drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31
  32 #include "isert_proto.h"
  33 #include "ib_isert.h"
  34
  35 #define ISERT_MAX_CONN          8
  36 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  37 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  38
  39 static DEFINE_MUTEX(device_list_mutex);
  40 static LIST_HEAD(device_list);
  41 static struct workqueue_struct *isert_rx_wq;
  42 static struct workqueue_struct *isert_comp_wq;
  43
  44 static void
  45 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  46 static int
  47 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  48                struct isert_rdma_wr *wr);
  49 static void
  50 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  51 static int
  52 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  53                struct isert_rdma_wr *wr);
  54
  55 static void
  56 isert_qp_event_callback(struct ib_event *e, void *context)
  57 {
  58         struct isert_conn *isert_conn = (struct isert_conn *)context;
  59
  60         pr_err("isert_qp_event_callback event: %d\n", e->event);
  61         switch (e->event) {
  62         case IB_EVENT_COMM_EST:
  63                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  64                 break;
  65         case IB_EVENT_QP_LAST_WQE_REACHED:
  66                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  67                 break;
  68         default:
  69                 break;
  70         }
  71 }
  72
  73 static int
  74 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  75 {
  76         int ret;
  77
  78         ret = ib_query_device(ib_dev, devattr);
  79         if (ret) {
  80                 pr_err("ib_query_device() failed: %d\n", ret);
  81                 return ret;
  82         }
  83         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  84         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  85
  86         return 0;
  87 }
  88
  89 static int
  90 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
  91 {
  92         struct isert_device *device = isert_conn->conn_device;
  93         struct ib_qp_init_attr attr;
  94         int ret, index, min_index = 0;
  95
  96         mutex_lock(&device_list_mutex);
  97         for (index = 0; index < device->cqs_used; index++)
  98                 if (device->cq_active_qps[index] <
  99                     device->cq_active_qps[min_index])
 100                         min_index = index;
 101         device->cq_active_qps[min_index]++;
 102         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 103         mutex_unlock(&device_list_mutex);
 104
 105         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 106         attr.event_handler = isert_qp_event_callback;
 107         attr.qp_context = isert_conn;
 108         attr.send_cq = device->dev_tx_cq[min_index];
 109         attr.recv_cq = device->dev_rx_cq[min_index];
 110         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 111         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 112         /*
 113          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 114          * work-around for RDMA_READ..
 115          */
 116         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 117         isert_conn->max_sge = attr.cap.max_send_sge;
 118
 119         attr.cap.max_recv_sge = 1;
 120         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 121         attr.qp_type = IB_QPT_RC;
 122
 123         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 124                  cma_id->device);
 125         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 126                  isert_conn->conn_pd->device);
 127
 128         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 129         if (ret) {
 130                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 131                 return ret;
 132         }
 133         isert_conn->conn_qp = cma_id->qp;
 134         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 135
 136         return 0;
 137 }
 138
 139 static void
 140 isert_cq_event_callback(struct ib_event *e, void *context)
 141 {
 142         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 143 }
 144
 145 static int
 146 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 147 {
 148         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 149         struct iser_rx_desc *rx_desc;
 150         struct ib_sge *rx_sg;
 151         u64 dma_addr;
 152         int i, j;
 153
 154         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 155                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 156         if (!isert_conn->conn_rx_descs)
 157                 goto fail;
 158
 159         rx_desc = isert_conn->conn_rx_descs;
 160
 161         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 162                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 163                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 164                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 165                         goto dma_map_fail;
 166
 167                 rx_desc->dma_addr = dma_addr;
 168
 169                 rx_sg = &rx_desc->rx_sg;
 170                 rx_sg->addr = rx_desc->dma_addr;
 171                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 172                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 173         }
 174
 175         isert_conn->conn_rx_desc_head = 0;
 176         return 0;
 177
 178 dma_map_fail:
 179         rx_desc = isert_conn->conn_rx_descs;
 180         for (j = 0; j < i; j++, rx_desc++) {
 181                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 182                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 183         }
 184         kfree(isert_conn->conn_rx_descs);
 185         isert_conn->conn_rx_descs = NULL;
 186 fail:
 187         return -ENOMEM;
 188 }
 189
 190 static void
 191 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 192 {
 193         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 194         struct iser_rx_desc *rx_desc;
 195         int i;
 196
 197         if (!isert_conn->conn_rx_descs)
 198                 return;
 199
 200         rx_desc = isert_conn->conn_rx_descs;
 201         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 202                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 203                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 204         }
 205
 206         kfree(isert_conn->conn_rx_descs);
 207         isert_conn->conn_rx_descs = NULL;
 208 }
 209
 210 static void isert_cq_tx_work(struct work_struct *);
 211 static void isert_cq_tx_callback(struct ib_cq *, void *);
 212 static void isert_cq_rx_work(struct work_struct *);
 213 static void isert_cq_rx_callback(struct ib_cq *, void *);
 214
 215 static int
 216 isert_create_device_ib_res(struct isert_device *device)
 217 {
 218         struct ib_device *ib_dev = device->ib_device;
 219         struct isert_cq_desc *cq_desc;
 220         struct ib_device_attr *dev_attr;
 221         int ret = 0, i, j;
 222
 223         dev_attr = &device->dev_attr;
 224         ret = isert_query_device(ib_dev, dev_attr);
 225         if (ret)
 226                 return ret;
 227
 228         /* asign function handlers */
 229         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
 230                 device->use_fastreg = 1;
 231                 device->reg_rdma_mem = isert_reg_rdma;
 232                 device->unreg_rdma_mem = isert_unreg_rdma;
 233         } else {
 234                 device->use_fastreg = 0;
 235                 device->reg_rdma_mem = isert_map_rdma;
 236                 device->unreg_rdma_mem = isert_unmap_cmd;
 237         }
 238
 239         device->cqs_used = min_t(int, num_online_cpus(),
 240                                  device->ib_device->num_comp_vectors);
 241         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 242         pr_debug("Using %d CQs, device %s supports %d vectors support "
 243                  "Fast registration %d\n",
 244                  device->cqs_used, device->ib_device->name,
 245                  device->ib_device->num_comp_vectors, device->use_fastreg);
 246         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 247                                 device->cqs_used, GFP_KERNEL);
 248         if (!device->cq_desc) {
 249                 pr_err("Unable to allocate device->cq_desc\n");
 250                 return -ENOMEM;
 251         }
 252         cq_desc = device->cq_desc;
 253
 254         for (i = 0; i < device->cqs_used; i++) {
 255                 cq_desc[i].device = device;
 256                 cq_desc[i].cq_index = i;
 257
 258                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 259                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 260                                                 isert_cq_rx_callback,
 261                                                 isert_cq_event_callback,
 262                                                 (void *)&cq_desc[i],
 263                                                 ISER_MAX_RX_CQ_LEN, i);
 264                 if (IS_ERR(device->dev_rx_cq[i])) {
 265                         ret = PTR_ERR(device->dev_rx_cq[i]);
 266                         device->dev_rx_cq[i] = NULL;
 267                         goto out_cq;
 268                 }
 269
 270                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 271                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 272                                                 isert_cq_tx_callback,
 273                                                 isert_cq_event_callback,
 274                                                 (void *)&cq_desc[i],
 275                                                 ISER_MAX_TX_CQ_LEN, i);
 276                 if (IS_ERR(device->dev_tx_cq[i])) {
 277                         ret = PTR_ERR(device->dev_tx_cq[i]);
 278                         device->dev_tx_cq[i] = NULL;
 279                         goto out_cq;
 280                 }
 281
 282                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 283                 if (ret)
 284                         goto out_cq;
 285
 286                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 287                 if (ret)
 288                         goto out_cq;
 289         }
 290
 291         return 0;
 292
 293 out_cq:
 294         for (j = 0; j < i; j++) {
 295                 cq_desc = &device->cq_desc[j];
 296
 297                 if (device->dev_rx_cq[j]) {
 298                         cancel_work_sync(&cq_desc->cq_rx_work);
 299                         ib_destroy_cq(device->dev_rx_cq[j]);
 300                 }
 301                 if (device->dev_tx_cq[j]) {
 302                         cancel_work_sync(&cq_desc->cq_tx_work);
 303                         ib_destroy_cq(device->dev_tx_cq[j]);
 304                 }
 305         }
 306         kfree(device->cq_desc);
 307
 308         return ret;
 309 }
 310
 311 static void
 312 isert_free_device_ib_res(struct isert_device *device)
 313 {
 314         struct isert_cq_desc *cq_desc;
 315         int i;
 316
 317         for (i = 0; i < device->cqs_used; i++) {
 318                 cq_desc = &device->cq_desc[i];
 319
 320                 cancel_work_sync(&cq_desc->cq_rx_work);
 321                 cancel_work_sync(&cq_desc->cq_tx_work);
 322                 ib_destroy_cq(device->dev_rx_cq[i]);
 323                 ib_destroy_cq(device->dev_tx_cq[i]);
 324                 device->dev_rx_cq[i] = NULL;
 325                 device->dev_tx_cq[i] = NULL;
 326         }
 327
 328         kfree(device->cq_desc);
 329 }
 330
 331 static void
 332 isert_device_try_release(struct isert_device *device)
 333 {
 334         mutex_lock(&device_list_mutex);
 335         device->refcount--;
 336         if (!device->refcount) {
 337                 isert_free_device_ib_res(device);
 338                 list_del(&device->dev_node);
 339                 kfree(device);
 340         }
 341         mutex_unlock(&device_list_mutex);
 342 }
 343
 344 static struct isert_device *
 345 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 346 {
 347         struct isert_device *device;
 348         int ret;
 349
 350         mutex_lock(&device_list_mutex);
 351         list_for_each_entry(device, &device_list, dev_node) {
 352                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 353                         device->refcount++;
 354                         mutex_unlock(&device_list_mutex);
 355                         return device;
 356                 }
 357         }
 358
