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 <[email protected]>
   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, "
 667                        "rejecting connect request\n");
 668                 ret = rdma_reject(cma_id, NULL, 0);
 669                 goto out_mr;
 670         }
 671
 672         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 673         if (ret)
 674                 goto out_conn_dev;
 675
 676         mutex_lock(&isert_np->np_accept_mutex);
 677         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 678         mutex_unlock(&isert_np->np_accept_mutex);
 679
 680         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 681         up(&isert_np->np_sem);
 682         return 0;
 683
 684 out_conn_dev:
 685         ib_dereg_mr(isert_conn->conn_mr);
 686 out_mr:
 687         ib_dealloc_pd(isert_conn->conn_pd);
 688 out_pd:
 689         isert_device_try_release(device);
 690 out_rsp_dma_map:
 691         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 692                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 693 out_req_dma_map:
 694         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 695                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 696 out_login_buf:
 697         kfree(isert_conn->login_buf);
 698 out:
 699         kfree(isert_conn);
 700         return ret;
 701 }
 702
 703 static void
 704 isert_connect_release(struct isert_conn *isert_conn)
 705 {
 706         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 707         struct isert_device *device = isert_conn->conn_device;
 708         int cq_index;
 709
 710         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 711
 712         if (device && device->use_fastreg)
 713                 isert_conn_free_fastreg_pool(isert_conn);
 714
 715         if (isert_conn->conn_qp) {
 716                 cq_index = ((struct isert_cq_desc *)
 717                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 718                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 719                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 720
 721                 rdma_destroy_qp(isert_conn->conn_cm_id);
 722         }
 723
 724         isert_free_rx_descriptors(isert_conn);
 725         rdma_destroy_id(isert_conn->conn_cm_id);
 726
 727         ib_dereg_mr(isert_conn->conn_mr);
 728         ib_dealloc_pd(isert_conn->conn_pd);
 729
 730         if (isert_conn->login_buf) {
 731                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 732                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 733                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 734                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 735                                     DMA_FROM_DEVICE);
 736                 kfree(isert_conn->login_buf);
 737         }
 738         kfree(isert_conn);
 739
 740         if (device)
 741                 isert_device_try_release(device);
 742
 743         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 744 }
 745
 746 static void
 747 isert_connected_handler(struct rdma_cm_id *cma_id)
 748 {
 749         return;
 750 }
 751
 752 static void
 753 isert_release_conn_kref(struct kref *kref)
 754 {
 755         struct isert_conn *isert_conn = container_of(kref,
 756                                 struct isert_conn, conn_kref);
 757
 758         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 759                  current->comm, current->pid);
 760
 761         isert_connect_release(isert_conn);
 762 }
 763
 764 static void
 765 isert_put_conn(struct isert_conn *isert_conn)
 766 {
 767         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 768 }
 769
 770 static void
 771 isert_disconnect_work(struct work_struct *work)
 772 {
 773         struct isert_conn *isert_conn = container_of(work,
 774                                 struct isert_conn, conn_logout_work);
 775
 776         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 777         mutex_lock(&isert_conn->conn_mutex);
 778         if (isert_conn->state == ISER_CONN_UP)
 779                 isert_conn->state = ISER_CONN_TERMINATING;
 780
 781         if (isert_conn->post_recv_buf_count == 0 &&
 782             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 783                 mutex_unlock(&isert_conn->conn_mutex);
 784                 goto wake_up;
 785         }
 786         if (!isert_conn->conn_cm_id) {
 787                 mutex_unlock(&isert_conn->conn_mutex);
 788                 isert_put_conn(isert_conn);
 789                 return;
 790         }
 791
 792         if (isert_conn->disconnect) {
 793                 /* Send DREQ/DREP towards our initiator */
 794                 rdma_disconnect(isert_conn->conn_cm_id);
 795         }
 796
 797         mutex_unlock(&isert_conn->conn_mutex);
 798
 799 wake_up:
 800         complete(&isert_conn->conn_wait);
 801         isert_put_conn(isert_conn);
 802 }
 803
 804 static void
 805 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
 806 {
 807         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 808
 809         isert_conn->disconnect = disconnect;
 810         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 811         schedule_work(&isert_conn->conn_logout_work);
 812 }
 813
 814 static int
 815 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 816 {
 817         int ret = 0;
 818         bool disconnect = false;
 819
 820         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 821                  event->event, event->status, cma_id->context, cma_id);
 822
 823         switch (event->event) {
 824         case RDMA_CM_EVENT_CONNECT_REQUEST:
 825                 ret = isert_connect_request(cma_id, event);
 826                 break;
 827         case RDMA_CM_EVENT_ESTABLISHED:
 828                 isert_connected_handler(cma_id);
 829                 break;
 830         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 831         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 832         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 833                 disconnect = true;
 834         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 835                 isert_disconnected_handler(cma_id, disconnect);
 836                 break;
 837         case RDMA_CM_EVENT_CONNECT_ERROR:
 838         default:
 839                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 840                 break;
 841         }
 842
 843         if (ret != 0) {
 844                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 845                        event->event, ret);
 846                 dump_stack();
 847         }
 848
 849         return ret;
 850 }
 851
 852 static int
 853 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 854 {
 855         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 856         int i, ret;
 857         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 858         struct iser_rx_desc *rx_desc;
 859
 860         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 861                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 862                 rx_wr->wr_id    = (unsigned long)rx_desc;
 863                 rx_wr->sg_list  = &rx_desc->rx_sg;
 864                 rx_wr->num_sge  = 1;
 865                 rx_wr->next     = rx_wr + 1;
 866                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 867         }
 868
 869         rx_wr--;
 870         rx_wr->next = NULL; /* mark end of work requests list */
 871
 872         isert_conn->post_recv_buf_count += count;
 873         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 874                                 &rx_wr_failed);
 875         if (ret) {
 876                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 877                 isert_conn->post_recv_buf_count -= count;
 878         } else {
 879                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 880                 isert_conn->conn_rx_desc_head = rx_head;
 881         }
 882         return ret;
 883 }
 884
 885 static int
 886 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 887 {
 888         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 889         struct ib_send_wr send_wr, *send_wr_failed;
 890         int ret;
 891
 892         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 893                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 894
 895         send_wr.next    = NULL;
 896         send_wr.wr_id   = (unsigned long)tx_desc;
 897         send_wr.sg_list = tx_desc->tx_sg;
 898         send_wr.num_sge = tx_desc->num_sge;
 899         send_wr.opcode  = IB_WR_SEND;
 900         send_wr.send_flags = IB_SEND_SIGNALED;
 901
 902         atomic_inc(&isert_conn->post_send_buf_count);
 903
 904         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 905         if (ret) {
 906                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 907                 atomic_dec(&isert_conn->post_send_buf_count);
 908         }
 909
 910         return ret;
 911 }
 912
 913 static void
 914 isert_create_send_desc(struct isert_conn *isert_conn,
 915                        struct isert_cmd *isert_cmd,
 916                        struct iser_tx_desc *tx_desc)
 917 {
 918         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 919
 920         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 921                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 922
 923         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 924         tx_desc->iser_header.flags = ISER_VER;
 925
 926         tx_desc->num_sge = 1;
 927         tx_desc->isert_cmd = isert_cmd;
 928
 929         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 930                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 931                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 932         }
 933 }
 934
 935 static int
 936 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 937                    struct iser_tx_desc *tx_desc)
 938 {
 939         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 940         u64 dma_addr;
 941
 942         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 943                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 944         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 945                 pr_err("ib_dma_mapping_error() failed\n");
 946                 return -ENOMEM;
 947         }
 948
 949         tx_desc->dma_addr = dma_addr;
 950         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 951         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 952         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 953
 954         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 955                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 956                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 957
 958         return 0;
 959 }
 960
 961 static void
 962 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 963                    struct ib_send_wr *send_wr, bool coalesce)
 964 {
 965         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 966
 967         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 968         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 969         send_wr->opcode = IB_WR_SEND;
 970         send_wr->sg_list = &tx_desc->tx_sg[0];
 971         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 972         /*
 973          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 974          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 975          */
 976         mutex_lock(&isert_conn->conn_mutex);
 977         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 978             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 979                 tx_desc->llnode_active = true;
 980                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 981                 mutex_unlock(&isert_conn->conn_mutex);
 982                 return;
 983         }
 984         isert_conn->conn_comp_batch = 0;
 985         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 986         mutex_unlock(&isert_conn->conn_mutex);
 987
 988         send_wr->send_flags = IB_SEND_SIGNALED;
 989 }
 990
 991 static int
 992 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 993 {
 994         struct ib_recv_wr rx_wr, *rx_wr_fail;
 995         struct ib_sge sge;
 996         int ret;
 997
 998         memset(&sge, 0, sizeof(struct ib_sge));
 999         sge.addr = isert_conn->login_req_dma;
1000         sge.length = ISER_RX_LOGIN_SIZE;
1001         sge.lkey = isert_conn->conn_mr->lkey;
1002
1003         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1004                 sge.addr, sge.length, sge.lkey);
1005
1006         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1007         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1008         rx_wr.sg_list = &sge;
1009         rx_wr.num_sge = 1;
1010
1011         isert_conn->post_recv_buf_count++;
1012         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1013         if (ret) {
1014                 pr_err("ib_post_recv() failed: %d\n", ret);
1015                 isert_conn->post_recv_buf_count--;
1016         }
1017
1018         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1019         return ret;
1020 }
1021
1022 static int
1023 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1024                    u32 length)
1025 {
1026         struct isert_conn *isert_conn = conn->context;
1027         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1028         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1029         int ret;
1030
1031         isert_create_send_desc(isert_conn, NULL, tx_desc);
1032
1033         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1034                sizeof(struct iscsi_hdr));
1035
1036         isert_init_tx_hdrs(isert_conn, tx_desc);
1037
1038         if (length > 0) {
1039                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1040
1041                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1042                                            length, DMA_TO_DEVICE);
1043
1044                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1045
1046                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1047                                               length, DMA_TO_DEVICE);
1048
1049                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1050                 tx_dsg->length  = length;
1051                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1052                 tx_desc->num_sge = 2;
1053         }
1054         if (!login->login_failed) {
1055                 if (login->login_complete) {
1056                         if (!conn->sess->sess_ops->SessionType &&
1057                             isert_conn->conn_device->use_fastreg) {
1058                                 /* Normal Session and fastreg is used */
1059                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1060
1061                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1062                                                                      pi_support);
1063                                 if (ret) {
1064                                         pr_err("Conn: %p failed to create"
1065                                                " fastreg pool\n", isert_conn);
1066                                         return ret;
1067                                 }
1068                         }
1069
1070                         ret = isert_alloc_rx_descriptors(isert_conn);
1071                         if (ret)
1072                                 return ret;
1073
1074                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1075                         if (ret)
1076                                 return ret;
1077
1078                         isert_conn->state = ISER_CONN_UP;
1079                         goto post_send;
1080                 }
1081
1082                 ret = isert_rdma_post_recvl(isert_conn);
1083                 if (ret)
1084                         return ret;
1085         }
1086 post_send:
1087         ret = isert_post_send(isert_conn, tx_desc);
1088         if (ret)
1089                 return ret;
1090
1091         return 0;
1092 }
1093
1094 static void
1095 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1096                    struct isert_conn *isert_conn)
1097 {
1098         struct iscsi_conn *conn = isert_conn->conn;
1099         struct iscsi_login *login = conn->conn_login;
1100         int size;
1101
1102         if (!login) {
1103                 pr_err("conn->conn_login is NULL\n");
1104                 dump_stack();
1105                 return;
1106         }
1107
1108         if (login->first_request) {
1109                 struct iscsi_login_req *login_req =
1110                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1111                 /*
1112                  * Setup the initial iscsi_login values from the leading
1113                  * login request PDU.
