drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static int
  56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  57
  58 static void
  59 isert_qp_event_callback(struct ib_event *e, void *context)
  60 {
  61         struct isert_conn *isert_conn = (struct isert_conn *)context;
  62
  63         pr_err("isert_qp_event_callback event: %d\n", e->event);
  64         switch (e->event) {
  65         case IB_EVENT_COMM_EST:
  66                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  67                 break;
  68         case IB_EVENT_QP_LAST_WQE_REACHED:
  69                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 static int
  77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  78 {
  79         int ret;
  80
  81         ret = ib_query_device(ib_dev, devattr);
  82         if (ret) {
  83                 pr_err("ib_query_device() failed: %d\n", ret);
  84                 return ret;
  85         }
  86         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  87         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  88
  89         return 0;
  90 }
  91
  92 static int
  93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  94                     u8 protection)
  95 {
  96         struct isert_device *device = isert_conn->conn_device;
  97         struct ib_qp_init_attr attr;
  98         int ret, index, min_index = 0;
  99
 100         mutex_lock(&device_list_mutex);
 101         for (index = 0; index < device->cqs_used; index++)
 102                 if (device->cq_active_qps[index] <
 103                     device->cq_active_qps[min_index])
 104                         min_index = index;
 105         device->cq_active_qps[min_index]++;
 106         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 107         mutex_unlock(&device_list_mutex);
 108
 109         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 110         attr.event_handler = isert_qp_event_callback;
 111         attr.qp_context = isert_conn;
 112         attr.send_cq = device->dev_tx_cq[min_index];
 113         attr.recv_cq = device->dev_rx_cq[min_index];
 114         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 115         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 116         /*
 117          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 118          * work-around for RDMA_READ..
 119          */
 120         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 121         isert_conn->max_sge = attr.cap.max_send_sge;
 122
 123         attr.cap.max_recv_sge = 1;
 124         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 125         attr.qp_type = IB_QPT_RC;
 126         if (protection)
 127                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 128
 129         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 130                  cma_id->device);
 131         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 132                  isert_conn->conn_pd->device);
 133
 134         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 135         if (ret) {
 136                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 137                 return ret;
 138         }
 139         isert_conn->conn_qp = cma_id->qp;
 140         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 141
 142         return 0;
 143 }
 144
 145 static void
 146 isert_cq_event_callback(struct ib_event *e, void *context)
 147 {
 148         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 149 }
 150
 151 static int
 152 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 153 {
 154         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 155         struct iser_rx_desc *rx_desc;
 156         struct ib_sge *rx_sg;
 157         u64 dma_addr;
 158         int i, j;
 159
 160         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 161                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 162         if (!isert_conn->conn_rx_descs)
 163                 goto fail;
 164
 165         rx_desc = isert_conn->conn_rx_descs;
 166
 167         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 168                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 169                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 170                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 171                         goto dma_map_fail;
 172
 173                 rx_desc->dma_addr = dma_addr;
 174
 175                 rx_sg = &rx_desc->rx_sg;
 176                 rx_sg->addr = rx_desc->dma_addr;
 177                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 178                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 179         }
 180
 181         isert_conn->conn_rx_desc_head = 0;
 182         return 0;
 183
 184 dma_map_fail:
 185         rx_desc = isert_conn->conn_rx_descs;
 186         for (j = 0; j < i; j++, rx_desc++) {
 187                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 188                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 189         }
 190         kfree(isert_conn->conn_rx_descs);
 191         isert_conn->conn_rx_descs = NULL;
 192 fail:
 193         return -ENOMEM;
 194 }
 195
 196 static void
 197 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 198 {
 199         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 200         struct iser_rx_desc *rx_desc;
 201         int i;
 202
 203         if (!isert_conn->conn_rx_descs)
 204                 return;
 205
 206         rx_desc = isert_conn->conn_rx_descs;
 207         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 208                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 209                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 210         }
 211
 212         kfree(isert_conn->conn_rx_descs);
 213         isert_conn->conn_rx_descs = NULL;
 214 }
 215
 216 static void isert_cq_tx_work(struct work_struct *);
 217 static void isert_cq_tx_callback(struct ib_cq *, void *);
 218 static void isert_cq_rx_work(struct work_struct *);
 219 static void isert_cq_rx_callback(struct ib_cq *, void *);
 220
 221 static int
 222 isert_create_device_ib_res(struct isert_device *device)
 223 {
 224         struct ib_device *ib_dev = device->ib_device;
 225         struct isert_cq_desc *cq_desc;
 226         struct ib_device_attr *dev_attr;
 227         int ret = 0, i, j;
 228
 229         dev_attr = &device->dev_attr;
 230         ret = isert_query_device(ib_dev, dev_attr);
 231         if (ret)
 232                 return ret;
 233
 234         /* asign function handlers */
 235         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 236             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 237                 device->use_fastreg = 1;
 238                 device->reg_rdma_mem = isert_reg_rdma;
 239                 device->unreg_rdma_mem = isert_unreg_rdma;
 240         } else {
 241                 device->use_fastreg = 0;
 242                 device->reg_rdma_mem = isert_map_rdma;
 243                 device->unreg_rdma_mem = isert_unmap_cmd;
 244         }
 245
 246         /* Check signature cap */
 247         device->pi_capable = dev_attr->device_cap_flags &
 248                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 249
 250         device->cqs_used = min_t(int, num_online_cpus(),
 251                                  device->ib_device->num_comp_vectors);
 252         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 253         pr_debug("Using %d CQs, device %s supports %d vectors support "
 254                  "Fast registration %d pi_capable %d\n",
 255                  device->cqs_used, device->ib_device->name,
 256                  device->ib_device->num_comp_vectors, device->use_fastreg,
 257                  device->pi_capable);
 258         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 259                                 device->cqs_used, GFP_KERNEL);
 260         if (!device->cq_desc) {
 261                 pr_err("Unable to allocate device->cq_desc\n");
 262                 return -ENOMEM;
 263         }
 264         cq_desc = device->cq_desc;
 265
 266         for (i = 0; i < device->cqs_used; i++) {
 267                 cq_desc[i].device = device;
 268                 cq_desc[i].cq_index = i;
 269
 270                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 271                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 272                                                 isert_cq_rx_callback,
 273                                                 isert_cq_event_callback,
 274                                                 (void *)&cq_desc[i],
 275                                                 ISER_MAX_RX_CQ_LEN, i);
 276                 if (IS_ERR(device->dev_rx_cq[i])) {
 277                         ret = PTR_ERR(device->dev_rx_cq[i]);
 278                         device->dev_rx_cq[i] = NULL;
 279                         goto out_cq;
 280                 }
 281
 282                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 283                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 284                                                 isert_cq_tx_callback,
 285                                                 isert_cq_event_callback,
 286                                                 (void *)&cq_desc[i],
 287                                                 ISER_MAX_TX_CQ_LEN, i);
 288                 if (IS_ERR(device->dev_tx_cq[i])) {
 289                         ret = PTR_ERR(device->dev_tx_cq[i]);
 290                         device->dev_tx_cq[i] = NULL;
 291                         goto out_cq;
 292                 }
 293
 294                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 295                 if (ret)
 296                         goto out_cq;
 297
 298                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 299                 if (ret)
 300                         goto out_cq;
 301         }
 302
 303         return 0;
 304
 305 out_cq:
 306         for (j = 0; j < i; j++) {
 307                 cq_desc = &device->cq_desc[j];
 308
 309                 if (device->dev_rx_cq[j]) {
 310                         cancel_work_sync(&cq_desc->cq_rx_work);
 311                         ib_destroy_cq(device->dev_rx_cq[j]);
 312                 }
 313                 if (device->dev_tx_cq[j]) {
 314                         cancel_work_sync(&cq_desc->cq_tx_work);
 315                         ib_destroy_cq(device->dev_tx_cq[j]);
 316                 }
 317         }
 318         kfree(device->cq_desc);
 319
 320         return ret;
 321 }
 322
 323 static void
 324 isert_free_device_ib_res(struct isert_device *device)
 325 {
 326         struct isert_cq_desc *cq_desc;
 327         int i;
 328
 329         for (i = 0; i < device->cqs_used; i++) {
 330                 cq_desc = &device->cq_desc[i];
 331
 332                 cancel_work_sync(&cq_desc->cq_rx_work);
 333                 cancel_work_sync(&cq_desc->cq_tx_work);
 334                 ib_destroy_cq(device->dev_rx_cq[i]);
 335                 ib_destroy_cq(device->dev_tx_cq[i]);
 336                 device->dev_rx_cq[i] = NULL;
 337                 device->dev_tx_cq[i] = NULL;
 338         }
 339
 340         kfree(device->cq_desc);
 341 }
 342
 343 static void
 344 isert_device_try_release(struct isert_device *device)
 345 {
 346         mutex_lock(&device_list_mutex);
 347         device->refcount--;
 348         if (!device->refcount) {
 349                 isert_free_device_ib_res(device);
 350                 list_del(&device->dev_node);
 351                 kfree(device);
 352         }
 353         mutex_unlock(&device_list_mutex);
 354 }
 355
 356 static struct isert_device *
 357 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 358 {
 359         struct isert_device *device;
 360         int ret;
 361
 362         mutex_lock(&device_list_mutex);
 363         list_for_each_entry(device, &device_list, dev_node) {
 364                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 365                         device->refcount++;
 366                         mutex_unlock(&device_list_mutex);
 367                         return device;
 368                 }
 369         }
 370
 371         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 372         if (!device) {
 373                 mutex_unlock(&device_list_mutex);
 374                 return ERR_PTR(-ENOMEM);
 375         }
 376
 377         INIT_LIST_HEAD(&device->dev_node);
 378
 379         device->ib_device = cma_id->device;
 380         ret = isert_create_device_ib_res(device);
 381         if (ret) {
 382                 kfree(device);
 383                 mutex_unlock(&device_list_mutex);
 384                 return ERR_PTR(ret);
 385         }
 386
 387         device->refcount++;
 388         list_add_tail(&device->dev_node, &device_list);
 389         mutex_unlock(&device_list_mutex);
 390
 391         return device;
 392 }
 393
 394 static void
 395 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 396 {
 397         struct fast_reg_descriptor *fr_desc, *tmp;
 398         int i = 0;
 399
 400         if (list_empty(&isert_conn->conn_fr_pool))
 401                 return;
 402
 403         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 404
 405         list_for_each_entry_safe(fr_desc, tmp,
 406                                  &isert_conn->conn_fr_pool, list) {
 407                 list_del(&fr_desc->list);
 408                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 409                 ib_dereg_mr(fr_desc->data_mr);
 410                 if (fr_desc->pi_ctx) {
 411                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 412                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 413                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 414                         kfree(fr_desc->pi_ctx);
 415                 }
 416                 kfree(fr_desc);
 417                 ++i;
 418         }
 419
 420         if (i < isert_conn->conn_fr_pool_size)
 421                 pr_warn("Pool still has %d regions registered\n",
 422                         isert_conn->conn_fr_pool_size - i);
 423 }
 424
 425 static int
 426 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 427                      struct fast_reg_descriptor *fr_desc, u8 protection)
 428 {
 429         int ret;
 430
 431         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 432                                                          ISCSI_ISER_SG_TABLESIZE);
 433         if (IS_ERR(fr_desc->data_frpl)) {
 434                 pr_err("Failed to allocate data frpl err=%ld\n",
 435                        PTR_ERR(fr_desc->data_frpl));
 436                 return PTR_ERR(fr_desc->data_frpl);
 437         }
 438
 439         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 440         if (IS_ERR(fr_desc->data_mr)) {
 441                 pr_err("Failed to allocate data frmr err=%ld\n",
 442                        PTR_ERR(fr_desc->data_mr));
 443                 ret = PTR_ERR(fr_desc->data_mr);
 444                 goto err_data_frpl;
 445         }
 446         pr_debug("Create fr_desc %p page_list %p\n",
 447                  fr_desc, fr_desc->data_frpl->page_list);
 448         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 449
 450         if (protection) {
 451                 struct ib_mr_init_attr mr_init_attr = {0};
 452                 struct pi_context *pi_ctx;
 453
 454                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 455                 if (!fr_desc->pi_ctx) {
 456                         pr_err("Failed to allocate pi context\n");
 457                         ret = -ENOMEM;
 458                         goto err_data_mr;
 459                 }
 460                 pi_ctx = fr_desc->pi_ctx;
 461
 462                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 463                                                     ISCSI_ISER_SG_TABLESIZE);
 464                 if (IS_ERR(pi_ctx->prot_frpl)) {
 465                         pr_err("Failed to allocate prot frpl err=%ld\n",
 466                                PTR_ERR(pi_ctx->prot_frpl));
 467                         ret = PTR_ERR(pi_ctx->prot_frpl);
 468                         goto err_pi_ctx;
 469                 }
 470
 471                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 472                 if (IS_ERR(pi_ctx->prot_mr)) {
 473                         pr_err("Failed to allocate prot frmr err=%ld\n",
 474                                PTR_ERR(pi_ctx->prot_mr));
 475                         ret = PTR_ERR(pi_ctx->prot_mr);
 476                         goto err_prot_frpl;
 477                 }
 478                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 479
 480                 mr_init_attr.max_reg_descriptors = 2;
 481                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 482                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 483                 if (IS_ERR(pi_ctx->sig_mr)) {
 484                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 485                                PTR_ERR(pi_ctx->sig_mr));
 486                         ret = PTR_ERR(pi_ctx->sig_mr);
 487                         goto err_prot_mr;
 488                 }
 489                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 490         }
 491         fr_desc->ind &= ~ISERT_PROTECTED;
 492
 493         return 0;
 494 err_prot_mr:
 495         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 496 err_prot_frpl:
 497         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 498 err_pi_ctx:
 499         kfree(fr_desc->pi_ctx);
 500 err_data_mr:
 501         ib_dereg_mr(fr_desc->data_mr);
 502 err_data_frpl:
 503         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 504
 505         return ret;
 506 }
 507
 508 static int
 509 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 510 {
 511         struct fast_reg_descriptor *fr_desc;
 512         struct isert_device *device = isert_conn->conn_device;
 513         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 514         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 515         int i, ret, tag_num;
 516         /*
 517          * Setup the number of FRMRs based upon the number of tags
 518          * available to session in iscsi_target_locate_portal().
