drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31
  32 #include "isert_proto.h"
  33 #include "ib_isert.h"
  34
  35 #define ISERT_MAX_CONN          8
  36 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  37 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  38
  39 static DEFINE_MUTEX(device_list_mutex);
  40 static LIST_HEAD(device_list);
  41 static struct workqueue_struct *isert_rx_wq;
  42 static struct workqueue_struct *isert_comp_wq;
  43
  44 static void
  45 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  46 static int
  47 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  48                struct isert_rdma_wr *wr);
  49 static void
  50 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  51 static int
  52 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  53                struct isert_rdma_wr *wr);
  54 static int
  55 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  56
  57 static void
  58 isert_qp_event_callback(struct ib_event *e, void *context)
  59 {
  60         struct isert_conn *isert_conn = (struct isert_conn *)context;
  61
  62         pr_err("isert_qp_event_callback event: %d\n", e->event);
  63         switch (e->event) {
  64         case IB_EVENT_COMM_EST:
  65                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  66                 break;
  67         case IB_EVENT_QP_LAST_WQE_REACHED:
  68                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  69                 break;
  70         default:
  71                 break;
  72         }
  73 }
  74
  75 static int
  76 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  77 {
  78         int ret;
  79
  80         ret = ib_query_device(ib_dev, devattr);
  81         if (ret) {
  82                 pr_err("ib_query_device() failed: %d\n", ret);
  83                 return ret;
  84         }
  85         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  86         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  87
  88         return 0;
  89 }
  90
  91 static int
  92 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  93                     u8 protection)
  94 {
  95         struct isert_device *device = isert_conn->conn_device;
  96         struct ib_qp_init_attr attr;
  97         int ret, index, min_index = 0;
  98
  99         mutex_lock(&device_list_mutex);
 100         for (index = 0; index < device->cqs_used; index++)
 101                 if (device->cq_active_qps[index] <
 102                     device->cq_active_qps[min_index])
 103                         min_index = index;
 104         device->cq_active_qps[min_index]++;
 105         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 106         mutex_unlock(&device_list_mutex);
 107
 108         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 109         attr.event_handler = isert_qp_event_callback;
 110         attr.qp_context = isert_conn;
 111         attr.send_cq = device->dev_tx_cq[min_index];
 112         attr.recv_cq = device->dev_rx_cq[min_index];
 113         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 114         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 115         /*
 116          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 117          * work-around for RDMA_READ..
 118          */
 119         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 120         isert_conn->max_sge = attr.cap.max_send_sge;
 121
 122         attr.cap.max_recv_sge = 1;
 123         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 124         attr.qp_type = IB_QPT_RC;
 125         if (protection)
 126                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 127
 128         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 129                  cma_id->device);
 130         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 131                  isert_conn->conn_pd->device);
 132
 133         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 134         if (ret) {
 135                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 136                 return ret;
 137         }
 138         isert_conn->conn_qp = cma_id->qp;
 139         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 140
 141         return 0;
 142 }
 143
 144 static void
 145 isert_cq_event_callback(struct ib_event *e, void *context)
 146 {
 147         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 148 }
 149
 150 static int
 151 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 152 {
 153         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 154         struct iser_rx_desc *rx_desc;
 155         struct ib_sge *rx_sg;
 156         u64 dma_addr;
 157         int i, j;
 158
 159         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 160                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 161         if (!isert_conn->conn_rx_descs)
 162                 goto fail;
 163
 164         rx_desc = isert_conn->conn_rx_descs;
 165
 166         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 167                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 168                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 169                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 170                         goto dma_map_fail;
 171
 172                 rx_desc->dma_addr = dma_addr;
 173
 174                 rx_sg = &rx_desc->rx_sg;
 175                 rx_sg->addr = rx_desc->dma_addr;
 176                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 177                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 178         }
 179
 180         isert_conn->conn_rx_desc_head = 0;
 181         return 0;
 182
 183 dma_map_fail:
 184         rx_desc = isert_conn->conn_rx_descs;
 185         for (j = 0; j < i; j++, rx_desc++) {
 186                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 187                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 188         }
 189         kfree(isert_conn->conn_rx_descs);
 190         isert_conn->conn_rx_descs = NULL;
 191 fail:
 192         return -ENOMEM;
 193 }
 194
 195 static void
 196 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 197 {
 198         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 199         struct iser_rx_desc *rx_desc;
 200         int i;
 201
 202         if (!isert_conn->conn_rx_descs)
 203                 return;
 204
 205         rx_desc = isert_conn->conn_rx_descs;
 206         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 207                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 208                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 209         }
 210
 211         kfree(isert_conn->conn_rx_descs);
 212         isert_conn->conn_rx_descs = NULL;
 213 }
 214
 215 static void isert_cq_tx_work(struct work_struct *);
 216 static void isert_cq_tx_callback(struct ib_cq *, void *);
 217 static void isert_cq_rx_work(struct work_struct *);
 218 static void isert_cq_rx_callback(struct ib_cq *, void *);
 219
 220 static int
 221 isert_create_device_ib_res(struct isert_device *device)
 222 {
 223         struct ib_device *ib_dev = device->ib_device;
 224         struct isert_cq_desc *cq_desc;
 225         struct ib_device_attr *dev_attr;
 226         int ret = 0, i, j;
 227
 228         dev_attr = &device->dev_attr;
 229         ret = isert_query_device(ib_dev, dev_attr);
 230         if (ret)
 231                 return ret;
 232
 233         /* asign function handlers */
 234         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
 235                 device->use_fastreg = 1;
 236                 device->reg_rdma_mem = isert_reg_rdma;
 237                 device->unreg_rdma_mem = isert_unreg_rdma;
 238         } else {
 239                 device->use_fastreg = 0;
 240                 device->reg_rdma_mem = isert_map_rdma;
 241                 device->unreg_rdma_mem = isert_unmap_cmd;
 242         }
 243
 244         /* Check signature cap */
 245         device->pi_capable = dev_attr->device_cap_flags &
 246                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 247
 248         device->cqs_used = min_t(int, num_online_cpus(),
 249                                  device->ib_device->num_comp_vectors);
 250         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 251         pr_debug("Using %d CQs, device %s supports %d vectors support "
 252                  "Fast registration %d pi_capable %d\n",
 253                  device->cqs_used, device->ib_device->name,
 254                  device->ib_device->num_comp_vectors, device->use_fastreg,
 255                  device->pi_capable);
 256         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 257                                 device->cqs_used, GFP_KERNEL);
 258         if (!device->cq_desc) {
 259                 pr_err("Unable to allocate device->cq_desc\n");
 260                 return -ENOMEM;
 261         }
 262         cq_desc = device->cq_desc;
 263
 264         for (i = 0; i < device->cqs_used; i++) {
 265                 cq_desc[i].device = device;
 266                 cq_desc[i].cq_index = i;
 267
 268                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 269                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 270                                                 isert_cq_rx_callback,
 271                                                 isert_cq_event_callback,
 272                                                 (void *)&cq_desc[i],
 273                                                 ISER_MAX_RX_CQ_LEN, i);
 274                 if (IS_ERR(device->dev_rx_cq[i])) {
 275                         ret = PTR_ERR(device->dev_rx_cq[i]);
 276                         device->dev_rx_cq[i] = NULL;
 277                         goto out_cq;
 278                 }
 279
 280                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 281                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 282                                                 isert_cq_tx_callback,
 283                                                 isert_cq_event_callback,
 284                                                 (void *)&cq_desc[i],
 285                                                 ISER_MAX_TX_CQ_LEN, i);
 286                 if (IS_ERR(device->dev_tx_cq[i])) {
 287                         ret = PTR_ERR(device->dev_tx_cq[i]);
 288                         device->dev_tx_cq[i] = NULL;
 289                         goto out_cq;
 290                 }
 291
 292                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 293                 if (ret)
 294                         goto out_cq;
 295
 296                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 297                 if (ret)
 298                         goto out_cq;
 299         }
 300
 301         return 0;
 302
 303 out_cq:
 304         for (j = 0; j < i; j++) {
 305                 cq_desc = &device->cq_desc[j];
 306
 307                 if (device->dev_rx_cq[j]) {
 308                         cancel_work_sync(&cq_desc->cq_rx_work);
 309                         ib_destroy_cq(device->dev_rx_cq[j]);
 310                 }
 311                 if (device->dev_tx_cq[j]) {
 312                         cancel_work_sync(&cq_desc->cq_tx_work);
 313                         ib_destroy_cq(device->dev_tx_cq[j]);
 314                 }
 315         }
 316         kfree(device->cq_desc);
 317
 318         return ret;
 319 }
 320
 321 static void
 322 isert_free_device_ib_res(struct isert_device *device)
 323 {
 324         struct isert_cq_desc *cq_desc;
 325         int i;
 326
 327         for (i = 0; i < device->cqs_used; i++) {
 328                 cq_desc = &device->cq_desc[i];
 329
 330                 cancel_work_sync(&cq_desc->cq_rx_work);
 331                 cancel_work_sync(&cq_desc->cq_tx_work);
 332                 ib_destroy_cq(device->dev_rx_cq[i]);
 333                 ib_destroy_cq(device->dev_tx_cq[i]);
 334                 device->dev_rx_cq[i] = NULL;
 335                 device->dev_tx_cq[i] = NULL;
 336         }
 337
 338         kfree(device->cq_desc);
 339 }
 340
 341 static void
 342 isert_device_try_release(struct isert_device *device)
 343 {
 344         mutex_lock(&device_list_mutex);
 345         device->refcount--;
 346         if (!device->refcount) {
 347                 isert_free_device_ib_res(device);
 348                 list_del(&device->dev_node);
 349                 kfree(device);
 350         }
 351         mutex_unlock(&device_list_mutex);
 352 }
 353
 354 static struct isert_device *
 355 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 356 {
 357         struct isert_device *device;
 358         int ret;
 359
 360         mutex_lock(&device_list_mutex);
 361         list_for_each_entry(device, &device_list, dev_node) {
 362                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 363                         device->refcount++;
 364                         mutex_unlock(&device_list_mutex);
 365                         return device;
 366                 }
 367         }
 368
 369         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 370         if (!device) {
 371                 mutex_unlock(&device_list_mutex);
 372                 return ERR_PTR(-ENOMEM);
 373         }
 374
 375         INIT_LIST_HEAD(&device->dev_node);
 376
 377         device->ib_device = cma_id->device;
 378         ret = isert_create_device_ib_res(device);
 379         if (ret) {
 380                 kfree(device);
 381                 mutex_unlock(&device_list_mutex);
 382                 return ERR_PTR(ret);
 383         }
 384
 385         device->refcount++;
 386         list_add_tail(&device->dev_node, &device_list);
 387         mutex_unlock(&device_list_mutex);
 388
 389         return device;
 390 }
 391
 392 static void
 393 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 394 {
