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