drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static int
  56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  57
  58 static void
  59 isert_qp_event_callback(struct ib_event *e, void *context)
  60 {
  61         struct isert_conn *isert_conn = (struct isert_conn *)context;
  62
  63         pr_err("isert_qp_event_callback event: %d\n", e->event);
  64         switch (e->event) {
  65         case IB_EVENT_COMM_EST:
  66                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  67                 break;
  68         case IB_EVENT_QP_LAST_WQE_REACHED:
  69                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 static int
  77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  78 {
  79         int ret;
  80
  81         ret = ib_query_device(ib_dev, devattr);
  82         if (ret) {
  83                 pr_err("ib_query_device() failed: %d\n", ret);
  84                 return ret;
  85         }
  86         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  87         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  88
  89         return 0;
  90 }
  91
  92 static int
  93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  94                     u8 protection)
  95 {
  96         struct isert_device *device = isert_conn->conn_device;
  97         struct ib_qp_init_attr attr;
  98         int ret, index, min_index = 0;
  99
 100         mutex_lock(&device_list_mutex);
 101         for (index = 0; index < device->cqs_used; index++)
 102                 if (device->cq_active_qps[index] <
 103                     device->cq_active_qps[min_index])
 104                         min_index = index;
 105         device->cq_active_qps[min_index]++;
 106         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 107         mutex_unlock(&device_list_mutex);
 108
 109         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 110         attr.event_handler = isert_qp_event_callback;
 111         attr.qp_context = isert_conn;
 112         attr.send_cq = device->dev_tx_cq[min_index];
 113         attr.recv_cq = device->dev_rx_cq[min_index];
 114         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 115         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 116         /*
 117          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 118          * work-around for RDMA_READs with ConnectX-2.
 119          *
 120          * Also, still make sure to have at least two SGEs for
 121          * outgoing control PDU responses.
 122          */
 123         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 124         isert_conn->max_sge = attr.cap.max_send_sge;
 125
 126         attr.cap.max_recv_sge = 1;
 127         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 128         attr.qp_type = IB_QPT_RC;
 129         if (protection)
 130                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 131
 132         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 133                  cma_id->device);
 134         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 135                  isert_conn->conn_pd->device);
 136
 137         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 138         if (ret) {
 139                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 140                 return ret;
 141         }
 142         isert_conn->conn_qp = cma_id->qp;
 143         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 144
 145         return 0;
 146 }
 147
 148 static void
 149 isert_cq_event_callback(struct ib_event *e, void *context)
 150 {
 151         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 152 }
 153
 154 static int
 155 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 156 {
 157         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 158         struct iser_rx_desc *rx_desc;
 159         struct ib_sge *rx_sg;
 160         u64 dma_addr;
 161         int i, j;
 162
 163         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 164                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 165         if (!isert_conn->conn_rx_descs)
 166                 goto fail;
 167
 168         rx_desc = isert_conn->conn_rx_descs;
 169
 170         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 171                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 172                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 173                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 174                         goto dma_map_fail;
 175
 176                 rx_desc->dma_addr = dma_addr;
 177
 178                 rx_sg = &rx_desc->rx_sg;
 179                 rx_sg->addr = rx_desc->dma_addr;
 180                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 181                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 182         }
 183
 184         isert_conn->conn_rx_desc_head = 0;
 185         return 0;
 186
 187 dma_map_fail:
 188         rx_desc = isert_conn->conn_rx_descs;
 189         for (j = 0; j < i; j++, rx_desc++) {
 190                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 191                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 192         }
 193         kfree(isert_conn->conn_rx_descs);
 194         isert_conn->conn_rx_descs = NULL;
 195 fail:
 196         return -ENOMEM;
 197 }
 198
 199 static void
 200 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 201 {
 202         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 203         struct iser_rx_desc *rx_desc;
 204         int i;
 205
 206         if (!isert_conn->conn_rx_descs)
 207                 return;
 208
 209         rx_desc = isert_conn->conn_rx_descs;
 210         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 211                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 212                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 213         }
 214
 215         kfree(isert_conn->conn_rx_descs);
 216         isert_conn->conn_rx_descs = NULL;
 217 }
 218
 219 static void isert_cq_tx_work(struct work_struct *);
 220 static void isert_cq_tx_callback(struct ib_cq *, void *);
 221 static void isert_cq_rx_work(struct work_struct *);
 222 static void isert_cq_rx_callback(struct ib_cq *, void *);
 223
 224 static int
 225 isert_create_device_ib_res(struct isert_device *device)
 226 {
 227         struct ib_device *ib_dev = device->ib_device;
 228         struct isert_cq_desc *cq_desc;
 229         struct ib_device_attr *dev_attr;
 230         int ret = 0, i, j;
 231         int max_rx_cqe, max_tx_cqe;
 232
 233         dev_attr = &device->dev_attr;
 234         ret = isert_query_device(ib_dev, dev_attr);
 235         if (ret)
 236                 return ret;
 237
 238         max_rx_cqe = min(ISER_MAX_RX_CQ_LEN, dev_attr->max_cqe);
 239         max_tx_cqe = min(ISER_MAX_TX_CQ_LEN, dev_attr->max_cqe);
 240
 241         /* asign function handlers */
 242         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 243             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 244                 device->use_fastreg = 1;
 245                 device->reg_rdma_mem = isert_reg_rdma;
 246                 device->unreg_rdma_mem = isert_unreg_rdma;
 247         } else {
 248                 device->use_fastreg = 0;
 249                 device->reg_rdma_mem = isert_map_rdma;
 250                 device->unreg_rdma_mem = isert_unmap_cmd;
 251         }
 252
 253         /* Check signature cap */
 254         device->pi_capable = dev_attr->device_cap_flags &
 255                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 256
 257         device->cqs_used = min_t(int, num_online_cpus(),
 258                                  device->ib_device->num_comp_vectors);
 259         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 260         pr_debug("Using %d CQs, device %s supports %d vectors support "
 261                  "Fast registration %d pi_capable %d\n",
 262                  device->cqs_used, device->ib_device->name,
 263                  device->ib_device->num_comp_vectors, device->use_fastreg,
 264                  device->pi_capable);
 265         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 266                                 device->cqs_used, GFP_KERNEL);
 267         if (!device->cq_desc) {
 268                 pr_err("Unable to allocate device->cq_desc\n");
 269                 return -ENOMEM;
 270         }
 271         cq_desc = device->cq_desc;
 272
 273         for (i = 0; i < device->cqs_used; i++) {
 274                 cq_desc[i].device = device;
 275                 cq_desc[i].cq_index = i;
 276
 277                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 278                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 279                                                 isert_cq_rx_callback,
 280                                                 isert_cq_event_callback,
 281                                                 (void *)&cq_desc[i],
 282                                                 max_rx_cqe, i);
 283                 if (IS_ERR(device->dev_rx_cq[i])) {
 284                         ret = PTR_ERR(device->dev_rx_cq[i]);
 285                         device->dev_rx_cq[i] = NULL;
 286                         goto out_cq;
 287                 }
 288
 289                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 290                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 291                                                 isert_cq_tx_callback,
 292                                                 isert_cq_event_callback,
 293                                                 (void *)&cq_desc[i],
 294                                                 max_tx_cqe, i);
 295                 if (IS_ERR(device->dev_tx_cq[i])) {
 296                         ret = PTR_ERR(device->dev_tx_cq[i]);
 297                         device->dev_tx_cq[i] = NULL;
 298                         goto out_cq;
 299                 }
 300
 301                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 302                 if (ret)
 303                         goto out_cq;
 304
 305                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 306                 if (ret)
 307                         goto out_cq;
 308         }
 309
 310         return 0;
 311
 312 out_cq:
 313         for (j = 0; j < i; j++) {
 314                 cq_desc = &device->cq_desc[j];
 315
 316                 if (device->dev_rx_cq[j]) {
 317                         cancel_work_sync(&cq_desc->cq_rx_work);
 318                         ib_destroy_cq(device->dev_rx_cq[j]);
 319                 }
 320                 if (device->dev_tx_cq[j]) {
 321                         cancel_work_sync(&cq_desc->cq_tx_work);
 322                         ib_destroy_cq(device->dev_tx_cq[j]);
 323                 }
 324         }
 325         kfree(device->cq_desc);
 326
 327         return ret;
 328 }
 329
 330 static void
 331 isert_free_device_ib_res(struct isert_device *device)
 332 {
 333         struct isert_cq_desc *cq_desc;
 334         int i;
 335
 336         for (i = 0; i < device->cqs_used; i++) {
 337                 cq_desc = &device->cq_desc[i];
 338
 339                 cancel_work_sync(&cq_desc->cq_rx_work);
 340                 cancel_work_sync(&cq_desc->cq_tx_work);
 341                 ib_destroy_cq(device->dev_rx_cq[i]);
 342                 ib_destroy_cq(device->dev_tx_cq[i]);
 343                 device->dev_rx_cq[i] = NULL;
 344                 device->dev_tx_cq[i] = NULL;
 345         }
 346
 347         kfree(device->cq_desc);
 348 }
 349
 350 static void
 351 isert_device_try_release(struct isert_device *device)
 352 {
 353         mutex_lock(&device_list_mutex);
 354         device->refcount--;
 355         if (!device->refcount) {
 356                 isert_free_device_ib_res(device);
 357                 list_del(&device->dev_node);
 358                 kfree(device);
 359         }
 360         mutex_unlock(&device_list_mutex);
 361 }
 362
 363 static struct isert_device *
 364 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 365 {
 366         struct isert_device *device;
 367         int ret;
 368
 369         mutex_lock(&device_list_mutex);
 370         list_for_each_entry(device, &device_list, dev_node) {
 371                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 372                         device->refcount++;
 373                         mutex_unlock(&device_list_mutex);
 374                         return device;
 375                 }
 376         }
 377
 378         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 379         if (!device) {
 380                 mutex_unlock(&device_list_mutex);
 381                 return ERR_PTR(-ENOMEM);
 382         }
 383
 384         INIT_LIST_HEAD(&device->dev_node);
 385
 386         device->ib_device = cma_id->device;
 387         ret = isert_create_device_ib_res(device);
 388         if (ret) {
 389                 kfree(device);
 390                 mutex_unlock(&device_list_mutex);
 391                 return ERR_PTR(ret);
 392         }
 393
 394         device->refcount++;
 395         list_add_tail(&device->dev_node, &device_list);
 396         mutex_unlock(&device_list_mutex);
 397
 398         return device;
 399 }
 400
 401 static void
 402 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 403 {
 404         struct fast_reg_descriptor *fr_desc, *tmp;
 405         int i = 0;
 406
 407         if (list_empty(&isert_conn->conn_fr_pool))
 408                 return;
 409
 410         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 411
 412         list_for_each_entry_safe(fr_desc, tmp,
 413                                  &isert_conn->conn_fr_pool, list) {
 414                 list_del(&fr_desc->list);
 415                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 416                 ib_dereg_mr(fr_desc->data_mr);
 417                 if (fr_desc->pi_ctx) {
 418                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 419                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 420                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 421                         kfree(fr_desc->pi_ctx);
 422                 }
 423                 kfree(fr_desc);
 424                 ++i;
 425         }
 426
 427         if (i < isert_conn->conn_fr_pool_size)
 428                 pr_warn("Pool still has %d regions registered\n",
 429                         isert_conn->conn_fr_pool_size - i);
 430 }
 431
 432 static int
 433 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 434                      struct fast_reg_descriptor *fr_desc, u8 protection)
 435 {
 436         int ret;
 437
 438         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 439                                                          ISCSI_ISER_SG_TABLESIZE);
 440         if (IS_ERR(fr_desc->data_frpl)) {
 441                 pr_err("Failed to allocate data frpl err=%ld\n",
 442                        PTR_ERR(fr_desc->data_frpl));
 443                 return PTR_ERR(fr_desc->data_frpl);
 444         }
 445
 446         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 447         if (IS_ERR(fr_desc->data_mr)) {
 448                 pr_err("Failed to allocate data frmr err=%ld\n",
 449                        PTR_ERR(fr_desc->data_mr));
 450                 ret = PTR_ERR(fr_desc->data_mr);
 451                 goto err_data_frpl;
 452         }
 453         pr_debug("Create fr_desc %p page_list %p\n",
 454                  fr_desc, fr_desc->data_frpl->page_list);
 455         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 456
 457         if (protection) {
 458                 struct ib_mr_init_attr mr_init_attr = {0};
 459                 struct pi_context *pi_ctx;
 460
 461                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 462                 if (!fr_desc->pi_ctx) {
 463                         pr_err("Failed to allocate pi context\n");
 464                         ret = -ENOMEM;
 465                         goto err_data_mr;
 466                 }
 467                 pi_ctx = fr_desc->pi_ctx;
 468
 469                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 470                                                     ISCSI_ISER_SG_TABLESIZE);
 471                 if (IS_ERR(pi_ctx->prot_frpl)) {
 472                         pr_err("Failed to allocate prot frpl err=%ld\n",
 473                                PTR_ERR(pi_ctx->prot_frpl));
 474                         ret = PTR_ERR(pi_ctx->prot_frpl);
 475                         goto err_pi_ctx;
 476                 }
 477
 478                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 479                 if (IS_ERR(pi_ctx->prot_mr)) {
 480                         pr_err("Failed to allocate prot frmr err=%ld\n",
 481                                PTR_ERR(pi_ctx->prot_mr));
 482                         ret = PTR_ERR(pi_ctx->prot_mr);
 483                         goto err_prot_frpl;
 484                 }
 485                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 486
 487                 mr_init_attr.max_reg_descriptors = 2;
 488                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 489                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 490                 if (IS_ERR(pi_ctx->sig_mr)) {
 491                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 492                                PTR_ERR(pi_ctx->sig_mr));
 493                         ret = PTR_ERR(pi_ctx->sig_mr);
 494                         goto err_prot_mr;
 495                 }
 496                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 497         }
 498         fr_desc->ind &= ~ISERT_PROTECTED;
 499
 500         return 0;
 501 err_prot_mr:
 502         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 503 err_prot_frpl:
 504         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 505 err_pi_ctx:
 506         kfree(fr_desc->pi_ctx);
 507 err_data_mr:
 508         ib_dereg_mr(fr_desc->data_mr);
 509 err_data_frpl:
 510         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 511
 512         return ret;
 513 }
 514
 515 static int
 516 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 517 {
 518         struct fast_reg_descriptor *fr_desc;
 519         struct isert_device *device = isert_conn->conn_device;
 520         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 521         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 522         int i, ret, tag_num;
 523         /*
 524          * Setup the number of FRMRs based upon the number of tags
 525          * available to session in iscsi_target_locate_portal().