 359         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 360         if (!device) {
 361                 mutex_unlock(&device_list_mutex);
 362                 return ERR_PTR(-ENOMEM);
 363         }
 364
 365         INIT_LIST_HEAD(&device->dev_node);
 366
 367         device->ib_device = cma_id->device;
 368         ret = isert_create_device_ib_res(device);
 369         if (ret) {
 370                 kfree(device);
 371                 mutex_unlock(&device_list_mutex);
 372                 return ERR_PTR(ret);
 373         }
 374
 375         device->refcount++;
 376         list_add_tail(&device->dev_node, &device_list);
 377         mutex_unlock(&device_list_mutex);
 378
 379         return device;
 380 }
 381
 382 static void
 383 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 384 {
 385         struct fast_reg_descriptor *fr_desc, *tmp;
 386         int i = 0;
 387
 388         if (list_empty(&isert_conn->conn_fr_pool))
 389                 return;
 390
 391         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 392
 393         list_for_each_entry_safe(fr_desc, tmp,
 394                                  &isert_conn->conn_fr_pool, list) {
 395                 list_del(&fr_desc->list);
 396                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 397                 ib_dereg_mr(fr_desc->data_mr);
 398                 kfree(fr_desc);
 399                 ++i;
 400         }
 401
 402         if (i < isert_conn->conn_fr_pool_size)
 403                 pr_warn("Pool still has %d regions registered\n",
 404                         isert_conn->conn_fr_pool_size - i);
 405 }
 406
 407 static int
 408 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 409                      struct fast_reg_descriptor *fr_desc)
 410 {
 411         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 412                                                          ISCSI_ISER_SG_TABLESIZE);
 413         if (IS_ERR(fr_desc->data_frpl)) {
 414                 pr_err("Failed to allocate data frpl err=%ld\n",
 415                        PTR_ERR(fr_desc->data_frpl));
 416                 return PTR_ERR(fr_desc->data_frpl);
 417         }
 418
 419         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 420         if (IS_ERR(fr_desc->data_mr)) {
 421                 pr_err("Failed to allocate data frmr err=%ld\n",
 422                        PTR_ERR(fr_desc->data_mr));
 423                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 424                 return PTR_ERR(fr_desc->data_mr);
 425         }
 426         pr_debug("Create fr_desc %p page_list %p\n",
 427                  fr_desc, fr_desc->data_frpl->page_list);
 428
 429         fr_desc->valid = true;
 430
 431         return 0;
 432 }
 433
 434 static int
 435 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 436 {
 437         struct fast_reg_descriptor *fr_desc;
 438         struct isert_device *device = isert_conn->conn_device;
 439         int i, ret;
 440
 441         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 442         isert_conn->conn_fr_pool_size = 0;
 443         for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
 444                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 445                 if (!fr_desc) {
 446                         pr_err("Failed to allocate fast_reg descriptor\n");
 447                         ret = -ENOMEM;
 448                         goto err;
 449                 }
 450
 451                 ret = isert_create_fr_desc(device->ib_device,
 452                                            isert_conn->conn_pd, fr_desc);
 453                 if (ret) {
 454                         pr_err("Failed to create fastreg descriptor err=%d\n",
 455                                ret);
 456                         kfree(fr_desc);
 457                         goto err;
 458                 }
 459
 460                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 461                 isert_conn->conn_fr_pool_size++;
 462         }
 463
 464         pr_debug("Creating conn %p fastreg pool size=%d",
 465                  isert_conn, isert_conn->conn_fr_pool_size);
 466
 467         return 0;
 468
 469 err:
 470         isert_conn_free_fastreg_pool(isert_conn);
 471         return ret;
 472 }
 473
 474 static int
 475 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 476 {
 477         struct iscsi_np *np = cma_id->context;
 478         struct isert_np *isert_np = np->np_context;
 479         struct isert_conn *isert_conn;
 480         struct isert_device *device;
 481         struct ib_device *ib_dev = cma_id->device;
 482         int ret = 0;
 483
 484         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 485                  cma_id, cma_id->context);
 486
 487         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 488         if (!isert_conn) {
 489                 pr_err("Unable to allocate isert_conn\n");
 490                 return -ENOMEM;
 491         }
 492         isert_conn->state = ISER_CONN_INIT;
 493         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 494         init_completion(&isert_conn->conn_login_comp);
 495         init_completion(&isert_conn->conn_wait);
 496         init_completion(&isert_conn->conn_wait_comp_err);
 497         kref_init(&isert_conn->conn_kref);
 498         kref_get(&isert_conn->conn_kref);
 499         mutex_init(&isert_conn->conn_mutex);
 500         spin_lock_init(&isert_conn->conn_lock);
 501
 502         cma_id->context = isert_conn;
 503         isert_conn->conn_cm_id = cma_id;
 504         isert_conn->responder_resources = event->param.conn.responder_resources;
 505         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 506         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 507                  isert_conn->responder_resources, isert_conn->initiator_depth);
 508
 509         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 510                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 511         if (!isert_conn->login_buf) {
 512                 pr_err("Unable to allocate isert_conn->login_buf\n");
 513                 ret = -ENOMEM;
 514                 goto out;
 515         }
 516
 517         isert_conn->login_req_buf = isert_conn->login_buf;
 518         isert_conn->login_rsp_buf = isert_conn->login_buf +
 519                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 520         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 521                  isert_conn->login_buf, isert_conn->login_req_buf,
 522                  isert_conn->login_rsp_buf);
 523
 524         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 525                                 (void *)isert_conn->login_req_buf,
 526                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 527
 528         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 529         if (ret) {
 530                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 531                        ret);
 532                 isert_conn->login_req_dma = 0;
 533                 goto out_login_buf;
 534         }
 535
 536         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 537                                         (void *)isert_conn->login_rsp_buf,
 538                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 539
 540         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 541         if (ret) {
 542                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 543                        ret);
 544                 isert_conn->login_rsp_dma = 0;
 545                 goto out_req_dma_map;
 546         }
 547
 548         device = isert_device_find_by_ib_dev(cma_id);
 549         if (IS_ERR(device)) {
 550                 ret = PTR_ERR(device);
 551                 goto out_rsp_dma_map;
 552         }
 553
 554         isert_conn->conn_device = device;
 555         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 556         if (IS_ERR(isert_conn->conn_pd)) {
 557                 ret = PTR_ERR(isert_conn->conn_pd);
 558                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 559                        isert_conn, ret);
 560                 goto out_pd;
 561         }
 562
 563         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 564                                            IB_ACCESS_LOCAL_WRITE);
 565         if (IS_ERR(isert_conn->conn_mr)) {
 566                 ret = PTR_ERR(isert_conn->conn_mr);
 567                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 568                        isert_conn, ret);
 569                 goto out_mr;
 570         }
 571
 572         if (device->use_fastreg) {
 573                 ret = isert_conn_create_fastreg_pool(isert_conn);
 574                 if (ret) {
 575                         pr_err("Conn: %p failed to create fastreg pool\n",
 576                                isert_conn);
 577                         goto out_fastreg;
 578                 }
 579         }
 580
 581         ret = isert_conn_setup_qp(isert_conn, cma_id);
 582         if (ret)
 583                 goto out_conn_dev;
 584
 585         mutex_lock(&isert_np->np_accept_mutex);
 586         list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
 587         mutex_unlock(&isert_np->np_accept_mutex);
 588
 589         pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
 590         wake_up(&isert_np->np_accept_wq);
 591         return 0;
 592
 593 out_conn_dev:
 594         if (device->use_fastreg)
 595                 isert_conn_free_fastreg_pool(isert_conn);
 596 out_fastreg:
 597         ib_dereg_mr(isert_conn->conn_mr);
 598 out_mr:
 599         ib_dealloc_pd(isert_conn->conn_pd);
 600 out_pd:
 601         isert_device_try_release(device);
 602 out_rsp_dma_map:
 603         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 604                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 605 out_req_dma_map:
 606         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 607                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 608 out_login_buf:
 609         kfree(isert_conn->login_buf);
 610 out:
 611         kfree(isert_conn);
 612         return ret;
 613 }
 614
 615 static void
 616 isert_connect_release(struct isert_conn *isert_conn)
 617 {
 618         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 619         struct isert_device *device = isert_conn->conn_device;
 620         int cq_index;
 621
 622         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 623
 624         if (device && device->use_fastreg)
 625                 isert_conn_free_fastreg_pool(isert_conn);
 626
 627         if (isert_conn->conn_qp) {
 628                 cq_index = ((struct isert_cq_desc *)
 629                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 630                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 631                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 632
 633                 rdma_destroy_qp(isert_conn->conn_cm_id);
 634         }
 635
 636         isert_free_rx_descriptors(isert_conn);
 637         rdma_destroy_id(isert_conn->conn_cm_id);
 638
 639         ib_dereg_mr(isert_conn->conn_mr);
 640         ib_dealloc_pd(isert_conn->conn_pd);
 641
 642         if (isert_conn->login_buf) {
 643                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 644                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 645                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 646                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 647                                     DMA_FROM_DEVICE);
 648                 kfree(isert_conn->login_buf);
 649         }
 650         kfree(isert_conn);
 651
 652         if (device)
 653                 isert_device_try_release(device);
 654
 655         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 656 }
 657
 658 static void
 659 isert_connected_handler(struct rdma_cm_id *cma_id)
 660 {
 661         return;
 662 }
 663
 664 static void
 665 isert_release_conn_kref(struct kref *kref)
 666 {
 667         struct isert_conn *isert_conn = container_of(kref,
 668                                 struct isert_conn, conn_kref);
 669
 670         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 671                  current->comm, current->pid);
 672
 673         isert_connect_release(isert_conn);
 674 }
 675
 676 static void
 677 isert_put_conn(struct isert_conn *isert_conn)
 678 {
 679         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 680 }
 681
 682 static void
 683 isert_disconnect_work(struct work_struct *work)
 684 {
 685         struct isert_conn *isert_conn = container_of(work,
