->pi_support = false; 2258 2259 return TARGET_PROT_NORMAL; 2260 } 2261 2262 static int 2263 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2264 bool nopout_response) 2265 { 2266 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2267 struct isert_conn *isert_conn = conn->context; 2268 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2269 2270 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2271 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *) 2272 &isert_cmd->tx_desc.iscsi_header, 2273 nopout_response); 2274 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2275 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2276 2277 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn); 2278 2279 return isert_post_response(isert_conn, isert_cmd); 2280 } 2281 2282 static int 2283 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2284 { 2285 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2286 struct isert_conn *isert_conn = conn->context; 2287 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2288 2289 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2290 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *) 2291 &isert_cmd->tx_desc.iscsi_header); 2292 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2293 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2294 2295 isert_dbg("conn %p Posting Logout Response\n", isert_conn); 2296 2297 return isert_post_response(isert_conn, isert_cmd); 2298 } 2299 2300 static int 2301 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2302 { 2303 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2304 struct isert_conn *isert_conn = conn->context; 2305 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2306 2307 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2308 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *) 2309 &isert_cmd->tx_desc.iscsi_header); 2310 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2311 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2312 2313 isert_dbg("conn %p Posting Task Management Response\n", isert_conn); 2314 2315 return isert_post_response(isert_conn, isert_cmd); 2316 } 2317 2318 static int 2319 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2320 { 2321 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2322 struct isert_conn *isert_conn = conn->context; 2323 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2324 struct isert_device *device = isert_conn->device; 2325 struct ib_device *ib_dev = device->ib_device; 2326 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2327 struct iscsi_reject *hdr = 2328 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header; 2329 2330 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2331 iscsit_build_reject(cmd, conn, hdr); 2332 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2333 2334 hton24(hdr->dlength, ISCSI_HDR_LEN); 2335 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2336 (void *)cmd->buf_ptr, ISCSI_HDR_LEN, 2337 DMA_TO_DEVICE); 2338 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN; 2339 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2340 tx_dsg->length = ISCSI_HDR_LEN; 2341 tx_dsg->lkey = device->mr->lkey; 2342 isert_cmd->tx_desc.num_sge = 2; 2343 2344 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2345 2346 isert_dbg("conn %p Posting Reject\n", isert_conn); 2347 2348 return isert_post_response(isert_conn, isert_cmd); 2349 } 2350 2351 static int 2352 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2353 { 2354 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2355 struct isert_conn *isert_conn = conn->context; 2356 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr; 2357 struct iscsi_text_rsp *hdr = 2358 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header; 2359 u32 txt_rsp_len; 2360 int rc; 2361 2362 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc); 2363 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND); 2364 if (rc < 0) 2365 return rc; 2366 2367 txt_rsp_len = rc; 2368 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2369 2370 if (txt_rsp_len) { 2371 struct isert_device *device = isert_conn->device; 2372 struct ib_device *ib_dev = device->ib_device; 2373 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1]; 2374 void *txt_rsp_buf = cmd->buf_ptr; 2375 2376 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev, 2377 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE); 2378 2379 isert_cmd->pdu_buf_len = txt_rsp_len; 2380 tx_dsg->addr = isert_cmd->pdu_buf_dma; 2381 tx_dsg->length = txt_rsp_len; 2382 tx_dsg->lkey = device->mr->lkey; 2383 isert_cmd->tx_desc.num_sge = 2; 2384 } 2385 isert_init_send_wr(isert_conn, isert_cmd, send_wr); 