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 <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static int
  56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  57
  58 static void
  59 isert_qp_event_callback(struct ib_event *e, void *context)
  60 {
  61         struct isert_conn *isert_conn = (struct isert_conn *)context;
  62
  63         pr_err("isert_qp_event_callback event: %d\n", e->event);
  64         switch (e->event) {
  65         case IB_EVENT_COMM_EST:
  66                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  67                 break;
  68         case IB_EVENT_QP_LAST_WQE_REACHED:
  69                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 static int
  77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  78 {
  79         int ret;
  80
  81         ret = ib_query_device(ib_dev, devattr);
  82         if (ret) {
  83                 pr_err("ib_query_device() failed: %d\n", ret);
  84                 return ret;
  85         }
  86         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  87         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  88
  89         return 0;
  90 }
  91
  92 static int
  93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  94                     u8 protection)
  95 {
  96         struct isert_device *device = isert_conn->conn_device;
  97         struct ib_qp_init_attr attr;
  98         int ret, index, min_index = 0;
  99
 100         mutex_lock(&device_list_mutex);
 101         for (index = 0; index < device->cqs_used; index++)
 102                 if (device->cq_active_qps[index] <
 103                     device->cq_active_qps[min_index])
 104                         min_index = index;
 105         device->cq_active_qps[min_index]++;
 106         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 107         mutex_unlock(&device_list_mutex);
 108
 109         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 110         attr.event_handler = isert_qp_event_callback;
 111         attr.qp_context = isert_conn;
 112         attr.send_cq = device->dev_tx_cq[min_index];
 113         attr.recv_cq = device->dev_rx_cq[min_index];
 114         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 115         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 116         /*
 117          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 118          * work-around for RDMA_READs with ConnectX-2.
 119          *
 120          * Also, still make sure to have at least two SGEs for
 121          * outgoing control PDU responses.
 122          */
 123         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 124         isert_conn->max_sge = attr.cap.max_send_sge;
 125
 126         attr.cap.max_recv_sge = 1;
 127         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 128         attr.qp_type = IB_QPT_RC;
 129         if (protection)
 130                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 131
 132         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 133                  cma_id->device);
 134         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 135                  isert_conn->conn_pd->device);
 136
 137         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 138         if (ret) {
 139                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 140                 return ret;
 141         }
 142         isert_conn->conn_qp = cma_id->qp;
 143         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 144
 145         return 0;
 146 }
 147
 148 static void
 149 isert_cq_event_callback(struct ib_event *e, void *context)
 150 {
 151         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 152 }
 153
 154 static int
 155 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 156 {
 157         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 158         struct iser_rx_desc *rx_desc;
 159         struct ib_sge *rx_sg;
 160         u64 dma_addr;
 161         int i, j;
 162
 163         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 164                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 165         if (!isert_conn->conn_rx_descs)
 166                 goto fail;
 167
 168         rx_desc = isert_conn->conn_rx_descs;
 169
 170         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 171                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 172                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 173                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 174                         goto dma_map_fail;
 175
 176                 rx_desc->dma_addr = dma_addr;
 177
 178                 rx_sg = &rx_desc->rx_sg;
 179                 rx_sg->addr = rx_desc->dma_addr;
 180                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 181                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 182         }
 183
 184         isert_conn->conn_rx_desc_head = 0;
 185         return 0;
 186
 187 dma_map_fail:
 188         rx_desc = isert_conn->conn_rx_descs;
 189         for (j = 0; j < i; j++, rx_desc++) {
 190                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 191                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 192         }
 193         kfree(isert_conn->conn_rx_descs);
 194         isert_conn->conn_rx_descs = NULL;
 195 fail:
 196         return -ENOMEM;
 197 }
 198
 199 static void
 200 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 201 {
 202         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 203         struct iser_rx_desc *rx_desc;
 204         int i;
 205
 206         if (!isert_conn->conn_rx_descs)
 207                 return;
 208
 209         rx_desc = isert_conn->conn_rx_descs;
 210         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 211                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 212                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 213         }
 214
 215         kfree(isert_conn->conn_rx_descs);
 216         isert_conn->conn_rx_descs = NULL;
 217 }
 218
 219 static void isert_cq_tx_work(struct work_struct *);
 220 static void isert_cq_tx_callback(struct ib_cq *, void *);
 221 static void isert_cq_rx_work(struct work_struct *);
 222 static void isert_cq_rx_callback(struct ib_cq *, void *);
 223
 224 static int
 225 isert_create_device_ib_res(struct isert_device *device)
 226 {
 227         struct ib_device *ib_dev = device->ib_device;
 228         struct isert_cq_desc *cq_desc;
 229         struct ib_device_attr *dev_attr;
 230         int ret = 0, i, j;
 231
 232         dev_attr = &device->dev_attr;
 233         ret = isert_query_device(ib_dev, dev_attr);
 234         if (ret)
 235                 return ret;
 236
 237         /* asign function handlers */
 238         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 239             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 240                 device->use_fastreg = 1;
 241                 device->reg_rdma_mem = isert_reg_rdma;
 242                 device->unreg_rdma_mem = isert_unreg_rdma;
 243         } else {
 244                 device->use_fastreg = 0;
 245                 device->reg_rdma_mem = isert_map_rdma;
 246                 device->unreg_rdma_mem = isert_unmap_cmd;
 247         }
 248
 249         /* Check signature cap */
 250         device->pi_capable = dev_attr->device_cap_flags &
 251                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 252
 253         device->cqs_used = min_t(int, num_online_cpus(),
 254                                  device->ib_device->num_comp_vectors);
 255         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 256         pr_debug("Using %d CQs, device %s supports %d vectors support "
 257                  "Fast registration %d pi_capable %d\n",
 258                  device->cqs_used, device->ib_device->name,
 259                  device->ib_device->num_comp_vectors, device->use_fastreg,
 260                  device->pi_capable);
 261         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 262                                 device->cqs_used, GFP_KERNEL);
 263         if (!device->cq_desc) {
 264                 pr_err("Unable to allocate device->cq_desc\n");
 265                 return -ENOMEM;
 266         }
 267         cq_desc = device->cq_desc;
 268
 269         for (i = 0; i < device->cqs_used; i++) {
 270                 cq_desc[i].device = device;
 271                 cq_desc[i].cq_index = i;
 272
 273                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 274                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 275                                                 isert_cq_rx_callback,
 276                                                 isert_cq_event_callback,
 277                                                 (void *)&cq_desc[i],
 278                                                 ISER_MAX_RX_CQ_LEN, i);
 279                 if (IS_ERR(device->dev_rx_cq[i])) {
 280                         ret = PTR_ERR(device->dev_rx_cq[i]);
 281                         device->dev_rx_cq[i] = NULL;
 282                         goto out_cq;
 283                 }
 284
 285                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 286                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 287                                                 isert_cq_tx_callback,
 288                                                 isert_cq_event_callback,
 289                                                 (void *)&cq_desc[i],
 290                                                 ISER_MAX_TX_CQ_LEN, i);
 291                 if (IS_ERR(device->dev_tx_cq[i])) {
 292                         ret = PTR_ERR(device->dev_tx_cq[i]);
 293                         device->dev_tx_cq[i] = NULL;
 294                         goto out_cq;
 295                 }
 296
 297                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 298                 if (ret)
 299                         goto out_cq;
 300
 301                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 302                 if (ret)
 303                         goto out_cq;
 304         }
 305
 306         return 0;
 307
 308 out_cq:
 309         for (j = 0; j < i; j++) {
 310                 cq_desc = &device->cq_desc[j];
 311
 312                 if (device->dev_rx_cq[j]) {
 313                         cancel_work_sync(&cq_desc->cq_rx_work);
 314                         ib_destroy_cq(device->dev_rx_cq[j]);
 315                 }
 316                 if (device->dev_tx_cq[j]) {
 317                         cancel_work_sync(&cq_desc->cq_tx_work);
 318                         ib_destroy_cq(device->dev_tx_cq[j]);
 319                 }
 320         }
 321         kfree(device->cq_desc);
 322
 323         return ret;
 324 }
 325
 326 static void
 327 isert_free_device_ib_res(struct isert_device *device)
 328 {
 329         struct isert_cq_desc *cq_desc;
 330         int i;
 331
 332         for (i = 0; i < device->cqs_used; i++) {
 333                 cq_desc = &device->cq_desc[i];
 334
 335                 cancel_work_sync(&cq_desc->cq_rx_work);
 336                 cancel_work_sync(&cq_desc->cq_tx_work);
 337                 ib_destroy_cq(device->dev_rx_cq[i]);
 338                 ib_destroy_cq(device->dev_tx_cq[i]);
 339                 device->dev_rx_cq[i] = NULL;
 340                 device->dev_tx_cq[i] = NULL;
 341         }
 342
 343         kfree(device->cq_desc);
 344 }
 345
 346 static void
 347 isert_device_try_release(struct isert_device *device)
 348 {
 349         mutex_lock(&device_list_mutex);
 350         device->refcount--;
 351         if (!device->refcount) {
 352                 isert_free_device_ib_res(device);
 353                 list_del(&device->dev_node);
 354                 kfree(device);
 355         }
 356         mutex_unlock(&device_list_mutex);
 357 }
 358
 359 static struct isert_device *
 360 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 361 {
 362         struct isert_device *device;
 363         int ret;
 364
 365         mutex_lock(&device_list_mutex);
 366         list_for_each_entry(device, &device_list, dev_node) {
 367                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 368                         device->refcount++;
 369                         mutex_unlock(&device_list_mutex);
 370                         return device;
 371                 }
 372         }
 373
 374         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 375         if (!device) {
 376                 mutex_unlock(&device_list_mutex);
 377                 return ERR_PTR(-ENOMEM);
 378         }
 379
 380         INIT_LIST_HEAD(&device->dev_node);
 381
 382         device->ib_device = cma_id->device;
 383         ret = isert_create_device_ib_res(device);
 384         if (ret) {
 385                 kfree(device);
 386                 mutex_unlock(&device_list_mutex);
 387                 return ERR_PTR(ret);
 388         }
 389
 390         device->refcount++;
 391         list_add_tail(&device->dev_node, &device_list);
 392         mutex_unlock(&device_list_mutex);
 393
 394         return device;
 395 }
 396
 397 static void
 398 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 399 {
 400         struct fast_reg_descriptor *fr_desc, *tmp;
 401         int i = 0;
 402
 403         if (list_empty(&isert_conn->conn_fr_pool))
 404                 return;
 405
 406         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 407
 408         list_for_each_entry_safe(fr_desc, tmp,
 409                                  &isert_conn->conn_fr_pool, list) {
 410                 list_del(&fr_desc->list);
 411                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 412                 ib_dereg_mr(fr_desc->data_mr);
 413                 if (fr_desc->pi_ctx) {
 414                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 415                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 416                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 417                         kfree(fr_desc->pi_ctx);
 418                 }
 419                 kfree(fr_desc);
 420                 ++i;
 421         }
 422
 423         if (i < isert_conn->conn_fr_pool_size)
 424                 pr_warn("Pool still has %d regions registered\n",
 425                         isert_conn->conn_fr_pool_size - i);
 426 }
 427
 428 static int
 429 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 430                      struct fast_reg_descriptor *fr_desc, u8 protection)
 431 {
 432         int ret;
 433
 434         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 435                                                          ISCSI_ISER_SG_TABLESIZE);
 436         if (IS_ERR(fr_desc->data_frpl)) {
 437                 pr_err("Failed to allocate data frpl err=%ld\n",
 438                        PTR_ERR(fr_desc->data_frpl));
 439                 return PTR_ERR(fr_desc->data_frpl);
 440         }
 441
 442         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 443         if (IS_ERR(fr_desc->data_mr)) {
 444                 pr_err("Failed to allocate data frmr err=%ld\n",
 445                        PTR_ERR(fr_desc->data_mr));
 446                 ret = PTR_ERR(fr_desc->data_mr);
 447                 goto err_data_frpl;
 448         }
 449         pr_debug("Create fr_desc %p page_list %p\n",
 450                  fr_desc, fr_desc->data_frpl->page_list);
 451         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 452
 453         if (protection) {
 454                 struct ib_mr_init_attr mr_init_attr = {0};
 455                 struct pi_context *pi_ctx;
 456
 457                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 458                 if (!fr_desc->pi_ctx) {
 459                         pr_err("Failed to allocate pi context\n");
 460                         ret = -ENOMEM;
 461                         goto err_data_mr;
 462                 }
 463                 pi_ctx = fr_desc->pi_ctx;
 464
 465                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 466                                                     ISCSI_ISER_SG_TABLESIZE);
 467                 if (IS_ERR(pi_ctx->prot_frpl)) {
 468                         pr_err("Failed to allocate prot frpl err=%ld\n",
 469                                PTR_ERR(pi_ctx->prot_frpl));
 470                         ret = PTR_ERR(pi_ctx->prot_frpl);
 471                         goto err_pi_ctx;
 472                 }
 473
 474                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 475                 if (IS_ERR(pi_ctx->prot_mr)) {
 476                         pr_err("Failed to allocate prot frmr err=%ld\n",
 477                                PTR_ERR(pi_ctx->prot_mr));
 478                         ret = PTR_ERR(pi_ctx->prot_mr);
 479                         goto err_prot_frpl;
 480                 }
 481                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 482
 483                 mr_init_attr.max_reg_descriptors = 2;
 484                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 485                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 486                 if (IS_ERR(pi_ctx->sig_mr)) {
 487                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 488                                PTR_ERR(pi_ctx->sig_mr));
 489                         ret = PTR_ERR(pi_ctx->sig_mr);
 490                         goto err_prot_mr;
 491                 }
 492                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 493         }
 494         fr_desc->ind &= ~ISERT_PROTECTED;
 495
 496         return 0;
 497 err_prot_mr:
 498         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 499 err_prot_frpl:
 500         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 501 err_pi_ctx:
 502         kfree(fr_desc->pi_ctx);
 503 err_data_mr:
 504         ib_dereg_mr(fr_desc->data_mr);
 505 err_data_frpl:
 506         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 507
 508         return ret;
 509 }
 510
 511 static int
 512 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 513 {
 514         struct fast_reg_descriptor *fr_desc;
 515         struct isert_device *device = isert_conn->conn_device;
 516         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 517         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 518         int i, ret, tag_num;
 519         /*
 520          * Setup the number of FRMRs based upon the number of tags
 521          * available to session in iscsi_target_locate_portal().
