drivers/infiniband/ulp/iser/iser_initiator.c

   1 /*
   2  * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32 #include <linux/kernel.h>
  33 #include <linux/slab.h>
  34 #include <linux/mm.h>
  35 #include <linux/scatterlist.h>
  36 #include <linux/kfifo.h>
  37 #include <scsi/scsi_cmnd.h>
  38 #include <scsi/scsi_host.h>
  39
  40 #include "iscsi_iser.h"
  41
  42 /* Register user buffer memory and initialize passive rdma
  43  *  dto descriptor. Total data size is stored in
  44  *  iser_task->data[ISER_DIR_IN].data_len
  45  */
  46 static int iser_prepare_read_cmd(struct iscsi_task *task,
  47                                  unsigned int edtl)
  48
  49 {
  50         struct iscsi_iser_task *iser_task = task->dd_data;
  51         struct iser_regd_buf *regd_buf;
  52         int err;
  53         struct iser_hdr *hdr = &iser_task->desc.iser_header;
  54         struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN];
  55
  56         err = iser_dma_map_task_data(iser_task,
  57                                      buf_in,
  58                                      ISER_DIR_IN,
  59                                      DMA_FROM_DEVICE);
  60         if (err)
  61                 return err;
  62
  63         if (edtl > iser_task->data[ISER_DIR_IN].data_len) {
  64                 iser_err("Total data length: %ld, less than EDTL: "
  65                          "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
  66                          iser_task->data[ISER_DIR_IN].data_len, edtl,
  67                          task->itt, iser_task->iser_conn);
  68                 return -EINVAL;
  69         }
  70
  71         err = iser_reg_rdma_mem(iser_task,ISER_DIR_IN);
  72         if (err) {
  73                 iser_err("Failed to set up Data-IN RDMA\n");
  74                 return err;
  75         }
  76         regd_buf = &iser_task->rdma_regd[ISER_DIR_IN];
  77
  78         hdr->flags    |= ISER_RSV;
  79         hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
  80         hdr->read_va   = cpu_to_be64(regd_buf->reg.va);
  81
  82         iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
  83                  task->itt, regd_buf->reg.rkey,
  84                  (unsigned long long)regd_buf->reg.va);
  85
  86         return 0;
  87 }
  88
  89 /* Register user buffer memory and initialize passive rdma
  90  *  dto descriptor. Total data size is stored in
  91  *  task->data[ISER_DIR_OUT].data_len
  92  */
  93 static int
  94 iser_prepare_write_cmd(struct iscsi_task *task,
  95                        unsigned int imm_sz,
  96                        unsigned int unsol_sz,
  97                        unsigned int edtl)
  98 {
  99         struct iscsi_iser_task *iser_task = task->dd_data;
 100         struct iser_regd_buf *regd_buf;
 101         int err;
 102         struct iser_hdr *hdr = &iser_task->desc.iser_header;
 103         struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT];
 104         struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1];
 105
 106         err = iser_dma_map_task_data(iser_task,
 107                                      buf_out,
 108                                      ISER_DIR_OUT,
 109                                      DMA_TO_DEVICE);
 110         if (err)
 111                 return err;
 112
 113         if (edtl > iser_task->data[ISER_DIR_OUT].data_len) {
 114                 iser_err("Total data length: %ld, less than EDTL: %d, "
 115                          "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
 116                          iser_task->data[ISER_DIR_OUT].data_len,
 117                          edtl, task->itt, task->conn);
 118                 return -EINVAL;
 119         }
 120
 121         err = iser_reg_rdma_mem(iser_task,ISER_DIR_OUT);
 122         if (err != 0) {
 123                 iser_err("Failed to register write cmd RDMA mem\n");
 124                 return err;
 125         }
 126
 127         regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
 128
 129         if (unsol_sz < edtl) {
 130                 hdr->flags     |= ISER_WSV;
 131                 hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
 132                 hdr->write_va   = cpu_to_be64(regd_buf->reg.va + unsol_sz);
 133
 134                 iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
 135                          "VA:%#llX + unsol:%d\n",
 136                          task->itt, regd_buf->reg.rkey,
