drivers/infiniband/ulp/iser/iser_initiator.c

   1 /*
   2  * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2013 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33 #include <linux/kernel.h>
  34 #include <linux/slab.h>
  35 #include <linux/mm.h>
  36 #include <linux/scatterlist.h>
  37 #include <linux/kfifo.h>
  38 #include <scsi/scsi_cmnd.h>
  39 #include <scsi/scsi_host.h>
  40
  41 #include "iscsi_iser.h"
  42
  43 /* Register user buffer memory and initialize passive rdma
  44  *  dto descriptor. Total data size is stored in
  45  *  iser_task->data[ISER_DIR_IN].data_len
  46  */
  47 static int iser_prepare_read_cmd(struct iscsi_task *task,
  48                                  unsigned int edtl)
  49
  50 {
  51         struct iscsi_iser_task *iser_task = task->dd_data;
  52         struct iser_regd_buf *regd_buf;
  53         int err;
  54         struct iser_hdr *hdr = &iser_task->desc.iser_header;
  55         struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
  56
  57         err = iser_dma_map_task_data(iser_task,
  58                                      buf_in,
  59                                      ISER_DIR_IN,
  60                                      DMA_FROM_DEVICE);
  61         if (err)
  62                 return err;
  63
  64         if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
  65                 iser_err("Total data length: %ld, less than EDTL: "
  66                          "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
  67                          iser_task->data[ISER_DIR_IN].data_len, edtl,
  68                          task->itt, iser_task->iser_conn);
  69                 return -EINVAL;
  70         }
  71
  72         err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN);
  73         if (err) {
  74                 iser_err("Failed to set up Data-IN RDMA\n");
  75                 return err;
  76         }
  77         regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
  78
  79         hdr->flags    |= ISER_RSV;
  80         hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
  81         hdr->read_va   = cpu_to_be64(regd_buf->reg.va);
  82
  83         iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
  84                  task->itt, regd_buf->reg.rkey,
  85                  (unsigned long long)regd_buf->reg.va);
  86
  87         return 0;
  88 }
  89
  90 /* Register user buffer memory and initialize passive rdma
  91  *  dto descriptor. Total data size is stored in
  92  *  task->data[ISER_DIR_OUT].data_len
  93  */
  94 static int
  95 iser_prepare_write_cmd(struct iscsi_task *task,
  96                        unsigned int imm_sz,
  97                        unsigned int unsol_sz,
  98                        unsigned int edtl)
  99 {
 100         struct iscsi_iser_task *iser_task = task->dd_data;
 101         struct iser_regd_buf *regd_buf;
 102         int err;
 103         struct iser_hdr *hdr = &iser_task->desc.iser_header;
 104         struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
 105         struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
 106
 107         err = iser_dma_map_task_data(iser_task,
 108                                      buf_out,
 109                                      ISER_DIR_OUT,
 110                                      DMA_TO_DEVICE);
 111         if (err)
 112                 return err;
 113
 114         if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
 115                 iser_err("Total data length: %ld, less than EDTL: %d, "
 116                          "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
 117                          iser_task->data[ISER_DIR_OUT].data_len,
 118                          edtl, task->itt, task->conn);
 119                 return -EINVAL;
 120         }
 121
 122         err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT);
 123         if (err != 0) {
 124                 iser_err("Failed to register write cmd RDMA mem\n");
 125                 return err;
 126         }
 127
 128         regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
 129
 130         if (unsol_sz < edtl) {
 131                 hdr->flags     |= ISER_WSV;
 132                 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
 133                 hdr->write_va   = cpu_to_be64(regd_buf->reg.va + unsol_sz);
 134
 135                 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
 136                          "VA:%#llX + unsol:%d\n",
 137                          task->itt, regd_buf->reg.rkey,
 138                          (unsigned long long)regd_buf->reg.va, unsol_sz);
 139         }
 140
 141         if (imm_sz > 0) {
 142                 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
 143                          task->itt, imm_sz);
 144                 tx_dsg->addr   = regd_buf->reg.va;
 145                 tx_dsg->length = imm_sz;
 146                 tx_dsg->lkey   = regd_buf->reg.lkey;
 147                 iser_task->desc.num_sge = 2;
 148         }
 149
 150         return 0;
 151 }
 152
 153 /* creates a new tx descriptor and adds header regd buffer */
 154 static void iser_create_send_desc(struct iser_conn      *ib_conn,
 155                                   struct iser_tx_desc   *tx_desc)
 156 {
 157         struct iser_device *device = ib_conn->device;
 158
 159         ib_dma_sync_single_for_cpu(device->ib_device,
 160                 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
 161