 522          */
 523         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 524         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 525
 526         isert_conn->conn_fr_pool_size = 0;
 527         for (i = 0; i < tag_num; i++) {
 528                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 529                 if (!fr_desc) {
 530                         pr_err("Failed to allocate fast_reg descriptor\n");
 531                         ret = -ENOMEM;
 532                         goto err;
 533                 }
 534
 535                 ret = isert_create_fr_desc(device->ib_device,
 536                                            isert_conn->conn_pd, fr_desc,
 537                                            pi_support);
 538                 if (ret) {
 539                         pr_err("Failed to create fastreg descriptor err=%d\n",
 540                                ret);
 541                         kfree(fr_desc);
 542                         goto err;
 543                 }
 544
 545                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 546                 isert_conn->conn_fr_pool_size++;
 547         }
 548
 549         pr_debug("Creating conn %p fastreg pool size=%d",
 550                  isert_conn, isert_conn->conn_fr_pool_size);
 551
 552         return 0;
 553
 554 err:
 555         isert_conn_free_fastreg_pool(isert_conn);
 556         return ret;
 557 }
 558
 559 static int
 560 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 561 {
 562         struct iscsi_np *np = cma_id->context;
 563         struct isert_np *isert_np = np->np_context;
 564         struct isert_conn *isert_conn;
 565         struct isert_device *device;
 566         struct ib_device *ib_dev = cma_id->device;
 567         int ret = 0;
 568         u8 pi_support;
 569
 570         spin_lock_bh(&np->np_thread_lock);
 571         if (!np->enabled) {
 572                 spin_unlock_bh(&np->np_thread_lock);
 573                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 574                 return rdma_reject(cma_id, NULL, 0);
 575         }
 576         spin_unlock_bh(&np->np_thread_lock);
 577
 578         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 579                  cma_id, cma_id->context);
 580
 581         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 582         if (!isert_conn) {
 583                 pr_err("Unable to allocate isert_conn\n");
 584                 return -ENOMEM;
 585         }
 586         isert_conn->state = ISER_CONN_INIT;
 587         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 588         init_completion(&isert_conn->conn_login_comp);
 589         init_completion(&isert_conn->conn_wait);
 590         init_completion(&isert_conn->conn_wait_comp_err);
 591         kref_init(&isert_conn->conn_kref);
 592         mutex_init(&isert_conn->conn_mutex);
 593         spin_lock_init(&isert_conn->conn_lock);
 594         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 595
 596         cma_id->context = isert_conn;
 597         isert_conn->conn_cm_id = cma_id;
 598
 599         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 600                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 601         if (!isert_conn->login_buf) {
 602                 pr_err("Unable to allocate isert_conn->login_buf\n");
 603                 ret = -ENOMEM;
 604                 goto out;
 605         }
 606
 607         isert_conn->login_req_buf = isert_conn->login_buf;
 608         isert_conn->login_rsp_buf = isert_conn->login_buf +
 609                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 610         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 611                  isert_conn->login_buf, isert_conn->login_req_buf,
 612                  isert_conn->login_rsp_buf);
 613
 614         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 615                                 (void *)isert_conn->login_req_buf,
 616                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 617
 618         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 619         if (ret) {
 620                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 621                        ret);
 622                 isert_conn->login_req_dma = 0;
 623                 goto out_login_buf;
 624         }
 625
 626         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 627                                         (void *)isert_conn->login_rsp_buf,
 628                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 629
 630         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 631         if (ret) {
 632                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 633                        ret);
 634                 isert_conn->login_rsp_dma = 0;
 635                 goto out_req_dma_map;
 636         }
 637
 638         device = isert_device_find_by_ib_dev(cma_id);
 639         if (IS_ERR(device)) {
 640                 ret = PTR_ERR(device);
 641                 goto out_rsp_dma_map;
 642         }
 643
 644         /* Set max inflight RDMA READ requests */
 645         isert_conn->initiator_depth = min_t(u8,
 646                                 event->param.conn.initiator_depth,
 647                                 device->dev_attr.max_qp_init_rd_atom);
 648         pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 649
 650         isert_conn->conn_device = device;
 651         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 652         if (IS_ERR(isert_conn->conn_pd)) {
 653                 ret = PTR_ERR(isert_conn->conn_pd);
 654                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 655                        isert_conn, ret);
 656                 goto out_pd;
 657         }
 658
 659         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 660                                            IB_ACCESS_LOCAL_WRITE);
 661         if (IS_ERR(isert_conn->conn_mr)) {
 662                 ret = PTR_ERR(isert_conn->conn_mr);
 663                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 664                        isert_conn, ret);
 665                 goto out_mr;
 666         }
 667
 668         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 669         if (pi_support && !device->pi_capable) {
 670                 pr_err("Protection information requested but not supported, "
 671                        "rejecting connect request\n");
 672                 ret = rdma_reject(cma_id, NULL, 0);
 673                 goto out_mr;
 674         }
 675
 676         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 677         if (ret)
 678                 goto out_conn_dev;
 679
 680         mutex_lock(&isert_np->np_accept_mutex);
 681         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 682         mutex_unlock(&isert_np->np_accept_mutex);
 683
 684         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 685         up(&isert_np->np_sem);
 686         return 0;
 687
 688 out_conn_dev:
 689         ib_dereg_mr(isert_conn->conn_mr);
 690 out_mr:
 691         ib_dealloc_pd(isert_conn->conn_pd);
 692 out_pd:
 693         isert_device_try_release(device);
 694 out_rsp_dma_map:
 695         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 696                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 697 out_req_dma_map:
 698         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 699                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 700 out_login_buf:
 701         kfree(isert_conn->login_buf);
 702 out:
 703         kfree(isert_conn);
 704         return ret;
 705 }
 706
 707 static void
 708 isert_connect_release(struct isert_conn *isert_conn)
 709 {
 710         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 711         struct isert_device *device = isert_conn->conn_device;
 712         int cq_index;
 713
 714         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 715
 716         if (device && device->use_fastreg)
 717                 isert_conn_free_fastreg_pool(isert_conn);
 718
 719         if (isert_conn->conn_qp) {
 720                 cq_index = ((struct isert_cq_desc *)
 721                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 722                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 723                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 724
 725                 rdma_destroy_qp(isert_conn->conn_cm_id);
 726         }
 727
 728         isert_free_rx_descriptors(isert_conn);
 729         rdma_destroy_id(isert_conn->conn_cm_id);
 730
 731         ib_dereg_mr(isert_conn->conn_mr);
 732         ib_dealloc_pd(isert_conn->conn_pd);
 733
 734         if (isert_conn->login_buf) {
 735                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 736                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 737                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 738                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 739                                     DMA_FROM_DEVICE);
 740                 kfree(isert_conn->login_buf);
 741         }
 742         kfree(isert_conn);
 743
 744         if (device)
 745                 isert_device_try_release(device);
 746
 747         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 748 }
 749
 750 static void
 751 isert_connected_handler(struct rdma_cm_id *cma_id)
 752 {
 753         struct isert_conn *isert_conn = cma_id->context;
 754
 755         kref_get(&isert_conn->conn_kref);
 756 }
 757
 758 static void
 759 isert_release_conn_kref(struct kref *kref)
 760 {
 761         struct isert_conn *isert_conn = container_of(kref,
 762                                 struct isert_conn, conn_kref);
 763
 764         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 765                  current->comm, current->pid);
 766
 767         isert_connect_release(isert_conn);
 768 }
 769
 770 static void
 771 isert_put_conn(struct isert_conn *isert_conn)
 772 {
 773         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 774 }
 775
 776 static void
 777 isert_disconnect_work(struct work_struct *work)
 778 {
 779         struct isert_conn *isert_conn = container_of(work,
 780                                 struct isert_conn, conn_logout_work);
 781
 782         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 783         mutex_lock(&isert_conn->conn_mutex);
 784         if (isert_conn->state == ISER_CONN_UP)
 785                 isert_conn->state = ISER_CONN_TERMINATING;
 786
 787         if (isert_conn->post_recv_buf_count == 0 &&
 788             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 789                 mutex_unlock(&isert_conn->conn_mutex);
 790                 goto wake_up;
 791         }
 792         if (!isert_conn->conn_cm_id) {
 793                 mutex_unlock(&isert_conn->conn_mutex);
 794                 isert_put_conn(isert_conn);
 795                 return;
 796         }
 797
 798         if (isert_conn->disconnect) {
 799                 /* Send DREQ/DREP towards our initiator */
 800                 rdma_disconnect(isert_conn->conn_cm_id);
 801         }
 802
 803         mutex_unlock(&isert_conn->conn_mutex);
 804
 805 wake_up:
 806         complete(&isert_conn->conn_wait);
 807 }
 808
 809 static int
 810 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
 811 {
 812         struct isert_conn *isert_conn;
 813
 814         if (!cma_id->qp) {
 815                 struct isert_np *isert_np = cma_id->context;
 816
 817                 isert_np->np_cm_id = NULL;
 818                 return -1;
 819         }
 820
 821         isert_conn = (struct isert_conn *)cma_id->context;
 822
 823         isert_conn->disconnect = disconnect;
 824         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 825         schedule_work(&isert_conn->conn_logout_work);
