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 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 static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req)
 246 {
 247         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 248
 249         iser_dbg("req op %x flags %x\n", req->opcode, req->flags);
 250         /* check if this is the last login - going to full feature phase */
 251         if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE)
 252                 return 0;
 253
 254         /*
 255          * Check that there is one posted recv buffer (for the last login
 256          * response) and no posted send buffers left - they must have been
 257          * consumed during previous login phases.
 258          */
 259         WARN_ON(iser_conn->ib_conn->post_recv_buf_count != 1);
 260         WARN_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
 261
 262         iser_dbg("Initially post: %d\n", ISER_MIN_POSTED_RX);
 263         /* Initial post receive buffers */
 264         if (iser_post_recvm(iser_conn->ib_conn, ISER_MIN_POSTED_RX))
 265                 return -ENOMEM;
 266
 267         return 0;
 268 }
 269
 270 /**
 271  * iser_send_command - send command PDU
 272  */
 273 int iser_send_command(struct iscsi_conn *conn,
 274                       struct iscsi_task *task)
 275 {
 276         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 277         struct iscsi_iser_task *iser_task = task->dd_data;
 278         unsigned long edtl;
 279         int err;
 280         struct iser_data_buf *data_buf;
 281         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr;
 282         struct scsi_cmnd *sc  =  task->sc;
 283         struct iser_tx_desc *tx_desc = &iser_task->desc;
 284
 285         edtl = ntohl(hdr->data_length);
 286
 287         /* build the tx desc regd header and add it to the tx desc dto */
 288         tx_desc->type = ISCSI_TX_SCSI_COMMAND;
 289         iser_create_send_desc(iser_conn->ib_conn, tx_desc);
 290
 291         if (hdr->flags & ISCSI_FLAG_CMD_READ)
 292                 data_buf = &iser_task->data[ISER_DIR_IN];
 293         else
 294                 data_buf = &iser_task->data[ISER_DIR_OUT];
 295
 296         if (scsi_sg_count(sc)) { /* using a scatter list */
 297                 data_buf->buf  = scsi_sglist(sc);
 298                 data_buf->size = scsi_sg_count(sc);
 299         }
 300
 301         data_buf->data_len = scsi_bufflen(sc);
 302
 303         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 304                 err = iser_prepare_read_cmd(task, edtl);
 305                 if (err)
 306                         goto send_command_error;
 307         }
 308         if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
 309                 err = iser_prepare_write_cmd(task,
 310                                              task->imm_count,
 311                                              task->imm_count +
 312                                              task->unsol_r2t.data_length,
 313                                              edtl);
 314                 if (err)
 315                         goto send_command_error;
 316         }
 317
 318         iser_task->status = ISER_TASK_STATUS_STARTED;
 319
 320         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 321         if (!err)
 322                 return 0;
 323
 324 send_command_error:
 325         iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err);
 326         return err;
 327 }
 328
 329 /**
 330  * iser_send_data_out - send data out PDU
 331  */
 332 int iser_send_data_out(struct iscsi_conn *conn,
 333                        struct iscsi_task *task,
 334                        struct iscsi_data *hdr)
 335 {
 336         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 337         struct iscsi_iser_task *iser_task = task->dd_data;
 338         struct iser_tx_desc *tx_desc = NULL;
 339         struct iser_regd_buf *regd_buf;
 340         unsigned long buf_offset;
 341         unsigned long data_seg_len;
 342         uint32_t itt;
 343         int err = 0;
 344         struct ib_sge *tx_dsg;
 345
 346         itt = (__force uint32_t)hdr->itt;
 347         data_seg_len = ntoh24(hdr->dlength);
 348         buf_offset   = ntohl(hdr->offset);
 349
 350         iser_dbg("%s itt %d dseg_len %d offset %d\n",
 351                  __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
 352
 353         tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC);
 354         if (tx_desc == NULL) {
 355                 iser_err("Failed to alloc desc for post dataout\n");
 356                 return -ENOMEM;
