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_READ..
 119          */
 120         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 121         isert_conn->max_sge = attr.cap.max_send_sge;
 122
 123         attr.cap.max_recv_sge = 1;
 124         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 125         attr.qp_type = IB_QPT_RC;
 126         if (protection)
 127                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 128
 129         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 130                  cma_id->device);
 131         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 132                  isert_conn->conn_pd->device);
 133
 134         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 135         if (ret) {
 136                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 137                 return ret;
 138         }
 139         isert_conn->conn_qp = cma_id->qp;
 140         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 141
 142         return 0;
 143 }
 144
 145 static void
 146 isert_cq_event_callback(struct ib_event *e, void *context)
 147 {
 148         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 149 }
 150
 151 static int
 152 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 153 {
 154         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 155         struct iser_rx_desc *rx_desc;
 156         struct ib_sge *rx_sg;
 157         u64 dma_addr;
 158         int i, j;
 159
 160         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 161                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 162         if (!isert_conn->conn_rx_descs)
 163                 goto fail;
 164
 165         rx_desc = isert_conn->conn_rx_descs;
 166
 167         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 168                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 169                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 170                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 171                         goto dma_map_fail;
 172
 173                 rx_desc->dma_addr = dma_addr;
 174
 175                 rx_sg = &rx_desc->rx_sg;
 176                 rx_sg->addr = rx_desc->dma_addr;
 177                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 178                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 179         }
 180
 181         isert_conn->conn_rx_desc_head = 0;
 182         return 0;
 183
 184 dma_map_fail:
 185         rx_desc = isert_conn->conn_rx_descs;
 186         for (j = 0; j < i; j++, rx_desc++) {
 187                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 188                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 189         }
 190         kfree(isert_conn->conn_rx_descs);
 191         isert_conn->conn_rx_descs = NULL;
 192 fail:
 193         return -ENOMEM;
 194 }
 195
 196 static void
 197 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 198 {
 199         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 200         struct iser_rx_desc *rx_desc;
 201         int i;
 202
 203         if (!isert_conn->conn_rx_descs)
 204                 return;
 205
 206         rx_desc = isert_conn->conn_rx_descs;
 207         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 208                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 209                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 210         }
 211
 212         kfree(isert_conn->conn_rx_descs);
 213         isert_conn->conn_rx_descs = NULL;
 214 }
 215
 216 static void isert_cq_tx_work(struct work_struct *);
 217 static void isert_cq_tx_callback(struct ib_cq *, void *);
 218 static void isert_cq_rx_work(struct work_struct *);
 219 static void isert_cq_rx_callback(struct ib_cq *, void *);
 220
 221 static int
 222 isert_create_device_ib_res(struct isert_device *device)
 223 {
 224         struct ib_device *ib_dev = device->ib_device;
 225         struct isert_cq_desc *cq_desc;
 226         struct ib_device_attr *dev_attr;
 227         int ret = 0, i, j;
 228
 229         dev_attr = &device->dev_attr;
 230         ret = isert_query_device(ib_dev, dev_attr);
 231         if (ret)
 232                 return ret;
 233
 234         /* asign function handlers */
 235         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 236             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 237                 device->use_fastreg = 1;
 238                 device->reg_rdma_mem = isert_reg_rdma;
 239                 device->unreg_rdma_mem = isert_unreg_rdma;
 240         } else {
 241                 device->use_fastreg = 0;
 242                 device->reg_rdma_mem = isert_map_rdma;
 243                 device->unreg_rdma_mem = isert_unmap_cmd;
 244         }
 245
 246         /* Check signature cap */
 247         device->pi_capable = dev_attr->device_cap_flags &
 248                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 249
 250         device->cqs_used = min_t(int, num_online_cpus(),
 251                                  device->ib_device->num_comp_vectors);
 252         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 253         pr_debug("Using %d CQs, device %s supports %d vectors support "
 254                  "Fast registration %d pi_capable %d\n",
 255                  device->cqs_used, device->ib_device->name,
 256                  device->ib_device->num_comp_vectors, device->use_fastreg,
 257                  device->pi_capable);
 258         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 259                                 device->cqs_used, GFP_KERNEL);
 260         if (!device->cq_desc) {
 261                 pr_err("Unable to allocate device->cq_desc\n");
 262                 return -ENOMEM;
 263         }
 264         cq_desc = device->cq_desc;
 265
 266         for (i = 0; i < device->cqs_used; i++) {
 267                 cq_desc[i].device = device;
 268                 cq_desc[i].cq_index = i;
 269
 270                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 271                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 272                                                 isert_cq_rx_callback,
 273                                                 isert_cq_event_callback,
 274                                                 (void *)&cq_desc[i],
 275                                                 ISER_MAX_RX_CQ_LEN, i);
 276                 if (IS_ERR(device->dev_rx_cq[i])) {
 277                         ret = PTR_ERR(device->dev_rx_cq[i]);
 278                         device->dev_rx_cq[i] = NULL;
 279                         goto out_cq;
 280                 }
 281
 282                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 283                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 284                                                 isert_cq_tx_callback,
 285                                                 isert_cq_event_callback,
 286                                                 (void *)&cq_desc[i],
 287                                                 ISER_MAX_TX_CQ_LEN, i);
 288                 if (IS_ERR(device->dev_tx_cq[i])) {
 289                         ret = PTR_ERR(device->dev_tx_cq[i]);
 290                         device->dev_tx_cq[i] = NULL;
 291                         goto out_cq;
 292                 }
 293
 294                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 295                 if (ret)
 296                         goto out_cq;
 297
 298                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 299                 if (ret)
 300                         goto out_cq;
 301         }
 302
 303         return 0;
 304
 305 out_cq:
 306         for (j = 0; j < i; j++) {
 307                 cq_desc = &device->cq_desc[j];
 308
 309                 if (device->dev_rx_cq[j]) {
 310                         cancel_work_sync(&cq_desc->cq_rx_work);
 311                         ib_destroy_cq(device->dev_rx_cq[j]);
 312                 }
 313                 if (device->dev_tx_cq[j]) {
 314                         cancel_work_sync(&cq_desc->cq_tx_work);
 315                         ib_destroy_cq(device->dev_tx_cq[j]);
 316                 }
 317         }
 318         kfree(device->cq_desc);
 319
 320         return ret;
 321 }
 322
 323 static void
 324 isert_free_device_ib_res(struct isert_device *device)
 325 {
 326         struct isert_cq_desc *cq_desc;
 327         int i;
 328
 329         for (i = 0; i < device->cqs_used; i++) {
 330                 cq_desc = &device->cq_desc[i];
 331
 332                 cancel_work_sync(&cq_desc->cq_rx_work);
 333                 cancel_work_sync(&cq_desc->cq_tx_work);
 334                 ib_destroy_cq(device->dev_rx_cq[i]);
 335                 ib_destroy_cq(device->dev_tx_cq[i]);
 336                 device->dev_rx_cq[i] = NULL;
 337                 device->dev_tx_cq[i] = NULL;
 338         }
 339
 340         kfree(device->cq_desc);
 341 }
 342
 343 static void
 344 isert_device_try_release(struct isert_device *device)
 345 {
 346         mutex_lock(&device_list_mutex);
 347         device->refcount--;
 348         if (!device->refcount) {
 349                 isert_free_device_ib_res(device);
 350                 list_del(&device->dev_node);
 351                 kfree(device);
 352         }
 353         mutex_unlock(&device_list_mutex);
 354 }
 355
 356 static struct isert_device *
 357 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 358 {
 359         struct isert_device *device;
 360         int ret;
 361
 362         mutex_lock(&device_list_mutex);
 363         list_for_each_entry(device, &device_list, dev_node) {
 364                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 365                         device->refcount++;
 366                         mutex_unlock(&device_list_mutex);
 367                         return device;
 368                 }
 369         }
 370
 371         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 372         if (!device) {
 373                 mutex_unlock(&device_list_mutex);
 374                 return ERR_PTR(-ENOMEM);
 375         }
 376
 377         INIT_LIST_HEAD(&device->dev_node);
 378
 379         device->ib_device = cma_id->device;
 380         ret = isert_create_device_ib_res(device);
 381         if (ret) {
 382                 kfree(device);
 383                 mutex_unlock(&device_list_mutex);
 384                 return ERR_PTR(ret);
 385         }
 386
 387         device->refcount++;
 388         list_add_tail(&device->dev_node, &device_list);
 389         mutex_unlock(&device_list_mutex);
 390
 391         return device;
 392 }
 393
 394 static void
 395 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 396 {
 397         struct fast_reg_descriptor *fr_desc, *tmp;
 398         int i = 0;
 399
 400         if (list_empty(&isert_conn->conn_fr_pool))
 401                 return;
 402
 403         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 404
 405         list_for_each_entry_safe(fr_desc, tmp,
 406                                  &isert_conn->conn_fr_pool, list) {
 407                 list_del(&fr_desc->list);
 408                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 409                 ib_dereg_mr(fr_desc->data_mr);
 410                 if (fr_desc->pi_ctx) {
 411                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 412                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 413                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 414                         kfree(fr_desc->pi_ctx);
 415                 }
 416                 kfree(fr_desc);
 417                 ++i;
 418         }
 419
 420         if (i < isert_conn->conn_fr_pool_size)
 421                 pr_warn("Pool still has %d regions registered\n",
 422                         isert_conn->conn_fr_pool_size - i);
 423 }
 424
 425 static int
 426 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 427                      struct fast_reg_descriptor *fr_desc, u8 protection)
 428 {
 429         int ret;
 430
 431         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 432                                                          ISCSI_ISER_SG_TABLESIZE);
 433         if (IS_ERR(fr_desc->data_frpl)) {
 434                 pr_err("Failed to allocate data frpl err=%ld\n",
 435                        PTR_ERR(fr_desc->data_frpl));
 436                 return PTR_ERR(fr_desc->data_frpl);
 437         }
 438
 439         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 440         if (IS_ERR(fr_desc->data_mr)) {
 441                 pr_err("Failed to allocate data frmr err=%ld\n",
 442                        PTR_ERR(fr_desc->data_mr));
 443                 ret = PTR_ERR(fr_desc->data_mr);
 444                 goto err_data_frpl;
 445         }
 446         pr_debug("Create fr_desc %p page_list %p\n",
 447                  fr_desc, fr_desc->data_frpl->page_list);
 448         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 449
 450         if (protection) {
 451                 struct ib_mr_init_attr mr_init_attr = {0};
 452                 struct pi_context *pi_ctx;
 453
 454                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 455                 if (!fr_desc->pi_ctx) {
 456                         pr_err("Failed to allocate pi context\n");
 457                         ret = -ENOMEM;
 458                         goto err_data_mr;
 459                 }
 460                 pi_ctx = fr_desc->pi_ctx;
 461
 462                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 463                                                     ISCSI_ISER_SG_TABLESIZE);
 464                 if (IS_ERR(pi_ctx->prot_frpl)) {
 465                         pr_err("Failed to allocate prot frpl err=%ld\n",
 466                                PTR_ERR(pi_ctx->prot_frpl));
 467                         ret = PTR_ERR(pi_ctx->prot_frpl);
 468                         goto err_pi_ctx;
 469                 }
 470
 471                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 472                 if (IS_ERR(pi_ctx->prot_mr)) {
 473                         pr_err("Failed to allocate prot frmr err=%ld\n",
 474                                PTR_ERR(pi_ctx->prot_mr));
 475                         ret = PTR_ERR(pi_ctx->prot_mr);
 476                         goto err_prot_frpl;
 477                 }
 478                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 479
 480                 mr_init_attr.max_reg_descriptors = 2;
 481                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 482                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 483                 if (IS_ERR(pi_ctx->sig_mr)) {
 484                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 485                                PTR_ERR(pi_ctx->sig_mr));
 486                         ret = PTR_ERR(pi_ctx->sig_mr);
 487                         goto err_prot_mr;
 488                 }
 489                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 490         }
 491         fr_desc->ind &= ~ISERT_PROTECTED;
 492
 493         return 0;
 494 err_prot_mr:
 495         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 496 err_prot_frpl:
 497         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 498 err_pi_ctx:
 499         kfree(fr_desc->pi_ctx);
 500 err_data_mr:
 501         ib_dereg_mr(fr_desc->data_mr);
 502 err_data_frpl:
 503         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 504
 505         return ret;
 506 }
 507
 508 static int
 509 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 510 {
 511         struct fast_reg_descriptor *fr_desc;
 512         struct isert_device *device = isert_conn->conn_device;
 513         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 514         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 515         int i, ret, tag_num;
 516         /*
 517          * Setup the number of FRMRs based upon the number of tags
 518          * available to session in iscsi_target_locate_portal().
