drivers/infiniband/ulp/isert/ib_isert.c

   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 int isert_debug_level = 0;
  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 inline bool
  69 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  70 {
  71         return (conn->pi_support &&
  72                 cmd->prot_op != TARGET_PROT_NORMAL);
  73 }
  74
  75
  76 static void
  77 isert_qp_event_callback(struct ib_event *e, void *context)
  78 {
  79         struct isert_conn *isert_conn = (struct isert_conn *)context;
  80
  81         isert_err("isert_qp_event_callback event: %d\n", e->event);
  82         switch (e->event) {
  83         case IB_EVENT_COMM_EST:
  84                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  85                 break;
  86         case IB_EVENT_QP_LAST_WQE_REACHED:
  87                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  88                 break;
  89         default:
  90                 break;
  91         }
  92 }
  93
  94 static int
  95 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  96 {
  97         int ret;
  98
  99         ret = ib_query_device(ib_dev, devattr);
 100         if (ret) {
 101                 isert_err("ib_query_device() failed: %d\n", ret);
 102                 return ret;
 103         }
 104         isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
 105         isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
 106
 107         return 0;
 108 }
 109
 110 static int
 111 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 112 {
 113         struct isert_device *device = isert_conn->conn_device;
 114         struct ib_qp_init_attr attr;
 115         struct isert_comp *comp;
 116         int ret, i, min = 0;
 117
 118         mutex_lock(&device_list_mutex);
 119         for (i = 0; i < device->comps_used; i++)
 120                 if (device->comps[i].active_qps <
 121                     device->comps[min].active_qps)
 122                         min = i;
 123         comp = &device->comps[min];
 124         comp->active_qps++;
 125         isert_info("conn %p, using comp %p min_index: %d\n",
 126                    isert_conn, comp, min);
 127         mutex_unlock(&device_list_mutex);
 128
 129         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 130         attr.event_handler = isert_qp_event_callback;
 131         attr.qp_context = isert_conn;
 132         attr.send_cq = comp->cq;
 133         attr.recv_cq = comp->cq;
 134         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 135         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 136         /*
 137          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 138          * work-around for RDMA_READs with ConnectX-2.
 139          *
 140          * Also, still make sure to have at least two SGEs for
 141          * outgoing control PDU responses.
 142          */
 143         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 144         isert_conn->max_sge = attr.cap.max_send_sge;
 145
 146         attr.cap.max_recv_sge = 1;
 147         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 148         attr.qp_type = IB_QPT_RC;
 149         if (device->pi_capable)
 150                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 151
 152         isert_dbg("isert_conn_setup_qp cma_id->device: %p\n",
 153                  cma_id->device);
 154         isert_dbg("isert_conn_setup_qp conn_pd->device: %p\n",
 155                  isert_conn->conn_pd->device);
 156
 157         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 158         if (ret) {
 159                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 160                 goto err;
 161         }
 162         isert_conn->conn_qp = cma_id->qp;
 163         isert_dbg("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 164
 165         return 0;
 166 err:
 167         mutex_lock(&device_list_mutex);
 168         comp->active_qps--;
 169         mutex_unlock(&device_list_mutex);
 170
 171         return ret;
 172 }
 173
 174 static void
 175 isert_cq_event_callback(struct ib_event *e, void *context)
 176 {
 177         isert_dbg("isert_cq_event_callback event: %d\n", e->event);
 178 }
 179
 180 static int
 181 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 182 {
 183         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 184         struct iser_rx_desc *rx_desc;
 185         struct ib_sge *rx_sg;
 186         u64 dma_addr;
 187         int i, j;
 188
 189         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 190                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 191         if (!isert_conn->conn_rx_descs)
 192                 goto fail;
 193
 194         rx_desc = isert_conn->conn_rx_descs;
 195
 196         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 197                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 198                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 199                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 200                         goto dma_map_fail;
 201
 202                 rx_desc->dma_addr = dma_addr;
 203
 204                 rx_sg = &rx_desc->rx_sg;
 205                 rx_sg->addr = rx_desc->dma_addr;
 206                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 207                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 208         }
 209
 210         isert_conn->conn_rx_desc_head = 0;
 211         return 0;
 212
 213 dma_map_fail:
 214         rx_desc = isert_conn->conn_rx_descs;
 215         for (j = 0; j < i; j++, rx_desc++) {
 216                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 217                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 218         }
 219         kfree(isert_conn->conn_rx_descs);
 220         isert_conn->conn_rx_descs = NULL;
 221 fail:
 222         return -ENOMEM;
 223 }
 224
 225 static void
 226 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 227 {
 228         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 229         struct iser_rx_desc *rx_desc;
 230         int i;
 231
 232         if (!isert_conn->conn_rx_descs)
 233                 return;
 234
 235         rx_desc = isert_conn->conn_rx_descs;
 236         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 237                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 238                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 239         }
 240
 241         kfree(isert_conn->conn_rx_descs);
 242         isert_conn->conn_rx_descs = NULL;
 243 }
 244
 245 static void isert_cq_work(struct work_struct *);
 246 static void isert_cq_callback(struct ib_cq *, void *);
 247
 248 static int
 249 isert_create_device_ib_res(struct isert_device *device)
 250 {
 251         struct ib_device *ib_dev = device->ib_device;
 252         struct ib_device_attr *dev_attr;
 253         int ret = 0, i;
 254         int max_cqe;
 255
 256         dev_attr = &device->dev_attr;
 257         ret = isert_query_device(ib_dev, dev_attr);
 258         if (ret)
 259                 return ret;
 260
 261         max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe);
 262
 263         /* asign function handlers */
 264         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 265             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 266                 device->use_fastreg = 1;
 267                 device->reg_rdma_mem = isert_reg_rdma;
 268                 device->unreg_rdma_mem = isert_unreg_rdma;
 269         } else {
 270                 device->use_fastreg = 0;
 271                 device->reg_rdma_mem = isert_map_rdma;
 272                 device->unreg_rdma_mem = isert_unmap_cmd;
 273         }
 274
 275         /* Check signature cap */
 276         device->pi_capable = dev_attr->device_cap_flags &
 277                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 278
 279         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 280                                         device->ib_device->num_comp_vectors));
 281         isert_info("Using %d CQs, %s supports %d vectors support "
 282                    "Fast registration %d pi_capable %d\n",
 283                    device->comps_used, device->ib_device->name,
 284                    device->ib_device->num_comp_vectors, device->use_fastreg,
 285                    device->pi_capable);
 286
 287         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 288                                 GFP_KERNEL);
 289         if (!device->comps) {
 290                 isert_err("Unable to allocate completion contexts\n");
 291                 return -ENOMEM;
 292         }
 293
 294         for (i = 0; i < device->comps_used; i++) {
 295                 struct isert_comp *comp = &device->comps[i];
 296
 297                 comp->device = device;
 298                 INIT_WORK(&comp->work, isert_cq_work);
 299                 comp->cq = ib_create_cq(device->ib_device,
 300                                         isert_cq_callback,
 301                                         isert_cq_event_callback,
 302                                         (void *)comp,
 303                                         max_cqe, i);
 304                 if (IS_ERR(comp->cq)) {
 305                         ret = PTR_ERR(comp->cq);
 306                         comp->cq = NULL;
 307                         goto out_cq;
 308                 }
 309
 310                 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
 311                 if (ret)
 312                         goto out_cq;
 313         }
 314
 315         return 0;
 316
 317 out_cq:
 318         for (i = 0; i < device->comps_used; i++) {
 319                 struct isert_comp *comp = &device->comps[i];
 320
 321                 if (comp->cq) {
 322                         cancel_work_sync(&comp->work);
 323                         ib_destroy_cq(comp->cq);
 324                 }
 325         }
 326         kfree(device->comps);
 327
 328         return ret;
 329 }
 330
 331 static void
 332 isert_free_device_ib_res(struct isert_device *device)
 333 {
 334         int i;
 335
 336         isert_info("device %p\n", device);
 337
 338         for (i = 0; i < device->comps_used; i++) {
 339                 struct isert_comp *comp = &device->comps[i];
 340
 341                 cancel_work_sync(&comp->work);
 342                 ib_destroy_cq(comp->cq);
 343                 comp->cq = NULL;
 344         }
 345         kfree(device->comps);
 346 }
 347
 348 static void
 349 isert_device_try_release(struct isert_device *device)
 350 {
 351         mutex_lock(&device_list_mutex);
 352         device->refcount--;
 353         if (!device->refcount) {
 354                 isert_free_device_ib_res(device);
 355                 list_del(&device->dev_node);
 356                 kfree(device);
 357         }
 358         mutex_unlock(&device_list_mutex);
 359 }
 360
 361 static struct isert_device *
 362 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 363 {
 364         struct isert_device *device;
 365         int ret;
 366
 367         mutex_lock(&device_list_mutex);
 368         list_for_each_entry(device, &device_list, dev_node) {
 369                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 370                         device->refcount++;
 371                         mutex_unlock(&device_list_mutex);
 372                         return device;
 373                 }
 374         }
 375
 376         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 377         if (!device) {
 378                 mutex_unlock(&device_list_mutex);
 379                 return ERR_PTR(-ENOMEM);
 380         }
 381
 382         INIT_LIST_HEAD(&device->dev_node);
 383
 384         device->ib_device = cma_id->device;
 385         ret = isert_create_device_ib_res(device);
 386         if (ret) {
 387                 kfree(device);
 388                 mutex_unlock(&device_list_mutex);
 389                 return ERR_PTR(ret);
 390         }
 391
 392         device->refcount++;
 393         list_add_tail(&device->dev_node, &device_list);
 394         mutex_unlock(&device_list_mutex);
 395
 396         return device;
 397 }
 398
 399 static void
 400 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 401 {
 402         struct fast_reg_descriptor *fr_desc, *tmp;
 403         int i = 0;
 404
 405         if (list_empty(&isert_conn->conn_fr_pool))
 406                 return;
 407
 408         isert_dbg("Freeing conn %p fastreg pool", isert_conn);
 409
 410         list_for_each_entry_safe(fr_desc, tmp,
 411                                  &isert_conn->conn_fr_pool, list) {
 412                 list_del(&fr_desc->list);
 413                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 414                 ib_dereg_mr(fr_desc->data_mr);
 415                 if (fr_desc->pi_ctx) {
 416                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 417                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 418                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 419                         kfree(fr_desc->pi_ctx);
 420                 }
 421                 kfree(fr_desc);
 422                 ++i;
 423         }
 424
 425         if (i < isert_conn->conn_fr_pool_size)
 426                 isert_warn("Pool still has %d regions registered\n",
 427                         isert_conn->conn_fr_pool_size - i);
 428 }
 429
 430 static int
 431 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
 432                     struct ib_device *device,
 433                     struct ib_pd *pd)
 434 {
 435         struct ib_mr_init_attr mr_init_attr;
 436         struct pi_context *pi_ctx;
 437         int ret;
 438
 439         pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
 440         if (!pi_ctx) {
 441                 isert_err("Failed to allocate pi context\n");
 442                 return -ENOMEM;
 443         }
 444
 445         pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
 446                                             ISCSI_ISER_SG_TABLESIZE);
 447         if (IS_ERR(pi_ctx->prot_frpl)) {
 448                 isert_err("Failed to allocate prot frpl err=%ld\n",
 449                           PTR_ERR(pi_ctx->prot_frpl));
 450                 ret = PTR_ERR(pi_ctx->prot_frpl);
 451                 goto err_pi_ctx;
 452         }
 453
 454         pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 455         if (IS_ERR(pi_ctx->prot_mr)) {
 456                 isert_err("Failed to allocate prot frmr err=%ld\n",
 457                           PTR_ERR(pi_ctx->prot_mr));
 458                 ret = PTR_ERR(pi_ctx->prot_mr);
 459                 goto err_prot_frpl;
 460         }
 461         desc->ind |= ISERT_PROT_KEY_VALID;
 462
 463         memset(&mr_init_attr, 0, sizeof(mr_init_attr));
 464         mr_init_attr.max_reg_descriptors = 2;
 465         mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 466         pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 467         if (IS_ERR(pi_ctx->sig_mr)) {
 468                 isert_err("Failed to allocate signature enabled mr err=%ld\n",
 469                           PTR_ERR(pi_ctx->sig_mr));
 470                 ret = PTR_ERR(pi_ctx->sig_mr);
 471                 goto err_prot_mr;
 472         }
 473
 474         desc->pi_ctx = pi_ctx;
 475         desc->ind |= ISERT_SIG_KEY_VALID;
 476         desc->ind &= ~ISERT_PROTECTED;
 477
 478         return 0;
 479
 480 err_prot_mr:
 481         ib_dereg_mr(desc->pi_ctx->prot_mr);
 482 err_prot_frpl:
 483         ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl);
 484 err_pi_ctx:
 485         kfree(desc->pi_ctx);
 486
 487         return ret;
 488 }
 489
 490 static int
 491 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 492                      struct fast_reg_descriptor *fr_desc)
 493 {
 494         int ret;
 495
 496         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 497                                                          ISCSI_ISER_SG_TABLESIZE);
 498         if (IS_ERR(fr_desc->data_frpl)) {
 499                 isert_err("Failed to allocate data frpl err=%ld\n",
 500                        PTR_ERR(fr_desc->data_frpl));
 501                 return PTR_ERR(fr_desc->data_frpl);
 502         }
 503
 504         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 505         if (IS_ERR(fr_desc->data_mr)) {
 506                 isert_err("Failed to allocate data frmr err=%ld\n",
 507                        PTR_ERR(fr_desc->data_mr));
 508                 ret = PTR_ERR(fr_desc->data_mr);
 509                 goto err_data_frpl;
 510         }
 511         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 512
 513         isert_dbg("Created fr_desc %p\n", fr_desc);
 514
 515         return 0;
 516
 517 err_data_frpl:
 518         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 519
 520         return ret;
 521 }
 522
 523 static int
 524 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 525 {
 526         struct fast_reg_descriptor *fr_desc;
 527         struct isert_device *device = isert_conn->conn_device;
 528         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 529         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 530         int i, ret, tag_num;
 531         /*
 532          * Setup the number of FRMRs based upon the number of tags
 533          * available to session in iscsi_target_locate_portal().