 826
 827         return 0;
 828 }
 829
 830 static int
 831 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 832 {
 833         int ret = 0;
 834         bool disconnect = false;
 835
 836         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 837                  event->event, event->status, cma_id->context, cma_id);
 838
 839         switch (event->event) {
 840         case RDMA_CM_EVENT_CONNECT_REQUEST:
 841                 ret = isert_connect_request(cma_id, event);
 842                 if (ret)
 843                         pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 844                                 event->event, ret);
 845                 break;
 846         case RDMA_CM_EVENT_ESTABLISHED:
 847                 isert_connected_handler(cma_id);
 848                 break;
 849         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 850         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 851         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 852                 disconnect = true;
 853         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 854                 ret = isert_disconnected_handler(cma_id, disconnect);
 855                 break;
 856         case RDMA_CM_EVENT_CONNECT_ERROR:
 857         default:
 858                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 859                 break;
 860         }
 861
 862         return ret;
 863 }
 864
 865 static int
 866 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 867 {
 868         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 869         int i, ret;
 870         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 871         struct iser_rx_desc *rx_desc;
 872
 873         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 874                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 875                 rx_wr->wr_id    = (unsigned long)rx_desc;
 876                 rx_wr->sg_list  = &rx_desc->rx_sg;
 877                 rx_wr->num_sge  = 1;
 878                 rx_wr->next     = rx_wr + 1;
 879                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 880         }
 881
 882         rx_wr--;
 883         rx_wr->next = NULL; /* mark end of work requests list */
 884
 885         isert_conn->post_recv_buf_count += count;
 886         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 887                                 &rx_wr_failed);
 888         if (ret) {
 889                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 890                 isert_conn->post_recv_buf_count -= count;
 891         } else {
 892                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 893                 isert_conn->conn_rx_desc_head = rx_head;
 894         }
 895         return ret;
 896 }
 897
 898 static int
 899 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 900 {
 901         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 902         struct ib_send_wr send_wr, *send_wr_failed;
 903         int ret;
 904
 905         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 906                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 907
 908         send_wr.next    = NULL;
 909         send_wr.wr_id   = (unsigned long)tx_desc;
 910         send_wr.sg_list = tx_desc->tx_sg;
 911         send_wr.num_sge = tx_desc->num_sge;
 912         send_wr.opcode  = IB_WR_SEND;
 913         send_wr.send_flags = IB_SEND_SIGNALED;
 914
 915         atomic_inc(&isert_conn->post_send_buf_count);
 916
 917         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 918         if (ret) {
 919                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 920                 atomic_dec(&isert_conn->post_send_buf_count);
 921         }
 922
 923         return ret;
 924 }
 925
 926 static void
 927 isert_create_send_desc(struct isert_conn *isert_conn,
 928                        struct isert_cmd *isert_cmd,
 929                        struct iser_tx_desc *tx_desc)
 930 {
 931         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 932
 933         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 934                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 935
 936         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 937         tx_desc->iser_header.flags = ISER_VER;
 938
 939         tx_desc->num_sge = 1;
 940         tx_desc->isert_cmd = isert_cmd;
 941
 942         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 943                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 944                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 945         }
 946 }
 947
 948 static int
 949 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 950                    struct iser_tx_desc *tx_desc)
 951 {
 952         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 953         u64 dma_addr;
 954
 955         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 956                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 957         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 958                 pr_err("ib_dma_mapping_error() failed\n");
 959                 return -ENOMEM;
 960         }
 961
 962         tx_desc->dma_addr = dma_addr;
 963         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 964         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 965         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 966
 967         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 968                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 969                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 970
 971         return 0;
 972 }
 973
 974 static void
 975 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 976                    struct ib_send_wr *send_wr, bool coalesce)
 977 {
 978         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 979
 980         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 981         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 982         send_wr->opcode = IB_WR_SEND;
 983         send_wr->sg_list = &tx_desc->tx_sg[0];
 984         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 985         /*
 986          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 987          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 988          */
 989         mutex_lock(&isert_conn->conn_mutex);
 990         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 991             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 992                 tx_desc->llnode_active = true;
 993                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 994                 mutex_unlock(&isert_conn->conn_mutex);
 995                 return;
 996         }
 997         isert_conn->conn_comp_batch = 0;
 998         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 999         mutex_unlock(&isert_conn->conn_mutex);
1000
1001         send_wr->send_flags = IB_SEND_SIGNALED;
1002 }
1003
1004 static int
1005 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1006 {
1007         struct ib_recv_wr rx_wr, *rx_wr_fail;
1008         struct ib_sge sge;
1009         int ret;
1010
1011         memset(&sge, 0, sizeof(struct ib_sge));
1012         sge.addr = isert_conn->login_req_dma;
1013         sge.length = ISER_RX_LOGIN_SIZE;
1014         sge.lkey = isert_conn->conn_mr->lkey;
1015
1016         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1017                 sge.addr, sge.length, sge.lkey);
1018
1019         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1020         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1021         rx_wr.sg_list = &sge;
1022         rx_wr.num_sge = 1;
1023
1024         isert_conn->post_recv_buf_count++;
1025         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1026         if (ret) {
1027                 pr_err("ib_post_recv() failed: %d\n", ret);
1028                 isert_conn->post_recv_buf_count--;
1029         }
1030
1031         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1032         return ret;
1033 }
1034
1035 static int
1036 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1037                    u32 length)
1038 {
1039         struct isert_conn *isert_conn = conn->context;
1040         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1041         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1042         int ret;
1043
1044         isert_create_send_desc(isert_conn, NULL, tx_desc);
1045
1046         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1047                sizeof(struct iscsi_hdr));
1048
1049         isert_init_tx_hdrs(isert_conn, tx_desc);
1050
1051         if (length > 0) {
1052                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1053
1054                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1055                                            length, DMA_TO_DEVICE);
1056
1057                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1058
1059                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1060                                               length, DMA_TO_DEVICE);
1061
1062                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1063                 tx_dsg->length  = length;
1064                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1065                 tx_desc->num_sge = 2;
1066         }
1067         if (!login->login_failed) {
1068                 if (login->login_complete) {
1069                         if (!conn->sess->sess_ops->SessionType &&
1070                             isert_conn->conn_device->use_fastreg) {
1071                                 /* Normal Session and fastreg is used */
1072                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1073
1074                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1075                                                                      pi_support);
1076                                 if (ret) {
1077                                         pr_err("Conn: %p failed to create"
1078                                                " fastreg pool\n", isert_conn);
1079                                         return ret;
1080                                 }
1081                         }
1082
1083                         ret = isert_alloc_rx_descriptors(isert_conn);
1084                         if (ret)
1085                                 return ret;
1086
1087                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1088                         if (ret)
1089                                 return ret;
1090
1091                         isert_conn->state = ISER_CONN_UP;
1092                         goto post_send;
1093                 }
1094
1095                 ret = isert_rdma_post_recvl(isert_conn);
1096                 if (ret)
1097                         return ret;
1098         }
1099 post_send:
1100         ret = isert_post_send(isert_conn, tx_desc);
1101         if (ret)
1102                 return ret;
1103
1104         return 0;
1105 }
1106
1107 static void
1108 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1109                    struct isert_conn *isert_conn)
1110 {
1111         struct iscsi_conn *conn = isert_conn->conn;
1112         struct iscsi_login *login = conn->conn_login;
1113         int size;
1114
1115         if (!login) {
1116                 pr_err("conn->conn_login is NULL\n");
1117                 dump_stack();
1118                 return;
1119         }
1120
1121         if (login->first_request) {
1122                 struct iscsi_login_req *login_req =
1123                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1124                 /*
1125                  * Setup the initial iscsi_login values from the leading
1126                  * login request PDU.
