drivers/target/target_core_xcopy.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * Filename: target_core_xcopy.c
   4  *
   5  * This file contains support for SPC-4 Extended-Copy offload with generic
   6  * TCM backends.
   7  *
   8  * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
   9  *
  10  * Author:
  11  * Nicholas A. Bellinger <nab@daterainc.com>
  12  *
  13  ******************************************************************************/
  14
  15 #include <linux/slab.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/list.h>
  18 #include <linux/configfs.h>
  19 #include <linux/ratelimit.h>
  20 #include <scsi/scsi_proto.h>
  21 #include <asm/unaligned.h>
  22
  23 #include <target/target_core_base.h>
  24 #include <target/target_core_backend.h>
  25 #include <target/target_core_fabric.h>
  26
  27 #include "target_core_internal.h"
  28 #include "target_core_pr.h"
  29 #include "target_core_ua.h"
  30 #include "target_core_xcopy.h"
  31
  32 static struct workqueue_struct *xcopy_wq = NULL;
  33
  34 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop);
  35
  36 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  37 {
  38         int off = 0;
  39
  40         buf[off++] = (0x6 << 4);
  41         buf[off++] = 0x01;
  42         buf[off++] = 0x40;
  43         buf[off] = (0x5 << 4);
  44
  45         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  46         return 0;
  47 }
  48
  49 struct xcopy_dev_search_info {
  50         const unsigned char *dev_wwn;
  51         struct se_device *found_dev;
  52 };
  53
  54 static int target_xcopy_locate_se_dev_e4_iter(struct se_device *se_dev,
  55                                               void *data)
  56 {
  57         struct xcopy_dev_search_info *info = data;
  58         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN];
  59         int rc;
  60
  61         if (!se_dev->dev_attrib.emulate_3pc)
  62                 return 0;
  63
  64         memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  65         target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  66
  67         rc = memcmp(&tmp_dev_wwn[0], info->dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  68         if (rc != 0)
  69                 return 0;
  70
  71         info->found_dev = se_dev;
  72         pr_debug("XCOPY 0xe4: located se_dev: %p\n", se_dev);
  73
  74         rc = target_depend_item(&se_dev->dev_group.cg_item);
  75         if (rc != 0) {
  76                 pr_err("configfs_depend_item attempt failed: %d for se_dev: %p\n",
  77                        rc, se_dev);
  78                 return rc;
  79         }
  80
  81         pr_debug("Called configfs_depend_item for se_dev: %p se_dev->se_dev_group: %p\n",
  82                  se_dev, &se_dev->dev_group);
  83         return 1;
  84 }
  85
  86 static int target_xcopy_locate_se_dev_e4(const unsigned char *dev_wwn,
  87                                         struct se_device **found_dev)
  88 {
  89         struct xcopy_dev_search_info info;
  90         int ret;
  91
  92         memset(&info, 0, sizeof(info));
  93         info.dev_wwn = dev_wwn;
  94
  95         ret = target_for_each_device(target_xcopy_locate_se_dev_e4_iter, &info);
  96         if (ret == 1) {
  97                 *found_dev = info.found_dev;
  98                 return 0;
  99         } else {
 100                 pr_debug_ratelimited("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 101                 return -EINVAL;
 102         }
 103 }
 104
 105 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 106                                 unsigned char *p, unsigned short cscd_index)
 107 {
 108         unsigned char *desc = p;
 109         unsigned short ript;
 110         u8 desig_len;
 111         /*
 112          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 113          */
 114         ript = get_unaligned_be16(&desc[2]);
 115         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 116         /*
 117          * Check for supported code set, association, and designator type
 118          */
 119         if ((desc[4] & 0x0f) != 0x1) {
 120                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 121                 return -EINVAL;
 122         }
 123         if ((desc[5] & 0x30) != 0x00) {
 124                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 125                 return -EINVAL;
 126         }
 127         if ((desc[5] & 0x0f) != 0x3) {
 128                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 129                                 (desc[5] & 0x0f));
 130                 return -EINVAL;
 131         }
 132         /*
 133          * Check for matching 16 byte length for NAA IEEE Registered Extended
 134          * Assigned designator
 135          */
 136         desig_len = desc[7];
 137         if (desig_len != XCOPY_NAA_IEEE_REGEX_LEN) {
 138                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 139                 return -EINVAL;
 140         }
 141         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 142         /*
 143          * Check for NAA IEEE Registered Extended Assigned header..
