drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static int
  56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  57
  58 static void
  59 isert_qp_event_callback(struct ib_event *e, void *context)
  60 {
  61         struct isert_conn *isert_conn = (struct isert_conn *)context;
  62
  63         pr_err("isert_qp_event_callback event: %d\n", e->event);
  64         switch (e->event) {
  65         case IB_EVENT_COMM_EST:
  66                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  67                 break;
  68         case IB_EVENT_QP_LAST_WQE_REACHED:
  69                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 static int
  77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  78 {
  79         int ret;
  80
  81         ret = ib_query_device(ib_dev, devattr);
  82         if (ret) {
  83                 pr_err("ib_query_device() failed: %d\n", ret);
  84                 return ret;
  85         }
  86         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  87         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  88
  89         return 0;
  90 }
  91
  92 static int
  93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  94                     u8 protection)
  95 {
  96         struct isert_device *device = isert_conn->conn_device;
  97         struct ib_qp_init_attr attr;
  98         int ret, index, min_index = 0;
  99
 100         mutex_lock(&device_list_mutex);
 101         for (index = 0; index < device->cqs_used; index++)
 102                 if (device->cq_active_qps[index] <
 103                     device->cq_active_qps[min_index])
 104                         min_index = index;
 105         device->cq_active_qps[min_index]++;
 106         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 107         mutex_unlock(&device_list_mutex);
 108
 109         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 110         attr.event_handler = isert_qp_event_callback;
 111         attr.qp_context = isert_conn;
 112         attr.send_cq = device->dev_tx_cq[min_index];
 113         attr.recv_cq = device->dev_rx_cq[min_index];
 114         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 115         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 116         /*
 117          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 118          * work-around for RDMA_READs with ConnectX-2.
 119          *
 120          * Also, still make sure to have at least two SGEs for
 121          * outgoing control PDU responses.
 122          */
 123         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 124         isert_conn->max_sge = attr.cap.max_send_sge;
 125
 126         attr.cap.max_recv_sge = 1;
 127         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 128         attr.qp_type = IB_QPT_RC;
 129         if (protection)
 130                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 131
 132         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 133                  cma_id->device);
 134         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 135                  isert_conn->conn_pd->device);
 136
 137         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 138         if (ret) {
 139                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 140                 return ret;
 141         }
 142         isert_conn->conn_qp = cma_id->qp;
 143         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 144
 145         return 0;
 146 }
 147
 148 static void
 149 isert_cq_event_callback(struct ib_event *e, void *context)
 150 {
 151         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 152 }
 153
 154 static int
 155 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 156 {
 157         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 158         struct iser_rx_desc *rx_desc;
 159         struct ib_sge *rx_sg;
 160         u64 dma_addr;
 161         int i, j;
 162
 163         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 164                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 165         if (!isert_conn->conn_rx_descs)
 166                 goto fail;
 167
 168         rx_desc = isert_conn->conn_rx_descs;
 169
 170         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 171                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 172                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 173                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 174                         goto dma_map_fail;
 175
 176                 rx_desc->dma_addr = dma_addr;
 177
 178                 rx_sg = &rx_desc->rx_sg;
 179                 rx_sg->addr = rx_desc->dma_addr;
 180                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 181                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 182         }
 183
 184         isert_conn->conn_rx_desc_head = 0;
 185         return 0;
 186
 187 dma_map_fail:
 188         rx_desc = isert_conn->conn_rx_descs;
 189         for (j = 0; j < i; j++, rx_desc++) {
 190                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 191                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 192         }
 193         kfree(isert_conn->conn_rx_descs);
 194         isert_conn->conn_rx_descs = NULL;
 195 fail:
 196         return -ENOMEM;
 197 }
 198
 199 static void
 200 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 201 {
 202         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 203         struct iser_rx_desc *rx_desc;
 204         int i;
 205
 206         if (!isert_conn->conn_rx_descs)
 207                 return;
 208
 209         rx_desc = isert_conn->conn_rx_descs;
 210         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 211                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 212                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 213         }
 214
 215         kfree(isert_conn->conn_rx_descs);
 216         isert_conn->conn_rx_descs = NULL;
 217 }
 218
 219 static void isert_cq_tx_work(struct work_struct *);
 220 static void isert_cq_tx_callback(struct ib_cq *, void *);
 221 static void isert_cq_rx_work(struct work_struct *);
 222 static void isert_cq_rx_callback(struct ib_cq *, void *);
 223
 224 static int
 225 isert_create_device_ib_res(struct isert_device *device)
 226 {
 227         struct ib_device *ib_dev = device->ib_device;
 228         struct isert_cq_desc *cq_desc;
 229         struct ib_device_attr *dev_attr;
 230         int ret = 0, i, j;
 231         int max_rx_cqe, max_tx_cqe;
 232
 233         dev_attr = &device->dev_attr;
 234         ret = isert_query_device(ib_dev, dev_attr);
 235         if (ret)
 236                 return ret;
 237
 238         max_rx_cqe = min(ISER_MAX_RX_CQ_LEN, dev_attr->max_cqe);
 239         max_tx_cqe = min(ISER_MAX_TX_CQ_LEN, dev_attr->max_cqe);
 240
 241         /* asign function handlers */
 242         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 243             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 244                 device->use_fastreg = 1;
 245                 device->reg_rdma_mem = isert_reg_rdma;
 246                 device->unreg_rdma_mem = isert_unreg_rdma;
 247         } else {
 248                 device->use_fastreg = 0;
 249                 device->reg_rdma_mem = isert_map_rdma;
 250                 device->unreg_rdma_mem = isert_unmap_cmd;
 251         }
 252
 253         /* Check signature cap */
 254         device->pi_capable = dev_attr->device_cap_flags &
 255                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 256
 257         device->cqs_used = min_t(int, num_online_cpus(),
 258                                  device->ib_device->num_comp_vectors);
 259         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 260         pr_debug("Using %d CQs, device %s supports %d vectors support "
 261                  "Fast registration %d pi_capable %d\n",
 262                  device->cqs_used, device->ib_device->name,
 263                  device->ib_device->num_comp_vectors, device->use_fastreg,
 264                  device->pi_capable);
 265         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 266                                 device->cqs_used, GFP_KERNEL);
 267         if (!device->cq_desc) {
 268                 pr_err("Unable to allocate device->cq_desc\n");
 269                 return -ENOMEM;
 270         }
 271         cq_desc = device->cq_desc;
 272
 273         for (i = 0; i < device->cqs_used; i++) {
 274                 cq_desc[i].device = device;
 275                 cq_desc[i].cq_index = i;
 276
 277                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 278                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 279                                                 isert_cq_rx_callback,
 280                                                 isert_cq_event_callback,
 281                                                 (void *)&cq_desc[i],
 282                                                 max_rx_cqe, i);
 283                 if (IS_ERR(device->dev_rx_cq[i])) {
 284                         ret = PTR_ERR(device->dev_rx_cq[i]);
 285                         device->dev_rx_cq[i] = NULL;
 286                         goto out_cq;
 287                 }
 288
 289                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 290                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 291                                                 isert_cq_tx_callback,
 292                                                 isert_cq_event_callback,
 293                                                 (void *)&cq_desc[i],
 294                                                 max_tx_cqe, i);
 295                 if (IS_ERR(device->dev_tx_cq[i])) {
 296                         ret = PTR_ERR(device->dev_tx_cq[i]);
 297                         device->dev_tx_cq[i] = NULL;
 298                         goto out_cq;
 299                 }
 300
 301                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 302                 if (ret)
 303                         goto out_cq;
 304
 305                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 306                 if (ret)
 307                         goto out_cq;
 308         }
 309
 310         return 0;
 311
 312 out_cq:
 313         for (j = 0; j < i; j++) {
 314                 cq_desc = &device->cq_desc[j];
 315
 316                 if (device->dev_rx_cq[j]) {
 317                         cancel_work_sync(&cq_desc->cq_rx_work);
 318                         ib_destroy_cq(device->dev_rx_cq[j]);
 319                 }
 320                 if (device->dev_tx_cq[j]) {
 321                         cancel_work_sync(&cq_desc->cq_tx_work);
 322                         ib_destroy_cq(device->dev_tx_cq[j]);
 323                 }
 324         }
 325         kfree(device->cq_desc);
 326
 327         return ret;
 328 }
 329
 330 static void
 331 isert_free_device_ib_res(struct isert_device *device)
 332 {
 333         struct isert_cq_desc *cq_desc;
 334         int i;
 335
 336         for (i = 0; i < device->cqs_used; i++) {
 337                 cq_desc = &device->cq_desc[i];
 338
 339                 cancel_work_sync(&cq_desc->cq_rx_work);
 340                 cancel_work_sync(&cq_desc->cq_tx_work);
 341                 ib_destroy_cq(device->dev_rx_cq[i]);
 342                 ib_destroy_cq(device->dev_tx_cq[i]);
 343                 device->dev_rx_cq[i] = NULL;
 344                 device->dev_tx_cq[i] = NULL;
 345         }
 346
 347         kfree(device->cq_desc);
 348 }
 349
 350 static void
 351 isert_device_try_release(struct isert_device *device)
 352 {
 353         mutex_lock(&device_list_mutex);
 354         device->refcount--;
 355         if (!device->refcount) {
 356                 isert_free_device_ib_res(device);
 357                 list_del(&device->dev_node);
 358                 kfree(device);
 359         }
 360         mutex_unlock(&device_list_mutex);
 361 }
 362
 363 static struct isert_device *
 364 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 365 {
 366         struct isert_device *device;
 367         int ret;
 368
 369         mutex_lock(&device_list_mutex);
 370         list_for_each_entry(device, &device_list, dev_node) {
 371                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 372                         device->refcount++;
 373                         mutex_unlock(&device_list_mutex);
 374                         return device;
 375                 }
 376         }
 377
 378         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 379         if (!device) {
 380                 mutex_unlock(&device_list_mutex);
 381                 return ERR_PTR(-ENOMEM);
 382         }
 383
 384         INIT_LIST_HEAD(&device->dev_node);
 385
 386         device->ib_device = cma_id->device;
 387         ret = isert_create_device_ib_res(device);
 388         if (ret) {
 389                 kfree(device);
 390                 mutex_unlock(&device_list_mutex);
 391                 return ERR_PTR(ret);
 392         }
 393
 394         device->refcount++;
 395         list_add_tail(&device->dev_node, &device_list);
 396         mutex_unlock(&device_list_mutex);
 397
 398         return device;
 399 }
 400
 401 static void
 402 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 403 {
 404         struct fast_reg_descriptor *fr_desc, *tmp;
 405         int i = 0;
 406
 407         if (list_empty(&isert_conn->conn_fr_pool))
 408                 return;
 409
 410         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 411
 412         list_for_each_entry_safe(fr_desc, tmp,
 413                                  &isert_conn->conn_fr_pool, list) {
 414                 list_del(&fr_desc->list);
 415                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 416                 ib_dereg_mr(fr_desc->data_mr);
 417                 if (fr_desc->pi_ctx) {
 418                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 419                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 420                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 421                         kfree(fr_desc->pi_ctx);
 422                 }
 423                 kfree(fr_desc);
 424                 ++i;
 425         }
 426
 427         if (i < isert_conn->conn_fr_pool_size)
 428                 pr_warn("Pool still has %d regions registered\n",
 429                         isert_conn->conn_fr_pool_size - i);
 430 }
 431
 432 static int
 433 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 434                      struct fast_reg_descriptor *fr_desc, u8 protection)
 435 {
 436         int ret;
 437
 438         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 439                                                          ISCSI_ISER_SG_TABLESIZE);
 440         if (IS_ERR(fr_desc->data_frpl)) {
 441                 pr_err("Failed to allocate data frpl err=%ld\n",
 442                        PTR_ERR(fr_desc->data_frpl));
 443                 return PTR_ERR(fr_desc->data_frpl);
 444         }
 445
 446         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 447         if (IS_ERR(fr_desc->data_mr)) {
 448                 pr_err("Failed to allocate data frmr err=%ld\n",
 449                        PTR_ERR(fr_desc->data_mr));
 450                 ret = PTR_ERR(fr_desc->data_mr);
 451                 goto err_data_frpl;
 452         }
 453         pr_debug("Create fr_desc %p page_list %p\n",
 454                  fr_desc, fr_desc->data_frpl->page_list);
 455         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 456
 457         if (protection) {
 458                 struct ib_mr_init_attr mr_init_attr = {0};
 459                 struct pi_context *pi_ctx;
 460
 461                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 462                 if (!fr_desc->pi_ctx) {
 463                         pr_err("Failed to allocate pi context\n");
 464                         ret = -ENOMEM;
 465                         goto err_data_mr;
 466                 }
 467                 pi_ctx = fr_desc->pi_ctx;
 468
 469                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 470                                                     ISCSI_ISER_SG_TABLESIZE);
 471                 if (IS_ERR(pi_ctx->prot_frpl)) {
 472                         pr_err("Failed to allocate prot frpl err=%ld\n",
 473                                PTR_ERR(pi_ctx->prot_frpl));
 474                         ret = PTR_ERR(pi_ctx->prot_frpl);
 475                         goto err_pi_ctx;
 476                 }
 477
 478                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 479                 if (IS_ERR(pi_ctx->prot_mr)) {
 480                         pr_err("Failed to allocate prot frmr err=%ld\n",
 481                                PTR_ERR(pi_ctx->prot_mr));
 482                         ret = PTR_ERR(pi_ctx->prot_mr);
 483                         goto err_prot_frpl;
 484                 }
 485                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 486
 487                 mr_init_attr.max_reg_descriptors = 2;
 488                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 489                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 490                 if (IS_ERR(pi_ctx->sig_mr)) {
 491                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 492                                PTR_ERR(pi_ctx->sig_mr));
 493                         ret = PTR_ERR(pi_ctx->sig_mr);
 494                         goto err_prot_mr;
 495                 }
 496                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 497         }
 498         fr_desc->ind &= ~ISERT_PROTECTED;
 499
 500         return 0;
 501 err_prot_mr:
 502         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 503 err_prot_frpl:
 504         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 505 err_pi_ctx:
 506         kfree(fr_desc->pi_ctx);
 507 err_data_mr:
 508         ib_dereg_mr(fr_desc->data_mr);
 509 err_data_frpl:
 510         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 511
 512         return ret;
 513 }
 514
 515 static int
 516 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 517 {
 518         struct fast_reg_descriptor *fr_desc;
 519         struct isert_device *device = isert_conn->conn_device;
 520         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 521         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 522         int i, ret, tag_num;
 523         /*
 524          * Setup the number of FRMRs based upon the number of tags
 525          * available to session in iscsi_target_locate_portal().
