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 <rdma/ib_verbs.h>
  26 #include <rdma/rdma_cm.h>
  27 #include <target/target_core_base.h>
  28 #include <target/target_core_fabric.h>
  29 #include <target/iscsi/iscsi_transport.h>
  30 #include <linux/semaphore.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 #define ISER_MAX_CQ_LEN         (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
  39                                  ISERT_MAX_CONN)
  40
  41 static int isert_debug_level;
  42 module_param_named(debug_level, isert_debug_level, int, 0644);
  43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
  44
  45 static DEFINE_MUTEX(device_list_mutex);
  46 static LIST_HEAD(device_list);
  47 static struct workqueue_struct *isert_comp_wq;
  48 static struct workqueue_struct *isert_release_wq;
  49
  50 static void
  51 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static void
  56 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  57 static int
  58 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  59                struct isert_rdma_wr *wr);
  60 static int
  61 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  62 static int
  63 isert_rdma_post_recvl(struct isert_conn *isert_conn);
  64 static int
  65 isert_rdma_accept(struct isert_conn *isert_conn);
  66 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
  67
  68 static void isert_release_work(struct work_struct *work);
  69
  70 static inline bool
  71 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
  72 {
  73         return (conn->pi_support &&
  74                 cmd->prot_op != TARGET_PROT_NORMAL);
  75 }
  76
  77
  78 static void
  79 isert_qp_event_callback(struct ib_event *e, void *context)
  80 {
  81         struct isert_conn *isert_conn = context;
  82
  83         isert_err("%s (%d): conn %p\n",
  84                   ib_event_msg(e->event), e->event, isert_conn);
  85
  86         switch (e->event) {
  87         case IB_EVENT_COMM_EST:
  88                 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
  89                 break;
  90         case IB_EVENT_QP_LAST_WQE_REACHED:
  91                 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
  92                 break;
  93         default:
  94                 break;
  95         }
  96 }
  97
  98 static int
  99 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
 100 {
 101         int ret;
 102
 103         ret = ib_query_device(ib_dev, devattr);
 104         if (ret) {
 105                 isert_err("ib_query_device() failed: %d\n", ret);
 106                 return ret;
 107         }
 108         isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
 109         isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
 110
 111         return 0;
 112 }
 113
 114 static struct isert_comp *
 115 isert_comp_get(struct isert_conn *isert_conn)
 116 {
 117         struct isert_device *device = isert_conn->device;
 118         struct isert_comp *comp;
 119         int i, min = 0;
 120
 121         mutex_lock(&device_list_mutex);
 122         for (i = 0; i < device->comps_used; i++)
 123                 if (device->comps[i].active_qps <
 124                     device->comps[min].active_qps)
 125                         min = i;
 126         comp = &device->comps[min];
 127         comp->active_qps++;
 128         mutex_unlock(&device_list_mutex);
 129
 130         isert_info("conn %p, using comp %p min_index: %d\n",
 131                    isert_conn, comp, min);
 132
 133         return comp;
 134 }
 135
 136 static void
 137 isert_comp_put(struct isert_comp *comp)
 138 {
 139         mutex_lock(&device_list_mutex);
 140         comp->active_qps--;
 141         mutex_unlock(&device_list_mutex);
 142 }
 143
 144 static struct ib_qp *
 145 isert_create_qp(struct isert_conn *isert_conn,
 146                 struct isert_comp *comp,
 147                 struct rdma_cm_id *cma_id)
 148 {
 149         struct isert_device *device = isert_conn->device;
 150         struct ib_qp_init_attr attr;
 151         int ret;
 152
 153         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 154         attr.event_handler = isert_qp_event_callback;
 155         attr.qp_context = isert_conn;
 156         attr.send_cq = comp->cq;
 157         attr.recv_cq = comp->cq;
 158         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 159         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
 160         /*
 161          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 162          * work-around for RDMA_READs with ConnectX-2.
 163          *
 164          * Also, still make sure to have at least two SGEs for
 165          * outgoing control PDU responses.
 166          */
 167         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 168         isert_conn->max_sge = attr.cap.max_send_sge;
 169
 170         attr.cap.max_recv_sge = 1;
 171         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 172         attr.qp_type = IB_QPT_RC;
 173         if (device->pi_capable)
 174                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 175
 176         ret = rdma_create_qp(cma_id, device->pd, &attr);
 177         if (ret) {
 178                 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
 179                 return ERR_PTR(ret);
 180         }
 181
 182         return cma_id->qp;
 183 }
 184
 185 static int
 186 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
 187 {
 188         struct isert_comp *comp;
 189         int ret;
 190
 191         comp = isert_comp_get(isert_conn);
 192         isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
 193         if (IS_ERR(isert_conn->qp)) {
 194                 ret = PTR_ERR(isert_conn->qp);
 195                 goto err;
 196         }
 197
 198         return 0;
 199 err:
 200         isert_comp_put(comp);
 201         return ret;
 202 }
 203
 204 static void
 205 isert_cq_event_callback(struct ib_event *e, void *context)
 206 {
 207         isert_dbg("event: %d\n", e->event);
 208 }
 209
 210 static int
 211 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 212 {
 213         struct isert_device *device = isert_conn->device;
 214         struct ib_device *ib_dev = device->ib_device;
 215         struct iser_rx_desc *rx_desc;
 216         struct ib_sge *rx_sg;
 217         u64 dma_addr;
 218         int i, j;
 219
 220         isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 221                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 222         if (!isert_conn->rx_descs)
 223                 goto fail;
 224
 225         rx_desc = isert_conn->rx_descs;
 226
 227         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 228                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 229                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 230                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 231                         goto dma_map_fail;
 232
 233                 rx_desc->dma_addr = dma_addr;
 234
 235                 rx_sg = &rx_desc->rx_sg;
 236                 rx_sg->addr = rx_desc->dma_addr;
 237                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 238                 rx_sg->lkey = device->pd->local_dma_lkey;
 239         }
 240
 241         return 0;
 242
 243 dma_map_fail:
 244         rx_desc = isert_conn->rx_descs;
 245         for (j = 0; j < i; j++, rx_desc++) {
 246                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 247                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 248         }
 249         kfree(isert_conn->rx_descs);
 250         isert_conn->rx_descs = NULL;
 251 fail:
 252         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 253
 254         return -ENOMEM;
 255 }
 256
 257 static void
 258 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 259 {
 260         struct ib_device *ib_dev = isert_conn->device->ib_device;
 261         struct iser_rx_desc *rx_desc;
 262         int i;
 263
 264         if (!isert_conn->rx_descs)
 265                 return;
 266
 267         rx_desc = isert_conn->rx_descs;
 268         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 269                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 270                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 271         }
 272
 273         kfree(isert_conn->rx_descs);
 274         isert_conn->rx_descs = NULL;
 275 }
 276
 277 static void isert_cq_work(struct work_struct *);
 278 static void isert_cq_callback(struct ib_cq *, void *);
 279
 280 static void
 281 isert_free_comps(struct isert_device *device)
 282 {
 283         int i;
 284
 285         for (i = 0; i < device->comps_used; i++) {
 286                 struct isert_comp *comp = &device->comps[i];
 287
 288                 if (comp->cq) {
 289                         cancel_work_sync(&comp->work);
 290                         ib_destroy_cq(comp->cq);
 291                 }
 292         }
 293         kfree(device->comps);
 294 }
 295
 296 static int
 297 isert_alloc_comps(struct isert_device *device,
 298                   struct ib_device_attr *attr)
 299 {
 300         int i, max_cqe, ret = 0;
 301
 302         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 303                                  device->ib_device->num_comp_vectors));
 304
 305         isert_info("Using %d CQs, %s supports %d vectors support "
 306                    "Fast registration %d pi_capable %d\n",
 307                    device->comps_used, device->ib_device->name,
 308                    device->ib_device->num_comp_vectors, device->use_fastreg,
 309                    device->pi_capable);
 310
 311         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 312                                 GFP_KERNEL);
 313         if (!device->comps) {
 314                 isert_err("Unable to allocate completion contexts\n");
 315                 return -ENOMEM;
 316         }
 317
 318         max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
 319
 320         for (i = 0; i < device->comps_used; i++) {
 321                 struct ib_cq_init_attr cq_attr = {};
 322                 struct isert_comp *comp = &device->comps[i];
 323
 324                 comp->device = device;
 325                 INIT_WORK(&comp->work, isert_cq_work);
 326                 cq_attr.cqe = max_cqe;
 327                 cq_attr.comp_vector = i;
 328                 comp->cq = ib_create_cq(device->ib_device,
 329                                         isert_cq_callback,
 330                                         isert_cq_event_callback,
 331                                         (void *)comp,
 332                                         &cq_attr);
 333                 if (IS_ERR(comp->cq)) {
 334                         isert_err("Unable to allocate cq\n");
 335                         ret = PTR_ERR(comp->cq);
 336                         comp->cq = NULL;
 337                         goto out_cq;
 338                 }
 339
 340                 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
 341                 if (ret)
 342                         goto out_cq;
 343         }
 344
 345         return 0;
 346 out_cq:
 347         isert_free_comps(device);
 348         return ret;
 349 }
 350
 351 static int
 352 isert_create_device_ib_res(struct isert_device *device)
 353 {
 354         struct ib_device_attr *dev_attr;
 355         int ret;
 356
 357         dev_attr = &device->dev_attr;
 358         ret = isert_query_device(device->ib_device, dev_attr);
 359         if (ret)
 360                 return ret;
 361
 362         /* asign function handlers */
 363         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 364             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 365                 device->use_fastreg = 1;
 366                 device->reg_rdma_mem = isert_reg_rdma;
 367                 device->unreg_rdma_mem = isert_unreg_rdma;
 368         } else {
 369                 device->use_fastreg = 0;
 370                 device->reg_rdma_mem = isert_map_rdma;
 371                 device->unreg_rdma_mem = isert_unmap_cmd;
 372         }
 373
 374         ret = isert_alloc_comps(device, dev_attr);
 375         if (ret)
 376                 return ret;
 377
 378         device->pd = ib_alloc_pd(device->ib_device);
 379         if (IS_ERR(device->pd)) {
 380                 ret = PTR_ERR(device->pd);
 381                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 382                           device, ret);
 383                 goto out_cq;
 384         }
 385
 386         /* Check signature cap */
 387         device->pi_capable = dev_attr->device_cap_flags &
 388                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 389
 390         return 0;
 391
 392 out_cq:
 393         isert_free_comps(device);
 394         return ret;
 395 }
 396
 397 static void
 398 isert_free_device_ib_res(struct isert_device *device)
 399 {
 400         isert_info("device %p\n", device);
 401
 402         ib_dealloc_pd(device->pd);
 403         isert_free_comps(device);
 404 }
 405
 406 static void
 407 isert_device_put(struct isert_device *device)
 408 {
 409         mutex_lock(&device_list_mutex);
 410         device->refcount--;
 411         isert_info("device %p refcount %d\n", device, device->refcount);
 412         if (!device->refcount) {
 413                 isert_free_device_ib_res(device);
 414                 list_del(&device->dev_node);
 415                 kfree(device);
 416         }
 417         mutex_unlock(&device_list_mutex);
 418 }
 419
 420 static struct isert_device *
 421 isert_device_get(struct rdma_cm_id *cma_id)
 422 {
 423         struct isert_device *device;
 424         int ret;
 425
 426         mutex_lock(&device_list_mutex);
 427         list_for_each_entry(device, &device_list, dev_node) {
 428                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 429                         device->refcount++;
 430                         isert_info("Found iser device %p refcount %d\n",
 431                                    device, device->refcount);
 432                         mutex_unlock(&device_list_mutex);
 433                         return device;
 434                 }
 435         }
 436
 437         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 438         if (!device) {
 439                 mutex_unlock(&device_list_mutex);
 440                 return ERR_PTR(-ENOMEM);
 441         }
 442
 443         INIT_LIST_HEAD(&device->dev_node);
 444
 445         device->ib_device = cma_id->device;
 446         ret = isert_create_device_ib_res(device);
 447         if (ret) {
 448                 kfree(device);
 449                 mutex_unlock(&device_list_mutex);
 450                 return ERR_PTR(ret);
 451         }
 452
 453         device->refcount++;
 454         list_add_tail(&device->dev_node, &device_list);
 455         isert_info("Created a new iser device %p refcount %d\n",
 456                    device, device->refcount);
 457         mutex_unlock(&device_list_mutex);
 458
 459         return device;
 460 }
 461
 462 static void
 463 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 464 {
 465         struct fast_reg_descriptor *fr_desc, *tmp;
 466         int i = 0;
 467
 468         if (list_empty(&isert_conn->fr_pool))
 469                 return;
 470
 471         isert_info("Freeing conn %p fastreg pool", isert_conn);
 472
 473         list_for_each_entry_safe(fr_desc, tmp,
 474                                  &isert_conn->fr_pool, list) {
 475                 list_del(&fr_desc->list);
 476                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 477                 ib_dereg_mr(fr_desc->data_mr);
 478                 if (fr_desc->pi_ctx) {
 479                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 480                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 481                         ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
 482                         kfree(fr_desc->pi_ctx);
 483                 }
 484                 kfree(fr_desc);
 485                 ++i;
 486         }
 487
 488         if (i < isert_conn->fr_pool_size)
 489                 isert_warn("Pool still has %d regions registered\n",
 490                         isert_conn->fr_pool_size - i);
 491 }
 492
 493 static int
 494 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
 495                     struct ib_device *device,
 496                     struct ib_pd *pd)
 497 {
 498         struct pi_context *pi_ctx;
 499         int ret;
 500
 501         pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
 502         if (!pi_ctx) {
 503                 isert_err("Failed to allocate pi context\n");
 504                 return -ENOMEM;
 505         }
 506
 507         pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
 508                                             ISCSI_ISER_SG_TABLESIZE);
 509         if (IS_ERR(pi_ctx->prot_frpl)) {
 510                 isert_err("Failed to allocate prot frpl err=%ld\n",
 511                           PTR_ERR(pi_ctx->prot_frpl));
 512                 ret = PTR_ERR(pi_ctx->prot_frpl);
 513                 goto err_pi_ctx;
 514         }
 515
 516         pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
 517                                       ISCSI_ISER_SG_TABLESIZE);
 518         if (IS_ERR(pi_ctx->prot_mr)) {
 519                 isert_err("Failed to allocate prot frmr err=%ld\n",
 520                           PTR_ERR(pi_ctx->prot_mr));
 521                 ret = PTR_ERR(pi_ctx->prot_mr);
 522                 goto err_prot_frpl;
 523         }
 524         desc->ind |= ISERT_PROT_KEY_VALID;
 525
 526         pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
 527         if (IS_ERR(pi_ctx->sig_mr)) {
 528                 isert_err("Failed to allocate signature enabled mr err=%ld\n",
 529                           PTR_ERR(pi_ctx->sig_mr));
 530                 ret = PTR_ERR(pi_ctx->sig_mr);
 531                 goto err_prot_mr;
 532         }
 533
 534         desc->pi_ctx = pi_ctx;
 535         desc->ind |= ISERT_SIG_KEY_VALID;
 536         desc->ind &= ~ISERT_PROTECTED;
 537
 538         return 0;
 539
 540 err_prot_mr:
 541         ib_dereg_mr(pi_ctx->prot_mr);
 542 err_prot_frpl:
 543         ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
 544 err_pi_ctx:
 545         kfree(pi_ctx);
 546
 547         return ret;
 548 }
 549
 550 static int
 551 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 552                      struct fast_reg_descriptor *fr_desc)
 553 {
 554         int ret;
 555
 556         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 557                                                          ISCSI_ISER_SG_TABLESIZE);
 558         if (IS_ERR(fr_desc->data_frpl)) {
 559                 isert_err("Failed to allocate data frpl err=%ld\n",
 560                           PTR_ERR(fr_desc->data_frpl));
 561                 return PTR_ERR(fr_desc->data_frpl);
 562         }
 563
 564         fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
 565                                        ISCSI_ISER_SG_TABLESIZE);
 566         if (IS_ERR(fr_desc->data_mr)) {
 567                 isert_err("Failed to allocate data frmr err=%ld\n",
 568                           PTR_ERR(fr_desc->data_mr));
 569                 ret = PTR_ERR(fr_desc->data_mr);
 570                 goto err_data_frpl;
 571         }
 572         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 573
 574         isert_dbg("Created fr_desc %p\n", fr_desc);
 575
 576         return 0;
 577
 578 err_data_frpl:
 579         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 580
 581         return ret;
 582 }
 583
 584 static int
 585 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 586 {
 587         struct fast_reg_descriptor *fr_desc;
 588         struct isert_device *device = isert_conn->device;
 589         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 590         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 591         int i, ret, tag_num;
 592         /*
 593          * Setup the number of FRMRs based upon the number of tags
 594          * available to session in iscsi_target_locate_portal().