1127                  */
1128                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1129                 login->current_stage =
1130                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1131                          >> 2;
1132                 login->version_min      = login_req->min_version;
1133                 login->version_max      = login_req->max_version;
1134                 memcpy(login->isid, login_req->isid, 6);
1135                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1136                 login->init_task_tag    = login_req->itt;
1137                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1138                 login->cid              = be16_to_cpu(login_req->cid);
1139                 login->tsih             = be16_to_cpu(login_req->tsih);
1140         }
1141
1142         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1143
1144         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1145         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1146                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1147         memcpy(login->req_buf, &rx_desc->data[0], size);
1148
1149         if (login->first_request) {
1150                 complete(&isert_conn->conn_login_comp);
1151                 return;
1152         }
1153         schedule_delayed_work(&conn->login_work, 0);
1154 }
1155
1156 static struct iscsi_cmd
1157 *isert_allocate_cmd(struct iscsi_conn *conn)
1158 {
1159         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1160         struct isert_cmd *isert_cmd;
1161         struct iscsi_cmd *cmd;
1162
1163         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1164         if (!cmd) {
1165                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1166                 return NULL;
1167         }
1168         isert_cmd = iscsit_priv_cmd(cmd);
1169         isert_cmd->conn = isert_conn;
1170         isert_cmd->iscsi_cmd = cmd;
1171
1172         return cmd;
1173 }
1174
1175 static int
1176 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1177                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1178                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1179 {
1180         struct iscsi_conn *conn = isert_conn->conn;
1181         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1182         struct scatterlist *sg;
1183         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1184         bool dump_payload = false;
1185
1186         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1187         if (rc < 0)
1188                 return rc;
1189
1190         imm_data = cmd->immediate_data;
1191         imm_data_len = cmd->first_burst_len;
1192         unsol_data = cmd->unsolicited_data;
1193
1194         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1195         if (rc < 0) {
1196                 return 0;
1197         } else if (rc > 0) {
1198                 dump_payload = true;
1199                 goto sequence_cmd;
1200         }
1201
1202         if (!imm_data)
1203                 return 0;
1204
1205         sg = &cmd->se_cmd.t_data_sg[0];
1206         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1207
1208         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1209                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1210
1211         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1212
1213         cmd->write_data_done += imm_data_len;
1214
1215         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1216                 spin_lock_bh(&cmd->istate_lock);
1217                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1218                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1219                 spin_unlock_bh(&cmd->istate_lock);
1220         }
1221
1222 sequence_cmd:
1223         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1224
1225         if (!rc && dump_payload == false && unsol_data)
1226                 iscsit_set_unsoliticed_dataout(cmd);
1227         else if (dump_payload && imm_data)
1228                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1229
1230         return 0;
1231 }
1232
1233 static int
1234 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1235                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1236 {
1237         struct scatterlist *sg_start;
1238         struct iscsi_conn *conn = isert_conn->conn;
1239         struct iscsi_cmd *cmd = NULL;
1240         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1241         u32 unsol_data_len = ntoh24(hdr->dlength);
1242         int rc, sg_nents, sg_off, page_off;
1243
1244         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1245         if (rc < 0)
1246                 return rc;
1247         else if (!cmd)
1248                 return 0;
1249         /*
1250          * FIXME: Unexpected unsolicited_data out
1251          */
1252         if (!cmd->unsolicited_data) {
1253                 pr_err("Received unexpected solicited data payload\n");
1254                 dump_stack();
1255                 return -1;
1256         }
1257
1258         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1259                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1260
1261         sg_off = cmd->write_data_done / PAGE_SIZE;
1262         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1263         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1264         page_off = cmd->write_data_done % PAGE_SIZE;
1265         /*
1266          * FIXME: Non page-aligned unsolicited_data out
1267          */
1268         if (page_off) {
1269                 pr_err("Received unexpected non-page aligned data payload\n");
1270                 dump_stack();
1271                 return -1;
1272         }
1273         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1274                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1275
1276         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1277                             unsol_data_len);
1278
1279         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1280         if (rc < 0)
1281                 return rc;
1282
1283         return 0;
1284 }
1285
1286 static int
1287 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1288                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1289                      unsigned char *buf)
1290 {
1291         struct iscsi_conn *conn = isert_conn->conn;
1292         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1293         int rc;
1294
1295         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1296         if (rc < 0)
1297                 return rc;
1298         /*
1299          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1300          */
1301
1302         return iscsit_process_nop_out(conn, cmd, hdr);
1303 }
1304
1305 static int
1306 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1307                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1308                       struct iscsi_text *hdr)
1309 {
1310         struct iscsi_conn *conn = isert_conn->conn;
1311         u32 payload_length = ntoh24(hdr->dlength);
1312         int rc;
1313         unsigned char *text_in;
1314
1315         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1316         if (rc < 0)
1317                 return rc;
1318
1319         text_in = kzalloc(payload_length, GFP_KERNEL);
1320         if (!text_in) {
1321                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1322                        payload_length);
1323                 return -ENOMEM;
1324         }
1325         cmd->text_in_ptr = text_in;
1326
1327         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1328
1329         return iscsit_process_text_cmd(conn, cmd, hdr);
1330 }
1331
1332 static int
1333 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1334                 uint32_t read_stag, uint64_t read_va,
1335                 uint32_t write_stag, uint64_t write_va)
1336 {
1337         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1338         struct iscsi_conn *conn = isert_conn->conn;
1339         struct iscsi_session *sess = conn->sess;
1340         struct iscsi_cmd *cmd;
1341         struct isert_cmd *isert_cmd;
1342         int ret = -EINVAL;
1343         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1344
1345         if (sess->sess_ops->SessionType &&
1346            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1347                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1348                        " ignoring\n", opcode);
1349                 return 0;
1350         }
1351
1352         switch (opcode) {
1353         case ISCSI_OP_SCSI_CMD:
1354                 cmd = isert_allocate_cmd(conn);
1355                 if (!cmd)
1356                         break;
1357
1358                 isert_cmd = iscsit_priv_cmd(cmd);
1359                 isert_cmd->read_stag = read_stag;
1360                 isert_cmd->read_va = read_va;
1361                 isert_cmd->write_stag = write_stag;
1362                 isert_cmd->write_va = write_va;
1363
1364                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1365                                         rx_desc, (unsigned char *)hdr);
1366                 break;
1367         case ISCSI_OP_NOOP_OUT:
1368                 cmd = isert_allocate_cmd(conn);
1369                 if (!cmd)
1370                         break;
1371
1372                 isert_cmd = iscsit_priv_cmd(cmd);
1373                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1374                                            rx_desc, (unsigned char *)hdr);
1375                 break;
1376         case ISCSI_OP_SCSI_DATA_OUT:
1377                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1378                                                 (unsigned char *)hdr);
1379                 break;
1380         case ISCSI_OP_SCSI_TMFUNC:
1381                 cmd = isert_allocate_cmd(conn);
1382                 if (!cmd)
1383                         break;
1384
1385                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1386                                                 (unsigned char *)hdr);
1387                 break;
1388         case ISCSI_OP_LOGOUT:
1389                 cmd = isert_allocate_cmd(conn);
1390                 if (!cmd)
1391                         break;
1392
1393                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1394                 if (ret > 0)
1395                         wait_for_completion_timeout(&conn->conn_logout_comp,
1396                                                     SECONDS_FOR_LOGOUT_COMP *
1397                                                     HZ);
1398                 break;
1399         case ISCSI_OP_TEXT:
1400                 cmd = isert_allocate_cmd(conn);
1401                 if (!cmd)
1402                         break;
1403
1404                 isert_cmd = iscsit_priv_cmd(cmd);
1405                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1406                                             rx_desc, (struct iscsi_text *)hdr);
1407                 break;
1408         default:
1409                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1410                 dump_stack();
1411                 break;
1412         }
1413
1414         return ret;
1415 }
1416
1417 static void
1418 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1419 {
1420         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1421         uint64_t read_va = 0, write_va = 0;
1422         uint32_t read_stag = 0, write_stag = 0;
1423         int rc;
1424
1425         switch (iser_hdr->flags & 0xF0) {
1426         case ISCSI_CTRL:
1427                 if (iser_hdr->flags & ISER_RSV) {
1428                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1429                         read_va = be64_to_cpu(iser_hdr->read_va);
1430                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1431                                  read_stag, (unsigned long long)read_va);
1432                 }
1433                 if (iser_hdr->flags & ISER_WSV) {
1434                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1435                         write_va = be64_to_cpu(iser_hdr->write_va);
1436                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1437                                  write_stag, (unsigned long long)write_va);
1438                 }
1439
1440                 pr_debug("ISER ISCSI_CTRL PDU\n");
1441                 break;
1442         case ISER_HELLO:
1443                 pr_err("iSER Hello message\n");
1444                 break;
1445         default:
1446                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1447                 break;
1448         }
1449
1450         rc = isert_rx_opcode(isert_conn, rx_desc,
1451                              read_stag, read_va, write_stag, write_va);
1452 }
1453
1454 static void
1455 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1456                     unsigned long xfer_len)
1457 {
1458         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1459         struct iscsi_hdr *hdr;
1460         u64 rx_dma;
1461         int rx_buflen, outstanding;
1462
1463         if ((char *)desc == isert_conn->login_req_buf) {
1464                 rx_dma = isert_conn->login_req_dma;
1465                 rx_buflen = ISER_RX_LOGIN_SIZE;
1466                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1467                          rx_dma, rx_buflen);
1468         } else {
1469                 rx_dma = desc->dma_addr;
1470                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1471                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1472                          rx_dma, rx_buflen);
1473         }
1474
1475         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1476
1477         hdr = &desc->iscsi_header;
1478         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1479                  hdr->opcode, hdr->itt, hdr->flags,
1480                  (int)(xfer_len - ISER_HEADERS_LEN));
1481
1482         if ((char *)desc == isert_conn->login_req_buf)
1483                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1484                                    isert_conn);
1485         else
1486                 isert_rx_do_work(desc, isert_conn);
1487
1488         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1489                                       DMA_FROM_DEVICE);
1490
1491         isert_conn->post_recv_buf_count--;
1492         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1493                  isert_conn->post_recv_buf_count);
1494
1495         if ((char *)desc == isert_conn->login_req_buf)
1496                 return;
1497
1498         outstanding = isert_conn->post_recv_buf_count;
1499         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1500                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1501                                 ISERT_MIN_POSTED_RX);
1502                 err = isert_post_recv(isert_conn, count);
1503                 if (err) {
1504                         pr_err("isert_post_recv() count: %d failed, %d\n",
1505                                count, err);
1506                 }
1507         }
1508 }
1509
1510 static int
1511 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1512                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1513                    enum iser_ib_op_code op, struct isert_data_buf *data)
1514 {
1515         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1516
1517         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1518                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1519
1520         data->len = length - offset;
1521         data->offset = offset;
1522         data->sg_off = data->offset / PAGE_SIZE;
1523
1524         data->sg = &sg[data->sg_off];
1525         data->nents = min_t(unsigned int, nents - data->sg_off,
1526                                           ISCSI_ISER_SG_TABLESIZE);
1527         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1528                                         PAGE_SIZE);
1529
1530         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1531                                         data->dma_dir);
1532         if (unlikely(!data->dma_nents)) {
1533                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1534                 return -EINVAL;
1535         }
1536
1537         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1538                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1539
1540         return 0;
1541 }
1542
1543 static void
1544 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1545 {
1546         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1547
1548         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1549         memset(data, 0, sizeof(*data));
1550 }
1551
1552
1553
1554 static void
1555 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1556 {
1557         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1558
1559         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1560
1561         if (wr->data.sg) {
1562                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1563                 isert_unmap_data_buf(isert_conn, &wr->data);
1564         }
1565
1566         if (wr->send_wr) {
1567                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1568                 kfree(wr->send_wr);
1569                 wr->send_wr = NULL;
1570         }
1571
1572         if (wr->ib_sge) {
1573                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1574                 kfree(wr->ib_sge);
1575                 wr->ib_sge = NULL;
1576         }
1577 }
1578
1579 static void
1580 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1581 {
1582         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1583         LIST_HEAD(unmap_list);
1584
1585         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1586
1587         if (wr->fr_desc) {
1588                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1589                          isert_cmd, wr->fr_desc);
1590                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1591                         isert_unmap_data_buf(isert_conn, &wr->prot);
1592                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1593                 }
1594                 spin_lock_bh(&isert_conn->conn_lock);
1595                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1596                 spin_unlock_bh(&isert_conn->conn_lock);
1597                 wr->fr_desc = NULL;
1598         }
1599
1600         if (wr->data.sg) {
1601                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1602                 isert_unmap_data_buf(isert_conn, &wr->data);
1603         }
1604
1605         wr->ib_sge = NULL;
1606         wr->send_wr = NULL;
1607 }
1608
1609 static void
1610 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1611 {
1612         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1613         struct isert_conn *isert_conn = isert_cmd->conn;
1614         struct iscsi_conn *conn = isert_conn->conn;
1615         struct isert_device *device = isert_conn->conn_device;
1616
1617         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1618
1619         switch (cmd->iscsi_opcode) {
1620         case ISCSI_OP_SCSI_CMD:
1621                 spin_lock_bh(&conn->cmd_lock);
1622                 if (!list_empty(&cmd->i_conn_node))
1623                         list_del_init(&cmd->i_conn_node);
1624                 spin_unlock_bh(&conn->cmd_lock);
1625
1626                 if (cmd->data_direction == DMA_TO_DEVICE) {
1627                         iscsit_stop_dataout_timer(cmd);
1628                         /*
1629                          * Check for special case during comp_err where
1630                          * WRITE_PENDING has been handed off from core,
1631                          * but requires an extra target_put_sess_cmd()
1632                          * before transport_generic_free_cmd() below.
1633                          */
1634                         if (comp_err &&
1635                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1636                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1637
1638                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1639                         }
1640                 }
1641
1642                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1643                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1644                 break;
1645         case ISCSI_OP_SCSI_TMFUNC:
1646                 spin_lock_bh(&conn->cmd_lock);
1647                 if (!list_empty(&cmd->i_conn_node))
1648                         list_del_init(&cmd->i_conn_node);
1649                 spin_unlock_bh(&conn->cmd_lock);
1650
1651                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1652                 break;
1653         case ISCSI_OP_REJECT:
1654         case ISCSI_OP_NOOP_OUT:
1655         case ISCSI_OP_TEXT:
1656                 spin_lock_bh(&conn->cmd_lock);
1657                 if (!list_empty(&cmd->i_conn_node))
1658                         list_del_init(&cmd->i_conn_node);
1659                 spin_unlock_bh(&conn->cmd_lock);
1660
1661                 /*
1662                  * Handle special case for REJECT when iscsi_add_reject*() has
1663                  * overwritten the original iscsi_opcode assignment, and the
1664                  * associated cmd->se_cmd needs to be released.
