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->mr->lkey;
 239         }
 240
 241         isert_conn->rx_desc_head = 0;
 242
 243         return 0;
 244
 245 dma_map_fail:
 246         rx_desc = isert_conn->rx_descs;
 247         for (j = 0; j < i; j++, rx_desc++) {
 248                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 249                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 250         }
 251         kfree(isert_conn->rx_descs);
 252         isert_conn->rx_descs = NULL;
 253 fail:
 254         isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
 255
 256         return -ENOMEM;
 257 }
 258
 259 static void
 260 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 261 {
 262         struct ib_device *ib_dev = isert_conn->device->ib_device;
 263         struct iser_rx_desc *rx_desc;
 264         int i;
 265
 266         if (!isert_conn->rx_descs)
 267                 return;
 268
 269         rx_desc = isert_conn->rx_descs;
 270         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 271                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 272                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 273         }
 274
 275         kfree(isert_conn->rx_descs);
 276         isert_conn->rx_descs = NULL;
 277 }
 278
 279 static void isert_cq_work(struct work_struct *);
 280 static void isert_cq_callback(struct ib_cq *, void *);
 281
 282 static void
 283 isert_free_comps(struct isert_device *device)
 284 {
 285         int i;
 286
 287         for (i = 0; i < device->comps_used; i++) {
 288                 struct isert_comp *comp = &device->comps[i];
 289
 290                 if (comp->cq) {
 291                         cancel_work_sync(&comp->work);
 292                         ib_destroy_cq(comp->cq);
 293                 }
 294         }
 295         kfree(device->comps);
 296 }
 297
 298 static int
 299 isert_alloc_comps(struct isert_device *device,
 300                   struct ib_device_attr *attr)
 301 {
 302         int i, max_cqe, ret = 0;
 303
 304         device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
 305                                  device->ib_device->num_comp_vectors));
 306
 307         isert_info("Using %d CQs, %s supports %d vectors support "
 308                    "Fast registration %d pi_capable %d\n",
 309                    device->comps_used, device->ib_device->name,
 310                    device->ib_device->num_comp_vectors, device->use_fastreg,
 311                    device->pi_capable);
 312
 313         device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
 314                                 GFP_KERNEL);
 315         if (!device->comps) {
 316                 isert_err("Unable to allocate completion contexts\n");
 317                 return -ENOMEM;
 318         }
 319
 320         max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
 321
 322         for (i = 0; i < device->comps_used; i++) {
 323                 struct ib_cq_init_attr cq_attr = {};
 324                 struct isert_comp *comp = &device->comps[i];
 325
 326                 comp->device = device;
 327                 INIT_WORK(&comp->work, isert_cq_work);
 328                 cq_attr.cqe = max_cqe;
 329                 cq_attr.comp_vector = i;
 330                 comp->cq = ib_create_cq(device->ib_device,
 331                                         isert_cq_callback,
 332                                         isert_cq_event_callback,
 333                                         (void *)comp,
 334                                         &cq_attr);
 335                 if (IS_ERR(comp->cq)) {
 336                         isert_err("Unable to allocate cq\n");
 337                         ret = PTR_ERR(comp->cq);
 338                         comp->cq = NULL;
 339                         goto out_cq;
 340                 }
 341
 342                 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
 343                 if (ret)
 344                         goto out_cq;
 345         }
 346
 347         return 0;
 348 out_cq:
 349         isert_free_comps(device);
 350         return ret;
 351 }
 352
 353 static int
 354 isert_create_device_ib_res(struct isert_device *device)
 355 {
 356         struct ib_device_attr *dev_attr;
 357         int ret;
 358
 359         dev_attr = &device->dev_attr;
 360         ret = isert_query_device(device->ib_device, dev_attr);
 361         if (ret)
 362                 return ret;
 363
 364         /* asign function handlers */
 365         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 366             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 367                 device->use_fastreg = 1;
 368                 device->reg_rdma_mem = isert_reg_rdma;
 369                 device->unreg_rdma_mem = isert_unreg_rdma;
 370         } else {
 371                 device->use_fastreg = 0;
 372                 device->reg_rdma_mem = isert_map_rdma;
 373                 device->unreg_rdma_mem = isert_unmap_cmd;
 374         }
 375
 376         ret = isert_alloc_comps(device, dev_attr);
 377         if (ret)
 378                 return ret;
 379
 380         device->pd = ib_alloc_pd(device->ib_device);
 381         if (IS_ERR(device->pd)) {
 382                 ret = PTR_ERR(device->pd);
 383                 isert_err("failed to allocate pd, device %p, ret=%d\n",
 384                           device, ret);
 385                 goto out_cq;
 386         }
 387
 388         device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE);
 389         if (IS_ERR(device->mr)) {
 390                 ret = PTR_ERR(device->mr);
 391                 isert_err("failed to create dma mr, device %p, ret=%d\n",
 392                           device, ret);
 393                 goto out_mr;
 394         }
 395
 396         /* Check signature cap */
 397         device->pi_capable = dev_attr->device_cap_flags &
 398                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 399
 400         return 0;
 401
 402 out_mr:
 403         ib_dealloc_pd(device->pd);
 404 out_cq:
 405         isert_free_comps(device);
 406         return ret;
 407 }
 408
 409 static void
 410 isert_free_device_ib_res(struct isert_device *device)
 411 {
 412         isert_info("device %p\n", device);
 413
 414         ib_dereg_mr(device->mr);
 415         ib_dealloc_pd(device->pd);
 416         isert_free_comps(device);
 417 }
 418
 419 static void
 420 isert_device_put(struct isert_device *device)
 421 {
 422         mutex_lock(&device_list_mutex);
 423         device->refcount--;
 424         isert_info("device %p refcount %d\n", device, device->refcount);
 425         if (!device->refcount) {
 426                 isert_free_device_ib_res(device);
 427                 list_del(&device->dev_node);
 428                 kfree(device);
 429         }
 430         mutex_unlock(&device_list_mutex);
 431 }
 432
 433 static struct isert_device *
 434 isert_device_get(struct rdma_cm_id *cma_id)
 435 {
 436         struct isert_device *device;
 437         int ret;
 438
 439         mutex_lock(&device_list_mutex);
 440         list_for_each_entry(device, &device_list, dev_node) {
 441                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 442                         device->refcount++;
 443                         isert_info("Found iser device %p refcount %d\n",
 444                                    device, device->refcount);
 445                         mutex_unlock(&device_list_mutex);
 446                         return device;
 447                 }
 448         }
 449
 450         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 451         if (!device) {
 452                 mutex_unlock(&device_list_mutex);
 453                 return ERR_PTR(-ENOMEM);
 454         }
 455
 456         INIT_LIST_HEAD(&device->dev_node);
 457
 458         device->ib_device = cma_id->device;
 459         ret = isert_create_device_ib_res(device);
 460         if (ret) {
 461                 kfree(device);
 462                 mutex_unlock(&device_list_mutex);
 463                 return ERR_PTR(ret);
 464         }
 465
 466         device->refcount++;
 467         list_add_tail(&device->dev_node, &device_list);
 468         isert_info("Created a new iser device %p refcount %d\n",
 469                    device, device->refcount);
 470         mutex_unlock(&device_list_mutex);
 471
 472         return device;
 473 }
 474
 475 static void
 476 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 477 {
 478         struct fast_reg_descriptor *fr_desc, *tmp;
 479         int i = 0;
 480
 481         if (list_empty(&isert_conn->fr_pool))
 482                 return;
 483
 484         isert_info("Freeing conn %p fastreg pool", isert_conn);
 485
 486         list_for_each_entry_safe(fr_desc, tmp,
 487                                  &isert_conn->fr_pool, list) {
 488                 list_del(&fr_desc->list);
 489                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 490                 ib_dereg_mr(fr_desc->data_mr);
 491                 if (fr_desc->pi_ctx) {
 492                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 493                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 494                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 495                         kfree(fr_desc->pi_ctx);
 496                 }
 497                 kfree(fr_desc);
 498                 ++i;
 499         }
 500
 501         if (i < isert_conn->fr_pool_size)
 502                 isert_warn("Pool still has %d regions registered\n",
 503                         isert_conn->fr_pool_size - i);
 504 }
 505
 506 static int
 507 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
 508                     struct ib_device *device,
 509                     struct ib_pd *pd)
 510 {
 511         struct ib_mr_init_attr mr_init_attr;
 512         struct pi_context *pi_ctx;
 513         int ret;
 514
 515         pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
 516         if (!pi_ctx) {
 517                 isert_err("Failed to allocate pi context\n");
 518                 return -ENOMEM;
 519         }
 520
 521         pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
 522                                             ISCSI_ISER_SG_TABLESIZE);
 523         if (IS_ERR(pi_ctx->prot_frpl)) {
 524                 isert_err("Failed to allocate prot frpl err=%ld\n",
 525                           PTR_ERR(pi_ctx->prot_frpl));
 526                 ret = PTR_ERR(pi_ctx->prot_frpl);
 527                 goto err_pi_ctx;
 528         }
 529
 530         pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 531         if (IS_ERR(pi_ctx->prot_mr)) {
 532                 isert_err("Failed to allocate prot frmr err=%ld\n",
 533                           PTR_ERR(pi_ctx->prot_mr));
 534                 ret = PTR_ERR(pi_ctx->prot_mr);
 535                 goto err_prot_frpl;
 536         }
 537         desc->ind |= ISERT_PROT_KEY_VALID;
 538
 539         memset(&mr_init_attr, 0, sizeof(mr_init_attr));
 540         mr_init_attr.max_reg_descriptors = 2;
 541         mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 542         pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 543         if (IS_ERR(pi_ctx->sig_mr)) {
 544                 isert_err("Failed to allocate signature enabled mr err=%ld\n",
 545                           PTR_ERR(pi_ctx->sig_mr));
 546                 ret = PTR_ERR(pi_ctx->sig_mr);
 547                 goto err_prot_mr;
 548         }
 549
 550         desc->pi_ctx = pi_ctx;
 551         desc->ind |= ISERT_SIG_KEY_VALID;
 552         desc->ind &= ~ISERT_PROTECTED;
 553
 554         return 0;
 555
 556 err_prot_mr:
 557         ib_dereg_mr(pi_ctx->prot_mr);
 558 err_prot_frpl:
 559         ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
 560 err_pi_ctx:
 561         kfree(pi_ctx);
 562
 563         return ret;
 564 }
 565
 566 static int
 567 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 568                      struct fast_reg_descriptor *fr_desc)
 569 {
 570         int ret;
 571
 572         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 573                                                          ISCSI_ISER_SG_TABLESIZE);
 574         if (IS_ERR(fr_desc->data_frpl)) {
 575                 isert_err("Failed to allocate data frpl err=%ld\n",
 576                           PTR_ERR(fr_desc->data_frpl));
 577                 return PTR_ERR(fr_desc->data_frpl);
 578         }
 579
 580         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 581         if (IS_ERR(fr_desc->data_mr)) {
 582                 isert_err("Failed to allocate data frmr err=%ld\n",
 583                           PTR_ERR(fr_desc->data_mr));
 584                 ret = PTR_ERR(fr_desc->data_mr);
 585                 goto err_data_frpl;
 586         }
 587         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 588
 589         isert_dbg("Created fr_desc %p\n", fr_desc);
 590
 591         return 0;
 592
 593 err_data_frpl:
 594         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 595
 596         return ret;
 597 }
 598
 599 static int
 600 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
 601 {
 602         struct fast_reg_descriptor *fr_desc;
 603         struct isert_device *device = isert_conn->device;
 604         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 605         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 606         int i, ret, tag_num;
 607         /*
 608          * Setup the number of FRMRs based upon the number of tags
 609          * available to session in iscsi_target_locate_portal().