 395         struct fast_reg_descriptor *fr_desc, *tmp;
 396         int i = 0;
 397
 398         if (list_empty(&isert_conn->conn_fr_pool))
 399                 return;
 400
 401         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 402
 403         list_for_each_entry_safe(fr_desc, tmp,
 404                                  &isert_conn->conn_fr_pool, list) {
 405                 list_del(&fr_desc->list);
 406                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 407                 ib_dereg_mr(fr_desc->data_mr);
 408                 if (fr_desc->pi_ctx) {
 409                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 410                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 411                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 412                         kfree(fr_desc->pi_ctx);
 413                 }
 414                 kfree(fr_desc);
 415                 ++i;
 416         }
 417
 418         if (i < isert_conn->conn_fr_pool_size)
 419                 pr_warn("Pool still has %d regions registered\n",
 420                         isert_conn->conn_fr_pool_size - i);
 421 }
 422
 423 static int
 424 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 425                      struct fast_reg_descriptor *fr_desc, u8 protection)
 426 {
 427         int ret;
 428
 429         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 430                                                          ISCSI_ISER_SG_TABLESIZE);
 431         if (IS_ERR(fr_desc->data_frpl)) {
 432                 pr_err("Failed to allocate data frpl err=%ld\n",
 433                        PTR_ERR(fr_desc->data_frpl));
 434                 return PTR_ERR(fr_desc->data_frpl);
 435         }
 436
 437         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 438         if (IS_ERR(fr_desc->data_mr)) {
 439                 pr_err("Failed to allocate data frmr err=%ld\n",
 440                        PTR_ERR(fr_desc->data_mr));
 441                 ret = PTR_ERR(fr_desc->data_mr);
 442                 goto err_data_frpl;
 443         }
 444         pr_debug("Create fr_desc %p page_list %p\n",
 445                  fr_desc, fr_desc->data_frpl->page_list);
 446         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 447
 448         if (protection) {
 449                 struct ib_mr_init_attr mr_init_attr = {0};
 450                 struct pi_context *pi_ctx;
 451
 452                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 453                 if (!fr_desc->pi_ctx) {
 454                         pr_err("Failed to allocate pi context\n");
 455                         ret = -ENOMEM;
 456                         goto err_data_mr;
 457                 }
 458                 pi_ctx = fr_desc->pi_ctx;
 459
 460                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 461                                                     ISCSI_ISER_SG_TABLESIZE);
 462                 if (IS_ERR(pi_ctx->prot_frpl)) {
 463                         pr_err("Failed to allocate prot frpl err=%ld\n",
 464                                PTR_ERR(pi_ctx->prot_frpl));
 465                         ret = PTR_ERR(pi_ctx->prot_frpl);
 466                         goto err_pi_ctx;
 467                 }
 468
 469                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 470                 if (IS_ERR(pi_ctx->prot_mr)) {
 471                         pr_err("Failed to allocate prot frmr err=%ld\n",
 472                                PTR_ERR(pi_ctx->prot_mr));
 473                         ret = PTR_ERR(pi_ctx->prot_mr);
 474                         goto err_prot_frpl;
 475                 }
 476                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 477
 478                 mr_init_attr.max_reg_descriptors = 2;
 479                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 480                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 481                 if (IS_ERR(pi_ctx->sig_mr)) {
 482                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 483                                PTR_ERR(pi_ctx->sig_mr));
 484                         ret = PTR_ERR(pi_ctx->sig_mr);
 485                         goto err_prot_mr;
 486                 }
 487                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 488         }
 489         fr_desc->ind &= ~ISERT_PROTECTED;
 490
 491         return 0;
 492 err_prot_mr:
 493         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 494 err_prot_frpl:
 495         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 496 err_pi_ctx:
 497         kfree(fr_desc->pi_ctx);
 498 err_data_mr:
 499         ib_dereg_mr(fr_desc->data_mr);
 500 err_data_frpl:
 501         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 502
 503         return ret;
 504 }
 505
 506 static int
 507 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 508 {
 509         struct fast_reg_descriptor *fr_desc;
 510         struct isert_device *device = isert_conn->conn_device;
 511         int i, ret;
 512
 513         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 514         isert_conn->conn_fr_pool_size = 0;
 515         for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
 516                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 517                 if (!fr_desc) {
 518                         pr_err("Failed to allocate fast_reg descriptor\n");
 519                         ret = -ENOMEM;
 520                         goto err;
 521                 }
 522
 523                 ret = isert_create_fr_desc(device->ib_device,
 524                                            isert_conn->conn_pd, fr_desc,
 525                                            pi_support);
 526                 if (ret) {
 527                         pr_err("Failed to create fastreg descriptor err=%d\n",
 528                                ret);
 529                         kfree(fr_desc);
 530                         goto err;
 531                 }
 532
 533                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 534                 isert_conn->conn_fr_pool_size++;
 535         }
 536
 537         pr_debug("Creating conn %p fastreg pool size=%d",
 538                  isert_conn, isert_conn->conn_fr_pool_size);
 539
 540         return 0;
 541
 542 err:
 543         isert_conn_free_fastreg_pool(isert_conn);
 544         return ret;
 545 }
 546
 547 static int
 548 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 549 {
 550         struct iscsi_np *np = cma_id->context;
 551         struct isert_np *isert_np = np->np_context;
 552         struct isert_conn *isert_conn;
 553         struct isert_device *device;
 554         struct ib_device *ib_dev = cma_id->device;
 555         int ret = 0;
 556         u8 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 557
 558         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 559                  cma_id, cma_id->context);
 560
 561         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 562         if (!isert_conn) {
 563                 pr_err("Unable to allocate isert_conn\n");
 564                 return -ENOMEM;
 565         }
 566         isert_conn->state = ISER_CONN_INIT;
 567         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 568         init_completion(&isert_conn->conn_login_comp);
 569         init_completion(&isert_conn->conn_wait);
 570         init_completion(&isert_conn->conn_wait_comp_err);
 571         kref_init(&isert_conn->conn_kref);
 572         kref_get(&isert_conn->conn_kref);
 573         mutex_init(&isert_conn->conn_mutex);
 574         spin_lock_init(&isert_conn->conn_lock);
 575
 576         cma_id->context = isert_conn;
 577         isert_conn->conn_cm_id = cma_id;
 578         isert_conn->responder_resources = event->param.conn.responder_resources;
 579         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 580         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 581                  isert_conn->responder_resources, isert_conn->initiator_depth);
 582
 583         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 584                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 585         if (!isert_conn->login_buf) {
 586                 pr_err("Unable to allocate isert_conn->login_buf\n");
 587                 ret = -ENOMEM;
 588                 goto out;
 589         }
 590
 591         isert_conn->login_req_buf = isert_conn->login_buf;
 592         isert_conn->login_rsp_buf = isert_conn->login_buf +
 593                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 594         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 595                  isert_conn->login_buf, isert_conn->login_req_buf,
 596                  isert_conn->login_rsp_buf);
 597
 598         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 599                                 (void *)isert_conn->login_req_buf,
 600                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 601
 602         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 603         if (ret) {
 604                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 605                        ret);
 606                 isert_conn->login_req_dma = 0;
 607                 goto out_login_buf;
 608         }
 609
 610         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 611                                         (void *)isert_conn->login_rsp_buf,
 612                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 613
 614         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 615         if (ret) {
 616                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 617                        ret);
 618                 isert_conn->login_rsp_dma = 0;
 619                 goto out_req_dma_map;
 620         }
 621
 622         device = isert_device_find_by_ib_dev(cma_id);
 623         if (IS_ERR(device)) {
 624                 ret = PTR_ERR(device);
 625                 goto out_rsp_dma_map;
 626         }
 627
 628         isert_conn->conn_device = device;
 629         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 630         if (IS_ERR(isert_conn->conn_pd)) {
 631                 ret = PTR_ERR(isert_conn->conn_pd);
 632                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 633                        isert_conn, ret);
 634                 goto out_pd;
 635         }
 636
 637         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 638                                            IB_ACCESS_LOCAL_WRITE);
 639         if (IS_ERR(isert_conn->conn_mr)) {
 640                 ret = PTR_ERR(isert_conn->conn_mr);
 641                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 642                        isert_conn, ret);
 643                 goto out_mr;
 644         }
 645
 646         if (pi_support && !device->pi_capable) {
 647                 pr_err("Protection information requested but not supported\n");
 648                 ret = -EINVAL;
 649                 goto out_mr;
 650         }
 651
 652         if (device->use_fastreg) {
 653                 ret = isert_conn_create_fastreg_pool(isert_conn, pi_support);
 654                 if (ret) {
 655                         pr_err("Conn: %p failed to create fastreg pool\n",
 656                                isert_conn);
 657                         goto out_fastreg;
 658                 }
 659         }
 660
 661         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 662         if (ret)
 663                 goto out_conn_dev;
 664
 665         mutex_lock(&isert_np->np_accept_mutex);
 666         list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
 667         mutex_unlock(&isert_np->np_accept_mutex);
 668
 669         pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
 670         wake_up(&isert_np->np_accept_wq);
 671         return 0;
 672
 673 out_conn_dev:
 674         if (device->use_fastreg)
 675                 isert_conn_free_fastreg_pool(isert_conn);
 676 out_fastreg:
 677         ib_dereg_mr(isert_conn->conn_mr);
 678 out_mr:
 679         ib_dealloc_pd(isert_conn->conn_pd);
 680 out_pd:
 681         isert_device_try_release(device);
 682 out_rsp_dma_map:
 683         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 684                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 685 out_req_dma_map:
 686         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 687                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 688 out_login_buf:
 689         kfree(isert_conn->login_buf);
 690 out:
 691         kfree(isert_conn);
 692         return ret;
 693 }
 694
 695 static void
 696 isert_connect_release(struct isert_conn *isert_conn)
 697 {
 698         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 699         struct isert_device *device = isert_conn->conn_device;
 700         int cq_index;
 701
 702         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 703
 704         if (device && device->use_fastreg)
 705                 isert_conn_free_fastreg_pool(isert_conn);
 706
 707         if (isert_conn->conn_qp) {
 708                 cq_index = ((struct isert_cq_desc *)
 709                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 710                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 711                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 712
 713                 rdma_destroy_qp(isert_conn->conn_cm_id);
 714         }
 715
 716         isert_free_rx_descriptors(isert_conn);
 717         rdma_destroy_id(isert_conn->conn_cm_id);
 718
 719         ib_dereg_mr(isert_conn->conn_mr);
 720         ib_dealloc_pd(isert_conn->conn_pd);
 721
 722         if (isert_conn->login_buf) {
 723                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 724                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 725                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 726                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 727                                     DMA_FROM_DEVICE);