 519          */
 520         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 521         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 522
 523         isert_conn->conn_fr_pool_size = 0;
 524         for (i = 0; i < tag_num; i++) {
 525                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 526                 if (!fr_desc) {
 527                         pr_err("Failed to allocate fast_reg descriptor\n");
 528                         ret = -ENOMEM;
 529                         goto err;
 530                 }
 531
 532                 ret = isert_create_fr_desc(device->ib_device,
 533                                            isert_conn->conn_pd, fr_desc,
 534                                            pi_support);
 535                 if (ret) {
 536                         pr_err("Failed to create fastreg descriptor err=%d\n",
 537                                ret);
 538                         kfree(fr_desc);
 539                         goto err;
 540                 }
 541
 542                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 543                 isert_conn->conn_fr_pool_size++;
 544         }
 545
 546         pr_debug("Creating conn %p fastreg pool size=%d",
 547                  isert_conn, isert_conn->conn_fr_pool_size);
 548
 549         return 0;
 550
 551 err:
 552         isert_conn_free_fastreg_pool(isert_conn);
 553         return ret;
 554 }
 555
 556 static int
 557 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 558 {
 559         struct iscsi_np *np = cma_id->context;
 560         struct isert_np *isert_np = np->np_context;
 561         struct isert_conn *isert_conn;
 562         struct isert_device *device;
 563         struct ib_device *ib_dev = cma_id->device;
 564         int ret = 0;
 565         u8 pi_support;
 566
 567         spin_lock_bh(&np->np_thread_lock);
 568         if (!np->enabled) {
 569                 spin_unlock_bh(&np->np_thread_lock);
 570                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 571                 return rdma_reject(cma_id, NULL, 0);
 572         }
 573         spin_unlock_bh(&np->np_thread_lock);
 574
 575         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 576                  cma_id, cma_id->context);
 577
 578         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 579         if (!isert_conn) {
 580                 pr_err("Unable to allocate isert_conn\n");
 581                 return -ENOMEM;
 582         }
 583         isert_conn->state = ISER_CONN_INIT;
 584         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 585         init_completion(&isert_conn->conn_login_comp);
 586         init_completion(&isert_conn->conn_wait);
 587         init_completion(&isert_conn->conn_wait_comp_err);
 588         kref_init(&isert_conn->conn_kref);
 589         kref_get(&isert_conn->conn_kref);
 590         mutex_init(&isert_conn->conn_mutex);
 591         spin_lock_init(&isert_conn->conn_lock);
 592         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 593
 594         cma_id->context = isert_conn;
 595         isert_conn->conn_cm_id = cma_id;
 596         isert_conn->responder_resources = event->param.conn.responder_resources;
 597         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 598         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 599                  isert_conn->responder_resources, isert_conn->initiator_depth);
 600
 601         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 602                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 603         if (!isert_conn->login_buf) {
 604                 pr_err("Unable to allocate isert_conn->login_buf\n");
 605                 ret = -ENOMEM;
 606                 goto out;
 607         }
 608
 609         isert_conn->login_req_buf = isert_conn->login_buf;
 610         isert_conn->login_rsp_buf = isert_conn->login_buf +
 611                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 612         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 613                  isert_conn->login_buf, isert_conn->login_req_buf,
 614                  isert_conn->login_rsp_buf);
 615
 616         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 617                                 (void *)isert_conn->login_req_buf,
 618                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 619
 620         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 621         if (ret) {
 622                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 623                        ret);
 624                 isert_conn->login_req_dma = 0;
 625                 goto out_login_buf;
 626         }
 627
 628         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 629                                         (void *)isert_conn->login_rsp_buf,
 630                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 631
 632         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 633         if (ret) {
 634                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 635                        ret);
 636                 isert_conn->login_rsp_dma = 0;
 637                 goto out_req_dma_map;
 638         }
 639
 640         device = isert_device_find_by_ib_dev(cma_id);
 641         if (IS_ERR(device)) {
 642                 ret = PTR_ERR(device);
 643                 goto out_rsp_dma_map;
 644         }
 645
 646         isert_conn->conn_device = device;
 647         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 648         if (IS_ERR(isert_conn->conn_pd)) {
 649                 ret = PTR_ERR(isert_conn->conn_pd);
 650                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 651                        isert_conn, ret);
 652                 goto out_pd;
 653         }
 654
 655         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 656                                            IB_ACCESS_LOCAL_WRITE);
 657         if (IS_ERR(isert_conn->conn_mr)) {
 658                 ret = PTR_ERR(isert_conn->conn_mr);
 659                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 660                        isert_conn, ret);
 661                 goto out_mr;
 662         }
 663
 664         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 665         if (pi_support && !device->pi_capable) {
 666                 pr_err("Protection information requested but not supported\n");
 667                 ret = -EINVAL;
 668                 goto out_mr;
 669         }
 670
 671         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 672         if (ret)
 673                 goto out_conn_dev;
 674
 675         mutex_lock(&isert_np->np_accept_mutex);
 676         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 677         mutex_unlock(&isert_np->np_accept_mutex);
 678
 679         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 680         up(&isert_np->np_sem);
 681         return 0;
 682
 683 out_conn_dev:
 684         ib_dereg_mr(isert_conn->conn_mr);
 685 out_mr:
 686         ib_dealloc_pd(isert_conn->conn_pd);
 687 out_pd:
 688         isert_device_try_release(device);
 689 out_rsp_dma_map:
 690         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 691                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 692 out_req_dma_map:
 693         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 694                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 695 out_login_buf:
 696         kfree(isert_conn->login_buf);
 697 out:
 698         kfree(isert_conn);
 699         return ret;
 700 }
 701
 702 static void
 703 isert_connect_release(struct isert_conn *isert_conn)
 704 {
 705         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 706         struct isert_device *device = isert_conn->conn_device;
 707         int cq_index;
 708
 709         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 710
 711         if (device && device->use_fastreg)
 712                 isert_conn_free_fastreg_pool(isert_conn);
 713
 714         if (isert_conn->conn_qp) {
 715                 cq_index = ((struct isert_cq_desc *)
 716                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 717                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 718                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 719
 720                 rdma_destroy_qp(isert_conn->conn_cm_id);
 721         }
 722
 723         isert_free_rx_descriptors(isert_conn);
 724         rdma_destroy_id(isert_conn->conn_cm_id);
 725
 726         ib_dereg_mr(isert_conn->conn_mr);
 727         ib_dealloc_pd(isert_conn->conn_pd);
 728
 729         if (isert_conn->login_buf) {
 730                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 731                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 732                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 733                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 734                                     DMA_FROM_DEVICE);
 735                 kfree(isert_conn->login_buf);
 736         }
 737         kfree(isert_conn);
 738
 739         if (device)
 740                 isert_device_try_release(device);
 741
 742         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 743 }
 744
 745 static void
 746 isert_connected_handler(struct rdma_cm_id *cma_id)
 747 {
 748         return;
 749 }
 750
 751 static void
 752 isert_release_conn_kref(struct kref *kref)
 753 {
 754         struct isert_conn *isert_conn = container_of(kref,
 755                                 struct isert_conn, conn_kref);
 756
 757         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 758                  current->comm, current->pid);
 759
 760         isert_connect_release(isert_conn);
 761 }
 762
 763 static void
 764 isert_put_conn(struct isert_conn *isert_conn)
 765 {
 766         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 767 }
 768
 769 static void
 770 isert_disconnect_work(struct work_struct *work)
 771 {
 772         struct isert_conn *isert_conn = container_of(work,
 773                                 struct isert_conn, conn_logout_work);
 774
 775         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 776         mutex_lock(&isert_conn->conn_mutex);
 777         if (isert_conn->state == ISER_CONN_UP)
 778                 isert_conn->state = ISER_CONN_TERMINATING;
 779
 780         if (isert_conn->post_recv_buf_count == 0 &&
 781             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 782                 mutex_unlock(&isert_conn->conn_mutex);
 783                 goto wake_up;
 784         }
 785         if (!isert_conn->conn_cm_id) {
 786                 mutex_unlock(&isert_conn->conn_mutex);
 787                 isert_put_conn(isert_conn);
 788                 return;
 789         }
 790         if (!isert_conn->logout_posted) {
 791                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 792                          " isert_disconnect_work\n");
 793                 rdma_disconnect(isert_conn->conn_cm_id);
 794                 mutex_unlock(&isert_conn->conn_mutex);
 795                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 796                 goto wake_up;
 797         }
 798         mutex_unlock(&isert_conn->conn_mutex);
 799
 800 wake_up:
 801         complete(&isert_conn->conn_wait);
 802         isert_put_conn(isert_conn);
 803 }
 804
 805 static void
 806 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 807 {
 808         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 809
 810         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 811         schedule_work(&isert_conn->conn_logout_work);
 812 }
 813
 814 static int
 815 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 816 {
 817         int ret = 0;
 818
 819         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 820                  event->event, event->status, cma_id->context, cma_id);
 821
 822         switch (event->event) {
 823         case RDMA_CM_EVENT_CONNECT_REQUEST:
 824                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 825                 ret = isert_connect_request(cma_id, event);
 826                 break;
 827         case RDMA_CM_EVENT_ESTABLISHED:
 828                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 829                 isert_connected_handler(cma_id);
 830                 break;
 831         case RDMA_CM_EVENT_DISCONNECTED:
 832                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 833                 isert_disconnected_handler(cma_id);
 834                 break;
 835         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 836         case RDMA_CM_EVENT_ADDR_CHANGE:
 837                 break;
 838         case RDMA_CM_EVENT_CONNECT_ERROR:
 839         default:
 840                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 841                 break;
 842         }
 843
 844         if (ret != 0) {
 845                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 846                        event->event, ret);
 847                 dump_stack();
 848         }
 849
 850         return ret;
 851 }
 852
 853 static int
 854 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 855 {
 856         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 857         int i, ret;
 858         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 859         struct iser_rx_desc *rx_desc;
 860
 861         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 862                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 863                 rx_wr->wr_id    = (unsigned long)rx_desc;
 864                 rx_wr->sg_list  = &rx_desc->rx_sg;
 865                 rx_wr->num_sge  = 1;
 866                 rx_wr->next     = rx_wr + 1;
 867                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 868         }
 869
 870         rx_wr--;
 871         rx_wr->next = NULL; /* mark end of work requests list */
 872
 873         isert_conn->post_recv_buf_count += count;
 874         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 875                                 &rx_wr_failed);
 876         if (ret) {
 877                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 878                 isert_conn->post_recv_buf_count -= count;
 879         } else {
 880                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 881                 isert_conn->conn_rx_desc_head = rx_head;
 882         }
 883         return ret;
 884 }
 885
 886 static int
 887 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 888 {
 889         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 890         struct ib_send_wr send_wr, *send_wr_failed;
 891         int ret;
 892
 893         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 894                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 895
 896         send_wr.next    = NULL;
 897         send_wr.wr_id   = (unsigned long)tx_desc;