 526          */
 527         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 528         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 529
 530         isert_conn->conn_fr_pool_size = 0;
 531         for (i = 0; i < tag_num; i++) {
 532                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 533                 if (!fr_desc) {
 534                         pr_err("Failed to allocate fast_reg descriptor\n");
 535                         ret = -ENOMEM;
 536                         goto err;
 537                 }
 538
 539                 ret = isert_create_fr_desc(device->ib_device,
 540                                            isert_conn->conn_pd, fr_desc,
 541                                            pi_support);
 542                 if (ret) {
 543                         pr_err("Failed to create fastreg descriptor err=%d\n",
 544                                ret);
 545                         kfree(fr_desc);
 546                         goto err;
 547                 }
 548
 549                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 550                 isert_conn->conn_fr_pool_size++;
 551         }
 552
 553         pr_debug("Creating conn %p fastreg pool size=%d",
 554                  isert_conn, isert_conn->conn_fr_pool_size);
 555
 556         return 0;
 557
 558 err:
 559         isert_conn_free_fastreg_pool(isert_conn);
 560         return ret;
 561 }
 562
 563 static int
 564 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 565 {
 566         struct iscsi_np *np = cma_id->context;
 567         struct isert_np *isert_np = np->np_context;
 568         struct isert_conn *isert_conn;
 569         struct isert_device *device;
 570         struct ib_device *ib_dev = cma_id->device;
 571         int ret = 0;
 572         u8 pi_support;
 573
 574         spin_lock_bh(&np->np_thread_lock);
 575         if (!np->enabled) {
 576                 spin_unlock_bh(&np->np_thread_lock);
 577                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 578                 return rdma_reject(cma_id, NULL, 0);
 579         }
 580         spin_unlock_bh(&np->np_thread_lock);
 581
 582         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 583                  cma_id, cma_id->context);
 584
 585         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 586         if (!isert_conn) {
 587                 pr_err("Unable to allocate isert_conn\n");
 588                 return -ENOMEM;
 589         }
 590         isert_conn->state = ISER_CONN_INIT;
 591         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 592         init_completion(&isert_conn->conn_login_comp);
 593         init_completion(&isert_conn->conn_wait);
 594         init_completion(&isert_conn->conn_wait_comp_err);
 595         kref_init(&isert_conn->conn_kref);
 596         mutex_init(&isert_conn->conn_mutex);
 597         spin_lock_init(&isert_conn->conn_lock);
 598         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 599
 600         cma_id->context = isert_conn;
 601         isert_conn->conn_cm_id = cma_id;
 602
 603         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 604                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 605         if (!isert_conn->login_buf) {
 606                 pr_err("Unable to allocate isert_conn->login_buf\n");
 607                 ret = -ENOMEM;
 608                 goto out;
 609         }
 610
 611         isert_conn->login_req_buf = isert_conn->login_buf;
 612         isert_conn->login_rsp_buf = isert_conn->login_buf +
 613                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 614         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 615                  isert_conn->login_buf, isert_conn->login_req_buf,
 616                  isert_conn->login_rsp_buf);
 617
 618         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 619                                 (void *)isert_conn->login_req_buf,
 620                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 621
 622         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 623         if (ret) {
 624                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 625                        ret);
 626                 isert_conn->login_req_dma = 0;
 627                 goto out_login_buf;
 628         }
 629
 630         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 631                                         (void *)isert_conn->login_rsp_buf,
 632                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 633
 634         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 635         if (ret) {
 636                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 637                        ret);
 638                 isert_conn->login_rsp_dma = 0;
 639                 goto out_req_dma_map;
 640         }
 641
 642         device = isert_device_find_by_ib_dev(cma_id);
 643         if (IS_ERR(device)) {
 644                 ret = PTR_ERR(device);
 645                 goto out_rsp_dma_map;
 646         }
 647
 648         /* Set max inflight RDMA READ requests */
 649         isert_conn->initiator_depth = min_t(u8,
 650                                 event->param.conn.initiator_depth,
 651                                 device->dev_attr.max_qp_init_rd_atom);
 652         pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 653
 654         isert_conn->conn_device = device;
 655         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 656         if (IS_ERR(isert_conn->conn_pd)) {
 657                 ret = PTR_ERR(isert_conn->conn_pd);
 658                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 659                        isert_conn, ret);
 660                 goto out_pd;
 661         }
 662
 663         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 664                                            IB_ACCESS_LOCAL_WRITE);
 665         if (IS_ERR(isert_conn->conn_mr)) {
 666                 ret = PTR_ERR(isert_conn->conn_mr);
 667                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 668                        isert_conn, ret);
 669                 goto out_mr;
 670         }
 671
 672         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 673         if (pi_support && !device->pi_capable) {
 674                 pr_err("Protection information requested but not supported, "
 675                        "rejecting connect request\n");
 676                 ret = rdma_reject(cma_id, NULL, 0);
 677                 goto out_mr;
 678         }
 679
 680         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 681         if (ret)
 682                 goto out_conn_dev;
 683
 684         mutex_lock(&isert_np->np_accept_mutex);
 685         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 686         mutex_unlock(&isert_np->np_accept_mutex);
 687
 688         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 689         up(&isert_np->np_sem);
 690         return 0;
 691
 692 out_conn_dev:
 693         ib_dereg_mr(isert_conn->conn_mr);
 694 out_mr:
 695         ib_dealloc_pd(isert_conn->conn_pd);
 696 out_pd:
 697         isert_device_try_release(device);
 698 out_rsp_dma_map:
 699         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 700                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 701 out_req_dma_map:
 702         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 703                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 704 out_login_buf:
 705         kfree(isert_conn->login_buf);
 706 out:
 707         kfree(isert_conn);
 708         return ret;
 709 }
 710
 711 static void
 712 isert_connect_release(struct isert_conn *isert_conn)
 713 {
 714         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 715         struct isert_device *device = isert_conn->conn_device;
 716         int cq_index;
 717
 718         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 719
 720         if (device && device->use_fastreg)
 721                 isert_conn_free_fastreg_pool(isert_conn);
 722
 723         if (isert_conn->conn_qp) {
 724                 cq_index = ((struct isert_cq_desc *)
 725                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 726                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 727                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 728
 729                 rdma_destroy_qp(isert_conn->conn_cm_id);
 730         }
 731
 732         isert_free_rx_descriptors(isert_conn);
 733         rdma_destroy_id(isert_conn->conn_cm_id);
 734
 735         ib_dereg_mr(isert_conn->conn_mr);
 736         ib_dealloc_pd(isert_conn->conn_pd);
 737
 738         if (isert_conn->login_buf) {
 739                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 740                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 741                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 742                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 743                                     DMA_FROM_DEVICE);
 744                 kfree(isert_conn->login_buf);
 745         }
 746         kfree(isert_conn);
 747
 748         if (device)
 749                 isert_device_try_release(device);
 750
 751         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 752 }
 753
 754 static void
 755 isert_connected_handler(struct rdma_cm_id *cma_id)
 756 {
 757         struct isert_conn *isert_conn = cma_id->context;
 758
 759         kref_get(&isert_conn->conn_kref);
 760 }
 761
 762 static void
 763 isert_release_conn_kref(struct kref *kref)
 764 {
 765         struct isert_conn *isert_conn = container_of(kref,
 766                                 struct isert_conn, conn_kref);
 767
 768         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 769                  current->comm, current->pid);
 770
 771         isert_connect_release(isert_conn);
 772 }
 773
 774 static void
 775 isert_put_conn(struct isert_conn *isert_conn)
 776 {
 777         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 778 }
 779
 780 /**
 781  * isert_conn_terminate() - Initiate connection termination
 782  * @isert_conn: isert connection struct
 783  *
 784  * Notes:
 785  * In case the connection state is UP, move state
 786  * to TEMINATING and start teardown sequence (rdma_disconnect).
 787  *
 788  * This routine must be called with conn_mutex held. Thus it is
 789  * safe to call multiple times.