 519          */
 520         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 521         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 522
 523         isert_conn->conn_fr_pool_size = 0;
 524         for (i = 0; i < tag_num; i++) {
 525                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 526                 if (!fr_desc) {
 527                         pr_err("Failed to allocate fast_reg descriptor\n");
 528                         ret = -ENOMEM;
 529                         goto err;
 530                 }
 531
 532                 ret = isert_create_fr_desc(device->ib_device,
 533                                            isert_conn->conn_pd, fr_desc,
 534                                            pi_support);
 535                 if (ret) {
 536                         pr_err("Failed to create fastreg descriptor err=%d\n",
 537                                ret);
 538                         kfree(fr_desc);
 539                         goto err;
 540                 }
 541
 542                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 543                 isert_conn->conn_fr_pool_size++;
 544         }
 545
 546         pr_debug("Creating conn %p fastreg pool size=%d",
 547                  isert_conn, isert_conn->conn_fr_pool_size);
 548
 549         return 0;
 550
 551 err:
 552         isert_conn_free_fastreg_pool(isert_conn);
 553         return ret;
 554 }
 555
 556 static int
 557 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 558 {
 559         struct iscsi_np *np = cma_id->context;
 560         struct isert_np *isert_np = np->np_context;
 561         struct isert_conn *isert_conn;
 562         struct isert_device *device;
 563         struct ib_device *ib_dev = cma_id->device;
 564         int ret = 0;
 565         u8 pi_support;
 566
 567         spin_lock_bh(&np->np_thread_lock);
 568         if (!np->enabled) {
 569                 spin_unlock_bh(&np->np_thread_lock);
 570                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 571                 return rdma_reject(cma_id, NULL, 0);
 572         }
 573         spin_unlock_bh(&np->np_thread_lock);
 574
 575         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 576                  cma_id, cma_id->context);
 577
 578         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 579         if (!isert_conn) {
 580                 pr_err("Unable to allocate isert_conn\n");
 581                 return -ENOMEM;
 582         }
 583         isert_conn->state = ISER_CONN_INIT;
 584         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 585         init_completion(&isert_conn->conn_login_comp);
 586         init_completion(&isert_conn->conn_wait);
 587         init_completion(&isert_conn->conn_wait_comp_err);
 588         kref_init(&isert_conn->conn_kref);
 589         kref_get(&isert_conn->conn_kref);
 590         mutex_init(&isert_conn->conn_mutex);
 591         spin_lock_init(&isert_conn->conn_lock);
 592         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 593
 594         cma_id->context = isert_conn;
 595         isert_conn->conn_cm_id = cma_id;
 596         isert_conn->responder_resources = event->param.conn.responder_resources;
 597         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 598         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 599                  isert_conn->responder_resources, isert_conn->initiator_depth);
 600
 601         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 602                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 603         if (!isert_conn->login_buf) {
 604                 pr_err("Unable to allocate isert_conn->login_buf\n");
 605                 ret = -ENOMEM;
 606                 goto out;
 607         }
 608
 609         isert_conn->login_req_buf = isert_conn->login_buf;
 610         isert_conn->login_rsp_buf = isert_conn->login_buf +
 611                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 612         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 613                  isert_conn->login_buf, isert_conn->login_req_buf,
 614                  isert_conn->login_rsp_buf);
 615
 616         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 617                                 (void *)isert_conn->login_req_buf,
 618                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 619
 620         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 621         if (ret) {
 622                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 623                        ret);
 624                 isert_conn->login_req_dma = 0;
 625                 goto out_login_buf;
 626         }
 627
 628         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 629                                         (void *)isert_conn->login_rsp_buf,
 630                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 631
 632         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 633         if (ret) {
 634                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 635                        ret);
 636                 isert_conn->login_rsp_dma = 0;
 637                 goto out_req_dma_map;
 638         }
 639
 640         device = isert_device_find_by_ib_dev(cma_id);
 641         if (IS_ERR(device)) {
 642                 ret = PTR_ERR(device);
 643                 goto out_rsp_dma_map;
 644         }
 645
 646         isert_conn->conn_device = device;
 647         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 648         if (IS_ERR(isert_conn->conn_pd)) {
 649                 ret = PTR_ERR(isert_conn->conn_pd);
 650                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 651                        isert_conn, ret);
 652                 goto out_pd;
 653         }
 654
 655         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 656                                            IB_ACCESS_LOCAL_WRITE);
 657         if (IS_ERR(isert_conn->conn_mr)) {
 658                 ret = PTR_ERR(isert_conn->conn_mr);
 659                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 660                        isert_conn, ret);
 661                 goto out_mr;
 662         }
 663
 664         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 665         if (pi_support && !device->pi_capable) {
 666                 pr_err("Protection information requested but not supported\n");
 667                 ret = -EINVAL;
 668                 goto out_mr;
 669         }
 670
 671         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 672         if (ret)
 673                 goto out_conn_dev;
 674
 675         mutex_lock(&isert_np->np_accept_mutex);
 676         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 677         mutex_unlock(&isert_np->np_accept_mutex);
 678
 679         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 680         up(&isert_np->np_sem);
 681         return 0;
 682
 683 out_conn_dev:
 684         ib_dereg_mr(isert_conn->conn_mr);
 685 out_mr:
 686         ib_dealloc_pd(isert_conn->conn_pd);
 687 out_pd:
 688         isert_device_try_release(device);
 689 out_rsp_dma_map:
 690         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 691                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 692 out_req_dma_map:
 693         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 694                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 695 out_login_buf:
 696         kfree(isert_conn->login_buf);
 697 out:
 698         kfree(isert_conn);
 699         return ret;
 700 }
 701
 702 static void
 703 isert_connect_release(struct isert_conn *isert_conn)
 704 {
 705         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 706         struct isert_device *device = isert_conn->conn_device;
 707         int cq_index;
 708
 709         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 710
 711         if (device && device->use_fastreg)
 712                 isert_conn_free_fastreg_pool(isert_conn);
 713
 714         if (isert_conn->conn_qp) {
 715                 cq_index = ((struct isert_cq_desc *)
 716                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 717                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 718                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 719
 720                 rdma_destroy_qp(isert_conn->conn_cm_id);
 721         }
 722
 723         isert_free_rx_descriptors(isert_conn);
 724         rdma_destroy_id(isert_conn->conn_cm_id);
 725
 726         ib_dereg_mr(isert_conn->conn_mr);
 727         ib_dealloc_pd(isert_conn->conn_pd);
 728
 729         if (isert_conn->login_buf) {
 730                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 731                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 732                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 733                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 734                                     DMA_FROM_DEVICE);
 735                 kfree(isert_conn->login_buf);
 736         }
 737         kfree(isert_conn);
 738
 739         if (device)
 740                 isert_device_try_release(device);
 741
 742         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 743 }
 744
 745 static void
 746 isert_connected_handler(struct rdma_cm_id *cma_id)
 747 {
 748         return;
 749 }
 750
 751 static void
 752 isert_release_conn_kref(struct kref *kref)
 753 {
 754         struct isert_conn *isert_conn = container_of(kref,
 755                                 struct isert_conn, conn_kref);
 756
 757         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 758                  current->comm, current->pid);
 759
 760         isert_connect_release(isert_conn);
 761 }
 762
 763 static void
 764 isert_put_conn(struct isert_conn *isert_conn)
 765 {
 766         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 767 }
 768
 769 static void
 770 isert_disconnect_work(struct work_struct *work)
 771 {
 772         struct isert_conn *isert_conn = container_of(work,
 773                                 struct isert_conn, conn_logout_work);
 774
 775         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 776         mutex_lock(&isert_conn->conn_mutex);
 777         if (isert_conn->state == ISER_CONN_UP)
 778                 isert_conn->state = ISER_CONN_TERMINATING;
 779
 780         if (isert_conn->post_recv_buf_count == 0 &&
 781             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 782                 mutex_unlock(&isert_conn->conn_mutex);
 783                 goto wake_up;
 784         }
 785         if (!isert_conn->conn_cm_id) {
 786                 mutex_unlock(&isert_conn->conn_mutex);
 787                 isert_put_conn(isert_conn);
 788                 return;
 789         }
 790
 791         /* Send DREQ/DREP towards our initiator */
 792         rdma_disconnect(isert_conn->conn_cm_id);
 793
 794         mutex_unlock(&isert_conn->conn_mutex);
 795
 796 wake_up:
 797         complete(&isert_conn->conn_wait);
 798         isert_put_conn(isert_conn);
 799 }
 800
 801 static void
 802 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 803 {
 804         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 805
 806         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 807         schedule_work(&isert_conn->conn_logout_work);
 808 }
 809
 810 static int
 811 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 812 {
 813         int ret = 0;
 814
 815         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 816                  event->event, event->status, cma_id->context, cma_id);
 817
 818         switch (event->event) {
 819         case RDMA_CM_EVENT_CONNECT_REQUEST:
 820                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 821                 ret = isert_connect_request(cma_id, event);
 822                 break;
 823         case RDMA_CM_EVENT_ESTABLISHED:
 824                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 825                 isert_connected_handler(cma_id);
 826                 break;
 827         case RDMA_CM_EVENT_DISCONNECTED:
 828                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 829                 isert_disconnected_handler(cma_id);
 830                 break;
 831         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 832         case RDMA_CM_EVENT_ADDR_CHANGE:
 833                 break;
 834         case RDMA_CM_EVENT_CONNECT_ERROR:
 835         default:
 836                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 837                 break;
 838         }
 839
 840         if (ret != 0) {
 841                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 842                        event->event, ret);
 843                 dump_stack();
 844         }
 845
 846         return ret;
 847 }
 848
 849 static int
 850 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 851 {
 852         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 853         int i, ret;
 854         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 855         struct iser_rx_desc *rx_desc;
 856
 857         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 858                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 859                 rx_wr->wr_id    = (unsigned long)rx_desc;
 860                 rx_wr->sg_list  = &rx_desc->rx_sg;
 861                 rx_wr->num_sge  = 1;
 862                 rx_wr->next     = rx_wr + 1;
 863                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 864         }
 865
 866         rx_wr--;
 867         rx_wr->next = NULL; /* mark end of work requests list */
 868
 869         isert_conn->post_recv_buf_count += count;
 870         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 871                                 &rx_wr_failed);
 872         if (ret) {
 873                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 874                 isert_conn->post_recv_buf_count -= count;
 875         } else {
 876                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 877                 isert_conn->conn_rx_desc_head = rx_head;
 878         }
 879         return ret;
 880 }
 881
 882 static int
 883 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 884 {
 885         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 886         struct ib_send_wr send_wr, *send_wr_failed;
 887         int ret;
 888
 889         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 890                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 891
 892         send_wr.next    = NULL;
 893         send_wr.wr_id   = (unsigned long)tx_desc;
 894         send_wr.sg_list = tx_desc->tx_sg;
 895         send_wr.num_sge = tx_desc->num_sge;
 896         send_wr.opcode  = IB_WR_SEND;
 897         send_wr.send_flags = IB_SEND_SIGNALED;