 898         send_wr.sg_list = tx_desc->tx_sg;
 899         send_wr.num_sge = tx_desc->num_sge;
 900         send_wr.opcode  = IB_WR_SEND;
 901         send_wr.send_flags = IB_SEND_SIGNALED;
 902
 903         atomic_inc(&isert_conn->post_send_buf_count);
 904
 905         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 906         if (ret) {
 907                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 908                 atomic_dec(&isert_conn->post_send_buf_count);
 909         }
 910
 911         return ret;
 912 }
 913
 914 static void
 915 isert_create_send_desc(struct isert_conn *isert_conn,
 916                        struct isert_cmd *isert_cmd,
 917                        struct iser_tx_desc *tx_desc)
 918 {
 919         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 920
 921         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 922                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 923
 924         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 925         tx_desc->iser_header.flags = ISER_VER;
 926
 927         tx_desc->num_sge = 1;
 928         tx_desc->isert_cmd = isert_cmd;
 929
 930         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 931                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 932                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 933         }
 934 }
 935
 936 static int
 937 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 938                    struct iser_tx_desc *tx_desc)
 939 {
 940         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 941         u64 dma_addr;
 942
 943         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 944                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 945         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 946                 pr_err("ib_dma_mapping_error() failed\n");
 947                 return -ENOMEM;
 948         }
 949
 950         tx_desc->dma_addr = dma_addr;
 951         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 952         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 953         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 954
 955         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 956                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 957                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 958
 959         return 0;
 960 }
 961
 962 static void
 963 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 964                    struct ib_send_wr *send_wr, bool coalesce)
 965 {
 966         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 967
 968         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 969         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 970         send_wr->opcode = IB_WR_SEND;
 971         send_wr->sg_list = &tx_desc->tx_sg[0];
 972         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 973         /*
 974          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 975          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 976          */
 977         mutex_lock(&isert_conn->conn_mutex);
 978         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 979             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 980                 tx_desc->llnode_active = true;
 981                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 982                 mutex_unlock(&isert_conn->conn_mutex);
 983                 return;
 984         }
 985         isert_conn->conn_comp_batch = 0;
 986         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 987         mutex_unlock(&isert_conn->conn_mutex);
 988
 989         send_wr->send_flags = IB_SEND_SIGNALED;
 990 }
 991
 992 static int
 993 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 994 {
 995         struct ib_recv_wr rx_wr, *rx_wr_fail;
 996         struct ib_sge sge;
 997         int ret;
 998
 999         memset(&sge, 0, sizeof(struct ib_sge));
1000         sge.addr = isert_conn->login_req_dma;
1001         sge.length = ISER_RX_LOGIN_SIZE;
1002         sge.lkey = isert_conn->conn_mr->lkey;
1003
1004         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1005                 sge.addr, sge.length, sge.lkey);
1006
1007         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1008         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1009         rx_wr.sg_list = &sge;
1010         rx_wr.num_sge = 1;
1011
1012         isert_conn->post_recv_buf_count++;
1013         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1014         if (ret) {
1015                 pr_err("ib_post_recv() failed: %d\n", ret);
1016                 isert_conn->post_recv_buf_count--;
1017         }
1018
1019         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1020         return ret;
1021 }
1022
1023 static int
1024 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1025                    u32 length)
1026 {
1027         struct isert_conn *isert_conn = conn->context;
1028         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1029         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1030         int ret;
1031
1032         isert_create_send_desc(isert_conn, NULL, tx_desc);
1033
1034         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1035                sizeof(struct iscsi_hdr));
1036
1037         isert_init_tx_hdrs(isert_conn, tx_desc);
1038
1039         if (length > 0) {
1040                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1041
1042                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1043                                            length, DMA_TO_DEVICE);
1044
1045                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1046
1047                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1048                                               length, DMA_TO_DEVICE);
1049
1050                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1051                 tx_dsg->length  = length;
1052                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1053                 tx_desc->num_sge = 2;
1054         }
1055         if (!login->login_failed) {
1056                 if (login->login_complete) {
1057                         if (isert_conn->conn_device->use_fastreg) {
1058                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1059
1060                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1061                                                                      pi_support);
1062                                 if (ret) {
1063                                         pr_err("Conn: %p failed to create"
1064                                                " fastreg pool\n", isert_conn);
1065                                         return ret;
1066                                 }
1067                         }
1068
1069                         ret = isert_alloc_rx_descriptors(isert_conn);
1070                         if (ret)
1071                                 return ret;
1072
1073                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1074                         if (ret)
1075                                 return ret;
1076
1077                         isert_conn->state = ISER_CONN_UP;
1078                         goto post_send;
1079                 }
1080
1081                 ret = isert_rdma_post_recvl(isert_conn);
1082                 if (ret)
1083                         return ret;
1084         }
1085 post_send:
1086         ret = isert_post_send(isert_conn, tx_desc);
1087         if (ret)
1088                 return ret;
1089
1090         return 0;
1091 }
1092
1093 static void
1094 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1095                    struct isert_conn *isert_conn)
1096 {
1097         struct iscsi_conn *conn = isert_conn->conn;
1098         struct iscsi_login *login = conn->conn_login;
1099         int size;
1100
1101         if (!login) {
1102                 pr_err("conn->conn_login is NULL\n");
1103                 dump_stack();
1104                 return;
1105         }
1106
1107         if (login->first_request) {
1108                 struct iscsi_login_req *login_req =
1109                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1110                 /*
1111                  * Setup the initial iscsi_login values from the leading
1112                  * login request PDU.
1113                  */
1114                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1115                 login->current_stage =
1116                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1117                          >> 2;
1118                 login->version_min      = login_req->min_version;
1119                 login->version_max      = login_req->max_version;
1120                 memcpy(login->isid, login_req->isid, 6);
1121                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1122                 login->init_task_tag    = login_req->itt;
1123                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1124                 login->cid              = be16_to_cpu(login_req->cid);
1125                 login->tsih             = be16_to_cpu(login_req->tsih);
1126         }
1127
1128         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1129
1130         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1131         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1132                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1133         memcpy(login->req_buf, &rx_desc->data[0], size);
1134
1135         if (login->first_request) {
1136                 complete(&isert_conn->conn_login_comp);
1137                 return;
1138         }
1139         schedule_delayed_work(&conn->login_work, 0);
1140 }
1141
1142 static struct iscsi_cmd
1143 *isert_allocate_cmd(struct iscsi_conn *conn)
1144 {
1145         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1146         struct isert_cmd *isert_cmd;
1147         struct iscsi_cmd *cmd;
1148
1149         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1150         if (!cmd) {
1151                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1152                 return NULL;
1153         }
1154         isert_cmd = iscsit_priv_cmd(cmd);
1155         isert_cmd->conn = isert_conn;
1156         isert_cmd->iscsi_cmd = cmd;
1157
1158         return cmd;
1159 }
1160
1161 static int
1162 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1163                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1164                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1165 {
1166         struct iscsi_conn *conn = isert_conn->conn;
1167         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1168         struct scatterlist *sg;
1169         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1170         bool dump_payload = false;
1171
1172         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1173         if (rc < 0)
1174                 return rc;
1175
1176         imm_data = cmd->immediate_data;
1177         imm_data_len = cmd->first_burst_len;
1178         unsol_data = cmd->unsolicited_data;
1179
1180         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1181         if (rc < 0) {
1182                 return 0;
1183         } else if (rc > 0) {
1184                 dump_payload = true;
1185                 goto sequence_cmd;
1186         }
1187
1188         if (!imm_data)
1189                 return 0;
1190
1191         sg = &cmd->se_cmd.t_data_sg[0];
1192         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1193
1194         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1195                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1196
1197         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1198
1199         cmd->write_data_done += imm_data_len;
1200
1201         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1202                 spin_lock_bh(&cmd->istate_lock);
1203                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1204                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1205                 spin_unlock_bh(&cmd->istate_lock);
1206         }
1207
1208 sequence_cmd:
1209         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1210
1211         if (!rc && dump_payload == false && unsol_data)
1212                 iscsit_set_unsoliticed_dataout(cmd);
1213
1214         return 0;
1215 }
1216
1217 static int
1218 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1219                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1220 {
1221         struct scatterlist *sg_start;
1222         struct iscsi_conn *conn = isert_conn->conn;
1223         struct iscsi_cmd *cmd = NULL;
1224         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1225         u32 unsol_data_len = ntoh24(hdr->dlength);
1226         int rc, sg_nents, sg_off, page_off;
1227
1228         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1229         if (rc < 0)
1230                 return rc;
1231         else if (!cmd)
1232                 return 0;
1233         /*
1234          * FIXME: Unexpected unsolicited_data out
1235          */
1236         if (!cmd->unsolicited_data) {
1237                 pr_err("Received unexpected solicited data payload\n");
1238                 dump_stack();
1239                 return -1;
1240         }
1241
1242         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1243                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1244
1245         sg_off = cmd->write_data_done / PAGE_SIZE;
1246         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1247         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1248         page_off = cmd->write_data_done % PAGE_SIZE;
1249         /*
1250          * FIXME: Non page-aligned unsolicited_data out
1251          */
1252         if (page_off) {
1253                 pr_err("Received unexpected non-page aligned data payload\n");
1254                 dump_stack();
1255                 return -1;
1256         }
1257         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1258                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1259
1260         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1261                             unsol_data_len);
1262
1263         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1264         if (rc < 0)
1265                 return rc;
1266
1267         return 0;
1268 }
1269
1270 static int
1271 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1272                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1273                      unsigned char *buf)
1274 {
1275         struct iscsi_conn *conn = isert_conn->conn;
1276         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1277         int rc;
1278
1279         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1280         if (rc < 0)