1114                  */
1115                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1116                 login->current_stage =
1117                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1118                          >> 2;
1119                 login->version_min      = login_req->min_version;
1120                 login->version_max      = login_req->max_version;
1121                 memcpy(login->isid, login_req->isid, 6);
1122                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1123                 login->init_task_tag    = login_req->itt;
1124                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1125                 login->cid              = be16_to_cpu(login_req->cid);
1126                 login->tsih             = be16_to_cpu(login_req->tsih);
1127         }
1128
1129         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1130
1131         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1132         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1133                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1134         memcpy(login->req_buf, &rx_desc->data[0], size);
1135
1136         if (login->first_request) {
1137                 complete(&isert_conn->conn_login_comp);
1138                 return;
1139         }
1140         schedule_delayed_work(&conn->login_work, 0);
1141 }
1142
1143 static struct iscsi_cmd
1144 *isert_allocate_cmd(struct iscsi_conn *conn)
1145 {
1146         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1147         struct isert_cmd *isert_cmd;
1148         struct iscsi_cmd *cmd;
1149
1150         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1151         if (!cmd) {
1152                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1153                 return NULL;
1154         }
1155         isert_cmd = iscsit_priv_cmd(cmd);
1156         isert_cmd->conn = isert_conn;
1157         isert_cmd->iscsi_cmd = cmd;
1158
1159         return cmd;
1160 }
1161
1162 static int
1163 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1164                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1165                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1166 {
1167         struct iscsi_conn *conn = isert_conn->conn;
1168         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1169         struct scatterlist *sg;
1170         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1171         bool dump_payload = false;
1172
1173         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1174         if (rc < 0)
1175                 return rc;
1176
1177         imm_data = cmd->immediate_data;
1178         imm_data_len = cmd->first_burst_len;
1179         unsol_data = cmd->unsolicited_data;
1180
1181         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1182         if (rc < 0) {
1183                 return 0;
1184         } else if (rc > 0) {
1185                 dump_payload = true;
1186                 goto sequence_cmd;
1187         }
1188
1189         if (!imm_data)
1190                 return 0;
1191
1192         sg = &cmd->se_cmd.t_data_sg[0];
1193         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1194
1195         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1196                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1197
1198         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1199
1200         cmd->write_data_done += imm_data_len;
1201
1202         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1203                 spin_lock_bh(&cmd->istate_lock);
1204                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1205                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1206                 spin_unlock_bh(&cmd->istate_lock);
1207         }
1208
1209 sequence_cmd:
1210         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1211
1212         if (!rc && dump_payload == false && unsol_data)
1213                 iscsit_set_unsoliticed_dataout(cmd);
1214         else if (dump_payload && imm_data)
1215                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1216
1217         return 0;
1218 }
1219
1220 static int
1221 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1222                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1223 {
1224         struct scatterlist *sg_start;
1225         struct iscsi_conn *conn = isert_conn->conn;
1226         struct iscsi_cmd *cmd = NULL;
1227         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1228         u32 unsol_data_len = ntoh24(hdr->dlength);
1229         int rc, sg_nents, sg_off, page_off;
1230
1231         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1232         if (rc < 0)
1233                 return rc;
1234         else if (!cmd)
1235                 return 0;
1236         /*
1237          * FIXME: Unexpected unsolicited_data out
1238          */
1239         if (!cmd->unsolicited_data) {
1240                 pr_err("Received unexpected solicited data payload\n");
1241                 dump_stack();
1242                 return -1;
1243         }
1244
1245         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1246                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1247
1248         sg_off = cmd->write_data_done / PAGE_SIZE;
1249         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1250         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1251         page_off = cmd->write_data_done % PAGE_SIZE;
1252         /*
1253          * FIXME: Non page-aligned unsolicited_data out
1254          */
1255         if (page_off) {
1256                 pr_err("Received unexpected non-page aligned data payload\n");
1257                 dump_stack();
1258                 return -1;
1259         }
1260         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1261                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1262
1263         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1264                             unsol_data_len);
1265
1266         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1267         if (rc < 0)
1268                 return rc;
1269
1270         return 0;
1271 }
1272
1273 static int
1274 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1275                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1276                      unsigned char *buf)
1277 {
1278         struct iscsi_conn *conn = isert_conn->conn;
1279         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1280         int rc;
1281
1282         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1283         if (rc < 0)
1284                 return rc;
1285         /*
1286          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1287          */
1288
1289         return iscsit_process_nop_out(conn, cmd, hdr);
1290 }
1291
1292 static int
1293 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1294                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1295                       struct iscsi_text *hdr)
1296 {
1297         struct iscsi_conn *conn = isert_conn->conn;
1298         u32 payload_length = ntoh24(hdr->dlength);
1299         int rc;
1300         unsigned char *text_in;
1301
1302         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1303         if (rc < 0)
1304                 return rc;
1305
1306         text_in = kzalloc(payload_length, GFP_KERNEL);
1307         if (!text_in) {
1308                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1309                        payload_length);
1310                 return -ENOMEM;
1311         }
1312         cmd->text_in_ptr = text_in;
1313
1314         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1315
1316         return iscsit_process_text_cmd(conn, cmd, hdr);
1317 }
1318
1319 static int
1320 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1321                 uint32_t read_stag, uint64_t read_va,
1322                 uint32_t write_stag, uint64_t write_va)
1323 {
1324         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1325         struct iscsi_conn *conn = isert_conn->conn;
1326         struct iscsi_session *sess = conn->sess;
1327         struct iscsi_cmd *cmd;
1328         struct isert_cmd *isert_cmd;
1329         int ret = -EINVAL;
1330         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1331
1332         if (sess->sess_ops->SessionType &&
1333            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1334                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1335                        " ignoring\n", opcode);
1336                 return 0;
1337         }
1338
1339         switch (opcode) {
1340         case ISCSI_OP_SCSI_CMD:
1341                 cmd = isert_allocate_cmd(conn);
1342                 if (!cmd)
1343                         break;
1344
1345                 isert_cmd = iscsit_priv_cmd(cmd);
1346                 isert_cmd->read_stag = read_stag;
1347                 isert_cmd->read_va = read_va;
1348                 isert_cmd->write_stag = write_stag;
1349                 isert_cmd->write_va = write_va;
1350
1351                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1352                                         rx_desc, (unsigned char *)hdr);
1353                 break;
1354         case ISCSI_OP_NOOP_OUT:
1355                 cmd = isert_allocate_cmd(conn);
1356                 if (!cmd)
1357                         break;
1358
1359                 isert_cmd = iscsit_priv_cmd(cmd);
1360                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1361                                            rx_desc, (unsigned char *)hdr);
1362                 break;
1363         case ISCSI_OP_SCSI_DATA_OUT:
1364                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1365                                                 (unsigned char *)hdr);
1366                 break;
1367         case ISCSI_OP_SCSI_TMFUNC:
1368                 cmd = isert_allocate_cmd(conn);
1369                 if (!cmd)
1370                         break;
1371
1372                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1373                                                 (unsigned char *)hdr);
1374                 break;
1375         case ISCSI_OP_LOGOUT:
1376                 cmd = isert_allocate_cmd(conn);
1377                 if (!cmd)
1378                         break;
1379
1380                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1381                 if (ret > 0)
1382                         wait_for_completion_timeout(&conn->conn_logout_comp,
1383                                                     SECONDS_FOR_LOGOUT_COMP *
1384                                                     HZ);
1385                 break;
1386         case ISCSI_OP_TEXT:
1387                 cmd = isert_allocate_cmd(conn);
1388                 if (!cmd)
1389                         break;
1390
1391                 isert_cmd = iscsit_priv_cmd(cmd);
1392                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1393                                             rx_desc, (struct iscsi_text *)hdr);
1394                 break;
1395         default:
1396                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1397                 dump_stack();
1398                 break;
1399         }
1400
1401         return ret;
1402 }
1403
1404 static void
1405 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1406 {
1407         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1408         uint64_t read_va = 0, write_va = 0;
1409         uint32_t read_stag = 0, write_stag = 0;
1410         int rc;
1411
1412         switch (iser_hdr->flags & 0xF0) {
1413         case ISCSI_CTRL:
1414                 if (iser_hdr->flags & ISER_RSV) {
1415                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1416                         read_va = be64_to_cpu(iser_hdr->read_va);
1417                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1418                                  read_stag, (unsigned long long)read_va);
1419                 }
1420                 if (iser_hdr->flags & ISER_WSV) {
1421                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1422                         write_va = be64_to_cpu(iser_hdr->write_va);
1423                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1424                                  write_stag, (unsigned long long)write_va);
1425                 }
1426
1427                 pr_debug("ISER ISCSI_CTRL PDU\n");
1428                 break;
1429         case ISER_HELLO:
1430                 pr_err("iSER Hello message\n");
1431                 break;
1432         default:
1433                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1434                 break;
1435         }
1436
1437         rc = isert_rx_opcode(isert_conn, rx_desc,
1438                              read_stag, read_va, write_stag, write_va);
1439 }
1440
1441 static void
1442 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1443                     unsigned long xfer_len)
1444 {
1445         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1446         struct iscsi_hdr *hdr;
1447         u64 rx_dma;
1448         int rx_buflen, outstanding;
1449
1450         if ((char *)desc == isert_conn->login_req_buf) {
1451                 rx_dma = isert_conn->login_req_dma;
1452                 rx_buflen = ISER_RX_LOGIN_SIZE;
1453                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1454                          rx_dma, rx_buflen);
1455         } else {
1456                 rx_dma = desc->dma_addr;
1457                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1458                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1459                          rx_dma, rx_buflen);
1460         }
1461
1462         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1463
1464         hdr = &desc->iscsi_header;
1465         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1466                  hdr->opcode, hdr->itt, hdr->flags,
1467                  (int)(xfer_len - ISER_HEADERS_LEN));
1468
1469         if ((char *)desc == isert_conn->login_req_buf)
1470                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1471                                    isert_conn);
1472         else
1473                 isert_rx_do_work(desc, isert_conn);
1474
1475         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1476                                       DMA_FROM_DEVICE);
1477
1478         isert_conn->post_recv_buf_count--;
1479         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1480                  isert_conn->post_recv_buf_count);
1481
1482         if ((char *)desc == isert_conn->login_req_buf)
1483                 return;
1484
1485         outstanding = isert_conn->post_recv_buf_count;
1486         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1487                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1488                                 ISERT_MIN_POSTED_RX);
1489                 err = isert_post_recv(isert_conn, count);
1490                 if (err) {
1491                         pr_err("isert_post_recv() count: %d failed, %d\n",
1492                                count, err);
1493                 }
1494         }
1495 }
1496
1497 static int
1498 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1499                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1500                    enum iser_ib_op_code op, struct isert_data_buf *data)
1501 {
1502         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1503
1504         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1505                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1506
1507         data->len = length - offset;
1508         data->offset = offset;
1509         data->sg_off = data->offset / PAGE_SIZE;
1510
1511         data->sg = &sg[data->sg_off];
1512         data->nents = min_t(unsigned int, nents - data->sg_off,
1513                                           ISCSI_ISER_SG_TABLESIZE);
1514         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1515                                         PAGE_SIZE);
1516
1517         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1518                                         data->dma_dir);
1519         if (unlikely(!data->dma_nents)) {
1520                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1521                 return -EINVAL;
1522         }
1523
1524         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1525                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1526
1527         return 0;
1528 }
1529
1530 static void
1531 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1532 {
1533         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1534
1535         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1536         memset(data, 0, sizeof(*data));
1537 }
1538
1539
1540
1541 static void
1542 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1543 {
1544         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1545
1546         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1547
1548         if (wr->data.sg) {
1549                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1550                 isert_unmap_data_buf(isert_conn, &wr->data);
1551         }
1552
1553         if (wr->send_wr) {
1554                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1555                 kfree(wr->send_wr);
1556                 wr->send_wr = NULL;
1557         }
1558
1559         if (wr->ib_sge) {
1560                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1561                 kfree(wr->ib_sge);
1562                 wr->ib_sge = NULL;
1563         }
1564 }
1565
1566 static void
1567 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1568 {
1569         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1570         LIST_HEAD(unmap_list);
1571
1572         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1573
1574         if (wr->fr_desc) {
1575                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1576                          isert_cmd, wr->fr_desc);
1577                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1578                         isert_unmap_data_buf(isert_conn, &wr->prot);
1579                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1580                 }
1581                 spin_lock_bh(&isert_conn->conn_lock);
1582                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1583                 spin_unlock_bh(&isert_conn->conn_lock);
1584                 wr->fr_desc = NULL;
1585         }
1586
1587         if (wr->data.sg) {
1588                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1589                 isert_unmap_data_buf(isert_conn, &wr->data);
1590         }
1591
1592         wr->ib_sge = NULL;
1593         wr->send_wr = NULL;
1594 }
1595
1596 static void
1597 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1598 {
1599         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1600         struct isert_conn *isert_conn = isert_cmd->conn;
1601         struct iscsi_conn *conn = isert_conn->conn;
1602         struct isert_device *device = isert_conn->conn_device;
1603
1604         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1605
1606         switch (cmd->iscsi_opcode) {
1607         case ISCSI_OP_SCSI_CMD:
1608                 spin_lock_bh(&conn->cmd_lock);
1609                 if (!list_empty(&cmd->i_conn_node))
1610                         list_del_init(&cmd->i_conn_node);
1611                 spin_unlock_bh(&conn->cmd_lock);
1612
1613                 if (cmd->data_direction == DMA_TO_DEVICE) {
1614                         iscsit_stop_dataout_timer(cmd);
1615                         /*
1616                          * Check for special case during comp_err where
1617                          * WRITE_PENDING has been handed off from core,
1618                          * but requires an extra target_put_sess_cmd()
1619                          * before transport_generic_free_cmd() below.
1620                          */
1621                         if (comp_err &&
1622                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1623                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1624
1625                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1626                         }
1627                 }
1628
1629                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1630                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1631                 break;
1632         case ISCSI_OP_SCSI_TMFUNC:
1633                 spin_lock_bh(&conn->cmd_lock);
1634                 if (!list_empty(&cmd->i_conn_node))
1635                         list_del_init(&cmd->i_conn_node);
1636                 spin_unlock_bh(&conn->cmd_lock);
1637
1638                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1639                 break;
1640         case ISCSI_OP_REJECT:
1641         case ISCSI_OP_NOOP_OUT:
1642         case ISCSI_OP_TEXT:
1643                 spin_lock_bh(&conn->cmd_lock);
1644                 if (!list_empty(&cmd->i_conn_node))
1645                         list_del_init(&cmd->i_conn_node);
1646                 spin_unlock_bh(&conn->cmd_lock);
1647
1648                 /*
1649                  * Handle special case for REJECT when iscsi_add_reject*() has
1650                  * overwritten the original iscsi_opcode assignment, and the
1651                  * associated cmd->se_cmd needs to be released.