 898
 899         atomic_inc(&isert_conn->post_send_buf_count);
 900
 901         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 902         if (ret) {
 903                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 904                 atomic_dec(&isert_conn->post_send_buf_count);
 905         }
 906
 907         return ret;
 908 }
 909
 910 static void
 911 isert_create_send_desc(struct isert_conn *isert_conn,
 912                        struct isert_cmd *isert_cmd,
 913                        struct iser_tx_desc *tx_desc)
 914 {
 915         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 916
 917         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 918                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 919
 920         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 921         tx_desc->iser_header.flags = ISER_VER;
 922
 923         tx_desc->num_sge = 1;
 924         tx_desc->isert_cmd = isert_cmd;
 925
 926         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 927                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 928                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 929         }
 930 }
 931
 932 static int
 933 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 934                    struct iser_tx_desc *tx_desc)
 935 {
 936         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 937         u64 dma_addr;
 938
 939         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 940                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 941         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 942                 pr_err("ib_dma_mapping_error() failed\n");
 943                 return -ENOMEM;
 944         }
 945
 946         tx_desc->dma_addr = dma_addr;
 947         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 948         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 949         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 950
 951         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 952                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 953                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 954
 955         return 0;
 956 }
 957
 958 static void
 959 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 960                    struct ib_send_wr *send_wr, bool coalesce)
 961 {
 962         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 963
 964         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 965         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 966         send_wr->opcode = IB_WR_SEND;
 967         send_wr->sg_list = &tx_desc->tx_sg[0];
 968         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 969         /*
 970          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 971          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 972          */
 973         mutex_lock(&isert_conn->conn_mutex);
 974         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 975             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 976                 tx_desc->llnode_active = true;
 977                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 978                 mutex_unlock(&isert_conn->conn_mutex);
 979                 return;
 980         }
 981         isert_conn->conn_comp_batch = 0;
 982         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 983         mutex_unlock(&isert_conn->conn_mutex);
 984
 985         send_wr->send_flags = IB_SEND_SIGNALED;
 986 }
 987
 988 static int
 989 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 990 {
 991         struct ib_recv_wr rx_wr, *rx_wr_fail;
 992         struct ib_sge sge;
 993         int ret;
 994
 995         memset(&sge, 0, sizeof(struct ib_sge));
 996         sge.addr = isert_conn->login_req_dma;
 997         sge.length = ISER_RX_LOGIN_SIZE;
 998         sge.lkey = isert_conn->conn_mr->lkey;
 999
1000         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1001                 sge.addr, sge.length, sge.lkey);
1002
1003         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1004         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1005         rx_wr.sg_list = &sge;
1006         rx_wr.num_sge = 1;
1007
1008         isert_conn->post_recv_buf_count++;
1009         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1010         if (ret) {
1011                 pr_err("ib_post_recv() failed: %d\n", ret);
1012                 isert_conn->post_recv_buf_count--;
1013         }
1014
1015         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1016         return ret;
1017 }
1018
1019 static int
1020 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1021                    u32 length)
1022 {
1023         struct isert_conn *isert_conn = conn->context;
1024         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1025         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1026         int ret;
1027
1028         isert_create_send_desc(isert_conn, NULL, tx_desc);
1029
1030         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1031                sizeof(struct iscsi_hdr));
1032
1033         isert_init_tx_hdrs(isert_conn, tx_desc);
1034
1035         if (length > 0) {
1036                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1037
1038                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1039                                            length, DMA_TO_DEVICE);
1040
1041                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1042
1043                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1044                                               length, DMA_TO_DEVICE);
1045
1046                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1047                 tx_dsg->length  = length;
1048                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1049                 tx_desc->num_sge = 2;
1050         }
1051         if (!login->login_failed) {
1052                 if (login->login_complete) {
1053                         if (isert_conn->conn_device->use_fastreg) {
1054                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1055
1056                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1057                                                                      pi_support);
1058                                 if (ret) {
1059                                         pr_err("Conn: %p failed to create"
1060                                                " fastreg pool\n", isert_conn);
1061                                         return ret;
1062                                 }
1063                         }
1064
1065                         ret = isert_alloc_rx_descriptors(isert_conn);
1066                         if (ret)
1067                                 return ret;
1068
1069                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1070                         if (ret)
1071                                 return ret;
1072
1073                         isert_conn->state = ISER_CONN_UP;
1074                         goto post_send;
1075                 }
1076
1077                 ret = isert_rdma_post_recvl(isert_conn);
1078                 if (ret)
1079                         return ret;
1080         }
1081 post_send:
1082         ret = isert_post_send(isert_conn, tx_desc);
1083         if (ret)
1084                 return ret;
1085
1086         return 0;
1087 }
1088
1089 static void
1090 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1091                    struct isert_conn *isert_conn)
1092 {
1093         struct iscsi_conn *conn = isert_conn->conn;
1094         struct iscsi_login *login = conn->conn_login;
1095         int size;
1096
1097         if (!login) {
1098                 pr_err("conn->conn_login is NULL\n");
1099                 dump_stack();
1100                 return;
1101         }
1102
1103         if (login->first_request) {
1104                 struct iscsi_login_req *login_req =
1105                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1106                 /*
1107                  * Setup the initial iscsi_login values from the leading
1108                  * login request PDU.
1109                  */
1110                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1111                 login->current_stage =
1112                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1113                          >> 2;
1114                 login->version_min      = login_req->min_version;
1115                 login->version_max      = login_req->max_version;
1116                 memcpy(login->isid, login_req->isid, 6);
1117                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1118                 login->init_task_tag    = login_req->itt;
1119                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1120                 login->cid              = be16_to_cpu(login_req->cid);
1121                 login->tsih             = be16_to_cpu(login_req->tsih);
1122         }
1123
1124         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1125
1126         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1127         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1128                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1129         memcpy(login->req_buf, &rx_desc->data[0], size);
1130
1131         if (login->first_request) {
1132                 complete(&isert_conn->conn_login_comp);
1133                 return;
1134         }
1135         schedule_delayed_work(&conn->login_work, 0);
1136 }
1137
1138 static struct iscsi_cmd
1139 *isert_allocate_cmd(struct iscsi_conn *conn)
1140 {
1141         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1142         struct isert_cmd *isert_cmd;
1143         struct iscsi_cmd *cmd;
1144
1145         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1146         if (!cmd) {
1147                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1148                 return NULL;
1149         }
1150         isert_cmd = iscsit_priv_cmd(cmd);
1151         isert_cmd->conn = isert_conn;
1152         isert_cmd->iscsi_cmd = cmd;
1153
1154         return cmd;
1155 }
1156
1157 static int
1158 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1159                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1160                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1161 {
1162         struct iscsi_conn *conn = isert_conn->conn;
1163         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1164         struct scatterlist *sg;
1165         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1166         bool dump_payload = false;
1167
1168         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1169         if (rc < 0)
1170                 return rc;
1171
1172         imm_data = cmd->immediate_data;
1173         imm_data_len = cmd->first_burst_len;
1174         unsol_data = cmd->unsolicited_data;
1175
1176         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1177         if (rc < 0) {
1178                 return 0;
1179         } else if (rc > 0) {
1180                 dump_payload = true;
1181                 goto sequence_cmd;
1182         }
1183
1184         if (!imm_data)
1185                 return 0;
1186
1187         sg = &cmd->se_cmd.t_data_sg[0];
1188         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1189
1190         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1191                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1192
1193         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1194
1195         cmd->write_data_done += imm_data_len;
1196
1197         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1198                 spin_lock_bh(&cmd->istate_lock);
1199                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1200                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1201                 spin_unlock_bh(&cmd->istate_lock);
1202         }
1203
1204 sequence_cmd:
1205         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1206
1207         if (!rc && dump_payload == false && unsol_data)
1208                 iscsit_set_unsoliticed_dataout(cmd);
1209
1210         return 0;
1211 }
1212
1213 static int
1214 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1215                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1216 {
1217         struct scatterlist *sg_start;
1218         struct iscsi_conn *conn = isert_conn->conn;
1219         struct iscsi_cmd *cmd = NULL;
1220         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1221         u32 unsol_data_len = ntoh24(hdr->dlength);
1222         int rc, sg_nents, sg_off, page_off;
1223
1224         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1225         if (rc < 0)
1226                 return rc;
1227         else if (!cmd)
1228                 return 0;
1229         /*
1230          * FIXME: Unexpected unsolicited_data out
1231          */
1232         if (!cmd->unsolicited_data) {
1233                 pr_err("Received unexpected solicited data payload\n");
1234                 dump_stack();
1235                 return -1;
1236         }
1237
1238         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1239                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1240
1241         sg_off = cmd->write_data_done / PAGE_SIZE;
1242         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1243         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1244         page_off = cmd->write_data_done % PAGE_SIZE;
1245         /*
1246          * FIXME: Non page-aligned unsolicited_data out
1247          */
1248         if (page_off) {
1249                 pr_err("Received unexpected non-page aligned data payload\n");
1250                 dump_stack();
1251                 return -1;
1252         }
1253         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1254                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1255
1256         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1257                             unsol_data_len);
1258
1259         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1260         if (rc < 0)
1261                 return rc;
1262
1263         return 0;
1264 }
1265
1266 static int
1267 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1268                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1269                      unsigned char *buf)
1270 {
1271         struct iscsi_conn *conn = isert_conn->conn;
1272         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1273         int rc;
1274
1275         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1276         if (rc < 0)
1277                 return rc;
1278         /*
1279          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1280          */