1281                 return rc;
1282         /*
1283          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1284          */
1285
1286         return iscsit_process_nop_out(conn, cmd, hdr);
1287 }
1288
1289 static int
1290 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1291                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1292                       struct iscsi_text *hdr)
1293 {
1294         struct iscsi_conn *conn = isert_conn->conn;
1295         u32 payload_length = ntoh24(hdr->dlength);
1296         int rc;
1297         unsigned char *text_in;
1298
1299         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1300         if (rc < 0)
1301                 return rc;
1302
1303         text_in = kzalloc(payload_length, GFP_KERNEL);
1304         if (!text_in) {
1305                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1306                        payload_length);
1307                 return -ENOMEM;
1308         }
1309         cmd->text_in_ptr = text_in;
1310
1311         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1312
1313         return iscsit_process_text_cmd(conn, cmd, hdr);
1314 }
1315
1316 static int
1317 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1318                 uint32_t read_stag, uint64_t read_va,
1319                 uint32_t write_stag, uint64_t write_va)
1320 {
1321         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1322         struct iscsi_conn *conn = isert_conn->conn;
1323         struct iscsi_session *sess = conn->sess;
1324         struct iscsi_cmd *cmd;
1325         struct isert_cmd *isert_cmd;
1326         int ret = -EINVAL;
1327         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1328
1329         if (sess->sess_ops->SessionType &&
1330            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1331                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1332                        " ignoring\n", opcode);
1333                 return 0;
1334         }
1335
1336         switch (opcode) {
1337         case ISCSI_OP_SCSI_CMD:
1338                 cmd = isert_allocate_cmd(conn);
1339                 if (!cmd)
1340                         break;
1341
1342                 isert_cmd = iscsit_priv_cmd(cmd);
1343                 isert_cmd->read_stag = read_stag;
1344                 isert_cmd->read_va = read_va;
1345                 isert_cmd->write_stag = write_stag;
1346                 isert_cmd->write_va = write_va;
1347
1348                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1349                                         rx_desc, (unsigned char *)hdr);
1350                 break;
1351         case ISCSI_OP_NOOP_OUT:
1352                 cmd = isert_allocate_cmd(conn);
1353                 if (!cmd)
1354                         break;
1355
1356                 isert_cmd = iscsit_priv_cmd(cmd);
1357                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1358                                            rx_desc, (unsigned char *)hdr);
1359                 break;
1360         case ISCSI_OP_SCSI_DATA_OUT:
1361                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1362                                                 (unsigned char *)hdr);
1363                 break;
1364         case ISCSI_OP_SCSI_TMFUNC:
1365                 cmd = isert_allocate_cmd(conn);
1366                 if (!cmd)
1367                         break;
1368
1369                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1370                                                 (unsigned char *)hdr);
1371                 break;
1372         case ISCSI_OP_LOGOUT:
1373                 cmd = isert_allocate_cmd(conn);
1374                 if (!cmd)
1375                         break;
1376
1377                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1378                 if (ret > 0)
1379                         wait_for_completion_timeout(&conn->conn_logout_comp,
1380                                                     SECONDS_FOR_LOGOUT_COMP *
1381                                                     HZ);
1382                 break;
1383         case ISCSI_OP_TEXT:
1384                 cmd = isert_allocate_cmd(conn);
1385                 if (!cmd)
1386                         break;
1387
1388                 isert_cmd = iscsit_priv_cmd(cmd);
1389                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1390                                             rx_desc, (struct iscsi_text *)hdr);
1391                 break;
1392         default:
1393                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1394                 dump_stack();
1395                 break;
1396         }
1397
1398         return ret;
1399 }
1400
1401 static void
1402 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1403 {
1404         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1405         uint64_t read_va = 0, write_va = 0;
1406         uint32_t read_stag = 0, write_stag = 0;
1407         int rc;
1408
1409         switch (iser_hdr->flags & 0xF0) {
1410         case ISCSI_CTRL:
1411                 if (iser_hdr->flags & ISER_RSV) {
1412                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1413                         read_va = be64_to_cpu(iser_hdr->read_va);
1414                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1415                                  read_stag, (unsigned long long)read_va);
1416                 }
1417                 if (iser_hdr->flags & ISER_WSV) {
1418                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1419                         write_va = be64_to_cpu(iser_hdr->write_va);
1420                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1421                                  write_stag, (unsigned long long)write_va);
1422                 }
1423
1424                 pr_debug("ISER ISCSI_CTRL PDU\n");
1425                 break;
1426         case ISER_HELLO:
1427                 pr_err("iSER Hello message\n");
1428                 break;
1429         default:
1430                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1431                 break;
1432         }
1433
1434         rc = isert_rx_opcode(isert_conn, rx_desc,
1435                              read_stag, read_va, write_stag, write_va);
1436 }
1437
1438 static void
1439 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1440                     unsigned long xfer_len)
1441 {
1442         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1443         struct iscsi_hdr *hdr;
1444         u64 rx_dma;
1445         int rx_buflen, outstanding;
1446
1447         if ((char *)desc == isert_conn->login_req_buf) {
1448                 rx_dma = isert_conn->login_req_dma;
1449                 rx_buflen = ISER_RX_LOGIN_SIZE;
1450                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1451                          rx_dma, rx_buflen);
1452         } else {
1453                 rx_dma = desc->dma_addr;
1454                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1455                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1456                          rx_dma, rx_buflen);
1457         }
1458
1459         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1460
1461         hdr = &desc->iscsi_header;
1462         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1463                  hdr->opcode, hdr->itt, hdr->flags,
1464                  (int)(xfer_len - ISER_HEADERS_LEN));
1465
1466         if ((char *)desc == isert_conn->login_req_buf)
1467                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1468                                    isert_conn);
1469         else
1470                 isert_rx_do_work(desc, isert_conn);
1471
1472         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1473                                       DMA_FROM_DEVICE);
1474
1475         isert_conn->post_recv_buf_count--;
1476         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1477                  isert_conn->post_recv_buf_count);
1478
1479         if ((char *)desc == isert_conn->login_req_buf)
1480                 return;
1481
1482         outstanding = isert_conn->post_recv_buf_count;
1483         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1484                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1485                                 ISERT_MIN_POSTED_RX);
1486                 err = isert_post_recv(isert_conn, count);
1487                 if (err) {
1488                         pr_err("isert_post_recv() count: %d failed, %d\n",
1489                                count, err);
1490                 }
1491         }
1492 }
1493
1494 static int
1495 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1496                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1497                    enum iser_ib_op_code op, struct isert_data_buf *data)
1498 {
1499         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1500
1501         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1502                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1503
1504         data->len = length - offset;
1505         data->offset = offset;
1506         data->sg_off = data->offset / PAGE_SIZE;
1507
1508         data->sg = &sg[data->sg_off];
1509         data->nents = min_t(unsigned int, nents - data->sg_off,
1510                                           ISCSI_ISER_SG_TABLESIZE);
1511         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1512                                         PAGE_SIZE);
1513
1514         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1515                                         data->dma_dir);
1516         if (unlikely(!data->dma_nents)) {
1517                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1518                 return -EINVAL;
1519         }
1520
1521         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1522                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1523
1524         return 0;
1525 }
1526
1527 static void
1528 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1529 {
1530         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1531
1532         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1533         memset(data, 0, sizeof(*data));
1534 }
1535
1536
1537
1538 static void
1539 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1540 {
1541         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1542
1543         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1544
1545         if (wr->data.sg) {
1546                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1547                 isert_unmap_data_buf(isert_conn, &wr->data);
1548         }
1549
1550         if (wr->send_wr) {
1551                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1552                 kfree(wr->send_wr);
1553                 wr->send_wr = NULL;
1554         }
1555
1556         if (wr->ib_sge) {
1557                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1558                 kfree(wr->ib_sge);
1559                 wr->ib_sge = NULL;
1560         }
1561 }
1562
1563 static void
1564 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1565 {
1566         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1567         LIST_HEAD(unmap_list);
1568
1569         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1570
1571         if (wr->fr_desc) {
1572                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1573                          isert_cmd, wr->fr_desc);
1574                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1575                         isert_unmap_data_buf(isert_conn, &wr->prot);
1576                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1577                 }
1578                 spin_lock_bh(&isert_conn->conn_lock);
1579                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1580                 spin_unlock_bh(&isert_conn->conn_lock);
1581                 wr->fr_desc = NULL;
1582         }
1583
1584         if (wr->data.sg) {
1585                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1586                 isert_unmap_data_buf(isert_conn, &wr->data);
1587         }
1588
1589         wr->ib_sge = NULL;
1590         wr->send_wr = NULL;
1591 }
1592
1593 static void
1594 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1595 {
1596         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1597         struct isert_conn *isert_conn = isert_cmd->conn;
1598         struct iscsi_conn *conn = isert_conn->conn;
1599         struct isert_device *device = isert_conn->conn_device;
1600
1601         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1602
1603         switch (cmd->iscsi_opcode) {
1604         case ISCSI_OP_SCSI_CMD:
1605                 spin_lock_bh(&conn->cmd_lock);
1606                 if (!list_empty(&cmd->i_conn_node))
1607                         list_del_init(&cmd->i_conn_node);
1608                 spin_unlock_bh(&conn->cmd_lock);
1609
1610                 if (cmd->data_direction == DMA_TO_DEVICE) {
1611                         iscsit_stop_dataout_timer(cmd);
1612                         /*
1613                          * Check for special case during comp_err where
1614                          * WRITE_PENDING has been handed off from core,
1615                          * but requires an extra target_put_sess_cmd()
1616                          * before transport_generic_free_cmd() below.
1617                          */
1618                         if (comp_err &&
1619                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1620                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1621
1622                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1623                         }
1624                 }
1625
1626                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1627                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1628                 break;
1629         case ISCSI_OP_SCSI_TMFUNC:
1630                 spin_lock_bh(&conn->cmd_lock);
1631                 if (!list_empty(&cmd->i_conn_node))
1632                         list_del_init(&cmd->i_conn_node);
1633                 spin_unlock_bh(&conn->cmd_lock);
1634
1635                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1636                 break;
1637         case ISCSI_OP_REJECT:
1638         case ISCSI_OP_NOOP_OUT:
1639         case ISCSI_OP_TEXT:
1640                 spin_lock_bh(&conn->cmd_lock);
1641                 if (!list_empty(&cmd->i_conn_node))
1642                         list_del_init(&cmd->i_conn_node);
1643                 spin_unlock_bh(&conn->cmd_lock);
1644
1645                 /*
1646                  * Handle special case for REJECT when iscsi_add_reject*() has
1647                  * overwritten the original iscsi_opcode assignment, and the
1648                  * associated cmd->se_cmd needs to be released.