 790  */
 791 static void
 792 isert_conn_terminate(struct isert_conn *isert_conn)
 793 {
 794         int err;
 795
 796         if (isert_conn->state == ISER_CONN_UP) {
 797                 isert_conn->state = ISER_CONN_TERMINATING;
 798                 pr_info("Terminating conn %p state %d\n",
 799                            isert_conn, isert_conn->state);
 800                 err = rdma_disconnect(isert_conn->conn_cm_id);
 801                 if (err)
 802                         pr_warn("Failed rdma_disconnect isert_conn %p\n",
 803                                    isert_conn);
 804         }
 805 }
 806
 807 static void
 808 isert_disconnect_work(struct work_struct *work)
 809 {
 810         struct isert_conn *isert_conn = container_of(work,
 811                                 struct isert_conn, conn_logout_work);
 812
 813         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 814         mutex_lock(&isert_conn->conn_mutex);
 815         isert_conn_terminate(isert_conn);
 816         mutex_unlock(&isert_conn->conn_mutex);
 817
 818         pr_info("conn %p completing conn_wait\n", isert_conn);
 819         complete(&isert_conn->conn_wait);
 820 }
 821
 822 static int
 823 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 824 {
 825         struct isert_conn *isert_conn;
 826
 827         if (!cma_id->qp) {
 828                 struct isert_np *isert_np = cma_id->context;
 829
 830                 isert_np->np_cm_id = NULL;
 831                 return -1;
 832         }
 833
 834         isert_conn = (struct isert_conn *)cma_id->context;
 835
 836         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 837         schedule_work(&isert_conn->conn_logout_work);
 838
 839         return 0;
 840 }
 841
 842 static void
 843 isert_connect_error(struct rdma_cm_id *cma_id)
 844 {
 845         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 846
 847         isert_put_conn(isert_conn);
 848 }
 849
 850 static int
 851 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 852 {
 853         int ret = 0;
 854
 855         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 856                  event->event, event->status, cma_id->context, cma_id);
 857
 858         switch (event->event) {
 859         case RDMA_CM_EVENT_CONNECT_REQUEST:
 860                 ret = isert_connect_request(cma_id, event);
 861                 if (ret)
 862                         pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 863                                 event->event, ret);
 864                 break;
 865         case RDMA_CM_EVENT_ESTABLISHED:
 866                 isert_connected_handler(cma_id);
 867                 break;
 868         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 869         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 870         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 871         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 872                 ret = isert_disconnected_handler(cma_id);
 873                 break;
 874         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 875         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 876         case RDMA_CM_EVENT_CONNECT_ERROR:
 877                 isert_connect_error(cma_id);
 878                 break;
 879         default:
 880                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 881                 break;
 882         }
 883
 884         return ret;
 885 }
 886
 887 static int
 888 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 889 {
 890         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 891         int i, ret;
 892         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 893         struct iser_rx_desc *rx_desc;
 894
 895         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 896                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 897                 rx_wr->wr_id    = (unsigned long)rx_desc;
 898                 rx_wr->sg_list  = &rx_desc->rx_sg;
 899                 rx_wr->num_sge  = 1;
 900                 rx_wr->next     = rx_wr + 1;
 901                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 902         }
 903
 904         rx_wr--;
 905         rx_wr->next = NULL; /* mark end of work requests list */
 906
 907         isert_conn->post_recv_buf_count += count;
 908         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 909                                 &rx_wr_failed);
 910         if (ret) {
 911                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 912                 isert_conn->post_recv_buf_count -= count;
 913         } else {
 914                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 915                 isert_conn->conn_rx_desc_head = rx_head;
 916         }
 917         return ret;
 918 }
 919
 920 static int
 921 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 922 {
 923         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 924         struct ib_send_wr send_wr, *send_wr_failed;
 925         int ret;
 926
 927         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 928                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 929
 930         send_wr.next    = NULL;
 931         send_wr.wr_id   = (unsigned long)tx_desc;
 932         send_wr.sg_list = tx_desc->tx_sg;
 933         send_wr.num_sge = tx_desc->num_sge;
 934         send_wr.opcode  = IB_WR_SEND;
 935         send_wr.send_flags = IB_SEND_SIGNALED;
 936
 937         atomic_inc(&isert_conn->post_send_buf_count);
 938
 939         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 940         if (ret) {
 941                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 942                 atomic_dec(&isert_conn->post_send_buf_count);
 943         }
 944
 945         return ret;
 946 }
 947
 948 static void
 949 isert_create_send_desc(struct isert_conn *isert_conn,
 950                        struct isert_cmd *isert_cmd,
 951                        struct iser_tx_desc *tx_desc)
 952 {
 953         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 954
 955         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 956                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 957
 958         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 959         tx_desc->iser_header.flags = ISER_VER;
 960
 961         tx_desc->num_sge = 1;
 962         tx_desc->isert_cmd = isert_cmd;
 963
 964         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 965                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 966                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 967         }
 968 }
 969
 970 static int
 971 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 972                    struct iser_tx_desc *tx_desc)
 973 {
 974         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 975         u64 dma_addr;
 976
 977         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 978                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 979         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 980                 pr_err("ib_dma_mapping_error() failed\n");
 981                 return -ENOMEM;
 982         }
 983
 984         tx_desc->dma_addr = dma_addr;
 985         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 986         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 987         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 988
 989         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 990                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 991                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 992
 993         return 0;
 994 }
 995
 996 static void
 997 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 998                    struct ib_send_wr *send_wr, bool coalesce)
 999 {
1000         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1001
1002         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1003         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
1004         send_wr->opcode = IB_WR_SEND;
1005         send_wr->sg_list = &tx_desc->tx_sg[0];
1006         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1007         /*
1008          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
1009          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
1010          */
1011         mutex_lock(&isert_conn->conn_mutex);
1012         if (coalesce && isert_conn->state == ISER_CONN_UP &&
1013             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
1014                 tx_desc->llnode_active = true;
1015                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
1016                 mutex_unlock(&isert_conn->conn_mutex);
1017                 return;
1018         }
1019         isert_conn->conn_comp_batch = 0;
1020         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
1021         mutex_unlock(&isert_conn->conn_mutex);
1022
1023         send_wr->send_flags = IB_SEND_SIGNALED;
1024 }
1025
1026 static int
1027 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1028 {
1029         struct ib_recv_wr rx_wr, *rx_wr_fail;
1030         struct ib_sge sge;
1031         int ret;
1032
1033         memset(&sge, 0, sizeof(struct ib_sge));
1034         sge.addr = isert_conn->login_req_dma;
1035         sge.length = ISER_RX_LOGIN_SIZE;
1036         sge.lkey = isert_conn->conn_mr->lkey;
1037
1038         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1039                 sge.addr, sge.length, sge.lkey);
1040
1041         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1042         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1043         rx_wr.sg_list = &sge;
1044         rx_wr.num_sge = 1;
1045
1046         isert_conn->post_recv_buf_count++;
1047         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1048         if (ret) {
1049                 pr_err("ib_post_recv() failed: %d\n", ret);
1050                 isert_conn->post_recv_buf_count--;
1051         }
1052
1053         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1054         return ret;
1055 }
1056
1057 static int
1058 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1059                    u32 length)
1060 {
1061         struct isert_conn *isert_conn = conn->context;
1062         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1063         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1064         int ret;
1065
1066         isert_create_send_desc(isert_conn, NULL, tx_desc);
1067
1068         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1069                sizeof(struct iscsi_hdr));
1070
1071         isert_init_tx_hdrs(isert_conn, tx_desc);
1072
1073         if (length > 0) {
1074                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1075
1076                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1077                                            length, DMA_TO_DEVICE);
1078
1079                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1080
1081                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1082                                               length, DMA_TO_DEVICE);
1083
1084                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1085                 tx_dsg->length  = length;
1086                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1087                 tx_desc->num_sge = 2;
1088         }
1089         if (!login->login_failed) {
1090                 if (login->login_complete) {
1091                         if (!conn->sess->sess_ops->SessionType &&
1092                             isert_conn->conn_device->use_fastreg) {
1093                                 /* Normal Session and fastreg is used */
1094                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1095
1096                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1097                                                                      pi_support);
1098                                 if (ret) {
1099                                         pr_err("Conn: %p failed to create"
1100                                                " fastreg pool\n", isert_conn);
1101                                         return ret;
1102                                 }
1103                         }
1104
1105                         ret = isert_alloc_rx_descriptors(isert_conn);
1106                         if (ret)
1107                                 return ret;
1108
1109                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1110                         if (ret)
1111                                 return ret;
1112
1113                         isert_conn->state = ISER_CONN_UP;
1114                         goto post_send;
1115                 }
1116
1117                 ret = isert_rdma_post_recvl(isert_conn);
1118                 if (ret)
1119                         return ret;
1120         }
1121 post_send:
1122         ret = isert_post_send(isert_conn, tx_desc);
1123         if (ret)
1124                 return ret;
1125
1126         return 0;
1127 }
1128
1129 static void
1130 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1131                    struct isert_conn *isert_conn)
1132 {
1133         struct iscsi_conn *conn = isert_conn->conn;
1134         struct iscsi_login *login = conn->conn_login;
1135         int size;
1136
1137         if (!login) {
1138                 pr_err("conn->conn_login is NULL\n");
1139                 dump_stack();
1140                 return;
1141         }
1142
1143         if (login->first_request) {
1144                 struct iscsi_login_req *login_req =
1145                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1146                 /*
1147                  * Setup the initial iscsi_login values from the leading
1148                  * login request PDU.