 526          */
 527         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 528         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 529
 530         isert_conn->conn_fr_pool_size = 0;
 531         for (i = 0; i < tag_num; i++) {
 532                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 533                 if (!fr_desc) {
 534                         pr_err("Failed to allocate fast_reg descriptor\n");
 535                         ret = -ENOMEM;
 536                         goto err;
 537                 }
 538
 539                 ret = isert_create_fr_desc(device->ib_device,
 540                                            isert_conn->conn_pd, fr_desc,
 541                                            pi_support);
 542                 if (ret) {
 543                         pr_err("Failed to create fastreg descriptor err=%d\n",
 544                                ret);
 545                         kfree(fr_desc);
 546                         goto err;
 547                 }
 548
 549                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 550                 isert_conn->conn_fr_pool_size++;
 551         }
 552
 553         pr_debug("Creating conn %p fastreg pool size=%d",
 554                  isert_conn, isert_conn->conn_fr_pool_size);
 555
 556         return 0;
 557
 558 err:
 559         isert_conn_free_fastreg_pool(isert_conn);
 560         return ret;
 561 }
 562
 563 static int
 564 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 565 {
 566         struct iscsi_np *np = cma_id->context;
 567         struct isert_np *isert_np = np->np_context;
 568         struct isert_conn *isert_conn;
 569         struct isert_device *device;
 570         struct ib_device *ib_dev = cma_id->device;
 571         int ret = 0;
 572         u8 pi_support;
 573
 574         spin_lock_bh(&np->np_thread_lock);
 575         if (!np->enabled) {
 576                 spin_unlock_bh(&np->np_thread_lock);
 577                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 578                 return rdma_reject(cma_id, NULL, 0);
 579         }
 580         spin_unlock_bh(&np->np_thread_lock);
 581
 582         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 583                  cma_id, cma_id->context);
 584
 585         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 586         if (!isert_conn) {
 587                 pr_err("Unable to allocate isert_conn\n");
 588                 return -ENOMEM;
 589         }
 590         isert_conn->state = ISER_CONN_INIT;
 591         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 592         init_completion(&isert_conn->conn_login_comp);
 593         init_completion(&isert_conn->conn_wait);
 594         init_completion(&isert_conn->conn_wait_comp_err);
 595         kref_init(&isert_conn->conn_kref);
 596         mutex_init(&isert_conn->conn_mutex);
 597         spin_lock_init(&isert_conn->conn_lock);
 598         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 599
 600         cma_id->context = isert_conn;
 601         isert_conn->conn_cm_id = cma_id;
 602
 603         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 604                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 605         if (!isert_conn->login_buf) {
 606                 pr_err("Unable to allocate isert_conn->login_buf\n");
 607                 ret = -ENOMEM;
 608                 goto out;
 609         }
 610
 611         isert_conn->login_req_buf = isert_conn->login_buf;
 612         isert_conn->login_rsp_buf = isert_conn->login_buf +
 613                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 614         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 615                  isert_conn->login_buf, isert_conn->login_req_buf,
 616                  isert_conn->login_rsp_buf);
 617
 618         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 619                                 (void *)isert_conn->login_req_buf,
 620                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 621
 622         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 623         if (ret) {
 624                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 625                        ret);
 626                 isert_conn->login_req_dma = 0;
 627                 goto out_login_buf;
 628         }
 629
 630         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 631                                         (void *)isert_conn->login_rsp_buf,
 632                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 633
 634         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 635         if (ret) {
 636                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 637                        ret);
 638                 isert_conn->login_rsp_dma = 0;
 639                 goto out_req_dma_map;
 640         }
 641
 642         device = isert_device_find_by_ib_dev(cma_id);
 643         if (IS_ERR(device)) {
 644                 ret = PTR_ERR(device);
 645                 goto out_rsp_dma_map;
 646         }
 647
 648         /* Set max inflight RDMA READ requests */
 649         isert_conn->initiator_depth = min_t(u8,
 650                                 event->param.conn.initiator_depth,
 651                                 device->dev_attr.max_qp_init_rd_atom);
 652         pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 653
 654         isert_conn->conn_device = device;
 655         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 656         if (IS_ERR(isert_conn->conn_pd)) {
 657                 ret = PTR_ERR(isert_conn->conn_pd);
 658                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 659                        isert_conn, ret);
 660                 goto out_pd;
 661         }
 662
 663         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 664                                            IB_ACCESS_LOCAL_WRITE);
 665         if (IS_ERR(isert_conn->conn_mr)) {
 666                 ret = PTR_ERR(isert_conn->conn_mr);
 667                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 668                        isert_conn, ret);
 669                 goto out_mr;
 670         }
 671
 672         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 673         if (pi_support && !device->pi_capable) {
 674                 pr_err("Protection information requested but not supported, "
 675                        "rejecting connect request\n");
 676                 ret = rdma_reject(cma_id, NULL, 0);
 677                 goto out_mr;
 678         }
 679
 680         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 681         if (ret)
 682                 goto out_conn_dev;
 683
 684         mutex_lock(&isert_np->np_accept_mutex);
 685         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 686         mutex_unlock(&isert_np->np_accept_mutex);
 687
 688         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 689         up(&isert_np->np_sem);
 690         return 0;
 691
 692 out_conn_dev:
 693         ib_dereg_mr(isert_conn->conn_mr);
 694 out_mr:
 695         ib_dealloc_pd(isert_conn->conn_pd);
 696 out_pd:
 697         isert_device_try_release(device);
 698 out_rsp_dma_map:
 699         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 700                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 701 out_req_dma_map:
 702         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 703                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 704 out_login_buf:
 705         kfree(isert_conn->login_buf);
 706 out:
 707         kfree(isert_conn);
 708         return ret;
 709 }
 710
 711 static void
 712 isert_connect_release(struct isert_conn *isert_conn)
 713 {
 714         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 715         struct isert_device *device = isert_conn->conn_device;
 716         int cq_index;
 717
 718         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 719
 720         if (device && device->use_fastreg)
 721                 isert_conn_free_fastreg_pool(isert_conn);
 722
 723         if (isert_conn->conn_qp) {
 724                 cq_index = ((struct isert_cq_desc *)
 725                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 726                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 727                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 728
 729                 rdma_destroy_qp(isert_conn->conn_cm_id);
 730         }
 731
 732         isert_free_rx_descriptors(isert_conn);
 733         rdma_destroy_id(isert_conn->conn_cm_id);
 734
 735         ib_dereg_mr(isert_conn->conn_mr);
 736         ib_dealloc_pd(isert_conn->conn_pd);
 737
 738         if (isert_conn->login_buf) {
 739                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 740                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 741                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 742                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 743                                     DMA_FROM_DEVICE);
 744                 kfree(isert_conn->login_buf);
 745         }
 746         kfree(isert_conn);
 747
 748         if (device)
 749                 isert_device_try_release(device);
 750
 751         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 752 }
 753
 754 static void
 755 isert_connected_handler(struct rdma_cm_id *cma_id)
 756 {
 757         struct isert_conn *isert_conn = cma_id->context;
 758
 759         kref_get(&isert_conn->conn_kref);
 760 }
 761
 762 static void
 763 isert_release_conn_kref(struct kref *kref)
 764 {
 765         struct isert_conn *isert_conn = container_of(kref,
 766                                 struct isert_conn, conn_kref);
 767
 768         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 769                  current->comm, current->pid);
 770
 771         isert_connect_release(isert_conn);
 772 }
 773
 774 static void
 775 isert_put_conn(struct isert_conn *isert_conn)
 776 {
 777         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 778 }
 779
 780 static void
 781 isert_disconnect_work(struct work_struct *work)
 782 {
 783         struct isert_conn *isert_conn = container_of(work,
 784                                 struct isert_conn, conn_logout_work);
 785
 786         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 787         mutex_lock(&isert_conn->conn_mutex);
 788         if (isert_conn->state == ISER_CONN_UP)
 789                 isert_conn->state = ISER_CONN_TERMINATING;
 790
 791         if (isert_conn->post_recv_buf_count == 0 &&
 792             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 793                 mutex_unlock(&isert_conn->conn_mutex);
 794                 goto wake_up;
 795         }
 796         if (!isert_conn->conn_cm_id) {
 797                 mutex_unlock(&isert_conn->conn_mutex);
 798                 isert_put_conn(isert_conn);
 799                 return;
 800         }
 801
 802         if (isert_conn->disconnect) {
 803                 /* Send DREQ/DREP towards our initiator */
 804                 rdma_disconnect(isert_conn->conn_cm_id);
 805         }
 806
 807         mutex_unlock(&isert_conn->conn_mutex);
 808
 809 wake_up:
 810         complete(&isert_conn->conn_wait);
 811 }
 812
 813 static int
 814 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
 815 {
 816         struct isert_conn *isert_conn;
 817
 818         if (!cma_id->qp) {
 819                 struct isert_np *isert_np = cma_id->context;
 820
 821                 isert_np->np_cm_id = NULL;
 822                 return -1;
 823         }
 824
 825         isert_conn = (struct isert_conn *)cma_id->context;
 826
 827         isert_conn->disconnect = disconnect;
 828         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 829         schedule_work(&isert_conn->conn_logout_work);