 728                 kfree(isert_conn->login_buf);
 729         }
 730         kfree(isert_conn);
 731
 732         if (device)
 733                 isert_device_try_release(device);
 734
 735         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 736 }
 737
 738 static void
 739 isert_connected_handler(struct rdma_cm_id *cma_id)
 740 {
 741         return;
 742 }
 743
 744 static void
 745 isert_release_conn_kref(struct kref *kref)
 746 {
 747         struct isert_conn *isert_conn = container_of(kref,
 748                                 struct isert_conn, conn_kref);
 749
 750         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 751                  current->comm, current->pid);
 752
 753         isert_connect_release(isert_conn);
 754 }
 755
 756 static void
 757 isert_put_conn(struct isert_conn *isert_conn)
 758 {
 759         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 760 }
 761
 762 static void
 763 isert_disconnect_work(struct work_struct *work)
 764 {
 765         struct isert_conn *isert_conn = container_of(work,
 766                                 struct isert_conn, conn_logout_work);
 767
 768         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 769         mutex_lock(&isert_conn->conn_mutex);
 770         if (isert_conn->state == ISER_CONN_UP)
 771                 isert_conn->state = ISER_CONN_TERMINATING;
 772
 773         if (isert_conn->post_recv_buf_count == 0 &&
 774             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 775                 mutex_unlock(&isert_conn->conn_mutex);
 776                 goto wake_up;
 777         }
 778         if (!isert_conn->conn_cm_id) {
 779                 mutex_unlock(&isert_conn->conn_mutex);
 780                 isert_put_conn(isert_conn);
 781                 return;
 782         }
 783         if (!isert_conn->logout_posted) {
 784                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 785                          " isert_disconnect_work\n");
 786                 rdma_disconnect(isert_conn->conn_cm_id);
 787                 mutex_unlock(&isert_conn->conn_mutex);
 788                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 789                 goto wake_up;
 790         }
 791         mutex_unlock(&isert_conn->conn_mutex);
 792
 793 wake_up:
 794         complete(&isert_conn->conn_wait);
 795         isert_put_conn(isert_conn);
 796 }
 797
 798 static void
 799 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 800 {
 801         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 802
 803         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 804         schedule_work(&isert_conn->conn_logout_work);
 805 }
 806
 807 static int
 808 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 809 {
 810         int ret = 0;
 811
 812         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 813                  event->event, event->status, cma_id->context, cma_id);
 814
 815         switch (event->event) {
 816         case RDMA_CM_EVENT_CONNECT_REQUEST:
 817                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 818                 ret = isert_connect_request(cma_id, event);
 819                 break;
 820         case RDMA_CM_EVENT_ESTABLISHED:
 821                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 822                 isert_connected_handler(cma_id);
 823                 break;
 824         case RDMA_CM_EVENT_DISCONNECTED:
 825                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 826                 isert_disconnected_handler(cma_id);
 827                 break;
 828         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 829         case RDMA_CM_EVENT_ADDR_CHANGE:
 830                 break;
 831         case RDMA_CM_EVENT_CONNECT_ERROR:
 832         default:
 833                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 834                 break;
 835         }
 836
 837         if (ret != 0) {
 838                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 839                        event->event, ret);
 840                 dump_stack();
 841         }
 842
 843         return ret;
 844 }
 845
 846 static int
 847 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 848 {
 849         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 850         int i, ret;
 851         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 852         struct iser_rx_desc *rx_desc;
 853
 854         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 855                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 856                 rx_wr->wr_id    = (unsigned long)rx_desc;
 857                 rx_wr->sg_list  = &rx_desc->rx_sg;
 858                 rx_wr->num_sge  = 1;
 859                 rx_wr->next     = rx_wr + 1;
 860                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 861         }
 862
 863         rx_wr--;
 864         rx_wr->next = NULL; /* mark end of work requests list */
 865
 866         isert_conn->post_recv_buf_count += count;
 867         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 868                                 &rx_wr_failed);
 869         if (ret) {
 870                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 871                 isert_conn->post_recv_buf_count -= count;
 872         } else {
 873                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 874                 isert_conn->conn_rx_desc_head = rx_head;
 875         }
 876         return ret;
 877 }
 878
 879 static int
 880 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 881 {
 882         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 883         struct ib_send_wr send_wr, *send_wr_failed;
 884         int ret;
 885
 886         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 887                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 888
 889         send_wr.next    = NULL;
 890         send_wr.wr_id   = (unsigned long)tx_desc;
 891         send_wr.sg_list = tx_desc->tx_sg;
 892         send_wr.num_sge = tx_desc->num_sge;
 893         send_wr.opcode  = IB_WR_SEND;
 894         send_wr.send_flags = IB_SEND_SIGNALED;
 895
 896         atomic_inc(&isert_conn->post_send_buf_count);
 897
 898         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 899         if (ret) {
 900                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 901                 atomic_dec(&isert_conn->post_send_buf_count);
 902         }
 903
 904         return ret;
 905 }
 906
 907 static void
 908 isert_create_send_desc(struct isert_conn *isert_conn,
 909                        struct isert_cmd *isert_cmd,
 910                        struct iser_tx_desc *tx_desc)
 911 {
 912         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 913
 914         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 915                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 916
 917         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 918         tx_desc->iser_header.flags = ISER_VER;
 919
 920         tx_desc->num_sge = 1;
 921         tx_desc->isert_cmd = isert_cmd;
 922
 923         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 924                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 925                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 926         }
 927 }
 928
 929 static int
 930 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 931                    struct iser_tx_desc *tx_desc)
 932 {
 933         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 934         u64 dma_addr;
 935
 936         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 937                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 938         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 939                 pr_err("ib_dma_mapping_error() failed\n");
 940                 return -ENOMEM;
 941         }
 942
 943         tx_desc->dma_addr = dma_addr;
 944         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 945         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 946         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 947
 948         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 949                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 950                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 951
 952         return 0;
 953 }
 954
 955 static void
 956 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 957                    struct ib_send_wr *send_wr, bool coalesce)
 958 {
 959         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 960
 961         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 962         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 963         send_wr->opcode = IB_WR_SEND;
 964         send_wr->sg_list = &tx_desc->tx_sg[0];
 965         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 966         /*
 967          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 968          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 969          */
 970         mutex_lock(&isert_conn->conn_mutex);
 971         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 972             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 973                 tx_desc->llnode_active = true;
 974                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 975                 mutex_unlock(&isert_conn->conn_mutex);
 976                 return;
 977         }
 978         isert_conn->conn_comp_batch = 0;
 979         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 980         mutex_unlock(&isert_conn->conn_mutex);
 981
 982         send_wr->send_flags = IB_SEND_SIGNALED;
 983 }
 984
 985 static int
 986 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 987 {
 988         struct ib_recv_wr rx_wr, *rx_wr_fail;
 989         struct ib_sge sge;
 990         int ret;
 991
 992         memset(&sge, 0, sizeof(struct ib_sge));
 993         sge.addr = isert_conn->login_req_dma;
 994         sge.length = ISER_RX_LOGIN_SIZE;
 995         sge.lkey = isert_conn->conn_mr->lkey;
 996
 997         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 998                 sge.addr, sge.length, sge.lkey);
 999
1000         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1001         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1002         rx_wr.sg_list = &sge;
1003         rx_wr.num_sge = 1;
1004
1005         isert_conn->post_recv_buf_count++;
1006         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1007         if (ret) {
1008                 pr_err("ib_post_recv() failed: %d\n", ret);
1009                 isert_conn->post_recv_buf_count--;
1010         }
1011
1012         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1013         return ret;
1014 }
1015
1016 static int
1017 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1018                    u32 length)
1019 {
1020         struct isert_conn *isert_conn = conn->context;
1021         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1022         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1023         int ret;
1024
1025         isert_create_send_desc(isert_conn, NULL, tx_desc);
1026
1027         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1028                sizeof(struct iscsi_hdr));
1029
1030         isert_init_tx_hdrs(isert_conn, tx_desc);
1031
1032         if (length > 0) {
1033                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1034
1035                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1036                                            length, DMA_TO_DEVICE);
1037
1038                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1039
1040                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1041                                               length, DMA_TO_DEVICE);
1042
1043                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1044                 tx_dsg->length  = length;
1045                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1046                 tx_desc->num_sge = 2;
1047         }
1048         if (!login->login_failed) {
1049                 if (login->login_complete) {
1050                         ret = isert_alloc_rx_descriptors(isert_conn);
1051                         if (ret)
1052                                 return ret;
1053
1054                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1055                         if (ret)
1056                                 return ret;
1057
1058                         isert_conn->state = ISER_CONN_UP;
1059                         goto post_send;
1060                 }
1061
1062                 ret = isert_rdma_post_recvl(isert_conn);
1063                 if (ret)
1064                         return ret;
1065         }
1066 post_send:
1067         ret = isert_post_send(isert_conn, tx_desc);
1068         if (ret)
1069                 return ret;
1070
1071         return 0;
1072 }
1073
1074 static void
1075 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1076                    struct isert_conn *isert_conn)
1077 {
1078         struct iscsi_conn *conn = isert_conn->conn;
1079         struct iscsi_login *login = conn->conn_login;
1080         int size;
1081
1082         if (!login) {
1083                 pr_err("conn->conn_login is NULL\n");
1084                 dump_stack();
1085                 return;
1086         }
1087
1088         if (login->first_request) {
1089                 struct iscsi_login_req *login_req =
1090                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1091                 /*
1092                  * Setup the initial iscsi_login values from the leading
1093                  * login request PDU.
