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