 686                                 struct isert_conn, conn_logout_work);
 687
 688         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 689         mutex_lock(&isert_conn->conn_mutex);
 690         if (isert_conn->state == ISER_CONN_UP)
 691                 isert_conn->state = ISER_CONN_TERMINATING;
 692
 693         if (isert_conn->post_recv_buf_count == 0 &&
 694             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 695                 mutex_unlock(&isert_conn->conn_mutex);
 696                 goto wake_up;
 697         }
 698         if (!isert_conn->conn_cm_id) {
 699                 mutex_unlock(&isert_conn->conn_mutex);
 700                 isert_put_conn(isert_conn);
 701                 return;
 702         }
 703         if (!isert_conn->logout_posted) {
 704                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 705                          " isert_disconnect_work\n");
 706                 rdma_disconnect(isert_conn->conn_cm_id);
 707                 mutex_unlock(&isert_conn->conn_mutex);
 708                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 709                 goto wake_up;
 710         }
 711         mutex_unlock(&isert_conn->conn_mutex);
 712
 713 wake_up:
 714         complete(&isert_conn->conn_wait);
 715         isert_put_conn(isert_conn);
 716 }
 717
 718 static void
 719 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 720 {
 721         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 722
 723         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 724         schedule_work(&isert_conn->conn_logout_work);
 725 }
 726
 727 static int
 728 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 729 {
 730         int ret = 0;
 731
 732         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 733                  event->event, event->status, cma_id->context, cma_id);
 734
 735         switch (event->event) {
 736         case RDMA_CM_EVENT_CONNECT_REQUEST:
 737                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 738                 ret = isert_connect_request(cma_id, event);
 739                 break;
 740         case RDMA_CM_EVENT_ESTABLISHED:
 741                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 742                 isert_connected_handler(cma_id);
 743                 break;
 744         case RDMA_CM_EVENT_DISCONNECTED:
 745                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 746                 isert_disconnected_handler(cma_id);
 747                 break;
 748         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 749         case RDMA_CM_EVENT_ADDR_CHANGE:
 750                 break;
 751         case RDMA_CM_EVENT_CONNECT_ERROR:
 752         default:
 753                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 754                 break;
 755         }
 756
 757         if (ret != 0) {
 758                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 759                        event->event, ret);
 760                 dump_stack();
 761         }
 762
 763         return ret;
 764 }
 765
 766 static int
 767 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 768 {
 769         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 770         int i, ret;
 771         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 772         struct iser_rx_desc *rx_desc;
 773
 774         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 775                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 776                 rx_wr->wr_id    = (unsigned long)rx_desc;
 777                 rx_wr->sg_list  = &rx_desc->rx_sg;
 778                 rx_wr->num_sge  = 1;
 779                 rx_wr->next     = rx_wr + 1;
 780                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 781         }
 782
 783         rx_wr--;
 784         rx_wr->next = NULL; /* mark end of work requests list */
 785
 786         isert_conn->post_recv_buf_count += count;
 787         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 788                                 &rx_wr_failed);
 789         if (ret) {
 790                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 791                 isert_conn->post_recv_buf_count -= count;
 792         } else {
 793                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 794                 isert_conn->conn_rx_desc_head = rx_head;
 795         }
 796         return ret;
 797 }
 798
 799 static int
 800 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 801 {
 802         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 803         struct ib_send_wr send_wr, *send_wr_failed;
 804         int ret;
 805
 806         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 807                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 808
 809         send_wr.next    = NULL;
 810         send_wr.wr_id   = (unsigned long)tx_desc;
 811         send_wr.sg_list = tx_desc->tx_sg;
 812         send_wr.num_sge = tx_desc->num_sge;
 813         send_wr.opcode  = IB_WR_SEND;
 814         send_wr.send_flags = IB_SEND_SIGNALED;
 815
 816         atomic_inc(&isert_conn->post_send_buf_count);
 817
 818         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 819         if (ret) {
 820                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 821                 atomic_dec(&isert_conn->post_send_buf_count);
 822         }
 823
 824         return ret;
 825 }
 826
 827 static void
 828 isert_create_send_desc(struct isert_conn *isert_conn,
 829                        struct isert_cmd *isert_cmd,
 830                        struct iser_tx_desc *tx_desc)
 831 {
 832         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 833
 834         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 835                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 836
 837         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 838         tx_desc->iser_header.flags = ISER_VER;
 839
 840         tx_desc->num_sge = 1;
 841         tx_desc->isert_cmd = isert_cmd;
 842
 843         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 844                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 845                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 846         }
 847 }
 848
 849 static int
 850 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 851                    struct iser_tx_desc *tx_desc)
 852 {
 853         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 854         u64 dma_addr;
 855
 856         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 857                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 858         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 859                 pr_err("ib_dma_mapping_error() failed\n");
 860                 return -ENOMEM;
 861         }
 862
 863         tx_desc->dma_addr = dma_addr;
 864         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 865         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 866         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 867
 868         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 869                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 870                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 871
 872         return 0;
 873 }
 874
 875 static void
 876 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 877                    struct ib_send_wr *send_wr, bool coalesce)
 878 {
 879         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 880
 881         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 882         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 883         send_wr->opcode = IB_WR_SEND;
 884         send_wr->sg_list = &tx_desc->tx_sg[0];
 885         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 886         /*
 887          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 888          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 889          */
 890         mutex_lock(&isert_conn->conn_mutex);
 891         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 892             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 893                 tx_desc->llnode_active = true;
 894                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 895                 mutex_unlock(&isert_conn->conn_mutex);
 896                 return;
 897         }
 898         isert_conn->conn_comp_batch = 0;
 899         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 900         mutex_unlock(&isert_conn->conn_mutex);
 901
 902         send_wr->send_flags = IB_SEND_SIGNALED;
 903 }
 904
 905 static int
 906 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 907 {
 908         struct ib_recv_wr rx_wr, *rx_wr_fail;
 909         struct ib_sge sge;
 910         int ret;
 911
 912         memset(&sge, 0, sizeof(struct ib_sge));
 913         sge.addr = isert_conn->login_req_dma;
 914         sge.length = ISER_RX_LOGIN_SIZE;
 915         sge.lkey = isert_conn->conn_mr->lkey;
 916
 917         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 918                 sge.addr, sge.length, sge.lkey);
 919
 920         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 921         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
 922         rx_wr.sg_list = &sge;
 923         rx_wr.num_sge = 1;
 924
 925         isert_conn->post_recv_buf_count++;
 926         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
 927         if (ret) {
 928                 pr_err("ib_post_recv() failed: %d\n", ret);
 929                 isert_conn->post_recv_buf_count--;
 930         }
 931
 932         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
 933         return ret;
 934 }
 935
 936 static int
 937 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 938                    u32 length)
 939 {
 940         struct isert_conn *isert_conn = conn->context;
 941         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 942         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
 943         int ret;
 944
 945         isert_create_send_desc(isert_conn, NULL, tx_desc);
 946
 947         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 948                sizeof(struct iscsi_hdr));
 949
 950         isert_init_tx_hdrs(isert_conn, tx_desc);
 951
 952         if (length > 0) {
 953                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 954
 955                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 956                                            length, DMA_TO_DEVICE);
 957
 958                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 959
 960                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 961                                               length, DMA_TO_DEVICE);
 962
 963                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 964                 tx_dsg->length  = length;
 965                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
 966                 tx_desc->num_sge = 2;
 967         }
 968         if (!login->login_failed) {
 969                 if (login->login_complete) {
 970                         ret = isert_alloc_rx_descriptors(isert_conn);
 971                         if (ret)
 972                                 return ret;
 973
 974                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
 975                         if (ret)
 976                                 return ret;
 977
 978                         isert_conn->state = ISER_CONN_UP;
 979                         goto post_send;
 980                 }
 981
 982                 ret = isert_rdma_post_recvl(isert_conn);
 983                 if (ret)
 984                         return ret;
 985         }
 986 post_send:
 987         ret = isert_post_send(isert_conn, tx_desc);
 988         if (ret)
 989                 return ret;
 990
 991         return 0;
 992 }
 993
 994 static void
 995 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
 996                    struct isert_conn *isert_conn)
 997 {
 998         struct iscsi_conn *conn = isert_conn->conn;
 999         struct iscsi_login *login = conn->conn_login;
1000         int size;
1001
1002         if (!login) {
1003                 pr_err("conn->conn_login is NULL\n");
1004                 dump_stack();
1005                 return;
1006         }
1007
1008         if (login->first_request) {
1009                 struct iscsi_login_req *login_req =
1010                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1011                 /*
1012                  * Setup the initial iscsi_login values from the leading
1013                  * login request PDU.
