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 (isert_conn->conn_device->use_fastreg) {
 989                                 ret = isert_conn_create_fastreg_pool(isert_conn);
 990                                 if (ret) {
 991                                         pr_err("Conn: %p failed to create"
 992                                                " fastreg pool\n", isert_conn);
 993                                         return ret;
 994                                 }
 995                         }
 996
 997                         ret = isert_alloc_rx_descriptors(isert_conn);
 998                         if (ret)
 999                                 return ret;
1000
1001                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1002                         if (ret)
1003                                 return ret;
1004
1005                         isert_conn->state = ISER_CONN_UP;
1006                         goto post_send;
1007                 }
1008
1009                 ret = isert_rdma_post_recvl(isert_conn);
1010                 if (ret)
1011                         return ret;
1012         }
1013 post_send:
1014         ret = isert_post_send(isert_conn, tx_desc);
1015         if (ret)
1016                 return ret;
1017
1018         return 0;
1019 }
1020
1021 static void
1022 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1023                    struct isert_conn *isert_conn)
1024 {
1025         struct iscsi_conn *conn = isert_conn->conn;
1026         struct iscsi_login *login = conn->conn_login;
1027         int size;
1028
1029         if (!login) {
1030                 pr_err("conn->conn_login is NULL\n");
1031                 dump_stack();
1032                 return;
1033         }
1034
1035         if (login->first_request) {
1036                 struct iscsi_login_req *login_req =
1037                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1038                 /*
1039                  * Setup the initial iscsi_login values from the leading
1040                  * login request PDU.
1041                  */
1042                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1043                 login->current_stage =
1044                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1045                          >> 2;
1046                 login->version_min      = login_req->min_version;
1047                 login->version_max      = login_req->max_version;
1048                 memcpy(login->isid, login_req->isid, 6);
1049                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1050                 login->init_task_tag    = login_req->itt;
1051                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1052                 login->cid              = be16_to_cpu(login_req->cid);
1053                 login->tsih             = be16_to_cpu(login_req->tsih);
1054         }
1055
1056         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1057
1058         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1059         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1060                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1061         memcpy(login->req_buf, &rx_desc->data[0], size);
1062
1063         if (login->first_request) {
1064                 complete(&isert_conn->conn_login_comp);
1065                 return;
1066         }
1067         schedule_delayed_work(&conn->login_work, 0);
1068 }
1069
1070 static struct iscsi_cmd
1071 *isert_allocate_cmd(struct iscsi_conn *conn)
1072 {
1073         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1074         struct isert_cmd *isert_cmd;
1075         struct iscsi_cmd *cmd;
1076
1077         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1078         if (!cmd) {
1079                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1080                 return NULL;
1081         }
1082         isert_cmd = iscsit_priv_cmd(cmd);
1083         isert_cmd->conn = isert_conn;
1084         isert_cmd->iscsi_cmd = cmd;
1085
1086         return cmd;
1087 }
1088
1089 static int
1090 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1091                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1092                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1093 {
1094         struct iscsi_conn *conn = isert_conn->conn;
1095         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1096         struct scatterlist *sg;
1097         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1098         bool dump_payload = false;
1099
1100         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1101         if (rc < 0)
1102                 return rc;
1103
1104         imm_data = cmd->immediate_data;
1105         imm_data_len = cmd->first_burst_len;
1106         unsol_data = cmd->unsolicited_data;
1107
1108         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1109         if (rc < 0) {
1110                 return 0;
1111         } else if (rc > 0) {
1112                 dump_payload = true;
1113                 goto sequence_cmd;
1114         }
1115
1116         if (!imm_data)
1117                 return 0;
1118
1119         sg = &cmd->se_cmd.t_data_sg[0];
1120         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1121
1122         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1123                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1124
1125         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1126
1127         cmd->write_data_done += imm_data_len;
1128
1129         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1130                 spin_lock_bh(&cmd->istate_lock);
1131                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1132                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1133                 spin_unlock_bh(&cmd->istate_lock);
1134         }
1135
1136 sequence_cmd:
1137         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1138
1139         if (!rc && dump_payload == false && unsol_data)
1140                 iscsit_set_unsoliticed_dataout(cmd);
1141         else if (dump_payload && imm_data)
1142                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1143
1144         return 0;
1145 }
1146
1147 static int
1148 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1149                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1150 {
1151         struct scatterlist *sg_start;
1152         struct iscsi_conn *conn = isert_conn->conn;
1153         struct iscsi_cmd *cmd = NULL;
1154         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1155         u32 unsol_data_len = ntoh24(hdr->dlength);
1156         int rc, sg_nents, sg_off, page_off;
1157
1158         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1159         if (rc < 0)
1160                 return rc;
1161         else if (!cmd)
1162                 return 0;
1163         /*
1164          * FIXME: Unexpected unsolicited_data out
1165          */
1166         if (!cmd->unsolicited_data) {
1167                 pr_err("Received unexpected solicited data payload\n");
1168                 dump_stack();
1169                 return -1;
1170         }
1171
1172         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1173                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1174
1175         sg_off = cmd->write_data_done / PAGE_SIZE;
1176         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1177         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1178         page_off = cmd->write_data_done % PAGE_SIZE;
1179         /*
1180          * FIXME: Non page-aligned unsolicited_data out
1181          */
1182         if (page_off) {
1183                 pr_err("Received unexpected non-page aligned data payload\n");
1184                 dump_stack();
1185                 return -1;
1186         }
1187         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1188                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1189
1190         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1191                             unsol_data_len);
1192
1193         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1194         if (rc < 0)
1195                 return rc;
1196
1197         return 0;
1198 }
1199
1200 static int
1201 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1202                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1203                      unsigned char *buf)
1204 {
1205         struct iscsi_conn *conn = isert_conn->conn;
1206         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1207         int rc;
1208
1209         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1210         if (rc < 0)
1211                 return rc;
1212         /*
1213          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1214          */
1215
1216         return iscsit_process_nop_out(conn, cmd, hdr);
1217 }
1218
1219 static int
1220 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1221                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1222                       struct iscsi_text *hdr)
1223 {
1224         struct iscsi_conn *conn = isert_conn->conn;
1225         u32 payload_length = ntoh24(hdr->dlength);
1226         int rc;
1227         unsigned char *text_in;
1228
1229         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1230         if (rc < 0)
1231                 return rc;
1232
1233         text_in = kzalloc(payload_length, GFP_KERNEL);
1234         if (!text_in) {
1235                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1236                        payload_length);
1237                 return -ENOMEM;
1238         }
1239         cmd->text_in_ptr = text_in;
1240
1241         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1242
1243         return iscsit_process_text_cmd(conn, cmd, hdr);
1244 }
1245
1246 static int
1247 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1248                 uint32_t read_stag, uint64_t read_va,
1249                 uint32_t write_stag, uint64_t write_va)
1250 {
1251         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1252         struct iscsi_conn *conn = isert_conn->conn;
1253         struct iscsi_session *sess = conn->sess;
1254         struct iscsi_cmd *cmd;
1255         struct isert_cmd *isert_cmd;
1256         int ret = -EINVAL;
1257         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1258
