drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55
  56 static void
  57 isert_qp_event_callback(struct ib_event *e, void *context)
  58 {
  59         struct isert_conn *isert_conn = (struct isert_conn *)context;
  60
  61         pr_err("isert_qp_event_callback event: %d\n", e->event);
  62         switch (e->event) {
  63         case IB_EVENT_COMM_EST:
  64                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  65                 break;
  66         case IB_EVENT_QP_LAST_WQE_REACHED:
  67                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  68                 break;
  69         default:
  70                 break;
  71         }
  72 }
  73
  74 static int
  75 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  76 {
  77         int ret;
  78
  79         ret = ib_query_device(ib_dev, devattr);
  80         if (ret) {
  81                 pr_err("ib_query_device() failed: %d\n", ret);
  82                 return ret;
  83         }
  84         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  85         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  86
  87         return 0;
  88 }
  89
  90 static int
  91 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
  92 {
  93         struct isert_device *device = isert_conn->conn_device;
  94         struct ib_qp_init_attr attr;
  95         int ret, index, min_index = 0;
  96
  97         mutex_lock(&device_list_mutex);
  98         for (index = 0; index < device->cqs_used; index++)
  99                 if (device->cq_active_qps[index] <
 100                     device->cq_active_qps[min_index])
 101                         min_index = index;
 102         device->cq_active_qps[min_index]++;
 103         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 104         mutex_unlock(&device_list_mutex);
 105
 106         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 107         attr.event_handler = isert_qp_event_callback;
 108         attr.qp_context = isert_conn;
 109         attr.send_cq = device->dev_tx_cq[min_index];
 110         attr.recv_cq = device->dev_rx_cq[min_index];
 111         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 112         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 113         /*
 114          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 115          * work-around for RDMA_READs with ConnectX-2.
 116          *
 117          * Also, still make sure to have at least two SGEs for
 118          * outgoing control PDU responses.
 119          */
 120         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 121         isert_conn->max_sge = attr.cap.max_send_sge;
 122
 123         attr.cap.max_recv_sge = 1;
 124         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 125         attr.qp_type = IB_QPT_RC;
 126
 127         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 128                  cma_id->device);
 129         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 130                  isert_conn->conn_pd->device);
 131
 132         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 133         if (ret) {
 134                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 135                 return ret;
 136         }
 137         isert_conn->conn_qp = cma_id->qp;
 138         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 139
 140         return 0;
 141 }
 142
 143 static void
 144 isert_cq_event_callback(struct ib_event *e, void *context)
 145 {
 146         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 147 }
 148
 149 static int
 150 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 151 {
 152         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 153         struct iser_rx_desc *rx_desc;
 154         struct ib_sge *rx_sg;
 155         u64 dma_addr;
 156         int i, j;
 157
 158         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 159                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 160         if (!isert_conn->conn_rx_descs)
 161                 goto fail;
 162
 163         rx_desc = isert_conn->conn_rx_descs;
 164
 165         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 166                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 167                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 168                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 169                         goto dma_map_fail;
 170
 171                 rx_desc->dma_addr = dma_addr;
 172
 173                 rx_sg = &rx_desc->rx_sg;
 174                 rx_sg->addr = rx_desc->dma_addr;
 175                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 176                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 177         }
 178
 179         isert_conn->conn_rx_desc_head = 0;
 180         return 0;
 181
 182 dma_map_fail:
 183         rx_desc = isert_conn->conn_rx_descs;
 184         for (j = 0; j < i; j++, rx_desc++) {
 185                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 186                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 187         }
 188         kfree(isert_conn->conn_rx_descs);
 189         isert_conn->conn_rx_descs = NULL;
 190 fail:
 191         return -ENOMEM;
 192 }
 193
 194 static void
 195 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 196 {
 197         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 198         struct iser_rx_desc *rx_desc;
 199         int i;
 200
 201         if (!isert_conn->conn_rx_descs)
 202                 return;
 203
 204         rx_desc = isert_conn->conn_rx_descs;
 205         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 206                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 207                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 208         }
 209
 210         kfree(isert_conn->conn_rx_descs);
 211         isert_conn->conn_rx_descs = NULL;
 212 }
 213
 214 static void isert_cq_tx_work(struct work_struct *);
 215 static void isert_cq_tx_callback(struct ib_cq *, void *);
 216 static void isert_cq_rx_work(struct work_struct *);
 217 static void isert_cq_rx_callback(struct ib_cq *, void *);
 218
 219 static int
 220 isert_create_device_ib_res(struct isert_device *device)
 221 {
 222         struct ib_device *ib_dev = device->ib_device;
 223         struct isert_cq_desc *cq_desc;
 224         struct ib_device_attr *dev_attr;
 225         int ret = 0, i, j;
 226         int max_rx_cqe, max_tx_cqe;
 227
 228         dev_attr = &device->dev_attr;
 229         ret = isert_query_device(ib_dev, dev_attr);
 230         if (ret)
 231                 return ret;
 232
 233         max_rx_cqe = min(ISER_MAX_RX_CQ_LEN, dev_attr->max_cqe);
 234         max_tx_cqe = min(ISER_MAX_TX_CQ_LEN, dev_attr->max_cqe);
 235
 236         /* asign function handlers */
 237         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
 238                 device->use_fastreg = 1;
 239                 device->reg_rdma_mem = isert_reg_rdma;
 240                 device->unreg_rdma_mem = isert_unreg_rdma;
 241         } else {
 242                 device->use_fastreg = 0;
 243                 device->reg_rdma_mem = isert_map_rdma;
 244                 device->unreg_rdma_mem = isert_unmap_cmd;
 245         }
 246
 247         device->cqs_used = min_t(int, num_online_cpus(),
 248                                  device->ib_device->num_comp_vectors);
 249         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 250         pr_debug("Using %d CQs, device %s supports %d vectors support "
 251                  "Fast registration %d\n",
 252                  device->cqs_used, device->ib_device->name,
 253                  device->ib_device->num_comp_vectors, device->use_fastreg);
 254         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 255                                 device->cqs_used, GFP_KERNEL);
 256         if (!device->cq_desc) {
 257                 pr_err("Unable to allocate device->cq_desc\n");
 258                 return -ENOMEM;
 259         }
 260         cq_desc = device->cq_desc;
 261
 262         for (i = 0; i < device->cqs_used; i++) {
 263                 cq_desc[i].device = device;
 264                 cq_desc[i].cq_index = i;
 265
 266                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 267                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 268                                                 isert_cq_rx_callback,
 269                                                 isert_cq_event_callback,
 270                                                 (void *)&cq_desc[i],
 271                                                 max_rx_cqe, i);
 272                 if (IS_ERR(device->dev_rx_cq[i])) {
 273                         ret = PTR_ERR(device->dev_rx_cq[i]);
 274                         device->dev_rx_cq[i] = NULL;
 275                         goto out_cq;
 276                 }
 277
 278                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 279                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 280                                                 isert_cq_tx_callback,
 281                                                 isert_cq_event_callback,
 282                                                 (void *)&cq_desc[i],
 283                                                 max_tx_cqe, i);
 284                 if (IS_ERR(device->dev_tx_cq[i])) {
 285                         ret = PTR_ERR(device->dev_tx_cq[i]);
 286                         device->dev_tx_cq[i] = NULL;
 287                         goto out_cq;
 288                 }
 289
 290                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 291                 if (ret)
 292                         goto out_cq;
 293
 294                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 295                 if (ret)
 296                         goto out_cq;
 297         }
 298
 299         return 0;
 300
 301 out_cq:
 302         for (j = 0; j < i; j++) {
 303                 cq_desc = &device->cq_desc[j];
 304
 305                 if (device->dev_rx_cq[j]) {
 306                         cancel_work_sync(&cq_desc->cq_rx_work);
 307                         ib_destroy_cq(device->dev_rx_cq[j]);
 308                 }
 309                 if (device->dev_tx_cq[j]) {
 310                         cancel_work_sync(&cq_desc->cq_tx_work);
 311                         ib_destroy_cq(device->dev_tx_cq[j]);
 312                 }
 313         }
 314         kfree(device->cq_desc);
 315
 316         return ret;
 317 }
 318
 319 static void
 320 isert_free_device_ib_res(struct isert_device *device)
 321 {
 322         struct isert_cq_desc *cq_desc;
 323         int i;
 324
 325         for (i = 0; i < device->cqs_used; i++) {
 326                 cq_desc = &device->cq_desc[i];
 327
 328                 cancel_work_sync(&cq_desc->cq_rx_work);
 329                 cancel_work_sync(&cq_desc->cq_tx_work);
 330                 ib_destroy_cq(device->dev_rx_cq[i]);
 331                 ib_destroy_cq(device->dev_tx_cq[i]);
 332                 device->dev_rx_cq[i] = NULL;
 333                 device->dev_tx_cq[i] = NULL;
 334         }
 335
 336         kfree(device->cq_desc);
 337 }
 338
 339 static void
 340 isert_device_try_release(struct isert_device *device)
 341 {
 342         mutex_lock(&device_list_mutex);
 343         device->refcount--;
 344         if (!device->refcount) {
 345                 isert_free_device_ib_res(device);
 346                 list_del(&device->dev_node);
 347                 kfree(device);
 348         }
 349         mutex_unlock(&device_list_mutex);
 350 }
 351
 352 static struct isert_device *
 353 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 354 {
 355         struct isert_device *device;
 356         int ret;
 357
 358         mutex_lock(&device_list_mutex);
 359         list_for_each_entry(device, &device_list, dev_node) {
 360                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 361                         device->refcount++;
 362                         mutex_unlock(&device_list_mutex);
 363                         return device;
 364                 }
 365         }
 366
 367         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 368         if (!device) {
 369                 mutex_unlock(&device_list_mutex);
 370                 return ERR_PTR(-ENOMEM);
 371         }
 372
 373         INIT_LIST_HEAD(&device->dev_node);
 374
 375         device->ib_device = cma_id->device;
 376         ret = isert_create_device_ib_res(device);
 377         if (ret) {
 378                 kfree(device);
 379                 mutex_unlock(&device_list_mutex);
 380                 return ERR_PTR(ret);
 381         }
 382
 383         device->refcount++;
 384         list_add_tail(&device->dev_node, &device_list);
 385         mutex_unlock(&device_list_mutex);
 386
 387         return device;
 388 }
 389
 390 static void
 391 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 392 {
 393         struct fast_reg_descriptor *fr_desc, *tmp;
 394         int i = 0;
 395
 396         if (list_empty(&isert_conn->conn_fr_pool))
 397                 return;
 398
 399         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 400
 401         list_for_each_entry_safe(fr_desc, tmp,
 402                                  &isert_conn->conn_fr_pool, list) {
 403                 list_del(&fr_desc->list);
 404                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 405                 ib_dereg_mr(fr_desc->data_mr);
 406                 kfree(fr_desc);
 407                 ++i;
 408         }
 409
 410         if (i < isert_conn->conn_fr_pool_size)
 411                 pr_warn("Pool still has %d regions registered\n",
 412                         isert_conn->conn_fr_pool_size - i);
 413 }
 414
 415 static int
 416 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 417                      struct fast_reg_descriptor *fr_desc)
 418 {
 419         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 420                                                          ISCSI_ISER_SG_TABLESIZE);
 421         if (IS_ERR(fr_desc->data_frpl)) {
 422                 pr_err("Failed to allocate data frpl err=%ld\n",
 423                        PTR_ERR(fr_desc->data_frpl));
 424                 return PTR_ERR(fr_desc->data_frpl);
 425         }
 426
 427         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 428         if (IS_ERR(fr_desc->data_mr)) {
 429                 pr_err("Failed to allocate data frmr err=%ld\n",
 430                        PTR_ERR(fr_desc->data_mr));
 431                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 432                 return PTR_ERR(fr_desc->data_mr);
 433         }
 434         pr_debug("Create fr_desc %p page_list %p\n",
 435                  fr_desc, fr_desc->data_frpl->page_list);
 436
 437         fr_desc->valid = true;
 438
 439         return 0;
 440 }
 441
 442 static int
 443 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 444 {
 445         struct fast_reg_descriptor *fr_desc;
 446         struct isert_device *device = isert_conn->conn_device;
 447         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 448         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 449         int i, ret, tag_num;
 450         /*
 451          * Setup the number of FRMRs based upon the number of tags
 452          * available to session in iscsi_target_locate_portal().
