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 <rdma/ib_verbs.h>
  26 #include <rdma/rdma_cm.h>
  27 #include <target/target_core_base.h>
  28 #include <target/target_core_fabric.h>
  29 #include <target/iscsi/iscsi_transport.h>
  30
  31 #include "isert_proto.h"
  32 #include "ib_isert.h"
  33
  34 #define ISERT_MAX_CONN          8
  35 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  36 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  37
  38 static DEFINE_MUTEX(device_list_mutex);
  39 static LIST_HEAD(device_list);
  40 static struct workqueue_struct *isert_rx_wq;
  41 static struct workqueue_struct *isert_comp_wq;
  42
  43 static void
  44 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  45 static int
  46 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  47                struct isert_rdma_wr *wr);
  48 static void
  49 isert_unreg_rdma_frwr(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  50 static int
  51 isert_reg_rdma_frwr(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  52                     struct isert_rdma_wr *wr);
  53
  54 static void
  55 isert_qp_event_callback(struct ib_event *e, void *context)
  56 {
  57         struct isert_conn *isert_conn = (struct isert_conn *)context;
  58
  59         pr_err("isert_qp_event_callback event: %d\n", e->event);
  60         switch (e->event) {
  61         case IB_EVENT_COMM_EST:
  62                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  63                 break;
  64         case IB_EVENT_QP_LAST_WQE_REACHED:
  65                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  66                 break;
  67         default:
  68                 break;
  69         }
  70 }
  71
  72 static int
  73 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  74 {
  75         int ret;
  76
  77         ret = ib_query_device(ib_dev, devattr);
  78         if (ret) {
  79                 pr_err("ib_query_device() failed: %d\n", ret);
  80                 return ret;
  81         }
  82         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  83         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  84
  85         return 0;
  86 }
  87
  88 static int
  89 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
  90 {
  91         struct isert_device *device = isert_conn->conn_device;
  92         struct ib_qp_init_attr attr;
  93         int ret, index, min_index = 0;
  94
  95         mutex_lock(&device_list_mutex);
  96         for (index = 0; index < device->cqs_used; index++)
  97                 if (device->cq_active_qps[index] <
  98                     device->cq_active_qps[min_index])
  99                         min_index = index;
 100         device->cq_active_qps[min_index]++;
 101         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 102         mutex_unlock(&device_list_mutex);
 103
 104         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 105         attr.event_handler = isert_qp_event_callback;
 106         attr.qp_context = isert_conn;
 107         attr.send_cq = device->dev_tx_cq[min_index];
 108         attr.recv_cq = device->dev_rx_cq[min_index];
 109         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 110         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 111         /*
 112          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 113          * work-around for RDMA_READ..
 114          */
 115         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 116         isert_conn->max_sge = attr.cap.max_send_sge;
 117
 118         attr.cap.max_recv_sge = 1;
 119         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 120         attr.qp_type = IB_QPT_RC;
 121
 122         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 123                  cma_id->device);
 124         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 125                  isert_conn->conn_pd->device);
 126
 127         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 128         if (ret) {
 129                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 130                 return ret;
 131         }
 132         isert_conn->conn_qp = cma_id->qp;
 133         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 134
 135         return 0;
 136 }
 137
 138 static void
 139 isert_cq_event_callback(struct ib_event *e, void *context)
 140 {
 141         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 142 }
 143
 144 static int
 145 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 146 {
 147         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 148         struct iser_rx_desc *rx_desc;
 149         struct ib_sge *rx_sg;
 150         u64 dma_addr;
 151         int i, j;
 152
 153         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 154                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 155         if (!isert_conn->conn_rx_descs)
 156                 goto fail;
 157
 158         rx_desc = isert_conn->conn_rx_descs;
 159
 160         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 161                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 162                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 163                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 164                         goto dma_map_fail;
 165
 166                 rx_desc->dma_addr = dma_addr;
 167
 168                 rx_sg = &rx_desc->rx_sg;
 169                 rx_sg->addr = rx_desc->dma_addr;
 170                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 171                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 172         }
 173
 174         isert_conn->conn_rx_desc_head = 0;
 175         return 0;
 176
 177 dma_map_fail:
 178         rx_desc = isert_conn->conn_rx_descs;
 179         for (j = 0; j < i; j++, rx_desc++) {
 180                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 181                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 182         }
 183         kfree(isert_conn->conn_rx_descs);
 184         isert_conn->conn_rx_descs = NULL;
 185 fail:
 186         return -ENOMEM;
 187 }
 188
 189 static void
 190 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 191 {
 192         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 193         struct iser_rx_desc *rx_desc;
 194         int i;
 195
 196         if (!isert_conn->conn_rx_descs)
 197                 return;
 198
 199         rx_desc = isert_conn->conn_rx_descs;
 200         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 201                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 202                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 203         }
 204
 205         kfree(isert_conn->conn_rx_descs);
 206         isert_conn->conn_rx_descs = NULL;
 207 }
 208
 209 static void isert_cq_tx_callback(struct ib_cq *, void *);
 210 static void isert_cq_rx_callback(struct ib_cq *, void *);
 211
 212 static int
 213 isert_create_device_ib_res(struct isert_device *device)
 214 {
 215         struct ib_device *ib_dev = device->ib_device;
 216         struct isert_cq_desc *cq_desc;
 217         struct ib_device_attr *dev_attr;
 218         int ret = 0, i, j;
 219
 220         dev_attr = &device->dev_attr;
 221         ret = isert_query_device(ib_dev, dev_attr);
 222         if (ret)
 223                 return ret;
 224
 225         /* asign function handlers */
 226         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
 227                 device->use_frwr = 1;
 228                 device->reg_rdma_mem = isert_reg_rdma_frwr;
 229                 device->unreg_rdma_mem = isert_unreg_rdma_frwr;
 230         } else {
 231                 device->use_frwr = 0;
 232                 device->reg_rdma_mem = isert_map_rdma;
 233                 device->unreg_rdma_mem = isert_unmap_cmd;
 234         }
 235
 236         device->cqs_used = min_t(int, num_online_cpus(),
 237                                  device->ib_device->num_comp_vectors);
 238         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 239         pr_debug("Using %d CQs, device %s supports %d vectors support FRWR %d\n",
 240                  device->cqs_used, device->ib_device->name,
 241                  device->ib_device->num_comp_vectors, device->use_frwr);
 242         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 243                                 device->cqs_used, GFP_KERNEL);
 244         if (!device->cq_desc) {
 245                 pr_err("Unable to allocate device->cq_desc\n");
 246                 return -ENOMEM;
 247         }
 248         cq_desc = device->cq_desc;
 249
 250         device->dev_pd = ib_alloc_pd(ib_dev);
 251         if (IS_ERR(device->dev_pd)) {
 252                 ret = PTR_ERR(device->dev_pd);
 253                 pr_err("ib_alloc_pd failed for dev_pd: %d\n", ret);
 254                 goto out_cq_desc;
 255         }
 256
 257         for (i = 0; i < device->cqs_used; i++) {
 258                 cq_desc[i].device = device;
 259                 cq_desc[i].cq_index = i;
 260
 261                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 262                                                 isert_cq_rx_callback,
 263                                                 isert_cq_event_callback,
 264                                                 (void *)&cq_desc[i],
 265                                                 ISER_MAX_RX_CQ_LEN, i);
 266                 if (IS_ERR(device->dev_rx_cq[i]))
 267                         goto out_cq;
 268
 269                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 270                                                 isert_cq_tx_callback,
 271                                                 isert_cq_event_callback,
 272                                                 (void *)&cq_desc[i],
 273                                                 ISER_MAX_TX_CQ_LEN, i);
 274                 if (IS_ERR(device->dev_tx_cq[i]))
 275                         goto out_cq;
 276
 277                 if (ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP))
 278                         goto out_cq;
 279
 280                 if (ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP))
 281                         goto out_cq;
 282         }
 283
 284         device->dev_mr = ib_get_dma_mr(device->dev_pd, IB_ACCESS_LOCAL_WRITE);
 285         if (IS_ERR(device->dev_mr)) {
 286                 ret = PTR_ERR(device->dev_mr);
 287                 pr_err("ib_get_dma_mr failed for dev_mr: %d\n", 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         ib_dealloc_pd(device->dev_pd);
 307
 308 out_cq_desc:
 309         kfree(device->cq_desc);
 310
 311         return ret;
 312 }
 313
 314 static void
 315 isert_free_device_ib_res(struct isert_device *device)
 316 {
 317         struct isert_cq_desc *cq_desc;
 318         int i;
 319
 320         for (i = 0; i < device->cqs_used; i++) {
 321                 cq_desc = &device->cq_desc[i];
 322
 323                 cancel_work_sync(&cq_desc->cq_rx_work);
 324                 cancel_work_sync(&cq_desc->cq_tx_work);
 325                 ib_destroy_cq(device->dev_rx_cq[i]);
 326                 ib_destroy_cq(device->dev_tx_cq[i]);
 327                 device->dev_rx_cq[i] = NULL;
 328                 device->dev_tx_cq[i] = NULL;
 329         }
 330
 331         ib_dereg_mr(device->dev_mr);
 332         ib_dealloc_pd(device->dev_pd);
 333         kfree(device->cq_desc);
 334 }
 335
 336 static void
 337 isert_device_try_release(struct isert_device *device)
 338 {
 339         mutex_lock(&device_list_mutex);
 340         device->refcount--;
 341         if (!device->refcount) {
 342                 isert_free_device_ib_res(device);
 343                 list_del(&device->dev_node);
 344                 kfree(device);
 345         }
 346         mutex_unlock(&device_list_mutex);
 347 }
 348
 349 static struct isert_device *