1652                  */
1653                 if (cmd->se_cmd.se_tfo != NULL) {
1654                         pr_debug("Calling transport_generic_free_cmd from"
1655                                  " isert_put_cmd for 0x%02x\n",
1656                                  cmd->iscsi_opcode);
1657                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1658                         break;
1659                 }
1660                 /*
1661                  * Fall-through
1662                  */
1663         default:
1664                 iscsit_release_cmd(cmd);
1665                 break;
1666         }
1667 }
1668
1669 static void
1670 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1671 {
1672         if (tx_desc->dma_addr != 0) {
1673                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1674                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1675                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1676                 tx_desc->dma_addr = 0;
1677         }
1678 }
1679
1680 static void
1681 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1682                      struct ib_device *ib_dev, bool comp_err)
1683 {
1684         if (isert_cmd->pdu_buf_dma != 0) {
1685                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1686                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1687                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1688                 isert_cmd->pdu_buf_dma = 0;
1689         }
1690
1691         isert_unmap_tx_desc(tx_desc, ib_dev);
1692         isert_put_cmd(isert_cmd, comp_err);
1693 }
1694
1695 static int
1696 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1697 {
1698         struct ib_mr_status mr_status;
1699         int ret;
1700
1701         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1702         if (ret) {
1703                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1704                 goto fail_mr_status;
1705         }
1706
1707         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1708                 u64 sec_offset_err;
1709                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1710
1711                 switch (mr_status.sig_err.err_type) {
1712                 case IB_SIG_BAD_GUARD:
1713                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1714                         break;
1715                 case IB_SIG_BAD_REFTAG:
1716                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1717                         break;
1718                 case IB_SIG_BAD_APPTAG:
1719                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1720                         break;
1721                 }
1722                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1723                 do_div(sec_offset_err, block_size);
1724                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1725
1726                 pr_err("isert: PI error found type %d at sector 0x%llx "
1727                        "expected 0x%x vs actual 0x%x\n",
1728                        mr_status.sig_err.err_type,
1729                        (unsigned long long)se_cmd->bad_sector,
1730                        mr_status.sig_err.expected,
1731                        mr_status.sig_err.actual);
1732                 ret = 1;
1733         }
1734
1735 fail_mr_status:
1736         return ret;
1737 }
1738
1739 static void
1740 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1741                             struct isert_cmd *isert_cmd)
1742 {
1743         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1744         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1745         struct se_cmd *se_cmd = &cmd->se_cmd;
1746         struct isert_conn *isert_conn = isert_cmd->conn;
1747         struct isert_device *device = isert_conn->conn_device;
1748         int ret = 0;
1749
1750         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1751                 ret = isert_check_pi_status(se_cmd,
1752                                             wr->fr_desc->pi_ctx->sig_mr);
1753                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1754         }
1755
1756         device->unreg_rdma_mem(isert_cmd, isert_conn);
1757         wr->send_wr_num = 0;
1758         if (ret)
1759                 transport_send_check_condition_and_sense(se_cmd,
1760                                                          se_cmd->pi_err, 0);
1761         else
1762                 isert_put_response(isert_conn->conn, cmd);
1763 }
1764
1765 static void
1766 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1767                            struct isert_cmd *isert_cmd)
1768 {
1769         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1770         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1771         struct se_cmd *se_cmd = &cmd->se_cmd;
1772         struct isert_conn *isert_conn = isert_cmd->conn;
1773         struct isert_device *device = isert_conn->conn_device;
1774         int ret = 0;
1775
1776         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1777                 ret = isert_check_pi_status(se_cmd,
1778                                             wr->fr_desc->pi_ctx->sig_mr);
1779                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1780         }
1781
1782         iscsit_stop_dataout_timer(cmd);
1783         device->unreg_rdma_mem(isert_cmd, isert_conn);
1784         cmd->write_data_done = wr->data.len;
1785         wr->send_wr_num = 0;
1786
1787         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1788         spin_lock_bh(&cmd->istate_lock);
1789         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1790         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1791         spin_unlock_bh(&cmd->istate_lock);
1792
1793         if (ret)
1794                 transport_send_check_condition_and_sense(se_cmd,
1795                                                          se_cmd->pi_err, 0);
1796         else
1797                 target_execute_cmd(se_cmd);
1798 }
1799
1800 static void
1801 isert_do_control_comp(struct work_struct *work)
1802 {
1803         struct isert_cmd *isert_cmd = container_of(work,
1804                         struct isert_cmd, comp_work);
1805         struct isert_conn *isert_conn = isert_cmd->conn;
1806         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1807         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1808
1809         switch (cmd->i_state) {
1810         case ISTATE_SEND_TASKMGTRSP:
1811                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1812
1813                 atomic_dec(&isert_conn->post_send_buf_count);
1814                 iscsit_tmr_post_handler(cmd, cmd->conn);
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_REJECT:
1820                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1821                 atomic_dec(&isert_conn->post_send_buf_count);
1822
1823                 cmd->i_state = ISTATE_SENT_STATUS;
1824                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1825                 break;
1826         case ISTATE_SEND_LOGOUTRSP:
1827                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1828
1829                 atomic_dec(&isert_conn->post_send_buf_count);
1830                 iscsit_logout_post_handler(cmd, cmd->conn);
1831                 break;
1832         case ISTATE_SEND_TEXTRSP:
1833                 atomic_dec(&isert_conn->post_send_buf_count);
1834                 cmd->i_state = ISTATE_SENT_STATUS;
1835                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1836                 break;
1837         default:
1838                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1839                 dump_stack();
1840                 break;
1841         }
1842 }
1843
1844 static void
1845 isert_response_completion(struct iser_tx_desc *tx_desc,
1846                           struct isert_cmd *isert_cmd,
1847                           struct isert_conn *isert_conn,
1848                           struct ib_device *ib_dev)
1849 {
1850         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1851         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1852
1853         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1854             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1855             cmd->i_state == ISTATE_SEND_REJECT ||
1856             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1857                 isert_unmap_tx_desc(tx_desc, ib_dev);
1858
1859                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1860                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1861                 return;
1862         }
1863
1864         /**
1865          * If send_wr_num is 0 this means that we got
1866          * RDMA completion and we cleared it and we should
1867          * simply decrement the response post. else the
1868          * response is incorporated in send_wr_num, just
1869          * sub it.
1870          **/
1871         if (wr->send_wr_num)
1872                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1873         else
1874                 atomic_dec(&isert_conn->post_send_buf_count);
1875
1876         cmd->i_state = ISTATE_SENT_STATUS;
1877         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1878 }
1879
1880 static void
1881 __isert_send_completion(struct iser_tx_desc *tx_desc,
1882                         struct isert_conn *isert_conn)
1883 {
1884         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1885         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1886         struct isert_rdma_wr *wr;
1887
1888         if (!isert_cmd) {
1889                 atomic_dec(&isert_conn->post_send_buf_count);
1890                 isert_unmap_tx_desc(tx_desc, ib_dev);
1891                 return;
1892         }
1893         wr = &isert_cmd->rdma_wr;
1894
1895         switch (wr->iser_ib_op) {
1896         case ISER_IB_RECV:
1897                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1898                 dump_stack();
1899                 break;
1900         case ISER_IB_SEND:
1901                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1902                 isert_response_completion(tx_desc, isert_cmd,
1903                                           isert_conn, ib_dev);
1904                 break;
1905         case ISER_IB_RDMA_WRITE:
1906                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1907                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1908                 isert_completion_rdma_write(tx_desc, isert_cmd);
1909                 break;
1910         case ISER_IB_RDMA_READ:
1911                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1912
1913                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1914                 isert_completion_rdma_read(tx_desc, isert_cmd);
1915                 break;
1916         default:
1917                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1918                 dump_stack();
1919                 break;
1920         }
1921 }
1922
1923 static void
1924 isert_send_completion(struct iser_tx_desc *tx_desc,
1925                       struct isert_conn *isert_conn)
1926 {
1927         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1928         struct iser_tx_desc *t;
1929         /*
1930          * Drain coalesced completion llist starting from comp_llnode_batch
1931          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1932          */
1933         while (llnode) {
1934                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1935                 llnode = llist_next(llnode);
1936                 __isert_send_completion(t, isert_conn);
1937         }
1938         __isert_send_completion(tx_desc, isert_conn);
1939 }
1940
1941 static void
1942 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1943 {
1944         struct llist_node *llnode;
1945         struct isert_rdma_wr *wr;
1946         struct iser_tx_desc *t;
1947
1948         mutex_lock(&isert_conn->conn_mutex);
1949         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1950         isert_conn->conn_comp_batch = 0;
1951         mutex_unlock(&isert_conn->conn_mutex);
1952
1953         while (llnode) {
1954                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1955                 llnode = llist_next(llnode);
1956                 wr = &t->isert_cmd->rdma_wr;
1957
1958                 /**
1959                  * If send_wr_num is 0 this means that we got
1960                  * RDMA completion and we cleared it and we should
1961                  * simply decrement the response post. else the
1962                  * response is incorporated in send_wr_num, just
1963                  * sub it.
1964                  **/
1965                 if (wr->send_wr_num)
1966                         atomic_sub(wr->send_wr_num,
1967                                    &isert_conn->post_send_buf_count);
1968                 else
1969                         atomic_dec(&isert_conn->post_send_buf_count);
1970
1971                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1972         }
1973 }
1974
1975 static void
1976 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1977 {
1978         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1979         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1980         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1981         struct isert_rdma_wr *wr;
1982         struct iser_tx_desc *t;
1983
1984         while (llnode) {
1985                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1986                 llnode = llist_next(llnode);
1987                 wr = &t->isert_cmd->rdma_wr;
1988
1989                 /**
1990                  * If send_wr_num is 0 this means that we got
1991                  * RDMA completion and we cleared it and we should
1992                  * simply decrement the response post. else the
1993                  * response is incorporated in send_wr_num, just
1994                  * sub it.