1665                  */
1666                 if (cmd->se_cmd.se_tfo != NULL) {
1667                         pr_debug("Calling transport_generic_free_cmd from"
1668                                  " isert_put_cmd for 0x%02x\n",
1669                                  cmd->iscsi_opcode);
1670                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1671                         break;
1672                 }
1673                 /*
1674                  * Fall-through
1675                  */
1676         default:
1677                 iscsit_release_cmd(cmd);
1678                 break;
1679         }
1680 }
1681
1682 static void
1683 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1684 {
1685         if (tx_desc->dma_addr != 0) {
1686                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1687                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1688                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1689                 tx_desc->dma_addr = 0;
1690         }
1691 }
1692
1693 static void
1694 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1695                      struct ib_device *ib_dev, bool comp_err)
1696 {
1697         if (isert_cmd->pdu_buf_dma != 0) {
1698                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1699                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1700                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1701                 isert_cmd->pdu_buf_dma = 0;
1702         }
1703
1704         isert_unmap_tx_desc(tx_desc, ib_dev);
1705         isert_put_cmd(isert_cmd, comp_err);
1706 }
1707
1708 static int
1709 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1710 {
1711         struct ib_mr_status mr_status;
1712         int ret;
1713
1714         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1715         if (ret) {
1716                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1717                 goto fail_mr_status;
1718         }
1719
1720         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1721                 u64 sec_offset_err;
1722                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1723
1724                 switch (mr_status.sig_err.err_type) {
1725                 case IB_SIG_BAD_GUARD:
1726                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1727                         break;
1728                 case IB_SIG_BAD_REFTAG:
1729                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1730                         break;
1731                 case IB_SIG_BAD_APPTAG:
1732                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1733                         break;
1734                 }
1735                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1736                 do_div(sec_offset_err, block_size);
1737                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1738
1739                 pr_err("isert: PI error found type %d at sector 0x%llx "
1740                        "expected 0x%x vs actual 0x%x\n",
1741                        mr_status.sig_err.err_type,
1742                        (unsigned long long)se_cmd->bad_sector,
1743                        mr_status.sig_err.expected,
1744                        mr_status.sig_err.actual);
1745                 ret = 1;
1746         }
1747
1748 fail_mr_status:
1749         return ret;
1750 }
1751
1752 static void
1753 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1754                             struct isert_cmd *isert_cmd)
1755 {
1756         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1757         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1758         struct se_cmd *se_cmd = &cmd->se_cmd;
1759         struct isert_conn *isert_conn = isert_cmd->conn;
1760         struct isert_device *device = isert_conn->conn_device;
1761         int ret = 0;
1762
1763         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1764                 ret = isert_check_pi_status(se_cmd,
1765                                             wr->fr_desc->pi_ctx->sig_mr);
1766                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1767         }
1768
1769         device->unreg_rdma_mem(isert_cmd, isert_conn);
1770         wr->send_wr_num = 0;
1771         if (ret)
1772                 transport_send_check_condition_and_sense(se_cmd,
1773                                                          se_cmd->pi_err, 0);
1774         else
1775                 isert_put_response(isert_conn->conn, cmd);
1776 }
1777
1778 static void
1779 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1780                            struct isert_cmd *isert_cmd)
1781 {
1782         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1783         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1784         struct se_cmd *se_cmd = &cmd->se_cmd;
1785         struct isert_conn *isert_conn = isert_cmd->conn;
1786         struct isert_device *device = isert_conn->conn_device;
1787         int ret = 0;
1788
1789         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1790                 ret = isert_check_pi_status(se_cmd,
1791                                             wr->fr_desc->pi_ctx->sig_mr);
1792                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1793         }
1794
1795         iscsit_stop_dataout_timer(cmd);
1796         device->unreg_rdma_mem(isert_cmd, isert_conn);
1797         cmd->write_data_done = wr->data.len;
1798         wr->send_wr_num = 0;
1799
1800         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1801         spin_lock_bh(&cmd->istate_lock);
1802         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1803         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1804         spin_unlock_bh(&cmd->istate_lock);
1805
1806         if (ret)
1807                 transport_send_check_condition_and_sense(se_cmd,
1808                                                          se_cmd->pi_err, 0);
1809         else
1810                 target_execute_cmd(se_cmd);
1811 }
1812
1813 static void
1814 isert_do_control_comp(struct work_struct *work)
1815 {
1816         struct isert_cmd *isert_cmd = container_of(work,
1817                         struct isert_cmd, comp_work);
1818         struct isert_conn *isert_conn = isert_cmd->conn;
1819         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1820         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1821
1822         switch (cmd->i_state) {
1823         case ISTATE_SEND_TASKMGTRSP:
1824                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1825
1826                 atomic_dec(&isert_conn->post_send_buf_count);
1827                 iscsit_tmr_post_handler(cmd, cmd->conn);
1828
1829                 cmd->i_state = ISTATE_SENT_STATUS;
1830                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1831                 break;
1832         case ISTATE_SEND_REJECT:
1833                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1834                 atomic_dec(&isert_conn->post_send_buf_count);
1835
1836                 cmd->i_state = ISTATE_SENT_STATUS;
1837                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1838                 break;
1839         case ISTATE_SEND_LOGOUTRSP:
1840                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1841
1842                 atomic_dec(&isert_conn->post_send_buf_count);
1843                 iscsit_logout_post_handler(cmd, cmd->conn);
1844                 break;
1845         case ISTATE_SEND_TEXTRSP:
1846                 atomic_dec(&isert_conn->post_send_buf_count);
1847                 cmd->i_state = ISTATE_SENT_STATUS;
1848                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1849                 break;
1850         default:
1851                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1852                 dump_stack();
1853                 break;
1854         }
1855 }
1856
1857 static void
1858 isert_response_completion(struct iser_tx_desc *tx_desc,
1859                           struct isert_cmd *isert_cmd,
1860                           struct isert_conn *isert_conn,
1861                           struct ib_device *ib_dev)
1862 {
1863         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1864         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1865
1866         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1867             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1868             cmd->i_state == ISTATE_SEND_REJECT ||
1869             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1870                 isert_unmap_tx_desc(tx_desc, ib_dev);
1871
1872                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1873                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1874                 return;
1875         }
1876
1877         /**
1878          * If send_wr_num is 0 this means that we got
1879          * RDMA completion and we cleared it and we should
1880          * simply decrement the response post. else the
1881          * response is incorporated in send_wr_num, just
1882          * sub it.
1883          **/
1884         if (wr->send_wr_num)
1885                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1886         else
1887                 atomic_dec(&isert_conn->post_send_buf_count);
1888
1889         cmd->i_state = ISTATE_SENT_STATUS;
1890         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1891 }
1892
1893 static void
1894 __isert_send_completion(struct iser_tx_desc *tx_desc,
1895                         struct isert_conn *isert_conn)
1896 {
1897         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1898         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1899         struct isert_rdma_wr *wr;
1900
1901         if (!isert_cmd) {
1902                 atomic_dec(&isert_conn->post_send_buf_count);
1903                 isert_unmap_tx_desc(tx_desc, ib_dev);
1904                 return;
1905         }
1906         wr = &isert_cmd->rdma_wr;
1907
1908         switch (wr->iser_ib_op) {
1909         case ISER_IB_RECV:
1910                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1911                 dump_stack();
1912                 break;
1913         case ISER_IB_SEND:
1914                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1915                 isert_response_completion(tx_desc, isert_cmd,
1916                                           isert_conn, ib_dev);
1917                 break;
1918         case ISER_IB_RDMA_WRITE:
1919                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1920                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1921                 isert_completion_rdma_write(tx_desc, isert_cmd);
1922                 break;
1923         case ISER_IB_RDMA_READ:
1924                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1925
1926                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1927                 isert_completion_rdma_read(tx_desc, isert_cmd);
1928                 break;
1929         default:
1930                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1931                 dump_stack();
1932                 break;
1933         }
1934 }
1935
1936 static void
1937 isert_send_completion(struct iser_tx_desc *tx_desc,
1938                       struct isert_conn *isert_conn)
1939 {
1940         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1941         struct iser_tx_desc *t;
1942         /*
1943          * Drain coalesced completion llist starting from comp_llnode_batch
1944          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1945          */
1946         while (llnode) {
1947                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1948                 llnode = llist_next(llnode);
1949                 __isert_send_completion(t, isert_conn);
1950         }
1951         __isert_send_completion(tx_desc, isert_conn);
1952 }
1953
1954 static void
1955 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1956 {
1957         struct llist_node *llnode;
1958         struct isert_rdma_wr *wr;
1959         struct iser_tx_desc *t;
1960
1961         mutex_lock(&isert_conn->conn_mutex);
1962         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1963         isert_conn->conn_comp_batch = 0;
1964         mutex_unlock(&isert_conn->conn_mutex);
1965
1966         while (llnode) {
1967                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1968                 llnode = llist_next(llnode);
1969                 wr = &t->isert_cmd->rdma_wr;
1970
1971                 /**
1972                  * If send_wr_num is 0 this means that we got
1973                  * RDMA completion and we cleared it and we should
1974                  * simply decrement the response post. else the
1975                  * response is incorporated in send_wr_num, just
1976                  * sub it.
1977                  **/
1978                 if (wr->send_wr_num)
1979                         atomic_sub(wr->send_wr_num,
1980                                    &isert_conn->post_send_buf_count);
1981                 else
1982                         atomic_dec(&isert_conn->post_send_buf_count);
1983
1984                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1985         }
1986 }
1987
1988 static void
1989 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1990 {
1991         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1992         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1993         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1994         struct isert_rdma_wr *wr;
1995         struct iser_tx_desc *t;
1996
1997         while (llnode) {
1998                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1999                 llnode = llist_next(llnode);
2000                 wr = &t->isert_cmd->rdma_wr;
2001
2002                 /**
2003                  * If send_wr_num is 0 this means that we got
2004                  * RDMA completion and we cleared it and we should
2005                  * simply decrement the response post. else the
2006                  * response is incorporated in send_wr_num, just
2007                  * sub it.