1281
1282         return iscsit_process_nop_out(conn, cmd, hdr);
1283 }
1284
1285 static int
1286 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1287                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1288                       struct iscsi_text *hdr)
1289 {
1290         struct iscsi_conn *conn = isert_conn->conn;
1291         u32 payload_length = ntoh24(hdr->dlength);
1292         int rc;
1293         unsigned char *text_in;
1294
1295         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1296         if (rc < 0)
1297                 return rc;
1298
1299         text_in = kzalloc(payload_length, GFP_KERNEL);
1300         if (!text_in) {
1301                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1302                        payload_length);
1303                 return -ENOMEM;
1304         }
1305         cmd->text_in_ptr = text_in;
1306
1307         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1308
1309         return iscsit_process_text_cmd(conn, cmd, hdr);
1310 }
1311
1312 static int
1313 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1314                 uint32_t read_stag, uint64_t read_va,
1315                 uint32_t write_stag, uint64_t write_va)
1316 {
1317         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1318         struct iscsi_conn *conn = isert_conn->conn;
1319         struct iscsi_session *sess = conn->sess;
1320         struct iscsi_cmd *cmd;
1321         struct isert_cmd *isert_cmd;
1322         int ret = -EINVAL;
1323         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1324
1325         if (sess->sess_ops->SessionType &&
1326            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1327                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1328                        " ignoring\n", opcode);
1329                 return 0;
1330         }
1331
1332         switch (opcode) {
1333         case ISCSI_OP_SCSI_CMD:
1334                 cmd = isert_allocate_cmd(conn);
1335                 if (!cmd)
1336                         break;
1337
1338                 isert_cmd = iscsit_priv_cmd(cmd);
1339                 isert_cmd->read_stag = read_stag;
1340                 isert_cmd->read_va = read_va;
1341                 isert_cmd->write_stag = write_stag;
1342                 isert_cmd->write_va = write_va;
1343
1344                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1345                                         rx_desc, (unsigned char *)hdr);
1346                 break;
1347         case ISCSI_OP_NOOP_OUT:
1348                 cmd = isert_allocate_cmd(conn);
1349                 if (!cmd)
1350                         break;
1351
1352                 isert_cmd = iscsit_priv_cmd(cmd);
1353                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1354                                            rx_desc, (unsigned char *)hdr);
1355                 break;
1356         case ISCSI_OP_SCSI_DATA_OUT:
1357                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1358                                                 (unsigned char *)hdr);
1359                 break;
1360         case ISCSI_OP_SCSI_TMFUNC:
1361                 cmd = isert_allocate_cmd(conn);
1362                 if (!cmd)
1363                         break;
1364
1365                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1366                                                 (unsigned char *)hdr);
1367                 break;
1368         case ISCSI_OP_LOGOUT:
1369                 cmd = isert_allocate_cmd(conn);
1370                 if (!cmd)
1371                         break;
1372
1373                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1374                 if (ret > 0)
1375                         wait_for_completion_timeout(&conn->conn_logout_comp,
1376                                                     SECONDS_FOR_LOGOUT_COMP *
1377                                                     HZ);
1378                 break;
1379         case ISCSI_OP_TEXT:
1380                 cmd = isert_allocate_cmd(conn);
1381                 if (!cmd)
1382                         break;
1383
1384                 isert_cmd = iscsit_priv_cmd(cmd);
1385                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1386                                             rx_desc, (struct iscsi_text *)hdr);
1387                 break;
1388         default:
1389                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1390                 dump_stack();
1391                 break;
1392         }
1393
1394         return ret;
1395 }
1396
1397 static void
1398 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1399 {
1400         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1401         uint64_t read_va = 0, write_va = 0;
1402         uint32_t read_stag = 0, write_stag = 0;
1403         int rc;
1404
1405         switch (iser_hdr->flags & 0xF0) {
1406         case ISCSI_CTRL:
1407                 if (iser_hdr->flags & ISER_RSV) {
1408                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1409                         read_va = be64_to_cpu(iser_hdr->read_va);
1410                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1411                                  read_stag, (unsigned long long)read_va);
1412                 }
1413                 if (iser_hdr->flags & ISER_WSV) {
1414                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1415                         write_va = be64_to_cpu(iser_hdr->write_va);
1416                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1417                                  write_stag, (unsigned long long)write_va);
1418                 }
1419
1420                 pr_debug("ISER ISCSI_CTRL PDU\n");
1421                 break;
1422         case ISER_HELLO:
1423                 pr_err("iSER Hello message\n");
1424                 break;
1425         default:
1426                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1427                 break;
1428         }
1429
1430         rc = isert_rx_opcode(isert_conn, rx_desc,
1431                              read_stag, read_va, write_stag, write_va);
1432 }
1433
1434 static void
1435 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1436                     unsigned long xfer_len)
1437 {
1438         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1439         struct iscsi_hdr *hdr;
1440         u64 rx_dma;
1441         int rx_buflen, outstanding;
1442
1443         if ((char *)desc == isert_conn->login_req_buf) {
1444                 rx_dma = isert_conn->login_req_dma;
1445                 rx_buflen = ISER_RX_LOGIN_SIZE;
1446                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1447                          rx_dma, rx_buflen);
1448         } else {
1449                 rx_dma = desc->dma_addr;
1450                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1451                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1452                          rx_dma, rx_buflen);
1453         }
1454
1455         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1456
1457         hdr = &desc->iscsi_header;
1458         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1459                  hdr->opcode, hdr->itt, hdr->flags,
1460                  (int)(xfer_len - ISER_HEADERS_LEN));
1461
1462         if ((char *)desc == isert_conn->login_req_buf)
1463                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1464                                    isert_conn);
1465         else
1466                 isert_rx_do_work(desc, isert_conn);
1467
1468         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1469                                       DMA_FROM_DEVICE);
1470
1471         isert_conn->post_recv_buf_count--;
1472         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1473                  isert_conn->post_recv_buf_count);
1474
1475         if ((char *)desc == isert_conn->login_req_buf)
1476                 return;
1477
1478         outstanding = isert_conn->post_recv_buf_count;
1479         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1480                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1481                                 ISERT_MIN_POSTED_RX);
1482                 err = isert_post_recv(isert_conn, count);
1483                 if (err) {
1484                         pr_err("isert_post_recv() count: %d failed, %d\n",
1485                                count, err);
1486                 }
1487         }
1488 }
1489
1490 static int
1491 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1492                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1493                    enum iser_ib_op_code op, struct isert_data_buf *data)
1494 {
1495         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1496
1497         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1498                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1499
1500         data->len = length - offset;
1501         data->offset = offset;
1502         data->sg_off = data->offset / PAGE_SIZE;
1503
1504         data->sg = &sg[data->sg_off];
1505         data->nents = min_t(unsigned int, nents - data->sg_off,
1506                                           ISCSI_ISER_SG_TABLESIZE);
1507         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1508                                         PAGE_SIZE);
1509
1510         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1511                                         data->dma_dir);
1512         if (unlikely(!data->dma_nents)) {
1513                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1514                 return -EINVAL;
1515         }
1516
1517         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1518                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1519
1520         return 0;
1521 }
1522
1523 static void
1524 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1525 {
1526         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1527
1528         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1529         memset(data, 0, sizeof(*data));
1530 }
1531
1532
1533
1534 static void
1535 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1536 {
1537         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1538
1539         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1540
1541         if (wr->data.sg) {
1542                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1543                 isert_unmap_data_buf(isert_conn, &wr->data);
1544         }
1545
1546         if (wr->send_wr) {
1547                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1548                 kfree(wr->send_wr);
1549                 wr->send_wr = NULL;
1550         }
1551
1552         if (wr->ib_sge) {
1553                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1554                 kfree(wr->ib_sge);
1555                 wr->ib_sge = NULL;
1556         }
1557 }
1558
1559 static void
1560 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1561 {
1562         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1563         LIST_HEAD(unmap_list);
1564
1565         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1566
1567         if (wr->fr_desc) {
1568                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1569                          isert_cmd, wr->fr_desc);
1570                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1571                         isert_unmap_data_buf(isert_conn, &wr->prot);
1572                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1573                 }
1574                 spin_lock_bh(&isert_conn->conn_lock);
1575                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1576                 spin_unlock_bh(&isert_conn->conn_lock);
1577                 wr->fr_desc = NULL;
1578         }
1579
1580         if (wr->data.sg) {
1581                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1582                 isert_unmap_data_buf(isert_conn, &wr->data);
1583         }
1584
1585         wr->ib_sge = NULL;
1586         wr->send_wr = NULL;
1587 }
1588
1589 static void
1590 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1591 {
1592         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1593         struct isert_conn *isert_conn = isert_cmd->conn;
1594         struct iscsi_conn *conn = isert_conn->conn;
1595         struct isert_device *device = isert_conn->conn_device;
1596
1597         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1598
1599         switch (cmd->iscsi_opcode) {
1600         case ISCSI_OP_SCSI_CMD:
1601                 spin_lock_bh(&conn->cmd_lock);
1602                 if (!list_empty(&cmd->i_conn_node))
1603                         list_del_init(&cmd->i_conn_node);
1604                 spin_unlock_bh(&conn->cmd_lock);
1605
1606                 if (cmd->data_direction == DMA_TO_DEVICE) {
1607                         iscsit_stop_dataout_timer(cmd);
1608                         /*
1609                          * Check for special case during comp_err where
1610                          * WRITE_PENDING has been handed off from core,
1611                          * but requires an extra target_put_sess_cmd()
1612                          * before transport_generic_free_cmd() below.
1613                          */
1614                         if (comp_err &&
1615                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1616                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1617
1618                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1619                         }
1620                 }
1621
1622                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1623                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1624                 break;
1625         case ISCSI_OP_SCSI_TMFUNC:
1626                 spin_lock_bh(&conn->cmd_lock);
1627                 if (!list_empty(&cmd->i_conn_node))
1628                         list_del_init(&cmd->i_conn_node);
1629                 spin_unlock_bh(&conn->cmd_lock);
1630
1631                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1632                 break;
1633         case ISCSI_OP_REJECT:
1634         case ISCSI_OP_NOOP_OUT:
1635         case ISCSI_OP_TEXT:
1636                 spin_lock_bh(&conn->cmd_lock);
1637                 if (!list_empty(&cmd->i_conn_node))
1638                         list_del_init(&cmd->i_conn_node);
1639                 spin_unlock_bh(&conn->cmd_lock);
1640
1641                 /*
1642                  * Handle special case for REJECT when iscsi_add_reject*() has
1643                  * overwritten the original iscsi_opcode assignment, and the
1644                  * associated cmd->se_cmd needs to be released.