1014                  */
1015                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1016                 login->current_stage =
1017                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1018                          >> 2;
1019                 login->version_min      = login_req->min_version;
1020                 login->version_max      = login_req->max_version;
1021                 memcpy(login->isid, login_req->isid, 6);
1022                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1023                 login->init_task_tag    = login_req->itt;
1024                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1025                 login->cid              = be16_to_cpu(login_req->cid);
1026                 login->tsih             = be16_to_cpu(login_req->tsih);
1027         }
1028
1029         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1030
1031         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1032         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1033                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1034         memcpy(login->req_buf, &rx_desc->data[0], size);
1035
1036         if (login->first_request) {
1037                 complete(&isert_conn->conn_login_comp);
1038                 return;
1039         }
1040         schedule_delayed_work(&conn->login_work, 0);
1041 }
1042
1043 static struct iscsi_cmd
1044 *isert_allocate_cmd(struct iscsi_conn *conn)
1045 {
1046         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1047         struct isert_cmd *isert_cmd;
1048         struct iscsi_cmd *cmd;
1049
1050         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1051         if (!cmd) {
1052                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1053                 return NULL;
1054         }
1055         isert_cmd = iscsit_priv_cmd(cmd);
1056         isert_cmd->conn = isert_conn;
1057         isert_cmd->iscsi_cmd = cmd;
1058
1059         return cmd;
1060 }
1061
1062 static int
1063 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1064                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1065                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1066 {
1067         struct iscsi_conn *conn = isert_conn->conn;
1068         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1069         struct scatterlist *sg;
1070         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1071         bool dump_payload = false;
1072
1073         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1074         if (rc < 0)
1075                 return rc;
1076
1077         imm_data = cmd->immediate_data;
1078         imm_data_len = cmd->first_burst_len;
1079         unsol_data = cmd->unsolicited_data;
1080
1081         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1082         if (rc < 0) {
1083                 return 0;
1084         } else if (rc > 0) {
1085                 dump_payload = true;
1086                 goto sequence_cmd;
1087         }
1088
1089         if (!imm_data)
1090                 return 0;
1091
1092         sg = &cmd->se_cmd.t_data_sg[0];
1093         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1094
1095         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1096                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1097
1098         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1099
1100         cmd->write_data_done += imm_data_len;
1101
1102         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1103                 spin_lock_bh(&cmd->istate_lock);
1104                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1105                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1106                 spin_unlock_bh(&cmd->istate_lock);
1107         }
1108
1109 sequence_cmd:
1110         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1111
1112         if (!rc && dump_payload == false && unsol_data)
1113                 iscsit_set_unsoliticed_dataout(cmd);
1114
1115         return 0;
1116 }
1117
1118 static int
1119 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1120                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1121 {
1122         struct scatterlist *sg_start;
1123         struct iscsi_conn *conn = isert_conn->conn;
1124         struct iscsi_cmd *cmd = NULL;
1125         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1126         u32 unsol_data_len = ntoh24(hdr->dlength);
1127         int rc, sg_nents, sg_off, page_off;
1128
1129         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1130         if (rc < 0)
1131                 return rc;
1132         else if (!cmd)
1133                 return 0;
1134         /*
1135          * FIXME: Unexpected unsolicited_data out
1136          */
1137         if (!cmd->unsolicited_data) {
1138                 pr_err("Received unexpected solicited data payload\n");
1139                 dump_stack();
1140                 return -1;
1141         }
1142
1143         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1144                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1145
1146         sg_off = cmd->write_data_done / PAGE_SIZE;
1147         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149         page_off = cmd->write_data_done % PAGE_SIZE;
1150         /*
1151          * FIXME: Non page-aligned unsolicited_data out
1152          */
1153         if (page_off) {
1154                 pr_err("Received unexpected non-page aligned data payload\n");
1155                 dump_stack();
1156                 return -1;
1157         }
1158         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1159                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1160
1161         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1162                             unsol_data_len);
1163
1164         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1165         if (rc < 0)
1166                 return rc;
1167
1168         return 0;
1169 }
1170
1171 static int
1172 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1173                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1174                      unsigned char *buf)
1175 {
1176         struct iscsi_conn *conn = isert_conn->conn;
1177         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1178         int rc;
1179
1180         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1181         if (rc < 0)
1182                 return rc;
1183         /*
1184          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1185          */
1186
1187         return iscsit_process_nop_out(conn, cmd, hdr);
1188 }
1189
1190 static int
1191 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1192                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1193                       struct iscsi_text *hdr)
1194 {
1195         struct iscsi_conn *conn = isert_conn->conn;
1196         u32 payload_length = ntoh24(hdr->dlength);
1197         int rc;
1198         unsigned char *text_in;
1199
1200         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1201         if (rc < 0)
1202                 return rc;
1203
1204         text_in = kzalloc(payload_length, GFP_KERNEL);
1205         if (!text_in) {
1206                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1207                        payload_length);
1208                 return -ENOMEM;
1209         }
1210         cmd->text_in_ptr = text_in;
1211
1212         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1213
1214         return iscsit_process_text_cmd(conn, cmd, hdr);
1215 }
1216
1217 static int
1218 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1219                 uint32_t read_stag, uint64_t read_va,
1220                 uint32_t write_stag, uint64_t write_va)
1221 {
1222         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1223         struct iscsi_conn *conn = isert_conn->conn;
1224         struct iscsi_session *sess = conn->sess;
1225         struct iscsi_cmd *cmd;
1226         struct isert_cmd *isert_cmd;
1227         int ret = -EINVAL;
1228         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1229
1230         if (sess->sess_ops->SessionType &&
1231            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1232                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1233                        " ignoring\n", opcode);
1234                 return 0;
1235         }
1236
1237         switch (opcode) {
1238         case ISCSI_OP_SCSI_CMD:
1239                 cmd = isert_allocate_cmd(conn);
1240                 if (!cmd)
1241                         break;
1242
1243                 isert_cmd = iscsit_priv_cmd(cmd);
1244                 isert_cmd->read_stag = read_stag;
1245                 isert_cmd->read_va = read_va;
1246                 isert_cmd->write_stag = write_stag;
1247                 isert_cmd->write_va = write_va;
1248
1249                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1250                                         rx_desc, (unsigned char *)hdr);
1251                 break;
1252         case ISCSI_OP_NOOP_OUT:
1253                 cmd = isert_allocate_cmd(conn);
1254                 if (!cmd)
1255                         break;
1256
1257                 isert_cmd = iscsit_priv_cmd(cmd);
1258                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1259                                            rx_desc, (unsigned char *)hdr);
1260                 break;
1261         case ISCSI_OP_SCSI_DATA_OUT:
1262                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1263                                                 (unsigned char *)hdr);
1264                 break;
1265         case ISCSI_OP_SCSI_TMFUNC:
1266                 cmd = isert_allocate_cmd(conn);
1267                 if (!cmd)
1268                         break;
1269
1270                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1271                                                 (unsigned char *)hdr);
1272                 break;
1273         case ISCSI_OP_LOGOUT:
1274                 cmd = isert_allocate_cmd(conn);
1275                 if (!cmd)
1276                         break;
1277
1278                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1279                 if (ret > 0)
1280                         wait_for_completion_timeout(&conn->conn_logout_comp,
1281                                                     SECONDS_FOR_LOGOUT_COMP *
1282                                                     HZ);
1283                 break;
1284         case ISCSI_OP_TEXT:
1285                 cmd = isert_allocate_cmd(conn);
1286                 if (!cmd)
1287                         break;
1288
1289                 isert_cmd = iscsit_priv_cmd(cmd);
1290                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1291                                             rx_desc, (struct iscsi_text *)hdr);
1292                 break;
1293         default:
1294                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1295                 dump_stack();
1296                 break;
1297         }
1298
1299         return ret;
1300 }
1301
1302 static void
1303 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1304 {
1305         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1306         uint64_t read_va = 0, write_va = 0;
1307         uint32_t read_stag = 0, write_stag = 0;
1308         int rc;
1309
1310         switch (iser_hdr->flags & 0xF0) {
1311         case ISCSI_CTRL:
1312                 if (iser_hdr->flags & ISER_RSV) {
1313                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1314                         read_va = be64_to_cpu(iser_hdr->read_va);
1315                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1316                                  read_stag, (unsigned long long)read_va);
1317                 }
1318                 if (iser_hdr->flags & ISER_WSV) {
1319                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1320                         write_va = be64_to_cpu(iser_hdr->write_va);
1321                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1322                                  write_stag, (unsigned long long)write_va);
1323                 }
1324
1325                 pr_debug("ISER ISCSI_CTRL PDU\n");
1326                 break;
1327         case ISER_HELLO:
1328                 pr_err("iSER Hello message\n");
1329                 break;
1330         default:
1331                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1332                 break;
1333         }
1334
1335         rc = isert_rx_opcode(isert_conn, rx_desc,
1336                              read_stag, read_va, write_stag, write_va);
1337 }
1338
1339 static void
1340 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1341                     unsigned long xfer_len)
1342 {
1343         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1344         struct iscsi_hdr *hdr;
1345         u64 rx_dma;
1346         int rx_buflen, outstanding;
1347
1348         if ((char *)desc == isert_conn->login_req_buf) {
1349                 rx_dma = isert_conn->login_req_dma;
1350                 rx_buflen = ISER_RX_LOGIN_SIZE;
1351                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1352                          rx_dma, rx_buflen);
1353         } else {
1354                 rx_dma = desc->dma_addr;
1355                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1356                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1357                          rx_dma, rx_buflen);
1358         }
1359
1360         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1361
1362         hdr = &desc->iscsi_header;
1363         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1364                  hdr->opcode, hdr->itt, hdr->flags,
1365                  (int)(xfer_len - ISER_HEADERS_LEN));
1366
1367         if ((char *)desc == isert_conn->login_req_buf)
1368                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1369                                    isert_conn);
1370         else
1371                 isert_rx_do_work(desc, isert_conn);
1372
1373         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1374                                       DMA_FROM_DEVICE);
1375
1376         isert_conn->post_recv_buf_count--;
1377         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1378                  isert_conn->post_recv_buf_count);
1379
1380         if ((char *)desc == isert_conn->login_req_buf)
1381                 return;
1382
1383         outstanding = isert_conn->post_recv_buf_count;
1384         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1385                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1386                                 ISERT_MIN_POSTED_RX);
1387                 err = isert_post_recv(isert_conn, count);
1388                 if (err) {
1389                         pr_err("isert_post_recv() count: %d failed, %d\n",
1390                                count, err);
1391                 }
1392         }
1393 }
1394
1395 static void
1396 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1397 {
1398         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1399         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1400
1401         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1402         if (wr->sge) {
1403                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1404                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1405                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1406                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1407                 wr->sge = NULL;
1408         }
1409
1410         if (wr->send_wr) {
1411                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1412                 kfree(wr->send_wr);
1413                 wr->send_wr = NULL;
1414         }
1415
1416         if (wr->ib_sge) {
1417                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1418                 kfree(wr->ib_sge);
1419                 wr->ib_sge = NULL;
1420         }
1421 }
1422
1423 static void
1424 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1425 {
1426         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1427         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1428         LIST_HEAD(unmap_list);
1429
1430         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1431
1432         if (wr->fr_desc) {
1433                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1434                          isert_cmd, wr->fr_desc);
1435                 spin_lock_bh(&isert_conn->conn_lock);
1436                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1437                 spin_unlock_bh(&isert_conn->conn_lock);
1438                 wr->fr_desc = NULL;
1439         }
1440
1441         if (wr->sge) {
1442                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1443                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1444                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1445                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1446                 wr->sge = NULL;
1447         }
1448
1449         wr->ib_sge = NULL;
1450         wr->send_wr = NULL;
1451 }
1452
1453 static void
1454 isert_put_cmd(struct isert_cmd *isert_cmd)
1455 {
1456         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1457         struct isert_conn *isert_conn = isert_cmd->conn;
1458         struct iscsi_conn *conn = isert_conn->conn;
1459         struct isert_device *device = isert_conn->conn_device;
1460
1461         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1462
1463         switch (cmd->iscsi_opcode) {
1464         case ISCSI_OP_SCSI_CMD:
1465                 spin_lock_bh(&conn->cmd_lock);
1466                 if (!list_empty(&cmd->i_conn_node))
1467                         list_del_init(&cmd->i_conn_node);
1468                 spin_unlock_bh(&conn->cmd_lock);
1469
1470                 if (cmd->data_direction == DMA_TO_DEVICE)
1471                         iscsit_stop_dataout_timer(cmd);
1472
1473                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1474                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1475                 break;
1476         case ISCSI_OP_SCSI_TMFUNC:
1477                 spin_lock_bh(&conn->cmd_lock);
1478                 if (!list_empty(&cmd->i_conn_node))
1479                         list_del_init(&cmd->i_conn_node);
1480                 spin_unlock_bh(&conn->cmd_lock);
1481
1482                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1483                 break;
1484         case ISCSI_OP_REJECT:
1485         case ISCSI_OP_NOOP_OUT:
1486         case ISCSI_OP_TEXT:
1487                 spin_lock_bh(&conn->cmd_lock);
1488                 if (!list_empty(&cmd->i_conn_node))
1489                         list_del_init(&cmd->i_conn_node);
1490                 spin_unlock_bh(&conn->cmd_lock);
1491
1492                 /*
1493                  * Handle special case for REJECT when iscsi_add_reject*() has
1494                  * overwritten the original iscsi_opcode assignment, and the
1495                  * associated cmd->se_cmd needs to be released.