 595          */
 596         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 597         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 598
 599         isert_conn->fr_pool_size = 0;
 600         for (i = 0; i < tag_num; i++) {
 601                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 602                 if (!fr_desc) {
 603                         isert_err("Failed to allocate fast_reg descriptor\n");
 604                         ret = -ENOMEM;
 605                         goto err;
 606                 }
 607
 608                 ret = isert_create_fr_desc(device->ib_device,
 609                                            device->pd, fr_desc);
 610                 if (ret) {
 611                         isert_err("Failed to create fastreg descriptor err=%d\n",
 612                                ret);
 613                         kfree(fr_desc);
 614                         goto err;
 615                 }
 616
 617                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
 618                 isert_conn->fr_pool_size++;
 619         }
 620
 621         isert_dbg("Creating conn %p fastreg pool size=%d",
 622                  isert_conn, isert_conn->fr_pool_size);
 623
 624         return 0;
 625
 626 err:
 627         isert_conn_free_fastreg_pool(isert_conn);
 628         return ret;
 629 }
 630
 631 static void
 632 isert_init_conn(struct isert_conn *isert_conn)
 633 {
 634         isert_conn->state = ISER_CONN_INIT;
 635         INIT_LIST_HEAD(&isert_conn->node);
 636         init_completion(&isert_conn->login_comp);
 637         init_completion(&isert_conn->login_req_comp);
 638         init_completion(&isert_conn->wait);
 639         kref_init(&isert_conn->kref);
 640         mutex_init(&isert_conn->mutex);
 641         spin_lock_init(&isert_conn->pool_lock);
 642         INIT_LIST_HEAD(&isert_conn->fr_pool);
 643         INIT_WORK(&isert_conn->release_work, isert_release_work);
 644 }
 645
 646 static void
 647 isert_free_login_buf(struct isert_conn *isert_conn)
 648 {
 649         struct ib_device *ib_dev = isert_conn->device->ib_device;
 650
 651         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 652                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 653         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 654                             ISCSI_DEF_MAX_RECV_SEG_LEN,
 655                             DMA_FROM_DEVICE);
 656         kfree(isert_conn->login_buf);
 657 }
 658
 659 static int
 660 isert_alloc_login_buf(struct isert_conn *isert_conn,
 661                       struct ib_device *ib_dev)
 662 {
 663         int ret;
 664
 665         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 666                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 667         if (!isert_conn->login_buf) {
 668                 isert_err("Unable to allocate isert_conn->login_buf\n");
 669                 return -ENOMEM;
 670         }
 671
 672         isert_conn->login_req_buf = isert_conn->login_buf;
 673         isert_conn->login_rsp_buf = isert_conn->login_buf +
 674                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 675
 676         isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 677                  isert_conn->login_buf, isert_conn->login_req_buf,
 678                  isert_conn->login_rsp_buf);
 679
 680         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 681                                 (void *)isert_conn->login_req_buf,
 682                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 683
 684         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 685         if (ret) {
 686                 isert_err("login_req_dma mapping error: %d\n", ret);
 687                 isert_conn->login_req_dma = 0;
 688                 goto out_login_buf;
 689         }
 690
 691         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 692                                         (void *)isert_conn->login_rsp_buf,
 693                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 694
 695         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 696         if (ret) {
 697                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 698                 isert_conn->login_rsp_dma = 0;
 699                 goto out_req_dma_map;
 700         }
 701
 702         return 0;
 703
 704 out_req_dma_map:
 705         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 706                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 707 out_login_buf:
 708         kfree(isert_conn->login_buf);
 709         return ret;
 710 }
 711
 712 static int
 713 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 714 {
 715         struct isert_np *isert_np = cma_id->context;
 716         struct iscsi_np *np = isert_np->np;
 717         struct isert_conn *isert_conn;
 718         struct isert_device *device;
 719         int ret = 0;
 720
 721         spin_lock_bh(&np->np_thread_lock);
 722         if (!np->enabled) {
 723                 spin_unlock_bh(&np->np_thread_lock);
 724                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 725                 return rdma_reject(cma_id, NULL, 0);
 726         }
 727         spin_unlock_bh(&np->np_thread_lock);
 728
 729         isert_dbg("cma_id: %p, portal: %p\n",
 730                  cma_id, cma_id->context);
 731
 732         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 733         if (!isert_conn)
 734                 return -ENOMEM;
 735
 736         isert_init_conn(isert_conn);
 737         isert_conn->cm_id = cma_id;
 738
 739         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 740         if (ret)
 741                 goto out;
 742
 743         device = isert_device_get(cma_id);
 744         if (IS_ERR(device)) {
 745                 ret = PTR_ERR(device);
 746                 goto out_rsp_dma_map;
 747         }
 748         isert_conn->device = device;
 749
 750         /* Set max inflight RDMA READ requests */
 751         isert_conn->initiator_depth = min_t(u8,
 752                                 event->param.conn.initiator_depth,
 753                                 device->dev_attr.max_qp_init_rd_atom);
 754         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 755
 756         ret = isert_conn_setup_qp(isert_conn, cma_id);
 757         if (ret)
 758                 goto out_conn_dev;
 759
 760         ret = isert_rdma_post_recvl(isert_conn);
 761         if (ret)
 762                 goto out_conn_dev;
 763
 764         ret = isert_rdma_accept(isert_conn);
 765         if (ret)
 766                 goto out_conn_dev;
 767
 768         mutex_lock(&isert_np->mutex);
 769         list_add_tail(&isert_conn->node, &isert_np->accepted);
 770         mutex_unlock(&isert_np->mutex);
 771
 772         return 0;
 773
 774 out_conn_dev:
 775         isert_device_put(device);
 776 out_rsp_dma_map:
 777         isert_free_login_buf(isert_conn);
 778 out:
 779         kfree(isert_conn);
 780         rdma_reject(cma_id, NULL, 0);
 781         return ret;
 782 }
 783
 784 static void
 785 isert_connect_release(struct isert_conn *isert_conn)
 786 {
 787         struct isert_device *device = isert_conn->device;
 788
 789         isert_dbg("conn %p\n", isert_conn);
 790
 791         BUG_ON(!device);
 792
 793         if (device->use_fastreg)
 794                 isert_conn_free_fastreg_pool(isert_conn);
 795
 796         isert_free_rx_descriptors(isert_conn);
 797         if (isert_conn->cm_id)
 798                 rdma_destroy_id(isert_conn->cm_id);
 799
 800         if (isert_conn->qp) {
 801                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 802
 803                 isert_comp_put(comp);
 804                 ib_destroy_qp(isert_conn->qp);
 805         }
 806
 807         if (isert_conn->login_buf)
 808                 isert_free_login_buf(isert_conn);
 809
 810         isert_device_put(device);
 811
 812         kfree(isert_conn);
 813 }
 814
 815 static void
 816 isert_connected_handler(struct rdma_cm_id *cma_id)
 817 {
 818         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 819         struct isert_np *isert_np = cma_id->context;
 820
 821         isert_info("conn %p\n", isert_conn);
 822
 823         mutex_lock(&isert_conn->mutex);
 824         isert_conn->state = ISER_CONN_UP;
 825         kref_get(&isert_conn->kref);
 826         mutex_unlock(&isert_conn->mutex);
 827
 828         mutex_lock(&isert_np->mutex);
 829         list_move_tail(&isert_conn->node, &isert_np->pending);
 830         mutex_unlock(&isert_np->mutex);
 831
 832         isert_info("np %p: Allow accept_np to continue\n", isert_np);
 833         up(&isert_np->sem);
 834 }
 835
 836 static void
 837 isert_release_kref(struct kref *kref)
 838 {
 839         struct isert_conn *isert_conn = container_of(kref,
 840                                 struct isert_conn, kref);
 841
 842         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 843                    current->pid);
 844
 845         isert_connect_release(isert_conn);
 846 }
 847
 848 static void
 849 isert_put_conn(struct isert_conn *isert_conn)
 850 {
 851         kref_put(&isert_conn->kref, isert_release_kref);
 852 }
 853
 854 /**
 855  * isert_conn_terminate() - Initiate connection termination
 856  * @isert_conn: isert connection struct
 857  *
 858  * Notes:
 859  * In case the connection state is FULL_FEATURE, move state
 860  * to TEMINATING and start teardown sequence (rdma_disconnect).
 861  * In case the connection state is UP, complete flush as well.
 862  *
 863  * This routine must be called with mutex held. Thus it is
 864  * safe to call multiple times.