1645                  */
1646                 if (cmd->se_cmd.se_tfo != NULL) {
1647                         pr_debug("Calling transport_generic_free_cmd from"
1648                                  " isert_put_cmd for 0x%02x\n",
1649                                  cmd->iscsi_opcode);
1650                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1651                         break;
1652                 }
1653                 /*
1654                  * Fall-through
1655                  */
1656         default:
1657                 iscsit_release_cmd(cmd);
1658                 break;
1659         }
1660 }
1661
1662 static void
1663 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1664 {
1665         if (tx_desc->dma_addr != 0) {
1666                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1667                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1668                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1669                 tx_desc->dma_addr = 0;
1670         }
1671 }
1672
1673 static void
1674 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1675                      struct ib_device *ib_dev, bool comp_err)
1676 {
1677         if (isert_cmd->pdu_buf_dma != 0) {
1678                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1679                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1680                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1681                 isert_cmd->pdu_buf_dma = 0;
1682         }
1683
1684         isert_unmap_tx_desc(tx_desc, ib_dev);
1685         isert_put_cmd(isert_cmd, comp_err);
1686 }
1687
1688 static int
1689 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1690 {
1691         struct ib_mr_status mr_status;
1692         int ret;
1693
1694         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1695         if (ret) {
1696                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1697                 goto fail_mr_status;
1698         }
1699
1700         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1701                 u64 sec_offset_err;
1702                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1703
1704                 switch (mr_status.sig_err.err_type) {
1705                 case IB_SIG_BAD_GUARD:
1706                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1707                         break;
1708                 case IB_SIG_BAD_REFTAG:
1709                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1710                         break;
1711                 case IB_SIG_BAD_APPTAG:
1712                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1713                         break;
1714                 }
1715                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1716                 do_div(sec_offset_err, block_size);
1717                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1718
1719                 pr_err("isert: PI error found type %d at sector 0x%llx "
1720                        "expected 0x%x vs actual 0x%x\n",
1721                        mr_status.sig_err.err_type,
1722                        (unsigned long long)se_cmd->bad_sector,
1723                        mr_status.sig_err.expected,
1724                        mr_status.sig_err.actual);
1725                 ret = 1;
1726         }
1727
1728 fail_mr_status:
1729         return ret;
1730 }
1731
1732 static void
1733 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1734                             struct isert_cmd *isert_cmd)
1735 {
1736         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1737         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1738         struct se_cmd *se_cmd = &cmd->se_cmd;
1739         struct isert_conn *isert_conn = isert_cmd->conn;
1740         struct isert_device *device = isert_conn->conn_device;
1741         int ret = 0;
1742
1743         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1744                 ret = isert_check_pi_status(se_cmd,
1745                                             wr->fr_desc->pi_ctx->sig_mr);
1746                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1747         }
1748
1749         device->unreg_rdma_mem(isert_cmd, isert_conn);
1750         wr->send_wr_num = 0;
1751         if (ret)
1752                 transport_send_check_condition_and_sense(se_cmd,
1753                                                          se_cmd->pi_err, 0);
1754         else
1755                 isert_put_response(isert_conn->conn, cmd);
1756 }
1757
1758 static void
1759 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1760                            struct isert_cmd *isert_cmd)
1761 {
1762         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1763         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1764         struct se_cmd *se_cmd = &cmd->se_cmd;
1765         struct isert_conn *isert_conn = isert_cmd->conn;
1766         struct isert_device *device = isert_conn->conn_device;
1767         int ret = 0;
1768
1769         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1770                 ret = isert_check_pi_status(se_cmd,
1771                                             wr->fr_desc->pi_ctx->sig_mr);
1772                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1773         }
1774
1775         iscsit_stop_dataout_timer(cmd);
1776         device->unreg_rdma_mem(isert_cmd, isert_conn);
1777         cmd->write_data_done = wr->data.len;
1778         wr->send_wr_num = 0;
1779
1780         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1781         spin_lock_bh(&cmd->istate_lock);
1782         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1783         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1784         spin_unlock_bh(&cmd->istate_lock);
1785
1786         if (ret)
1787                 transport_send_check_condition_and_sense(se_cmd,
1788                                                          se_cmd->pi_err, 0);
1789         else
1790                 target_execute_cmd(se_cmd);
1791 }
1792
1793 static void
1794 isert_do_control_comp(struct work_struct *work)
1795 {
1796         struct isert_cmd *isert_cmd = container_of(work,
1797                         struct isert_cmd, comp_work);
1798         struct isert_conn *isert_conn = isert_cmd->conn;
1799         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1800         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1801
1802         switch (cmd->i_state) {
1803         case ISTATE_SEND_TASKMGTRSP:
1804                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1805
1806                 atomic_dec(&isert_conn->post_send_buf_count);
1807                 iscsit_tmr_post_handler(cmd, cmd->conn);
1808
1809                 cmd->i_state = ISTATE_SENT_STATUS;
1810                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1811                 break;
1812         case ISTATE_SEND_REJECT:
1813                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1814                 atomic_dec(&isert_conn->post_send_buf_count);
1815
1816                 cmd->i_state = ISTATE_SENT_STATUS;
1817                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1818                 break;
1819         case ISTATE_SEND_LOGOUTRSP:
1820                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1821
1822                 atomic_dec(&isert_conn->post_send_buf_count);
1823                 iscsit_logout_post_handler(cmd, cmd->conn);
1824                 break;
1825         case ISTATE_SEND_TEXTRSP:
1826                 atomic_dec(&isert_conn->post_send_buf_count);
1827                 cmd->i_state = ISTATE_SENT_STATUS;
1828                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1829                 break;
1830         default:
1831                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1832                 dump_stack();
1833                 break;
1834         }
1835 }
1836
1837 static void
1838 isert_response_completion(struct iser_tx_desc *tx_desc,
1839                           struct isert_cmd *isert_cmd,
1840                           struct isert_conn *isert_conn,
1841                           struct ib_device *ib_dev)
1842 {
1843         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1844         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1845
1846         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1847             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1848             cmd->i_state == ISTATE_SEND_REJECT ||
1849             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1850                 isert_unmap_tx_desc(tx_desc, ib_dev);
1851
1852                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1853                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1854                 return;
1855         }
1856
1857         /**
1858          * If send_wr_num is 0 this means that we got
1859          * RDMA completion and we cleared it and we should
1860          * simply decrement the response post. else the
1861          * response is incorporated in send_wr_num, just
1862          * sub it.
1863          **/
1864         if (wr->send_wr_num)
1865                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1866         else
1867                 atomic_dec(&isert_conn->post_send_buf_count);
1868
1869         cmd->i_state = ISTATE_SENT_STATUS;
1870         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1871 }
1872
1873 static void
1874 __isert_send_completion(struct iser_tx_desc *tx_desc,
1875                         struct isert_conn *isert_conn)
1876 {
1877         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1878         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1879         struct isert_rdma_wr *wr;
1880
1881         if (!isert_cmd) {
1882                 atomic_dec(&isert_conn->post_send_buf_count);
1883                 isert_unmap_tx_desc(tx_desc, ib_dev);
1884                 return;
1885         }
1886         wr = &isert_cmd->rdma_wr;
1887
1888         switch (wr->iser_ib_op) {
1889         case ISER_IB_RECV:
1890                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1891                 dump_stack();
1892                 break;
1893         case ISER_IB_SEND:
1894                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1895                 isert_response_completion(tx_desc, isert_cmd,
1896                                           isert_conn, ib_dev);
1897                 break;
1898         case ISER_IB_RDMA_WRITE:
1899                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1900                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1901                 isert_completion_rdma_write(tx_desc, isert_cmd);
1902                 break;
1903         case ISER_IB_RDMA_READ:
1904                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1905
1906                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1907                 isert_completion_rdma_read(tx_desc, isert_cmd);
1908                 break;
1909         default:
1910                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1911                 dump_stack();
1912                 break;
1913         }
1914 }
1915
1916 static void
1917 isert_send_completion(struct iser_tx_desc *tx_desc,
1918                       struct isert_conn *isert_conn)
1919 {
1920         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1921         struct iser_tx_desc *t;
1922         /*
1923          * Drain coalesced completion llist starting from comp_llnode_batch
1924          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1925          */
1926         while (llnode) {
1927                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1928                 llnode = llist_next(llnode);
1929                 __isert_send_completion(t, isert_conn);
1930         }
1931         __isert_send_completion(tx_desc, isert_conn);
1932 }
1933
1934 static void
1935 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1936 {
1937         struct llist_node *llnode;
1938         struct isert_rdma_wr *wr;
1939         struct iser_tx_desc *t;
1940
1941         mutex_lock(&isert_conn->conn_mutex);
1942         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1943         isert_conn->conn_comp_batch = 0;
1944         mutex_unlock(&isert_conn->conn_mutex);
1945
1946         while (llnode) {
1947                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1948                 llnode = llist_next(llnode);
1949                 wr = &t->isert_cmd->rdma_wr;
1950
1951                 /**
1952                  * If send_wr_num is 0 this means that we got
1953                  * RDMA completion and we cleared it and we should
1954                  * simply decrement the response post. else the
1955                  * response is incorporated in send_wr_num, just
1956                  * sub it.
1957                  **/
1958                 if (wr->send_wr_num)
1959                         atomic_sub(wr->send_wr_num,
1960                                    &isert_conn->post_send_buf_count);
1961                 else
1962                         atomic_dec(&isert_conn->post_send_buf_count);
1963
1964                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1965         }
1966 }
1967
1968 static void
1969 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1970 {
1971         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1972         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1973         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1974         struct isert_rdma_wr *wr;
1975         struct iser_tx_desc *t;
1976
1977         while (llnode) {
1978                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1979                 llnode = llist_next(llnode);
1980                 wr = &t->isert_cmd->rdma_wr;
1981
1982                 /**
1983                  * If send_wr_num is 0 this means that we got
1984                  * RDMA completion and we cleared it and we should
1985                  * simply decrement the response post. else the
1986                  * response is incorporated in send_wr_num, just
1987                  * sub it.