 830
 831         return 0;
 832 }
 833
 834 static int
 835 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 836 {
 837         int ret = 0;
 838         bool disconnect = false;
 839
 840         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 841                  event->event, event->status, cma_id->context, cma_id);
 842
 843         switch (event->event) {
 844         case RDMA_CM_EVENT_CONNECT_REQUEST:
 845                 ret = isert_connect_request(cma_id, event);
 846                 if (ret)
 847                         pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 848                                 event->event, ret);
 849                 break;
 850         case RDMA_CM_EVENT_ESTABLISHED:
 851                 isert_connected_handler(cma_id);
 852                 break;
 853         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 854         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 855         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 856                 disconnect = true;
 857         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 858                 ret = isert_disconnected_handler(cma_id, disconnect);
 859                 break;
 860         case RDMA_CM_EVENT_CONNECT_ERROR:
 861         default:
 862                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 863                 break;
 864         }
 865
 866         return ret;
 867 }
 868
 869 static int
 870 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 871 {
 872         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 873         int i, ret;
 874         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 875         struct iser_rx_desc *rx_desc;
 876
 877         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 878                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 879                 rx_wr->wr_id    = (unsigned long)rx_desc;
 880                 rx_wr->sg_list  = &rx_desc->rx_sg;
 881                 rx_wr->num_sge  = 1;
 882                 rx_wr->next     = rx_wr + 1;
 883                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 884         }
 885
 886         rx_wr--;
 887         rx_wr->next = NULL; /* mark end of work requests list */
 888
 889         isert_conn->post_recv_buf_count += count;
 890         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 891                                 &rx_wr_failed);
 892         if (ret) {
 893                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 894                 isert_conn->post_recv_buf_count -= count;
 895         } else {
 896                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 897                 isert_conn->conn_rx_desc_head = rx_head;
 898         }
 899         return ret;
 900 }
 901
 902 static int
 903 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 904 {
 905         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 906         struct ib_send_wr send_wr, *send_wr_failed;
 907         int ret;
 908
 909         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 910                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 911
 912         send_wr.next    = NULL;
 913         send_wr.wr_id   = (unsigned long)tx_desc;
 914         send_wr.sg_list = tx_desc->tx_sg;
 915         send_wr.num_sge = tx_desc->num_sge;
 916         send_wr.opcode  = IB_WR_SEND;
 917         send_wr.send_flags = IB_SEND_SIGNALED;
 918
 919         atomic_inc(&isert_conn->post_send_buf_count);
 920
 921         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 922         if (ret) {
 923                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 924                 atomic_dec(&isert_conn->post_send_buf_count);
 925         }
 926
 927         return ret;
 928 }
 929
 930 static void
 931 isert_create_send_desc(struct isert_conn *isert_conn,
 932                        struct isert_cmd *isert_cmd,
 933                        struct iser_tx_desc *tx_desc)
 934 {
 935         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 936
 937         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 938                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 939
 940         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 941         tx_desc->iser_header.flags = ISER_VER;
 942
 943         tx_desc->num_sge = 1;
 944         tx_desc->isert_cmd = isert_cmd;
 945
 946         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 947                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 948                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 949         }
 950 }
 951
 952 static int
 953 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 954                    struct iser_tx_desc *tx_desc)
 955 {
 956         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 957         u64 dma_addr;
 958
 959         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 960                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 961         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 962                 pr_err("ib_dma_mapping_error() failed\n");
 963                 return -ENOMEM;
 964         }
 965
 966         tx_desc->dma_addr = dma_addr;
 967         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 968         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 969         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 970
 971         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 972                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 973                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 974
 975         return 0;
 976 }
 977
 978 static void
 979 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 980                    struct ib_send_wr *send_wr, bool coalesce)
 981 {
 982         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 983
 984         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 985         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 986         send_wr->opcode = IB_WR_SEND;
 987         send_wr->sg_list = &tx_desc->tx_sg[0];
 988         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 989         /*
 990          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 991          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 992          */
 993         mutex_lock(&isert_conn->conn_mutex);
 994         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 995             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 996                 tx_desc->llnode_active = true;
 997                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 998                 mutex_unlock(&isert_conn->conn_mutex);
 999                 return;
1000         }
1001         isert_conn->conn_comp_batch = 0;
1002         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
1003         mutex_unlock(&isert_conn->conn_mutex);
1004
1005         send_wr->send_flags = IB_SEND_SIGNALED;
1006 }
1007
1008 static int
1009 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1010 {
1011         struct ib_recv_wr rx_wr, *rx_wr_fail;
1012         struct ib_sge sge;
1013         int ret;
1014
1015         memset(&sge, 0, sizeof(struct ib_sge));
1016         sge.addr = isert_conn->login_req_dma;
1017         sge.length = ISER_RX_LOGIN_SIZE;
1018         sge.lkey = isert_conn->conn_mr->lkey;
1019
1020         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1021                 sge.addr, sge.length, sge.lkey);
1022
1023         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1024         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1025         rx_wr.sg_list = &sge;
1026         rx_wr.num_sge = 1;
1027
1028         isert_conn->post_recv_buf_count++;
1029         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1030         if (ret) {
1031                 pr_err("ib_post_recv() failed: %d\n", ret);
1032                 isert_conn->post_recv_buf_count--;
1033         }
1034
1035         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1036         return ret;
1037 }
1038
1039 static int
1040 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1041                    u32 length)
1042 {
1043         struct isert_conn *isert_conn = conn->context;
1044         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1045         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1046         int ret;
1047
1048         isert_create_send_desc(isert_conn, NULL, tx_desc);
1049
1050         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1051                sizeof(struct iscsi_hdr));
1052
1053         isert_init_tx_hdrs(isert_conn, tx_desc);
1054
1055         if (length > 0) {
1056                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1057
1058                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1059                                            length, DMA_TO_DEVICE);
1060
1061                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1062
1063                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1064                                               length, DMA_TO_DEVICE);
1065
1066                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1067                 tx_dsg->length  = length;
1068                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1069                 tx_desc->num_sge = 2;
1070         }
1071         if (!login->login_failed) {
1072                 if (login->login_complete) {
1073                         if (!conn->sess->sess_ops->SessionType &&
1074                             isert_conn->conn_device->use_fastreg) {
1075                                 /* Normal Session and fastreg is used */
1076                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1077
1078                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1079                                                                      pi_support);
1080                                 if (ret) {
1081                                         pr_err("Conn: %p failed to create"
1082                                                " fastreg pool\n", isert_conn);
1083                                         return ret;
1084                                 }
1085                         }
1086
1087                         ret = isert_alloc_rx_descriptors(isert_conn);
1088                         if (ret)
1089                                 return ret;
1090
1091                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1092                         if (ret)
1093                                 return ret;
1094
1095                         isert_conn->state = ISER_CONN_UP;
1096                         goto post_send;
1097                 }
1098
1099                 ret = isert_rdma_post_recvl(isert_conn);
1100                 if (ret)
1101                         return ret;
1102         }
1103 post_send:
1104         ret = isert_post_send(isert_conn, tx_desc);
1105         if (ret)
1106                 return ret;
1107
1108         return 0;
1109 }
1110
1111 static void
1112 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1113                    struct isert_conn *isert_conn)
1114 {
1115         struct iscsi_conn *conn = isert_conn->conn;
1116         struct iscsi_login *login = conn->conn_login;
1117         int size;
1118
1119         if (!login) {
1120                 pr_err("conn->conn_login is NULL\n");
1121                 dump_stack();
1122                 return;
1123         }
1124
1125         if (login->first_request) {
1126                 struct iscsi_login_req *login_req =
1127                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1128                 /*
1129                  * Setup the initial iscsi_login values from the leading
1130                  * login request PDU.