 865  */
 866 static void
 867 isert_conn_terminate(struct isert_conn *isert_conn)
 868 {
 869         int err;
 870
 871         switch (isert_conn->state) {
 872         case ISER_CONN_TERMINATING:
 873                 break;
 874         case ISER_CONN_UP:
 875         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 876                 isert_info("Terminating conn %p state %d\n",
 877                            isert_conn, isert_conn->state);
 878                 isert_conn->state = ISER_CONN_TERMINATING;
 879                 err = rdma_disconnect(isert_conn->cm_id);
 880                 if (err)
 881                         isert_warn("Failed rdma_disconnect isert_conn %p\n",
 882                                    isert_conn);
 883                 break;
 884         default:
 885                 isert_warn("conn %p teminating in state %d\n",
 886                            isert_conn, isert_conn->state);
 887         }
 888 }
 889
 890 static int
 891 isert_np_cma_handler(struct isert_np *isert_np,
 892                      enum rdma_cm_event_type event)
 893 {
 894         isert_dbg("%s (%d): isert np %p\n",
 895                   rdma_event_msg(event), event, isert_np);
 896
 897         switch (event) {
 898         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 899                 isert_np->cm_id = NULL;
 900                 break;
 901         case RDMA_CM_EVENT_ADDR_CHANGE:
 902                 isert_np->cm_id = isert_setup_id(isert_np);
 903                 if (IS_ERR(isert_np->cm_id)) {
 904                         isert_err("isert np %p setup id failed: %ld\n",
 905                                   isert_np, PTR_ERR(isert_np->cm_id));
 906                         isert_np->cm_id = NULL;
 907                 }
 908                 break;
 909         default:
 910                 isert_err("isert np %p Unexpected event %d\n",
 911                           isert_np, event);
 912         }
 913
 914         return -1;
 915 }
 916
 917 static int
 918 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 919                            enum rdma_cm_event_type event)
 920 {
 921         struct isert_np *isert_np = cma_id->context;
 922         struct isert_conn *isert_conn;
 923         bool terminating = false;
 924
 925         if (isert_np->cm_id == cma_id)
 926                 return isert_np_cma_handler(cma_id->context, event);
 927
 928         isert_conn = cma_id->qp->qp_context;
 929
 930         mutex_lock(&isert_conn->mutex);
 931         terminating = (isert_conn->state == ISER_CONN_TERMINATING);
 932         isert_conn_terminate(isert_conn);
 933         mutex_unlock(&isert_conn->mutex);
 934
 935         isert_info("conn %p completing wait\n", isert_conn);
 936         complete(&isert_conn->wait);
 937
 938         if (terminating)
 939                 goto out;
 940
 941         mutex_lock(&isert_np->mutex);
 942         if (!list_empty(&isert_conn->node)) {
 943                 list_del_init(&isert_conn->node);
 944                 isert_put_conn(isert_conn);
 945                 queue_work(isert_release_wq, &isert_conn->release_work);
 946         }
 947         mutex_unlock(&isert_np->mutex);
 948
 949 out:
 950         return 0;
 951 }
 952
 953 static int
 954 isert_connect_error(struct rdma_cm_id *cma_id)
 955 {
 956         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 957
 958         list_del_init(&isert_conn->node);
 959         isert_conn->cm_id = NULL;
 960         isert_put_conn(isert_conn);
 961
 962         return -1;
 963 }
 964
 965 static int
 966 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 967 {
 968         int ret = 0;
 969
 970         isert_info("%s (%d): status %d id %p np %p\n",
 971                    rdma_event_msg(event->event), event->event,
 972                    event->status, cma_id, cma_id->context);
 973
 974         switch (event->event) {
 975         case RDMA_CM_EVENT_CONNECT_REQUEST:
 976                 ret = isert_connect_request(cma_id, event);
 977                 if (ret)
 978                         isert_err("failed handle connect request %d\n", ret);
 979                 break;
 980         case RDMA_CM_EVENT_ESTABLISHED:
 981                 isert_connected_handler(cma_id);
 982                 break;
 983         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 984         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 985         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 986         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 987                 ret = isert_disconnected_handler(cma_id, event->event);
 988                 break;
 989         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 990         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 991         case RDMA_CM_EVENT_CONNECT_ERROR:
 992                 ret = isert_connect_error(cma_id);
 993                 break;
 994         default:
 995                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
 996                 break;
 997         }
 998
 999         return ret;
1000 }
1001
1002 static int
1003 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
1004 {
1005         struct ib_recv_wr *rx_wr, *rx_wr_failed;
1006         int i, ret;
1007         struct iser_rx_desc *rx_desc;
1008
1009         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1010                 rx_desc = &isert_conn->rx_descs[i];
1011                 rx_wr->wr_id = (uintptr_t)rx_desc;
1012                 rx_wr->sg_list = &rx_desc->rx_sg;
1013                 rx_wr->num_sge = 1;
1014                 rx_wr->next = rx_wr + 1;
1015         }
1016         rx_wr--;
1017         rx_wr->next = NULL; /* mark end of work requests list */
1018
1019         isert_conn->post_recv_buf_count += count;
1020         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
1021                            &rx_wr_failed);
1022         if (ret) {
1023                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1024                 isert_conn->post_recv_buf_count -= count;
1025         }
1026
1027         return ret;
1028 }
1029
1030 static int
1031 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
1032 {
1033         struct ib_recv_wr *rx_wr_failed, rx_wr;
1034         int ret;
1035
1036         rx_wr.wr_id = (uintptr_t)rx_desc;
1037         rx_wr.sg_list = &rx_desc->rx_sg;
1038         rx_wr.num_sge = 1;
1039         rx_wr.next = NULL;
1040
1041         isert_conn->post_recv_buf_count++;
1042         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
1043         if (ret) {
1044                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1045                 isert_conn->post_recv_buf_count--;
1046         }
1047
1048         return ret;
1049 }
1050
1051 static int
1052 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1053 {
1054         struct ib_device *ib_dev = isert_conn->cm_id->device;
1055         struct ib_send_wr send_wr, *send_wr_failed;
1056         int ret;
1057
1058         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1059                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
1060
1061         send_wr.next    = NULL;
1062         send_wr.wr_id   = (uintptr_t)tx_desc;
1063         send_wr.sg_list = tx_desc->tx_sg;
1064         send_wr.num_sge = tx_desc->num_sge;
1065         send_wr.opcode  = IB_WR_SEND;
1066         send_wr.send_flags = IB_SEND_SIGNALED;
1067
1068         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1069         if (ret)
1070                 isert_err("ib_post_send() failed, ret: %d\n", ret);
1071
1072         return ret;
1073 }
1074
1075 static void
1076 isert_create_send_desc(struct isert_conn *isert_conn,
1077                        struct isert_cmd *isert_cmd,
1078                        struct iser_tx_desc *tx_desc)
1079 {
1080         struct isert_device *device = isert_conn->device;
1081         struct ib_device *ib_dev = device->ib_device;
1082
1083         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1084                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
1085
1086         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1087         tx_desc->iser_header.flags = ISER_VER;
1088
1089         tx_desc->num_sge = 1;
1090         tx_desc->isert_cmd = isert_cmd;
1091
1092         if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1093                 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1094                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1095         }
1096 }
1097
1098 static int
1099 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1100                    struct iser_tx_desc *tx_desc)
1101 {
1102         struct isert_device *device = isert_conn->device;
1103         struct ib_device *ib_dev = device->ib_device;
1104         u64 dma_addr;
1105
1106         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1107                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
1108         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1109                 isert_err("ib_dma_mapping_error() failed\n");
1110                 return -ENOMEM;
1111         }
1112
1113         tx_desc->dma_addr = dma_addr;
1114         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
1115         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1116         tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1117
1118         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1119                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1120                   tx_desc->tx_sg[0].lkey);
1121
1122         return 0;
1123 }
1124
1125 static void
1126 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1127                    struct ib_send_wr *send_wr)
1128 {
1129         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1130
1131         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1132         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1133         send_wr->opcode = IB_WR_SEND;
1134         send_wr->sg_list = &tx_desc->tx_sg[0];
1135         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1136         send_wr->send_flags = IB_SEND_SIGNALED;
1137 }
1138
1139 static int
1140 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1141 {
1142         struct ib_recv_wr rx_wr, *rx_wr_fail;
1143         struct ib_sge sge;
1144         int ret;
1145
1146         memset(&sge, 0, sizeof(struct ib_sge));
1147         sge.addr = isert_conn->login_req_dma;
1148         sge.length = ISER_RX_LOGIN_SIZE;
1149         sge.lkey = isert_conn->device->pd->local_dma_lkey;
1150
1151         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1152                 sge.addr, sge.length, sge.lkey);
1153
1154         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1155         rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1156         rx_wr.sg_list = &sge;
1157         rx_wr.num_sge = 1;
1158
1159         isert_conn->post_recv_buf_count++;
1160         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1161         if (ret) {
1162                 isert_err("ib_post_recv() failed: %d\n", ret);
1163                 isert_conn->post_recv_buf_count--;
1164         }
1165
1166         return ret;
1167 }
1168
1169 static int
1170 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1171                    u32 length)
1172 {
1173         struct isert_conn *isert_conn = conn->context;
1174         struct isert_device *device = isert_conn->device;
1175         struct ib_device *ib_dev = device->ib_device;
1176         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1177         int ret;
1178
1179         isert_create_send_desc(isert_conn, NULL, tx_desc);
1180
1181         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1182                sizeof(struct iscsi_hdr));
1183
1184         isert_init_tx_hdrs(isert_conn, tx_desc);
1185
1186         if (length > 0) {
1187                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1188
1189                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1190                                            length, DMA_TO_DEVICE);
1191
1192                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1193
1194                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1195                                               length, DMA_TO_DEVICE);
1196
1197                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1198                 tx_dsg->length  = length;
1199                 tx_dsg->lkey    = isert_conn->device->pd->local_dma_lkey;
1200                 tx_desc->num_sge = 2;
1201         }
1202         if (!login->login_failed) {
1203                 if (login->login_complete) {
1204                         if (!conn->sess->sess_ops->SessionType &&
1205                             isert_conn->device->use_fastreg) {
1206                                 ret = isert_conn_create_fastreg_pool(isert_conn);
1207                                 if (ret) {
1208                                         isert_err("Conn: %p failed to create"
1209                                                " fastreg pool\n", isert_conn);
1210                                         return ret;
1211                                 }
1212                         }
1213
1214                         ret = isert_alloc_rx_descriptors(isert_conn);
1215                         if (ret)
1216                                 return ret;
1217
1218                         ret = isert_post_recvm(isert_conn,
1219                                                ISERT_QP_MAX_RECV_DTOS);
1220                         if (ret)
1221                                 return ret;
1222
1223                         /* Now we are in FULL_FEATURE phase */
1224                         mutex_lock(&isert_conn->mutex);
1225                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1226                         mutex_unlock(&isert_conn->mutex);
1227                         goto post_send;
1228                 }
1229
1230                 ret = isert_rdma_post_recvl(isert_conn);
1231                 if (ret)
1232                         return ret;
1233         }
1234 post_send:
1235         ret = isert_post_send(isert_conn, tx_desc);
1236         if (ret)
1237                 return ret;
1238
1239         return 0;
1240 }
1241
1242 static void
1243 isert_rx_login_req(struct isert_conn *isert_conn)
1244 {
1245         struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1246         int rx_buflen = isert_conn->login_req_len;
1247         struct iscsi_conn *conn = isert_conn->conn;
1248         struct iscsi_login *login = conn->conn_login;
1249         int size;
1250
1251         isert_info("conn %p\n", isert_conn);
1252
1253         WARN_ON_ONCE(!login);
1254
1255         if (login->first_request) {
1256                 struct iscsi_login_req *login_req =
1257                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1258                 /*
1259                  * Setup the initial iscsi_login values from the leading
1260                  * login request PDU.