 610          */
 611         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 612         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 613
 614         isert_conn->fr_pool_size = 0;
 615         for (i = 0; i < tag_num; i++) {
 616                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 617                 if (!fr_desc) {
 618                         isert_err("Failed to allocate fast_reg descriptor\n");
 619                         ret = -ENOMEM;
 620                         goto err;
 621                 }
 622
 623                 ret = isert_create_fr_desc(device->ib_device,
 624                                            device->pd, fr_desc);
 625                 if (ret) {
 626                         isert_err("Failed to create fastreg descriptor err=%d\n",
 627                                ret);
 628                         kfree(fr_desc);
 629                         goto err;
 630                 }
 631
 632                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
 633                 isert_conn->fr_pool_size++;
 634         }
 635
 636         isert_dbg("Creating conn %p fastreg pool size=%d",
 637                  isert_conn, isert_conn->fr_pool_size);
 638
 639         return 0;
 640
 641 err:
 642         isert_conn_free_fastreg_pool(isert_conn);
 643         return ret;
 644 }
 645
 646 static void
 647 isert_init_conn(struct isert_conn *isert_conn)
 648 {
 649         isert_conn->state = ISER_CONN_INIT;
 650         INIT_LIST_HEAD(&isert_conn->accept_node);
 651         init_completion(&isert_conn->login_comp);
 652         init_completion(&isert_conn->login_req_comp);
 653         init_completion(&isert_conn->wait);
 654         kref_init(&isert_conn->kref);
 655         mutex_init(&isert_conn->mutex);
 656         spin_lock_init(&isert_conn->pool_lock);
 657         INIT_LIST_HEAD(&isert_conn->fr_pool);
 658         INIT_WORK(&isert_conn->release_work, isert_release_work);
 659 }
 660
 661 static void
 662 isert_free_login_buf(struct isert_conn *isert_conn)
 663 {
 664         struct ib_device *ib_dev = isert_conn->device->ib_device;
 665
 666         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 667                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 668         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 669                             ISCSI_DEF_MAX_RECV_SEG_LEN,
 670                             DMA_FROM_DEVICE);
 671         kfree(isert_conn->login_buf);
 672 }
 673
 674 static int
 675 isert_alloc_login_buf(struct isert_conn *isert_conn,
 676                       struct ib_device *ib_dev)
 677 {
 678         int ret;
 679
 680         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 681                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 682         if (!isert_conn->login_buf) {
 683                 isert_err("Unable to allocate isert_conn->login_buf\n");
 684                 return -ENOMEM;
 685         }
 686
 687         isert_conn->login_req_buf = isert_conn->login_buf;
 688         isert_conn->login_rsp_buf = isert_conn->login_buf +
 689                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 690
 691         isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 692                  isert_conn->login_buf, isert_conn->login_req_buf,
 693                  isert_conn->login_rsp_buf);
 694
 695         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 696                                 (void *)isert_conn->login_req_buf,
 697                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 698
 699         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 700         if (ret) {
 701                 isert_err("login_req_dma mapping error: %d\n", ret);
 702                 isert_conn->login_req_dma = 0;
 703                 goto out_login_buf;
 704         }
 705
 706         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 707                                         (void *)isert_conn->login_rsp_buf,
 708                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 709
 710         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 711         if (ret) {
 712                 isert_err("login_rsp_dma mapping error: %d\n", ret);
 713                 isert_conn->login_rsp_dma = 0;
 714                 goto out_req_dma_map;
 715         }
 716
 717         return 0;
 718
 719 out_req_dma_map:
 720         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 721                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 722 out_login_buf:
 723         kfree(isert_conn->login_buf);
 724         return ret;
 725 }
 726
 727 static int
 728 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 729 {
 730         struct isert_np *isert_np = cma_id->context;
 731         struct iscsi_np *np = isert_np->np;
 732         struct isert_conn *isert_conn;
 733         struct isert_device *device;
 734         int ret = 0;
 735
 736         spin_lock_bh(&np->np_thread_lock);
 737         if (!np->enabled) {
 738                 spin_unlock_bh(&np->np_thread_lock);
 739                 isert_dbg("iscsi_np is not enabled, reject connect request\n");
 740                 return rdma_reject(cma_id, NULL, 0);
 741         }
 742         spin_unlock_bh(&np->np_thread_lock);
 743
 744         isert_dbg("cma_id: %p, portal: %p\n",
 745                  cma_id, cma_id->context);
 746
 747         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 748         if (!isert_conn)
 749                 return -ENOMEM;
 750
 751         isert_init_conn(isert_conn);
 752         isert_conn->cm_id = cma_id;
 753
 754         ret = isert_alloc_login_buf(isert_conn, cma_id->device);
 755         if (ret)
 756                 goto out;
 757
 758         device = isert_device_get(cma_id);
 759         if (IS_ERR(device)) {
 760                 ret = PTR_ERR(device);
 761                 goto out_rsp_dma_map;
 762         }
 763         isert_conn->device = device;
 764
 765         /* Set max inflight RDMA READ requests */
 766         isert_conn->initiator_depth = min_t(u8,
 767                                 event->param.conn.initiator_depth,
 768                                 device->dev_attr.max_qp_init_rd_atom);
 769         isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 770
 771         ret = isert_conn_setup_qp(isert_conn, cma_id);
 772         if (ret)
 773                 goto out_conn_dev;
 774
 775         ret = isert_rdma_post_recvl(isert_conn);
 776         if (ret)
 777                 goto out_conn_dev;
 778         /*
 779          * Obtain the second reference now before isert_rdma_accept() to
 780          * ensure that any initiator generated REJECT CM event that occurs
 781          * asynchronously won't drop the last reference until the error path
 782          * in iscsi_target_login_sess_out() does it's ->iscsit_free_conn() ->
 783          * isert_free_conn() -> isert_put_conn() -> kref_put().
 784          */
 785         if (!kref_get_unless_zero(&isert_conn->kref)) {
 786                 isert_warn("conn %p connect_release is running\n", isert_conn);
 787                 goto out_conn_dev;
 788         }
 789
 790         ret = isert_rdma_accept(isert_conn);
 791         if (ret)
 792                 goto out_conn_dev;
 793
 794         mutex_lock(&isert_np->np_accept_mutex);
 795         list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list);
 796         mutex_unlock(&isert_np->np_accept_mutex);
 797
 798         isert_info("np %p: Allow accept_np to continue\n", np);
 799         up(&isert_np->np_sem);
 800         return 0;
 801
 802 out_conn_dev:
 803         isert_device_put(device);
 804 out_rsp_dma_map:
 805         isert_free_login_buf(isert_conn);
 806 out:
 807         kfree(isert_conn);
 808         rdma_reject(cma_id, NULL, 0);
 809         return ret;
 810 }
 811
 812 static void
 813 isert_connect_release(struct isert_conn *isert_conn)
 814 {
 815         struct isert_device *device = isert_conn->device;
 816
 817         isert_dbg("conn %p\n", isert_conn);
 818
 819         BUG_ON(!device);
 820
 821         if (device->use_fastreg)
 822                 isert_conn_free_fastreg_pool(isert_conn);
 823
 824         isert_free_rx_descriptors(isert_conn);
 825         if (isert_conn->cm_id)
 826                 rdma_destroy_id(isert_conn->cm_id);
 827
 828         if (isert_conn->qp) {
 829                 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
 830
 831                 isert_comp_put(comp);
 832                 ib_destroy_qp(isert_conn->qp);
 833         }
 834
 835         if (isert_conn->login_buf)
 836                 isert_free_login_buf(isert_conn);
 837
 838         isert_device_put(device);
 839
 840         kfree(isert_conn);
 841 }
 842
 843 static void
 844 isert_connected_handler(struct rdma_cm_id *cma_id)
 845 {
 846         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 847
 848         isert_info("conn %p\n", isert_conn);
 849
 850         mutex_lock(&isert_conn->mutex);
 851         if (isert_conn->state != ISER_CONN_FULL_FEATURE)
 852                 isert_conn->state = ISER_CONN_UP;
 853         mutex_unlock(&isert_conn->mutex);
 854 }
 855
 856 static void
 857 isert_release_kref(struct kref *kref)
 858 {
 859         struct isert_conn *isert_conn = container_of(kref,
 860                                 struct isert_conn, kref);
 861
 862         isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
 863                    current->pid);
 864
 865         isert_connect_release(isert_conn);
 866 }
 867
 868 static void
 869 isert_put_conn(struct isert_conn *isert_conn)
 870 {
 871         kref_put(&isert_conn->kref, isert_release_kref);
 872 }
 873
 874 /**
 875  * isert_conn_terminate() - Initiate connection termination
 876  * @isert_conn: isert connection struct
 877  *
 878  * Notes:
 879  * In case the connection state is FULL_FEATURE, move state
 880  * to TEMINATING and start teardown sequence (rdma_disconnect).
 881  * In case the connection state is UP, complete flush as well.
 882  *
 883  * This routine must be called with mutex held. Thus it is
 884  * safe to call multiple times.