1131                  */
1132                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1133                 login->current_stage =
1134                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1135                          >> 2;
1136                 login->version_min      = login_req->min_version;
1137                 login->version_max      = login_req->max_version;
1138                 memcpy(login->isid, login_req->isid, 6);
1139                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1140                 login->init_task_tag    = login_req->itt;
1141                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1142                 login->cid              = be16_to_cpu(login_req->cid);
1143                 login->tsih             = be16_to_cpu(login_req->tsih);
1144         }
1145
1146         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1147
1148         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1149         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1150                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1151         memcpy(login->req_buf, &rx_desc->data[0], size);
1152
1153         if (login->first_request) {
1154                 complete(&isert_conn->conn_login_comp);
1155                 return;
1156         }
1157         schedule_delayed_work(&conn->login_work, 0);
1158 }
1159
1160 static struct iscsi_cmd
1161 *isert_allocate_cmd(struct iscsi_conn *conn)
1162 {
1163         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1164         struct isert_cmd *isert_cmd;
1165         struct iscsi_cmd *cmd;
1166
1167         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1168         if (!cmd) {
1169                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1170                 return NULL;
1171         }
1172         isert_cmd = iscsit_priv_cmd(cmd);
1173         isert_cmd->conn = isert_conn;
1174         isert_cmd->iscsi_cmd = cmd;
1175
1176         return cmd;
1177 }
1178
1179 static int
1180 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1181                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1182                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1183 {
1184         struct iscsi_conn *conn = isert_conn->conn;
1185         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1186         struct scatterlist *sg;
1187         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1188         bool dump_payload = false;
1189
1190         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1191         if (rc < 0)
1192                 return rc;
1193
1194         imm_data = cmd->immediate_data;
1195         imm_data_len = cmd->first_burst_len;
1196         unsol_data = cmd->unsolicited_data;
1197
1198         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1199         if (rc < 0) {
1200                 return 0;
1201         } else if (rc > 0) {
1202                 dump_payload = true;
1203                 goto sequence_cmd;
1204         }
1205
1206         if (!imm_data)
1207                 return 0;
1208
1209         sg = &cmd->se_cmd.t_data_sg[0];
1210         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1211
1212         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1213                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1214
1215         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1216
1217         cmd->write_data_done += imm_data_len;
1218
1219         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1220                 spin_lock_bh(&cmd->istate_lock);
1221                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1222                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1223                 spin_unlock_bh(&cmd->istate_lock);
1224         }
1225
1226 sequence_cmd:
1227         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1228
1229         if (!rc && dump_payload == false && unsol_data)
1230                 iscsit_set_unsoliticed_dataout(cmd);
1231         else if (dump_payload && imm_data)
1232                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1233
1234         return 0;
1235 }
1236
1237 static int
1238 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1239                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1240 {
1241         struct scatterlist *sg_start;
1242         struct iscsi_conn *conn = isert_conn->conn;
1243         struct iscsi_cmd *cmd = NULL;
1244         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1245         u32 unsol_data_len = ntoh24(hdr->dlength);
1246         int rc, sg_nents, sg_off, page_off;
1247
1248         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1249         if (rc < 0)
1250                 return rc;
1251         else if (!cmd)
1252                 return 0;
1253         /*
1254          * FIXME: Unexpected unsolicited_data out
1255          */
1256         if (!cmd->unsolicited_data) {
1257                 pr_err("Received unexpected solicited data payload\n");
1258                 dump_stack();
1259                 return -1;
1260         }
1261
1262         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1263                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1264
1265         sg_off = cmd->write_data_done / PAGE_SIZE;
1266         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1267         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1268         page_off = cmd->write_data_done % PAGE_SIZE;
1269         /*
1270          * FIXME: Non page-aligned unsolicited_data out
1271          */
1272         if (page_off) {
1273                 pr_err("Received unexpected non-page aligned data payload\n");
1274                 dump_stack();
1275                 return -1;
1276         }
1277         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1278                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1279
1280         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1281                             unsol_data_len);
1282
1283         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1284         if (rc < 0)
1285                 return rc;
1286
1287         return 0;
1288 }
1289
1290 static int
1291 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1292                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1293                      unsigned char *buf)
1294 {
1295         struct iscsi_conn *conn = isert_conn->conn;
1296         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1297         int rc;
1298
1299         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1300         if (rc < 0)
1301                 return rc;
1302         /*
1303          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1304          */
1305
1306         return iscsit_process_nop_out(conn, cmd, hdr);
1307 }
1308
1309 static int
1310 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1311                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1312                       struct iscsi_text *hdr)
1313 {
1314         struct iscsi_conn *conn = isert_conn->conn;
1315         u32 payload_length = ntoh24(hdr->dlength);
1316         int rc;
1317         unsigned char *text_in;
1318
1319         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1320         if (rc < 0)
1321                 return rc;
1322
1323         text_in = kzalloc(payload_length, GFP_KERNEL);
1324         if (!text_in) {
1325                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1326                        payload_length);
1327                 return -ENOMEM;
1328         }
1329         cmd->text_in_ptr = text_in;
1330
1331         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1332
1333         return iscsit_process_text_cmd(conn, cmd, hdr);
1334 }
1335
1336 static int
1337 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1338                 uint32_t read_stag, uint64_t read_va,
1339                 uint32_t write_stag, uint64_t write_va)
1340 {
1341         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1342         struct iscsi_conn *conn = isert_conn->conn;
1343         struct iscsi_session *sess = conn->sess;
1344         struct iscsi_cmd *cmd;
1345         struct isert_cmd *isert_cmd;
1346         int ret = -EINVAL;
1347         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1348
1349         if (sess->sess_ops->SessionType &&
1350            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1351                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1352                        " ignoring\n", opcode);
1353                 return 0;
1354         }
1355
1356         switch (opcode) {
1357         case ISCSI_OP_SCSI_CMD:
1358                 cmd = isert_allocate_cmd(conn);
1359                 if (!cmd)
1360                         break;
1361
1362                 isert_cmd = iscsit_priv_cmd(cmd);
1363                 isert_cmd->read_stag = read_stag;
1364                 isert_cmd->read_va = read_va;
1365                 isert_cmd->write_stag = write_stag;
1366                 isert_cmd->write_va = write_va;
1367
1368                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1369                                         rx_desc, (unsigned char *)hdr);
1370                 break;
1371         case ISCSI_OP_NOOP_OUT:
1372                 cmd = isert_allocate_cmd(conn);
1373                 if (!cmd)
1374                         break;
1375
1376                 isert_cmd = iscsit_priv_cmd(cmd);
1377                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1378                                            rx_desc, (unsigned char *)hdr);
1379                 break;
1380         case ISCSI_OP_SCSI_DATA_OUT:
1381                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1382                                                 (unsigned char *)hdr);
1383                 break;
1384         case ISCSI_OP_SCSI_TMFUNC:
1385                 cmd = isert_allocate_cmd(conn);
1386                 if (!cmd)
1387                         break;
1388
1389                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1390                                                 (unsigned char *)hdr);
1391                 break;
1392         case ISCSI_OP_LOGOUT:
1393                 cmd = isert_allocate_cmd(conn);
1394                 if (!cmd)
1395                         break;
1396
1397                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1398                 if (ret > 0)
1399                         wait_for_completion_timeout(&conn->conn_logout_comp,
1400                                                     SECONDS_FOR_LOGOUT_COMP *
1401                                                     HZ);
1402                 break;
1403         case ISCSI_OP_TEXT:
1404                 cmd = isert_allocate_cmd(conn);
1405                 if (!cmd)
1406                         break;
1407
1408                 isert_cmd = iscsit_priv_cmd(cmd);
1409                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1410                                             rx_desc, (struct iscsi_text *)hdr);
1411                 break;
1412         default:
1413                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1414                 dump_stack();
1415                 break;
1416         }
1417
1418         return ret;
1419 }
1420
1421 static void
1422 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1423 {
1424         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1425         uint64_t read_va = 0, write_va = 0;
1426         uint32_t read_stag = 0, write_stag = 0;
1427         int rc;
1428
1429         switch (iser_hdr->flags & 0xF0) {
1430         case ISCSI_CTRL:
1431                 if (iser_hdr->flags & ISER_RSV) {
1432                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1433                         read_va = be64_to_cpu(iser_hdr->read_va);
1434                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1435                                  read_stag, (unsigned long long)read_va);
1436                 }
1437                 if (iser_hdr->flags & ISER_WSV) {
1438                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1439                         write_va = be64_to_cpu(iser_hdr->write_va);
1440                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1441                                  write_stag, (unsigned long long)write_va);
1442                 }
1443
1444                 pr_debug("ISER ISCSI_CTRL PDU\n");
1445                 break;
1446         case ISER_HELLO:
1447                 pr_err("iSER Hello message\n");
1448                 break;
1449         default:
1450                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1451                 break;
1452         }
1453
1454         rc = isert_rx_opcode(isert_conn, rx_desc,
1455                              read_stag, read_va, write_stag, write_va);
1456 }
1457
1458 static void
1459 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1460                     unsigned long xfer_len)
1461 {
1462         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1463         struct iscsi_hdr *hdr;
1464         u64 rx_dma;
1465         int rx_buflen, outstanding;
1466
1467         if ((char *)desc == isert_conn->login_req_buf) {
1468                 rx_dma = isert_conn->login_req_dma;
1469                 rx_buflen = ISER_RX_LOGIN_SIZE;
1470                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1471                          rx_dma, rx_buflen);
1472         } else {
1473                 rx_dma = desc->dma_addr;
1474                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1475                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1476                          rx_dma, rx_buflen);
1477         }
1478
1479         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1480
1481         hdr = &desc->iscsi_header;
1482         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1483                  hdr->opcode, hdr->itt, hdr->flags,
1484                  (int)(xfer_len - ISER_HEADERS_LEN));
1485
1486         if ((char *)desc == isert_conn->login_req_buf)
1487                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1488                                    isert_conn);
1489         else
1490                 isert_rx_do_work(desc, isert_conn);
1491
1492         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1493                                       DMA_FROM_DEVICE);
1494
1495         isert_conn->post_recv_buf_count--;
1496         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1497                  isert_conn->post_recv_buf_count);
1498
1499         if ((char *)desc == isert_conn->login_req_buf)
1500                 return;
1501
1502         outstanding = isert_conn->post_recv_buf_count;
1503         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1504                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1505                                 ISERT_MIN_POSTED_RX);
1506                 err = isert_post_recv(isert_conn, count);
1507                 if (err) {
1508                         pr_err("isert_post_recv() count: %d failed, %d\n",
1509                                count, err);
1510                 }
1511         }
1512 }
1513
1514 static int
1515 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1516                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1517                    enum iser_ib_op_code op, struct isert_data_buf *data)
1518 {
1519         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1520
1521         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1522                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1523
1524         data->len = length - offset;
1525         data->offset = offset;
1526         data->sg_off = data->offset / PAGE_SIZE;
1527
1528         data->sg = &sg[data->sg_off];
1529         data->nents = min_t(unsigned int, nents - data->sg_off,
1530                                           ISCSI_ISER_SG_TABLESIZE);
1531         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1532                                         PAGE_SIZE);
1533
1534         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1535                                         data->dma_dir);
1536         if (unlikely(!data->dma_nents)) {
1537                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1538                 return -EINVAL;
1539         }
1540
1541         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1542                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1543
1544         return 0;
1545 }
1546
1547 static void
1548 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1549 {
1550         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1551
1552         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1553         memset(data, 0, sizeof(*data));
1554 }
1555
1556
1557
1558 static void
1559 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1560 {
1561         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1562
1563         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1564
1565         if (wr->data.sg) {
1566                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1567                 isert_unmap_data_buf(isert_conn, &wr->data);
1568         }
1569
1570         if (wr->send_wr) {
1571                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1572                 kfree(wr->send_wr);
1573                 wr->send_wr = NULL;
1574         }
1575
1576         if (wr->ib_sge) {
1577                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1578                 kfree(wr->ib_sge);
1579                 wr->ib_sge = NULL;
1580         }
1581 }
1582
1583 static void
1584 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1585 {
1586         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1587         LIST_HEAD(unmap_list);
1588
1589         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1590
1591         if (wr->fr_desc) {
1592                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1593                          isert_cmd, wr->fr_desc);
1594                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1595                         isert_unmap_data_buf(isert_conn, &wr->prot);
1596                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1597                 }
1598                 spin_lock_bh(&isert_conn->conn_lock);
1599                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1600                 spin_unlock_bh(&isert_conn->conn_lock);
1601                 wr->fr_desc = NULL;
1602         }
1603
1604         if (wr->data.sg) {
1605                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1606                 isert_unmap_data_buf(isert_conn, &wr->data);
1607         }
1608
1609         wr->ib_sge = NULL;
1610         wr->send_wr = NULL;
1611 }
1612
1613 static void
1614 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1615 {
1616         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1617         struct isert_conn *isert_conn = isert_cmd->conn;
1618         struct iscsi_conn *conn = isert_conn->conn;
1619         struct isert_device *device = isert_conn->conn_device;
1620
1621         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1622
1623         switch (cmd->iscsi_opcode) {
1624         case ISCSI_OP_SCSI_CMD:
1625                 spin_lock_bh(&conn->cmd_lock);
1626                 if (!list_empty(&cmd->i_conn_node))
1627                         list_del_init(&cmd->i_conn_node);
1628                 spin_unlock_bh(&conn->cmd_lock);
1629
1630                 if (cmd->data_direction == DMA_TO_DEVICE) {
1631                         iscsit_stop_dataout_timer(cmd);
1632                         /*
1633                          * Check for special case during comp_err where
1634                          * WRITE_PENDING has been handed off from core,
1635                          * but requires an extra target_put_sess_cmd()
1636                          * before transport_generic_free_cmd() below.
1637                          */
1638                         if (comp_err &&
1639                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1640                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1641
1642                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1643                         }
1644                 }
1645
1646                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1647                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1648                 break;
1649         case ISCSI_OP_SCSI_TMFUNC:
1650                 spin_lock_bh(&conn->cmd_lock);
1651                 if (!list_empty(&cmd->i_conn_node))
1652                         list_del_init(&cmd->i_conn_node);
1653                 spin_unlock_bh(&conn->cmd_lock);
1654
1655                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1656                 break;
1657         case ISCSI_OP_REJECT:
1658         case ISCSI_OP_NOOP_OUT:
1659         case ISCSI_OP_TEXT:
1660                 spin_lock_bh(&conn->cmd_lock);
1661                 if (!list_empty(&cmd->i_conn_node))
1662                         list_del_init(&cmd->i_conn_node);
1663                 spin_unlock_bh(&conn->cmd_lock);
1664
1665                 /*
1666                  * Handle special case for REJECT when iscsi_add_reject*() has
1667                  * overwritten the original iscsi_opcode assignment, and the
1668                  * associated cmd->se_cmd needs to be released.