 137                          (unsigned long long)regd_buf->reg.va, unsol_sz);
 138         }
 139
 140         if (imm_sz > 0) {
 141                 iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
 142                          task->itt, imm_sz);
 143                 tx_dsg->addr   = regd_buf->reg.va;
 144                 tx_dsg->length = imm_sz;
 145                 tx_dsg->lkey   = regd_buf->reg.lkey;
 146                 iser_task->desc.num_sge = 2;
 147         }
 148
 149         return 0;
 150 }
 151
 152 /* creates a new tx descriptor and adds header regd buffer */
 153 static void iser_create_send_desc(struct iser_conn      *ib_conn,
 154                                   struct iser_tx_desc   *tx_desc)
 155 {
 156         struct iser_device *device = ib_conn->device;
 157
 158         ib_dma_sync_single_for_cpu(device->ib_device,
 159                 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
 160
 161         memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
 162         tx_desc->iser_header.flags = ISER_VER;
 163
 164         tx_desc->num_sge = 1;
 165
 166         if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
 167                 tx_desc->tx_sg[0].lkey = device->mr->lkey;
 168                 iser_dbg("sdesc %p lkey mismatch, fixing\n", tx_desc);
 169         }
 170 }
 171
 172
 173 static int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
 174 {
 175         int i, j;
 176         u64 dma_addr;
 177         struct iser_rx_desc *rx_desc;
 178         struct ib_sge       *rx_sg;
 179         struct iser_device  *device = ib_conn->device;
 180
 181         ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
 182                                 sizeof(struct iser_rx_desc), GFP_KERNEL);
 183         if (!ib_conn->rx_descs)
 184                 goto rx_desc_alloc_fail;
 185
 186         rx_desc = ib_conn->rx_descs;
 187
 188         for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
 189                 dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
 190                                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 191                 if (ib_dma_mapping_error(device->ib_device, dma_addr))
 192                         goto rx_desc_dma_map_failed;
 193
 194                 rx_desc->dma_addr = dma_addr;
 195
 196                 rx_sg = &rx_desc->rx_sg;
 197                 rx_sg->addr   = rx_desc->dma_addr;
 198                 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
 199                 rx_sg->lkey   = device->mr->lkey;
 200         }
 201
 202         ib_conn->rx_desc_head = 0;
 203         return 0;
 204
 205 rx_desc_dma_map_failed:
 206         rx_desc = ib_conn->rx_descs;
 207         for (j = 0; j < i; j++, rx_desc++)
 208                 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
 209                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 210         kfree(ib_conn->rx_descs);
 211         ib_conn->rx_descs = NULL;
 212 rx_desc_alloc_fail:
 213         iser_err("failed allocating rx descriptors / data buffers\n");
 214         return -ENOMEM;
 215 }
 216
 217 void iser_free_rx_descriptors(struct iser_conn *ib_conn)
 218 {
 219         int i;
 220         struct iser_rx_desc *rx_desc;
 221         struct iser_device *device = ib_conn->device;
 222
 223         if (ib_conn->login_buf) {
 224                 if (ib_conn->login_req_dma)
 225                         ib_dma_unmap_single(device->ib_device,
 226                                 ib_conn->login_req_dma,
 227                                 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
 228                 if (ib_conn->login_resp_dma)
 229                         ib_dma_unmap_single(device->ib_device,
 230                                 ib_conn->login_resp_dma,
 231                                 ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
 232                 kfree(ib_conn->login_buf);
 233         }
 234
 235         if (!ib_conn->rx_descs)
 236                 return;
 237
 238         rx_desc = ib_conn->rx_descs;
 239         for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++)
 240                 ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
 241                         ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
 242         kfree(ib_conn->rx_descs);
 243 }
 244
 245 /**
 246  *  iser_conn_set_full_featured_mode - (iSER API)
 247  */
