drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31
  32 #include "isert_proto.h"
  33 #include "ib_isert.h"
  34
  35 #define ISERT_MAX_CONN          8
  36 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  37 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  38
  39 static DEFINE_MUTEX(device_list_mutex);
  40 static LIST_HEAD(device_list);
  41 static struct workqueue_struct *isert_rx_wq;
  42 static struct workqueue_struct *isert_comp_wq;
  43
  44 static void
  45 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  46 static int
  47 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  48                struct isert_rdma_wr *wr);
  49 static void
  50 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  51 static int
  52 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  53                struct isert_rdma_wr *wr);
  54 static int
  55 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  56
  57 static void
  58 isert_qp_event_callback(struct ib_event *e, void *context)
  59 {
  60         struct isert_conn *isert_conn = (struct isert_conn *)context;
  61
  62         pr_err("isert_qp_event_callback event: %d\n", e->event);
  63         switch (e->event) {
  64         case IB_EVENT_COMM_EST:
  65                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  66                 break;
  67         case IB_EVENT_QP_LAST_WQE_REACHED:
  68                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  69                 break;
  70         default:
  71                 break;
  72         }
  73 }
  74
  75 static int
  76 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  77 {
  78         int ret;
  79
  80         ret = ib_query_device(ib_dev, devattr);
  81         if (ret) {
  82                 pr_err("ib_query_device() failed: %d\n", ret);
  83                 return ret;
  84         }
  85         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  86         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  87
  88         return 0;
  89 }
  90
  91 static int
  92 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  93                     u8 protection)
  94 {
  95         struct isert_device *device = isert_conn->conn_device;
  96         struct ib_qp_init_attr attr;
  97         int ret, index, min_index = 0;
  98
  99         mutex_lock(&device_list_mutex);
 100         for (index = 0; index < device->cqs_used; index++)
 101                 if (device->cq_active_qps[index] <
 102                     device->cq_active_qps[min_index])
 103                         min_index = index;
 104         device->cq_active_qps[min_index]++;
 105         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 106         mutex_unlock(&device_list_mutex);
 107
 108         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 109         attr.event_handler = isert_qp_event_callback;
 110         attr.qp_context = isert_conn;
 111         attr.send_cq = device->dev_tx_cq[min_index];
 112         attr.recv_cq = device->dev_rx_cq[min_index];
 113         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 114         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 115         /*
 116          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 117          * work-around for RDMA_READ..
 118          */
 119         attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
 120         isert_conn->max_sge = attr.cap.max_send_sge;
 121
 122         attr.cap.max_recv_sge = 1;
 123         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 124         attr.qp_type = IB_QPT_RC;
 125         if (protection)
 126                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 127
 128         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 129                  cma_id->device);
 130         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 131                  isert_conn->conn_pd->device);
 132
 133         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 134         if (ret) {
 135                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 136                 return ret;
 137         }
 138         isert_conn->conn_qp = cma_id->qp;
 139         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 140
 141         return 0;
 142 }
 143
 144 static void
 145 isert_cq_event_callback(struct ib_event *e, void *context)
 146 {
 147         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 148 }
 149
 150 static int
 151 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 152 {
 153         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 154         struct iser_rx_desc *rx_desc;
 155         struct ib_sge *rx_sg;
 156         u64 dma_addr;
 157         int i, j;
 158
 159         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 160                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 161         if (!isert_conn->conn_rx_descs)
 162                 goto fail;
 163
 164         rx_desc = isert_conn->conn_rx_descs;
 165
 166         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 167                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 168                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 169                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 170                         goto dma_map_fail;
 171
 172                 rx_desc->dma_addr = dma_addr;
 173
 174                 rx_sg = &rx_desc->rx_sg;
 175                 rx_sg->addr = rx_desc->dma_addr;
 176                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 177                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 178         }
 179
 180         isert_conn->conn_rx_desc_head = 0;
 181         return 0;
 182
 183 dma_map_fail:
 184         rx_desc = isert_conn->conn_rx_descs;
 185         for (j = 0; j < i; j++, rx_desc++) {
 186                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 187                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 188         }
 189         kfree(isert_conn->conn_rx_descs);
 190         isert_conn->conn_rx_descs = NULL;
 191 fail:
 192         return -ENOMEM;
 193 }
 194
 195 static void
 196 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 197 {
 198         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 199         struct iser_rx_desc *rx_desc;
 200         int i;
 201
 202         if (!isert_conn->conn_rx_descs)
 203                 return;
 204
 205         rx_desc = isert_conn->conn_rx_descs;
 206         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 207                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 208                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 209         }
 210
 211         kfree(isert_conn->conn_rx_descs);
 212         isert_conn->conn_rx_descs = NULL;
 213 }
 214
 215 static void isert_cq_tx_work(struct work_struct *);
 216 static void isert_cq_tx_callback(struct ib_cq *, void *);
 217 static void isert_cq_rx_work(struct work_struct *);
 218 static void isert_cq_rx_callback(struct ib_cq *, void *);
 219
 220 static int
 221 isert_create_device_ib_res(struct isert_device *device)
 222 {
 223         struct ib_device *ib_dev = device->ib_device;
 224         struct isert_cq_desc *cq_desc;
 225         struct ib_device_attr *dev_attr;
 226         int ret = 0, i, j;
 227
 228         dev_attr = &device->dev_attr;
 229         ret = isert_query_device(ib_dev, dev_attr);
 230         if (ret)
 231                 return ret;
 232
 233         /* asign function handlers */
 234         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 235             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 236                 device->use_fastreg = 1;
 237                 device->reg_rdma_mem = isert_reg_rdma;
 238                 device->unreg_rdma_mem = isert_unreg_rdma;
 239         } else {
 240                 device->use_fastreg = 0;
 241                 device->reg_rdma_mem = isert_map_rdma;
 242                 device->unreg_rdma_mem = isert_unmap_cmd;
 243         }
 244
 245         /* Check signature cap */
 246         device->pi_capable = dev_attr->device_cap_flags &
 247                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 248
 249         device->cqs_used = min_t(int, num_online_cpus(),
 250                                  device->ib_device->num_comp_vectors);
 251         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 252         pr_debug("Using %d CQs, device %s supports %d vectors support "
 253                  "Fast registration %d pi_capable %d\n",
 254                  device->cqs_used, device->ib_device->name,
 255                  device->ib_device->num_comp_vectors, device->use_fastreg,
 256                  device->pi_capable);
 257         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 258                                 device->cqs_used, GFP_KERNEL);
 259         if (!device->cq_desc) {
 260                 pr_err("Unable to allocate device->cq_desc\n");
 261                 return -ENOMEM;
 262         }
 263         cq_desc = device->cq_desc;
 264
 265         for (i = 0; i < device->cqs_used; i++) {
 266                 cq_desc[i].device = device;
 267                 cq_desc[i].cq_index = i;
 268
 269                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 270                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 271                                                 isert_cq_rx_callback,
 272                                                 isert_cq_event_callback,
 273                                                 (void *)&cq_desc[i],
 274                                                 ISER_MAX_RX_CQ_LEN, i);
 275                 if (IS_ERR(device->dev_rx_cq[i])) {
 276                         ret = PTR_ERR(device->dev_rx_cq[i]);
 277                         device->dev_rx_cq[i] = NULL;
 278                         goto out_cq;
 279                 }
 280
 281                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 282                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 283                                                 isert_cq_tx_callback,
 284                                                 isert_cq_event_callback,
 285                                                 (void *)&cq_desc[i],
 286                                                 ISER_MAX_TX_CQ_LEN, i);
 287                 if (IS_ERR(device->dev_tx_cq[i])) {
 288                         ret = PTR_ERR(device->dev_tx_cq[i]);
 289                         device->dev_tx_cq[i] = NULL;
 290                         goto out_cq;
 291                 }
 292
 293                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 294                 if (ret)
 295                         goto out_cq;
 296
 297                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 298                 if (ret)
 299                         goto out_cq;
 300         }
 301
 302         return 0;
 303
 304 out_cq:
 305         for (j = 0; j < i; j++) {
 306                 cq_desc = &device->cq_desc[j];
 307
 308                 if (device->dev_rx_cq[j]) {
 309                         cancel_work_sync(&cq_desc->cq_rx_work);
 310                         ib_destroy_cq(device->dev_rx_cq[j]);
 311                 }
 312                 if (device->dev_tx_cq[j]) {
 313                         cancel_work_sync(&cq_desc->cq_tx_work);
 314                         ib_destroy_cq(device->dev_tx_cq[j]);
 315                 }
 316         }
 317         kfree(device->cq_desc);
 318
 319         return ret;
 320 }
 321
 322 static void
 323 isert_free_device_ib_res(struct isert_device *device)
 324 {
 325         struct isert_cq_desc *cq_desc;
 326         int i;
 327
 328         for (i = 0; i < device->cqs_used; i++) {
 329                 cq_desc = &device->cq_desc[i];
 330
 331                 cancel_work_sync(&cq_desc->cq_rx_work);
 332                 cancel_work_sync(&cq_desc->cq_tx_work);
 333                 ib_destroy_cq(device->dev_rx_cq[i]);
 334                 ib_destroy_cq(device->dev_tx_cq[i]);
 335                 device->dev_rx_cq[i] = NULL;
 336                 device->dev_tx_cq[i] = NULL;
 337         }
 338
 339         kfree(device->cq_desc);
 340 }
 341
 342 static void
 343 isert_device_try_release(struct isert_device *device)
 344 {
 345         mutex_lock(&device_list_mutex);
 346         device->refcount--;
 347         if (!device->refcount) {
 348                 isert_free_device_ib_res(device);
 349                 list_del(&device->dev_node);
 350                 kfree(device);
 351         }
 352         mutex_unlock(&device_list_mutex);
 353 }
 354
 355 static struct isert_device *
 356 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 357 {
 358         struct isert_device *device;
 359         int ret;
 360
 361         mutex_lock(&device_list_mutex);
 362         list_for_each_entry(device, &device_list, dev_node) {
 363                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 364                         device->refcount++;
 365                         mutex_unlock(&device_list_mutex);
 366                         return device;
 367                 }
 368         }
 369
 370         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 371         if (!device) {
 372                 mutex_unlock(&device_list_mutex);
 373                 return ERR_PTR(-ENOMEM);
 374         }
 375
 376         INIT_LIST_HEAD(&device->dev_node);
 377
 378         device->ib_device = cma_id->device;
 379         ret = isert_create_device_ib_res(device);
 380         if (ret) {
 381                 kfree(device);
 382                 mutex_unlock(&device_list_mutex);
 383                 return ERR_PTR(ret);
 384         }
 385
 386         device->refcount++;
 387         list_add_tail(&device->dev_node, &device_list);
 388         mutex_unlock(&device_list_mutex);
 389
 390         return device;
 391 }
 392
 393 static void
 394 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 395 {
 396         struct fast_reg_descriptor *fr_desc, *tmp;
 397         int i = 0;
 398
 399         if (list_empty(&isert_conn->conn_fr_pool))
 400                 return;
 401
 402         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 403
 404         list_for_each_entry_safe(fr_desc, tmp,
 405                                  &isert_conn->conn_fr_pool, list) {
 406                 list_del(&fr_desc->list);
 407                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 408                 ib_dereg_mr(fr_desc->data_mr);
 409                 if (fr_desc->pi_ctx) {
 410                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 411                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 412                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 413                         kfree(fr_desc->pi_ctx);
 414                 }
 415                 kfree(fr_desc);
 416                 ++i;
 417         }
 418
 419         if (i < isert_conn->conn_fr_pool_size)
 420                 pr_warn("Pool still has %d regions registered\n",
 421                         isert_conn->conn_fr_pool_size - i);
 422 }
 423
 424 static int
 425 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 426                      struct fast_reg_descriptor *fr_desc, u8 protection)
 427 {
 428         int ret;
 429
 430         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 431                                                          ISCSI_ISER_SG_TABLESIZE);
 432         if (IS_ERR(fr_desc->data_frpl)) {
 433                 pr_err("Failed to allocate data frpl err=%ld\n",
 434                        PTR_ERR(fr_desc->data_frpl));
 435                 return PTR_ERR(fr_desc->data_frpl);
 436         }
 437
 438         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 439         if (IS_ERR(fr_desc->data_mr)) {
 440                 pr_err("Failed to allocate data frmr err=%ld\n",
 441                        PTR_ERR(fr_desc->data_mr));
 442                 ret = PTR_ERR(fr_desc->data_mr);
 443                 goto err_data_frpl;
 444         }
 445         pr_debug("Create fr_desc %p page_list %p\n",
 446                  fr_desc, fr_desc->data_frpl->page_list);
 447         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 448
 449         if (protection) {
 450                 struct ib_mr_init_attr mr_init_attr = {0};
 451                 struct pi_context *pi_ctx;
 452
 453                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 454                 if (!fr_desc->pi_ctx) {
 455                         pr_err("Failed to allocate pi context\n");
 456                         ret = -ENOMEM;
 457                         goto err_data_mr;
 458                 }
 459                 pi_ctx = fr_desc->pi_ctx;
 460
 461                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 462                                                     ISCSI_ISER_SG_TABLESIZE);
 463                 if (IS_ERR(pi_ctx->prot_frpl)) {
 464                         pr_err("Failed to allocate prot frpl err=%ld\n",
 465                                PTR_ERR(pi_ctx->prot_frpl));
 466                         ret = PTR_ERR(pi_ctx->prot_frpl);
 467                         goto err_pi_ctx;
 468                 }
 469
 470                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 471                 if (IS_ERR(pi_ctx->prot_mr)) {
 472                         pr_err("Failed to allocate prot frmr err=%ld\n",
 473                                PTR_ERR(pi_ctx->prot_mr));
 474                         ret = PTR_ERR(pi_ctx->prot_mr);
 475                         goto err_prot_frpl;
 476                 }
 477                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 478
 479                 mr_init_attr.max_reg_descriptors = 2;
 480                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 481                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 482                 if (IS_ERR(pi_ctx->sig_mr)) {
 483                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 484                                PTR_ERR(pi_ctx->sig_mr));
 485                         ret = PTR_ERR(pi_ctx->sig_mr);
 486                         goto err_prot_mr;
 487                 }
 488                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 489         }
 490         fr_desc->ind &= ~ISERT_PROTECTED;
 491
 492         return 0;
 493 err_prot_mr:
 494         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 495 err_prot_frpl:
 496         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 497 err_pi_ctx:
 498         kfree(fr_desc->pi_ctx);
 499 err_data_mr:
 500         ib_dereg_mr(fr_desc->data_mr);
 501 err_data_frpl:
 502         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 503
 504         return ret;
 505 }
 506
 507 static int
 508 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 509 {
 510         struct fast_reg_descriptor *fr_desc;
 511         struct isert_device *device = isert_conn->conn_device;
 512         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 513         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 514         int i, ret, tag_num;
 515         /*
 516          * Setup the number of FRMRs based upon the number of tags
 517          * available to session in iscsi_target_locate_portal().