1261                  */
1262                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1263                 login->current_stage =
1264                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1265                          >> 2;
1266                 login->version_min      = login_req->min_version;
1267                 login->version_max      = login_req->max_version;
1268                 memcpy(login->isid, login_req->isid, 6);
1269                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1270                 login->init_task_tag    = login_req->itt;
1271                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1272                 login->cid              = be16_to_cpu(login_req->cid);
1273                 login->tsih             = be16_to_cpu(login_req->tsih);
1274         }
1275
1276         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1277
1278         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1279         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1280                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1281                   MAX_KEY_VALUE_PAIRS);
1282         memcpy(login->req_buf, &rx_desc->data[0], size);
1283
1284         if (login->first_request) {
1285                 complete(&isert_conn->login_comp);
1286                 return;
1287         }
1288         schedule_delayed_work(&conn->login_work, 0);
1289 }
1290
1291 static struct iscsi_cmd
1292 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1293 {
1294         struct isert_conn *isert_conn = conn->context;
1295         struct isert_cmd *isert_cmd;
1296         struct iscsi_cmd *cmd;
1297
1298         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1299         if (!cmd) {
1300                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1301                 return NULL;
1302         }
1303         isert_cmd = iscsit_priv_cmd(cmd);
1304         isert_cmd->conn = isert_conn;
1305         isert_cmd->iscsi_cmd = cmd;
1306         isert_cmd->rx_desc = rx_desc;
1307
1308         return cmd;
1309 }
1310
1311 static int
1312 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1313                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1314                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1315 {
1316         struct iscsi_conn *conn = isert_conn->conn;
1317         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1318         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1319         bool dump_payload = false;
1320         unsigned int data_len;
1321
1322         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1323         if (rc < 0)
1324                 return rc;
1325
1326         imm_data = cmd->immediate_data;
1327         imm_data_len = cmd->first_burst_len;
1328         unsol_data = cmd->unsolicited_data;
1329         data_len = cmd->se_cmd.data_length;
1330
1331         if (imm_data && imm_data_len == data_len)
1332                 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1333         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1334         if (rc < 0) {
1335                 return 0;
1336         } else if (rc > 0) {
1337                 dump_payload = true;
1338                 goto sequence_cmd;
1339         }
1340
1341         if (!imm_data)
1342                 return 0;
1343
1344         if (imm_data_len != data_len) {
1345                 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1346                 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1347                                     &rx_desc->data[0], imm_data_len);
1348                 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1349                           sg_nents, imm_data_len);
1350         } else {
1351                 sg_init_table(&isert_cmd->sg, 1);
1352                 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1353                 cmd->se_cmd.t_data_nents = 1;
1354                 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1355                 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1356                           imm_data_len);
1357         }
1358
1359         cmd->write_data_done += imm_data_len;
1360
1361         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1362                 spin_lock_bh(&cmd->istate_lock);
1363                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1364                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1365                 spin_unlock_bh(&cmd->istate_lock);
1366         }
1367
1368 sequence_cmd:
1369         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1370
1371         if (!rc && dump_payload == false && unsol_data)
1372                 iscsit_set_unsoliticed_dataout(cmd);
1373         else if (dump_payload && imm_data)
1374                 target_put_sess_cmd(&cmd->se_cmd);
1375
1376         return 0;
1377 }
1378
1379 static int
1380 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1381                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1382 {
1383         struct scatterlist *sg_start;
1384         struct iscsi_conn *conn = isert_conn->conn;
1385         struct iscsi_cmd *cmd = NULL;
1386         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1387         u32 unsol_data_len = ntoh24(hdr->dlength);
1388         int rc, sg_nents, sg_off, page_off;
1389
1390         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1391         if (rc < 0)
1392                 return rc;
1393         else if (!cmd)
1394                 return 0;
1395         /*
1396          * FIXME: Unexpected unsolicited_data out
1397          */
1398         if (!cmd->unsolicited_data) {
1399                 isert_err("Received unexpected solicited data payload\n");
1400                 dump_stack();
1401                 return -1;
1402         }
1403
1404         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1405                   "write_data_done: %u, data_length: %u\n",
1406                   unsol_data_len,  cmd->write_data_done,
1407                   cmd->se_cmd.data_length);
1408
1409         sg_off = cmd->write_data_done / PAGE_SIZE;
1410         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1411         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1412         page_off = cmd->write_data_done % PAGE_SIZE;
1413         /*
1414          * FIXME: Non page-aligned unsolicited_data out
1415          */
1416         if (page_off) {
1417                 isert_err("unexpected non-page aligned data payload\n");
1418                 dump_stack();
1419                 return -1;
1420         }
1421         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1422                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1423                   sg_nents, &rx_desc->data[0], unsol_data_len);
1424
1425         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1426                             unsol_data_len);
1427
1428         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1429         if (rc < 0)
1430                 return rc;
1431
1432         /*
1433          * multiple data-outs on the same command can arrive -
1434          * so post the buffer before hand
1435          */
1436         rc = isert_post_recv(isert_conn, rx_desc);
1437         if (rc) {
1438                 isert_err("ib_post_recv failed with %d\n", rc);
1439                 return rc;
1440         }
1441         return 0;
1442 }
1443
1444 static int
1445 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1446                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1447                      unsigned char *buf)
1448 {
1449         struct iscsi_conn *conn = isert_conn->conn;
1450         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1451         int rc;
1452
1453         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1454         if (rc < 0)
1455                 return rc;
1456         /*
1457          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1458          */
1459
1460         return iscsit_process_nop_out(conn, cmd, hdr);
1461 }
1462
1463 static int
1464 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1465                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1466                       struct iscsi_text *hdr)
1467 {
1468         struct iscsi_conn *conn = isert_conn->conn;
1469         u32 payload_length = ntoh24(hdr->dlength);
1470         int rc;
1471         unsigned char *text_in = NULL;
1472
1473         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1474         if (rc < 0)
1475                 return rc;
1476
1477         if (payload_length) {
1478                 text_in = kzalloc(payload_length, GFP_KERNEL);
1479                 if (!text_in) {
1480                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1481                                   payload_length);
1482                         return -ENOMEM;
1483                 }
1484         }
1485         cmd->text_in_ptr = text_in;
1486
1487         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1488
1489         return iscsit_process_text_cmd(conn, cmd, hdr);
1490 }
1491
1492 static int
1493 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1494                 uint32_t read_stag, uint64_t read_va,
1495                 uint32_t write_stag, uint64_t write_va)
1496 {
1497         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1498         struct iscsi_conn *conn = isert_conn->conn;
1499         struct iscsi_cmd *cmd;
1500         struct isert_cmd *isert_cmd;
1501         int ret = -EINVAL;
1502         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1503
1504         if (conn->sess->sess_ops->SessionType &&
1505            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1506                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1507                           " ignoring\n", opcode);
1508                 return 0;
1509         }
1510
1511         switch (opcode) {
1512         case ISCSI_OP_SCSI_CMD:
1513                 cmd = isert_allocate_cmd(conn, rx_desc);
1514                 if (!cmd)
1515                         break;
1516
1517                 isert_cmd = iscsit_priv_cmd(cmd);
1518                 isert_cmd->read_stag = read_stag;
1519                 isert_cmd->read_va = read_va;
1520                 isert_cmd->write_stag = write_stag;
1521                 isert_cmd->write_va = write_va;
1522
1523                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1524                                         rx_desc, (unsigned char *)hdr);
1525                 break;
1526         case ISCSI_OP_NOOP_OUT:
1527                 cmd = isert_allocate_cmd(conn, rx_desc);
1528                 if (!cmd)
1529                         break;
1530
1531                 isert_cmd = iscsit_priv_cmd(cmd);
1532                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1533                                            rx_desc, (unsigned char *)hdr);
1534                 break;
1535         case ISCSI_OP_SCSI_DATA_OUT:
1536                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1537                                                 (unsigned char *)hdr);
1538                 break;
1539         case ISCSI_OP_SCSI_TMFUNC:
1540                 cmd = isert_allocate_cmd(conn, rx_desc);
1541                 if (!cmd)
1542                         break;
1543
1544                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1545                                                 (unsigned char *)hdr);
1546                 break;
1547         case ISCSI_OP_LOGOUT:
1548                 cmd = isert_allocate_cmd(conn, rx_desc);
1549                 if (!cmd)
1550                         break;
1551
1552                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1553                 break;
1554         case ISCSI_OP_TEXT:
1555                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1556                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1557                 else
1558                         cmd = isert_allocate_cmd(conn, rx_desc);
1559
1560                 if (!cmd)
1561                         break;
1562
1563                 isert_cmd = iscsit_priv_cmd(cmd);
1564                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1565                                             rx_desc, (struct iscsi_text *)hdr);
1566                 break;
1567         default:
1568                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1569                 dump_stack();
1570                 break;
1571         }
1572
1573         return ret;
1574 }
1575
1576 static void
1577 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1578 {
1579         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1580         uint64_t read_va = 0, write_va = 0;
1581         uint32_t read_stag = 0, write_stag = 0;
1582         int rc;
1583
1584         switch (iser_hdr->flags & 0xF0) {
1585         case ISCSI_CTRL:
1586                 if (iser_hdr->flags & ISER_RSV) {
1587                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1588                         read_va = be64_to_cpu(iser_hdr->read_va);
1589                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1590                                   read_stag, (unsigned long long)read_va);
1591                 }
1592                 if (iser_hdr->flags & ISER_WSV) {
1593                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1594                         write_va = be64_to_cpu(iser_hdr->write_va);
1595                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1596                                   write_stag, (unsigned long long)write_va);
1597                 }
1598
1599                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1600                 break;
1601         case ISER_HELLO:
1602                 isert_err("iSER Hello message\n");
1603                 break;
1604         default:
1605                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1606                 break;
1607         }
1608
1609         rc = isert_rx_opcode(isert_conn, rx_desc,
1610                              read_stag, read_va, write_stag, write_va);
1611 }
1612
1613 static void
1614 isert_rcv_completion(struct iser_rx_desc *desc,
1615                      struct isert_conn *isert_conn,
1616                      u32 xfer_len)
1617 {
1618         struct ib_device *ib_dev = isert_conn->cm_id->device;
1619         struct iscsi_hdr *hdr;
1620         u64 rx_dma;
1621         int rx_buflen;
1622
1623         if ((char *)desc == isert_conn->login_req_buf) {
1624                 rx_dma = isert_conn->login_req_dma;
1625                 rx_buflen = ISER_RX_LOGIN_SIZE;
1626                 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1627                          rx_dma, rx_buflen);
1628         } else {
1629                 rx_dma = desc->dma_addr;
1630                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1631                 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1632                          rx_dma, rx_buflen);
1633         }
1634
1635         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1636
1637         hdr = &desc->iscsi_header;
1638         isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1639                  hdr->opcode, hdr->itt, hdr->flags,
1640                  (int)(xfer_len - ISER_HEADERS_LEN));
1641
1642         if ((char *)desc == isert_conn->login_req_buf) {
1643                 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1644                 if (isert_conn->conn) {
1645                         struct iscsi_login *login = isert_conn->conn->conn_login;
1646
1647                         if (login && !login->first_request)
1648                                 isert_rx_login_req(isert_conn);
1649                 }
1650                 mutex_lock(&isert_conn->mutex);
1651                 complete(&isert_conn->login_req_comp);
1652                 mutex_unlock(&isert_conn->mutex);
1653         } else {
1654                 isert_rx_do_work(desc, isert_conn);
1655         }
1656
1657         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1658                                       DMA_FROM_DEVICE);
1659
1660         isert_conn->post_recv_buf_count--;
1661 }
1662
1663 static int
1664 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1665                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1666                    enum iser_ib_op_code op, struct isert_data_buf *data)
1667 {
1668         struct ib_device *ib_dev = isert_conn->cm_id->device;
1669
1670         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1671                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1672
1673         data->len = length - offset;
1674         data->offset = offset;
1675         data->sg_off = data->offset / PAGE_SIZE;
1676
1677         data->sg = &sg[data->sg_off];
1678         data->nents = min_t(unsigned int, nents - data->sg_off,
1679                                           ISCSI_ISER_SG_TABLESIZE);
1680         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1681                                         PAGE_SIZE);
1682
1683         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1684                                         data->dma_dir);
1685         if (unlikely(!data->dma_nents)) {
1686                 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1687                 return -EINVAL;
1688         }
1689
1690         isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1691                   isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1692
1693         return 0;
1694 }
1695
1696 static void
1697 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1698 {
1699         struct ib_device *ib_dev = isert_conn->cm_id->device;
1700
1701         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1702         memset(data, 0, sizeof(*data));
1703 }
1704
1705
1706
1707 static void
1708 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1709 {
1710         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1711
1712         isert_dbg("Cmd %p\n", isert_cmd);
1713
1714         if (wr->data.sg) {
1715                 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1716                 isert_unmap_data_buf(isert_conn, &wr->data);
1717         }
1718
1719         if (wr->send_wr) {
1720                 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1721                 kfree(wr->send_wr);
1722                 wr->send_wr = NULL;
1723         }
1724
1725         if (wr->ib_sge) {
1726                 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1727                 kfree(wr->ib_sge);
1728                 wr->ib_sge = NULL;
1729         }
1730 }
1731
1732 static void
1733 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1734 {
1735         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1736
1737         isert_dbg("Cmd %p\n", isert_cmd);
1738
1739         if (wr->fr_desc) {
1740                 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1741                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1742                         isert_unmap_data_buf(isert_conn, &wr->prot);
1743                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1744                 }
1745                 spin_lock_bh(&isert_conn->pool_lock);
1746                 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1747                 spin_unlock_bh(&isert_conn->pool_lock);
1748                 wr->fr_desc = NULL;
1749         }
1750
1751         if (wr->data.sg) {
1752                 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1753                 isert_unmap_data_buf(isert_conn, &wr->data);
1754         }
1755
1756         wr->ib_sge = NULL;
1757         wr->send_wr = NULL;
1758 }
1759
1760 static void
1761 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1762 {
1763         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1764         struct isert_conn *isert_conn = isert_cmd->conn;
1765         struct iscsi_conn *conn = isert_conn->conn;
1766         struct isert_device *device = isert_conn->device;
1767         struct iscsi_text_rsp *hdr;
1768
1769         isert_dbg("Cmd %p\n", isert_cmd);
1770
1771         switch (cmd->iscsi_opcode) {
1772         case ISCSI_OP_SCSI_CMD:
1773                 spin_lock_bh(&conn->cmd_lock);
1774                 if (!list_empty(&cmd->i_conn_node))
1775                         list_del_init(&cmd->i_conn_node);
1776                 spin_unlock_bh(&conn->cmd_lock);
1777
1778                 if (cmd->data_direction == DMA_TO_DEVICE) {
1779                         iscsit_stop_dataout_timer(cmd);
1780                         /*
1781                          * Check for special case during comp_err where
1782                          * WRITE_PENDING has been handed off from core,
1783                          * but requires an extra target_put_sess_cmd()
1784                          * before transport_generic_free_cmd() below.