 350 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 351 {
 352         struct isert_device *device;
 353         int ret;
 354
 355         mutex_lock(&device_list_mutex);
 356         list_for_each_entry(device, &device_list, dev_node) {
 357                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 358                         device->refcount++;
 359                         mutex_unlock(&device_list_mutex);
 360                         return device;
 361                 }
 362         }
 363
 364         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 365         if (!device) {
 366                 mutex_unlock(&device_list_mutex);
 367                 return ERR_PTR(-ENOMEM);
 368         }
 369
 370         INIT_LIST_HEAD(&device->dev_node);
 371
 372         device->ib_device = cma_id->device;
 373         ret = isert_create_device_ib_res(device);
 374         if (ret) {
 375                 kfree(device);
 376                 mutex_unlock(&device_list_mutex);
 377                 return ERR_PTR(ret);
 378         }
 379
 380         device->refcount++;
 381         list_add_tail(&device->dev_node, &device_list);
 382         mutex_unlock(&device_list_mutex);
 383
 384         return device;
 385 }
 386
 387 static void
 388 isert_conn_free_frwr_pool(struct isert_conn *isert_conn)
 389 {
 390         struct fast_reg_descriptor *fr_desc, *tmp;
 391         int i = 0;
 392
 393         if (list_empty(&isert_conn->conn_frwr_pool))
 394                 return;
 395
 396         pr_debug("Freeing conn %p frwr pool", isert_conn);
 397
 398         list_for_each_entry_safe(fr_desc, tmp,
 399                                  &isert_conn->conn_frwr_pool, list) {
 400                 list_del(&fr_desc->list);
 401                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 402                 ib_dereg_mr(fr_desc->data_mr);
 403                 kfree(fr_desc);
 404                 ++i;
 405         }
 406
 407         if (i < isert_conn->conn_frwr_pool_size)
 408                 pr_warn("Pool still has %d regions registered\n",
 409                         isert_conn->conn_frwr_pool_size - i);
 410 }
 411
 412 static int
 413 isert_conn_create_frwr_pool(struct isert_conn *isert_conn)
 414 {
 415         struct fast_reg_descriptor *fr_desc;
 416         struct isert_device *device = isert_conn->conn_device;
 417         int i, ret;
 418
 419         INIT_LIST_HEAD(&isert_conn->conn_frwr_pool);
 420         isert_conn->conn_frwr_pool_size = 0;
 421         for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
 422                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 423                 if (!fr_desc) {
 424                         pr_err("Failed to allocate fast_reg descriptor\n");
 425                         ret = -ENOMEM;
 426                         goto err;
 427                 }
 428
 429                 fr_desc->data_frpl =
 430                         ib_alloc_fast_reg_page_list(device->ib_device,
 431                                                     ISCSI_ISER_SG_TABLESIZE);
 432                 if (IS_ERR(fr_desc->data_frpl)) {
 433                         pr_err("Failed to allocate fr_pg_list err=%ld\n",
 434                                PTR_ERR(fr_desc->data_frpl));
 435                         ret = PTR_ERR(fr_desc->data_frpl);
 436                         goto err;
 437                 }
 438
 439                 fr_desc->data_mr = ib_alloc_fast_reg_mr(device->dev_pd,
 440                                         ISCSI_ISER_SG_TABLESIZE);
 441                 if (IS_ERR(fr_desc->data_mr)) {
 442                         pr_err("Failed to allocate frmr err=%ld\n",
 443                                PTR_ERR(fr_desc->data_mr));
 444                         ret = PTR_ERR(fr_desc->data_mr);
 445                         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 446                         goto err;
 447                 }
 448                 pr_debug("Create fr_desc %p page_list %p\n",
 449                          fr_desc, fr_desc->data_frpl->page_list);
 450
 451                 fr_desc->valid = true;
 452                 list_add_tail(&fr_desc->list, &isert_conn->conn_frwr_pool);
 453                 isert_conn->conn_frwr_pool_size++;
 454         }
 455
 456         pr_debug("Creating conn %p frwr pool size=%d",
 457                  isert_conn, isert_conn->conn_frwr_pool_size);
 458
 459         return 0;
 460
 461 err:
 462         isert_conn_free_frwr_pool(isert_conn);
 463         return ret;
 464 }
 465
 466 static int
 467 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 468 {
 469         struct iscsi_np *np = cma_id->context;
 470         struct isert_np *isert_np = np->np_context;
 471         struct isert_conn *isert_conn;
 472         struct isert_device *device;
 473         struct ib_device *ib_dev = cma_id->device;
 474         int ret = 0;
 475
 476         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 477                  cma_id, cma_id->context);
 478
 479         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 480         if (!isert_conn) {
 481                 pr_err("Unable to allocate isert_conn\n");
 482                 return -ENOMEM;
 483         }
 484         isert_conn->state = ISER_CONN_INIT;
 485         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 486         init_completion(&isert_conn->conn_login_comp);
 487         init_waitqueue_head(&isert_conn->conn_wait);
 488         init_waitqueue_head(&isert_conn->conn_wait_comp_err);
 489         kref_init(&isert_conn->conn_kref);
 490         kref_get(&isert_conn->conn_kref);
 491         mutex_init(&isert_conn->conn_mutex);
 492         spin_lock_init(&isert_conn->conn_lock);
 493
 494         cma_id->context = isert_conn;
 495         isert_conn->conn_cm_id = cma_id;
 496         isert_conn->responder_resources = event->param.conn.responder_resources;
 497         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 498         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 499                  isert_conn->responder_resources, isert_conn->initiator_depth);
 500
 501         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 502                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 503         if (!isert_conn->login_buf) {
 504                 pr_err("Unable to allocate isert_conn->login_buf\n");
 505                 ret = -ENOMEM;
 506                 goto out;
 507         }
 508
 509         isert_conn->login_req_buf = isert_conn->login_buf;
 510         isert_conn->login_rsp_buf = isert_conn->login_buf +
 511                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 512         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 513                  isert_conn->login_buf, isert_conn->login_req_buf,
 514                  isert_conn->login_rsp_buf);
 515
 516         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 517                                 (void *)isert_conn->login_req_buf,
 518                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 519
 520         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 521         if (ret) {
 522                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 523                        ret);
 524                 isert_conn->login_req_dma = 0;
 525                 goto out_login_buf;
 526         }
 527
 528         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 529                                         (void *)isert_conn->login_rsp_buf,
 530                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 531
 532         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 533         if (ret) {
 534                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 535                        ret);
 536                 isert_conn->login_rsp_dma = 0;
 537                 goto out_req_dma_map;
 538         }
 539
 540         device = isert_device_find_by_ib_dev(cma_id);
 541         if (IS_ERR(device)) {
 542                 ret = PTR_ERR(device);
 543                 goto out_rsp_dma_map;
 544         }
 545
 546         isert_conn->conn_device = device;
 547         isert_conn->conn_pd = device->dev_pd;
 548         isert_conn->conn_mr = device->dev_mr;
 549
 550         if (device->use_frwr) {
 551                 ret = isert_conn_create_frwr_pool(isert_conn);
 552                 if (ret) {
 553                         pr_err("Conn: %p failed to create frwr_pool\n", isert_conn);
 554                         goto out_frwr;
 555                 }
 556         }
 557
 558         ret = isert_conn_setup_qp(isert_conn, cma_id);
 559         if (ret)
 560                 goto out_conn_dev;
 561
 562         mutex_lock(&isert_np->np_accept_mutex);
 563         list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
 564         mutex_unlock(&isert_np->np_accept_mutex);
 565
 566         pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
 567         wake_up(&isert_np->np_accept_wq);
 568         return 0;
 569
 570 out_conn_dev:
 571         if (device->use_frwr)
 572                 isert_conn_free_frwr_pool(isert_conn);
 573 out_frwr:
 574         isert_device_try_release(device);
 575 out_rsp_dma_map:
 576         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 577                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 578 out_req_dma_map:
 579         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 580                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 581 out_login_buf:
 582         kfree(isert_conn->login_buf);
 583 out:
 584         kfree(isert_conn);
 585         return ret;
 586 }
 587
 588 static void
 589 isert_connect_release(struct isert_conn *isert_conn)
 590 {
 591         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 592         struct isert_device *device = isert_conn->conn_device;
 593         int cq_index;
 594
 595         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 596
 597         if (device && device->use_frwr)
 598                 isert_conn_free_frwr_pool(isert_conn);
 599
 600         if (isert_conn->conn_qp) {
 601                 cq_index = ((struct isert_cq_desc *)
 602                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 603                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 604                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 605
 606                 rdma_destroy_qp(isert_conn->conn_cm_id);
 607         }
 608
 609         isert_free_rx_descriptors(isert_conn);
 610         rdma_destroy_id(isert_conn->conn_cm_id);
 611
 612         if (isert_conn->login_buf) {
 613                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 614                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 615                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 616                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 617                                     DMA_FROM_DEVICE);
 618                 kfree(isert_conn->login_buf);
 619         }
 620         kfree(isert_conn);
 621
 622         if (device)
 623                 isert_device_try_release(device);
 624
 625         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 626 }
 627
 628 static void
 629 isert_connected_handler(struct rdma_cm_id *cma_id)
 630 {
 631         return;
 632 }
 633
 634 static void
 635 isert_release_conn_kref(struct kref *kref)
 636 {
 637         struct isert_conn *isert_conn = container_of(kref,
 638                                 struct isert_conn, conn_kref);
 639
 640         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 641                  current->comm, current->pid);
 642
 643         isert_connect_release(isert_conn);
 644 }
 645
 646 static void
 647 isert_put_conn(struct isert_conn *isert_conn)
 648 {
 649         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 650 }
 651
 652 static void
 653 isert_disconnect_work(struct work_struct *work)
 654 {