1094                  */
1095                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1096                 login->current_stage =
1097                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1098                          >> 2;
1099                 login->version_min      = login_req->min_version;
1100                 login->version_max      = login_req->max_version;
1101                 memcpy(login->isid, login_req->isid, 6);
1102                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1103                 login->init_task_tag    = login_req->itt;
1104                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1105                 login->cid              = be16_to_cpu(login_req->cid);
1106                 login->tsih             = be16_to_cpu(login_req->tsih);
1107         }
1108
1109         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1110
1111         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1112         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1113                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1114         memcpy(login->req_buf, &rx_desc->data[0], size);
1115
1116         if (login->first_request) {
1117                 complete(&isert_conn->conn_login_comp);
1118                 return;
1119         }
1120         schedule_delayed_work(&conn->login_work, 0);
1121 }
1122
1123 static struct iscsi_cmd
1124 *isert_allocate_cmd(struct iscsi_conn *conn)
1125 {
1126         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1127         struct isert_cmd *isert_cmd;
1128         struct iscsi_cmd *cmd;
1129
1130         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1131         if (!cmd) {
1132                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1133                 return NULL;
1134         }
1135         isert_cmd = iscsit_priv_cmd(cmd);
1136         isert_cmd->conn = isert_conn;
1137         isert_cmd->iscsi_cmd = cmd;
1138
1139         return cmd;
1140 }
1141
1142 static int
1143 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1144                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1145                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1146 {
1147         struct iscsi_conn *conn = isert_conn->conn;
1148         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1149         struct scatterlist *sg;
1150         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1151         bool dump_payload = false;
1152
1153         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1154         if (rc < 0)
1155                 return rc;
1156
1157         imm_data = cmd->immediate_data;
1158         imm_data_len = cmd->first_burst_len;
1159         unsol_data = cmd->unsolicited_data;
1160
1161         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1162         if (rc < 0) {
1163                 return 0;
1164         } else if (rc > 0) {
1165                 dump_payload = true;
1166                 goto sequence_cmd;
1167         }
1168
1169         if (!imm_data)
1170                 return 0;
1171
1172         sg = &cmd->se_cmd.t_data_sg[0];
1173         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1174
1175         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1176                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1177
1178         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1179
1180         cmd->write_data_done += imm_data_len;
1181
1182         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1183                 spin_lock_bh(&cmd->istate_lock);
1184                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1185                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1186                 spin_unlock_bh(&cmd->istate_lock);
1187         }
1188
1189 sequence_cmd:
1190         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1191
1192         if (!rc && dump_payload == false && unsol_data)
1193                 iscsit_set_unsoliticed_dataout(cmd);
1194
1195         return 0;
1196 }
1197
1198 static int
1199 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1200                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1201 {
1202         struct scatterlist *sg_start;
1203         struct iscsi_conn *conn = isert_conn->conn;
1204         struct iscsi_cmd *cmd = NULL;
1205         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1206         u32 unsol_data_len = ntoh24(hdr->dlength);
1207         int rc, sg_nents, sg_off, page_off;
1208
1209         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1210         if (rc < 0)
1211                 return rc;
1212         else if (!cmd)
1213                 return 0;
1214         /*
1215          * FIXME: Unexpected unsolicited_data out
1216          */
1217         if (!cmd->unsolicited_data) {
1218                 pr_err("Received unexpected solicited data payload\n");
1219                 dump_stack();
1220                 return -1;
1221         }
1222
1223         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1224                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1225
1226         sg_off = cmd->write_data_done / PAGE_SIZE;
1227         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1228         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1229         page_off = cmd->write_data_done % PAGE_SIZE;
1230         /*
1231          * FIXME: Non page-aligned unsolicited_data out
1232          */
1233         if (page_off) {
1234                 pr_err("Received unexpected non-page aligned data payload\n");
1235                 dump_stack();
1236                 return -1;
1237         }
1238         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1239                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1240
1241         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1242                             unsol_data_len);
1243
1244         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1245         if (rc < 0)
1246                 return rc;
1247
1248         return 0;
1249 }
1250
1251 static int
1252 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1253                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1254                      unsigned char *buf)
1255 {
1256         struct iscsi_conn *conn = isert_conn->conn;
1257         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1258         int rc;
1259
1260         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1261         if (rc < 0)
1262                 return rc;
1263         /*
1264          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1265          */
1266
1267         return iscsit_process_nop_out(conn, cmd, hdr);
1268 }
1269
1270 static int
1271 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1272                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1273                       struct iscsi_text *hdr)
1274 {
1275         struct iscsi_conn *conn = isert_conn->conn;
1276         u32 payload_length = ntoh24(hdr->dlength);
1277         int rc;
1278         unsigned char *text_in;
1279
1280         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1281         if (rc < 0)
1282                 return rc;
1283
1284         text_in = kzalloc(payload_length, GFP_KERNEL);
1285         if (!text_in) {
1286                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1287                        payload_length);
1288                 return -ENOMEM;
1289         }
1290         cmd->text_in_ptr = text_in;
1291
1292         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1293
1294         return iscsit_process_text_cmd(conn, cmd, hdr);
1295 }
1296
1297 static int
1298 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1299                 uint32_t read_stag, uint64_t read_va,
1300                 uint32_t write_stag, uint64_t write_va)
1301 {
1302         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1303         struct iscsi_conn *conn = isert_conn->conn;
1304         struct iscsi_session *sess = conn->sess;
1305         struct iscsi_cmd *cmd;
1306         struct isert_cmd *isert_cmd;
1307         int ret = -EINVAL;
1308         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1309
1310         if (sess->sess_ops->SessionType &&
1311            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1312                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1313                        " ignoring\n", opcode);
1314                 return 0;
1315         }
1316
1317         switch (opcode) {
1318         case ISCSI_OP_SCSI_CMD:
1319                 cmd = isert_allocate_cmd(conn);
1320                 if (!cmd)
1321                         break;
1322
1323                 isert_cmd = iscsit_priv_cmd(cmd);
1324                 isert_cmd->read_stag = read_stag;
1325                 isert_cmd->read_va = read_va;
1326                 isert_cmd->write_stag = write_stag;
1327                 isert_cmd->write_va = write_va;
1328
1329                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1330                                         rx_desc, (unsigned char *)hdr);
1331                 break;
1332         case ISCSI_OP_NOOP_OUT:
1333                 cmd = isert_allocate_cmd(conn);
1334                 if (!cmd)
1335                         break;
1336
1337                 isert_cmd = iscsit_priv_cmd(cmd);
1338                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1339                                            rx_desc, (unsigned char *)hdr);
1340                 break;
1341         case ISCSI_OP_SCSI_DATA_OUT:
1342                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1343                                                 (unsigned char *)hdr);
1344                 break;
1345         case ISCSI_OP_SCSI_TMFUNC:
1346                 cmd = isert_allocate_cmd(conn);
1347                 if (!cmd)
1348                         break;
1349
1350                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1351                                                 (unsigned char *)hdr);
1352                 break;
1353         case ISCSI_OP_LOGOUT:
1354                 cmd = isert_allocate_cmd(conn);
1355                 if (!cmd)
1356                         break;
1357
1358                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1359                 if (ret > 0)
1360                         wait_for_completion_timeout(&conn->conn_logout_comp,
1361                                                     SECONDS_FOR_LOGOUT_COMP *
1362                                                     HZ);
1363                 break;
1364         case ISCSI_OP_TEXT:
1365                 cmd = isert_allocate_cmd(conn);
1366                 if (!cmd)
1367                         break;
1368
1369                 isert_cmd = iscsit_priv_cmd(cmd);
1370                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1371                                             rx_desc, (struct iscsi_text *)hdr);
1372                 break;
1373         default:
1374                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1375                 dump_stack();
1376                 break;
1377         }
1378
1379         return ret;
1380 }
1381
1382 static void
1383 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1384 {
1385         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1386         uint64_t read_va = 0, write_va = 0;
1387         uint32_t read_stag = 0, write_stag = 0;
1388         int rc;
1389
1390         switch (iser_hdr->flags & 0xF0) {
1391         case ISCSI_CTRL:
1392                 if (iser_hdr->flags & ISER_RSV) {
1393                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1394                         read_va = be64_to_cpu(iser_hdr->read_va);
1395                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1396                                  read_stag, (unsigned long long)read_va);
1397                 }
1398                 if (iser_hdr->flags & ISER_WSV) {
1399                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1400                         write_va = be64_to_cpu(iser_hdr->write_va);
1401                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1402                                  write_stag, (unsigned long long)write_va);
1403                 }
1404
1405                 pr_debug("ISER ISCSI_CTRL PDU\n");
1406                 break;
1407         case ISER_HELLO:
1408                 pr_err("iSER Hello message\n");
1409                 break;
1410         default:
1411                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1412                 break;
1413         }
1414
1415         rc = isert_rx_opcode(isert_conn, rx_desc,
1416                              read_stag, read_va, write_stag, write_va);
1417 }
1418
1419 static void
1420 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1421                     unsigned long xfer_len)
1422 {
1423         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1424         struct iscsi_hdr *hdr;
1425         u64 rx_dma;
1426         int rx_buflen, outstanding;
1427
1428         if ((char *)desc == isert_conn->login_req_buf) {
1429                 rx_dma = isert_conn->login_req_dma;
1430                 rx_buflen = ISER_RX_LOGIN_SIZE;
1431                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1432                          rx_dma, rx_buflen);
1433         } else {
1434                 rx_dma = desc->dma_addr;
1435                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1436                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1437                          rx_dma, rx_buflen);
1438         }
1439
1440         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1441
1442         hdr = &desc->iscsi_header;
1443         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1444                  hdr->opcode, hdr->itt, hdr->flags,
1445                  (int)(xfer_len - ISER_HEADERS_LEN));
1446
1447         if ((char *)desc == isert_conn->login_req_buf)
1448                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1449                                    isert_conn);
1450         else
1451                 isert_rx_do_work(desc, isert_conn);
1452
1453         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1454                                       DMA_FROM_DEVICE);
1455
1456         isert_conn->post_recv_buf_count--;
1457         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1458                  isert_conn->post_recv_buf_count);
1459
1460         if ((char *)desc == isert_conn->login_req_buf)
1461                 return;
1462
1463         outstanding = isert_conn->post_recv_buf_count;
1464         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1465                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1466                                 ISERT_MIN_POSTED_RX);
1467                 err = isert_post_recv(isert_conn, count);
1468                 if (err) {
1469                         pr_err("isert_post_recv() count: %d failed, %d\n",
1470                                count, err);
1471                 }
1472         }
1473 }
1474
1475 static int
1476 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1477                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1478                    enum iser_ib_op_code op, struct isert_data_buf *data)
1479 {