1496                  */
1497                 if (cmd->se_cmd.se_tfo != NULL) {
1498                         pr_debug("Calling transport_generic_free_cmd from"
1499                                  " isert_put_cmd for 0x%02x\n",
1500                                  cmd->iscsi_opcode);
1501                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1502                         break;
1503                 }
1504                 /*
1505                  * Fall-through
1506                  */
1507         default:
1508                 iscsit_release_cmd(cmd);
1509                 break;
1510         }
1511 }
1512
1513 static void
1514 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1515 {
1516         if (tx_desc->dma_addr != 0) {
1517                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1518                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1519                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1520                 tx_desc->dma_addr = 0;
1521         }
1522 }
1523
1524 static void
1525 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1526                      struct ib_device *ib_dev)
1527 {
1528         if (isert_cmd->pdu_buf_dma != 0) {
1529                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1530                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1531                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1532                 isert_cmd->pdu_buf_dma = 0;
1533         }
1534
1535         isert_unmap_tx_desc(tx_desc, ib_dev);
1536         isert_put_cmd(isert_cmd);
1537 }
1538
1539 static void
1540 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1541                            struct isert_cmd *isert_cmd)
1542 {
1543         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1544         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1545         struct se_cmd *se_cmd = &cmd->se_cmd;
1546         struct isert_conn *isert_conn = isert_cmd->conn;
1547         struct isert_device *device = isert_conn->conn_device;
1548
1549         iscsit_stop_dataout_timer(cmd);
1550         device->unreg_rdma_mem(isert_cmd, isert_conn);
1551         cmd->write_data_done = wr->cur_rdma_length;
1552         wr->send_wr_num = 0;
1553
1554         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1555         spin_lock_bh(&cmd->istate_lock);
1556         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1557         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1558         spin_unlock_bh(&cmd->istate_lock);
1559
1560         target_execute_cmd(se_cmd);
1561 }
1562
1563 static void
1564 isert_do_control_comp(struct work_struct *work)
1565 {
1566         struct isert_cmd *isert_cmd = container_of(work,
1567                         struct isert_cmd, comp_work);
1568         struct isert_conn *isert_conn = isert_cmd->conn;
1569         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1570         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1571
1572         switch (cmd->i_state) {
1573         case ISTATE_SEND_TASKMGTRSP:
1574                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1575
1576                 atomic_dec(&isert_conn->post_send_buf_count);
1577                 iscsit_tmr_post_handler(cmd, cmd->conn);
1578
1579                 cmd->i_state = ISTATE_SENT_STATUS;
1580                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1581                 break;
1582         case ISTATE_SEND_REJECT:
1583                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1584                 atomic_dec(&isert_conn->post_send_buf_count);
1585
1586                 cmd->i_state = ISTATE_SENT_STATUS;
1587                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1588                 break;
1589         case ISTATE_SEND_LOGOUTRSP:
1590                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1591                 /*
1592                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1593                  * from isert_wait_conn()
1594                  */
1595                 isert_conn->logout_posted = true;
1596                 iscsit_logout_post_handler(cmd, cmd->conn);
1597                 break;
1598         case ISTATE_SEND_TEXTRSP:
1599                 atomic_dec(&isert_conn->post_send_buf_count);
1600                 cmd->i_state = ISTATE_SENT_STATUS;
1601                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1602                 break;
1603         default:
1604                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1605                 dump_stack();
1606                 break;
1607         }
1608 }
1609
1610 static void
1611 isert_response_completion(struct iser_tx_desc *tx_desc,
1612                           struct isert_cmd *isert_cmd,
1613                           struct isert_conn *isert_conn,
1614                           struct ib_device *ib_dev)
1615 {
1616         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1617         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1618
1619         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1620             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1621             cmd->i_state == ISTATE_SEND_REJECT ||
1622             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1623                 isert_unmap_tx_desc(tx_desc, ib_dev);
1624
1625                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1626                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1627                 return;
1628         }
1629         atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1630
1631         cmd->i_state = ISTATE_SENT_STATUS;
1632         isert_completion_put(tx_desc, isert_cmd, ib_dev);
1633 }
1634
1635 static void
1636 __isert_send_completion(struct iser_tx_desc *tx_desc,
1637                         struct isert_conn *isert_conn)
1638 {
1639         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1640         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1641         struct isert_rdma_wr *wr;
1642
1643         if (!isert_cmd) {
1644                 atomic_dec(&isert_conn->post_send_buf_count);
1645                 isert_unmap_tx_desc(tx_desc, ib_dev);
1646                 return;
1647         }
1648         wr = &isert_cmd->rdma_wr;
1649
1650         switch (wr->iser_ib_op) {
1651         case ISER_IB_RECV:
1652                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1653                 dump_stack();
1654                 break;
1655         case ISER_IB_SEND:
1656                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1657                 isert_response_completion(tx_desc, isert_cmd,
1658                                           isert_conn, ib_dev);
1659                 break;
1660         case ISER_IB_RDMA_WRITE:
1661                 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1662                 dump_stack();
1663                 break;
1664         case ISER_IB_RDMA_READ:
1665                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1666
1667                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1668                 isert_completion_rdma_read(tx_desc, isert_cmd);
1669                 break;
1670         default:
1671                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1672                 dump_stack();
1673                 break;
1674         }
1675 }
1676
1677 static void
1678 isert_send_completion(struct iser_tx_desc *tx_desc,
1679                       struct isert_conn *isert_conn)
1680 {
1681         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1682         struct iser_tx_desc *t;
1683         /*
1684          * Drain coalesced completion llist starting from comp_llnode_batch
1685          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1686          */
1687         while (llnode) {
1688                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1689                 llnode = llist_next(llnode);
1690                 __isert_send_completion(t, isert_conn);
1691         }
1692         __isert_send_completion(tx_desc, isert_conn);
1693 }
1694
1695 static void
1696 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1697 {
1698         struct llist_node *llnode;
1699         struct isert_rdma_wr *wr;
1700         struct iser_tx_desc *t;
1701
1702         mutex_lock(&isert_conn->conn_mutex);
1703         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1704         isert_conn->conn_comp_batch = 0;
1705         mutex_unlock(&isert_conn->conn_mutex);
1706
1707         while (llnode) {
1708                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1709                 llnode = llist_next(llnode);
1710                 wr = &t->isert_cmd->rdma_wr;
1711
1712                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1713                 isert_completion_put(t, t->isert_cmd, ib_dev);
1714         }
1715 }
1716
1717 static void
1718 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1719 {
1720         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1721         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1722         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1723         struct isert_rdma_wr *wr;
1724         struct iser_tx_desc *t;
1725
1726         while (llnode) {
1727                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1728                 llnode = llist_next(llnode);
1729                 wr = &t->isert_cmd->rdma_wr;
1730
1731                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1732                 isert_completion_put(t, t->isert_cmd, ib_dev);
1733         }
1734         tx_desc->comp_llnode_batch = NULL;
1735
1736         if (!isert_cmd)
1737                 isert_unmap_tx_desc(tx_desc, ib_dev);
1738         else
1739                 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1740 }
1741
1742 static void
1743 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1744 {
1745         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1746         struct iscsi_conn *conn = isert_conn->conn;
1747
1748         if (isert_conn->post_recv_buf_count)
1749                 return;
1750
1751         isert_cq_drain_comp_llist(isert_conn, ib_dev);
1752
1753         if (conn->sess) {
1754                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1755                 target_wait_for_sess_cmds(conn->sess->se_sess);
1756         }
1757
1758         while (atomic_read(&isert_conn->post_send_buf_count))
1759                 msleep(3000);
1760
1761         mutex_lock(&isert_conn->conn_mutex);
1762         isert_conn->state = ISER_CONN_DOWN;
1763         mutex_unlock(&isert_conn->conn_mutex);
1764
1765         complete(&isert_conn->conn_wait_comp_err);
1766 }
1767
1768 static void
1769 isert_cq_tx_work(struct work_struct *work)
1770 {
1771         struct isert_cq_desc *cq_desc = container_of(work,
1772                                 struct isert_cq_desc, cq_tx_work);
1773         struct isert_device *device = cq_desc->device;
1774         int cq_index = cq_desc->cq_index;
1775         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1776         struct isert_conn *isert_conn;
1777         struct iser_tx_desc *tx_desc;
1778         struct ib_wc wc;
1779
1780         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1781                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1782                 isert_conn = wc.qp->qp_context;
1783
1784                 if (wc.status == IB_WC_SUCCESS) {
1785                         isert_send_completion(tx_desc, isert_conn);
1786                 } else {
1787                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1788                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
1789                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1790
1791                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
1792                                 if (tx_desc->llnode_active)
1793                                         continue;
1794
1795                                 atomic_dec(&isert_conn->post_send_buf_count);
1796                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
1797                         }
1798                 }
1799         }
1800
1801         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1802 }
1803
1804 static void
1805 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1806 {
1807         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1808
1809         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1810 }
1811
1812 static void
1813 isert_cq_rx_work(struct work_struct *work)
1814 {
1815         struct isert_cq_desc *cq_desc = container_of(work,
1816                         struct isert_cq_desc, cq_rx_work);
1817         struct isert_device *device = cq_desc->device;
1818         int cq_index = cq_desc->cq_index;
1819         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1820         struct isert_conn *isert_conn;
1821         struct iser_rx_desc *rx_desc;
1822         struct ib_wc wc;
1823         unsigned long xfer_len;
1824
1825         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1826                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1827                 isert_conn = wc.qp->qp_context;
1828
1829                 if (wc.status == IB_WC_SUCCESS) {
1830                         xfer_len = (unsigned long)wc.byte_len;
1831                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
1832                 } else {
1833                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1834                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
1835                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1836                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
1837                                          wc.vendor_err);
1838                         }
1839                         isert_conn->post_recv_buf_count--;
1840                         isert_cq_rx_comp_err(isert_conn);
1841                 }
1842         }
1843
1844         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1845 }
1846
1847 static void
1848 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1849 {
1850         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1851
1852         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1853 }
1854
1855 static int
1856 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1857 {
1858         struct ib_send_wr *wr_failed;
1859         int ret;
1860
1861         atomic_inc(&isert_conn->post_send_buf_count);
1862
1863         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1864                            &wr_failed);
1865         if (ret) {
1866                 pr_err("ib_post_send failed with %d\n", ret);