 534          */
 535         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 536         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 537
 538         isert_conn->conn_fr_pool_size = 0;
 539         for (i = 0; i < tag_num; i++) {
 540                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 541                 if (!fr_desc) {
 542                         isert_err("Failed to allocate fast_reg descriptor\n");
 543                         ret = -ENOMEM;
 544                         goto err;
 545                 }
 546
 547                 ret = isert_create_fr_desc(device->ib_device,
 548                                            isert_conn->conn_pd, fr_desc);
 549                 if (ret) {
 550                         isert_err("Failed to create fastreg descriptor err=%d\n",
 551                                ret);
 552                         kfree(fr_desc);
 553                         goto err;
 554                 }
 555
 556                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 557                 isert_conn->conn_fr_pool_size++;
 558         }
 559
 560         isert_dbg("Creating conn %p fastreg pool size=%d",
 561                  isert_conn, isert_conn->conn_fr_pool_size);
 562
 563         return 0;
 564
 565 err:
 566         isert_conn_free_fastreg_pool(isert_conn);
 567         return ret;
 568 }
 569
 570 static int
 571 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 572 {
 573         struct isert_np *isert_np = cma_id->context;
 574         struct iscsi_np *np = isert_np->np;
 575         struct isert_conn *isert_conn;
 576         struct isert_device *device;
 577         struct ib_device *ib_dev = cma_id->device;
 578         int ret = 0;
 579
 580         spin_lock_bh(&np->np_thread_lock);
 581         if (!np->enabled) {
 582                 spin_unlock_bh(&np->np_thread_lock);
 583                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 584                 return rdma_reject(cma_id, NULL, 0);
 585         }
 586         spin_unlock_bh(&np->np_thread_lock);
 587
 588         isert_dbg("Entering isert_connect_request cma_id: %p, context: %p\n",
 589                  cma_id, cma_id->context);
 590
 591         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 592         if (!isert_conn) {
 593                 isert_err("Unable to allocate isert_conn\n");
 594                 return -ENOMEM;
 595         }
 596         isert_conn->state = ISER_CONN_INIT;
 597         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 598         init_completion(&isert_conn->conn_login_comp);
 599         init_completion(&isert_conn->login_req_comp);
 600         init_completion(&isert_conn->conn_wait);
 601         kref_init(&isert_conn->conn_kref);
 602         mutex_init(&isert_conn->conn_mutex);
 603         spin_lock_init(&isert_conn->conn_lock);
 604         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 605
 606         isert_conn->conn_cm_id = cma_id;
 607
 608         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 609                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 610         if (!isert_conn->login_buf) {
 611                 isert_err("Unable to allocate isert_conn->login_buf\n");
 612                 ret = -ENOMEM;
 613                 goto out;
 614         }
 615
 616         isert_conn->login_req_buf = isert_conn->login_buf;
 617         isert_conn->login_rsp_buf = isert_conn->login_buf +
 618                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 619         isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 620                  isert_conn->login_buf, isert_conn->login_req_buf,
 621                  isert_conn->login_rsp_buf);
 622
 623         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 624                                 (void *)isert_conn->login_req_buf,
 625                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 626
 627         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 628         if (ret) {
 629                 isert_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 630                        ret);
 631                 isert_conn->login_req_dma = 0;
 632                 goto out_login_buf;
 633         }
 634
 635         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 636                                         (void *)isert_conn->login_rsp_buf,
 637                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 638
 639         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 640         if (ret) {
 641                 isert_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 642                        ret);
 643                 isert_conn->login_rsp_dma = 0;
 644                 goto out_req_dma_map;
 645         }
 646
 647         device = isert_device_find_by_ib_dev(cma_id);
 648         if (IS_ERR(device)) {
 649                 ret = PTR_ERR(device);
 650                 goto out_rsp_dma_map;
 651         }
 652
 653         /* Set max inflight RDMA READ requests */
 654         isert_conn->initiator_depth = min_t(u8,
 655                                 event->param.conn.initiator_depth,
 656                                 device->dev_attr.max_qp_init_rd_atom);
 657         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 658
 659         isert_conn->conn_device = device;
 660         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 661         if (IS_ERR(isert_conn->conn_pd)) {
 662                 ret = PTR_ERR(isert_conn->conn_pd);
 663                 isert_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 664                        isert_conn, ret);
 665                 goto out_pd;
 666         }
 667
 668         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 669                                            IB_ACCESS_LOCAL_WRITE);
 670         if (IS_ERR(isert_conn->conn_mr)) {
 671                 ret = PTR_ERR(isert_conn->conn_mr);
 672                 isert_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 673                        isert_conn, ret);
 674                 goto out_mr;
 675         }
 676
 677         ret = isert_conn_setup_qp(isert_conn, cma_id);
 678         if (ret)
 679                 goto out_conn_dev;
 680
 681         ret = isert_rdma_post_recvl(isert_conn);
 682         if (ret)
 683                 goto out_conn_dev;
 684
 685         ret = isert_rdma_accept(isert_conn);
 686         if (ret)
 687                 goto out_conn_dev;
 688
 689         mutex_lock(&isert_np->np_accept_mutex);
 690         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 691         mutex_unlock(&isert_np->np_accept_mutex);
 692
 693         isert_info("np %p: Allow accept_np to continue\n", np);
 694         up(&isert_np->np_sem);
 695         return 0;
 696
 697 out_conn_dev:
 698         ib_dereg_mr(isert_conn->conn_mr);
 699 out_mr:
 700         ib_dealloc_pd(isert_conn->conn_pd);
 701 out_pd:
 702         isert_device_try_release(device);
 703 out_rsp_dma_map:
 704         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 705                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 706 out_req_dma_map:
 707         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 708                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 709 out_login_buf:
 710         kfree(isert_conn->login_buf);
 711 out:
 712         kfree(isert_conn);
 713         rdma_reject(cma_id, NULL, 0);
 714         return ret;
 715 }
 716
 717 static void
 718 isert_connect_release(struct isert_conn *isert_conn)
 719 {
 720         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 721         struct isert_device *device = isert_conn->conn_device;
 722
 723         isert_dbg("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 724
 725         if (device && device->use_fastreg)
 726                 isert_conn_free_fastreg_pool(isert_conn);
 727
 728         isert_free_rx_descriptors(isert_conn);
 729         rdma_destroy_id(isert_conn->conn_cm_id);
 730
 731         if (isert_conn->conn_qp) {
 732                 struct isert_comp *comp = isert_conn->conn_qp->recv_cq->cq_context;
 733
 734                 isert_dbg("dec completion context %p active_qps\n", comp);
 735                 mutex_lock(&device_list_mutex);
 736                 comp->active_qps--;
 737                 mutex_unlock(&device_list_mutex);
 738
 739                 ib_destroy_qp(isert_conn->conn_qp);
 740         }
 741
 742         ib_dereg_mr(isert_conn->conn_mr);
 743         ib_dealloc_pd(isert_conn->conn_pd);
 744
 745         if (isert_conn->login_buf) {
 746                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 747                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 748                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 749                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 750                                     DMA_FROM_DEVICE);
 751                 kfree(isert_conn->login_buf);
 752         }
 753         kfree(isert_conn);
 754
 755         if (device)
 756                 isert_device_try_release(device);
 757
 758         isert_dbg("Leaving isert_connect_release >>>>>>>>>>>>\n");
 759 }
 760
 761 static void
 762 isert_connected_handler(struct rdma_cm_id *cma_id)
 763 {
 764         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 765
 766         isert_info("conn %p\n", isert_conn);
 767
 768         if (!kref_get_unless_zero(&isert_conn->conn_kref)) {
 769                 isert_warn("conn %p connect_release is running\n", isert_conn);
 770                 return;
 771         }
 772
 773         mutex_lock(&isert_conn->conn_mutex);
 774         if (isert_conn->state != ISER_CONN_FULL_FEATURE)
 775                 isert_conn->state = ISER_CONN_UP;
 776         mutex_unlock(&isert_conn->conn_mutex);
 777 }
 778
 779 static void
 780 isert_release_conn_kref(struct kref *kref)
 781 {
 782         struct isert_conn *isert_conn = container_of(kref,
 783                                 struct isert_conn, conn_kref);
 784
 785         isert_dbg("Calling isert_connect_release for final kref %s/%d\n",
 786                  current->comm, current->pid);
 787
 788         isert_connect_release(isert_conn);
 789 }
 790
 791 static void
 792 isert_put_conn(struct isert_conn *isert_conn)
 793 {
 794         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 795 }
 796
 797 /**
 798  * isert_conn_terminate() - Initiate connection termination
 799  * @isert_conn: isert connection struct
 800  *
 801  * Notes:
 802  * In case the connection state is FULL_FEATURE, move state
 803  * to TEMINATING and start teardown sequence (rdma_disconnect).
 804  * In case the connection state is UP, complete flush as well.
 805  *
 806  * This routine must be called with conn_mutex held. Thus it is
 807  * safe to call multiple times.
