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