 655         struct isert_conn *isert_conn = container_of(work,
 656                                 struct isert_conn, conn_logout_work);
 657
 658         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 659         mutex_lock(&isert_conn->conn_mutex);
 660         isert_conn->state = ISER_CONN_DOWN;
 661
 662         if (isert_conn->post_recv_buf_count == 0 &&
 663             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 664                 pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
 665                 mutex_unlock(&isert_conn->conn_mutex);
 666                 goto wake_up;
 667         }
 668         if (!isert_conn->conn_cm_id) {
 669                 mutex_unlock(&isert_conn->conn_mutex);
 670                 isert_put_conn(isert_conn);
 671                 return;
 672         }
 673         if (!isert_conn->logout_posted) {
 674                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 675                          " isert_disconnect_work\n");
 676                 rdma_disconnect(isert_conn->conn_cm_id);
 677                 mutex_unlock(&isert_conn->conn_mutex);
 678                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 679                 goto wake_up;
 680         }
 681         mutex_unlock(&isert_conn->conn_mutex);
 682
 683 wake_up:
 684         wake_up(&isert_conn->conn_wait);
 685         isert_put_conn(isert_conn);
 686 }
 687
 688 static void
 689 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 690 {
 691         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 692
 693         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 694         schedule_work(&isert_conn->conn_logout_work);
 695 }
 696
 697 static int
 698 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 699 {
 700         int ret = 0;
 701
 702         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 703                  event->event, event->status, cma_id->context, cma_id);
 704
 705         switch (event->event) {
 706         case RDMA_CM_EVENT_CONNECT_REQUEST:
 707                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 708                 ret = isert_connect_request(cma_id, event);
 709                 break;
 710         case RDMA_CM_EVENT_ESTABLISHED:
 711                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 712                 isert_connected_handler(cma_id);
 713                 break;
 714         case RDMA_CM_EVENT_DISCONNECTED:
 715                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 716                 isert_disconnected_handler(cma_id);
 717                 break;
 718         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 719         case RDMA_CM_EVENT_ADDR_CHANGE:
 720                 break;
 721         case RDMA_CM_EVENT_CONNECT_ERROR:
 722         default:
 723                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 724                 break;
 725         }
 726
 727         if (ret != 0) {
 728                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 729                        event->event, ret);
 730                 dump_stack();
 731         }
 732
 733         return ret;
 734 }
 735
 736 static int
 737 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 738 {
 739         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 740         int i, ret;
 741         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 742         struct iser_rx_desc *rx_desc;
 743
 744         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 745                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 746                 rx_wr->wr_id    = (unsigned long)rx_desc;
 747                 rx_wr->sg_list  = &rx_desc->rx_sg;
 748                 rx_wr->num_sge  = 1;
 749                 rx_wr->next     = rx_wr + 1;
 750                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 751         }
 752
 753         rx_wr--;
 754         rx_wr->next = NULL; /* mark end of work requests list */
 755
 756         isert_conn->post_recv_buf_count += count;
 757         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 758                                 &rx_wr_failed);
 759         if (ret) {
 760                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 761                 isert_conn->post_recv_buf_count -= count;
 762         } else {
 763                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 764                 isert_conn->conn_rx_desc_head = rx_head;
 765         }
 766         return ret;
 767 }
 768
 769 static int
 770 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 771 {
 772         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 773         struct ib_send_wr send_wr, *send_wr_failed;
 774         int ret;
 775
 776         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 777                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 778
 779         send_wr.next    = NULL;
 780         send_wr.wr_id   = (unsigned long)tx_desc;
 781         send_wr.sg_list = tx_desc->tx_sg;
 782         send_wr.num_sge = tx_desc->num_sge;
 783         send_wr.opcode  = IB_WR_SEND;
 784         send_wr.send_flags = IB_SEND_SIGNALED;
 785
 786         atomic_inc(&isert_conn->post_send_buf_count);
 787
 788         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 789         if (ret) {
 790                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 791                 atomic_dec(&isert_conn->post_send_buf_count);
 792         }
 793
 794         return ret;
 795 }
 796
 797 static void
 798 isert_create_send_desc(struct isert_conn *isert_conn,
 799                        struct isert_cmd *isert_cmd,
 800                        struct iser_tx_desc *tx_desc)
 801 {
 802         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 803
 804         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 805                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 806
 807         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 808         tx_desc->iser_header.flags = ISER_VER;
 809
 810         tx_desc->num_sge = 1;
 811         tx_desc->isert_cmd = isert_cmd;
 812
 813         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 814                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 815                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 816         }
 817 }
 818
 819 static int
 820 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 821                    struct iser_tx_desc *tx_desc)
 822 {
 823         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 824         u64 dma_addr;
 825
 826         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 827                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 828         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 829                 pr_err("ib_dma_mapping_error() failed\n");
 830                 return -ENOMEM;
 831         }
 832
 833         tx_desc->dma_addr = dma_addr;
 834         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 835         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 836         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 837
 838         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 839                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 840                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 841
 842         return 0;
 843 }
 844
 845 static void
 846 isert_init_send_wr(struct isert_cmd *isert_cmd, struct ib_send_wr *send_wr)
 847 {
 848         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 849         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 850         send_wr->opcode = IB_WR_SEND;
 851         send_wr->send_flags = IB_SEND_SIGNALED;
 852         send_wr->sg_list = &isert_cmd->tx_desc.tx_sg[0];
 853         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 854 }
 855
 856 static int
 857 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 858 {
 859         struct ib_recv_wr rx_wr, *rx_wr_fail;
 860         struct ib_sge sge;
 861         int ret;
 862
 863         memset(&sge, 0, sizeof(struct ib_sge));
 864         sge.addr = isert_conn->login_req_dma;
 865         sge.length = ISER_RX_LOGIN_SIZE;
 866         sge.lkey = isert_conn->conn_mr->lkey;
 867
 868         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 869                 sge.addr, sge.length, sge.lkey);
 870
 871         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 872         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
 873         rx_wr.sg_list = &sge;
 874         rx_wr.num_sge = 1;
 875
 876         isert_conn->post_recv_buf_count++;
 877         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
 878         if (ret) {
 879                 pr_err("ib_post_recv() failed: %d\n", ret);
 880                 isert_conn->post_recv_buf_count--;
 881         }
 882
 883         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
 884         return ret;
 885 }
 886
 887 static int
 888 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 889                    u32 length)
 890 {
 891         struct isert_conn *isert_conn = conn->context;
 892         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 893         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
 894         int ret;
 895
 896         isert_create_send_desc(isert_conn, NULL, tx_desc);
 897
 898         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 899                sizeof(struct iscsi_hdr));
 900
 901         isert_init_tx_hdrs(isert_conn, tx_desc);
 902
 903         if (length > 0) {
 904                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 905
 906                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 907                                            length, DMA_TO_DEVICE);
 908
 909                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 910
 911                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 912                                               length, DMA_TO_DEVICE);
 913
 914                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 915                 tx_dsg->length  = length;
 916                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
 917                 tx_desc->num_sge = 2;
 918         }
 919         if (!login->login_failed) {
 920                 if (login->login_complete) {
 921                         ret = isert_alloc_rx_descriptors(isert_conn);
 922                         if (ret)
 923                                 return ret;
 924
 925                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
 926                         if (ret)
 927                                 return ret;
 928
 929                         isert_conn->state = ISER_CONN_UP;
 930                         goto post_send;
 931                 }
 932
 933                 ret = isert_rdma_post_recvl(isert_conn);
 934                 if (ret)
 935                         return ret;
 936         }
 937 post_send:
 938         ret = isert_post_send(isert_conn, tx_desc);
 939         if (ret)
 940                 return ret;
 941
 942         return 0;
 943 }
 944
 945 static void
 946 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
 947                    struct isert_conn *isert_conn)
 948 {
 949         struct iscsi_conn *conn = isert_conn->conn;
 950         struct iscsi_login *login = conn->conn_login;
 951         int size;
 952
 953         if (!login) {
 954                 pr_err("conn->conn_login is NULL\n");
 955                 dump_stack();
 956                 return;
 957         }
 958
 959         if (login->first_request) {
 960                 struct iscsi_login_req *login_req =
 961                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
 962                 /*
 963                  * Setup the initial iscsi_login values from the leading
 964                  * login request PDU.