 808  */
 809 static void
 810 isert_conn_terminate(struct isert_conn *isert_conn)
 811 {
 812         int err;
 813
 814         switch (isert_conn->state) {
 815         case ISER_CONN_TERMINATING:
 816                 break;
 817         case ISER_CONN_UP:
 818         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 819                 isert_info("Terminating conn %p state %d\n",
 820                            isert_conn, isert_conn->state);
 821                 isert_conn->state = ISER_CONN_TERMINATING;
 822                 err = rdma_disconnect(isert_conn->conn_cm_id);
 823                 if (err)
 824                         isert_warn("Failed rdma_disconnect isert_conn %p\n",
 825                                    isert_conn);
 826                 break;
 827         default:
 828                 isert_warn("conn %p teminating in state %d\n",
 829                            isert_conn, isert_conn->state);
 830         }
 831 }
 832
 833 static int
 834 isert_np_cma_handler(struct isert_np *isert_np,
 835                      enum rdma_cm_event_type event)
 836 {
 837         isert_dbg("isert np %p, handling event %d\n", isert_np, event);
 838
 839         switch (event) {
 840         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 841                 isert_np->np_cm_id = NULL;
 842                 break;
 843         case RDMA_CM_EVENT_ADDR_CHANGE:
 844                 isert_np->np_cm_id = isert_setup_id(isert_np);
 845                 if (IS_ERR(isert_np->np_cm_id)) {
 846                         isert_err("isert np %p setup id failed: %ld\n",
 847                                   isert_np, PTR_ERR(isert_np->np_cm_id));
 848                         isert_np->np_cm_id = NULL;
 849                 }
 850                 break;
 851         default:
 852                 isert_err("isert np %p Unexpected event %d\n",
 853                           isert_np, event);
 854         }
 855
 856         return -1;
 857 }
 858
 859 static int
 860 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 861                            enum rdma_cm_event_type event)
 862 {
 863         struct isert_np *isert_np = cma_id->context;
 864         struct isert_conn *isert_conn;
 865
 866         if (isert_np->np_cm_id == cma_id)
 867                 return isert_np_cma_handler(cma_id->context, event);
 868
 869         isert_conn = cma_id->qp->qp_context;
 870
 871         mutex_lock(&isert_conn->conn_mutex);
 872         isert_conn_terminate(isert_conn);
 873         mutex_unlock(&isert_conn->conn_mutex);
 874
 875         isert_info("conn %p completing conn_wait\n", isert_conn);
 876         complete(&isert_conn->conn_wait);
 877
 878         return 0;
 879 }
 880
 881 static void
 882 isert_connect_error(struct rdma_cm_id *cma_id)
 883 {
 884         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 885
 886         isert_put_conn(isert_conn);
 887 }
 888
 889 static int
 890 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 891 {
 892         int ret = 0;
 893
 894         isert_dbg("isert_cma_handler: event %d status %d conn %p id %p\n",
 895                  event->event, event->status, cma_id->context, cma_id);
 896
 897         switch (event->event) {
 898         case RDMA_CM_EVENT_CONNECT_REQUEST:
 899                 ret = isert_connect_request(cma_id, event);
 900                 if (ret)
 901                         isert_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 902                                 event->event, ret);
 903                 break;
 904         case RDMA_CM_EVENT_ESTABLISHED:
 905                 isert_connected_handler(cma_id);
 906                 break;
 907         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 908         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 909         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 910         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 911                 ret = isert_disconnected_handler(cma_id, event->event);
 912                 break;
 913         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 914         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 915         case RDMA_CM_EVENT_CONNECT_ERROR:
 916                 isert_connect_error(cma_id);
 917                 break;
 918         default:
 919                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 920                 break;
 921         }
 922
 923         return ret;
 924 }
 925
 926 static int
 927 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 928 {
 929         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 930         int i, ret;
 931         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 932         struct iser_rx_desc *rx_desc;
 933
 934         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 935                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 936                 rx_wr->wr_id    = (uintptr_t)rx_desc;
 937                 rx_wr->sg_list  = &rx_desc->rx_sg;
 938                 rx_wr->num_sge  = 1;
 939                 rx_wr->next     = rx_wr + 1;
 940                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 941         }
 942
 943         rx_wr--;
 944         rx_wr->next = NULL; /* mark end of work requests list */
 945
 946         isert_conn->post_recv_buf_count += count;
 947         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 948                                 &rx_wr_failed);
 949         if (ret) {
 950                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
 951                 isert_conn->post_recv_buf_count -= count;
 952         } else {
 953                 isert_dbg("isert_post_recv(): Posted %d RX buffers\n", count);
 954                 isert_conn->conn_rx_desc_head = rx_head;
 955         }
 956         return ret;
 957 }
 958
 959 static int
 960 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 961 {
 962         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 963         struct ib_send_wr send_wr, *send_wr_failed;
 964         int ret;
 965
 966         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 967                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 968
 969         send_wr.next    = NULL;
 970         send_wr.wr_id   = (uintptr_t)tx_desc;
 971         send_wr.sg_list = tx_desc->tx_sg;
 972         send_wr.num_sge = tx_desc->num_sge;
 973         send_wr.opcode  = IB_WR_SEND;
 974         send_wr.send_flags = IB_SEND_SIGNALED;
 975
 976         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 977         if (ret)
 978                 isert_err("ib_post_send() failed, ret: %d\n", ret);
 979
 980         return ret;
 981 }
 982
 983 static void
 984 isert_create_send_desc(struct isert_conn *isert_conn,
 985                        struct isert_cmd *isert_cmd,
 986                        struct iser_tx_desc *tx_desc)
 987 {
 988         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 989
 990         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 991                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 992
 993         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 994         tx_desc->iser_header.flags = ISER_VER;
 995
 996         tx_desc->num_sge = 1;
 997         tx_desc->isert_cmd = isert_cmd;
 998
 999         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
1000                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
1001                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1002         }
1003 }
1004
1005 static int
1006 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1007                    struct iser_tx_desc *tx_desc)
1008 {
1009         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1010         u64 dma_addr;
1011
1012         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1013                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
1014         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1015                 isert_err("ib_dma_mapping_error() failed\n");
1016                 return -ENOMEM;
1017         }
1018
1019         tx_desc->dma_addr = dma_addr;
1020         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
1021         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1022         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
1023
1024         isert_dbg("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
1025                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
1026                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
1027
1028         return 0;
1029 }
1030
1031 static void
1032 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1033                    struct ib_send_wr *send_wr)
1034 {
1035         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1036
1037         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1038         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1039         send_wr->opcode = IB_WR_SEND;
1040         send_wr->sg_list = &tx_desc->tx_sg[0];
1041         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1042         send_wr->send_flags = IB_SEND_SIGNALED;
1043 }
1044
1045 static int
1046 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1047 {
1048         struct ib_recv_wr rx_wr, *rx_wr_fail;
1049         struct ib_sge sge;
1050         int ret;
1051
1052         memset(&sge, 0, sizeof(struct ib_sge));
1053         sge.addr = isert_conn->login_req_dma;
1054         sge.length = ISER_RX_LOGIN_SIZE;
1055         sge.lkey = isert_conn->conn_mr->lkey;
1056
1057         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1058                 sge.addr, sge.length, sge.lkey);
1059
1060         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1061         rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1062         rx_wr.sg_list = &sge;
1063         rx_wr.num_sge = 1;
1064
1065         isert_conn->post_recv_buf_count++;
1066         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1067         if (ret) {
1068                 isert_err("ib_post_recv() failed: %d\n", ret);
1069                 isert_conn->post_recv_buf_count--;
1070         }
1071
1072         isert_dbg("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1073         return ret;
1074 }
1075
1076 static int
1077 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1078                    u32 length)
1079 {
1080         struct isert_conn *isert_conn = conn->context;
1081         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1082         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1083         int ret;
1084
1085         isert_create_send_desc(isert_conn, NULL, tx_desc);
1086
1087         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1088                sizeof(struct iscsi_hdr));
1089
1090         isert_init_tx_hdrs(isert_conn, tx_desc);
1091
1092         if (length > 0) {
1093                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1094
1095                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1096                                            length, DMA_TO_DEVICE);
1097
1098                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1099
1100                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1101                                               length, DMA_TO_DEVICE);
1102
1103                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1104                 tx_dsg->length  = length;
1105                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1106                 tx_desc->num_sge = 2;
1107         }
1108         if (!login->login_failed) {
1109                 if (login->login_complete) {
1110                         if (!conn->sess->sess_ops->SessionType &&
1111                             isert_conn->conn_device->use_fastreg) {
1112                                 ret = isert_conn_create_fastreg_pool(isert_conn);
1113                                 if (ret) {
1114                                         isert_err("Conn: %p failed to create"
1115                                                " fastreg pool\n", isert_conn);
1116                                         return ret;
1117                                 }
1118                         }
1119
1120                         ret = isert_alloc_rx_descriptors(isert_conn);
1121                         if (ret)
1122                                 return ret;
1123
1124                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1125                         if (ret)
1126                                 return ret;
1127
1128                         /* Now we are in FULL_FEATURE phase */
1129                         mutex_lock(&isert_conn->conn_mutex);
1130                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1131                         mutex_unlock(&isert_conn->conn_mutex);
1132                         goto post_send;
1133                 }
1134
1135                 ret = isert_rdma_post_recvl(isert_conn);
1136                 if (ret)
1137                         return ret;
1138         }
1139 post_send:
1140         ret = isert_post_send(isert_conn, tx_desc);
1141         if (ret)
1142                 return ret;
1143
1144         return 0;
1145 }
1146
1147 static void
1148 isert_rx_login_req(struct isert_conn *isert_conn)
1149 {
1150         struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1151         int rx_buflen = isert_conn->login_req_len;
1152         struct iscsi_conn *conn = isert_conn->conn;
1153         struct iscsi_login *login = conn->conn_login;
1154         int size;
1155
1156         isert_info("conn %p\n", isert_conn);
1157
1158         WARN_ON_ONCE(!login);
1159
1160         if (login->first_request) {
1161                 struct iscsi_login_req *login_req =
1162                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1163                 /*
1164                  * Setup the initial iscsi_login values from the leading
1165                  * login request PDU.