1785                          */
1786                         if (comp_err &&
1787                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1788                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1789
1790                                 target_put_sess_cmd(se_cmd);
1791                         }
1792                 }
1793
1794                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1795                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1796                 break;
1797         case ISCSI_OP_SCSI_TMFUNC:
1798                 spin_lock_bh(&conn->cmd_lock);
1799                 if (!list_empty(&cmd->i_conn_node))
1800                         list_del_init(&cmd->i_conn_node);
1801                 spin_unlock_bh(&conn->cmd_lock);
1802
1803                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1804                 break;
1805         case ISCSI_OP_REJECT:
1806         case ISCSI_OP_NOOP_OUT:
1807         case ISCSI_OP_TEXT:
1808                 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1809                 /* If the continue bit is on, keep the command alive */
1810                 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1811                         break;
1812
1813                 spin_lock_bh(&conn->cmd_lock);
1814                 if (!list_empty(&cmd->i_conn_node))
1815                         list_del_init(&cmd->i_conn_node);
1816                 spin_unlock_bh(&conn->cmd_lock);
1817
1818                 /*
1819                  * Handle special case for REJECT when iscsi_add_reject*() has
1820                  * overwritten the original iscsi_opcode assignment, and the
1821                  * associated cmd->se_cmd needs to be released.
1822                  */
1823                 if (cmd->se_cmd.se_tfo != NULL) {
1824                         isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1825                                  cmd->iscsi_opcode);
1826                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1827                         break;
1828                 }
1829                 /*
1830                  * Fall-through
1831                  */
1832         default:
1833                 iscsit_release_cmd(cmd);
1834                 break;
1835         }
1836 }
1837
1838 static void
1839 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1840 {
1841         if (tx_desc->dma_addr != 0) {
1842                 isert_dbg("unmap single for tx_desc->dma_addr\n");
1843                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1844                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1845                 tx_desc->dma_addr = 0;
1846         }
1847 }
1848
1849 static void
1850 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1851                      struct ib_device *ib_dev, bool comp_err)
1852 {
1853         if (isert_cmd->pdu_buf_dma != 0) {
1854                 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1855                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1856                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1857                 isert_cmd->pdu_buf_dma = 0;
1858         }
1859
1860         isert_unmap_tx_desc(tx_desc, ib_dev);
1861         isert_put_cmd(isert_cmd, comp_err);
1862 }
1863
1864 static int
1865 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1866 {
1867         struct ib_mr_status mr_status;
1868         int ret;
1869
1870         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1871         if (ret) {
1872                 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1873                 goto fail_mr_status;
1874         }
1875
1876         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1877                 u64 sec_offset_err;
1878                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1879
1880                 switch (mr_status.sig_err.err_type) {
1881                 case IB_SIG_BAD_GUARD:
1882                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1883                         break;
1884                 case IB_SIG_BAD_REFTAG:
1885                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1886                         break;
1887                 case IB_SIG_BAD_APPTAG:
1888                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1889                         break;
1890                 }
1891                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1892                 do_div(sec_offset_err, block_size);
1893                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1894
1895                 isert_err("PI error found type %d at sector 0x%llx "
1896                           "expected 0x%x vs actual 0x%x\n",
1897                           mr_status.sig_err.err_type,
1898                           (unsigned long long)se_cmd->bad_sector,
1899                           mr_status.sig_err.expected,
1900                           mr_status.sig_err.actual);
1901                 ret = 1;
1902         }
1903
1904 fail_mr_status:
1905         return ret;
1906 }
1907
1908 static void
1909 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1910                             struct isert_cmd *isert_cmd)
1911 {
1912         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1913         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1914         struct se_cmd *se_cmd = &cmd->se_cmd;
1915         struct isert_conn *isert_conn = isert_cmd->conn;
1916         struct isert_device *device = isert_conn->device;
1917         int ret = 0;
1918
1919         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1920                 ret = isert_check_pi_status(se_cmd,
1921                                             wr->fr_desc->pi_ctx->sig_mr);
1922                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1923         }
1924
1925         device->unreg_rdma_mem(isert_cmd, isert_conn);
1926         wr->send_wr_num = 0;
1927         if (ret)
1928                 transport_send_check_condition_and_sense(se_cmd,
1929                                                          se_cmd->pi_err, 0);
1930         else
1931                 isert_put_response(isert_conn->conn, cmd);
1932 }
1933
1934 static void
1935 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1936                            struct isert_cmd *isert_cmd)
1937 {
1938         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1939         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1940         struct se_cmd *se_cmd = &cmd->se_cmd;
1941         struct isert_conn *isert_conn = isert_cmd->conn;
1942         struct isert_device *device = isert_conn->device;
1943         int ret = 0;
1944
1945         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1946                 ret = isert_check_pi_status(se_cmd,
1947                                             wr->fr_desc->pi_ctx->sig_mr);
1948                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1949         }
1950
1951         iscsit_stop_dataout_timer(cmd);
1952         device->unreg_rdma_mem(isert_cmd, isert_conn);
1953         cmd->write_data_done = wr->data.len;
1954         wr->send_wr_num = 0;
1955
1956         isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1957         spin_lock_bh(&cmd->istate_lock);
1958         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1959         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1960         spin_unlock_bh(&cmd->istate_lock);
1961
1962         if (ret) {
1963                 target_put_sess_cmd(se_cmd);
1964                 transport_send_check_condition_and_sense(se_cmd,
1965                                                          se_cmd->pi_err, 0);
1966         } else {
1967                 target_execute_cmd(se_cmd);
1968         }
1969 }
1970
1971 static void
1972 isert_do_control_comp(struct work_struct *work)
1973 {
1974         struct isert_cmd *isert_cmd = container_of(work,
1975                         struct isert_cmd, comp_work);
1976         struct isert_conn *isert_conn = isert_cmd->conn;
1977         struct ib_device *ib_dev = isert_conn->cm_id->device;
1978         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1979
1980         isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1981
1982         switch (cmd->i_state) {
1983         case ISTATE_SEND_TASKMGTRSP:
1984                 iscsit_tmr_post_handler(cmd, cmd->conn);
1985         case ISTATE_SEND_REJECT:   /* FALLTHRU */
1986         case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
1987                 cmd->i_state = ISTATE_SENT_STATUS;
1988                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1989                                      ib_dev, false);
1990                 break;
1991         case ISTATE_SEND_LOGOUTRSP:
1992                 iscsit_logout_post_handler(cmd, cmd->conn);
1993                 break;
1994         default:
1995                 isert_err("Unknown i_state %d\n", cmd->i_state);
1996                 dump_stack();
1997                 break;
1998         }
1999 }
2000
2001 static void
2002 isert_response_completion(struct iser_tx_desc *tx_desc,
2003                           struct isert_cmd *isert_cmd,
2004                           struct isert_conn *isert_conn,
2005                           struct ib_device *ib_dev)
2006 {
2007         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2008
2009         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
2010             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
2011             cmd->i_state == ISTATE_SEND_REJECT ||
2012             cmd->i_state == ISTATE_SEND_TEXTRSP) {
2013                 isert_unmap_tx_desc(tx_desc, ib_dev);
2014
2015                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2016                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2017                 return;
2018         }
2019
2020         cmd->i_state = ISTATE_SENT_STATUS;
2021         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2022 }
2023
2024 static void
2025 isert_snd_completion(struct iser_tx_desc *tx_desc,
2026                       struct isert_conn *isert_conn)
2027 {
2028         struct ib_device *ib_dev = isert_conn->cm_id->device;
2029         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2030         struct isert_rdma_wr *wr;
2031
2032         if (!isert_cmd) {
2033                 isert_unmap_tx_desc(tx_desc, ib_dev);
2034                 return;
2035         }
2036         wr = &isert_cmd->rdma_wr;
2037
2038         isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2039
2040         switch (wr->iser_ib_op) {
2041         case ISER_IB_SEND:
2042                 isert_response_completion(tx_desc, isert_cmd,
2043                                           isert_conn, ib_dev);
2044                 break;
2045         case ISER_IB_RDMA_WRITE:
2046                 isert_completion_rdma_write(tx_desc, isert_cmd);
2047                 break;
2048         case ISER_IB_RDMA_READ:
2049                 isert_completion_rdma_read(tx_desc, isert_cmd);
2050                 break;
2051         default:
2052                 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2053                 dump_stack();
2054                 break;
2055         }
2056 }
2057
2058 /**
2059  * is_isert_tx_desc() - Indicate if the completion wr_id
2060  *     is a TX descriptor or not.
2061  * @isert_conn: iser connection
2062  * @wr_id: completion WR identifier
2063  *
2064  * Since we cannot rely on wc opcode in FLUSH errors
2065  * we must work around it by checking if the wr_id address
2066  * falls in the iser connection rx_descs buffer. If so
2067  * it is an RX descriptor, otherwize it is a TX.
2068  */
2069 static inline bool
2070 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2071 {
2072         void *start = isert_conn->rx_descs;
2073         int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2074
2075         if (wr_id >= start && wr_id < start + len)
2076                 return false;
2077
2078         return true;
2079 }
2080
2081 static void
2082 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2083 {
2084         if (wc->wr_id == ISER_BEACON_WRID) {
2085                 isert_info("conn %p completing wait_comp_err\n",
2086                            isert_conn);
2087                 complete(&isert_conn->wait_comp_err);
2088         } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2089                 struct ib_device *ib_dev = isert_conn->cm_id->device;
2090                 struct isert_cmd *isert_cmd;
2091                 struct iser_tx_desc *desc;
2092
2093                 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2094                 isert_cmd = desc->isert_cmd;
2095                 if (!isert_cmd)
2096                         isert_unmap_tx_desc(desc, ib_dev);
2097                 else
2098                         isert_completion_put(desc, isert_cmd, ib_dev, true);
2099         } else {
2100                 isert_conn->post_recv_buf_count--;
2101                 if (!isert_conn->post_recv_buf_count)
2102                         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2103         }
2104 }
2105
2106 static void
2107 isert_handle_wc(struct ib_wc *wc)
2108 {
2109         struct isert_conn *isert_conn;
2110         struct iser_tx_desc *tx_desc;
2111         struct iser_rx_desc *rx_desc;
2112
2113         isert_conn = wc->qp->qp_context;
2114         if (likely(wc->status == IB_WC_SUCCESS)) {
2115                 if (wc->opcode == IB_WC_RECV) {
2116                         rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2117                         isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2118                 } else {
2119                         tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2120                         isert_snd_completion(tx_desc, isert_conn);
2121                 }
2122         } else {
2123                 if (wc->status != IB_WC_WR_FLUSH_ERR)
2124                         isert_err("%s (%d): wr id %llx vend_err %x\n",
2125                                   ib_wc_status_msg(wc->status), wc->status,
2126                                   wc->wr_id, wc->vendor_err);
2127                 else
2128                         isert_dbg("%s (%d): wr id %llx\n",
2129                                   ib_wc_status_msg(wc->status), wc->status,
2130                                   wc->wr_id);
2131
2132                 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2133                         isert_cq_comp_err(isert_conn, wc);
2134         }
2135 }
2136
2137 static void
2138 isert_cq_work(struct work_struct *work)
2139 {
2140         enum { isert_poll_budget = 65536 };
2141         struct isert_comp *comp = container_of(work, struct isert_comp,
2142                                                work);
2143         struct ib_wc *const wcs = comp->wcs;
2144         int i, n, completed = 0;
2145
2146         while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2147                 for (i = 0; i < n; i++)
2148                         isert_handle_wc(&wcs[i]);
2149
2150                 completed += n;
2151                 if (completed >= isert_poll_budget)
2152                         break;
2153         }
2154
2155         ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2156 }
2157
2158 static void
2159 isert_cq_callback(struct ib_cq *cq, void *context)
2160 {
2161         struct isert_comp *comp = context;
2162
2163         queue_work(isert_comp_wq, &comp->work);
2164 }
2165
2166 static int
2167 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2168 {
2169         struct ib_send_wr *wr_failed;
2170         int ret;
2171
2172         ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2173         if (ret) {
2174                 isert_err("ib_post_recv failed with %d\n", ret);
2175                 return ret;
2176         }
2177
2178         ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2179                            &wr_failed);
2180         if (ret) {
2181                 isert_err("ib_post_send failed with %d\n", ret);
2182                 return ret;
2183         }
2184         return ret;
2185 }
2186
2187 static int
2188 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2189 {
2190         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2191         struct isert_conn *isert_conn = conn->context;
2192         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2193         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2194                                 &isert_cmd->tx_desc.iscsi_header;
2195
2196         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2197         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2198         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2199         /*
2200          * Attach SENSE DATA payload to iSCSI Response PDU
2201          */
2202         if (cmd->se_cmd.sense_buffer &&
2203             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2204             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2205                 struct isert_device *device = isert_conn->device;
2206                 struct ib_device *ib_dev = device->ib_device;
2207                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2208                 u32 padding, pdu_len;
2209
2210                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2211                                    cmd->sense_buffer);
2212                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2213
2214                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2215                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2216                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2217
2218                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2219                                 (void *)cmd->sense_buffer, pdu_len,
2220                                 DMA_TO_DEVICE);
2221
2222                 isert_cmd->pdu_buf_len = pdu_len;
2223                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2224                 tx_dsg->length  = pdu_len;
2225                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2226                 isert_cmd->tx_desc.num_sge = 2;
2227         }
2228
2229         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2230
2231         isert_dbg("Posting SCSI Response\n");
2232
2233         return isert_post_response(isert_conn, isert_cmd);
2234 }
2235
2236 static void