1995                  **/
1996                 if (wr->send_wr_num)
1997                         atomic_sub(wr->send_wr_num,
1998                                    &isert_conn->post_send_buf_count);
1999                 else
2000                         atomic_dec(&isert_conn->post_send_buf_count);
2001
2002                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2003         }
2004         tx_desc->comp_llnode_batch = NULL;
2005
2006         if (!isert_cmd)
2007                 isert_unmap_tx_desc(tx_desc, ib_dev);
2008         else
2009                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2010 }
2011
2012 static void
2013 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2014 {
2015         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2016         struct iscsi_conn *conn = isert_conn->conn;
2017
2018         if (isert_conn->post_recv_buf_count)
2019                 return;
2020
2021         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2022
2023         if (conn->sess) {
2024                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2025                 target_wait_for_sess_cmds(conn->sess->se_sess);
2026         }
2027
2028         while (atomic_read(&isert_conn->post_send_buf_count))
2029                 msleep(3000);
2030
2031         mutex_lock(&isert_conn->conn_mutex);
2032         isert_conn->state = ISER_CONN_DOWN;
2033         mutex_unlock(&isert_conn->conn_mutex);
2034
2035         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2036
2037         complete(&isert_conn->conn_wait_comp_err);
2038 }
2039
2040 static void
2041 isert_cq_tx_work(struct work_struct *work)
2042 {
2043         struct isert_cq_desc *cq_desc = container_of(work,
2044                                 struct isert_cq_desc, cq_tx_work);
2045         struct isert_device *device = cq_desc->device;
2046         int cq_index = cq_desc->cq_index;
2047         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2048         struct isert_conn *isert_conn;
2049         struct iser_tx_desc *tx_desc;
2050         struct ib_wc wc;
2051
2052         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2053                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2054                 isert_conn = wc.qp->qp_context;
2055
2056                 if (wc.status == IB_WC_SUCCESS) {
2057                         isert_send_completion(tx_desc, isert_conn);
2058                 } else {
2059                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2060                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2061                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2062
2063                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2064                                 if (tx_desc->llnode_active)
2065                                         continue;
2066
2067                                 atomic_dec(&isert_conn->post_send_buf_count);
2068                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2069                         }
2070                 }
2071         }
2072
2073         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2074 }
2075
2076 static void
2077 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2078 {
2079         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2080
2081         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2082 }
2083
2084 static void
2085 isert_cq_rx_work(struct work_struct *work)
2086 {
2087         struct isert_cq_desc *cq_desc = container_of(work,
2088                         struct isert_cq_desc, cq_rx_work);
2089         struct isert_device *device = cq_desc->device;
2090         int cq_index = cq_desc->cq_index;
2091         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2092         struct isert_conn *isert_conn;
2093         struct iser_rx_desc *rx_desc;
2094         struct ib_wc wc;
2095         unsigned long xfer_len;
2096
2097         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2098                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2099                 isert_conn = wc.qp->qp_context;
2100
2101                 if (wc.status == IB_WC_SUCCESS) {
2102                         xfer_len = (unsigned long)wc.byte_len;
2103                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2104                 } else {
2105                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2106                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2107                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2108                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2109                                          wc.vendor_err);
2110                         }
2111                         isert_conn->post_recv_buf_count--;
2112                         isert_cq_rx_comp_err(isert_conn);
2113                 }
2114         }
2115
2116         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2117 }
2118
2119 static void
2120 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2121 {
2122         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2123
2124         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2125 }
2126
2127 static int
2128 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2129 {
2130         struct ib_send_wr *wr_failed;
2131         int ret;
2132
2133         atomic_inc(&isert_conn->post_send_buf_count);
2134
2135         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2136                            &wr_failed);
2137         if (ret) {
2138                 pr_err("ib_post_send failed with %d\n", ret);
2139                 atomic_dec(&isert_conn->post_send_buf_count);
2140                 return ret;
2141         }
2142         return ret;
2143 }
2144
2145 static int
2146 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2147 {
2148         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2149         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2150         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2151         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2152                                 &isert_cmd->tx_desc.iscsi_header;
2153
2154         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2155         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2156         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2157         /*
2158          * Attach SENSE DATA payload to iSCSI Response PDU
2159          */
2160         if (cmd->se_cmd.sense_buffer &&
2161             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2162             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2163                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2164                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2165                 u32 padding, pdu_len;
2166
2167                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2168                                    cmd->sense_buffer);
2169                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2170
2171                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2172                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2173                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2174
2175                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2176                                 (void *)cmd->sense_buffer, pdu_len,
2177                                 DMA_TO_DEVICE);
2178
2179                 isert_cmd->pdu_buf_len = pdu_len;
2180                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2181                 tx_dsg->length  = pdu_len;
2182                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2183                 isert_cmd->tx_desc.num_sge = 2;
2184         }
2185
2186         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2187
2188         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2189
2190         return isert_post_response(isert_conn, isert_cmd);
2191 }
2192
2193 static void
2194 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2195 {
2196         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2197         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2198         struct isert_device *device = isert_conn->conn_device;
2199
2200         spin_lock_bh(&conn->cmd_lock);
2201         if (!list_empty(&cmd->i_conn_node))
2202                 list_del_init(&cmd->i_conn_node);
2203         spin_unlock_bh(&conn->cmd_lock);
2204
2205         if (cmd->data_direction == DMA_TO_DEVICE)
2206                 iscsit_stop_dataout_timer(cmd);
2207
2208         device->unreg_rdma_mem(isert_cmd, isert_conn);
2209 }
2210
2211 static enum target_prot_op
2212 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2213 {
2214         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2215         struct isert_device *device = isert_conn->conn_device;
2216
2217         if (device->pi_capable)
2218                 return TARGET_PROT_ALL;
2219
2220         return TARGET_PROT_NORMAL;
2221 }
2222
2223 static int
2224 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2225                 bool nopout_response)
2226 {
2227         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2228         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2229         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2230
2231         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2232         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2233                                &isert_cmd->tx_desc.iscsi_header,
2234                                nopout_response);
2235         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2236         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2237
2238         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2239
2240         return isert_post_response(isert_conn, isert_cmd);
2241 }
2242
2243 static int
2244 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2245 {
2246         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2247         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2248         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2249
2250         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2251         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2252                                 &isert_cmd->tx_desc.iscsi_header);
2253         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2254         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2255
2256         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2257
2258         return isert_post_response(isert_conn, isert_cmd);
2259 }
2260
2261 static int
2262 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2263 {
2264         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2265         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2266         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2267
2268         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2269         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2270                                   &isert_cmd->tx_desc.iscsi_header);
2271         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2272         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2273
2274         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2275
2276         return isert_post_response(isert_conn, isert_cmd);
2277 }
2278
2279 static int
2280 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2281 {
2282         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2283         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2284         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2285         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2286         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2287         struct iscsi_reject *hdr =
2288                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2289
2290         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2291         iscsit_build_reject(cmd, conn, hdr);
2292         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2293
2294         hton24(hdr->dlength, ISCSI_HDR_LEN);
2295         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2296                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2297                         DMA_TO_DEVICE);
2298         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2299         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2300         tx_dsg->length  = ISCSI_HDR_LEN;
2301         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2302         isert_cmd->tx_desc.num_sge = 2;
2303
2304         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2305
2306         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2307
2308         return isert_post_response(isert_conn, isert_cmd);
2309 }
2310
2311 static int
2312 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2313 {
2314         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2315         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2316         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2317         struct iscsi_text_rsp *hdr =
2318                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2319         u32 txt_rsp_len;
2320         int rc;
2321
2322         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2323         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2324         if (rc < 0)
2325                 return rc;
2326
2327         txt_rsp_len = rc;
2328         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2329
2330         if (txt_rsp_len) {
2331                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2332                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2333                 void *txt_rsp_buf = cmd->buf_ptr;
2334
2335                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2336                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2337
2338                 isert_cmd->pdu_buf_len = txt_rsp_len;