 518          */
 519         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 520         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 521
 522         isert_conn->conn_fr_pool_size = 0;
 523         for (i = 0; i < tag_num; i++) {
 524                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 525                 if (!fr_desc) {
 526                         pr_err("Failed to allocate fast_reg descriptor\n");
 527                         ret = -ENOMEM;
 528                         goto err;
 529                 }
 530
 531                 ret = isert_create_fr_desc(device->ib_device,
 532                                            isert_conn->conn_pd, fr_desc,
 533                                            pi_support);
 534                 if (ret) {
 535                         pr_err("Failed to create fastreg descriptor err=%d\n",
 536                                ret);
 537                         kfree(fr_desc);
 538                         goto err;
 539                 }
 540
 541                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 542                 isert_conn->conn_fr_pool_size++;
 543         }
 544
 545         pr_debug("Creating conn %p fastreg pool size=%d",
 546                  isert_conn, isert_conn->conn_fr_pool_size);
 547
 548         return 0;
 549
 550 err:
 551         isert_conn_free_fastreg_pool(isert_conn);
 552         return ret;
 553 }
 554
 555 static int
 556 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 557 {
 558         struct iscsi_np *np = cma_id->context;
 559         struct isert_np *isert_np = np->np_context;
 560         struct isert_conn *isert_conn;
 561         struct isert_device *device;
 562         struct ib_device *ib_dev = cma_id->device;
 563         int ret = 0;
 564         u8 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 565
 566         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 567                  cma_id, cma_id->context);
 568
 569         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 570         if (!isert_conn) {
 571                 pr_err("Unable to allocate isert_conn\n");
 572                 return -ENOMEM;
 573         }
 574         isert_conn->state = ISER_CONN_INIT;
 575         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 576         init_completion(&isert_conn->conn_login_comp);
 577         init_completion(&isert_conn->conn_wait);
 578         init_completion(&isert_conn->conn_wait_comp_err);
 579         kref_init(&isert_conn->conn_kref);
 580         kref_get(&isert_conn->conn_kref);
 581         mutex_init(&isert_conn->conn_mutex);
 582         spin_lock_init(&isert_conn->conn_lock);
 583         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 584
 585         cma_id->context = isert_conn;
 586         isert_conn->conn_cm_id = cma_id;
 587         isert_conn->responder_resources = event->param.conn.responder_resources;
 588         isert_conn->initiator_depth = event->param.conn.initiator_depth;
 589         pr_debug("Using responder_resources: %u initiator_depth: %u\n",
 590                  isert_conn->responder_resources, isert_conn->initiator_depth);
 591
 592         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 593                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 594         if (!isert_conn->login_buf) {
 595                 pr_err("Unable to allocate isert_conn->login_buf\n");
 596                 ret = -ENOMEM;
 597                 goto out;
 598         }
 599
 600         isert_conn->login_req_buf = isert_conn->login_buf;
 601         isert_conn->login_rsp_buf = isert_conn->login_buf +
 602                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 603         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 604                  isert_conn->login_buf, isert_conn->login_req_buf,
 605                  isert_conn->login_rsp_buf);
 606
 607         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 608                                 (void *)isert_conn->login_req_buf,
 609                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 610
 611         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 612         if (ret) {
 613                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 614                        ret);
 615                 isert_conn->login_req_dma = 0;
 616                 goto out_login_buf;
 617         }
 618
 619         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 620                                         (void *)isert_conn->login_rsp_buf,
 621                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 622
 623         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 624         if (ret) {
 625                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 626                        ret);
 627                 isert_conn->login_rsp_dma = 0;
 628                 goto out_req_dma_map;
 629         }
 630
 631         device = isert_device_find_by_ib_dev(cma_id);
 632         if (IS_ERR(device)) {
 633                 ret = PTR_ERR(device);
 634                 goto out_rsp_dma_map;
 635         }
 636
 637         isert_conn->conn_device = device;
 638         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 639         if (IS_ERR(isert_conn->conn_pd)) {
 640                 ret = PTR_ERR(isert_conn->conn_pd);
 641                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 642                        isert_conn, ret);
 643                 goto out_pd;
 644         }
 645
 646         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 647                                            IB_ACCESS_LOCAL_WRITE);
 648         if (IS_ERR(isert_conn->conn_mr)) {
 649                 ret = PTR_ERR(isert_conn->conn_mr);
 650                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 651                        isert_conn, ret);
 652                 goto out_mr;
 653         }
 654
 655         if (pi_support && !device->pi_capable) {
 656                 pr_err("Protection information requested but not supported\n");
 657                 ret = -EINVAL;
 658                 goto out_mr;
 659         }
 660
 661         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 662         if (ret)
 663                 goto out_conn_dev;
 664
 665         mutex_lock(&isert_np->np_accept_mutex);
 666         list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
 667         mutex_unlock(&isert_np->np_accept_mutex);
 668
 669         pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
 670         wake_up(&isert_np->np_accept_wq);
 671         return 0;
 672
 673 out_conn_dev:
 674         ib_dereg_mr(isert_conn->conn_mr);
 675 out_mr:
 676         ib_dealloc_pd(isert_conn->conn_pd);
 677 out_pd:
 678         isert_device_try_release(device);
 679 out_rsp_dma_map:
 680         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 681                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 682 out_req_dma_map:
 683         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 684                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 685 out_login_buf:
 686         kfree(isert_conn->login_buf);
 687 out:
 688         kfree(isert_conn);
 689         return ret;
 690 }
 691
 692 static void
 693 isert_connect_release(struct isert_conn *isert_conn)
 694 {
 695         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 696         struct isert_device *device = isert_conn->conn_device;
 697         int cq_index;
 698
 699         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 700
 701         if (device && device->use_fastreg)
 702                 isert_conn_free_fastreg_pool(isert_conn);
 703
 704         if (isert_conn->conn_qp) {
 705                 cq_index = ((struct isert_cq_desc *)
 706                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 707                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 708                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 709
 710                 rdma_destroy_qp(isert_conn->conn_cm_id);
 711         }
 712
 713         isert_free_rx_descriptors(isert_conn);
 714         rdma_destroy_id(isert_conn->conn_cm_id);
 715
 716         ib_dereg_mr(isert_conn->conn_mr);
 717         ib_dealloc_pd(isert_conn->conn_pd);
 718
 719         if (isert_conn->login_buf) {
 720                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 721                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 722                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 723                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 724                                     DMA_FROM_DEVICE);
 725                 kfree(isert_conn->login_buf);
 726         }
 727         kfree(isert_conn);
 728
 729         if (device)
 730                 isert_device_try_release(device);
 731
 732         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 733 }
 734
 735 static void
 736 isert_connected_handler(struct rdma_cm_id *cma_id)
 737 {
 738         return;
 739 }
 740
 741 static void
 742 isert_release_conn_kref(struct kref *kref)
 743 {
 744         struct isert_conn *isert_conn = container_of(kref,
 745                                 struct isert_conn, conn_kref);
 746
 747         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 748                  current->comm, current->pid);
 749
 750         isert_connect_release(isert_conn);
 751 }
 752
 753 static void
 754 isert_put_conn(struct isert_conn *isert_conn)
 755 {
 756         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 757 }
 758
 759 static void
 760 isert_disconnect_work(struct work_struct *work)
 761 {
 762         struct isert_conn *isert_conn = container_of(work,
 763                                 struct isert_conn, conn_logout_work);
 764
 765         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 766         mutex_lock(&isert_conn->conn_mutex);
 767         if (isert_conn->state == ISER_CONN_UP)
 768                 isert_conn->state = ISER_CONN_TERMINATING;
 769
 770         if (isert_conn->post_recv_buf_count == 0 &&
 771             atomic_read(&isert_conn->post_send_buf_count) == 0) {
 772                 mutex_unlock(&isert_conn->conn_mutex);
 773                 goto wake_up;
 774         }
 775         if (!isert_conn->conn_cm_id) {
 776                 mutex_unlock(&isert_conn->conn_mutex);
 777                 isert_put_conn(isert_conn);
 778                 return;
 779         }
 780         if (!isert_conn->logout_posted) {
 781                 pr_debug("Calling rdma_disconnect for !logout_posted from"
 782                          " isert_disconnect_work\n");
 783                 rdma_disconnect(isert_conn->conn_cm_id);
 784                 mutex_unlock(&isert_conn->conn_mutex);
 785                 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
 786                 goto wake_up;
 787         }
 788         mutex_unlock(&isert_conn->conn_mutex);
 789
 790 wake_up:
 791         complete(&isert_conn->conn_wait);
 792         isert_put_conn(isert_conn);
 793 }
 794
 795 static void
 796 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 797 {
 798         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 799
 800         INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
 801         schedule_work(&isert_conn->conn_logout_work);
 802 }
 803
 804 static int
 805 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 806 {
 807         int ret = 0;
 808
 809         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 810                  event->event, event->status, cma_id->context, cma_id);