 453          */
 454         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 455         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 456
 457         isert_conn->conn_fr_pool_size = 0;
 458         for (i = 0; i < tag_num; i++) {
 459                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 460                 if (!fr_desc) {
 461                         pr_err("Failed to allocate fast_reg descriptor\n");
 462                         ret = -ENOMEM;
 463                         goto err;
 464                 }
 465
 466                 ret = isert_create_fr_desc(device->ib_device,
 467                                            isert_conn->conn_pd, fr_desc);
 468                 if (ret) {
 469                         pr_err("Failed to create fastreg descriptor err=%d\n",
 470                                ret);
 471                         kfree(fr_desc);
 472                         goto err;
 473                 }
 474
 475                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 476                 isert_conn->conn_fr_pool_size++;
 477         }
 478
 479         pr_debug("Creating conn %p fastreg pool size=%d",
 480                  isert_conn, isert_conn->conn_fr_pool_size);
 481
 482         return 0;
 483
 484 err:
 485         isert_conn_free_fastreg_pool(isert_conn);
 486         return ret;
 487 }
 488
 489 static int
 490 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 491 {
 492         struct iscsi_np *np = cma_id->context;
 493         struct isert_np *isert_np = np->np_context;
 494         struct isert_conn *isert_conn;
 495         struct isert_device *device;
 496         struct ib_device *ib_dev = cma_id->device;
 497         int ret = 0;
 498
 499         spin_lock_bh(&np->np_thread_lock);
 500         if (!np->enabled) {
 501                 spin_unlock_bh(&np->np_thread_lock);
 502                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 503                 return rdma_reject(cma_id, NULL, 0);
 504         }
 505         spin_unlock_bh(&np->np_thread_lock);
 506
 507         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 508                  cma_id, cma_id->context);
 509
 510         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 511         if (!isert_conn) {
 512                 pr_err("Unable to allocate isert_conn\n");
 513                 return -ENOMEM;
 514         }
 515         isert_conn->state = ISER_CONN_INIT;
 516         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 517         init_completion(&isert_conn->conn_login_comp);
 518         init_completion(&isert_conn->conn_wait);
 519         init_completion(&isert_conn->conn_wait_comp_err);
 520         kref_init(&isert_conn->conn_kref);
 521         mutex_init(&isert_conn->conn_mutex);
 522         spin_lock_init(&isert_conn->conn_lock);
 523         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 524
 525         cma_id->context = isert_conn;
 526         isert_conn->conn_cm_id = cma_id;
 527         isert_conn->responder_resources = event->param.conn.responder_resources;
 528         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 529         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 530                  isert_conn->responder_resources, isert_conn->initiator_depth);
 531
 532         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 533                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 534         if (!isert_conn->login_buf) {
 535                 pr_err("Unable to allocate isert_conn->login_buf\n");
 536                 ret = -ENOMEM;
 537                 goto out;
 538         }
 539
 540         isert_conn->login_req_buf = isert_conn->login_buf;
 541         isert_conn->login_rsp_buf = isert_conn->login_buf +
 542                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 543         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 544                  isert_conn->login_buf, isert_conn->login_req_buf,
 545                  isert_conn->login_rsp_buf);
 546
 547         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 548                                 (void *)isert_conn->login_req_buf,
 549                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 550
 551         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 552         if (ret) {
 553                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 554                        ret);
 555                 isert_conn->login_req_dma = 0;
 556                 goto out_login_buf;
 557         }
 558
 559         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 560                                         (void *)isert_conn->login_rsp_buf,
 561                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 562
 563         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 564         if (ret) {
 565                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 566                        ret);
 567                 isert_conn->login_rsp_dma = 0;
 568                 goto out_req_dma_map;
 569         }
 570
 571         device = isert_device_find_by_ib_dev(cma_id);
 572         if (IS_ERR(device)) {
 573                 ret = PTR_ERR(device);
 574                 goto out_rsp_dma_map;
 575         }
 576
 577         isert_conn->conn_device = device;
 578         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 579         if (IS_ERR(isert_conn->conn_pd)) {
 580                 ret = PTR_ERR(isert_conn->conn_pd);
 581                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 582                        isert_conn, ret);
 583                 goto out_pd;
 584         }
 585
 586         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 587                                            IB_ACCESS_LOCAL_WRITE);
 588         if (IS_ERR(isert_conn->conn_mr)) {
 589                 ret = PTR_ERR(isert_conn->conn_mr);
 590                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 591                        isert_conn, ret);
 592                 goto out_mr;
 593         }
 594
 595         ret = isert_conn_setup_qp(isert_conn, cma_id);
 596         if (ret)
 597                 goto out_conn_dev;
 598
 599         mutex_lock(&isert_np->np_accept_mutex);
 600         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 601         mutex_unlock(&isert_np->np_accept_mutex);
 602
 603         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 604         up(&isert_np->np_sem);
 605         return 0;
 606
 607 out_conn_dev:
 608         ib_dereg_mr(isert_conn->conn_mr);
 609 out_mr:
 610         ib_dealloc_pd(isert_conn->conn_pd);
 611 out_pd:
 612         isert_device_try_release(device);
 613 out_rsp_dma_map:
 614         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 615                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 616 out_req_dma_map:
 617         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 618                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 619 out_login_buf:
 620         kfree(isert_conn->login_buf);
 621 out:
 622         kfree(isert_conn);
 623         return ret;
 624 }
 625
 626 static void
 627 isert_connect_release(struct isert_conn *isert_conn)
 628 {
 629         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 630         struct isert_device *device = isert_conn->conn_device;
 631         int cq_index;
 632
 633         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 634
 635         if (device && device->use_fastreg)
 636                 isert_conn_free_fastreg_pool(isert_conn);
 637
 638         if (isert_conn->conn_qp) {
 639                 cq_index = ((struct isert_cq_desc *)
 640                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 641                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 642                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 643
 644                 rdma_destroy_qp(isert_conn->conn_cm_id);
 645         }
 646
 647         isert_free_rx_descriptors(isert_conn);
 648         rdma_destroy_id(isert_conn->conn_cm_id);
 649
 650         ib_dereg_mr(isert_conn->conn_mr);
 651         ib_dealloc_pd(isert_conn->conn_pd);
 652
 653         if (isert_conn->login_buf) {
 654                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 655                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 656                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 657                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 658                                     DMA_FROM_DEVICE);
 659                 kfree(isert_conn->login_buf);
 660         }
 661         kfree(isert_conn);
 662
 663         if (device)
 664                 isert_device_try_release(device);
 665
 666         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 667 }
 668
 669 static void
 670 isert_connected_handler(struct rdma_cm_id *cma_id)
 671 {
 672         struct isert_conn *isert_conn = cma_id->context;
 673
 674         kref_get(&isert_conn->conn_kref);
 675 }
 676
 677 static void
 678 isert_release_conn_kref(struct kref *kref)
 679 {
 680         struct isert_conn *isert_conn = container_of(kref,
 681                                 struct isert_conn, conn_kref);
 682
 683         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 684                  current->comm, current->pid);
 685
 686         isert_connect_release(isert_conn);
 687 }
 688
 689 static void
 690 isert_put_conn(struct isert_conn *isert_conn)
 691 {
 692         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 693 }
 694
 695 static void
 696 isert_disconnect_work(struct work_struct *work)
 697 {
 698         struct isert_conn *isert_conn = container_of(work,
 699                                 struct isert_conn, conn_logout_work);
 700
 701         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 702         mutex_lock(&isert_conn->conn_mutex);
 703         if (isert_conn->state == ISER_CONN_UP)
 704                 isert_conn->state = ISER_CONN_TERMINATING;
 705
 706         if (isert_conn->post_recv_buf_count == 0 &&
 707             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 708                 mutex_unlock(&isert_conn->conn_mutex);
 709                 goto wake_up;
 710         }
 711         if (!isert_conn->conn_cm_id) {
 712                 mutex_unlock(&isert_conn->conn_mutex);
 713                 isert_put_conn(isert_conn);
 714                 return;
 715         }
 716
 717         if (isert_conn->disconnect) {
 718                 /* Send DREQ/DREP towards our initiator */
 719                 rdma_disconnect(isert_conn->conn_cm_id);
 720         }
 721
 722         mutex_unlock(&isert_conn->conn_mutex);
 723
 724 wake_up:
 725         complete(&isert_conn->conn_wait);
 726 }
 727
 728 static int
 729 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
 730 {
 731         struct isert_conn *isert_conn;
 732
 733         if (!cma_id->qp) {
 734                 struct isert_np *isert_np = cma_id->context;
 735
 736                 isert_np->np_cm_id = NULL;
 737                 return -1;
 738         }
 739
 740         isert_conn = (struct isert_conn *)cma_id->context;
 741
 742         isert_conn->disconnect = disconnect;
 743         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 744         schedule_work(&isert_conn->conn_logout_work);
 745
 746         return 0;
 747 }
 748
 749 static int
 750 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 751 {