1166                  */
1167                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1168                 login->current_stage =
1169                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1170                          >> 2;
1171                 login->version_min      = login_req->min_version;
1172                 login->version_max      = login_req->max_version;
1173                 memcpy(login->isid, login_req->isid, 6);
1174                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1175                 login->init_task_tag    = login_req->itt;
1176                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1177                 login->cid              = be16_to_cpu(login_req->cid);
1178                 login->tsih             = be16_to_cpu(login_req->tsih);
1179         }
1180
1181         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1182
1183         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1184         isert_dbg("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1185                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1186         memcpy(login->req_buf, &rx_desc->data[0], size);
1187
1188         if (login->first_request) {
1189                 complete(&isert_conn->conn_login_comp);
1190                 return;
1191         }
1192         schedule_delayed_work(&conn->login_work, 0);
1193 }
1194
1195 static struct iscsi_cmd
1196 *isert_allocate_cmd(struct iscsi_conn *conn)
1197 {
1198         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1199         struct isert_cmd *isert_cmd;
1200         struct iscsi_cmd *cmd;
1201
1202         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1203         if (!cmd) {
1204                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1205                 return NULL;
1206         }
1207         isert_cmd = iscsit_priv_cmd(cmd);
1208         isert_cmd->conn = isert_conn;
1209         isert_cmd->iscsi_cmd = cmd;
1210
1211         return cmd;
1212 }
1213
1214 static int
1215 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1216                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1217                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1218 {
1219         struct iscsi_conn *conn = isert_conn->conn;
1220         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1221         struct scatterlist *sg;
1222         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1223         bool dump_payload = false;
1224
1225         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1226         if (rc < 0)
1227                 return rc;
1228
1229         imm_data = cmd->immediate_data;
1230         imm_data_len = cmd->first_burst_len;
1231         unsol_data = cmd->unsolicited_data;
1232
1233         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1234         if (rc < 0) {
1235                 return 0;
1236         } else if (rc > 0) {
1237                 dump_payload = true;
1238                 goto sequence_cmd;
1239         }
1240
1241         if (!imm_data)
1242                 return 0;
1243
1244         sg = &cmd->se_cmd.t_data_sg[0];
1245         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1246
1247         isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1248                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1249
1250         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1251
1252         cmd->write_data_done += imm_data_len;
1253
1254         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1255                 spin_lock_bh(&cmd->istate_lock);
1256                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1257                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1258                 spin_unlock_bh(&cmd->istate_lock);
1259         }
1260
1261 sequence_cmd:
1262         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1263
1264         if (!rc && dump_payload == false && unsol_data)
1265                 iscsit_set_unsoliticed_dataout(cmd);
1266         else if (dump_payload && imm_data)
1267                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1268
1269         return 0;
1270 }
1271
1272 static int
1273 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1274                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1275 {
1276         struct scatterlist *sg_start;
1277         struct iscsi_conn *conn = isert_conn->conn;
1278         struct iscsi_cmd *cmd = NULL;
1279         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1280         u32 unsol_data_len = ntoh24(hdr->dlength);
1281         int rc, sg_nents, sg_off, page_off;
1282
1283         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1284         if (rc < 0)
1285                 return rc;
1286         else if (!cmd)
1287                 return 0;
1288         /*
1289          * FIXME: Unexpected unsolicited_data out
1290          */
1291         if (!cmd->unsolicited_data) {
1292                 isert_err("Received unexpected solicited data payload\n");
1293                 dump_stack();
1294                 return -1;
1295         }
1296
1297         isert_dbg("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1298                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1299
1300         sg_off = cmd->write_data_done / PAGE_SIZE;
1301         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1302         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1303         page_off = cmd->write_data_done % PAGE_SIZE;
1304         /*
1305          * FIXME: Non page-aligned unsolicited_data out
1306          */
1307         if (page_off) {
1308                 isert_err("Received unexpected non-page aligned data payload\n");
1309                 dump_stack();
1310                 return -1;
1311         }
1312         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1313                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1314
1315         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1316                             unsol_data_len);
1317
1318         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1319         if (rc < 0)
1320                 return rc;
1321
1322         return 0;
1323 }
1324
1325 static int
1326 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1327                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1328                      unsigned char *buf)
1329 {
1330         struct iscsi_conn *conn = isert_conn->conn;
1331         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1332         int rc;
1333
1334         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1335         if (rc < 0)
1336                 return rc;
1337         /*
1338          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1339          */
1340
1341         return iscsit_process_nop_out(conn, cmd, hdr);
1342 }
1343
1344 static int
1345 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1346                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1347                       struct iscsi_text *hdr)
1348 {
1349         struct iscsi_conn *conn = isert_conn->conn;
1350         u32 payload_length = ntoh24(hdr->dlength);
1351         int rc;
1352         unsigned char *text_in;
1353
1354         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1355         if (rc < 0)
1356                 return rc;
1357
1358         text_in = kzalloc(payload_length, GFP_KERNEL);
1359         if (!text_in) {
1360                 isert_err("Unable to allocate text_in of payload_length: %u\n",
1361                        payload_length);
1362                 return -ENOMEM;
1363         }
1364         cmd->text_in_ptr = text_in;
1365
1366         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1367
1368         return iscsit_process_text_cmd(conn, cmd, hdr);
1369 }
1370
1371 static int
1372 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1373                 uint32_t read_stag, uint64_t read_va,
1374                 uint32_t write_stag, uint64_t write_va)
1375 {
1376         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1377         struct iscsi_conn *conn = isert_conn->conn;
1378         struct iscsi_session *sess = conn->sess;
1379         struct iscsi_cmd *cmd;
1380         struct isert_cmd *isert_cmd;
1381         int ret = -EINVAL;
1382         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1383
1384         if (sess->sess_ops->SessionType &&
1385            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1386                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1387                        " ignoring\n", opcode);
1388                 return 0;
1389         }
1390
1391         switch (opcode) {
1392         case ISCSI_OP_SCSI_CMD:
1393                 cmd = isert_allocate_cmd(conn);
1394                 if (!cmd)
1395                         break;
1396
1397                 isert_cmd = iscsit_priv_cmd(cmd);
1398                 isert_cmd->read_stag = read_stag;
1399                 isert_cmd->read_va = read_va;
1400                 isert_cmd->write_stag = write_stag;
1401                 isert_cmd->write_va = write_va;
1402
1403                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1404                                         rx_desc, (unsigned char *)hdr);
1405                 break;
1406         case ISCSI_OP_NOOP_OUT:
1407                 cmd = isert_allocate_cmd(conn);
1408                 if (!cmd)
1409                         break;
1410
1411                 isert_cmd = iscsit_priv_cmd(cmd);
1412                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1413                                            rx_desc, (unsigned char *)hdr);
1414                 break;
1415         case ISCSI_OP_SCSI_DATA_OUT:
1416                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1417                                                 (unsigned char *)hdr);
1418                 break;
1419         case ISCSI_OP_SCSI_TMFUNC:
1420                 cmd = isert_allocate_cmd(conn);
1421                 if (!cmd)
1422                         break;
1423
1424                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1425                                                 (unsigned char *)hdr);
1426                 break;
1427         case ISCSI_OP_LOGOUT:
1428                 cmd = isert_allocate_cmd(conn);
1429                 if (!cmd)
1430                         break;
1431
1432                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1433                 break;
1434         case ISCSI_OP_TEXT:
1435                 cmd = isert_allocate_cmd(conn);
1436                 if (!cmd)
1437                         break;
1438
1439                 isert_cmd = iscsit_priv_cmd(cmd);
1440                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1441                                             rx_desc, (struct iscsi_text *)hdr);
1442                 break;
1443         default:
1444                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1445                 dump_stack();
1446                 break;
1447         }
1448
1449         return ret;
1450 }
1451
1452 static void
1453 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1454 {
1455         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1456         uint64_t read_va = 0, write_va = 0;
1457         uint32_t read_stag = 0, write_stag = 0;
1458         int rc;
1459
1460         switch (iser_hdr->flags & 0xF0) {
1461         case ISCSI_CTRL:
1462                 if (iser_hdr->flags & ISER_RSV) {
1463                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1464                         read_va = be64_to_cpu(iser_hdr->read_va);
1465                         isert_dbg("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1466                                  read_stag, (unsigned long long)read_va);
1467                 }
1468                 if (iser_hdr->flags & ISER_WSV) {
1469                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1470                         write_va = be64_to_cpu(iser_hdr->write_va);
1471                         isert_dbg("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1472                                  write_stag, (unsigned long long)write_va);
1473                 }
1474
1475                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1476                 break;
1477         case ISER_HELLO:
1478                 isert_err("iSER Hello message\n");
1479                 break;
1480         default:
1481                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1482                 break;
1483         }
1484
1485         rc = isert_rx_opcode(isert_conn, rx_desc,
1486                              read_stag, read_va, write_stag, write_va);
1487 }
1488
1489 static void
1490 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1491                     u32 xfer_len)
1492 {
1493         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1494         struct iscsi_hdr *hdr;
1495         u64 rx_dma;
1496         int rx_buflen, outstanding;
1497
1498         if ((char *)desc == isert_conn->login_req_buf) {
1499                 rx_dma = isert_conn->login_req_dma;
1500                 rx_buflen = ISER_RX_LOGIN_SIZE;
1501                 isert_dbg("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1502                          rx_dma, rx_buflen);
1503         } else {
1504                 rx_dma = desc->dma_addr;
1505                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1506                 isert_dbg("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1507                          rx_dma, rx_buflen);
1508         }
1509
1510         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1511
1512         hdr = &desc->iscsi_header;
1513         isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1514                  hdr->opcode, hdr->itt, hdr->flags,
1515                  (int)(xfer_len - ISER_HEADERS_LEN));
1516
1517         if ((char *)desc == isert_conn->login_req_buf) {
1518                 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1519                 if (isert_conn->conn) {
1520                         struct iscsi_login *login = isert_conn->conn->conn_login;
1521
1522                         if (login && !login->first_request)
1523                                 isert_rx_login_req(isert_conn);
1524                 }
1525                 mutex_lock(&isert_conn->conn_mutex);
1526                 complete(&isert_conn->login_req_comp);
1527                 mutex_unlock(&isert_conn->conn_mutex);
1528         } else {
1529                 isert_rx_do_work(desc, isert_conn);
1530         }
1531
1532         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1533                                       DMA_FROM_DEVICE);
1534
1535         isert_conn->post_recv_buf_count--;
1536         isert_dbg("iSERT: Decremented post_recv_buf_count: %d\n",
1537                  isert_conn->post_recv_buf_count);
1538
1539         if ((char *)desc == isert_conn->login_req_buf)
1540                 return;
1541
1542         outstanding = isert_conn->post_recv_buf_count;
1543         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1544                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1545                                 ISERT_MIN_POSTED_RX);
1546                 err = isert_post_recv(isert_conn, count);
1547                 if (err) {
1548                         isert_err("isert_post_recv() count: %d failed, %d\n",
1549                                count, err);
1550                 }
1551         }
1552 }
1553
1554 static int
1555 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1556                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1557                    enum iser_ib_op_code op, struct isert_data_buf *data)
1558 {
1559         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1560
1561         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1562                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1563
1564         data->len = length - offset;
1565         data->offset = offset;
1566         data->sg_off = data->offset / PAGE_SIZE;
1567
1568         data->sg = &sg[data->sg_off];
1569         data->nents = min_t(unsigned int, nents - data->sg_off,
1570                                           ISCSI_ISER_SG_TABLESIZE);
1571         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1572                                         PAGE_SIZE);
1573
1574         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1575                                         data->dma_dir);
1576         if (unlikely(!data->dma_nents)) {
1577                 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1578                 return -EINVAL;
1579         }
1580
1581         isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1582                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1583
1584         return 0;
1585 }
1586
1587 static void
1588 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1589 {
1590         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1591
1592         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1593         memset(data, 0, sizeof(*data));
1594 }
1595
1596
1597
1598 static void
1599 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1600 {
1601         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1602
1603         isert_dbg("isert_unmap_cmd: %p\n", isert_cmd);
1604
1605         if (wr->data.sg) {
1606                 isert_dbg("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1607                 isert_unmap_data_buf(isert_conn, &wr->data);
1608         }
1609
1610         if (wr->send_wr) {
1611                 isert_dbg("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1612                 kfree(wr->send_wr);
1613                 wr->send_wr = NULL;
1614         }
1615
1616         if (wr->ib_sge) {
1617                 isert_dbg("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1618                 kfree(wr->ib_sge);
1619                 wr->ib_sge = NULL;
1620         }
1621 }
1622
1623 static void
1624 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1625 {
1626         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1627         LIST_HEAD(unmap_list);
1628
1629         isert_dbg("unreg_fastreg_cmd: %p\n", isert_cmd);
1630
1631         if (wr->fr_desc) {
1632                 isert_dbg("unreg_fastreg_cmd: %p free fr_desc %p\n",
1633                          isert_cmd, wr->fr_desc);
1634                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1635                         isert_unmap_data_buf(isert_conn, &wr->prot);
1636                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1637                 }
1638                 spin_lock_bh(&isert_conn->conn_lock);
1639                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1640                 spin_unlock_bh(&isert_conn->conn_lock);
1641                 wr->fr_desc = NULL;
1642         }
1643
1644         if (wr->data.sg) {
1645                 isert_dbg("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1646                 isert_unmap_data_buf(isert_conn, &wr->data);
1647         }
1648
1649         wr->ib_sge = NULL;
1650         wr->send_wr = NULL;
1651 }
1652
1653 static void
1654 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1655 {
1656         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1657         struct isert_conn *isert_conn = isert_cmd->conn;
1658         struct iscsi_conn *conn = isert_conn->conn;
1659         struct isert_device *device = isert_conn->conn_device;
1660
1661         isert_dbg("Entering isert_put_cmd: %p\n", isert_cmd);
1662
1663         switch (cmd->iscsi_opcode) {
1664         case ISCSI_OP_SCSI_CMD:
1665                 spin_lock_bh(&conn->cmd_lock);
1666                 if (!list_empty(&cmd->i_conn_node))
1667                         list_del_init(&cmd->i_conn_node);
1668                 spin_unlock_bh(&conn->cmd_lock);
1669
1670                 if (cmd->data_direction == DMA_TO_DEVICE) {
1671                         iscsit_stop_dataout_timer(cmd);
1672                         /*
1673                          * Check for special case during comp_err where
1674                          * WRITE_PENDING has been handed off from core,
1675                          * but requires an extra target_put_sess_cmd()
1676                          * before transport_generic_free_cmd() below.
1677                          */
1678                         if (comp_err &&
1679                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1680                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1681
1682                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1683                         }
1684                 }
1685
1686                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1687                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1688                 break;
1689         case ISCSI_OP_SCSI_TMFUNC:
1690                 spin_lock_bh(&conn->cmd_lock);
1691                 if (!list_empty(&cmd->i_conn_node))
1692                         list_del_init(&cmd->i_conn_node);
1693                 spin_unlock_bh(&conn->cmd_lock);
1694
1695                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1696                 break;
1697         case ISCSI_OP_REJECT:
1698         case ISCSI_OP_NOOP_OUT:
1699         case ISCSI_OP_TEXT:
1700                 spin_lock_bh(&conn->cmd_lock);
1701                 if (!list_empty(&cmd->i_conn_node))
1702                         list_del_init(&cmd->i_conn_node);
1703                 spin_unlock_bh(&conn->cmd_lock);
1704
1705                 /*
1706                  * Handle special case for REJECT when iscsi_add_reject*() has
1707                  * overwritten the original iscsi_opcode assignment, and the
1708                  * associated cmd->se_cmd needs to be released.