 811
 812         switch (event->event) {
 813         case RDMA_CM_EVENT_CONNECT_REQUEST:
 814                 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
 815                 ret = isert_connect_request(cma_id, event);
 816                 break;
 817         case RDMA_CM_EVENT_ESTABLISHED:
 818                 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
 819                 isert_connected_handler(cma_id);
 820                 break;
 821         case RDMA_CM_EVENT_DISCONNECTED:
 822                 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
 823                 isert_disconnected_handler(cma_id);
 824                 break;
 825         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 826         case RDMA_CM_EVENT_ADDR_CHANGE:
 827                 break;
 828         case RDMA_CM_EVENT_CONNECT_ERROR:
 829         default:
 830                 pr_err("Unknown RDMA CMA event: %d\n", event->event);
 831                 break;
 832         }
 833
 834         if (ret != 0) {
 835                 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 836                        event->event, ret);
 837                 dump_stack();
 838         }
 839
 840         return ret;
 841 }
 842
 843 static int
 844 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 845 {
 846         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 847         int i, ret;
 848         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 849         struct iser_rx_desc *rx_desc;
 850
 851         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 852                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 853                 rx_wr->wr_id    = (unsigned long)rx_desc;
 854                 rx_wr->sg_list  = &rx_desc->rx_sg;
 855                 rx_wr->num_sge  = 1;
 856                 rx_wr->next     = rx_wr + 1;
 857                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 858         }
 859
 860         rx_wr--;
 861         rx_wr->next = NULL; /* mark end of work requests list */
 862
 863         isert_conn->post_recv_buf_count += count;
 864         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 865                                 &rx_wr_failed);
 866         if (ret) {
 867                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 868                 isert_conn->post_recv_buf_count -= count;
 869         } else {
 870                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 871                 isert_conn->conn_rx_desc_head = rx_head;
 872         }
 873         return ret;
 874 }
 875
 876 static int
 877 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 878 {
 879         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 880         struct ib_send_wr send_wr, *send_wr_failed;
 881         int ret;
 882
 883         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 884                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 885
 886         send_wr.next    = NULL;
 887         send_wr.wr_id   = (unsigned long)tx_desc;
 888         send_wr.sg_list = tx_desc->tx_sg;
 889         send_wr.num_sge = tx_desc->num_sge;
 890         send_wr.opcode  = IB_WR_SEND;
 891         send_wr.send_flags = IB_SEND_SIGNALED;
 892
 893         atomic_inc(&isert_conn->post_send_buf_count);
 894
 895         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 896         if (ret) {
 897                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 898                 atomic_dec(&isert_conn->post_send_buf_count);
 899         }
 900
 901         return ret;
 902 }
 903
 904 static void
 905 isert_create_send_desc(struct isert_conn *isert_conn,
 906                        struct isert_cmd *isert_cmd,
 907                        struct iser_tx_desc *tx_desc)
 908 {
 909         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 910
 911         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 912                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 913
 914         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 915         tx_desc->iser_header.flags = ISER_VER;
 916
 917         tx_desc->num_sge = 1;
 918         tx_desc->isert_cmd = isert_cmd;
 919
 920         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 921                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 922                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 923         }
 924 }
 925
 926 static int
 927 isert_init_tx_hdrs(struct isert_conn *isert_conn,
 928                    struct iser_tx_desc *tx_desc)
 929 {
 930         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 931         u64 dma_addr;
 932
 933         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
 934                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 935         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
 936                 pr_err("ib_dma_mapping_error() failed\n");
 937                 return -ENOMEM;
 938         }
 939
 940         tx_desc->dma_addr = dma_addr;
 941         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
 942         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
 943         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 944
 945         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
 946                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
 947                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
 948
 949         return 0;
 950 }
 951
 952 static void
 953 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
 954                    struct ib_send_wr *send_wr, bool coalesce)
 955 {
 956         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
 957
 958         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
 959         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
 960         send_wr->opcode = IB_WR_SEND;
 961         send_wr->sg_list = &tx_desc->tx_sg[0];
 962         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
 963         /*
 964          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
 965          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
 966          */
 967         mutex_lock(&isert_conn->conn_mutex);
 968         if (coalesce && isert_conn->state == ISER_CONN_UP &&
 969             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
 970                 tx_desc->llnode_active = true;
 971                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
 972                 mutex_unlock(&isert_conn->conn_mutex);
 973                 return;
 974         }
 975         isert_conn->conn_comp_batch = 0;
 976         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
 977         mutex_unlock(&isert_conn->conn_mutex);
 978
 979         send_wr->send_flags = IB_SEND_SIGNALED;
 980 }
 981
 982 static int
 983 isert_rdma_post_recvl(struct isert_conn *isert_conn)
 984 {
 985         struct ib_recv_wr rx_wr, *rx_wr_fail;
 986         struct ib_sge sge;
 987         int ret;
 988
 989         memset(&sge, 0, sizeof(struct ib_sge));
 990         sge.addr = isert_conn->login_req_dma;
 991         sge.length = ISER_RX_LOGIN_SIZE;
 992         sge.lkey = isert_conn->conn_mr->lkey;
 993
 994         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
 995                 sge.addr, sge.length, sge.lkey);
 996
 997         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
 998         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
 999         rx_wr.sg_list = &sge;
1000         rx_wr.num_sge = 1;
1001
1002         isert_conn->post_recv_buf_count++;
1003         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1004         if (ret) {
1005                 pr_err("ib_post_recv() failed: %d\n", ret);
1006                 isert_conn->post_recv_buf_count--;
1007         }
1008
1009         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1010         return ret;
1011 }
1012
1013 static int
1014 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1015                    u32 length)
1016 {
1017         struct isert_conn *isert_conn = conn->context;
1018         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1019         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1020         int ret;
1021
1022         isert_create_send_desc(isert_conn, NULL, tx_desc);
1023
1024         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1025                sizeof(struct iscsi_hdr));
1026
1027         isert_init_tx_hdrs(isert_conn, tx_desc);
1028
1029         if (length > 0) {
1030                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1031
1032                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1033                                            length, DMA_TO_DEVICE);
1034
1035                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1036
1037                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1038                                               length, DMA_TO_DEVICE);
1039
1040                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1041                 tx_dsg->length  = length;
1042                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1043                 tx_desc->num_sge = 2;
1044         }
1045         if (!login->login_failed) {
1046                 if (login->login_complete) {
1047                         if (isert_conn->conn_device->use_fastreg) {
1048                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1049
1050                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1051                                                                      pi_support);
1052                                 if (ret) {
1053                                         pr_err("Conn: %p failed to create"
1054                                                " fastreg pool\n", isert_conn);
1055                                         return ret;
1056                                 }
1057                         }
1058
1059                         ret = isert_alloc_rx_descriptors(isert_conn);
1060                         if (ret)
1061                                 return ret;
1062
1063                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1064                         if (ret)
1065                                 return ret;
1066
1067                         isert_conn->state = ISER_CONN_UP;
1068                         goto post_send;
1069                 }
1070
1071                 ret = isert_rdma_post_recvl(isert_conn);
1072                 if (ret)
1073                         return ret;
1074         }
1075 post_send:
1076         ret = isert_post_send(isert_conn, tx_desc);
1077         if (ret)
1078                 return ret;
1079
1080         return 0;
1081 }
1082
1083 static void
1084 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1085                    struct isert_conn *isert_conn)
1086 {
1087         struct iscsi_conn *conn = isert_conn->conn;
1088         struct iscsi_login *login = conn->conn_login;
1089         int size;
1090
1091         if (!login) {
1092                 pr_err("conn->conn_login is NULL\n");
1093                 dump_stack();
1094                 return;
1095         }
1096
1097         if (login->first_request) {
1098                 struct iscsi_login_req *login_req =
1099                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1100                 /*
1101                  * Setup the initial iscsi_login values from the leading
1102                  * login request PDU.
