drivers/infiniband/ulp/isert/ib_isert.c

   1 /*******************************************************************************
   2  * This file contains iSCSI extentions for RDMA (iSER) Verbs
   3  *
   4  * (c) Copyright 2013 Datera, Inc.
   5  *
   6  * Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ****************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/module.h>
  21 #include <linux/scatterlist.h>
  22 #include <linux/socket.h>
  23 #include <linux/in.h>
  24 #include <linux/in6.h>
  25 #include <linux/llist.h>
  26 #include <rdma/ib_verbs.h>
  27 #include <rdma/rdma_cm.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30 #include <target/iscsi/iscsi_transport.h>
  31 #include <linux/semaphore.h>
  32
  33 #include "isert_proto.h"
  34 #include "ib_isert.h"
  35
  36 #define ISERT_MAX_CONN          8
  37 #define ISER_MAX_RX_CQ_LEN      (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
  38 #define ISER_MAX_TX_CQ_LEN      (ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
  39
  40 static DEFINE_MUTEX(device_list_mutex);
  41 static LIST_HEAD(device_list);
  42 static struct workqueue_struct *isert_rx_wq;
  43 static struct workqueue_struct *isert_comp_wq;
  44
  45 static void
  46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  47 static int
  48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  49                struct isert_rdma_wr *wr);
  50 static void
  51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
  52 static int
  53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
  54                struct isert_rdma_wr *wr);
  55 static int
  56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
  57 static int
  58 isert_rdma_post_recvl(struct isert_conn *isert_conn);
  59 static int
  60 isert_rdma_accept(struct isert_conn *isert_conn);
  61
  62 static void
  63 isert_qp_event_callback(struct ib_event *e, void *context)
  64 {
  65         struct isert_conn *isert_conn = (struct isert_conn *)context;
  66
  67         pr_err("isert_qp_event_callback event: %d\n", e->event);
  68         switch (e->event) {
  69         case IB_EVENT_COMM_EST:
  70                 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
  71                 break;
  72         case IB_EVENT_QP_LAST_WQE_REACHED:
  73                 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
  74                 break;
  75         default:
  76                 break;
  77         }
  78 }
  79
  80 static int
  81 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
  82 {
  83         int ret;
  84
  85         ret = ib_query_device(ib_dev, devattr);
  86         if (ret) {
  87                 pr_err("ib_query_device() failed: %d\n", ret);
  88                 return ret;
  89         }
  90         pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
  91         pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
  92
  93         return 0;
  94 }
  95
  96 static int
  97 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
  98                     u8 protection)
  99 {
 100         struct isert_device *device = isert_conn->conn_device;
 101         struct ib_qp_init_attr attr;
 102         int ret, index, min_index = 0;
 103
 104         mutex_lock(&device_list_mutex);
 105         for (index = 0; index < device->cqs_used; index++)
 106                 if (device->cq_active_qps[index] <
 107                     device->cq_active_qps[min_index])
 108                         min_index = index;
 109         device->cq_active_qps[min_index]++;
 110         pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
 111         mutex_unlock(&device_list_mutex);
 112
 113         memset(&attr, 0, sizeof(struct ib_qp_init_attr));
 114         attr.event_handler = isert_qp_event_callback;
 115         attr.qp_context = isert_conn;
 116         attr.send_cq = device->dev_tx_cq[min_index];
 117         attr.recv_cq = device->dev_rx_cq[min_index];
 118         attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
 119         attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
 120         /*
 121          * FIXME: Use devattr.max_sge - 2 for max_send_sge as
 122          * work-around for RDMA_READs with ConnectX-2.
 123          *
 124          * Also, still make sure to have at least two SGEs for
 125          * outgoing control PDU responses.
 126          */
 127         attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
 128         isert_conn->max_sge = attr.cap.max_send_sge;
 129
 130         attr.cap.max_recv_sge = 1;
 131         attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 132         attr.qp_type = IB_QPT_RC;
 133         if (protection)
 134                 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
 135
 136         pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
 137                  cma_id->device);
 138         pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
 139                  isert_conn->conn_pd->device);
 140
 141         ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
 142         if (ret) {
 143                 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
 144                 return ret;
 145         }
 146         isert_conn->conn_qp = cma_id->qp;
 147         pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
 148
 149         return 0;
 150 }
 151
 152 static void
 153 isert_cq_event_callback(struct ib_event *e, void *context)
 154 {
 155         pr_debug("isert_cq_event_callback event: %d\n", e->event);
 156 }
 157
 158 static int
 159 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
 160 {
 161         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 162         struct iser_rx_desc *rx_desc;
 163         struct ib_sge *rx_sg;
 164         u64 dma_addr;
 165         int i, j;
 166
 167         isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
 168                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 169         if (!isert_conn->conn_rx_descs)
 170                 goto fail;
 171
 172         rx_desc = isert_conn->conn_rx_descs;
 173
 174         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 175                 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
 176                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 177                 if (ib_dma_mapping_error(ib_dev, dma_addr))
 178                         goto dma_map_fail;
 179
 180                 rx_desc->dma_addr = dma_addr;
 181
 182                 rx_sg = &rx_desc->rx_sg;
 183                 rx_sg->addr = rx_desc->dma_addr;
 184                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 185                 rx_sg->lkey = isert_conn->conn_mr->lkey;
 186         }
 187
 188         isert_conn->conn_rx_desc_head = 0;
 189         return 0;
 190
 191 dma_map_fail:
 192         rx_desc = isert_conn->conn_rx_descs;
 193         for (j = 0; j < i; j++, rx_desc++) {
 194                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 195                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 196         }
 197         kfree(isert_conn->conn_rx_descs);
 198         isert_conn->conn_rx_descs = NULL;
 199 fail:
 200         return -ENOMEM;
 201 }
 202
 203 static void
 204 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 205 {
 206         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 207         struct iser_rx_desc *rx_desc;
 208         int i;
 209
 210         if (!isert_conn->conn_rx_descs)
 211                 return;
 212
 213         rx_desc = isert_conn->conn_rx_descs;
 214         for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 215                 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
 216                                     ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 217         }
 218
 219         kfree(isert_conn->conn_rx_descs);
 220         isert_conn->conn_rx_descs = NULL;
 221 }
 222
 223 static void isert_cq_tx_work(struct work_struct *);
 224 static void isert_cq_tx_callback(struct ib_cq *, void *);
 225 static void isert_cq_rx_work(struct work_struct *);
 226 static void isert_cq_rx_callback(struct ib_cq *, void *);
 227
 228 static int
 229 isert_create_device_ib_res(struct isert_device *device)
 230 {
 231         struct ib_device *ib_dev = device->ib_device;
 232         struct isert_cq_desc *cq_desc;
 233         struct ib_device_attr *dev_attr;
 234         int ret = 0, i, j;
 235         int max_rx_cqe, max_tx_cqe;
 236
 237         dev_attr = &device->dev_attr;
 238         ret = isert_query_device(ib_dev, dev_attr);
 239         if (ret)
 240                 return ret;
 241
 242         max_rx_cqe = min(ISER_MAX_RX_CQ_LEN, dev_attr->max_cqe);
 243         max_tx_cqe = min(ISER_MAX_TX_CQ_LEN, dev_attr->max_cqe);
 244
 245         /* asign function handlers */
 246         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
 247             dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
 248                 device->use_fastreg = 1;
 249                 device->reg_rdma_mem = isert_reg_rdma;
 250                 device->unreg_rdma_mem = isert_unreg_rdma;
 251         } else {
 252                 device->use_fastreg = 0;
 253                 device->reg_rdma_mem = isert_map_rdma;
 254                 device->unreg_rdma_mem = isert_unmap_cmd;
 255         }
 256
 257         /* Check signature cap */
 258         device->pi_capable = dev_attr->device_cap_flags &
 259                              IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
 260
 261         device->cqs_used = min_t(int, num_online_cpus(),
 262                                  device->ib_device->num_comp_vectors);
 263         device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
 264         pr_debug("Using %d CQs, device %s supports %d vectors support "
 265                  "Fast registration %d pi_capable %d\n",
 266                  device->cqs_used, device->ib_device->name,
 267                  device->ib_device->num_comp_vectors, device->use_fastreg,
 268                  device->pi_capable);
 269         device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
 270                                 device->cqs_used, GFP_KERNEL);
 271         if (!device->cq_desc) {
 272                 pr_err("Unable to allocate device->cq_desc\n");
 273                 return -ENOMEM;
 274         }
 275         cq_desc = device->cq_desc;
 276
 277         for (i = 0; i < device->cqs_used; i++) {
 278                 cq_desc[i].device = device;
 279                 cq_desc[i].cq_index = i;
 280
 281                 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
 282                 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
 283                                                 isert_cq_rx_callback,
 284                                                 isert_cq_event_callback,
 285                                                 (void *)&cq_desc[i],
 286                                                 max_rx_cqe, i);
 287                 if (IS_ERR(device->dev_rx_cq[i])) {
 288                         ret = PTR_ERR(device->dev_rx_cq[i]);
 289                         device->dev_rx_cq[i] = NULL;
 290                         goto out_cq;
 291                 }
 292
 293                 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
 294                 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
 295                                                 isert_cq_tx_callback,
 296                                                 isert_cq_event_callback,
 297                                                 (void *)&cq_desc[i],
 298                                                 max_tx_cqe, i);
 299                 if (IS_ERR(device->dev_tx_cq[i])) {
 300                         ret = PTR_ERR(device->dev_tx_cq[i]);
 301                         device->dev_tx_cq[i] = NULL;
 302                         goto out_cq;
 303                 }
 304
 305                 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
 306                 if (ret)
 307                         goto out_cq;
 308
 309                 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
 310                 if (ret)
 311                         goto out_cq;
 312         }
 313
 314         return 0;
 315
 316 out_cq:
 317         for (j = 0; j < i; j++) {
 318                 cq_desc = &device->cq_desc[j];
 319
 320                 if (device->dev_rx_cq[j]) {
 321                         cancel_work_sync(&cq_desc->cq_rx_work);
 322                         ib_destroy_cq(device->dev_rx_cq[j]);
 323                 }
 324                 if (device->dev_tx_cq[j]) {
 325                         cancel_work_sync(&cq_desc->cq_tx_work);
 326                         ib_destroy_cq(device->dev_tx_cq[j]);
 327                 }
 328         }
 329         kfree(device->cq_desc);
 330
 331         return ret;
 332 }
 333
 334 static void
 335 isert_free_device_ib_res(struct isert_device *device)
 336 {
 337         struct isert_cq_desc *cq_desc;
 338         int i;
 339
 340         for (i = 0; i < device->cqs_used; i++) {
 341                 cq_desc = &device->cq_desc[i];
 342
 343                 cancel_work_sync(&cq_desc->cq_rx_work);
 344                 cancel_work_sync(&cq_desc->cq_tx_work);
 345                 ib_destroy_cq(device->dev_rx_cq[i]);
 346                 ib_destroy_cq(device->dev_tx_cq[i]);
 347                 device->dev_rx_cq[i] = NULL;
 348                 device->dev_tx_cq[i] = NULL;
 349         }
 350
 351         kfree(device->cq_desc);
 352 }
 353
 354 static void
 355 isert_device_try_release(struct isert_device *device)
 356 {
 357         mutex_lock(&device_list_mutex);
 358         device->refcount--;
 359         if (!device->refcount) {
 360                 isert_free_device_ib_res(device);
 361                 list_del(&device->dev_node);
 362                 kfree(device);
 363         }
 364         mutex_unlock(&device_list_mutex);
 365 }
 366
 367 static struct isert_device *
 368 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
 369 {
 370         struct isert_device *device;
 371         int ret;
 372
 373         mutex_lock(&device_list_mutex);
 374         list_for_each_entry(device, &device_list, dev_node) {
 375                 if (device->ib_device->node_guid == cma_id->device->node_guid) {
 376                         device->refcount++;
 377                         mutex_unlock(&device_list_mutex);
 378                         return device;
 379                 }
 380         }
 381
 382         device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
 383         if (!device) {
 384                 mutex_unlock(&device_list_mutex);
 385                 return ERR_PTR(-ENOMEM);
 386         }
 387
 388         INIT_LIST_HEAD(&device->dev_node);
 389
 390         device->ib_device = cma_id->device;
 391         ret = isert_create_device_ib_res(device);
 392         if (ret) {
 393                 kfree(device);
 394                 mutex_unlock(&device_list_mutex);
 395                 return ERR_PTR(ret);
 396         }
 397
 398         device->refcount++;
 399         list_add_tail(&device->dev_node, &device_list);
 400         mutex_unlock(&device_list_mutex);
 401
 402         return device;
 403 }
 404
 405 static void
 406 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
 407 {
 408         struct fast_reg_descriptor *fr_desc, *tmp;
 409         int i = 0;
 410
 411         if (list_empty(&isert_conn->conn_fr_pool))
 412                 return;
 413
 414         pr_debug("Freeing conn %p fastreg pool", isert_conn);
 415
 416         list_for_each_entry_safe(fr_desc, tmp,
 417                                  &isert_conn->conn_fr_pool, list) {
 418                 list_del(&fr_desc->list);
 419                 ib_free_fast_reg_page_list(fr_desc->data_frpl);
 420                 ib_dereg_mr(fr_desc->data_mr);
 421                 if (fr_desc->pi_ctx) {