1649                  */
1650                 if (cmd->se_cmd.se_tfo != NULL) {
1651                         pr_debug("Calling transport_generic_free_cmd from"
1652                                  " isert_put_cmd for 0x%02x\n",
1653                                  cmd->iscsi_opcode);
1654                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1655                         break;
1656                 }
1657                 /*
1658                  * Fall-through
1659                  */
1660         default:
1661                 iscsit_release_cmd(cmd);
1662                 break;
1663         }
1664 }
1665
1666 static void
1667 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1668 {
1669         if (tx_desc->dma_addr != 0) {
1670                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1671                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1672                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1673                 tx_desc->dma_addr = 0;
1674         }
1675 }
1676
1677 static void
1678 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1679                      struct ib_device *ib_dev, bool comp_err)
1680 {
1681         if (isert_cmd->pdu_buf_dma != 0) {
1682                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1683                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1684                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1685                 isert_cmd->pdu_buf_dma = 0;
1686         }
1687
1688         isert_unmap_tx_desc(tx_desc, ib_dev);
1689         isert_put_cmd(isert_cmd, comp_err);
1690 }
1691
1692 static int
1693 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1694 {
1695         struct ib_mr_status mr_status;
1696         int ret;
1697
1698         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1699         if (ret) {
1700                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1701                 goto fail_mr_status;
1702         }
1703
1704         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1705                 u64 sec_offset_err;
1706                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1707
1708                 switch (mr_status.sig_err.err_type) {
1709                 case IB_SIG_BAD_GUARD:
1710                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1711                         break;
1712                 case IB_SIG_BAD_REFTAG:
1713                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1714                         break;
1715                 case IB_SIG_BAD_APPTAG:
1716                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1717                         break;
1718                 }
1719                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1720                 do_div(sec_offset_err, block_size);
1721                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1722
1723                 pr_err("isert: PI error found type %d at sector 0x%llx "
1724                        "expected 0x%x vs actual 0x%x\n",
1725                        mr_status.sig_err.err_type,
1726                        (unsigned long long)se_cmd->bad_sector,
1727                        mr_status.sig_err.expected,
1728                        mr_status.sig_err.actual);
1729                 ret = 1;
1730         }
1731
1732 fail_mr_status:
1733         return ret;
1734 }
1735
1736 static void
1737 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1738                             struct isert_cmd *isert_cmd)
1739 {
1740         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1741         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1742         struct se_cmd *se_cmd = &cmd->se_cmd;
1743         struct isert_conn *isert_conn = isert_cmd->conn;
1744         struct isert_device *device = isert_conn->conn_device;
1745         int ret = 0;
1746
1747         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1748                 ret = isert_check_pi_status(se_cmd,
1749                                             wr->fr_desc->pi_ctx->sig_mr);
1750                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1751         }
1752
1753         device->unreg_rdma_mem(isert_cmd, isert_conn);
1754         wr->send_wr_num = 0;
1755         if (ret)
1756                 transport_send_check_condition_and_sense(se_cmd,
1757                                                          se_cmd->pi_err, 0);
1758         else
1759                 isert_put_response(isert_conn->conn, cmd);
1760 }
1761
1762 static void
1763 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1764                            struct isert_cmd *isert_cmd)
1765 {
1766         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1767         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1768         struct se_cmd *se_cmd = &cmd->se_cmd;
1769         struct isert_conn *isert_conn = isert_cmd->conn;
1770         struct isert_device *device = isert_conn->conn_device;
1771         int ret = 0;
1772
1773         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1774                 ret = isert_check_pi_status(se_cmd,
1775                                             wr->fr_desc->pi_ctx->sig_mr);
1776                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1777         }
1778
1779         iscsit_stop_dataout_timer(cmd);
1780         device->unreg_rdma_mem(isert_cmd, isert_conn);
1781         cmd->write_data_done = wr->data.len;
1782         wr->send_wr_num = 0;
1783
1784         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1785         spin_lock_bh(&cmd->istate_lock);
1786         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1787         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1788         spin_unlock_bh(&cmd->istate_lock);
1789
1790         if (ret)
1791                 transport_send_check_condition_and_sense(se_cmd,
1792                                                          se_cmd->pi_err, 0);
1793         else
1794                 target_execute_cmd(se_cmd);
1795 }
1796
1797 static void
1798 isert_do_control_comp(struct work_struct *work)
1799 {
1800         struct isert_cmd *isert_cmd = container_of(work,
1801                         struct isert_cmd, comp_work);
1802         struct isert_conn *isert_conn = isert_cmd->conn;
1803         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1804         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1805
1806         switch (cmd->i_state) {
1807         case ISTATE_SEND_TASKMGTRSP:
1808                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1809
1810                 atomic_dec(&isert_conn->post_send_buf_count);
1811                 iscsit_tmr_post_handler(cmd, cmd->conn);
1812
1813                 cmd->i_state = ISTATE_SENT_STATUS;
1814                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1815                 break;
1816         case ISTATE_SEND_REJECT:
1817                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1818                 atomic_dec(&isert_conn->post_send_buf_count);
1819
1820                 cmd->i_state = ISTATE_SENT_STATUS;
1821                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1822                 break;
1823         case ISTATE_SEND_LOGOUTRSP:
1824                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1825                 /*
1826                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1827                  * from isert_wait_conn()
1828                  */
1829                 isert_conn->logout_posted = true;
1830                 iscsit_logout_post_handler(cmd, cmd->conn);
1831                 break;
1832         case ISTATE_SEND_TEXTRSP:
1833                 atomic_dec(&isert_conn->post_send_buf_count);
1834                 cmd->i_state = ISTATE_SENT_STATUS;
1835                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1836                 break;
1837         default:
1838                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1839                 dump_stack();
1840                 break;
1841         }
1842 }
1843
1844 static void
1845 isert_response_completion(struct iser_tx_desc *tx_desc,
1846                           struct isert_cmd *isert_cmd,
1847                           struct isert_conn *isert_conn,
1848                           struct ib_device *ib_dev)
1849 {
1850         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1851         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1852
1853         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1854             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1855             cmd->i_state == ISTATE_SEND_REJECT ||
1856             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1857                 isert_unmap_tx_desc(tx_desc, ib_dev);
1858
1859                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1860                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1861                 return;
1862         }
1863
1864         /**
1865          * If send_wr_num is 0 this means that we got
1866          * RDMA completion and we cleared it and we should
1867          * simply decrement the response post. else the
1868          * response is incorporated in send_wr_num, just
1869          * sub it.
1870          **/
1871         if (wr->send_wr_num)
1872                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1873         else
1874                 atomic_dec(&isert_conn->post_send_buf_count);
1875
1876         cmd->i_state = ISTATE_SENT_STATUS;
1877         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1878 }
1879
1880 static void
1881 __isert_send_completion(struct iser_tx_desc *tx_desc,
1882                         struct isert_conn *isert_conn)
1883 {
1884         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1885         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1886         struct isert_rdma_wr *wr;
1887
1888         if (!isert_cmd) {
1889                 atomic_dec(&isert_conn->post_send_buf_count);
1890                 isert_unmap_tx_desc(tx_desc, ib_dev);
1891                 return;
1892         }
1893         wr = &isert_cmd->rdma_wr;
1894
1895         switch (wr->iser_ib_op) {
1896         case ISER_IB_RECV:
1897                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1898                 dump_stack();
1899                 break;
1900         case ISER_IB_SEND:
1901                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1902                 isert_response_completion(tx_desc, isert_cmd,
1903                                           isert_conn, ib_dev);
1904                 break;
1905         case ISER_IB_RDMA_WRITE:
1906                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1907                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1908                 isert_completion_rdma_write(tx_desc, isert_cmd);
1909                 break;
1910         case ISER_IB_RDMA_READ:
1911                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1912
1913                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1914                 isert_completion_rdma_read(tx_desc, isert_cmd);
1915                 break;
1916         default:
1917                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1918                 dump_stack();
1919                 break;
1920         }
1921 }
1922
1923 static void
1924 isert_send_completion(struct iser_tx_desc *tx_desc,
1925                       struct isert_conn *isert_conn)
1926 {
1927         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1928         struct iser_tx_desc *t;
1929         /*
1930          * Drain coalesced completion llist starting from comp_llnode_batch
1931          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1932          */
1933         while (llnode) {
1934                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1935                 llnode = llist_next(llnode);
1936                 __isert_send_completion(t, isert_conn);
1937         }
1938         __isert_send_completion(tx_desc, isert_conn);
1939 }
1940
1941 static void
1942 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1943 {
1944         struct llist_node *llnode;
1945         struct isert_rdma_wr *wr;
1946         struct iser_tx_desc *t;
1947
1948         mutex_lock(&isert_conn->conn_mutex);
1949         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1950         isert_conn->conn_comp_batch = 0;
1951         mutex_unlock(&isert_conn->conn_mutex);
1952
1953         while (llnode) {
1954                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1955                 llnode = llist_next(llnode);
1956                 wr = &t->isert_cmd->rdma_wr;
1957
1958                 /**
1959                  * If send_wr_num is 0 this means that we got
1960                  * RDMA completion and we cleared it and we should
1961                  * simply decrement the response post. else the
1962                  * response is incorporated in send_wr_num, just
1963                  * sub it.
1964                  **/
1965                 if (wr->send_wr_num)
1966                         atomic_sub(wr->send_wr_num,
1967                                    &isert_conn->post_send_buf_count);
1968                 else
1969                         atomic_dec(&isert_conn->post_send_buf_count);
1970
1971                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1972         }
1973 }
1974
1975 static void
1976 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1977 {
1978         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1979         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1980         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1981         struct isert_rdma_wr *wr;
1982         struct iser_tx_desc *t;
1983
1984         while (llnode) {
1985                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1986                 llnode = llist_next(llnode);
1987                 wr = &t->isert_cmd->rdma_wr;
1988
1989                 /**
1990                  * If send_wr_num is 0 this means that we got
1991                  * RDMA completion and we cleared it and we should
1992                  * simply decrement the response post. else the
1993                  * response is incorporated in send_wr_num, just
1994                  * sub it.