1103                  */
1104                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1105                 login->current_stage =
1106                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1107                          >> 2;
1108                 login->version_min      = login_req->min_version;
1109                 login->version_max      = login_req->max_version;
1110                 memcpy(login->isid, login_req->isid, 6);
1111                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1112                 login->init_task_tag    = login_req->itt;
1113                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1114                 login->cid              = be16_to_cpu(login_req->cid);
1115                 login->tsih             = be16_to_cpu(login_req->tsih);
1116         }
1117
1118         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1119
1120         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1121         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1122                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1123         memcpy(login->req_buf, &rx_desc->data[0], size);
1124
1125         if (login->first_request) {
1126                 complete(&isert_conn->conn_login_comp);
1127                 return;
1128         }
1129         schedule_delayed_work(&conn->login_work, 0);
1130 }
1131
1132 static struct iscsi_cmd
1133 *isert_allocate_cmd(struct iscsi_conn *conn)
1134 {
1135         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1136         struct isert_cmd *isert_cmd;
1137         struct iscsi_cmd *cmd;
1138
1139         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1140         if (!cmd) {
1141                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1142                 return NULL;
1143         }
1144         isert_cmd = iscsit_priv_cmd(cmd);
1145         isert_cmd->conn = isert_conn;
1146         isert_cmd->iscsi_cmd = cmd;
1147
1148         return cmd;
1149 }
1150
1151 static int
1152 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1153                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1154                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1155 {
1156         struct iscsi_conn *conn = isert_conn->conn;
1157         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1158         struct scatterlist *sg;
1159         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1160         bool dump_payload = false;
1161
1162         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1163         if (rc < 0)
1164                 return rc;
1165
1166         imm_data = cmd->immediate_data;
1167         imm_data_len = cmd->first_burst_len;
1168         unsol_data = cmd->unsolicited_data;
1169
1170         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1171         if (rc < 0) {
1172                 return 0;
1173         } else if (rc > 0) {
1174                 dump_payload = true;
1175                 goto sequence_cmd;
1176         }
1177
1178         if (!imm_data)
1179                 return 0;
1180
1181         sg = &cmd->se_cmd.t_data_sg[0];
1182         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1183
1184         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1185                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1186
1187         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1188
1189         cmd->write_data_done += imm_data_len;
1190
1191         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1192                 spin_lock_bh(&cmd->istate_lock);
1193                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1194                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1195                 spin_unlock_bh(&cmd->istate_lock);
1196         }
1197
1198 sequence_cmd:
1199         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1200
1201         if (!rc && dump_payload == false && unsol_data)
1202                 iscsit_set_unsoliticed_dataout(cmd);
1203
1204         return 0;
1205 }
1206
1207 static int
1208 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1209                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1210 {
1211         struct scatterlist *sg_start;
1212         struct iscsi_conn *conn = isert_conn->conn;
1213         struct iscsi_cmd *cmd = NULL;
1214         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1215         u32 unsol_data_len = ntoh24(hdr->dlength);
1216         int rc, sg_nents, sg_off, page_off;
1217
1218         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1219         if (rc < 0)
1220                 return rc;
1221         else if (!cmd)
1222                 return 0;
1223         /*
1224          * FIXME: Unexpected unsolicited_data out
1225          */
1226         if (!cmd->unsolicited_data) {
1227                 pr_err("Received unexpected solicited data payload\n");
1228                 dump_stack();
1229                 return -1;
1230         }
1231
1232         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1233                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1234
1235         sg_off = cmd->write_data_done / PAGE_SIZE;
1236         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1237         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1238         page_off = cmd->write_data_done % PAGE_SIZE;
1239         /*
1240          * FIXME: Non page-aligned unsolicited_data out
1241          */
1242         if (page_off) {
1243                 pr_err("Received unexpected non-page aligned data payload\n");
1244                 dump_stack();
1245                 return -1;
1246         }
1247         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1248                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1249
1250         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1251                             unsol_data_len);
1252
1253         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1254         if (rc < 0)
1255                 return rc;
1256
1257         return 0;
1258 }
1259
1260 static int
1261 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1262                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1263                      unsigned char *buf)
1264 {
1265         struct iscsi_conn *conn = isert_conn->conn;
1266         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1267         int rc;
1268
1269         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1270         if (rc < 0)
1271                 return rc;
1272         /*
1273          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1274          */
1275
1276         return iscsit_process_nop_out(conn, cmd, hdr);
1277 }
1278
1279 static int
1280 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1281                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1282                       struct iscsi_text *hdr)
1283 {
1284         struct iscsi_conn *conn = isert_conn->conn;
1285         u32 payload_length = ntoh24(hdr->dlength);
1286         int rc;
1287         unsigned char *text_in;
1288
1289         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1290         if (rc < 0)
1291                 return rc;
1292
1293         text_in = kzalloc(payload_length, GFP_KERNEL);
1294         if (!text_in) {
1295                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1296                        payload_length);
1297                 return -ENOMEM;
1298         }
1299         cmd->text_in_ptr = text_in;
1300
1301         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1302
1303         return iscsit_process_text_cmd(conn, cmd, hdr);
1304 }
1305
1306 static int
1307 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1308                 uint32_t read_stag, uint64_t read_va,
1309                 uint32_t write_stag, uint64_t write_va)
1310 {
1311         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1312         struct iscsi_conn *conn = isert_conn->conn;
1313         struct iscsi_session *sess = conn->sess;
1314         struct iscsi_cmd *cmd;
1315         struct isert_cmd *isert_cmd;
1316         int ret = -EINVAL;
1317         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1318
1319         if (sess->sess_ops->SessionType &&
1320            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1321                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1322                        " ignoring\n", opcode);
1323                 return 0;
1324         }
1325
1326         switch (opcode) {
1327         case ISCSI_OP_SCSI_CMD:
1328                 cmd = isert_allocate_cmd(conn);
1329                 if (!cmd)
1330                         break;
1331
1332                 isert_cmd = iscsit_priv_cmd(cmd);
1333                 isert_cmd->read_stag = read_stag;
1334                 isert_cmd->read_va = read_va;
1335                 isert_cmd->write_stag = write_stag;
1336                 isert_cmd->write_va = write_va;
1337
1338                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1339                                         rx_desc, (unsigned char *)hdr);
1340                 break;
1341         case ISCSI_OP_NOOP_OUT:
1342                 cmd = isert_allocate_cmd(conn);
1343                 if (!cmd)
1344                         break;
1345
1346                 isert_cmd = iscsit_priv_cmd(cmd);
1347                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1348                                            rx_desc, (unsigned char *)hdr);
1349                 break;
1350         case ISCSI_OP_SCSI_DATA_OUT:
1351                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1352                                                 (unsigned char *)hdr);
1353                 break;
1354         case ISCSI_OP_SCSI_TMFUNC:
1355                 cmd = isert_allocate_cmd(conn);
1356                 if (!cmd)
1357                         break;
1358
1359                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1360                                                 (unsigned char *)hdr);
1361                 break;
1362         case ISCSI_OP_LOGOUT:
1363                 cmd = isert_allocate_cmd(conn);
1364                 if (!cmd)
1365                         break;
1366
1367                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1368                 if (ret > 0)
1369                         wait_for_completion_timeout(&conn->conn_logout_comp,
1370                                                     SECONDS_FOR_LOGOUT_COMP *
1371                                                     HZ);
1372                 break;
1373         case ISCSI_OP_TEXT:
1374                 cmd = isert_allocate_cmd(conn);
1375                 if (!cmd)
1376                         break;
1377
1378                 isert_cmd = iscsit_priv_cmd(cmd);
1379                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1380                                             rx_desc, (struct iscsi_text *)hdr);
1381                 break;
1382         default:
1383                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1384                 dump_stack();
1385                 break;
1386         }
1387
1388         return ret;
1389 }
1390
1391 static void
1392 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1393 {
1394         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1395         uint64_t read_va = 0, write_va = 0;
1396         uint32_t read_stag = 0, write_stag = 0;
1397         int rc;
1398
1399         switch (iser_hdr->flags & 0xF0) {
1400         case ISCSI_CTRL:
1401                 if (iser_hdr->flags & ISER_RSV) {
1402                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1403                         read_va = be64_to_cpu(iser_hdr->read_va);
1404                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1405                                  read_stag, (unsigned long long)read_va);
1406                 }
1407                 if (iser_hdr->flags & ISER_WSV) {
1408                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1409                         write_va = be64_to_cpu(iser_hdr->write_va);
1410                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1411                                  write_stag, (unsigned long long)write_va);
1412                 }
1413
1414                 pr_debug("ISER ISCSI_CTRL PDU\n");
1415                 break;
1416         case ISER_HELLO:
1417                 pr_err("iSER Hello message\n");
1418                 break;
1419         default:
1420                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1421                 break;
1422         }
1423
1424         rc = isert_rx_opcode(isert_conn, rx_desc,
1425                              read_stag, read_va, write_stag, write_va);
1426 }
1427
1428 static void
1429 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1430                     unsigned long xfer_len)
1431 {
1432         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1433         struct iscsi_hdr *hdr;
1434         u64 rx_dma;
1435         int rx_buflen, outstanding;
1436
1437         if ((char *)desc == isert_conn->login_req_buf) {
1438                 rx_dma = isert_conn->login_req_dma;
1439                 rx_buflen = ISER_RX_LOGIN_SIZE;
1440                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1441                          rx_dma, rx_buflen);
1442         } else {
1443                 rx_dma = desc->dma_addr;
1444                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1445                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1446                          rx_dma, rx_buflen);
1447         }
1448
1449         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1450
1451         hdr = &desc->iscsi_header;
1452         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1453                  hdr->opcode, hdr->itt, hdr->flags,
1454                  (int)(xfer_len - ISER_HEADERS_LEN));
1455
1456         if ((char *)desc == isert_conn->login_req_buf)
1457                 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1458                                    isert_conn);
1459         else
1460                 isert_rx_do_work(desc, isert_conn);
1461
1462         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1463                                       DMA_FROM_DEVICE);
1464
1465         isert_conn->post_recv_buf_count--;
1466         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1467                  isert_conn->post_recv_buf_count);
1468
1469         if ((char *)desc == isert_conn->login_req_buf)
1470                 return;
1471
1472         outstanding = isert_conn->post_recv_buf_count;
1473         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1474                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1475                                 ISERT_MIN_POSTED_RX);
1476                 err = isert_post_recv(isert_conn, count);
1477                 if (err) {
1478                         pr_err("isert_post_recv() count: %d failed, %d\n",
1479                                count, err);
1480                 }
1481         }
1482 }
1483
1484 static int
1485 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1486                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1487                    enum iser_ib_op_code op, struct isert_data_buf *data)
1488 {
1489         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1490
1491         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1492                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1493
1494         data->len = length - offset;
1495         data->offset = offset;
1496         data->sg_off = data->offset / PAGE_SIZE;
1497
1498         data->sg = &sg[data->sg_off];
1499         data->nents = min_t(unsigned int, nents - data->sg_off,
1500                                           ISCSI_ISER_SG_TABLESIZE);
1501         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1502                                         PAGE_SIZE);
1503
1504         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1505                                         data->dma_dir);
1506         if (unlikely(!data->dma_nents)) {
1507                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1508                 return -EINVAL;
1509         }
1510
1511         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1512                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1513
1514         return 0;
1515 }
1516
1517 static void
1518 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1519 {
1520         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1521
1522         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1523         memset(data, 0, sizeof(*data));
1524 }
1525
1526
1527
1528 static void
1529 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1530 {
1531         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1532
1533         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1534
1535         if (wr->data.sg) {
1536                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1537                 isert_unmap_data_buf(isert_conn, &wr->data);
1538         }
1539
1540         if (wr->send_wr) {
1541                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1542                 kfree(wr->send_wr);
1543                 wr->send_wr = NULL;
1544         }
1545
1546         if (wr->ib_sge) {
1547                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1548                 kfree(wr->ib_sge);
1549                 wr->ib_sge = NULL;
1550         }
1551 }
1552
1553 static void
1554 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1555 {
1556         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1557         LIST_HEAD(unmap_list);
1558
1559         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1560
1561         if (wr->fr_desc) {
1562                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1563                          isert_cmd, wr->fr_desc);
1564                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1565                         isert_unmap_data_buf(isert_conn, &wr->prot);
1566                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1567                 }
1568                 spin_lock_bh(&isert_conn->conn_lock);
1569                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1570                 spin_unlock_bh(&isert_conn->conn_lock);
1571                 wr->fr_desc = NULL;
1572         }
1573
1574         if (wr->data.sg) {
1575                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1576                 isert_unmap_data_buf(isert_conn, &wr->data);
1577         }
1578
1579         wr->ib_sge = NULL;
1580         wr->send_wr = NULL;
1581 }
1582
1583 static void
1584 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1585 {
1586         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1587         struct isert_conn *isert_conn = isert_cmd->conn;
1588         struct iscsi_conn *conn = isert_conn->conn;
1589         struct isert_device *device = isert_conn->conn_device;
1590
1591         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1592
1593         switch (cmd->iscsi_opcode) {
1594         case ISCSI_OP_SCSI_CMD:
1595                 spin_lock_bh(&conn->cmd_lock);
1596                 if (!list_empty(&cmd->i_conn_node))
1597                         list_del_init(&cmd->i_conn_node);
1598                 spin_unlock_bh(&conn->cmd_lock);
1599
1600                 if (cmd->data_direction == DMA_TO_DEVICE) {
1601                         iscsit_stop_dataout_timer(cmd);
1602                         /*
1603                          * Check for special case during comp_err where
1604                          * WRITE_PENDING has been handed off from core,
1605                          * but requires an extra target_put_sess_cmd()
1606                          * before transport_generic_free_cmd() below.
1607                          */
1608                         if (comp_err &&
1609                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1610                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1611
1612                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1613                         }
1614                 }
1615
1616                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1617                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1618                 break;
1619         case ISCSI_OP_SCSI_TMFUNC:
1620                 spin_lock_bh(&conn->cmd_lock);
1621                 if (!list_empty(&cmd->i_conn_node))
1622                         list_del_init(&cmd->i_conn_node);
1623                 spin_unlock_bh(&conn->cmd_lock);
1624
1625                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1626                 break;
1627         case ISCSI_OP_REJECT:
1628         case ISCSI_OP_NOOP_OUT:
1629         case ISCSI_OP_TEXT:
1630                 spin_lock_bh(&conn->cmd_lock);
1631                 if (!list_empty(&cmd->i_conn_node))
1632                         list_del_init(&cmd->i_conn_node);
1633                 spin_unlock_bh(&conn->cmd_lock);
1634
1635                 /*
1636                  * Handle special case for REJECT when iscsi_add_reject*() has
1637                  * overwritten the original iscsi_opcode assignment, and the
1638                  * associated cmd->se_cmd needs to be released.