2339                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2340                 tx_dsg->length  = txt_rsp_len;
2341                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2342                 isert_cmd->tx_desc.num_sge = 2;
2343         }
2344         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2345
2346         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2347
2348         return isert_post_response(isert_conn, isert_cmd);
2349 }
2350
2351 static int
2352 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2353                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2354                     u32 data_left, u32 offset)
2355 {
2356         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2357         struct scatterlist *sg_start, *tmp_sg;
2358         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2359         u32 sg_off, page_off;
2360         int i = 0, sg_nents;
2361
2362         sg_off = offset / PAGE_SIZE;
2363         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2364         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2365         page_off = offset % PAGE_SIZE;
2366
2367         send_wr->sg_list = ib_sge;
2368         send_wr->num_sge = sg_nents;
2369         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2370         /*
2371          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2372          */
2373         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2374                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2375                          (unsigned long long)tmp_sg->dma_address,
2376                          tmp_sg->length, page_off);
2377
2378                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2379                 ib_sge->length = min_t(u32, data_left,
2380                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2381                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2382
2383                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2384                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2385                 page_off = 0;
2386                 data_left -= ib_sge->length;
2387                 ib_sge++;
2388                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2389         }
2390
2391         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2392                  send_wr->sg_list, send_wr->num_sge);
2393
2394         return sg_nents;
2395 }
2396
2397 static int
2398 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2399                struct isert_rdma_wr *wr)
2400 {
2401         struct se_cmd *se_cmd = &cmd->se_cmd;
2402         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2403         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2404         struct isert_data_buf *data = &wr->data;
2405         struct ib_send_wr *send_wr;
2406         struct ib_sge *ib_sge;
2407         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2408         int ret = 0, i, ib_sge_cnt;
2409
2410         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2411
2412         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2413         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2414                                  se_cmd->t_data_nents, se_cmd->data_length,
2415                                  offset, wr->iser_ib_op, &wr->data);
2416         if (ret)
2417                 return ret;
2418
2419         data_left = data->len;
2420         offset = data->offset;
2421
2422         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2423         if (!ib_sge) {
2424                 pr_warn("Unable to allocate ib_sge\n");
2425                 ret = -ENOMEM;
2426                 goto unmap_cmd;
2427         }
2428         wr->ib_sge = ib_sge;
2429
2430         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2431         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2432                                 GFP_KERNEL);
2433         if (!wr->send_wr) {
2434                 pr_debug("Unable to allocate wr->send_wr\n");
2435                 ret = -ENOMEM;
2436                 goto unmap_cmd;
2437         }
2438
2439         wr->isert_cmd = isert_cmd;
2440         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2441
2442         for (i = 0; i < wr->send_wr_num; i++) {
2443                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2444                 data_len = min(data_left, rdma_write_max);
2445
2446                 send_wr->send_flags = 0;
2447                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2448                         send_wr->opcode = IB_WR_RDMA_WRITE;
2449                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2450                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2451                         if (i + 1 == wr->send_wr_num)
2452                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2453                         else
2454                                 send_wr->next = &wr->send_wr[i + 1];
2455                 } else {
2456                         send_wr->opcode = IB_WR_RDMA_READ;
2457                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2458                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2459                         if (i + 1 == wr->send_wr_num)
2460                                 send_wr->send_flags = IB_SEND_SIGNALED;
2461                         else
2462                                 send_wr->next = &wr->send_wr[i + 1];
2463                 }
2464
2465                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2466                                         send_wr, data_len, offset);
2467                 ib_sge += ib_sge_cnt;
2468
2469                 offset += data_len;
2470                 va_offset += data_len;
2471                 data_left -= data_len;
2472         }
2473
2474         return 0;
2475 unmap_cmd:
2476         isert_unmap_data_buf(isert_conn, data);
2477
2478         return ret;
2479 }
2480
2481 static int
2482 isert_map_fr_pagelist(struct ib_device *ib_dev,
2483                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2484 {
2485         u64 start_addr, end_addr, page, chunk_start = 0;
2486         struct scatterlist *tmp_sg;
2487         int i = 0, new_chunk, last_ent, n_pages;
2488
2489         n_pages = 0;
2490         new_chunk = 1;
2491         last_ent = sg_nents - 1;
2492         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2493                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2494                 if (new_chunk)
2495                         chunk_start = start_addr;
2496                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2497
2498                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2499                          i, (unsigned long long)tmp_sg->dma_address,
2500                          tmp_sg->length);
2501
2502                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2503                         new_chunk = 0;
2504                         continue;
2505                 }
2506                 new_chunk = 1;
2507
2508                 page = chunk_start & PAGE_MASK;
2509                 do {
2510                         fr_pl[n_pages++] = page;
2511                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2512                                  n_pages - 1, page);
2513                         page += PAGE_SIZE;
2514                 } while (page < end_addr);
2515         }
2516
2517         return n_pages;
2518 }
2519
2520 static int
2521 isert_fast_reg_mr(struct isert_conn *isert_conn,
2522                   struct fast_reg_descriptor *fr_desc,
2523                   struct isert_data_buf *mem,
2524                   enum isert_indicator ind,
2525                   struct ib_sge *sge)
2526 {
2527         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2528         struct ib_mr *mr;
2529         struct ib_fast_reg_page_list *frpl;
2530         struct ib_send_wr fr_wr, inv_wr;
2531         struct ib_send_wr *bad_wr, *wr = NULL;
2532         int ret, pagelist_len;
2533         u32 page_off;
2534         u8 key;
2535
2536         if (mem->dma_nents == 1) {
2537                 sge->lkey = isert_conn->conn_mr->lkey;
2538                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2539                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2540                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2541                          __func__, __LINE__, sge->addr, sge->length,
2542                          sge->lkey);
2543                 return 0;
2544         }
2545
2546         if (ind == ISERT_DATA_KEY_VALID) {
2547                 /* Registering data buffer */
2548                 mr = fr_desc->data_mr;
2549                 frpl = fr_desc->data_frpl;
2550         } else {
2551                 /* Registering protection buffer */
2552                 mr = fr_desc->pi_ctx->prot_mr;
2553                 frpl = fr_desc->pi_ctx->prot_frpl;
2554         }
2555
2556         page_off = mem->offset % PAGE_SIZE;
2557
2558         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2559                  fr_desc, mem->nents, mem->offset);
2560
2561         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2562                                              &frpl->page_list[0]);
2563
2564         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2565                 memset(&inv_wr, 0, sizeof(inv_wr));
2566                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2567                 inv_wr.opcode = IB_WR_LOCAL_INV;
2568                 inv_wr.ex.invalidate_rkey = mr->rkey;
2569                 wr = &inv_wr;
2570                 /* Bump the key */
2571                 key = (u8)(mr->rkey & 0x000000FF);
2572                 ib_update_fast_reg_key(mr, ++key);
2573         }
2574
2575         /* Prepare FASTREG WR */
2576         memset(&fr_wr, 0, sizeof(fr_wr));
2577         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2578         fr_wr.opcode = IB_WR_FAST_REG_MR;
2579         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2580         fr_wr.wr.fast_reg.page_list = frpl;
2581         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2582         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2583         fr_wr.wr.fast_reg.length = mem->len;
2584         fr_wr.wr.fast_reg.rkey = mr->rkey;
2585         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2586
2587         if (!wr)
2588                 wr = &fr_wr;
2589         else
2590                 wr->next = &fr_wr;
2591
2592         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2593         if (ret) {
2594                 pr_err("fast registration failed, ret:%d\n", ret);
2595                 return ret;
2596         }
2597         fr_desc->ind &= ~ind;
2598
2599         sge->lkey = mr->lkey;
2600         sge->addr = frpl->page_list[0] + page_off;
2601         sge->length = mem->len;
2602
2603         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2604                  __func__, __LINE__, sge->addr, sge->length,
2605                  sge->lkey);
2606
2607         return ret;
2608 }
2609
2610 static inline enum ib_t10_dif_type
2611 se2ib_prot_type(enum target_prot_type prot_type)
2612 {
2613         switch (prot_type) {
2614         case TARGET_DIF_TYPE0_PROT:
2615                 return IB_T10DIF_NONE;
2616         case TARGET_DIF_TYPE1_PROT:
2617                 return IB_T10DIF_TYPE1;
2618         case TARGET_DIF_TYPE2_PROT:
2619                 return IB_T10DIF_TYPE2;
2620         case TARGET_DIF_TYPE3_PROT:
2621                 return IB_T10DIF_TYPE3;
2622         default:
2623                 return IB_T10DIF_NONE;
2624         }
2625 }
2626
2627 static int
2628 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2629 {
2630         enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2631
2632         sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2633         sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2634         sig_attrs->mem.sig.dif.pi_interval =
2635                                 se_cmd->se_dev->dev_attrib.block_size;
2636         sig_attrs->wire.sig.dif.pi_interval =
2637                                 se_cmd->se_dev->dev_attrib.block_size;
2638
2639         switch (se_cmd->prot_op) {
2640         case TARGET_PROT_DIN_INSERT:
2641         case TARGET_PROT_DOUT_STRIP:
2642                 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2643                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2644                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2645                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2646                 break;
2647         case TARGET_PROT_DOUT_INSERT:
2648         case TARGET_PROT_DIN_STRIP:
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_T10DIF_NONE;
2653                 break;
2654         case TARGET_PROT_DIN_PASS:
2655         case TARGET_PROT_DOUT_PASS:
2656                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2657                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2658                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2659                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2660                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2661                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2662                 break;
2663         default:
2664                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2665                 return -EINVAL;
2666         }
2667
2668         return 0;
2669 }
2670
2671 static inline u8
2672 isert_set_prot_checks(u8 prot_checks)
2673 {
2674         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2675                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2676                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2677 }
2678
2679 static int
2680 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2681                  struct fast_reg_descriptor *fr_desc,