1259         if (sess->sess_ops->SessionType &&
1260            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1261                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1262                        " ignoring\n", opcode);
1263                 return 0;
1264         }
1265
1266         switch (opcode) {
1267         case ISCSI_OP_SCSI_CMD:
1268                 cmd = isert_allocate_cmd(conn);
1269                 if (!cmd)
1270                         break;
1271
1272                 isert_cmd = iscsit_priv_cmd(cmd);
1273                 isert_cmd->read_stag = read_stag;
1274                 isert_cmd->read_va = read_va;
1275                 isert_cmd->write_stag = write_stag;
1276                 isert_cmd->write_va = write_va;
1277
1278                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1279                                         rx_desc, (unsigned char *)hdr);
1280                 break;
1281         case ISCSI_OP_NOOP_OUT:
1282                 cmd = isert_allocate_cmd(conn);
1283                 if (!cmd)
1284                         break;
1285
1286                 isert_cmd = iscsit_priv_cmd(cmd);
1287                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1288                                            rx_desc, (unsigned char *)hdr);
1289                 break;
1290         case ISCSI_OP_SCSI_DATA_OUT:
1291                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1292                                                 (unsigned char *)hdr);
1293                 break;
1294         case ISCSI_OP_SCSI_TMFUNC:
1295                 cmd = isert_allocate_cmd(conn);
1296                 if (!cmd)
1297                         break;
1298
1299                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1300                                                 (unsigned char *)hdr);
1301                 break;
1302         case ISCSI_OP_LOGOUT:
1303                 cmd = isert_allocate_cmd(conn);
1304                 if (!cmd)
1305                         break;
1306
1307                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1308                 if (ret > 0)
1309                         wait_for_completion_timeout(&conn->conn_logout_comp,
1310                                                     SECONDS_FOR_LOGOUT_COMP *
1311                                                     HZ);
1312                 break;
1313         case ISCSI_OP_TEXT:
1314                 cmd = isert_allocate_cmd(conn);
1315                 if (!cmd)
1316                         break;
1317
1318                 isert_cmd = iscsit_priv_cmd(cmd);
1319                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1320                                             rx_desc, (struct iscsi_text *)hdr);
1321                 break;
1322         default:
1323                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1324                 dump_stack();
1325                 break;
1326         }
1327
1328         return ret;
1329 }
1330
1331 static void
1332 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1333 {
1334         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1335         uint64_t read_va = 0, write_va = 0;
1336         uint32_t read_stag = 0, write_stag = 0;
1337         int rc;
1338
1339         switch (iser_hdr->flags & 0xF0) {
1340         case ISCSI_CTRL:
1341                 if (iser_hdr->flags & ISER_RSV) {
1342                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1343                         read_va = be64_to_cpu(iser_hdr->read_va);
1344                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1345                                  read_stag, (unsigned long long)read_va);
1346                 }
1347                 if (iser_hdr->flags & ISER_WSV) {
1348                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1349                         write_va = be64_to_cpu(iser_hdr->write_va);
1350                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1351                                  write_stag, (unsigned long long)write_va);
1352                 }
1353
1354                 pr_debug("ISER ISCSI_CTRL PDU\n");
1355                 break;
1356         case ISER_HELLO:
1357                 pr_err("iSER Hello message\n");
1358                 break;
1359         default:
1360                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1361                 break;
1362         }
1363
1364         rc = isert_rx_opcode(isert_conn, rx_desc,
1365                              read_stag, read_va, write_stag, write_va);
1366 }
1367
1368 static void
1369 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1370                     unsigned long xfer_len)
1371 {
1372         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1373         struct iscsi_hdr *hdr;
1374         u64 rx_dma;
1375         int rx_buflen, outstanding;
1376
1377         if ((char *)desc == isert_conn->login_req_buf) {
1378                 rx_dma = isert_conn->login_req_dma;
1379                 rx_buflen = ISER_RX_LOGIN_SIZE;
1380                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1381                          rx_dma, rx_buflen);
1382         } else {
1383                 rx_dma = desc->dma_addr;
1384                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1385                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1386                          rx_dma, rx_buflen);
1387         }
1388
1389         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1390
1391         hdr = &desc->iscsi_header;
1392         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1393                  hdr->opcode, hdr->itt, hdr->flags,
1394                  (int)(xfer_len - ISER_HEADERS_LEN));
1395
1396         if ((char *)desc == isert_conn->login_req_buf)
1397                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1398                                    isert_conn);
1399         else
1400                 isert_rx_do_work(desc, isert_conn);
1401
1402         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1403                                       DMA_FROM_DEVICE);
1404
1405         isert_conn->post_recv_buf_count--;
1406         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1407                  isert_conn->post_recv_buf_count);
1408
1409         if ((char *)desc == isert_conn->login_req_buf)
1410                 return;
1411
1412         outstanding = isert_conn->post_recv_buf_count;
1413         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1414                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1415                                 ISERT_MIN_POSTED_RX);
1416                 err = isert_post_recv(isert_conn, count);
1417                 if (err) {
1418                         pr_err("isert_post_recv() count: %d failed, %d\n",
1419                                count, err);
1420                 }
1421         }
1422 }
1423
1424 static void
1425 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1426 {
1427         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1428         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1429
1430         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1431         if (wr->sge) {
1432                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1433                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1434                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1435                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1436                 wr->sge = NULL;
1437         }
1438
1439         if (wr->send_wr) {
1440                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1441                 kfree(wr->send_wr);
1442                 wr->send_wr = NULL;
1443         }
1444
1445         if (wr->ib_sge) {
1446                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1447                 kfree(wr->ib_sge);
1448                 wr->ib_sge = NULL;
1449         }
1450 }
1451
1452 static void
1453 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1454 {
1455         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1456         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1457         LIST_HEAD(unmap_list);
1458
1459         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1460
1461         if (wr->fr_desc) {
1462                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1463                          isert_cmd, wr->fr_desc);
1464                 spin_lock_bh(&isert_conn->conn_lock);
1465                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1466                 spin_unlock_bh(&isert_conn->conn_lock);
1467                 wr->fr_desc = NULL;
1468         }
1469
1470         if (wr->sge) {
1471                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1472                 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1473                                 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1474                                 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1475                 wr->sge = NULL;
1476         }
1477
1478         wr->ib_sge = NULL;
1479         wr->send_wr = NULL;
1480 }
1481
1482 static void
1483 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1484 {
1485         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1486         struct isert_conn *isert_conn = isert_cmd->conn;
1487         struct iscsi_conn *conn = isert_conn->conn;
1488         struct isert_device *device = isert_conn->conn_device;
1489
1490         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1491
1492         switch (cmd->iscsi_opcode) {
1493         case ISCSI_OP_SCSI_CMD:
1494                 spin_lock_bh(&conn->cmd_lock);
1495                 if (!list_empty(&cmd->i_conn_node))
1496                         list_del_init(&cmd->i_conn_node);
1497                 spin_unlock_bh(&conn->cmd_lock);
1498
1499                 if (cmd->data_direction == DMA_TO_DEVICE) {
1500                         iscsit_stop_dataout_timer(cmd);
1501                         /*
1502                          * Check for special case during comp_err where
1503                          * WRITE_PENDING has been handed off from core,
1504                          * but requires an extra target_put_sess_cmd()
1505                          * before transport_generic_free_cmd() below.