2386 2387 isert_dbg("conn %p Text Response\n", isert_conn); 2388 2389 return isert_post_response(isert_conn, isert_cmd); 2390 } 2391 2392 static int 2393 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd, 2394 struct ib_sge *ib_sge, struct ib_send_wr *send_wr, 2395 u32 data_left, u32 offset) 2396 { 2397 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd; 2398 struct scatterlist *sg_start, *tmp_sg; 2399 struct isert_device *device = isert_conn->device; 2400 struct ib_device *ib_dev = device->ib_device; 2401 u32 sg_off, page_off; 2402 int i = 0, sg_nents; 2403 2404 sg_off = offset / PAGE_SIZE; 2405 sg_start = &cmd->se_cmd.t_data_sg[sg_off]; 2406 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge); 2407 page_off = offset % PAGE_SIZE; 2408 2409 send_wr->sg_list = ib_sge; 2410 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 2411 /* 2412 * Perform mapping of TCM scatterlist memory ib_sge dma_addr. 2413 */ 2414 for_each_sg(sg_start, tmp_sg, sg_nents, i) { 2415 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, " 2416 "page_off: %u\n", 2417 (unsigned long long)tmp_sg->dma_address, 2418 tmp_sg->length, page_off); 2419 2420 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off; 2421 ib_sge->length = min_t(u32, data_left, 2422 ib_sg_dma_len(ib_dev, tmp_sg) - page_off); 2423 ib_sge->lkey = device->mr->lkey; 2424 2425 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n", 2426 ib_sge->addr, ib_sge->length, ib_sge->lkey); 2427 page_off = 0; 2428 data_left -= ib_sge->length; 2429 if (!data_left) 2430 break; 2431 ib_sge++; 2432 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge); 2433 } 2434 2435 send_wr->num_sge = ++i; 2436 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n", 2437 send_wr->sg_list, send_wr->num_sge); 2438 2439 return send_wr->num_sge; 2440 } 2441 2442 static int 2443 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2444 struct isert_rdma_wr *wr) 2445 { 2446 struct se_cmd *se_cmd = &cmd->se_cmd; 2447 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2448 struct isert_conn *isert_conn = conn->context; 2449 struct isert_data_buf *data = &wr->data; 2450 struct ib_send_wr *send_wr; 2451 struct ib_sge *ib_sge; 2452 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0; 2453 int ret = 0, i, ib_sge_cnt; 2454 2455 isert_cmd->tx_desc.isert_cmd = isert_cmd; 2456 2457 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; 2458 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, 2459 se_cmd->t_data_nents, se_cmd->data_length, 2460 offset, wr->iser_ib_op, &wr->data); 2461 if (ret) 2462 return ret; 2463 2464 data_left = data->len; 2465 offset = data->offset; 2466 2467 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL); 2468 if (!ib_sge) { 2469 isert_warn("Unable to allocate ib_sge\n"); 2470 ret = -ENOMEM; 2471 goto unmap_cmd; 2472 } 2473 wr->ib_sge = ib_sge; 2474 2475 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge); 2476 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num, 2477 GFP_KERNEL); 2478 if (!wr->send_wr) { 2479 isert_dbg("Unable to allocate wr->send_wr\n"); 2480 ret = -ENOMEM; 2481 goto unmap_cmd; 2482 } 2483 2484 wr->isert_cmd = isert_cmd; 2485 rdma_write_max = isert_conn->max_sge * PAGE_SIZE; 2486 2487 for (i = 0; i < wr->send_wr_num; i++) { 2488 send_wr = &isert_cmd->rdma_wr.send_wr[i]; 2489 data_len = min(data_left, rdma_write_max); 2490 2491 send_wr->send_flags = 0; 2492 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { 2493 send_wr->opcode = IB_WR_RDMA_WRITE; 2494 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset; 2495 send_wr->wr.rdma.rkey = isert_cmd->read_stag; 2496 if (i + 1 == wr->send_wr_num) 2497 send_wr->next = &isert_cmd->tx_desc.send_wr; 2498 else 2499 send_wr->next = &wr->send_wr[i + 1]; 2500 } else { 2501 send_wr->opcode = IB_WR_RDMA_READ; 2502 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset; 2503 send_wr->wr.rdma.rkey = isert_cmd->write_stag; 2504 if (i + 1 == wr->send_wr_num) 2505 send_wr->send_flags = IB_SEND_SIGNALED; 2506 else 2507 send_wr->next = &wr->send_wr[i + 1]; 2508 } 2509 2510 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge, 2511 send_wr, data_len, offset); 2512 ib_sge += ib_sge_cnt; 2513 2514 offset += data_len; 2515 va_offset += data_len; 2516 data_left -= data_len; 2517 } 2518 2519 return 0; 2520 unmap_cmd: 2521 isert_unmap_data_buf(isert_conn, data); 2522 2523 return ret; 2524 } 2525 2526 static int 2527 isert_map_fr_pagelist(struct ib_device *ib_dev, 2528 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl) 2529 { 2530 u64 start_addr, end_addr, page, chunk_start = 0; 2531 struct scatterlist *tmp_sg; 2532 int i = 0, new_chunk, last_ent, n_pages; 