1480         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1481
1482         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1483                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1484
1485         data->len = length - offset;
1486         data->offset = offset;
1487         data->sg_off = data->offset / PAGE_SIZE;
1488
1489         data->sg = &sg[data->sg_off];
1490         data->nents = min_t(unsigned int, nents - data->sg_off,
1491                                           ISCSI_ISER_SG_TABLESIZE);
1492         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1493                                         PAGE_SIZE);
1494
1495         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1496                                         data->dma_dir);
1497         if (unlikely(!data->dma_nents)) {
1498                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1499                 return -EINVAL;
1500         }
1501
1502         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1503                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1504
1505         return 0;
1506 }
1507
1508 static void
1509 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1510 {
1511         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1512
1513         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1514         memset(data, 0, sizeof(*data));
1515 }
1516
1517
1518
1519 static void
1520 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1521 {
1522         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1523
1524         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1525
1526         if (wr->data.sg) {
1527                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1528                 isert_unmap_data_buf(isert_conn, &wr->data);
1529         }
1530
1531         if (wr->send_wr) {
1532                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1533                 kfree(wr->send_wr);
1534                 wr->send_wr = NULL;
1535         }
1536
1537         if (wr->ib_sge) {
1538                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1539                 kfree(wr->ib_sge);
1540                 wr->ib_sge = NULL;
1541         }
1542 }
1543
1544 static void
1545 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1546 {
1547         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1548         LIST_HEAD(unmap_list);
1549
1550         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1551
1552         if (wr->fr_desc) {
1553                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1554                          isert_cmd, wr->fr_desc);
1555                 spin_lock_bh(&isert_conn->conn_lock);
1556                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1557                 spin_unlock_bh(&isert_conn->conn_lock);
1558                 wr->fr_desc = NULL;
1559         }
1560
1561         if (wr->data.sg) {
1562                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1563                 isert_unmap_data_buf(isert_conn, &wr->data);
1564         }
1565
1566         wr->ib_sge = NULL;
1567         wr->send_wr = NULL;
1568 }
1569
1570 static void
1571 isert_put_cmd(struct isert_cmd *isert_cmd)
1572 {
1573         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1574         struct isert_conn *isert_conn = isert_cmd->conn;
1575         struct iscsi_conn *conn = isert_conn->conn;
1576         struct isert_device *device = isert_conn->conn_device;
1577
1578         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1579
1580         switch (cmd->iscsi_opcode) {
1581         case ISCSI_OP_SCSI_CMD:
1582                 spin_lock_bh(&conn->cmd_lock);
1583                 if (!list_empty(&cmd->i_conn_node))
1584                         list_del_init(&cmd->i_conn_node);
1585                 spin_unlock_bh(&conn->cmd_lock);
1586
1587                 if (cmd->data_direction == DMA_TO_DEVICE)
1588                         iscsit_stop_dataout_timer(cmd);
1589
1590                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1591                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1592                 break;
1593         case ISCSI_OP_SCSI_TMFUNC:
1594                 spin_lock_bh(&conn->cmd_lock);
1595                 if (!list_empty(&cmd->i_conn_node))
1596                         list_del_init(&cmd->i_conn_node);
1597                 spin_unlock_bh(&conn->cmd_lock);
1598
1599                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1600                 break;
1601         case ISCSI_OP_REJECT:
1602         case ISCSI_OP_NOOP_OUT:
1603         case ISCSI_OP_TEXT:
1604                 spin_lock_bh(&conn->cmd_lock);
1605                 if (!list_empty(&cmd->i_conn_node))
1606                         list_del_init(&cmd->i_conn_node);
1607                 spin_unlock_bh(&conn->cmd_lock);
1608
1609                 /*
1610                  * Handle special case for REJECT when iscsi_add_reject*() has
1611                  * overwritten the original iscsi_opcode assignment, and the
1612                  * associated cmd->se_cmd needs to be released.
1613                  */
1614                 if (cmd->se_cmd.se_tfo != NULL) {
1615                         pr_debug("Calling transport_generic_free_cmd from"
1616                                  " isert_put_cmd for 0x%02x\n",
1617                                  cmd->iscsi_opcode);
1618                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1619                         break;
1620                 }
1621                 /*
1622                  * Fall-through
1623                  */
1624         default:
1625                 iscsit_release_cmd(cmd);
1626                 break;
1627         }
1628 }
1629
1630 static void
1631 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1632 {
1633         if (tx_desc->dma_addr != 0) {
1634                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1635                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1636                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1637                 tx_desc->dma_addr = 0;
1638         }
1639 }
1640
1641 static void
1642 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1643                      struct ib_device *ib_dev)
1644 {
1645         if (isert_cmd->pdu_buf_dma != 0) {
1646                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1647                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1648                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1649                 isert_cmd->pdu_buf_dma = 0;
1650         }
1651
1652         isert_unmap_tx_desc(tx_desc, ib_dev);
1653         isert_put_cmd(isert_cmd);
1654 }
1655
1656 static void
1657 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1658                             struct isert_cmd *isert_cmd)
1659 {
1660         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1661         struct isert_conn *isert_conn = isert_cmd->conn;
1662         struct isert_device *device = isert_conn->conn_device;
1663
1664         device->unreg_rdma_mem(isert_cmd, isert_conn);
1665         isert_put_response(isert_conn->conn, cmd);
1666 }
1667
1668 static void
1669 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1670                            struct isert_cmd *isert_cmd)
1671 {
1672         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1673         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1674         struct se_cmd *se_cmd = &cmd->se_cmd;
1675         struct isert_conn *isert_conn = isert_cmd->conn;
1676         struct isert_device *device = isert_conn->conn_device;
1677
1678         iscsit_stop_dataout_timer(cmd);
1679         device->unreg_rdma_mem(isert_cmd, isert_conn);
1680         cmd->write_data_done = wr->data.len;
1681         wr->send_wr_num = 0;
1682
1683         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1684         spin_lock_bh(&cmd->istate_lock);
1685         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1686         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1687         spin_unlock_bh(&cmd->istate_lock);
1688
1689         target_execute_cmd(se_cmd);
1690 }
1691
1692 static void
1693 isert_do_control_comp(struct work_struct *work)
1694 {
1695         struct isert_cmd *isert_cmd = container_of(work,
1696                         struct isert_cmd, comp_work);
1697         struct isert_conn *isert_conn = isert_cmd->conn;
1698         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1699         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1700
1701         switch (cmd->i_state) {
1702         case ISTATE_SEND_TASKMGTRSP:
1703                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1704
1705                 atomic_dec(&isert_conn->post_send_buf_count);
1706                 iscsit_tmr_post_handler(cmd, cmd->conn);
1707
1708                 cmd->i_state = ISTATE_SENT_STATUS;
1709                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1710                 break;
1711         case ISTATE_SEND_REJECT:
1712                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1713                 atomic_dec(&isert_conn->post_send_buf_count);
1714
1715                 cmd->i_state = ISTATE_SENT_STATUS;
1716                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1717                 break;
1718         case ISTATE_SEND_LOGOUTRSP:
1719                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1720                 /*
1721                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1722                  * from isert_wait_conn()
1723                  */
1724                 isert_conn->logout_posted = true;
1725                 iscsit_logout_post_handler(cmd, cmd->conn);
1726                 break;
1727         case ISTATE_SEND_TEXTRSP:
1728                 atomic_dec(&isert_conn->post_send_buf_count);
1729                 cmd->i_state = ISTATE_SENT_STATUS;
1730                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1731                 break;
1732         default:
1733                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1734                 dump_stack();
1735                 break;
1736         }
1737 }
1738
1739 static void
1740 isert_response_completion(struct iser_tx_desc *tx_desc,
1741                           struct isert_cmd *isert_cmd,
1742                           struct isert_conn *isert_conn,
1743                           struct ib_device *ib_dev)
1744 {
1745         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1746         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1747
1748         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1749             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1750             cmd->i_state == ISTATE_SEND_REJECT ||
1751             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1752                 isert_unmap_tx_desc(tx_desc, ib_dev);
1753
1754                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1755                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1756                 return;
1757         }
1758         atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1759
1760         cmd->i_state = ISTATE_SENT_STATUS;
1761         isert_completion_put(tx_desc, isert_cmd, ib_dev);
1762 }
1763
1764 static void
1765 __isert_send_completion(struct iser_tx_desc *tx_desc,
1766                         struct isert_conn *isert_conn)
1767 {
1768         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1769         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1770         struct isert_rdma_wr *wr;
1771
1772         if (!isert_cmd) {
1773                 atomic_dec(&isert_conn->post_send_buf_count);
1774                 isert_unmap_tx_desc(tx_desc, ib_dev);
1775                 return;
1776         }
1777         wr = &isert_cmd->rdma_wr;
1778
1779         switch (wr->iser_ib_op) {
1780         case ISER_IB_RECV:
1781                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1782                 dump_stack();
1783                 break;
1784         case ISER_IB_SEND:
1785                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1786                 isert_response_completion(tx_desc, isert_cmd,
1787                                           isert_conn, ib_dev);
1788                 break;
1789         case ISER_IB_RDMA_WRITE:
1790                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1791                 atomic_dec(&isert_conn->post_send_buf_count);
1792                 isert_completion_rdma_write(tx_desc, isert_cmd);
1793                 break;
1794         case ISER_IB_RDMA_READ:
1795                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1796
1797                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1798                 isert_completion_rdma_read(tx_desc, isert_cmd);
1799                 break;
1800         default:
1801                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1802                 dump_stack();
1803                 break;
1804         }
1805 }
1806
1807 static void
1808 isert_send_completion(struct iser_tx_desc *tx_desc,
1809                       struct isert_conn *isert_conn)
1810 {
1811         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1812         struct iser_tx_desc *t;
1813         /*
1814          * Drain coalesced completion llist starting from comp_llnode_batch
1815          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1816          */
1817         while (llnode) {
1818                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1819                 llnode = llist_next(llnode);
1820                 __isert_send_completion(t, isert_conn);
1821         }
1822         __isert_send_completion(tx_desc, isert_conn);
1823 }
1824
1825 static void
1826 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1827 {
1828         struct llist_node *llnode;
1829         struct isert_rdma_wr *wr;
1830         struct iser_tx_desc *t;
1831
1832         mutex_lock(&isert_conn->conn_mutex);
1833         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1834         isert_conn->conn_comp_batch = 0;
1835         mutex_unlock(&isert_conn->conn_mutex);
1836
1837         while (llnode) {
1838                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1839                 llnode = llist_next(llnode);
1840                 wr = &t->isert_cmd->rdma_wr;
1841
1842                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1843                 isert_completion_put(t, t->isert_cmd, ib_dev);
1844         }
1845 }
1846
1847 static void
1848 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1849 {
1850         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1851         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1852         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1853         struct isert_rdma_wr *wr;
1854         struct iser_tx_desc *t;
1855
1856         while (llnode) {
1857                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1858                 llnode = llist_next(llnode);
1859                 wr = &t->isert_cmd->rdma_wr;
1860
1861                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1862                 isert_completion_put(t, t->isert_cmd, ib_dev);
1863         }
1864         tx_desc->comp_llnode_batch = NULL;
1865
1866         if (!isert_cmd)