 885  */
 886 static void
 887 isert_conn_terminate(struct isert_conn *isert_conn)
 888 {
 889         int err;
 890
 891         switch (isert_conn->state) {
 892         case ISER_CONN_TERMINATING:
 893                 break;
 894         case ISER_CONN_UP:
 895         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 896                 isert_info("Terminating conn %p state %d\n",
 897                            isert_conn, isert_conn->state);
 898                 isert_conn->state = ISER_CONN_TERMINATING;
 899                 err = rdma_disconnect(isert_conn->cm_id);
 900                 if (err)
 901                         isert_warn("Failed rdma_disconnect isert_conn %p\n",
 902                                    isert_conn);
 903                 break;
 904         default:
 905                 isert_warn("conn %p teminating in state %d\n",
 906                            isert_conn, isert_conn->state);
 907         }
 908 }
 909
 910 static int
 911 isert_np_cma_handler(struct isert_np *isert_np,
 912                      enum rdma_cm_event_type event)
 913 {
 914         isert_dbg("%s (%d): isert np %p\n",
 915                   rdma_event_msg(event), event, isert_np);
 916
 917         switch (event) {
 918         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 919                 isert_np->np_cm_id = NULL;
 920                 break;
 921         case RDMA_CM_EVENT_ADDR_CHANGE:
 922                 isert_np->np_cm_id = isert_setup_id(isert_np);
 923                 if (IS_ERR(isert_np->np_cm_id)) {
 924                         isert_err("isert np %p setup id failed: %ld\n",
 925                                   isert_np, PTR_ERR(isert_np->np_cm_id));
 926                         isert_np->np_cm_id = NULL;
 927                 }
 928                 break;
 929         default:
 930                 isert_err("isert np %p Unexpected event %d\n",
 931                           isert_np, event);
 932         }
 933
 934         return -1;
 935 }
 936
 937 static int
 938 isert_disconnected_handler(struct rdma_cm_id *cma_id,
 939                            enum rdma_cm_event_type event)
 940 {
 941         struct isert_np *isert_np = cma_id->context;
 942         struct isert_conn *isert_conn;
 943         bool terminating = false;
 944
 945         if (isert_np->np_cm_id == cma_id)
 946                 return isert_np_cma_handler(cma_id->context, event);
 947
 948         isert_conn = cma_id->qp->qp_context;
 949
 950         mutex_lock(&isert_conn->mutex);
 951         terminating = (isert_conn->state == ISER_CONN_TERMINATING);
 952         isert_conn_terminate(isert_conn);
 953         mutex_unlock(&isert_conn->mutex);
 954
 955         isert_info("conn %p completing wait\n", isert_conn);
 956         complete(&isert_conn->wait);
 957
 958         if (terminating)
 959                 goto out;
 960
 961         mutex_lock(&isert_np->np_accept_mutex);
 962         if (!list_empty(&isert_conn->accept_node)) {
 963                 list_del_init(&isert_conn->accept_node);
 964                 isert_put_conn(isert_conn);
 965                 queue_work(isert_release_wq, &isert_conn->release_work);
 966         }
 967         mutex_unlock(&isert_np->np_accept_mutex);
 968
 969 out:
 970         return 0;
 971 }
 972
 973 static int
 974 isert_connect_error(struct rdma_cm_id *cma_id)
 975 {
 976         struct isert_conn *isert_conn = cma_id->qp->qp_context;
 977
 978         isert_conn->cm_id = NULL;
 979         isert_put_conn(isert_conn);
 980
 981         return -1;
 982 }
 983
 984 static int
 985 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 986 {
 987         int ret = 0;
 988
 989         isert_info("%s (%d): status %d id %p np %p\n",
 990                    rdma_event_msg(event->event), event->event,
 991                    event->status, cma_id, cma_id->context);
 992
 993         switch (event->event) {
 994         case RDMA_CM_EVENT_CONNECT_REQUEST:
 995                 ret = isert_connect_request(cma_id, event);
 996                 if (ret)
 997                         isert_err("failed handle connect request %d\n", ret);
 998                 break;
 999         case RDMA_CM_EVENT_ESTABLISHED:
1000                 isert_connected_handler(cma_id);
1001                 break;
1002         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
1003         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
1004         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
1005         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
1006                 ret = isert_disconnected_handler(cma_id, event->event);
1007                 break;
1008         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
1009         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
1010         case RDMA_CM_EVENT_CONNECT_ERROR:
1011                 ret = isert_connect_error(cma_id);
1012                 break;
1013         default:
1014                 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
1015                 break;
1016         }
1017
1018         return ret;
1019 }
1020
1021 static int
1022 isert_post_recv(struct isert_conn *isert_conn, u32 count)
1023 {
1024         struct ib_recv_wr *rx_wr, *rx_wr_failed;
1025         int i, ret;
1026         unsigned int rx_head = isert_conn->rx_desc_head;
1027         struct iser_rx_desc *rx_desc;
1028
1029         for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1030                 rx_desc         = &isert_conn->rx_descs[rx_head];
1031                 rx_wr->wr_id    = (uintptr_t)rx_desc;
1032                 rx_wr->sg_list  = &rx_desc->rx_sg;
1033                 rx_wr->num_sge  = 1;
1034                 rx_wr->next     = rx_wr + 1;
1035                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
1036         }
1037
1038         rx_wr--;
1039         rx_wr->next = NULL; /* mark end of work requests list */
1040
1041         isert_conn->post_recv_buf_count += count;
1042         ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
1043                                 &rx_wr_failed);
1044         if (ret) {
1045                 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1046                 isert_conn->post_recv_buf_count -= count;
1047         } else {
1048                 isert_dbg("Posted %d RX buffers\n", count);
1049                 isert_conn->rx_desc_head = rx_head;
1050         }
1051         return ret;
1052 }
1053
1054 static int
1055 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1056 {
1057         struct ib_device *ib_dev = isert_conn->cm_id->device;
1058         struct ib_send_wr send_wr, *send_wr_failed;
1059         int ret;
1060
1061         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1062                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
1063
1064         send_wr.next    = NULL;
1065         send_wr.wr_id   = (uintptr_t)tx_desc;
1066         send_wr.sg_list = tx_desc->tx_sg;
1067         send_wr.num_sge = tx_desc->num_sge;
1068         send_wr.opcode  = IB_WR_SEND;
1069         send_wr.send_flags = IB_SEND_SIGNALED;
1070
1071         ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1072         if (ret)
1073                 isert_err("ib_post_send() failed, ret: %d\n", ret);
1074
1075         return ret;
1076 }
1077
1078 static void
1079 isert_create_send_desc(struct isert_conn *isert_conn,
1080                        struct isert_cmd *isert_cmd,
1081                        struct iser_tx_desc *tx_desc)
1082 {
1083         struct isert_device *device = isert_conn->device;
1084         struct ib_device *ib_dev = device->ib_device;
1085
1086         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1087                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
1088
1089         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1090         tx_desc->iser_header.flags = ISER_VER;
1091
1092         tx_desc->num_sge = 1;
1093         tx_desc->isert_cmd = isert_cmd;
1094
1095         if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
1096                 tx_desc->tx_sg[0].lkey = device->mr->lkey;
1097                 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1098         }
1099 }
1100
1101 static int
1102 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1103                    struct iser_tx_desc *tx_desc)
1104 {
1105         struct isert_device *device = isert_conn->device;
1106         struct ib_device *ib_dev = device->ib_device;
1107         u64 dma_addr;
1108
1109         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1110                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
1111         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1112                 isert_err("ib_dma_mapping_error() failed\n");
1113                 return -ENOMEM;
1114         }
1115
1116         tx_desc->dma_addr = dma_addr;
1117         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
1118         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1119         tx_desc->tx_sg[0].lkey = device->mr->lkey;
1120
1121         isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1122                   tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1123                   tx_desc->tx_sg[0].lkey);
1124
1125         return 0;
1126 }
1127
1128 static void
1129 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1130                    struct ib_send_wr *send_wr)
1131 {
1132         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1133
1134         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1135         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1136         send_wr->opcode = IB_WR_SEND;
1137         send_wr->sg_list = &tx_desc->tx_sg[0];
1138         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1139         send_wr->send_flags = IB_SEND_SIGNALED;
1140 }
1141
1142 static int
1143 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1144 {
1145         struct ib_recv_wr rx_wr, *rx_wr_fail;
1146         struct ib_sge sge;
1147         int ret;
1148
1149         memset(&sge, 0, sizeof(struct ib_sge));
1150         sge.addr = isert_conn->login_req_dma;
1151         sge.length = ISER_RX_LOGIN_SIZE;
1152         sge.lkey = isert_conn->device->mr->lkey;
1153
1154         isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1155                 sge.addr, sge.length, sge.lkey);
1156
1157         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1158         rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1159         rx_wr.sg_list = &sge;
1160         rx_wr.num_sge = 1;
1161
1162         isert_conn->post_recv_buf_count++;
1163         ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1164         if (ret) {
1165                 isert_err("ib_post_recv() failed: %d\n", ret);
1166                 isert_conn->post_recv_buf_count--;
1167         }
1168
1169         return ret;
1170 }
1171
1172 static int
1173 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1174                    u32 length)
1175 {
1176         struct isert_conn *isert_conn = conn->context;
1177         struct isert_device *device = isert_conn->device;
1178         struct ib_device *ib_dev = device->ib_device;
1179         struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1180         int ret;
1181
1182         isert_create_send_desc(isert_conn, NULL, tx_desc);
1183
1184         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1185                sizeof(struct iscsi_hdr));
1186
1187         isert_init_tx_hdrs(isert_conn, tx_desc);
1188
1189         if (length > 0) {
1190                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1191
1192                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1193                                            length, DMA_TO_DEVICE);
1194
1195                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1196
1197                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1198                                               length, DMA_TO_DEVICE);
1199
1200                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1201                 tx_dsg->length  = length;
1202                 tx_dsg->lkey    = isert_conn->device->mr->lkey;
1203                 tx_desc->num_sge = 2;
1204         }
1205         if (!login->login_failed) {
1206                 if (login->login_complete) {
1207                         if (!conn->sess->sess_ops->SessionType &&
1208                             isert_conn->device->use_fastreg) {
1209                                 ret = isert_conn_create_fastreg_pool(isert_conn);
1210                                 if (ret) {
1211                                         isert_err("Conn: %p failed to create"
1212                                                " fastreg pool\n", isert_conn);
1213                                         return ret;
1214                                 }
1215                         }
1216
1217                         ret = isert_alloc_rx_descriptors(isert_conn);
1218                         if (ret)
1219                                 return ret;
1220
1221                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1222                         if (ret)
1223                                 return ret;
1224
1225                         /* Now we are in FULL_FEATURE phase */
1226                         mutex_lock(&isert_conn->mutex);
1227                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1228                         mutex_unlock(&isert_conn->mutex);
1229                         goto post_send;
1230                 }
1231
1232                 ret = isert_rdma_post_recvl(isert_conn);
1233                 if (ret)
1234                         return ret;
1235         }
1236 post_send:
1237         ret = isert_post_send(isert_conn, tx_desc);
1238         if (ret)
1239                 return ret;
1240
1241         return 0;
1242 }
1243
1244 static void
1245 isert_rx_login_req(struct isert_conn *isert_conn)
1246 {
1247         struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1248         int rx_buflen = isert_conn->login_req_len;
1249         struct iscsi_conn *conn = isert_conn->conn;
1250         struct iscsi_login *login = conn->conn_login;
1251         int size;
1252
1253         isert_info("conn %p\n", isert_conn);
1254
1255         WARN_ON_ONCE(!login);
1256
1257         if (login->first_request) {
1258                 struct iscsi_login_req *login_req =
1259                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1260                 /*
1261                  * Setup the initial iscsi_login values from the leading
1262                  * login request PDU.