2682                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2683                  struct ib_sge *sig_sge)
2684 {
2685         struct ib_send_wr sig_wr, inv_wr;
2686         struct ib_send_wr *bad_wr, *wr = NULL;
2687         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2688         struct ib_sig_attrs sig_attrs;
2689         int ret;
2690         u32 key;
2691
2692         memset(&sig_attrs, 0, sizeof(sig_attrs));
2693         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2694         if (ret)
2695                 goto err;
2696
2697         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2698
2699         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2700                 memset(&inv_wr, 0, sizeof(inv_wr));
2701                 inv_wr.opcode = IB_WR_LOCAL_INV;
2702                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2703                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2704                 wr = &inv_wr;
2705                 /* Bump the key */
2706                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2707                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2708         }
2709
2710         memset(&sig_wr, 0, sizeof(sig_wr));
2711         sig_wr.opcode = IB_WR_REG_SIG_MR;
2712         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2713         sig_wr.sg_list = data_sge;
2714         sig_wr.num_sge = 1;
2715         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2716         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2717         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2718         if (se_cmd->t_prot_sg)
2719                 sig_wr.wr.sig_handover.prot = prot_sge;
2720
2721         if (!wr)
2722                 wr = &sig_wr;
2723         else
2724                 wr->next = &sig_wr;
2725
2726         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2727         if (ret) {
2728                 pr_err("fast registration failed, ret:%d\n", ret);
2729                 goto err;
2730         }
2731         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2732
2733         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2734         sig_sge->addr = 0;
2735         sig_sge->length = se_cmd->data_length;
2736         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2737             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2738                 /*
2739                  * We have protection guards on the wire
2740                  * so we need to set a larget transfer
2741                  */
2742                 sig_sge->length += se_cmd->prot_length;
2743
2744         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2745                  sig_sge->addr, sig_sge->length,
2746                  sig_sge->lkey);
2747 err:
2748         return ret;
2749 }
2750
2751 static int
2752 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2753                struct isert_rdma_wr *wr)
2754 {
2755         struct se_cmd *se_cmd = &cmd->se_cmd;
2756         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2757         struct isert_conn *isert_conn = conn->context;
2758         struct ib_sge data_sge;
2759         struct ib_send_wr *send_wr;
2760         struct fast_reg_descriptor *fr_desc = NULL;
2761         u32 offset;
2762         int ret = 0;
2763         unsigned long flags;
2764
2765         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2766
2767         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2768         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2769                                  se_cmd->t_data_nents, se_cmd->data_length,
2770                                  offset, wr->iser_ib_op, &wr->data);
2771         if (ret)
2772                 return ret;
2773
2774         if (wr->data.dma_nents != 1 ||
2775             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2776                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2777                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2778                                            struct fast_reg_descriptor, list);
2779                 list_del(&fr_desc->list);
2780                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2781                 wr->fr_desc = fr_desc;
2782         }
2783
2784         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2785                                 ISERT_DATA_KEY_VALID, &data_sge);
2786         if (ret)
2787                 goto unmap_cmd;
2788
2789         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2790                 struct ib_sge prot_sge, sig_sge;
2791
2792                 if (se_cmd->t_prot_sg) {
2793                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2794                                                  se_cmd->t_prot_sg,
2795                                                  se_cmd->t_prot_nents,
2796                                                  se_cmd->prot_length,
2797                                                  0, wr->iser_ib_op, &wr->prot);
2798                         if (ret)
2799                                 goto unmap_cmd;
2800
2801                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2802                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2803                         if (ret)
2804                                 goto unmap_prot_cmd;
2805                 }
2806
2807                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2808                                        &data_sge, &prot_sge, &sig_sge);
2809                 if (ret)
2810                         goto unmap_prot_cmd;
2811
2812                 fr_desc->ind |= ISERT_PROTECTED;
2813                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2814         } else
2815                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2816
2817         wr->ib_sge = &wr->s_ib_sge;
2818         wr->send_wr_num = 1;
2819         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2820         wr->send_wr = &wr->s_send_wr;
2821         wr->isert_cmd = isert_cmd;
2822
2823         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2824         send_wr->sg_list = &wr->s_ib_sge;
2825         send_wr->num_sge = 1;
2826         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2827         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2828                 send_wr->opcode = IB_WR_RDMA_WRITE;
2829                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2830                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2831                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2832                                       0 : IB_SEND_SIGNALED;
2833         } else {
2834                 send_wr->opcode = IB_WR_RDMA_READ;
2835                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2836                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2837                 send_wr->send_flags = IB_SEND_SIGNALED;
2838         }
2839
2840         return 0;
2841 unmap_prot_cmd:
2842         if (se_cmd->t_prot_sg)
2843                 isert_unmap_data_buf(isert_conn, &wr->prot);
2844 unmap_cmd:
2845         if (fr_desc) {
2846                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2847                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2848                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2849         }
2850         isert_unmap_data_buf(isert_conn, &wr->data);
2851
2852         return ret;
2853 }
2854
2855 static int
2856 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2857 {
2858         struct se_cmd *se_cmd = &cmd->se_cmd;
2859         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2860         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2861         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2862         struct isert_device *device = isert_conn->conn_device;
2863         struct ib_send_wr *wr_failed;
2864         int rc;
2865
2866         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2867                  isert_cmd, se_cmd->data_length);
2868         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2869         rc = device->reg_rdma_mem(conn, cmd, wr);
2870         if (rc) {
2871                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2872                 return rc;
2873         }
2874
2875         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2876                 /*
2877                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2878                  */
2879                 isert_create_send_desc(isert_conn, isert_cmd,
2880                                        &isert_cmd->tx_desc);
2881                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2882                                      &isert_cmd->tx_desc.iscsi_header);
2883                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2884                 isert_init_send_wr(isert_conn, isert_cmd,
2885                                    &isert_cmd->tx_desc.send_wr, true);
2886                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2887                 wr->send_wr_num += 1;
2888         }
2889
2890         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2891
2892         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2893         if (rc) {
2894                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2895                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2896         }
2897
2898         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2899                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2900                          "READ\n", isert_cmd);
2901         else
2902                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2903                          isert_cmd);
2904
2905         return 1;
2906 }
2907
2908 static int
2909 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2910 {
2911         struct se_cmd *se_cmd = &cmd->se_cmd;
2912         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2913         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2914         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2915         struct isert_device *device = isert_conn->conn_device;
2916         struct ib_send_wr *wr_failed;
2917         int rc;
2918
2919         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2920                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2921         wr->iser_ib_op = ISER_IB_RDMA_READ;
2922         rc = device->reg_rdma_mem(conn, cmd, wr);
2923         if (rc) {
2924                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2925                 return rc;
2926         }
2927
2928         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2929
2930         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2931         if (rc) {
2932                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2933                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2934         }
2935         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2936                  isert_cmd);
2937
2938         return 0;
2939 }
2940
2941 static int
2942 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2943 {
2944         int ret;
2945
2946         switch (state) {
2947         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2948                 ret = isert_put_nopin(cmd, conn, false);
2949                 break;
2950         default:
2951                 pr_err("Unknown immediate state: 0x%02x\n", state);
2952                 ret = -EINVAL;
2953                 break;
2954         }
2955
2956         return ret;
2957 }
2958
2959 static int
2960 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2961 {
2962         int ret;
2963
2964         switch (state) {
2965         case ISTATE_SEND_LOGOUTRSP:
2966                 ret = isert_put_logout_rsp(cmd, conn);
2967                 if (!ret) {
2968                         pr_debug("Returning iSER Logout -EAGAIN\n");
2969                         ret = -EAGAIN;
2970                 }
2971                 break;
2972         case ISTATE_SEND_NOPIN:
2973                 ret = isert_put_nopin(cmd, conn, true);
2974                 break;
2975         case ISTATE_SEND_TASKMGTRSP:
2976                 ret = isert_put_tm_rsp(cmd, conn);
2977                 break;
2978         case ISTATE_SEND_REJECT:
2979                 ret = isert_put_reject(cmd, conn);
2980                 break;
2981         case ISTATE_SEND_TEXTRSP:
2982                 ret = isert_put_text_rsp(cmd, conn);
2983                 break;
2984         case ISTATE_SEND_STATUS:
2985                 /*
2986                  * Special case for sending non GOOD SCSI status from TX thread
2987                  * context during pre se_cmd excecution failure.
2988                  */
2989                 ret = isert_put_response(conn, cmd);
2990                 break;
2991         default:
2992                 pr_err("Unknown response state: 0x%02x\n", state);
2993                 ret = -EINVAL;
2994                 break;
2995         }
2996
2997         return ret;
2998 }
2999
3000 static int
3001 isert_setup_np(struct iscsi_np *np,
3002                struct __kernel_sockaddr_storage *ksockaddr)
3003 {
3004         struct isert_np *isert_np;
3005         struct rdma_cm_id *isert_lid;
3006         struct sockaddr *sa;
3007         int ret;
3008
3009         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3010         if (!isert_np) {
3011                 pr_err("Unable to allocate struct isert_np\n");
3012                 return -ENOMEM;
3013         }
3014         sema_init(&isert_np->np_sem, 0);
3015         mutex_init(&isert_np->np_accept_mutex);
3016         INIT_LIST_HEAD(&isert_np->np_accept_list);
3017         init_completion(&isert_np->np_login_comp);
3018
3019         sa = (struct sockaddr *)ksockaddr;
3020         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3021         /*
3022          * Setup the np->np_sockaddr from the passed sockaddr setup
3023          * in iscsi_target_configfs.c code..