2237 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2238 {
2239         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2240         struct isert_conn *isert_conn = conn->context;
2241         struct isert_device *device = isert_conn->device;
2242
2243         spin_lock_bh(&conn->cmd_lock);
2244         if (!list_empty(&cmd->i_conn_node))
2245                 list_del_init(&cmd->i_conn_node);
2246         spin_unlock_bh(&conn->cmd_lock);
2247
2248         if (cmd->data_direction == DMA_TO_DEVICE)
2249                 iscsit_stop_dataout_timer(cmd);
2250
2251         device->unreg_rdma_mem(isert_cmd, isert_conn);
2252 }
2253
2254 static enum target_prot_op
2255 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2256 {
2257         struct isert_conn *isert_conn = conn->context;
2258         struct isert_device *device = isert_conn->device;
2259
2260         if (conn->tpg->tpg_attrib.t10_pi) {
2261                 if (device->pi_capable) {
2262                         isert_info("conn %p PI offload enabled\n", isert_conn);
2263                         isert_conn->pi_support = true;
2264                         return TARGET_PROT_ALL;
2265                 }
2266         }
2267
2268         isert_info("conn %p PI offload disabled\n", isert_conn);
2269         isert_conn->pi_support = false;
2270
2271         return TARGET_PROT_NORMAL;
2272 }
2273
2274 static int
2275 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2276                 bool nopout_response)
2277 {
2278         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2279         struct isert_conn *isert_conn = conn->context;
2280         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2281
2282         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2283         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2284                                &isert_cmd->tx_desc.iscsi_header,
2285                                nopout_response);
2286         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2287         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2288
2289         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2290
2291         return isert_post_response(isert_conn, isert_cmd);
2292 }
2293
2294 static int
2295 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2296 {
2297         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2298         struct isert_conn *isert_conn = conn->context;
2299         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2300
2301         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2302         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2303                                 &isert_cmd->tx_desc.iscsi_header);
2304         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2305         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2306
2307         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2308
2309         return isert_post_response(isert_conn, isert_cmd);
2310 }
2311
2312 static int
2313 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2314 {
2315         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2316         struct isert_conn *isert_conn = conn->context;
2317         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2318
2319         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2320         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2321                                   &isert_cmd->tx_desc.iscsi_header);
2322         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2323         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2324
2325         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2326
2327         return isert_post_response(isert_conn, isert_cmd);
2328 }
2329
2330 static int
2331 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2332 {
2333         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2334         struct isert_conn *isert_conn = conn->context;
2335         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2336         struct isert_device *device = isert_conn->device;
2337         struct ib_device *ib_dev = device->ib_device;
2338         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2339         struct iscsi_reject *hdr =
2340                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2341
2342         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2343         iscsit_build_reject(cmd, conn, hdr);
2344         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2345
2346         hton24(hdr->dlength, ISCSI_HDR_LEN);
2347         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2348                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2349                         DMA_TO_DEVICE);
2350         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2351         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2352         tx_dsg->length  = ISCSI_HDR_LEN;
2353         tx_dsg->lkey    = device->pd->local_dma_lkey;
2354         isert_cmd->tx_desc.num_sge = 2;
2355
2356         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2357
2358         isert_dbg("conn %p Posting Reject\n", isert_conn);
2359
2360         return isert_post_response(isert_conn, isert_cmd);
2361 }
2362
2363 static int
2364 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2365 {
2366         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2367         struct isert_conn *isert_conn = conn->context;
2368         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2369         struct iscsi_text_rsp *hdr =
2370                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2371         u32 txt_rsp_len;
2372         int rc;
2373
2374         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2375         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2376         if (rc < 0)
2377                 return rc;
2378
2379         txt_rsp_len = rc;
2380         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2381
2382         if (txt_rsp_len) {
2383                 struct isert_device *device = isert_conn->device;
2384                 struct ib_device *ib_dev = device->ib_device;
2385                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2386                 void *txt_rsp_buf = cmd->buf_ptr;
2387
2388                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2389                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2390
2391                 isert_cmd->pdu_buf_len = txt_rsp_len;
2392                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2393                 tx_dsg->length  = txt_rsp_len;
2394                 tx_dsg->lkey    = device->pd->local_dma_lkey;
2395                 isert_cmd->tx_desc.num_sge = 2;
2396         }
2397         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2398
2399         isert_dbg("conn %p Text Response\n", isert_conn);
2400
2401         return isert_post_response(isert_conn, isert_cmd);
2402 }
2403
2404 static int
2405 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2406                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2407                     u32 data_left, u32 offset)
2408 {
2409         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2410         struct scatterlist *sg_start, *tmp_sg;
2411         struct isert_device *device = isert_conn->device;
2412         struct ib_device *ib_dev = device->ib_device;
2413         u32 sg_off, page_off;
2414         int i = 0, sg_nents;
2415
2416         sg_off = offset / PAGE_SIZE;
2417         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2418         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2419         page_off = offset % PAGE_SIZE;
2420
2421         send_wr->sg_list = ib_sge;
2422         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2423         /*
2424          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2425          */
2426         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2427                 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2428                           "page_off: %u\n",
2429                           (unsigned long long)tmp_sg->dma_address,
2430                           tmp_sg->length, page_off);
2431
2432                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2433                 ib_sge->length = min_t(u32, data_left,
2434                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2435                 ib_sge->lkey = device->pd->local_dma_lkey;
2436
2437                 isert_dbg("RDMA ib_sge: addr: 0x%llx  length: %u lkey: %x\n",
2438                           ib_sge->addr, ib_sge->length, ib_sge->lkey);
2439                 page_off = 0;
2440                 data_left -= ib_sge->length;
2441                 if (!data_left)
2442                         break;
2443                 ib_sge++;
2444                 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2445         }
2446
2447         send_wr->num_sge = ++i;
2448         isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2449                   send_wr->sg_list, send_wr->num_sge);
2450
2451         return send_wr->num_sge;
2452 }
2453
2454 static int
2455 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2456                struct isert_rdma_wr *wr)
2457 {
2458         struct se_cmd *se_cmd = &cmd->se_cmd;
2459         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2460         struct isert_conn *isert_conn = conn->context;
2461         struct isert_data_buf *data = &wr->data;
2462         struct ib_send_wr *send_wr;
2463         struct ib_sge *ib_sge;
2464         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2465         int ret = 0, i, ib_sge_cnt;
2466
2467         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2468
2469         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2470         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2471                                  se_cmd->t_data_nents, se_cmd->data_length,
2472                                  offset, wr->iser_ib_op, &wr->data);
2473         if (ret)
2474                 return ret;
2475
2476         data_left = data->len;
2477         offset = data->offset;
2478
2479         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2480         if (!ib_sge) {
2481                 isert_warn("Unable to allocate ib_sge\n");
2482                 ret = -ENOMEM;
2483                 goto unmap_cmd;
2484         }
2485         wr->ib_sge = ib_sge;
2486
2487         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2488         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2489                                 GFP_KERNEL);
2490         if (!wr->send_wr) {
2491                 isert_dbg("Unable to allocate wr->send_wr\n");
2492                 ret = -ENOMEM;
2493                 goto unmap_cmd;
2494         }
2495
2496         wr->isert_cmd = isert_cmd;
2497         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2498
2499         for (i = 0; i < wr->send_wr_num; i++) {
2500                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2501                 data_len = min(data_left, rdma_write_max);
2502
2503                 send_wr->send_flags = 0;
2504                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2505                         send_wr->opcode = IB_WR_RDMA_WRITE;
2506                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2507                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2508                         if (i + 1 == wr->send_wr_num)
2509                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2510                         else
2511                                 send_wr->next = &wr->send_wr[i + 1];
2512                 } else {
2513                         send_wr->opcode = IB_WR_RDMA_READ;
2514                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2515                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2516                         if (i + 1 == wr->send_wr_num)
2517                                 send_wr->send_flags = IB_SEND_SIGNALED;
2518                         else
2519                                 send_wr->next = &wr->send_wr[i + 1];
2520                 }
2521
2522                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2523                                         send_wr, data_len, offset);
2524                 ib_sge += ib_sge_cnt;
2525
2526                 offset += data_len;
2527                 va_offset += data_len;
2528                 data_left -= data_len;
2529         }
2530
2531         return 0;
2532 unmap_cmd:
2533         isert_unmap_data_buf(isert_conn, data);
2534
2535         return ret;
2536 }
2537
2538 static int
2539 isert_map_fr_pagelist(struct ib_device *ib_dev,
2540                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2541 {
2542         u64 start_addr, end_addr, page, chunk_start = 0;
2543         struct scatterlist *tmp_sg;
2544         int i = 0, new_chunk, last_ent, n_pages;
2545
2546         n_pages = 0;
2547         new_chunk = 1;
2548         last_ent = sg_nents - 1;
2549         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2550                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2551                 if (new_chunk)
2552                         chunk_start = start_addr;
2553                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2554
2555                 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
2556                           i, (unsigned long long)tmp_sg->dma_address,
2557                           tmp_sg->length);
2558
2559                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2560                         new_chunk = 0;
2561                         continue;
2562                 }
2563                 new_chunk = 1;
2564
2565                 page = chunk_start & PAGE_MASK;
2566                 do {
2567                         fr_pl[n_pages++] = page;
2568                         isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
2569                                   n_pages - 1, page);
2570                         page += PAGE_SIZE;
2571                 } while (page < end_addr);
2572         }
2573
2574         return n_pages;
2575 }
2576
2577 static inline void
2578 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2579 {
2580         u32 rkey;
2581
2582         memset(inv_wr, 0, sizeof(*inv_wr));
2583         inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2584         inv_wr->opcode = IB_WR_LOCAL_INV;
2585         inv_wr->ex.invalidate_rkey = mr->rkey;
2586
2587         /* Bump the key */
2588         rkey = ib_inc_rkey(mr->rkey);
2589         ib_update_fast_reg_key(mr, rkey);
2590 }
2591
2592 static int
2593 isert_fast_reg_mr(struct isert_conn *isert_conn,
2594                   struct fast_reg_descriptor *fr_desc,
2595                   struct isert_data_buf *mem,
2596                   enum isert_indicator ind,
2597                   struct ib_sge *sge)
2598 {
2599         struct isert_device *device = isert_conn->device;
2600         struct ib_device *ib_dev = device->ib_device;
2601         struct ib_mr *mr;
2602         struct ib_fast_reg_page_list *frpl;
2603         struct ib_send_wr fr_wr, inv_wr;
2604         struct ib_send_wr *bad_wr, *wr = NULL;
2605         int ret, pagelist_len;
2606         u32 page_off;
2607
2608         if (mem->dma_nents == 1) {
2609                 sge->lkey = device->pd->local_dma_lkey;
2610                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2611                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2612                 isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2613                          sge->addr, sge->length, sge->lkey);
2614                 return 0;
2615         }
2616
2617         if (ind == ISERT_DATA_KEY_VALID) {
2618                 /* Registering data buffer */
2619                 mr = fr_desc->data_mr;
2620                 frpl = fr_desc->data_frpl;
2621         } else {
2622                 /* Registering protection buffer */
2623                 mr = fr_desc->pi_ctx->prot_mr;
2624                 frpl = fr_desc->pi_ctx->prot_frpl;
2625         }
2626
2627         page_off = mem->offset % PAGE_SIZE;
2628
2629         isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2630                   fr_desc, mem->nents, mem->offset);
2631
2632         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2633                                              &frpl->page_list[0]);
2634
2635         if (!(fr_desc->ind & ind)) {
2636                 isert_inv_rkey(&inv_wr, mr);
2637                 wr = &inv_wr;
2638         }
2639
2640         /* Prepare FASTREG WR */
2641         memset(&fr_wr, 0, sizeof(fr_wr));
2642         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2643         fr_wr.opcode = IB_WR_FAST_REG_MR;
2644         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2645         fr_wr.wr.fast_reg.page_list = frpl;
2646         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2647         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2648         fr_wr.wr.fast_reg.length = mem->len;
2649         fr_wr.wr.fast_reg.rkey = mr->rkey;
2650         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2651
2652         if (!wr)
2653                 wr = &fr_wr;
2654         else
2655                 wr->next = &fr_wr;
2656
2657         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2658         if (ret) {
2659                 isert_err("fast registration failed, ret:%d\n", ret);
2660                 return ret;
2661         }
2662         fr_desc->ind &= ~ind;
2663
2664         sge->lkey = mr->lkey;
2665         sge->addr = frpl->page_list[0] + page_off;
2666         sge->length = mem->len;
2667
2668         isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2669                   sge->addr, sge->length, sge->lkey);
2670
2671         return ret;
2672 }
2673
2674 static inline void
2675 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2676                      struct ib_sig_domain *domain)
2677 {
2678         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2679         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2680         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2681         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2682         /*
2683          * At the moment we hard code those, but if in the future
2684          * the target core would like to use it, we will take it
2685          * from se_cmd.