1263                  */
1264                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1265                 login->current_stage =
1266                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1267                          >> 2;
1268                 login->version_min      = login_req->min_version;
1269                 login->version_max      = login_req->max_version;
1270                 memcpy(login->isid, login_req->isid, 6);
1271                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1272                 login->init_task_tag    = login_req->itt;
1273                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1274                 login->cid              = be16_to_cpu(login_req->cid);
1275                 login->tsih             = be16_to_cpu(login_req->tsih);
1276         }
1277
1278         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1279
1280         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1281         isert_dbg("Using login payload size: %d, rx_buflen: %d "
1282                   "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1283                   MAX_KEY_VALUE_PAIRS);
1284         memcpy(login->req_buf, &rx_desc->data[0], size);
1285
1286         if (login->first_request) {
1287                 complete(&isert_conn->login_comp);
1288                 return;
1289         }
1290         schedule_delayed_work(&conn->login_work, 0);
1291 }
1292
1293 static struct iscsi_cmd
1294 *isert_allocate_cmd(struct iscsi_conn *conn)
1295 {
1296         struct isert_conn *isert_conn = conn->context;
1297         struct isert_cmd *isert_cmd;
1298         struct iscsi_cmd *cmd;
1299
1300         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1301         if (!cmd) {
1302                 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1303                 return NULL;
1304         }
1305         isert_cmd = iscsit_priv_cmd(cmd);
1306         isert_cmd->conn = isert_conn;
1307         isert_cmd->iscsi_cmd = cmd;
1308
1309         return cmd;
1310 }
1311
1312 static int
1313 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1314                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1315                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1316 {
1317         struct iscsi_conn *conn = isert_conn->conn;
1318         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1319         struct scatterlist *sg;
1320         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1321         bool dump_payload = false;
1322
1323         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1324         if (rc < 0)
1325                 return rc;
1326
1327         imm_data = cmd->immediate_data;
1328         imm_data_len = cmd->first_burst_len;
1329         unsol_data = cmd->unsolicited_data;
1330
1331         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1332         if (rc < 0) {
1333                 return 0;
1334         } else if (rc > 0) {
1335                 dump_payload = true;
1336                 goto sequence_cmd;
1337         }
1338
1339         if (!imm_data)
1340                 return 0;
1341
1342         sg = &cmd->se_cmd.t_data_sg[0];
1343         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1344
1345         isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1346                   sg, sg_nents, &rx_desc->data[0], imm_data_len);
1347
1348         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1349
1350         cmd->write_data_done += imm_data_len;
1351
1352         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1353                 spin_lock_bh(&cmd->istate_lock);
1354                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1355                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1356                 spin_unlock_bh(&cmd->istate_lock);
1357         }
1358
1359 sequence_cmd:
1360         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1361
1362         if (!rc && dump_payload == false && unsol_data)
1363                 iscsit_set_unsoliticed_dataout(cmd);
1364         else if (dump_payload && imm_data)
1365                 target_put_sess_cmd(&cmd->se_cmd);
1366
1367         return 0;
1368 }
1369
1370 static int
1371 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1372                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1373 {
1374         struct scatterlist *sg_start;
1375         struct iscsi_conn *conn = isert_conn->conn;
1376         struct iscsi_cmd *cmd = NULL;
1377         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1378         u32 unsol_data_len = ntoh24(hdr->dlength);
1379         int rc, sg_nents, sg_off, page_off;
1380
1381         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1382         if (rc < 0)
1383                 return rc;
1384         else if (!cmd)
1385                 return 0;
1386         /*
1387          * FIXME: Unexpected unsolicited_data out
1388          */
1389         if (!cmd->unsolicited_data) {
1390                 isert_err("Received unexpected solicited data payload\n");
1391                 dump_stack();
1392                 return -1;
1393         }
1394
1395         isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1396                   "write_data_done: %u, data_length: %u\n",
1397                   unsol_data_len,  cmd->write_data_done,
1398                   cmd->se_cmd.data_length);
1399
1400         sg_off = cmd->write_data_done / PAGE_SIZE;
1401         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1402         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1403         page_off = cmd->write_data_done % PAGE_SIZE;
1404         /*
1405          * FIXME: Non page-aligned unsolicited_data out
1406          */
1407         if (page_off) {
1408                 isert_err("unexpected non-page aligned data payload\n");
1409                 dump_stack();
1410                 return -1;
1411         }
1412         isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1413                   "sg_nents: %u from %p %u\n", sg_start, sg_off,
1414                   sg_nents, &rx_desc->data[0], unsol_data_len);
1415
1416         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1417                             unsol_data_len);
1418
1419         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1420         if (rc < 0)
1421                 return rc;
1422
1423         return 0;
1424 }
1425
1426 static int
1427 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1428                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1429                      unsigned char *buf)
1430 {
1431         struct iscsi_conn *conn = isert_conn->conn;
1432         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1433         int rc;
1434
1435         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1436         if (rc < 0)
1437                 return rc;
1438         /*
1439          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1440          */
1441
1442         return iscsit_process_nop_out(conn, cmd, hdr);
1443 }
1444
1445 static int
1446 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1447                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1448                       struct iscsi_text *hdr)
1449 {
1450         struct iscsi_conn *conn = isert_conn->conn;
1451         u32 payload_length = ntoh24(hdr->dlength);
1452         int rc;
1453         unsigned char *text_in = NULL;
1454
1455         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1456         if (rc < 0)
1457                 return rc;
1458
1459         if (payload_length) {
1460                 text_in = kzalloc(payload_length, GFP_KERNEL);
1461                 if (!text_in) {
1462                         isert_err("Unable to allocate text_in of payload_length: %u\n",
1463                                   payload_length);
1464                         return -ENOMEM;
1465                 }
1466         }
1467         cmd->text_in_ptr = text_in;
1468
1469         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1470
1471         return iscsit_process_text_cmd(conn, cmd, hdr);
1472 }
1473
1474 static int
1475 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1476                 uint32_t read_stag, uint64_t read_va,
1477                 uint32_t write_stag, uint64_t write_va)
1478 {
1479         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1480         struct iscsi_conn *conn = isert_conn->conn;
1481         struct iscsi_cmd *cmd;
1482         struct isert_cmd *isert_cmd;
1483         int ret = -EINVAL;
1484         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1485
1486         if (conn->sess->sess_ops->SessionType &&
1487            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1488                 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1489                           " ignoring\n", opcode);
1490                 return 0;
1491         }
1492
1493         switch (opcode) {
1494         case ISCSI_OP_SCSI_CMD:
1495                 cmd = isert_allocate_cmd(conn);
1496                 if (!cmd)
1497                         break;
1498
1499                 isert_cmd = iscsit_priv_cmd(cmd);
1500                 isert_cmd->read_stag = read_stag;
1501                 isert_cmd->read_va = read_va;
1502                 isert_cmd->write_stag = write_stag;
1503                 isert_cmd->write_va = write_va;
1504
1505                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1506                                         rx_desc, (unsigned char *)hdr);
1507                 break;
1508         case ISCSI_OP_NOOP_OUT:
1509                 cmd = isert_allocate_cmd(conn);
1510                 if (!cmd)
1511                         break;
1512
1513                 isert_cmd = iscsit_priv_cmd(cmd);
1514                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1515                                            rx_desc, (unsigned char *)hdr);
1516                 break;
1517         case ISCSI_OP_SCSI_DATA_OUT:
1518                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1519                                                 (unsigned char *)hdr);
1520                 break;
1521         case ISCSI_OP_SCSI_TMFUNC:
1522                 cmd = isert_allocate_cmd(conn);
1523                 if (!cmd)
1524                         break;
1525
1526                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1527                                                 (unsigned char *)hdr);
1528                 break;
1529         case ISCSI_OP_LOGOUT:
1530                 cmd = isert_allocate_cmd(conn);
1531                 if (!cmd)
1532                         break;
1533
1534                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1535                 break;
1536         case ISCSI_OP_TEXT:
1537                 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) {
1538                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1539                         if (!cmd)
1540                                 break;
1541                 } else {
1542                         cmd = isert_allocate_cmd(conn);
1543                         if (!cmd)
1544                                 break;
1545                 }
1546
1547                 isert_cmd = iscsit_priv_cmd(cmd);
1548                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1549                                             rx_desc, (struct iscsi_text *)hdr);
1550                 break;
1551         default:
1552                 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1553                 dump_stack();
1554                 break;
1555         }
1556
1557         return ret;
1558 }
1559
1560 static void
1561 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1562 {
1563         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1564         uint64_t read_va = 0, write_va = 0;
1565         uint32_t read_stag = 0, write_stag = 0;
1566         int rc;
1567
1568         switch (iser_hdr->flags & 0xF0) {
1569         case ISCSI_CTRL:
1570                 if (iser_hdr->flags & ISER_RSV) {
1571                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1572                         read_va = be64_to_cpu(iser_hdr->read_va);
1573                         isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1574                                   read_stag, (unsigned long long)read_va);
1575                 }
1576                 if (iser_hdr->flags & ISER_WSV) {
1577                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1578                         write_va = be64_to_cpu(iser_hdr->write_va);
1579                         isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1580                                   write_stag, (unsigned long long)write_va);
1581                 }
1582
1583                 isert_dbg("ISER ISCSI_CTRL PDU\n");
1584                 break;
1585         case ISER_HELLO:
1586                 isert_err("iSER Hello message\n");
1587                 break;
1588         default:
1589                 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1590                 break;
1591         }
1592
1593         rc = isert_rx_opcode(isert_conn, rx_desc,
1594                              read_stag, read_va, write_stag, write_va);
1595 }
1596
1597 static void
1598 isert_rcv_completion(struct iser_rx_desc *desc,
1599                      struct isert_conn *isert_conn,
1600                      u32 xfer_len)
1601 {
1602         struct ib_device *ib_dev = isert_conn->cm_id->device;
1603         struct iscsi_hdr *hdr;
1604         u64 rx_dma;
1605         int rx_buflen, outstanding;
1606
1607         if ((char *)desc == isert_conn->login_req_buf) {
1608                 rx_dma = isert_conn->login_req_dma;
1609                 rx_buflen = ISER_RX_LOGIN_SIZE;
1610                 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1611                          rx_dma, rx_buflen);
1612         } else {
1613                 rx_dma = desc->dma_addr;
1614                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1615                 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1616                          rx_dma, rx_buflen);
1617         }
1618