 422                         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 423                         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 424                         ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
 425                         kfree(fr_desc->pi_ctx);
 426                 }
 427                 kfree(fr_desc);
 428                 ++i;
 429         }
 430
 431         if (i < isert_conn->conn_fr_pool_size)
 432                 pr_warn("Pool still has %d regions registered\n",
 433                         isert_conn->conn_fr_pool_size - i);
 434 }
 435
 436 static int
 437 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
 438                      struct fast_reg_descriptor *fr_desc, u8 protection)
 439 {
 440         int ret;
 441
 442         fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
 443                                                          ISCSI_ISER_SG_TABLESIZE);
 444         if (IS_ERR(fr_desc->data_frpl)) {
 445                 pr_err("Failed to allocate data frpl err=%ld\n",
 446                        PTR_ERR(fr_desc->data_frpl));
 447                 return PTR_ERR(fr_desc->data_frpl);
 448         }
 449
 450         fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 451         if (IS_ERR(fr_desc->data_mr)) {
 452                 pr_err("Failed to allocate data frmr err=%ld\n",
 453                        PTR_ERR(fr_desc->data_mr));
 454                 ret = PTR_ERR(fr_desc->data_mr);
 455                 goto err_data_frpl;
 456         }
 457         pr_debug("Create fr_desc %p page_list %p\n",
 458                  fr_desc, fr_desc->data_frpl->page_list);
 459         fr_desc->ind |= ISERT_DATA_KEY_VALID;
 460
 461         if (protection) {
 462                 struct ib_mr_init_attr mr_init_attr = {0};
 463                 struct pi_context *pi_ctx;
 464
 465                 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
 466                 if (!fr_desc->pi_ctx) {
 467                         pr_err("Failed to allocate pi context\n");
 468                         ret = -ENOMEM;
 469                         goto err_data_mr;
 470                 }
 471                 pi_ctx = fr_desc->pi_ctx;
 472
 473                 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
 474                                                     ISCSI_ISER_SG_TABLESIZE);
 475                 if (IS_ERR(pi_ctx->prot_frpl)) {
 476                         pr_err("Failed to allocate prot frpl err=%ld\n",
 477                                PTR_ERR(pi_ctx->prot_frpl));
 478                         ret = PTR_ERR(pi_ctx->prot_frpl);
 479                         goto err_pi_ctx;
 480                 }
 481
 482                 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
 483                 if (IS_ERR(pi_ctx->prot_mr)) {
 484                         pr_err("Failed to allocate prot frmr err=%ld\n",
 485                                PTR_ERR(pi_ctx->prot_mr));
 486                         ret = PTR_ERR(pi_ctx->prot_mr);
 487                         goto err_prot_frpl;
 488                 }
 489                 fr_desc->ind |= ISERT_PROT_KEY_VALID;
 490
 491                 mr_init_attr.max_reg_descriptors = 2;
 492                 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
 493                 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
 494                 if (IS_ERR(pi_ctx->sig_mr)) {
 495                         pr_err("Failed to allocate signature enabled mr err=%ld\n",
 496                                PTR_ERR(pi_ctx->sig_mr));
 497                         ret = PTR_ERR(pi_ctx->sig_mr);
 498                         goto err_prot_mr;
 499                 }
 500                 fr_desc->ind |= ISERT_SIG_KEY_VALID;
 501         }
 502         fr_desc->ind &= ~ISERT_PROTECTED;
 503
 504         return 0;
 505 err_prot_mr:
 506         ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
 507 err_prot_frpl:
 508         ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
 509 err_pi_ctx:
 510         kfree(fr_desc->pi_ctx);
 511 err_data_mr:
 512         ib_dereg_mr(fr_desc->data_mr);
 513 err_data_frpl:
 514         ib_free_fast_reg_page_list(fr_desc->data_frpl);
 515
 516         return ret;
 517 }
 518
 519 static int
 520 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
 521 {
 522         struct fast_reg_descriptor *fr_desc;
 523         struct isert_device *device = isert_conn->conn_device;
 524         struct se_session *se_sess = isert_conn->conn->sess->se_sess;
 525         struct se_node_acl *se_nacl = se_sess->se_node_acl;
 526         int i, ret, tag_num;
 527         /*
 528          * Setup the number of FRMRs based upon the number of tags
 529          * available to session in iscsi_target_locate_portal().
 530          */
 531         tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
 532         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
 533
 534         isert_conn->conn_fr_pool_size = 0;
 535         for (i = 0; i < tag_num; i++) {
 536                 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
 537                 if (!fr_desc) {
 538                         pr_err("Failed to allocate fast_reg descriptor\n");
 539                         ret = -ENOMEM;
 540                         goto err;
 541                 }
 542
 543                 ret = isert_create_fr_desc(device->ib_device,
 544                                            isert_conn->conn_pd, fr_desc,
 545                                            pi_support);
 546                 if (ret) {
 547                         pr_err("Failed to create fastreg descriptor err=%d\n",
 548                                ret);
 549                         kfree(fr_desc);
 550                         goto err;
 551                 }
 552
 553                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
 554                 isert_conn->conn_fr_pool_size++;
 555         }
 556
 557         pr_debug("Creating conn %p fastreg pool size=%d",
 558                  isert_conn, isert_conn->conn_fr_pool_size);
 559
 560         return 0;
 561
 562 err:
 563         isert_conn_free_fastreg_pool(isert_conn);
 564         return ret;
 565 }
 566
 567 static int
 568 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 569 {
 570         struct iscsi_np *np = cma_id->context;
 571         struct isert_np *isert_np = np->np_context;
 572         struct isert_conn *isert_conn;
 573         struct isert_device *device;
 574         struct ib_device *ib_dev = cma_id->device;
 575         int ret = 0;
 576         u8 pi_support;
 577
 578         spin_lock_bh(&np->np_thread_lock);
 579         if (!np->enabled) {
 580                 spin_unlock_bh(&np->np_thread_lock);
 581                 pr_debug("iscsi_np is not enabled, reject connect request\n");
 582                 return rdma_reject(cma_id, NULL, 0);
 583         }
 584         spin_unlock_bh(&np->np_thread_lock);
 585
 586         pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
 587                  cma_id, cma_id->context);
 588
 589         isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
 590         if (!isert_conn) {
 591                 pr_err("Unable to allocate isert_conn\n");
 592                 return -ENOMEM;
 593         }
 594         isert_conn->state = ISER_CONN_INIT;
 595         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
 596         init_completion(&isert_conn->conn_login_comp);
 597         init_completion(&isert_conn->login_req_comp);
 598         init_completion(&isert_conn->conn_wait);
 599         init_completion(&isert_conn->conn_wait_comp_err);
 600         kref_init(&isert_conn->conn_kref);
 601         mutex_init(&isert_conn->conn_mutex);
 602         spin_lock_init(&isert_conn->conn_lock);
 603         INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
 604
 605         cma_id->context = isert_conn;
 606         isert_conn->conn_cm_id = cma_id;
 607
 608         isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
 609                                         ISER_RX_LOGIN_SIZE, GFP_KERNEL);
 610         if (!isert_conn->login_buf) {
 611                 pr_err("Unable to allocate isert_conn->login_buf\n");
 612                 ret = -ENOMEM;
 613                 goto out;
 614         }
 615
 616         isert_conn->login_req_buf = isert_conn->login_buf;
 617         isert_conn->login_rsp_buf = isert_conn->login_buf +
 618                                     ISCSI_DEF_MAX_RECV_SEG_LEN;
 619         pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
 620                  isert_conn->login_buf, isert_conn->login_req_buf,
 621                  isert_conn->login_rsp_buf);
 622
 623         isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
 624                                 (void *)isert_conn->login_req_buf,
 625                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 626
 627         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
 628         if (ret) {
 629                 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
 630                        ret);
 631                 isert_conn->login_req_dma = 0;
 632                 goto out_login_buf;
 633         }
 634
 635         isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
 636                                         (void *)isert_conn->login_rsp_buf,
 637                                         ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 638
 639         ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
 640         if (ret) {
 641                 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
 642                        ret);
 643                 isert_conn->login_rsp_dma = 0;
 644                 goto out_req_dma_map;
 645         }
 646
 647         device = isert_device_find_by_ib_dev(cma_id);
 648         if (IS_ERR(device)) {
 649                 ret = PTR_ERR(device);
 650                 goto out_rsp_dma_map;
 651         }
 652
 653         /* Set max inflight RDMA READ requests */
 654         isert_conn->initiator_depth = min_t(u8,
 655                                 event->param.conn.initiator_depth,
 656                                 device->dev_attr.max_qp_init_rd_atom);
 657         pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
 658
 659         isert_conn->conn_device = device;
 660         isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
 661         if (IS_ERR(isert_conn->conn_pd)) {
 662                 ret = PTR_ERR(isert_conn->conn_pd);
 663                 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
 664                        isert_conn, ret);
 665                 goto out_pd;
 666         }
 667
 668         isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
 669                                            IB_ACCESS_LOCAL_WRITE);
 670         if (IS_ERR(isert_conn->conn_mr)) {
 671                 ret = PTR_ERR(isert_conn->conn_mr);
 672                 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
 673                        isert_conn, ret);
 674                 goto out_mr;
 675         }
 676
 677         pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
 678         if (pi_support && !device->pi_capable) {
 679                 pr_err("Protection information requested but not supported, "
 680                        "rejecting connect request\n");
 681                 ret = rdma_reject(cma_id, NULL, 0);
 682                 goto out_mr;
 683         }
 684
 685         ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
 686         if (ret)
 687                 goto out_conn_dev;
 688
 689         ret = isert_rdma_post_recvl(isert_conn);
 690         if (ret)
 691                 goto out_conn_dev;
 692
 693         ret = isert_rdma_accept(isert_conn);
 694         if (ret)
 695                 goto out_conn_dev;
 696
 697         mutex_lock(&isert_np->np_accept_mutex);
 698         list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
 699         mutex_unlock(&isert_np->np_accept_mutex);
 700
 701         pr_debug("isert_connect_request() up np_sem np: %p\n", np);
 702         up(&isert_np->np_sem);
 703         return 0;
 704
 705 out_conn_dev:
 706         ib_dereg_mr(isert_conn->conn_mr);
 707 out_mr:
 708         ib_dealloc_pd(isert_conn->conn_pd);
 709 out_pd:
 710         isert_device_try_release(device);
 711 out_rsp_dma_map:
 712         ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 713                             ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 714 out_req_dma_map:
 715         ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 716                             ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
 717 out_login_buf:
 718         kfree(isert_conn->login_buf);
 719 out:
 720         kfree(isert_conn);
 721         rdma_reject(cma_id, NULL, 0);
 722         return ret;
 723 }
 724
 725 static void
 726 isert_connect_release(struct isert_conn *isert_conn)
 727 {
 728         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 729         struct isert_device *device = isert_conn->conn_device;
 730         int cq_index;
 731
 732         pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 733
 734         if (device && device->use_fastreg)
 735                 isert_conn_free_fastreg_pool(isert_conn);
 736
 737         if (isert_conn->conn_qp) {
 738                 cq_index = ((struct isert_cq_desc *)
 739                         isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
 740                 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
 741                 isert_conn->conn_device->cq_active_qps[cq_index]--;
 742
 743                 rdma_destroy_qp(isert_conn->conn_cm_id);
 744         }
 745
 746         isert_free_rx_descriptors(isert_conn);
 747         rdma_destroy_id(isert_conn->conn_cm_id);
 748
 749         ib_dereg_mr(isert_conn->conn_mr);
 750         ib_dealloc_pd(isert_conn->conn_pd);
 751
 752         if (isert_conn->login_buf) {
 753                 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
 754                                     ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
 755                 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
 756                                     ISCSI_DEF_MAX_RECV_SEG_LEN,
 757                                     DMA_FROM_DEVICE);
 758                 kfree(isert_conn->login_buf);
 759         }
 760         kfree(isert_conn);
 761
 762         if (device)
 763                 isert_device_try_release(device);
 764
 765         pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
 766 }
 767
 768 static void
 769 isert_connected_handler(struct rdma_cm_id *cma_id)
 770 {
 771         struct isert_conn *isert_conn = cma_id->context;
 772
 773         pr_info("conn %p\n", isert_conn);
 774
 775         if (!kref_get_unless_zero(&isert_conn->conn_kref)) {
 776                 pr_warn("conn %p connect_release is running\n", isert_conn);
 777                 return;
 778         }
 779
 780         mutex_lock(&isert_conn->conn_mutex);
 781         if (isert_conn->state != ISER_CONN_FULL_FEATURE)
 782                 isert_conn->state = ISER_CONN_UP;
 783         mutex_unlock(&isert_conn->conn_mutex);
 784 }
 785
 786 static void
 787 isert_release_conn_kref(struct kref *kref)
 788 {
 789         struct isert_conn *isert_conn = container_of(kref,
 790                                 struct isert_conn, conn_kref);
 791
 792         pr_debug("Calling isert_connect_release for final kref %s/%d\n",
 793                  current->comm, current->pid);
 794
 795         isert_connect_release(isert_conn);
 796 }
 797
 798 static void
 799 isert_put_conn(struct isert_conn *isert_conn)
 800 {
 801         kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
 802 }
 803
 804 /**
 805  * isert_conn_terminate() - Initiate connection termination
 806  * @isert_conn: isert connection struct
 807  *
 808  * Notes:
 809  * In case the connection state is FULL_FEATURE, move state
 810  * to TEMINATING and start teardown sequence (rdma_disconnect).