1867                 atomic_dec(&isert_conn->post_send_buf_count);
1868                 return ret;
1869         }
1870         return ret;
1871 }
1872
1873 static int
1874 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1875 {
1876         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1877         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1878         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1879         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1880                                 &isert_cmd->tx_desc.iscsi_header;
1881
1882         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1883         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1884         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1885         /*
1886          * Attach SENSE DATA payload to iSCSI Response PDU
1887          */
1888         if (cmd->se_cmd.sense_buffer &&
1889             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1890             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1891                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1892                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1893                 u32 padding, pdu_len;
1894
1895                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1896                                    cmd->sense_buffer);
1897                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1898
1899                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1900                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1901                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1902
1903                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1904                                 (void *)cmd->sense_buffer, pdu_len,
1905                                 DMA_TO_DEVICE);
1906
1907                 isert_cmd->pdu_buf_len = pdu_len;
1908                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1909                 tx_dsg->length  = pdu_len;
1910                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1911                 isert_cmd->tx_desc.num_sge = 2;
1912         }
1913
1914         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
1915
1916         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1917
1918         return isert_post_response(isert_conn, isert_cmd);
1919 }
1920
1921 static int
1922 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1923                 bool nopout_response)
1924 {
1925         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1926         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1927         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1928
1929         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1930         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1931                                &isert_cmd->tx_desc.iscsi_header,
1932                                nopout_response);
1933         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1934         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1935
1936         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1937
1938         return isert_post_response(isert_conn, isert_cmd);
1939 }
1940
1941 static int
1942 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1943 {
1944         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1945         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1946         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1947
1948         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1949         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1950                                 &isert_cmd->tx_desc.iscsi_header);
1951         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1952         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1953
1954         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1955
1956         return isert_post_response(isert_conn, isert_cmd);
1957 }
1958
1959 static int
1960 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1961 {
1962         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1963         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1964         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1965
1966         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1967         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1968                                   &isert_cmd->tx_desc.iscsi_header);
1969         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1970         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1971
1972         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1973
1974         return isert_post_response(isert_conn, isert_cmd);
1975 }
1976
1977 static int
1978 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1979 {
1980         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1981         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1982         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1983         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1984         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1985         struct iscsi_reject *hdr =
1986                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1987
1988         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1989         iscsit_build_reject(cmd, conn, hdr);
1990         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1991
1992         hton24(hdr->dlength, ISCSI_HDR_LEN);
1993         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1994                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1995                         DMA_TO_DEVICE);
1996         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1997         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1998         tx_dsg->length  = ISCSI_HDR_LEN;
1999         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2000         isert_cmd->tx_desc.num_sge = 2;
2001
2002         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2003
2004         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2005
2006         return isert_post_response(isert_conn, isert_cmd);
2007 }
2008
2009 static int
2010 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2011 {
2012         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2013         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2014         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2015         struct iscsi_text_rsp *hdr =
2016                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2017         u32 txt_rsp_len;
2018         int rc;
2019
2020         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2021         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2022         if (rc < 0)
2023                 return rc;
2024
2025         txt_rsp_len = rc;
2026         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2027
2028         if (txt_rsp_len) {
2029                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2030                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2031                 void *txt_rsp_buf = cmd->buf_ptr;
2032
2033                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2034                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2035
2036                 isert_cmd->pdu_buf_len = txt_rsp_len;
2037                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2038                 tx_dsg->length  = txt_rsp_len;
2039                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2040                 isert_cmd->tx_desc.num_sge = 2;
2041         }
2042         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2043
2044         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2045
2046         return isert_post_response(isert_conn, isert_cmd);
2047 }
2048
2049 static int
2050 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2051                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2052                     u32 data_left, u32 offset)
2053 {
2054         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2055         struct scatterlist *sg_start, *tmp_sg;
2056         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2057         u32 sg_off, page_off;
2058         int i = 0, sg_nents;
2059
2060         sg_off = offset / PAGE_SIZE;
2061         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2062         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2063         page_off = offset % PAGE_SIZE;
2064
2065         send_wr->sg_list = ib_sge;
2066         send_wr->num_sge = sg_nents;
2067         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2068         /*
2069          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2070          */
2071         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2072                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2073                          (unsigned long long)tmp_sg->dma_address,
2074                          tmp_sg->length, page_off);
2075
2076                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2077                 ib_sge->length = min_t(u32, data_left,
2078                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2079                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2080
2081                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2082                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2083                 page_off = 0;
2084                 data_left -= ib_sge->length;
2085                 ib_sge++;
2086                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2087         }
2088
2089         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2090                  send_wr->sg_list, send_wr->num_sge);
2091
2092         return sg_nents;
2093 }
2094
2095 static int
2096 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2097                struct isert_rdma_wr *wr)
2098 {
2099         struct se_cmd *se_cmd = &cmd->se_cmd;
2100         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2101         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2102         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2103         struct ib_send_wr *send_wr;
2104         struct ib_sge *ib_sge;
2105         struct scatterlist *sg_start;
2106         u32 sg_off = 0, sg_nents;
2107         u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
2108         int ret = 0, count, i, ib_sge_cnt;
2109
2110         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2111                 data_left = se_cmd->data_length;
2112         } else {
2113                 sg_off = cmd->write_data_done / PAGE_SIZE;
2114                 data_left = se_cmd->data_length - cmd->write_data_done;
2115                 offset = cmd->write_data_done;
2116                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2117         }
2118
2119         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2120         sg_nents = se_cmd->t_data_nents - sg_off;
2121
2122         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2123                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2124                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2125         if (unlikely(!count)) {
2126                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2127                 return -EINVAL;
2128         }
2129         wr->sge = sg_start;
2130         wr->num_sge = sg_nents;
2131         wr->cur_rdma_length = data_left;
2132         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2133                  isert_cmd, count, sg_start, sg_nents, data_left);
2134
2135         ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2136         if (!ib_sge) {
2137                 pr_warn("Unable to allocate ib_sge\n");
2138                 ret = -ENOMEM;
2139                 goto unmap_sg;
2140         }
2141         wr->ib_sge = ib_sge;
2142
2143         wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2144         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2145                                 GFP_KERNEL);
2146         if (!wr->send_wr) {
2147                 pr_debug("Unable to allocate wr->send_wr\n");
2148                 ret = -ENOMEM;
2149                 goto unmap_sg;
2150         }
2151
2152         wr->isert_cmd = isert_cmd;
2153         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2154
2155         for (i = 0; i < wr->send_wr_num; i++) {
2156                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2157                 data_len = min(data_left, rdma_write_max);
2158
2159                 send_wr->send_flags = 0;
2160                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2161                         send_wr->opcode = IB_WR_RDMA_WRITE;
2162                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2163                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2164                         if (i + 1 == wr->send_wr_num)
2165                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2166                         else
2167                                 send_wr->next = &wr->send_wr[i + 1];
2168                 } else {
2169                         send_wr->opcode = IB_WR_RDMA_READ;
2170                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2171                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2172                         if (i + 1 == wr->send_wr_num)
2173                                 send_wr->send_flags = IB_SEND_SIGNALED;
2174                         else
2175                                 send_wr->next = &wr->send_wr[i + 1];
2176                 }
2177
2178                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2179                                         send_wr, data_len, offset);
2180                 ib_sge += ib_sge_cnt;
2181
2182                 offset += data_len;
2183                 va_offset += data_len;
2184                 data_left -= data_len;
2185         }
2186
2187         return 0;
2188 unmap_sg:
2189         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2190                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2191                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2192         return ret;
2193 }
2194
2195 static int
2196 isert_map_fr_pagelist(struct ib_device *ib_dev,
2197                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2198 {
2199         u64 start_addr, end_addr, page, chunk_start = 0;
2200         struct scatterlist *tmp_sg;
2201         int i = 0, new_chunk, last_ent, n_pages;
2202
2203         n_pages = 0;