1619         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1620
1621         hdr = &desc->iscsi_header;
1622         isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1623                  hdr->opcode, hdr->itt, hdr->flags,
1624                  (int)(xfer_len - ISER_HEADERS_LEN));
1625
1626         if ((char *)desc == isert_conn->login_req_buf) {
1627                 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1628                 if (isert_conn->conn) {
1629                         struct iscsi_login *login = isert_conn->conn->conn_login;
1630
1631                         if (login && !login->first_request)
1632                                 isert_rx_login_req(isert_conn);
1633                 }
1634                 mutex_lock(&isert_conn->mutex);
1635                 complete(&isert_conn->login_req_comp);
1636                 mutex_unlock(&isert_conn->mutex);
1637         } else {
1638                 isert_rx_do_work(desc, isert_conn);
1639         }
1640
1641         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1642                                       DMA_FROM_DEVICE);
1643
1644         isert_conn->post_recv_buf_count--;
1645         isert_dbg("Decremented post_recv_buf_count: %d\n",
1646                   isert_conn->post_recv_buf_count);
1647
1648         if ((char *)desc == isert_conn->login_req_buf)
1649                 return;
1650
1651         outstanding = isert_conn->post_recv_buf_count;
1652         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1653                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1654                                 ISERT_MIN_POSTED_RX);
1655                 err = isert_post_recv(isert_conn, count);
1656                 if (err) {
1657                         isert_err("isert_post_recv() count: %d failed, %d\n",
1658                                count, err);
1659                 }
1660         }
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 = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2173                            &wr_failed);
2174         if (ret) {
2175                 isert_err("ib_post_send failed with %d\n", ret);
2176                 return ret;
2177         }
2178         return ret;
2179 }
2180
2181 static int
2182 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2183 {
2184         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2185         struct isert_conn *isert_conn = conn->context;
2186         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2187         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2188                                 &isert_cmd->tx_desc.iscsi_header;
2189
2190         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2191         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2192         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2193         /*
2194          * Attach SENSE DATA payload to iSCSI Response PDU
2195          */
2196         if (cmd->se_cmd.sense_buffer &&
2197             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2198             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2199                 struct isert_device *device = isert_conn->device;
2200                 struct ib_device *ib_dev = device->ib_device;
2201                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2202                 u32 padding, pdu_len;
2203
2204                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2205                                    cmd->sense_buffer);
2206                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2207
2208                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2209                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2210                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2211
2212                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2213                                 (void *)cmd->sense_buffer, pdu_len,
2214                                 DMA_TO_DEVICE);
2215
2216                 isert_cmd->pdu_buf_len = pdu_len;
2217                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2218                 tx_dsg->length  = pdu_len;
2219                 tx_dsg->lkey    = device->mr->lkey;
2220                 isert_cmd->tx_desc.num_sge = 2;
2221         }
2222
2223         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2224
2225         isert_dbg("Posting SCSI Response\n");
2226
2227         return isert_post_response(isert_conn, isert_cmd);
2228 }
2229
2230 static void
2231 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2232 {
2233         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2234         struct isert_conn *isert_conn = conn->context;
2235         struct isert_device *device = isert_conn->device;
2236
2237         spin_lock_bh(&conn->cmd_lock);
2238         if (!list_empty(&cmd->i_conn_node))
2239                 list_del_init(&cmd->i_conn_node);
2240         spin_unlock_bh(&conn->cmd_lock);
2241
2242         if (cmd->data_direction == DMA_TO_DEVICE)
2243                 iscsit_stop_dataout_timer(cmd);
2244
2245         device->unreg_rdma_mem(isert_cmd, isert_conn);
2246 }
2247
2248 static enum target_prot_op
2249 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2250 {
2251         struct isert_conn *isert_conn = conn->context;
2252         struct isert_device *device = isert_conn->device;
2253
2254         if (conn->tpg->tpg_attrib.t10_pi) {
2255                 if (device->pi_capable) {
2256                         isert_info("conn %p PI offload enabled\n", isert_conn);
2257                         isert_conn->pi_support = true;
2258                         return TARGET_PROT_ALL;
2259                 }
2260         }
2261
2262         isert_info("conn %p PI offload disabled\n", isert_conn);
2263         isert_conn->pi_support = false;
2264
2265         return TARGET_PROT_NORMAL;
2266 }
2267
2268 static int
2269 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2270                 bool nopout_response)
2271 {
2272         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2273         struct isert_conn *isert_conn = conn->context;
2274         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2275
2276         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2277         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2278                                &isert_cmd->tx_desc.iscsi_header,
2279                                nopout_response);
2280         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2281         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2282
2283         isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2284
2285         return isert_post_response(isert_conn, isert_cmd);
2286 }
2287
2288 static int
2289 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2290 {
2291         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2292         struct isert_conn *isert_conn = conn->context;
2293         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2294
2295         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2296         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2297                                 &isert_cmd->tx_desc.iscsi_header);
2298         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2299         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2300
2301         isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2302
2303         return isert_post_response(isert_conn, isert_cmd);
2304 }
2305
2306 static int
2307 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2308 {
2309         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2310         struct isert_conn *isert_conn = conn->context;
2311         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2312
2313         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2314         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2315                                   &isert_cmd->tx_desc.iscsi_header);
2316         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2317         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2318
2319         isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2320
2321         return isert_post_response(isert_conn, isert_cmd);
2322 }
2323
2324 static int
2325 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2328         struct isert_conn *isert_conn = conn->context;
2329         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2330         struct isert_device *device = isert_conn->device;
2331         struct ib_device *ib_dev = device->ib_device;
2332         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2333         struct iscsi_reject *hdr =
2334                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2335
2336         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2337         iscsit_build_reject(cmd, conn, hdr);
2338         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2339
2340         hton24(hdr->dlength, ISCSI_HDR_LEN);
2341         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2342                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2343                         DMA_TO_DEVICE);
2344         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2345         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2346         tx_dsg->length  = ISCSI_HDR_LEN;
2347         tx_dsg->lkey    = device->mr->lkey;
2348         isert_cmd->tx_desc.num_sge = 2;
2349
2350         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2351
2352         isert_dbg("conn %p Posting Reject\n", isert_conn);
2353
2354         return isert_post_response(isert_conn, isert_cmd);
2355 }
2356
2357 static int
2358 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2359 {
2360         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2361         struct isert_conn *isert_conn = conn->context;
2362         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2363         struct iscsi_text_rsp *hdr =
2364                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2365         u32 txt_rsp_len;
2366         int rc;
2367
2368         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2369         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2370         if (rc < 0)
2371                 return rc;
2372
2373         txt_rsp_len = rc;
2374         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2375
2376         if (txt_rsp_len) {
2377                 struct isert_device *device = isert_conn->device;
2378                 struct ib_device *ib_dev = device->ib_device;
2379                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2380                 void *txt_rsp_buf = cmd->buf_ptr;
2381
2382                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2383                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2384
2385                 isert_cmd->pdu_buf_len = txt_rsp_len;
2386                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2387                 tx_dsg->length  = txt_rsp_len;
2388                 tx_dsg->lkey    = device->mr->lkey;
2389                 isert_cmd->tx_desc.num_sge = 2;
2390         }
2391         isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2392
2393         isert_dbg("conn %p Text Response\n", isert_conn);
2394
2395         return isert_post_response(isert_conn, isert_cmd);
2396 }
2397
2398 static int
2399 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2400                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2401                     u32 data_left, u32 offset)
2402 {
2403         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2404         struct scatterlist *sg_start, *tmp_sg;
2405         struct isert_device *device = isert_conn->device;
2406         struct ib_device *ib_dev = device->ib_device;
2407         u32 sg_off, page_off;
2408         int i = 0, sg_nents;
2409
2410         sg_off = offset / PAGE_SIZE;
2411         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2412         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2413         page_off = offset % PAGE_SIZE;
2414
2415         send_wr->sg_list = ib_sge;
2416         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2417         /*
2418          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2419          */
2420         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2421                 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2422                           "page_off: %u\n",
2423                           (unsigned long long)tmp_sg->dma_address,
2424                           tmp_sg->length, page_off);
2425
2426                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2427                 ib_sge->length = min_t(u32, data_left,
2428                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2429                 ib_sge->lkey = device->mr->lkey;
2430
2431                 isert_dbg("RDMA ib_sge: addr: 0x%llx  length: %u lkey: %x\n",
2432                           ib_sge->addr, ib_sge->length, ib_sge->lkey);
2433                 page_off = 0;
2434                 data_left -= ib_sge->length;
2435                 if (!data_left)
2436                         break;
2437                 ib_sge++;
2438                 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2439         }
2440
2441         send_wr->num_sge = ++i;
2442         isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2443                   send_wr->sg_list, send_wr->num_sge);
2444
2445         return send_wr->num_sge;
2446 }
2447
2448 static int
2449 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2450                struct isert_rdma_wr *wr)
2451 {
2452         struct se_cmd *se_cmd = &cmd->se_cmd;
2453         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2454         struct isert_conn *isert_conn = conn->context;
2455         struct isert_data_buf *data = &wr->data;
2456         struct ib_send_wr *send_wr;
2457         struct ib_sge *ib_sge;
2458         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2459         int ret = 0, i, ib_sge_cnt;
2460
2461         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2462