 752         int ret = 0;
 753         bool disconnect = false;
 754
 755         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 756                  event->event, event->status, cma_id->context, cma_id);
 757
 758         switch (event->event) {
 759         case RDMA_CM_EVENT_CONNECT_REQUEST:
 760                 ret = isert_connect_request(cma_id, event);
 761                 if (ret)
 762                         pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 763                                 event->event, ret);
 764                 break;
 765         case RDMA_CM_EVENT_ESTABLISHED:
 766                 isert_connected_handler(cma_id);
 767                 break;
 768         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 769         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 770         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 771                 disconnect = true;
 772         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 773                 ret = isert_disconnected_handler(cma_id, disconnect);
 774                 break;
 775         case RDMA_CM_EVENT_CONNECT_ERROR:
 776         default:
 777                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 778                 break;
 779         }
 780
 781         return ret;
 782 }
 783
 784 static int
 785 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 786 {
 787         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 788         int i, ret;
 789         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 790         struct iser_rx_desc *rx_desc;
 791
 792         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 793                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 794                 rx_wr->wr_id    = (unsigned long)rx_desc;
 795                 rx_wr->sg_list  = &rx_desc->rx_sg;
 796                 rx_wr->num_sge  = 1;
 797                 rx_wr->next     = rx_wr + 1;
 798                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 799         }
 800
 801         rx_wr--;
 802         rx_wr->next = NULL; /* mark end of work requests list */
 803
 804         isert_conn->post_recv_buf_count += count;
 805         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 806                                 &rx_wr_failed);
 807         if (ret) {
 808                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 809                 isert_conn->post_recv_buf_count -= count;
 810         } else {
 811                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 812                 isert_conn->conn_rx_desc_head = rx_head;
 813         }
 814         return ret;
 815 }
 816
 817 static int
 818 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 819 {
 820         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 821         struct ib_send_wr send_wr, *send_wr_failed;
 822         int ret;
 823
 824         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 825                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 826
 827         send_wr.next    = NULL;
 828         send_wr.wr_id   = (unsigned long)tx_desc;
 829         send_wr.sg_list = tx_desc->tx_sg;
 830         send_wr.num_sge = tx_desc->num_sge;
 831         send_wr.opcode  = IB_WR_SEND;
 832         send_wr.send_flags = IB_SEND_SIGNALED;
 833
 834         atomic_inc(&isert_conn->post_send_buf_count);
 835
 836         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 837         if (ret) {
 838                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 839                 atomic_dec(&isert_conn->post_send_buf_count);
 840         }
 841
 842         return ret;
 843 }
 844
 845 static void
 846 isert_create_send_desc(struct isert_conn *isert_conn,
 847                        struct isert_cmd *isert_cmd,
 848                        struct iser_tx_desc *tx_desc)
 849 {
 850         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 851
 852         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 853                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 854
 855         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 856         tx_desc->iser_header.flags = ISER_VER;
 857
 858         tx_desc->num_sge = 1;
 859         tx_desc->isert_cmd = isert_cmd;
 860
 861         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 862                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 863                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 864         }
 865 }
 866
 867 static int
 868 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 869                    struct iser_tx_desc *tx_desc)
 870 {
 871         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 872         u64 dma_addr;
 873
 874         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 875                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 876         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 877                 pr_err("ib_dma_mapping_error() failed\n");
 878                 return -ENOMEM;
 879         }
 880
 881         tx_desc->dma_addr = dma_addr;
 882         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 883         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 884         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 885
 886         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 887                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 888                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 889
 890         return 0;
 891 }
 892
 893 static void
 894 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 895                    struct ib_send_wr *send_wr, bool coalesce)
 896 {
 897         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 898
 899         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 900         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 901         send_wr->opcode = IB_WR_SEND;
 902         send_wr->sg_list = &tx_desc->tx_sg[0];
 903         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 904         /*
 905          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 906          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 907          */
 908         mutex_lock(&isert_conn->conn_mutex);
 909         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 910             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 911                 tx_desc->llnode_active = true;
 912                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 913                 mutex_unlock(&isert_conn->conn_mutex);
 914                 return;
 915         }
 916         isert_conn->conn_comp_batch = 0;
 917         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 918         mutex_unlock(&isert_conn->conn_mutex);
 919
 920         send_wr->send_flags = IB_SEND_SIGNALED;
 921 }
 922
 923 static int
 924 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 925 {
 926         struct ib_recv_wr rx_wr, *rx_wr_fail;
 927         struct ib_sge sge;
 928         int ret;
 929
 930         memset(&sge, 0, sizeof(struct ib_sge));
 931         sge.addr = isert_conn->login_req_dma;
 932         sge.length = ISER_RX_LOGIN_SIZE;
 933         sge.lkey = isert_conn->conn_mr->lkey;
 934
 935         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 936                 sge.addr, sge.length, sge.lkey);
 937
 938         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 939         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
 940         rx_wr.sg_list = &sge;
 941         rx_wr.num_sge = 1;
 942
 943         isert_conn->post_recv_buf_count++;
 944         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
 945         if (ret) {
 946                 pr_err("ib_post_recv() failed: %d\n", ret);
 947                 isert_conn->post_recv_buf_count--;
 948         }
 949
 950         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
 951         return ret;
 952 }
 953
 954 static int
 955 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
 956                    u32 length)
 957 {
 958         struct isert_conn *isert_conn = conn->context;
 959         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 960         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
 961         int ret;
 962
 963         isert_create_send_desc(isert_conn, NULL, tx_desc);
 964
 965         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
 966                sizeof(struct iscsi_hdr));
 967
 968         isert_init_tx_hdrs(isert_conn, tx_desc);
 969
 970         if (length > 0) {
 971                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
 972
 973                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
 974                                            length, DMA_TO_DEVICE);
 975
 976                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
 977
 978                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
 979                                               length, DMA_TO_DEVICE);
 980
 981                 tx_dsg->addr    = isert_conn->login_rsp_dma;
 982                 tx_dsg->length  = length;
 983                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
 984                 tx_desc->num_sge = 2;
 985         }
 986         if (!login->login_failed) {
 987                 if (login->login_complete) {
 988                         if (!conn->sess->sess_ops->SessionType &&
 989                             isert_conn->conn_device->use_fastreg) {
 990                                 ret = isert_conn_create_fastreg_pool(isert_conn);
 991                                 if (ret) {
 992                                         pr_err("Conn: %p failed to create"
 993                                                " fastreg pool\n", isert_conn);
 994                                         return ret;
 995                                 }
 996                         }
 997
 998                         ret = isert_alloc_rx_descriptors(isert_conn);
 999                         if (ret)
1000                                 return ret;
1001
1002                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1003                         if (ret)
1004                                 return ret;
1005
1006                         isert_conn->state = ISER_CONN_UP;
1007                         goto post_send;
1008                 }
1009
1010                 ret = isert_rdma_post_recvl(isert_conn);
1011                 if (ret)
1012                         return ret;
1013         }
1014 post_send:
1015         ret = isert_post_send(isert_conn, tx_desc);
1016         if (ret)
1017                 return ret;
1018
1019         return 0;
1020 }
1021
1022 static void
1023 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1024                    struct isert_conn *isert_conn)
1025 {
1026         struct iscsi_conn *conn = isert_conn->conn;
1027         struct iscsi_login *login = conn->conn_login;
1028         int size;
1029
1030         if (!login) {
1031                 pr_err("conn->conn_login is NULL\n");
1032                 dump_stack();
1033                 return;
1034         }
1035
1036         if (login->first_request) {
1037                 struct iscsi_login_req *login_req =
1038                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1039                 /*
1040                  * Setup the initial iscsi_login values from the leading
1041                  * login request PDU.