2204         new_chunk = 1;
2205         last_ent = sg_nents - 1;
2206         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2207                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2208                 if (new_chunk)
2209                         chunk_start = start_addr;
2210                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2211
2212                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2213                          i, (unsigned long long)tmp_sg->dma_address,
2214                          tmp_sg->length);
2215
2216                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2217                         new_chunk = 0;
2218                         continue;
2219                 }
2220                 new_chunk = 1;
2221
2222                 page = chunk_start & PAGE_MASK;
2223                 do {
2224                         fr_pl[n_pages++] = page;
2225                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2226                                  n_pages - 1, page);
2227                         page += PAGE_SIZE;
2228                 } while (page < end_addr);
2229         }
2230
2231         return n_pages;
2232 }
2233
2234 static int
2235 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
2236                   struct isert_conn *isert_conn, struct scatterlist *sg_start,
2237                   struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
2238                   unsigned int data_len)
2239 {
2240         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2241         struct ib_send_wr fr_wr, inv_wr;
2242         struct ib_send_wr *bad_wr, *wr = NULL;
2243         int ret, pagelist_len;
2244         u32 page_off;
2245         u8 key;
2246
2247         sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
2248         page_off = offset % PAGE_SIZE;
2249
2250         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2251                  fr_desc, sg_nents, offset);
2252
2253         pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2254                                              &fr_desc->data_frpl->page_list[0]);
2255
2256         if (!fr_desc->valid) {
2257                 memset(&inv_wr, 0, sizeof(inv_wr));
2258                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2259                 inv_wr.opcode = IB_WR_LOCAL_INV;
2260                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2261                 wr = &inv_wr;
2262                 /* Bump the key */
2263                 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2264                 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2265         }
2266
2267         /* Prepare FASTREG WR */
2268         memset(&fr_wr, 0, sizeof(fr_wr));
2269         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2270         fr_wr.opcode = IB_WR_FAST_REG_MR;
2271         fr_wr.wr.fast_reg.iova_start =
2272                 fr_desc->data_frpl->page_list[0] + page_off;
2273         fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2274         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2275         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2276         fr_wr.wr.fast_reg.length = data_len;
2277         fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2278         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2279
2280         if (!wr)
2281                 wr = &fr_wr;
2282         else
2283                 wr->next = &fr_wr;
2284
2285         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2286         if (ret) {
2287                 pr_err("fast registration failed, ret:%d\n", ret);
2288                 return ret;
2289         }
2290         fr_desc->valid = false;
2291
2292         ib_sge->lkey = fr_desc->data_mr->lkey;
2293         ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2294         ib_sge->length = data_len;
2295
2296         pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2297                  ib_sge->addr, ib_sge->length, ib_sge->lkey);
2298
2299         return ret;
2300 }
2301
2302 static int
2303 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2304                struct isert_rdma_wr *wr)
2305 {
2306         struct se_cmd *se_cmd = &cmd->se_cmd;
2307         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2308         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2309         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2310         struct ib_send_wr *send_wr;
2311         struct ib_sge *ib_sge;
2312         struct scatterlist *sg_start;
2313         struct fast_reg_descriptor *fr_desc;
2314         u32 sg_off = 0, sg_nents;
2315         u32 offset = 0, data_len, data_left, rdma_write_max;
2316         int ret = 0, count;
2317         unsigned long flags;
2318
2319         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2320                 data_left = se_cmd->data_length;
2321         } else {
2322                 offset = cmd->write_data_done;
2323                 sg_off = offset / PAGE_SIZE;
2324                 data_left = se_cmd->data_length - cmd->write_data_done;
2325                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2326         }
2327
2328         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2329         sg_nents = se_cmd->t_data_nents - sg_off;
2330
2331         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2332                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2333                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2334         if (unlikely(!count)) {
2335                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2336                 return -EINVAL;
2337         }
2338         wr->sge = sg_start;
2339         wr->num_sge = sg_nents;
2340         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2341                  isert_cmd, count, sg_start, sg_nents, data_left);
2342
2343         memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2344         ib_sge = &wr->s_ib_sge;
2345         wr->ib_sge = ib_sge;
2346
2347         wr->send_wr_num = 1;
2348         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2349         wr->send_wr = &wr->s_send_wr;
2350
2351         wr->isert_cmd = isert_cmd;
2352         rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2353
2354         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2355         send_wr->sg_list = ib_sge;
2356         send_wr->num_sge = 1;
2357         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2358         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2359                 send_wr->opcode = IB_WR_RDMA_WRITE;
2360                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2361                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2362                 send_wr->send_flags = 0;
2363                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2364         } else {
2365                 send_wr->opcode = IB_WR_RDMA_READ;
2366                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2367                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2368                 send_wr->send_flags = IB_SEND_SIGNALED;
2369         }
2370
2371         data_len = min(data_left, rdma_write_max);
2372         wr->cur_rdma_length = data_len;
2373
2374         /* if there is a single dma entry, dma mr is sufficient */
2375         if (count == 1) {
2376                 ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
2377                 ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
2378                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2379                 wr->fr_desc = NULL;
2380         } else {
2381                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2382                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2383                                            struct fast_reg_descriptor, list);
2384                 list_del(&fr_desc->list);
2385                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2386                 wr->fr_desc = fr_desc;
2387
2388                 ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
2389                                         ib_sge, sg_nents, offset, data_len);
2390                 if (ret) {
2391                         list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2392                         goto unmap_sg;
2393                 }
2394         }
2395
2396         return 0;
2397
2398 unmap_sg:
2399         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2400                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2401                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2402         return ret;
2403 }
2404
2405 static int
2406 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2407 {
2408         struct se_cmd *se_cmd = &cmd->se_cmd;
2409         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2410         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2411         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2412         struct isert_device *device = isert_conn->conn_device;
2413         struct ib_send_wr *wr_failed;
2414         int rc;
2415
2416         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2417                  isert_cmd, se_cmd->data_length);
2418         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2419         rc = device->reg_rdma_mem(conn, cmd, wr);
2420         if (rc) {
2421                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2422                 return rc;
2423         }
2424
2425         /*
2426          * Build isert_conn->tx_desc for iSCSI response PDU and attach
2427          */
2428         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2429         iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2430                              &isert_cmd->tx_desc.iscsi_header);
2431         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2432         isert_init_send_wr(isert_conn, isert_cmd,
2433                            &isert_cmd->tx_desc.send_wr, true);
2434
2435         atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2436
2437         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2438         if (rc) {
2439                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2440                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2441         }
2442         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2443                  isert_cmd);
2444
2445         return 1;
2446 }
2447
2448 static int
2449 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2450 {
2451         struct se_cmd *se_cmd = &cmd->se_cmd;
2452         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2453         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2454         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2455         struct isert_device *device = isert_conn->conn_device;
2456         struct ib_send_wr *wr_failed;
2457         int rc;
2458
2459         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2460                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2461         wr->iser_ib_op = ISER_IB_RDMA_READ;
2462         rc = device->reg_rdma_mem(conn, cmd, wr);
2463         if (rc) {
2464                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2465                 return rc;
2466         }
2467
2468         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2469
2470         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2471         if (rc) {
2472                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2473                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2474         }
2475         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2476                  isert_cmd);
2477
2478         return 0;
2479 }
2480
2481 static int
2482 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2483 {
2484         int ret;
2485
2486         switch (state) {
2487         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2488                 ret = isert_put_nopin(cmd, conn, false);
2489                 break;
2490         default:
2491                 pr_err("Unknown immediate state: 0x%02x\n", state);
2492                 ret = -EINVAL;
2493                 break;
2494         }
2495
2496         return ret;
2497 }
2498
2499 static int
2500 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2501 {
2502         int ret;
2503
2504         switch (state) {
2505         case ISTATE_SEND_LOGOUTRSP:
2506                 ret = isert_put_logout_rsp(cmd, conn);
2507                 if (!ret) {
2508                         pr_debug("Returning iSER Logout -EAGAIN\n");
2509                         ret = -EAGAIN;
2510                 }
2511                 break;
2512         case ISTATE_SEND_NOPIN:
2513                 ret = isert_put_nopin(cmd, conn, true);
2514                 break;
2515         case ISTATE_SEND_TASKMGTRSP:
2516                 ret = isert_put_tm_rsp(cmd, conn);
2517                 break;
2518         case ISTATE_SEND_REJECT:
2519                 ret = isert_put_reject(cmd, conn);
2520                 break;
2521         case ISTATE_SEND_TEXTRSP:
2522                 ret = isert_put_text_rsp(cmd, conn);
2523                 break;
2524         case ISTATE_SEND_STATUS:
2525                 /*
2526                  * Special case for sending non GOOD SCSI status from TX thread
2527                  * context during pre se_cmd excecution failure.
2528                  */
2529                 ret = isert_put_response(conn, cmd);
2530                 break;
2531         default:
2532                 pr_err("Unknown response state: 0x%02x\n", state);
2533                 ret = -EINVAL;
2534                 break;
2535         }
2536
2537         return ret;
2538 }
2539
2540 static int
2541 isert_setup_np(struct iscsi_np *np,
2542                struct __kernel_sockaddr_storage *ksockaddr)
2543 {
2544         struct isert_np *isert_np;
2545         struct rdma_cm_id *isert_lid;
2546         struct sockaddr *sa;
2547         int ret;
2548
2549         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2550         if (!isert_np) {
2551                 pr_err("Unable to allocate struct isert_np\n");
2552                 return -ENOMEM;
2553         }
2554         init_waitqueue_head(&isert_np->np_accept_wq);
2555         mutex_init(&isert_np->np_accept_mutex);
2556         INIT_LIST_HEAD(&isert_np->np_accept_list);
2557         init_completion(&isert_np->np_login_comp);
2558
2559         sa = (struct sockaddr *)ksockaddr;
2560         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2561         /*
2562          * Setup the np->np_sockaddr from the passed sockaddr setup
2563          * in iscsi_target_configfs.c code..