2463         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2464         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2465                                  se_cmd->t_data_nents, se_cmd->data_length,
2466                                  offset, wr->iser_ib_op, &wr->data);
2467         if (ret)
2468                 return ret;
2469
2470         data_left = data->len;
2471         offset = data->offset;
2472
2473         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2474         if (!ib_sge) {
2475                 isert_warn("Unable to allocate ib_sge\n");
2476                 ret = -ENOMEM;
2477                 goto unmap_cmd;
2478         }
2479         wr->ib_sge = ib_sge;
2480
2481         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2482         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2483                                 GFP_KERNEL);
2484         if (!wr->send_wr) {
2485                 isert_dbg("Unable to allocate wr->send_wr\n");
2486                 ret = -ENOMEM;
2487                 goto unmap_cmd;
2488         }
2489
2490         wr->isert_cmd = isert_cmd;
2491         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2492
2493         for (i = 0; i < wr->send_wr_num; i++) {
2494                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2495                 data_len = min(data_left, rdma_write_max);
2496
2497                 send_wr->send_flags = 0;
2498                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2499                         send_wr->opcode = IB_WR_RDMA_WRITE;
2500                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2501                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2502                         if (i + 1 == wr->send_wr_num)
2503                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2504                         else
2505                                 send_wr->next = &wr->send_wr[i + 1];
2506                 } else {
2507                         send_wr->opcode = IB_WR_RDMA_READ;
2508                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2509                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2510                         if (i + 1 == wr->send_wr_num)
2511                                 send_wr->send_flags = IB_SEND_SIGNALED;
2512                         else
2513                                 send_wr->next = &wr->send_wr[i + 1];
2514                 }
2515
2516                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2517                                         send_wr, data_len, offset);
2518                 ib_sge += ib_sge_cnt;
2519
2520                 offset += data_len;
2521                 va_offset += data_len;
2522                 data_left -= data_len;
2523         }
2524
2525         return 0;
2526 unmap_cmd:
2527         isert_unmap_data_buf(isert_conn, data);
2528
2529         return ret;
2530 }
2531
2532 static int
2533 isert_map_fr_pagelist(struct ib_device *ib_dev,
2534                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2535 {
2536         u64 start_addr, end_addr, page, chunk_start = 0;
2537         struct scatterlist *tmp_sg;
2538         int i = 0, new_chunk, last_ent, n_pages;
2539
2540         n_pages = 0;
2541         new_chunk = 1;
2542         last_ent = sg_nents - 1;
2543         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2544                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2545                 if (new_chunk)
2546                         chunk_start = start_addr;
2547                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2548
2549                 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
2550                           i, (unsigned long long)tmp_sg->dma_address,
2551                           tmp_sg->length);
2552
2553                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2554                         new_chunk = 0;
2555                         continue;
2556                 }
2557                 new_chunk = 1;
2558
2559                 page = chunk_start & PAGE_MASK;
2560                 do {
2561                         fr_pl[n_pages++] = page;
2562                         isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
2563                                   n_pages - 1, page);
2564                         page += PAGE_SIZE;
2565                 } while (page < end_addr);
2566         }
2567
2568         return n_pages;
2569 }
2570
2571 static inline void
2572 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2573 {
2574         u32 rkey;
2575
2576         memset(inv_wr, 0, sizeof(*inv_wr));
2577         inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2578         inv_wr->opcode = IB_WR_LOCAL_INV;
2579         inv_wr->ex.invalidate_rkey = mr->rkey;
2580
2581         /* Bump the key */
2582         rkey = ib_inc_rkey(mr->rkey);
2583         ib_update_fast_reg_key(mr, rkey);
2584 }
2585
2586 static int
2587 isert_fast_reg_mr(struct isert_conn *isert_conn,
2588                   struct fast_reg_descriptor *fr_desc,
2589                   struct isert_data_buf *mem,
2590                   enum isert_indicator ind,
2591                   struct ib_sge *sge)
2592 {
2593         struct isert_device *device = isert_conn->device;
2594         struct ib_device *ib_dev = device->ib_device;
2595         struct ib_mr *mr;
2596         struct ib_fast_reg_page_list *frpl;
2597         struct ib_send_wr fr_wr, inv_wr;
2598         struct ib_send_wr *bad_wr, *wr = NULL;
2599         int ret, pagelist_len;
2600         u32 page_off;
2601
2602         if (mem->dma_nents == 1) {
2603                 sge->lkey = device->mr->lkey;
2604                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2605                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2606                 isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2607                          sge->addr, sge->length, sge->lkey);
2608                 return 0;
2609         }
2610
2611         if (ind == ISERT_DATA_KEY_VALID) {
2612                 /* Registering data buffer */
2613                 mr = fr_desc->data_mr;
2614                 frpl = fr_desc->data_frpl;
2615         } else {
2616                 /* Registering protection buffer */
2617                 mr = fr_desc->pi_ctx->prot_mr;
2618                 frpl = fr_desc->pi_ctx->prot_frpl;
2619         }
2620
2621         page_off = mem->offset % PAGE_SIZE;
2622
2623         isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2624                   fr_desc, mem->nents, mem->offset);
2625
2626         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2627                                              &frpl->page_list[0]);
2628
2629         if (!(fr_desc->ind & ind)) {
2630                 isert_inv_rkey(&inv_wr, mr);
2631                 wr = &inv_wr;
2632         }
2633
2634         /* Prepare FASTREG WR */
2635         memset(&fr_wr, 0, sizeof(fr_wr));
2636         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2637         fr_wr.opcode = IB_WR_FAST_REG_MR;
2638         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2639         fr_wr.wr.fast_reg.page_list = frpl;
2640         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2641         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2642         fr_wr.wr.fast_reg.length = mem->len;
2643         fr_wr.wr.fast_reg.rkey = mr->rkey;
2644         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2645
2646         if (!wr)
2647                 wr = &fr_wr;
2648         else
2649                 wr->next = &fr_wr;
2650
2651         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2652         if (ret) {
2653                 isert_err("fast registration failed, ret:%d\n", ret);
2654                 return ret;
2655         }
2656         fr_desc->ind &= ~ind;
2657
2658         sge->lkey = mr->lkey;
2659         sge->addr = frpl->page_list[0] + page_off;
2660         sge->length = mem->len;
2661
2662         isert_dbg("sge: addr: 0x%llx  length: %u lkey: %x\n",
2663                   sge->addr, sge->length, sge->lkey);
2664
2665         return ret;
2666 }
2667
2668 static inline void
2669 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2670                      struct ib_sig_domain *domain)
2671 {
2672         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2673         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2674         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2675         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2676         /*
2677          * At the moment we hard code those, but if in the future
2678          * the target core would like to use it, we will take it
2679          * from se_cmd.
2680          */
2681         domain->sig.dif.apptag_check_mask = 0xffff;
2682         domain->sig.dif.app_escape = true;
2683         domain->sig.dif.ref_escape = true;
2684         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2685             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2686                 domain->sig.dif.ref_remap = true;
2687 };
2688
2689 static int
2690 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2691 {
2692         switch (se_cmd->prot_op) {
2693         case TARGET_PROT_DIN_INSERT:
2694         case TARGET_PROT_DOUT_STRIP:
2695                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2696                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2697                 break;
2698         case TARGET_PROT_DOUT_INSERT:
2699         case TARGET_PROT_DIN_STRIP:
2700                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2701                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2702                 break;
2703         case TARGET_PROT_DIN_PASS:
2704         case TARGET_PROT_DOUT_PASS:
2705                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2706                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2707                 break;
2708         default:
2709                 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2710                 return -EINVAL;
2711         }
2712
2713         return 0;
2714 }
2715
2716 static inline u8
2717 isert_set_prot_checks(u8 prot_checks)
2718 {
2719         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2720                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2721                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2722 }
2723
2724 static int
2725 isert_reg_sig_mr(struct isert_conn *isert_conn,
2726                  struct se_cmd *se_cmd,
2727                  struct isert_rdma_wr *rdma_wr,
2728                  struct fast_reg_descriptor *fr_desc)
2729 {
2730         struct ib_send_wr sig_wr, inv_wr;
2731         struct ib_send_wr *bad_wr, *wr = NULL;
2732         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2733         struct ib_sig_attrs sig_attrs;
2734         int ret;
2735
2736         memset(&sig_attrs, 0, sizeof(sig_attrs));
2737         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2738         if (ret)
2739                 goto err;
2740
2741         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2742
2743         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2744                 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2745                 wr = &inv_wr;
2746         }
2747
2748         memset(&sig_wr, 0, sizeof(sig_wr));
2749         sig_wr.opcode = IB_WR_REG_SIG_MR;
2750         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2751         sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2752         sig_wr.num_sge = 1;
2753         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2754         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2755         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2756         if (se_cmd->t_prot_sg)
2757                 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2758
2759         if (!wr)
2760                 wr = &sig_wr;
2761         else
2762                 wr->next = &sig_wr;
2763
2764         ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2765         if (ret) {
2766                 isert_err("fast registration failed, ret:%d\n", ret);
2767                 goto err;
2768         }
2769         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2770
2771         rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2772         rdma_wr->ib_sg[SIG].addr = 0;
2773         rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2774         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2775             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2776                 /*
2777                  * We have protection guards on the wire
2778                  * so we need to set a larget transfer
2779                  */
2780                 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2781
2782         isert_dbg("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2783                   rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2784                   rdma_wr->ib_sg[SIG].lkey);
2785 err:
2786         return ret;
2787 }
2788
2789 static int
2790 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2791                       struct isert_cmd *isert_cmd,
2792                       struct isert_rdma_wr *wr)
2793 {
2794         struct isert_device *device = isert_conn->device;
2795         struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2796         int ret;
2797
2798         if (!wr->fr_desc->pi_ctx) {
2799                 ret = isert_create_pi_ctx(wr->fr_desc,
2800                                           device->ib_device,
2801                                           device->pd);
2802                 if (ret) {
2803                         isert_err("conn %p failed to allocate pi_ctx\n",
2804                                   isert_conn);
2805                         return ret;
2806                 }
2807         }
2808
2809         if (se_cmd->t_prot_sg) {
2810                 ret = isert_map_data_buf(isert_conn, isert_cmd,
2811                                          se_cmd->t_prot_sg,
2812                                          se_cmd->t_prot_nents,
2813                                          se_cmd->prot_length,