1506                          */
1507                         if (comp_err &&
1508                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1509                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1510
1511                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1512                         }
1513                 }
1514
1515                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1516                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1517                 break;
1518         case ISCSI_OP_SCSI_TMFUNC:
1519                 spin_lock_bh(&conn->cmd_lock);
1520                 if (!list_empty(&cmd->i_conn_node))
1521                         list_del_init(&cmd->i_conn_node);
1522                 spin_unlock_bh(&conn->cmd_lock);
1523
1524                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1525                 break;
1526         case ISCSI_OP_REJECT:
1527         case ISCSI_OP_NOOP_OUT:
1528         case ISCSI_OP_TEXT:
1529                 spin_lock_bh(&conn->cmd_lock);
1530                 if (!list_empty(&cmd->i_conn_node))
1531                         list_del_init(&cmd->i_conn_node);
1532                 spin_unlock_bh(&conn->cmd_lock);
1533
1534                 /*
1535                  * Handle special case for REJECT when iscsi_add_reject*() has
1536                  * overwritten the original iscsi_opcode assignment, and the
1537                  * associated cmd->se_cmd needs to be released.
1538                  */
1539                 if (cmd->se_cmd.se_tfo != NULL) {
1540                         pr_debug("Calling transport_generic_free_cmd from"
1541                                  " isert_put_cmd for 0x%02x\n",
1542                                  cmd->iscsi_opcode);
1543                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1544                         break;
1545                 }
1546                 /*
1547                  * Fall-through
1548                  */
1549         default:
1550                 iscsit_release_cmd(cmd);
1551                 break;
1552         }
1553 }
1554
1555 static void
1556 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1557 {
1558         if (tx_desc->dma_addr != 0) {
1559                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1560                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1561                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1562                 tx_desc->dma_addr = 0;
1563         }
1564 }
1565
1566 static void
1567 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1568                      struct ib_device *ib_dev, bool comp_err)
1569 {
1570         if (isert_cmd->pdu_buf_dma != 0) {
1571                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1572                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1573                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1574                 isert_cmd->pdu_buf_dma = 0;
1575         }
1576
1577         isert_unmap_tx_desc(tx_desc, ib_dev);
1578         isert_put_cmd(isert_cmd, comp_err);
1579 }
1580
1581 static void
1582 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1583                            struct isert_cmd *isert_cmd)
1584 {
1585         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1586         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1587         struct se_cmd *se_cmd = &cmd->se_cmd;
1588         struct isert_conn *isert_conn = isert_cmd->conn;
1589         struct isert_device *device = isert_conn->conn_device;
1590
1591         iscsit_stop_dataout_timer(cmd);
1592         device->unreg_rdma_mem(isert_cmd, isert_conn);
1593         cmd->write_data_done = wr->cur_rdma_length;
1594         wr->send_wr_num = 0;
1595
1596         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1597         spin_lock_bh(&cmd->istate_lock);
1598         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1599         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1600         spin_unlock_bh(&cmd->istate_lock);
1601
1602         target_execute_cmd(se_cmd);
1603 }
1604
1605 static void
1606 isert_do_control_comp(struct work_struct *work)
1607 {
1608         struct isert_cmd *isert_cmd = container_of(work,
1609                         struct isert_cmd, comp_work);
1610         struct isert_conn *isert_conn = isert_cmd->conn;
1611         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1612         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1613
1614         switch (cmd->i_state) {
1615         case ISTATE_SEND_TASKMGTRSP:
1616                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1617
1618                 atomic_dec(&isert_conn->post_send_buf_count);
1619                 iscsit_tmr_post_handler(cmd, cmd->conn);
1620
1621                 cmd->i_state = ISTATE_SENT_STATUS;
1622                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1623                 break;
1624         case ISTATE_SEND_REJECT:
1625                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1626                 atomic_dec(&isert_conn->post_send_buf_count);
1627
1628                 cmd->i_state = ISTATE_SENT_STATUS;
1629                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1630                 break;
1631         case ISTATE_SEND_LOGOUTRSP:
1632                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1633
1634                 atomic_dec(&isert_conn->post_send_buf_count);
1635                 iscsit_logout_post_handler(cmd, cmd->conn);
1636                 break;
1637         case ISTATE_SEND_TEXTRSP:
1638                 atomic_dec(&isert_conn->post_send_buf_count);
1639                 cmd->i_state = ISTATE_SENT_STATUS;
1640                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1641                 break;
1642         default:
1643                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1644                 dump_stack();
1645                 break;
1646         }
1647 }
1648
1649 static void
1650 isert_response_completion(struct iser_tx_desc *tx_desc,
1651                           struct isert_cmd *isert_cmd,
1652                           struct isert_conn *isert_conn,
1653                           struct ib_device *ib_dev)
1654 {
1655         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1656         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1657
1658         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1659             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1660             cmd->i_state == ISTATE_SEND_REJECT ||
1661             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1662                 isert_unmap_tx_desc(tx_desc, ib_dev);
1663
1664                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1665                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1666                 return;
1667         }
1668         atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1669
1670         cmd->i_state = ISTATE_SENT_STATUS;
1671         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1672 }
1673
1674 static void
1675 __isert_send_completion(struct iser_tx_desc *tx_desc,
1676                         struct isert_conn *isert_conn)
1677 {
1678         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1679         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1680         struct isert_rdma_wr *wr;
1681
1682         if (!isert_cmd) {
1683                 atomic_dec(&isert_conn->post_send_buf_count);
1684                 isert_unmap_tx_desc(tx_desc, ib_dev);
1685                 return;
1686         }
1687         wr = &isert_cmd->rdma_wr;
1688
1689         switch (wr->iser_ib_op) {
1690         case ISER_IB_RECV:
1691                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1692                 dump_stack();
1693                 break;
1694         case ISER_IB_SEND:
1695                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1696                 isert_response_completion(tx_desc, isert_cmd,
1697                                           isert_conn, ib_dev);
1698                 break;
1699         case ISER_IB_RDMA_WRITE:
1700                 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1701                 dump_stack();
1702                 break;
1703         case ISER_IB_RDMA_READ:
1704                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1705
1706                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1707                 isert_completion_rdma_read(tx_desc, isert_cmd);
1708                 break;
1709         default:
1710                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1711                 dump_stack();
1712                 break;
1713         }
1714 }
1715
1716 static void
1717 isert_send_completion(struct iser_tx_desc *tx_desc,
1718                       struct isert_conn *isert_conn)
1719 {
1720         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1721         struct iser_tx_desc *t;
1722         /*
1723          * Drain coalesced completion llist starting from comp_llnode_batch
1724          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1725          */
1726         while (llnode) {
1727                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1728                 llnode = llist_next(llnode);
1729                 __isert_send_completion(t, isert_conn);
1730         }
1731         __isert_send_completion(tx_desc, isert_conn);
1732 }
1733
1734 static void
1735 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1736 {
1737         struct llist_node *llnode;
1738         struct isert_rdma_wr *wr;