 144          */
 145         if ((desc[8] & 0xf0) != 0x60) {
 146                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 147                                         (desc[8] & 0xf0));
 148                 return -EINVAL;
 149         }
 150
 151         if (cscd_index != xop->stdi && cscd_index != xop->dtdi) {
 152                 pr_debug("XCOPY 0xe4: ignoring CSCD entry %d - neither src nor "
 153                          "dest\n", cscd_index);
 154                 return 0;
 155         }
 156
 157         if (cscd_index == xop->stdi) {
 158                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 159                 /*
 160                  * Determine if the source designator matches the local device
 161                  */
 162                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 163                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 164                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 165                         xop->src_dev = se_cmd->se_dev;
 166                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 167                                         " received xop\n", xop->src_dev);
 168                 }
 169         }
 170
 171         if (cscd_index == xop->dtdi) {
 172                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 173                 /*
 174                  * Determine if the destination designator matches the local
 175                  * device. If @cscd_index corresponds to both source (stdi) and
 176                  * destination (dtdi), or dtdi comes after stdi, then
 177                  * XCOL_DEST_RECV_OP wins.
 178                  */
 179                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 180                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 181                         xop->op_origin = XCOL_DEST_RECV_OP;
 182                         xop->dst_dev = se_cmd->se_dev;
 183                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 184                                 " received xop\n", xop->dst_dev);
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 192                                 struct xcopy_op *xop, unsigned char *p,
 193                                 unsigned short tdll, sense_reason_t *sense_ret)
 194 {
 195         struct se_device *local_dev = se_cmd->se_dev;
 196         unsigned char *desc = p;
 197         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc;
 198         unsigned short cscd_index = 0;
 199         unsigned short start = 0;
 200
 201         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 202
 203         if (offset != 0) {
 204                 pr_err("XCOPY target descriptor list length is not"
 205                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 206                 *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 207                 return -EINVAL;
 208         }
 209         if (tdll > RCR_OP_MAX_TARGET_DESC_COUNT * XCOPY_TARGET_DESC_LEN) {
 210                 pr_err("XCOPY target descriptor supports a maximum"
 211                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 212                 /* spc4r37 6.4.3.4 CSCD DESCRIPTOR LIST LENGTH field */
 213                 *sense_ret = TCM_TOO_MANY_TARGET_DESCS;
 214                 return -EINVAL;
 215         }
 216         /*
 217          * Generate an IEEE Registered Extended designator based upon the
 218          * se_device the XCOPY was received upon..
 219          */
 220         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 221         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 222
 223         while (start < tdll) {
 224                 /*
 225                  * Check target descriptor identification with 0xE4 type, and
 226                  * compare the current index with the CSCD descriptor IDs in
 227                  * the segment descriptor. Use VPD 0x83 WWPN matching ..
 228                  */
 229                 switch (desc[0]) {
 230                 case 0xe4:
 231                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 232                                                         &desc[0], cscd_index);
 233                         if (rc != 0)
 234                                 goto out;
 235                         start += XCOPY_TARGET_DESC_LEN;
 236                         desc += XCOPY_TARGET_DESC_LEN;
 237                         cscd_index++;
 238                         break;
 239                 default:
 240                         pr_err("XCOPY unsupported descriptor type code:"
 241                                         " 0x%02x\n", desc[0]);
 242                         *sense_ret = TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE;
 243                         goto out;
 244                 }
 245         }
 246
 247         switch (xop->op_origin) {
 248         case XCOL_SOURCE_RECV_OP:
 249                 rc = target_xcopy_locate_se_dev_e4(xop->dst_tid_wwn,
 250                                                 &xop->dst_dev);
 251                 break;
 252         case XCOL_DEST_RECV_OP:
 253                 rc = target_xcopy_locate_se_dev_e4(xop->src_tid_wwn,
 254                                                 &xop->src_dev);
 255                 break;
 256         default:
 257                 pr_err("XCOPY CSCD descriptor IDs not found in CSCD list - "
 258                         "stdi: %hu dtdi: %hu\n", xop->stdi, xop->dtdi);
 259                 rc = -EINVAL;
 260                 break;
 261         }
 262         /*
 263          * If a matching IEEE NAA 0x83 descriptor for the requested device
 264          * is not located on this node, return COPY_ABORTED with ASQ/ASQC
 265          * 0x0d/0x02 - COPY_TARGET_DEVICE_NOT_REACHABLE to request the
 266          * initiator to fall back to normal copy method.
