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