1149                  */
1150                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1151                 login->current_stage =
1152                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1153                          >> 2;
1154                 login->version_min      = login_req->min_version;
1155                 login->version_max      = login_req->max_version;
1156                 memcpy(login->isid, login_req->isid, 6);
1157                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1158                 login->init_task_tag    = login_req->itt;
1159                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1160                 login->cid              = be16_to_cpu(login_req->cid);
1161                 login->tsih             = be16_to_cpu(login_req->tsih);
1162         }
1163
1164         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1165
1166         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1167         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1168                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1169         memcpy(login->req_buf, &rx_desc->data[0], size);
1170
1171         if (login->first_request) {
1172                 complete(&isert_conn->conn_login_comp);
1173                 return;
1174         }
1175         schedule_delayed_work(&conn->login_work, 0);
1176 }
1177
1178 static struct iscsi_cmd
1179 *isert_allocate_cmd(struct iscsi_conn *conn)
1180 {
1181         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1182         struct isert_cmd *isert_cmd;
1183         struct iscsi_cmd *cmd;
1184
1185         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1186         if (!cmd) {
1187                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1188                 return NULL;
1189         }
1190         isert_cmd = iscsit_priv_cmd(cmd);
1191         isert_cmd->conn = isert_conn;
1192         isert_cmd->iscsi_cmd = cmd;
1193
1194         return cmd;
1195 }
1196
1197 static int
1198 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1199                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1200                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1201 {
1202         struct iscsi_conn *conn = isert_conn->conn;
1203         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1204         struct scatterlist *sg;
1205         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1206         bool dump_payload = false;
1207
1208         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1209         if (rc < 0)
1210                 return rc;
1211
1212         imm_data = cmd->immediate_data;
1213         imm_data_len = cmd->first_burst_len;
1214         unsol_data = cmd->unsolicited_data;
1215
1216         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1217         if (rc < 0) {
1218                 return 0;
1219         } else if (rc > 0) {
1220                 dump_payload = true;
1221                 goto sequence_cmd;
1222         }
1223
1224         if (!imm_data)
1225                 return 0;
1226
1227         sg = &cmd->se_cmd.t_data_sg[0];
1228         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1229
1230         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1231                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1232
1233         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1234
1235         cmd->write_data_done += imm_data_len;
1236
1237         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1238                 spin_lock_bh(&cmd->istate_lock);
1239                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1240                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1241                 spin_unlock_bh(&cmd->istate_lock);
1242         }
1243
1244 sequence_cmd:
1245         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1246
1247         if (!rc && dump_payload == false && unsol_data)
1248                 iscsit_set_unsoliticed_dataout(cmd);
1249         else if (dump_payload && imm_data)
1250                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1251
1252         return 0;
1253 }
1254
1255 static int
1256 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1257                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1258 {
1259         struct scatterlist *sg_start;
1260         struct iscsi_conn *conn = isert_conn->conn;
1261         struct iscsi_cmd *cmd = NULL;
1262         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1263         u32 unsol_data_len = ntoh24(hdr->dlength);
1264         int rc, sg_nents, sg_off, page_off;
1265
1266         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1267         if (rc < 0)
1268                 return rc;
1269         else if (!cmd)
1270                 return 0;
1271         /*
1272          * FIXME: Unexpected unsolicited_data out
1273          */
1274         if (!cmd->unsolicited_data) {
1275                 pr_err("Received unexpected solicited data payload\n");
1276                 dump_stack();
1277                 return -1;
1278         }
1279
1280         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1281                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1282
1283         sg_off = cmd->write_data_done / PAGE_SIZE;
1284         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1285         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1286         page_off = cmd->write_data_done % PAGE_SIZE;
1287         /*
1288          * FIXME: Non page-aligned unsolicited_data out
1289          */
1290         if (page_off) {
1291                 pr_err("Received unexpected non-page aligned data payload\n");
1292                 dump_stack();
1293                 return -1;
1294         }
1295         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1296                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1297
1298         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1299                             unsol_data_len);
1300
1301         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1302         if (rc < 0)
1303                 return rc;
1304
1305         return 0;
1306 }
1307
1308 static int
1309 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1310                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1311                      unsigned char *buf)
1312 {
1313         struct iscsi_conn *conn = isert_conn->conn;
1314         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1315         int rc;
1316
1317         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1318         if (rc < 0)
1319                 return rc;
1320         /*
1321          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1322          */
1323
1324         return iscsit_process_nop_out(conn, cmd, hdr);
1325 }
1326
1327 static int
1328 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1329                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1330                       struct iscsi_text *hdr)
1331 {
1332         struct iscsi_conn *conn = isert_conn->conn;
1333         u32 payload_length = ntoh24(hdr->dlength);
1334         int rc;
1335         unsigned char *text_in;
1336
1337         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1338         if (rc < 0)
1339                 return rc;
1340
1341         text_in = kzalloc(payload_length, GFP_KERNEL);
1342         if (!text_in) {
1343                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1344                        payload_length);
1345                 return -ENOMEM;
1346         }
1347         cmd->text_in_ptr = text_in;
1348
1349         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1350
1351         return iscsit_process_text_cmd(conn, cmd, hdr);
1352 }
1353
1354 static int
1355 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1356                 uint32_t read_stag, uint64_t read_va,
1357                 uint32_t write_stag, uint64_t write_va)
1358 {
1359         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1360         struct iscsi_conn *conn = isert_conn->conn;
1361         struct iscsi_session *sess = conn->sess;
1362         struct iscsi_cmd *cmd;
1363         struct isert_cmd *isert_cmd;
1364         int ret = -EINVAL;
1365         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1366
1367         if (sess->sess_ops->SessionType &&
1368            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1369                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1370                        " ignoring\n", opcode);
1371                 return 0;
1372         }
1373
1374         switch (opcode) {
1375         case ISCSI_OP_SCSI_CMD:
1376                 cmd = isert_allocate_cmd(conn);
1377                 if (!cmd)
1378                         break;
1379
1380                 isert_cmd = iscsit_priv_cmd(cmd);
1381                 isert_cmd->read_stag = read_stag;
1382                 isert_cmd->read_va = read_va;
1383                 isert_cmd->write_stag = write_stag;
1384                 isert_cmd->write_va = write_va;
1385
1386                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1387                                         rx_desc, (unsigned char *)hdr);
1388                 break;
1389         case ISCSI_OP_NOOP_OUT:
1390                 cmd = isert_allocate_cmd(conn);
1391                 if (!cmd)
1392                         break;
1393
1394                 isert_cmd = iscsit_priv_cmd(cmd);
1395                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1396                                            rx_desc, (unsigned char *)hdr);
1397                 break;
1398         case ISCSI_OP_SCSI_DATA_OUT:
1399                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1400                                                 (unsigned char *)hdr);
1401                 break;
1402         case ISCSI_OP_SCSI_TMFUNC:
1403                 cmd = isert_allocate_cmd(conn);
1404                 if (!cmd)
1405                         break;
1406
1407                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1408                                                 (unsigned char *)hdr);
1409                 break;
1410         case ISCSI_OP_LOGOUT:
1411                 cmd = isert_allocate_cmd(conn);
1412                 if (!cmd)
1413                         break;
1414
1415                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1416                 if (ret > 0)
1417                         wait_for_completion_timeout(&conn->conn_logout_comp,
1418                                                     SECONDS_FOR_LOGOUT_COMP *
1419                                                     HZ);
1420                 break;
1421         case ISCSI_OP_TEXT:
1422                 cmd = isert_allocate_cmd(conn);
1423                 if (!cmd)
1424                         break;
1425
1426                 isert_cmd = iscsit_priv_cmd(cmd);
1427                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1428                                             rx_desc, (struct iscsi_text *)hdr);
1429                 break;
1430         default:
1431                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1432                 dump_stack();
1433                 break;
1434         }
1435
1436         return ret;
1437 }
1438
1439 static void
1440 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1441 {
1442         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1443         uint64_t read_va = 0, write_va = 0;
1444         uint32_t read_stag = 0, write_stag = 0;
1445         int rc;
1446
1447         switch (iser_hdr->flags & 0xF0) {
1448         case ISCSI_CTRL:
1449                 if (iser_hdr->flags & ISER_RSV) {
1450                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1451                         read_va = be64_to_cpu(iser_hdr->read_va);
1452                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1453                                  read_stag, (unsigned long long)read_va);
1454                 }
1455                 if (iser_hdr->flags & ISER_WSV) {
1456                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1457                         write_va = be64_to_cpu(iser_hdr->write_va);
1458                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1459                                  write_stag, (unsigned long long)write_va);
1460                 }
1461
1462                 pr_debug("ISER ISCSI_CTRL PDU\n");
1463                 break;
1464         case ISER_HELLO:
1465                 pr_err("iSER Hello message\n");
1466                 break;
1467         default:
1468                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1469                 break;
1470         }
1471
1472         rc = isert_rx_opcode(isert_conn, rx_desc,
1473                              read_stag, read_va, write_stag, write_va);
1474 }
1475
1476 static void
1477 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1478                     unsigned long xfer_len)
1479 {
1480         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1481         struct iscsi_hdr *hdr;
1482         u64 rx_dma;
1483         int rx_buflen, outstanding;
1484
1485         if ((char *)desc == isert_conn->login_req_buf) {
1486                 rx_dma = isert_conn->login_req_dma;
1487                 rx_buflen = ISER_RX_LOGIN_SIZE;
1488                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1489                          rx_dma, rx_buflen);
1490         } else {
1491                 rx_dma = desc->dma_addr;
1492                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1493                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1494                          rx_dma, rx_buflen);
1495         }
1496
1497         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1498
1499         hdr = &desc->iscsi_header;
1500         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1501                  hdr->opcode, hdr->itt, hdr->flags,
1502                  (int)(xfer_len - ISER_HEADERS_LEN));
1503
1504         if ((char *)desc == isert_conn->login_req_buf)
1505                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1506                                    isert_conn);
1507         else
1508                 isert_rx_do_work(desc, isert_conn);
1509
1510         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1511                                       DMA_FROM_DEVICE);
1512
1513         isert_conn->post_recv_buf_count--;
1514         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1515                  isert_conn->post_recv_buf_count);
1516
1517         if ((char *)desc == isert_conn->login_req_buf)
1518                 return;
1519
1520         outstanding = isert_conn->post_recv_buf_count;
1521         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1522                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1523                                 ISERT_MIN_POSTED_RX);
1524                 err = isert_post_recv(isert_conn, count);
1525                 if (err) {
1526                         pr_err("isert_post_recv() count: %d failed, %d\n",
1527                                count, err);
1528                 }
1529         }
1530 }
1531
1532 static int
1533 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1534                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1535                    enum iser_ib_op_code op, struct isert_data_buf *data)
1536 {
1537         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1538
1539         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1540                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1541
1542         data->len = length - offset;
1543         data->offset = offset;
1544         data->sg_off = data->offset / PAGE_SIZE;
1545
1546         data->sg = &sg[data->sg_off];
1547         data->nents = min_t(unsigned int, nents - data->sg_off,
1548                                           ISCSI_ISER_SG_TABLESIZE);
1549         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1550                                         PAGE_SIZE);
1551
1552         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1553                                         data->dma_dir);
1554         if (unlikely(!data->dma_nents)) {
1555                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1556                 return -EINVAL;
1557         }
1558
1559         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1560                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1561
1562         return 0;
1563 }
1564
1565 static void
1566 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1567 {
1568         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1569
1570         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1571         memset(data, 0, sizeof(*data));
1572 }
1573
1574
1575
1576 static void
1577 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1578 {
1579         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1580
1581         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1582
1583         if (wr->data.sg) {
1584                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1585                 isert_unmap_data_buf(isert_conn, &wr->data);
1586         }
1587
1588         if (wr->send_wr) {
1589                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1590                 kfree(wr->send_wr);
1591                 wr->send_wr = NULL;
1592         }
1593
1594         if (wr->ib_sge) {
1595                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1596                 kfree(wr->ib_sge);
1597                 wr->ib_sge = NULL;
1598         }
1599 }
1600
1601 static void
1602 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1603 {
1604         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1605         LIST_HEAD(unmap_list);
1606
1607         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1608
1609         if (wr->fr_desc) {
1610                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1611                          isert_cmd, wr->fr_desc);
1612                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1613                         isert_unmap_data_buf(isert_conn, &wr->prot);
1614                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1615                 }
1616                 spin_lock_bh(&isert_conn->conn_lock);
1617                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1618                 spin_unlock_bh(&isert_conn->conn_lock);
1619                 wr->fr_desc = NULL;
1620         }
1621
1622         if (wr->data.sg) {
1623                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1624                 isert_unmap_data_buf(isert_conn, &wr->data);
1625         }
1626
1627         wr->ib_sge = NULL;
1628         wr->send_wr = NULL;
1629 }
1630
1631 static void
1632 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1633 {
1634         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1635         struct isert_conn *isert_conn = isert_cmd->conn;
1636         struct iscsi_conn *conn = isert_conn->conn;
1637         struct isert_device *device = isert_conn->conn_device;
1638
1639         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1640
1641         switch (cmd->iscsi_opcode) {
1642         case ISCSI_OP_SCSI_CMD:
1643                 spin_lock_bh(&conn->cmd_lock);
1644                 if (!list_empty(&cmd->i_conn_node))
1645                         list_del_init(&cmd->i_conn_node);
1646                 spin_unlock_bh(&conn->cmd_lock);
1647
1648                 if (cmd->data_direction == DMA_TO_DEVICE) {
1649                         iscsit_stop_dataout_timer(cmd);
1650                         /*
1651                          * Check for special case during comp_err where
1652                          * WRITE_PENDING has been handed off from core,
1653                          * but requires an extra target_put_sess_cmd()
1654                          * before transport_generic_free_cmd() below.