2533 2534 n_pages = 0; 2535 new_chunk = 1; 2536 last_ent = sg_nents - 1; 2537 for_each_sg(sg_start, tmp_sg, sg_nents, i) { 2538 start_addr = ib_sg_dma_address(ib_dev, tmp_sg); 2539 if (new_chunk) 2540 chunk_start = start_addr; 2541 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg); 2542 2543 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n", 2544 i, (unsigned long long)tmp_sg->dma_address, 2545 tmp_sg->length); 2546 2547 if ((end_addr & ~PAGE_MASK) && i < last_ent) { 2548 new_chunk = 0; 2549 continue; 2550 } 2551 new_chunk = 1; 2552 2553 page = chunk_start & PAGE_MASK; 2554 do { 2555 fr_pl[n_pages++] = page; 2556 isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n", 2557 n_pages - 1, page); 2558 page += PAGE_SIZE; 2559 } while (page < end_addr); 2560 } 2561 2562 return n_pages; 2563 } 2564 2565 static inline void 2566 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr) 2567 { 2568 u32 rkey; 2569 2570 memset(inv_wr, 0, sizeof(*inv_wr)); 2571 inv_wr->wr_id = ISER_FASTREG_LI_WRID; 2572 inv_wr->opcode = IB_WR_LOCAL_INV; 2573 inv_wr->ex.invalidate_rkey = mr->rkey; 2574 2575 /* Bump the key */ 2576 rkey = ib_inc_rkey(mr->rkey); 2577 ib_update_fast_reg_key(mr, rkey); 2578 } 2579 2580 static int 2581 isert_fast_reg_mr(struct isert_conn *isert_conn, 2582 struct fast_reg_descriptor *fr_desc, 2583 struct isert_data_buf *mem, 2584 enum isert_indicator ind, 2585 struct ib_sge *sge) 2586 { 2587 struct isert_device *device = isert_conn->device; 2588 struct ib_device *ib_dev = device->ib_device; 2589 struct ib_mr *mr; 2590 struct ib_fast_reg_page_list *frpl; 2591 struct ib_send_wr fr_wr, inv_wr; 2592 struct ib_send_wr *bad_wr, *wr = NULL; 2593 int ret, pagelist_len; 2594 u32 page_off; 2595 2596 if (mem->dma_nents == 1) { 2597 sge->lkey = device->mr->lkey; 2598 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]); 2599 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]); 2600 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", 2601 sge->addr, sge->length, sge->lkey); 2602 return 0; 2603 } 2604 2605 if (ind == ISERT_DATA_KEY_VALID) { 2606 /* Registering data buffer */ 2607 mr = fr_desc->data_mr; 2608 frpl = fr_desc->data_frpl; 2609 } else { 2610 /* Registering protection buffer */ 2611 mr = fr_desc->pi_ctx->prot_mr; 2612 frpl = fr_desc->pi_ctx->prot_frpl; 2613 } 2614 2615 page_off = mem->offset % PAGE_SIZE; 2616 2617 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n", 2618 fr_desc, mem->nents, mem->offset); 2619 2620 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents, 2621 &frpl->page_list[0]); 2622 2623 if (!(fr_desc->ind & ind)) { 2624 isert_inv_rkey(&inv_wr, mr); 2625 wr = &inv_wr; 2626 } 2627 2628 /* Prepare FASTREG WR */ 2629 memset(&fr_wr, 0, sizeof(fr_wr)); 2630 fr_wr.wr_id = ISER_FASTREG_LI_WRID; 2631 fr_wr.opcode = IB_WR_FAST_REG_MR; 2632 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off; 2633 fr_wr.wr.fast_reg.page_list = frpl; 2634 fr_wr.wr.fast_reg.page_list_len = pagelist_len; 2635 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; 2636 fr_wr.wr.fast_reg.length = mem->len; 2637 fr_wr.wr.fast_reg.rkey = mr->rkey; 2638 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE; 2639 2640 if (!wr) 2641 wr = &fr_wr; 2642 else 2643 wr->next = &fr_wr; 2644 2645 ret = ib_post_send(isert_conn->qp, wr, &bad_wr); 2646 if (ret) { 2647 isert_err("fast registration failed, ret:%d\n", ret); 2648 return ret; 2649 } 2650 fr_desc->ind &= ~ind; 2651 2652 sge->lkey = mr->lkey; 2653 sge->addr = frpl->page_list[0] + page_off; 2654 sge->length = mem->len; 2655 2656 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n", 2657 sge->addr, sge->length, sge->lkey); 2658 2659 return ret; 2660 } 2661 2662 static inline void 2663 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs, 2664 struct ib_sig_domain *domain) 2665 { 2666 domain->sig_type = IB_SIG_TYPE_T10_DIF; 2667 domain->sig.dif.bg_type = IB_T10DIF_CRC; 2668 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size; 2669 domain->sig.dif.ref_tag = se_cmd->reftag_seed; 2670 /* 2671 * At the moment we hard code those, but if in the future 2672 * the target core would like to use it, we will take it 2673 * from se_cmd. 2674 */ 2675 domain->sig.dif.apptag_check_mask = 0xffff; 2676 domain->sig.dif.app_escape = true; 2677 domain->sig.dif.ref_escape = true; 2678 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT || 2679 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT) 2680 domain->sig.dif.ref_remap = true; 2681 }; 2682 2683 static int 2684 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs) 2685 { 2686 switch (se_cmd->prot_op) { 2687 case TARGET_PROT_DIN_INSERT: 2688 case TARGET_PROT_DOUT_STRIP: 