1995                  **/
1996                 if (wr->send_wr_num)
1997                         atomic_sub(wr->send_wr_num,
1998                                    &isert_conn->post_send_buf_count);
1999                 else
2000                         atomic_dec(&isert_conn->post_send_buf_count);
2001
2002                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2003         }
2004         tx_desc->comp_llnode_batch = NULL;
2005
2006         if (!isert_cmd)
2007                 isert_unmap_tx_desc(tx_desc, ib_dev);
2008         else
2009                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2010 }
2011
2012 static void
2013 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2014 {
2015         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2016         struct iscsi_conn *conn = isert_conn->conn;
2017
2018         if (isert_conn->post_recv_buf_count)
2019                 return;
2020
2021         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2022
2023         if (conn->sess) {
2024                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2025                 target_wait_for_sess_cmds(conn->sess->se_sess);
2026         }
2027
2028         while (atomic_read(&isert_conn->post_send_buf_count))
2029                 msleep(3000);
2030
2031         mutex_lock(&isert_conn->conn_mutex);
2032         isert_conn->state = ISER_CONN_DOWN;
2033         mutex_unlock(&isert_conn->conn_mutex);
2034
2035         complete(&isert_conn->conn_wait_comp_err);
2036 }
2037
2038 static void
2039 isert_cq_tx_work(struct work_struct *work)
2040 {
2041         struct isert_cq_desc *cq_desc = container_of(work,
2042                                 struct isert_cq_desc, cq_tx_work);
2043         struct isert_device *device = cq_desc->device;
2044         int cq_index = cq_desc->cq_index;
2045         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2046         struct isert_conn *isert_conn;
2047         struct iser_tx_desc *tx_desc;
2048         struct ib_wc wc;
2049
2050         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2051                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2052                 isert_conn = wc.qp->qp_context;
2053
2054                 if (wc.status == IB_WC_SUCCESS) {
2055                         isert_send_completion(tx_desc, isert_conn);
2056                 } else {
2057                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2058                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2059                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2060
2061                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2062                                 if (tx_desc->llnode_active)
2063                                         continue;
2064
2065                                 atomic_dec(&isert_conn->post_send_buf_count);
2066                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2067                         }
2068                 }
2069         }
2070
2071         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2072 }
2073
2074 static void
2075 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2076 {
2077         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2078
2079         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2080 }
2081
2082 static void
2083 isert_cq_rx_work(struct work_struct *work)
2084 {
2085         struct isert_cq_desc *cq_desc = container_of(work,
2086                         struct isert_cq_desc, cq_rx_work);
2087         struct isert_device *device = cq_desc->device;
2088         int cq_index = cq_desc->cq_index;
2089         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2090         struct isert_conn *isert_conn;
2091         struct iser_rx_desc *rx_desc;
2092         struct ib_wc wc;
2093         unsigned long xfer_len;
2094
2095         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2096                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2097                 isert_conn = wc.qp->qp_context;
2098
2099                 if (wc.status == IB_WC_SUCCESS) {
2100                         xfer_len = (unsigned long)wc.byte_len;
2101                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2102                 } else {
2103                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2104                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2105                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2106                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2107                                          wc.vendor_err);
2108                         }
2109                         isert_conn->post_recv_buf_count--;
2110                         isert_cq_rx_comp_err(isert_conn);
2111                 }
2112         }
2113
2114         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2115 }
2116
2117 static void
2118 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2119 {
2120         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2121
2122         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2123 }
2124
2125 static int
2126 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2127 {
2128         struct ib_send_wr *wr_failed;
2129         int ret;
2130
2131         atomic_inc(&isert_conn->post_send_buf_count);
2132
2133         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2134                            &wr_failed);
2135         if (ret) {
2136                 pr_err("ib_post_send failed with %d\n", ret);
2137                 atomic_dec(&isert_conn->post_send_buf_count);
2138                 return ret;
2139         }
2140         return ret;
2141 }
2142
2143 static int
2144 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2145 {
2146         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2147         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2148         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2149         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2150                                 &isert_cmd->tx_desc.iscsi_header;
2151
2152         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2153         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2154         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2155         /*
2156          * Attach SENSE DATA payload to iSCSI Response PDU
2157          */
2158         if (cmd->se_cmd.sense_buffer &&
2159             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2160             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2161                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2162                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2163                 u32 padding, pdu_len;
2164
2165                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2166                                    cmd->sense_buffer);
2167                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2168
2169                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2170                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2171                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2172
2173                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2174                                 (void *)cmd->sense_buffer, pdu_len,
2175                                 DMA_TO_DEVICE);
2176
2177                 isert_cmd->pdu_buf_len = pdu_len;
2178                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2179                 tx_dsg->length  = pdu_len;
2180                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2181                 isert_cmd->tx_desc.num_sge = 2;
2182         }
2183
2184         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2185
2186         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2187
2188         return isert_post_response(isert_conn, isert_cmd);
2189 }
2190
2191 static void
2192 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2193 {
2194         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2195         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2196         struct isert_device *device = isert_conn->conn_device;
2197
2198         spin_lock_bh(&conn->cmd_lock);
2199         if (!list_empty(&cmd->i_conn_node))
2200                 list_del_init(&cmd->i_conn_node);
2201         spin_unlock_bh(&conn->cmd_lock);
2202
2203         if (cmd->data_direction == DMA_TO_DEVICE)
2204                 iscsit_stop_dataout_timer(cmd);
2205
2206         device->unreg_rdma_mem(isert_cmd, isert_conn);
2207 }
2208
2209 static enum target_prot_op
2210 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2211 {
2212         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2213         struct isert_device *device = isert_conn->conn_device;
2214
2215         if (device->pi_capable)
2216                 return TARGET_PROT_ALL;
2217
2218         return TARGET_PROT_NORMAL;
2219 }
2220
2221 static int
2222 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2223                 bool nopout_response)
2224 {
2225         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2226         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2227         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2228
2229         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2230         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2231                                &isert_cmd->tx_desc.iscsi_header,
2232                                nopout_response);
2233         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2234         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2235
2236         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2237
2238         return isert_post_response(isert_conn, isert_cmd);
2239 }
2240
2241 static int
2242 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
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_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2250                                 &isert_cmd->tx_desc.iscsi_header);
2251         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2252         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2253
2254         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2255
2256         return isert_post_response(isert_conn, isert_cmd);
2257 }
2258
2259 static int
2260 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2261 {
2262         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2263         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2264         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2265
2266         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2267         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2268                                   &isert_cmd->tx_desc.iscsi_header);
2269         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2270         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2271
2272         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2273
2274         return isert_post_response(isert_conn, isert_cmd);
2275 }
2276
2277 static int
2278 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2279 {
2280         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2281         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2282         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2283         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2284         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2285         struct iscsi_reject *hdr =
2286                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2287
2288         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2289         iscsit_build_reject(cmd, conn, hdr);
2290         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2291
2292         hton24(hdr->dlength, ISCSI_HDR_LEN);
2293         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2294                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2295                         DMA_TO_DEVICE);
2296         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2297         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2298         tx_dsg->length  = ISCSI_HDR_LEN;
2299         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2300         isert_cmd->tx_desc.num_sge = 2;
2301
2302         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2303
2304         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2305
2306         return isert_post_response(isert_conn, isert_cmd);
2307 }
2308
2309 static int
2310 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2311 {
2312         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2313         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2314         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2315         struct iscsi_text_rsp *hdr =
2316                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2317         u32 txt_rsp_len;
2318         int rc;
2319
2320         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2321         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2322         if (rc < 0)
2323                 return rc;
2324
2325         txt_rsp_len = rc;
2326         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2327
2328         if (txt_rsp_len) {
2329                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2330                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2331                 void *txt_rsp_buf = cmd->buf_ptr;
2332
2333                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2334                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2335
2336                 isert_cmd->pdu_buf_len = txt_rsp_len;
2337                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2338                 tx_dsg->length  = txt_rsp_len;
2339                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2340                 isert_cmd->tx_desc.num_sge = 2;
2341         }
2342         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2343
2344         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2345
2346         return isert_post_response(isert_conn, isert_cmd);
2347 }
2348
2349 static int
2350 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2351                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2352                     u32 data_left, u32 offset)
2353 {
2354         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2355         struct scatterlist *sg_start, *tmp_sg;
2356         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2357         u32 sg_off, page_off;
2358         int i = 0, sg_nents;
2359
2360         sg_off = offset / PAGE_SIZE;
2361         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2362         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2363         page_off = offset % PAGE_SIZE;
2364
2365         send_wr->sg_list = ib_sge;
2366         send_wr->num_sge = sg_nents;
2367         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2368         /*
2369          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2370          */
2371         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2372                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2373                          (unsigned long long)tmp_sg->dma_address,
2374                          tmp_sg->length, page_off);
2375
2376                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2377                 ib_sge->length = min_t(u32, data_left,
2378                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2379                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2380
2381                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2382                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2383                 page_off = 0;
2384                 data_left -= ib_sge->length;
2385                 ib_sge++;
2386                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2387         }
2388
2389         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2390                  send_wr->sg_list, send_wr->num_sge);
2391
2392         return sg_nents;
2393 }
2394
2395 static int
2396 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2397                struct isert_rdma_wr *wr)
2398 {
2399         struct se_cmd *se_cmd = &cmd->se_cmd;
2400         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2401         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2402         struct isert_data_buf *data = &wr->data;
2403         struct ib_send_wr *send_wr;
2404         struct ib_sge *ib_sge;
2405         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2406         int ret = 0, i, ib_sge_cnt;
2407
2408         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2409
2410         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2411         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2412                                  se_cmd->t_data_nents, se_cmd->data_length,
2413                                  offset, wr->iser_ib_op, &wr->data);
2414         if (ret)
2415                 return ret;
2416
2417         data_left = data->len;
2418         offset = data->offset;
2419
2420         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2421         if (!ib_sge) {
2422                 pr_warn("Unable to allocate ib_sge\n");
2423                 ret = -ENOMEM;
2424                 goto unmap_cmd;
2425         }
2426         wr->ib_sge = ib_sge;
2427
2428         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2429         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2430                                 GFP_KERNEL);
2431         if (!wr->send_wr) {
2432                 pr_debug("Unable to allocate wr->send_wr\n");
2433                 ret = -ENOMEM;
2434                 goto unmap_cmd;
2435         }
2436
2437         wr->isert_cmd = isert_cmd;
2438         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2439
2440         for (i = 0; i < wr->send_wr_num; i++) {
2441                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2442                 data_len = min(data_left, rdma_write_max);
2443
2444                 send_wr->send_flags = 0;
2445                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2446                         send_wr->opcode = IB_WR_RDMA_WRITE;
2447                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2448                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2449                         if (i + 1 == wr->send_wr_num)
2450                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2451                         else
2452                                 send_wr->next = &wr->send_wr[i + 1];
2453                 } else {
2454                         send_wr->opcode = IB_WR_RDMA_READ;
2455                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2456                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2457                         if (i + 1 == wr->send_wr_num)
2458                                 send_wr->send_flags = IB_SEND_SIGNALED;
2459                         else
2460                                 send_wr->next = &wr->send_wr[i + 1];
2461                 }
2462
2463                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2464                                         send_wr, data_len, offset);
2465                 ib_sge += ib_sge_cnt;
2466
2467                 offset += data_len;
2468                 va_offset += data_len;
2469                 data_left -= data_len;
2470         }
2471
2472         return 0;
2473 unmap_cmd:
2474         isert_unmap_data_buf(isert_conn, data);
2475
2476         return ret;
2477 }
2478
2479 static int
2480 isert_map_fr_pagelist(struct ib_device *ib_dev,
2481                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2482 {
2483         u64 start_addr, end_addr, page, chunk_start = 0;
2484         struct scatterlist *tmp_sg;
2485         int i = 0, new_chunk, last_ent, n_pages;
2486
2487         n_pages = 0;
2488         new_chunk = 1;
2489         last_ent = sg_nents - 1;
2490         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2491                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2492                 if (new_chunk)
2493                         chunk_start = start_addr;