1988                  **/
1989                 if (wr->send_wr_num)
1990                         atomic_sub(wr->send_wr_num,
1991                                    &isert_conn->post_send_buf_count);
1992                 else
1993                         atomic_dec(&isert_conn->post_send_buf_count);
1994
1995                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1996         }
1997         tx_desc->comp_llnode_batch = NULL;
1998
1999         if (!isert_cmd)
2000                 isert_unmap_tx_desc(tx_desc, ib_dev);
2001         else
2002                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2003 }
2004
2005 static void
2006 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2007 {
2008         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2009         struct iscsi_conn *conn = isert_conn->conn;
2010
2011         if (isert_conn->post_recv_buf_count)
2012                 return;
2013
2014         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2015
2016         if (conn->sess) {
2017                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2018                 target_wait_for_sess_cmds(conn->sess->se_sess);
2019         }
2020
2021         while (atomic_read(&isert_conn->post_send_buf_count))
2022                 msleep(3000);
2023
2024         mutex_lock(&isert_conn->conn_mutex);
2025         isert_conn->state = ISER_CONN_DOWN;
2026         mutex_unlock(&isert_conn->conn_mutex);
2027
2028         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2029
2030         complete(&isert_conn->conn_wait_comp_err);
2031 }
2032
2033 static void
2034 isert_cq_tx_work(struct work_struct *work)
2035 {
2036         struct isert_cq_desc *cq_desc = container_of(work,
2037                                 struct isert_cq_desc, cq_tx_work);
2038         struct isert_device *device = cq_desc->device;
2039         int cq_index = cq_desc->cq_index;
2040         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2041         struct isert_conn *isert_conn;
2042         struct iser_tx_desc *tx_desc;
2043         struct ib_wc wc;
2044
2045         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2046                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2047                 isert_conn = wc.qp->qp_context;
2048
2049                 if (wc.status == IB_WC_SUCCESS) {
2050                         isert_send_completion(tx_desc, isert_conn);
2051                 } else {
2052                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2053                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2054                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2055
2056                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2057                                 if (tx_desc->llnode_active)
2058                                         continue;
2059
2060                                 atomic_dec(&isert_conn->post_send_buf_count);
2061                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2062                         }
2063                 }
2064         }
2065
2066         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2067 }
2068
2069 static void
2070 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2071 {
2072         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2073
2074         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2075 }
2076
2077 static void
2078 isert_cq_rx_work(struct work_struct *work)
2079 {
2080         struct isert_cq_desc *cq_desc = container_of(work,
2081                         struct isert_cq_desc, cq_rx_work);
2082         struct isert_device *device = cq_desc->device;
2083         int cq_index = cq_desc->cq_index;
2084         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2085         struct isert_conn *isert_conn;
2086         struct iser_rx_desc *rx_desc;
2087         struct ib_wc wc;
2088         unsigned long xfer_len;
2089
2090         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2091                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2092                 isert_conn = wc.qp->qp_context;
2093
2094                 if (wc.status == IB_WC_SUCCESS) {
2095                         xfer_len = (unsigned long)wc.byte_len;
2096                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2097                 } else {
2098                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2099                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2100                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2101                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2102                                          wc.vendor_err);
2103                         }
2104                         isert_conn->post_recv_buf_count--;
2105                         isert_cq_rx_comp_err(isert_conn);
2106                 }
2107         }
2108
2109         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2110 }
2111
2112 static void
2113 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2114 {
2115         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2116
2117         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2118 }
2119
2120 static int
2121 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2122 {
2123         struct ib_send_wr *wr_failed;
2124         int ret;
2125
2126         atomic_inc(&isert_conn->post_send_buf_count);
2127
2128         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2129                            &wr_failed);
2130         if (ret) {
2131                 pr_err("ib_post_send failed with %d\n", ret);
2132                 atomic_dec(&isert_conn->post_send_buf_count);
2133                 return ret;
2134         }
2135         return ret;
2136 }
2137
2138 static int
2139 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2140 {
2141         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2142         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2143         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2144         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2145                                 &isert_cmd->tx_desc.iscsi_header;
2146
2147         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2148         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2149         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2150         /*
2151          * Attach SENSE DATA payload to iSCSI Response PDU
2152          */
2153         if (cmd->se_cmd.sense_buffer &&
2154             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2155             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2156                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2157                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2158                 u32 padding, pdu_len;
2159
2160                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2161                                    cmd->sense_buffer);
2162                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2163
2164                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2165                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2166                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2167
2168                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2169                                 (void *)cmd->sense_buffer, pdu_len,
2170                                 DMA_TO_DEVICE);
2171
2172                 isert_cmd->pdu_buf_len = pdu_len;
2173                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2174                 tx_dsg->length  = pdu_len;
2175                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2176                 isert_cmd->tx_desc.num_sge = 2;
2177         }
2178
2179         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2180
2181         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2182
2183         return isert_post_response(isert_conn, isert_cmd);
2184 }
2185
2186 static void
2187 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2188 {
2189         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2190         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2191         struct isert_device *device = isert_conn->conn_device;
2192
2193         spin_lock_bh(&conn->cmd_lock);
2194         if (!list_empty(&cmd->i_conn_node))
2195                 list_del_init(&cmd->i_conn_node);
2196         spin_unlock_bh(&conn->cmd_lock);
2197
2198         if (cmd->data_direction == DMA_TO_DEVICE)
2199                 iscsit_stop_dataout_timer(cmd);
2200
2201         device->unreg_rdma_mem(isert_cmd, isert_conn);
2202 }
2203
2204 static enum target_prot_op
2205 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2206 {
2207         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2208         struct isert_device *device = isert_conn->conn_device;
2209
2210         if (device->pi_capable)
2211                 return TARGET_PROT_ALL;
2212
2213         return TARGET_PROT_NORMAL;
2214 }
2215
2216 static int
2217 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2218                 bool nopout_response)
2219 {
2220         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2221         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2222         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2223
2224         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2225         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2226                                &isert_cmd->tx_desc.iscsi_header,
2227                                nopout_response);
2228         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2229         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2230
2231         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2232
2233         return isert_post_response(isert_conn, isert_cmd);
2234 }
2235
2236 static int
2237 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2238 {
2239         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2240         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2241         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2242
2243         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2244         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2245                                 &isert_cmd->tx_desc.iscsi_header);
2246         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2247         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2248
2249         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2250
2251         return isert_post_response(isert_conn, isert_cmd);
2252 }
2253
2254 static int
2255 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2256 {
2257         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2258         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2259         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2260
2261         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2262         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2263                                   &isert_cmd->tx_desc.iscsi_header);
2264         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2265         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2266
2267         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2268
2269         return isert_post_response(isert_conn, isert_cmd);
2270 }
2271
2272 static int
2273 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2274 {
2275         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2276         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2277         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2278         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2279         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2280         struct iscsi_reject *hdr =
2281                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2282
2283         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2284         iscsit_build_reject(cmd, conn, hdr);
2285         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2286
2287         hton24(hdr->dlength, ISCSI_HDR_LEN);
2288         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2289                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2290                         DMA_TO_DEVICE);
2291         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2292         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2293         tx_dsg->length  = ISCSI_HDR_LEN;
2294         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2295         isert_cmd->tx_desc.num_sge = 2;
2296
2297         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2298
2299         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2300
2301         return isert_post_response(isert_conn, isert_cmd);
2302 }
2303
2304 static int
2305 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2306 {
2307         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2308         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2309         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2310         struct iscsi_text_rsp *hdr =
2311                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2312         u32 txt_rsp_len;
2313         int rc;
2314
2315         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2316         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2317         if (rc < 0)
2318                 return rc;
2319
2320         txt_rsp_len = rc;
2321         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2322
2323         if (txt_rsp_len) {
2324                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2325                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2326                 void *txt_rsp_buf = cmd->buf_ptr;
2327
2328                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2329                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2330
2331                 isert_cmd->pdu_buf_len = txt_rsp_len;
2332                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2333                 tx_dsg->length  = txt_rsp_len;
2334                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2335                 isert_cmd->tx_desc.num_sge = 2;
2336         }
2337         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2338
2339         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2340
2341         return isert_post_response(isert_conn, isert_cmd);
2342 }
2343
2344 static int
2345 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2346                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2347                     u32 data_left, u32 offset)
2348 {
2349         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2350         struct scatterlist *sg_start, *tmp_sg;
2351         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2352         u32 sg_off, page_off;
2353         int i = 0, sg_nents;
2354
2355         sg_off = offset / PAGE_SIZE;
2356         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2357         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2358         page_off = offset % PAGE_SIZE;
2359
2360         send_wr->sg_list = ib_sge;
2361         send_wr->num_sge = sg_nents;
2362         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2363         /*
2364          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2365          */
2366         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2367                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2368                          (unsigned long long)tmp_sg->dma_address,
2369                          tmp_sg->length, page_off);
2370
2371                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2372                 ib_sge->length = min_t(u32, data_left,
2373                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2374                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2375
2376                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2377                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2378                 page_off = 0;
2379                 data_left -= ib_sge->length;
2380                 ib_sge++;
2381                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2382         }
2383
2384         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2385                  send_wr->sg_list, send_wr->num_sge);
2386
2387         return sg_nents;
2388 }
2389
2390 static int
2391 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2392                struct isert_rdma_wr *wr)
2393 {
2394         struct se_cmd *se_cmd = &cmd->se_cmd;
2395         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2396         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2397         struct isert_data_buf *data = &wr->data;
2398         struct ib_send_wr *send_wr;
2399         struct ib_sge *ib_sge;
2400         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2401         int ret = 0, i, ib_sge_cnt;
2402
2403         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2404
2405         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2406         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2407                                  se_cmd->t_data_nents, se_cmd->data_length,
2408                                  offset, wr->iser_ib_op, &wr->data);
2409         if (ret)
2410                 return ret;
2411
2412         data_left = data->len;
2413         offset = data->offset;
2414
2415         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2416         if (!ib_sge) {
2417                 pr_warn("Unable to allocate ib_sge\n");
2418                 ret = -ENOMEM;
2419                 goto unmap_cmd;
2420         }
2421         wr->ib_sge = ib_sge;
2422
2423         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2424         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2425                                 GFP_KERNEL);
2426         if (!wr->send_wr) {
2427                 pr_debug("Unable to allocate wr->send_wr\n");
2428                 ret = -ENOMEM;
2429                 goto unmap_cmd;
2430         }
2431
2432         wr->isert_cmd = isert_cmd;
2433         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2434
2435         for (i = 0; i < wr->send_wr_num; i++) {
2436                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2437                 data_len = min(data_left, rdma_write_max);
2438
2439                 send_wr->send_flags = 0;
2440                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2441                         send_wr->opcode = IB_WR_RDMA_WRITE;
2442                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2443                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2444                         if (i + 1 == wr->send_wr_num)
2445                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2446                         else
2447                                 send_wr->next = &wr->send_wr[i + 1];
2448                 } else {
2449                         send_wr->opcode = IB_WR_RDMA_READ;
2450                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2451                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2452                         if (i + 1 == wr->send_wr_num)
2453                                 send_wr->send_flags = IB_SEND_SIGNALED;
2454                         else
2455                                 send_wr->next = &wr->send_wr[i + 1];
2456                 }
2457
2458                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2459                                         send_wr, data_len, offset);
2460                 ib_sge += ib_sge_cnt;
2461
2462                 offset += data_len;
2463                 va_offset += data_len;
2464                 data_left -= data_len;
2465         }
2466
2467         return 0;
2468 unmap_cmd:
2469         isert_unmap_data_buf(isert_conn, data);
2470
2471         return ret;
2472 }
2473
2474 static int
2475 isert_map_fr_pagelist(struct ib_device *ib_dev,
2476                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2477 {
2478         u64 start_addr, end_addr, page, chunk_start = 0;
2479         struct scatterlist *tmp_sg;
2480         int i = 0, new_chunk, last_ent, n_pages;
2481
2482         n_pages = 0;
2483         new_chunk = 1;
2484         last_ent = sg_nents - 1;
2485         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2486                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2487                 if (new_chunk)