1639                  */
1640                 if (cmd->se_cmd.se_tfo != NULL) {
1641                         pr_debug("Calling transport_generic_free_cmd from"
1642                                  " isert_put_cmd for 0x%02x\n",
1643                                  cmd->iscsi_opcode);
1644                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1645                         break;
1646                 }
1647                 /*
1648                  * Fall-through
1649                  */
1650         default:
1651                 iscsit_release_cmd(cmd);
1652                 break;
1653         }
1654 }
1655
1656 static void
1657 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1658 {
1659         if (tx_desc->dma_addr != 0) {
1660                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1661                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1662                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1663                 tx_desc->dma_addr = 0;
1664         }
1665 }
1666
1667 static void
1668 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1669                      struct ib_device *ib_dev, bool comp_err)
1670 {
1671         if (isert_cmd->pdu_buf_dma != 0) {
1672                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1673                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1674                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1675                 isert_cmd->pdu_buf_dma = 0;
1676         }
1677
1678         isert_unmap_tx_desc(tx_desc, ib_dev);
1679         isert_put_cmd(isert_cmd, comp_err);
1680 }
1681
1682 static int
1683 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1684 {
1685         struct ib_mr_status mr_status;
1686         int ret;
1687
1688         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1689         if (ret) {
1690                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1691                 goto fail_mr_status;
1692         }
1693
1694         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1695                 u64 sec_offset_err;
1696                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1697
1698                 switch (mr_status.sig_err.err_type) {
1699                 case IB_SIG_BAD_GUARD:
1700                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1701                         break;
1702                 case IB_SIG_BAD_REFTAG:
1703                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1704                         break;
1705                 case IB_SIG_BAD_APPTAG:
1706                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1707                         break;
1708                 }
1709                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1710                 do_div(sec_offset_err, block_size);
1711                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1712
1713                 pr_err("isert: PI error found type %d at sector 0x%llx "
1714                        "expected 0x%x vs actual 0x%x\n",
1715                        mr_status.sig_err.err_type,
1716                        (unsigned long long)se_cmd->bad_sector,
1717                        mr_status.sig_err.expected,
1718                        mr_status.sig_err.actual);
1719                 ret = 1;
1720         }
1721
1722 fail_mr_status:
1723         return ret;
1724 }
1725
1726 static void
1727 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1728                             struct isert_cmd *isert_cmd)
1729 {
1730         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1731         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1732         struct se_cmd *se_cmd = &cmd->se_cmd;
1733         struct isert_conn *isert_conn = isert_cmd->conn;
1734         struct isert_device *device = isert_conn->conn_device;
1735         int ret = 0;
1736
1737         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1738                 ret = isert_check_pi_status(se_cmd,
1739                                             wr->fr_desc->pi_ctx->sig_mr);
1740                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1741         }
1742
1743         device->unreg_rdma_mem(isert_cmd, isert_conn);
1744         wr->send_wr_num = 0;
1745         if (ret)
1746                 transport_send_check_condition_and_sense(se_cmd,
1747                                                          se_cmd->pi_err, 0);
1748         else
1749                 isert_put_response(isert_conn->conn, cmd);
1750 }
1751
1752 static void
1753 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1754                            struct isert_cmd *isert_cmd)
1755 {
1756         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1757         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1758         struct se_cmd *se_cmd = &cmd->se_cmd;
1759         struct isert_conn *isert_conn = isert_cmd->conn;
1760         struct isert_device *device = isert_conn->conn_device;
1761         int ret = 0;
1762
1763         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1764                 ret = isert_check_pi_status(se_cmd,
1765                                             wr->fr_desc->pi_ctx->sig_mr);
1766                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1767         }
1768
1769         iscsit_stop_dataout_timer(cmd);
1770         device->unreg_rdma_mem(isert_cmd, isert_conn);
1771         cmd->write_data_done = wr->data.len;
1772         wr->send_wr_num = 0;
1773
1774         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1775         spin_lock_bh(&cmd->istate_lock);
1776         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1777         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1778         spin_unlock_bh(&cmd->istate_lock);
1779
1780         if (ret)
1781                 transport_send_check_condition_and_sense(se_cmd,
1782                                                          se_cmd->pi_err, 0);
1783         else
1784                 target_execute_cmd(se_cmd);
1785 }
1786
1787 static void
1788 isert_do_control_comp(struct work_struct *work)
1789 {
1790         struct isert_cmd *isert_cmd = container_of(work,
1791                         struct isert_cmd, comp_work);
1792         struct isert_conn *isert_conn = isert_cmd->conn;
1793         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1794         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1795
1796         switch (cmd->i_state) {
1797         case ISTATE_SEND_TASKMGTRSP:
1798                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1799
1800                 atomic_dec(&isert_conn->post_send_buf_count);
1801                 iscsit_tmr_post_handler(cmd, cmd->conn);
1802
1803                 cmd->i_state = ISTATE_SENT_STATUS;
1804                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1805                 break;
1806         case ISTATE_SEND_REJECT:
1807                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1808                 atomic_dec(&isert_conn->post_send_buf_count);
1809
1810                 cmd->i_state = ISTATE_SENT_STATUS;
1811                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1812                 break;
1813         case ISTATE_SEND_LOGOUTRSP:
1814                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1815                 /*
1816                  * Call atomic_dec(&isert_conn->post_send_buf_count)
1817                  * from isert_wait_conn()
1818                  */
1819                 isert_conn->logout_posted = true;
1820                 iscsit_logout_post_handler(cmd, cmd->conn);
1821                 break;
1822         case ISTATE_SEND_TEXTRSP:
1823                 atomic_dec(&isert_conn->post_send_buf_count);
1824                 cmd->i_state = ISTATE_SENT_STATUS;
1825                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1826                 break;
1827         default:
1828                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1829                 dump_stack();
1830                 break;
1831         }
1832 }
1833
1834 static void
1835 isert_response_completion(struct iser_tx_desc *tx_desc,
1836                           struct isert_cmd *isert_cmd,
1837                           struct isert_conn *isert_conn,
1838                           struct ib_device *ib_dev)
1839 {
1840         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1841         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1842
1843         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1844             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1845             cmd->i_state == ISTATE_SEND_REJECT ||
1846             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1847                 isert_unmap_tx_desc(tx_desc, ib_dev);
1848
1849                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1850                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1851                 return;
1852         }
1853
1854         /**
1855          * If send_wr_num is 0 this means that we got
1856          * RDMA completion and we cleared it and we should
1857          * simply decrement the response post. else the
1858          * response is incorporated in send_wr_num, just
1859          * sub it.
1860          **/
1861         if (wr->send_wr_num)
1862                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1863         else
1864                 atomic_dec(&isert_conn->post_send_buf_count);
1865
1866         cmd->i_state = ISTATE_SENT_STATUS;
1867         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1868 }
1869
1870 static void
1871 __isert_send_completion(struct iser_tx_desc *tx_desc,
1872                         struct isert_conn *isert_conn)
1873 {
1874         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1875         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1876         struct isert_rdma_wr *wr;
1877
1878         if (!isert_cmd) {
1879                 atomic_dec(&isert_conn->post_send_buf_count);
1880                 isert_unmap_tx_desc(tx_desc, ib_dev);
1881                 return;
1882         }
1883         wr = &isert_cmd->rdma_wr;
1884
1885         switch (wr->iser_ib_op) {
1886         case ISER_IB_RECV:
1887                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1888                 dump_stack();
1889                 break;
1890         case ISER_IB_SEND:
1891                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1892                 isert_response_completion(tx_desc, isert_cmd,
1893                                           isert_conn, ib_dev);
1894                 break;
1895         case ISER_IB_RDMA_WRITE:
1896                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1897                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1898                 isert_completion_rdma_write(tx_desc, isert_cmd);
1899                 break;
1900         case ISER_IB_RDMA_READ:
1901                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1902
1903                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1904                 isert_completion_rdma_read(tx_desc, isert_cmd);
1905                 break;
1906         default:
1907                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1908                 dump_stack();
1909                 break;
1910         }
1911 }
1912
1913 static void
1914 isert_send_completion(struct iser_tx_desc *tx_desc,
1915                       struct isert_conn *isert_conn)
1916 {
1917         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1918         struct iser_tx_desc *t;
1919         /*
1920          * Drain coalesced completion llist starting from comp_llnode_batch
1921          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1922          */
1923         while (llnode) {
1924                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1925                 llnode = llist_next(llnode);
1926                 __isert_send_completion(t, isert_conn);
1927         }
1928         __isert_send_completion(tx_desc, isert_conn);
1929 }
1930
1931 static void
1932 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1933 {
1934         struct llist_node *llnode;
1935         struct isert_rdma_wr *wr;
1936         struct iser_tx_desc *t;
1937
1938         mutex_lock(&isert_conn->conn_mutex);
1939         llnode = llist_del_all(&isert_conn->conn_comp_llist);
1940         isert_conn->conn_comp_batch = 0;
1941         mutex_unlock(&isert_conn->conn_mutex);
1942
1943         while (llnode) {
1944                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1945                 llnode = llist_next(llnode);
1946                 wr = &t->isert_cmd->rdma_wr;
1947
1948                 /**
1949                  * If send_wr_num is 0 this means that we got
1950                  * RDMA completion and we cleared it and we should
1951                  * simply decrement the response post. else the
1952                  * response is incorporated in send_wr_num, just
1953                  * sub it.
1954                  **/
1955                 if (wr->send_wr_num)
1956                         atomic_sub(wr->send_wr_num,
1957                                    &isert_conn->post_send_buf_count);
1958                 else
1959                         atomic_dec(&isert_conn->post_send_buf_count);
1960
1961                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1962         }
1963 }
1964
1965 static void
1966 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1967 {
1968         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1969         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1970         struct llist_node *llnode = tx_desc->comp_llnode_batch;
1971         struct isert_rdma_wr *wr;
1972         struct iser_tx_desc *t;
1973
1974         while (llnode) {
1975                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1976                 llnode = llist_next(llnode);
1977                 wr = &t->isert_cmd->rdma_wr;
1978
1979                 /**
1980                  * If send_wr_num is 0 this means that we got
1981                  * RDMA completion and we cleared it and we should
1982                  * simply decrement the response post. else the
1983                  * response is incorporated in send_wr_num, just
1984                  * sub it.