 811  * In case the connection state is UP, complete flush as well.
 812  *
 813  * This routine must be called with conn_mutex held. Thus it is
 814  * safe to call multiple times.
 815  */
 816 static void
 817 isert_conn_terminate(struct isert_conn *isert_conn)
 818 {
 819         int err;
 820
 821         switch (isert_conn->state) {
 822         case ISER_CONN_TERMINATING:
 823                 break;
 824         case ISER_CONN_UP:
 825                 /*
 826                  * No flush completions will occur as we didn't
 827                  * get to ISER_CONN_FULL_FEATURE yet, complete
 828                  * to allow teardown progress.
 829                  */
 830                 complete(&isert_conn->conn_wait_comp_err);
 831         case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
 832                 pr_info("Terminating conn %p state %d\n",
 833                            isert_conn, isert_conn->state);
 834                 isert_conn->state = ISER_CONN_TERMINATING;
 835                 err = rdma_disconnect(isert_conn->conn_cm_id);
 836                 if (err)
 837                         pr_warn("Failed rdma_disconnect isert_conn %p\n",
 838                                    isert_conn);
 839                 break;
 840         default:
 841                 pr_warn("conn %p teminating in state %d\n",
 842                            isert_conn, isert_conn->state);
 843         }
 844 }
 845
 846 static int
 847 isert_disconnected_handler(struct rdma_cm_id *cma_id)
 848 {
 849         struct isert_conn *isert_conn;
 850
 851         if (!cma_id->qp) {
 852                 struct isert_np *isert_np = cma_id->context;
 853
 854                 isert_np->np_cm_id = NULL;
 855                 return -1;
 856         }
 857
 858         isert_conn = (struct isert_conn *)cma_id->context;
 859
 860         mutex_lock(&isert_conn->conn_mutex);
 861         isert_conn_terminate(isert_conn);
 862         mutex_unlock(&isert_conn->conn_mutex);
 863
 864         pr_info("conn %p completing conn_wait\n", isert_conn);
 865         complete(&isert_conn->conn_wait);
 866
 867         return 0;
 868 }
 869
 870 static void
 871 isert_connect_error(struct rdma_cm_id *cma_id)
 872 {
 873         struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
 874
 875         isert_put_conn(isert_conn);
 876 }
 877
 878 static int
 879 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 880 {
 881         int ret = 0;
 882
 883         pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
 884                  event->event, event->status, cma_id->context, cma_id);
 885
 886         switch (event->event) {
 887         case RDMA_CM_EVENT_CONNECT_REQUEST:
 888                 ret = isert_connect_request(cma_id, event);
 889                 if (ret)
 890                         pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
 891                                 event->event, ret);
 892                 break;
 893         case RDMA_CM_EVENT_ESTABLISHED:
 894                 isert_connected_handler(cma_id);
 895                 break;
 896         case RDMA_CM_EVENT_ADDR_CHANGE:    /* FALLTHRU */
 897         case RDMA_CM_EVENT_DISCONNECTED:   /* FALLTHRU */
 898         case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
 899         case RDMA_CM_EVENT_TIMEWAIT_EXIT:  /* FALLTHRU */
 900                 ret = isert_disconnected_handler(cma_id);
 901                 break;
 902         case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 903         case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 904         case RDMA_CM_EVENT_CONNECT_ERROR:
 905                 isert_connect_error(cma_id);
 906                 break;
 907         default:
 908                 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
 909                 break;
 910         }
 911
 912         return ret;
 913 }
 914
 915 static int
 916 isert_post_recv(struct isert_conn *isert_conn, u32 count)
 917 {
 918         struct ib_recv_wr *rx_wr, *rx_wr_failed;
 919         int i, ret;
 920         unsigned int rx_head = isert_conn->conn_rx_desc_head;
 921         struct iser_rx_desc *rx_desc;
 922
 923         for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
 924                 rx_desc         = &isert_conn->conn_rx_descs[rx_head];
 925                 rx_wr->wr_id    = (unsigned long)rx_desc;
 926                 rx_wr->sg_list  = &rx_desc->rx_sg;
 927                 rx_wr->num_sge  = 1;
 928                 rx_wr->next     = rx_wr + 1;
 929                 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
 930         }
 931
 932         rx_wr--;
 933         rx_wr->next = NULL; /* mark end of work requests list */
 934
 935         isert_conn->post_recv_buf_count += count;
 936         ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
 937                                 &rx_wr_failed);
 938         if (ret) {
 939                 pr_err("ib_post_recv() failed with ret: %d\n", ret);
 940                 isert_conn->post_recv_buf_count -= count;
 941         } else {
 942                 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
 943                 isert_conn->conn_rx_desc_head = rx_head;
 944         }
 945         return ret;
 946 }
 947
 948 static int
 949 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
 950 {
 951         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 952         struct ib_send_wr send_wr, *send_wr_failed;
 953         int ret;
 954
 955         ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
 956                                       ISER_HEADERS_LEN, DMA_TO_DEVICE);
 957
 958         send_wr.next    = NULL;
 959         send_wr.wr_id   = (unsigned long)tx_desc;
 960         send_wr.sg_list = tx_desc->tx_sg;
 961         send_wr.num_sge = tx_desc->num_sge;
 962         send_wr.opcode  = IB_WR_SEND;
 963         send_wr.send_flags = IB_SEND_SIGNALED;
 964
 965         atomic_inc(&isert_conn->post_send_buf_count);
 966
 967         ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
 968         if (ret) {
 969                 pr_err("ib_post_send() failed, ret: %d\n", ret);
 970                 atomic_dec(&isert_conn->post_send_buf_count);
 971         }
 972
 973         return ret;
 974 }
 975
 976 static void
 977 isert_create_send_desc(struct isert_conn *isert_conn,
 978                        struct isert_cmd *isert_cmd,
 979                        struct iser_tx_desc *tx_desc)
 980 {
 981         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 982
 983         ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
 984                                    ISER_HEADERS_LEN, DMA_TO_DEVICE);
 985
 986         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 987         tx_desc->iser_header.flags = ISER_VER;
 988
 989         tx_desc->num_sge = 1;
 990         tx_desc->isert_cmd = isert_cmd;
 991
 992         if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
 993                 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
 994                 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
 995         }
 996 }
 997
 998 static int
 999 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1000                    struct iser_tx_desc *tx_desc)
1001 {
1002         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1003         u64 dma_addr;
1004
1005         dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1006                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
1007         if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1008                 pr_err("ib_dma_mapping_error() failed\n");
1009                 return -ENOMEM;
1010         }
1011
1012         tx_desc->dma_addr = dma_addr;
1013         tx_desc->tx_sg[0].addr  = tx_desc->dma_addr;
1014         tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1015         tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
1016
1017         pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
1018                  " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
1019                  tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
1020
1021         return 0;
1022 }
1023
1024 static void
1025 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1026                    struct ib_send_wr *send_wr, bool coalesce)
1027 {
1028         struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1029
1030         isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1031         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
1032         send_wr->opcode = IB_WR_SEND;
1033         send_wr->sg_list = &tx_desc->tx_sg[0];
1034         send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1035         /*
1036          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
1037          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
1038          */
1039         mutex_lock(&isert_conn->conn_mutex);
1040         if (coalesce && isert_conn->state == ISER_CONN_FULL_FEATURE &&
1041             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
1042                 tx_desc->llnode_active = true;
1043                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
1044                 mutex_unlock(&isert_conn->conn_mutex);
1045                 return;
1046         }
1047         isert_conn->conn_comp_batch = 0;
1048         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
1049         mutex_unlock(&isert_conn->conn_mutex);
1050
1051         send_wr->send_flags = IB_SEND_SIGNALED;
1052 }
1053
1054 static int
1055 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1056 {
1057         struct ib_recv_wr rx_wr, *rx_wr_fail;
1058         struct ib_sge sge;
1059         int ret;
1060
1061         memset(&sge, 0, sizeof(struct ib_sge));
1062         sge.addr = isert_conn->login_req_dma;
1063         sge.length = ISER_RX_LOGIN_SIZE;
1064         sge.lkey = isert_conn->conn_mr->lkey;
1065
1066         pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1067                 sge.addr, sge.length, sge.lkey);
1068
1069         memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1070         rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1071         rx_wr.sg_list = &sge;
1072         rx_wr.num_sge = 1;
1073
1074         isert_conn->post_recv_buf_count++;
1075         ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1076         if (ret) {
1077                 pr_err("ib_post_recv() failed: %d\n", ret);
1078                 isert_conn->post_recv_buf_count--;
1079         }
1080
1081         pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1082         return ret;
1083 }
1084
1085 static int
1086 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1087                    u32 length)
1088 {
1089         struct isert_conn *isert_conn = conn->context;
1090         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1091         struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1092         int ret;
1093
1094         isert_create_send_desc(isert_conn, NULL, tx_desc);
1095
1096         memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1097                sizeof(struct iscsi_hdr));
1098
1099         isert_init_tx_hdrs(isert_conn, tx_desc);
1100
1101         if (length > 0) {
1102                 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1103
1104                 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1105                                            length, DMA_TO_DEVICE);
1106
1107                 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1108
1109                 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1110                                               length, DMA_TO_DEVICE);
1111
1112                 tx_dsg->addr    = isert_conn->login_rsp_dma;
1113                 tx_dsg->length  = length;
1114                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
1115                 tx_desc->num_sge = 2;
1116         }
1117         if (!login->login_failed) {
1118                 if (login->login_complete) {
1119                         if (!conn->sess->sess_ops->SessionType &&
1120                             isert_conn->conn_device->use_fastreg) {
1121                                 /* Normal Session and fastreg is used */
1122                                 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1123
1124                                 ret = isert_conn_create_fastreg_pool(isert_conn,
1125                                                                      pi_support);
1126                                 if (ret) {
1127                                         pr_err("Conn: %p failed to create"
1128                                                " fastreg pool\n", isert_conn);
1129                                         return ret;
1130                                 }
1131                         }
1132
1133                         ret = isert_alloc_rx_descriptors(isert_conn);
1134                         if (ret)
1135                                 return ret;
1136
1137                         ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1138                         if (ret)
1139                                 return ret;
1140
1141                         /* Now we are in FULL_FEATURE phase */
1142                         mutex_lock(&isert_conn->conn_mutex);
1143                         isert_conn->state = ISER_CONN_FULL_FEATURE;
1144                         mutex_unlock(&isert_conn->conn_mutex);
1145                         goto post_send;
1146                 }
1147
1148                 ret = isert_rdma_post_recvl(isert_conn);
1149                 if (ret)
1150                         return ret;
1151         }
1152 post_send:
1153         ret = isert_post_send(isert_conn, tx_desc);
1154         if (ret)
1155                 return ret;
1156
1157         return 0;
1158 }
1159
1160 static void
1161 isert_rx_login_req(struct isert_conn *isert_conn)
1162 {
1163         struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1164         int rx_buflen = isert_conn->login_req_len;
1165         struct iscsi_conn *conn = isert_conn->conn;
1166         struct iscsi_login *login = conn->conn_login;
1167         int size;
1168
1169         pr_info("conn %p\n", isert_conn);
1170
1171         WARN_ON_ONCE(!login);
1172
1173         if (login->first_request) {
1174                 struct iscsi_login_req *login_req =
1175                         (struct iscsi_login_req *)&rx_desc->iscsi_header;
1176                 /*
1177                  * Setup the initial iscsi_login values from the leading
1178                  * login request PDU.