1042                  */
1043                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1044                 login->current_stage =
1045                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1046                          >> 2;
1047                 login->version_min      = login_req->min_version;
1048                 login->version_max      = login_req->max_version;
1049                 memcpy(login->isid, login_req->isid, 6);
1050                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1051                 login->init_task_tag    = login_req->itt;
1052                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1053                 login->cid              = be16_to_cpu(login_req->cid);
1054                 login->tsih             = be16_to_cpu(login_req->tsih);
1055         }
1056
1057         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1058
1059         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1060         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1061                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1062         memcpy(login->req_buf, &rx_desc->data[0], size);
1063
1064         if (login->first_request) {
1065                 complete(&isert_conn->conn_login_comp);
1066                 return;
1067         }
1068         schedule_delayed_work(&conn->login_work, 0);
1069 }
1070
1071 static struct iscsi_cmd
1072 *isert_allocate_cmd(struct iscsi_conn *conn)
1073 {
1074         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1075         struct isert_cmd *isert_cmd;
1076         struct iscsi_cmd *cmd;
1077
1078         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1079         if (!cmd) {
1080                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1081                 return NULL;
1082         }
1083         isert_cmd = iscsit_priv_cmd(cmd);
1084         isert_cmd->conn = isert_conn;
1085         isert_cmd->iscsi_cmd = cmd;
1086
1087         return cmd;
1088 }
1089
1090 static int
1091 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1092                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1093                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1094 {
1095         struct iscsi_conn *conn = isert_conn->conn;
1096         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1097         struct scatterlist *sg;
1098         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1099         bool dump_payload = false;
1100
1101         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1102         if (rc < 0)
1103                 return rc;
1104
1105         imm_data = cmd->immediate_data;
1106         imm_data_len = cmd->first_burst_len;
1107         unsol_data = cmd->unsolicited_data;
1108
1109         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1110         if (rc < 0) {
1111                 return 0;
1112         } else if (rc > 0) {
1113                 dump_payload = true;
1114                 goto sequence_cmd;
1115         }
1116
1117         if (!imm_data)
1118                 return 0;
1119
1120         sg = &cmd->se_cmd.t_data_sg[0];
1121         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1122
1123         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1124                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1125
1126         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1127
1128         cmd->write_data_done += imm_data_len;
1129
1130         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1131                 spin_lock_bh(&cmd->istate_lock);
1132                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1133                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1134                 spin_unlock_bh(&cmd->istate_lock);
1135         }
1136
1137 sequence_cmd:
1138         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1139
1140         if (!rc && dump_payload == false && unsol_data)
1141                 iscsit_set_unsoliticed_dataout(cmd);
1142         else if (dump_payload && imm_data)
1143                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1144
1145         return 0;
1146 }
1147
1148 static int
1149 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1150                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1151 {
1152         struct scatterlist *sg_start;
1153         struct iscsi_conn *conn = isert_conn->conn;
1154         struct iscsi_cmd *cmd = NULL;
1155         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1156         u32 unsol_data_len = ntoh24(hdr->dlength);
1157         int rc, sg_nents, sg_off, page_off;
1158
1159         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1160         if (rc < 0)
1161                 return rc;
1162         else if (!cmd)
1163                 return 0;
1164         /*
1165          * FIXME: Unexpected unsolicited_data out
1166          */
1167         if (!cmd->unsolicited_data) {
1168                 pr_err("Received unexpected solicited data payload\n");
1169                 dump_stack();
1170                 return -1;
1171         }
1172
1173         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1174                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1175
1176         sg_off = cmd->write_data_done / PAGE_SIZE;
1177         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1178         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1179         page_off = cmd->write_data_done % PAGE_SIZE;
1180         /*
1181          * FIXME: Non page-aligned unsolicited_data out
1182          */
1183         if (page_off) {
1184                 pr_err("Received unexpected non-page aligned data payload\n");
1185                 dump_stack();
1186                 return -1;
1187         }
1188         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1189                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1190
1191         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1192                             unsol_data_len);
1193
1194         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1195         if (rc < 0)
1196                 return rc;
1197
1198         return 0;
1199 }
1200
1201 static int
1202 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1203                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1204                      unsigned char *buf)
1205 {
1206         struct iscsi_conn *conn = isert_conn->conn;
1207         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1208         int rc;
1209
1210         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1211         if (rc < 0)
1212                 return rc;
1213         /*
1214          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1215          */
1216
1217         return iscsit_process_nop_out(conn, cmd, hdr);
1218 }
1219
1220 static int
1221 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1222                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1223                       struct iscsi_text *hdr)
1224 {
1225         struct iscsi_conn *conn = isert_conn->conn;
1226         u32 payload_length = ntoh24(hdr->dlength);
1227         int rc;
1228         unsigned char *text_in;
1229
1230         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1231         if (rc < 0)
1232                 return rc;
1233
1234         text_in = kzalloc(payload_length, GFP_KERNEL);
1235         if (!text_in) {
1236                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1237                        payload_length);
1238                 return -ENOMEM;
1239         }
1240         cmd->text_in_ptr = text_in;
1241
1242         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1243
1244         return iscsit_process_text_cmd(conn, cmd, hdr);
1245 }
1246
1247 static int
1248 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1249                 uint32_t read_stag, uint64_t read_va,
1250                 uint32_t write_stag, uint64_t write_va)
1251 {
1252         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1253         struct iscsi_conn *conn = isert_conn->conn;
1254         struct iscsi_session *sess = conn->sess;
1255         struct iscsi_cmd *cmd;
1256         struct isert_cmd *isert_cmd;
1257         int ret = -EINVAL;
1258         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1259
1260         if (sess->sess_ops->SessionType &&
1261            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1262                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1263                        " ignoring\n", opcode);
1264                 return 0;
1265         }
1266
1267         switch (opcode) {
1268         case ISCSI_OP_SCSI_CMD:
1269                 cmd = isert_allocate_cmd(conn);
1270                 if (!cmd)
1271                         break;
1272
1273                 isert_cmd = iscsit_priv_cmd(cmd);
1274                 isert_cmd->read_stag = read_stag;
1275                 isert_cmd->read_va = read_va;
1276                 isert_cmd->write_stag = write_stag;
1277                 isert_cmd->write_va = write_va;
1278
1279                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1280                                         rx_desc, (unsigned char *)hdr);
1281                 break;
1282         case ISCSI_OP_NOOP_OUT:
1283                 cmd = isert_allocate_cmd(conn);
1284                 if (!cmd)
1285                         break;
1286
1287                 isert_cmd = iscsit_priv_cmd(cmd);
1288                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1289                                            rx_desc, (unsigned char *)hdr);
1290                 break;
1291         case ISCSI_OP_SCSI_DATA_OUT:
1292                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1293                                                 (unsigned char *)hdr);
1294                 break;
1295         case ISCSI_OP_SCSI_TMFUNC:
1296                 cmd = isert_allocate_cmd(conn);
1297                 if (!cmd)
1298                         break;
1299
1300                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1301                                                 (unsigned char *)hdr);
1302                 break;
1303         case ISCSI_OP_LOGOUT:
1304                 cmd = isert_allocate_cmd(conn);
1305                 if (!cmd)
1306                         break;
1307
1308                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1309                 if (ret > 0)
1310                         wait_for_completion_timeout(&conn->conn_logout_comp,
1311                                                     SECONDS_FOR_LOGOUT_COMP *
1312                                                     HZ);
1313                 break;
1314         case ISCSI_OP_TEXT:
1315                 cmd = isert_allocate_cmd(conn);
1316                 if (!cmd)
1317                         break;
1318
1319                 isert_cmd = iscsit_priv_cmd(cmd);
1320                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1321                                             rx_desc, (struct iscsi_text *)hdr);
1322                 break;
1323         default:
1324                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1325                 dump_stack();
1326                 break;
1327         }
1328
1329         return ret;
1330 }
1331
1332 static void
1333 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1334 {
1335         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1336         uint64_t read_va = 0, write_va = 0;
1337         uint32_t read_stag = 0, write_stag = 0;
1338         int rc;
1339
1340         switch (iser_hdr->flags & 0xF0) {
1341         case ISCSI_CTRL:
1342                 if (iser_hdr->flags & ISER_RSV) {
1343                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1344                         read_va = be64_to_cpu(iser_hdr->read_va);
1345                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1346                                  read_stag, (unsigned long long)read_va);
1347                 }
1348                 if (iser_hdr->flags & ISER_WSV) {
1349                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1350                         write_va = be64_to_cpu(iser_hdr->write_va);
1351                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1352                                  write_stag, (unsigned long long)write_va);
1353                 }
1354
1355                 pr_debug("ISER ISCSI_CTRL PDU\n");
1356                 break;
1357         case ISER_HELLO:
1358                 pr_err("iSER Hello message\n");
1359                 break;
1360         default:
1361                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1362                 break;
1363         }
1364
1365         rc = isert_rx_opcode(isert_conn, rx_desc,
1366                              read_stag, read_va, write_stag, write_va);
1367 }
1368
1369 static void
1370 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1371                     unsigned long xfer_len)
1372 {
1373         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1374         struct iscsi_hdr *hdr;
1375         u64 rx_dma;
1376         int rx_buflen, outstanding;
1377
1378         if ((char *)desc == isert_conn->login_req_buf) {
1379                 rx_dma = isert_conn->login_req_dma;
1380                 rx_buflen = ISER_RX_LOGIN_SIZE;
1381                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1382                          rx_dma, rx_buflen);
1383         } else {
1384                 rx_dma = desc->dma_addr;
1385                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1386                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1387                          rx_dma, rx_buflen);
1388         }
1389
1390         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1391
1392         hdr = &desc->iscsi_header;
1393         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1394                  hdr->opcode, hdr->itt, hdr->flags,
1395                  (int)(xfer_len - ISER_HEADERS_LEN));
1396
1397         if ((char *)desc == isert_conn->login_req_buf)
1398                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1399                                    isert_conn);
1400         else
1401                 isert_rx_do_work(desc, isert_conn);
1402
1403         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1404                                       DMA_FROM_DEVICE);
1405
1406         isert_conn->post_recv_buf_count--;
1407         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1408                  isert_conn->post_recv_buf_count);
1409
1410         if ((char *)desc == isert_conn->login_req_buf)
1411                 return;
1412
1413         outstanding = isert_conn->post_recv_buf_count;
1414         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1415                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1416                                 ISERT_MIN_POSTED_RX);
1417                 err = isert_post_recv(isert_conn, count);
1418                 if (err) {
1419                         pr_err("isert_post_recv() count: %d failed, %d\n",
1420                                count, err);
1421                 }
1422         }
1423 }
1424
1425 static void
1426 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1427 {
1428         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1429         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1430
1431         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1432         if (wr->sge) {
1433                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1434                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1435                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1436                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1437                 wr->sge = NULL;
1438         }
1439
1440         if (wr->send_wr) {
1441                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1442                 kfree(wr->send_wr);
1443                 wr->send_wr = NULL;
1444         }
1445
1446         if (wr->ib_sge) {
1447                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1448                 kfree(wr->ib_sge);
1449                 wr->ib_sge = NULL;
1450         }
1451 }
1452
1453 static void
1454 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1455 {
1456         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1457         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1458         LIST_HEAD(unmap_list);
1459
1460         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1461
1462         if (wr->fr_desc) {
1463                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1464                          isert_cmd, wr->fr_desc);
1465                 spin_lock_bh(&isert_conn->conn_lock);
1466                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1467                 spin_unlock_bh(&isert_conn->conn_lock);
1468                 wr->fr_desc = NULL;
1469         }
1470
1471         if (wr->sge) {
1472                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1473                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1474                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1475                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1476                 wr->sge = NULL;
1477         }
1478
1479         wr->ib_sge = NULL;
1480         wr->send_wr = NULL;
1481 }
1482
1483 static void
1484 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1485 {
1486         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1487         struct isert_conn *isert_conn = isert_cmd->conn;
1488         struct iscsi_conn *conn = isert_conn->conn;
1489         struct isert_device *device = isert_conn->conn_device;
1490
1491         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1492
1493         switch (cmd->iscsi_opcode) {
1494         case ISCSI_OP_SCSI_CMD:
1495                 spin_lock_bh(&conn->cmd_lock);
1496                 if (!list_empty(&cmd->i_conn_node))
1497                         list_del_init(&cmd->i_conn_node);
1498                 spin_unlock_bh(&conn->cmd_lock);
1499
1500                 if (cmd->data_direction == DMA_TO_DEVICE) {
1501                         iscsit_stop_dataout_timer(cmd);
1502                         /*
1503                          * Check for special case during comp_err where
1504                          * WRITE_PENDING has been handed off from core,
1505                          * but requires an extra target_put_sess_cmd()
1506                          * before transport_generic_free_cmd() below.