2564          */
2565         memcpy(&np->np_sockaddr, ksockaddr,
2566                sizeof(struct __kernel_sockaddr_storage));
2567
2568         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2569                                 IB_QPT_RC);
2570         if (IS_ERR(isert_lid)) {
2571                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2572                        PTR_ERR(isert_lid));
2573                 ret = PTR_ERR(isert_lid);
2574                 goto out;
2575         }
2576
2577         ret = rdma_bind_addr(isert_lid, sa);
2578         if (ret) {
2579                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2580                 goto out_lid;
2581         }
2582
2583         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2584         if (ret) {
2585                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2586                 goto out_lid;
2587         }
2588
2589         isert_np->np_cm_id = isert_lid;
2590         np->np_context = isert_np;
2591         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2592
2593         return 0;
2594
2595 out_lid:
2596         rdma_destroy_id(isert_lid);
2597 out:
2598         kfree(isert_np);
2599         return ret;
2600 }
2601
2602 static int
2603 isert_check_accept_queue(struct isert_np *isert_np)
2604 {
2605         int empty;
2606
2607         mutex_lock(&isert_np->np_accept_mutex);
2608         empty = list_empty(&isert_np->np_accept_list);
2609         mutex_unlock(&isert_np->np_accept_mutex);
2610
2611         return empty;
2612 }
2613
2614 static int
2615 isert_rdma_accept(struct isert_conn *isert_conn)
2616 {
2617         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2618         struct rdma_conn_param cp;
2619         int ret;
2620
2621         memset(&cp, 0, sizeof(struct rdma_conn_param));
2622         cp.responder_resources = isert_conn->responder_resources;
2623         cp.initiator_depth = isert_conn->initiator_depth;
2624         cp.retry_count = 7;
2625         cp.rnr_retry_count = 7;
2626
2627         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2628
2629         ret = rdma_accept(cm_id, &cp);
2630         if (ret) {
2631                 pr_err("rdma_accept() failed with: %d\n", ret);
2632                 return ret;
2633         }
2634
2635         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2636
2637         return 0;
2638 }
2639
2640 static int
2641 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2642 {
2643         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2644         int ret;
2645
2646         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2647         /*
2648          * For login requests after the first PDU, isert_rx_login_req() will
2649          * kick schedule_delayed_work(&conn->login_work) as the packet is
2650          * received, which turns this callback from iscsi_target_do_login_rx()
2651          * into a NOP.
2652          */
2653         if (!login->first_request)
2654                 return 0;
2655
2656         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2657         if (ret)
2658                 return ret;
2659
2660         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2661         return 0;
2662 }
2663
2664 static void
2665 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2666                     struct isert_conn *isert_conn)
2667 {
2668         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2669         struct rdma_route *cm_route = &cm_id->route;
2670         struct sockaddr_in *sock_in;
2671         struct sockaddr_in6 *sock_in6;
2672
2673         conn->login_family = np->np_sockaddr.ss_family;
2674
2675         if (np->np_sockaddr.ss_family == AF_INET6) {
2676                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2677                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2678                          &sock_in6->sin6_addr.in6_u);
2679                 conn->login_port = ntohs(sock_in6->sin6_port);
2680
2681                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2682                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2683                          &sock_in6->sin6_addr.in6_u);
2684                 conn->local_port = ntohs(sock_in6->sin6_port);
2685         } else {
2686                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2687                 sprintf(conn->login_ip, "%pI4",
2688                         &sock_in->sin_addr.s_addr);
2689                 conn->login_port = ntohs(sock_in->sin_port);
2690
2691                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2692                 sprintf(conn->local_ip, "%pI4",
2693                         &sock_in->sin_addr.s_addr);
2694                 conn->local_port = ntohs(sock_in->sin_port);
2695         }
2696 }
2697
2698 static int
2699 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2700 {
2701         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2702         struct isert_conn *isert_conn;
2703         int max_accept = 0, ret;
2704
2705 accept_wait:
2706         ret = wait_event_interruptible(isert_np->np_accept_wq,
2707                         !isert_check_accept_queue(isert_np) ||
2708                         np->np_thread_state == ISCSI_NP_THREAD_RESET);
2709         if (max_accept > 5)
2710                 return -ENODEV;
2711
2712         spin_lock_bh(&np->np_thread_lock);
2713         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2714                 spin_unlock_bh(&np->np_thread_lock);
2715                 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2716                 return -ENODEV;
2717         }
2718         spin_unlock_bh(&np->np_thread_lock);
2719
2720         mutex_lock(&isert_np->np_accept_mutex);
2721         if (list_empty(&isert_np->np_accept_list)) {
2722                 mutex_unlock(&isert_np->np_accept_mutex);
2723                 max_accept++;
2724                 goto accept_wait;
2725         }
2726         isert_conn = list_first_entry(&isert_np->np_accept_list,
2727                         struct isert_conn, conn_accept_node);
2728         list_del_init(&isert_conn->conn_accept_node);
2729         mutex_unlock(&isert_np->np_accept_mutex);
2730
2731         conn->context = isert_conn;
2732         isert_conn->conn = conn;
2733         max_accept = 0;
2734
2735         ret = isert_rdma_post_recvl(isert_conn);
2736         if (ret)
2737                 return ret;
2738
2739         ret = isert_rdma_accept(isert_conn);
2740         if (ret)
2741                 return ret;
2742
2743         isert_set_conn_info(np, conn, isert_conn);
2744
2745         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2746         return 0;
2747 }
2748
2749 static void
2750 isert_free_np(struct iscsi_np *np)
2751 {
2752         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2753
2754         rdma_destroy_id(isert_np->np_cm_id);
2755
2756         np->np_context = NULL;
2757         kfree(isert_np);
2758 }
2759
2760 static void isert_wait_conn(struct iscsi_conn *conn)
2761 {
2762         struct isert_conn *isert_conn = conn->context;
2763
2764         pr_debug("isert_wait_conn: Starting \n");
2765         /*
2766          * Decrement post_send_buf_count for special case when called
2767          * from isert_do_control_comp() -> iscsit_logout_post_handler()
2768          */
2769         mutex_lock(&isert_conn->conn_mutex);
2770         if (isert_conn->logout_posted)
2771                 atomic_dec(&isert_conn->post_send_buf_count);
2772
2773         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
2774                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
2775                 rdma_disconnect(isert_conn->conn_cm_id);
2776         }
2777         /*
2778          * Only wait for conn_wait_comp_err if the isert_conn made it
2779          * into full feature phase..
2780          */
2781         if (isert_conn->state == ISER_CONN_INIT) {
2782                 mutex_unlock(&isert_conn->conn_mutex);
2783                 return;
2784         }
2785         if (isert_conn->state == ISER_CONN_UP)
2786                 isert_conn->state = ISER_CONN_TERMINATING;
2787         mutex_unlock(&isert_conn->conn_mutex);
2788
2789         wait_for_completion(&isert_conn->conn_wait_comp_err);
2790
2791         wait_for_completion(&isert_conn->conn_wait);
2792 }
2793
2794 static void isert_free_conn(struct iscsi_conn *conn)
2795 {
2796         struct isert_conn *isert_conn = conn->context;
2797
2798         isert_put_conn(isert_conn);
2799 }
2800
2801 static struct iscsit_transport iser_target_transport = {
2802         .name                   = "IB/iSER",
2803         .transport_type         = ISCSI_INFINIBAND,
2804         .priv_size              = sizeof(struct isert_cmd),
2805         .owner                  = THIS_MODULE,
2806         .iscsit_setup_np        = isert_setup_np,
2807         .iscsit_accept_np       = isert_accept_np,
2808         .iscsit_free_np         = isert_free_np,
2809         .iscsit_wait_conn       = isert_wait_conn,
2810         .iscsit_free_conn       = isert_free_conn,
2811         .iscsit_get_login_rx    = isert_get_login_rx,
2812         .iscsit_put_login_tx    = isert_put_login_tx,
2813         .iscsit_immediate_queue = isert_immediate_queue,
2814         .iscsit_response_queue  = isert_response_queue,
2815         .iscsit_get_dataout     = isert_get_dataout,
2816         .iscsit_queue_data_in   = isert_put_datain,
2817         .iscsit_queue_status    = isert_put_response,
2818 };
2819
2820 static int __init isert_init(void)
2821 {
2822         int ret;
2823
2824         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2825         if (!isert_rx_wq) {
2826                 pr_err("Unable to allocate isert_rx_wq\n");
2827                 return -ENOMEM;
2828         }
2829
2830         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2831         if (!isert_comp_wq) {
2832                 pr_err("Unable to allocate isert_comp_wq\n");
2833                 ret = -ENOMEM;
2834                 goto destroy_rx_wq;
2835         }
2836
2837         iscsit_register_transport(&iser_target_transport);
2838         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2839         return 0;
2840
2841 destroy_rx_wq:
2842         destroy_workqueue(isert_rx_wq);
2843         return ret;
2844 }
2845
2846 static void __exit isert_exit(void)
2847 {
2848         destroy_workqueue(isert_comp_wq);
2849         destroy_workqueue(isert_rx_wq);
2850         iscsit_unregister_transport(&iser_target_transport);
2851         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2852 }
2853
2854 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2855 MODULE_VERSION("0.1");
2856 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2857 MODULE_LICENSE("GPL");
2858
2859 module_init(isert_init);
2860 module_exit(isert_exit);