1179                  */
1180                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1181                 login->current_stage =
1182                         (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1183                          >> 2;
1184                 login->version_min      = login_req->min_version;
1185                 login->version_max      = login_req->max_version;
1186                 memcpy(login->isid, login_req->isid, 6);
1187                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1188                 login->init_task_tag    = login_req->itt;
1189                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1190                 login->cid              = be16_to_cpu(login_req->cid);
1191                 login->tsih             = be16_to_cpu(login_req->tsih);
1192         }
1193
1194         memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1195
1196         size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1197         pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1198                  size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1199         memcpy(login->req_buf, &rx_desc->data[0], size);
1200
1201         if (login->first_request) {
1202                 complete(&isert_conn->conn_login_comp);
1203                 return;
1204         }
1205         schedule_delayed_work(&conn->login_work, 0);
1206 }
1207
1208 static struct iscsi_cmd
1209 *isert_allocate_cmd(struct iscsi_conn *conn)
1210 {
1211         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1212         struct isert_cmd *isert_cmd;
1213         struct iscsi_cmd *cmd;
1214
1215         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1216         if (!cmd) {
1217                 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1218                 return NULL;
1219         }
1220         isert_cmd = iscsit_priv_cmd(cmd);
1221         isert_cmd->conn = isert_conn;
1222         isert_cmd->iscsi_cmd = cmd;
1223
1224         return cmd;
1225 }
1226
1227 static int
1228 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1229                       struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1230                       struct iser_rx_desc *rx_desc, unsigned char *buf)
1231 {
1232         struct iscsi_conn *conn = isert_conn->conn;
1233         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1234         struct scatterlist *sg;
1235         int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1236         bool dump_payload = false;
1237
1238         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1239         if (rc < 0)
1240                 return rc;
1241
1242         imm_data = cmd->immediate_data;
1243         imm_data_len = cmd->first_burst_len;
1244         unsol_data = cmd->unsolicited_data;
1245
1246         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1247         if (rc < 0) {
1248                 return 0;
1249         } else if (rc > 0) {
1250                 dump_payload = true;
1251                 goto sequence_cmd;
1252         }
1253
1254         if (!imm_data)
1255                 return 0;
1256
1257         sg = &cmd->se_cmd.t_data_sg[0];
1258         sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1259
1260         pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1261                  sg, sg_nents, &rx_desc->data[0], imm_data_len);
1262
1263         sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1264
1265         cmd->write_data_done += imm_data_len;
1266
1267         if (cmd->write_data_done == cmd->se_cmd.data_length) {
1268                 spin_lock_bh(&cmd->istate_lock);
1269                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1270                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1271                 spin_unlock_bh(&cmd->istate_lock);
1272         }
1273
1274 sequence_cmd:
1275         rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1276
1277         if (!rc && dump_payload == false && unsol_data)
1278                 iscsit_set_unsoliticed_dataout(cmd);
1279         else if (dump_payload && imm_data)
1280                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1281
1282         return 0;
1283 }
1284
1285 static int
1286 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1287                            struct iser_rx_desc *rx_desc, unsigned char *buf)
1288 {
1289         struct scatterlist *sg_start;
1290         struct iscsi_conn *conn = isert_conn->conn;
1291         struct iscsi_cmd *cmd = NULL;
1292         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1293         u32 unsol_data_len = ntoh24(hdr->dlength);
1294         int rc, sg_nents, sg_off, page_off;
1295
1296         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1297         if (rc < 0)
1298                 return rc;
1299         else if (!cmd)
1300                 return 0;
1301         /*
1302          * FIXME: Unexpected unsolicited_data out
1303          */
1304         if (!cmd->unsolicited_data) {
1305                 pr_err("Received unexpected solicited data payload\n");
1306                 dump_stack();
1307                 return -1;
1308         }
1309
1310         pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1311                  unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1312
1313         sg_off = cmd->write_data_done / PAGE_SIZE;
1314         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1315         sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1316         page_off = cmd->write_data_done % PAGE_SIZE;
1317         /*
1318          * FIXME: Non page-aligned unsolicited_data out
1319          */
1320         if (page_off) {
1321                 pr_err("Received unexpected non-page aligned data payload\n");
1322                 dump_stack();
1323                 return -1;
1324         }
1325         pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1326                  sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1327
1328         sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1329                             unsol_data_len);
1330
1331         rc = iscsit_check_dataout_payload(cmd, hdr, false);
1332         if (rc < 0)
1333                 return rc;
1334
1335         return 0;
1336 }
1337
1338 static int
1339 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1340                      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1341                      unsigned char *buf)
1342 {
1343         struct iscsi_conn *conn = isert_conn->conn;
1344         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1345         int rc;
1346
1347         rc = iscsit_setup_nop_out(conn, cmd, hdr);
1348         if (rc < 0)
1349                 return rc;
1350         /*
1351          * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1352          */
1353
1354         return iscsit_process_nop_out(conn, cmd, hdr);
1355 }
1356
1357 static int
1358 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1359                       struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1360                       struct iscsi_text *hdr)
1361 {
1362         struct iscsi_conn *conn = isert_conn->conn;
1363         u32 payload_length = ntoh24(hdr->dlength);
1364         int rc;
1365         unsigned char *text_in;
1366
1367         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1368         if (rc < 0)
1369                 return rc;
1370
1371         text_in = kzalloc(payload_length, GFP_KERNEL);
1372         if (!text_in) {
1373                 pr_err("Unable to allocate text_in of payload_length: %u\n",
1374                        payload_length);
1375                 return -ENOMEM;
1376         }
1377         cmd->text_in_ptr = text_in;
1378
1379         memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1380
1381         return iscsit_process_text_cmd(conn, cmd, hdr);
1382 }
1383
1384 static int
1385 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1386                 uint32_t read_stag, uint64_t read_va,
1387                 uint32_t write_stag, uint64_t write_va)
1388 {
1389         struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1390         struct iscsi_conn *conn = isert_conn->conn;
1391         struct iscsi_session *sess = conn->sess;
1392         struct iscsi_cmd *cmd;
1393         struct isert_cmd *isert_cmd;
1394         int ret = -EINVAL;
1395         u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1396
1397         if (sess->sess_ops->SessionType &&
1398            (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1399                 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1400                        " ignoring\n", opcode);
1401                 return 0;
1402         }
1403
1404         switch (opcode) {
1405         case ISCSI_OP_SCSI_CMD:
1406                 cmd = isert_allocate_cmd(conn);
1407                 if (!cmd)
1408                         break;
1409
1410                 isert_cmd = iscsit_priv_cmd(cmd);
1411                 isert_cmd->read_stag = read_stag;
1412                 isert_cmd->read_va = read_va;
1413                 isert_cmd->write_stag = write_stag;
1414                 isert_cmd->write_va = write_va;
1415
1416                 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1417                                         rx_desc, (unsigned char *)hdr);
1418                 break;
1419         case ISCSI_OP_NOOP_OUT:
1420                 cmd = isert_allocate_cmd(conn);
1421                 if (!cmd)
1422                         break;
1423
1424                 isert_cmd = iscsit_priv_cmd(cmd);
1425                 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1426                                            rx_desc, (unsigned char *)hdr);
1427                 break;
1428         case ISCSI_OP_SCSI_DATA_OUT:
1429                 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1430                                                 (unsigned char *)hdr);
1431                 break;
1432         case ISCSI_OP_SCSI_TMFUNC:
1433                 cmd = isert_allocate_cmd(conn);
1434                 if (!cmd)
1435                         break;
1436
1437                 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1438                                                 (unsigned char *)hdr);
1439                 break;
1440         case ISCSI_OP_LOGOUT:
1441                 cmd = isert_allocate_cmd(conn);
1442                 if (!cmd)
1443                         break;
1444
1445                 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1446                 if (ret > 0)
1447                         wait_for_completion_timeout(&conn->conn_logout_comp,
1448                                                     SECONDS_FOR_LOGOUT_COMP *
1449                                                     HZ);
1450                 break;
1451         case ISCSI_OP_TEXT:
1452                 cmd = isert_allocate_cmd(conn);
1453                 if (!cmd)
1454                         break;
1455
1456                 isert_cmd = iscsit_priv_cmd(cmd);
1457                 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1458                                             rx_desc, (struct iscsi_text *)hdr);
1459                 break;
1460         default:
1461                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1462                 dump_stack();
1463                 break;
1464         }
1465
1466         return ret;
1467 }
1468
1469 static void
1470 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1471 {
1472         struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1473         uint64_t read_va = 0, write_va = 0;
1474         uint32_t read_stag = 0, write_stag = 0;
1475         int rc;
1476
1477         switch (iser_hdr->flags & 0xF0) {
1478         case ISCSI_CTRL:
1479                 if (iser_hdr->flags & ISER_RSV) {
1480                         read_stag = be32_to_cpu(iser_hdr->read_stag);
1481                         read_va = be64_to_cpu(iser_hdr->read_va);
1482                         pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1483                                  read_stag, (unsigned long long)read_va);
1484                 }
1485                 if (iser_hdr->flags & ISER_WSV) {
1486                         write_stag = be32_to_cpu(iser_hdr->write_stag);
1487                         write_va = be64_to_cpu(iser_hdr->write_va);
1488                         pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1489                                  write_stag, (unsigned long long)write_va);
1490                 }
1491
1492                 pr_debug("ISER ISCSI_CTRL PDU\n");
1493                 break;
1494         case ISER_HELLO:
1495                 pr_err("iSER Hello message\n");
1496                 break;
1497         default:
1498                 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1499                 break;
1500         }
1501
1502         rc = isert_rx_opcode(isert_conn, rx_desc,
1503                              read_stag, read_va, write_stag, write_va);
1504 }
1505
1506 static void
1507 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1508                     unsigned long xfer_len)
1509 {
1510         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1511         struct iscsi_hdr *hdr;
1512         u64 rx_dma;
1513         int rx_buflen, outstanding;
1514
1515         if ((char *)desc == isert_conn->login_req_buf) {
1516                 rx_dma = isert_conn->login_req_dma;
1517                 rx_buflen = ISER_RX_LOGIN_SIZE;
1518                 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1519                          rx_dma, rx_buflen);
1520         } else {
1521                 rx_dma = desc->dma_addr;
1522                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1523                 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1524                          rx_dma, rx_buflen);
1525         }
1526
1527         ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1528
1529         hdr = &desc->iscsi_header;
1530         pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1531                  hdr->opcode, hdr->itt, hdr->flags,
1532                  (int)(xfer_len - ISER_HEADERS_LEN));
1533
1534         if ((char *)desc == isert_conn->login_req_buf) {
1535                 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1536                 if (isert_conn->conn) {
1537                         struct iscsi_login *login = isert_conn->conn->conn_login;
1538
1539                         if (login && !login->first_request)
1540                                 isert_rx_login_req(isert_conn);
1541                 }
1542                 mutex_lock(&isert_conn->conn_mutex);
1543                 complete(&isert_conn->login_req_comp);
1544                 mutex_unlock(&isert_conn->conn_mutex);
1545         } else {
1546                 isert_rx_do_work(desc, isert_conn);
1547         }
1548
1549         ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1550                                       DMA_FROM_DEVICE);
1551
1552         isert_conn->post_recv_buf_count--;
1553         pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1554                  isert_conn->post_recv_buf_count);
1555
1556         if ((char *)desc == isert_conn->login_req_buf)
1557                 return;
1558
1559         outstanding = isert_conn->post_recv_buf_count;
1560         if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1561                 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1562                                 ISERT_MIN_POSTED_RX);
1563                 err = isert_post_recv(isert_conn, count);
1564                 if (err) {
1565                         pr_err("isert_post_recv() count: %d failed, %d\n",
1566                                count, err);
1567                 }
1568         }
1569 }
1570
1571 static int
1572 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1573                    struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1574                    enum iser_ib_op_code op, struct isert_data_buf *data)
1575 {
1576         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1577
1578         data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1579                               DMA_TO_DEVICE : DMA_FROM_DEVICE;
1580
1581         data->len = length - offset;
1582         data->offset = offset;
1583         data->sg_off = data->offset / PAGE_SIZE;
1584
1585         data->sg = &sg[data->sg_off];
1586         data->nents = min_t(unsigned int, nents - data->sg_off,
1587                                           ISCSI_ISER_SG_TABLESIZE);
1588         data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1589                                         PAGE_SIZE);
1590
1591         data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1592                                         data->dma_dir);
1593         if (unlikely(!data->dma_nents)) {
1594                 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1595                 return -EINVAL;
1596         }
1597
1598         pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1599                  isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1600
1601         return 0;
1602 }
1603
1604 static void
1605 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1606 {
1607         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1608
1609         ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1610         memset(data, 0, sizeof(*data));
1611 }
1612
1613
1614
1615 static void
1616 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1617 {
1618         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1619
1620         pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1621
1622         if (wr->data.sg) {
1623                 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1624                 isert_unmap_data_buf(isert_conn, &wr->data);
1625         }
1626
1627         if (wr->send_wr) {
1628                 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1629                 kfree(wr->send_wr);
1630                 wr->send_wr = NULL;
1631         }
1632
1633         if (wr->ib_sge) {
1634                 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1635                 kfree(wr->ib_sge);
1636                 wr->ib_sge = NULL;
1637         }
1638 }
1639
1640 static void
1641 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1642 {
1643         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1644         LIST_HEAD(unmap_list);
1645
1646         pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1647
1648         if (wr->fr_desc) {
1649                 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1650                          isert_cmd, wr->fr_desc);
1651                 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1652                         isert_unmap_data_buf(isert_conn, &wr->prot);
1653                         wr->fr_desc->ind &= ~ISERT_PROTECTED;
1654                 }
1655                 spin_lock_bh(&isert_conn->conn_lock);
1656                 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1657                 spin_unlock_bh(&isert_conn->conn_lock);
1658                 wr->fr_desc = NULL;
1659         }
1660
1661         if (wr->data.sg) {
1662                 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1663                 isert_unmap_data_buf(isert_conn, &wr->data);
1664         }
1665
1666         wr->ib_sge = NULL;
1667         wr->send_wr = NULL;
1668 }
1669
1670 static void
1671 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1672 {
1673         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1674         struct isert_conn *isert_conn = isert_cmd->conn;
1675         struct iscsi_conn *conn = isert_conn->conn;
1676         struct isert_device *device = isert_conn->conn_device;
1677
1678         pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1679
1680         switch (cmd->iscsi_opcode) {
1681         case ISCSI_OP_SCSI_CMD:
1682                 spin_lock_bh(&conn->cmd_lock);
1683                 if (!list_empty(&cmd->i_conn_node))
1684                         list_del_init(&cmd->i_conn_node);
1685                 spin_unlock_bh(&conn->cmd_lock);
1686
1687                 if (cmd->data_direction == DMA_TO_DEVICE) {
1688                         iscsit_stop_dataout_timer(cmd);
1689                         /*
1690                          * Check for special case during comp_err where
1691                          * WRITE_PENDING has been handed off from core,
1692                          * but requires an extra target_put_sess_cmd()
1693                          * before transport_generic_free_cmd() below.