 267          */
 268         if (rc < 0) {
 269                 *sense_ret = TCM_COPY_TARGET_DEVICE_NOT_REACHABLE;
 270                 goto out;
 271         }
 272
 273         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 274                  xop->src_dev, &xop->src_tid_wwn[0]);
 275         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 276                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 277
 278         return cscd_index;
 279
 280 out:
 281         return -EINVAL;
 282 }
 283
 284 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 285                                         unsigned char *p)
 286 {
 287         unsigned char *desc = p;
 288         int dc = (desc[1] & 0x02);
 289         unsigned short desc_len;
 290
 291         desc_len = get_unaligned_be16(&desc[2]);
 292         if (desc_len != 0x18) {
 293                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 294                                 " %hu\n", desc_len);
 295                 return -EINVAL;
 296         }
 297
 298         xop->stdi = get_unaligned_be16(&desc[4]);
 299         xop->dtdi = get_unaligned_be16(&desc[6]);
 300
 301         if (xop->stdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX ||
 302             xop->dtdi > XCOPY_CSCD_DESC_ID_LIST_OFF_MAX) {
 303                 pr_err("XCOPY segment desc 0x02: unsupported CSCD ID > 0x%x; stdi: %hu dtdi: %hu\n",
 304                         XCOPY_CSCD_DESC_ID_LIST_OFF_MAX, xop->stdi, xop->dtdi);
 305                 return -EINVAL;
 306         }
 307
 308         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 309                 desc_len, xop->stdi, xop->dtdi, dc);
 310
 311         xop->nolb = get_unaligned_be16(&desc[10]);
 312         xop->src_lba = get_unaligned_be64(&desc[12]);
 313         xop->dst_lba = get_unaligned_be64(&desc[20]);
 314         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 315                 xop->nolb, (unsigned long long)xop->src_lba,
 316                 (unsigned long long)xop->dst_lba);
 317
 318         return 0;
 319 }
 320
 321 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 322                                 struct xcopy_op *xop, unsigned char *p,
 323                                 unsigned int sdll, sense_reason_t *sense_ret)
 324 {
 325         unsigned char *desc = p;
 326         unsigned int start = 0;
 327         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 328
 329         *sense_ret = TCM_INVALID_PARAMETER_LIST;
 330
 331         if (offset != 0) {
 332                 pr_err("XCOPY segment descriptor list length is not"
 333                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 334                 *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 335                 return -EINVAL;
 336         }
 337         if (sdll > RCR_OP_MAX_SG_DESC_COUNT * XCOPY_SEGMENT_DESC_LEN) {
 338                 pr_err("XCOPY supports %u segment descriptor(s), sdll: %u too"
 339                         " large..\n", RCR_OP_MAX_SG_DESC_COUNT, sdll);
 340                 /* spc4r37 6.4.3.5 SEGMENT DESCRIPTOR LIST LENGTH field */
 341                 *sense_ret = TCM_TOO_MANY_SEGMENT_DESCS;
 342                 return -EINVAL;
 343         }
 344
 345         while (start < sdll) {
 346                 /*
 347                  * Check segment descriptor type code for block -> block
 348                  */
 349                 switch (desc[0]) {
 350                 case 0x02:
 351                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 352                         if (rc < 0)
 353                                 goto out;
 354
 355                         ret++;
 356                         start += XCOPY_SEGMENT_DESC_LEN;
 357                         desc += XCOPY_SEGMENT_DESC_LEN;
 358                         break;
 359                 default:
 360                         pr_err("XCOPY unsupported segment descriptor"
 361                                 "type: 0x%02x\n", desc[0]);
 362                         *sense_ret = TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE;
 363                         goto out;
 364                 }
 365         }
 366
 367         return ret;
 368
 369 out:
 370         return -EINVAL;
 371 }
 372
 373 /*
 374  * Start xcopy_pt ops
 375  */
 376
 377 struct xcopy_pt_cmd {
 378         struct se_cmd se_cmd;
 379         struct completion xpt_passthrough_sem;
 380         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 381 };