2008                  **/
2009                 if (wr->send_wr_num)
2010                         atomic_sub(wr->send_wr_num,
2011                                    &isert_conn->post_send_buf_count);
2012                 else
2013                         atomic_dec(&isert_conn->post_send_buf_count);
2014
2015                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2016         }
2017         tx_desc->comp_llnode_batch = NULL;
2018
2019         if (!isert_cmd)
2020                 isert_unmap_tx_desc(tx_desc, ib_dev);
2021         else
2022                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2023 }
2024
2025 static void
2026 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2027 {
2028         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2029         struct iscsi_conn *conn = isert_conn->conn;
2030
2031         if (isert_conn->post_recv_buf_count)
2032                 return;
2033
2034         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2035
2036         if (conn->sess) {
2037                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2038                 target_wait_for_sess_cmds(conn->sess->se_sess);
2039         }
2040
2041         while (atomic_read(&isert_conn->post_send_buf_count))
2042                 msleep(3000);
2043
2044         mutex_lock(&isert_conn->conn_mutex);
2045         isert_conn->state = ISER_CONN_DOWN;
2046         mutex_unlock(&isert_conn->conn_mutex);
2047
2048         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2049
2050         complete(&isert_conn->conn_wait_comp_err);
2051 }
2052
2053 static void
2054 isert_cq_tx_work(struct work_struct *work)
2055 {
2056         struct isert_cq_desc *cq_desc = container_of(work,
2057                                 struct isert_cq_desc, cq_tx_work);
2058         struct isert_device *device = cq_desc->device;
2059         int cq_index = cq_desc->cq_index;
2060         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2061         struct isert_conn *isert_conn;
2062         struct iser_tx_desc *tx_desc;
2063         struct ib_wc wc;
2064
2065         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2066                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2067                 isert_conn = wc.qp->qp_context;
2068
2069                 if (wc.status == IB_WC_SUCCESS) {
2070                         isert_send_completion(tx_desc, isert_conn);
2071                 } else {
2072                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2073                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2074                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2075
2076                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2077                                 if (tx_desc->llnode_active)
2078                                         continue;
2079
2080                                 atomic_dec(&isert_conn->post_send_buf_count);
2081                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2082                         }
2083                 }
2084         }
2085
2086         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2087 }
2088
2089 static void
2090 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2091 {
2092         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2093
2094         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2095 }
2096
2097 static void
2098 isert_cq_rx_work(struct work_struct *work)
2099 {
2100         struct isert_cq_desc *cq_desc = container_of(work,
2101                         struct isert_cq_desc, cq_rx_work);
2102         struct isert_device *device = cq_desc->device;
2103         int cq_index = cq_desc->cq_index;
2104         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2105         struct isert_conn *isert_conn;
2106         struct iser_rx_desc *rx_desc;
2107         struct ib_wc wc;
2108         unsigned long xfer_len;
2109
2110         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2111                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2112                 isert_conn = wc.qp->qp_context;
2113
2114                 if (wc.status == IB_WC_SUCCESS) {
2115                         xfer_len = (unsigned long)wc.byte_len;
2116                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2117                 } else {
2118                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2119                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2120                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2121                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2122                                          wc.vendor_err);
2123                         }
2124                         isert_conn->post_recv_buf_count--;
2125                         isert_cq_rx_comp_err(isert_conn);
2126                 }
2127         }
2128
2129         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2130 }
2131
2132 static void
2133 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2134 {
2135         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2136
2137         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2138 }
2139
2140 static int
2141 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2142 {
2143         struct ib_send_wr *wr_failed;
2144         int ret;
2145
2146         atomic_inc(&isert_conn->post_send_buf_count);
2147
2148         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2149                            &wr_failed);
2150         if (ret) {
2151                 pr_err("ib_post_send failed with %d\n", ret);
2152                 atomic_dec(&isert_conn->post_send_buf_count);
2153                 return ret;
2154         }
2155         return ret;
2156 }
2157
2158 static int
2159 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2160 {
2161         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2162         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2163         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2164         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2165                                 &isert_cmd->tx_desc.iscsi_header;
2166
2167         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2168         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2169         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2170         /*
2171          * Attach SENSE DATA payload to iSCSI Response PDU
2172          */
2173         if (cmd->se_cmd.sense_buffer &&
2174             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2175             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2176                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2177                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2178                 u32 padding, pdu_len;
2179
2180                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2181                                    cmd->sense_buffer);
2182                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2183
2184                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2185                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2186                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2187
2188                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2189                                 (void *)cmd->sense_buffer, pdu_len,
2190                                 DMA_TO_DEVICE);
2191
2192                 isert_cmd->pdu_buf_len = pdu_len;
2193                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2194                 tx_dsg->length  = pdu_len;
2195                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2196                 isert_cmd->tx_desc.num_sge = 2;
2197         }
2198
2199         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2200
2201         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2202
2203         return isert_post_response(isert_conn, isert_cmd);
2204 }
2205
2206 static void
2207 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2208 {
2209         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2210         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2211         struct isert_device *device = isert_conn->conn_device;
2212
2213         spin_lock_bh(&conn->cmd_lock);
2214         if (!list_empty(&cmd->i_conn_node))
2215                 list_del_init(&cmd->i_conn_node);
2216         spin_unlock_bh(&conn->cmd_lock);
2217
2218         if (cmd->data_direction == DMA_TO_DEVICE)
2219                 iscsit_stop_dataout_timer(cmd);
2220
2221         device->unreg_rdma_mem(isert_cmd, isert_conn);
2222 }
2223
2224 static enum target_prot_op
2225 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2226 {
2227         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2228         struct isert_device *device = isert_conn->conn_device;
2229
2230         if (device->pi_capable)
2231                 return TARGET_PROT_ALL;
2232
2233         return TARGET_PROT_NORMAL;
2234 }
2235
2236 static int
2237 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2238                 bool nopout_response)
2239 {
2240         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2241         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2242         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2243
2244         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2245         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2246                                &isert_cmd->tx_desc.iscsi_header,
2247                                nopout_response);
2248         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2249         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2250
2251         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2252
2253         return isert_post_response(isert_conn, isert_cmd);
2254 }
2255
2256 static int
2257 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2258 {
2259         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2260         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2261         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2262
2263         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2264         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2265                                 &isert_cmd->tx_desc.iscsi_header);
2266         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2267         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2268
2269         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2270
2271         return isert_post_response(isert_conn, isert_cmd);
2272 }
2273
2274 static int
2275 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2276 {
2277         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2278         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2279         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2280
2281         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2282         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2283                                   &isert_cmd->tx_desc.iscsi_header);
2284         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2285         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2286
2287         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2288
2289         return isert_post_response(isert_conn, isert_cmd);
2290 }
2291
2292 static int
2293 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2294 {
2295         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2296         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2297         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2298         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2299         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2300         struct iscsi_reject *hdr =
2301                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2302
2303         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2304         iscsit_build_reject(cmd, conn, hdr);
2305         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2306
2307         hton24(hdr->dlength, ISCSI_HDR_LEN);
2308         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2309                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2310                         DMA_TO_DEVICE);
2311         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2312         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2313         tx_dsg->length  = ISCSI_HDR_LEN;
2314         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2315         isert_cmd->tx_desc.num_sge = 2;
2316
2317         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2318
2319         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2320
2321         return isert_post_response(isert_conn, isert_cmd);
2322 }
2323
2324 static int
2325 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2328         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2329         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2330         struct iscsi_text_rsp *hdr =
2331                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2332         u32 txt_rsp_len;
2333         int rc;
2334
2335         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2336         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2337         if (rc < 0)
2338                 return rc;
2339
2340         txt_rsp_len = rc;
2341         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2342
2343         if (txt_rsp_len) {
2344                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2345                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2346                 void *txt_rsp_buf = cmd->buf_ptr;
2347
2348                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2349                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2350
2351                 isert_cmd->pdu_buf_len = txt_rsp_len;
2352                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2353                 tx_dsg->length  = txt_rsp_len;
2354                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2355                 isert_cmd->tx_desc.num_sge = 2;
2356         }
2357         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2358
2359         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2360
2361         return isert_post_response(isert_conn, isert_cmd);
2362 }
2363
2364 static int
2365 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2366                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2367                     u32 data_left, u32 offset)
2368 {
2369         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2370         struct scatterlist *sg_start, *tmp_sg;
2371         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2372         u32 sg_off, page_off;
2373         int i = 0, sg_nents;
2374
2375         sg_off = offset / PAGE_SIZE;
2376         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2377         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2378         page_off = offset % PAGE_SIZE;
2379
2380         send_wr->sg_list = ib_sge;
2381         send_wr->num_sge = sg_nents;
2382         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2383         /*
2384          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2385          */
2386         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2387                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2388                          (unsigned long long)tmp_sg->dma_address,
2389                          tmp_sg->length, page_off);
2390
2391                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2392                 ib_sge->length = min_t(u32, data_left,
2393                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2394                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2395
2396                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2397                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2398                 page_off = 0;
2399                 data_left -= ib_sge->length;
2400                 ib_sge++;
2401                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2402         }
2403
2404         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2405                  send_wr->sg_list, send_wr->num_sge);
2406
2407         return sg_nents;
2408 }
2409
2410 static int
2411 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2412                struct isert_rdma_wr *wr)
2413 {
2414         struct se_cmd *se_cmd = &cmd->se_cmd;
2415         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2416         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2417         struct isert_data_buf *data = &wr->data;
2418         struct ib_send_wr *send_wr;
2419         struct ib_sge *ib_sge;
2420         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2421         int ret = 0, i, ib_sge_cnt;
2422
2423         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2424
2425         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2426         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2427                                  se_cmd->t_data_nents, se_cmd->data_length,
2428                                  offset, wr->iser_ib_op, &wr->data);
2429         if (ret)
2430                 return ret;
2431
2432         data_left = data->len;
2433         offset = data->offset;
2434
2435         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2436         if (!ib_sge) {
2437                 pr_warn("Unable to allocate ib_sge\n");
2438                 ret = -ENOMEM;
2439                 goto unmap_cmd;
2440         }
2441         wr->ib_sge = ib_sge;
2442
2443         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2444         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2445                                 GFP_KERNEL);
2446         if (!wr->send_wr) {
2447                 pr_debug("Unable to allocate wr->send_wr\n");
2448                 ret = -ENOMEM;
2449                 goto unmap_cmd;
2450         }
2451
2452         wr->isert_cmd = isert_cmd;
2453         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2454
2455         for (i = 0; i < wr->send_wr_num; i++) {
2456                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2457                 data_len = min(data_left, rdma_write_max);
2458
2459                 send_wr->send_flags = 0;
2460                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2461                         send_wr->opcode = IB_WR_RDMA_WRITE;
2462                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2463                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2464                         if (i + 1 == wr->send_wr_num)
2465                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2466                         else
2467                                 send_wr->next = &wr->send_wr[i + 1];
2468                 } else {
2469                         send_wr->opcode = IB_WR_RDMA_READ;
2470                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2471                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2472                         if (i + 1 == wr->send_wr_num)
2473                                 send_wr->send_flags = IB_SEND_SIGNALED;
2474                         else
2475                                 send_wr->next = &wr->send_wr[i + 1];
2476                 }
2477
2478                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2479                                         send_wr, data_len, offset);
2480                 ib_sge += ib_sge_cnt;
2481
2482                 offset += data_len;
2483                 va_offset += data_len;
2484                 data_left -= data_len;
2485         }
2486
2487         return 0;
2488 unmap_cmd:
2489         isert_unmap_data_buf(isert_conn, data);
2490
2491         return ret;
2492 }
2493
2494 static int
2495 isert_map_fr_pagelist(struct ib_device *ib_dev,
2496                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2497 {
2498         u64 start_addr, end_addr, page, chunk_start = 0;