2488                         chunk_start = start_addr;
2489                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2490
2491                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2492                          i, (unsigned long long)tmp_sg->dma_address,
2493                          tmp_sg->length);
2494
2495                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2496                         new_chunk = 0;
2497                         continue;
2498                 }
2499                 new_chunk = 1;
2500
2501                 page = chunk_start & PAGE_MASK;
2502                 do {
2503                         fr_pl[n_pages++] = page;
2504                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2505                                  n_pages - 1, page);
2506                         page += PAGE_SIZE;
2507                 } while (page < end_addr);
2508         }
2509
2510         return n_pages;
2511 }
2512
2513 static int
2514 isert_fast_reg_mr(struct isert_conn *isert_conn,
2515                   struct fast_reg_descriptor *fr_desc,
2516                   struct isert_data_buf *mem,
2517                   enum isert_indicator ind,
2518                   struct ib_sge *sge)
2519 {
2520         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2521         struct ib_mr *mr;
2522         struct ib_fast_reg_page_list *frpl;
2523         struct ib_send_wr fr_wr, inv_wr;
2524         struct ib_send_wr *bad_wr, *wr = NULL;
2525         int ret, pagelist_len;
2526         u32 page_off;
2527         u8 key;
2528
2529         if (mem->dma_nents == 1) {
2530                 sge->lkey = isert_conn->conn_mr->lkey;
2531                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2532                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2533                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2534                          __func__, __LINE__, sge->addr, sge->length,
2535                          sge->lkey);
2536                 return 0;
2537         }
2538
2539         if (ind == ISERT_DATA_KEY_VALID) {
2540                 /* Registering data buffer */
2541                 mr = fr_desc->data_mr;
2542                 frpl = fr_desc->data_frpl;
2543         } else {
2544                 /* Registering protection buffer */
2545                 mr = fr_desc->pi_ctx->prot_mr;
2546                 frpl = fr_desc->pi_ctx->prot_frpl;
2547         }
2548
2549         page_off = mem->offset % PAGE_SIZE;
2550
2551         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2552                  fr_desc, mem->nents, mem->offset);
2553
2554         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2555                                              &frpl->page_list[0]);
2556
2557         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2558                 memset(&inv_wr, 0, sizeof(inv_wr));
2559                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2560                 inv_wr.opcode = IB_WR_LOCAL_INV;
2561                 inv_wr.ex.invalidate_rkey = mr->rkey;
2562                 wr = &inv_wr;
2563                 /* Bump the key */
2564                 key = (u8)(mr->rkey & 0x000000FF);
2565                 ib_update_fast_reg_key(mr, ++key);
2566         }
2567
2568         /* Prepare FASTREG WR */
2569         memset(&fr_wr, 0, sizeof(fr_wr));
2570         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2571         fr_wr.opcode = IB_WR_FAST_REG_MR;
2572         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2573         fr_wr.wr.fast_reg.page_list = frpl;
2574         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2575         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2576         fr_wr.wr.fast_reg.length = mem->len;
2577         fr_wr.wr.fast_reg.rkey = mr->rkey;
2578         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2579
2580         if (!wr)
2581                 wr = &fr_wr;
2582         else
2583                 wr->next = &fr_wr;
2584
2585         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2586         if (ret) {
2587                 pr_err("fast registration failed, ret:%d\n", ret);
2588                 return ret;
2589         }
2590         fr_desc->ind &= ~ind;
2591
2592         sge->lkey = mr->lkey;
2593         sge->addr = frpl->page_list[0] + page_off;
2594         sge->length = mem->len;
2595
2596         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2597                  __func__, __LINE__, sge->addr, sge->length,
2598                  sge->lkey);
2599
2600         return ret;
2601 }
2602
2603 static inline enum ib_t10_dif_type
2604 se2ib_prot_type(enum target_prot_type prot_type)
2605 {
2606         switch (prot_type) {
2607         case TARGET_DIF_TYPE0_PROT:
2608                 return IB_T10DIF_NONE;
2609         case TARGET_DIF_TYPE1_PROT:
2610                 return IB_T10DIF_TYPE1;
2611         case TARGET_DIF_TYPE2_PROT:
2612                 return IB_T10DIF_TYPE2;
2613         case TARGET_DIF_TYPE3_PROT:
2614                 return IB_T10DIF_TYPE3;
2615         default:
2616                 return IB_T10DIF_NONE;
2617         }
2618 }
2619
2620 static int
2621 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2622 {
2623         enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2624
2625         sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2626         sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2627         sig_attrs->mem.sig.dif.pi_interval =
2628                                 se_cmd->se_dev->dev_attrib.block_size;
2629         sig_attrs->wire.sig.dif.pi_interval =
2630                                 se_cmd->se_dev->dev_attrib.block_size;
2631
2632         switch (se_cmd->prot_op) {
2633         case TARGET_PROT_DIN_INSERT:
2634         case TARGET_PROT_DOUT_STRIP:
2635                 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2636                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2637                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2638                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2639                 break;
2640         case TARGET_PROT_DOUT_INSERT:
2641         case TARGET_PROT_DIN_STRIP:
2642                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2643                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2644                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2645                 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2646                 break;
2647         case TARGET_PROT_DIN_PASS:
2648         case TARGET_PROT_DOUT_PASS:
2649                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2650                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2651                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2652                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2653                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2654                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2655                 break;
2656         default:
2657                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2658                 return -EINVAL;
2659         }
2660
2661         return 0;
2662 }
2663
2664 static inline u8
2665 isert_set_prot_checks(u8 prot_checks)
2666 {
2667         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2668                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2669                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2670 }
2671
2672 static int
2673 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2674                  struct fast_reg_descriptor *fr_desc,
2675                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2676                  struct ib_sge *sig_sge)
2677 {
2678         struct ib_send_wr sig_wr, inv_wr;
2679         struct ib_send_wr *bad_wr, *wr = NULL;
2680         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2681         struct ib_sig_attrs sig_attrs;
2682         int ret;
2683         u32 key;
2684
2685         memset(&sig_attrs, 0, sizeof(sig_attrs));
2686         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2687         if (ret)
2688                 goto err;
2689
2690         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2691
2692         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2693                 memset(&inv_wr, 0, sizeof(inv_wr));
2694                 inv_wr.opcode = IB_WR_LOCAL_INV;
2695                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2696                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2697                 wr = &inv_wr;
2698                 /* Bump the key */
2699                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2700                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2701         }
2702
2703         memset(&sig_wr, 0, sizeof(sig_wr));
2704         sig_wr.opcode = IB_WR_REG_SIG_MR;
2705         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2706         sig_wr.sg_list = data_sge;
2707         sig_wr.num_sge = 1;
2708         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2709         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2710         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2711         if (se_cmd->t_prot_sg)
2712                 sig_wr.wr.sig_handover.prot = prot_sge;
2713
2714         if (!wr)
2715                 wr = &sig_wr;
2716         else
2717                 wr->next = &sig_wr;
2718
2719         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2720         if (ret) {
2721                 pr_err("fast registration failed, ret:%d\n", ret);
2722                 goto err;
2723         }
2724         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2725
2726         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2727         sig_sge->addr = 0;
2728         sig_sge->length = se_cmd->data_length;
2729         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2730             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2731                 /*
2732                  * We have protection guards on the wire
2733                  * so we need to set a larget transfer
2734                  */
2735                 sig_sge->length += se_cmd->prot_length;
2736
2737         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2738                  sig_sge->addr, sig_sge->length,
2739                  sig_sge->lkey);
2740 err:
2741         return ret;
2742 }
2743
2744 static int
2745 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2746                struct isert_rdma_wr *wr)
2747 {
2748         struct se_cmd *se_cmd = &cmd->se_cmd;
2749         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2750         struct isert_conn *isert_conn = conn->context;
2751         struct ib_sge data_sge;
2752         struct ib_send_wr *send_wr;
2753         struct fast_reg_descriptor *fr_desc = NULL;
2754         u32 offset;
2755         int ret = 0;
2756         unsigned long flags;
2757
2758         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2759
2760         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2761         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2762                                  se_cmd->t_data_nents, se_cmd->data_length,
2763                                  offset, wr->iser_ib_op, &wr->data);
2764         if (ret)
2765                 return ret;
2766
2767         if (wr->data.dma_nents != 1 ||
2768             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2769                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2770                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2771                                            struct fast_reg_descriptor, list);
2772                 list_del(&fr_desc->list);
2773                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2774                 wr->fr_desc = fr_desc;
2775         }
2776
2777         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2778                                 ISERT_DATA_KEY_VALID, &data_sge);
2779         if (ret)
2780                 goto unmap_cmd;
2781
2782         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2783                 struct ib_sge prot_sge, sig_sge;
2784
2785                 if (se_cmd->t_prot_sg) {
2786                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2787                                                  se_cmd->t_prot_sg,
2788                                                  se_cmd->t_prot_nents,
2789                                                  se_cmd->prot_length,
2790                                                  0, wr->iser_ib_op, &wr->prot);
2791                         if (ret)
2792                                 goto unmap_cmd;
2793
2794                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2795                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2796                         if (ret)
2797                                 goto unmap_prot_cmd;
2798                 }
2799
2800                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2801                                        &data_sge, &prot_sge, &sig_sge);
2802                 if (ret)
2803                         goto unmap_prot_cmd;
2804
2805                 fr_desc->ind |= ISERT_PROTECTED;
2806                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2807         } else
2808                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2809
2810         wr->ib_sge = &wr->s_ib_sge;
2811         wr->send_wr_num = 1;
2812         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2813         wr->send_wr = &wr->s_send_wr;
2814         wr->isert_cmd = isert_cmd;
2815
2816         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2817         send_wr->sg_list = &wr->s_ib_sge;
2818         send_wr->num_sge = 1;
2819         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2820         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2821                 send_wr->opcode = IB_WR_RDMA_WRITE;
2822                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2823                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2824                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2825                                       0 : IB_SEND_SIGNALED;
2826         } else {
2827                 send_wr->opcode = IB_WR_RDMA_READ;
2828                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2829                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2830                 send_wr->send_flags = IB_SEND_SIGNALED;
2831         }
2832
2833         return 0;
2834 unmap_prot_cmd:
2835         if (se_cmd->t_prot_sg)
2836                 isert_unmap_data_buf(isert_conn, &wr->prot);
2837 unmap_cmd:
2838         if (fr_desc) {
2839                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2840                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2841                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2842         }
2843         isert_unmap_data_buf(isert_conn, &wr->data);
2844
2845         return ret;
2846 }
2847
2848 static int
2849 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2850 {
2851         struct se_cmd *se_cmd = &cmd->se_cmd;
2852         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2853         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2854         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2855         struct isert_device *device = isert_conn->conn_device;
2856         struct ib_send_wr *wr_failed;
2857         int rc;
2858
2859         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2860                  isert_cmd, se_cmd->data_length);
2861         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2862         rc = device->reg_rdma_mem(conn, cmd, wr);
2863         if (rc) {
2864                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2865                 return rc;
2866         }
2867
2868         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2869                 /*
2870                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2871                  */
2872                 isert_create_send_desc(isert_conn, isert_cmd,
2873                                        &isert_cmd->tx_desc);
2874                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2875                                      &isert_cmd->tx_desc.iscsi_header);
2876                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2877                 isert_init_send_wr(isert_conn, isert_cmd,
2878                                    &isert_cmd->tx_desc.send_wr, true);
2879                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2880                 wr->send_wr_num += 1;
2881         }
2882
2883         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2884
2885         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2886         if (rc) {
2887                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2888                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2889         }
2890
2891         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2892                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2893                          "READ\n", isert_cmd);
2894         else
2895                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2896                          isert_cmd);
2897
2898         return 1;
2899 }
2900
2901 static int
2902 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2903 {
2904         struct se_cmd *se_cmd = &cmd->se_cmd;
2905         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2906         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2907         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2908         struct isert_device *device = isert_conn->conn_device;
2909         struct ib_send_wr *wr_failed;
2910         int rc;
2911
2912         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2913                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2914         wr->iser_ib_op = ISER_IB_RDMA_READ;
2915         rc = device->reg_rdma_mem(conn, cmd, wr);
2916         if (rc) {
2917                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2918                 return rc;
2919         }
2920
2921         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2922
2923         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2924         if (rc) {
2925                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2926                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2927         }
2928         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2929                  isert_cmd);
2930
2931         return 0;
2932 }
2933
2934 static int
2935 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2936 {
2937         int ret;
2938
2939         switch (state) {
2940         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2941                 ret = isert_put_nopin(cmd, conn, false);
2942                 break;
2943         default:
2944                 pr_err("Unknown immediate state: 0x%02x\n", state);
2945                 ret = -EINVAL;
2946                 break;
2947         }
2948
2949         return ret;
2950 }
2951
2952 static int
2953 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2954 {
2955         int ret;
2956
2957         switch (state) {
2958         case ISTATE_SEND_LOGOUTRSP:
2959                 ret = isert_put_logout_rsp(cmd, conn);
2960                 if (!ret) {
2961                         pr_debug("Returning iSER Logout -EAGAIN\n");
2962                         ret = -EAGAIN;
2963                 }
2964                 break;
2965         case ISTATE_SEND_NOPIN:
2966                 ret = isert_put_nopin(cmd, conn, true);
2967                 break;
2968         case ISTATE_SEND_TASKMGTRSP:
2969                 ret = isert_put_tm_rsp(cmd, conn);
2970                 break;
2971         case ISTATE_SEND_REJECT:
2972                 ret = isert_put_reject(cmd, conn);
2973                 break;
2974         case ISTATE_SEND_TEXTRSP:
2975                 ret = isert_put_text_rsp(cmd, conn);
2976                 break;
2977         case ISTATE_SEND_STATUS:
2978                 /*
2979                  * Special case for sending non GOOD SCSI status from TX thread
2980                  * context during pre se_cmd excecution failure.