1655                          */
1656                         if (comp_err &&
1657                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1658                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1659
1660                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1661                         }
1662                 }
1663
1664                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1665                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1666                 break;
1667         case ISCSI_OP_SCSI_TMFUNC:
1668                 spin_lock_bh(&conn->cmd_lock);
1669                 if (!list_empty(&cmd->i_conn_node))
1670                         list_del_init(&cmd->i_conn_node);
1671                 spin_unlock_bh(&conn->cmd_lock);
1672
1673                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1674                 break;
1675         case ISCSI_OP_REJECT:
1676         case ISCSI_OP_NOOP_OUT:
1677         case ISCSI_OP_TEXT:
1678                 spin_lock_bh(&conn->cmd_lock);
1679                 if (!list_empty(&cmd->i_conn_node))
1680                         list_del_init(&cmd->i_conn_node);
1681                 spin_unlock_bh(&conn->cmd_lock);
1682
1683                 /*
1684                  * Handle special case for REJECT when iscsi_add_reject*() has
1685                  * overwritten the original iscsi_opcode assignment, and the
1686                  * associated cmd->se_cmd needs to be released.
1687                  */
1688                 if (cmd->se_cmd.se_tfo != NULL) {
1689                         pr_debug("Calling transport_generic_free_cmd from"
1690                                  " isert_put_cmd for 0x%02x\n",
1691                                  cmd->iscsi_opcode);
1692                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1693                         break;
1694                 }
1695                 /*
1696                  * Fall-through
1697                  */
1698         default:
1699                 iscsit_release_cmd(cmd);
1700                 break;
1701         }
1702 }
1703
1704 static void
1705 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1706 {
1707         if (tx_desc->dma_addr != 0) {
1708                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1709                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1710                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1711                 tx_desc->dma_addr = 0;
1712         }
1713 }
1714
1715 static void
1716 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1717                      struct ib_device *ib_dev, bool comp_err)
1718 {
1719         if (isert_cmd->pdu_buf_dma != 0) {
1720                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1721                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1722                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1723                 isert_cmd->pdu_buf_dma = 0;
1724         }
1725
1726         isert_unmap_tx_desc(tx_desc, ib_dev);
1727         isert_put_cmd(isert_cmd, comp_err);
1728 }
1729
1730 static int
1731 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1732 {
1733         struct ib_mr_status mr_status;
1734         int ret;
1735
1736         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1737         if (ret) {
1738                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1739                 goto fail_mr_status;
1740         }
1741
1742         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1743                 u64 sec_offset_err;
1744                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1745
1746                 switch (mr_status.sig_err.err_type) {
1747                 case IB_SIG_BAD_GUARD:
1748                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1749                         break;
1750                 case IB_SIG_BAD_REFTAG:
1751                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1752                         break;
1753                 case IB_SIG_BAD_APPTAG:
1754                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1755                         break;
1756                 }
1757                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1758                 do_div(sec_offset_err, block_size);
1759                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1760
1761                 pr_err("isert: PI error found type %d at sector 0x%llx "
1762                        "expected 0x%x vs actual 0x%x\n",
1763                        mr_status.sig_err.err_type,
1764                        (unsigned long long)se_cmd->bad_sector,
1765                        mr_status.sig_err.expected,
1766                        mr_status.sig_err.actual);
1767                 ret = 1;
1768         }
1769
1770 fail_mr_status:
1771         return ret;
1772 }
1773
1774 static void
1775 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1776                             struct isert_cmd *isert_cmd)
1777 {
1778         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1779         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1780         struct se_cmd *se_cmd = &cmd->se_cmd;
1781         struct isert_conn *isert_conn = isert_cmd->conn;
1782         struct isert_device *device = isert_conn->conn_device;
1783         int ret = 0;
1784
1785         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1786                 ret = isert_check_pi_status(se_cmd,
1787                                             wr->fr_desc->pi_ctx->sig_mr);
1788                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1789         }
1790
1791         device->unreg_rdma_mem(isert_cmd, isert_conn);
1792         wr->send_wr_num = 0;
1793         if (ret)
1794                 transport_send_check_condition_and_sense(se_cmd,
1795                                                          se_cmd->pi_err, 0);
1796         else
1797                 isert_put_response(isert_conn->conn, cmd);
1798 }
1799
1800 static void
1801 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1802                            struct isert_cmd *isert_cmd)
1803 {
1804         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1805         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1806         struct se_cmd *se_cmd = &cmd->se_cmd;
1807         struct isert_conn *isert_conn = isert_cmd->conn;
1808         struct isert_device *device = isert_conn->conn_device;
1809         int ret = 0;
1810
1811         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1812                 ret = isert_check_pi_status(se_cmd,
1813                                             wr->fr_desc->pi_ctx->sig_mr);
1814                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1815         }
1816
1817         iscsit_stop_dataout_timer(cmd);
1818         device->unreg_rdma_mem(isert_cmd, isert_conn);
1819         cmd->write_data_done = wr->data.len;
1820         wr->send_wr_num = 0;
1821
1822         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1823         spin_lock_bh(&cmd->istate_lock);
1824         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1825         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1826         spin_unlock_bh(&cmd->istate_lock);
1827
1828         if (ret)
1829                 transport_send_check_condition_and_sense(se_cmd,
1830                                                          se_cmd->pi_err, 0);
1831         else
1832                 target_execute_cmd(se_cmd);
1833 }
1834
1835 static void
1836 isert_do_control_comp(struct work_struct *work)
1837 {
1838         struct isert_cmd *isert_cmd = container_of(work,
1839                         struct isert_cmd, comp_work);
1840         struct isert_conn *isert_conn = isert_cmd->conn;
1841         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1842         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1843
1844         switch (cmd->i_state) {
1845         case ISTATE_SEND_TASKMGTRSP:
1846                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1847
1848                 atomic_dec(&isert_conn->post_send_buf_count);
1849                 iscsit_tmr_post_handler(cmd, cmd->conn);
1850
1851                 cmd->i_state = ISTATE_SENT_STATUS;
1852                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1853                 break;
1854         case ISTATE_SEND_REJECT:
1855                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1856                 atomic_dec(&isert_conn->post_send_buf_count);
1857
1858                 cmd->i_state = ISTATE_SENT_STATUS;
1859                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1860                 break;
1861         case ISTATE_SEND_LOGOUTRSP:
1862                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1863
1864                 atomic_dec(&isert_conn->post_send_buf_count);
1865                 iscsit_logout_post_handler(cmd, cmd->conn);
1866                 break;
1867         case ISTATE_SEND_TEXTRSP:
1868                 atomic_dec(&isert_conn->post_send_buf_count);
1869                 cmd->i_state = ISTATE_SENT_STATUS;
1870                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1871                 break;
1872         default:
1873                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1874                 dump_stack();
1875                 break;
1876         }
1877 }
1878
1879 static void
1880 isert_response_completion(struct iser_tx_desc *tx_desc,
1881                           struct isert_cmd *isert_cmd,
1882                           struct isert_conn *isert_conn,
1883                           struct ib_device *ib_dev)
1884 {
1885         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1886         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1887
1888         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1889             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1890             cmd->i_state == ISTATE_SEND_REJECT ||
1891             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1892                 isert_unmap_tx_desc(tx_desc, ib_dev);
1893
1894                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1895                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1896                 return;
1897         }
1898
1899         /**
1900          * If send_wr_num is 0 this means that we got
1901          * RDMA completion and we cleared it and we should
1902          * simply decrement the response post. else the
1903          * response is incorporated in send_wr_num, just
1904          * sub it.
1905          **/
1906         if (wr->send_wr_num)
1907                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1908         else
1909                 atomic_dec(&isert_conn->post_send_buf_count);
1910
1911         cmd->i_state = ISTATE_SENT_STATUS;
1912         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1913 }
1914
1915 static void
1916 __isert_send_completion(struct iser_tx_desc *tx_desc,
1917                         struct isert_conn *isert_conn)
1918 {
1919         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1920         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1921         struct isert_rdma_wr *wr;
1922
1923         if (!isert_cmd) {
1924                 atomic_dec(&isert_conn->post_send_buf_count);
1925                 isert_unmap_tx_desc(tx_desc, ib_dev);
1926                 return;
1927         }
1928         wr = &isert_cmd->rdma_wr;
1929
1930         switch (wr->iser_ib_op) {
1931         case ISER_IB_RECV:
1932                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1933                 dump_stack();
1934                 break;
1935         case ISER_IB_SEND:
1936                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1937                 isert_response_completion(tx_desc, isert_cmd,
1938                                           isert_conn, ib_dev);
1939                 break;
1940         case ISER_IB_RDMA_WRITE:
1941                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1942                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1943                 isert_completion_rdma_write(tx_desc, isert_cmd);
1944                 break;
1945         case ISER_IB_RDMA_READ:
1946                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1947
1948                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1949                 isert_completion_rdma_read(tx_desc, isert_cmd);
1950                 break;
1951         default:
1952                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1953                 dump_stack();
1954                 break;
1955         }
1956 }
1957
1958 static void
1959 isert_send_completion(struct iser_tx_desc *tx_desc,
1960                       struct isert_conn *isert_conn)
1961 {
1962         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1963         struct iser_tx_desc *t;
1964         /*
1965          * Drain coalesced completion llist starting from comp_llnode_batch
1966          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1967          */
1968         while (llnode) {
1969                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1970                 llnode = llist_next(llnode);
1971                 __isert_send_completion(t, isert_conn);
1972         }
1973         __isert_send_completion(tx_desc, isert_conn);
1974 }
1975
1976 static void
1977 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1978 {
1979         struct llist_node *llnode;
1980         struct isert_rdma_wr *wr;
1981         struct iser_tx_desc *t;
1982
1983         mutex_lock(&isert_conn->conn_mutex);
1984         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1985         isert_conn->conn_comp_batch = 0;
1986         mutex_unlock(&isert_conn->conn_mutex);
1987
1988         while (llnode) {
1989                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1990                 llnode = llist_next(llnode);
1991                 wr = &t->isert_cmd->rdma_wr;
1992
1993                 /**
1994                  * If send_wr_num is 0 this means that we got
1995                  * RDMA completion and we cleared it and we should
1996                  * simply decrement the response post. else the
1997                  * response is incorporated in send_wr_num, just
1998                  * sub it.
1999                  **/
2000                 if (wr->send_wr_num)
2001                         atomic_sub(wr->send_wr_num,
2002                                    &isert_conn->post_send_buf_count);
2003                 else
2004                         atomic_dec(&isert_conn->post_send_buf_count);
2005
2006                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2007         }
2008 }
2009
2010 static void
2011 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
2012 {
2013         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2014         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2015         struct llist_node *llnode = tx_desc->comp_llnode_batch;
2016         struct isert_rdma_wr *wr;
2017         struct iser_tx_desc *t;
2018
2019         while (llnode) {
2020                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2021                 llnode = llist_next(llnode);
2022                 wr = &t->isert_cmd->rdma_wr;
2023
2024                 /**
2025                  * If send_wr_num is 0 this means that we got
2026                  * RDMA completion and we cleared it and we should
2027                  * simply decrement the response post. else the
2028                  * response is incorporated in send_wr_num, just
2029                  * sub it.