 382
 383 struct se_portal_group xcopy_pt_tpg;
 384 static struct se_session xcopy_pt_sess;
 385 static struct se_node_acl xcopy_pt_nacl;
 386
 387 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 388 {
 389         return 0;
 390 }
 391
 392 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 393 {
 394         struct se_device *remote_dev;
 395
 396         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 397                 remote_dev = xop->dst_dev;
 398         else
 399                 remote_dev = xop->src_dev;
 400
 401         pr_debug("Calling configfs_undepend_item for"
 402                   " remote_dev: %p remote_dev->dev_group: %p\n",
 403                   remote_dev, &remote_dev->dev_group.cg_item);
 404
 405         target_undepend_item(&remote_dev->dev_group.cg_item);
 406 }
 407
 408 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 409 {
 410         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 411                                 struct xcopy_pt_cmd, se_cmd);
 412
 413         /* xpt_cmd is on the stack, nothing to free here */
 414         pr_debug("xpt_cmd done: %p\n", xpt_cmd);
 415 }
 416
 417 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 418 {
 419         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 420                                 struct xcopy_pt_cmd, se_cmd);
 421
 422         complete(&xpt_cmd->xpt_passthrough_sem);
 423         return 0;
 424 }
 425
 426 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 427 {
 428         return 0;
 429 }
 430
 431 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 432 {
 433         return 0;
 434 }
 435
 436 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 437 {
 438         return 0;
 439 }
 440
 441 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 442         .fabric_name            = "xcopy-pt",
 443         .get_cmd_state          = xcopy_pt_get_cmd_state,
 444         .release_cmd            = xcopy_pt_release_cmd,
 445         .check_stop_free        = xcopy_pt_check_stop_free,
 446         .write_pending          = xcopy_pt_write_pending,
 447         .queue_data_in          = xcopy_pt_queue_data_in,
 448         .queue_status           = xcopy_pt_queue_status,
 449 };
 450
 451 /*
 452  * End xcopy_pt_ops
 453  */
 454
 455 int target_xcopy_setup_pt(void)
 456 {
 457         int ret;
 458
 459         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 460         if (!xcopy_wq) {
 461                 pr_err("Unable to allocate xcopy_wq\n");
 462                 return -ENOMEM;
 463         }
 464
 465         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 466         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 467         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 468
 469         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 470
 471         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 472         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 473         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 474         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 475         ret = transport_init_session(&xcopy_pt_sess);
 476         if (ret < 0)
 477                 goto destroy_wq;
 478
 479         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 480         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 481
 482         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 483         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 484
 485         return 0;
 486
 487 destroy_wq:
 488         destroy_workqueue(xcopy_wq);
 489         xcopy_wq = NULL;
 490         return ret;
 491 }
 492
 493 void target_xcopy_release_pt(void)
 494 {
 495         if (xcopy_wq) {
 496                 destroy_workqueue(xcopy_wq);
 497                 transport_uninit_session(&xcopy_pt_sess);
 498         }
 499 }
 500
 501 /*
 502  * target_xcopy_setup_pt_cmd - set up a pass-through command
 503  * @xpt_cmd:     Data structure to initialize.
 504  * @xop:         Describes the XCOPY operation received from an initiator.
 505  * @se_dev:      Backend device to associate with @xpt_cmd if
 506  *               @remote_port == true.
 507  * @cdb:         SCSI CDB to be copied into @xpt_cmd.
 508  * @remote_port: If false, use the LUN through which the XCOPY command has
 509  *               been received. If true, use @se_dev->xcopy_lun.
 510  *
 511  * Set up a SCSI command (READ or WRITE) that will be used to execute an
 512  * XCOPY command.