 357         }
 358
 359         tx_desc->type = ISCSI_TX_DATAOUT;
 360         tx_desc->iser_header.flags = ISER_VER;
 361         memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
 362
 363         /* build the tx desc */
 364         iser_initialize_task_headers(task, tx_desc);
 365
 366         regd_buf = &iser_task->rdma_regd[ISER_DIR_OUT];
 367         tx_dsg = &tx_desc->tx_sg[1];
 368         tx_dsg->addr    = regd_buf->reg.va + buf_offset;
 369         tx_dsg->length  = data_seg_len;
 370         tx_dsg->lkey    = regd_buf->reg.lkey;
 371         tx_desc->num_sge = 2;
 372
 373         if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) {
 374                 iser_err("Offset:%ld & DSL:%ld in Data-Out "
 375                          "inconsistent with total len:%ld, itt:%d\n",
 376                          buf_offset, data_seg_len,
 377                          iser_task->data[ISER_DIR_OUT].data_len, itt);
 378                 err = -EINVAL;
 379                 goto send_data_out_error;
 380         }
 381         iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
 382                  itt, buf_offset, data_seg_len);
 383
 384
 385         err = iser_post_send(iser_conn->ib_conn, tx_desc);
 386         if (!err)
 387                 return 0;
 388
 389 send_data_out_error:
 390         kmem_cache_free(ig.desc_cache, tx_desc);
 391         iser_err("conn %p failed err %d\n",conn, err);
 392         return err;
 393 }
 394
 395 int iser_send_control(struct iscsi_conn *conn,
 396                       struct iscsi_task *task)
 397 {
 398         struct iscsi_iser_conn *iser_conn = conn->dd_data;
 399         struct iscsi_iser_task *iser_task = task->dd_data;
 400         struct iser_tx_desc *mdesc = &iser_task->desc;
 401         unsigned long data_seg_len;
 402         int err = 0;
 403         struct iser_device *device;
 404         struct iser_conn *ib_conn = iser_conn->ib_conn;
 405
 406         /* build the tx desc regd header and add it to the tx desc dto */
 407         mdesc->type = ISCSI_TX_CONTROL;
 408         iser_create_send_desc(iser_conn->ib_conn, mdesc);
 409
 410         device = iser_conn->ib_conn->device;
 411
 412         data_seg_len = ntoh24(task->hdr->dlength);
 413
 414         if (data_seg_len > 0) {
 415                 struct ib_sge *tx_dsg = &mdesc->tx_sg[1];
 416                 if (task != conn->login_task) {
 417                         iser_err("data present on non login task!!!\n");
 418                         goto send_control_error;
 419                 }
 420
 421                 ib_dma_sync_single_for_cpu(device->ib_device,
 422                         ib_conn->login_req_dma, task->data_count,
 423                         DMA_TO_DEVICE);
 424
 425                 memcpy(iser_conn->ib_conn->login_req_buf, task->data,
 426                                                         task->data_count);
 427
 428                 ib_dma_sync_single_for_device(device->ib_device,
 429                         ib_conn->login_req_dma, task->data_count,
 430                         DMA_TO_DEVICE);
 431
 432                 tx_dsg->addr    = iser_conn->ib_conn->login_req_dma;
 433                 tx_dsg->length  = task->data_count;
 434                 tx_dsg->lkey    = device->mr->lkey;
 435                 mdesc->num_sge = 2;
 436         }
 437
 438         if (task == conn->login_task) {
 439                 err = iser_post_recvl(iser_conn->ib_conn);
 440                 if (err)
 441                         goto send_control_error;
 442                 err = iser_post_rx_bufs(conn, task->hdr);
 443                 if (err)
 444                         goto send_control_error;
 445         }
 446
 447         err = iser_post_send(iser_conn->ib_conn, mdesc);
 448         if (!err)
 449                 return 0;
 450
 451 send_control_error:
 452         iser_err("conn %p failed err %d\n",conn, err);
 453         return err;
 454 }
 455
 456 /**
 457  * iser_rcv_dto_completion - recv DTO completion
 458  */
 459 void iser_rcv_completion(struct iser_rx_desc *rx_desc,
 460                          unsigned long rx_xfer_len,
 461                          struct iser_conn *ib_conn)
 462 {
 463         struct iscsi_iser_conn *conn = ib_conn->iser_conn;
 464         struct iscsi_hdr *hdr;
 465         u64 rx_dma;
 466         int rx_buflen, outstanding, count, err;
 467
 468         /* differentiate between login to all other PDUs */
 469         if ((char *)rx_desc == ib_conn->login_resp_buf) {
 470                 rx_dma = ib_conn->login_resp_dma;
 471                 rx_buflen = ISER_RX_LOGIN_SIZE;