1709                  */
1710                 if (cmd->se_cmd.se_tfo != NULL) {
1711                         isert_dbg("Calling transport_generic_free_cmd from"
1712                                  " isert_put_cmd for 0x%02x\n",
1713                                  cmd->iscsi_opcode);
1714                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1715                         break;
1716                 }
1717                 /*
1718                  * Fall-through
1719                  */
1720         default:
1721                 iscsit_release_cmd(cmd);
1722                 break;
1723         }
1724 }
1725
1726 static void
1727 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1728 {
1729         if (tx_desc->dma_addr != 0) {
1730                 isert_dbg("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1731                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1732                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1733                 tx_desc->dma_addr = 0;
1734         }
1735 }
1736
1737 static void
1738 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1739                      struct ib_device *ib_dev, bool comp_err)
1740 {
1741         if (isert_cmd->pdu_buf_dma != 0) {
1742                 isert_dbg("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1743                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1744                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1745                 isert_cmd->pdu_buf_dma = 0;
1746         }
1747
1748         isert_unmap_tx_desc(tx_desc, ib_dev);
1749         isert_put_cmd(isert_cmd, comp_err);
1750 }
1751
1752 static int
1753 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1754 {
1755         struct ib_mr_status mr_status;
1756         int ret;
1757
1758         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1759         if (ret) {
1760                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1761                 goto fail_mr_status;
1762         }
1763
1764         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1765                 u64 sec_offset_err;
1766                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1767
1768                 switch (mr_status.sig_err.err_type) {
1769                 case IB_SIG_BAD_GUARD:
1770                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1771                         break;
1772                 case IB_SIG_BAD_REFTAG:
1773                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1774                         break;
1775                 case IB_SIG_BAD_APPTAG:
1776                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1777                         break;
1778                 }
1779                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1780                 do_div(sec_offset_err, block_size);
1781                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1782
1783                 isert_err("isert: PI error found type %d at sector 0x%llx "
1784                        "expected 0x%x vs actual 0x%x\n",
1785                        mr_status.sig_err.err_type,
1786                        (unsigned long long)se_cmd->bad_sector,
1787                        mr_status.sig_err.expected,
1788                        mr_status.sig_err.actual);
1789                 ret = 1;
1790         }
1791
1792 fail_mr_status:
1793         return ret;
1794 }
1795
1796 static void
1797 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1798                             struct isert_cmd *isert_cmd)
1799 {
1800         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1801         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1802         struct se_cmd *se_cmd = &cmd->se_cmd;
1803         struct isert_conn *isert_conn = isert_cmd->conn;
1804         struct isert_device *device = isert_conn->conn_device;
1805         int ret = 0;
1806
1807         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1808                 ret = isert_check_pi_status(se_cmd,
1809                                             wr->fr_desc->pi_ctx->sig_mr);
1810                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1811         }
1812
1813         device->unreg_rdma_mem(isert_cmd, isert_conn);
1814         wr->send_wr_num = 0;
1815         if (ret)
1816                 transport_send_check_condition_and_sense(se_cmd,
1817                                                          se_cmd->pi_err, 0);
1818         else
1819                 isert_put_response(isert_conn->conn, cmd);
1820 }
1821
1822 static void
1823 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1824                            struct isert_cmd *isert_cmd)
1825 {
1826         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1827         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1828         struct se_cmd *se_cmd = &cmd->se_cmd;
1829         struct isert_conn *isert_conn = isert_cmd->conn;
1830         struct isert_device *device = isert_conn->conn_device;
1831         int ret = 0;
1832
1833         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1834                 ret = isert_check_pi_status(se_cmd,
1835                                             wr->fr_desc->pi_ctx->sig_mr);
1836                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1837         }
1838
1839         iscsit_stop_dataout_timer(cmd);
1840         device->unreg_rdma_mem(isert_cmd, isert_conn);
1841         cmd->write_data_done = wr->data.len;
1842         wr->send_wr_num = 0;
1843
1844         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1845         spin_lock_bh(&cmd->istate_lock);
1846         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1847         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1848         spin_unlock_bh(&cmd->istate_lock);
1849
1850         if (ret)
1851                 transport_send_check_condition_and_sense(se_cmd,
1852                                                          se_cmd->pi_err, 0);
1853         else
1854                 target_execute_cmd(se_cmd);
1855 }
1856
1857 static void
1858 isert_do_control_comp(struct work_struct *work)
1859 {
1860         struct isert_cmd *isert_cmd = container_of(work,
1861                         struct isert_cmd, comp_work);
1862         struct isert_conn *isert_conn = isert_cmd->conn;
1863         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1864         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1865
1866         switch (cmd->i_state) {
1867         case ISTATE_SEND_TASKMGTRSP:
1868                 isert_dbg("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1869
1870                 iscsit_tmr_post_handler(cmd, cmd->conn);
1871
1872                 cmd->i_state = ISTATE_SENT_STATUS;
1873                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1874                 break;
1875         case ISTATE_SEND_REJECT:
1876                 isert_dbg("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1877
1878                 cmd->i_state = ISTATE_SENT_STATUS;
1879                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1880                 break;
1881         case ISTATE_SEND_LOGOUTRSP:
1882                 isert_dbg("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1883
1884                 iscsit_logout_post_handler(cmd, cmd->conn);
1885                 break;
1886         case ISTATE_SEND_TEXTRSP:
1887                 cmd->i_state = ISTATE_SENT_STATUS;
1888                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1889                 break;
1890         default:
1891                 isert_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1892                 dump_stack();
1893                 break;
1894         }
1895 }
1896
1897 static void
1898 isert_response_completion(struct iser_tx_desc *tx_desc,
1899                           struct isert_cmd *isert_cmd,
1900                           struct isert_conn *isert_conn,
1901                           struct ib_device *ib_dev)
1902 {
1903         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1904
1905         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1906             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1907             cmd->i_state == ISTATE_SEND_REJECT ||
1908             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1909                 isert_unmap_tx_desc(tx_desc, ib_dev);
1910
1911                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1912                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1913                 return;
1914         }
1915
1916         cmd->i_state = ISTATE_SENT_STATUS;
1917         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1918 }
1919
1920 static void
1921 isert_send_completion(struct iser_tx_desc *tx_desc,
1922                       struct isert_conn *isert_conn)
1923 {
1924         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1925         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1926         struct isert_rdma_wr *wr;
1927
1928         if (!isert_cmd) {
1929                 isert_unmap_tx_desc(tx_desc, ib_dev);
1930                 return;
1931         }
1932         wr = &isert_cmd->rdma_wr;
1933
1934         switch (wr->iser_ib_op) {
1935         case ISER_IB_RECV:
1936                 isert_err("isert_send_completion: Got ISER_IB_RECV\n");
1937                 dump_stack();
1938                 break;
1939         case ISER_IB_SEND:
1940                 isert_dbg("isert_send_completion: Got ISER_IB_SEND\n");
1941                 isert_response_completion(tx_desc, isert_cmd,
1942                                           isert_conn, ib_dev);
1943                 break;
1944         case ISER_IB_RDMA_WRITE:
1945                 isert_dbg("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1946                 isert_completion_rdma_write(tx_desc, isert_cmd);
1947                 break;
1948         case ISER_IB_RDMA_READ:
1949                 isert_dbg("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1950
1951                 isert_completion_rdma_read(tx_desc, isert_cmd);
1952                 break;
1953         default:
1954                 isert_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1955                 dump_stack();
1956                 break;
1957         }
1958 }
1959
1960 /**
1961  * is_isert_tx_desc() - Indicate if the completion wr_id
1962  *     is a TX descriptor or not.
1963  * @isert_conn: iser connection
1964  * @wr_id: completion WR identifier
1965  *
1966  * Since we cannot rely on wc opcode in FLUSH errors
1967  * we must work around it by checking if the wr_id address
1968  * falls in the iser connection rx_descs buffer. If so
1969  * it is an RX descriptor, otherwize it is a TX.
1970  */
1971 static inline bool
1972 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
1973 {
1974         void *start = isert_conn->conn_rx_descs;
1975         int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->conn_rx_descs);
1976
1977         if (wr_id >= start && wr_id < start + len)
1978                 return false;
1979
1980         return true;
1981 }
1982
1983 static void
1984 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
1985 {
1986         if (wc->wr_id == ISER_BEACON_WRID) {
1987                 isert_info("conn %p completing conn_wait_comp_err\n",
1988                            isert_conn);
1989                 complete(&isert_conn->conn_wait_comp_err);
1990         } else
1991         if (is_isert_tx_desc(isert_conn, (void *)wc->wr_id)) {
1992                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1993                 struct isert_cmd *isert_cmd;
1994                 struct iser_tx_desc *desc;
1995
1996                 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
1997                 isert_cmd = desc->isert_cmd;
1998                 if (!isert_cmd)
1999                         isert_unmap_tx_desc(desc, ib_dev);
2000                 else
2001                         isert_completion_put(desc, isert_cmd, ib_dev, true);
2002         } else {
2003                 isert_conn->post_recv_buf_count--;
2004                 if (!isert_conn->post_recv_buf_count)
2005                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2006         }
2007 }
2008
2009 static void
2010 isert_handle_wc(struct ib_wc *wc)
2011 {
2012         struct isert_conn *isert_conn;
2013         struct iser_tx_desc *tx_desc;
2014         struct iser_rx_desc *rx_desc;
2015
2016         isert_conn = wc->qp->qp_context;
2017         if (likely(wc->status == IB_WC_SUCCESS)) {
2018                 if (wc->opcode == IB_WC_RECV) {
2019                         rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2020                         isert_rx_completion(rx_desc, isert_conn, wc->byte_len);
2021                 } else {
2022                         tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2023                         isert_send_completion(tx_desc, isert_conn);
2024                 }
2025         } else {
2026                 if (wc->status != IB_WC_WR_FLUSH_ERR)
2027                         isert_err("wr id %llx status %d vend_err %x\n",
2028                                   wc->wr_id, wc->status, wc->vendor_err);
2029                 else
2030                         isert_dbg("flush error: wr id %llx\n", wc->wr_id);
2031
2032                 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2033                         isert_cq_comp_err(isert_conn, wc);
2034         }
2035 }
2036
2037 static void
2038 isert_cq_work(struct work_struct *work)
2039 {
2040         enum { isert_poll_budget = 65536 };
2041         struct isert_comp *comp = container_of(work, struct isert_comp,
2042                                                work);
2043         struct ib_wc *const wcs = comp->wcs;
2044         int i, n, completed = 0;
2045
2046         while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2047                 for (i = 0; i < n; i++)
2048                         isert_handle_wc(&wcs[i]);
2049
2050                 completed += n;
2051                 if (completed >= isert_poll_budget)
2052                         break;
2053         }
2054
2055         ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2056 }
2057
2058 static void
2059 isert_cq_callback(struct ib_cq *cq, void *context)
2060 {
2061         struct isert_comp *comp = context;
2062
2063         queue_work(isert_comp_wq, &comp->work);
2064 }
2065
2066 static int
2067 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2068 {
2069         struct ib_send_wr *wr_failed;
2070         int ret;
2071
2072         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2073                            &wr_failed);
2074         if (ret) {
2075                 isert_err("ib_post_send failed with %d\n", ret);
2076                 return ret;
2077         }
2078         return ret;
2079 }
2080
2081 static int
2082 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2083 {
2084         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2085         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2086         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2087         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2088                                 &isert_cmd->tx_desc.iscsi_header;
2089
2090         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2091         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2092         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2093         /*
2094          * Attach SENSE DATA payload to iSCSI Response PDU
2095          */
2096         if (cmd->se_cmd.sense_buffer &&
2097             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2098             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2099                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2100                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2101                 u32 padding, pdu_len;
2102
2103                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2104                                    cmd->sense_buffer);
2105                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2106
2107                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2108                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2109                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2110
2111                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2112                                 (void *)cmd->sense_buffer, pdu_len,
2113                                 DMA_TO_DEVICE);
2114
2115                 isert_cmd->pdu_buf_len = pdu_len;
2116                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2117                 tx_dsg->length  = pdu_len;
2118                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2119                 isert_cmd->tx_desc.num_sge = 2;
2120         }
2121
2122         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2123
2124         isert_dbg("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2125
2126         return isert_post_response(isert_conn, isert_cmd);
2127 }
2128
2129 static void
2130 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2131 {
2132         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2133         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2134         struct isert_device *device = isert_conn->conn_device;
2135
2136         spin_lock_bh(&conn->cmd_lock);
2137         if (!list_empty(&cmd->i_conn_node))
2138                 list_del_init(&cmd->i_conn_node);
2139         spin_unlock_bh(&conn->cmd_lock);
2140
2141         if (cmd->data_direction == DMA_TO_DEVICE)
2142                 iscsit_stop_dataout_timer(cmd);
2143