2814                                          0, wr->iser_ib_op, &wr->prot);
2815                 if (ret) {
2816                         isert_err("conn %p failed to map protection buffer\n",
2817                                   isert_conn);
2818                         return ret;
2819                 }
2820
2821                 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2822                 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2823                                         ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2824                 if (ret) {
2825                         isert_err("conn %p failed to fast reg mr\n",
2826                                   isert_conn);
2827                         goto unmap_prot_cmd;
2828                 }
2829         }
2830
2831         ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2832         if (ret) {
2833                 isert_err("conn %p failed to fast reg mr\n",
2834                           isert_conn);
2835                 goto unmap_prot_cmd;
2836         }
2837         wr->fr_desc->ind |= ISERT_PROTECTED;
2838
2839         return 0;
2840
2841 unmap_prot_cmd:
2842         if (se_cmd->t_prot_sg)
2843                 isert_unmap_data_buf(isert_conn, &wr->prot);
2844
2845         return ret;
2846 }
2847
2848 static int
2849 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2850                struct isert_rdma_wr *wr)
2851 {
2852         struct se_cmd *se_cmd = &cmd->se_cmd;
2853         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2854         struct isert_conn *isert_conn = conn->context;
2855         struct fast_reg_descriptor *fr_desc = NULL;
2856         struct ib_send_wr *send_wr;
2857         struct ib_sge *ib_sg;
2858         u32 offset;
2859         int ret = 0;
2860         unsigned long flags;
2861
2862         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2863
2864         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2865         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2866                                  se_cmd->t_data_nents, se_cmd->data_length,
2867                                  offset, wr->iser_ib_op, &wr->data);
2868         if (ret)
2869                 return ret;
2870
2871         if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2872                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2873                 fr_desc = list_first_entry(&isert_conn->fr_pool,
2874                                            struct fast_reg_descriptor, list);
2875                 list_del(&fr_desc->list);
2876                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2877                 wr->fr_desc = fr_desc;
2878         }
2879
2880         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2881                                 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2882         if (ret)
2883                 goto unmap_cmd;
2884
2885         if (isert_prot_cmd(isert_conn, se_cmd)) {
2886                 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2887                 if (ret)
2888                         goto unmap_cmd;
2889
2890                 ib_sg = &wr->ib_sg[SIG];
2891         } else {
2892                 ib_sg = &wr->ib_sg[DATA];
2893         }
2894
2895         memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2896         wr->ib_sge = &wr->s_ib_sge;
2897         wr->send_wr_num = 1;
2898         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2899         wr->send_wr = &wr->s_send_wr;
2900         wr->isert_cmd = isert_cmd;
2901
2902         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2903         send_wr->sg_list = &wr->s_ib_sge;
2904         send_wr->num_sge = 1;
2905         send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2906         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2907                 send_wr->opcode = IB_WR_RDMA_WRITE;
2908                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2909                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2910                 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2911                                       0 : IB_SEND_SIGNALED;
2912         } else {
2913                 send_wr->opcode = IB_WR_RDMA_READ;
2914                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2915                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2916                 send_wr->send_flags = IB_SEND_SIGNALED;
2917         }
2918
2919         return 0;
2920
2921 unmap_cmd:
2922         if (fr_desc) {
2923                 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2924                 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2925                 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2926         }
2927         isert_unmap_data_buf(isert_conn, &wr->data);
2928
2929         return ret;
2930 }
2931
2932 static int
2933 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2934 {
2935         struct se_cmd *se_cmd = &cmd->se_cmd;
2936         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2937         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2938         struct isert_conn *isert_conn = conn->context;
2939         struct isert_device *device = isert_conn->device;
2940         struct ib_send_wr *wr_failed;
2941         int rc;
2942
2943         isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2944                  isert_cmd, se_cmd->data_length);
2945
2946         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2947         rc = device->reg_rdma_mem(conn, cmd, wr);
2948         if (rc) {
2949                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2950                 return rc;
2951         }
2952
2953         if (!isert_prot_cmd(isert_conn, se_cmd)) {
2954                 /*
2955                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2956                  */
2957                 isert_create_send_desc(isert_conn, isert_cmd,
2958                                        &isert_cmd->tx_desc);
2959                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2960                                      &isert_cmd->tx_desc.iscsi_header);
2961                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2962                 isert_init_send_wr(isert_conn, isert_cmd,
2963                                    &isert_cmd->tx_desc.send_wr);
2964                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2965                 wr->send_wr_num += 1;
2966         }
2967
2968         rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2969         if (rc)
2970                 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2971
2972         if (!isert_prot_cmd(isert_conn, se_cmd))
2973                 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2974                          "READ\n", isert_cmd);
2975         else
2976                 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2977                          isert_cmd);
2978
2979         return 1;
2980 }
2981
2982 static int
2983 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2984 {
2985         struct se_cmd *se_cmd = &cmd->se_cmd;
2986         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2987         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2988         struct isert_conn *isert_conn = conn->context;
2989         struct isert_device *device = isert_conn->device;
2990         struct ib_send_wr *wr_failed;
2991         int rc;
2992
2993         isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2994                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2995         wr->iser_ib_op = ISER_IB_RDMA_READ;
2996         rc = device->reg_rdma_mem(conn, cmd, wr);
2997         if (rc) {
2998                 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2999                 return rc;
3000         }
3001
3002         rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
3003         if (rc)
3004                 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
3005
3006         isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
3007                  isert_cmd);
3008
3009         return 0;
3010 }
3011
3012 static int
3013 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3014 {
3015         int ret;
3016
3017         switch (state) {
3018         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3019                 ret = isert_put_nopin(cmd, conn, false);
3020                 break;
3021         default:
3022                 isert_err("Unknown immediate state: 0x%02x\n", state);
3023                 ret = -EINVAL;
3024                 break;
3025         }
3026
3027         return ret;
3028 }
3029
3030 static int
3031 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3032 {
3033         struct isert_conn *isert_conn = conn->context;
3034         int ret;
3035
3036         switch (state) {
3037         case ISTATE_SEND_LOGOUTRSP:
3038                 ret = isert_put_logout_rsp(cmd, conn);
3039                 if (!ret)
3040                         isert_conn->logout_posted = true;
3041                 break;
3042         case ISTATE_SEND_NOPIN:
3043                 ret = isert_put_nopin(cmd, conn, true);
3044                 break;
3045         case ISTATE_SEND_TASKMGTRSP:
3046                 ret = isert_put_tm_rsp(cmd, conn);
3047                 break;
3048         case ISTATE_SEND_REJECT:
3049                 ret = isert_put_reject(cmd, conn);
3050                 break;
3051         case ISTATE_SEND_TEXTRSP:
3052                 ret = isert_put_text_rsp(cmd, conn);
3053                 break;
3054         case ISTATE_SEND_STATUS:
3055                 /*
3056                  * Special case for sending non GOOD SCSI status from TX thread
3057                  * context during pre se_cmd excecution failure.
3058                  */
3059                 ret = isert_put_response(conn, cmd);
3060                 break;
3061         default:
3062                 isert_err("Unknown response state: 0x%02x\n", state);
3063                 ret = -EINVAL;
3064                 break;
3065         }
3066
3067         return ret;
3068 }
3069
3070 struct rdma_cm_id *
3071 isert_setup_id(struct isert_np *isert_np)
3072 {
3073         struct iscsi_np *np = isert_np->np;
3074         struct rdma_cm_id *id;
3075         struct sockaddr *sa;
3076         int ret;
3077
3078         sa = (struct sockaddr *)&np->np_sockaddr;
3079         isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3080
3081         id = rdma_create_id(isert_cma_handler, isert_np,
3082                             RDMA_PS_TCP, IB_QPT_RC);
3083         if (IS_ERR(id)) {
3084                 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3085                 ret = PTR_ERR(id);
3086                 goto out;
3087         }
3088         isert_dbg("id %p context %p\n", id, id->context);
3089
3090         ret = rdma_bind_addr(id, sa);
3091         if (ret) {
3092                 isert_err("rdma_bind_addr() failed: %d\n", ret);
3093                 goto out_id;
3094         }
3095
3096         ret = rdma_listen(id, 0);
3097         if (ret) {
3098                 isert_err("rdma_listen() failed: %d\n", ret);
3099                 goto out_id;
3100         }
3101
3102         return id;
3103 out_id:
3104         rdma_destroy_id(id);
3105 out:
3106         return ERR_PTR(ret);
3107 }
3108
3109 static int
3110 isert_setup_np(struct iscsi_np *np,
3111                struct __kernel_sockaddr_storage *ksockaddr)
3112 {
3113         struct isert_np *isert_np;
3114         struct rdma_cm_id *isert_lid;
3115         int ret;
3116
3117         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3118         if (!isert_np) {
3119                 isert_err("Unable to allocate struct isert_np\n");
3120                 return -ENOMEM;
3121         }
3122         sema_init(&isert_np->np_sem, 0);
3123         mutex_init(&isert_np->np_accept_mutex);
3124         INIT_LIST_HEAD(&isert_np->np_accept_list);
3125         init_completion(&isert_np->np_login_comp);
3126         isert_np->np = np;
3127
3128         /*
3129          * Setup the np->np_sockaddr from the passed sockaddr setup
3130          * in iscsi_target_configfs.c code..
3131          */
3132         memcpy(&np->np_sockaddr, ksockaddr,
3133                sizeof(struct __kernel_sockaddr_storage));
3134
3135         isert_lid = isert_setup_id(isert_np);
3136         if (IS_ERR(isert_lid)) {
3137                 ret = PTR_ERR(isert_lid);
3138                 goto out;
3139         }
3140
3141         isert_np->np_cm_id = isert_lid;
3142         np->np_context = isert_np;
3143
3144         return 0;
3145
3146 out:
3147         kfree(isert_np);
3148
3149         return ret;
3150 }
3151
3152 static int
3153 isert_rdma_accept(struct isert_conn *isert_conn)
3154 {
3155         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3156         struct rdma_conn_param cp;
3157         int ret;
3158
3159         memset(&cp, 0, sizeof(struct rdma_conn_param));
3160         cp.initiator_depth = isert_conn->initiator_depth;
3161         cp.retry_count = 7;
3162         cp.rnr_retry_count = 7;
3163
3164         ret = rdma_accept(cm_id, &cp);
3165         if (ret) {
3166                 isert_err("rdma_accept() failed with: %d\n", ret);
3167                 return ret;
3168         }
3169
3170         return 0;
3171 }
3172
3173 static int
3174 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3175 {
3176         struct isert_conn *isert_conn = conn->context;
3177         int ret;
3178
3179         isert_info("before login_req comp conn: %p\n", isert_conn);
3180         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3181         if (ret) {
3182                 isert_err("isert_conn %p interrupted before got login req\n",
3183                           isert_conn);
3184                 return ret;
3185         }
3186         reinit_completion(&isert_conn->login_req_comp);
3187
3188         /*
3189          * For login requests after the first PDU, isert_rx_login_req() will
3190          * kick schedule_delayed_work(&conn->login_work) as the packet is
3191          * received, which turns this callback from iscsi_target_do_login_rx()
3192          * into a NOP.