1669                  */
1670                 if (cmd->se_cmd.se_tfo != NULL) {
1671                         pr_debug("Calling transport_generic_free_cmd from"
1672                                  " isert_put_cmd for 0x%02x\n",
1673                                  cmd->iscsi_opcode);
1674                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1675                         break;
1676                 }
1677                 /*
1678                  * Fall-through
1679                  */
1680         default:
1681                 iscsit_release_cmd(cmd);
1682                 break;
1683         }
1684 }
1685
1686 static void
1687 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1688 {
1689         if (tx_desc->dma_addr != 0) {
1690                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1691                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1692                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1693                 tx_desc->dma_addr = 0;
1694         }
1695 }
1696
1697 static void
1698 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1699                      struct ib_device *ib_dev, bool comp_err)
1700 {
1701         if (isert_cmd->pdu_buf_dma != 0) {
1702                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1703                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1704                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1705                 isert_cmd->pdu_buf_dma = 0;
1706         }
1707
1708         isert_unmap_tx_desc(tx_desc, ib_dev);
1709         isert_put_cmd(isert_cmd, comp_err);
1710 }
1711
1712 static int
1713 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1714 {
1715         struct ib_mr_status mr_status;
1716         int ret;
1717
1718         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1719         if (ret) {
1720                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1721                 goto fail_mr_status;
1722         }
1723
1724         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1725                 u64 sec_offset_err;
1726                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1727
1728                 switch (mr_status.sig_err.err_type) {
1729                 case IB_SIG_BAD_GUARD:
1730                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1731                         break;
1732                 case IB_SIG_BAD_REFTAG:
1733                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1734                         break;
1735                 case IB_SIG_BAD_APPTAG:
1736                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1737                         break;
1738                 }
1739                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1740                 do_div(sec_offset_err, block_size);
1741                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1742
1743                 pr_err("isert: PI error found type %d at sector 0x%llx "
1744                        "expected 0x%x vs actual 0x%x\n",
1745                        mr_status.sig_err.err_type,
1746                        (unsigned long long)se_cmd->bad_sector,
1747                        mr_status.sig_err.expected,
1748                        mr_status.sig_err.actual);
1749                 ret = 1;
1750         }
1751
1752 fail_mr_status:
1753         return ret;
1754 }
1755
1756 static void
1757 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1758                             struct isert_cmd *isert_cmd)
1759 {
1760         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1761         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1762         struct se_cmd *se_cmd = &cmd->se_cmd;
1763         struct isert_conn *isert_conn = isert_cmd->conn;
1764         struct isert_device *device = isert_conn->conn_device;
1765         int ret = 0;
1766
1767         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1768                 ret = isert_check_pi_status(se_cmd,
1769                                             wr->fr_desc->pi_ctx->sig_mr);
1770                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1771         }
1772
1773         device->unreg_rdma_mem(isert_cmd, isert_conn);
1774         wr->send_wr_num = 0;
1775         if (ret)
1776                 transport_send_check_condition_and_sense(se_cmd,
1777                                                          se_cmd->pi_err, 0);
1778         else
1779                 isert_put_response(isert_conn->conn, cmd);
1780 }
1781
1782 static void
1783 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1784                            struct isert_cmd *isert_cmd)
1785 {
1786         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1787         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1788         struct se_cmd *se_cmd = &cmd->se_cmd;
1789         struct isert_conn *isert_conn = isert_cmd->conn;
1790         struct isert_device *device = isert_conn->conn_device;
1791         int ret = 0;
1792
1793         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1794                 ret = isert_check_pi_status(se_cmd,
1795                                             wr->fr_desc->pi_ctx->sig_mr);
1796                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1797         }
1798
1799         iscsit_stop_dataout_timer(cmd);
1800         device->unreg_rdma_mem(isert_cmd, isert_conn);
1801         cmd->write_data_done = wr->data.len;
1802         wr->send_wr_num = 0;
1803
1804         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1805         spin_lock_bh(&cmd->istate_lock);
1806         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1807         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1808         spin_unlock_bh(&cmd->istate_lock);
1809
1810         if (ret)
1811                 transport_send_check_condition_and_sense(se_cmd,
1812                                                          se_cmd->pi_err, 0);
1813         else
1814                 target_execute_cmd(se_cmd);
1815 }
1816
1817 static void
1818 isert_do_control_comp(struct work_struct *work)
1819 {
1820         struct isert_cmd *isert_cmd = container_of(work,
1821                         struct isert_cmd, comp_work);
1822         struct isert_conn *isert_conn = isert_cmd->conn;
1823         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1824         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1825
1826         switch (cmd->i_state) {
1827         case ISTATE_SEND_TASKMGTRSP:
1828                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1829
1830                 atomic_dec(&isert_conn->post_send_buf_count);
1831                 iscsit_tmr_post_handler(cmd, cmd->conn);
1832
1833                 cmd->i_state = ISTATE_SENT_STATUS;
1834                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1835                 break;
1836         case ISTATE_SEND_REJECT:
1837                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1838                 atomic_dec(&isert_conn->post_send_buf_count);
1839
1840                 cmd->i_state = ISTATE_SENT_STATUS;
1841                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1842                 break;
1843         case ISTATE_SEND_LOGOUTRSP:
1844                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1845
1846                 atomic_dec(&isert_conn->post_send_buf_count);
1847                 iscsit_logout_post_handler(cmd, cmd->conn);
1848                 break;
1849         case ISTATE_SEND_TEXTRSP:
1850                 atomic_dec(&isert_conn->post_send_buf_count);
1851                 cmd->i_state = ISTATE_SENT_STATUS;
1852                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1853                 break;
1854         default:
1855                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1856                 dump_stack();
1857                 break;
1858         }
1859 }
1860
1861 static void
1862 isert_response_completion(struct iser_tx_desc *tx_desc,
1863                           struct isert_cmd *isert_cmd,
1864                           struct isert_conn *isert_conn,
1865                           struct ib_device *ib_dev)
1866 {
1867         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1868         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1869
1870         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1871             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1872             cmd->i_state == ISTATE_SEND_REJECT ||
1873             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1874                 isert_unmap_tx_desc(tx_desc, ib_dev);
1875
1876                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1877                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1878                 return;
1879         }
1880
1881         /**
1882          * If send_wr_num is 0 this means that we got
1883          * RDMA completion and we cleared it and we should
1884          * simply decrement the response post. else the
1885          * response is incorporated in send_wr_num, just
1886          * sub it.
1887          **/
1888         if (wr->send_wr_num)
1889                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1890         else
1891                 atomic_dec(&isert_conn->post_send_buf_count);
1892
1893         cmd->i_state = ISTATE_SENT_STATUS;
1894         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1895 }
1896
1897 static void
1898 __isert_send_completion(struct iser_tx_desc *tx_desc,
1899                         struct isert_conn *isert_conn)
1900 {
1901         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1902         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1903         struct isert_rdma_wr *wr;
1904
1905         if (!isert_cmd) {
1906                 atomic_dec(&isert_conn->post_send_buf_count);
1907                 isert_unmap_tx_desc(tx_desc, ib_dev);
1908                 return;
1909         }
1910         wr = &isert_cmd->rdma_wr;
1911
1912         switch (wr->iser_ib_op) {
1913         case ISER_IB_RECV:
1914                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1915                 dump_stack();
1916                 break;
1917         case ISER_IB_SEND:
1918                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1919                 isert_response_completion(tx_desc, isert_cmd,
1920                                           isert_conn, ib_dev);
1921                 break;
1922         case ISER_IB_RDMA_WRITE:
1923                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1924                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1925                 isert_completion_rdma_write(tx_desc, isert_cmd);
1926                 break;
1927         case ISER_IB_RDMA_READ:
1928                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1929
1930                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1931                 isert_completion_rdma_read(tx_desc, isert_cmd);
1932                 break;
1933         default:
1934                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1935                 dump_stack();
1936                 break;
1937         }
1938 }
1939
1940 static void
1941 isert_send_completion(struct iser_tx_desc *tx_desc,
1942                       struct isert_conn *isert_conn)
1943 {
1944         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1945         struct iser_tx_desc *t;
1946         /*
1947          * Drain coalesced completion llist starting from comp_llnode_batch
1948          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1949          */
1950         while (llnode) {
1951                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1952                 llnode = llist_next(llnode);
1953                 __isert_send_completion(t, isert_conn);
1954         }
1955         __isert_send_completion(tx_desc, isert_conn);
1956 }
1957
1958 static void
1959 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1960 {
1961         struct llist_node *llnode;
1962         struct isert_rdma_wr *wr;
1963         struct iser_tx_desc *t;
1964
1965         mutex_lock(&isert_conn->conn_mutex);
1966         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1967         isert_conn->conn_comp_batch = 0;
1968         mutex_unlock(&isert_conn->conn_mutex);
1969
1970         while (llnode) {
1971                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1972                 llnode = llist_next(llnode);
1973                 wr = &t->isert_cmd->rdma_wr;
1974
1975                 /**
1976                  * If send_wr_num is 0 this means that we got
1977                  * RDMA completion and we cleared it and we should
1978                  * simply decrement the response post. else the
1979                  * response is incorporated in send_wr_num, just
1980                  * sub it.
1981                  **/
1982                 if (wr->send_wr_num)
1983                         atomic_sub(wr->send_wr_num,
1984                                    &isert_conn->post_send_buf_count);
1985                 else
1986                         atomic_dec(&isert_conn->post_send_buf_count);
1987
1988                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1989         }
1990 }
1991
1992 static void
1993 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1994 {
1995         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1996         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1997         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1998         struct isert_rdma_wr *wr;
1999         struct iser_tx_desc *t;
2000
2001         while (llnode) {
2002                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2003                 llnode = llist_next(llnode);
2004                 wr = &t->isert_cmd->rdma_wr;
2005
2006                 /**
2007                  * If send_wr_num is 0 this means that we got
2008                  * RDMA completion and we cleared it and we should
2009                  * simply decrement the response post. else the
2010                  * response is incorporated in send_wr_num, just
2011                  * sub it.