2144         device->unreg_rdma_mem(isert_cmd, isert_conn);
2145 }
2146
2147 static enum target_prot_op
2148 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2149 {
2150         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2151         struct isert_device *device = isert_conn->conn_device;
2152
2153         if (conn->tpg->tpg_attrib.t10_pi) {
2154                 if (device->pi_capable) {
2155                         isert_info("conn %p PI offload enabled\n", isert_conn);
2156                         isert_conn->pi_support = true;
2157                         return TARGET_PROT_ALL;
2158                 }
2159         }
2160
2161         isert_info("conn %p PI offload disabled\n", isert_conn);
2162         isert_conn->pi_support = false;
2163
2164         return TARGET_PROT_NORMAL;
2165 }
2166
2167 static int
2168 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2169                 bool nopout_response)
2170 {
2171         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2172         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2173         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2174
2175         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2176         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2177                                &isert_cmd->tx_desc.iscsi_header,
2178                                nopout_response);
2179         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2180         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2181
2182         isert_dbg("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2183
2184         return isert_post_response(isert_conn, isert_cmd);
2185 }
2186
2187 static int
2188 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2189 {
2190         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2191         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2192         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2193
2194         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2195         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2196                                 &isert_cmd->tx_desc.iscsi_header);
2197         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2198         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2199
2200         isert_dbg("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2201
2202         return isert_post_response(isert_conn, isert_cmd);
2203 }
2204
2205 static int
2206 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2207 {
2208         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2209         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2210         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2211
2212         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2213         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2214                                   &isert_cmd->tx_desc.iscsi_header);
2215         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2216         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2217
2218         isert_dbg("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2219
2220         return isert_post_response(isert_conn, isert_cmd);
2221 }
2222
2223 static int
2224 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2225 {
2226         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2227         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2228         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2229         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2230         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2231         struct iscsi_reject *hdr =
2232                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2233
2234         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2235         iscsit_build_reject(cmd, conn, hdr);
2236         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2237
2238         hton24(hdr->dlength, ISCSI_HDR_LEN);
2239         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2240                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2241                         DMA_TO_DEVICE);
2242         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2243         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2244         tx_dsg->length  = ISCSI_HDR_LEN;
2245         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2246         isert_cmd->tx_desc.num_sge = 2;
2247
2248         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2249
2250         isert_dbg("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2251
2252         return isert_post_response(isert_conn, isert_cmd);
2253 }
2254
2255 static int
2256 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2257 {
2258         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2259         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2260         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2261         struct iscsi_text_rsp *hdr =
2262                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2263         u32 txt_rsp_len;
2264         int rc;
2265
2266         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2267         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2268         if (rc < 0)
2269                 return rc;
2270
2271         txt_rsp_len = rc;
2272         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2273
2274         if (txt_rsp_len) {
2275                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2276                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2277                 void *txt_rsp_buf = cmd->buf_ptr;
2278
2279                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2280                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2281
2282                 isert_cmd->pdu_buf_len = txt_rsp_len;
2283                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2284                 tx_dsg->length  = txt_rsp_len;
2285                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2286                 isert_cmd->tx_desc.num_sge = 2;
2287         }
2288         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2289
2290         isert_dbg("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2291
2292         return isert_post_response(isert_conn, isert_cmd);
2293 }
2294
2295 static int
2296 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2297                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2298                     u32 data_left, u32 offset)
2299 {
2300         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2301         struct scatterlist *sg_start, *tmp_sg;
2302         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2303         u32 sg_off, page_off;
2304         int i = 0, sg_nents;
2305
2306         sg_off = offset / PAGE_SIZE;
2307         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2308         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2309         page_off = offset % PAGE_SIZE;
2310
2311         send_wr->sg_list = ib_sge;
2312         send_wr->num_sge = sg_nents;
2313         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2314         /*
2315          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2316          */
2317         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2318                 isert_dbg("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2319                          (unsigned long long)tmp_sg->dma_address,
2320                          tmp_sg->length, page_off);
2321
2322                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2323                 ib_sge->length = min_t(u32, data_left,
2324                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2325                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2326
2327                 isert_dbg("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2328                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2329                 page_off = 0;
2330                 data_left -= ib_sge->length;
2331                 ib_sge++;
2332                 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2333         }
2334
2335         isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2336                  send_wr->sg_list, send_wr->num_sge);
2337
2338         return sg_nents;
2339 }
2340
2341 static int
2342 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2343                struct isert_rdma_wr *wr)
2344 {
2345         struct se_cmd *se_cmd = &cmd->se_cmd;
2346         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2347         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2348         struct isert_data_buf *data = &wr->data;
2349         struct ib_send_wr *send_wr;
2350         struct ib_sge *ib_sge;
2351         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2352         int ret = 0, i, ib_sge_cnt;
2353
2354         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2355
2356         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2357         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2358                                  se_cmd->t_data_nents, se_cmd->data_length,
2359                                  offset, wr->iser_ib_op, &wr->data);
2360         if (ret)
2361                 return ret;
2362
2363         data_left = data->len;
2364         offset = data->offset;
2365
2366         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2367         if (!ib_sge) {
2368                 isert_warn("Unable to allocate ib_sge\n");
2369                 ret = -ENOMEM;
2370                 goto unmap_cmd;
2371         }
2372         wr->ib_sge = ib_sge;
2373
2374         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2375         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2376                                 GFP_KERNEL);
2377         if (!wr->send_wr) {
2378                 isert_dbg("Unable to allocate wr->send_wr\n");
2379                 ret = -ENOMEM;
2380                 goto unmap_cmd;
2381         }
2382
2383         wr->isert_cmd = isert_cmd;
2384         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2385
2386         for (i = 0; i < wr->send_wr_num; i++) {
2387                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2388                 data_len = min(data_left, rdma_write_max);
2389
2390                 send_wr->send_flags = 0;
2391                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2392                         send_wr->opcode = IB_WR_RDMA_WRITE;
2393                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2394                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2395                         if (i + 1 == wr->send_wr_num)
2396                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2397                         else
2398                                 send_wr->next = &wr->send_wr[i + 1];
2399                 } else {
2400                         send_wr->opcode = IB_WR_RDMA_READ;
2401                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2402                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2403                         if (i + 1 == wr->send_wr_num)
2404                                 send_wr->send_flags = IB_SEND_SIGNALED;
2405                         else
2406                                 send_wr->next = &wr->send_wr[i + 1];
2407                 }
2408
2409                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2410                                         send_wr, data_len, offset);
2411                 ib_sge += ib_sge_cnt;
2412
2413                 offset += data_len;
2414                 va_offset += data_len;
2415                 data_left -= data_len;
2416         }
2417
2418         return 0;
2419 unmap_cmd:
2420         isert_unmap_data_buf(isert_conn, data);
2421
2422         return ret;
2423 }
2424
2425 static int
2426 isert_map_fr_pagelist(struct ib_device *ib_dev,
2427                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2428 {
2429         u64 start_addr, end_addr, page, chunk_start = 0;
2430         struct scatterlist *tmp_sg;
2431         int i = 0, new_chunk, last_ent, n_pages;
2432
2433         n_pages = 0;
2434         new_chunk = 1;
2435         last_ent = sg_nents - 1;
2436         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2437                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2438                 if (new_chunk)
2439                         chunk_start = start_addr;
2440                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2441
2442                 isert_dbg("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2443                          i, (unsigned long long)tmp_sg->dma_address,
2444                          tmp_sg->length);
2445
2446                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2447                         new_chunk = 0;
2448                         continue;
2449                 }
2450                 new_chunk = 1;
2451
2452                 page = chunk_start & PAGE_MASK;
2453                 do {
2454                         fr_pl[n_pages++] = page;
2455                         isert_dbg("Mapped page_list[%d] page_addr: 0x%16llx\n",
2456                                  n_pages - 1, page);
2457                         page += PAGE_SIZE;
2458                 } while (page < end_addr);
2459         }
2460
2461         return n_pages;
2462 }
2463
2464 static int
2465 isert_fast_reg_mr(struct isert_conn *isert_conn,
2466                   struct fast_reg_descriptor *fr_desc,
2467                   struct isert_data_buf *mem,
2468                   enum isert_indicator ind,
2469                   struct ib_sge *sge)
2470 {
2471         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2472         struct ib_mr *mr;
2473         struct ib_fast_reg_page_list *frpl;
2474         struct ib_send_wr fr_wr, inv_wr;
2475         struct ib_send_wr *bad_wr, *wr = NULL;
2476         int ret, pagelist_len;
2477         u32 page_off;
2478         u8 key;
2479
2480         if (mem->dma_nents == 1) {
2481                 sge->lkey = isert_conn->conn_mr->lkey;
2482                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2483                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2484                 isert_dbg("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2485                          __func__, __LINE__, sge->addr, sge->length,
2486                          sge->lkey);
2487                 return 0;
2488         }
2489
2490         if (ind == ISERT_DATA_KEY_VALID) {
2491                 /* Registering data buffer */
2492                 mr = fr_desc->data_mr;
2493                 frpl = fr_desc->data_frpl;
2494         } else {
2495                 /* Registering protection buffer */
2496                 mr = fr_desc->pi_ctx->prot_mr;
2497                 frpl = fr_desc->pi_ctx->prot_frpl;
2498         }
2499
2500         page_off = mem->offset % PAGE_SIZE;
2501
2502         isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2503                  fr_desc, mem->nents, mem->offset);
2504
2505         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2506                                              &frpl->page_list[0]);
2507
2508         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2509                 memset(&inv_wr, 0, sizeof(inv_wr));
2510                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2511                 inv_wr.opcode = IB_WR_LOCAL_INV;
2512                 inv_wr.ex.invalidate_rkey = mr->rkey;
2513                 wr = &inv_wr;
2514                 /* Bump the key */
2515                 key = (u8)(mr->rkey & 0x000000FF);
2516                 ib_update_fast_reg_key(mr, ++key);
2517         }
2518
2519         /* Prepare FASTREG WR */
2520         memset(&fr_wr, 0, sizeof(fr_wr));
2521         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2522         fr_wr.opcode = IB_WR_FAST_REG_MR;
2523         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2524         fr_wr.wr.fast_reg.page_list = frpl;
2525         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2526         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2527         fr_wr.wr.fast_reg.length = mem->len;
2528         fr_wr.wr.fast_reg.rkey = mr->rkey;
2529         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2530
2531         if (!wr)
2532                 wr = &fr_wr;
2533         else
2534                 wr->next = &fr_wr;
2535
2536         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2537         if (ret) {
2538                 isert_err("fast registration failed, ret:%d\n", ret);
2539                 return ret;
2540         }
2541         fr_desc->ind &= ~ind;
2542
2543         sge->lkey = mr->lkey;
2544         sge->addr = frpl->page_list[0] + page_off;
2545         sge->length = mem->len;
2546
2547         isert_dbg("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2548                  __func__, __LINE__, sge->addr, sge->length,
2549                  sge->lkey);
2550
2551         return ret;
2552 }
2553
2554 static inline void
2555 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2556                      struct ib_sig_domain *domain)
2557 {
2558         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2559         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2560         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2561         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2562         /*
2563          * At the moment we hard code those, but if in the future
2564          * the target core would like to use it, we will take it
2565          * from se_cmd.