2030                  **/
2031                 if (wr->send_wr_num)
2032                         atomic_sub(wr->send_wr_num,
2033                                    &isert_conn->post_send_buf_count);
2034                 else
2035                         atomic_dec(&isert_conn->post_send_buf_count);
2036
2037                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2038         }
2039         tx_desc->comp_llnode_batch = NULL;
2040
2041         if (!isert_cmd)
2042                 isert_unmap_tx_desc(tx_desc, ib_dev);
2043         else
2044                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2045 }
2046
2047 static void
2048 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2049 {
2050         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2051         struct iscsi_conn *conn = isert_conn->conn;
2052
2053         if (isert_conn->post_recv_buf_count)
2054                 return;
2055
2056         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2057
2058         if (conn->sess) {
2059                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2060                 target_wait_for_sess_cmds(conn->sess->se_sess);
2061         }
2062
2063         while (atomic_read(&isert_conn->post_send_buf_count))
2064                 msleep(3000);
2065
2066         mutex_lock(&isert_conn->conn_mutex);
2067         isert_conn_terminate(isert_conn);
2068         mutex_unlock(&isert_conn->conn_mutex);
2069
2070         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2071
2072         complete(&isert_conn->conn_wait_comp_err);
2073 }
2074
2075 static void
2076 isert_cq_tx_work(struct work_struct *work)
2077 {
2078         struct isert_cq_desc *cq_desc = container_of(work,
2079                                 struct isert_cq_desc, cq_tx_work);
2080         struct isert_device *device = cq_desc->device;
2081         int cq_index = cq_desc->cq_index;
2082         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2083         struct isert_conn *isert_conn;
2084         struct iser_tx_desc *tx_desc;
2085         struct ib_wc wc;
2086
2087         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2088                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2089                 isert_conn = wc.qp->qp_context;
2090
2091                 if (wc.status == IB_WC_SUCCESS) {
2092                         isert_send_completion(tx_desc, isert_conn);
2093                 } else {
2094                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2095                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2096                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2097
2098                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2099                                 if (tx_desc->llnode_active)
2100                                         continue;
2101
2102                                 atomic_dec(&isert_conn->post_send_buf_count);
2103                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2104                         }
2105                 }
2106         }
2107
2108         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2109 }
2110
2111 static void
2112 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2113 {
2114         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2115
2116         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2117 }
2118
2119 static void
2120 isert_cq_rx_work(struct work_struct *work)
2121 {
2122         struct isert_cq_desc *cq_desc = container_of(work,
2123                         struct isert_cq_desc, cq_rx_work);
2124         struct isert_device *device = cq_desc->device;
2125         int cq_index = cq_desc->cq_index;
2126         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2127         struct isert_conn *isert_conn;
2128         struct iser_rx_desc *rx_desc;
2129         struct ib_wc wc;
2130         unsigned long xfer_len;
2131
2132         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2133                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2134                 isert_conn = wc.qp->qp_context;
2135
2136                 if (wc.status == IB_WC_SUCCESS) {
2137                         xfer_len = (unsigned long)wc.byte_len;
2138                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2139                 } else {
2140                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2141                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2142                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2143                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2144                                          wc.vendor_err);
2145                         }
2146                         isert_conn->post_recv_buf_count--;
2147                         isert_cq_rx_comp_err(isert_conn);
2148                 }
2149         }
2150
2151         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2152 }
2153
2154 static void
2155 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2156 {
2157         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2158
2159         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2160 }
2161
2162 static int
2163 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2164 {
2165         struct ib_send_wr *wr_failed;
2166         int ret;
2167
2168         atomic_inc(&isert_conn->post_send_buf_count);
2169
2170         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2171                            &wr_failed);
2172         if (ret) {
2173                 pr_err("ib_post_send failed with %d\n", ret);
2174                 atomic_dec(&isert_conn->post_send_buf_count);
2175                 return ret;
2176         }
2177         return ret;
2178 }
2179
2180 static int
2181 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2182 {
2183         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2184         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2185         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2186         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2187                                 &isert_cmd->tx_desc.iscsi_header;
2188
2189         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2190         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2191         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2192         /*
2193          * Attach SENSE DATA payload to iSCSI Response PDU
2194          */
2195         if (cmd->se_cmd.sense_buffer &&
2196             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2197             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2198                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2199                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2200                 u32 padding, pdu_len;
2201
2202                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2203                                    cmd->sense_buffer);
2204                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2205
2206                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2207                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2208                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2209
2210                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2211                                 (void *)cmd->sense_buffer, pdu_len,
2212                                 DMA_TO_DEVICE);
2213
2214                 isert_cmd->pdu_buf_len = pdu_len;
2215                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2216                 tx_dsg->length  = pdu_len;
2217                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2218                 isert_cmd->tx_desc.num_sge = 2;
2219         }
2220
2221         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2222
2223         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2224
2225         return isert_post_response(isert_conn, isert_cmd);
2226 }
2227
2228 static void
2229 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2230 {
2231         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2232         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2233         struct isert_device *device = isert_conn->conn_device;
2234
2235         spin_lock_bh(&conn->cmd_lock);
2236         if (!list_empty(&cmd->i_conn_node))
2237                 list_del_init(&cmd->i_conn_node);
2238         spin_unlock_bh(&conn->cmd_lock);
2239
2240         if (cmd->data_direction == DMA_TO_DEVICE)
2241                 iscsit_stop_dataout_timer(cmd);
2242
2243         device->unreg_rdma_mem(isert_cmd, isert_conn);
2244 }
2245
2246 static enum target_prot_op
2247 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2248 {
2249         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2250         struct isert_device *device = isert_conn->conn_device;
2251
2252         if (device->pi_capable)
2253                 return TARGET_PROT_ALL;
2254
2255         return TARGET_PROT_NORMAL;
2256 }
2257
2258 static int
2259 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2260                 bool nopout_response)
2261 {
2262         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2263         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2264         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2265
2266         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2267         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2268                                &isert_cmd->tx_desc.iscsi_header,
2269                                nopout_response);
2270         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2271         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2272
2273         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2274
2275         return isert_post_response(isert_conn, isert_cmd);
2276 }
2277
2278 static int
2279 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2280 {
2281         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2282         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2283         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2284
2285         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2286         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2287                                 &isert_cmd->tx_desc.iscsi_header);
2288         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2289         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2290
2291         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2292
2293         return isert_post_response(isert_conn, isert_cmd);
2294 }
2295
2296 static int
2297 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2298 {
2299         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2300         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2301         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2302
2303         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2304         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2305                                   &isert_cmd->tx_desc.iscsi_header);
2306         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2307         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2308
2309         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2310
2311         return isert_post_response(isert_conn, isert_cmd);
2312 }
2313
2314 static int
2315 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2316 {
2317         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2318         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2319         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2320         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2321         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2322         struct iscsi_reject *hdr =
2323                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2324
2325         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2326         iscsit_build_reject(cmd, conn, hdr);
2327         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2328
2329         hton24(hdr->dlength, ISCSI_HDR_LEN);
2330         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2331                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2332                         DMA_TO_DEVICE);
2333         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2334         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2335         tx_dsg->length  = ISCSI_HDR_LEN;
2336         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2337         isert_cmd->tx_desc.num_sge = 2;
2338
2339         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2340
2341         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2342
2343         return isert_post_response(isert_conn, isert_cmd);
2344 }
2345
2346 static int
2347 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2348 {
2349         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2350         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2351         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2352         struct iscsi_text_rsp *hdr =
2353                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2354         u32 txt_rsp_len;
2355         int rc;
2356
2357         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2358         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2359         if (rc < 0)
2360                 return rc;
2361
2362         txt_rsp_len = rc;
2363         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2364
2365         if (txt_rsp_len) {
2366                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2367                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2368                 void *txt_rsp_buf = cmd->buf_ptr;
2369
2370                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2371                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2372
2373                 isert_cmd->pdu_buf_len = txt_rsp_len;
2374                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2375                 tx_dsg->length  = txt_rsp_len;
2376                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2377                 isert_cmd->tx_desc.num_sge = 2;
2378         }
2379         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2380
2381         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2382
2383         return isert_post_response(isert_conn, isert_cmd);
2384 }
2385
2386 static int
2387 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2388                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2389                     u32 data_left, u32 offset)
2390 {
2391         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2392         struct scatterlist *sg_start, *tmp_sg;
2393         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2394         u32 sg_off, page_off;
2395         int i = 0, sg_nents;
2396
2397         sg_off = offset / PAGE_SIZE;
2398         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2399         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2400         page_off = offset % PAGE_SIZE;
2401
2402         send_wr->sg_list = ib_sge;
2403         send_wr->num_sge = sg_nents;
2404         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2405         /*
2406          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2407          */
2408         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2409                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2410                          (unsigned long long)tmp_sg->dma_address,
2411                          tmp_sg->length, page_off);
2412
2413                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2414                 ib_sge->length = min_t(u32, data_left,
2415                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2416                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2417
2418                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2419                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2420                 page_off = 0;
2421                 data_left -= ib_sge->length;
2422                 ib_sge++;
2423                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2424         }
2425
2426         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2427                  send_wr->sg_list, send_wr->num_sge);
2428
2429         return sg_nents;
2430 }
2431
2432 static int
2433 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434                struct isert_rdma_wr *wr)
2435 {
2436         struct se_cmd *se_cmd = &cmd->se_cmd;
2437         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2438         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2439         struct isert_data_buf *data = &wr->data;
2440         struct ib_send_wr *send_wr;
2441         struct ib_sge *ib_sge;
2442         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2443         int ret = 0, i, ib_sge_cnt;
2444
2445         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2446
2447         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2448         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2449                                  se_cmd->t_data_nents, se_cmd->data_length,
2450                                  offset, wr->iser_ib_op, &wr->data);
2451         if (ret)
2452                 return ret;
2453
2454         data_left = data->len;
2455         offset = data->offset;
2456
2457         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2458         if (!ib_sge) {
2459                 pr_warn("Unable to allocate ib_sge\n");
2460                 ret = -ENOMEM;
2461                 goto unmap_cmd;
2462         }
2463         wr->ib_sge = ib_sge;
2464
2465         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2466         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2467                                 GFP_KERNEL);
2468         if (!wr->send_wr) {
2469                 pr_debug("Unable to allocate wr->send_wr\n");
2470                 ret = -ENOMEM;
2471                 goto unmap_cmd;
2472         }
2473
2474         wr->isert_cmd = isert_cmd;
2475         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2476
2477         for (i = 0; i < wr->send_wr_num; i++) {
2478                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2479                 data_len = min(data_left, rdma_write_max);
2480
2481                 send_wr->send_flags = 0;
2482                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2483                         send_wr->opcode = IB_WR_RDMA_WRITE;
2484                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2485                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2486                         if (i + 1 == wr->send_wr_num)
2487                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2488                         else
2489                                 send_wr->next = &wr->send_wr[i + 1];
2490                 } else {
2491                         send_wr->opcode = IB_WR_RDMA_READ;
2492                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2493                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2494                         if (i + 1 == wr->send_wr_num)
2495                                 send_wr->send_flags = IB_SEND_SIGNALED;
2496                         else
2497                                 send_wr->next = &wr->send_wr[i + 1];
2498                 }
2499
2500                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2501                                         send_wr, data_len, offset);
2502                 ib_sge += ib_sge_cnt;
2503
2504                 offset += data_len;
2505                 va_offset += data_len;
2506                 data_left -= data_len;
2507         }
2508
2509         return 0;
2510 unmap_cmd:
2511         isert_unmap_data_buf(isert_conn, data);
2512
2513         return ret;
2514 }
2515
2516 static int
2517 isert_map_fr_pagelist(struct ib_device *ib_dev,
2518                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2519 {
2520         u64 start_addr, end_addr, page, chunk_start = 0;