2686          */
2687         domain->sig.dif.apptag_check_mask = 0xffff;
2688         domain->sig.dif.app_escape = true;
2689         domain->sig.dif.ref_escape = true;
2690         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2691             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2692                 domain->sig.dif.ref_remap = true;
2693 };
2694
2695 static int
2696 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2697 {
2698         switch (se_cmd->prot_op) {
2699         case TARGET_PROT_DIN_INSERT:
2700         case TARGET_PROT_DOUT_STRIP:
2701                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2702                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2703                 break;
2704         case TARGET_PROT_DOUT_INSERT:
2705         case TARGET_PROT_DIN_STRIP:
2706                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2707                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2708                 break;
2709         case TARGET_PROT_DIN_PASS:
2710         case TARGET_PROT_DOUT_PASS:
2711                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2712                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2713                 break;
2714         default:
2715                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2716                 return -EINVAL;
2717         }
2718
2719         return 0;
2720 }
2721
2722 static inline u8
2723 isert_set_prot_checks(u8 prot_checks)
2724 {
2725         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2726                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2727                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2728 }
2729
2730 static int
2731 isert_reg_sig_mr(struct isert_conn *isert_conn,
2732                  struct se_cmd *se_cmd,
2733                  struct isert_rdma_wr *rdma_wr,
2734                  struct fast_reg_descriptor *fr_desc)
2735 {
2736         struct ib_send_wr sig_wr, inv_wr;
2737         struct ib_send_wr *bad_wr, *wr = NULL;
2738         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2739         struct ib_sig_attrs sig_attrs;
2740         int ret;
2741
2742         memset(&sig_attrs, 0, sizeof(sig_attrs));
2743         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2744         if (ret)
2745                 goto err;
2746
2747         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2748
2749         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2750                 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2751                 wr = &inv_wr;
2752         }
2753
2754         memset(&sig_wr, 0, sizeof(sig_wr));
2755         sig_wr.opcode = IB_WR_REG_SIG_MR;
2756         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2757         sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2758         sig_wr.num_sge = 1;
2759         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2760         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2761         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2762         if (se_cmd->t_prot_sg)
2763                 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2764
2765         if (!wr)
2766                 wr = &sig_wr;
2767         else
2768                 wr->next = &sig_wr;
2769
2770         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2771         if (ret) {
2772                 isert_err("fast registration failed, ret:%d\n", ret);
2773                 goto err;
2774         }
2775         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2776
2777         rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2778         rdma_wr->ib_sg[SIG].addr = 0;
2779         rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2780         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2781             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2782                 /*
2783                  * We have protection guards on the wire
2784                  * so we need to set a larget transfer
2785                  */
2786                 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2787
2788         isert_dbg("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2789                   rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2790                   rdma_wr->ib_sg[SIG].lkey);
2791 err:
2792         return ret;
2793 }
2794
2795 static int
2796 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2797                       struct isert_cmd *isert_cmd,
2798                       struct isert_rdma_wr *wr)
2799 {
2800         struct isert_device *device = isert_conn->device;
2801         struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2802         int ret;
2803
2804         if (!wr->fr_desc->pi_ctx) {
2805                 ret = isert_create_pi_ctx(wr->fr_desc,
2806                                           device->ib_device,
2807                                           device->pd);
2808                 if (ret) {
2809                         isert_err("conn %p failed to allocate pi_ctx\n",
2810                                   isert_conn);
2811                         return ret;
2812                 }
2813         }
2814
2815         if (se_cmd->t_prot_sg) {
2816                 ret = isert_map_data_buf(isert_conn, isert_cmd,
2817                                          se_cmd->t_prot_sg,
2818                                          se_cmd->t_prot_nents,
2819                                          se_cmd->prot_length,
2820                                          0, wr->iser_ib_op, &wr->prot);
2821                 if (ret) {
2822                         isert_err("conn %p failed to map protection buffer\n",
2823                                   isert_conn);
2824                         return ret;
2825                 }
2826
2827                 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2828                 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2829                                         ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2830                 if (ret) {
2831                         isert_err("conn %p failed to fast reg mr\n",
2832                                   isert_conn);
2833                         goto unmap_prot_cmd;
2834                 }
2835         }
2836
2837         ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2838         if (ret) {
2839                 isert_err("conn %p failed to fast reg mr\n",
2840                           isert_conn);
2841                 goto unmap_prot_cmd;
2842         }
2843         wr->fr_desc->ind |= ISERT_PROTECTED;
2844
2845         return 0;
2846
2847 unmap_prot_cmd:
2848         if (se_cmd->t_prot_sg)
2849                 isert_unmap_data_buf(isert_conn, &wr->prot);
2850
2851         return ret;
2852 }
2853
2854 static int
2855 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2856                struct isert_rdma_wr *wr)
2857 {
2858         struct se_cmd *se_cmd = &cmd->se_cmd;
2859         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2860         struct isert_conn *isert_conn = conn->context;
2861         struct fast_reg_descriptor *fr_desc = NULL;
2862         struct ib_send_wr *send_wr;
2863         struct ib_sge *ib_sg;
2864         u32 offset;
2865         int ret = 0;
2866         unsigned long flags;
2867
2868         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2869
2870         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2871         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2872                                  se_cmd->t_data_nents, se_cmd->data_length,
2873                                  offset, wr->iser_ib_op, &wr->data);
2874         if (ret)
2875                 return ret;
2876
2877         if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2878                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2879                 fr_desc = list_first_entry(&isert_conn->fr_pool,
2880                                            struct fast_reg_descriptor, list);
2881                 list_del(&fr_desc->list);
2882                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2883                 wr->fr_desc = fr_desc;
2884         }
2885
2886         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2887                                 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2888         if (ret)
2889                 goto unmap_cmd;
2890
2891         if (isert_prot_cmd(isert_conn, se_cmd)) {
2892                 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2893                 if (ret)
2894                         goto unmap_cmd;
2895
2896                 ib_sg = &wr->ib_sg[SIG];
2897         } else {
2898                 ib_sg = &wr->ib_sg[DATA];
2899         }
2900
2901         memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2902         wr->ib_sge = &wr->s_ib_sge;
2903         wr->send_wr_num = 1;
2904         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2905         wr->send_wr = &wr->s_send_wr;
2906         wr->isert_cmd = isert_cmd;
2907
2908         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2909         send_wr->sg_list = &wr->s_ib_sge;
2910         send_wr->num_sge = 1;
2911         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2912         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2913                 send_wr->opcode = IB_WR_RDMA_WRITE;
2914                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2915                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2916                 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2917                                       0 : IB_SEND_SIGNALED;
2918         } else {
2919                 send_wr->opcode = IB_WR_RDMA_READ;
2920                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2921                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2922                 send_wr->send_flags = IB_SEND_SIGNALED;
2923         }
2924
2925         return 0;
2926
2927 unmap_cmd:
2928         if (fr_desc) {
2929                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2930                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2931                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2932         }
2933         isert_unmap_data_buf(isert_conn, &wr->data);
2934
2935         return ret;
2936 }
2937
2938 static int
2939 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2940 {
2941         struct se_cmd *se_cmd = &cmd->se_cmd;
2942         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2943         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2944         struct isert_conn *isert_conn = conn->context;
2945         struct isert_device *device = isert_conn->device;
2946         struct ib_send_wr *wr_failed;
2947         int rc;
2948
2949         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2950                  isert_cmd, se_cmd->data_length);
2951
2952         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2953         rc = device->reg_rdma_mem(conn, cmd, wr);
2954         if (rc) {
2955                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2956                 return rc;
2957         }
2958
2959         if (!isert_prot_cmd(isert_conn, se_cmd)) {
2960                 /*
2961                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2962                  */
2963                 isert_create_send_desc(isert_conn, isert_cmd,
2964                                        &isert_cmd->tx_desc);
2965                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2966                                      &isert_cmd->tx_desc.iscsi_header);
2967                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2968                 isert_init_send_wr(isert_conn, isert_cmd,
2969                                    &isert_cmd->tx_desc.send_wr);
2970                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2971                 wr->send_wr_num += 1;
2972
2973                 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2974                 if (rc) {
2975                         isert_err("ib_post_recv failed with %d\n", rc);
2976                         return rc;
2977                 }
2978         }
2979
2980         rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2981         if (rc)
2982                 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2983
2984         if (!isert_prot_cmd(isert_conn, se_cmd))
2985                 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2986                          "READ\n", isert_cmd);
2987         else
2988                 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2989                          isert_cmd);
2990
2991         return 1;
2992 }
2993
2994 static int
2995 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2996 {
2997         struct se_cmd *se_cmd = &cmd->se_cmd;
2998         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2999         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
3000         struct isert_conn *isert_conn = conn->context;
3001         struct isert_device *device = isert_conn->device;
3002         struct ib_send_wr *wr_failed;
3003         int rc;
3004
3005         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
3006                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
3007         wr->iser_ib_op = ISER_IB_RDMA_READ;
3008         rc = device->reg_rdma_mem(conn, cmd, wr);
3009         if (rc) {
3010                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
3011                 return rc;
3012         }
3013
3014         rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
3015         if (rc)
3016                 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
3017
3018         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
3019                  isert_cmd);
3020
3021         return 0;
3022 }
3023
3024 static int
3025 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3026 {
3027         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3028         int ret = 0;
3029
3030         switch (state) {
3031         case ISTATE_REMOVE:
3032                 spin_lock_bh(&conn->cmd_lock);
3033                 list_del_init(&cmd->i_conn_node);
3034                 spin_unlock_bh(&conn->cmd_lock);
3035                 isert_put_cmd(isert_cmd, true);
3036                 break;
3037         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3038                 ret = isert_put_nopin(cmd, conn, false);
3039                 break;
3040         default:
3041                 isert_err("Unknown immediate state: 0x%02x\n", state);
3042                 ret = -EINVAL;
3043                 break;
3044         }
3045
3046         return ret;
3047 }
3048
3049 static int
3050 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3051 {
3052         struct isert_conn *isert_conn = conn->context;
3053         int ret;
3054
3055         switch (state) {
3056         case ISTATE_SEND_LOGOUTRSP:
3057                 ret = isert_put_logout_rsp(cmd, conn);
3058                 if (!ret)
3059                         isert_conn->logout_posted = true;
3060                 break;
3061         case ISTATE_SEND_NOPIN:
3062                 ret = isert_put_nopin(cmd, conn, true);
3063                 break;
3064         case ISTATE_SEND_TASKMGTRSP:
3065                 ret = isert_put_tm_rsp(cmd, conn);
3066                 break;
3067         case ISTATE_SEND_REJECT:
3068                 ret = isert_put_reject(cmd, conn);
3069                 break;
3070         case ISTATE_SEND_TEXTRSP:
3071                 ret = isert_put_text_rsp(cmd, conn);
3072                 break;
3073         case ISTATE_SEND_STATUS:
3074                 /*
3075                  * Special case for sending non GOOD SCSI status from TX thread
3076                  * context during pre se_cmd excecution failure.
3077                  */
3078                 ret = isert_put_response(conn, cmd);
3079                 break;
3080         default:
3081                 isert_err("Unknown response state: 0x%02x\n", state);
3082                 ret = -EINVAL;
3083                 break;
3084         }
3085
3086         return ret;
3087 }
3088
3089 struct rdma_cm_id *
3090 isert_setup_id(struct isert_np *isert_np)
3091 {
3092         struct iscsi_np *np = isert_np->np;
3093         struct rdma_cm_id *id;
3094         struct sockaddr *sa;
3095         int ret;
3096
3097         sa = (struct sockaddr *)&np->np_sockaddr;
3098         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3099
3100         id = rdma_create_id(isert_cma_handler, isert_np,
3101                             RDMA_PS_TCP, IB_QPT_RC);
3102         if (IS_ERR(id)) {
3103                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3104                 ret = PTR_ERR(id);
3105                 goto out;
3106         }
3107         isert_dbg("id %p context %p\n", id, id->context);
3108
3109         ret = rdma_bind_addr(id, sa);
3110         if (ret) {
3111                 isert_err("rdma_bind_addr() failed: %d\n", ret);
3112                 goto out_id;
3113         }
3114
3115         ret = rdma_listen(id, 0);
3116         if (ret) {
3117                 isert_err("rdma_listen() failed: %d\n", ret);
3118                 goto out_id;
3119         }
3120
3121         return id;
3122 out_id:
3123         rdma_destroy_id(id);
3124 out:
3125         return ERR_PTR(ret);
3126 }
3127
3128 static int
3129 isert_setup_np(struct iscsi_np *np,
3130                struct sockaddr_storage *ksockaddr)
3131 {
3132         struct isert_np *isert_np;
3133         struct rdma_cm_id *isert_lid;
3134         int ret;
3135
3136         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3137         if (!isert_np) {
3138                 isert_err("Unable to allocate struct isert_np\n");
3139                 return -ENOMEM;
3140         }
3141         sema_init(&isert_np->sem, 0);
3142         mutex_init(&isert_np->mutex);
3143         INIT_LIST_HEAD(&isert_np->accepted);
3144         INIT_LIST_HEAD(&isert_np->pending);
3145         isert_np->np = np;
3146
3147         /*
3148          * Setup the np->np_sockaddr from the passed sockaddr setup
3149          * in iscsi_target_configfs.c code..