1694                          */
1695                         if (comp_err &&
1696                             cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1697                                 struct se_cmd *se_cmd = &cmd->se_cmd;
1698
1699                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1700                         }
1701                 }
1702
1703                 device->unreg_rdma_mem(isert_cmd, isert_conn);
1704                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1705                 break;
1706         case ISCSI_OP_SCSI_TMFUNC:
1707                 spin_lock_bh(&conn->cmd_lock);
1708                 if (!list_empty(&cmd->i_conn_node))
1709                         list_del_init(&cmd->i_conn_node);
1710                 spin_unlock_bh(&conn->cmd_lock);
1711
1712                 transport_generic_free_cmd(&cmd->se_cmd, 0);
1713                 break;
1714         case ISCSI_OP_REJECT:
1715         case ISCSI_OP_NOOP_OUT:
1716         case ISCSI_OP_TEXT:
1717                 spin_lock_bh(&conn->cmd_lock);
1718                 if (!list_empty(&cmd->i_conn_node))
1719                         list_del_init(&cmd->i_conn_node);
1720                 spin_unlock_bh(&conn->cmd_lock);
1721
1722                 /*
1723                  * Handle special case for REJECT when iscsi_add_reject*() has
1724                  * overwritten the original iscsi_opcode assignment, and the
1725                  * associated cmd->se_cmd needs to be released.
1726                  */
1727                 if (cmd->se_cmd.se_tfo != NULL) {
1728                         pr_debug("Calling transport_generic_free_cmd from"
1729                                  " isert_put_cmd for 0x%02x\n",
1730                                  cmd->iscsi_opcode);
1731                         transport_generic_free_cmd(&cmd->se_cmd, 0);
1732                         break;
1733                 }
1734                 /*
1735                  * Fall-through
1736                  */
1737         default:
1738                 iscsit_release_cmd(cmd);
1739                 break;
1740         }
1741 }
1742
1743 static void
1744 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1745 {
1746         if (tx_desc->dma_addr != 0) {
1747                 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1748                 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1749                                     ISER_HEADERS_LEN, DMA_TO_DEVICE);
1750                 tx_desc->dma_addr = 0;
1751         }
1752 }
1753
1754 static void
1755 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1756                      struct ib_device *ib_dev, bool comp_err)
1757 {
1758         if (isert_cmd->pdu_buf_dma != 0) {
1759                 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1760                 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1761                                     isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1762                 isert_cmd->pdu_buf_dma = 0;
1763         }
1764
1765         isert_unmap_tx_desc(tx_desc, ib_dev);
1766         isert_put_cmd(isert_cmd, comp_err);
1767 }
1768
1769 static int
1770 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1771 {
1772         struct ib_mr_status mr_status;
1773         int ret;
1774
1775         ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1776         if (ret) {
1777                 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1778                 goto fail_mr_status;
1779         }
1780
1781         if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1782                 u64 sec_offset_err;
1783                 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1784
1785                 switch (mr_status.sig_err.err_type) {
1786                 case IB_SIG_BAD_GUARD:
1787                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1788                         break;
1789                 case IB_SIG_BAD_REFTAG:
1790                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1791                         break;
1792                 case IB_SIG_BAD_APPTAG:
1793                         se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1794                         break;
1795                 }
1796                 sec_offset_err = mr_status.sig_err.sig_err_offset;
1797                 do_div(sec_offset_err, block_size);
1798                 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1799
1800                 pr_err("isert: PI error found type %d at sector 0x%llx "
1801                        "expected 0x%x vs actual 0x%x\n",
1802                        mr_status.sig_err.err_type,
1803                        (unsigned long long)se_cmd->bad_sector,
1804                        mr_status.sig_err.expected,
1805                        mr_status.sig_err.actual);
1806                 ret = 1;
1807         }
1808
1809 fail_mr_status:
1810         return ret;
1811 }
1812
1813 static void
1814 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1815                             struct isert_cmd *isert_cmd)
1816 {
1817         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1818         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1819         struct se_cmd *se_cmd = &cmd->se_cmd;
1820         struct isert_conn *isert_conn = isert_cmd->conn;
1821         struct isert_device *device = isert_conn->conn_device;
1822         int ret = 0;
1823
1824         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1825                 ret = isert_check_pi_status(se_cmd,
1826                                             wr->fr_desc->pi_ctx->sig_mr);
1827                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1828         }
1829
1830         device->unreg_rdma_mem(isert_cmd, isert_conn);
1831         wr->send_wr_num = 0;
1832         if (ret)
1833                 transport_send_check_condition_and_sense(se_cmd,
1834                                                          se_cmd->pi_err, 0);
1835         else
1836                 isert_put_response(isert_conn->conn, cmd);
1837 }
1838
1839 static void
1840 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1841                            struct isert_cmd *isert_cmd)
1842 {
1843         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1844         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1845         struct se_cmd *se_cmd = &cmd->se_cmd;
1846         struct isert_conn *isert_conn = isert_cmd->conn;
1847         struct isert_device *device = isert_conn->conn_device;
1848         int ret = 0;
1849
1850         if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1851                 ret = isert_check_pi_status(se_cmd,
1852                                             wr->fr_desc->pi_ctx->sig_mr);
1853                 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1854         }
1855
1856         iscsit_stop_dataout_timer(cmd);
1857         device->unreg_rdma_mem(isert_cmd, isert_conn);
1858         cmd->write_data_done = wr->data.len;
1859         wr->send_wr_num = 0;
1860
1861         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1862         spin_lock_bh(&cmd->istate_lock);
1863         cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1864         cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1865         spin_unlock_bh(&cmd->istate_lock);
1866
1867         if (ret)
1868                 transport_send_check_condition_and_sense(se_cmd,
1869                                                          se_cmd->pi_err, 0);
1870         else
1871                 target_execute_cmd(se_cmd);
1872 }
1873
1874 static void
1875 isert_do_control_comp(struct work_struct *work)
1876 {
1877         struct isert_cmd *isert_cmd = container_of(work,
1878                         struct isert_cmd, comp_work);
1879         struct isert_conn *isert_conn = isert_cmd->conn;
1880         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1881         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1882
1883         switch (cmd->i_state) {
1884         case ISTATE_SEND_TASKMGTRSP:
1885                 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1886
1887                 atomic_dec(&isert_conn->post_send_buf_count);
1888                 iscsit_tmr_post_handler(cmd, cmd->conn);
1889
1890                 cmd->i_state = ISTATE_SENT_STATUS;
1891                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1892                 break;
1893         case ISTATE_SEND_REJECT:
1894                 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1895                 atomic_dec(&isert_conn->post_send_buf_count);
1896
1897                 cmd->i_state = ISTATE_SENT_STATUS;
1898                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1899                 break;
1900         case ISTATE_SEND_LOGOUTRSP:
1901                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1902
1903                 atomic_dec(&isert_conn->post_send_buf_count);
1904                 iscsit_logout_post_handler(cmd, cmd->conn);
1905                 break;
1906         case ISTATE_SEND_TEXTRSP:
1907                 atomic_dec(&isert_conn->post_send_buf_count);
1908                 cmd->i_state = ISTATE_SENT_STATUS;
1909                 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1910                 break;
1911         default:
1912                 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1913                 dump_stack();
1914                 break;
1915         }
1916 }
1917
1918 static void
1919 isert_response_completion(struct iser_tx_desc *tx_desc,
1920                           struct isert_cmd *isert_cmd,
1921                           struct isert_conn *isert_conn,
1922                           struct ib_device *ib_dev)
1923 {
1924         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1925         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1926
1927         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1928             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1929             cmd->i_state == ISTATE_SEND_REJECT ||
1930             cmd->i_state == ISTATE_SEND_TEXTRSP) {
1931                 isert_unmap_tx_desc(tx_desc, ib_dev);
1932
1933                 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1934                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1935                 return;
1936         }
1937
1938         /**
1939          * If send_wr_num is 0 this means that we got
1940          * RDMA completion and we cleared it and we should
1941          * simply decrement the response post. else the
1942          * response is incorporated in send_wr_num, just
1943          * sub it.
1944          **/
1945         if (wr->send_wr_num)
1946                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1947         else
1948                 atomic_dec(&isert_conn->post_send_buf_count);
1949
1950         cmd->i_state = ISTATE_SENT_STATUS;
1951         isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1952 }
1953
1954 static void
1955 __isert_send_completion(struct iser_tx_desc *tx_desc,
1956                         struct isert_conn *isert_conn)
1957 {
1958         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1959         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1960         struct isert_rdma_wr *wr;
1961
1962         if (!isert_cmd) {
1963                 atomic_dec(&isert_conn->post_send_buf_count);
1964                 isert_unmap_tx_desc(tx_desc, ib_dev);
1965                 return;
1966         }
1967         wr = &isert_cmd->rdma_wr;
1968
1969         switch (wr->iser_ib_op) {
1970         case ISER_IB_RECV:
1971                 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1972                 dump_stack();
1973                 break;
1974         case ISER_IB_SEND:
1975                 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1976                 isert_response_completion(tx_desc, isert_cmd,
1977                                           isert_conn, ib_dev);
1978                 break;
1979         case ISER_IB_RDMA_WRITE:
1980                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1981                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1982                 isert_completion_rdma_write(tx_desc, isert_cmd);
1983                 break;
1984         case ISER_IB_RDMA_READ:
1985                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1986
1987                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1988                 isert_completion_rdma_read(tx_desc, isert_cmd);
1989                 break;
1990         default:
1991                 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1992                 dump_stack();
1993                 break;
1994         }
1995 }
1996
1997 static void
1998 isert_send_completion(struct iser_tx_desc *tx_desc,
1999                       struct isert_conn *isert_conn)
2000 {
2001         struct llist_node *llnode = tx_desc->comp_llnode_batch;
2002         struct iser_tx_desc *t;
2003         /*
2004          * Drain coalesced completion llist starting from comp_llnode_batch
2005          * setup in isert_init_send_wr(), and then complete trailing tx_desc.
2006          */
2007         while (llnode) {
2008                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2009                 llnode = llist_next(llnode);
2010                 __isert_send_completion(t, isert_conn);
2011         }
2012         __isert_send_completion(tx_desc, isert_conn);
2013 }
2014
2015 static void
2016 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
2017 {
2018         struct llist_node *llnode;
2019         struct isert_rdma_wr *wr;
2020         struct iser_tx_desc *t;
2021
2022         mutex_lock(&isert_conn->conn_mutex);
2023         llnode = llist_del_all(&isert_conn->conn_comp_llist);
2024         isert_conn->conn_comp_batch = 0;
2025         mutex_unlock(&isert_conn->conn_mutex);
2026
2027         while (llnode) {
2028                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2029                 llnode = llist_next(llnode);
2030                 wr = &t->isert_cmd->rdma_wr;
2031
2032                 /**
2033                  * If send_wr_num is 0 this means that we got
2034                  * RDMA completion and we cleared it and we should
2035                  * simply decrement the response post. else the
2036                  * response is incorporated in send_wr_num, just
2037                  * sub it.