2012                  **/
2013                 if (wr->send_wr_num)
2014                         atomic_sub(wr->send_wr_num,
2015                                    &isert_conn->post_send_buf_count);
2016                 else
2017                         atomic_dec(&isert_conn->post_send_buf_count);
2018
2019                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2020         }
2021         tx_desc->comp_llnode_batch = NULL;
2022
2023         if (!isert_cmd)
2024                 isert_unmap_tx_desc(tx_desc, ib_dev);
2025         else
2026                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2027 }
2028
2029 static void
2030 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2031 {
2032         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2033         struct iscsi_conn *conn = isert_conn->conn;
2034
2035         if (isert_conn->post_recv_buf_count)
2036                 return;
2037
2038         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2039
2040         if (conn->sess) {
2041                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2042                 target_wait_for_sess_cmds(conn->sess->se_sess);
2043         }
2044
2045         while (atomic_read(&isert_conn->post_send_buf_count))
2046                 msleep(3000);
2047
2048         mutex_lock(&isert_conn->conn_mutex);
2049         isert_conn->state = ISER_CONN_DOWN;
2050         mutex_unlock(&isert_conn->conn_mutex);
2051
2052         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2053
2054         complete(&isert_conn->conn_wait_comp_err);
2055 }
2056
2057 static void
2058 isert_cq_tx_work(struct work_struct *work)
2059 {
2060         struct isert_cq_desc *cq_desc = container_of(work,
2061                                 struct isert_cq_desc, cq_tx_work);
2062         struct isert_device *device = cq_desc->device;
2063         int cq_index = cq_desc->cq_index;
2064         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2065         struct isert_conn *isert_conn;
2066         struct iser_tx_desc *tx_desc;
2067         struct ib_wc wc;
2068
2069         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2070                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2071                 isert_conn = wc.qp->qp_context;
2072
2073                 if (wc.status == IB_WC_SUCCESS) {
2074                         isert_send_completion(tx_desc, isert_conn);
2075                 } else {
2076                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2077                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2078                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2079
2080                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2081                                 if (tx_desc->llnode_active)
2082                                         continue;
2083
2084                                 atomic_dec(&isert_conn->post_send_buf_count);
2085                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2086                         }
2087                 }
2088         }
2089
2090         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2091 }
2092
2093 static void
2094 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2095 {
2096         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2097
2098         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2099 }
2100
2101 static void
2102 isert_cq_rx_work(struct work_struct *work)
2103 {
2104         struct isert_cq_desc *cq_desc = container_of(work,
2105                         struct isert_cq_desc, cq_rx_work);
2106         struct isert_device *device = cq_desc->device;
2107         int cq_index = cq_desc->cq_index;
2108         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2109         struct isert_conn *isert_conn;
2110         struct iser_rx_desc *rx_desc;
2111         struct ib_wc wc;
2112         unsigned long xfer_len;
2113
2114         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2115                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2116                 isert_conn = wc.qp->qp_context;
2117
2118                 if (wc.status == IB_WC_SUCCESS) {
2119                         xfer_len = (unsigned long)wc.byte_len;
2120                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2121                 } else {
2122                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2123                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2124                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2125                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2126                                          wc.vendor_err);
2127                         }
2128                         isert_conn->post_recv_buf_count--;
2129                         isert_cq_rx_comp_err(isert_conn);
2130                 }
2131         }
2132
2133         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2134 }
2135
2136 static void
2137 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2138 {
2139         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2140
2141         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2142 }
2143
2144 static int
2145 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2146 {
2147         struct ib_send_wr *wr_failed;
2148         int ret;
2149
2150         atomic_inc(&isert_conn->post_send_buf_count);
2151
2152         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2153                            &wr_failed);
2154         if (ret) {
2155                 pr_err("ib_post_send failed with %d\n", ret);
2156                 atomic_dec(&isert_conn->post_send_buf_count);
2157                 return ret;
2158         }
2159         return ret;
2160 }
2161
2162 static int
2163 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2164 {
2165         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2166         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2167         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2168         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2169                                 &isert_cmd->tx_desc.iscsi_header;
2170
2171         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2172         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2173         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2174         /*
2175          * Attach SENSE DATA payload to iSCSI Response PDU
2176          */
2177         if (cmd->se_cmd.sense_buffer &&
2178             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2179             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2180                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2181                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2182                 u32 padding, pdu_len;
2183
2184                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2185                                    cmd->sense_buffer);
2186                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2187
2188                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2189                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2190                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2191
2192                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2193                                 (void *)cmd->sense_buffer, pdu_len,
2194                                 DMA_TO_DEVICE);
2195
2196                 isert_cmd->pdu_buf_len = pdu_len;
2197                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2198                 tx_dsg->length  = pdu_len;
2199                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2200                 isert_cmd->tx_desc.num_sge = 2;
2201         }
2202
2203         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2204
2205         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2206
2207         return isert_post_response(isert_conn, isert_cmd);
2208 }
2209
2210 static void
2211 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2212 {
2213         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2214         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2215         struct isert_device *device = isert_conn->conn_device;
2216
2217         spin_lock_bh(&conn->cmd_lock);
2218         if (!list_empty(&cmd->i_conn_node))
2219                 list_del_init(&cmd->i_conn_node);
2220         spin_unlock_bh(&conn->cmd_lock);
2221
2222         if (cmd->data_direction == DMA_TO_DEVICE)
2223                 iscsit_stop_dataout_timer(cmd);
2224
2225         device->unreg_rdma_mem(isert_cmd, isert_conn);
2226 }
2227
2228 static enum target_prot_op
2229 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2230 {
2231         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2232         struct isert_device *device = isert_conn->conn_device;
2233
2234         if (device->pi_capable)
2235                 return TARGET_PROT_ALL;
2236
2237         return TARGET_PROT_NORMAL;
2238 }
2239
2240 static int
2241 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2242                 bool nopout_response)
2243 {
2244         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2245         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2246         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2247
2248         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2249         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2250                                &isert_cmd->tx_desc.iscsi_header,
2251                                nopout_response);
2252         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2253         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2254
2255         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2256
2257         return isert_post_response(isert_conn, isert_cmd);
2258 }
2259
2260 static int
2261 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2262 {
2263         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2264         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2265         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2266
2267         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2268         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2269                                 &isert_cmd->tx_desc.iscsi_header);
2270         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2271         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2272
2273         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2274
2275         return isert_post_response(isert_conn, isert_cmd);
2276 }
2277
2278 static int
2279 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2280 {
2281         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2282         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2283         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2284
2285         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2286         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2287                                   &isert_cmd->tx_desc.iscsi_header);
2288         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2289         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2290
2291         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2292
2293         return isert_post_response(isert_conn, isert_cmd);
2294 }
2295
2296 static int
2297 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2298 {
2299         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2300         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2301         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2302         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2303         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2304         struct iscsi_reject *hdr =
2305                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2306
2307         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2308         iscsit_build_reject(cmd, conn, hdr);
2309         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2310
2311         hton24(hdr->dlength, ISCSI_HDR_LEN);
2312         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2313                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2314                         DMA_TO_DEVICE);
2315         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2316         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2317         tx_dsg->length  = ISCSI_HDR_LEN;
2318         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2319         isert_cmd->tx_desc.num_sge = 2;
2320
2321         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2322
2323         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2324
2325         return isert_post_response(isert_conn, isert_cmd);
2326 }
2327
2328 static int
2329 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2330 {
2331         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2332         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2333         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2334         struct iscsi_text_rsp *hdr =
2335                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2336         u32 txt_rsp_len;
2337         int rc;
2338
2339         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2340         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2341         if (rc < 0)
2342                 return rc;
2343
2344         txt_rsp_len = rc;
2345         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2346
2347         if (txt_rsp_len) {
2348                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2349                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2350                 void *txt_rsp_buf = cmd->buf_ptr;
2351
2352                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2353                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2354
2355                 isert_cmd->pdu_buf_len = txt_rsp_len;
2356                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2357                 tx_dsg->length  = txt_rsp_len;
2358                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2359                 isert_cmd->tx_desc.num_sge = 2;
2360         }
2361         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2362
2363         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2364
2365         return isert_post_response(isert_conn, isert_cmd);
2366 }
2367
2368 static int
2369 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2370                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2371                     u32 data_left, u32 offset)
2372 {
2373         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2374         struct scatterlist *sg_start, *tmp_sg;
2375         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2376         u32 sg_off, page_off;
2377         int i = 0, sg_nents;
2378
2379         sg_off = offset / PAGE_SIZE;
2380         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2381         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2382         page_off = offset % PAGE_SIZE;
2383
2384         send_wr->sg_list = ib_sge;
2385         send_wr->num_sge = sg_nents;
2386         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2387         /*
2388          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2389          */
2390         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2391                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2392                          (unsigned long long)tmp_sg->dma_address,
2393                          tmp_sg->length, page_off);
2394
2395                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2396                 ib_sge->length = min_t(u32, data_left,
2397                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2398                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2399
2400                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2401                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2402                 page_off = 0;
2403                 data_left -= ib_sge->length;
2404                 ib_sge++;
2405                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2406         }
2407
2408         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2409                  send_wr->sg_list, send_wr->num_sge);
2410
2411         return sg_nents;
2412 }
2413
2414 static int
2415 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2416                struct isert_rdma_wr *wr)
2417 {
2418         struct se_cmd *se_cmd = &cmd->se_cmd;
2419         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2420         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2421         struct isert_data_buf *data = &wr->data;
2422         struct ib_send_wr *send_wr;
2423         struct ib_sge *ib_sge;
2424         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2425         int ret = 0, i, ib_sge_cnt;
2426
2427         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2428
2429         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2430         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2431                                  se_cmd->t_data_nents, se_cmd->data_length,
2432                                  offset, wr->iser_ib_op, &wr->data);
2433         if (ret)
2434                 return ret;
2435
2436         data_left = data->len;
2437         offset = data->offset;
2438
2439         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2440         if (!ib_sge) {
2441                 pr_warn("Unable to allocate ib_sge\n");
2442                 ret = -ENOMEM;
2443                 goto unmap_cmd;
2444         }
2445         wr->ib_sge = ib_sge;
2446
2447         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2448         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2449                                 GFP_KERNEL);
2450         if (!wr->send_wr) {
2451                 pr_debug("Unable to allocate wr->send_wr\n");
2452                 ret = -ENOMEM;
2453                 goto unmap_cmd;
2454         }
2455
2456         wr->isert_cmd = isert_cmd;
2457         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2458
2459         for (i = 0; i < wr->send_wr_num; i++) {
2460                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2461                 data_len = min(data_left, rdma_write_max);
2462
2463                 send_wr->send_flags = 0;
2464                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2465                         send_wr->opcode = IB_WR_RDMA_WRITE;
2466                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2467                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2468                         if (i + 1 == wr->send_wr_num)
2469                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2470                         else
2471                                 send_wr->next = &wr->send_wr[i + 1];
2472                 } else {
2473                         send_wr->opcode = IB_WR_RDMA_READ;
2474                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2475                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2476                         if (i + 1 == wr->send_wr_num)
2477                                 send_wr->send_flags = IB_SEND_SIGNALED;
2478                         else
2479                                 send_wr->next = &wr->send_wr[i + 1];
2480                 }
2481
2482                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2483                                         send_wr, data_len, offset);
2484                 ib_sge += ib_sge_cnt;
2485
2486                 offset += data_len;
2487                 va_offset += data_len;
2488                 data_left -= data_len;
2489         }
2490
2491         return 0;
2492 unmap_cmd:
2493         isert_unmap_data_buf(isert_conn, data);
2494
2495         return ret;
2496 }
2497
2498 static int
2499 isert_map_fr_pagelist(struct ib_device *ib_dev,
2500                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2501 {
2502         u64 start_addr, end_addr, page, chunk_start = 0;
2503         struct scatterlist *tmp_sg;
2504         int i = 0, new_chunk, last_ent, n_pages;
2505
2506         n_pages = 0;
2507         new_chunk = 1;
2508         last_ent = sg_nents - 1;
2509         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2510                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2511                 if (new_chunk)
2512                         chunk_start = start_addr;
2513                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2514
2515                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2516                          i, (unsigned long long)tmp_sg->dma_address,
2517                          tmp_sg->length);
2518
2519                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2520                         new_chunk = 0;
2521                         continue;
2522                 }
2523                 new_chunk = 1;
2524
2525                 page = chunk_start & PAGE_MASK;
2526                 do {
2527                         fr_pl[n_pages++] = page;
2528                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2529                                  n_pages - 1, page);
2530                         page += PAGE_SIZE;
2531                 } while (page < end_addr);
2532         }
2533
2534         return n_pages;
2535 }
2536
2537 static int
2538 isert_fast_reg_mr(struct isert_conn *isert_conn,
2539                   struct fast_reg_descriptor *fr_desc,
2540                   struct isert_data_buf *mem,
2541                   enum isert_indicator ind,
2542                   struct ib_sge *sge)
2543 {
2544         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2545         struct ib_mr *mr;
2546         struct ib_fast_reg_page_list *frpl;
2547         struct ib_send_wr fr_wr, inv_wr;
2548         struct ib_send_wr *bad_wr, *wr = NULL;
2549         int ret, pagelist_len;
2550         u32 page_off;
2551         u8 key;
2552
2553         if (mem->dma_nents == 1) {
2554                 sge->lkey = isert_conn->conn_mr->lkey;
2555                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2556                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2557                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2558                          __func__, __LINE__, sge->addr, sge->length,
2559                          sge->lkey);
2560                 return 0;
2561         }
2562
2563         if (ind == ISERT_DATA_KEY_VALID) {
2564                 /* Registering data buffer */
2565                 mr = fr_desc->data_mr;
2566                 frpl = fr_desc->data_frpl;
2567         } else {
2568                 /* Registering protection buffer */
2569                 mr = fr_desc->pi_ctx->prot_mr;
2570                 frpl = fr_desc->pi_ctx->prot_frpl;
2571         }
2572
2573         page_off = mem->offset % PAGE_SIZE;
2574
2575         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2576                  fr_desc, mem->nents, mem->offset);
2577
2578         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2579                                              &frpl->page_list[0]);
2580
2581         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2582                 memset(&inv_wr, 0, sizeof(inv_wr));
2583                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2584                 inv_wr.opcode = IB_WR_LOCAL_INV;
2585                 inv_wr.ex.invalidate_rkey = mr->rkey;
2586                 wr = &inv_wr;
2587                 /* Bump the key */
2588                 key = (u8)(mr->rkey & 0x000000FF);
2589                 ib_update_fast_reg_key(mr, ++key);
2590         }
2591
2592         /* Prepare FASTREG WR */
2593         memset(&fr_wr, 0, sizeof(fr_wr));
2594         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2595         fr_wr.opcode = IB_WR_FAST_REG_MR;
2596         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2597         fr_wr.wr.fast_reg.page_list = frpl;
2598         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2599         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2600         fr_wr.wr.fast_reg.length = mem->len;
2601         fr_wr.wr.fast_reg.rkey = mr->rkey;
2602         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2603
2604         if (!wr)
2605                 wr = &fr_wr;
2606         else
2607                 wr->next = &fr_wr;
2608
2609         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2610         if (ret) {
2611                 pr_err("fast registration failed, ret:%d\n", ret);
2612                 return ret;
2613         }
2614         fr_desc->ind &= ~ind;
2615
2616         sge->lkey = mr->lkey;
2617         sge->addr = frpl->page_list[0] + page_off;
2618         sge->length = mem->len;
2619
2620         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2621                  __func__, __LINE__, sge->addr, sge->length,
2622                  sge->lkey);
2623
2624         return ret;
2625 }
2626
2627 static inline void
2628 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2629                      struct ib_sig_domain *domain)
2630 {
2631         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2632         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2633         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2634         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2635         /*
2636          * At the moment we hard code those, but if in the future
2637          * the target core would like to use it, we will take it
2638          * from se_cmd.