3024          */
3025         memcpy(&np->np_sockaddr, ksockaddr,
3026                sizeof(struct __kernel_sockaddr_storage));
3027
3028         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3029                                 IB_QPT_RC);
3030         if (IS_ERR(isert_lid)) {
3031                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3032                        PTR_ERR(isert_lid));
3033                 ret = PTR_ERR(isert_lid);
3034                 goto out;
3035         }
3036
3037         ret = rdma_bind_addr(isert_lid, sa);
3038         if (ret) {
3039                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3040                 goto out_lid;
3041         }
3042
3043         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3044         if (ret) {
3045                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3046                 goto out_lid;
3047         }
3048
3049         isert_np->np_cm_id = isert_lid;
3050         np->np_context = isert_np;
3051         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3052
3053         return 0;
3054
3055 out_lid:
3056         rdma_destroy_id(isert_lid);
3057 out:
3058         kfree(isert_np);
3059         return ret;
3060 }
3061
3062 static int
3063 isert_rdma_accept(struct isert_conn *isert_conn)
3064 {
3065         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3066         struct rdma_conn_param cp;
3067         int ret;
3068
3069         memset(&cp, 0, sizeof(struct rdma_conn_param));
3070         cp.responder_resources = isert_conn->responder_resources;
3071         cp.initiator_depth = isert_conn->initiator_depth;
3072         cp.retry_count = 7;
3073         cp.rnr_retry_count = 7;
3074
3075         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3076
3077         ret = rdma_accept(cm_id, &cp);
3078         if (ret) {
3079                 pr_err("rdma_accept() failed with: %d\n", ret);
3080                 return ret;
3081         }
3082
3083         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3084
3085         return 0;
3086 }
3087
3088 static int
3089 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3090 {
3091         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3092         int ret;
3093
3094         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3095         /*
3096          * For login requests after the first PDU, isert_rx_login_req() will
3097          * kick schedule_delayed_work(&conn->login_work) as the packet is
3098          * received, which turns this callback from iscsi_target_do_login_rx()
3099          * into a NOP.
3100          */
3101         if (!login->first_request)
3102                 return 0;
3103
3104         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3105         if (ret)
3106                 return ret;
3107
3108         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3109         return 0;
3110 }
3111
3112 static void
3113 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3114                     struct isert_conn *isert_conn)
3115 {
3116         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3117         struct rdma_route *cm_route = &cm_id->route;
3118         struct sockaddr_in *sock_in;
3119         struct sockaddr_in6 *sock_in6;
3120
3121         conn->login_family = np->np_sockaddr.ss_family;
3122
3123         if (np->np_sockaddr.ss_family == AF_INET6) {
3124                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3125                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3126                          &sock_in6->sin6_addr.in6_u);
3127                 conn->login_port = ntohs(sock_in6->sin6_port);
3128
3129                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3130                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3131                          &sock_in6->sin6_addr.in6_u);
3132                 conn->local_port = ntohs(sock_in6->sin6_port);
3133         } else {
3134                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3135                 sprintf(conn->login_ip, "%pI4",
3136                         &sock_in->sin_addr.s_addr);
3137                 conn->login_port = ntohs(sock_in->sin_port);
3138
3139                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3140                 sprintf(conn->local_ip, "%pI4",
3141                         &sock_in->sin_addr.s_addr);
3142                 conn->local_port = ntohs(sock_in->sin_port);
3143         }
3144 }
3145
3146 static int
3147 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3148 {
3149         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3150         struct isert_conn *isert_conn;
3151         int max_accept = 0, ret;
3152
3153 accept_wait:
3154         ret = down_interruptible(&isert_np->np_sem);
3155         if (max_accept > 5)
3156                 return -ENODEV;
3157
3158         spin_lock_bh(&np->np_thread_lock);
3159         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3160                 spin_unlock_bh(&np->np_thread_lock);
3161                 pr_debug("np_thread_state %d for isert_accept_np\n",
3162                          np->np_thread_state);
3163                 /**
3164                  * No point in stalling here when np_thread
3165                  * is in state RESET/SHUTDOWN/EXIT - bail
3166                  **/
3167                 return -ENODEV;
3168         }
3169         spin_unlock_bh(&np->np_thread_lock);
3170
3171         mutex_lock(&isert_np->np_accept_mutex);
3172         if (list_empty(&isert_np->np_accept_list)) {
3173                 mutex_unlock(&isert_np->np_accept_mutex);
3174                 max_accept++;
3175                 goto accept_wait;
3176         }
3177         isert_conn = list_first_entry(&isert_np->np_accept_list,
3178                         struct isert_conn, conn_accept_node);
3179         list_del_init(&isert_conn->conn_accept_node);
3180         mutex_unlock(&isert_np->np_accept_mutex);
3181
3182         conn->context = isert_conn;
3183         isert_conn->conn = conn;
3184         max_accept = 0;
3185
3186         ret = isert_rdma_post_recvl(isert_conn);
3187         if (ret)
3188                 return ret;
3189
3190         ret = isert_rdma_accept(isert_conn);
3191         if (ret)
3192                 return ret;
3193
3194         isert_set_conn_info(np, conn, isert_conn);
3195
3196         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3197         return 0;
3198 }
3199
3200 static void
3201 isert_free_np(struct iscsi_np *np)
3202 {
3203         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3204
3205         rdma_destroy_id(isert_np->np_cm_id);
3206
3207         np->np_context = NULL;
3208         kfree(isert_np);
3209 }
3210
3211 static void isert_wait_conn(struct iscsi_conn *conn)
3212 {
3213         struct isert_conn *isert_conn = conn->context;
3214
3215         pr_debug("isert_wait_conn: Starting \n");
3216
3217         mutex_lock(&isert_conn->conn_mutex);
3218         if (isert_conn->conn_cm_id) {
3219                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3220                 rdma_disconnect(isert_conn->conn_cm_id);
3221         }
3222         /*
3223          * Only wait for conn_wait_comp_err if the isert_conn made it
3224          * into full feature phase..
3225          */
3226         if (isert_conn->state == ISER_CONN_INIT) {
3227                 mutex_unlock(&isert_conn->conn_mutex);
3228                 return;
3229         }
3230         if (isert_conn->state == ISER_CONN_UP)
3231                 isert_conn->state = ISER_CONN_TERMINATING;
3232         mutex_unlock(&isert_conn->conn_mutex);
3233
3234         wait_for_completion(&isert_conn->conn_wait_comp_err);
3235
3236         wait_for_completion(&isert_conn->conn_wait);
3237 }
3238
3239 static void isert_free_conn(struct iscsi_conn *conn)
3240 {
3241         struct isert_conn *isert_conn = conn->context;
3242
3243         isert_put_conn(isert_conn);
3244 }
3245
3246 static struct iscsit_transport iser_target_transport = {
3247         .name                   = "IB/iSER",
3248         .transport_type         = ISCSI_INFINIBAND,
3249         .priv_size              = sizeof(struct isert_cmd),
3250         .owner                  = THIS_MODULE,
3251         .iscsit_setup_np        = isert_setup_np,
3252         .iscsit_accept_np       = isert_accept_np,
3253         .iscsit_free_np         = isert_free_np,
3254         .iscsit_wait_conn       = isert_wait_conn,
3255         .iscsit_free_conn       = isert_free_conn,
3256         .iscsit_get_login_rx    = isert_get_login_rx,
3257         .iscsit_put_login_tx    = isert_put_login_tx,
3258         .iscsit_immediate_queue = isert_immediate_queue,
3259         .iscsit_response_queue  = isert_response_queue,
3260         .iscsit_get_dataout     = isert_get_dataout,
3261         .iscsit_queue_data_in   = isert_put_datain,
3262         .iscsit_queue_status    = isert_put_response,
3263         .iscsit_aborted_task    = isert_aborted_task,
3264         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3265 };
3266
3267 static int __init isert_init(void)
3268 {
3269         int ret;
3270
3271         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3272         if (!isert_rx_wq) {
3273                 pr_err("Unable to allocate isert_rx_wq\n");
3274                 return -ENOMEM;
3275         }
3276
3277         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3278         if (!isert_comp_wq) {
3279                 pr_err("Unable to allocate isert_comp_wq\n");
3280                 ret = -ENOMEM;
3281                 goto destroy_rx_wq;
3282         }
3283
3284         iscsit_register_transport(&iser_target_transport);
3285         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3286         return 0;
3287
3288 destroy_rx_wq:
3289         destroy_workqueue(isert_rx_wq);
3290         return ret;
3291 }
3292
3293 static void __exit isert_exit(void)
3294 {
3295         flush_scheduled_work();
3296         destroy_workqueue(isert_comp_wq);
3297         destroy_workqueue(isert_rx_wq);
3298         iscsit_unregister_transport(&iser_target_transport);
3299         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3300 }
3301
3302 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3303 MODULE_VERSION("0.1");
3304 MODULE_AUTHOR("[email protected]");
3305 MODULE_LICENSE("GPL");
3306
3307 module_init(isert_init);
3308 module_exit(isert_exit);