1985                  **/
1986                 if (wr->send_wr_num)
1987                         atomic_sub(wr->send_wr_num,
1988                                    &isert_conn->post_send_buf_count);
1989                 else
1990                         atomic_dec(&isert_conn->post_send_buf_count);
1991
1992                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1993         }
1994         tx_desc->comp_llnode_batch = NULL;
1995
1996         if (!isert_cmd)
1997                 isert_unmap_tx_desc(tx_desc, ib_dev);
1998         else
1999                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2000 }
2001
2002 static void
2003 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2004 {
2005         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2006         struct iscsi_conn *conn = isert_conn->conn;
2007
2008         if (isert_conn->post_recv_buf_count)
2009                 return;
2010
2011         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2012
2013         if (conn->sess) {
2014                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2015                 target_wait_for_sess_cmds(conn->sess->se_sess);
2016         }
2017
2018         while (atomic_read(&isert_conn->post_send_buf_count))
2019                 msleep(3000);
2020
2021         mutex_lock(&isert_conn->conn_mutex);
2022         isert_conn->state = ISER_CONN_DOWN;
2023         mutex_unlock(&isert_conn->conn_mutex);
2024
2025         complete(&isert_conn->conn_wait_comp_err);
2026 }
2027
2028 static void
2029 isert_cq_tx_work(struct work_struct *work)
2030 {
2031         struct isert_cq_desc *cq_desc = container_of(work,
2032                                 struct isert_cq_desc, cq_tx_work);
2033         struct isert_device *device = cq_desc->device;
2034         int cq_index = cq_desc->cq_index;
2035         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2036         struct isert_conn *isert_conn;
2037         struct iser_tx_desc *tx_desc;
2038         struct ib_wc wc;
2039
2040         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2041                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2042                 isert_conn = wc.qp->qp_context;
2043
2044                 if (wc.status == IB_WC_SUCCESS) {
2045                         isert_send_completion(tx_desc, isert_conn);
2046                 } else {
2047                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2048                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2049                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2050
2051                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2052                                 if (tx_desc->llnode_active)
2053                                         continue;
2054
2055                                 atomic_dec(&isert_conn->post_send_buf_count);
2056                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2057                         }
2058                 }
2059         }
2060
2061         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2062 }
2063
2064 static void
2065 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2066 {
2067         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2068
2069         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2070 }
2071
2072 static void
2073 isert_cq_rx_work(struct work_struct *work)
2074 {
2075         struct isert_cq_desc *cq_desc = container_of(work,
2076                         struct isert_cq_desc, cq_rx_work);
2077         struct isert_device *device = cq_desc->device;
2078         int cq_index = cq_desc->cq_index;
2079         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2080         struct isert_conn *isert_conn;
2081         struct iser_rx_desc *rx_desc;
2082         struct ib_wc wc;
2083         unsigned long xfer_len;
2084
2085         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2086                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2087                 isert_conn = wc.qp->qp_context;
2088
2089                 if (wc.status == IB_WC_SUCCESS) {
2090                         xfer_len = (unsigned long)wc.byte_len;
2091                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2092                 } else {
2093                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2094                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2095                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2096                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2097                                          wc.vendor_err);
2098                         }
2099                         isert_conn->post_recv_buf_count--;
2100                         isert_cq_rx_comp_err(isert_conn);
2101                 }
2102         }
2103
2104         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2105 }
2106
2107 static void
2108 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2109 {
2110         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2111
2112         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2113 }
2114
2115 static int
2116 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2117 {
2118         struct ib_send_wr *wr_failed;
2119         int ret;
2120
2121         atomic_inc(&isert_conn->post_send_buf_count);
2122
2123         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2124                            &wr_failed);
2125         if (ret) {
2126                 pr_err("ib_post_send failed with %d\n", ret);
2127                 atomic_dec(&isert_conn->post_send_buf_count);
2128                 return ret;
2129         }
2130         return ret;
2131 }
2132
2133 static int
2134 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2135 {
2136         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2137         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2138         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2139         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2140                                 &isert_cmd->tx_desc.iscsi_header;
2141
2142         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2143         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2144         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2145         /*
2146          * Attach SENSE DATA payload to iSCSI Response PDU
2147          */
2148         if (cmd->se_cmd.sense_buffer &&
2149             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2150             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2151                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2152                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2153                 u32 padding, pdu_len;
2154
2155                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2156                                    cmd->sense_buffer);
2157                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2158
2159                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2160                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2161                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2162
2163                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2164                                 (void *)cmd->sense_buffer, pdu_len,
2165                                 DMA_TO_DEVICE);
2166
2167                 isert_cmd->pdu_buf_len = pdu_len;
2168                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2169                 tx_dsg->length  = pdu_len;
2170                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2171                 isert_cmd->tx_desc.num_sge = 2;
2172         }
2173
2174         isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2175
2176         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2177
2178         return isert_post_response(isert_conn, isert_cmd);
2179 }
2180
2181 static void
2182 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2183 {
2184         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2185         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2186         struct isert_device *device = isert_conn->conn_device;
2187
2188         spin_lock_bh(&conn->cmd_lock);
2189         if (!list_empty(&cmd->i_conn_node))
2190                 list_del_init(&cmd->i_conn_node);
2191         spin_unlock_bh(&conn->cmd_lock);
2192
2193         if (cmd->data_direction == DMA_TO_DEVICE)
2194                 iscsit_stop_dataout_timer(cmd);
2195
2196         device->unreg_rdma_mem(isert_cmd, isert_conn);
2197 }
2198
2199 static enum target_prot_op
2200 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2201 {
2202         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2203         struct isert_device *device = isert_conn->conn_device;
2204
2205         if (device->pi_capable)
2206                 return TARGET_PROT_ALL;
2207
2208         return TARGET_PROT_NORMAL;
2209 }
2210
2211 static int
2212 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2213                 bool nopout_response)
2214 {
2215         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2216         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2217         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2218
2219         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2220         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2221                                &isert_cmd->tx_desc.iscsi_header,
2222                                nopout_response);
2223         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2224         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2225
2226         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2227
2228         return isert_post_response(isert_conn, isert_cmd);
2229 }
2230
2231 static int
2232 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2233 {
2234         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2235         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2236         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2237
2238         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2239         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2240                                 &isert_cmd->tx_desc.iscsi_header);
2241         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2242         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2243
2244         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2245
2246         return isert_post_response(isert_conn, isert_cmd);
2247 }
2248
2249 static int
2250 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2251 {
2252         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2253         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2254         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2255
2256         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2257         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2258                                   &isert_cmd->tx_desc.iscsi_header);
2259         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2260         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2261
2262         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2263
2264         return isert_post_response(isert_conn, isert_cmd);
2265 }
2266
2267 static int
2268 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2269 {
2270         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2271         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2272         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2273         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2274         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2275         struct iscsi_reject *hdr =
2276                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2277
2278         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2279         iscsit_build_reject(cmd, conn, hdr);
2280         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2281
2282         hton24(hdr->dlength, ISCSI_HDR_LEN);
2283         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2284                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2285                         DMA_TO_DEVICE);
2286         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2287         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2288         tx_dsg->length  = ISCSI_HDR_LEN;
2289         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2290         isert_cmd->tx_desc.num_sge = 2;
2291
2292         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2293
2294         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2295
2296         return isert_post_response(isert_conn, isert_cmd);
2297 }
2298
2299 static int
2300 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2301 {
2302         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2303         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2304         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2305         struct iscsi_text_rsp *hdr =
2306                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2307         u32 txt_rsp_len;
2308         int rc;
2309
2310         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2311         rc = iscsit_build_text_rsp(cmd, conn, hdr);
2312         if (rc < 0)
2313                 return rc;
2314
2315         txt_rsp_len = rc;
2316         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2317
2318         if (txt_rsp_len) {
2319                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2320                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2321                 void *txt_rsp_buf = cmd->buf_ptr;
2322
2323                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2324                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2325
2326                 isert_cmd->pdu_buf_len = txt_rsp_len;
2327                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2328                 tx_dsg->length  = txt_rsp_len;
2329                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2330                 isert_cmd->tx_desc.num_sge = 2;
2331         }
2332         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2333
2334         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2335
2336         return isert_post_response(isert_conn, isert_cmd);
2337 }
2338
2339 static int
2340 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2341                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2342                     u32 data_left, u32 offset)
2343 {
2344         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2345         struct scatterlist *sg_start, *tmp_sg;
2346         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2347         u32 sg_off, page_off;
2348         int i = 0, sg_nents;
2349
2350         sg_off = offset / PAGE_SIZE;
2351         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2352         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2353         page_off = offset % PAGE_SIZE;
2354
2355         send_wr->sg_list = ib_sge;
2356         send_wr->num_sge = sg_nents;
2357         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2358         /*
2359          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2360          */
2361         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2362                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2363                          (unsigned long long)tmp_sg->dma_address,
2364                          tmp_sg->length, page_off);
2365
2366                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2367                 ib_sge->length = min_t(u32, data_left,
2368                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2369                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2370
2371                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2372                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2373                 page_off = 0;
2374                 data_left -= ib_sge->length;
2375                 ib_sge++;
2376                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2377         }
2378
2379         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2380                  send_wr->sg_list, send_wr->num_sge);
2381
2382         return sg_nents;
2383 }
2384
2385 static int
2386 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2387                struct isert_rdma_wr *wr)
2388 {
2389         struct se_cmd *se_cmd = &cmd->se_cmd;
2390         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2391         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2392         struct isert_data_buf *data = &wr->data;
2393         struct ib_send_wr *send_wr;
2394         struct ib_sge *ib_sge;
2395         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2396         int ret = 0, i, ib_sge_cnt;
2397
2398         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2399
2400         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2401         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2402                                  se_cmd->t_data_nents, se_cmd->data_length,
2403                                  offset, wr->iser_ib_op, &wr->data);
2404         if (ret)
2405                 return ret;
2406
2407         data_left = data->len;
2408         offset = data->offset;
2409
2410         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2411         if (!ib_sge) {
2412                 pr_warn("Unable to allocate ib_sge\n");
2413                 ret = -ENOMEM;
2414                 goto unmap_cmd;
2415         }
2416         wr->ib_sge = ib_sge;
2417
2418         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2419         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2420                                 GFP_KERNEL);
2421         if (!wr->send_wr) {
2422                 pr_debug("Unable to allocate wr->send_wr\n");
2423                 ret = -ENOMEM;
2424                 goto unmap_cmd;
2425         }
2426
2427         wr->isert_cmd = isert_cmd;
2428         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2429
2430         for (i = 0; i < wr->send_wr_num; i++) {
2431                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2432                 data_len = min(data_left, rdma_write_max);
2433
2434                 send_wr->send_flags = 0;
2435                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2436                         send_wr->opcode = IB_WR_RDMA_WRITE;
2437                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2438                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2439                         if (i + 1 == wr->send_wr_num)
2440                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2441                         else
2442                                 send_wr->next = &wr->send_wr[i + 1];
2443                 } else {
2444                         send_wr->opcode = IB_WR_RDMA_READ;
2445                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2446                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2447                         if (i + 1 == wr->send_wr_num)
2448                                 send_wr->send_flags = IB_SEND_SIGNALED;
2449                         else
2450                                 send_wr->next = &wr->send_wr[i + 1];
2451                 }
2452
2453                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2454                                         send_wr, data_len, offset);
2455                 ib_sge += ib_sge_cnt;
2456
2457                 offset += data_len;
2458                 va_offset += data_len;
2459                 data_left -= data_len;
2460         }
2461
2462         return 0;
2463 unmap_cmd:
2464         isert_unmap_data_buf(isert_conn, data);
2465
2466         return ret;
2467 }
2468
2469 static int
2470 isert_map_fr_pagelist(struct ib_device *ib_dev,
2471                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2472 {
2473         u64 start_addr, end_addr, page, chunk_start = 0;
2474         struct scatterlist *tmp_sg;
2475         int i = 0, new_chunk, last_ent, n_pages;
2476
2477         n_pages = 0;
2478         new_chunk = 1;
2479         last_ent = sg_nents - 1;
2480         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2481                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2482                 if (new_chunk)