1507                          */
1508                         if (comp_err &&
1509                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1510                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1511
1512                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1513                         }
1514                 }
1515
1516                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1517                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1518                 break;
1519         case ISCSI_OP_SCSI_TMFUNC:
1520                 spin_lock_bh(&conn->cmd_lock);
1521                 if (!list_empty(&cmd->i_conn_node))
1522                         list_del_init(&cmd->i_conn_node);
1523                 spin_unlock_bh(&conn->cmd_lock);
1524
1525                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1526                 break;
1527         case ISCSI_OP_REJECT:
1528         case ISCSI_OP_NOOP_OUT:
1529         case ISCSI_OP_TEXT:
1530                 spin_lock_bh(&conn->cmd_lock);
1531                 if (!list_empty(&cmd->i_conn_node))
1532                         list_del_init(&cmd->i_conn_node);
1533                 spin_unlock_bh(&conn->cmd_lock);
1534
1535                 /*
1536                  * Handle special case for REJECT when iscsi_add_reject*() has
1537                  * overwritten the original iscsi_opcode assignment, and the
1538                  * associated cmd->se_cmd needs to be released.
1539                  */
1540                 if (cmd->se_cmd.se_tfo != NULL) {
1541                         pr_debug("Calling transport_generic_free_cmd from"
1542                                  " isert_put_cmd for 0x%02x\n",
1543                                  cmd->iscsi_opcode);
1544                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1545                         break;
1546                 }
1547                 /*
1548                  * Fall-through
1549                  */
1550         default:
1551                 iscsit_release_cmd(cmd);
1552                 break;
1553         }
1554 }
1555
1556 static void
1557 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1558 {
1559         if (tx_desc->dma_addr != 0) {
1560                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1561                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1562                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1563                 tx_desc->dma_addr = 0;
1564         }
1565 }
1566
1567 static void
1568 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1569                      struct ib_device *ib_dev, bool comp_err)
1570 {
1571         if (isert_cmd->pdu_buf_dma != 0) {
1572                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1573                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1574                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1575                 isert_cmd->pdu_buf_dma = 0;
1576         }
1577
1578         isert_unmap_tx_desc(tx_desc, ib_dev);
1579         isert_put_cmd(isert_cmd, comp_err);
1580 }
1581
1582 static void
1583 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1584                            struct isert_cmd *isert_cmd)
1585 {
1586         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1587         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1588         struct se_cmd *se_cmd = &cmd->se_cmd;
1589         struct isert_conn *isert_conn = isert_cmd->conn;
1590         struct isert_device *device = isert_conn->conn_device;
1591
1592         iscsit_stop_dataout_timer(cmd);
1593         device->unreg_rdma_mem(isert_cmd, isert_conn);
1594         cmd->write_data_done = wr->cur_rdma_length;
1595         wr->send_wr_num = 0;
1596
1597         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1598         spin_lock_bh(&cmd->istate_lock);
1599         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1600         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1601         spin_unlock_bh(&cmd->istate_lock);
1602
1603         target_execute_cmd(se_cmd);
1604 }
1605
1606 static void
1607 isert_do_control_comp(struct work_struct *work)
1608 {
1609         struct isert_cmd *isert_cmd = container_of(work,
1610                         struct isert_cmd, comp_work);
1611         struct isert_conn *isert_conn = isert_cmd->conn;
1612         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1613         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1614
1615         switch (cmd->i_state) {
1616         case ISTATE_SEND_TASKMGTRSP:
1617                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1618
1619                 atomic_dec(&isert_conn->post_send_buf_count);
1620                 iscsit_tmr_post_handler(cmd, cmd->conn);
1621
1622                 cmd->i_state = ISTATE_SENT_STATUS;
1623                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1624                 break;
1625         case ISTATE_SEND_REJECT:
1626                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1627                 atomic_dec(&isert_conn->post_send_buf_count);
1628
1629                 cmd->i_state = ISTATE_SENT_STATUS;
1630                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1631                 break;
1632         case ISTATE_SEND_LOGOUTRSP:
1633                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1634
1635                 atomic_dec(&isert_conn->post_send_buf_count);
1636                 iscsit_logout_post_handler(cmd, cmd->conn);
1637                 break;
1638         case ISTATE_SEND_TEXTRSP:
1639                 atomic_dec(&isert_conn->post_send_buf_count);
1640                 cmd->i_state = ISTATE_SENT_STATUS;
1641                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1642                 break;
1643         default:
1644                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1645                 dump_stack();
1646                 break;
1647         }
1648 }
1649
1650 static void
1651 isert_response_completion(struct iser_tx_desc *tx_desc,
1652                           struct isert_cmd *isert_cmd,
1653                           struct isert_conn *isert_conn,
1654                           struct ib_device *ib_dev)
1655 {
1656         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1657         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1658
1659         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1660             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1661             cmd->i_state == ISTATE_SEND_REJECT ||
1662             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1663                 isert_unmap_tx_desc(tx_desc, ib_dev);
1664
1665                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1666                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1667                 return;
1668         }
1669         atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1670
1671         cmd->i_state = ISTATE_SENT_STATUS;
1672         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1673 }
1674
1675 static void
1676 __isert_send_completion(struct iser_tx_desc *tx_desc,
1677                         struct isert_conn *isert_conn)
1678 {
1679         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1680         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1681         struct isert_rdma_wr *wr;
1682
1683         if (!isert_cmd) {
1684                 atomic_dec(&isert_conn->post_send_buf_count);
1685                 isert_unmap_tx_desc(tx_desc, ib_dev);
1686                 return;
1687         }
1688         wr = &isert_cmd->rdma_wr;
1689
1690         switch (wr->iser_ib_op) {
1691         case ISER_IB_RECV:
1692                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1693                 dump_stack();
1694                 break;
1695         case ISER_IB_SEND:
1696                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1697                 isert_response_completion(tx_desc, isert_cmd,
1698                                           isert_conn, ib_dev);
1699                 break;
1700         case ISER_IB_RDMA_WRITE:
1701                 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1702                 dump_stack();
1703                 break;
1704         case ISER_IB_RDMA_READ:
1705                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1706
1707                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1708                 isert_completion_rdma_read(tx_desc, isert_cmd);
1709                 break;
1710         default:
1711                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1712                 dump_stack();
1713                 break;
1714         }
1715 }
1716
1717 static void
1718 isert_send_completion(struct iser_tx_desc *tx_desc,
1719                       struct isert_conn *isert_conn)
1720 {
1721         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1722         struct iser_tx_desc *t;
1723         /*
1724          * Drain coalesced completion llist starting from comp_llnode_batch
1725          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1726          */
1727         while (llnode) {
1728                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1729                 llnode = llist_next(llnode);
1730                 __isert_send_completion(t, isert_conn);
1731         }
1732         __isert_send_completion(tx_desc, isert_conn);
1733 }
1734
1735 static void
1736 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1737 {
1738         struct llist_node *llnode;
1739         struct isert_rdma_wr *wr;
1740         struct iser_tx_desc *t;
1741
1742         mutex_lock(&isert_conn->conn_mutex);
1743         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1744         isert_conn->conn_comp_batch = 0;
1745         mutex_unlock(&isert_conn->conn_mutex);
1746
1747         while (llnode) {
1748                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1749                 llnode = llist_next(llnode);
1750                 wr = &t->isert_cmd->rdma_wr;
1751
1752                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1753                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1754         }
1755 }
1756
1757 static void
1758 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1759 {
1760         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1761         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1762         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1763         struct isert_rdma_wr *wr;
1764         struct iser_tx_desc *t;
1765
1766         while (llnode) {
1767                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1768                 llnode = llist_next(llnode);
1769                 wr = &t->isert_cmd->rdma_wr;
1770
1771                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1772                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1773         }
1774         tx_desc->comp_llnode_batch = NULL;
1775
1776         if (!isert_cmd)
1777                 isert_unmap_tx_desc(tx_desc, ib_dev);
1778         else
1779                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1780 }
1781
1782 static void
1783 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1784 {
1785         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1786         struct iscsi_conn *conn = isert_conn->conn;
1787
1788         if (isert_conn->post_recv_buf_count)
1789                 return;
1790
1791         isert_cq_drain_comp_llist(isert_conn, ib_dev);
1792
1793         if (conn->sess) {
1794                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1795                 target_wait_for_sess_cmds(conn->sess->se_sess);
1796         }
1797
1798         while (atomic_read(&isert_conn->post_send_buf_count))
1799                 msleep(3000);
1800
1801         mutex_lock(&isert_conn->conn_mutex);
1802         isert_conn->state = ISER_CONN_DOWN;
1803         mutex_unlock(&isert_conn->conn_mutex);
1804
1805         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1806
1807         complete(&isert_conn->conn_wait_comp_err);
1808 }
1809
1810 static void
1811 isert_cq_tx_work(struct work_struct *work)
1812 {
1813         struct isert_cq_desc *cq_desc = container_of(work,
1814                                 struct isert_cq_desc, cq_tx_work);
1815         struct isert_device *device = cq_desc->device;
1816         int cq_index = cq_desc->cq_index;
1817         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1818         struct isert_conn *isert_conn;
1819         struct iser_tx_desc *tx_desc;
1820         struct ib_wc wc;
1821
1822         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1823                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1824                 isert_conn = wc.qp->qp_context;
1825
1826                 if (wc.status == IB_WC_SUCCESS) {
1827                         isert_send_completion(tx_desc, isert_conn);
1828                 } else {
1829                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1830                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
1831                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1832
1833                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
1834                                 if (tx_desc->llnode_active)
1835                                         continue;
1836
1837                                 atomic_dec(&isert_conn->post_send_buf_count);
1838                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
1839                         }
1840                 }
1841         }
1842
1843         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1844 }
1845
1846 static void
1847 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1848 {
1849         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1850
1851         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1852 }
1853
1854 static void
1855 isert_cq_rx_work(struct work_struct *work)
1856 {
1857         struct isert_cq_desc *cq_desc = container_of(work,
1858                         struct isert_cq_desc, cq_rx_work);
1859         struct isert_device *device = cq_desc->device;
1860         int cq_index = cq_desc->cq_index;
1861         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1862         struct isert_conn *isert_conn;
1863         struct iser_rx_desc *rx_desc;
1864         struct ib_wc wc;
1865         unsigned long xfer_len;
1866
1867         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1868                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1869                 isert_conn = wc.qp->qp_context;
1870
1871                 if (wc.status == IB_WC_SUCCESS) {