2499         struct scatterlist *tmp_sg;
2500         int i = 0, new_chunk, last_ent, n_pages;
2501
2502         n_pages = 0;
2503         new_chunk = 1;
2504         last_ent = sg_nents - 1;
2505         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2506                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2507                 if (new_chunk)
2508                         chunk_start = start_addr;
2509                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2510
2511                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2512                          i, (unsigned long long)tmp_sg->dma_address,
2513                          tmp_sg->length);
2514
2515                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2516                         new_chunk = 0;
2517                         continue;
2518                 }
2519                 new_chunk = 1;
2520
2521                 page = chunk_start & PAGE_MASK;
2522                 do {
2523                         fr_pl[n_pages++] = page;
2524                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2525                                  n_pages - 1, page);
2526                         page += PAGE_SIZE;
2527                 } while (page < end_addr);
2528         }
2529
2530         return n_pages;
2531 }
2532
2533 static int
2534 isert_fast_reg_mr(struct isert_conn *isert_conn,
2535                   struct fast_reg_descriptor *fr_desc,
2536                   struct isert_data_buf *mem,
2537                   enum isert_indicator ind,
2538                   struct ib_sge *sge)
2539 {
2540         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2541         struct ib_mr *mr;
2542         struct ib_fast_reg_page_list *frpl;
2543         struct ib_send_wr fr_wr, inv_wr;
2544         struct ib_send_wr *bad_wr, *wr = NULL;
2545         int ret, pagelist_len;
2546         u32 page_off;
2547         u8 key;
2548
2549         if (mem->dma_nents == 1) {
2550                 sge->lkey = isert_conn->conn_mr->lkey;
2551                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2552                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2553                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2554                          __func__, __LINE__, sge->addr, sge->length,
2555                          sge->lkey);
2556                 return 0;
2557         }
2558
2559         if (ind == ISERT_DATA_KEY_VALID) {
2560                 /* Registering data buffer */
2561                 mr = fr_desc->data_mr;
2562                 frpl = fr_desc->data_frpl;
2563         } else {
2564                 /* Registering protection buffer */
2565                 mr = fr_desc->pi_ctx->prot_mr;
2566                 frpl = fr_desc->pi_ctx->prot_frpl;
2567         }
2568
2569         page_off = mem->offset % PAGE_SIZE;
2570
2571         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2572                  fr_desc, mem->nents, mem->offset);
2573
2574         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2575                                              &frpl->page_list[0]);
2576
2577         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2578                 memset(&inv_wr, 0, sizeof(inv_wr));
2579                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2580                 inv_wr.opcode = IB_WR_LOCAL_INV;
2581                 inv_wr.ex.invalidate_rkey = mr->rkey;
2582                 wr = &inv_wr;
2583                 /* Bump the key */
2584                 key = (u8)(mr->rkey & 0x000000FF);
2585                 ib_update_fast_reg_key(mr, ++key);
2586         }
2587
2588         /* Prepare FASTREG WR */
2589         memset(&fr_wr, 0, sizeof(fr_wr));
2590         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2591         fr_wr.opcode = IB_WR_FAST_REG_MR;
2592         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2593         fr_wr.wr.fast_reg.page_list = frpl;
2594         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2595         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2596         fr_wr.wr.fast_reg.length = mem->len;
2597         fr_wr.wr.fast_reg.rkey = mr->rkey;
2598         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2599
2600         if (!wr)
2601                 wr = &fr_wr;
2602         else
2603                 wr->next = &fr_wr;
2604
2605         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2606         if (ret) {
2607                 pr_err("fast registration failed, ret:%d\n", ret);
2608                 return ret;
2609         }
2610         fr_desc->ind &= ~ind;
2611
2612         sge->lkey = mr->lkey;
2613         sge->addr = frpl->page_list[0] + page_off;
2614         sge->length = mem->len;
2615
2616         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2617                  __func__, __LINE__, sge->addr, sge->length,
2618                  sge->lkey);
2619
2620         return ret;
2621 }
2622
2623 static inline void
2624 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2625                      struct ib_sig_domain *domain)
2626 {
2627         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2628         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2629         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2630         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2631         /*
2632          * At the moment we hard code those, but if in the future
2633          * the target core would like to use it, we will take it
2634          * from se_cmd.
2635          */
2636         domain->sig.dif.apptag_check_mask = 0xffff;
2637         domain->sig.dif.app_escape = true;
2638         domain->sig.dif.ref_escape = true;
2639         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2640             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2641                 domain->sig.dif.ref_remap = true;
2642 };
2643
2644 static int
2645 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2646 {
2647         switch (se_cmd->prot_op) {
2648         case TARGET_PROT_DIN_INSERT:
2649         case TARGET_PROT_DOUT_STRIP:
2650                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2651                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2652                 break;
2653         case TARGET_PROT_DOUT_INSERT:
2654         case TARGET_PROT_DIN_STRIP:
2655                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2656                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2657                 break;
2658         case TARGET_PROT_DIN_PASS:
2659         case TARGET_PROT_DOUT_PASS:
2660                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2661                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2662                 break;
2663         default:
2664                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2665                 return -EINVAL;
2666         }
2667
2668         return 0;
2669 }
2670
2671 static inline u8
2672 isert_set_prot_checks(u8 prot_checks)
2673 {
2674         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2675                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2676                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2677 }
2678
2679 static int
2680 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2681                  struct fast_reg_descriptor *fr_desc,
2682                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2683                  struct ib_sge *sig_sge)
2684 {
2685         struct ib_send_wr sig_wr, inv_wr;
2686         struct ib_send_wr *bad_wr, *wr = NULL;
2687         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2688         struct ib_sig_attrs sig_attrs;
2689         int ret;
2690         u32 key;
2691
2692         memset(&sig_attrs, 0, sizeof(sig_attrs));
2693         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2694         if (ret)
2695                 goto err;
2696
2697         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2698
2699         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2700                 memset(&inv_wr, 0, sizeof(inv_wr));
2701                 inv_wr.opcode = IB_WR_LOCAL_INV;
2702                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2703                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2704                 wr = &inv_wr;
2705                 /* Bump the key */
2706                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2707                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2708         }
2709
2710         memset(&sig_wr, 0, sizeof(sig_wr));
2711         sig_wr.opcode = IB_WR_REG_SIG_MR;
2712         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2713         sig_wr.sg_list = data_sge;
2714         sig_wr.num_sge = 1;
2715         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2716         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2717         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2718         if (se_cmd->t_prot_sg)
2719                 sig_wr.wr.sig_handover.prot = prot_sge;
2720
2721         if (!wr)
2722                 wr = &sig_wr;
2723         else
2724                 wr->next = &sig_wr;
2725
2726         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2727         if (ret) {
2728                 pr_err("fast registration failed, ret:%d\n", ret);
2729                 goto err;
2730         }
2731         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2732
2733         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2734         sig_sge->addr = 0;
2735         sig_sge->length = se_cmd->data_length;
2736         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2737             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2738                 /*
2739                  * We have protection guards on the wire
2740                  * so we need to set a larget transfer
2741                  */
2742                 sig_sge->length += se_cmd->prot_length;
2743
2744         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2745                  sig_sge->addr, sig_sge->length,
2746                  sig_sge->lkey);
2747 err:
2748         return ret;
2749 }
2750
2751 static int
2752 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2753                struct isert_rdma_wr *wr)
2754 {
2755         struct se_cmd *se_cmd = &cmd->se_cmd;
2756         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2757         struct isert_conn *isert_conn = conn->context;
2758         struct ib_sge data_sge;
2759         struct ib_send_wr *send_wr;
2760         struct fast_reg_descriptor *fr_desc = NULL;
2761         u32 offset;
2762         int ret = 0;
2763         unsigned long flags;
2764
2765         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2766
2767         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2768         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2769                                  se_cmd->t_data_nents, se_cmd->data_length,
2770                                  offset, wr->iser_ib_op, &wr->data);
2771         if (ret)
2772                 return ret;
2773
2774         if (wr->data.dma_nents != 1 ||
2775             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2776                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2777                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2778                                            struct fast_reg_descriptor, list);
2779                 list_del(&fr_desc->list);
2780                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2781                 wr->fr_desc = fr_desc;
2782         }
2783
2784         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2785                                 ISERT_DATA_KEY_VALID, &data_sge);
2786         if (ret)
2787                 goto unmap_cmd;
2788
2789         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2790                 struct ib_sge prot_sge, sig_sge;
2791
2792                 if (se_cmd->t_prot_sg) {
2793                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2794                                                  se_cmd->t_prot_sg,
2795                                                  se_cmd->t_prot_nents,
2796                                                  se_cmd->prot_length,
2797                                                  0, wr->iser_ib_op, &wr->prot);
2798                         if (ret)
2799                                 goto unmap_cmd;
2800
2801                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2802                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2803                         if (ret)
2804                                 goto unmap_prot_cmd;
2805                 }
2806
2807                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2808                                        &data_sge, &prot_sge, &sig_sge);
2809                 if (ret)
2810                         goto unmap_prot_cmd;
2811
2812                 fr_desc->ind |= ISERT_PROTECTED;
2813                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2814         } else
2815                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2816
2817         wr->ib_sge = &wr->s_ib_sge;
2818         wr->send_wr_num = 1;
2819         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2820         wr->send_wr = &wr->s_send_wr;
2821         wr->isert_cmd = isert_cmd;
2822
2823         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2824         send_wr->sg_list = &wr->s_ib_sge;
2825         send_wr->num_sge = 1;
2826         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2827         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2828                 send_wr->opcode = IB_WR_RDMA_WRITE;
2829                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2830                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2831                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2832                                       0 : IB_SEND_SIGNALED;
2833         } else {
2834                 send_wr->opcode = IB_WR_RDMA_READ;
2835                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2836                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2837                 send_wr->send_flags = IB_SEND_SIGNALED;
2838         }
2839
2840         return 0;
2841 unmap_prot_cmd:
2842         if (se_cmd->t_prot_sg)
2843                 isert_unmap_data_buf(isert_conn, &wr->prot);
2844 unmap_cmd:
2845         if (fr_desc) {
2846                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2847                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2848                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2849         }
2850         isert_unmap_data_buf(isert_conn, &wr->data);
2851
2852         return ret;
2853 }
2854
2855 static int
2856 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2857 {
2858         struct se_cmd *se_cmd = &cmd->se_cmd;
2859         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2860         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2861         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2862         struct isert_device *device = isert_conn->conn_device;
2863         struct ib_send_wr *wr_failed;
2864         int rc;
2865
2866         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2867                  isert_cmd, se_cmd->data_length);
2868         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2869         rc = device->reg_rdma_mem(conn, cmd, wr);
2870         if (rc) {
2871                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2872                 return rc;
2873         }
2874
2875         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2876                 /*
2877                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2878                  */
2879                 isert_create_send_desc(isert_conn, isert_cmd,
2880                                        &isert_cmd->tx_desc);
2881                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2882                                      &isert_cmd->tx_desc.iscsi_header);
2883                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2884                 isert_init_send_wr(isert_conn, isert_cmd,
2885                                    &isert_cmd->tx_desc.send_wr, false);
2886                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2887                 wr->send_wr_num += 1;
2888         }
2889
2890         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2891
2892         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2893         if (rc) {
2894                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2895                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2896         }
2897
2898         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2899                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2900                          "READ\n", isert_cmd);
2901         else
2902                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2903                          isert_cmd);
2904
2905         return 1;
2906 }
2907
2908 static int
2909 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2910 {
2911         struct se_cmd *se_cmd = &cmd->se_cmd;
2912         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2913         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2914         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2915         struct isert_device *device = isert_conn->conn_device;
2916         struct ib_send_wr *wr_failed;
2917         int rc;
2918
2919         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2920                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2921         wr->iser_ib_op = ISER_IB_RDMA_READ;
2922         rc = device->reg_rdma_mem(conn, cmd, wr);
2923         if (rc) {
2924                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2925                 return rc;
2926         }
2927
2928         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2929
2930         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2931         if (rc) {
2932                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2933                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2934         }
2935         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2936                  isert_cmd);
2937
2938         return 0;
2939 }
2940
2941 static int
2942 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2943 {
2944         int ret;
2945
2946         switch (state) {
2947         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2948                 ret = isert_put_nopin(cmd, conn, false);
2949                 break;
2950         default:
2951                 pr_err("Unknown immediate state: 0x%02x\n", state);
2952                 ret = -EINVAL;
2953                 break;
2954         }
2955
2956         return ret;
2957 }
2958
2959 static int
2960 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2961 {
2962         int ret;
2963
2964         switch (state) {
2965         case ISTATE_SEND_LOGOUTRSP:
2966                 ret = isert_put_logout_rsp(cmd, conn);
2967                 if (!ret) {
2968                         pr_debug("Returning iSER Logout -EAGAIN\n");
2969                         ret = -EAGAIN;
2970                 }
2971                 break;
2972         case ISTATE_SEND_NOPIN:
2973                 ret = isert_put_nopin(cmd, conn, true);
2974                 break;
2975         case ISTATE_SEND_TASKMGTRSP:
2976                 ret = isert_put_tm_rsp(cmd, conn);
2977                 break;
2978         case ISTATE_SEND_REJECT:
2979                 ret = isert_put_reject(cmd, conn);
2980                 break;
2981         case ISTATE_SEND_TEXTRSP:
2982                 ret = isert_put_text_rsp(cmd, conn);
2983                 break;
2984         case ISTATE_SEND_STATUS:
2985                 /*
2986                  * Special case for sending non GOOD SCSI status from TX thread
2987                  * context during pre se_cmd excecution failure.