1867                 isert_unmap_tx_desc(tx_desc, ib_dev);
1868         else
1869                 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1870 }
1871
1872 static void
1873 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1874 {
1875         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1876         struct iscsi_conn *conn = isert_conn->conn;
1877
1878         if (isert_conn->post_recv_buf_count)
1879                 return;
1880
1881         isert_cq_drain_comp_llist(isert_conn, ib_dev);
1882
1883         if (conn->sess) {
1884                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1885                 target_wait_for_sess_cmds(conn->sess->se_sess);
1886         }
1887
1888         while (atomic_read(&isert_conn->post_send_buf_count))
1889                 msleep(3000);
1890
1891         mutex_lock(&isert_conn->conn_mutex);
1892         isert_conn->state = ISER_CONN_DOWN;
1893         mutex_unlock(&isert_conn->conn_mutex);
1894
1895         complete(&isert_conn->conn_wait_comp_err);
1896 }
1897
1898 static void
1899 isert_cq_tx_work(struct work_struct *work)
1900 {
1901         struct isert_cq_desc *cq_desc = container_of(work,
1902                                 struct isert_cq_desc, cq_tx_work);
1903         struct isert_device *device = cq_desc->device;
1904         int cq_index = cq_desc->cq_index;
1905         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1906         struct isert_conn *isert_conn;
1907         struct iser_tx_desc *tx_desc;
1908         struct ib_wc wc;
1909
1910         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1911                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1912                 isert_conn = wc.qp->qp_context;
1913
1914                 if (wc.status == IB_WC_SUCCESS) {
1915                         isert_send_completion(tx_desc, isert_conn);
1916                 } else {
1917                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1918                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
1919                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1920
1921                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
1922                                 if (tx_desc->llnode_active)
1923                                         continue;
1924
1925                                 atomic_dec(&isert_conn->post_send_buf_count);
1926                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
1927                         }
1928                 }
1929         }
1930
1931         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1932 }
1933
1934 static void
1935 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1936 {
1937         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1938
1939         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1940 }
1941
1942 static void
1943 isert_cq_rx_work(struct work_struct *work)
1944 {
1945         struct isert_cq_desc *cq_desc = container_of(work,
1946                         struct isert_cq_desc, cq_rx_work);
1947         struct isert_device *device = cq_desc->device;
1948         int cq_index = cq_desc->cq_index;
1949         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1950         struct isert_conn *isert_conn;
1951         struct iser_rx_desc *rx_desc;
1952         struct ib_wc wc;
1953         unsigned long xfer_len;
1954
1955         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1956                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1957                 isert_conn = wc.qp->qp_context;
1958
1959                 if (wc.status == IB_WC_SUCCESS) {
1960                         xfer_len = (unsigned long)wc.byte_len;
1961                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
1962                 } else {
1963                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1964                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
1965                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1966                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
1967                                          wc.vendor_err);
1968                         }
1969                         isert_conn->post_recv_buf_count--;
1970                         isert_cq_rx_comp_err(isert_conn);
1971                 }
1972         }
1973
1974         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1975 }
1976
1977 static void
1978 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1979 {
1980         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1981
1982         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1983 }
1984
1985 static int
1986 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1987 {
1988         struct ib_send_wr *wr_failed;
1989         int ret;
1990
1991         atomic_inc(&isert_conn->post_send_buf_count);
1992
1993         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1994                            &wr_failed);
1995         if (ret) {
1996                 pr_err("ib_post_send failed with %d\n", ret);
1997                 atomic_dec(&isert_conn->post_send_buf_count);
1998                 return ret;
1999         }
2000         return ret;
2001 }
2002
2003 static int
2004 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2005 {
2006         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2007         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2008         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2009         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2010                                 &isert_cmd->tx_desc.iscsi_header;
2011
2012         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2013         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2014         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2015         /*
2016          * Attach SENSE DATA payload to iSCSI Response PDU
2017          */
2018         if (cmd->se_cmd.sense_buffer &&
2019             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2020             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2021                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2022                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2023                 u32 padding, pdu_len;
2024
2025                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2026                                    cmd->sense_buffer);
2027                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2028
2029                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2030                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2031                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2032
2033                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2034                                 (void *)cmd->sense_buffer, pdu_len,
2035                                 DMA_TO_DEVICE);
2036
2037                 isert_cmd->pdu_buf_len = pdu_len;
2038                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2039                 tx_dsg->length  = pdu_len;
2040                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2041                 isert_cmd->tx_desc.num_sge = 2;
2042         }
2043
2044         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2045
2046         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2047
2048         return isert_post_response(isert_conn, isert_cmd);
2049 }
2050
2051 static int
2052 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2053                 bool nopout_response)
2054 {
2055         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2056         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2057         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2058
2059         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2060         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2061                                &isert_cmd->tx_desc.iscsi_header,
2062                                nopout_response);
2063         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2064         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2065
2066         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2067
2068         return isert_post_response(isert_conn, isert_cmd);
2069 }
2070
2071 static int
2072 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2073 {
2074         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2075         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2076         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2077
2078         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2079         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2080                                 &isert_cmd->tx_desc.iscsi_header);
2081         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2082         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2083
2084         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2085
2086         return isert_post_response(isert_conn, isert_cmd);
2087 }
2088
2089 static int
2090 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2091 {
2092         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2093         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2094         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2095
2096         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2097         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2098                                   &isert_cmd->tx_desc.iscsi_header);
2099         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2100         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2101
2102         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2103
2104         return isert_post_response(isert_conn, isert_cmd);
2105 }
2106
2107 static int
2108 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2109 {
2110         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2111         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2112         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2113         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2114         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2115         struct iscsi_reject *hdr =
2116                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2117
2118         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2119         iscsit_build_reject(cmd, conn, hdr);
2120         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2121
2122         hton24(hdr->dlength, ISCSI_HDR_LEN);
2123         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2124                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2125                         DMA_TO_DEVICE);
2126         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2127         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2128         tx_dsg->length  = ISCSI_HDR_LEN;
2129         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2130         isert_cmd->tx_desc.num_sge = 2;
2131
2132         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2133
2134         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2135
2136         return isert_post_response(isert_conn, isert_cmd);
2137 }
2138
2139 static int
2140 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2141 {
2142         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2143         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2144         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2145         struct iscsi_text_rsp *hdr =
2146                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2147         u32 txt_rsp_len;
2148         int rc;
2149
2150         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2151         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2152         if (rc < 0)
2153                 return rc;
2154
2155         txt_rsp_len = rc;
2156         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2157
2158         if (txt_rsp_len) {
2159                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2160                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2161                 void *txt_rsp_buf = cmd->buf_ptr;
2162
2163                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2164                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2165
2166                 isert_cmd->pdu_buf_len = txt_rsp_len;
2167                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2168                 tx_dsg->length  = txt_rsp_len;
2169                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2170                 isert_cmd->tx_desc.num_sge = 2;
2171         }
2172         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2173
2174         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2175
2176         return isert_post_response(isert_conn, isert_cmd);
2177 }
2178
2179 static int
2180 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2181                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2182                     u32 data_left, u32 offset)
2183 {
2184         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2185         struct scatterlist *sg_start, *tmp_sg;
2186         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2187         u32 sg_off, page_off;
2188         int i = 0, sg_nents;
2189
2190         sg_off = offset / PAGE_SIZE;
2191         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2192         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2193         page_off = offset % PAGE_SIZE;
2194
2195         send_wr->sg_list = ib_sge;
2196         send_wr->num_sge = sg_nents;
2197         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2198         /*
2199          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2200          */
2201         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2202                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2203                          (unsigned long long)tmp_sg->dma_address,
2204                          tmp_sg->length, page_off);
2205
2206                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2207                 ib_sge->length = min_t(u32, data_left,
2208                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2209                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2210
2211                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2212                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2213                 page_off = 0;
2214                 data_left -= ib_sge->length;
2215                 ib_sge++;
2216                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2217         }
2218
2219         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2220                  send_wr->sg_list, send_wr->num_sge);
2221
2222         return sg_nents;
2223 }
2224
2225 static int
2226 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2227                struct isert_rdma_wr *wr)
2228 {
2229         struct se_cmd *se_cmd = &cmd->se_cmd;
2230         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2231         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2232         struct isert_data_buf *data = &wr->data;
2233         struct ib_send_wr *send_wr;
2234         struct ib_sge *ib_sge;
2235         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2236         int ret = 0, i, ib_sge_cnt;