1872                         xfer_len = (unsigned long)wc.byte_len;
1873                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
1874                 } else {
1875                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1876                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
1877                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1878                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
1879                                          wc.vendor_err);
1880                         }
1881                         isert_conn->post_recv_buf_count--;
1882                         isert_cq_rx_comp_err(isert_conn);
1883                 }
1884         }
1885
1886         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1887 }
1888
1889 static void
1890 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1891 {
1892         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1893
1894         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1895 }
1896
1897 static int
1898 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1899 {
1900         struct ib_send_wr *wr_failed;
1901         int ret;
1902
1903         atomic_inc(&isert_conn->post_send_buf_count);
1904
1905         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1906                            &wr_failed);
1907         if (ret) {
1908                 pr_err("ib_post_send failed with %d\n", ret);
1909                 atomic_dec(&isert_conn->post_send_buf_count);
1910                 return ret;
1911         }
1912         return ret;
1913 }
1914
1915 static int
1916 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1917 {
1918         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1919         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1920         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1921         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1922                                 &isert_cmd->tx_desc.iscsi_header;
1923
1924         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1925         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1926         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1927         /*
1928          * Attach SENSE DATA payload to iSCSI Response PDU
1929          */
1930         if (cmd->se_cmd.sense_buffer &&
1931             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1932             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1933                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1934                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1935                 u32 padding, pdu_len;
1936
1937                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1938                                    cmd->sense_buffer);
1939                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1940
1941                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1942                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1943                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1944
1945                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1946                                 (void *)cmd->sense_buffer, pdu_len,
1947                                 DMA_TO_DEVICE);
1948
1949                 isert_cmd->pdu_buf_len = pdu_len;
1950                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1951                 tx_dsg->length  = pdu_len;
1952                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1953                 isert_cmd->tx_desc.num_sge = 2;
1954         }
1955
1956         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1957
1958         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1959
1960         return isert_post_response(isert_conn, isert_cmd);
1961 }
1962
1963 static int
1964 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1965                 bool nopout_response)
1966 {
1967         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1968         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1969         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1970
1971         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1972         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1973                                &isert_cmd->tx_desc.iscsi_header,
1974                                nopout_response);
1975         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1977
1978         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1979
1980         return isert_post_response(isert_conn, isert_cmd);
1981 }
1982
1983 static int
1984 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1985 {
1986         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1987         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1988         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1989
1990         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1991         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1992                                 &isert_cmd->tx_desc.iscsi_header);
1993         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1994         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1995
1996         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1997
1998         return isert_post_response(isert_conn, isert_cmd);
1999 }
2000
2001 static int
2002 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2003 {
2004         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2005         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2006         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2007
2008         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2009         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2010                                   &isert_cmd->tx_desc.iscsi_header);
2011         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2012         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2013
2014         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2015
2016         return isert_post_response(isert_conn, isert_cmd);
2017 }
2018
2019 static int
2020 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2021 {
2022         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2023         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2024         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2025         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2026         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2027         struct iscsi_reject *hdr =
2028                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2029
2030         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2031         iscsit_build_reject(cmd, conn, hdr);
2032         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2033
2034         hton24(hdr->dlength, ISCSI_HDR_LEN);
2035         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2036                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2037                         DMA_TO_DEVICE);
2038         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2039         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2040         tx_dsg->length  = ISCSI_HDR_LEN;
2041         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2042         isert_cmd->tx_desc.num_sge = 2;
2043
2044         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2045
2046         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2047
2048         return isert_post_response(isert_conn, isert_cmd);
2049 }
2050
2051 static int
2052 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2053 {
2054         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2055         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2056         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2057         struct iscsi_text_rsp *hdr =
2058                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2059         u32 txt_rsp_len;
2060         int rc;
2061
2062         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2063         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2064         if (rc < 0)
2065                 return rc;
2066
2067         txt_rsp_len = rc;
2068         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2069
2070         if (txt_rsp_len) {
2071                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2072                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2073                 void *txt_rsp_buf = cmd->buf_ptr;
2074
2075                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2076                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2077
2078                 isert_cmd->pdu_buf_len = txt_rsp_len;
2079                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2080                 tx_dsg->length  = txt_rsp_len;
2081                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2082                 isert_cmd->tx_desc.num_sge = 2;
2083         }
2084         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2085
2086         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2087
2088         return isert_post_response(isert_conn, isert_cmd);
2089 }
2090
2091 static int
2092 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2093                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2094                     u32 data_left, u32 offset)
2095 {
2096         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2097         struct scatterlist *sg_start, *tmp_sg;
2098         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2099         u32 sg_off, page_off;
2100         int i = 0, sg_nents;
2101
2102         sg_off = offset / PAGE_SIZE;
2103         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2104         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2105         page_off = offset % PAGE_SIZE;
2106
2107         send_wr->sg_list = ib_sge;
2108         send_wr->num_sge = sg_nents;
2109         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2110         /*
2111          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2112          */
2113         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2114                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2115                          (unsigned long long)tmp_sg->dma_address,
2116                          tmp_sg->length, page_off);
2117
2118                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2119                 ib_sge->length = min_t(u32, data_left,
2120                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2121                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2122
2123                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2124                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2125                 page_off = 0;
2126                 data_left -= ib_sge->length;
2127                 ib_sge++;
2128                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2129         }
2130
2131         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2132                  send_wr->sg_list, send_wr->num_sge);
2133
2134         return sg_nents;
2135 }
2136
2137 static int
2138 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2139                struct isert_rdma_wr *wr)
2140 {
2141         struct se_cmd *se_cmd = &cmd->se_cmd;
2142         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2143         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2144         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2145         struct ib_send_wr *send_wr;
2146         struct ib_sge *ib_sge;
2147         struct scatterlist *sg_start;
2148         u32 sg_off = 0, sg_nents;
2149         u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
2150         int ret = 0, count, i, ib_sge_cnt;
2151
2152         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2153                 data_left = se_cmd->data_length;
2154         } else {
2155                 sg_off = cmd->write_data_done / PAGE_SIZE;
2156                 data_left = se_cmd->data_length - cmd->write_data_done;
2157                 offset = cmd->write_data_done;
2158                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2159         }
2160
2161         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2162         sg_nents = se_cmd->t_data_nents - sg_off;
2163
2164         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2165                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2166                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2167         if (unlikely(!count)) {
2168                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2169                 return -EINVAL;
2170         }
2171         wr->sge = sg_start;
2172         wr->num_sge = sg_nents;
2173         wr->cur_rdma_length = data_left;
2174         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2175                  isert_cmd, count, sg_start, sg_nents, data_left);
2176
2177         ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2178         if (!ib_sge) {
2179                 pr_warn("Unable to allocate ib_sge\n");
2180                 ret = -ENOMEM;
2181                 goto unmap_sg;
2182         }
2183         wr->ib_sge = ib_sge;
2184
2185         wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2186         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2187                                 GFP_KERNEL);
2188         if (!wr->send_wr) {
2189                 pr_debug("Unable to allocate wr->send_wr\n");
2190                 ret = -ENOMEM;
2191                 goto unmap_sg;
2192         }
2193
2194         wr->isert_cmd = isert_cmd;
2195         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2196
2197         for (i = 0; i < wr->send_wr_num; i++) {
2198                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2199                 data_len = min(data_left, rdma_write_max);
2200
2201                 send_wr->send_flags = 0;
2202                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2203                         send_wr->opcode = IB_WR_RDMA_WRITE;
2204                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2205                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2206                         if (i + 1 == wr->send_wr_num)
2207                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2208                         else
2209                                 send_wr->next = &wr->send_wr[i + 1];
2210                 } else {
2211                         send_wr->opcode = IB_WR_RDMA_READ;