2483                         chunk_start = start_addr;
2484                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2485
2486                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2487                          i, (unsigned long long)tmp_sg->dma_address,
2488                          tmp_sg->length);
2489
2490                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2491                         new_chunk = 0;
2492                         continue;
2493                 }
2494                 new_chunk = 1;
2495
2496                 page = chunk_start & PAGE_MASK;
2497                 do {
2498                         fr_pl[n_pages++] = page;
2499                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2500                                  n_pages - 1, page);
2501                         page += PAGE_SIZE;
2502                 } while (page < end_addr);
2503         }
2504
2505         return n_pages;
2506 }
2507
2508 static int
2509 isert_fast_reg_mr(struct isert_conn *isert_conn,
2510                   struct fast_reg_descriptor *fr_desc,
2511                   struct isert_data_buf *mem,
2512                   enum isert_indicator ind,
2513                   struct ib_sge *sge)
2514 {
2515         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2516         struct ib_mr *mr;
2517         struct ib_fast_reg_page_list *frpl;
2518         struct ib_send_wr fr_wr, inv_wr;
2519         struct ib_send_wr *bad_wr, *wr = NULL;
2520         int ret, pagelist_len;
2521         u32 page_off;
2522         u8 key;
2523
2524         if (mem->dma_nents == 1) {
2525                 sge->lkey = isert_conn->conn_mr->lkey;
2526                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2527                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2528                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2529                          __func__, __LINE__, sge->addr, sge->length,
2530                          sge->lkey);
2531                 return 0;
2532         }
2533
2534         if (ind == ISERT_DATA_KEY_VALID) {
2535                 /* Registering data buffer */
2536                 mr = fr_desc->data_mr;
2537                 frpl = fr_desc->data_frpl;
2538         } else {
2539                 /* Registering protection buffer */
2540                 mr = fr_desc->pi_ctx->prot_mr;
2541                 frpl = fr_desc->pi_ctx->prot_frpl;
2542         }
2543
2544         page_off = mem->offset % PAGE_SIZE;
2545
2546         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2547                  fr_desc, mem->nents, mem->offset);
2548
2549         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2550                                              &frpl->page_list[0]);
2551
2552         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2553                 memset(&inv_wr, 0, sizeof(inv_wr));
2554                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2555                 inv_wr.opcode = IB_WR_LOCAL_INV;
2556                 inv_wr.ex.invalidate_rkey = mr->rkey;
2557                 wr = &inv_wr;
2558                 /* Bump the key */
2559                 key = (u8)(mr->rkey & 0x000000FF);
2560                 ib_update_fast_reg_key(mr, ++key);
2561         }
2562
2563         /* Prepare FASTREG WR */
2564         memset(&fr_wr, 0, sizeof(fr_wr));
2565         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2566         fr_wr.opcode = IB_WR_FAST_REG_MR;
2567         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2568         fr_wr.wr.fast_reg.page_list = frpl;
2569         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2570         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2571         fr_wr.wr.fast_reg.length = mem->len;
2572         fr_wr.wr.fast_reg.rkey = mr->rkey;
2573         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2574
2575         if (!wr)
2576                 wr = &fr_wr;
2577         else
2578                 wr->next = &fr_wr;
2579
2580         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2581         if (ret) {
2582                 pr_err("fast registration failed, ret:%d\n", ret);
2583                 return ret;
2584         }
2585         fr_desc->ind &= ~ind;
2586
2587         sge->lkey = mr->lkey;
2588         sge->addr = frpl->page_list[0] + page_off;
2589         sge->length = mem->len;
2590
2591         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2592                  __func__, __LINE__, sge->addr, sge->length,
2593                  sge->lkey);
2594
2595         return ret;
2596 }
2597
2598 static inline enum ib_t10_dif_type
2599 se2ib_prot_type(enum target_prot_type prot_type)
2600 {
2601         switch (prot_type) {
2602         case TARGET_DIF_TYPE0_PROT:
2603                 return IB_T10DIF_NONE;
2604         case TARGET_DIF_TYPE1_PROT:
2605                 return IB_T10DIF_TYPE1;
2606         case TARGET_DIF_TYPE2_PROT:
2607                 return IB_T10DIF_TYPE2;
2608         case TARGET_DIF_TYPE3_PROT:
2609                 return IB_T10DIF_TYPE3;
2610         default:
2611                 return IB_T10DIF_NONE;
2612         }
2613 }
2614
2615 static int
2616 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2617 {
2618         enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2619
2620         sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2621         sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2622         sig_attrs->mem.sig.dif.pi_interval =
2623                                 se_cmd->se_dev->dev_attrib.block_size;
2624         sig_attrs->wire.sig.dif.pi_interval =
2625                                 se_cmd->se_dev->dev_attrib.block_size;
2626
2627         switch (se_cmd->prot_op) {
2628         case TARGET_PROT_DIN_INSERT:
2629         case TARGET_PROT_DOUT_STRIP:
2630                 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2631                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2632                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2633                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2634                 break;
2635         case TARGET_PROT_DOUT_INSERT:
2636         case TARGET_PROT_DIN_STRIP:
2637                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2638                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2639                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2640                 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2641                 break;
2642         case TARGET_PROT_DIN_PASS:
2643         case TARGET_PROT_DOUT_PASS:
2644                 sig_attrs->mem.sig.dif.type = ib_prot_type;
2645                 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2646                 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2647                 sig_attrs->wire.sig.dif.type = ib_prot_type;
2648                 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2649                 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2650                 break;
2651         default:
2652                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2653                 return -EINVAL;
2654         }
2655
2656         return 0;
2657 }
2658
2659 static inline u8
2660 isert_set_prot_checks(u8 prot_checks)
2661 {
2662         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2663                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2664                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2665 }
2666
2667 static int
2668 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2669                  struct fast_reg_descriptor *fr_desc,
2670                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2671                  struct ib_sge *sig_sge)
2672 {
2673         struct ib_send_wr sig_wr, inv_wr;
2674         struct ib_send_wr *bad_wr, *wr = NULL;
2675         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2676         struct ib_sig_attrs sig_attrs;
2677         int ret;
2678         u32 key;
2679
2680         memset(&sig_attrs, 0, sizeof(sig_attrs));
2681         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2682         if (ret)
2683                 goto err;
2684
2685         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2686
2687         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2688                 memset(&inv_wr, 0, sizeof(inv_wr));
2689                 inv_wr.opcode = IB_WR_LOCAL_INV;
2690                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2691                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2692                 wr = &inv_wr;
2693                 /* Bump the key */
2694                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2695                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2696         }
2697
2698         memset(&sig_wr, 0, sizeof(sig_wr));
2699         sig_wr.opcode = IB_WR_REG_SIG_MR;
2700         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2701         sig_wr.sg_list = data_sge;
2702         sig_wr.num_sge = 1;
2703         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2704         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2705         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2706         if (se_cmd->t_prot_sg)
2707                 sig_wr.wr.sig_handover.prot = prot_sge;
2708
2709         if (!wr)
2710                 wr = &sig_wr;
2711         else
2712                 wr->next = &sig_wr;
2713
2714         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2715         if (ret) {
2716                 pr_err("fast registration failed, ret:%d\n", ret);
2717                 goto err;
2718         }
2719         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2720
2721         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2722         sig_sge->addr = 0;
2723         sig_sge->length = se_cmd->data_length;
2724         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2725             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2726                 /*
2727                  * We have protection guards on the wire
2728                  * so we need to set a larget transfer
2729                  */
2730                 sig_sge->length += se_cmd->prot_length;
2731
2732         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2733                  sig_sge->addr, sig_sge->length,
2734                  sig_sge->lkey);
2735 err:
2736         return ret;
2737 }
2738
2739 static int
2740 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2741                struct isert_rdma_wr *wr)
2742 {
2743         struct se_cmd *se_cmd = &cmd->se_cmd;
2744         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2745         struct isert_conn *isert_conn = conn->context;
2746         struct ib_sge data_sge;
2747         struct ib_send_wr *send_wr;
2748         struct fast_reg_descriptor *fr_desc = NULL;
2749         u32 offset;
2750         int ret = 0;
2751         unsigned long flags;
2752
2753         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2754
2755         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2756         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2757                                  se_cmd->t_data_nents, se_cmd->data_length,
2758                                  offset, wr->iser_ib_op, &wr->data);
2759         if (ret)
2760                 return ret;
2761
2762         if (wr->data.dma_nents != 1 ||
2763             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2764                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2765                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2766                                            struct fast_reg_descriptor, list);
2767                 list_del(&fr_desc->list);
2768                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2769                 wr->fr_desc = fr_desc;
2770         }
2771
2772         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2773                                 ISERT_DATA_KEY_VALID, &data_sge);
2774         if (ret)
2775                 goto unmap_cmd;
2776
2777         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2778                 struct ib_sge prot_sge, sig_sge;
2779
2780                 if (se_cmd->t_prot_sg) {
2781                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2782                                                  se_cmd->t_prot_sg,
2783                                                  se_cmd->t_prot_nents,
2784                                                  se_cmd->prot_length,
2785                                                  0, wr->iser_ib_op, &wr->prot);
2786                         if (ret)
2787                                 goto unmap_cmd;
2788
2789                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2790                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2791                         if (ret)
2792                                 goto unmap_prot_cmd;
2793                 }
2794
2795                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2796                                        &data_sge, &prot_sge, &sig_sge);
2797                 if (ret)
2798                         goto unmap_prot_cmd;
2799
2800                 fr_desc->ind |= ISERT_PROTECTED;
2801                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2802         } else
2803                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2804
2805         wr->ib_sge = &wr->s_ib_sge;
2806         wr->send_wr_num = 1;
2807         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2808         wr->send_wr = &wr->s_send_wr;
2809         wr->isert_cmd = isert_cmd;
2810
2811         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2812         send_wr->sg_list = &wr->s_ib_sge;
2813         send_wr->num_sge = 1;
2814         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2815         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2816                 send_wr->opcode = IB_WR_RDMA_WRITE;
2817                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2818                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2819                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2820                                       0 : IB_SEND_SIGNALED;
2821         } else {
2822                 send_wr->opcode = IB_WR_RDMA_READ;
2823                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2824                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2825                 send_wr->send_flags = IB_SEND_SIGNALED;
2826         }
2827
2828         return 0;
2829 unmap_prot_cmd:
2830         if (se_cmd->t_prot_sg)
2831                 isert_unmap_data_buf(isert_conn, &wr->prot);
2832 unmap_cmd:
2833         if (fr_desc) {
2834                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2835                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2836                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2837         }
2838         isert_unmap_data_buf(isert_conn, &wr->data);
2839
2840         return ret;
2841 }
2842
2843 static int
2844 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2845 {
2846         struct se_cmd *se_cmd = &cmd->se_cmd;
2847         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2848         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2849         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2850         struct isert_device *device = isert_conn->conn_device;
2851         struct ib_send_wr *wr_failed;
2852         int rc;
2853
2854         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2855                  isert_cmd, se_cmd->data_length);
2856         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2857         rc = device->reg_rdma_mem(conn, cmd, wr);
2858         if (rc) {
2859                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2860                 return rc;
2861         }
2862
2863         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2864                 /*
2865                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2866                  */
2867                 isert_create_send_desc(isert_conn, isert_cmd,
2868                                        &isert_cmd->tx_desc);
2869                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2870                                      &isert_cmd->tx_desc.iscsi_header);
2871                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2872                 isert_init_send_wr(isert_conn, isert_cmd,
2873                                    &isert_cmd->tx_desc.send_wr, true);
2874                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2875                 wr->send_wr_num += 1;
2876         }
2877
2878         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2879
2880         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2881         if (rc) {
2882                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2883                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2884         }
2885
2886         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2887                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2888                          "READ\n", isert_cmd);
2889         else
2890                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2891                          isert_cmd);
2892
2893         return 1;
2894 }
2895
2896 static int
2897 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2898 {
2899         struct se_cmd *se_cmd = &cmd->se_cmd;
2900         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2901         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2902         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2903         struct isert_device *device = isert_conn->conn_device;
2904         struct ib_send_wr *wr_failed;
2905         int rc;
2906
2907         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2908                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2909         wr->iser_ib_op = ISER_IB_RDMA_READ;
2910         rc = device->reg_rdma_mem(conn, cmd, wr);
2911         if (rc) {
2912                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2913                 return rc;
2914         }
2915
2916         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2917
2918         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2919         if (rc) {
2920                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2921                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2922         }
2923         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2924                  isert_cmd);
2925
2926         return 0;
2927 }
2928
2929 static int
2930 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2931 {
2932         int ret;
2933
2934         switch (state) {
2935         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2936                 ret = isert_put_nopin(cmd, conn, false);
2937                 break;
2938         default:
2939                 pr_err("Unknown immediate state: 0x%02x\n", state);
2940                 ret = -EINVAL;
2941                 break;
2942         }
2943
2944         return ret;
2945 }
2946
2947 static int
2948 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2949 {
2950         int ret;
2951
2952         switch (state) {
2953         case ISTATE_SEND_LOGOUTRSP:
2954                 ret = isert_put_logout_rsp(cmd, conn);
2955                 if (!ret) {
2956                         pr_debug("Returning iSER Logout -EAGAIN\n");
2957                         ret = -EAGAIN;
2958                 }
2959                 break;
2960         case ISTATE_SEND_NOPIN:
2961                 ret = isert_put_nopin(cmd, conn, true);
2962                 break;
2963         case ISTATE_SEND_TASKMGTRSP:
2964                 ret = isert_put_tm_rsp(cmd, conn);
2965                 break;
2966         case ISTATE_SEND_REJECT:
2967                 ret = isert_put_reject(cmd, conn);
2968                 break;
2969         case ISTATE_SEND_TEXTRSP:
2970                 ret = isert_put_text_rsp(cmd, conn);
2971                 break;
2972         case ISTATE_SEND_STATUS:
2973                 /*
2974                  * Special case for sending non GOOD SCSI status from TX thread
2975                  * context during pre se_cmd excecution failure.