 162         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 163         tx_desc->iser_header.flags = ISER_VER;
 164
 165         tx_desc->num_sge = 1;
 166
 167         if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
 168                 tx_desc->tx_sg[0].lkey = device->mr->lkey;
 169                 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
 170         }
 171 }
 172
 173
 174 int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
 175 {
 176         int i, j;
 177         u64 dma_addr;
 178         struct iser_rx_desc *rx_desc;
 179         struct ib_sge       *rx_sg;
 180         struct iser_device  *device = ib_conn->device;
 181
 182         ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
 183                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 184         if (!ib_conn->rx_descs)
 185                 goto rx_desc_alloc_fail;
 186
 187         rx_desc = ib_conn->rx_descs;
 188
 189         for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 190                 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
 191                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 192                 if (ib_dma_mapping_error(device->ib_device, dma_addr))
 193                         goto rx_desc_dma_map_failed;
 194
 195                 rx_desc->dma_addr = dma_addr;
 196
 197                 rx_sg = &rx_desc->rx_sg;
 198                 rx_sg->addr   = rx_desc->dma_addr;
 199                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 200                 rx_sg->lkey   = device->mr->lkey;
 201         }
 202
 203         ib_conn->rx_desc_head = 0;
 204         return 0;
 205
 206 rx_desc_dma_map_failed:
 207         rx_desc = ib_conn->rx_descs;
 208         for (j = 0; j < i; j++, rx_desc++)
 209                 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
 210                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 211         kfree(ib_conn->rx_descs);
 212         ib_conn->rx_descs = NULL;
 213 rx_desc_alloc_fail:
 214         iser_err("failed allocating rx descriptors / data buffers\n");
 215         return -ENOMEM;
 216 }
 217
 218 void iser_free_rx_descriptors(struct iser_conn *ib_conn)
 219 {
 220         int i;
 221         struct iser_rx_desc *rx_desc;
 222         struct iser_device *device = ib_conn->device;
 223
 224         if (!ib_conn->rx_descs)
 225                 return;
 226
 227         rx_desc = ib_conn->rx_descs;
 228         for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
 229                 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
 230                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 231         kfree(ib_conn->rx_descs);
 232 }
 233
 234 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
 235 {
 236         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 237
 238         iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
 239         /* check if this is the last login - going to full feature phase */
 240         if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
 241                 return 0;
 242
 243         /*
 244          * Check that there is one posted recv buffer (for the last login
 245          * response) and no posted send buffers left - they must have been
 246          * consumed during previous login phases.
 247          */
 248         WARN_ON(iser_conn->ib_conn->post_recv_buf_count != 1);
 249         WARN_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
 250
 251         iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
 252         /* Initial post receive buffers */
 253         if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
 254                 return -ENOMEM;
 255
 256         return 0;
 257 }
 258
 259 /**
 260  * iser_send_command - send command PDU
 261  */
 262 int iser_send_command(struct iscsi_conn *conn,
 263                       struct iscsi_task *task)
 264 {
 265         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 266         struct iscsi_iser_task *iser_task = task->dd_data;
 267         unsigned long edtl;
 268         int err;
 269         struct iser_data_buf *data_buf;
 270         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
 271         struct scsi_cmnd *sc  =  task->sc;
 272         struct iser_tx_desc *tx_desc = &iser_task->desc;
 273
 274         edtl = ntohl(hdr->data_length);
 275
 276         /* build the tx desc regd header and add it to the tx desc dto */
 277         tx_desc->type = ISCSI_TX_SCSI_COMMAND;
 278         iser_create_send_desc(iser_conn->ib_conn, tx_desc);
 279
 280         if (hdr->flags & ISCSI_FLAG_CMD_READ)
 281                 data_buf = &iser_task->data[ISER_DIR_IN];
 282         else
 283                 data_buf = &iser_task->data[ISER_DIR_OUT];
 284
 285         if (scsi_sg_count(sc)) { /* using a scatter list */
 286                 data_buf->buf  = scsi_sglist(sc);
 287                 data_buf->size = scsi_sg_count(sc);
 288         }
 289
 290         data_buf->data_len = scsi_bufflen(sc);
 291
 292         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 293                 err = iser_prepare_read_cmd(task, edtl);
 294                 if (err)
 295                         goto send_command_error;
 296         }
 297         if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
 298                 err = iser_prepare_write_cmd(task,
 299                                              task->imm_count,
 300                                              task->imm_count +