2237
2238         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2239
2240         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2241         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2242                                  se_cmd->t_data_nents, se_cmd->data_length,
2243                                  offset, wr->iser_ib_op, &wr->data);
2244         if (ret)
2245                 return ret;
2246
2247         data_left = data->len;
2248         offset = data->offset;
2249
2250         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2251         if (!ib_sge) {
2252                 pr_warn("Unable to allocate ib_sge\n");
2253                 ret = -ENOMEM;
2254                 goto unmap_cmd;
2255         }
2256         wr->ib_sge = ib_sge;
2257
2258         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2259         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2260                                 GFP_KERNEL);
2261         if (!wr->send_wr) {
2262                 pr_debug("Unable to allocate wr->send_wr\n");
2263                 ret = -ENOMEM;
2264                 goto unmap_cmd;
2265         }
2266
2267         wr->isert_cmd = isert_cmd;
2268         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2269
2270         for (i = 0; i < wr->send_wr_num; i++) {
2271                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2272                 data_len = min(data_left, rdma_write_max);
2273
2274                 send_wr->send_flags = 0;
2275                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2276                         send_wr->opcode = IB_WR_RDMA_WRITE;
2277                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2278                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2279                         if (i + 1 == wr->send_wr_num)
2280                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2281                         else
2282                                 send_wr->next = &wr->send_wr[i + 1];
2283                 } else {
2284                         send_wr->opcode = IB_WR_RDMA_READ;
2285                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2286                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2287                         if (i + 1 == wr->send_wr_num)
2288                                 send_wr->send_flags = IB_SEND_SIGNALED;
2289                         else
2290                                 send_wr->next = &wr->send_wr[i + 1];
2291                 }
2292
2293                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2294                                         send_wr, data_len, offset);
2295                 ib_sge += ib_sge_cnt;
2296
2297                 offset += data_len;
2298                 va_offset += data_len;
2299                 data_left -= data_len;
2300         }
2301
2302         return 0;
2303 unmap_cmd:
2304         isert_unmap_data_buf(isert_conn, data);
2305
2306         return ret;
2307 }
2308
2309 static int
2310 isert_map_fr_pagelist(struct ib_device *ib_dev,
2311                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2312 {
2313         u64 start_addr, end_addr, page, chunk_start = 0;
2314         struct scatterlist *tmp_sg;
2315         int i = 0, new_chunk, last_ent, n_pages;
2316
2317         n_pages = 0;
2318         new_chunk = 1;
2319         last_ent = sg_nents - 1;
2320         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2321                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2322                 if (new_chunk)
2323                         chunk_start = start_addr;
2324                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2325
2326                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2327                          i, (unsigned long long)tmp_sg->dma_address,
2328                          tmp_sg->length);
2329
2330                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2331                         new_chunk = 0;
2332                         continue;
2333                 }
2334                 new_chunk = 1;
2335
2336                 page = chunk_start & PAGE_MASK;
2337                 do {
2338                         fr_pl[n_pages++] = page;
2339                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2340                                  n_pages - 1, page);
2341                         page += PAGE_SIZE;
2342                 } while (page < end_addr);
2343         }
2344
2345         return n_pages;
2346 }
2347
2348 static int
2349 isert_fast_reg_mr(struct isert_conn *isert_conn,
2350                   struct fast_reg_descriptor *fr_desc,
2351                   struct isert_data_buf *mem,
2352                   struct ib_sge *sge)
2353 {
2354         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2355         struct ib_send_wr fr_wr, inv_wr;
2356         struct ib_send_wr *bad_wr, *wr = NULL;
2357         int ret, pagelist_len;
2358         u32 page_off;
2359         u8 key;
2360
2361         if (mem->dma_nents == 1) {
2362                 sge->lkey = isert_conn->conn_mr->lkey;
2363                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2364                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2365                 return 0;
2366         }
2367
2368         page_off = mem->offset % PAGE_SIZE;
2369
2370         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2371                  fr_desc, mem->nents, mem->offset);
2372
2373         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2374                                              &fr_desc->data_frpl->page_list[0]);
2375
2376         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2377                 memset(&inv_wr, 0, sizeof(inv_wr));
2378                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2379                 inv_wr.opcode = IB_WR_LOCAL_INV;
2380                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2381                 wr = &inv_wr;
2382                 /* Bump the key */
2383                 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2384                 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2385         }
2386
2387         /* Prepare FASTREG WR */
2388         memset(&fr_wr, 0, sizeof(fr_wr));
2389         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2390         fr_wr.opcode = IB_WR_FAST_REG_MR;
2391         fr_wr.wr.fast_reg.iova_start =
2392                 fr_desc->data_frpl->page_list[0] + page_off;
2393         fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2394         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2395         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2396         fr_wr.wr.fast_reg.length = mem->len;
2397         fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2398         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2399
2400         if (!wr)
2401                 wr = &fr_wr;
2402         else
2403                 wr->next = &fr_wr;
2404
2405         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2406         if (ret) {
2407                 pr_err("fast registration failed, ret:%d\n", ret);
2408                 return ret;
2409         }
2410         fr_desc->ind &= ~ISERT_DATA_KEY_VALID;
2411
2412         sge->lkey = fr_desc->data_mr->lkey;
2413         sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2414         sge->length = mem->len;
2415
2416         pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2417                  sge->addr, sge->length, sge->lkey);
2418
2419         return ret;
2420 }
2421
2422 static int
2423 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2424                struct isert_rdma_wr *wr)
2425 {
2426         struct se_cmd *se_cmd = &cmd->se_cmd;
2427         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2428         struct isert_conn *isert_conn = conn->context;
2429         struct ib_send_wr *send_wr;
2430         struct fast_reg_descriptor *fr_desc = NULL;
2431         u32 offset;
2432         int ret = 0;
2433         unsigned long flags;
2434
2435         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2436
2437         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2438         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2439                                  se_cmd->t_data_nents, se_cmd->data_length,
2440                                  offset, wr->iser_ib_op, &wr->data);
2441         if (ret)
2442                 return ret;
2443
2444         if (wr->data.dma_nents != 1) {
2445                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2446                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2447                                            struct fast_reg_descriptor, list);
2448                 list_del(&fr_desc->list);
2449                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2450                 wr->fr_desc = fr_desc;
2451         }
2452
2453         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data, &wr->s_ib_sge);
2454         if (ret)
2455                 goto unmap_cmd;
2456
2457         wr->ib_sge = &wr->s_ib_sge;
2458         wr->send_wr_num = 1;
2459         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2460         wr->send_wr = &wr->s_send_wr;
2461         wr->isert_cmd = isert_cmd;
2462
2463         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2464         send_wr->sg_list = &wr->s_ib_sge;
2465         send_wr->num_sge = 1;
2466         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2467         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2468                 send_wr->opcode = IB_WR_RDMA_WRITE;
2469                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2470                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2471                 send_wr->send_flags = 0;
2472                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2473         } else {
2474                 send_wr->opcode = IB_WR_RDMA_READ;
2475                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2476                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2477                 send_wr->send_flags = IB_SEND_SIGNALED;
2478         }
2479
2480         return 0;
2481 unmap_cmd:
2482         if (fr_desc) {
2483                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2484                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2485                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2486         }
2487         isert_unmap_data_buf(isert_conn, &wr->data);
2488
2489         return ret;
2490 }
2491
2492 static int
2493 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2494 {
2495         struct se_cmd *se_cmd = &cmd->se_cmd;
2496         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2497         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2498         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2499         struct isert_device *device = isert_conn->conn_device;
2500         struct ib_send_wr *wr_failed;
2501         int rc;
2502
2503         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2504                  isert_cmd, se_cmd->data_length);
2505         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2506         rc = device->reg_rdma_mem(conn, cmd, wr);
2507         if (rc) {
2508                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2509                 return rc;
2510         }
2511
2512         /*
2513          * Build isert_conn->tx_desc for iSCSI response PDU and attach
2514          */
2515         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2516         iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2517                              &isert_cmd->tx_desc.iscsi_header);
2518         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2519         isert_init_send_wr(isert_conn, isert_cmd,
2520                            &isert_cmd->tx_desc.send_wr, true);
2521
2522         atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2523
2524         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2525         if (rc) {
2526                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2527                 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
2528         }
2529         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2530                  isert_cmd);
2531
2532         return 1;
2533 }
2534
2535 static int
2536 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2537 {
2538         struct se_cmd *se_cmd = &cmd->se_cmd;
2539         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2540         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2541         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2542         struct isert_device *device = isert_conn->conn_device;
2543         struct ib_send_wr *wr_failed;
2544         int rc;
2545
2546         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2547                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2548         wr->iser_ib_op = ISER_IB_RDMA_READ;
2549         rc = device->reg_rdma_mem(conn, cmd, wr);
2550         if (rc) {
2551                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2552                 return rc;
2553         }
2554
2555         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2556
2557         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2558         if (rc) {
2559                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2560                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2561         }
2562         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2563                  isert_cmd);
2564
2565         return 0;
2566 }
2567
2568 static int
2569 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2570 {
2571         int ret;
2572
2573         switch (state) {
2574         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2575                 ret = isert_put_nopin(cmd, conn, false);
2576                 break;
2577         default:
2578                 pr_err("Unknown immediate state: 0x%02x\n", state);
2579                 ret = -EINVAL;
2580                 break;
2581         }
2582
2583         return ret;
2584 }
2585
2586 static int
2587 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2588 {
2589         int ret;
2590
2591         switch (state) {
2592         case ISTATE_SEND_LOGOUTRSP:
2593                 ret = isert_put_logout_rsp(cmd, conn);
2594                 if (!ret) {
2595                         pr_debug("Returning iSER Logout -EAGAIN\n");
2596                         ret = -EAGAIN;
2597                 }
2598                 break;
2599         case ISTATE_SEND_NOPIN:
2600                 ret = isert_put_nopin(cmd, conn, true);
2601                 break;
2602         case ISTATE_SEND_TASKMGTRSP:
2603                 ret = isert_put_tm_rsp(cmd, conn);
2604                 break;
2605         case ISTATE_SEND_REJECT:
2606                 ret = isert_put_reject(cmd, conn);
2607                 break;
2608         case ISTATE_SEND_TEXTRSP:
2609                 ret = isert_put_text_rsp(cmd, conn);
2610                 break;
2611         case ISTATE_SEND_STATUS:
2612                 /*
2613                  * Special case for sending non GOOD SCSI status from TX thread
2614                  * context during pre se_cmd excecution failure.