 965                  */
 966                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
 967                 login->current_stage =
 968                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
 969                          >> 2;
 970                 login->version_min      = login_req->min_version;
 971                 login->version_max      = login_req->max_version;
 972                 memcpy(login->isid, login_req->isid, 6);
 973                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
 974                 login->init_task_tag    = login_req->itt;
 975                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
 976                 login->cid              = be16_to_cpu(login_req->cid);
 977                 login->tsih             = be16_to_cpu(login_req->tsih);
 978         }
 979
 980         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
 981
 982         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
 983         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
 984                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
 985         memcpy(login->req_buf, &rx_desc->data[0], size);
 986
 987         if (login->first_request) {
 988                 complete(&isert_conn->conn_login_comp);
 989                 return;
 990         }
 991         schedule_delayed_work(&conn->login_work, 0);
 992 }
 993
 994 static struct iscsi_cmd
 995 *isert_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp)
 996 {
 997         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
 998         struct isert_cmd *isert_cmd;
 999         struct iscsi_cmd *cmd;
1000
1001         cmd = iscsit_allocate_cmd(conn, gfp);
1002         if (!cmd) {
1003                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1004                 return NULL;
1005         }
1006         isert_cmd = iscsit_priv_cmd(cmd);
1007         isert_cmd->conn = isert_conn;
1008         isert_cmd->iscsi_cmd = cmd;
1009
1010         return cmd;
1011 }
1012
1013 static int
1014 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1015                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1016                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1017 {
1018         struct iscsi_conn *conn = isert_conn->conn;
1019         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1020         struct scatterlist *sg;
1021         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1022         bool dump_payload = false;
1023
1024         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1025         if (rc < 0)
1026                 return rc;
1027
1028         imm_data = cmd->immediate_data;
1029         imm_data_len = cmd->first_burst_len;
1030         unsol_data = cmd->unsolicited_data;
1031
1032         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1033         if (rc < 0) {
1034                 return 0;
1035         } else if (rc > 0) {
1036                 dump_payload = true;
1037                 goto sequence_cmd;
1038         }
1039
1040         if (!imm_data)
1041                 return 0;
1042
1043         sg = &cmd->se_cmd.t_data_sg[0];
1044         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1045
1046         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1047                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1048
1049         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1050
1051         cmd->write_data_done += imm_data_len;
1052
1053         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1054                 spin_lock_bh(&cmd->istate_lock);
1055                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1056                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1057                 spin_unlock_bh(&cmd->istate_lock);
1058         }
1059
1060 sequence_cmd:
1061         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1062
1063         if (!rc && dump_payload == false && unsol_data)
1064                 iscsit_set_unsoliticed_dataout(cmd);
1065
1066         return 0;
1067 }
1068
1069 static int
1070 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1071                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1072 {
1073         struct scatterlist *sg_start;
1074         struct iscsi_conn *conn = isert_conn->conn;
1075         struct iscsi_cmd *cmd = NULL;
1076         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1077         u32 unsol_data_len = ntoh24(hdr->dlength);
1078         int rc, sg_nents, sg_off, page_off;
1079
1080         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1081         if (rc < 0)
1082                 return rc;
1083         else if (!cmd)
1084                 return 0;
1085         /*
1086          * FIXME: Unexpected unsolicited_data out
1087          */
1088         if (!cmd->unsolicited_data) {
1089                 pr_err("Received unexpected solicited data payload\n");
1090                 dump_stack();
1091                 return -1;
1092         }
1093
1094         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1095                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1096
1097         sg_off = cmd->write_data_done / PAGE_SIZE;
1098         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1099         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1100         page_off = cmd->write_data_done % PAGE_SIZE;
1101         /*
1102          * FIXME: Non page-aligned unsolicited_data out
1103          */
1104         if (page_off) {
1105                 pr_err("Received unexpected non-page aligned data payload\n");
1106                 dump_stack();
1107                 return -1;
1108         }
1109         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1110                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1111
1112         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1113                             unsol_data_len);
1114
1115         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1116         if (rc < 0)
1117                 return rc;
1118
1119         return 0;
1120 }
1121
1122 static int
1123 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1124                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1125                      unsigned char *buf)
1126 {
1127         struct iscsi_conn *conn = isert_conn->conn;
1128         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1129         int rc;
1130
1131         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1132         if (rc < 0)
1133                 return rc;
1134         /*
1135          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1136          */
1137
1138         return iscsit_process_nop_out(conn, cmd, hdr);
1139 }
1140
1141 static int
1142 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1143                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1144                       struct iscsi_text *hdr)
1145 {
1146         struct iscsi_conn *conn = isert_conn->conn;
1147         u32 payload_length = ntoh24(hdr->dlength);
1148         int rc;
1149         unsigned char *text_in;
1150
1151         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1152         if (rc < 0)
1153                 return rc;
1154
1155         text_in = kzalloc(payload_length, GFP_KERNEL);
1156         if (!text_in) {
1157                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1158                        payload_length);
1159                 return -ENOMEM;
1160         }
1161         cmd->text_in_ptr = text_in;
1162
1163         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1164
1165         return iscsit_process_text_cmd(conn, cmd, hdr);
1166 }
1167
1168 static int
1169 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1170                 uint32_t read_stag, uint64_t read_va,
1171                 uint32_t write_stag, uint64_t write_va)
1172 {
1173         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1174         struct iscsi_conn *conn = isert_conn->conn;
1175         struct iscsi_session *sess = conn->sess;
1176         struct iscsi_cmd *cmd;
1177         struct isert_cmd *isert_cmd;
1178         int ret = -EINVAL;
1179         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1180
1181         if (sess->sess_ops->SessionType &&
1182            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1183                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1184                        " ignoring\n", opcode);
1185                 return 0;
1186         }
1187
1188         switch (opcode) {
1189         case ISCSI_OP_SCSI_CMD:
1190                 cmd = isert_allocate_cmd(conn, GFP_KERNEL);
1191                 if (!cmd)
1192                         break;
1193
1194                 isert_cmd = iscsit_priv_cmd(cmd);
1195                 isert_cmd->read_stag = read_stag;
1196                 isert_cmd->read_va = read_va;
1197                 isert_cmd->write_stag = write_stag;
1198                 isert_cmd->write_va = write_va;
1199
1200                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1201                                         rx_desc, (unsigned char *)hdr);
1202                 break;
1203         case ISCSI_OP_NOOP_OUT:
1204                 cmd = isert_allocate_cmd(conn, GFP_KERNEL);
1205                 if (!cmd)
1206                         break;
1207
1208                 isert_cmd = iscsit_priv_cmd(cmd);
1209                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1210                                            rx_desc, (unsigned char *)hdr);
1211                 break;
1212         case ISCSI_OP_SCSI_DATA_OUT:
1213                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1214                                                 (unsigned char *)hdr);
1215                 break;
1216         case ISCSI_OP_SCSI_TMFUNC:
1217                 cmd = isert_allocate_cmd(conn, GFP_KERNEL);
1218                 if (!cmd)
1219                         break;
1220
1221                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1222                                                 (unsigned char *)hdr);
1223                 break;
1224         case ISCSI_OP_LOGOUT:
1225                 cmd = isert_allocate_cmd(conn, GFP_KERNEL);
1226                 if (!cmd)
1227                         break;
1228
1229                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1230                 if (ret > 0)
1231                         wait_for_completion_timeout(&conn->conn_logout_comp,
1232                                                     SECONDS_FOR_LOGOUT_COMP *
1233                                                     HZ);
1234                 break;
1235         case ISCSI_OP_TEXT:
1236                 cmd = isert_allocate_cmd(conn, GFP_KERNEL);
1237                 if (!cmd)
1238                         break;
1239
1240                 isert_cmd = iscsit_priv_cmd(cmd);
1241                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1242                                             rx_desc, (struct iscsi_text *)hdr);
1243                 break;
1244         default:
1245                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1246                 dump_stack();
1247                 break;
1248         }
1249
1250         return ret;
1251 }
1252
1253 static void
1254 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1255 {
1256         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1257         uint64_t read_va = 0, write_va = 0;
1258         uint32_t read_stag = 0, write_stag = 0;
1259         int rc;
1260
1261         switch (iser_hdr->flags & 0xF0) {
1262         case ISCSI_CTRL:
1263                 if (iser_hdr->flags & ISER_RSV) {
1264                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1265                         read_va = be64_to_cpu(iser_hdr->read_va);
1266                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1267                                  read_stag, (unsigned long long)read_va);
1268                 }
1269                 if (iser_hdr->flags & ISER_WSV) {
1270                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1271                         write_va = be64_to_cpu(iser_hdr->write_va);
1272                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1273                                  write_stag, (unsigned long long)write_va);
1274                 }
1275
1276                 pr_debug("ISER ISCSI_CTRL PDU\n");
1277                 break;
1278         case ISER_HELLO:
1279                 pr_err("iSER Hello message\n");
1280                 break;
1281         default:
1282                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1283                 break;
1284         }
1285
1286         rc = isert_rx_opcode(isert_conn, rx_desc,
1287                              read_stag, read_va, write_stag, write_va);
1288 }
1289
1290 static void
1291 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1292                     unsigned long xfer_len)
1293 {
1294         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1295         struct iscsi_hdr *hdr;
1296         u64 rx_dma;
1297         int rx_buflen, outstanding;
1298
1299         if ((char *)desc == isert_conn->login_req_buf) {
1300                 rx_dma = isert_conn->login_req_dma;
1301                 rx_buflen = ISER_RX_LOGIN_SIZE;
1302                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1303                          rx_dma, rx_buflen);
1304         } else {
1305                 rx_dma = desc->dma_addr;
1306                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1307                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1308                          rx_dma, rx_buflen);
1309         }
1310
1311         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1312
1313         hdr = &desc->iscsi_header;
1314         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1315                  hdr->opcode, hdr->itt, hdr->flags,
1316                  (int)(xfer_len - ISER_HEADERS_LEN));
1317
1318         if ((char *)desc == isert_conn->login_req_buf)
1319                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1320                                    isert_conn);
1321         else
1322                 isert_rx_do_work(desc, isert_conn);
1323
1324         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1325                                       DMA_FROM_DEVICE);
1326
1327         isert_conn->post_recv_buf_count--;
1328         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1329                  isert_conn->post_recv_buf_count);
1330
1331         if ((char *)desc == isert_conn->login_req_buf)
1332                 return;
1333
1334         outstanding = isert_conn->post_recv_buf_count;
1335         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1336                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1337                                 ISERT_MIN_POSTED_RX);
1338                 err = isert_post_recv(isert_conn, count);
1339                 if (err) {
1340                         pr_err("isert_post_recv() count: %d failed, %d\n",
1341                                count, err);
1342                 }
1343         }
1344 }
1345
1346 static void
1347 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1348 {
1349         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1350         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1351
1352         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1353         if (wr->sge) {
1354                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1355                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1356                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1357                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1358                 wr->sge = NULL;
1359         }
1360
1361         if (wr->send_wr) {
1362                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1363                 kfree(wr->send_wr);
1364                 wr->send_wr = NULL;
1365         }
1366
1367         if (wr->ib_sge) {
1368                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1369                 kfree(wr->ib_sge);
1370                 wr->ib_sge = NULL;
1371         }
1372 }
1373
1374 static void
1375 isert_unreg_rdma_frwr(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1376 {
1377         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1378         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1379         LIST_HEAD(unmap_list);
1380
1381         pr_debug("unreg_frwr_cmd: %p\n", isert_cmd);
1382
1383         if (wr->fr_desc) {
1384                 pr_debug("unreg_frwr_cmd: %p free fr_desc %p\n",
1385                          isert_cmd, wr->fr_desc);
1386                 spin_lock_bh(&isert_conn->conn_lock);
1387                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_frwr_pool);
1388                 spin_unlock_bh(&isert_conn->conn_lock);
1389                 wr->fr_desc = NULL;
1390         }
1391
1392         if (wr->sge) {
1393                 pr_debug("unreg_frwr_cmd: %p unmap_sg op\n", isert_cmd);
1394                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1395                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1396                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1397                 wr->sge = NULL;
1398         }
1399
1400         wr->ib_sge = NULL;
1401         wr->send_wr = NULL;
1402 }
1403
1404 static void
1405 isert_put_cmd(struct isert_cmd *isert_cmd)
1406 {
1407         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1408         struct isert_conn *isert_conn = isert_cmd->conn;
1409         struct iscsi_conn *conn = isert_conn->conn;
1410         struct isert_device *device = isert_conn->conn_device;
1411
1412         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1413
1414         switch (cmd->iscsi_opcode) {
1415         case ISCSI_OP_SCSI_CMD:
1416                 spin_lock_bh(&conn->cmd_lock);
1417                 if (!list_empty(&cmd->i_conn_node))
1418                         list_del(&cmd->i_conn_node);
1419                 spin_unlock_bh(&conn->cmd_lock);
1420
1421                 if (cmd->data_direction == DMA_TO_DEVICE)
1422                         iscsit_stop_dataout_timer(cmd);
1423
1424                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1425                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1426                 break;
1427         case ISCSI_OP_SCSI_TMFUNC:
1428                 spin_lock_bh(&conn->cmd_lock);
1429                 if (!list_empty(&cmd->i_conn_node))
1430                         list_del(&cmd->i_conn_node);
1431                 spin_unlock_bh(&conn->cmd_lock);
1432
1433                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1434                 break;
1435         case ISCSI_OP_REJECT:
1436         case ISCSI_OP_NOOP_OUT:
1437         case ISCSI_OP_TEXT:
1438                 spin_lock_bh(&conn->cmd_lock);
1439                 if (!list_empty(&cmd->i_conn_node))
1440                         list_del(&cmd->i_conn_node);
1441                 spin_unlock_bh(&conn->cmd_lock);
1442
1443                 /*
1444                  * Handle special case for REJECT when iscsi_add_reject*() has
1445                  * overwritten the original iscsi_opcode assignment, and the
1446                  * associated cmd->se_cmd needs to be released.