2689 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; 2690 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2691 break; 2692 case TARGET_PROT_DOUT_INSERT: 2693 case TARGET_PROT_DIN_STRIP: 2694 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; 2695 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2696 break; 2697 case TARGET_PROT_DIN_PASS: 2698 case TARGET_PROT_DOUT_PASS: 2699 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire); 2700 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem); 2701 break; 2702 default: 2703 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op); 2704 return -EINVAL; 2705 } 2706 2707 return 0; 2708 } 2709 2710 static inline u8 2711 isert_set_prot_checks(u8 prot_checks) 2712 { 2713 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) | 2714 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) | 2715 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0); 2716 } 2717 2718 static int 2719 isert_reg_sig_mr(struct isert_conn *isert_conn, 2720 struct se_cmd *se_cmd, 2721 struct isert_rdma_wr *rdma_wr, 2722 struct fast_reg_descriptor *fr_desc) 2723 { 2724 struct ib_send_wr sig_wr, inv_wr; 2725 struct ib_send_wr *bad_wr, *wr = NULL; 2726 struct pi_context *pi_ctx = fr_desc->pi_ctx; 2727 struct ib_sig_attrs sig_attrs; 2728 int ret; 2729 2730 memset(&sig_attrs, 0, sizeof(sig_attrs)); 2731 ret = isert_set_sig_attrs(se_cmd, &sig_attrs); 2732 if (ret) 2733 goto err; 2734 2735 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks); 2736 2737 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) { 2738 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr); 2739 wr = &inv_wr; 2740 } 2741 2742 memset(&sig_wr, 0, sizeof(sig_wr)); 2743 sig_wr.opcode = IB_WR_REG_SIG_MR; 2744 sig_wr.wr_id = ISER_FASTREG_LI_WRID; 2745 sig_wr.sg_list = &rdma_wr->ib_sg[DATA]; 2746 sig_wr.num_sge = 1; 2747 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE; 2748 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs; 2749 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr; 2750 if (se_cmd->t_prot_sg) 2751 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT]; 2752 2753 if (!wr) 2754 wr = &sig_wr; 2755 else 2756 wr->next = &sig_wr; 2757 2758 ret = ib_post_send(isert_conn->qp, wr, &bad_wr); 2759 if (ret) { 2760 isert_err("fast registration failed, ret:%d\n", ret); 2761 goto err; 2762 } 2763 fr_desc->ind &= ~ISERT_SIG_KEY_VALID; 2764 2765 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey; 2766 rdma_wr->ib_sg[SIG].addr = 0; 2767 rdma_wr->ib_sg[SIG].length = se_cmd->data_length; 2768 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP && 2769 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT) 2770 /* 2771 * We have protection guards on the wire 2772 * so we need to set a larget transfer 2773 */ 2774 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length; 2775 2776 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n", 2777 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length, 2778 rdma_wr->ib_sg[SIG].lkey); 2779 err: 2780 return ret; 2781 } 2782 2783 static int 2784 isert_handle_prot_cmd(struct isert_conn *isert_conn, 2785 struct isert_cmd *isert_cmd, 2786 struct isert_rdma_wr *wr) 2787 { 2788 struct isert_device *device = isert_conn->device; 2789 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd; 2790 int ret; 2791 2792 if (!wr->fr_desc->pi_ctx) { 2793 ret = isert_create_pi_ctx(wr->fr_desc, 2794 device->ib_device, 2795 device->pd); 2796 if (ret) { 2797 isert_err("conn %p failed to allocate pi_ctx\n", 2798 isert_conn); 2799 return ret; 2800 } 2801 } 2802 2803 if (se_cmd->t_prot_sg) { 2804 ret = isert_map_data_buf(isert_conn, isert_cmd, 2805 se_cmd->t_prot_sg, 2806 se_cmd->t_prot_nents, 2807 se_cmd->prot_length, 2808 0, wr->iser_ib_op, &wr->prot); 2809 if (ret) { 2810 isert_err("conn %p failed to map protection buffer\n", 2811 isert_conn); 2812 return ret; 2813 } 2814 2815 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT])); 2816 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot, 2817 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]); 2818 if (ret) { 2819 isert_err("conn %p failed to fast reg mr\n", 2820 isert_conn); 2821 goto unmap_prot_cmd; 2822 } 2823 } 2824 2825 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc); 2826 if (ret) { 2827 isert_err("conn %p failed to fast reg mr\n", 2828 isert_conn); 2829 goto unmap_prot_cmd; 2830 } 2831 wr->fr_desc->ind |= ISERT_PROTECTED; 2832 2833 return 0; 2834 2835 unmap_prot_cmd: 2836 if (se_cmd->t_prot_sg) 2837 isert_unmap_data_buf(isert_conn, &wr->prot); 2838 2839 return ret; 2840 } 2841 2842 static int 2843 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2844 