1739         struct iser_tx_desc *t;
1740
1741         mutex_lock(&isert_conn->conn_mutex);
1742         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1743         isert_conn->conn_comp_batch = 0;
1744         mutex_unlock(&isert_conn->conn_mutex);
1745
1746         while (llnode) {
1747                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1748                 llnode = llist_next(llnode);
1749                 wr = &t->isert_cmd->rdma_wr;
1750
1751                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1752                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1753         }
1754 }
1755
1756 static void
1757 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1758 {
1759         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1760         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1761         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1762         struct isert_rdma_wr *wr;
1763         struct iser_tx_desc *t;
1764
1765         while (llnode) {
1766                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1767                 llnode = llist_next(llnode);
1768                 wr = &t->isert_cmd->rdma_wr;
1769
1770                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1771                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1772         }
1773         tx_desc->comp_llnode_batch = NULL;
1774
1775         if (!isert_cmd)
1776                 isert_unmap_tx_desc(tx_desc, ib_dev);
1777         else
1778                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1779 }
1780
1781 static void
1782 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1783 {
1784         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1785         struct iscsi_conn *conn = isert_conn->conn;
1786
1787         if (isert_conn->post_recv_buf_count)
1788                 return;
1789
1790         isert_cq_drain_comp_llist(isert_conn, ib_dev);
1791
1792         if (conn->sess) {
1793                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1794                 target_wait_for_sess_cmds(conn->sess->se_sess);
1795         }
1796
1797         while (atomic_read(&isert_conn->post_send_buf_count))
1798                 msleep(3000);
1799
1800         mutex_lock(&isert_conn->conn_mutex);
1801         isert_conn->state = ISER_CONN_DOWN;
1802         mutex_unlock(&isert_conn->conn_mutex);
1803
1804         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1805
1806         complete(&isert_conn->conn_wait_comp_err);
1807 }
1808
1809 static void
1810 isert_cq_tx_work(struct work_struct *work)
1811 {
1812         struct isert_cq_desc *cq_desc = container_of(work,
1813                                 struct isert_cq_desc, cq_tx_work);
1814         struct isert_device *device = cq_desc->device;
1815         int cq_index = cq_desc->cq_index;
1816         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1817         struct isert_conn *isert_conn;
1818         struct iser_tx_desc *tx_desc;
1819         struct ib_wc wc;
1820
1821         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1822                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1823                 isert_conn = wc.qp->qp_context;
1824
1825                 if (wc.status == IB_WC_SUCCESS) {
1826                         isert_send_completion(tx_desc, isert_conn);
1827                 } else {
1828                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1829                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
1830                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1831
1832                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
1833                                 if (tx_desc->llnode_active)
1834                                         continue;
1835
1836                                 atomic_dec(&isert_conn->post_send_buf_count);
1837                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
1838                         }
1839                 }
1840         }
1841
1842         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1843 }
1844
1845 static void
1846 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1847 {
1848         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1849
1850         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1851 }
1852
1853 static void
1854 isert_cq_rx_work(struct work_struct *work)
1855 {
1856         struct isert_cq_desc *cq_desc = container_of(work,
1857                         struct isert_cq_desc, cq_rx_work);
1858         struct isert_device *device = cq_desc->device;
1859         int cq_index = cq_desc->cq_index;
1860         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1861         struct isert_conn *isert_conn;
1862         struct iser_rx_desc *rx_desc;
1863         struct ib_wc wc;
1864         unsigned long xfer_len;
1865
1866         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1867                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1868                 isert_conn = wc.qp->qp_context;
1869
1870                 if (wc.status == IB_WC_SUCCESS) {
1871                         xfer_len = (unsigned long)wc.byte_len;
1872                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
1873                 } else {
1874                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1875                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
1876                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1877                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
1878                                          wc.vendor_err);
1879                         }
1880                         isert_conn->post_recv_buf_count--;
1881                         isert_cq_rx_comp_err(isert_conn);
1882                 }
1883         }
1884
1885         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1886 }
1887
1888 static void
1889 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1890 {
1891         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1892
1893         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1894 }
1895
1896 static int
1897 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1898 {
1899         struct ib_send_wr *wr_failed;
1900         int ret;
1901
1902         atomic_inc(&isert_conn->post_send_buf_count);
1903
1904         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1905                            &wr_failed);
1906         if (ret) {
1907                 pr_err("ib_post_send failed with %d\n", ret);
1908                 atomic_dec(&isert_conn->post_send_buf_count);
1909                 return ret;
1910         }
1911         return ret;
1912 }
1913
1914 static int
1915 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1916 {
1917         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1918         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1919         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1920         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1921                                 &isert_cmd->tx_desc.iscsi_header;
1922
1923         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1924         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1925         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1926         /*
1927          * Attach SENSE DATA payload to iSCSI Response PDU
1928          */
1929         if (cmd->se_cmd.sense_buffer &&
1930             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1931             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1932                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1933                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1934                 u32 padding, pdu_len;
1935
1936                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1937                                    cmd->sense_buffer);
1938                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1939
1940                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1941                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1942                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1943
1944                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1945                                 (void *)cmd->sense_buffer, pdu_len,
1946                                 DMA_TO_DEVICE);
1947
1948                 isert_cmd->pdu_buf_len = pdu_len;
1949                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
1950                 tx_dsg->length  = pdu_len;
1951                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1952                 isert_cmd->tx_desc.num_sge = 2;
1953         }
1954
1955         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
1956
1957         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1958
1959         return isert_post_response(isert_conn, isert_cmd);
1960 }
1961
1962 static int
1963 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1964                 bool nopout_response)
1965 {
1966         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1967         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1968         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1969
1970         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1971         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1972                                &isert_cmd->tx_desc.iscsi_header,
1973                                nopout_response);
1974         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1975         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1976