2976                  */
2977                 ret = isert_put_response(conn, cmd);
2978                 break;
2979         default:
2980                 pr_err("Unknown response state: 0x%02x\n", state);
2981                 ret = -EINVAL;
2982                 break;
2983         }
2984
2985         return ret;
2986 }
2987
2988 static int
2989 isert_setup_np(struct iscsi_np *np,
2990                struct __kernel_sockaddr_storage *ksockaddr)
2991 {
2992         struct isert_np *isert_np;
2993         struct rdma_cm_id *isert_lid;
2994         struct sockaddr *sa;
2995         int ret;
2996
2997         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2998         if (!isert_np) {
2999                 pr_err("Unable to allocate struct isert_np\n");
3000                 return -ENOMEM;
3001         }
3002         init_waitqueue_head(&isert_np->np_accept_wq);
3003         mutex_init(&isert_np->np_accept_mutex);
3004         INIT_LIST_HEAD(&isert_np->np_accept_list);
3005         init_completion(&isert_np->np_login_comp);
3006
3007         sa = (struct sockaddr *)ksockaddr;
3008         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3009         /*
3010          * Setup the np->np_sockaddr from the passed sockaddr setup
3011          * in iscsi_target_configfs.c code..
3012          */
3013         memcpy(&np->np_sockaddr, ksockaddr,
3014                sizeof(struct __kernel_sockaddr_storage));
3015
3016         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3017                                 IB_QPT_RC);
3018         if (IS_ERR(isert_lid)) {
3019                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3020                        PTR_ERR(isert_lid));
3021                 ret = PTR_ERR(isert_lid);
3022                 goto out;
3023         }
3024
3025         ret = rdma_bind_addr(isert_lid, sa);
3026         if (ret) {
3027                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3028                 goto out_lid;
3029         }
3030
3031         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3032         if (ret) {
3033                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3034                 goto out_lid;
3035         }
3036
3037         isert_np->np_cm_id = isert_lid;
3038         np->np_context = isert_np;
3039         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3040
3041         return 0;
3042
3043 out_lid:
3044         rdma_destroy_id(isert_lid);
3045 out:
3046         kfree(isert_np);
3047         return ret;
3048 }
3049
3050 static int
3051 isert_check_accept_queue(struct isert_np *isert_np)
3052 {
3053         int empty;
3054
3055         mutex_lock(&isert_np->np_accept_mutex);
3056         empty = list_empty(&isert_np->np_accept_list);
3057         mutex_unlock(&isert_np->np_accept_mutex);
3058
3059         return empty;
3060 }
3061
3062 static int
3063 isert_rdma_accept(struct isert_conn *isert_conn)
3064 {
3065         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3066         struct rdma_conn_param cp;
3067         int ret;
3068
3069         memset(&cp, 0, sizeof(struct rdma_conn_param));
3070         cp.responder_resources = isert_conn->responder_resources;
3071         cp.initiator_depth = isert_conn->initiator_depth;
3072         cp.retry_count = 7;
3073         cp.rnr_retry_count = 7;
3074
3075         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3076
3077         ret = rdma_accept(cm_id, &cp);
3078         if (ret) {
3079                 pr_err("rdma_accept() failed with: %d\n", ret);
3080                 return ret;
3081         }
3082
3083         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3084
3085         return 0;
3086 }
3087
3088 static int
3089 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3090 {
3091         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3092         int ret;
3093
3094         pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3095         /*
3096          * For login requests after the first PDU, isert_rx_login_req() will
3097          * kick schedule_delayed_work(&conn->login_work) as the packet is
3098          * received, which turns this callback from iscsi_target_do_login_rx()
3099          * into a NOP.
3100          */
3101         if (!login->first_request)
3102                 return 0;
3103
3104         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3105         if (ret)
3106                 return ret;
3107
3108         pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3109         return 0;
3110 }
3111
3112 static void
3113 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3114                     struct isert_conn *isert_conn)
3115 {
3116         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3117         struct rdma_route *cm_route = &cm_id->route;
3118         struct sockaddr_in *sock_in;
3119         struct sockaddr_in6 *sock_in6;
3120
3121         conn->login_family = np->np_sockaddr.ss_family;
3122
3123         if (np->np_sockaddr.ss_family == AF_INET6) {
3124                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3125                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3126                          &sock_in6->sin6_addr.in6_u);
3127                 conn->login_port = ntohs(sock_in6->sin6_port);
3128
3129                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3130                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3131                          &sock_in6->sin6_addr.in6_u);
3132                 conn->local_port = ntohs(sock_in6->sin6_port);
3133         } else {
3134                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3135                 sprintf(conn->login_ip, "%pI4",
3136                         &sock_in->sin_addr.s_addr);
3137                 conn->login_port = ntohs(sock_in->sin_port);
3138
3139                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3140                 sprintf(conn->local_ip, "%pI4",
3141                         &sock_in->sin_addr.s_addr);
3142                 conn->local_port = ntohs(sock_in->sin_port);
3143         }
3144 }
3145
3146 static int
3147 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3148 {
3149         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3150         struct isert_conn *isert_conn;
3151         int max_accept = 0, ret;
3152
3153 accept_wait:
3154         ret = wait_event_interruptible(isert_np->np_accept_wq,
3155                         !isert_check_accept_queue(isert_np) ||
3156                         np->np_thread_state == ISCSI_NP_THREAD_RESET);
3157         if (max_accept > 5)
3158                 return -ENODEV;
3159
3160         spin_lock_bh(&np->np_thread_lock);
3161         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
3162                 spin_unlock_bh(&np->np_thread_lock);
3163                 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
3164                 return -ENODEV;
3165         }
3166         spin_unlock_bh(&np->np_thread_lock);
3167
3168         mutex_lock(&isert_np->np_accept_mutex);
3169         if (list_empty(&isert_np->np_accept_list)) {
3170                 mutex_unlock(&isert_np->np_accept_mutex);
3171                 max_accept++;
3172                 goto accept_wait;
3173         }
3174         isert_conn = list_first_entry(&isert_np->np_accept_list,
3175                         struct isert_conn, conn_accept_node);
3176         list_del_init(&isert_conn->conn_accept_node);
3177         mutex_unlock(&isert_np->np_accept_mutex);
3178
3179         conn->context = isert_conn;
3180         isert_conn->conn = conn;
3181         max_accept = 0;
3182
3183         ret = isert_rdma_post_recvl(isert_conn);
3184         if (ret)
3185                 return ret;
3186
3187         ret = isert_rdma_accept(isert_conn);
3188         if (ret)
3189                 return ret;
3190
3191         isert_set_conn_info(np, conn, isert_conn);
3192
3193         pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3194         return 0;
3195 }
3196
3197 static void
3198 isert_free_np(struct iscsi_np *np)
3199 {
3200         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3201
3202         rdma_destroy_id(isert_np->np_cm_id);
3203
3204         np->np_context = NULL;
3205         kfree(isert_np);
3206 }
3207
3208 static void isert_wait_conn(struct iscsi_conn *conn)
3209 {
3210         struct isert_conn *isert_conn = conn->context;
3211
3212         pr_debug("isert_wait_conn: Starting \n");
3213         /*
3214          * Decrement post_send_buf_count for special case when called
3215          * from isert_do_control_comp() -> iscsit_logout_post_handler()
3216          */
3217         mutex_lock(&isert_conn->conn_mutex);
3218         if (isert_conn->logout_posted)
3219                 atomic_dec(&isert_conn->post_send_buf_count);
3220
3221         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
3222                 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3223                 rdma_disconnect(isert_conn->conn_cm_id);
3224         }
3225         /*
3226          * Only wait for conn_wait_comp_err if the isert_conn made it
3227          * into full feature phase..
3228          */
3229         if (isert_conn->state == ISER_CONN_INIT) {
3230                 mutex_unlock(&isert_conn->conn_mutex);
3231                 return;
3232         }
3233         if (isert_conn->state == ISER_CONN_UP)
3234                 isert_conn->state = ISER_CONN_TERMINATING;
3235         mutex_unlock(&isert_conn->conn_mutex);
3236
3237         wait_for_completion(&isert_conn->conn_wait_comp_err);
3238
3239         wait_for_completion(&isert_conn->conn_wait);
3240 }
3241
3242 static void isert_free_conn(struct iscsi_conn *conn)
3243 {
3244         struct isert_conn *isert_conn = conn->context;
3245
3246         isert_put_conn(isert_conn);
3247 }
3248
3249 static struct iscsit_transport iser_target_transport = {
3250         .name                   = "IB/iSER",
3251         .transport_type         = ISCSI_INFINIBAND,
3252         .priv_size              = sizeof(struct isert_cmd),
3253         .owner                  = THIS_MODULE,
3254         .iscsit_setup_np        = isert_setup_np,
3255         .iscsit_accept_np       = isert_accept_np,
3256         .iscsit_free_np         = isert_free_np,
3257         .iscsit_wait_conn       = isert_wait_conn,
3258         .iscsit_free_conn       = isert_free_conn,
3259         .iscsit_get_login_rx    = isert_get_login_rx,
3260         .iscsit_put_login_tx    = isert_put_login_tx,
3261         .iscsit_immediate_queue = isert_immediate_queue,
3262         .iscsit_response_queue  = isert_response_queue,
3263         .iscsit_get_dataout     = isert_get_dataout,
3264         .iscsit_queue_data_in   = isert_put_datain,
3265         .iscsit_queue_status    = isert_put_response,
3266         .iscsit_aborted_task    = isert_aborted_task,
3267         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3268 };
3269
3270 static int __init isert_init(void)
3271 {
3272         int ret;
3273
3274         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3275         if (!isert_rx_wq) {
3276                 pr_err("Unable to allocate isert_rx_wq\n");
3277                 return -ENOMEM;
3278         }
3279
3280         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3281         if (!isert_comp_wq) {
3282                 pr_err("Unable to allocate isert_comp_wq\n");
3283                 ret = -ENOMEM;
3284                 goto destroy_rx_wq;
3285         }
3286
3287         iscsit_register_transport(&iser_target_transport);
3288         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3289         return 0;
3290
3291 destroy_rx_wq:
3292         destroy_workqueue(isert_rx_wq);
3293         return ret;
3294 }
3295
3296 static void __exit isert_exit(void)
3297 {
3298         destroy_workqueue(isert_comp_wq);
3299         destroy_workqueue(isert_rx_wq);
3300         iscsit_unregister_transport(&iser_target_transport);
3301         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3302 }
3303
3304 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3305 MODULE_VERSION("0.1");
3306 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3307 MODULE_LICENSE("GPL");
3308
3309 module_init(isert_init);
3310 module_exit(isert_exit);