struct isert_rdma_wr *wr) 2845 { 2846 struct se_cmd *se_cmd = &cmd->se_cmd; 2847 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2848 struct isert_conn *isert_conn = conn->context; 2849 struct fast_reg_descriptor *fr_desc = NULL; 2850 struct ib_send_wr *send_wr; 2851 struct ib_sge *ib_sg; 2852 u32 offset; 2853 int ret = 0; 2854 unsigned long flags; 2855 2856 isert_cmd->tx_desc.isert_cmd = isert_cmd; 2857 2858 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0; 2859 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg, 2860 se_cmd->t_data_nents, se_cmd->data_length, 2861 offset, wr->iser_ib_op, &wr->data); 2862 if (ret) 2863 return ret; 2864 2865 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) { 2866 spin_lock_irqsave(&isert_conn->pool_lock, flags); 2867 fr_desc = list_first_entry(&isert_conn->fr_pool, 2868 struct fast_reg_descriptor, list); 2869 list_del(&fr_desc->list); 2870 spin_unlock_irqrestore(&isert_conn->pool_lock, flags); 2871 wr->fr_desc = fr_desc; 2872 } 2873 2874 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, 2875 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]); 2876 if (ret) 2877 goto unmap_cmd; 2878 2879 if (isert_prot_cmd(isert_conn, se_cmd)) { 2880 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr); 2881 if (ret) 2882 goto unmap_cmd; 2883 2884 ib_sg = &wr->ib_sg[SIG]; 2885 } else { 2886 ib_sg = &wr->ib_sg[DATA]; 2887 } 2888 2889 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg)); 2890 wr->ib_sge = &wr->s_ib_sge; 2891 wr->send_wr_num = 1; 2892 memset(&wr->s_send_wr, 0, sizeof(*send_wr)); 2893 wr->send_wr = &wr->s_send_wr; 2894 wr->isert_cmd = isert_cmd; 2895 2896 send_wr = &isert_cmd->rdma_wr.s_send_wr; 2897 send_wr->sg_list = &wr->s_ib_sge; 2898 send_wr->num_sge = 1; 2899 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc; 2900 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) { 2901 send_wr->opcode = IB_WR_RDMA_WRITE; 2902 send_wr->wr.rdma.remote_addr = isert_cmd->read_va; 2903 send_wr->wr.rdma.rkey = isert_cmd->read_stag; 2904 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ? 2905 0 : IB_SEND_SIGNALED; 2906 } else { 2907 send_wr->opcode = IB_WR_RDMA_READ; 2908 send_wr->wr.rdma.remote_addr = isert_cmd->write_va; 2909 send_wr->wr.rdma.rkey = isert_cmd->write_stag; 2910 send_wr->send_flags = IB_SEND_SIGNALED; 2911 } 2912 2913 return 0; 2914 2915 unmap_cmd: 2916 if (fr_desc) { 2917 spin_lock_irqsave(&isert_conn->pool_lock, flags); 2918 list_add_tail(&fr_desc->list, &isert_conn->fr_pool); 2919 spin_unlock_irqrestore(&isert_conn->pool_lock, flags); 2920 } 2921 isert_unmap_data_buf(isert_conn, &wr->data); 2922 2923 return ret; 2924 } 2925 2926 static int 2927 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 2928 { 2929 struct se_cmd *se_cmd = &cmd->se_cmd; 2930 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2931 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 2932 struct isert_conn *isert_conn = conn->context; 2933 struct isert_device *device = isert_conn->device; 2934 struct ib_send_wr *wr_failed; 2935 int rc; 2936 2937 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n", 2938 isert_cmd, se_cmd->data_length); 2939 2940 wr->iser_ib_op = ISER_IB_RDMA_WRITE; 2941 rc = device->reg_rdma_mem(conn, cmd, wr); 2942 if (rc) { 2943 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); 2944 return rc; 2945 } 2946 2947 if (!isert_prot_cmd(isert_conn, se_cmd)) { 2948 /* 2949 * Build isert_conn->tx_desc for iSCSI response PDU and attach 2950 */ 2951 isert_create_send_desc(isert_conn, isert_cmd, 2952 &isert_cmd->tx_desc); 2953 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *) 2954 &isert_cmd->tx_desc.iscsi_header); 2955 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc); 2956 isert_init_send_wr(isert_conn, isert_cmd, 2957 &isert_cmd->tx_desc.send_wr); 2958 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr; 2959 wr->send_wr_num += 1; 2960 } 2961 2962 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); 2963 if (rc) 2964 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n"); 2965 2966 if (!isert_prot_cmd(isert_conn, se_cmd)) 2967 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data " 2968 "READ\n", isert_cmd); 2969 else 2970 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", 2971 isert_cmd); 2972 2973 return 1; 2974 } 2975 2976 static int 2977 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery) 2978 { 2979 struct se_cmd *se_cmd = &cmd->se_cmd; 2980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd); 2981 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr; 2982 struct isert_conn *isert_conn = conn->context; 2983 struct isert_device *device = isert_conn->device; 2984 struct ib_send_wr *wr_failed; 2985 int rc; 2986 2987 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n", 2988 isert_cmd, se_cmd->data_length, cmd->write_data_done); 2989 wr->iser_ib_op = ISER_IB_RDMA_READ; 2990 rc = device->reg_rdma_mem(conn, cmd, wr); 2991 if (rc) { 2992 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd); 2993 return rc; 2994 } 2995 2996 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed); 2997 if (rc) 2998 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n"); 2999 3000 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n", 3001 isert_cmd); 3002 3003 return 0; 3004 } 3005 3006 static int 3007 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3008 { 3009 int ret; 3010 3011 switch (state) { 3012 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3013 ret = isert_put_nopin(cmd, conn, false); 3014 break; 3015 default: 3016 isert_err("Unknown immediate state: 0x%02x\n", state); 3017 ret = -EINVAL; 3018 break; 3019 } 3020 3021 return ret; 3022 } 3023 3024 static int 3025 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3026 { 3027 struct isert_conn *isert_conn = conn->context; 3028 int ret; 3029 3030 switch (state) { 3031 case ISTATE_SEND_LOGOUTRSP: 3032 ret = isert_put_logout_rsp(cmd, conn); 3033 if (!ret) 3034 isert_conn->logout_posted = true; 3035 break; 3036 case ISTATE_SEND_NOPIN: 3037 ret = isert_put_nopin(cmd, conn, true); 3038 break; 3039 case ISTATE_SEND_TASKMGTRSP: 3040 ret = isert_put_tm_rsp(cmd, conn); 3041 break; 3042 case ISTATE_SEND_REJECT: 3043 ret = isert_put_reject(cmd, conn); 3044 break; 3045 case ISTATE_SEND_TEXTRSP: 3046 ret = isert_put_text_rsp(cmd, conn); 3047 break; 3048 case ISTATE_SEND_STATUS: 3049 /* 3050 * Special case for sending non GOOD SCSI status from TX thread 3051 * context during pre se_cmd excecution failure. 3052 */ 3053 ret = isert_put_response(conn, cmd); 3054 break; 3055 default: 3056 isert_err("Unknown response state: 0x%02x\n", state); 3057 ret = -EINVAL; 3058 break; 3059 } 3060 3061 return ret; 3062 } 3063 3064 struct rdma_cm_id * 3065 isert_setup_id(struct isert_np *isert_np) 3066 { 3067 struct iscsi_np *np = isert_np->np; 3068 struct rdma_cm_id *id; 3069 struct sockaddr *sa; 3070 int ret; 3071 3072 sa = (struct sockaddr *)&np->np_sockaddr; 3073 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa); 3074 3075 id = rdma_create_id(isert_cma_handler, isert_np, 3076 RDMA_PS_TCP, IB_QPT_RC); 3077 if (IS_ERR(id)) { 3078 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id)); 3079 ret = PTR_ERR(id); 3080 goto out; 3081 } 3082 isert_dbg("id %p context %p\n", id, id->context); 3083 3084 ret = rdma_bind_addr(id, sa); 3085 if (ret) { 3086 isert_err("rdma_bind_addr() failed: %d\n", ret); 3087 goto out_id; 3088 } 3089 3090 ret = rdma_listen(id, 0); 3091 if (ret) { 3092 isert_err("rdma_listen() failed: %d\n", ret); 3093 goto out_id; 3094 } 3095 3096 return id; 3097 out_id: 3098 rdma_destroy_id(id); 3099 out: 3100 return ERR_PTR(ret); 3101 } 3102 3103 static int 3104 isert_setup_np(struct iscsi_np *np, 3105 struct __kernel_sockaddr_storage *ksockaddr) 3106 { 3107 struct isert_np *isert_np; 3108 struct rdma_cm_id *isert_lid; 3109 int ret; 3110 3111 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL); 3112 if (!isert_np) { 3113 isert_err("Unable to allocate struct isert_np\n"); 3114 return -ENOMEM; 3115 } 3116 sema_init(&isert_np->np_sem, 0); 3117 mutex_init(&isert_np->np_accept_mutex); 3118 INIT_LIST_HEAD(&isert_np->np_accept_list); 3119 init_completion(&isert_np->np_login_comp); 3120 isert_np->np = np; 3121 3122 /* 3123 * Setup the np->np_sockaddr from the passed sockaddr setup 3124 * in iscsi_target_configfs.c code.. 3125 */ 3126 memcpy(&np->np_sockaddr, ksockaddr, 3127 sizeof(struct __kernel_sockaddr_storage)); 3128 3129 isert_lid = isert_setup_id(isert_np); 3130 if (IS_ERR(isert_lid)) { 3131 ret = PTR_ERR(isert_lid); 3132 goto out; 3133 } 3134 3135 isert_np->np_cm_id = isert_lid; 3136 np->np_context = isert_np; 3137 3138 return 0; 3139 3140 out: 3141 kfree(isert_np); 3142 3143 return ret; 3144 } 3145 3146 static int 3147 isert_rdma_accept(struct isert_conn *isert_conn) 3148 { 3149 struct rdma_cm_id *cm_id = isert_conn->cm_id; 3150 struct rdma_conn_param cp; 3151 int ret; 3152 3153 memset(&cp, 0, sizeof(struct rdma_conn_param)); 3154 cp.initiator_depth = isert_conn->initiator_depth; 3155 cp.retry_count = 7; 3156 cp.rnr_retry_count = 7; 3157 3158 ret = rdma_accept(cm_id, &cp); 3159 if (ret) { 3160 isert_err("rdma_accept() failed with: %d\n", ret); 3161 return ret; 3162 } 3163 3164 return 0; 3165 } 3166 3167 static int 3168 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 3169 { 