1977         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1978
1979         return isert_post_response(isert_conn, isert_cmd);
1980 }
1981
1982 static int
1983 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1984 {
1985         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1986         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1987         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1988
1989         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1990         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1991                                 &isert_cmd->tx_desc.iscsi_header);
1992         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1993         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1994
1995         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1996
1997         return isert_post_response(isert_conn, isert_cmd);
1998 }
1999
2000 static int
2001 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2002 {
2003         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2004         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2005         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2006
2007         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2008         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2009                                   &isert_cmd->tx_desc.iscsi_header);
2010         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2011         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2012
2013         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2014
2015         return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static int
2019 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2020 {
2021         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2022         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2023         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2024         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2025         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2026         struct iscsi_reject *hdr =
2027                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2028
2029         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2030         iscsit_build_reject(cmd, conn, hdr);
2031         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2032
2033         hton24(hdr->dlength, ISCSI_HDR_LEN);
2034         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2035                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2036                         DMA_TO_DEVICE);
2037         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2038         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2039         tx_dsg->length  = ISCSI_HDR_LEN;
2040         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2041         isert_cmd->tx_desc.num_sge = 2;
2042
2043         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2044
2045         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2046
2047         return isert_post_response(isert_conn, isert_cmd);
2048 }
2049
2050 static int
2051 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2052 {
2053         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2054         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2055         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2056         struct iscsi_text_rsp *hdr =
2057                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2058         u32 txt_rsp_len;
2059         int rc;
2060
2061         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2062         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2063         if (rc < 0)
2064                 return rc;
2065
2066         txt_rsp_len = rc;
2067         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2068
2069         if (txt_rsp_len) {
2070                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2071                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2072                 void *txt_rsp_buf = cmd->buf_ptr;
2073
2074                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2075                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2076
2077                 isert_cmd->pdu_buf_len = txt_rsp_len;
2078                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2079                 tx_dsg->length  = txt_rsp_len;
2080                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2081                 isert_cmd->tx_desc.num_sge = 2;
2082         }
2083         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2084
2085         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2086
2087         return isert_post_response(isert_conn, isert_cmd);
2088 }
2089
2090 static int
2091 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2092                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2093                     u32 data_left, u32 offset)
2094 {
2095         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2096         struct scatterlist *sg_start, *tmp_sg;
2097         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2098         u32 sg_off, page_off;
2099         int i = 0, sg_nents;
2100
2101         sg_off = offset / PAGE_SIZE;
2102         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2103         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2104         page_off = offset % PAGE_SIZE;
2105
2106         send_wr->sg_list = ib_sge;
2107         send_wr->num_sge = sg_nents;
2108         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2109         /*
2110          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2111          */
2112         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2113                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2114                          (unsigned long long)tmp_sg->dma_address,
2115                          tmp_sg->length, page_off);
2116
2117                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2118                 ib_sge->length = min_t(u32, data_left,
2119                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2120                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2121
2122                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2123                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2124                 page_off = 0;
2125                 data_left -= ib_sge->length;
2126                 ib_sge++;
2127                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2128         }
2129
2130         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2131                  send_wr->sg_list, send_wr->num_sge);
2132
2133         return sg_nents;
2134 }
2135
2136 static int
2137 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2138                struct isert_rdma_wr *wr)
2139 {
2140         struct se_cmd *se_cmd = &cmd->se_cmd;
2141         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2142         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2143         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2144         struct ib_send_wr *send_wr;
2145         struct ib_sge *ib_sge;
2146         struct scatterlist *sg_start;
2147         u32 sg_off = 0, sg_nents;
2148         u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
2149         int ret = 0, count, i, ib_sge_cnt;
2150
2151         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2152                 data_left = se_cmd->data_length;
2153         } else {
2154                 sg_off = cmd->write_data_done / PAGE_SIZE;
2155                 data_left = se_cmd->data_length - cmd->write_data_done;
2156                 offset = cmd->write_data_done;
2157                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2158         }
2159
2160         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2161         sg_nents = se_cmd->t_data_nents - sg_off;
2162
2163         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2164                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2165                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2166         if (unlikely(!count)) {
2167                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2168                 return -EINVAL;
2169         }
2170         wr->sge = sg_start;
2171         wr->num_sge = sg_nents;
2172         wr->cur_rdma_length = data_left;
2173         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2174                  isert_cmd, count, sg_start, sg_nents, data_left);
2175
2176         ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2177         if (!ib_sge) {
2178                 pr_warn("Unable to allocate ib_sge\n");
2179                 ret = -ENOMEM;
2180                 goto unmap_sg;
2181         }
2182         wr->ib_sge = ib_sge;
2183
2184         wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2185         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2186                                 GFP_KERNEL);
2187         if (!wr->send_wr) {
2188                 pr_debug("Unable to allocate wr->send_wr\n");
2189                 ret = -ENOMEM;
2190                 goto unmap_sg;
2191         }
2192
2193         wr->isert_cmd = isert_cmd;
2194         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2195
2196         for (i = 0; i < wr->send_wr_num; i++) {
2197                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2198                 data_len = min(data_left, rdma_write_max);
2199
2200                 send_wr->send_flags = 0;