 301                                              task->unsol_r2t.data_length,
 302                                              edtl);
 303                 if (err)
 304                         goto send_command_error;
 305         }
 306
 307         iser_task->status = ISER_TASK_STATUS_STARTED;
 308
 309         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 310         if (!err)
 311                 return 0;
 312
 313 send_command_error:
 314         iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
 315         return err;
 316 }
 317
 318 /**
 319  * iser_send_data_out - send data out PDU
 320  */
 321 int iser_send_data_out(struct iscsi_conn *conn,
 322                        struct iscsi_task *task,
 323                        struct iscsi_data *hdr)
 324 {
 325         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 326         struct iscsi_iser_task *iser_task = task->dd_data;
 327         struct iser_tx_desc *tx_desc = NULL;
 328         struct iser_regd_buf *regd_buf;
 329         unsigned long buf_offset;
 330         unsigned long data_seg_len;
 331         uint32_t itt;
 332         int err = 0;
 333         struct ib_sge *tx_dsg;
 334
 335         itt = (__force uint32_t)hdr->itt;
 336         data_seg_len = ntoh24(hdr->dlength);
 337         buf_offset   = ntohl(hdr->offset);
 338
 339         iser_dbg("%s itt %d dseg_len %d offset %d\n",
 340                  __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
 341
 342         tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
 343         if (tx_desc == NULL) {
 344                 iser_err("Failed to alloc desc for post dataout\n");
 345                 return -ENOMEM;
 346         }
 347
 348         tx_desc->type = ISCSI_TX_DATAOUT;
 349         tx_desc->iser_header.flags = ISER_VER;
 350         memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
 351
 352         /* build the tx desc */
 353         iser_initialize_task_headers(task, tx_desc);
 354
 355         regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
 356         tx_dsg = &tx_desc->tx_sg[1];
 357         tx_dsg->addr    = regd_buf->reg.va + buf_offset;
 358         tx_dsg->length  = data_seg_len;
 359         tx_dsg->lkey    = regd_buf->reg.lkey;
 360         tx_desc->num_sge = 2;
 361
 362         if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
 363                 iser_err("Offset:%ld & DSL:%ld in Data-Out "
 364                          "inconsistent with total len:%ld, itt:%d\n",
 365                          buf_offset, data_seg_len,
 366                          iser_task->data[ISER_DIR_OUT].data_len, itt);
 367                 err = -EINVAL;
 368                 goto send_data_out_error;
 369         }
 370         iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
 371                  itt, buf_offset, data_seg_len);
 372
 373
 374         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 375         if (!err)
 376                 return 0;
 377
 378 send_data_out_error:
 379         kmem_cache_free(ig.desc_cache, tx_desc);
 380         iser_err("conn %p failed err %d\n",conn, err);
 381         return err;
 382 }
 383
 384 int iser_send_control(struct iscsi_conn *conn,
 385                       struct iscsi_task *task)
 386 {
 387         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 388         struct iscsi_iser_task *iser_task = task->dd_data;
 389         struct iser_tx_desc *mdesc = &iser_task->desc;
 390         unsigned long data_seg_len;
 391         int err = 0;
 392         struct iser_device *device;
 393         struct iser_conn *ib_conn = iser_conn->ib_conn;
 394
 395         /* build the tx desc regd header and add it to the tx desc dto */
 396         mdesc->type = ISCSI_TX_CONTROL;
 397         iser_create_send_desc(iser_conn->ib_conn, mdesc);
 398
 399         device = iser_conn->ib_conn->device;
 400
 401         data_seg_len = ntoh24(task->hdr->dlength);
 402
 403         if (data_seg_len > 0) {
 404                 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
 405                 if (task != conn->login_task) {
 406                         iser_err("data present on non login task!!!\n");
 407                         goto send_control_error;
 408                 }
 409
 410                 ib_dma_sync_single_for_cpu(device->ib_device,
 411                         ib_conn->login_req_dma, task->data_count,
 412                         DMA_TO_DEVICE);
 413
 414                 memcpy(iser_conn->ib_conn->login_req_buf, task->data,
 415                                                         task->data_count);
 416
 417                 ib_dma_sync_single_for_device(device->ib_device,
 418                         ib_conn->login_req_dma, task->data_count,
 419                         DMA_TO_DEVICE);
 420
 421                 tx_dsg->addr    = iser_conn->ib_conn->login_req_dma;
 422                 tx_dsg->length  = task->data_count;
 423                 tx_dsg->lkey    = device->mr->lkey;
 424                 mdesc->num_sge = 2;
 425         }
 426
 427         if (task == conn->login_task) {
 428                 err = iser_post_recvl(iser_conn->ib_conn);
 429                 if (err)
 430                         goto send_control_error;
 431                 err = iser_post_rx_bufs(conn, task->hdr);
 432                 if (err)
 433                         goto send_control_error;
 434         }
 435
 436         err = iser_post_send(iser_conn->ib_conn, mdesc);