 472         } else {
 473                 rx_dma = rx_desc->dma_addr;
 474                 rx_buflen = ISER_RX_PAYLOAD_SIZE;
 475         }
 476
 477         ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, rx_dma,
 478                         rx_buflen, DMA_FROM_DEVICE);
 479
 480         hdr = &rx_desc->iscsi_header;
 481
 482         iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode,
 483                         hdr->itt, (int)(rx_xfer_len - ISER_HEADERS_LEN));
 484
 485         iscsi_iser_recv(conn->iscsi_conn, hdr,
 486                 rx_desc->data, rx_xfer_len - ISER_HEADERS_LEN);
 487
 488         ib_dma_sync_single_for_device(ib_conn->device->ib_device, rx_dma,
 489                         rx_buflen, DMA_FROM_DEVICE);
 490
 491         /* decrementing conn->post_recv_buf_count only --after-- freeing the   *
 492          * task eliminates the need to worry on tasks which are completed in   *
 493          * parallel to the execution of iser_conn_term. So the code that waits *
 494          * for the posted rx bufs refcount to become zero handles everything   */
 495         conn->ib_conn->post_recv_buf_count--;
 496
 497         if (rx_dma == ib_conn->login_resp_dma)
 498                 return;
 499
 500         outstanding = ib_conn->post_recv_buf_count;
 501         if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
 502                 count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
 503                                                 ISER_MIN_POSTED_RX);
 504                 err = iser_post_recvm(ib_conn, count);
 505                 if (err)
 506                         iser_err("posting %d rx bufs err %d\n", count, err);
 507         }
 508 }
 509
 510 void iser_snd_completion(struct iser_tx_desc *tx_desc,
 511                         struct iser_conn *ib_conn)
 512 {
 513         struct iscsi_task *task;
 514         struct iser_device *device = ib_conn->device;
 515
 516         if (tx_desc->type == ISCSI_TX_DATAOUT) {
 517                 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
 518                                         ISER_HEADERS_LEN, DMA_TO_DEVICE);
 519                 kmem_cache_free(ig.desc_cache, tx_desc);
 520         }
 521
 522         atomic_dec(&ib_conn->post_send_buf_count);
 523
 524         if (tx_desc->type == ISCSI_TX_CONTROL) {
 525                 /* this arithmetic is legal by libiscsi dd_data allocation */
 526                 task = (void *) ((long)(void *)tx_desc -
 527                                   sizeof(struct iscsi_task));
 528                 if (task->hdr->itt == RESERVED_ITT)
 529                         iscsi_put_task(task);
 530         }
 531 }
 532
 533 void iser_task_rdma_init(struct iscsi_iser_task *iser_task)
 534
 535 {
 536         iser_task->status = ISER_TASK_STATUS_INIT;
 537
 538         iser_task->dir[ISER_DIR_IN] = 0;
 539         iser_task->dir[ISER_DIR_OUT] = 0;
 540
 541         iser_task->data[ISER_DIR_IN].data_len  = 0;
 542         iser_task->data[ISER_DIR_OUT].data_len = 0;
 543
 544         memset(&iser_task->rdma_regd[ISER_DIR_IN], 0,
 545                sizeof(struct iser_regd_buf));
 546         memset(&iser_task->rdma_regd[ISER_DIR_OUT], 0,
 547                sizeof(struct iser_regd_buf));
 548 }
 549
 550 void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task)
 551 {
 552         int is_rdma_aligned = 1;
 553         struct iser_regd_buf *regd;
 554
 555         /* if we were reading, copy back to unaligned sglist,
 556          * anyway dma_unmap and free the copy
 557          */
 558         if (iser_task->data_copy[ISER_DIR_IN].copy_buf != NULL) {
 559                 is_rdma_aligned = 0;
 560                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_IN);
 561         }
 562         if (iser_task->data_copy[ISER_DIR_OUT].copy_buf != NULL) {
 563                 is_rdma_aligned = 0;
 564                 iser_finalize_rdma_unaligned_sg(iser_task, ISER_DIR_OUT);
 565         }
 566
 567         if (iser_task->dir[ISER_DIR_IN]) {
 568                 regd = &iser_task->rdma_regd[ISER_DIR_IN];
 569                 if (regd->reg.is_fmr)
 570                         iser_unreg_mem(&regd->reg);
 571         }
 572
 573         if (iser_task->dir[ISER_DIR_OUT]) {
 574                 regd = &iser_task->rdma_regd[ISER_DIR_OUT];
 575                 if (regd->reg.is_fmr)
 576                         iser_unreg_mem(&regd->reg);
 577         }
 578
 579        /* if the data was unaligned, it was already unmapped and then copied */
 580        if (is_rdma_aligned)
 581                 iser_dma_unmap_task_data(iser_task);
 582 }