drivers/infiniband/ulp/isert/ib_isert.c

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