2201                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2202                         send_wr->opcode = IB_WR_RDMA_WRITE;
2203                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2204                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2205                         if (i + 1 == wr->send_wr_num)
2206                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2207                         else
2208                                 send_wr->next = &wr->send_wr[i + 1];
2209                 } else {
2210                         send_wr->opcode = IB_WR_RDMA_READ;
2211                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2212                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2213                         if (i + 1 == wr->send_wr_num)
2214                                 send_wr->send_flags = IB_SEND_SIGNALED;
2215                         else
2216                                 send_wr->next = &wr->send_wr[i + 1];
2217                 }
2218
2219                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2220                                         send_wr, data_len, offset);
2221                 ib_sge += ib_sge_cnt;
2222
2223                 offset += data_len;
2224                 va_offset += data_len;
2225                 data_left -= data_len;
2226         }
2227
2228         return 0;
2229 unmap_sg:
2230         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2231                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2232                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2233         return ret;
2234 }
2235
2236 static int
2237 isert_map_fr_pagelist(struct ib_device *ib_dev,
2238                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2239 {
2240         u64 start_addr, end_addr, page, chunk_start = 0;
2241         struct scatterlist *tmp_sg;
2242         int i = 0, new_chunk, last_ent, n_pages;
2243
2244         n_pages = 0;
2245         new_chunk = 1;
2246         last_ent = sg_nents - 1;
2247         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2248                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2249                 if (new_chunk)
2250                         chunk_start = start_addr;
2251                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2252
2253                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2254                          i, (unsigned long long)tmp_sg->dma_address,
2255                          tmp_sg->length);
2256
2257                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2258                         new_chunk = 0;
2259                         continue;
2260                 }
2261                 new_chunk = 1;
2262
2263                 page = chunk_start & PAGE_MASK;
2264                 do {
2265                         fr_pl[n_pages++] = page;
2266                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2267                                  n_pages - 1, page);
2268                         page += PAGE_SIZE;
2269                 } while (page < end_addr);
2270         }
2271
2272         return n_pages;
2273 }
2274
2275 static int
2276 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
2277                   struct isert_conn *isert_conn, struct scatterlist *sg_start,
2278                   struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
2279                   unsigned int data_len)
2280 {
2281         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2282         struct ib_send_wr fr_wr, inv_wr;
2283         struct ib_send_wr *bad_wr, *wr = NULL;
2284         int ret, pagelist_len;
2285         u32 page_off;
2286         u8 key;
2287
2288         sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
2289         page_off = offset % PAGE_SIZE;
2290
2291         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2292                  fr_desc, sg_nents, offset);
2293
2294         pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2295                                              &fr_desc->data_frpl->page_list[0]);
2296
2297         if (!fr_desc->valid) {
2298                 memset(&inv_wr, 0, sizeof(inv_wr));
2299                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2300                 inv_wr.opcode = IB_WR_LOCAL_INV;
2301                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2302                 wr = &inv_wr;
2303                 /* Bump the key */
2304                 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2305                 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2306         }
2307
2308         /* Prepare FASTREG WR */
2309         memset(&fr_wr, 0, sizeof(fr_wr));
2310         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2311         fr_wr.opcode = IB_WR_FAST_REG_MR;
2312         fr_wr.wr.fast_reg.iova_start =
2313                 fr_desc->data_frpl->page_list[0] + page_off;
2314         fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2315         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2316         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2317         fr_wr.wr.fast_reg.length = data_len;
2318         fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2319         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2320
2321         if (!wr)
2322                 wr = &fr_wr;
2323         else
2324                 wr->next = &fr_wr;
2325
2326         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2327         if (ret) {
2328                 pr_err("fast registration failed, ret:%d\n", ret);
2329                 return ret;
2330         }
2331         fr_desc->valid = false;
2332
2333         ib_sge->lkey = fr_desc->data_mr->lkey;
2334         ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2335         ib_sge->length = data_len;
2336
2337         pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2338                  ib_sge->addr, ib_sge->length, ib_sge->lkey);
2339
2340         return ret;
2341 }
2342
2343 static int
2344 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2345                struct isert_rdma_wr *wr)
2346 {
2347         struct se_cmd *se_cmd = &cmd->se_cmd;
2348         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2349         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2350         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2351         struct ib_send_wr *send_wr;
2352         struct ib_sge *ib_sge;
2353         struct scatterlist *sg_start;
2354         struct fast_reg_descriptor *fr_desc;
2355         u32 sg_off = 0, sg_nents;
2356         u32 offset = 0, data_len, data_left, rdma_write_max;
2357         int ret = 0, count;
2358         unsigned long flags;
2359
2360         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2361                 data_left = se_cmd->data_length;
2362         } else {
2363                 offset = cmd->write_data_done;
2364                 sg_off = offset / PAGE_SIZE;
2365                 data_left = se_cmd->data_length - cmd->write_data_done;
2366                 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2367         }
2368
2369         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2370         sg_nents = se_cmd->t_data_nents - sg_off;
2371
2372         count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2373                               (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2374                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
2375         if (unlikely(!count)) {
2376                 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2377                 return -EINVAL;
2378         }
2379         wr->sge = sg_start;
2380         wr->num_sge = sg_nents;
2381         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2382                  isert_cmd, count, sg_start, sg_nents, data_left);
2383
2384         memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2385         ib_sge = &wr->s_ib_sge;
2386         wr->ib_sge = ib_sge;
2387
2388         wr->send_wr_num = 1;
2389         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2390         wr->send_wr = &wr->s_send_wr;
2391
2392         wr->isert_cmd = isert_cmd;
2393         rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2394
2395         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2396         send_wr->sg_list = ib_sge;
2397         send_wr->num_sge = 1;
2398         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2399         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2400                 send_wr->opcode = IB_WR_RDMA_WRITE;
2401                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2402                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2403                 send_wr->send_flags = 0;
2404                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2405         } else {
2406                 send_wr->opcode = IB_WR_RDMA_READ;
2407                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2408                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2409                 send_wr->send_flags = IB_SEND_SIGNALED;
2410         }
2411
2412         data_len = min(data_left, rdma_write_max);
2413         wr->cur_rdma_length = data_len;
2414
2415         /* if there is a single dma entry, dma mr is sufficient */
2416         if (count == 1) {
2417                 ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
2418                 ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
2419                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2420                 wr->fr_desc = NULL;
2421         } else {