3150          */
3151         memcpy(&np->np_sockaddr, ksockaddr,
3152                sizeof(struct sockaddr_storage));
3153
3154         isert_lid = isert_setup_id(isert_np);
3155         if (IS_ERR(isert_lid)) {
3156                 ret = PTR_ERR(isert_lid);
3157                 goto out;
3158         }
3159
3160         isert_np->cm_id = isert_lid;
3161         np->np_context = isert_np;
3162
3163         return 0;
3164
3165 out:
3166         kfree(isert_np);
3167
3168         return ret;
3169 }
3170
3171 static int
3172 isert_rdma_accept(struct isert_conn *isert_conn)
3173 {
3174         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3175         struct rdma_conn_param cp;
3176         int ret;
3177
3178         memset(&cp, 0, sizeof(struct rdma_conn_param));
3179         cp.initiator_depth = isert_conn->initiator_depth;
3180         cp.retry_count = 7;
3181         cp.rnr_retry_count = 7;
3182
3183         ret = rdma_accept(cm_id, &cp);
3184         if (ret) {
3185                 isert_err("rdma_accept() failed with: %d\n", ret);
3186                 return ret;
3187         }
3188
3189         return 0;
3190 }
3191
3192 static int
3193 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3194 {
3195         struct isert_conn *isert_conn = conn->context;
3196         int ret;
3197
3198         isert_info("before login_req comp conn: %p\n", isert_conn);
3199         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3200         if (ret) {
3201                 isert_err("isert_conn %p interrupted before got login req\n",
3202                           isert_conn);
3203                 return ret;
3204         }
3205         reinit_completion(&isert_conn->login_req_comp);
3206
3207         /*
3208          * For login requests after the first PDU, isert_rx_login_req() will
3209          * kick schedule_delayed_work(&conn->login_work) as the packet is
3210          * received, which turns this callback from iscsi_target_do_login_rx()
3211          * into a NOP.
3212          */
3213         if (!login->first_request)
3214                 return 0;
3215
3216         isert_rx_login_req(isert_conn);
3217
3218         isert_info("before login_comp conn: %p\n", conn);
3219         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3220         if (ret)
3221                 return ret;
3222
3223         isert_info("processing login->req: %p\n", login->req);
3224
3225         return 0;
3226 }
3227
3228 static void
3229 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3230                     struct isert_conn *isert_conn)
3231 {
3232         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3233         struct rdma_route *cm_route = &cm_id->route;
3234
3235         conn->login_family = np->np_sockaddr.ss_family;
3236
3237         conn->login_sockaddr = cm_route->addr.dst_addr;
3238         conn->local_sockaddr = cm_route->addr.src_addr;
3239 }
3240
3241 static int
3242 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3243 {
3244         struct isert_np *isert_np = np->np_context;
3245         struct isert_conn *isert_conn;
3246         int ret;
3247
3248 accept_wait:
3249         ret = down_interruptible(&isert_np->sem);
3250         if (ret)
3251                 return -ENODEV;
3252
3253         spin_lock_bh(&np->np_thread_lock);
3254         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3255                 spin_unlock_bh(&np->np_thread_lock);
3256                 isert_dbg("np_thread_state %d\n",
3257                          np->np_thread_state);
3258                 /**
3259                  * No point in stalling here when np_thread
3260                  * is in state RESET/SHUTDOWN/EXIT - bail
3261                  **/
3262                 return -ENODEV;
3263         }
3264         spin_unlock_bh(&np->np_thread_lock);
3265
3266         mutex_lock(&isert_np->mutex);
3267         if (list_empty(&isert_np->pending)) {
3268                 mutex_unlock(&isert_np->mutex);
3269                 goto accept_wait;
3270         }
3271         isert_conn = list_first_entry(&isert_np->pending,
3272                         struct isert_conn, node);
3273         list_del_init(&isert_conn->node);
3274         mutex_unlock(&isert_np->mutex);
3275
3276         conn->context = isert_conn;
3277         isert_conn->conn = conn;
3278
3279         isert_set_conn_info(np, conn, isert_conn);
3280
3281         isert_dbg("Processing isert_conn: %p\n", isert_conn);
3282
3283         return 0;
3284 }
3285
3286 static void
3287 isert_free_np(struct iscsi_np *np)
3288 {
3289         struct isert_np *isert_np = np->np_context;
3290         struct isert_conn *isert_conn, *n;
3291
3292         if (isert_np->cm_id)
3293                 rdma_destroy_id(isert_np->cm_id);
3294
3295         /*
3296          * FIXME: At this point we don't have a good way to insure
3297          * that at this point we don't have hanging connections that
3298          * completed RDMA establishment but didn't start iscsi login
3299          * process. So work-around this by cleaning up what ever piled
3300          * up in accepted and pending lists.
3301          */
3302         mutex_lock(&isert_np->mutex);
3303         if (!list_empty(&isert_np->pending)) {
3304                 isert_info("Still have isert pending connections\n");
3305                 list_for_each_entry_safe(isert_conn, n,
3306                                          &isert_np->pending,
3307                                          node) {
3308                         isert_info("cleaning isert_conn %p state (%d)\n",
3309                                    isert_conn, isert_conn->state);
3310                         isert_connect_release(isert_conn);
3311                 }
3312         }
3313
3314         if (!list_empty(&isert_np->accepted)) {
3315                 isert_info("Still have isert accepted connections\n");
3316                 list_for_each_entry_safe(isert_conn, n,
3317                                          &isert_np->accepted,
3318                                          node) {
3319                         isert_info("cleaning isert_conn %p state (%d)\n",
3320                                    isert_conn, isert_conn->state);
3321                         isert_connect_release(isert_conn);
3322                 }
3323         }
3324         mutex_unlock(&isert_np->mutex);
3325
3326         np->np_context = NULL;
3327         kfree(isert_np);
3328 }
3329
3330 static void isert_release_work(struct work_struct *work)
3331 {
3332         struct isert_conn *isert_conn = container_of(work,
3333                                                      struct isert_conn,
3334                                                      release_work);
3335
3336         isert_info("Starting release conn %p\n", isert_conn);
3337
3338         wait_for_completion(&isert_conn->wait);
3339
3340         mutex_lock(&isert_conn->mutex);
3341         isert_conn->state = ISER_CONN_DOWN;
3342         mutex_unlock(&isert_conn->mutex);
3343
3344         isert_info("Destroying conn %p\n", isert_conn);
3345         isert_put_conn(isert_conn);
3346 }
3347
3348 static void
3349 isert_wait4logout(struct isert_conn *isert_conn)
3350 {
3351         struct iscsi_conn *conn = isert_conn->conn;
3352
3353         isert_info("conn %p\n", isert_conn);
3354
3355         if (isert_conn->logout_posted) {
3356                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3357                 wait_for_completion_timeout(&conn->conn_logout_comp,
3358                                             SECONDS_FOR_LOGOUT_COMP * HZ);
3359         }
3360 }
3361
3362 static void
3363 isert_wait4cmds(struct iscsi_conn *conn)
3364 {
3365         isert_info("iscsi_conn %p\n", conn);
3366
3367         if (conn->sess) {
3368                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3369                 target_wait_for_sess_cmds(conn->sess->se_sess);
3370         }
3371 }
3372
3373 static void
3374 isert_wait4flush(struct isert_conn *isert_conn)
3375 {
3376         struct ib_recv_wr *bad_wr;
3377
3378         isert_info("conn %p\n", isert_conn);
3379
3380         init_completion(&isert_conn->wait_comp_err);
3381         isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3382         /* post an indication that all flush errors were consumed */
3383         if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3384                 isert_err("conn %p failed to post beacon", isert_conn);
3385                 return;
3386         }
3387
3388         wait_for_completion(&isert_conn->wait_comp_err);
3389 }
3390
3391 /**
3392  * isert_put_unsol_pending_cmds() - Drop commands waiting for
3393  *     unsolicitate dataout
3394  * @conn:    iscsi connection
3395  *
3396  * We might still have commands that are waiting for unsolicited
3397  * dataouts messages. We must put the extra reference on those
3398  * before blocking on the target_wait_for_session_cmds
3399  */
3400 static void
3401 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3402 {
3403         struct iscsi_cmd *cmd, *tmp;
3404         static LIST_HEAD(drop_cmd_list);
3405
3406         spin_lock_bh(&conn->cmd_lock);
3407         list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3408                 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3409                     (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3410                     (cmd->write_data_done < cmd->se_cmd.data_length))
3411                         list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3412         }
3413         spin_unlock_bh(&conn->cmd_lock);
3414
3415         list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3416                 list_del_init(&cmd->i_conn_node);
3417                 if (cmd->i_state != ISTATE_REMOVE) {
3418                         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3419
3420                         isert_info("conn %p dropping cmd %p\n", conn, cmd);
3421                         isert_put_cmd(isert_cmd, true);
3422                 }
3423         }
3424 }
3425
3426 static void isert_wait_conn(struct iscsi_conn *conn)
3427 {
3428         struct isert_conn *isert_conn = conn->context;
3429
3430         isert_info("Starting conn %p\n", isert_conn);
3431
3432         mutex_lock(&isert_conn->mutex);
3433         /*
3434          * Only wait for wait_comp_err if the isert_conn made it
3435          * into full feature phase..
3436          */
3437         if (isert_conn->state == ISER_CONN_INIT) {
3438                 mutex_unlock(&isert_conn->mutex);
3439                 return;
3440         }
3441         isert_conn_terminate(isert_conn);
3442         mutex_unlock(&isert_conn->mutex);
3443
3444         isert_wait4flush(isert_conn);
3445         isert_put_unsol_pending_cmds(conn);
3446         isert_wait4cmds(conn);
3447         isert_wait4logout(isert_conn);
3448
3449         queue_work(isert_release_wq, &isert_conn->release_work);
3450 }
3451
3452 static void isert_free_conn(struct iscsi_conn *conn)
3453 {
3454         struct isert_conn *isert_conn = conn->context;
3455
3456         isert_wait4flush(isert_conn);
3457         isert_put_conn(isert_conn);
3458 }
3459
3460 static struct iscsit_transport iser_target_transport = {
3461         .name                   = "IB/iSER",
3462         .transport_type         = ISCSI_INFINIBAND,
3463         .priv_size              = sizeof(struct isert_cmd),
3464         .owner                  = THIS_MODULE,
3465         .iscsit_setup_np        = isert_setup_np,
3466         .iscsit_accept_np       = isert_accept_np,
3467         .iscsit_free_np         = isert_free_np,
3468         .iscsit_wait_conn       = isert_wait_conn,
3469         .iscsit_free_conn       = isert_free_conn,
3470         .iscsit_get_login_rx    = isert_get_login_rx,
3471         .iscsit_put_login_tx    = isert_put_login_tx,
3472         .iscsit_immediate_queue = isert_immediate_queue,
3473         .iscsit_response_queue  = isert_response_queue,
3474         .iscsit_get_dataout     = isert_get_dataout,
3475         .iscsit_queue_data_in   = isert_put_datain,
3476         .iscsit_queue_status    = isert_put_response,
3477         .iscsit_aborted_task    = isert_aborted_task,
3478         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3479 };
3480
3481 static int __init isert_init(void)
3482 {
3483         int ret;
3484
3485         isert_comp_wq = alloc_workqueue("isert_comp_wq",
3486                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
3487         if (!isert_comp_wq) {
3488                 isert_err("Unable to allocate isert_comp_wq\n");
3489                 ret = -ENOMEM;
3490                 return -ENOMEM;
3491         }
3492
3493         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3494                                         WQ_UNBOUND_MAX_ACTIVE);
3495         if (!isert_release_wq) {
3496                 isert_err("Unable to allocate isert_release_wq\n");
3497                 ret = -ENOMEM;
3498                 goto destroy_comp_wq;
3499         }
3500
3501         iscsit_register_transport(&iser_target_transport);
3502         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3503
3504         return 0;
3505
3506 destroy_comp_wq:
3507         destroy_workqueue(isert_comp_wq);
3508
3509         return ret;
3510 }
3511
3512 static void __exit isert_exit(void)
3513 {
3514         flush_scheduled_work();
3515         destroy_workqueue(isert_release_wq);
3516         destroy_workqueue(isert_comp_wq);
3517         iscsit_unregister_transport(&iser_target_transport);
3518         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3519 }
3520
3521 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3522 MODULE_VERSION("1.0");
3523 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3524 MODULE_LICENSE("GPL");
3525
3526 module_init(isert_init);
3527 module_exit(isert_exit);