2212                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2213                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2214                         if (i + 1 == wr->send_wr_num)
2215                                 send_wr->send_flags = IB_SEND_SIGNALED;
2216                         else
2217                                 send_wr->next = &wr->send_wr[i + 1];
2218                 }
2219
2220                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2221                                         send_wr, data_len, offset);
2222                 ib_sge += ib_sge_cnt;
2223
2224                 offset += data_len;
2225                 va_offset += data_len;
2226                 data_left -= data_len;
2227         }
2228
2229         return 0;
2230 unmap_sg:
2231         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2232                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2233                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2234         return ret;
2235 }
2236
2237 static int
2238 isert_map_fr_pagelist(struct ib_device *ib_dev,
2239                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2240 {
2241         u64 start_addr, end_addr, page, chunk_start = 0;
2242         struct scatterlist *tmp_sg;
2243         int i = 0, new_chunk, last_ent, n_pages;
2244
2245         n_pages = 0;
2246         new_chunk = 1;
2247         last_ent = sg_nents - 1;
2248         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2249                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2250                 if (new_chunk)
2251                         chunk_start = start_addr;
2252                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2253
2254                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2255                          i, (unsigned long long)tmp_sg->dma_address,
2256                          tmp_sg->length);
2257
2258                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2259                         new_chunk = 0;
2260                         continue;
2261                 }
2262                 new_chunk = 1;
2263
2264                 page = chunk_start & PAGE_MASK;
2265                 do {
2266                         fr_pl[n_pages++] = page;
2267                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2268                                  n_pages - 1, page);
2269                         page += PAGE_SIZE;
2270                 } while (page < end_addr);
2271         }
2272
2273         return n_pages;
2274 }
2275
2276 static int
2277 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
2278                   struct isert_conn *isert_conn, struct scatterlist *sg_start,
2279                   struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
2280                   unsigned int data_len)
2281 {
2282         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2283         struct ib_send_wr fr_wr, inv_wr;
2284         struct ib_send_wr *bad_wr, *wr = NULL;
2285         int ret, pagelist_len;
2286         u32 page_off;
2287         u8 key;
2288
2289         sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
2290         page_off = offset % PAGE_SIZE;
2291
2292         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2293                  fr_desc, sg_nents, offset);
2294
2295         pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2296                                              &fr_desc->data_frpl->page_list[0]);
2297
2298         if (!fr_desc->valid) {
2299                 memset(&inv_wr, 0, sizeof(inv_wr));
2300                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2301                 inv_wr.opcode = IB_WR_LOCAL_INV;
2302                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2303                 wr = &inv_wr;
2304                 /* Bump the key */
2305                 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2306                 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2307         }
2308
2309         /* Prepare FASTREG WR */
2310         memset(&fr_wr, 0, sizeof(fr_wr));
2311         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2312         fr_wr.opcode = IB_WR_FAST_REG_MR;
2313         fr_wr.wr.fast_reg.iova_start =
2314                 fr_desc->data_frpl->page_list[0] + page_off;
2315         fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2316         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2317         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2318         fr_wr.wr.fast_reg.length = data_len;
2319         fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2320         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2321
2322         if (!wr)
2323                 wr = &fr_wr;
2324         else
2325                 wr->next = &fr_wr;
2326
2327         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2328         if (ret) {
2329                 pr_err("fast registration failed, ret:%d\n", ret);
2330                 return ret;
2331         }
2332         fr_desc->valid = false;
2333
2334         ib_sge->lkey = fr_desc->data_mr->lkey;
2335         ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2336         ib_sge->length = data_len;
2337
2338         pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2339                  ib_sge->addr, ib_sge->length, ib_sge->lkey);
2340
2341         return ret;
2342 }
2343
2344 static int
2345 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2346                struct isert_rdma_wr *wr)
2347 {
2348         struct se_cmd *se_cmd = &cmd->se_cmd;
2349         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2350         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2351         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2352         struct ib_send_wr *send_wr;
2353         struct ib_sge *ib_sge;
2354         struct scatterlist *sg_start;
2355         struct fast_reg_descriptor *fr_desc;
2356         u32 sg_off = 0, sg_nents;
2357         u32 offset = 0, data_len, data_left, rdma_write_max;
2358         int ret = 0, count;
2359         unsigned long flags;
2360
2361         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2362                 data_left = se_cmd->data_length;
2363         } else {
2364                 offset = cmd->write_data_done;
2365                 sg_off = offset / PAGE_SIZE;
2366                 data_left = se_cmd->data_length - cmd->write_data_done;
2367                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2368         }
2369
2370         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2371         sg_nents = se_cmd->t_data_nents - sg_off;
2372
2373         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2374                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2375                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2376         if (unlikely(!count)) {
2377                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2378                 return -EINVAL;
2379         }
2380         wr->sge = sg_start;
2381         wr->num_sge = sg_nents;
2382         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2383                  isert_cmd, count, sg_start, sg_nents, data_left);
2384
2385         memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2386         ib_sge = &wr->s_ib_sge;
2387         wr->ib_sge = ib_sge;
2388
2389         wr->send_wr_num = 1;
2390         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2391         wr->send_wr = &wr->s_send_wr;
2392
2393         wr->isert_cmd = isert_cmd;
2394         rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2395
2396         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2397         send_wr->sg_list = ib_sge;
2398         send_wr->num_sge = 1;
2399         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2400         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2401                 send_wr->opcode = IB_WR_RDMA_WRITE;
2402                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2403                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2404                 send_wr->send_flags = 0;
2405                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2406         } else {
2407                 send_wr->opcode = IB_WR_RDMA_READ;
2408                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2409                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2410                 send_wr->send_flags = IB_SEND_SIGNALED;
2411         }
2412
2413         data_len = min(data_left, rdma_write_max);
2414         wr->cur_rdma_length = data_len;
2415
2416         /* if there is a single dma entry, dma mr is sufficient */
2417         if (count == 1) {
2418                 ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
2419                 ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
2420                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2421                 wr->fr_desc = NULL;
2422         } else {
2423                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2424                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2425                                            struct fast_reg_descriptor, list);
2426                 list_del(&fr_desc->list);
2427                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2428                 wr->fr_desc = fr_desc;
2429
2430                 ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
2431                                         ib_sge, sg_nents, offset, data_len);
2432                 if (ret) {
2433                         list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2434                         goto unmap_sg;
2435                 }
2436         }
2437
2438         return 0;
2439
2440 unmap_sg:
2441         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2442                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2443                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2444         return ret;
2445 }
2446
2447 static int
2448 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2449 {
2450         struct se_cmd *se_cmd = &cmd->se_cmd;
2451         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2452         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2453         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2454         struct isert_device *device = isert_conn->conn_device;
2455         struct ib_send_wr *wr_failed;
2456         int rc;
2457
2458         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2459                  isert_cmd, se_cmd->data_length);
2460         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2461         rc = device->reg_rdma_mem(conn, cmd, wr);
2462         if (rc) {
2463                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2464                 return rc;
2465         }
2466
2467         /*
2468          * Build isert_conn->tx_desc for iSCSI response PDU and attach
2469          */
2470         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2471         iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2472                              &isert_cmd->tx_desc.iscsi_header);
2473         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2474         isert_init_send_wr(isert_conn, isert_cmd,
2475                            &isert_cmd->tx_desc.send_wr, false);
2476
2477         atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2478
2479         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2480         if (rc) {
2481                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2482                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2483         }
2484         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2485                  isert_cmd);
2486
2487         return 1;
2488 }
2489
2490 static int
2491 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2492 {
2493         struct se_cmd *se_cmd = &cmd->se_cmd;
2494         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2495         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2496         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2497         struct isert_device *device = isert_conn->conn_device;
2498         struct ib_send_wr *wr_failed;
2499         int rc;
2500
2501         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2502                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2503         wr->iser_ib_op = ISER_IB_RDMA_READ;
2504         rc = device->reg_rdma_mem(conn, cmd, wr);
2505         if (rc) {
2506                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2507                 return rc;
2508         }
2509
2510         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2511
2512         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2513         if (rc) {
2514                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2515                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2516         }
2517         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2518                  isert_cmd);
2519
2520         return 0;
2521 }
2522
2523 static int
2524 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2525 {
2526         int ret;
2527
2528         switch (state) {
2529         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2530                 ret = isert_put_nopin(cmd, conn, false);
2531                 break;
2532         default:
2533                 pr_err("Unknown immediate state: 0x%02x\n", state);
2534                 ret = -EINVAL;
2535                 break;
2536         }
2537
2538         return ret;
2539 }
2540
2541 static int
2542 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2543 {
2544         int ret;
2545
2546         switch (state) {
2547         case ISTATE_SEND_LOGOUTRSP:
2548                 ret = isert_put_logout_rsp(cmd, conn);
2549                 if (!ret) {
2550                         pr_debug("Returning iSER Logout -EAGAIN\n");
2551                         ret = -EAGAIN;
2552                 }
2553                 break;
2554         case ISTATE_SEND_NOPIN:
2555                 ret = isert_put_nopin(cmd, conn, true);
2556                 break;
2557         case ISTATE_SEND_TASKMGTRSP:
2558                 ret = isert_put_tm_rsp(cmd, conn);
2559                 break;
2560         case ISTATE_SEND_REJECT:
2561                 ret = isert_put_reject(cmd, conn);
2562                 break;
2563         case ISTATE_SEND_TEXTRSP:
2564                 ret = isert_put_text_rsp(cmd, conn);
2565                 break;
2566         case ISTATE_SEND_STATUS:
2567                 /*
2568                  * Special case for sending non GOOD SCSI status from TX thread
2569                  * context during pre se_cmd excecution failure.