2988                  */
2989                 ret = isert_put_response(conn, cmd);
2990                 break;
2991         default:
2992                 pr_err("Unknown response state: 0x%02x\n", state);
2993                 ret = -EINVAL;
2994                 break;
2995         }
2996
2997         return ret;
2998 }
2999
3000 static int
3001 isert_setup_np(struct iscsi_np *np,
3002                struct __kernel_sockaddr_storage *ksockaddr)
3003 {
3004         struct isert_np *isert_np;
3005         struct rdma_cm_id *isert_lid;
3006         struct sockaddr *sa;
3007         int ret;
3008
3009         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3010         if (!isert_np) {
3011                 pr_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
3019         sa = (struct sockaddr *)ksockaddr;
3020         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3021         /*
3022          * Setup the np->np_sockaddr from the passed sockaddr setup
3023          * in iscsi_target_configfs.c code..
3024          */
3025         memcpy(&np->np_sockaddr, ksockaddr,
3026                sizeof(struct __kernel_sockaddr_storage));
3027
3028         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3029                                 IB_QPT_RC);
3030         if (IS_ERR(isert_lid)) {
3031                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3032                        PTR_ERR(isert_lid));
3033                 ret = PTR_ERR(isert_lid);
3034                 goto out;
3035         }
3036
3037         ret = rdma_bind_addr(isert_lid, sa);
3038         if (ret) {
3039                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3040                 goto out_lid;
3041         }
3042
3043         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3044         if (ret) {
3045                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3046                 goto out_lid;
3047         }
3048
3049         isert_np->np_cm_id = isert_lid;
3050         np->np_context = isert_np;
3051         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3052
3053         return 0;
3054
3055 out_lid:
3056         rdma_destroy_id(isert_lid);
3057 out:
3058         kfree(isert_np);
3059         return ret;
3060 }
3061
3062 static int
3063 isert_rdma_accept(struct isert_conn *isert_conn)
3064 {
3065         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3066         struct rdma_conn_param cp;
3067         int ret;
3068
3069         memset(&cp, 0, sizeof(struct rdma_conn_param));
3070         cp.initiator_depth = isert_conn->initiator_depth;
3071         cp.retry_count = 7;
3072         cp.rnr_retry_count = 7;
3073
3074         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3075
3076         ret = rdma_accept(cm_id, &cp);
3077         if (ret) {
3078                 pr_err("rdma_accept() failed with: %d\n", ret);
3079                 return ret;
3080         }
3081
3082         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3083
3084         return 0;
3085 }
3086
3087 static int
3088 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3089 {
3090         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3091         int ret;
3092
3093         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3094         /*
3095          * For login requests after the first PDU, isert_rx_login_req() will
3096          * kick schedule_delayed_work(&conn->login_work) as the packet is
3097          * received, which turns this callback from iscsi_target_do_login_rx()
3098          * into a NOP.
3099          */
3100         if (!login->first_request)
3101                 return 0;
3102
3103         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3104         if (ret)
3105                 return ret;
3106
3107         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3108         return 0;
3109 }
3110
3111 static void
3112 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3113                     struct isert_conn *isert_conn)
3114 {
3115         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3116         struct rdma_route *cm_route = &cm_id->route;
3117         struct sockaddr_in *sock_in;
3118         struct sockaddr_in6 *sock_in6;
3119
3120         conn->login_family = np->np_sockaddr.ss_family;
3121
3122         if (np->np_sockaddr.ss_family == AF_INET6) {
3123                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3124                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3125                          &sock_in6->sin6_addr.in6_u);
3126                 conn->login_port = ntohs(sock_in6->sin6_port);
3127
3128                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3129                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3130                          &sock_in6->sin6_addr.in6_u);
3131                 conn->local_port = ntohs(sock_in6->sin6_port);
3132         } else {
3133                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3134                 sprintf(conn->login_ip, "%pI4",
3135                         &sock_in->sin_addr.s_addr);
3136                 conn->login_port = ntohs(sock_in->sin_port);
3137
3138                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3139                 sprintf(conn->local_ip, "%pI4",
3140                         &sock_in->sin_addr.s_addr);
3141                 conn->local_port = ntohs(sock_in->sin_port);
3142         }
3143 }
3144
3145 static int
3146 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3147 {
3148         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3149         struct isert_conn *isert_conn;
3150         int max_accept = 0, ret;
3151
3152 accept_wait:
3153         ret = down_interruptible(&isert_np->np_sem);
3154         if (ret || max_accept > 5)
3155                 return -ENODEV;
3156
3157         spin_lock_bh(&np->np_thread_lock);
3158         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3159                 spin_unlock_bh(&np->np_thread_lock);
3160                 pr_debug("np_thread_state %d for isert_accept_np\n",
3161                          np->np_thread_state);
3162                 /**
3163                  * No point in stalling here when np_thread
3164                  * is in state RESET/SHUTDOWN/EXIT - bail
3165                  **/
3166                 return -ENODEV;
3167         }
3168         spin_unlock_bh(&np->np_thread_lock);
3169
3170         mutex_lock(&isert_np->np_accept_mutex);
3171         if (list_empty(&isert_np->np_accept_list)) {
3172                 mutex_unlock(&isert_np->np_accept_mutex);
3173                 max_accept++;
3174                 goto accept_wait;
3175         }
3176         isert_conn = list_first_entry(&isert_np->np_accept_list,
3177                         struct isert_conn, conn_accept_node);
3178         list_del_init(&isert_conn->conn_accept_node);
3179         mutex_unlock(&isert_np->np_accept_mutex);
3180
3181         conn->context = isert_conn;
3182         isert_conn->conn = conn;
3183         max_accept = 0;
3184
3185         ret = isert_rdma_post_recvl(isert_conn);
3186         if (ret)
3187                 return ret;
3188
3189         ret = isert_rdma_accept(isert_conn);
3190         if (ret)
3191                 return ret;
3192
3193         isert_set_conn_info(np, conn, isert_conn);
3194
3195         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3196         return 0;
3197 }
3198
3199 static void
3200 isert_free_np(struct iscsi_np *np)
3201 {
3202         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3203
3204         if (isert_np->np_cm_id)
3205                 rdma_destroy_id(isert_np->np_cm_id);
3206
3207         np->np_context = NULL;
3208         kfree(isert_np);
3209 }
3210
3211 static void isert_wait_conn(struct iscsi_conn *conn)
3212 {
3213         struct isert_conn *isert_conn = conn->context;
3214
3215         pr_debug("isert_wait_conn: Starting \n");
3216
3217         mutex_lock(&isert_conn->conn_mutex);
3218         if (isert_conn->conn_cm_id && !isert_conn->disconnect) {
3219                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3220                 rdma_disconnect(isert_conn->conn_cm_id);
3221         }
3222         /*
3223          * Only wait for conn_wait_comp_err if the isert_conn made it
3224          * into full feature phase..
3225          */
3226         if (isert_conn->state == ISER_CONN_INIT) {
3227                 mutex_unlock(&isert_conn->conn_mutex);
3228                 return;
3229         }
3230         if (isert_conn->state == ISER_CONN_UP)
3231                 isert_conn->state = ISER_CONN_TERMINATING;
3232         mutex_unlock(&isert_conn->conn_mutex);
3233
3234         wait_for_completion(&isert_conn->conn_wait_comp_err);
3235
3236         wait_for_completion(&isert_conn->conn_wait);
3237         isert_put_conn(isert_conn);
3238 }
3239
3240 static void isert_free_conn(struct iscsi_conn *conn)
3241 {
3242         struct isert_conn *isert_conn = conn->context;
3243
3244         isert_put_conn(isert_conn);
3245 }
3246
3247 static struct iscsit_transport iser_target_transport = {
3248         .name                   = "IB/iSER",
3249         .transport_type         = ISCSI_INFINIBAND,
3250         .priv_size              = sizeof(struct isert_cmd),
3251         .owner                  = THIS_MODULE,
3252         .iscsit_setup_np        = isert_setup_np,
3253         .iscsit_accept_np       = isert_accept_np,
3254         .iscsit_free_np         = isert_free_np,
3255         .iscsit_wait_conn       = isert_wait_conn,
3256         .iscsit_free_conn       = isert_free_conn,
3257         .iscsit_get_login_rx    = isert_get_login_rx,
3258         .iscsit_put_login_tx    = isert_put_login_tx,
3259         .iscsit_immediate_queue = isert_immediate_queue,
3260         .iscsit_response_queue  = isert_response_queue,
3261         .iscsit_get_dataout     = isert_get_dataout,
3262         .iscsit_queue_data_in   = isert_put_datain,
3263         .iscsit_queue_status    = isert_put_response,
3264         .iscsit_aborted_task    = isert_aborted_task,
3265         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3266 };
3267
3268 static int __init isert_init(void)
3269 {
3270         int ret;
3271
3272         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3273         if (!isert_rx_wq) {
3274                 pr_err("Unable to allocate isert_rx_wq\n");
3275                 return -ENOMEM;
3276         }
3277
3278         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3279         if (!isert_comp_wq) {
3280                 pr_err("Unable to allocate isert_comp_wq\n");
3281                 ret = -ENOMEM;
3282                 goto destroy_rx_wq;
3283         }
3284
3285         iscsit_register_transport(&iser_target_transport);
3286         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3287         return 0;
3288
3289 destroy_rx_wq:
3290         destroy_workqueue(isert_rx_wq);
3291         return ret;
3292 }
3293
3294 static void __exit isert_exit(void)
3295 {
3296         flush_scheduled_work();
3297         destroy_workqueue(isert_comp_wq);
3298         destroy_workqueue(isert_rx_wq);
3299         iscsit_unregister_transport(&iser_target_transport);
3300         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3301 }
3302
3303 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3304 MODULE_VERSION("0.1");
3305 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3306 MODULE_LICENSE("GPL");
3307
3308 module_init(isert_init);
3309 module_exit(isert_exit);