3193          */
3194         if (!login->first_request)
3195                 return 0;
3196
3197         isert_rx_login_req(isert_conn);
3198
3199         isert_info("before login_comp conn: %p\n", conn);
3200         ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3201         if (ret)
3202                 return ret;
3203
3204         isert_info("processing login->req: %p\n", login->req);
3205
3206         return 0;
3207 }
3208
3209 static void
3210 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3211                     struct isert_conn *isert_conn)
3212 {
3213         struct rdma_cm_id *cm_id = isert_conn->cm_id;
3214         struct rdma_route *cm_route = &cm_id->route;
3215         struct sockaddr_in *sock_in;
3216         struct sockaddr_in6 *sock_in6;
3217
3218         conn->login_family = np->np_sockaddr.ss_family;
3219
3220         if (np->np_sockaddr.ss_family == AF_INET6) {
3221                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3222                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3223                          &sock_in6->sin6_addr.in6_u);
3224                 conn->login_port = ntohs(sock_in6->sin6_port);
3225
3226                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3227                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3228                          &sock_in6->sin6_addr.in6_u);
3229                 conn->local_port = ntohs(sock_in6->sin6_port);
3230         } else {
3231                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3232                 sprintf(conn->login_ip, "%pI4",
3233                         &sock_in->sin_addr.s_addr);
3234                 conn->login_port = ntohs(sock_in->sin_port);
3235
3236                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3237                 sprintf(conn->local_ip, "%pI4",
3238                         &sock_in->sin_addr.s_addr);
3239                 conn->local_port = ntohs(sock_in->sin_port);
3240         }
3241 }
3242
3243 static int
3244 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3245 {
3246         struct isert_np *isert_np = np->np_context;
3247         struct isert_conn *isert_conn;
3248         int ret;
3249
3250 accept_wait:
3251         ret = down_interruptible(&isert_np->np_sem);
3252         if (ret)
3253                 return -ENODEV;
3254
3255         spin_lock_bh(&np->np_thread_lock);
3256         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3257                 spin_unlock_bh(&np->np_thread_lock);
3258                 isert_dbg("np_thread_state %d\n",
3259                          np->np_thread_state);
3260                 /**
3261                  * No point in stalling here when np_thread
3262                  * is in state RESET/SHUTDOWN/EXIT - bail
3263                  **/
3264                 return -ENODEV;
3265         }
3266         spin_unlock_bh(&np->np_thread_lock);
3267
3268         mutex_lock(&isert_np->np_accept_mutex);
3269         if (list_empty(&isert_np->np_accept_list)) {
3270                 mutex_unlock(&isert_np->np_accept_mutex);
3271                 goto accept_wait;
3272         }
3273         isert_conn = list_first_entry(&isert_np->np_accept_list,
3274                         struct isert_conn, accept_node);
3275         list_del_init(&isert_conn->accept_node);
3276         mutex_unlock(&isert_np->np_accept_mutex);
3277
3278         conn->context = isert_conn;
3279         isert_conn->conn = conn;
3280
3281         isert_set_conn_info(np, conn, isert_conn);
3282
3283         isert_dbg("Processing isert_conn: %p\n", isert_conn);
3284
3285         return 0;
3286 }
3287
3288 static void
3289 isert_free_np(struct iscsi_np *np)
3290 {
3291         struct isert_np *isert_np = np->np_context;
3292         struct isert_conn *isert_conn, *n;
3293
3294         if (isert_np->np_cm_id)
3295                 rdma_destroy_id(isert_np->np_cm_id);
3296
3297         /*
3298          * FIXME: At this point we don't have a good way to insure
3299          * that at this point we don't have hanging connections that
3300          * completed RDMA establishment but didn't start iscsi login
3301          * process. So work-around this by cleaning up what ever piled
3302          * up in np_accept_list.
3303          */
3304         mutex_lock(&isert_np->np_accept_mutex);
3305         if (!list_empty(&isert_np->np_accept_list)) {
3306                 isert_info("Still have isert connections, cleaning up...\n");
3307                 list_for_each_entry_safe(isert_conn, n,
3308                                          &isert_np->np_accept_list,
3309                                          accept_node) {
3310                         isert_info("cleaning isert_conn %p state (%d)\n",
3311                                    isert_conn, isert_conn->state);
3312                         isert_connect_release(isert_conn);
3313                 }
3314         }
3315         mutex_unlock(&isert_np->np_accept_mutex);
3316
3317         np->np_context = NULL;
3318         kfree(isert_np);
3319 }
3320
3321 static void isert_release_work(struct work_struct *work)
3322 {
3323         struct isert_conn *isert_conn = container_of(work,
3324                                                      struct isert_conn,
3325                                                      release_work);
3326
3327         isert_info("Starting release conn %p\n", isert_conn);
3328
3329         wait_for_completion(&isert_conn->wait);
3330
3331         mutex_lock(&isert_conn->mutex);
3332         isert_conn->state = ISER_CONN_DOWN;
3333         mutex_unlock(&isert_conn->mutex);
3334
3335         isert_info("Destroying conn %p\n", isert_conn);
3336         isert_put_conn(isert_conn);
3337 }
3338
3339 static void
3340 isert_wait4logout(struct isert_conn *isert_conn)
3341 {
3342         struct iscsi_conn *conn = isert_conn->conn;
3343
3344         isert_info("conn %p\n", isert_conn);
3345
3346         if (isert_conn->logout_posted) {
3347                 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3348                 wait_for_completion_timeout(&conn->conn_logout_comp,
3349                                             SECONDS_FOR_LOGOUT_COMP * HZ);
3350         }
3351 }
3352
3353 static void
3354 isert_wait4cmds(struct iscsi_conn *conn)
3355 {
3356         isert_info("iscsi_conn %p\n", conn);
3357
3358         if (conn->sess) {
3359                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3360                 target_wait_for_sess_cmds(conn->sess->se_sess);
3361         }
3362 }
3363
3364 static void
3365 isert_wait4flush(struct isert_conn *isert_conn)
3366 {
3367         struct ib_recv_wr *bad_wr;
3368
3369         isert_info("conn %p\n", isert_conn);
3370
3371         init_completion(&isert_conn->wait_comp_err);
3372         isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3373         /* post an indication that all flush errors were consumed */
3374         if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3375                 isert_err("conn %p failed to post beacon", isert_conn);
3376                 return;
3377         }
3378
3379         wait_for_completion(&isert_conn->wait_comp_err);
3380 }
3381
3382 static void isert_wait_conn(struct iscsi_conn *conn)
3383 {
3384         struct isert_conn *isert_conn = conn->context;
3385
3386         isert_info("Starting conn %p\n", isert_conn);
3387
3388         mutex_lock(&isert_conn->mutex);
3389         /*
3390          * Only wait for wait_comp_err if the isert_conn made it
3391          * into full feature phase..
3392          */
3393         if (isert_conn->state == ISER_CONN_INIT) {
3394                 mutex_unlock(&isert_conn->mutex);
3395                 return;
3396         }
3397         isert_conn_terminate(isert_conn);
3398         mutex_unlock(&isert_conn->mutex);
3399
3400         isert_wait4cmds(conn);
3401         isert_wait4flush(isert_conn);
3402         isert_wait4logout(isert_conn);
3403
3404         queue_work(isert_release_wq, &isert_conn->release_work);
3405 }
3406
3407 static void isert_free_conn(struct iscsi_conn *conn)
3408 {
3409         struct isert_conn *isert_conn = conn->context;
3410
3411         isert_wait4flush(isert_conn);
3412         isert_put_conn(isert_conn);
3413 }
3414
3415 static struct iscsit_transport iser_target_transport = {
3416         .name                   = "IB/iSER",
3417         .transport_type         = ISCSI_INFINIBAND,
3418         .priv_size              = sizeof(struct isert_cmd),
3419         .owner                  = THIS_MODULE,
3420         .iscsit_setup_np        = isert_setup_np,
3421         .iscsit_accept_np       = isert_accept_np,
3422         .iscsit_free_np         = isert_free_np,
3423         .iscsit_wait_conn       = isert_wait_conn,
3424         .iscsit_free_conn       = isert_free_conn,
3425         .iscsit_get_login_rx    = isert_get_login_rx,
3426         .iscsit_put_login_tx    = isert_put_login_tx,
3427         .iscsit_immediate_queue = isert_immediate_queue,
3428         .iscsit_response_queue  = isert_response_queue,
3429         .iscsit_get_dataout     = isert_get_dataout,
3430         .iscsit_queue_data_in   = isert_put_datain,
3431         .iscsit_queue_status    = isert_put_response,
3432         .iscsit_aborted_task    = isert_aborted_task,
3433         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3434 };
3435
3436 static int __init isert_init(void)
3437 {
3438         int ret;
3439
3440         isert_comp_wq = alloc_workqueue("isert_comp_wq",
3441                                         WQ_UNBOUND | WQ_HIGHPRI, 0);
3442         if (!isert_comp_wq) {
3443                 isert_err("Unable to allocate isert_comp_wq\n");
3444                 ret = -ENOMEM;
3445                 return -ENOMEM;
3446         }
3447
3448         isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3449                                         WQ_UNBOUND_MAX_ACTIVE);
3450         if (!isert_release_wq) {
3451                 isert_err("Unable to allocate isert_release_wq\n");
3452                 ret = -ENOMEM;
3453                 goto destroy_comp_wq;
3454         }
3455
3456         iscsit_register_transport(&iser_target_transport);
3457         isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3458
3459         return 0;
3460
3461 destroy_comp_wq:
3462         destroy_workqueue(isert_comp_wq);
3463
3464         return ret;
3465 }
3466
3467 static void __exit isert_exit(void)
3468 {
3469         flush_scheduled_work();
3470         destroy_workqueue(isert_release_wq);
3471         destroy_workqueue(isert_comp_wq);
3472         iscsit_unregister_transport(&iser_target_transport);
3473         isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3474 }
3475
3476 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3477 MODULE_VERSION("1.0");
3478 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3479 MODULE_LICENSE("GPL");
3480
3481 module_init(isert_init);
3482 module_exit(isert_exit);