2570                  */
2571                 ret = isert_put_response(conn, cmd);
2572                 break;
2573         default:
2574                 pr_err("Unknown response state: 0x%02x\n", state);
2575                 ret = -EINVAL;
2576                 break;
2577         }
2578
2579         return ret;
2580 }
2581
2582 static int
2583 isert_setup_np(struct iscsi_np *np,
2584                struct __kernel_sockaddr_storage *ksockaddr)
2585 {
2586         struct isert_np *isert_np;
2587         struct rdma_cm_id *isert_lid;
2588         struct sockaddr *sa;
2589         int ret;
2590
2591         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2592         if (!isert_np) {
2593                 pr_err("Unable to allocate struct isert_np\n");
2594                 return -ENOMEM;
2595         }
2596         sema_init(&isert_np->np_sem, 0);
2597         mutex_init(&isert_np->np_accept_mutex);
2598         INIT_LIST_HEAD(&isert_np->np_accept_list);
2599         init_completion(&isert_np->np_login_comp);
2600
2601         sa = (struct sockaddr *)ksockaddr;
2602         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2603         /*
2604          * Setup the np->np_sockaddr from the passed sockaddr setup
2605          * in iscsi_target_configfs.c code..
2606          */
2607         memcpy(&np->np_sockaddr, ksockaddr,
2608                sizeof(struct __kernel_sockaddr_storage));
2609
2610         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2611                                 IB_QPT_RC);
2612         if (IS_ERR(isert_lid)) {
2613                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2614                        PTR_ERR(isert_lid));
2615                 ret = PTR_ERR(isert_lid);
2616                 goto out;
2617         }
2618
2619         ret = rdma_bind_addr(isert_lid, sa);
2620         if (ret) {
2621                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2622                 goto out_lid;
2623         }
2624
2625         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2626         if (ret) {
2627                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2628                 goto out_lid;
2629         }
2630
2631         isert_np->np_cm_id = isert_lid;
2632         np->np_context = isert_np;
2633         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2634
2635         return 0;
2636
2637 out_lid:
2638         rdma_destroy_id(isert_lid);
2639 out:
2640         kfree(isert_np);
2641         return ret;
2642 }
2643
2644 static int
2645 isert_rdma_accept(struct isert_conn *isert_conn)
2646 {
2647         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2648         struct rdma_conn_param cp;
2649         int ret;
2650
2651         memset(&cp, 0, sizeof(struct rdma_conn_param));
2652         cp.responder_resources = isert_conn->responder_resources;
2653         cp.initiator_depth = isert_conn->initiator_depth;
2654         cp.retry_count = 7;
2655         cp.rnr_retry_count = 7;
2656
2657         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2658
2659         ret = rdma_accept(cm_id, &cp);
2660         if (ret) {
2661                 pr_err("rdma_accept() failed with: %d\n", ret);
2662                 return ret;
2663         }
2664
2665         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2666
2667         return 0;
2668 }
2669
2670 static int
2671 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2672 {
2673         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2674         int ret;
2675
2676         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2677         /*
2678          * For login requests after the first PDU, isert_rx_login_req() will
2679          * kick schedule_delayed_work(&conn->login_work) as the packet is
2680          * received, which turns this callback from iscsi_target_do_login_rx()
2681          * into a NOP.
2682          */
2683         if (!login->first_request)
2684                 return 0;
2685
2686         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2687         if (ret)
2688                 return ret;
2689
2690         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2691         return 0;
2692 }
2693
2694 static void
2695 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2696                     struct isert_conn *isert_conn)
2697 {
2698         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2699         struct rdma_route *cm_route = &cm_id->route;
2700         struct sockaddr_in *sock_in;
2701         struct sockaddr_in6 *sock_in6;
2702
2703         conn->login_family = np->np_sockaddr.ss_family;
2704
2705         if (np->np_sockaddr.ss_family == AF_INET6) {
2706                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2707                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2708                          &sock_in6->sin6_addr.in6_u);
2709                 conn->login_port = ntohs(sock_in6->sin6_port);
2710
2711                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2712                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2713                          &sock_in6->sin6_addr.in6_u);
2714                 conn->local_port = ntohs(sock_in6->sin6_port);
2715         } else {
2716                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2717                 sprintf(conn->login_ip, "%pI4",
2718                         &sock_in->sin_addr.s_addr);
2719                 conn->login_port = ntohs(sock_in->sin_port);
2720
2721                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2722                 sprintf(conn->local_ip, "%pI4",
2723                         &sock_in->sin_addr.s_addr);
2724                 conn->local_port = ntohs(sock_in->sin_port);
2725         }
2726 }
2727
2728 static int
2729 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2730 {
2731         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2732         struct isert_conn *isert_conn;
2733         int max_accept = 0, ret;
2734
2735 accept_wait:
2736         ret = down_interruptible(&isert_np->np_sem);
2737         if (max_accept > 5)
2738                 return -ENODEV;
2739
2740         spin_lock_bh(&np->np_thread_lock);
2741         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2742                 spin_unlock_bh(&np->np_thread_lock);
2743                 pr_debug("np_thread_state %d for isert_accept_np\n",
2744                          np->np_thread_state);
2745                 /**
2746                  * No point in stalling here when np_thread
2747                  * is in state RESET/SHUTDOWN/EXIT - bail
2748                  **/
2749                 return -ENODEV;
2750         }
2751         spin_unlock_bh(&np->np_thread_lock);
2752
2753         mutex_lock(&isert_np->np_accept_mutex);
2754         if (list_empty(&isert_np->np_accept_list)) {
2755                 mutex_unlock(&isert_np->np_accept_mutex);
2756                 max_accept++;
2757                 goto accept_wait;
2758         }
2759         isert_conn = list_first_entry(&isert_np->np_accept_list,
2760                         struct isert_conn, conn_accept_node);
2761         list_del_init(&isert_conn->conn_accept_node);
2762         mutex_unlock(&isert_np->np_accept_mutex);
2763
2764         conn->context = isert_conn;
2765         isert_conn->conn = conn;
2766         max_accept = 0;
2767
2768         ret = isert_rdma_post_recvl(isert_conn);
2769         if (ret)
2770                 return ret;
2771
2772         ret = isert_rdma_accept(isert_conn);
2773         if (ret)
2774                 return ret;
2775
2776         isert_set_conn_info(np, conn, isert_conn);
2777
2778         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2779         return 0;
2780 }
2781
2782 static void
2783 isert_free_np(struct iscsi_np *np)
2784 {
2785         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2786
2787         if (isert_np->np_cm_id)
2788                 rdma_destroy_id(isert_np->np_cm_id);
2789
2790         np->np_context = NULL;
2791         kfree(isert_np);
2792 }
2793
2794 static void isert_wait_conn(struct iscsi_conn *conn)
2795 {
2796         struct isert_conn *isert_conn = conn->context;
2797
2798         pr_debug("isert_wait_conn: Starting \n");
2799
2800         mutex_lock(&isert_conn->conn_mutex);
2801         if (isert_conn->conn_cm_id) {
2802                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
2803                 rdma_disconnect(isert_conn->conn_cm_id);
2804         }
2805         /*
2806          * Only wait for conn_wait_comp_err if the isert_conn made it
2807          * into full feature phase..
2808          */
2809         if (isert_conn->state == ISER_CONN_INIT) {
2810                 mutex_unlock(&isert_conn->conn_mutex);
2811                 return;
2812         }
2813         if (isert_conn->state == ISER_CONN_UP)
2814                 isert_conn->state = ISER_CONN_TERMINATING;
2815         mutex_unlock(&isert_conn->conn_mutex);
2816
2817         wait_for_completion(&isert_conn->conn_wait_comp_err);
2818
2819         wait_for_completion(&isert_conn->conn_wait);
2820         isert_put_conn(isert_conn);
2821 }
2822
2823 static void isert_free_conn(struct iscsi_conn *conn)
2824 {
2825         struct isert_conn *isert_conn = conn->context;
2826
2827         isert_put_conn(isert_conn);
2828 }
2829
2830 static struct iscsit_transport iser_target_transport = {
2831         .name                   = "IB/iSER",
2832         .transport_type         = ISCSI_INFINIBAND,
2833         .priv_size              = sizeof(struct isert_cmd),
2834         .owner                  = THIS_MODULE,
2835         .iscsit_setup_np        = isert_setup_np,
2836         .iscsit_accept_np       = isert_accept_np,
2837         .iscsit_free_np         = isert_free_np,
2838         .iscsit_wait_conn       = isert_wait_conn,
2839         .iscsit_free_conn       = isert_free_conn,
2840         .iscsit_get_login_rx    = isert_get_login_rx,
2841         .iscsit_put_login_tx    = isert_put_login_tx,
2842         .iscsit_immediate_queue = isert_immediate_queue,
2843         .iscsit_response_queue  = isert_response_queue,
2844         .iscsit_get_dataout     = isert_get_dataout,
2845         .iscsit_queue_data_in   = isert_put_datain,
2846         .iscsit_queue_status    = isert_put_response,
2847 };
2848
2849 static int __init isert_init(void)
2850 {
2851         int ret;
2852
2853         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2854         if (!isert_rx_wq) {
2855                 pr_err("Unable to allocate isert_rx_wq\n");
2856                 return -ENOMEM;
2857         }
2858
2859         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2860         if (!isert_comp_wq) {
2861                 pr_err("Unable to allocate isert_comp_wq\n");
2862                 ret = -ENOMEM;
2863                 goto destroy_rx_wq;
2864         }
2865
2866         iscsit_register_transport(&iser_target_transport);
2867         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2868         return 0;
2869
2870 destroy_rx_wq:
2871         destroy_workqueue(isert_rx_wq);
2872         return ret;
2873 }
2874
2875 static void __exit isert_exit(void)
2876 {
2877         flush_scheduled_work();
2878         destroy_workqueue(isert_comp_wq);
2879         destroy_workqueue(isert_rx_wq);
2880         iscsit_unregister_transport(&iser_target_transport);
2881         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2882 }
2883
2884 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2885 MODULE_VERSION("0.1");
2886 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2887 MODULE_LICENSE("GPL");
2888
2889 module_init(isert_init);
2890 module_exit(isert_exit);