 248 int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
 249 {
 250         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 251
 252         iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
 253
 254         /* Check that there is no posted recv or send buffers left - */
 255         /* they must be consumed during the login phase */
 256         BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0);
 257         BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
 258
 259         if (iser_alloc_rx_descriptors(iser_conn->ib_conn))
 260                 return -ENOMEM;
 261
 262         /* Initial post receive buffers */
 263         if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
 264                 return -ENOMEM;
 265
 266         return 0;
 267 }
 268
 269 /**
 270  * iser_send_command - send command PDU
 271  */
 272 int iser_send_command(struct iscsi_conn *conn,
 273                       struct iscsi_task *task)
 274 {
 275         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 276         struct iscsi_iser_task *iser_task = task->dd_data;
 277         unsigned long edtl;
 278         int err;
 279         struct iser_data_buf *data_buf;
 280         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
 281         struct scsi_cmnd *sc  =  task->sc;
 282         struct iser_tx_desc *tx_desc = &iser_task->desc;
 283
 284         edtl = ntohl(hdr->data_length);
 285
 286         /* build the tx desc regd header and add it to the tx desc dto */
 287         tx_desc->type = ISCSI_TX_SCSI_COMMAND;
 288         iser_create_send_desc(iser_conn->ib_conn, tx_desc);
 289
 290         if (hdr->flags & ISCSI_FLAG_CMD_READ)
 291                 data_buf = &iser_task->data[ISER_DIR_IN];
 292         else
 293                 data_buf = &iser_task->data[ISER_DIR_OUT];
 294
 295         if (scsi_sg_count(sc)) { /* using a scatter list */
 296                 data_buf->buf  = scsi_sglist(sc);
 297                 data_buf->size = scsi_sg_count(sc);
 298         }
 299
 300         data_buf->data_len = scsi_bufflen(sc);
 301
 302         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 303                 err = iser_prepare_read_cmd(task, edtl);
 304                 if (err)
 305                         goto send_command_error;
 306         }
 307         if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
 308                 err = iser_prepare_write_cmd(task,
 309                                              task->imm_count,
 310                                              task->imm_count +
 311                                              task->unsol_r2t.data_length,
 312                                              edtl);
 313                 if (err)
 314                         goto send_command_error;
 315         }
 316
 317         iser_task->status = ISER_TASK_STATUS_STARTED;
 318
 319         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 320         if (!err)
 321                 return 0;
 322
 323 send_command_error:
 324         iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
 325         return err;
 326 }
 327
 328 /**
 329  * iser_send_data_out - send data out PDU
 330  */
 331 int iser_send_data_out(struct iscsi_conn *conn,
 332                        struct iscsi_task *task,
 333                        struct iscsi_data *hdr)
 334 {
 335         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 336         struct iscsi_iser_task *iser_task = task->dd_data;
 337         struct iser_tx_desc *tx_desc = NULL;
 338         struct iser_regd_buf *regd_buf;
 339         unsigned long buf_offset;
 340         unsigned long data_seg_len;
 341         uint32_t itt;
 342         int err = 0;
 343         struct ib_sge *tx_dsg;
 344
 345         itt = (__force uint32_t)hdr->itt;
 346         data_seg_len = ntoh24(hdr->dlength);
 347         buf_offset   = ntohl(hdr->offset);
 348
 349         iser_dbg("%s itt %d dseg_len %d offset %d\n",
 350                  __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
 351
 352         tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
 353         if (tx_desc == NULL) {
 354                 iser_err("Failed to alloc desc for post dataout\n");
 355                 return -ENOMEM;
 356         }
 357
 358         tx_desc->type = ISCSI_TX_DATAOUT;
 359         tx_desc->iser_header.flags = ISER_VER;
 360         memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
 361
 362         /* build the tx desc */