1447                  */
1448                 if (cmd->se_cmd.se_tfo != NULL) {
1449                         pr_debug("Calling transport_generic_free_cmd from"
1450                                  " isert_put_cmd for 0x%02x\n",
1451                                  cmd->iscsi_opcode);
1452                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1453                         break;
1454                 }
1455                 /*
1456                  * Fall-through
1457                  */
1458         default:
1459                 iscsit_release_cmd(cmd);
1460                 break;
1461         }
1462 }
1463
1464 static void
1465 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1466 {
1467         if (tx_desc->dma_addr != 0) {
1468                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1469                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1470                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1471                 tx_desc->dma_addr = 0;
1472         }
1473 }
1474
1475 static void
1476 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1477                      struct ib_device *ib_dev)
1478 {
1479         if (isert_cmd->pdu_buf_dma != 0) {
1480                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1481                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1482                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1483                 isert_cmd->pdu_buf_dma = 0;
1484         }
1485
1486         isert_unmap_tx_desc(tx_desc, ib_dev);
1487         isert_put_cmd(isert_cmd);
1488 }
1489
1490 static void
1491 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1492                            struct isert_cmd *isert_cmd)
1493 {
1494         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1495         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1496         struct se_cmd *se_cmd = &cmd->se_cmd;
1497         struct isert_conn *isert_conn = isert_cmd->conn;
1498         struct isert_device *device = isert_conn->conn_device;
1499
1500         iscsit_stop_dataout_timer(cmd);
1501         device->unreg_rdma_mem(isert_cmd, isert_conn);
1502         cmd->write_data_done = wr->cur_rdma_length;
1503
1504         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1505         spin_lock_bh(&cmd->istate_lock);
1506         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1507         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1508         spin_unlock_bh(&cmd->istate_lock);
1509
1510         target_execute_cmd(se_cmd);
1511 }
1512
1513 static void
1514 isert_do_control_comp(struct work_struct *work)
1515 {
1516         struct isert_cmd *isert_cmd = container_of(work,
1517                         struct isert_cmd, comp_work);
1518         struct isert_conn *isert_conn = isert_cmd->conn;
1519         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1520         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1521
1522         switch (cmd->i_state) {
1523         case ISTATE_SEND_TASKMGTRSP:
1524                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1525
1526                 atomic_dec(&isert_conn->post_send_buf_count);
1527                 iscsit_tmr_post_handler(cmd, cmd->conn);
1528
1529                 cmd->i_state = ISTATE_SENT_STATUS;
1530                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1531                 break;
1532         case ISTATE_SEND_REJECT:
1533                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1534                 atomic_dec(&isert_conn->post_send_buf_count);
1535
1536                 cmd->i_state = ISTATE_SENT_STATUS;
1537                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1538                 break;
1539         case ISTATE_SEND_LOGOUTRSP:
1540                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1541                 /*
1542                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1543                  * from isert_free_conn()
1544                  */
1545                 isert_conn->logout_posted = true;
1546                 iscsit_logout_post_handler(cmd, cmd->conn);
1547                 break;
1548         case ISTATE_SEND_TEXTRSP:
1549                 atomic_dec(&isert_conn->post_send_buf_count);
1550                 cmd->i_state = ISTATE_SENT_STATUS;
1551                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1552                 break;
1553         default:
1554                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1555                 dump_stack();
1556                 break;
1557         }
1558 }
1559
1560 static void
1561 isert_response_completion(struct iser_tx_desc *tx_desc,
1562                           struct isert_cmd *isert_cmd,
1563                           struct isert_conn *isert_conn,
1564                           struct ib_device *ib_dev)
1565 {
1566         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1567
1568         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1569             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1570             cmd->i_state == ISTATE_SEND_REJECT ||
1571             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1572                 isert_unmap_tx_desc(tx_desc, ib_dev);
1573
1574                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1575                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1576                 return;
1577         }
1578         atomic_dec(&isert_conn->post_send_buf_count);
1579
1580         cmd->i_state = ISTATE_SENT_STATUS;
1581         isert_completion_put(tx_desc, isert_cmd, ib_dev);
1582 }
1583
1584 static void
1585 isert_send_completion(struct iser_tx_desc *tx_desc,
1586                       struct isert_conn *isert_conn)
1587 {
1588         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1589         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1590         struct isert_rdma_wr *wr;
1591
1592         if (!isert_cmd) {
1593                 atomic_dec(&isert_conn->post_send_buf_count);
1594                 isert_unmap_tx_desc(tx_desc, ib_dev);
1595                 return;
1596         }
1597         wr = &isert_cmd->rdma_wr;
1598
1599         switch (wr->iser_ib_op) {
1600         case ISER_IB_RECV:
1601                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1602                 dump_stack();
1603                 break;
1604         case ISER_IB_SEND:
1605                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1606                 isert_response_completion(tx_desc, isert_cmd,
1607                                           isert_conn, ib_dev);
1608                 break;
1609         case ISER_IB_RDMA_WRITE:
1610                 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1611                 dump_stack();
1612                 break;
1613         case ISER_IB_RDMA_READ:
1614                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1615
1616                 atomic_dec(&isert_conn->post_send_buf_count);
1617                 isert_completion_rdma_read(tx_desc, isert_cmd);
1618                 break;
1619         default:
1620                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1621                 dump_stack();
1622                 break;
1623         }
1624 }
1625
1626 static void
1627 isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1628 {
1629         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1630
1631         if (tx_desc) {
1632                 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1633
1634                 if (!isert_cmd)
1635                         isert_unmap_tx_desc(tx_desc, ib_dev);
1636                 else
1637                         isert_completion_put(tx_desc, isert_cmd, ib_dev);
1638         }
1639
1640         if (isert_conn->post_recv_buf_count == 0 &&
1641             atomic_read(&isert_conn->post_send_buf_count) == 0) {
1642                 pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1643                 pr_debug("Calling wake_up from isert_cq_comp_err\n");
1644
1645                 mutex_lock(&isert_conn->conn_mutex);
1646                 if (isert_conn->state != ISER_CONN_DOWN)
1647                         isert_conn->state = ISER_CONN_TERMINATING;
1648                 mutex_unlock(&isert_conn->conn_mutex);
1649
1650                 wake_up(&isert_conn->conn_wait_comp_err);
1651         }
1652 }
1653
1654 static void
1655 isert_cq_tx_work(struct work_struct *work)
1656 {
1657         struct isert_cq_desc *cq_desc = container_of(work,
1658                                 struct isert_cq_desc, cq_tx_work);
1659         struct isert_device *device = cq_desc->device;
1660         int cq_index = cq_desc->cq_index;
1661         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1662         struct isert_conn *isert_conn;
1663         struct iser_tx_desc *tx_desc;
1664         struct ib_wc wc;
1665
1666         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1667                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1668                 isert_conn = wc.qp->qp_context;
1669
1670                 if (wc.status == IB_WC_SUCCESS) {
1671                         isert_send_completion(tx_desc, isert_conn);
1672                 } else {
1673                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1674                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
1675                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1676                         atomic_dec(&isert_conn->post_send_buf_count);
1677                         isert_cq_comp_err(tx_desc, isert_conn);
1678                 }
1679         }
1680
1681         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1682 }
1683
1684 static void
1685 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1686 {
1687         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1688
1689         INIT_WORK(&cq_desc->cq_tx_work, isert_cq_tx_work);
1690         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1691 }
1692
1693 static void
1694 isert_cq_rx_work(struct work_struct *work)
1695 {
1696         struct isert_cq_desc *cq_desc = container_of(work,
1697                         struct isert_cq_desc, cq_rx_work);
1698         struct isert_device *device = cq_desc->device;
1699         int cq_index = cq_desc->cq_index;
1700         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1701         struct isert_conn *isert_conn;
1702         struct iser_rx_desc *rx_desc;
1703         struct ib_wc wc;
1704         unsigned long xfer_len;
1705
1706         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1707                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1708                 isert_conn = wc.qp->qp_context;
1709
1710                 if (wc.status == IB_WC_SUCCESS) {
1711                         xfer_len = (unsigned long)wc.byte_len;
1712                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
1713                 } else {
1714                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1715                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
1716                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1717                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
1718                                          wc.vendor_err);
1719                         }
1720                         isert_conn->post_recv_buf_count--;
1721                         isert_cq_comp_err(NULL, isert_conn);
1722                 }
1723         }
1724
1725         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1726 }
1727
1728 static void
1729 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1730 {
1731         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1732
1733         INIT_WORK(&cq_desc->cq_rx_work, isert_cq_rx_work);
1734         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1735 }
1736
1737 static int
1738 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1739 {
1740         struct ib_send_wr *wr_failed;
1741         int ret;
1742
1743         atomic_inc(&isert_conn->post_send_buf_count);
1744
1745         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1746                            &wr_failed);
1747         if (ret) {
1748                 pr_err("ib_post_send failed with %d\n", ret);
1749                 atomic_dec(&isert_conn->post_send_buf_count);
1750                 return ret;
1751         }
1752         return ret;
1753 }
1754
1755 static int
1756 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1757 {
1758         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1759         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1760         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1761         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1762                                 &isert_cmd->tx_desc.iscsi_header;
1763
1764         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1765         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1766         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1767         /*
1768          * Attach SENSE DATA payload to iSCSI Response PDU
1769          */
1770         if (cmd->se_cmd.sense_buffer &&
1771             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1772             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1773                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1774                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1775                 u32 padding, pdu_len;
1776
1777                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1778                                    cmd->sense_buffer);
1779                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1780