 437         if (!err)
 438                 return 0;
 439
 440 send_control_error:
 441         iser_err("conn %p failed err %d\n",conn, err);
 442         return err;
 443 }
 444
 445 /**
 446  * iser_rcv_dto_completion - recv DTO completion
 447  */
 448 void iser_rcv_completion(struct iser_rx_desc *rx_desc,
 449                          unsigned long rx_xfer_len,
 450                          struct iser_conn *ib_conn)
 451 {
 452         struct iscsi_iser_conn *conn = ib_conn->iser_conn;
 453         struct iscsi_hdr *hdr;
 454         u64 rx_dma;
 455         int rx_buflen, outstanding, count, err;
 456
 457         /* differentiate between login to all other PDUs */
 458         if ((char *)rx_desc == ib_conn->login_resp_buf) {
 459                 rx_dma = ib_conn->login_resp_dma;
 460                 rx_buflen = ISER_RX_LOGIN_SIZE;
 461         } else {
 462                 rx_dma = rx_desc->dma_addr;
 463                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
 464         }
 465
 466         ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
 467                         rx_buflen, DMA_FROM_DEVICE);
 468
 469         hdr = &rx_desc->iscsi_header;
 470
 471         iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
 472                         hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
 473
 474         iscsi_iser_recv(conn->iscsi_conn, hdr,
 475                 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
 476
 477         ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
 478                         rx_buflen, DMA_FROM_DEVICE);
 479
 480         /* decrementing conn->post_recv_buf_count only --after-- freeing the   *
 481          * task eliminates the need to worry on tasks which are completed in   *
 482          * parallel to the execution of iser_conn_term. So the code that waits *
 483          * for the posted rx bufs refcount to become zero handles everything   */
 484         conn->ib_conn->post_recv_buf_count--;
 485
 486         if (rx_dma == ib_conn->login_resp_dma)
 487                 return;
 488
 489         outstanding = ib_conn->post_recv_buf_count;
 490         if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
 491                 count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
 492                                                 ISER_MIN_POSTED_RX);
 493                 err = iser_post_recvm(ib_conn, count);
 494                 if (err)
 495                         iser_err("posting %d rx bufs err %d\n", count, err);
 496         }
 497 }
 498
 499 void iser_snd_completion(struct iser_tx_desc *tx_desc,
 500                         struct iser_conn *ib_conn)
 501 {
 502         struct iscsi_task *task;
 503         struct iser_device *device = ib_conn->device;
 504
 505         if (tx_desc->type == ISCSI_TX_DATAOUT) {
 506                 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
 507                                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 508                 kmem_cache_free(ig.desc_cache, tx_desc);
 509         }
 510
 511         atomic_dec(&ib_conn->post_send_buf_count);
 512
 513         if (tx_desc->type == ISCSI_TX_CONTROL) {
 514                 /* this arithmetic is legal by libiscsi dd_data allocation */
 515                 task = (void *) ((long)(void *)tx_desc -
 516                                   sizeof(struct iscsi_task));
 517                 if (task->hdr->itt == RESERVED_ITT)
 518                         iscsi_put_task(task);
 519         }
 520 }
 521
 522 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
 523
 524 {
 525         iser_task->status = ISER_TASK_STATUS_INIT;
 526
 527         iser_task->dir[ISER_DIR_IN] = 0;
 528         iser_task->dir[ISER_DIR_OUT] = 0;
 529
 530         iser_task->data[ISER_DIR_IN].data_len  = 0;
 531         iser_task->data[ISER_DIR_OUT].data_len = 0;
 532
 533         memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
 534                sizeof(struct iser_regd_buf));
 535         memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
 536                sizeof(struct iser_regd_buf));
 537 }
 538
 539 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
 540 {
 541         int is_rdma_aligned = 1;
 542         struct iser_regd_buf *regd;
 543
 544         /* if we were reading, copy back to unaligned sglist,
 545          * anyway dma_unmap and free the copy
 546          */
 547         if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
 548                 is_rdma_aligned = 0;
 549                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
 550         }
 551         if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
 552                 is_rdma_aligned = 0;
 553                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
 554         }
 555
 556         if (iser_task->dir[ISER_DIR_IN]) {
 557                 regd = &iser_task->rdma_regd[ISER_DIR_IN];
 558                 if (regd->reg.is_fmr)
 559                         iser_unreg_mem(&regd->reg);
 560         }
 561
 562         if (iser_task->dir[ISER_DIR_OUT]) {
 563                 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
 564                 if (regd->reg.is_fmr)
 565                         iser_unreg_mem(&regd->reg);
 566         }
 567
 568        /* if the data was unaligned, it was already unmapped and then copied */
 569        if (is_rdma_aligned)
 570                 iser_dma_unmap_task_data(iser_task);
 571 }