2639          */
2640         domain->sig.dif.apptag_check_mask = 0xffff;
2641         domain->sig.dif.app_escape = true;
2642         domain->sig.dif.ref_escape = true;
2643         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2644             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2645                 domain->sig.dif.ref_remap = true;
2646 };
2647
2648 static int
2649 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2650 {
2651         switch (se_cmd->prot_op) {
2652         case TARGET_PROT_DIN_INSERT:
2653         case TARGET_PROT_DOUT_STRIP:
2654                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2655                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2656                 break;
2657         case TARGET_PROT_DOUT_INSERT:
2658         case TARGET_PROT_DIN_STRIP:
2659                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2660                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2661                 break;
2662         case TARGET_PROT_DIN_PASS:
2663         case TARGET_PROT_DOUT_PASS:
2664                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2665                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2666                 break;
2667         default:
2668                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2669                 return -EINVAL;
2670         }
2671
2672         return 0;
2673 }
2674
2675 static inline u8
2676 isert_set_prot_checks(u8 prot_checks)
2677 {
2678         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2679                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2680                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2681 }
2682
2683 static int
2684 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2685                  struct fast_reg_descriptor *fr_desc,
2686                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2687                  struct ib_sge *sig_sge)
2688 {
2689         struct ib_send_wr sig_wr, inv_wr;
2690         struct ib_send_wr *bad_wr, *wr = NULL;
2691         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2692         struct ib_sig_attrs sig_attrs;
2693         int ret;
2694         u32 key;
2695
2696         memset(&sig_attrs, 0, sizeof(sig_attrs));
2697         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2698         if (ret)
2699                 goto err;
2700
2701         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2702
2703         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2704                 memset(&inv_wr, 0, sizeof(inv_wr));
2705                 inv_wr.opcode = IB_WR_LOCAL_INV;
2706                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2707                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2708                 wr = &inv_wr;
2709                 /* Bump the key */
2710                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2711                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2712         }
2713
2714         memset(&sig_wr, 0, sizeof(sig_wr));
2715         sig_wr.opcode = IB_WR_REG_SIG_MR;
2716         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2717         sig_wr.sg_list = data_sge;
2718         sig_wr.num_sge = 1;
2719         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2720         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2721         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2722         if (se_cmd->t_prot_sg)
2723                 sig_wr.wr.sig_handover.prot = prot_sge;
2724
2725         if (!wr)
2726                 wr = &sig_wr;
2727         else
2728                 wr->next = &sig_wr;
2729
2730         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2731         if (ret) {
2732                 pr_err("fast registration failed, ret:%d\n", ret);
2733                 goto err;
2734         }
2735         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2736
2737         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2738         sig_sge->addr = 0;
2739         sig_sge->length = se_cmd->data_length;
2740         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2741             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2742                 /*
2743                  * We have protection guards on the wire
2744                  * so we need to set a larget transfer
2745                  */
2746                 sig_sge->length += se_cmd->prot_length;
2747
2748         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2749                  sig_sge->addr, sig_sge->length,
2750                  sig_sge->lkey);
2751 err:
2752         return ret;
2753 }
2754
2755 static int
2756 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2757                struct isert_rdma_wr *wr)
2758 {
2759         struct se_cmd *se_cmd = &cmd->se_cmd;
2760         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2761         struct isert_conn *isert_conn = conn->context;
2762         struct ib_sge data_sge;
2763         struct ib_send_wr *send_wr;
2764         struct fast_reg_descriptor *fr_desc = NULL;
2765         u32 offset;
2766         int ret = 0;
2767         unsigned long flags;
2768
2769         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2770
2771         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2772         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2773                                  se_cmd->t_data_nents, se_cmd->data_length,
2774                                  offset, wr->iser_ib_op, &wr->data);
2775         if (ret)
2776                 return ret;
2777
2778         if (wr->data.dma_nents != 1 ||
2779             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2780                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2781                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2782                                            struct fast_reg_descriptor, list);
2783                 list_del(&fr_desc->list);
2784                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2785                 wr->fr_desc = fr_desc;
2786         }
2787
2788         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2789                                 ISERT_DATA_KEY_VALID, &data_sge);
2790         if (ret)
2791                 goto unmap_cmd;
2792
2793         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2794                 struct ib_sge prot_sge, sig_sge;
2795
2796                 if (se_cmd->t_prot_sg) {
2797                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2798                                                  se_cmd->t_prot_sg,
2799                                                  se_cmd->t_prot_nents,
2800                                                  se_cmd->prot_length,
2801                                                  0, wr->iser_ib_op, &wr->prot);
2802                         if (ret)
2803                                 goto unmap_cmd;
2804
2805                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2806                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2807                         if (ret)
2808                                 goto unmap_prot_cmd;
2809                 }
2810
2811                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2812                                        &data_sge, &prot_sge, &sig_sge);
2813                 if (ret)
2814                         goto unmap_prot_cmd;
2815
2816                 fr_desc->ind |= ISERT_PROTECTED;
2817                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2818         } else
2819                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2820
2821         wr->ib_sge = &wr->s_ib_sge;
2822         wr->send_wr_num = 1;
2823         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2824         wr->send_wr = &wr->s_send_wr;
2825         wr->isert_cmd = isert_cmd;
2826
2827         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2828         send_wr->sg_list = &wr->s_ib_sge;
2829         send_wr->num_sge = 1;
2830         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2831         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2832                 send_wr->opcode = IB_WR_RDMA_WRITE;
2833                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2834                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2835                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2836                                       0 : IB_SEND_SIGNALED;
2837         } else {
2838                 send_wr->opcode = IB_WR_RDMA_READ;
2839                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2840                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2841                 send_wr->send_flags = IB_SEND_SIGNALED;
2842         }
2843
2844         return 0;
2845 unmap_prot_cmd:
2846         if (se_cmd->t_prot_sg)
2847                 isert_unmap_data_buf(isert_conn, &wr->prot);
2848 unmap_cmd:
2849         if (fr_desc) {
2850                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2851                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2852                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2853         }
2854         isert_unmap_data_buf(isert_conn, &wr->data);
2855
2856         return ret;
2857 }
2858
2859 static int
2860 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2861 {
2862         struct se_cmd *se_cmd = &cmd->se_cmd;
2863         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2864         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2865         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2866         struct isert_device *device = isert_conn->conn_device;
2867         struct ib_send_wr *wr_failed;
2868         int rc;
2869
2870         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2871                  isert_cmd, se_cmd->data_length);
2872         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2873         rc = device->reg_rdma_mem(conn, cmd, wr);
2874         if (rc) {
2875                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2876                 return rc;
2877         }
2878
2879         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2880                 /*
2881                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2882                  */
2883                 isert_create_send_desc(isert_conn, isert_cmd,
2884                                        &isert_cmd->tx_desc);
2885                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2886                                      &isert_cmd->tx_desc.iscsi_header);
2887                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2888                 isert_init_send_wr(isert_conn, isert_cmd,
2889                                    &isert_cmd->tx_desc.send_wr, false);
2890                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2891                 wr->send_wr_num += 1;
2892         }
2893
2894         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2895
2896         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2897         if (rc) {
2898                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2899                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2900         }
2901
2902         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2903                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2904                          "READ\n", isert_cmd);
2905         else
2906                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2907                          isert_cmd);
2908
2909         return 1;
2910 }
2911
2912 static int
2913 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2914 {
2915         struct se_cmd *se_cmd = &cmd->se_cmd;
2916         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2917         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2918         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2919         struct isert_device *device = isert_conn->conn_device;
2920         struct ib_send_wr *wr_failed;
2921         int rc;
2922
2923         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2924                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2925         wr->iser_ib_op = ISER_IB_RDMA_READ;
2926         rc = device->reg_rdma_mem(conn, cmd, wr);
2927         if (rc) {
2928                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2929                 return rc;
2930         }
2931
2932         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2933
2934         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2935         if (rc) {
2936                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2937                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2938         }
2939         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2940                  isert_cmd);
2941
2942         return 0;
2943 }
2944
2945 static int
2946 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2947 {
2948         int ret;
2949
2950         switch (state) {
2951         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2952                 ret = isert_put_nopin(cmd, conn, false);
2953                 break;
2954         default:
2955                 pr_err("Unknown immediate state: 0x%02x\n", state);
2956                 ret = -EINVAL;
2957                 break;
2958         }
2959
2960         return ret;
2961 }
2962
2963 static int
2964 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2965 {
2966         int ret;
2967
2968         switch (state) {
2969         case ISTATE_SEND_LOGOUTRSP:
2970                 ret = isert_put_logout_rsp(cmd, conn);
2971                 if (!ret) {
2972                         pr_debug("Returning iSER Logout -EAGAIN\n");
2973                         ret = -EAGAIN;
2974                 }
2975                 break;
2976         case ISTATE_SEND_NOPIN:
2977                 ret = isert_put_nopin(cmd, conn, true);
2978                 break;
2979         case ISTATE_SEND_TASKMGTRSP:
2980                 ret = isert_put_tm_rsp(cmd, conn);
2981                 break;
2982         case ISTATE_SEND_REJECT:
2983                 ret = isert_put_reject(cmd, conn);
2984                 break;
2985         case ISTATE_SEND_TEXTRSP:
2986                 ret = isert_put_text_rsp(cmd, conn);
2987                 break;
2988         case ISTATE_SEND_STATUS:
2989                 /*
2990                  * Special case for sending non GOOD SCSI status from TX thread
2991                  * context during pre se_cmd excecution failure.