3170 struct isert_conn *isert_conn = conn->context; 3171 int ret; 3172 3173 isert_info("before login_req comp conn: %p\n", isert_conn); 3174 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp); 3175 if (ret) { 3176 isert_err("isert_conn %p interrupted before got login req\n", 3177 isert_conn); 3178 return ret; 3179 } 3180 reinit_completion(&isert_conn->login_req_comp); 3181 3182 /* 3183 * For login requests after the first PDU, isert_rx_login_req() will 3184 * kick schedule_delayed_work(&conn->login_work) as the packet is 3185 * received, which turns this callback from iscsi_target_do_login_rx() 3186 * into a NOP. 3187 */ 3188 if (!login->first_request) 3189 return 0; 3190 3191 isert_rx_login_req(isert_conn); 3192 3193 isert_info("before login_comp conn: %p\n", conn); 3194 ret = wait_for_completion_interruptible(&isert_conn->login_comp); 3195 if (ret) 3196 return ret; 3197 3198 isert_info("processing login->req: %p\n", login->req); 3199 3200 return 0; 3201 } 3202 3203 static void 3204 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn, 3205 struct isert_conn *isert_conn) 3206 { 3207 struct rdma_cm_id *cm_id = isert_conn->cm_id; 3208 struct rdma_route *cm_route = &cm_id->route; 3209 struct sockaddr_in *sock_in; 3210 struct sockaddr_in6 *sock_in6; 3211 3212 conn->login_family = np->np_sockaddr.ss_family; 3213 3214 if (np->np_sockaddr.ss_family == AF_INET6) { 3215 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr; 3216 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c", 3217 &sock_in6->sin6_addr.in6_u); 3218 conn->login_port = ntohs(sock_in6->sin6_port); 3219 3220 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr; 3221 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c", 3222 &sock_in6->sin6_addr.in6_u); 3223 conn->local_port = ntohs(sock_in6->sin6_port); 3224 } else { 3225 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr; 3226 sprintf(conn->login_ip, "%pI4", 3227 &sock_in->sin_addr.s_addr); 3228 conn->login_port = ntohs(sock_in->sin_port); 3229 3230 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr; 3231 sprintf(conn->local_ip, "%pI4", 3232 &sock_in->sin_addr.s_addr); 3233 conn->local_port = ntohs(sock_in->sin_port); 3234 } 3235 } 3236 3237 static int 3238 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 3239 { 3240 struct isert_np *isert_np = np->np_context; 3241 struct isert_conn *isert_conn; 3242 int ret; 3243 3244 accept_wait: 3245 ret = down_interruptible(&isert_np->np_sem); 3246 if (ret) 3247 return -ENODEV; 3248 3249 spin_lock_bh(&np->np_thread_lock); 3250 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) { 3251 spin_unlock_bh(&np->np_thread_lock); 3252 isert_dbg("np_thread_state %d\n", 3253 np->np_thread_state); 3254 /** 3255 * No point in stalling here when np_thread 3256 * is in state RESET/SHUTDOWN/EXIT - bail 3257 **/ 3258 return -ENODEV; 3259 } 3260 spin_unlock_bh(&np->np_thread_lock); 3261 3262 mutex_lock(&isert_np->np_accept_mutex); 3263 if (list_empty(&isert_np->np_accept_list)) { 3264 mutex_unlock(&isert_np->np_accept_mutex); 3265 goto accept_wait; 3266 } 3267 isert_conn = list_first_entry(&isert_np->np_accept_list, 3268 struct isert_conn, accept_node); 3269 list_del_init(&isert_conn->accept_node); 3270 mutex_unlock(&isert_np->np_accept_mutex); 3271 3272 conn->context = isert_conn; 3273 isert_conn->conn = conn; 3274 3275 isert_set_conn_info(np, conn, isert_conn); 3276 3277 isert_dbg("Processing isert_conn: %p\n", isert_conn); 3278 3279 return 0; 3280 } 3281 3282 static void 3283 isert_free_np(struct iscsi_np *np) 3284 { 3285 struct isert_np *isert_np = np->np_context; 3286 struct isert_conn *isert_conn, *n; 3287 3288 if (isert_np->np_cm_id) 3289 rdma_destroy_id(isert_np->np_cm_id); 3290 3291 /* 3292 * FIXME: At this point we don't have a good way to insure 3293 * that at this point we don't have hanging connections that 3294 * completed RDMA establishment but didn't start iscsi login 3295 * process. So work-around this by cleaning up what ever piled 3296 * up in np_accept_list. 3297 */ 3298 mutex_lock(&isert_np->np_accept_mutex); 3299 if (!list_empty(&isert_np->np_accept_list)) { 3300 isert_info("Still have isert connections, cleaning up...