 363         iser_initialize_task_headers(task, tx_desc);
 364
 365         regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
 366         tx_dsg = &tx_desc->tx_sg[1];
 367         tx_dsg->addr    = regd_buf->reg.va + buf_offset;
 368         tx_dsg->length  = data_seg_len;
 369         tx_dsg->lkey    = regd_buf->reg.lkey;
 370         tx_desc->num_sge = 2;
 371
 372         if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
 373                 iser_err("Offset:%ld & DSL:%ld in Data-Out "
 374                          "inconsistent with total len:%ld, itt:%d\n",
 375                          buf_offset, data_seg_len,
 376                          iser_task->data[ISER_DIR_OUT].data_len, itt);
 377                 err = -EINVAL;
 378                 goto send_data_out_error;
 379         }
 380         iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
 381                  itt, buf_offset, data_seg_len);
 382
 383
 384         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 385         if (!err)
 386                 return 0;
 387
 388 send_data_out_error:
 389         kmem_cache_free(ig.desc_cache, tx_desc);
 390         iser_err("conn %p failed err %d\n",conn, err);
 391         return err;
 392 }
 393
 394 int iser_send_control(struct iscsi_conn *conn,
 395                       struct iscsi_task *task)
 396 {
 397         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 398         struct iscsi_iser_task *iser_task = task->dd_data;
 399         struct iser_tx_desc *mdesc = &iser_task->desc;
 400         unsigned long data_seg_len;
 401         int err = 0;
 402         struct iser_device *device;
 403         struct iser_conn *ib_conn = iser_conn->ib_conn;
 404
 405         /* build the tx desc regd header and add it to the tx desc dto */
 406         mdesc->type = ISCSI_TX_CONTROL;
 407         iser_create_send_desc(iser_conn->ib_conn, mdesc);
 408
 409         device = iser_conn->ib_conn->device;
 410
 411         data_seg_len = ntoh24(task->hdr->dlength);
 412
 413         if (data_seg_len > 0) {
 414                 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
 415                 if (task != conn->login_task) {
 416                         iser_err("data present on non login task!!!\n");
 417                         goto send_control_error;
 418                 }
 419
 420                 ib_dma_sync_single_for_cpu(device->ib_device,
 421                         ib_conn->login_req_dma, task->data_count,
 422                         DMA_TO_DEVICE);
 423
 424                 memcpy(iser_conn->ib_conn->login_req_buf, task->data,
 425                                                         task->data_count);
 426
 427                 ib_dma_sync_single_for_device(device->ib_device,
 428                         ib_conn->login_req_dma, task->data_count,
 429                         DMA_TO_DEVICE);
 430
 431                 tx_dsg->addr    = iser_conn->ib_conn->login_req_dma;
 432                 tx_dsg->length  = task->data_count;
 433                 tx_dsg->lkey    = device->mr->lkey;
 434                 mdesc->num_sge = 2;
 435         }
 436
 437         if (task == conn->login_task) {
 438                 err = iser_post_recvl(iser_conn->ib_conn);
 439                 if (err)
 440                         goto send_control_error;
 441         }
 442
 443         err = iser_post_send(iser_conn->ib_conn, mdesc);
 444         if (!err)
 445                 return 0;
 446
 447 send_control_error:
 448         iser_err("conn %p failed err %d\n",conn, err);
 449         return err;
 450 }
 451
 452 /**
 453  * iser_rcv_dto_completion - recv DTO completion
 454  */
 455 void iser_rcv_completion(struct iser_rx_desc *rx_desc,
 456                          unsigned long rx_xfer_len,
 457                          struct iser_conn *ib_conn)
 458 {
 459         struct iscsi_iser_conn *conn = ib_conn->iser_conn;
 460         struct iscsi_hdr *hdr;
 461         u64 rx_dma;
 462         int rx_buflen, outstanding, count, err;
 463
 464         /* differentiate between login to all other PDUs */
 465         if ((char *)rx_desc == ib_conn->login_resp_buf) {
 466                 rx_dma = ib_conn->login_resp_dma;
 467                 rx_buflen = ISER_RX_LOGIN_SIZE;
 468         } else {
 469                 rx_dma = rx_desc->dma_addr;
 470                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
 471         }
 472