2038                  **/
2039                 if (wr->send_wr_num)
2040                         atomic_sub(wr->send_wr_num,
2041                                    &isert_conn->post_send_buf_count);
2042                 else
2043                         atomic_dec(&isert_conn->post_send_buf_count);
2044
2045                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2046         }
2047 }
2048
2049 static void
2050 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
2051 {
2052         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2053         struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2054         struct llist_node *llnode = tx_desc->comp_llnode_batch;
2055         struct isert_rdma_wr *wr;
2056         struct iser_tx_desc *t;
2057
2058         while (llnode) {
2059                 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2060                 llnode = llist_next(llnode);
2061                 wr = &t->isert_cmd->rdma_wr;
2062
2063                 /**
2064                  * If send_wr_num is 0 this means that we got
2065                  * RDMA completion and we cleared it and we should
2066                  * simply decrement the response post. else the
2067                  * response is incorporated in send_wr_num, just
2068                  * sub it.
2069                  **/
2070                 if (wr->send_wr_num)
2071                         atomic_sub(wr->send_wr_num,
2072                                    &isert_conn->post_send_buf_count);
2073                 else
2074                         atomic_dec(&isert_conn->post_send_buf_count);
2075
2076                 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2077         }
2078         tx_desc->comp_llnode_batch = NULL;
2079
2080         if (!isert_cmd)
2081                 isert_unmap_tx_desc(tx_desc, ib_dev);
2082         else
2083                 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2084 }
2085
2086 static void
2087 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2088 {
2089         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2090         struct iscsi_conn *conn = isert_conn->conn;
2091
2092         if (isert_conn->post_recv_buf_count)
2093                 return;
2094
2095         isert_cq_drain_comp_llist(isert_conn, ib_dev);
2096
2097         if (conn->sess) {
2098                 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2099                 target_wait_for_sess_cmds(conn->sess->se_sess);
2100         }
2101
2102         while (atomic_read(&isert_conn->post_send_buf_count))
2103                 msleep(3000);
2104
2105         mutex_lock(&isert_conn->conn_mutex);
2106         isert_conn_terminate(isert_conn);
2107         mutex_unlock(&isert_conn->conn_mutex);
2108
2109         iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2110
2111         complete(&isert_conn->conn_wait_comp_err);
2112 }
2113
2114 static void
2115 isert_cq_tx_work(struct work_struct *work)
2116 {
2117         struct isert_cq_desc *cq_desc = container_of(work,
2118                                 struct isert_cq_desc, cq_tx_work);
2119         struct isert_device *device = cq_desc->device;
2120         int cq_index = cq_desc->cq_index;
2121         struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2122         struct isert_conn *isert_conn;
2123         struct iser_tx_desc *tx_desc;
2124         struct ib_wc wc;
2125
2126         while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2127                 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2128                 isert_conn = wc.qp->qp_context;
2129
2130                 if (wc.status == IB_WC_SUCCESS) {
2131                         isert_send_completion(tx_desc, isert_conn);
2132                 } else {
2133                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2134                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
2135                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2136
2137                         if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2138                                 if (tx_desc->llnode_active)
2139                                         continue;
2140
2141                                 atomic_dec(&isert_conn->post_send_buf_count);
2142                                 isert_cq_tx_comp_err(tx_desc, isert_conn);
2143                         }
2144                 }
2145         }
2146
2147         ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2148 }
2149
2150 static void
2151 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2152 {
2153         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2154
2155         queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2156 }
2157
2158 static void
2159 isert_cq_rx_work(struct work_struct *work)
2160 {
2161         struct isert_cq_desc *cq_desc = container_of(work,
2162                         struct isert_cq_desc, cq_rx_work);
2163         struct isert_device *device = cq_desc->device;
2164         int cq_index = cq_desc->cq_index;
2165         struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2166         struct isert_conn *isert_conn;
2167         struct iser_rx_desc *rx_desc;
2168         struct ib_wc wc;
2169         unsigned long xfer_len;
2170
2171         while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2172                 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2173                 isert_conn = wc.qp->qp_context;
2174
2175                 if (wc.status == IB_WC_SUCCESS) {
2176                         xfer_len = (unsigned long)wc.byte_len;
2177                         isert_rx_completion(rx_desc, isert_conn, xfer_len);
2178                 } else {
2179                         pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2180                         if (wc.status != IB_WC_WR_FLUSH_ERR) {
2181                                 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2182                                 pr_debug("RX wc.vendor_err: 0x%08x\n",
2183                                          wc.vendor_err);
2184                         }
2185                         isert_conn->post_recv_buf_count--;
2186                         isert_cq_rx_comp_err(isert_conn);
2187                 }
2188         }
2189
2190         ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2191 }
2192
2193 static void
2194 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2195 {
2196         struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2197
2198         queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2199 }
2200
2201 static int
2202 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2203 {
2204         struct ib_send_wr *wr_failed;
2205         int ret;
2206
2207         atomic_inc(&isert_conn->post_send_buf_count);
2208
2209         ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2210                            &wr_failed);
2211         if (ret) {
2212                 pr_err("ib_post_send failed with %d\n", ret);
2213                 atomic_dec(&isert_conn->post_send_buf_count);
2214                 return ret;
2215         }
2216         return ret;
2217 }
2218
2219 static int
2220 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2221 {
2222         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2223         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2224         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2225         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2226                                 &isert_cmd->tx_desc.iscsi_header;
2227
2228         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2229         iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2230         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2231         /*
2232          * Attach SENSE DATA payload to iSCSI Response PDU
2233          */
2234         if (cmd->se_cmd.sense_buffer &&
2235             ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2236             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2237                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2238                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2239                 u32 padding, pdu_len;
2240
2241                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2242                                    cmd->sense_buffer);
2243                 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2244
2245                 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2246                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2247                 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2248
2249                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2250                                 (void *)cmd->sense_buffer, pdu_len,
2251                                 DMA_TO_DEVICE);
2252
2253                 isert_cmd->pdu_buf_len = pdu_len;
2254                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2255                 tx_dsg->length  = pdu_len;
2256                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2257                 isert_cmd->tx_desc.num_sge = 2;
2258         }
2259
2260         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2261
2262         pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2263
2264         return isert_post_response(isert_conn, isert_cmd);
2265 }
2266
2267 static void
2268 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2269 {
2270         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2271         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2272         struct isert_device *device = isert_conn->conn_device;
2273
2274         spin_lock_bh(&conn->cmd_lock);
2275         if (!list_empty(&cmd->i_conn_node))
2276                 list_del_init(&cmd->i_conn_node);
2277         spin_unlock_bh(&conn->cmd_lock);
2278
2279         if (cmd->data_direction == DMA_TO_DEVICE)
2280                 iscsit_stop_dataout_timer(cmd);
2281
2282         device->unreg_rdma_mem(isert_cmd, isert_conn);
2283 }
2284
2285 static enum target_prot_op
2286 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2287 {
2288         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2289         struct isert_device *device = isert_conn->conn_device;
2290
2291         if (device->pi_capable)
2292                 return TARGET_PROT_ALL;
2293
2294         return TARGET_PROT_NORMAL;
2295 }
2296
2297 static int
2298 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2299                 bool nopout_response)
2300 {
2301         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2302         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2303         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2304
2305         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2306         iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2307                                &isert_cmd->tx_desc.iscsi_header,
2308                                nopout_response);
2309         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2310         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2311
2312         pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2313
2314         return isert_post_response(isert_conn, isert_cmd);
2315 }
2316
2317 static int
2318 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2319 {
2320         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2321         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2322         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2323
2324         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2325         iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2326                                 &isert_cmd->tx_desc.iscsi_header);
2327         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2328         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2329
2330         pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2331
2332         return isert_post_response(isert_conn, isert_cmd);
2333 }
2334
2335 static int
2336 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2337 {
2338         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2339         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2340         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2341
2342         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2343         iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2344                                   &isert_cmd->tx_desc.iscsi_header);
2345         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2346         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2347
2348         pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2349
2350         return isert_post_response(isert_conn, isert_cmd);
2351 }
2352
2353 static int
2354 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2355 {
2356         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2357         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2358         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2359         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2360         struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2361         struct iscsi_reject *hdr =
2362                 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2363
2364         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2365         iscsit_build_reject(cmd, conn, hdr);
2366         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2367
2368         hton24(hdr->dlength, ISCSI_HDR_LEN);
2369         isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2370                         (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2371                         DMA_TO_DEVICE);
2372         isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2373         tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2374         tx_dsg->length  = ISCSI_HDR_LEN;
2375         tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2376         isert_cmd->tx_desc.num_sge = 2;
2377
2378         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2379
2380         pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2381
2382         return isert_post_response(isert_conn, isert_cmd);
2383 }
2384
2385 static int
2386 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2387 {
2388         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2389         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2390         struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2391         struct iscsi_text_rsp *hdr =
2392                 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2393         u32 txt_rsp_len;
2394         int rc;
2395
2396         isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2397         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2398         if (rc < 0)
2399                 return rc;
2400
2401         txt_rsp_len = rc;
2402         isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2403
2404         if (txt_rsp_len) {
2405                 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2406                 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2407                 void *txt_rsp_buf = cmd->buf_ptr;
2408
2409                 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2410                                 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2411
2412                 isert_cmd->pdu_buf_len = txt_rsp_len;
2413                 tx_dsg->addr    = isert_cmd->pdu_buf_dma;
2414                 tx_dsg->length  = txt_rsp_len;
2415                 tx_dsg->lkey    = isert_conn->conn_mr->lkey;
2416                 isert_cmd->tx_desc.num_sge = 2;
2417         }
2418         isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2419
2420         pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2421
2422         return isert_post_response(isert_conn, isert_cmd);
2423 }
2424
2425 static int
2426 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2427                     struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2428                     u32 data_left, u32 offset)
2429 {
2430         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2431         struct scatterlist *sg_start, *tmp_sg;
2432         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2433         u32 sg_off, page_off;
2434         int i = 0, sg_nents;
2435
2436         sg_off = offset / PAGE_SIZE;
2437         sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2438         sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2439         page_off = offset % PAGE_SIZE;
2440
2441         send_wr->sg_list = ib_sge;
2442         send_wr->num_sge = sg_nents;
2443         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2444         /*
2445          * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2446          */
2447         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2448                 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2449                          (unsigned long long)tmp_sg->dma_address,
2450                          tmp_sg->length, page_off);
2451
2452                 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2453                 ib_sge->length = min_t(u32, data_left,
2454                                 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2455                 ib_sge->lkey = isert_conn->conn_mr->lkey;
2456
2457                 pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u lkey: %08x\n",
2458                          ib_sge->addr, ib_sge->length, ib_sge->lkey);
2459                 page_off = 0;
2460                 data_left -= ib_sge->length;
2461                 ib_sge++;
2462                 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2463         }
2464
2465         pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2466                  send_wr->sg_list, send_wr->num_sge);
2467
2468         return sg_nents;
2469 }
2470
2471 static int
2472 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2473                struct isert_rdma_wr *wr)
2474 {
2475         struct se_cmd *se_cmd = &cmd->se_cmd;
2476         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2477         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2478         struct isert_data_buf *data = &wr->data;
2479         struct ib_send_wr *send_wr;
2480         struct ib_sge *ib_sge;
2481         u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2482         int ret = 0, i, ib_sge_cnt;
2483
2484         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2485
2486         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2487         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2488                                  se_cmd->t_data_nents, se_cmd->data_length,
2489                                  offset, wr->iser_ib_op, &wr->data);
2490         if (ret)
2491                 return ret;
2492
2493         data_left = data->len;
2494         offset = data->offset;
2495
2496         ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2497         if (!ib_sge) {
2498                 pr_warn("Unable to allocate ib_sge\n");
2499                 ret = -ENOMEM;
2500                 goto unmap_cmd;
2501         }
2502         wr->ib_sge = ib_sge;
2503
2504         wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2505         wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2506                                 GFP_KERNEL);
2507         if (!wr->send_wr) {
2508                 pr_debug("Unable to allocate wr->send_wr\n");
2509                 ret = -ENOMEM;
2510                 goto unmap_cmd;
2511         }
2512
2513         wr->isert_cmd = isert_cmd;
2514         rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2515
2516         for (i = 0; i < wr->send_wr_num; i++) {
2517                 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2518                 data_len = min(data_left, rdma_write_max);
2519
2520                 send_wr->send_flags = 0;
2521                 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2522                         send_wr->opcode = IB_WR_RDMA_WRITE;
2523                         send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2524                         send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2525                         if (i + 1 == wr->send_wr_num)
2526                                 send_wr->next = &isert_cmd->tx_desc.send_wr;
2527                         else
2528                                 send_wr->next = &wr->send_wr[i + 1];
2529                 } else {
2530                         send_wr->opcode = IB_WR_RDMA_READ;
2531                         send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2532                         send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2533                         if (i + 1 == wr->send_wr_num)
2534                                 send_wr->send_flags = IB_SEND_SIGNALED;
2535                         else