1781                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1782                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1783                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1784
1785                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1786                                 (void *)cmd->sense_buffer, pdu_len,
1787                                 DMA_TO_DEVICE);
1788
1789                 isert_cmd->pdu_buf_len = pdu_len;
1790                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1791                 tx_dsg->length  = pdu_len;
1792                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1793                 isert_cmd->tx_desc.num_sge = 2;
1794         }
1795
1796         isert_init_send_wr(isert_cmd, send_wr);
1797
1798         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1799
1800         return isert_post_response(isert_conn, isert_cmd);
1801 }
1802
1803 static int
1804 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1805                 bool nopout_response)
1806 {
1807         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1808         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1809         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1810
1811         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1812         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1813                                &isert_cmd->tx_desc.iscsi_header,
1814                                nopout_response);
1815         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1816         isert_init_send_wr(isert_cmd, send_wr);
1817
1818         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1819
1820         return isert_post_response(isert_conn, isert_cmd);
1821 }
1822
1823 static int
1824 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1825 {
1826         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1827         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1828         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1829
1830         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1831         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1832                                 &isert_cmd->tx_desc.iscsi_header);
1833         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1834         isert_init_send_wr(isert_cmd, send_wr);
1835
1836         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1837
1838         return isert_post_response(isert_conn, isert_cmd);
1839 }
1840
1841 static int
1842 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1843 {
1844         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1845         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1846         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1847
1848         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1849         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1850                                   &isert_cmd->tx_desc.iscsi_header);
1851         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1852         isert_init_send_wr(isert_cmd, send_wr);
1853
1854         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1855
1856         return isert_post_response(isert_conn, isert_cmd);
1857 }
1858
1859 static int
1860 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1861 {
1862         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1863         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1864         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1865         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1866         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1867         struct iscsi_reject *hdr =
1868                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1869
1870         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1871         iscsit_build_reject(cmd, conn, hdr);
1872         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1873
1874         hton24(hdr->dlength, ISCSI_HDR_LEN);
1875         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1876                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1877                         DMA_TO_DEVICE);
1878         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1879         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1880         tx_dsg->length  = ISCSI_HDR_LEN;
1881         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1882         isert_cmd->tx_desc.num_sge = 2;
1883
1884         isert_init_send_wr(isert_cmd, send_wr);
1885
1886         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1887
1888         return isert_post_response(isert_conn, isert_cmd);
1889 }
1890
1891 static int
1892 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1893 {
1894         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1896         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1897         struct iscsi_text_rsp *hdr =
1898                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1899         u32 txt_rsp_len;
1900         int rc;
1901
1902         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1903         rc = iscsit_build_text_rsp(cmd, conn, hdr);
1904         if (rc < 0)
1905                 return rc;
1906
1907         txt_rsp_len = rc;
1908         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1909
1910         if (txt_rsp_len) {
1911                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1912                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1913                 void *txt_rsp_buf = cmd->buf_ptr;
1914
1915                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1916                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1917
1918                 isert_cmd->pdu_buf_len = txt_rsp_len;
1919                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1920                 tx_dsg->length  = txt_rsp_len;
1921                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1922                 isert_cmd->tx_desc.num_sge = 2;
1923         }
1924         isert_init_send_wr(isert_cmd, send_wr);
1925
1926         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1927
1928         return isert_post_response(isert_conn, isert_cmd);
1929 }
1930
1931 static int
1932 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1933                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
1934                     u32 data_left, u32 offset)
1935 {
1936         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1937         struct scatterlist *sg_start, *tmp_sg;
1938         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1939         u32 sg_off, page_off;
1940         int i = 0, sg_nents;
1941
1942         sg_off = offset / PAGE_SIZE;
1943         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1944         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
1945         page_off = offset % PAGE_SIZE;
1946
1947         send_wr->sg_list = ib_sge;
1948         send_wr->num_sge = sg_nents;
1949         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
1950         /*
1951          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
1952          */
1953         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
1954                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
1955                          (unsigned long long)tmp_sg->dma_address,
1956                          tmp_sg->length, page_off);
1957
1958                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
1959                 ib_sge->length = min_t(u32, data_left,
1960                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
1961                 ib_sge->lkey = isert_conn->conn_mr->lkey;
1962
1963                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
1964                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
1965                 page_off = 0;
1966                 data_left -= ib_sge->length;
1967                 ib_sge++;
1968                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
1969         }
1970
1971         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
1972                  send_wr->sg_list, send_wr->num_sge);
1973
1974         return sg_nents;
1975 }
1976
1977 static int
1978 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1979                struct isert_rdma_wr *wr)
1980 {
1981         struct se_cmd *se_cmd = &cmd->se_cmd;
1982         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1983         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1984         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1985         struct ib_send_wr *send_wr;
1986         struct ib_sge *ib_sge;
1987         struct scatterlist *sg_start;
1988         u32 sg_off = 0, sg_nents;
1989         u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
1990         int ret = 0, count, i, ib_sge_cnt;
1991
1992         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
1993                 data_left = se_cmd->data_length;
1994                 iscsit_increment_maxcmdsn(cmd, conn->sess);
1995                 cmd->stat_sn = conn->stat_sn++;
1996         } else {
1997                 sg_off = cmd->write_data_done / PAGE_SIZE;
1998                 data_left = se_cmd->data_length - cmd->write_data_done;
1999                 offset = cmd->write_data_done;
2000                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2001         }
2002
2003         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2004         sg_nents = se_cmd->t_data_nents - sg_off;
2005
2006         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2007                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2008                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2009         if (unlikely(!count)) {
2010                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2011                 return -EINVAL;
2012         }
2013         wr->sge = sg_start;
2014         wr->num_sge = sg_nents;
2015         wr->cur_rdma_length = data_left;
2016         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2017                  isert_cmd, count, sg_start, sg_nents, data_left);
2018
2019         ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2020         if (!ib_sge) {
2021                 pr_warn("Unable to allocate ib_sge\n");
2022                 ret = -ENOMEM;
2023                 goto unmap_sg;
2024         }
2025         wr->ib_sge = ib_sge;
2026
2027         wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2028         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2029                                 GFP_KERNEL);
2030         if (!wr->send_wr) {
2031                 pr_debug("Unable to allocate wr->send_wr\n");
2032                 ret = -ENOMEM;
2033                 goto unmap_sg;
2034         }
2035
2036         wr->isert_cmd = isert_cmd;
2037         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2038
2039         for (i = 0; i < wr->send_wr_num; i++) {
2040                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2041                 data_len = min(data_left, rdma_write_max);
2042
2043                 send_wr->send_flags = 0;
2044                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2045                         send_wr->opcode = IB_WR_RDMA_WRITE;
2046                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2047                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2048                         if (i + 1 == wr->send_wr_num)
2049                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2050                         else
2051                                 send_wr->next = &wr->send_wr[i + 1];
2052                 } else {
2053                         send_wr->opcode = IB_WR_RDMA_READ;
2054                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2055                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2056                         if (i + 1 == wr->send_wr_num)
2057                                 send_wr->send_flags = IB_SEND_SIGNALED;
2058                         else
2059                                 send_wr->next = &wr->send_wr[i + 1];
2060                 }
2061
2062                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2063                                         send_wr, data_len, offset);
2064                 ib_sge += ib_sge_cnt;
2065
2066                 offset += data_len;
2067                 va_offset += data_len;
2068                 data_left -= data_len;
2069         }
2070
2071         return 0;
2072 unmap_sg:
2073         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2074                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2075                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2076         return ret;
2077 }
2078
2079 static int
2080 isert_map_fr_pagelist(struct ib_device *ib_dev,
2081                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2082 {
2083         u64 start_addr, end_addr, page, chunk_start = 0;
2084         struct scatterlist *tmp_sg;
2085         int i = 0, new_chunk, last_ent, n_pages;
2086
2087         n_pages = 0;
2088         new_chunk = 1;
2089         last_ent = sg_nents - 1;
2090         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2091                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2092                 if (new_chunk)
2093                         chunk_start = start_addr;
2094                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2095
2096                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2097                          i, (unsigned long long)tmp_sg->dma_address,
2098                          tmp_sg->length);
2099
2100                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2101                         new_chunk = 0;