2992                  */
2993                 ret = isert_put_response(conn, cmd);
2994                 break;
2995         default:
2996                 pr_err("Unknown response state: 0x%02x\n", state);
2997                 ret = -EINVAL;
2998                 break;
2999         }
3000
3001         return ret;
3002 }
3003
3004 static int
3005 isert_setup_np(struct iscsi_np *np,
3006                struct __kernel_sockaddr_storage *ksockaddr)
3007 {
3008         struct isert_np *isert_np;
3009         struct rdma_cm_id *isert_lid;
3010         struct sockaddr *sa;
3011         int ret;
3012
3013         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3014         if (!isert_np) {
3015                 pr_err("Unable to allocate struct isert_np\n");
3016                 return -ENOMEM;
3017         }
3018         sema_init(&isert_np->np_sem, 0);
3019         mutex_init(&isert_np->np_accept_mutex);
3020         INIT_LIST_HEAD(&isert_np->np_accept_list);
3021         init_completion(&isert_np->np_login_comp);
3022
3023         sa = (struct sockaddr *)ksockaddr;
3024         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3025         /*
3026          * Setup the np->np_sockaddr from the passed sockaddr setup
3027          * in iscsi_target_configfs.c code..
3028          */
3029         memcpy(&np->np_sockaddr, ksockaddr,
3030                sizeof(struct __kernel_sockaddr_storage));
3031
3032         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3033                                 IB_QPT_RC);
3034         if (IS_ERR(isert_lid)) {
3035                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3036                        PTR_ERR(isert_lid));
3037                 ret = PTR_ERR(isert_lid);
3038                 goto out;
3039         }
3040
3041         ret = rdma_bind_addr(isert_lid, sa);
3042         if (ret) {
3043                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3044                 goto out_lid;
3045         }
3046
3047         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3048         if (ret) {
3049                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3050                 goto out_lid;
3051         }
3052
3053         isert_np->np_cm_id = isert_lid;
3054         np->np_context = isert_np;
3055         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3056
3057         return 0;
3058
3059 out_lid:
3060         rdma_destroy_id(isert_lid);
3061 out:
3062         kfree(isert_np);
3063         return ret;
3064 }
3065
3066 static int
3067 isert_rdma_accept(struct isert_conn *isert_conn)
3068 {
3069         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3070         struct rdma_conn_param cp;
3071         int ret;
3072
3073         memset(&cp, 0, sizeof(struct rdma_conn_param));
3074         cp.initiator_depth = isert_conn->initiator_depth;
3075         cp.retry_count = 7;
3076         cp.rnr_retry_count = 7;
3077
3078         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3079
3080         ret = rdma_accept(cm_id, &cp);
3081         if (ret) {
3082                 pr_err("rdma_accept() failed with: %d\n", ret);
3083                 return ret;
3084         }
3085
3086         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3087
3088         return 0;
3089 }
3090
3091 static int
3092 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3093 {
3094         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3095         int ret;
3096
3097         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3098         /*
3099          * For login requests after the first PDU, isert_rx_login_req() will
3100          * kick schedule_delayed_work(&conn->login_work) as the packet is
3101          * received, which turns this callback from iscsi_target_do_login_rx()
3102          * into a NOP.
3103          */
3104         if (!login->first_request)
3105                 return 0;
3106
3107         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3108         if (ret)
3109                 return ret;
3110
3111         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3112         return 0;
3113 }
3114
3115 static void
3116 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3117                     struct isert_conn *isert_conn)
3118 {
3119         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3120         struct rdma_route *cm_route = &cm_id->route;
3121         struct sockaddr_in *sock_in;
3122         struct sockaddr_in6 *sock_in6;
3123
3124         conn->login_family = np->np_sockaddr.ss_family;
3125
3126         if (np->np_sockaddr.ss_family == AF_INET6) {
3127                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3128                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3129                          &sock_in6->sin6_addr.in6_u);
3130                 conn->login_port = ntohs(sock_in6->sin6_port);
3131
3132                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3133                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3134                          &sock_in6->sin6_addr.in6_u);
3135                 conn->local_port = ntohs(sock_in6->sin6_port);
3136         } else {
3137                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3138                 sprintf(conn->login_ip, "%pI4",
3139                         &sock_in->sin_addr.s_addr);
3140                 conn->login_port = ntohs(sock_in->sin_port);
3141
3142                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3143                 sprintf(conn->local_ip, "%pI4",
3144                         &sock_in->sin_addr.s_addr);
3145                 conn->local_port = ntohs(sock_in->sin_port);
3146         }
3147 }
3148
3149 static int
3150 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3151 {
3152         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3153         struct isert_conn *isert_conn;
3154         int max_accept = 0, ret;
3155
3156 accept_wait:
3157         ret = down_interruptible(&isert_np->np_sem);
3158         if (ret || max_accept > 5)
3159                 return -ENODEV;
3160
3161         spin_lock_bh(&np->np_thread_lock);
3162         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3163                 spin_unlock_bh(&np->np_thread_lock);
3164                 pr_debug("np_thread_state %d for isert_accept_np\n",
3165                          np->np_thread_state);
3166                 /**
3167                  * No point in stalling here when np_thread
3168                  * is in state RESET/SHUTDOWN/EXIT - bail
3169                  **/
3170                 return -ENODEV;
3171         }
3172         spin_unlock_bh(&np->np_thread_lock);
3173
3174         mutex_lock(&isert_np->np_accept_mutex);
3175         if (list_empty(&isert_np->np_accept_list)) {
3176                 mutex_unlock(&isert_np->np_accept_mutex);
3177                 max_accept++;
3178                 goto accept_wait;
3179         }
3180         isert_conn = list_first_entry(&isert_np->np_accept_list,
3181                         struct isert_conn, conn_accept_node);
3182         list_del_init(&isert_conn->conn_accept_node);
3183         mutex_unlock(&isert_np->np_accept_mutex);
3184
3185         conn->context = isert_conn;
3186         isert_conn->conn = conn;
3187         max_accept = 0;
3188
3189         ret = isert_rdma_post_recvl(isert_conn);
3190         if (ret)
3191                 return ret;
3192
3193         ret = isert_rdma_accept(isert_conn);
3194         if (ret)
3195                 return ret;
3196
3197         isert_set_conn_info(np, conn, isert_conn);
3198
3199         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3200         return 0;
3201 }
3202
3203 static void
3204 isert_free_np(struct iscsi_np *np)
3205 {
3206         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3207
3208         if (isert_np->np_cm_id)
3209                 rdma_destroy_id(isert_np->np_cm_id);
3210
3211         np->np_context = NULL;
3212         kfree(isert_np);
3213 }
3214
3215 static void isert_wait_conn(struct iscsi_conn *conn)
3216 {
3217         struct isert_conn *isert_conn = conn->context;
3218
3219         pr_debug("isert_wait_conn: Starting \n");
3220
3221         mutex_lock(&isert_conn->conn_mutex);
3222         if (isert_conn->conn_cm_id && !isert_conn->disconnect) {
3223                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3224                 rdma_disconnect(isert_conn->conn_cm_id);
3225         }
3226         /*
3227          * Only wait for conn_wait_comp_err if the isert_conn made it
3228          * into full feature phase..
3229          */
3230         if (isert_conn->state == ISER_CONN_INIT) {
3231                 mutex_unlock(&isert_conn->conn_mutex);
3232                 return;
3233         }
3234         if (isert_conn->state == ISER_CONN_UP)
3235                 isert_conn->state = ISER_CONN_TERMINATING;
3236         mutex_unlock(&isert_conn->conn_mutex);
3237
3238         wait_for_completion(&isert_conn->conn_wait_comp_err);
3239
3240         wait_for_completion(&isert_conn->conn_wait);
3241         isert_put_conn(isert_conn);
3242 }
3243
3244 static void isert_free_conn(struct iscsi_conn *conn)
3245 {
3246         struct isert_conn *isert_conn = conn->context;
3247
3248         isert_put_conn(isert_conn);
3249 }
3250
3251 static struct iscsit_transport iser_target_transport = {
3252         .name                   = "IB/iSER",
3253         .transport_type         = ISCSI_INFINIBAND,
3254         .priv_size              = sizeof(struct isert_cmd),
3255         .owner                  = THIS_MODULE,
3256         .iscsit_setup_np        = isert_setup_np,
3257         .iscsit_accept_np       = isert_accept_np,
3258         .iscsit_free_np         = isert_free_np,
3259         .iscsit_wait_conn       = isert_wait_conn,
3260         .iscsit_free_conn       = isert_free_conn,
3261         .iscsit_get_login_rx    = isert_get_login_rx,
3262         .iscsit_put_login_tx    = isert_put_login_tx,
3263         .iscsit_immediate_queue = isert_immediate_queue,
3264         .iscsit_response_queue  = isert_response_queue,
3265         .iscsit_get_dataout     = isert_get_dataout,
3266         .iscsit_queue_data_in   = isert_put_datain,
3267         .iscsit_queue_status    = isert_put_response,
3268         .iscsit_aborted_task    = isert_aborted_task,
3269         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3270 };
3271
3272 static int __init isert_init(void)
3273 {
3274         int ret;
3275
3276         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3277         if (!isert_rx_wq) {
3278                 pr_err("Unable to allocate isert_rx_wq\n");
3279                 return -ENOMEM;
3280         }
3281
3282         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3283         if (!isert_comp_wq) {
3284                 pr_err("Unable to allocate isert_comp_wq\n");
3285                 ret = -ENOMEM;
3286                 goto destroy_rx_wq;
3287         }
3288
3289         iscsit_register_transport(&iser_target_transport);
3290         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3291         return 0;
3292
3293 destroy_rx_wq:
3294         destroy_workqueue(isert_rx_wq);
3295         return ret;
3296 }
3297
3298 static void __exit isert_exit(void)
3299 {
3300         flush_scheduled_work();
3301         destroy_workqueue(isert_comp_wq);
3302         destroy_workqueue(isert_rx_wq);
3303         iscsit_unregister_transport(&iser_target_transport);
3304         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3305 }
3306
3307 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3308 MODULE_VERSION("0.1");
3309 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3310 MODULE_LICENSE("GPL");
3311
3312 module_init(isert_init);
3313 module_exit(isert_exit);