2422                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2423                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2424                                            struct fast_reg_descriptor, list);
2425                 list_del(&fr_desc->list);
2426                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2427                 wr->fr_desc = fr_desc;
2428
2429                 ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
2430                                         ib_sge, sg_nents, offset, data_len);
2431                 if (ret) {
2432                         list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2433                         goto unmap_sg;
2434                 }
2435         }
2436
2437         return 0;
2438
2439 unmap_sg:
2440         ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2441                         (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2442                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
2443         return ret;
2444 }
2445
2446 static int
2447 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2448 {
2449         struct se_cmd *se_cmd = &cmd->se_cmd;
2450         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2451         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2452         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2453         struct isert_device *device = isert_conn->conn_device;
2454         struct ib_send_wr *wr_failed;
2455         int rc;
2456
2457         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2458                  isert_cmd, se_cmd->data_length);
2459         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2460         rc = device->reg_rdma_mem(conn, cmd, wr);
2461         if (rc) {
2462                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2463                 return rc;
2464         }
2465
2466         /*
2467          * Build isert_conn->tx_desc for iSCSI response PDU and attach
2468          */
2469         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2470         iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2471                              &isert_cmd->tx_desc.iscsi_header);
2472         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2473         isert_init_send_wr(isert_conn, isert_cmd,
2474                            &isert_cmd->tx_desc.send_wr, true);
2475
2476         atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2477
2478         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2479         if (rc) {
2480                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2481                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2482         }
2483         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2484                  isert_cmd);
2485
2486         return 1;
2487 }
2488
2489 static int
2490 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2491 {
2492         struct se_cmd *se_cmd = &cmd->se_cmd;
2493         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2494         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2495         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2496         struct isert_device *device = isert_conn->conn_device;
2497         struct ib_send_wr *wr_failed;
2498         int rc;
2499
2500         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2501                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2502         wr->iser_ib_op = ISER_IB_RDMA_READ;
2503         rc = device->reg_rdma_mem(conn, cmd, wr);
2504         if (rc) {
2505                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2506                 return rc;
2507         }
2508
2509         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2510
2511         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2512         if (rc) {
2513                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2514                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2515         }
2516         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2517                  isert_cmd);
2518
2519         return 0;
2520 }
2521
2522 static int
2523 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2524 {
2525         int ret;
2526
2527         switch (state) {
2528         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2529                 ret = isert_put_nopin(cmd, conn, false);
2530                 break;
2531         default:
2532                 pr_err("Unknown immediate state: 0x%02x\n", state);
2533                 ret = -EINVAL;
2534                 break;
2535         }
2536
2537         return ret;
2538 }
2539
2540 static int
2541 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2542 {
2543         int ret;
2544
2545         switch (state) {
2546         case ISTATE_SEND_LOGOUTRSP:
2547                 ret = isert_put_logout_rsp(cmd, conn);
2548                 if (!ret) {
2549                         pr_debug("Returning iSER Logout -EAGAIN\n");
2550                         ret = -EAGAIN;
2551                 }
2552                 break;
2553         case ISTATE_SEND_NOPIN:
2554                 ret = isert_put_nopin(cmd, conn, true);
2555                 break;
2556         case ISTATE_SEND_TASKMGTRSP:
2557                 ret = isert_put_tm_rsp(cmd, conn);
2558                 break;
2559         case ISTATE_SEND_REJECT:
2560                 ret = isert_put_reject(cmd, conn);
2561                 break;
2562         case ISTATE_SEND_TEXTRSP:
2563                 ret = isert_put_text_rsp(cmd, conn);
2564                 break;
2565         case ISTATE_SEND_STATUS:
2566                 /*
2567                  * Special case for sending non GOOD SCSI status from TX thread
2568                  * context during pre se_cmd excecution failure.
2569                  */
2570                 ret = isert_put_response(conn, cmd);
2571                 break;
2572         default:
2573                 pr_err("Unknown response state: 0x%02x\n", state);
2574                 ret = -EINVAL;
2575                 break;
2576         }
2577
2578         return ret;
2579 }
2580
2581 static int
2582 isert_setup_np(struct iscsi_np *np,
2583                struct __kernel_sockaddr_storage *ksockaddr)
2584 {
2585         struct isert_np *isert_np;
2586         struct rdma_cm_id *isert_lid;
2587         struct sockaddr *sa;
2588         int ret;
2589
2590         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2591         if (!isert_np) {
2592                 pr_err("Unable to allocate struct isert_np\n");
2593                 return -ENOMEM;
2594         }
2595         sema_init(&isert_np->np_sem, 0);
2596         mutex_init(&isert_np->np_accept_mutex);
2597         INIT_LIST_HEAD(&isert_np->np_accept_list);
2598         init_completion(&isert_np->np_login_comp);
2599
2600         sa = (struct sockaddr *)ksockaddr;
2601         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2602         /*
2603          * Setup the np->np_sockaddr from the passed sockaddr setup
2604          * in iscsi_target_configfs.c code..
2605          */
2606         memcpy(&np->np_sockaddr, ksockaddr,
2607                sizeof(struct __kernel_sockaddr_storage));
2608
2609         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2610                                 IB_QPT_RC);
2611         if (IS_ERR(isert_lid)) {
2612                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2613                        PTR_ERR(isert_lid));
2614                 ret = PTR_ERR(isert_lid);
2615                 goto out;
2616         }
2617
2618         ret = rdma_bind_addr(isert_lid, sa);
2619         if (ret) {
2620                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2621                 goto out_lid;
2622         }
2623
2624         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2625         if (ret) {
2626                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2627                 goto out_lid;
2628         }
2629
2630         isert_np->np_cm_id = isert_lid;
2631         np->np_context = isert_np;
2632         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2633
2634         return 0;
2635
2636 out_lid:
2637         rdma_destroy_id(isert_lid);
2638 out:
2639         kfree(isert_np);
2640         return ret;
2641 }
2642
2643 static int
2644 isert_rdma_accept(struct isert_conn *isert_conn)
2645 {
2646         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2647         struct rdma_conn_param cp;
2648         int ret;
2649
2650         memset(&cp, 0, sizeof(struct rdma_conn_param));
2651         cp.responder_resources = isert_conn->responder_resources;
2652         cp.initiator_depth = isert_conn->initiator_depth;
2653         cp.retry_count = 7;
2654         cp.rnr_retry_count = 7;
2655
2656         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2657
2658         ret = rdma_accept(cm_id, &cp);
2659         if (ret) {
2660                 pr_err("rdma_accept() failed with: %d\n", ret);
2661                 return ret;
2662         }
2663
2664         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2665
2666         return 0;
2667 }
2668
2669 static int
2670 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2671 {
2672         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2673         int ret;
2674
2675         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2676         /*
2677          * For login requests after the first PDU, isert_rx_login_req() will
2678          * kick schedule_delayed_work(&conn->login_work) as the packet is
2679          * received, which turns this callback from iscsi_target_do_login_rx()
2680          * into a NOP.