2521         struct scatterlist *tmp_sg;
2522         int i = 0, new_chunk, last_ent, n_pages;
2523
2524         n_pages = 0;
2525         new_chunk = 1;
2526         last_ent = sg_nents - 1;
2527         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2528                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2529                 if (new_chunk)
2530                         chunk_start = start_addr;
2531                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2532
2533                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2534                          i, (unsigned long long)tmp_sg->dma_address,
2535                          tmp_sg->length);
2536
2537                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2538                         new_chunk = 0;
2539                         continue;
2540                 }
2541                 new_chunk = 1;
2542
2543                 page = chunk_start & PAGE_MASK;
2544                 do {
2545                         fr_pl[n_pages++] = page;
2546                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2547                                  n_pages - 1, page);
2548                         page += PAGE_SIZE;
2549                 } while (page < end_addr);
2550         }
2551
2552         return n_pages;
2553 }
2554
2555 static int
2556 isert_fast_reg_mr(struct isert_conn *isert_conn,
2557                   struct fast_reg_descriptor *fr_desc,
2558                   struct isert_data_buf *mem,
2559                   enum isert_indicator ind,
2560                   struct ib_sge *sge)
2561 {
2562         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2563         struct ib_mr *mr;
2564         struct ib_fast_reg_page_list *frpl;
2565         struct ib_send_wr fr_wr, inv_wr;
2566         struct ib_send_wr *bad_wr, *wr = NULL;
2567         int ret, pagelist_len;
2568         u32 page_off;
2569         u8 key;
2570
2571         if (mem->dma_nents == 1) {
2572                 sge->lkey = isert_conn->conn_mr->lkey;
2573                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2574                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2575                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2576                          __func__, __LINE__, sge->addr, sge->length,
2577                          sge->lkey);
2578                 return 0;
2579         }
2580
2581         if (ind == ISERT_DATA_KEY_VALID) {
2582                 /* Registering data buffer */
2583                 mr = fr_desc->data_mr;
2584                 frpl = fr_desc->data_frpl;
2585         } else {
2586                 /* Registering protection buffer */
2587                 mr = fr_desc->pi_ctx->prot_mr;
2588                 frpl = fr_desc->pi_ctx->prot_frpl;
2589         }
2590
2591         page_off = mem->offset % PAGE_SIZE;
2592
2593         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2594                  fr_desc, mem->nents, mem->offset);
2595
2596         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2597                                              &frpl->page_list[0]);
2598
2599         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2600                 memset(&inv_wr, 0, sizeof(inv_wr));
2601                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2602                 inv_wr.opcode = IB_WR_LOCAL_INV;
2603                 inv_wr.ex.invalidate_rkey = mr->rkey;
2604                 wr = &inv_wr;
2605                 /* Bump the key */
2606                 key = (u8)(mr->rkey & 0x000000FF);
2607                 ib_update_fast_reg_key(mr, ++key);
2608         }
2609
2610         /* Prepare FASTREG WR */
2611         memset(&fr_wr, 0, sizeof(fr_wr));
2612         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2613         fr_wr.opcode = IB_WR_FAST_REG_MR;
2614         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2615         fr_wr.wr.fast_reg.page_list = frpl;
2616         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2617         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2618         fr_wr.wr.fast_reg.length = mem->len;
2619         fr_wr.wr.fast_reg.rkey = mr->rkey;
2620         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2621
2622         if (!wr)
2623                 wr = &fr_wr;
2624         else
2625                 wr->next = &fr_wr;
2626
2627         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2628         if (ret) {
2629                 pr_err("fast registration failed, ret:%d\n", ret);
2630                 return ret;
2631         }
2632         fr_desc->ind &= ~ind;
2633
2634         sge->lkey = mr->lkey;
2635         sge->addr = frpl->page_list[0] + page_off;
2636         sge->length = mem->len;
2637
2638         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2639                  __func__, __LINE__, sge->addr, sge->length,
2640                  sge->lkey);
2641
2642         return ret;
2643 }
2644
2645 static inline void
2646 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2647                      struct ib_sig_domain *domain)
2648 {
2649         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2650         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2651         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2652         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2653         /*
2654          * At the moment we hard code those, but if in the future
2655          * the target core would like to use it, we will take it
2656          * from se_cmd.
2657          */
2658         domain->sig.dif.apptag_check_mask = 0xffff;
2659         domain->sig.dif.app_escape = true;
2660         domain->sig.dif.ref_escape = true;
2661         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2662             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2663                 domain->sig.dif.ref_remap = true;
2664 };
2665
2666 static int
2667 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2668 {
2669         switch (se_cmd->prot_op) {
2670         case TARGET_PROT_DIN_INSERT:
2671         case TARGET_PROT_DOUT_STRIP:
2672                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2673                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2674                 break;
2675         case TARGET_PROT_DOUT_INSERT:
2676         case TARGET_PROT_DIN_STRIP:
2677                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2678                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2679                 break;
2680         case TARGET_PROT_DIN_PASS:
2681         case TARGET_PROT_DOUT_PASS:
2682                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2683                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2684                 break;
2685         default:
2686                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2687                 return -EINVAL;
2688         }
2689
2690         return 0;
2691 }
2692
2693 static inline u8
2694 isert_set_prot_checks(u8 prot_checks)
2695 {
2696         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2697                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2698                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2699 }
2700
2701 static int
2702 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2703                  struct fast_reg_descriptor *fr_desc,
2704                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2705                  struct ib_sge *sig_sge)
2706 {
2707         struct ib_send_wr sig_wr, inv_wr;
2708         struct ib_send_wr *bad_wr, *wr = NULL;
2709         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2710         struct ib_sig_attrs sig_attrs;
2711         int ret;
2712         u32 key;
2713
2714         memset(&sig_attrs, 0, sizeof(sig_attrs));
2715         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2716         if (ret)
2717                 goto err;
2718
2719         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2720
2721         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2722                 memset(&inv_wr, 0, sizeof(inv_wr));
2723                 inv_wr.opcode = IB_WR_LOCAL_INV;
2724                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2725                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2726                 wr = &inv_wr;
2727                 /* Bump the key */
2728                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2729                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2730         }
2731
2732         memset(&sig_wr, 0, sizeof(sig_wr));
2733         sig_wr.opcode = IB_WR_REG_SIG_MR;
2734         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2735         sig_wr.sg_list = data_sge;
2736         sig_wr.num_sge = 1;
2737         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2738         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2739         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2740         if (se_cmd->t_prot_sg)
2741                 sig_wr.wr.sig_handover.prot = prot_sge;
2742
2743         if (!wr)
2744                 wr = &sig_wr;
2745         else
2746                 wr->next = &sig_wr;
2747
2748         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2749         if (ret) {
2750                 pr_err("fast registration failed, ret:%d\n", ret);
2751                 goto err;
2752         }
2753         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2754
2755         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2756         sig_sge->addr = 0;
2757         sig_sge->length = se_cmd->data_length;
2758         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2759             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2760                 /*
2761                  * We have protection guards on the wire
2762                  * so we need to set a larget transfer
2763                  */
2764                 sig_sge->length += se_cmd->prot_length;
2765
2766         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2767                  sig_sge->addr, sig_sge->length,
2768                  sig_sge->lkey);
2769 err:
2770         return ret;
2771 }
2772
2773 static int
2774 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2775                struct isert_rdma_wr *wr)
2776 {
2777         struct se_cmd *se_cmd = &cmd->se_cmd;
2778         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2779         struct isert_conn *isert_conn = conn->context;
2780         struct ib_sge data_sge;
2781         struct ib_send_wr *send_wr;
2782         struct fast_reg_descriptor *fr_desc = NULL;
2783         u32 offset;
2784         int ret = 0;
2785         unsigned long flags;
2786
2787         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2788
2789         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2790         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2791                                  se_cmd->t_data_nents, se_cmd->data_length,
2792                                  offset, wr->iser_ib_op, &wr->data);
2793         if (ret)
2794                 return ret;
2795
2796         if (wr->data.dma_nents != 1 ||
2797             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2798                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2799                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2800                                            struct fast_reg_descriptor, list);
2801                 list_del(&fr_desc->list);
2802                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2803                 wr->fr_desc = fr_desc;
2804         }
2805
2806         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2807                                 ISERT_DATA_KEY_VALID, &data_sge);
2808         if (ret)
2809                 goto unmap_cmd;
2810
2811         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2812                 struct ib_sge prot_sge, sig_sge;
2813
2814                 if (se_cmd->t_prot_sg) {
2815                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2816                                                  se_cmd->t_prot_sg,
2817                                                  se_cmd->t_prot_nents,
2818                                                  se_cmd->prot_length,
2819                                                  0, wr->iser_ib_op, &wr->prot);
2820                         if (ret)
2821                                 goto unmap_cmd;
2822
2823                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2824                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2825                         if (ret)
2826                                 goto unmap_prot_cmd;
2827                 }
2828
2829                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2830                                        &data_sge, &prot_sge, &sig_sge);
2831                 if (ret)
2832                         goto unmap_prot_cmd;
2833
2834                 fr_desc->ind |= ISERT_PROTECTED;
2835                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2836         } else
2837                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2838
2839         wr->ib_sge = &wr->s_ib_sge;
2840         wr->send_wr_num = 1;
2841         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2842         wr->send_wr = &wr->s_send_wr;
2843         wr->isert_cmd = isert_cmd;
2844
2845         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2846         send_wr->sg_list = &wr->s_ib_sge;
2847         send_wr->num_sge = 1;
2848         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2849         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2850                 send_wr->opcode = IB_WR_RDMA_WRITE;
2851                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2852                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2853                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2854                                       0 : IB_SEND_SIGNALED;
2855         } else {
2856                 send_wr->opcode = IB_WR_RDMA_READ;
2857                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2858                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2859                 send_wr->send_flags = IB_SEND_SIGNALED;
2860         }
2861
2862         return 0;
2863 unmap_prot_cmd:
2864         if (se_cmd->t_prot_sg)
2865                 isert_unmap_data_buf(isert_conn, &wr->prot);
2866 unmap_cmd:
2867         if (fr_desc) {
2868                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2869                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2870                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2871         }
2872         isert_unmap_data_buf(isert_conn, &wr->data);
2873
2874         return ret;
2875 }
2876
2877 static int
2878 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2879 {
2880         struct se_cmd *se_cmd = &cmd->se_cmd;
2881         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2882         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2883         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2884         struct isert_device *device = isert_conn->conn_device;
2885         struct ib_send_wr *wr_failed;
2886         int rc;
2887
2888         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2889                  isert_cmd, se_cmd->data_length);
2890         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2891         rc = device->reg_rdma_mem(conn, cmd, wr);
2892         if (rc) {
2893                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2894                 return rc;
2895         }
2896
2897         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2898                 /*
2899                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2900                  */
2901                 isert_create_send_desc(isert_conn, isert_cmd,
2902                                        &isert_cmd->tx_desc);
2903                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2904                                      &isert_cmd->tx_desc.iscsi_header);
2905                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2906                 isert_init_send_wr(isert_conn, isert_cmd,
2907                                    &isert_cmd->tx_desc.send_wr, false);
2908                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2909                 wr->send_wr_num += 1;
2910         }
2911
2912         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2913
2914         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2915         if (rc) {
2916                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2917                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2918         }
2919
2920         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2921                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2922                          "READ\n", isert_cmd);
2923         else
2924                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2925                          isert_cmd);
2926
2927         return 1;
2928 }
2929
2930 static int
2931 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2932 {
2933         struct se_cmd *se_cmd = &cmd->se_cmd;
2934         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2935         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2936         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2937         struct isert_device *device = isert_conn->conn_device;
2938         struct ib_send_wr *wr_failed;
2939         int rc;
2940
2941         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2942                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2943         wr->iser_ib_op = ISER_IB_RDMA_READ;
2944         rc = device->reg_rdma_mem(conn, cmd, wr);
2945         if (rc) {
2946                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2947                 return rc;
2948         }
2949
2950         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2951
2952         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2953         if (rc) {
2954                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2955                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2956         }
2957         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2958                  isert_cmd);
2959
2960         return 0;
2961 }
2962
2963 static int
2964 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2965 {
2966         int ret;
2967
2968         switch (state) {
2969         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2970                 ret = isert_put_nopin(cmd, conn, false);
2971                 break;
2972         default:
2973                 pr_err("Unknown immediate state: 0x%02x\n", state);
2974                 ret = -EINVAL;
2975                 break;
2976         }
2977
2978         return ret;
2979 }
2980
2981 static int
2982 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2983 {
2984         int ret;
2985
2986         switch (state) {
2987         case ISTATE_SEND_LOGOUTRSP:
2988                 ret = isert_put_logout_rsp(cmd, conn);
2989                 if (!ret) {
2990                         pr_debug("Returning iSER Logout -EAGAIN\n");
2991                         ret = -EAGAIN;
2992                 }
2993                 break;
2994         case ISTATE_SEND_NOPIN:
2995                 ret = isert_put_nopin(cmd, conn, true);
2996                 break;
2997         case ISTATE_SEND_TASKMGTRSP:
2998                 ret = isert_put_tm_rsp(cmd, conn);
2999                 break;
3000         case ISTATE_SEND_REJECT:
3001                 ret = isert_put_reject(cmd, conn);
3002                 break;
3003         case ISTATE_SEND_TEXTRSP:
3004                 ret = isert_put_text_rsp(cmd, conn);
3005                 break;
3006         case ISTATE_SEND_STATUS:
3007                 /*
3008                  * Special case for sending non GOOD SCSI status from TX thread
3009                  * context during pre se_cmd excecution failure.