 473         ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
 474                         rx_buflen, DMA_FROM_DEVICE);
 475
 476         hdr = &rx_desc->iscsi_header;
 477
 478         iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
 479                         hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
 480
 481         iscsi_iser_recv(conn->iscsi_conn, hdr,
 482                 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
 483
 484         ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
 485                         rx_buflen, DMA_FROM_DEVICE);
 486
 487         /* decrementing conn->post_recv_buf_count only --after-- freeing the   *
 488          * task eliminates the need to worry on tasks which are completed in   *
 489          * parallel to the execution of iser_conn_term. So the code that waits *
 490          * for the posted rx bufs refcount to become zero handles everything   */
 491         conn->ib_conn->post_recv_buf_count--;
 492
 493         if (rx_dma == ib_conn->login_resp_dma)
 494                 return;
 495
 496         outstanding = ib_conn->post_recv_buf_count;
 497         if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
 498                 count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
 499                                                 ISER_MIN_POSTED_RX);
 500                 err = iser_post_recvm(ib_conn, count);
 501                 if (err)
 502                         iser_err("posting %d rx bufs err %d\n", count, err);
 503         }
 504 }
 505
 506 void iser_snd_completion(struct iser_tx_desc *tx_desc,
 507                         struct iser_conn *ib_conn)
 508 {
 509         struct iscsi_task *task;
 510         struct iser_device *device = ib_conn->device;
 511
 512         if (tx_desc->type == ISCSI_TX_DATAOUT) {
 513                 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
 514                                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 515                 kmem_cache_free(ig.desc_cache, tx_desc);
 516         }
 517
 518         atomic_dec(&ib_conn->post_send_buf_count);
 519
 520         if (tx_desc->type == ISCSI_TX_CONTROL) {
 521                 /* this arithmetic is legal by libiscsi dd_data allocation */
 522                 task = (void *) ((long)(void *)tx_desc -
 523                                   sizeof(struct iscsi_task));
 524                 if (task->hdr->itt == RESERVED_ITT)
 525                         iscsi_put_task(task);
 526         }
 527 }
 528
 529 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
 530
 531 {
 532         iser_task->status = ISER_TASK_STATUS_INIT;
 533
 534         iser_task->dir[ISER_DIR_IN] = 0;
 535         iser_task->dir[ISER_DIR_OUT] = 0;
 536
 537         iser_task->data[ISER_DIR_IN].data_len  = 0;
 538         iser_task->data[ISER_DIR_OUT].data_len = 0;
 539
 540         memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
 541                sizeof(struct iser_regd_buf));
 542         memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
 543                sizeof(struct iser_regd_buf));
 544 }
 545
 546 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
 547 {
 548         int is_rdma_aligned = 1;
 549         struct iser_regd_buf *regd;
 550
 551         /* if we were reading, copy back to unaligned sglist,
 552          * anyway dma_unmap and free the copy
 553          */
 554         if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
 555                 is_rdma_aligned = 0;
 556                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
 557         }
 558         if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
 559                 is_rdma_aligned = 0;
 560                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
 561         }
 562
 563         if (iser_task->dir[ISER_DIR_IN]) {
 564                 regd = &iser_task->rdma_regd[ISER_DIR_IN];
 565                 if (regd->reg.is_fmr)
 566                         iser_unreg_mem(&regd->reg);
 567         }
 568
 569         if (iser_task->dir[ISER_DIR_OUT]) {
 570                 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
 571                 if (regd->reg.is_fmr)
 572                         iser_unreg_mem(&regd->reg);
 573         }
 574
 575        /* if the data was unaligned, it was already unmapped and then copied */
 576        if (is_rdma_aligned)
 577                 iser_dma_unmap_task_data(iser_task);
 578 }