2681          */
2682         if (!login->first_request)
2683                 return 0;
2684
2685         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2686         if (ret)
2687                 return ret;
2688
2689         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2690         return 0;
2691 }
2692
2693 static void
2694 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2695                     struct isert_conn *isert_conn)
2696 {
2697         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2698         struct rdma_route *cm_route = &cm_id->route;
2699         struct sockaddr_in *sock_in;
2700         struct sockaddr_in6 *sock_in6;
2701
2702         conn->login_family = np->np_sockaddr.ss_family;
2703
2704         if (np->np_sockaddr.ss_family == AF_INET6) {
2705                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2706                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2707                          &sock_in6->sin6_addr.in6_u);
2708                 conn->login_port = ntohs(sock_in6->sin6_port);
2709
2710                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2711                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2712                          &sock_in6->sin6_addr.in6_u);
2713                 conn->local_port = ntohs(sock_in6->sin6_port);
2714         } else {
2715                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2716                 sprintf(conn->login_ip, "%pI4",
2717                         &sock_in->sin_addr.s_addr);
2718                 conn->login_port = ntohs(sock_in->sin_port);
2719
2720                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2721                 sprintf(conn->local_ip, "%pI4",
2722                         &sock_in->sin_addr.s_addr);
2723                 conn->local_port = ntohs(sock_in->sin_port);
2724         }
2725 }
2726
2727 static int
2728 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2729 {
2730         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2731         struct isert_conn *isert_conn;
2732         int max_accept = 0, ret;
2733
2734 accept_wait:
2735         ret = down_interruptible(&isert_np->np_sem);
2736         if (max_accept > 5)
2737                 return -ENODEV;
2738
2739         spin_lock_bh(&np->np_thread_lock);
2740         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2741                 spin_unlock_bh(&np->np_thread_lock);
2742                 pr_debug("np_thread_state %d for isert_accept_np\n",
2743                          np->np_thread_state);
2744                 /**
2745                  * No point in stalling here when np_thread
2746                  * is in state RESET/SHUTDOWN/EXIT - bail
2747                  **/
2748                 return -ENODEV;
2749         }
2750         spin_unlock_bh(&np->np_thread_lock);
2751
2752         mutex_lock(&isert_np->np_accept_mutex);
2753         if (list_empty(&isert_np->np_accept_list)) {
2754                 mutex_unlock(&isert_np->np_accept_mutex);
2755                 max_accept++;
2756                 goto accept_wait;
2757         }
2758         isert_conn = list_first_entry(&isert_np->np_accept_list,
2759                         struct isert_conn, conn_accept_node);
2760         list_del_init(&isert_conn->conn_accept_node);
2761         mutex_unlock(&isert_np->np_accept_mutex);
2762
2763         conn->context = isert_conn;
2764         isert_conn->conn = conn;
2765         max_accept = 0;
2766
2767         ret = isert_rdma_post_recvl(isert_conn);
2768         if (ret)
2769                 return ret;
2770
2771         ret = isert_rdma_accept(isert_conn);
2772         if (ret)
2773                 return ret;
2774
2775         isert_set_conn_info(np, conn, isert_conn);
2776
2777         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2778         return 0;
2779 }
2780
2781 static void
2782 isert_free_np(struct iscsi_np *np)
2783 {
2784         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2785
2786         if (isert_np->np_cm_id)
2787                 rdma_destroy_id(isert_np->np_cm_id);
2788
2789         np->np_context = NULL;
2790         kfree(isert_np);
2791 }
2792
2793 static void isert_wait_conn(struct iscsi_conn *conn)
2794 {
2795         struct isert_conn *isert_conn = conn->context;
2796
2797         pr_debug("isert_wait_conn: Starting \n");
2798
2799         mutex_lock(&isert_conn->conn_mutex);
2800         if (isert_conn->conn_cm_id) {
2801                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
2802                 rdma_disconnect(isert_conn->conn_cm_id);
2803         }
2804         /*
2805          * Only wait for conn_wait_comp_err if the isert_conn made it
2806          * into full feature phase..
2807          */
2808         if (isert_conn->state == ISER_CONN_INIT) {
2809                 mutex_unlock(&isert_conn->conn_mutex);
2810                 return;
2811         }
2812         if (isert_conn->state == ISER_CONN_UP)
2813                 isert_conn->state = ISER_CONN_TERMINATING;
2814         mutex_unlock(&isert_conn->conn_mutex);
2815
2816         wait_for_completion(&isert_conn->conn_wait_comp_err);
2817
2818         wait_for_completion(&isert_conn->conn_wait);
2819         isert_put_conn(isert_conn);
2820 }
2821
2822 static void isert_free_conn(struct iscsi_conn *conn)
2823 {
2824         struct isert_conn *isert_conn = conn->context;
2825
2826         isert_put_conn(isert_conn);
2827 }
2828
2829 static struct iscsit_transport iser_target_transport = {
2830         .name                   = "IB/iSER",
2831         .transport_type         = ISCSI_INFINIBAND,
2832         .priv_size              = sizeof(struct isert_cmd),
2833         .owner                  = THIS_MODULE,
2834         .iscsit_setup_np        = isert_setup_np,
2835         .iscsit_accept_np       = isert_accept_np,
2836         .iscsit_free_np         = isert_free_np,
2837         .iscsit_wait_conn       = isert_wait_conn,
2838         .iscsit_free_conn       = isert_free_conn,
2839         .iscsit_get_login_rx    = isert_get_login_rx,
2840         .iscsit_put_login_tx    = isert_put_login_tx,
2841         .iscsit_immediate_queue = isert_immediate_queue,
2842         .iscsit_response_queue  = isert_response_queue,
2843         .iscsit_get_dataout     = isert_get_dataout,
2844         .iscsit_queue_data_in   = isert_put_datain,
2845         .iscsit_queue_status    = isert_put_response,
2846 };
2847
2848 static int __init isert_init(void)
2849 {
2850         int ret;
2851
2852         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2853         if (!isert_rx_wq) {
2854                 pr_err("Unable to allocate isert_rx_wq\n");
2855                 return -ENOMEM;
2856         }
2857
2858         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2859         if (!isert_comp_wq) {
2860                 pr_err("Unable to allocate isert_comp_wq\n");
2861                 ret = -ENOMEM;
2862                 goto destroy_rx_wq;
2863         }
2864
2865         iscsit_register_transport(&iser_target_transport);
2866         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2867         return 0;
2868
2869 destroy_rx_wq:
2870         destroy_workqueue(isert_rx_wq);
2871         return ret;
2872 }
2873
2874 static void __exit isert_exit(void)
2875 {
2876         flush_scheduled_work();
2877         destroy_workqueue(isert_comp_wq);
2878         destroy_workqueue(isert_rx_wq);
2879         iscsit_unregister_transport(&iser_target_transport);
2880         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2881 }
2882
2883 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2884 MODULE_VERSION("0.1");
2885 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2886 MODULE_LICENSE("GPL");
2887
2888 module_init(isert_init);
2889 module_exit(isert_exit);