2566          */
2567         domain->sig.dif.apptag_check_mask = 0xffff;
2568         domain->sig.dif.app_escape = true;
2569         domain->sig.dif.ref_escape = true;
2570         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2571             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2572                 domain->sig.dif.ref_remap = true;
2573 };
2574
2575 static int
2576 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2577 {
2578         switch (se_cmd->prot_op) {
2579         case TARGET_PROT_DIN_INSERT:
2580         case TARGET_PROT_DOUT_STRIP:
2581                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2582                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2583                 break;
2584         case TARGET_PROT_DOUT_INSERT:
2585         case TARGET_PROT_DIN_STRIP:
2586                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2587                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2588                 break;
2589         case TARGET_PROT_DIN_PASS:
2590         case TARGET_PROT_DOUT_PASS:
2591                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2592                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2593                 break;
2594         default:
2595                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2596                 return -EINVAL;
2597         }
2598
2599         return 0;
2600 }
2601
2602 static inline u8
2603 isert_set_prot_checks(u8 prot_checks)
2604 {
2605         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2606                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2607                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2608 }
2609
2610 static int
2611 isert_reg_sig_mr(struct isert_conn *isert_conn,
2612                  struct se_cmd *se_cmd,
2613                  struct isert_rdma_wr *rdma_wr,
2614                  struct fast_reg_descriptor *fr_desc)
2615 {
2616         struct ib_send_wr sig_wr, inv_wr;
2617         struct ib_send_wr *bad_wr, *wr = NULL;
2618         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2619         struct ib_sig_attrs sig_attrs;
2620         int ret;
2621         u32 key;
2622
2623         memset(&sig_attrs, 0, sizeof(sig_attrs));
2624         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2625         if (ret)
2626                 goto err;
2627
2628         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2629
2630         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2631                 memset(&inv_wr, 0, sizeof(inv_wr));
2632                 inv_wr.opcode = IB_WR_LOCAL_INV;
2633                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2634                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2635                 wr = &inv_wr;
2636                 /* Bump the key */
2637                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2638                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2639         }
2640
2641         memset(&sig_wr, 0, sizeof(sig_wr));
2642         sig_wr.opcode = IB_WR_REG_SIG_MR;
2643         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2644         sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2645         sig_wr.num_sge = 1;
2646         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2647         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2648         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2649         if (se_cmd->t_prot_sg)
2650                 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2651
2652         if (!wr)
2653                 wr = &sig_wr;
2654         else
2655                 wr->next = &sig_wr;
2656
2657         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2658         if (ret) {
2659                 isert_err("fast registration failed, ret:%d\n", ret);
2660                 goto err;
2661         }
2662         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2663
2664         rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2665         rdma_wr->ib_sg[SIG].addr = 0;
2666         rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2667         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2668             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2669                 /*
2670                  * We have protection guards on the wire
2671                  * so we need to set a larget transfer
2672                  */
2673                 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2674
2675         isert_dbg("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2676                   rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2677                   rdma_wr->ib_sg[SIG].lkey);
2678 err:
2679         return ret;
2680 }
2681
2682 static int
2683 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2684                       struct isert_cmd *isert_cmd,
2685                       struct isert_rdma_wr *wr)
2686 {
2687         struct isert_device *device = isert_conn->conn_device;
2688         struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2689         int ret;
2690
2691         if (!wr->fr_desc->pi_ctx) {
2692                 ret = isert_create_pi_ctx(wr->fr_desc,
2693                                           device->ib_device,
2694                                           isert_conn->conn_pd);
2695                 if (ret) {
2696                         isert_err("conn %p failed to allocate pi_ctx\n",
2697                                   isert_conn);
2698                         return ret;
2699                 }
2700         }
2701
2702         if (se_cmd->t_prot_sg) {
2703                 ret = isert_map_data_buf(isert_conn, isert_cmd,
2704                                          se_cmd->t_prot_sg,
2705                                          se_cmd->t_prot_nents,
2706                                          se_cmd->prot_length,
2707                                          0, wr->iser_ib_op, &wr->prot);
2708                 if (ret) {
2709                         isert_err("conn %p failed to map protection buffer\n",
2710                                   isert_conn);
2711                         return ret;
2712                 }
2713
2714                 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2715                 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2716                                         ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2717                 if (ret) {
2718                         isert_err("conn %p failed to fast reg mr\n",
2719                                   isert_conn);
2720                         goto unmap_prot_cmd;
2721                 }
2722         }
2723
2724         ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2725         if (ret) {
2726                 isert_err("conn %p failed to fast reg mr\n",
2727                           isert_conn);
2728                 goto unmap_prot_cmd;
2729         }
2730         wr->fr_desc->ind |= ISERT_PROTECTED;
2731
2732         return 0;
2733
2734 unmap_prot_cmd:
2735         if (se_cmd->t_prot_sg)
2736                 isert_unmap_data_buf(isert_conn, &wr->prot);
2737
2738         return ret;
2739 }
2740
2741 static int
2742 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2743                struct isert_rdma_wr *wr)
2744 {
2745         struct se_cmd *se_cmd = &cmd->se_cmd;
2746         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2747         struct isert_conn *isert_conn = conn->context;
2748         struct fast_reg_descriptor *fr_desc = NULL;
2749         struct ib_send_wr *send_wr;
2750         struct ib_sge *ib_sg;
2751         u32 offset;
2752         int ret = 0;
2753         unsigned long flags;
2754
2755         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2756
2757         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2758         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2759                                  se_cmd->t_data_nents, se_cmd->data_length,
2760                                  offset, wr->iser_ib_op, &wr->data);
2761         if (ret)
2762                 return ret;
2763
2764         if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2765                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2766                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2767                                            struct fast_reg_descriptor, list);
2768                 list_del(&fr_desc->list);
2769                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2770                 wr->fr_desc = fr_desc;
2771         }
2772
2773         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2774                                 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2775         if (ret)
2776                 goto unmap_cmd;
2777
2778         if (isert_prot_cmd(isert_conn, se_cmd)) {
2779                 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2780                 if (ret)
2781                         goto unmap_cmd;
2782
2783                 ib_sg = &wr->ib_sg[SIG];
2784         } else {
2785                 ib_sg = &wr->ib_sg[DATA];
2786         }
2787
2788         memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2789         wr->ib_sge = &wr->s_ib_sge;
2790         wr->send_wr_num = 1;
2791         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2792         wr->send_wr = &wr->s_send_wr;
2793         wr->isert_cmd = isert_cmd;
2794
2795         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2796         send_wr->sg_list = &wr->s_ib_sge;
2797         send_wr->num_sge = 1;
2798         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2799         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2800                 send_wr->opcode = IB_WR_RDMA_WRITE;
2801                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2802                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2803                 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2804                                       0 : IB_SEND_SIGNALED;
2805         } else {
2806                 send_wr->opcode = IB_WR_RDMA_READ;
2807                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2808                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2809                 send_wr->send_flags = IB_SEND_SIGNALED;
2810         }
2811
2812         return 0;
2813
2814 unmap_cmd:
2815         if (fr_desc) {
2816                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2817                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2818                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2819         }
2820         isert_unmap_data_buf(isert_conn, &wr->data);
2821
2822         return ret;
2823 }
2824
2825 static int
2826 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2827 {
2828         struct se_cmd *se_cmd = &cmd->se_cmd;
2829         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2830         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2831         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2832         struct isert_device *device = isert_conn->conn_device;
2833         struct ib_send_wr *wr_failed;
2834         int rc;
2835
2836         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2837                  isert_cmd, se_cmd->data_length);
2838         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2839         rc = device->reg_rdma_mem(conn, cmd, wr);
2840         if (rc) {
2841                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2842                 return rc;
2843         }
2844
2845         if (!isert_prot_cmd(isert_conn, se_cmd)) {
2846                 /*
2847                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2848                  */
2849                 isert_create_send_desc(isert_conn, isert_cmd,
2850                                        &isert_cmd->tx_desc);
2851                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2852                                      &isert_cmd->tx_desc.iscsi_header);
2853                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2854                 isert_init_send_wr(isert_conn, isert_cmd,
2855                                    &isert_cmd->tx_desc.send_wr);
2856                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2857                 wr->send_wr_num += 1;
2858         }
2859
2860         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2861         if (rc)
2862                 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2863
2864         if (!isert_prot_cmd(isert_conn, se_cmd))
2865                 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2866                          "READ\n", isert_cmd);
2867         else
2868                 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2869                          isert_cmd);
2870
2871         return 1;
2872 }
2873
2874 static int
2875 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2876 {
2877         struct se_cmd *se_cmd = &cmd->se_cmd;
2878         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2879         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2880         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2881         struct isert_device *device = isert_conn->conn_device;
2882         struct ib_send_wr *wr_failed;
2883         int rc;
2884
2885         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2886                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2887         wr->iser_ib_op = ISER_IB_RDMA_READ;
2888         rc = device->reg_rdma_mem(conn, cmd, wr);
2889         if (rc) {
2890                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2891                 return rc;
2892         }
2893
2894         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2895         if (rc)
2896                 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2897
2898         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2899                  isert_cmd);
2900
2901         return 0;
2902 }
2903
2904 static int
2905 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2906 {
2907         int ret;
2908
2909         switch (state) {
2910         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2911                 ret = isert_put_nopin(cmd, conn, false);
2912                 break;
2913         default:
2914                 isert_err("Unknown immediate state: 0x%02x\n", state);
2915                 ret = -EINVAL;
2916                 break;
2917         }
2918
2919         return ret;
2920 }
2921
2922 static int
2923 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2924 {
2925         struct isert_conn *isert_conn = conn->context;
2926         int ret;
2927
2928         switch (state) {
2929         case ISTATE_SEND_LOGOUTRSP:
2930                 ret = isert_put_logout_rsp(cmd, conn);
2931                 if (!ret)
2932                         isert_conn->logout_posted = true;
2933                 break;
2934         case ISTATE_SEND_NOPIN:
2935                 ret = isert_put_nopin(cmd, conn, true);
2936                 break;
2937         case ISTATE_SEND_TASKMGTRSP:
2938                 ret = isert_put_tm_rsp(cmd, conn);
2939                 break;
2940         case ISTATE_SEND_REJECT:
2941                 ret = isert_put_reject(cmd, conn);
2942                 break;
2943         case ISTATE_SEND_TEXTRSP:
2944                 ret = isert_put_text_rsp(cmd, conn);
2945                 break;
2946         case ISTATE_SEND_STATUS:
2947                 /*
2948                  * Special case for sending non GOOD SCSI status from TX thread
2949                  * context during pre se_cmd excecution failure.
2950                  */
2951                 ret = isert_put_response(conn, cmd);
2952                 break;
2953         default:
2954                 isert_err("Unknown response state: 0x%02x\n", state);
2955                 ret = -EINVAL;
2956                 break;
2957         }
2958
2959         return ret;
2960 }
2961
2962 struct rdma_cm_id *
2963 isert_setup_id(struct isert_np *isert_np)
2964 {
2965         struct iscsi_np *np = isert_np->np;
2966         struct rdma_cm_id *id;
2967         struct sockaddr *sa;
2968         int ret;
2969
2970         sa = (struct sockaddr *)&np->np_sockaddr;
2971         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2972
2973         id = rdma_create_id(isert_cma_handler, isert_np,
2974                             RDMA_PS_TCP, IB_QPT_RC);
2975         if (IS_ERR(id)) {
2976                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2977                 ret = PTR_ERR(id);
2978                 goto out;
2979         }
2980         isert_dbg("id %p context %p\n", id, id->context);
2981
2982         ret = rdma_bind_addr(id, sa);
2983         if (ret) {
2984                 isert_err("rdma_bind_addr() failed: %d\n", ret);
2985                 goto out_id;
2986         }
2987
2988         ret = rdma_listen(id, ISERT_RDMA_LISTEN_BACKLOG);
2989         if (ret) {
2990                 isert_err("rdma_listen() failed: %d\n", ret);
2991                 goto out_id;
2992         }
2993
2994         return id;
2995 out_id:
2996         rdma_destroy_id(id);
2997 out:
2998         return ERR_PTR(ret);
2999 }
3000
3001 static int
3002 isert_setup_np(struct iscsi_np *np,
3003                struct __kernel_sockaddr_storage *ksockaddr)
3004 {
3005         struct isert_np *isert_np;
3006         struct rdma_cm_id *isert_lid;
3007         int ret;
3008
3009         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3010         if (!isert_np) {
3011                 isert_err("Unable to allocate struct isert_np\n");
3012                 return -ENOMEM;
3013         }
3014         sema_init(&isert_np->np_sem, 0);
3015         mutex_init(&isert_np->np_accept_mutex);
3016         INIT_LIST_HEAD(&isert_np->np_accept_list);
3017         init_completion(&isert_np->np_login_comp);
3018         isert_np->np = np;
3019
3020         /*
3021          * Setup the np->np_sockaddr from the passed sockaddr setup
3022          * in iscsi_target_configfs.c code..