2494                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2495
2496                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2497                          i, (unsigned long long)tmp_sg->dma_address,
2498                          tmp_sg->length);
2499
2500                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2501                         new_chunk = 0;
2502                         continue;
2503                 }
2504                 new_chunk = 1;
2505
2506                 page = chunk_start & PAGE_MASK;
2507                 do {
2508                         fr_pl[n_pages++] = page;
2509                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2510                                  n_pages - 1, page);
2511                         page += PAGE_SIZE;
2512                 } while (page < end_addr);
2513         }
2514
2515         return n_pages;
2516 }
2517
2518 static int
2519 isert_fast_reg_mr(struct isert_conn *isert_conn,
2520                   struct fast_reg_descriptor *fr_desc,
2521                   struct isert_data_buf *mem,
2522                   enum isert_indicator ind,
2523                   struct ib_sge *sge)
2524 {
2525         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2526         struct ib_mr *mr;
2527         struct ib_fast_reg_page_list *frpl;
2528         struct ib_send_wr fr_wr, inv_wr;
2529         struct ib_send_wr *bad_wr, *wr = NULL;
2530         int ret, pagelist_len;
2531         u32 page_off;
2532         u8 key;
2533
2534         if (mem->dma_nents == 1) {
2535                 sge->lkey = isert_conn->conn_mr->lkey;
2536                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2537                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2538                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2539                          __func__, __LINE__, sge->addr, sge->length,
2540                          sge->lkey);
2541                 return 0;
2542         }
2543
2544         if (ind == ISERT_DATA_KEY_VALID) {
2545                 /* Registering data buffer */
2546                 mr = fr_desc->data_mr;
2547                 frpl = fr_desc->data_frpl;
2548         } else {
2549                 /* Registering protection buffer */
2550                 mr = fr_desc->pi_ctx->prot_mr;
2551                 frpl = fr_desc->pi_ctx->prot_frpl;
2552         }
2553
2554         page_off = mem->offset % PAGE_SIZE;
2555
2556         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2557                  fr_desc, mem->nents, mem->offset);
2558
2559         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2560                                              &frpl->page_list[0]);
2561
2562         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2563                 memset(&inv_wr, 0, sizeof(inv_wr));
2564                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2565                 inv_wr.opcode = IB_WR_LOCAL_INV;
2566                 inv_wr.ex.invalidate_rkey = mr->rkey;
2567                 wr = &inv_wr;
2568                 /* Bump the key */
2569                 key = (u8)(mr->rkey & 0x000000FF);
2570                 ib_update_fast_reg_key(mr, ++key);
2571         }
2572
2573         /* Prepare FASTREG WR */
2574         memset(&fr_wr, 0, sizeof(fr_wr));
2575         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2576         fr_wr.opcode = IB_WR_FAST_REG_MR;
2577         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2578         fr_wr.wr.fast_reg.page_list = frpl;
2579         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2580         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2581         fr_wr.wr.fast_reg.length = mem->len;
2582         fr_wr.wr.fast_reg.rkey = mr->rkey;
2583         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2584
2585         if (!wr)
2586                 wr = &fr_wr;
2587         else
2588                 wr->next = &fr_wr;
2589
2590         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2591         if (ret) {
2592                 pr_err("fast registration failed, ret:%d\n", ret);
2593                 return ret;
2594         }
2595         fr_desc->ind &= ~ind;
2596
2597         sge->lkey = mr->lkey;
2598         sge->addr = frpl->page_list[0] + page_off;
2599         sge->length = mem->len;
2600
2601         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2602                  __func__, __LINE__, sge->addr, sge->length,
2603                  sge->lkey);
2604
2605         return ret;
2606 }
2607
2608 static inline enum ib_t10_dif_type
2609 se2ib_prot_type(enum target_prot_type prot_type)
2610 {
2611         switch (prot_type) {
2612         case TARGET_DIF_TYPE0_PROT:
2613                 return IB_T10DIF_NONE;
2614         case TARGET_DIF_TYPE1_PROT:
2615                 return IB_T10DIF_TYPE1;
2616         case TARGET_DIF_TYPE2_PROT:
2617                 return IB_T10DIF_TYPE2;
2618         case TARGET_DIF_TYPE3_PROT:
2619                 return IB_T10DIF_TYPE3;
2620         default:
2621                 return IB_T10DIF_NONE;
2622         }
2623 }
2624
2625 static int
2626 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2627 {
2628         enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2629
2630         sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2631         sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2632         sig_attrs->mem.sig.dif.pi_interval =
2633                                 se_cmd->se_dev->dev_attrib.block_size;
2634         sig_attrs->wire.sig.dif.pi_interval =
2635                                 se_cmd->se_dev->dev_attrib.block_size;
2636
2637         switch (se_cmd->prot_op) {
2638         case TARGET_PROT_DIN_INSERT:
2639         case TARGET_PROT_DOUT_STRIP:
2640                 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2641                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2642                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2643                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2644                 break;
2645         case TARGET_PROT_DOUT_INSERT:
2646         case TARGET_PROT_DIN_STRIP:
2647                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2648                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2649                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2650                 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2651                 break;
2652         case TARGET_PROT_DIN_PASS:
2653         case TARGET_PROT_DOUT_PASS:
2654                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2655                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2656                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2657                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2658                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2659                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2660                 break;
2661         default:
2662                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2663                 return -EINVAL;
2664         }
2665
2666         return 0;
2667 }
2668
2669 static inline u8
2670 isert_set_prot_checks(u8 prot_checks)
2671 {
2672         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2673                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2674                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2675 }
2676
2677 static int
2678 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2679                  struct fast_reg_descriptor *fr_desc,
2680                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2681                  struct ib_sge *sig_sge)
2682 {
2683         struct ib_send_wr sig_wr, inv_wr;
2684         struct ib_send_wr *bad_wr, *wr = NULL;
2685         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2686         struct ib_sig_attrs sig_attrs;
2687         int ret;
2688         u32 key;
2689
2690         memset(&sig_attrs, 0, sizeof(sig_attrs));
2691         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2692         if (ret)
2693                 goto err;
2694
2695         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2696
2697         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2698                 memset(&inv_wr, 0, sizeof(inv_wr));
2699                 inv_wr.opcode = IB_WR_LOCAL_INV;
2700                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2701                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2702                 wr = &inv_wr;
2703                 /* Bump the key */
2704                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2705                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2706         }
2707
2708         memset(&sig_wr, 0, sizeof(sig_wr));
2709         sig_wr.opcode = IB_WR_REG_SIG_MR;
2710         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2711         sig_wr.sg_list = data_sge;
2712         sig_wr.num_sge = 1;
2713         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2714         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2715         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2716         if (se_cmd->t_prot_sg)
2717                 sig_wr.wr.sig_handover.prot = prot_sge;
2718
2719         if (!wr)
2720                 wr = &sig_wr;
2721         else
2722                 wr->next = &sig_wr;
2723
2724         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2725         if (ret) {
2726                 pr_err("fast registration failed, ret:%d\n", ret);
2727                 goto err;
2728         }
2729         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2730
2731         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2732         sig_sge->addr = 0;
2733         sig_sge->length = se_cmd->data_length;
2734         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2735             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2736                 /*
2737                  * We have protection guards on the wire
2738                  * so we need to set a larget transfer
2739                  */
2740                 sig_sge->length += se_cmd->prot_length;
2741
2742         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2743                  sig_sge->addr, sig_sge->length,
2744                  sig_sge->lkey);
2745 err:
2746         return ret;
2747 }
2748
2749 static int
2750 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2751                struct isert_rdma_wr *wr)
2752 {
2753         struct se_cmd *se_cmd = &cmd->se_cmd;
2754         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2755         struct isert_conn *isert_conn = conn->context;
2756         struct ib_sge data_sge;
2757         struct ib_send_wr *send_wr;
2758         struct fast_reg_descriptor *fr_desc = NULL;
2759         u32 offset;
2760         int ret = 0;
2761         unsigned long flags;
2762
2763         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2764
2765         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2766         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2767                                  se_cmd->t_data_nents, se_cmd->data_length,
2768                                  offset, wr->iser_ib_op, &wr->data);
2769         if (ret)
2770                 return ret;
2771
2772         if (wr->data.dma_nents != 1 ||
2773             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2774                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2775                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2776                                            struct fast_reg_descriptor, list);
2777                 list_del(&fr_desc->list);
2778                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2779                 wr->fr_desc = fr_desc;
2780         }
2781
2782         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2783                                 ISERT_DATA_KEY_VALID, &data_sge);
2784         if (ret)
2785                 goto unmap_cmd;
2786
2787         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2788                 struct ib_sge prot_sge, sig_sge;
2789
2790                 if (se_cmd->t_prot_sg) {
2791                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2792                                                  se_cmd->t_prot_sg,
2793                                                  se_cmd->t_prot_nents,
2794                                                  se_cmd->prot_length,
2795                                                  0, wr->iser_ib_op, &wr->prot);
2796                         if (ret)
2797                                 goto unmap_cmd;
2798
2799                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2800                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2801                         if (ret)
2802                                 goto unmap_prot_cmd;
2803                 }
2804
2805                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2806                                        &data_sge, &prot_sge, &sig_sge);
2807                 if (ret)
2808                         goto unmap_prot_cmd;
2809
2810                 fr_desc->ind |= ISERT_PROTECTED;
2811                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2812         } else
2813                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2814
2815         wr->ib_sge = &wr->s_ib_sge;
2816         wr->send_wr_num = 1;
2817         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2818         wr->send_wr = &wr->s_send_wr;
2819         wr->isert_cmd = isert_cmd;
2820
2821         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2822         send_wr->sg_list = &wr->s_ib_sge;
2823         send_wr->num_sge = 1;
2824         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2825         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2826                 send_wr->opcode = IB_WR_RDMA_WRITE;
2827                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2828                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2829                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2830                                       0 : IB_SEND_SIGNALED;
2831         } else {
2832                 send_wr->opcode = IB_WR_RDMA_READ;
2833                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2834                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2835                 send_wr->send_flags = IB_SEND_SIGNALED;
2836         }
2837
2838         return 0;
2839 unmap_prot_cmd:
2840         if (se_cmd->t_prot_sg)
2841                 isert_unmap_data_buf(isert_conn, &wr->prot);
2842 unmap_cmd:
2843         if (fr_desc) {
2844                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2845                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2846                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2847         }
2848         isert_unmap_data_buf(isert_conn, &wr->data);
2849
2850         return ret;
2851 }
2852
2853 static int
2854 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2855 {
2856         struct se_cmd *se_cmd = &cmd->se_cmd;
2857         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2858         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2859         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2860         struct isert_device *device = isert_conn->conn_device;
2861         struct ib_send_wr *wr_failed;
2862         int rc;
2863
2864         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2865                  isert_cmd, se_cmd->data_length);
2866         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2867         rc = device->reg_rdma_mem(conn, cmd, wr);
2868         if (rc) {
2869                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2870                 return rc;
2871         }
2872
2873         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2874                 /*
2875                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2876                  */
2877                 isert_create_send_desc(isert_conn, isert_cmd,
2878                                        &isert_cmd->tx_desc);
2879                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2880                                      &isert_cmd->tx_desc.iscsi_header);
2881                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2882                 isert_init_send_wr(isert_conn, isert_cmd,
2883                                    &isert_cmd->tx_desc.send_wr, true);
2884                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2885                 wr->send_wr_num += 1;
2886         }
2887
2888         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2889
2890         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2891         if (rc) {
2892                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2893                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2894         }
2895
2896         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2897                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2898                          "READ\n", isert_cmd);
2899         else
2900                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2901                          isert_cmd);
2902
2903         return 1;
2904 }
2905
2906 static int
2907 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2908 {
2909         struct se_cmd *se_cmd = &cmd->se_cmd;
2910         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2911         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2912         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2913         struct isert_device *device = isert_conn->conn_device;
2914         struct ib_send_wr *wr_failed;
2915         int rc;
2916
2917         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2918                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2919         wr->iser_ib_op = ISER_IB_RDMA_READ;
2920         rc = device->reg_rdma_mem(conn, cmd, wr);
2921         if (rc) {
2922                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2923                 return rc;
2924         }
2925
2926         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2927
2928         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2929         if (rc) {
2930                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2931                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2932         }
2933         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2934                  isert_cmd);
2935
2936         return 0;
2937 }
2938
2939 static int
2940 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2941 {
2942         int ret;
2943
2944         switch (state) {
2945         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2946                 ret = isert_put_nopin(cmd, conn, false);
2947                 break;
2948         default:
2949                 pr_err("Unknown immediate state: 0x%02x\n", state);
2950                 ret = -EINVAL;
2951                 break;
2952         }
2953
2954         return ret;
2955 }
2956
2957 static int
2958 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2959 {
2960         int ret;
2961
2962         switch (state) {
2963         case ISTATE_SEND_LOGOUTRSP:
2964                 ret = isert_put_logout_rsp(cmd, conn);
2965                 if (!ret) {
2966                         pr_debug("Returning iSER Logout -EAGAIN\n");
2967                         ret = -EAGAIN;
2968                 }
2969                 break;
2970         case ISTATE_SEND_NOPIN:
2971                 ret = isert_put_nopin(cmd, conn, true);
2972                 break;
2973         case ISTATE_SEND_TASKMGTRSP:
2974                 ret = isert_put_tm_rsp(cmd, conn);
2975                 break;
2976         case ISTATE_SEND_REJECT:
2977                 ret = isert_put_reject(cmd, conn);
2978                 break;
2979         case ISTATE_SEND_TEXTRSP:
2980                 ret = isert_put_text_rsp(cmd, conn);
2981                 break;
2982         case ISTATE_SEND_STATUS:
2983                 /*
2984                  * Special case for sending non GOOD SCSI status from TX thread
2985                  * context during pre se_cmd excecution failure.