\n"); 3301 list_for_each_entry_safe(isert_conn, n, 3302 &isert_np->np_accept_list, 3303 accept_node) { 3304 isert_info("cleaning isert_conn %p state (%d)\n", 3305 isert_conn, isert_conn->state); 3306 isert_connect_release(isert_conn); 3307 } 3308 } 3309 mutex_unlock(&isert_np->np_accept_mutex); 3310 3311 np->np_context = NULL; 3312 kfree(isert_np); 3313 } 3314 3315 static void isert_release_work(struct work_struct *work) 3316 { 3317 struct isert_conn *isert_conn = container_of(work, 3318 struct isert_conn, 3319 release_work); 3320 3321 isert_info("Starting release conn %p\n", isert_conn); 3322 3323 wait_for_completion(&isert_conn->wait); 3324 3325 mutex_lock(&isert_conn->mutex); 3326 isert_conn->state = ISER_CONN_DOWN; 3327 mutex_unlock(&isert_conn->mutex); 3328 3329 isert_info("Destroying conn %p\n", isert_conn); 3330 isert_put_conn(isert_conn); 3331 } 3332 3333 static void 3334 isert_wait4logout(struct isert_conn *isert_conn) 3335 { 3336 struct iscsi_conn *conn = isert_conn->conn; 3337 3338 isert_info("conn %p\n", isert_conn); 3339 3340 if (isert_conn->logout_posted) { 3341 isert_info("conn %p wait for conn_logout_comp\n", isert_conn); 3342 wait_for_completion_timeout(&conn->conn_logout_comp, 3343 SECONDS_FOR_LOGOUT_COMP * HZ); 3344 } 3345 } 3346 3347 static void 3348 isert_wait4cmds(struct iscsi_conn *conn) 3349 { 3350 isert_info("iscsi_conn %p\n", conn); 3351 3352 if (conn->sess) { 3353 target_sess_cmd_list_set_waiting(conn->sess->se_sess); 3354 target_wait_for_sess_cmds(conn->sess->se_sess); 3355 } 3356 } 3357 3358 static void 3359 isert_wait4flush(struct isert_conn *isert_conn) 3360 { 3361 struct ib_recv_wr *bad_wr; 3362 3363 isert_info("conn %p\n", isert_conn); 3364 3365 init_completion(&isert_conn->wait_comp_err); 3366 isert_conn->beacon.wr_id = ISER_BEACON_WRID; 3367 /* post an indication that all flush errors were consumed */ 3368 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) { 3369 isert_err("conn %p failed to post beacon", isert_conn); 3370 return; 3371 } 3372 3373 wait_for_completion(&isert_conn->wait_comp_err); 3374 } 3375 3376 static void isert_wait_conn(struct iscsi_conn *conn) 3377 { 3378 struct isert_conn *isert_conn = conn->context; 3379 3380 isert_info("Starting conn %p\n", isert_conn); 3381 3382 mutex_lock(&isert_conn->mutex); 3383 /* 3384 * Only wait for wait_comp_err if the isert_conn made it 3385 * into full feature phase.. 3386 */ 3387 if (isert_conn->state == ISER_CONN_INIT) { 3388 mutex_unlock(&isert_conn->mutex); 3389 return; 3390 } 3391 isert_conn_terminate(isert_conn); 3392 mutex_unlock(&isert_conn->mutex); 3393 3394 isert_wait4cmds(conn); 3395 isert_wait4flush(isert_conn); 3396 isert_wait4logout(isert_conn); 3397 3398 queue_work(isert_release_wq, &isert_conn->release_work); 3399 } 3400 3401 static void isert_free_conn(struct iscsi_conn *conn) 3402 { 3403 struct isert_conn *isert_conn = conn->context; 3404 3405 isert_wait4flush(isert_conn); 3406 isert_put_conn(isert_conn); 3407 } 3408 3409 static struct iscsit_transport iser_target_transport = { 3410 .name = "IB/iSER", 3411 .transport_type = ISCSI_INFINIBAND, 3412 .priv_size = sizeof(struct isert_cmd), 3413 .owner = THIS_MODULE, 3414 .iscsit_setup_np = isert_setup_np, 3415 .iscsit_accept_np = isert_accept_np, 3416 .iscsit_free_np = isert_free_np, 3417 .iscsit_wait_conn = isert_wait_conn, 3418 .iscsit_free_conn = isert_free_conn, 3419 .iscsit_get_login_rx = isert_get_login_rx, 3420 .iscsit_put_login_tx = isert_put_login_tx, 3421 .iscsit_immediate_queue = isert_immediate_queue, 3422 .iscsit_response_queue = isert_response_queue, 3423 .iscsit_get_dataout = isert_get_dataout, 3424 .iscsit_queue_data_in = isert_put_datain, 3425 .iscsit_queue_status = isert_put_response, 3426 .iscsit_aborted_task = isert_aborted_task, 3427 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops, 3428 }; 3429 3430 static int __init isert_init(void) 3431 { 3432 int ret; 3433 3434 isert_comp_wq = alloc_workqueue("isert_comp_wq", 3435 WQ_UNBOUND | WQ_HIGHPRI, 0); 3436 if (!isert_comp_wq) { 3437 isert_err("Unable to allocate isert_comp_wq\n"); 3438 ret = -ENOMEM; 3439 return -ENOMEM; 3440 } 3441 3442 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND, 3443 WQ_UNBOUND_MAX_ACTIVE); 3444 if (!isert_release_wq) { 3445 isert_err("Unable to allocate isert_release_wq\n"); 3446 ret = -ENOMEM; 3447 goto destroy_comp_wq; 3448 } 3449 3450 iscsit_register_transport(&iser_target_transport); 3451 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n"); 3452 3453 return 0; 3454 3455 destroy_comp_wq: 3456 destroy_workqueue(isert_comp_wq); 3457 3458 return ret; 3459 } 3460 3461 static void __exit isert_exit(void) 3462 { 3463 flush_scheduled_work(); 3464 destroy_workqueue(isert_release_wq); 3465 destroy_workqueue(isert_comp_wq); 3466 iscsit_unregister_transport(&iser_target_transport); 3467 isert_info("iSER_TARGET[0] - Released iser_target_transport\n"); 3468 } 3469 3470 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure"); 3471 MODULE_VERSION("1.0"); 3472 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 3473 MODULE_LICENSE("GPL"); 3474 3475 module_init(isert_init); 3476 module_exit(isert_exit); 3477