3010                  */
3011                 ret = isert_put_response(conn, cmd);
3012                 break;
3013         default:
3014                 pr_err("Unknown response state: 0x%02x\n", state);
3015                 ret = -EINVAL;
3016                 break;
3017         }
3018
3019         return ret;
3020 }
3021
3022 static int
3023 isert_setup_np(struct iscsi_np *np,
3024                struct __kernel_sockaddr_storage *ksockaddr)
3025 {
3026         struct isert_np *isert_np;
3027         struct rdma_cm_id *isert_lid;
3028         struct sockaddr *sa;
3029         int ret;
3030
3031         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3032         if (!isert_np) {
3033                 pr_err("Unable to allocate struct isert_np\n");
3034                 return -ENOMEM;
3035         }
3036         sema_init(&isert_np->np_sem, 0);
3037         mutex_init(&isert_np->np_accept_mutex);
3038         INIT_LIST_HEAD(&isert_np->np_accept_list);
3039         init_completion(&isert_np->np_login_comp);
3040
3041         sa = (struct sockaddr *)ksockaddr;
3042         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3043         /*
3044          * Setup the np->np_sockaddr from the passed sockaddr setup
3045          * in iscsi_target_configfs.c code..
3046          */
3047         memcpy(&np->np_sockaddr, ksockaddr,
3048                sizeof(struct __kernel_sockaddr_storage));
3049
3050         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3051                                 IB_QPT_RC);
3052         if (IS_ERR(isert_lid)) {
3053                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3054                        PTR_ERR(isert_lid));
3055                 ret = PTR_ERR(isert_lid);
3056                 goto out;
3057         }
3058
3059         ret = rdma_bind_addr(isert_lid, sa);
3060         if (ret) {
3061                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3062                 goto out_lid;
3063         }
3064
3065         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3066         if (ret) {
3067                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3068                 goto out_lid;
3069         }
3070
3071         isert_np->np_cm_id = isert_lid;
3072         np->np_context = isert_np;
3073         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3074
3075         return 0;
3076
3077 out_lid:
3078         rdma_destroy_id(isert_lid);
3079 out:
3080         kfree(isert_np);
3081         return ret;
3082 }
3083
3084 static int
3085 isert_rdma_accept(struct isert_conn *isert_conn)
3086 {
3087         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3088         struct rdma_conn_param cp;
3089         int ret;
3090
3091         memset(&cp, 0, sizeof(struct rdma_conn_param));
3092         cp.initiator_depth = isert_conn->initiator_depth;
3093         cp.retry_count = 7;
3094         cp.rnr_retry_count = 7;
3095
3096         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3097
3098         ret = rdma_accept(cm_id, &cp);
3099         if (ret) {
3100                 pr_err("rdma_accept() failed with: %d\n", ret);
3101                 return ret;
3102         }
3103
3104         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3105
3106         return 0;
3107 }
3108
3109 static int
3110 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3111 {
3112         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3113         int ret;
3114
3115         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3116         /*
3117          * For login requests after the first PDU, isert_rx_login_req() will
3118          * kick schedule_delayed_work(&conn->login_work) as the packet is
3119          * received, which turns this callback from iscsi_target_do_login_rx()
3120          * into a NOP.
3121          */
3122         if (!login->first_request)
3123                 return 0;
3124
3125         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3126         if (ret)
3127                 return ret;
3128
3129         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3130         return 0;
3131 }
3132
3133 static void
3134 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3135                     struct isert_conn *isert_conn)
3136 {
3137         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3138         struct rdma_route *cm_route = &cm_id->route;
3139         struct sockaddr_in *sock_in;
3140         struct sockaddr_in6 *sock_in6;
3141
3142         conn->login_family = np->np_sockaddr.ss_family;
3143
3144         if (np->np_sockaddr.ss_family == AF_INET6) {
3145                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3146                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3147                          &sock_in6->sin6_addr.in6_u);
3148                 conn->login_port = ntohs(sock_in6->sin6_port);
3149
3150                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3151                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3152                          &sock_in6->sin6_addr.in6_u);
3153                 conn->local_port = ntohs(sock_in6->sin6_port);
3154         } else {
3155                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3156                 sprintf(conn->login_ip, "%pI4",
3157                         &sock_in->sin_addr.s_addr);
3158                 conn->login_port = ntohs(sock_in->sin_port);
3159
3160                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3161                 sprintf(conn->local_ip, "%pI4",
3162                         &sock_in->sin_addr.s_addr);
3163                 conn->local_port = ntohs(sock_in->sin_port);
3164         }
3165 }
3166
3167 static int
3168 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3169 {
3170         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3171         struct isert_conn *isert_conn;
3172         int max_accept = 0, ret;
3173
3174 accept_wait:
3175         ret = down_interruptible(&isert_np->np_sem);
3176         if (ret || max_accept > 5)
3177                 return -ENODEV;
3178
3179         spin_lock_bh(&np->np_thread_lock);
3180         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3181                 spin_unlock_bh(&np->np_thread_lock);
3182                 pr_debug("np_thread_state %d for isert_accept_np\n",
3183                          np->np_thread_state);
3184                 /**
3185                  * No point in stalling here when np_thread
3186                  * is in state RESET/SHUTDOWN/EXIT - bail
3187                  **/
3188                 return -ENODEV;
3189         }
3190         spin_unlock_bh(&np->np_thread_lock);
3191
3192         mutex_lock(&isert_np->np_accept_mutex);
3193         if (list_empty(&isert_np->np_accept_list)) {
3194                 mutex_unlock(&isert_np->np_accept_mutex);
3195                 max_accept++;
3196                 goto accept_wait;
3197         }
3198         isert_conn = list_first_entry(&isert_np->np_accept_list,
3199                         struct isert_conn, conn_accept_node);
3200         list_del_init(&isert_conn->conn_accept_node);
3201         mutex_unlock(&isert_np->np_accept_mutex);
3202
3203         conn->context = isert_conn;
3204         isert_conn->conn = conn;
3205         max_accept = 0;
3206
3207         ret = isert_rdma_post_recvl(isert_conn);
3208         if (ret)
3209                 return ret;
3210
3211         ret = isert_rdma_accept(isert_conn);
3212         if (ret)
3213                 return ret;
3214
3215         isert_set_conn_info(np, conn, isert_conn);
3216
3217         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3218         return 0;
3219 }
3220
3221 static void
3222 isert_free_np(struct iscsi_np *np)
3223 {
3224         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3225
3226         if (isert_np->np_cm_id)
3227                 rdma_destroy_id(isert_np->np_cm_id);
3228
3229         np->np_context = NULL;
3230         kfree(isert_np);
3231 }
3232
3233 static void isert_wait_conn(struct iscsi_conn *conn)
3234 {
3235         struct isert_conn *isert_conn = conn->context;
3236
3237         pr_debug("isert_wait_conn: Starting \n");
3238
3239         mutex_lock(&isert_conn->conn_mutex);
3240         /*
3241          * Only wait for conn_wait_comp_err if the isert_conn made it
3242          * into full feature phase..
3243          */
3244         if (isert_conn->state == ISER_CONN_INIT) {
3245                 mutex_unlock(&isert_conn->conn_mutex);
3246                 return;
3247         }
3248         isert_conn_terminate(isert_conn);
3249         mutex_unlock(&isert_conn->conn_mutex);
3250
3251         wait_for_completion(&isert_conn->conn_wait_comp_err);
3252         wait_for_completion(&isert_conn->conn_wait);
3253
3254         mutex_lock(&isert_conn->conn_mutex);
3255         isert_conn->state = ISER_CONN_DOWN;
3256         mutex_unlock(&isert_conn->conn_mutex);
3257
3258         pr_info("Destroying conn %p\n", isert_conn);
3259         isert_put_conn(isert_conn);
3260 }
3261
3262 static void isert_free_conn(struct iscsi_conn *conn)
3263 {
3264         struct isert_conn *isert_conn = conn->context;
3265
3266         isert_put_conn(isert_conn);
3267 }
3268
3269 static struct iscsit_transport iser_target_transport = {
3270         .name                   = "IB/iSER",
3271         .transport_type         = ISCSI_INFINIBAND,
3272         .priv_size              = sizeof(struct isert_cmd),
3273         .owner                  = THIS_MODULE,
3274         .iscsit_setup_np        = isert_setup_np,
3275         .iscsit_accept_np       = isert_accept_np,
3276         .iscsit_free_np         = isert_free_np,
3277         .iscsit_wait_conn       = isert_wait_conn,
3278         .iscsit_free_conn       = isert_free_conn,
3279         .iscsit_get_login_rx    = isert_get_login_rx,
3280         .iscsit_put_login_tx    = isert_put_login_tx,
3281         .iscsit_immediate_queue = isert_immediate_queue,
3282         .iscsit_response_queue  = isert_response_queue,
3283         .iscsit_get_dataout     = isert_get_dataout,
3284         .iscsit_queue_data_in   = isert_put_datain,
3285         .iscsit_queue_status    = isert_put_response,
3286         .iscsit_aborted_task    = isert_aborted_task,
3287         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3288 };
3289
3290 static int __init isert_init(void)
3291 {
3292         int ret;
3293
3294         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3295         if (!isert_rx_wq) {
3296                 pr_err("Unable to allocate isert_rx_wq\n");
3297                 return -ENOMEM;
3298         }
3299
3300         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3301         if (!isert_comp_wq) {
3302                 pr_err("Unable to allocate isert_comp_wq\n");
3303                 ret = -ENOMEM;
3304                 goto destroy_rx_wq;
3305         }
3306
3307         iscsit_register_transport(&iser_target_transport);
3308         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3309         return 0;
3310
3311 destroy_rx_wq:
3312         destroy_workqueue(isert_rx_wq);
3313         return ret;
3314 }
3315
3316 static void __exit isert_exit(void)
3317 {
3318         flush_scheduled_work();
3319         destroy_workqueue(isert_comp_wq);
3320         destroy_workqueue(isert_rx_wq);
3321         iscsit_unregister_transport(&iser_target_transport);
3322         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3323 }
3324
3325 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3326 MODULE_VERSION("0.1");
3327 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3328 MODULE_LICENSE("GPL");
3329
3330 module_init(isert_init);
3331 module_exit(isert_exit);