2536                                 send_wr->next = &wr->send_wr[i + 1];
2537                 }
2538
2539                 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2540                                         send_wr, data_len, offset);
2541                 ib_sge += ib_sge_cnt;
2542
2543                 offset += data_len;
2544                 va_offset += data_len;
2545                 data_left -= data_len;
2546         }
2547
2548         return 0;
2549 unmap_cmd:
2550         isert_unmap_data_buf(isert_conn, data);
2551
2552         return ret;
2553 }
2554
2555 static int
2556 isert_map_fr_pagelist(struct ib_device *ib_dev,
2557                       struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2558 {
2559         u64 start_addr, end_addr, page, chunk_start = 0;
2560         struct scatterlist *tmp_sg;
2561         int i = 0, new_chunk, last_ent, n_pages;
2562
2563         n_pages = 0;
2564         new_chunk = 1;
2565         last_ent = sg_nents - 1;
2566         for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2567                 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2568                 if (new_chunk)
2569                         chunk_start = start_addr;
2570                 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2571
2572                 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2573                          i, (unsigned long long)tmp_sg->dma_address,
2574                          tmp_sg->length);
2575
2576                 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2577                         new_chunk = 0;
2578                         continue;
2579                 }
2580                 new_chunk = 1;
2581
2582                 page = chunk_start & PAGE_MASK;
2583                 do {
2584                         fr_pl[n_pages++] = page;
2585                         pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2586                                  n_pages - 1, page);
2587                         page += PAGE_SIZE;
2588                 } while (page < end_addr);
2589         }
2590
2591         return n_pages;
2592 }
2593
2594 static int
2595 isert_fast_reg_mr(struct isert_conn *isert_conn,
2596                   struct fast_reg_descriptor *fr_desc,
2597                   struct isert_data_buf *mem,
2598                   enum isert_indicator ind,
2599                   struct ib_sge *sge)
2600 {
2601         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2602         struct ib_mr *mr;
2603         struct ib_fast_reg_page_list *frpl;
2604         struct ib_send_wr fr_wr, inv_wr;
2605         struct ib_send_wr *bad_wr, *wr = NULL;
2606         int ret, pagelist_len;
2607         u32 page_off;
2608         u8 key;
2609
2610         if (mem->dma_nents == 1) {
2611                 sge->lkey = isert_conn->conn_mr->lkey;
2612                 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2613                 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2614                 pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2615                          __func__, __LINE__, sge->addr, sge->length,
2616                          sge->lkey);
2617                 return 0;
2618         }
2619
2620         if (ind == ISERT_DATA_KEY_VALID) {
2621                 /* Registering data buffer */
2622                 mr = fr_desc->data_mr;
2623                 frpl = fr_desc->data_frpl;
2624         } else {
2625                 /* Registering protection buffer */
2626                 mr = fr_desc->pi_ctx->prot_mr;
2627                 frpl = fr_desc->pi_ctx->prot_frpl;
2628         }
2629
2630         page_off = mem->offset % PAGE_SIZE;
2631
2632         pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2633                  fr_desc, mem->nents, mem->offset);
2634
2635         pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2636                                              &frpl->page_list[0]);
2637
2638         if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2639                 memset(&inv_wr, 0, sizeof(inv_wr));
2640                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2641                 inv_wr.opcode = IB_WR_LOCAL_INV;
2642                 inv_wr.ex.invalidate_rkey = mr->rkey;
2643                 wr = &inv_wr;
2644                 /* Bump the key */
2645                 key = (u8)(mr->rkey & 0x000000FF);
2646                 ib_update_fast_reg_key(mr, ++key);
2647         }
2648
2649         /* Prepare FASTREG WR */
2650         memset(&fr_wr, 0, sizeof(fr_wr));
2651         fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2652         fr_wr.opcode = IB_WR_FAST_REG_MR;
2653         fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2654         fr_wr.wr.fast_reg.page_list = frpl;
2655         fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2656         fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2657         fr_wr.wr.fast_reg.length = mem->len;
2658         fr_wr.wr.fast_reg.rkey = mr->rkey;
2659         fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2660
2661         if (!wr)
2662                 wr = &fr_wr;
2663         else
2664                 wr->next = &fr_wr;
2665
2666         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2667         if (ret) {
2668                 pr_err("fast registration failed, ret:%d\n", ret);
2669                 return ret;
2670         }
2671         fr_desc->ind &= ~ind;
2672
2673         sge->lkey = mr->lkey;
2674         sge->addr = frpl->page_list[0] + page_off;
2675         sge->length = mem->len;
2676
2677         pr_debug("%s:%d sge: addr: 0x%llx  length: %u lkey: %x\n",
2678                  __func__, __LINE__, sge->addr, sge->length,
2679                  sge->lkey);
2680
2681         return ret;
2682 }
2683
2684 static inline void
2685 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2686                      struct ib_sig_domain *domain)
2687 {
2688         domain->sig_type = IB_SIG_TYPE_T10_DIF;
2689         domain->sig.dif.bg_type = IB_T10DIF_CRC;
2690         domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2691         domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2692         /*
2693          * At the moment we hard code those, but if in the future
2694          * the target core would like to use it, we will take it
2695          * from se_cmd.
2696          */
2697         domain->sig.dif.apptag_check_mask = 0xffff;
2698         domain->sig.dif.app_escape = true;
2699         domain->sig.dif.ref_escape = true;
2700         if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2701             se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2702                 domain->sig.dif.ref_remap = true;
2703 };
2704
2705 static int
2706 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2707 {
2708         switch (se_cmd->prot_op) {
2709         case TARGET_PROT_DIN_INSERT:
2710         case TARGET_PROT_DOUT_STRIP:
2711                 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2712                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2713                 break;
2714         case TARGET_PROT_DOUT_INSERT:
2715         case TARGET_PROT_DIN_STRIP:
2716                 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2717                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2718                 break;
2719         case TARGET_PROT_DIN_PASS:
2720         case TARGET_PROT_DOUT_PASS:
2721                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2722                 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2723                 break;
2724         default:
2725                 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2726                 return -EINVAL;
2727         }
2728
2729         return 0;
2730 }
2731
2732 static inline u8
2733 isert_set_prot_checks(u8 prot_checks)
2734 {
2735         return (prot_checks & TARGET_DIF_CHECK_GUARD  ? 0xc0 : 0) |
2736                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2737                (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2738 }
2739
2740 static int
2741 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2742                  struct fast_reg_descriptor *fr_desc,
2743                  struct ib_sge *data_sge, struct ib_sge *prot_sge,
2744                  struct ib_sge *sig_sge)
2745 {
2746         struct ib_send_wr sig_wr, inv_wr;
2747         struct ib_send_wr *bad_wr, *wr = NULL;
2748         struct pi_context *pi_ctx = fr_desc->pi_ctx;
2749         struct ib_sig_attrs sig_attrs;
2750         int ret;
2751         u32 key;
2752
2753         memset(&sig_attrs, 0, sizeof(sig_attrs));
2754         ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2755         if (ret)
2756                 goto err;
2757
2758         sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2759
2760         if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2761                 memset(&inv_wr, 0, sizeof(inv_wr));
2762                 inv_wr.opcode = IB_WR_LOCAL_INV;
2763                 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2764                 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2765                 wr = &inv_wr;
2766                 /* Bump the key */
2767                 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2768                 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2769         }
2770
2771         memset(&sig_wr, 0, sizeof(sig_wr));
2772         sig_wr.opcode = IB_WR_REG_SIG_MR;
2773         sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2774         sig_wr.sg_list = data_sge;
2775         sig_wr.num_sge = 1;
2776         sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2777         sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2778         sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2779         if (se_cmd->t_prot_sg)
2780                 sig_wr.wr.sig_handover.prot = prot_sge;
2781
2782         if (!wr)
2783                 wr = &sig_wr;
2784         else
2785                 wr->next = &sig_wr;
2786
2787         ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2788         if (ret) {
2789                 pr_err("fast registration failed, ret:%d\n", ret);
2790                 goto err;
2791         }
2792         fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2793
2794         sig_sge->lkey = pi_ctx->sig_mr->lkey;
2795         sig_sge->addr = 0;
2796         sig_sge->length = se_cmd->data_length;
2797         if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2798             se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2799                 /*
2800                  * We have protection guards on the wire
2801                  * so we need to set a larget transfer
2802                  */
2803                 sig_sge->length += se_cmd->prot_length;
2804
2805         pr_debug("sig_sge: addr: 0x%llx  length: %u lkey: %x\n",
2806                  sig_sge->addr, sig_sge->length,
2807                  sig_sge->lkey);
2808 err:
2809         return ret;
2810 }
2811
2812 static int
2813 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2814                struct isert_rdma_wr *wr)
2815 {
2816         struct se_cmd *se_cmd = &cmd->se_cmd;
2817         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2818         struct isert_conn *isert_conn = conn->context;
2819         struct ib_sge data_sge;
2820         struct ib_send_wr *send_wr;
2821         struct fast_reg_descriptor *fr_desc = NULL;
2822         u32 offset;
2823         int ret = 0;
2824         unsigned long flags;
2825
2826         isert_cmd->tx_desc.isert_cmd = isert_cmd;
2827
2828         offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2829         ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2830                                  se_cmd->t_data_nents, se_cmd->data_length,
2831                                  offset, wr->iser_ib_op, &wr->data);
2832         if (ret)
2833                 return ret;
2834
2835         if (wr->data.dma_nents != 1 ||
2836             se_cmd->prot_op != TARGET_PROT_NORMAL) {
2837                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2838                 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2839                                            struct fast_reg_descriptor, list);
2840                 list_del(&fr_desc->list);
2841                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2842                 wr->fr_desc = fr_desc;
2843         }
2844
2845         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2846                                 ISERT_DATA_KEY_VALID, &data_sge);
2847         if (ret)
2848                 goto unmap_cmd;
2849
2850         if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2851                 struct ib_sge prot_sge, sig_sge;
2852
2853                 if (se_cmd->t_prot_sg) {
2854                         ret = isert_map_data_buf(isert_conn, isert_cmd,
2855                                                  se_cmd->t_prot_sg,
2856                                                  se_cmd->t_prot_nents,
2857                                                  se_cmd->prot_length,
2858                                                  0, wr->iser_ib_op, &wr->prot);
2859                         if (ret)
2860                                 goto unmap_cmd;
2861
2862                         ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2863                                                 ISERT_PROT_KEY_VALID, &prot_sge);
2864                         if (ret)
2865                                 goto unmap_prot_cmd;
2866                 }
2867
2868                 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2869                                        &data_sge, &prot_sge, &sig_sge);
2870                 if (ret)
2871                         goto unmap_prot_cmd;
2872
2873                 fr_desc->ind |= ISERT_PROTECTED;
2874                 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2875         } else
2876                 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2877
2878         wr->ib_sge = &wr->s_ib_sge;
2879         wr->send_wr_num = 1;
2880         memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2881         wr->send_wr = &wr->s_send_wr;
2882         wr->isert_cmd = isert_cmd;
2883
2884         send_wr = &isert_cmd->rdma_wr.s_send_wr;
2885         send_wr->sg_list = &wr->s_ib_sge;
2886         send_wr->num_sge = 1;
2887         send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2888         if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2889                 send_wr->opcode = IB_WR_RDMA_WRITE;
2890                 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2891                 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2892                 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2893                                       0 : IB_SEND_SIGNALED;
2894         } else {
2895                 send_wr->opcode = IB_WR_RDMA_READ;
2896                 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2897                 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2898                 send_wr->send_flags = IB_SEND_SIGNALED;
2899         }
2900
2901         return 0;
2902 unmap_prot_cmd:
2903         if (se_cmd->t_prot_sg)
2904                 isert_unmap_data_buf(isert_conn, &wr->prot);
2905 unmap_cmd:
2906         if (fr_desc) {
2907                 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2908                 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2909                 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2910         }
2911         isert_unmap_data_buf(isert_conn, &wr->data);
2912
2913         return ret;
2914 }
2915
2916 static int
2917 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2918 {
2919         struct se_cmd *se_cmd = &cmd->se_cmd;
2920         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2921         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2922         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2923         struct isert_device *device = isert_conn->conn_device;
2924         struct ib_send_wr *wr_failed;
2925         int rc;
2926
2927         pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2928                  isert_cmd, se_cmd->data_length);
2929         wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2930         rc = device->reg_rdma_mem(conn, cmd, wr);
2931         if (rc) {
2932                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2933                 return rc;
2934         }
2935
2936         if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2937                 /*
2938                  * Build isert_conn->tx_desc for iSCSI response PDU and attach
2939                  */
2940                 isert_create_send_desc(isert_conn, isert_cmd,
2941                                        &isert_cmd->tx_desc);
2942                 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2943                                      &isert_cmd->tx_desc.iscsi_header);
2944                 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2945                 isert_init_send_wr(isert_conn, isert_cmd,
2946                                    &isert_cmd->tx_desc.send_wr, false);
2947                 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2948                 wr->send_wr_num += 1;
2949         }
2950
2951         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2952
2953         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2954         if (rc) {
2955                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2956                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2957         }
2958
2959         if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2960                 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2961                          "READ\n", isert_cmd);
2962         else
2963                 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2964                          isert_cmd);
2965
2966         return 1;
2967 }
2968
2969 static int
2970 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2971 {
2972         struct se_cmd *se_cmd = &cmd->se_cmd;
2973         struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2974         struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2975         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2976         struct isert_device *device = isert_conn->conn_device;
2977         struct ib_send_wr *wr_failed;
2978         int rc;
2979
2980         pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2981                  isert_cmd, se_cmd->data_length, cmd->write_data_done);
2982         wr->iser_ib_op = ISER_IB_RDMA_READ;
2983         rc = device->reg_rdma_mem(conn, cmd, wr);
2984         if (rc) {
2985                 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2986                 return rc;
2987         }
2988
2989         atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2990
2991         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2992         if (rc) {
2993                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2994                 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2995         }
2996         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2997                  isert_cmd);
2998
2999         return 0;
3000 }
3001
3002 static int
3003 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3004 {
3005         int ret;
3006
3007         switch (state) {
3008         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3009                 ret = isert_put_nopin(cmd, conn, false);
3010                 break;
3011         default:
3012                 pr_err("Unknown immediate state: 0x%02x\n", state);
3013                 ret = -EINVAL;
3014                 break;
3015         }
3016
3017         return ret;
3018 }
3019
3020 static int
3021 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3022 {
3023         int ret;
3024
3025         switch (state) {
3026         case ISTATE_SEND_LOGOUTRSP:
3027                 ret = isert_put_logout_rsp(cmd, conn);
3028                 if (!ret) {
3029                         pr_debug("Returning iSER Logout -EAGAIN\n");
3030                         ret = -EAGAIN;
3031                 }
3032                 break;
3033         case ISTATE_SEND_NOPIN:
3034                 ret = isert_put_nopin(cmd, conn, true);
3035                 break;
3036         case ISTATE_SEND_TASKMGTRSP:
3037                 ret = isert_put_tm_rsp(cmd, conn);
3038                 break;
3039         case ISTATE_SEND_REJECT:
3040                 ret = isert_put_reject(cmd, conn);
3041                 break;
3042         case ISTATE_SEND_TEXTRSP:
3043                 ret = isert_put_text_rsp(cmd, conn);
3044                 break;
3045         case ISTATE_SEND_STATUS:
3046                 /*
3047                  * Special case for sending non GOOD SCSI status from TX thread
3048                  * context during pre se_cmd excecution failure.