2981                  */
2982                 ret = isert_put_response(conn, cmd);
2983                 break;
2984         default:
2985                 pr_err("Unknown response state: 0x%02x\n", state);
2986                 ret = -EINVAL;
2987                 break;
2988         }
2989
2990         return ret;
2991 }
2992
2993 static int
2994 isert_setup_np(struct iscsi_np *np,
2995                struct __kernel_sockaddr_storage *ksockaddr)
2996 {
2997         struct isert_np *isert_np;
2998         struct rdma_cm_id *isert_lid;
2999         struct sockaddr *sa;
3000         int ret;
3001
3002         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3003         if (!isert_np) {
3004                 pr_err("Unable to allocate struct isert_np\n");
3005                 return -ENOMEM;
3006         }
3007         sema_init(&isert_np->np_sem, 0);
3008         mutex_init(&isert_np->np_accept_mutex);
3009         INIT_LIST_HEAD(&isert_np->np_accept_list);
3010         init_completion(&isert_np->np_login_comp);
3011
3012         sa = (struct sockaddr *)ksockaddr;
3013         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3014         /*
3015          * Setup the np->np_sockaddr from the passed sockaddr setup
3016          * in iscsi_target_configfs.c code..
3017          */
3018         memcpy(&np->np_sockaddr, ksockaddr,
3019                sizeof(struct __kernel_sockaddr_storage));
3020
3021         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3022                                 IB_QPT_RC);
3023         if (IS_ERR(isert_lid)) {
3024                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3025                        PTR_ERR(isert_lid));
3026                 ret = PTR_ERR(isert_lid);
3027                 goto out;
3028         }
3029
3030         ret = rdma_bind_addr(isert_lid, sa);
3031         if (ret) {
3032                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3033                 goto out_lid;
3034         }
3035
3036         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3037         if (ret) {
3038                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3039                 goto out_lid;
3040         }
3041
3042         isert_np->np_cm_id = isert_lid;
3043         np->np_context = isert_np;
3044         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3045
3046         return 0;
3047
3048 out_lid:
3049         rdma_destroy_id(isert_lid);
3050 out:
3051         kfree(isert_np);
3052         return ret;
3053 }
3054
3055 static int
3056 isert_rdma_accept(struct isert_conn *isert_conn)
3057 {
3058         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3059         struct rdma_conn_param cp;
3060         int ret;
3061
3062         memset(&cp, 0, sizeof(struct rdma_conn_param));
3063         cp.responder_resources = isert_conn->responder_resources;
3064         cp.initiator_depth = isert_conn->initiator_depth;
3065         cp.retry_count = 7;
3066         cp.rnr_retry_count = 7;
3067
3068         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3069
3070         ret = rdma_accept(cm_id, &cp);
3071         if (ret) {
3072                 pr_err("rdma_accept() failed with: %d\n", ret);
3073                 return ret;
3074         }
3075
3076         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3077
3078         return 0;
3079 }
3080
3081 static int
3082 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3083 {
3084         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3085         int ret;
3086
3087         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3088         /*
3089          * For login requests after the first PDU, isert_rx_login_req() will
3090          * kick schedule_delayed_work(&conn->login_work) as the packet is
3091          * received, which turns this callback from iscsi_target_do_login_rx()
3092          * into a NOP.
3093          */
3094         if (!login->first_request)
3095                 return 0;
3096
3097         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3098         if (ret)
3099                 return ret;
3100
3101         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3102         return 0;
3103 }
3104
3105 static void
3106 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3107                     struct isert_conn *isert_conn)
3108 {
3109         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3110         struct rdma_route *cm_route = &cm_id->route;
3111         struct sockaddr_in *sock_in;
3112         struct sockaddr_in6 *sock_in6;
3113
3114         conn->login_family = np->np_sockaddr.ss_family;
3115
3116         if (np->np_sockaddr.ss_family == AF_INET6) {
3117                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3118                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3119                          &sock_in6->sin6_addr.in6_u);
3120                 conn->login_port = ntohs(sock_in6->sin6_port);
3121
3122                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3123                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3124                          &sock_in6->sin6_addr.in6_u);
3125                 conn->local_port = ntohs(sock_in6->sin6_port);
3126         } else {
3127                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3128                 sprintf(conn->login_ip, "%pI4",
3129                         &sock_in->sin_addr.s_addr);
3130                 conn->login_port = ntohs(sock_in->sin_port);
3131
3132                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3133                 sprintf(conn->local_ip, "%pI4",
3134                         &sock_in->sin_addr.s_addr);
3135                 conn->local_port = ntohs(sock_in->sin_port);
3136         }
3137 }
3138
3139 static int
3140 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3141 {
3142         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3143         struct isert_conn *isert_conn;
3144         int max_accept = 0, ret;
3145
3146 accept_wait:
3147         ret = down_interruptible(&isert_np->np_sem);
3148         if (max_accept > 5)
3149                 return -ENODEV;
3150
3151         spin_lock_bh(&np->np_thread_lock);
3152         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3153                 spin_unlock_bh(&np->np_thread_lock);
3154                 pr_debug("np_thread_state %d for isert_accept_np\n",
3155                          np->np_thread_state);
3156                 /**
3157                  * No point in stalling here when np_thread
3158                  * is in state RESET/SHUTDOWN/EXIT - bail
3159                  **/
3160                 return -ENODEV;
3161         }
3162         spin_unlock_bh(&np->np_thread_lock);
3163
3164         mutex_lock(&isert_np->np_accept_mutex);
3165         if (list_empty(&isert_np->np_accept_list)) {
3166                 mutex_unlock(&isert_np->np_accept_mutex);
3167                 max_accept++;
3168                 goto accept_wait;
3169         }
3170         isert_conn = list_first_entry(&isert_np->np_accept_list,
3171                         struct isert_conn, conn_accept_node);
3172         list_del_init(&isert_conn->conn_accept_node);
3173         mutex_unlock(&isert_np->np_accept_mutex);
3174
3175         conn->context = isert_conn;
3176         isert_conn->conn = conn;
3177         max_accept = 0;
3178
3179         ret = isert_rdma_post_recvl(isert_conn);
3180         if (ret)
3181                 return ret;
3182
3183         ret = isert_rdma_accept(isert_conn);
3184         if (ret)
3185                 return ret;
3186
3187         isert_set_conn_info(np, conn, isert_conn);
3188
3189         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3190         return 0;
3191 }
3192
3193 static void
3194 isert_free_np(struct iscsi_np *np)
3195 {
3196         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3197
3198         rdma_destroy_id(isert_np->np_cm_id);
3199
3200         np->np_context = NULL;
3201         kfree(isert_np);
3202 }
3203
3204 static void isert_wait_conn(struct iscsi_conn *conn)
3205 {
3206         struct isert_conn *isert_conn = conn->context;
3207
3208         pr_debug("isert_wait_conn: Starting \n");
3209
3210         mutex_lock(&isert_conn->conn_mutex);
3211         if (isert_conn->conn_cm_id) {
3212                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3213                 rdma_disconnect(isert_conn->conn_cm_id);
3214         }
3215         /*
3216          * Only wait for conn_wait_comp_err if the isert_conn made it
3217          * into full feature phase..
3218          */
3219         if (isert_conn->state == ISER_CONN_INIT) {
3220                 mutex_unlock(&isert_conn->conn_mutex);
3221                 return;
3222         }
3223         if (isert_conn->state == ISER_CONN_UP)
3224                 isert_conn->state = ISER_CONN_TERMINATING;
3225         mutex_unlock(&isert_conn->conn_mutex);
3226
3227         wait_for_completion(&isert_conn->conn_wait_comp_err);
3228
3229         wait_for_completion(&isert_conn->conn_wait);
3230 }
3231
3232 static void isert_free_conn(struct iscsi_conn *conn)
3233 {
3234         struct isert_conn *isert_conn = conn->context;
3235
3236         isert_put_conn(isert_conn);
3237 }
3238
3239 static struct iscsit_transport iser_target_transport = {
3240         .name                   = "IB/iSER",
3241         .transport_type         = ISCSI_INFINIBAND,
3242         .priv_size              = sizeof(struct isert_cmd),
3243         .owner                  = THIS_MODULE,
3244         .iscsit_setup_np        = isert_setup_np,
3245         .iscsit_accept_np       = isert_accept_np,
3246         .iscsit_free_np         = isert_free_np,
3247         .iscsit_wait_conn       = isert_wait_conn,
3248         .iscsit_free_conn       = isert_free_conn,
3249         .iscsit_get_login_rx    = isert_get_login_rx,
3250         .iscsit_put_login_tx    = isert_put_login_tx,
3251         .iscsit_immediate_queue = isert_immediate_queue,
3252         .iscsit_response_queue  = isert_response_queue,
3253         .iscsit_get_dataout     = isert_get_dataout,
3254         .iscsit_queue_data_in   = isert_put_datain,
3255         .iscsit_queue_status    = isert_put_response,
3256         .iscsit_aborted_task    = isert_aborted_task,
3257         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3258 };
3259
3260 static int __init isert_init(void)
3261 {
3262         int ret;
3263
3264         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3265         if (!isert_rx_wq) {
3266                 pr_err("Unable to allocate isert_rx_wq\n");
3267                 return -ENOMEM;
3268         }
3269
3270         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3271         if (!isert_comp_wq) {
3272                 pr_err("Unable to allocate isert_comp_wq\n");
3273                 ret = -ENOMEM;
3274                 goto destroy_rx_wq;
3275         }
3276
3277         iscsit_register_transport(&iser_target_transport);
3278         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3279         return 0;
3280
3281 destroy_rx_wq:
3282         destroy_workqueue(isert_rx_wq);
3283         return ret;
3284 }
3285
3286 static void __exit isert_exit(void)
3287 {
3288         destroy_workqueue(isert_comp_wq);
3289         destroy_workqueue(isert_rx_wq);
3290         iscsit_unregister_transport(&iser_target_transport);
3291         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3292 }
3293
3294 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3295 MODULE_VERSION("0.1");
3296 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3297 MODULE_LICENSE("GPL");
3298
3299 module_init(isert_init);
3300 module_exit(isert_exit);