2102                         continue;
2103                 }
2104                 new_chunk = 1;
2105
2106                 page = chunk_start & PAGE_MASK;
2107                 do {
2108                         fr_pl[n_pages++] = page;
2109                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2110                                  n_pages - 1, page);
2111                         page += PAGE_SIZE;
2112                 } while (page < end_addr);
2113         }
2114
2115         return n_pages;
2116 }
2117
2118 static int
2119 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
2120                   struct isert_cmd *isert_cmd, struct isert_conn *isert_conn,
2121                   struct ib_sge *ib_sge, u32 offset, unsigned int data_len)
2122 {
2123         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2124         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2125         struct scatterlist *sg_start;
2126         u32 sg_off, page_off;
2127         struct ib_send_wr fr_wr, inv_wr;
2128         struct ib_send_wr *bad_wr, *wr = NULL;
2129         u8 key;
2130         int ret, sg_nents, pagelist_len;
2131
2132         sg_off = offset / PAGE_SIZE;
2133         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2134         sg_nents = min_t(unsigned int, cmd->se_cmd.t_data_nents - sg_off,
2135                          ISCSI_ISER_SG_TABLESIZE);
2136         page_off = offset % PAGE_SIZE;
2137
2138         pr_debug("Cmd: %p use fr_desc %p sg_nents %d sg_off %d offset %u\n",
2139                  isert_cmd, fr_desc, sg_nents, sg_off, offset);
2140
2141         pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2142                                              &fr_desc->data_frpl->page_list[0]);
2143
2144         if (!fr_desc->valid) {
2145                 memset(&inv_wr, 0, sizeof(inv_wr));
2146                 inv_wr.opcode = IB_WR_LOCAL_INV;
2147                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2148                 wr = &inv_wr;
2149                 /* Bump the key */
2150                 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2151                 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2152         }
2153
2154         /* Prepare FASTREG WR */
2155         memset(&fr_wr, 0, sizeof(fr_wr));
2156         fr_wr.opcode = IB_WR_FAST_REG_MR;
2157         fr_wr.wr.fast_reg.iova_start =
2158                 fr_desc->data_frpl->page_list[0] + page_off;
2159         fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2160         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2161         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2162         fr_wr.wr.fast_reg.length = data_len;
2163         fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2164         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2165
2166         if (!wr)
2167                 wr = &fr_wr;
2168         else
2169                 wr->next = &fr_wr;
2170
2171         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2172         if (ret) {
2173                 pr_err("fast registration failed, ret:%d\n", ret);
2174                 return ret;
2175         }
2176         fr_desc->valid = false;
2177
2178         ib_sge->lkey = fr_desc->data_mr->lkey;
2179         ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2180         ib_sge->length = data_len;
2181
2182         pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2183                  ib_sge->addr, ib_sge->length, ib_sge->lkey);
2184
2185         return ret;
2186 }
2187
2188 static int
2189 isert_reg_rdma_frwr(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2190                     struct isert_rdma_wr *wr)
2191 {
2192         struct se_cmd *se_cmd = &cmd->se_cmd;
2193         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2194         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2195         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2196         struct ib_send_wr *send_wr;
2197         struct ib_sge *ib_sge;
2198         struct scatterlist *sg_start;
2199         struct fast_reg_descriptor *fr_desc;
2200         u32 sg_off = 0, sg_nents;
2201         u32 offset = 0, data_len, data_left, rdma_write_max;
2202         int ret = 0, count;
2203         unsigned long flags;
2204
2205         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2206                 data_left = se_cmd->data_length;
2207                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2208                 cmd->stat_sn = conn->stat_sn++;
2209         } else {
2210                 sg_off = cmd->write_data_done / PAGE_SIZE;
2211                 data_left = se_cmd->data_length - cmd->write_data_done;
2212                 offset = cmd->write_data_done;
2213                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2214         }
2215
2216         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2217         sg_nents = se_cmd->t_data_nents - sg_off;
2218
2219         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2220                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2221                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2222         if (unlikely(!count)) {
2223                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2224                 return -EINVAL;
2225         }
2226         wr->sge = sg_start;
2227         wr->num_sge = sg_nents;
2228         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2229                  isert_cmd, count, sg_start, sg_nents, data_left);
2230
2231         memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2232         ib_sge = &wr->s_ib_sge;
2233         wr->ib_sge = ib_sge;
2234
2235         wr->send_wr_num = 1;
2236         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2237         wr->send_wr = &wr->s_send_wr;
2238
2239         wr->isert_cmd = isert_cmd;
2240         rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2241
2242         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2243         send_wr->sg_list = ib_sge;
2244         send_wr->num_sge = 1;
2245         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2246         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2247                 send_wr->opcode = IB_WR_RDMA_WRITE;
2248                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2249                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2250                 send_wr->send_flags = 0;
2251                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2252         } else {
2253                 send_wr->opcode = IB_WR_RDMA_READ;
2254                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2255                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2256                 send_wr->send_flags = IB_SEND_SIGNALED;
2257         }
2258
2259         data_len = min(data_left, rdma_write_max);
2260         wr->cur_rdma_length = data_len;
2261
2262         spin_lock_irqsave(&isert_conn->conn_lock, flags);
2263         fr_desc = list_first_entry(&isert_conn->conn_frwr_pool,
2264                                    struct fast_reg_descriptor, list);
2265         list_del(&fr_desc->list);
2266         spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2267         wr->fr_desc = fr_desc;
2268
2269         ret = isert_fast_reg_mr(fr_desc, isert_cmd, isert_conn,
2270                           ib_sge, offset, data_len);
2271         if (ret) {
2272                 list_add_tail(&fr_desc->list, &isert_conn->conn_frwr_pool);
2273                 goto unmap_sg;
2274         }
2275
2276         return 0;
2277
2278 unmap_sg:
2279         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2280                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2281                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2282         return ret;
2283 }
2284
2285 static int
2286 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2287 {
2288         struct se_cmd *se_cmd = &cmd->se_cmd;
2289         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2290         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2291         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2292         struct isert_device *device = isert_conn->conn_device;
2293         struct ib_send_wr *wr_failed;
2294         int rc;
2295
2296         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2297                  isert_cmd, se_cmd->data_length);
2298         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2299         rc = device->reg_rdma_mem(conn, cmd, wr);
2300         if (rc) {
2301                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2302                 return rc;
2303         }
2304
2305         /*
2306          * Build isert_conn->tx_desc for iSCSI response PDU and attach
2307          */
2308         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2309         iscsit_build_rsp_pdu(cmd, conn, false, (struct iscsi_scsi_rsp *)
2310                              &isert_cmd->tx_desc.iscsi_header);
2311         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2312         isert_init_send_wr(isert_cmd, &isert_cmd->tx_desc.send_wr);
2313
2314         atomic_inc(&isert_conn->post_send_buf_count);
2315
2316         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2317         if (rc) {
2318                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2319                 atomic_dec(&isert_conn->post_send_buf_count);
2320         }
2321         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2322                  isert_cmd);
2323
2324         return 1;
2325 }
2326
2327 static int
2328 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2329 {
2330         struct se_cmd *se_cmd = &cmd->se_cmd;
2331         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2332         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2333         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2334         struct isert_device *device = isert_conn->conn_device;
2335         struct ib_send_wr *wr_failed;
2336         int rc;
2337
2338         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2339                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2340         wr->iser_ib_op = ISER_IB_RDMA_READ;
2341         rc = device->reg_rdma_mem(conn, cmd, wr);
2342         if (rc) {
2343                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2344                 return rc;
2345         }
2346
2347         atomic_inc(&isert_conn->post_send_buf_count);
2348
2349         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2350         if (rc) {
2351                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2352                 atomic_dec(&isert_conn->post_send_buf_count);
2353         }
2354         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2355                  isert_cmd);
2356
2357         return 0;
2358 }
2359
2360 static int
2361 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2362 {
2363         int ret;
2364
2365         switch (state) {
2366         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2367                 ret = isert_put_nopin(cmd, conn, false);
2368                 break;
2369         default:
2370                 pr_err("Unknown immediate state: 0x%02x\n", state);
2371                 ret = -EINVAL;
2372                 break;
2373         }
2374
2375         return ret;
2376 }
2377
2378 static int
2379 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2380 {
2381         int ret;
2382
2383         switch (state) {
2384         case ISTATE_SEND_LOGOUTRSP:
2385                 ret = isert_put_logout_rsp(cmd, conn);
2386                 if (!ret) {
2387                         pr_debug("Returning iSER Logout -EAGAIN\n");
2388                         ret = -EAGAIN;
2389                 }
2390                 break;
2391         case ISTATE_SEND_NOPIN:
2392                 ret = isert_put_nopin(cmd, conn, true);
2393                 break;
2394         case ISTATE_SEND_TASKMGTRSP:
2395                 ret = isert_put_tm_rsp(cmd, conn);
2396                 break;
2397         case ISTATE_SEND_REJECT:
2398                 ret = isert_put_reject(cmd, conn);
2399                 break;
2400         case ISTATE_SEND_TEXTRSP:
2401                 ret = isert_put_text_rsp(cmd, conn);
2402                 break;
2403         case ISTATE_SEND_STATUS:
2404                 /*
2405                  * Special case for sending non GOOD SCSI status from TX thread
2406                  * context during pre se_cmd excecution failure.
2407                  */
2408                 ret = isert_put_response(conn, cmd);
2409                 break;
2410         default:
2411                 pr_err("Unknown response state: 0x%02x\n", state);
2412                 ret = -EINVAL;
2413                 break;
2414         }
2415
2416         return ret;
2417 }
2418
2419 static int
2420 isert_setup_np(struct iscsi_np *np,
2421                struct __kernel_sockaddr_storage *ksockaddr)
2422 {
2423         struct isert_np *isert_np;
2424         struct rdma_cm_id *isert_lid;
2425         struct sockaddr *sa;
2426         int ret;
2427
2428         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2429         if (!isert_np) {
2430                 pr_err("Unable to allocate struct isert_np\n");
2431                 return -ENOMEM;
2432         }
2433         init_waitqueue_head(&isert_np->np_accept_wq);
2434         mutex_init(&isert_np->np_accept_mutex);
2435         INIT_LIST_HEAD(&isert_np->np_accept_list);
2436         init_completion(&isert_np->np_login_comp);
2437
2438         sa = (struct sockaddr *)ksockaddr;
2439         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2440         /*
2441          * Setup the np->np_sockaddr from the passed sockaddr setup
2442          * in iscsi_target_configfs.c code..