2986                  */
2987                 ret = isert_put_response(conn, cmd);
2988                 break;
2989         default:
2990                 pr_err("Unknown response state: 0x%02x\n", state);
2991                 ret = -EINVAL;
2992                 break;
2993         }
2994
2995         return ret;
2996 }
2997
2998 static int
2999 isert_setup_np(struct iscsi_np *np,
3000                struct __kernel_sockaddr_storage *ksockaddr)
3001 {
3002         struct isert_np *isert_np;
3003         struct rdma_cm_id *isert_lid;
3004         struct sockaddr *sa;
3005         int ret;
3006
3007         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3008         if (!isert_np) {
3009                 pr_err("Unable to allocate struct isert_np\n");
3010                 return -ENOMEM;
3011         }
3012         sema_init(&isert_np->np_sem, 0);
3013         mutex_init(&isert_np->np_accept_mutex);
3014         INIT_LIST_HEAD(&isert_np->np_accept_list);
3015         init_completion(&isert_np->np_login_comp);
3016
3017         sa = (struct sockaddr *)ksockaddr;
3018         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3019         /*
3020          * Setup the np->np_sockaddr from the passed sockaddr setup
3021          * in iscsi_target_configfs.c code..
3022          */
3023         memcpy(&np->np_sockaddr, ksockaddr,
3024                sizeof(struct __kernel_sockaddr_storage));
3025
3026         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3027                                 IB_QPT_RC);
3028         if (IS_ERR(isert_lid)) {
3029                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3030                        PTR_ERR(isert_lid));
3031                 ret = PTR_ERR(isert_lid);
3032                 goto out;
3033         }
3034
3035         ret = rdma_bind_addr(isert_lid, sa);
3036         if (ret) {
3037                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3038                 goto out_lid;
3039         }
3040
3041         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3042         if (ret) {
3043                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3044                 goto out_lid;
3045         }
3046
3047         isert_np->np_cm_id = isert_lid;
3048         np->np_context = isert_np;
3049         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3050
3051         return 0;
3052
3053 out_lid:
3054         rdma_destroy_id(isert_lid);
3055 out:
3056         kfree(isert_np);
3057         return ret;
3058 }
3059
3060 static int
3061 isert_rdma_accept(struct isert_conn *isert_conn)
3062 {
3063         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3064         struct rdma_conn_param cp;
3065         int ret;
3066
3067         memset(&cp, 0, sizeof(struct rdma_conn_param));
3068         cp.responder_resources = isert_conn->responder_resources;
3069         cp.initiator_depth = isert_conn->initiator_depth;
3070         cp.retry_count = 7;
3071         cp.rnr_retry_count = 7;
3072
3073         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3074
3075         ret = rdma_accept(cm_id, &cp);
3076         if (ret) {
3077                 pr_err("rdma_accept() failed with: %d\n", ret);
3078                 return ret;
3079         }
3080
3081         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3082
3083         return 0;
3084 }
3085
3086 static int
3087 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3088 {
3089         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3090         int ret;
3091
3092         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3093         /*
3094          * For login requests after the first PDU, isert_rx_login_req() will
3095          * kick schedule_delayed_work(&conn->login_work) as the packet is
3096          * received, which turns this callback from iscsi_target_do_login_rx()
3097          * into a NOP.
3098          */
3099         if (!login->first_request)
3100                 return 0;
3101
3102         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3103         if (ret)
3104                 return ret;
3105
3106         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3107         return 0;
3108 }
3109
3110 static void
3111 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3112                     struct isert_conn *isert_conn)
3113 {
3114         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3115         struct rdma_route *cm_route = &cm_id->route;
3116         struct sockaddr_in *sock_in;
3117         struct sockaddr_in6 *sock_in6;
3118
3119         conn->login_family = np->np_sockaddr.ss_family;
3120
3121         if (np->np_sockaddr.ss_family == AF_INET6) {
3122                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3123                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3124                          &sock_in6->sin6_addr.in6_u);
3125                 conn->login_port = ntohs(sock_in6->sin6_port);
3126
3127                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3128                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3129                          &sock_in6->sin6_addr.in6_u);
3130                 conn->local_port = ntohs(sock_in6->sin6_port);
3131         } else {
3132                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3133                 sprintf(conn->login_ip, "%pI4",
3134                         &sock_in->sin_addr.s_addr);
3135                 conn->login_port = ntohs(sock_in->sin_port);
3136
3137                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3138                 sprintf(conn->local_ip, "%pI4",
3139                         &sock_in->sin_addr.s_addr);
3140                 conn->local_port = ntohs(sock_in->sin_port);
3141         }
3142 }
3143
3144 static int
3145 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3146 {
3147         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3148         struct isert_conn *isert_conn;
3149         int max_accept = 0, ret;
3150
3151 accept_wait:
3152         ret = down_interruptible(&isert_np->np_sem);
3153         if (max_accept > 5)
3154                 return -ENODEV;
3155
3156         spin_lock_bh(&np->np_thread_lock);
3157         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
3158                 spin_unlock_bh(&np->np_thread_lock);
3159                 pr_debug("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
3160                 return -ENODEV;
3161         }
3162         spin_unlock_bh(&np->np_thread_lock);
3163
3164         mutex_lock(&isert_np->np_accept_mutex);
3165         if (list_empty(&isert_np->np_accept_list)) {
3166                 mutex_unlock(&isert_np->np_accept_mutex);
3167                 max_accept++;
3168                 goto accept_wait;
3169         }
3170         isert_conn = list_first_entry(&isert_np->np_accept_list,
3171                         struct isert_conn, conn_accept_node);
3172         list_del_init(&isert_conn->conn_accept_node);
3173         mutex_unlock(&isert_np->np_accept_mutex);
3174
3175         conn->context = isert_conn;
3176         isert_conn->conn = conn;
3177         max_accept = 0;
3178
3179         ret = isert_rdma_post_recvl(isert_conn);
3180         if (ret)
3181                 return ret;
3182
3183         ret = isert_rdma_accept(isert_conn);
3184         if (ret)
3185                 return ret;
3186
3187         isert_set_conn_info(np, conn, isert_conn);
3188
3189         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3190         return 0;
3191 }
3192
3193 static void
3194 isert_free_np(struct iscsi_np *np)
3195 {
3196         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3197
3198         rdma_destroy_id(isert_np->np_cm_id);
3199
3200         np->np_context = NULL;
3201         kfree(isert_np);
3202 }
3203
3204 static void isert_wait_conn(struct iscsi_conn *conn)
3205 {
3206         struct isert_conn *isert_conn = conn->context;
3207
3208         pr_debug("isert_wait_conn: Starting \n");
3209         /*
3210          * Decrement post_send_buf_count for special case when called
3211          * from isert_do_control_comp() -> iscsit_logout_post_handler()
3212          */
3213         mutex_lock(&isert_conn->conn_mutex);
3214         if (isert_conn->logout_posted)
3215                 atomic_dec(&isert_conn->post_send_buf_count);
3216
3217         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
3218                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3219                 rdma_disconnect(isert_conn->conn_cm_id);
3220         }
3221         /*
3222          * Only wait for conn_wait_comp_err if the isert_conn made it
3223          * into full feature phase..
3224          */
3225         if (isert_conn->state == ISER_CONN_INIT) {
3226                 mutex_unlock(&isert_conn->conn_mutex);
3227                 return;
3228         }
3229         if (isert_conn->state == ISER_CONN_UP)
3230                 isert_conn->state = ISER_CONN_TERMINATING;
3231         mutex_unlock(&isert_conn->conn_mutex);
3232
3233         wait_for_completion(&isert_conn->conn_wait_comp_err);
3234
3235         wait_for_completion(&isert_conn->conn_wait);
3236 }
3237
3238 static void isert_free_conn(struct iscsi_conn *conn)
3239 {
3240         struct isert_conn *isert_conn = conn->context;
3241
3242         isert_put_conn(isert_conn);
3243 }
3244
3245 static struct iscsit_transport iser_target_transport = {
3246         .name                   = "IB/iSER",
3247         .transport_type         = ISCSI_INFINIBAND,
3248         .priv_size              = sizeof(struct isert_cmd),
3249         .owner                  = THIS_MODULE,
3250         .iscsit_setup_np        = isert_setup_np,
3251         .iscsit_accept_np       = isert_accept_np,
3252         .iscsit_free_np         = isert_free_np,
3253         .iscsit_wait_conn       = isert_wait_conn,
3254         .iscsit_free_conn       = isert_free_conn,
3255         .iscsit_get_login_rx    = isert_get_login_rx,
3256         .iscsit_put_login_tx    = isert_put_login_tx,
3257         .iscsit_immediate_queue = isert_immediate_queue,
3258         .iscsit_response_queue  = isert_response_queue,
3259         .iscsit_get_dataout     = isert_get_dataout,
3260         .iscsit_queue_data_in   = isert_put_datain,
3261         .iscsit_queue_status    = isert_put_response,
3262         .iscsit_aborted_task    = isert_aborted_task,
3263         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3264 };
3265
3266 static int __init isert_init(void)
3267 {
3268         int ret;
3269
3270         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3271         if (!isert_rx_wq) {
3272                 pr_err("Unable to allocate isert_rx_wq\n");
3273                 return -ENOMEM;
3274         }
3275
3276         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3277         if (!isert_comp_wq) {
3278                 pr_err("Unable to allocate isert_comp_wq\n");
3279                 ret = -ENOMEM;
3280                 goto destroy_rx_wq;
3281         }
3282
3283         iscsit_register_transport(&iser_target_transport);
3284         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3285         return 0;
3286
3287 destroy_rx_wq:
3288         destroy_workqueue(isert_rx_wq);
3289         return ret;
3290 }
3291
3292 static void __exit isert_exit(void)
3293 {
3294         destroy_workqueue(isert_comp_wq);
3295         destroy_workqueue(isert_rx_wq);
3296         iscsit_unregister_transport(&iser_target_transport);
3297         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3298 }
3299
3300 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3301 MODULE_VERSION("0.1");
3302 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3303 MODULE_LICENSE("GPL");
3304
3305 module_init(isert_init);
3306 module_exit(isert_exit);