3023          */
3024         memcpy(&np->np_sockaddr, ksockaddr,
3025                sizeof(struct __kernel_sockaddr_storage));
3026
3027         isert_lid = isert_setup_id(isert_np);
3028         if (IS_ERR(isert_lid)) {
3029                 ret = PTR_ERR(isert_lid);
3030                 goto out;
3031         }
3032
3033         isert_np->np_cm_id = isert_lid;
3034         np->np_context = isert_np;
3035
3036         return 0;
3037
3038 out:
3039         kfree(isert_np);
3040
3041         return ret;
3042 }
3043
3044 static int
3045 isert_rdma_accept(struct isert_conn *isert_conn)
3046 {
3047         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3048         struct rdma_conn_param cp;
3049         int ret;
3050
3051         memset(&cp, 0, sizeof(struct rdma_conn_param));
3052         cp.initiator_depth = isert_conn->initiator_depth;
3053         cp.retry_count = 7;
3054         cp.rnr_retry_count = 7;
3055
3056         isert_dbg("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3057
3058         ret = rdma_accept(cm_id, &cp);
3059         if (ret) {
3060                 isert_err("rdma_accept() failed with: %d\n", ret);
3061                 return ret;
3062         }
3063
3064         isert_dbg("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3065
3066         return 0;
3067 }
3068
3069 static int
3070 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3071 {
3072         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3073         int ret;
3074
3075         isert_info("before login_req comp conn: %p\n", isert_conn);
3076         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3077         if (ret) {
3078                 isert_err("isert_conn %p interrupted before got login req\n",
3079                           isert_conn);
3080                 return ret;
3081         }
3082         reinit_completion(&isert_conn->login_req_comp);
3083
3084         /*
3085          * For login requests after the first PDU, isert_rx_login_req() will
3086          * kick schedule_delayed_work(&conn->login_work) as the packet is
3087          * received, which turns this callback from iscsi_target_do_login_rx()
3088          * into a NOP.
3089          */
3090         if (!login->first_request)
3091                 return 0;
3092
3093         isert_rx_login_req(isert_conn);
3094
3095         isert_info("before conn_login_comp conn: %p\n", conn);
3096         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3097         if (ret)
3098                 return ret;
3099
3100         isert_info("processing login->req: %p\n", login->req);
3101
3102         return 0;
3103 }
3104
3105 static void
3106 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3107                     struct isert_conn *isert_conn)
3108 {
3109         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3110         struct rdma_route *cm_route = &cm_id->route;
3111         struct sockaddr_in *sock_in;
3112         struct sockaddr_in6 *sock_in6;
3113
3114         conn->login_family = np->np_sockaddr.ss_family;
3115
3116         if (np->np_sockaddr.ss_family == AF_INET6) {
3117                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3118                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3119                          &sock_in6->sin6_addr.in6_u);
3120                 conn->login_port = ntohs(sock_in6->sin6_port);
3121
3122                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3123                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3124                          &sock_in6->sin6_addr.in6_u);
3125                 conn->local_port = ntohs(sock_in6->sin6_port);
3126         } else {
3127                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3128                 sprintf(conn->login_ip, "%pI4",
3129                         &sock_in->sin_addr.s_addr);
3130                 conn->login_port = ntohs(sock_in->sin_port);
3131
3132                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3133                 sprintf(conn->local_ip, "%pI4",
3134                         &sock_in->sin_addr.s_addr);
3135                 conn->local_port = ntohs(sock_in->sin_port);
3136         }
3137 }
3138
3139 static int
3140 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3141 {
3142         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3143         struct isert_conn *isert_conn;
3144         int max_accept = 0, ret;
3145
3146 accept_wait:
3147         ret = down_interruptible(&isert_np->np_sem);
3148         if (ret || max_accept > 5)
3149                 return -ENODEV;
3150
3151         spin_lock_bh(&np->np_thread_lock);
3152         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3153                 spin_unlock_bh(&np->np_thread_lock);
3154                 isert_dbg("np_thread_state %d for isert_accept_np\n",
3155                          np->np_thread_state);
3156                 /**
3157                  * No point in stalling here when np_thread
3158                  * is in state RESET/SHUTDOWN/EXIT - bail
3159                  **/
3160                 return -ENODEV;
3161         }
3162         spin_unlock_bh(&np->np_thread_lock);
3163
3164         mutex_lock(&isert_np->np_accept_mutex);
3165         if (list_empty(&isert_np->np_accept_list)) {
3166                 mutex_unlock(&isert_np->np_accept_mutex);
3167                 max_accept++;
3168                 goto accept_wait;
3169         }
3170         isert_conn = list_first_entry(&isert_np->np_accept_list,
3171                         struct isert_conn, conn_accept_node);
3172         list_del_init(&isert_conn->conn_accept_node);
3173         mutex_unlock(&isert_np->np_accept_mutex);
3174
3175         conn->context = isert_conn;
3176         isert_conn->conn = conn;
3177         max_accept = 0;
3178
3179         isert_set_conn_info(np, conn, isert_conn);
3180
3181         isert_dbg("Processing isert_conn: %p\n", isert_conn);
3182
3183         return 0;
3184 }
3185
3186 static void
3187 isert_free_np(struct iscsi_np *np)
3188 {
3189         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3190         struct isert_conn *isert_conn, *n;
3191
3192         if (isert_np->np_cm_id)
3193                 rdma_destroy_id(isert_np->np_cm_id);
3194
3195         /*
3196          * FIXME: At this point we don't have a good way to insure
3197          * that at this point we don't have hanging connections that
3198          * completed RDMA establishment but didn't start iscsi login
3199          * process. So work-around this by cleaning up what ever piled
3200          * up in np_accept_list.
3201          */
3202         mutex_lock(&isert_np->np_accept_mutex);
3203         if (!list_empty(&isert_np->np_accept_list)) {
3204                 isert_info("Still have isert connections, cleaning up...\n");
3205                 list_for_each_entry_safe(isert_conn, n,
3206                                          &isert_np->np_accept_list,
3207                                          conn_accept_node) {
3208                         isert_info("cleaning isert_conn %p state (%d)\n",
3209                                    isert_conn, isert_conn->state);
3210                         isert_connect_release(isert_conn);
3211                 }
3212         }
3213         mutex_unlock(&isert_np->np_accept_mutex);
3214
3215         np->np_context = NULL;
3216         kfree(isert_np);
3217 }
3218
3219 static void isert_release_work(struct work_struct *work)
3220 {
3221         struct isert_conn *isert_conn = container_of(work,
3222                                                      struct isert_conn,
3223                                                      release_work);
3224
3225         isert_info("Starting release conn %p\n", isert_conn);
3226
3227         wait_for_completion(&isert_conn->conn_wait);
3228
3229         mutex_lock(&isert_conn->conn_mutex);
3230         isert_conn->state = ISER_CONN_DOWN;
3231         mutex_unlock(&isert_conn->conn_mutex);
3232
3233         isert_info("Destroying conn %p\n", isert_conn);
3234         isert_put_conn(isert_conn);
3235 }
3236
3237 static void
3238 isert_wait4logout(struct isert_conn *isert_conn)
3239 {
3240         struct iscsi_conn *conn = isert_conn->conn;
3241
3242         if (isert_conn->logout_posted) {
3243                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3244                 wait_for_completion_timeout(&conn->conn_logout_comp,
3245                                             SECONDS_FOR_LOGOUT_COMP * HZ);
3246         }
3247 }
3248
3249 static void
3250 isert_wait4cmds(struct iscsi_conn *conn)
3251 {
3252         if (conn->sess) {
3253                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3254                 target_wait_for_sess_cmds(conn->sess->se_sess);
3255         }
3256 }
3257
3258 static void
3259 isert_wait4flush(struct isert_conn *isert_conn)
3260 {
3261         struct ib_recv_wr *bad_wr;
3262
3263         init_completion(&isert_conn->conn_wait_comp_err);
3264         isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3265         /* post an indication that all flush errors were consumed */
3266         if (ib_post_recv(isert_conn->conn_qp, &isert_conn->beacon, &bad_wr)) {
3267                 isert_err("conn %p failed to post beacon", isert_conn);
3268                 return;
3269         }
3270
3271         wait_for_completion(&isert_conn->conn_wait_comp_err);
3272 }
3273
3274 static void isert_wait_conn(struct iscsi_conn *conn)
3275 {
3276         struct isert_conn *isert_conn = conn->context;
3277
3278         isert_dbg("isert_wait_conn: Starting\n");
3279
3280         mutex_lock(&isert_conn->conn_mutex);
3281         /*
3282          * Only wait for conn_wait_comp_err if the isert_conn made it
3283          * into full feature phase..
3284          */
3285         if (isert_conn->state == ISER_CONN_INIT) {
3286                 mutex_unlock(&isert_conn->conn_mutex);
3287                 return;
3288         }
3289         isert_conn_terminate(isert_conn);
3290         mutex_unlock(&isert_conn->conn_mutex);
3291
3292         isert_wait4cmds(conn);
3293         isert_wait4flush(isert_conn);
3294         isert_wait4logout(isert_conn);
3295
3296         INIT_WORK(&isert_conn->release_work, isert_release_work);
3297         queue_work(isert_release_wq, &isert_conn->release_work);
3298 }
3299
3300 static void isert_free_conn(struct iscsi_conn *conn)
3301 {
3302         struct isert_conn *isert_conn = conn->context;
3303
3304         isert_put_conn(isert_conn);
3305 }
3306
3307 static struct iscsit_transport iser_target_transport = {
3308         .name                   = "IB/iSER",
3309         .transport_type         = ISCSI_INFINIBAND,
3310         .priv_size              = sizeof(struct isert_cmd),
3311         .owner                  = THIS_MODULE,
3312         .iscsit_setup_np        = isert_setup_np,
3313         .iscsit_accept_np       = isert_accept_np,
3314         .iscsit_free_np         = isert_free_np,
3315         .iscsit_wait_conn       = isert_wait_conn,
3316         .iscsit_free_conn       = isert_free_conn,
3317         .iscsit_get_login_rx    = isert_get_login_rx,
3318         .iscsit_put_login_tx    = isert_put_login_tx,
3319         .iscsit_immediate_queue = isert_immediate_queue,
3320         .iscsit_response_queue  = isert_response_queue,
3321         .iscsit_get_dataout     = isert_get_dataout,
3322         .iscsit_queue_data_in   = isert_put_datain,
3323         .iscsit_queue_status    = isert_put_response,
3324         .iscsit_aborted_task    = isert_aborted_task,
3325         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3326 };
3327
3328 static int __init isert_init(void)
3329 {
3330         int ret;
3331
3332         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3333         if (!isert_comp_wq) {
3334                 isert_err("Unable to allocate isert_comp_wq\n");
3335                 ret = -ENOMEM;
3336                 return -ENOMEM;
3337         }
3338
3339         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3340                                         WQ_UNBOUND_MAX_ACTIVE);
3341         if (!isert_release_wq) {
3342                 isert_err("Unable to allocate isert_release_wq\n");
3343                 ret = -ENOMEM;
3344                 goto destroy_comp_wq;
3345         }
3346
3347         iscsit_register_transport(&iser_target_transport);
3348         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3349
3350         return 0;
3351
3352 destroy_comp_wq:
3353         destroy_workqueue(isert_comp_wq);
3354
3355         return ret;
3356 }
3357
3358 static void __exit isert_exit(void)
3359 {
3360         flush_scheduled_work();
3361         destroy_workqueue(isert_release_wq);
3362         destroy_workqueue(isert_comp_wq);
3363         iscsit_unregister_transport(&iser_target_transport);
3364         isert_dbg("iSER_TARGET[0] - Released iser_target_transport\n");
3365 }
3366
3367 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3368 MODULE_VERSION("0.1");
3369 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3370 MODULE_LICENSE("GPL");
3371
3372 module_init(isert_init);
3373 module_exit(isert_exit);