2615                  */
2616                 ret = isert_put_response(conn, cmd);
2617                 break;
2618         default:
2619                 pr_err("Unknown response state: 0x%02x\n", state);
2620                 ret = -EINVAL;
2621                 break;
2622         }
2623
2624         return ret;
2625 }
2626
2627 static int
2628 isert_setup_np(struct iscsi_np *np,
2629                struct __kernel_sockaddr_storage *ksockaddr)
2630 {
2631         struct isert_np *isert_np;
2632         struct rdma_cm_id *isert_lid;
2633         struct sockaddr *sa;
2634         int ret;
2635
2636         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2637         if (!isert_np) {
2638                 pr_err("Unable to allocate struct isert_np\n");
2639                 return -ENOMEM;
2640         }
2641         init_waitqueue_head(&isert_np->np_accept_wq);
2642         mutex_init(&isert_np->np_accept_mutex);
2643         INIT_LIST_HEAD(&isert_np->np_accept_list);
2644         init_completion(&isert_np->np_login_comp);
2645
2646         sa = (struct sockaddr *)ksockaddr;
2647         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2648         /*
2649          * Setup the np->np_sockaddr from the passed sockaddr setup
2650          * in iscsi_target_configfs.c code..
2651          */
2652         memcpy(&np->np_sockaddr, ksockaddr,
2653                sizeof(struct __kernel_sockaddr_storage));
2654
2655         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2656                                 IB_QPT_RC);
2657         if (IS_ERR(isert_lid)) {
2658                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2659                        PTR_ERR(isert_lid));
2660                 ret = PTR_ERR(isert_lid);
2661                 goto out;
2662         }
2663
2664         ret = rdma_bind_addr(isert_lid, sa);
2665         if (ret) {
2666                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2667                 goto out_lid;
2668         }
2669
2670         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2671         if (ret) {
2672                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2673                 goto out_lid;
2674         }
2675
2676         isert_np->np_cm_id = isert_lid;
2677         np->np_context = isert_np;
2678         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2679
2680         return 0;
2681
2682 out_lid:
2683         rdma_destroy_id(isert_lid);
2684 out:
2685         kfree(isert_np);
2686         return ret;
2687 }
2688
2689 static int
2690 isert_check_accept_queue(struct isert_np *isert_np)
2691 {
2692         int empty;
2693
2694         mutex_lock(&isert_np->np_accept_mutex);
2695         empty = list_empty(&isert_np->np_accept_list);
2696         mutex_unlock(&isert_np->np_accept_mutex);
2697
2698         return empty;
2699 }
2700
2701 static int
2702 isert_rdma_accept(struct isert_conn *isert_conn)
2703 {
2704         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2705         struct rdma_conn_param cp;
2706         int ret;
2707
2708         memset(&cp, 0, sizeof(struct rdma_conn_param));
2709         cp.responder_resources = isert_conn->responder_resources;
2710         cp.initiator_depth = isert_conn->initiator_depth;
2711         cp.retry_count = 7;
2712         cp.rnr_retry_count = 7;
2713
2714         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2715
2716         ret = rdma_accept(cm_id, &cp);
2717         if (ret) {
2718                 pr_err("rdma_accept() failed with: %d\n", ret);
2719                 return ret;
2720         }
2721
2722         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2723
2724         return 0;
2725 }
2726
2727 static int
2728 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2729 {
2730         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2731         int ret;
2732
2733         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2734         /*
2735          * For login requests after the first PDU, isert_rx_login_req() will
2736          * kick schedule_delayed_work(&conn->login_work) as the packet is
2737          * received, which turns this callback from iscsi_target_do_login_rx()
2738          * into a NOP.
2739          */
2740         if (!login->first_request)
2741                 return 0;
2742
2743         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2744         if (ret)
2745                 return ret;
2746
2747         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2748         return 0;
2749 }
2750
2751 static void
2752 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2753                     struct isert_conn *isert_conn)
2754 {
2755         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2756         struct rdma_route *cm_route = &cm_id->route;
2757         struct sockaddr_in *sock_in;
2758         struct sockaddr_in6 *sock_in6;
2759
2760         conn->login_family = np->np_sockaddr.ss_family;
2761
2762         if (np->np_sockaddr.ss_family == AF_INET6) {
2763                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2764                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2765                          &sock_in6->sin6_addr.in6_u);
2766                 conn->login_port = ntohs(sock_in6->sin6_port);
2767
2768                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2769                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2770                          &sock_in6->sin6_addr.in6_u);
2771                 conn->local_port = ntohs(sock_in6->sin6_port);
2772         } else {
2773                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2774                 sprintf(conn->login_ip, "%pI4",
2775                         &sock_in->sin_addr.s_addr);
2776                 conn->login_port = ntohs(sock_in->sin_port);
2777
2778                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2779                 sprintf(conn->local_ip, "%pI4",
2780                         &sock_in->sin_addr.s_addr);
2781                 conn->local_port = ntohs(sock_in->sin_port);
2782         }
2783 }
2784
2785 static int
2786 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2787 {
2788         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2789         struct isert_conn *isert_conn;
2790         int max_accept = 0, ret;
2791
2792 accept_wait:
2793         ret = wait_event_interruptible(isert_np->np_accept_wq,
2794                         !isert_check_accept_queue(isert_np) ||
2795                         np->np_thread_state == ISCSI_NP_THREAD_RESET);
2796         if (max_accept > 5)
2797                 return -ENODEV;
2798
2799         spin_lock_bh(&np->np_thread_lock);
2800         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2801                 spin_unlock_bh(&np->np_thread_lock);
2802                 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2803                 return -ENODEV;
2804         }
2805         spin_unlock_bh(&np->np_thread_lock);
2806
2807         mutex_lock(&isert_np->np_accept_mutex);
2808         if (list_empty(&isert_np->np_accept_list)) {
2809                 mutex_unlock(&isert_np->np_accept_mutex);
2810                 max_accept++;
2811                 goto accept_wait;
2812         }
2813         isert_conn = list_first_entry(&isert_np->np_accept_list,
2814                         struct isert_conn, conn_accept_node);
2815         list_del_init(&isert_conn->conn_accept_node);
2816         mutex_unlock(&isert_np->np_accept_mutex);
2817
2818         conn->context = isert_conn;
2819         isert_conn->conn = conn;
2820         max_accept = 0;
2821
2822         ret = isert_rdma_post_recvl(isert_conn);
2823         if (ret)
2824                 return ret;
2825
2826         ret = isert_rdma_accept(isert_conn);
2827         if (ret)
2828                 return ret;
2829
2830         isert_set_conn_info(np, conn, isert_conn);
2831
2832         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2833         return 0;
2834 }
2835
2836 static void
2837 isert_free_np(struct iscsi_np *np)
2838 {
2839         struct isert_np *isert_np = (struct isert_np *)np->np_context;
2840
2841         rdma_destroy_id(isert_np->np_cm_id);
2842
2843         np->np_context = NULL;
2844         kfree(isert_np);
2845 }
2846
2847 static void isert_wait_conn(struct iscsi_conn *conn)
2848 {
2849         struct isert_conn *isert_conn = conn->context;
2850
2851         pr_debug("isert_wait_conn: Starting \n");
2852         /*
2853          * Decrement post_send_buf_count for special case when called
2854          * from isert_do_control_comp() -> iscsit_logout_post_handler()
2855          */
2856         mutex_lock(&isert_conn->conn_mutex);
2857         if (isert_conn->logout_posted)
2858                 atomic_dec(&isert_conn->post_send_buf_count);
2859
2860         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
2861                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
2862                 rdma_disconnect(isert_conn->conn_cm_id);
2863         }
2864         /*
2865          * Only wait for conn_wait_comp_err if the isert_conn made it
2866          * into full feature phase..
2867          */
2868         if (isert_conn->state == ISER_CONN_INIT) {
2869                 mutex_unlock(&isert_conn->conn_mutex);
2870                 return;
2871         }
2872         if (isert_conn->state == ISER_CONN_UP)
2873                 isert_conn->state = ISER_CONN_TERMINATING;
2874         mutex_unlock(&isert_conn->conn_mutex);
2875
2876         wait_for_completion(&isert_conn->conn_wait_comp_err);
2877
2878         wait_for_completion(&isert_conn->conn_wait);
2879 }
2880
2881 static void isert_free_conn(struct iscsi_conn *conn)
2882 {
2883         struct isert_conn *isert_conn = conn->context;
2884
2885         isert_put_conn(isert_conn);
2886 }
2887
2888 static struct iscsit_transport iser_target_transport = {
2889         .name                   = "IB/iSER",
2890         .transport_type         = ISCSI_INFINIBAND,
2891         .priv_size              = sizeof(struct isert_cmd),
2892         .owner                  = THIS_MODULE,
2893         .iscsit_setup_np        = isert_setup_np,
2894         .iscsit_accept_np       = isert_accept_np,
2895         .iscsit_free_np         = isert_free_np,
2896         .iscsit_wait_conn       = isert_wait_conn,
2897         .iscsit_free_conn       = isert_free_conn,
2898         .iscsit_get_login_rx    = isert_get_login_rx,
2899         .iscsit_put_login_tx    = isert_put_login_tx,
2900         .iscsit_immediate_queue = isert_immediate_queue,
2901         .iscsit_response_queue  = isert_response_queue,
2902         .iscsit_get_dataout     = isert_get_dataout,
2903         .iscsit_queue_data_in   = isert_put_datain,
2904         .iscsit_queue_status    = isert_put_response,
2905 };
2906
2907 static int __init isert_init(void)
2908 {
2909         int ret;
2910
2911         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2912         if (!isert_rx_wq) {
2913                 pr_err("Unable to allocate isert_rx_wq\n");
2914                 return -ENOMEM;
2915         }
2916
2917         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2918         if (!isert_comp_wq) {
2919                 pr_err("Unable to allocate isert_comp_wq\n");
2920                 ret = -ENOMEM;
2921                 goto destroy_rx_wq;
2922         }
2923
2924         iscsit_register_transport(&iser_target_transport);
2925         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2926         return 0;
2927
2928 destroy_rx_wq:
2929         destroy_workqueue(isert_rx_wq);
2930         return ret;
2931 }
2932
2933 static void __exit isert_exit(void)
2934 {
2935         destroy_workqueue(isert_comp_wq);
2936         destroy_workqueue(isert_rx_wq);
2937         iscsit_unregister_transport(&iser_target_transport);
2938         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2939 }
2940
2941 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2942 MODULE_VERSION("0.1");
2943 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2944 MODULE_LICENSE("GPL");
2945
2946 module_init(isert_init);
2947 module_exit(isert_exit);