2443          */
2444         memcpy(&np->np_sockaddr, ksockaddr,
2445                sizeof(struct __kernel_sockaddr_storage));
2446
2447         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2448                                 IB_QPT_RC);
2449         if (IS_ERR(isert_lid)) {
2450                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2451                        PTR_ERR(isert_lid));
2452                 ret = PTR_ERR(isert_lid);
2453                 goto out;
2454         }
2455
2456         ret = rdma_bind_addr(isert_lid, sa);
2457         if (ret) {
2458                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2459                 goto out_lid;
2460         }
2461
2462         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2463         if (ret) {
2464                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2465                 goto out_lid;
2466         }
2467
2468         isert_np->np_cm_id = isert_lid;
2469         np->np_context = isert_np;
2470         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2471
2472         return 0;
2473
2474 out_lid:
2475         rdma_destroy_id(isert_lid);
2476 out:
2477         kfree(isert_np);
2478         return ret;
2479 }
2480
2481 static int
2482 isert_check_accept_queue(struct isert_np *isert_np)
2483 {
2484         int empty;
2485
2486         mutex_lock(&isert_np->np_accept_mutex);
2487         empty = list_empty(&isert_np->np_accept_list);
2488         mutex_unlock(&isert_np->np_accept_mutex);
2489
2490         return empty;
2491 }
2492
2493 static int
2494 isert_rdma_accept(struct isert_conn *isert_conn)
2495 {
2496         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2497         struct rdma_conn_param cp;
2498         int ret;
2499
2500         memset(&cp, 0, sizeof(struct rdma_conn_param));
2501         cp.responder_resources = isert_conn->responder_resources;
2502         cp.initiator_depth = isert_conn->initiator_depth;
2503         cp.retry_count = 7;
2504         cp.rnr_retry_count = 7;
2505
2506         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2507
2508         ret = rdma_accept(cm_id, &cp);
2509         if (ret) {
2510                 pr_err("rdma_accept() failed with: %d\n", ret);
2511                 return ret;
2512         }
2513
2514         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2515
2516         return 0;
2517 }
2518
2519 static int
2520 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2521 {
2522         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2523         int ret;
2524
2525         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2526         /*
2527          * For login requests after the first PDU, isert_rx_login_req() will
2528          * kick schedule_delayed_work(&conn->login_work) as the packet is
2529          * received, which turns this callback from iscsi_target_do_login_rx()
2530          * into a NOP.
2531          */
2532         if (!login->first_request)
2533                 return 0;
2534
2535         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2536         if (ret)
2537                 return ret;
2538
2539         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2540         return 0;
2541 }
2542
2543 static void
2544 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2545                     struct isert_conn *isert_conn)
2546 {
2547         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2548         struct rdma_route *cm_route = &cm_id->route;
2549         struct sockaddr_in *sock_in;
2550         struct sockaddr_in6 *sock_in6;
2551
2552         conn->login_family = np->np_sockaddr.ss_family;
2553
2554         if (np->np_sockaddr.ss_family == AF_INET6) {
2555                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2556                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2557                          &sock_in6->sin6_addr.in6_u);
2558                 conn->login_port = ntohs(sock_in6->sin6_port);
2559
2560                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2561                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2562                          &sock_in6->sin6_addr.in6_u);
2563                 conn->local_port = ntohs(sock_in6->sin6_port);
2564         } else {
2565                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2566                 sprintf(conn->login_ip, "%pI4",
2567                         &sock_in->sin_addr.s_addr);
2568                 conn->login_port = ntohs(sock_in->sin_port);
2569
2570                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2571                 sprintf(conn->local_ip, "%pI4",
2572                         &sock_in->sin_addr.s_addr);
2573                 conn->local_port = ntohs(sock_in->sin_port);
2574         }
2575 }
2576
2577 static int
2578 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2579 {
2580         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2581         struct isert_conn *isert_conn;
2582         int max_accept = 0, ret;
2583
2584 accept_wait:
2585         ret = wait_event_interruptible(isert_np->np_accept_wq,
2586                         !isert_check_accept_queue(isert_np) ||
2587                         np->np_thread_state == ISCSI_NP_THREAD_RESET);
2588         if (max_accept > 5)
2589                 return -ENODEV;
2590
2591         spin_lock_bh(&np->np_thread_lock);
2592         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2593                 spin_unlock_bh(&np->np_thread_lock);
2594                 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2595                 return -ENODEV;
2596         }
2597         spin_unlock_bh(&np->np_thread_lock);
2598
2599         mutex_lock(&isert_np->np_accept_mutex);
2600         if (list_empty(&isert_np->np_accept_list)) {
2601                 mutex_unlock(&isert_np->np_accept_mutex);
2602                 max_accept++;
2603                 goto accept_wait;
2604         }
2605         isert_conn = list_first_entry(&isert_np->np_accept_list,
2606                         struct isert_conn, conn_accept_node);
2607         list_del_init(&isert_conn->conn_accept_node);
2608         mutex_unlock(&isert_np->np_accept_mutex);
2609
2610         conn->context = isert_conn;
2611         isert_conn->conn = conn;
2612         max_accept = 0;
2613
2614         ret = isert_rdma_post_recvl(isert_conn);
2615         if (ret)
2616                 return ret;
2617
2618         ret = isert_rdma_accept(isert_conn);
2619         if (ret)
2620                 return ret;
2621
2622         isert_set_conn_info(np, conn, isert_conn);
2623
2624         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2625         return 0;
2626 }
2627
2628 static void
2629 isert_free_np(struct iscsi_np *np)
2630 {
2631         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2632
2633         rdma_destroy_id(isert_np->np_cm_id);
2634
2635         np->np_context = NULL;
2636         kfree(isert_np);
2637 }
2638
2639 static int isert_check_state(struct isert_conn *isert_conn, int state)
2640 {
2641         int ret;
2642
2643         mutex_lock(&isert_conn->conn_mutex);
2644         ret = (isert_conn->state == state);
2645         mutex_unlock(&isert_conn->conn_mutex);
2646
2647         return ret;
2648 }
2649
2650 static void isert_free_conn(struct iscsi_conn *conn)
2651 {
2652         struct isert_conn *isert_conn = conn->context;
2653
2654         pr_debug("isert_free_conn: Starting \n");
2655         /*
2656          * Decrement post_send_buf_count for special case when called
2657          * from isert_do_control_comp() -> iscsit_logout_post_handler()
2658          */
2659         mutex_lock(&isert_conn->conn_mutex);
2660         if (isert_conn->logout_posted)
2661                 atomic_dec(&isert_conn->post_send_buf_count);
2662
2663         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
2664                 pr_debug("Calling rdma_disconnect from isert_free_conn\n");
2665                 rdma_disconnect(isert_conn->conn_cm_id);
2666         }
2667         /*
2668          * Only wait for conn_wait_comp_err if the isert_conn made it
2669          * into full feature phase..
2670          */
2671         if (isert_conn->state == ISER_CONN_UP) {
2672                 pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
2673                          isert_conn->state);
2674                 mutex_unlock(&isert_conn->conn_mutex);
2675
2676                 wait_event(isert_conn->conn_wait_comp_err,
2677                           (isert_check_state(isert_conn, ISER_CONN_TERMINATING)));
2678
2679                 wait_event(isert_conn->conn_wait,
2680                           (isert_check_state(isert_conn, ISER_CONN_DOWN)));
2681
2682                 isert_put_conn(isert_conn);
2683                 return;
2684         }
2685         if (isert_conn->state == ISER_CONN_INIT) {
2686                 mutex_unlock(&isert_conn->conn_mutex);
2687                 isert_put_conn(isert_conn);
2688                 return;
2689         }
2690         pr_debug("isert_free_conn: wait_event conn_wait %d\n",
2691                  isert_conn->state);
2692         mutex_unlock(&isert_conn->conn_mutex);
2693
2694         wait_event(isert_conn->conn_wait,
2695                   (isert_check_state(isert_conn, ISER_CONN_DOWN)));
2696
2697         isert_put_conn(isert_conn);
2698 }
2699
2700 static struct iscsit_transport iser_target_transport = {
2701         .name                   = "IB/iSER",
2702         .transport_type         = ISCSI_INFINIBAND,
2703         .priv_size              = sizeof(struct isert_cmd),
2704         .owner                  = THIS_MODULE,
2705         .iscsit_setup_np        = isert_setup_np,
2706         .iscsit_accept_np       = isert_accept_np,
2707         .iscsit_free_np         = isert_free_np,
2708         .iscsit_free_conn       = isert_free_conn,
2709         .iscsit_get_login_rx    = isert_get_login_rx,
2710         .iscsit_put_login_tx    = isert_put_login_tx,
2711         .iscsit_immediate_queue = isert_immediate_queue,
2712         .iscsit_response_queue  = isert_response_queue,
2713         .iscsit_get_dataout     = isert_get_dataout,
2714         .iscsit_queue_data_in   = isert_put_datain,
2715         .iscsit_queue_status    = isert_put_response,
2716 };
2717
2718 static int __init isert_init(void)
2719 {
2720         int ret;
2721
2722         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2723         if (!isert_rx_wq) {
2724                 pr_err("Unable to allocate isert_rx_wq\n");
2725                 return -ENOMEM;
2726         }
2727
2728         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2729         if (!isert_comp_wq) {
2730                 pr_err("Unable to allocate isert_comp_wq\n");
2731                 ret = -ENOMEM;
2732                 goto destroy_rx_wq;
2733         }
2734
2735         iscsit_register_transport(&iser_target_transport);
2736         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2737         return 0;
2738
2739 destroy_rx_wq:
2740         destroy_workqueue(isert_rx_wq);
2741         return ret;
2742 }
2743
2744 static void __exit isert_exit(void)
2745 {
2746         destroy_workqueue(isert_comp_wq);
2747         destroy_workqueue(isert_rx_wq);
2748         iscsit_unregister_transport(&iser_target_transport);
2749         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2750 }
2751
2752 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2753 MODULE_VERSION("0.1");
2754 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2755 MODULE_LICENSE("GPL");
2756
2757 module_init(isert_init);
2758 module_exit(isert_exit);