3049                  */
3050                 ret = isert_put_response(conn, cmd);
3051                 break;
3052         default:
3053                 pr_err("Unknown response state: 0x%02x\n", state);
3054                 ret = -EINVAL;
3055                 break;
3056         }
3057
3058         return ret;
3059 }
3060
3061 static int
3062 isert_setup_np(struct iscsi_np *np,
3063                struct __kernel_sockaddr_storage *ksockaddr)
3064 {
3065         struct isert_np *isert_np;
3066         struct rdma_cm_id *isert_lid;
3067         struct sockaddr *sa;
3068         int ret;
3069
3070         isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3071         if (!isert_np) {
3072                 pr_err("Unable to allocate struct isert_np\n");
3073                 return -ENOMEM;
3074         }
3075         sema_init(&isert_np->np_sem, 0);
3076         mutex_init(&isert_np->np_accept_mutex);
3077         INIT_LIST_HEAD(&isert_np->np_accept_list);
3078         init_completion(&isert_np->np_login_comp);
3079
3080         sa = (struct sockaddr *)ksockaddr;
3081         pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3082         /*
3083          * Setup the np->np_sockaddr from the passed sockaddr setup
3084          * in iscsi_target_configfs.c code..
3085          */
3086         memcpy(&np->np_sockaddr, ksockaddr,
3087                sizeof(struct __kernel_sockaddr_storage));
3088
3089         isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3090                                 IB_QPT_RC);
3091         if (IS_ERR(isert_lid)) {
3092                 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3093                        PTR_ERR(isert_lid));
3094                 ret = PTR_ERR(isert_lid);
3095                 goto out;
3096         }
3097
3098         ret = rdma_bind_addr(isert_lid, sa);
3099         if (ret) {
3100                 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3101                 goto out_lid;
3102         }
3103
3104         ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3105         if (ret) {
3106                 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3107                 goto out_lid;
3108         }
3109
3110         isert_np->np_cm_id = isert_lid;
3111         np->np_context = isert_np;
3112         pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3113
3114         return 0;
3115
3116 out_lid:
3117         rdma_destroy_id(isert_lid);
3118 out:
3119         kfree(isert_np);
3120         return ret;
3121 }
3122
3123 static int
3124 isert_rdma_accept(struct isert_conn *isert_conn)
3125 {
3126         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3127         struct rdma_conn_param cp;
3128         int ret;
3129
3130         memset(&cp, 0, sizeof(struct rdma_conn_param));
3131         cp.initiator_depth = isert_conn->initiator_depth;
3132         cp.retry_count = 7;
3133         cp.rnr_retry_count = 7;
3134
3135         pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3136
3137         ret = rdma_accept(cm_id, &cp);
3138         if (ret) {
3139                 pr_err("rdma_accept() failed with: %d\n", ret);
3140                 return ret;
3141         }
3142
3143         pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3144
3145         return 0;
3146 }
3147
3148 static int
3149 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3150 {
3151         struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3152         int ret;
3153
3154         pr_info("before login_req comp conn: %p\n", isert_conn);
3155         ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3156         if (ret) {
3157                 pr_err("isert_conn %p interrupted before got login req\n",
3158                           isert_conn);
3159                 return ret;
3160         }
3161         reinit_completion(&isert_conn->login_req_comp);
3162
3163         /*
3164          * For login requests after the first PDU, isert_rx_login_req() will
3165          * kick schedule_delayed_work(&conn->login_work) as the packet is
3166          * received, which turns this callback from iscsi_target_do_login_rx()
3167          * into a NOP.
3168          */
3169         if (!login->first_request)
3170                 return 0;
3171
3172         isert_rx_login_req(isert_conn);
3173
3174         pr_info("before conn_login_comp conn: %p\n", conn);
3175         ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3176         if (ret)
3177                 return ret;
3178
3179         pr_info("processing login->req: %p\n", login->req);
3180
3181         return 0;
3182 }
3183
3184 static void
3185 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3186                     struct isert_conn *isert_conn)
3187 {
3188         struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3189         struct rdma_route *cm_route = &cm_id->route;
3190         struct sockaddr_in *sock_in;
3191         struct sockaddr_in6 *sock_in6;
3192
3193         conn->login_family = np->np_sockaddr.ss_family;
3194
3195         if (np->np_sockaddr.ss_family == AF_INET6) {
3196                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3197                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3198                          &sock_in6->sin6_addr.in6_u);
3199                 conn->login_port = ntohs(sock_in6->sin6_port);
3200
3201                 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3202                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3203                          &sock_in6->sin6_addr.in6_u);
3204                 conn->local_port = ntohs(sock_in6->sin6_port);
3205         } else {
3206                 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3207                 sprintf(conn->login_ip, "%pI4",
3208                         &sock_in->sin_addr.s_addr);
3209                 conn->login_port = ntohs(sock_in->sin_port);
3210
3211                 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3212                 sprintf(conn->local_ip, "%pI4",
3213                         &sock_in->sin_addr.s_addr);
3214                 conn->local_port = ntohs(sock_in->sin_port);
3215         }
3216 }
3217
3218 static int
3219 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3220 {
3221         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3222         struct isert_conn *isert_conn;
3223         int max_accept = 0, ret;
3224
3225 accept_wait:
3226         ret = down_interruptible(&isert_np->np_sem);
3227         if (ret || max_accept > 5)
3228                 return -ENODEV;
3229
3230         spin_lock_bh(&np->np_thread_lock);
3231         if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3232                 spin_unlock_bh(&np->np_thread_lock);
3233                 pr_debug("np_thread_state %d for isert_accept_np\n",
3234                          np->np_thread_state);
3235                 /**
3236                  * No point in stalling here when np_thread
3237                  * is in state RESET/SHUTDOWN/EXIT - bail
3238                  **/
3239                 return -ENODEV;
3240         }
3241         spin_unlock_bh(&np->np_thread_lock);
3242
3243         mutex_lock(&isert_np->np_accept_mutex);
3244         if (list_empty(&isert_np->np_accept_list)) {
3245                 mutex_unlock(&isert_np->np_accept_mutex);
3246                 max_accept++;
3247                 goto accept_wait;
3248         }
3249         isert_conn = list_first_entry(&isert_np->np_accept_list,
3250                         struct isert_conn, conn_accept_node);
3251         list_del_init(&isert_conn->conn_accept_node);
3252         mutex_unlock(&isert_np->np_accept_mutex);
3253
3254         conn->context = isert_conn;
3255         isert_conn->conn = conn;
3256         max_accept = 0;
3257
3258         isert_set_conn_info(np, conn, isert_conn);
3259
3260         pr_debug("Processing isert_conn: %p\n", isert_conn);
3261
3262         return 0;
3263 }
3264
3265 static void
3266 isert_free_np(struct iscsi_np *np)
3267 {
3268         struct isert_np *isert_np = (struct isert_np *)np->np_context;
3269
3270         if (isert_np->np_cm_id)
3271                 rdma_destroy_id(isert_np->np_cm_id);
3272
3273         np->np_context = NULL;
3274         kfree(isert_np);
3275 }
3276
3277 static void isert_wait_conn(struct iscsi_conn *conn)
3278 {
3279         struct isert_conn *isert_conn = conn->context;
3280
3281         pr_debug("isert_wait_conn: Starting \n");
3282
3283         mutex_lock(&isert_conn->conn_mutex);
3284         /*
3285          * Only wait for conn_wait_comp_err if the isert_conn made it
3286          * into full feature phase..
3287          */
3288         if (isert_conn->state == ISER_CONN_INIT) {
3289                 mutex_unlock(&isert_conn->conn_mutex);
3290                 return;
3291         }
3292         isert_conn_terminate(isert_conn);
3293         mutex_unlock(&isert_conn->conn_mutex);
3294
3295         wait_for_completion(&isert_conn->conn_wait_comp_err);
3296         wait_for_completion(&isert_conn->conn_wait);
3297
3298         mutex_lock(&isert_conn->conn_mutex);
3299         isert_conn->state = ISER_CONN_DOWN;
3300         mutex_unlock(&isert_conn->conn_mutex);
3301
3302         pr_info("Destroying conn %p\n", isert_conn);
3303         isert_put_conn(isert_conn);
3304 }
3305
3306 static void isert_free_conn(struct iscsi_conn *conn)
3307 {
3308         struct isert_conn *isert_conn = conn->context;
3309
3310         isert_put_conn(isert_conn);
3311 }
3312
3313 static struct iscsit_transport iser_target_transport = {
3314         .name                   = "IB/iSER",
3315         .transport_type         = ISCSI_INFINIBAND,
3316         .priv_size              = sizeof(struct isert_cmd),
3317         .owner                  = THIS_MODULE,
3318         .iscsit_setup_np        = isert_setup_np,
3319         .iscsit_accept_np       = isert_accept_np,
3320         .iscsit_free_np         = isert_free_np,
3321         .iscsit_wait_conn       = isert_wait_conn,
3322         .iscsit_free_conn       = isert_free_conn,
3323         .iscsit_get_login_rx    = isert_get_login_rx,
3324         .iscsit_put_login_tx    = isert_put_login_tx,
3325         .iscsit_immediate_queue = isert_immediate_queue,
3326         .iscsit_response_queue  = isert_response_queue,
3327         .iscsit_get_dataout     = isert_get_dataout,
3328         .iscsit_queue_data_in   = isert_put_datain,
3329         .iscsit_queue_status    = isert_put_response,
3330         .iscsit_aborted_task    = isert_aborted_task,
3331         .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3332 };
3333
3334 static int __init isert_init(void)
3335 {
3336         int ret;
3337
3338         isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3339         if (!isert_rx_wq) {
3340                 pr_err("Unable to allocate isert_rx_wq\n");
3341                 return -ENOMEM;
3342         }
3343
3344         isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3345         if (!isert_comp_wq) {
3346                 pr_err("Unable to allocate isert_comp_wq\n");
3347                 ret = -ENOMEM;
3348                 goto destroy_rx_wq;
3349         }
3350
3351         iscsit_register_transport(&iser_target_transport);
3352         pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3353         return 0;
3354
3355 destroy_rx_wq:
3356         destroy_workqueue(isert_rx_wq);
3357         return ret;
3358 }
3359
3360 static void __exit isert_exit(void)
3361 {
3362         flush_scheduled_work();
3363         destroy_workqueue(isert_comp_wq);
3364         destroy_workqueue(isert_rx_wq);
3365         iscsit_unregister_transport(&iser_target_transport);
3366         pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3367 }
3368
3369 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3370 MODULE_VERSION("0.1");
3371 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3372 MODULE_LICENSE("GPL");
3373
3374 module_init(isert_init);
3375 module_exit(isert_exit);