 513  */
 514 static int target_xcopy_setup_pt_cmd(
 515         struct xcopy_pt_cmd *xpt_cmd,
 516         struct xcopy_op *xop,
 517         struct se_device *se_dev,
 518         unsigned char *cdb,
 519         bool remote_port)
 520 {
 521         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 522
 523         /*
 524          * Setup LUN+port to honor reservations based upon xop->op_origin for
 525          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 526          */
 527         if (remote_port) {
 528                 cmd->se_lun = &se_dev->xcopy_lun;
 529                 cmd->se_dev = se_dev;
 530         } else {
 531                 cmd->se_lun = xop->xop_se_cmd->se_lun;
 532                 cmd->se_dev = xop->xop_se_cmd->se_dev;
 533         }
 534         cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 535
 536         if (target_cmd_init_cdb(cmd, cdb))
 537                 return -EINVAL;
 538
 539         cmd->tag = 0;
 540         if (target_cmd_parse_cdb(cmd))
 541                 return -EINVAL;
 542
 543         if (transport_generic_map_mem_to_cmd(cmd, xop->xop_data_sg,
 544                                         xop->xop_data_nents, NULL, 0))
 545                 return -EINVAL;
 546
 547         pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 548                  " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 549
 550         return 0;
 551 }
 552
 553 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 554 {
 555         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 556         sense_reason_t sense_rc;
 557
 558         sense_rc = transport_generic_new_cmd(se_cmd);
 559         if (sense_rc)
 560                 return -EINVAL;
 561
 562         if (se_cmd->data_direction == DMA_TO_DEVICE)
 563                 target_execute_cmd(se_cmd);
 564
 565         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 566
 567         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 568                         se_cmd->scsi_status);
 569
 570         return (se_cmd->scsi_status) ? -EINVAL : 0;
 571 }
 572
 573 static int target_xcopy_read_source(
 574         struct se_cmd *ec_cmd,
 575         struct xcopy_op *xop,
 576         struct se_device *src_dev,
 577         sector_t src_lba,
 578         u32 src_sectors)
 579 {
 580         struct xcopy_pt_cmd xpt_cmd;
 581         struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
 582         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 583         int rc;
 584         unsigned char cdb[16];
 585         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 586
 587         memset(&xpt_cmd, 0, sizeof(xpt_cmd));
 588         init_completion(&xpt_cmd.xpt_passthrough_sem);
 589
 590         memset(&cdb[0], 0, 16);
 591         cdb[0] = READ_16;
 592         put_unaligned_be64(src_lba, &cdb[2]);
 593         put_unaligned_be32(src_sectors, &cdb[10]);
 594         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 595                 (unsigned long long)src_lba, src_sectors, length);
 596
 597         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 598                               DMA_FROM_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
 599
 600         rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, src_dev, &cdb[0],
 601                                 remote_port);
 602         if (rc < 0) {
 603                 ec_cmd->scsi_status = se_cmd->scsi_status;
 604                 goto out;
 605         }
 606
 607         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 608                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 609
 610         rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
 611         if (rc < 0)
 612                 ec_cmd->scsi_status = se_cmd->scsi_status;
 613 out:
 614         transport_generic_free_cmd(se_cmd, 0);
 615         return rc;
 616 }
 617
 618 static int target_xcopy_write_destination(
 619         struct se_cmd *ec_cmd,
 620         struct xcopy_op *xop,
 621         struct se_device *dst_dev,
 622         sector_t dst_lba,
 623         u32 dst_sectors)
 624 {
 625         struct xcopy_pt_cmd xpt_cmd;
 626         struct se_cmd *se_cmd = &xpt_cmd.se_cmd;
 627         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 628         int rc;
 629         unsigned char cdb[16];
 630         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 631
 632         memset(&xpt_cmd, 0, sizeof(xpt_cmd));
 633         init_completion(&xpt_cmd.xpt_passthrough_sem);
 634
 635         memset(&cdb[0], 0, 16);
 636         cdb[0] = WRITE_16;
 637         put_unaligned_be64(dst_lba, &cdb[2]);
 638         put_unaligned_be32(dst_sectors, &cdb[10]);
 639         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 640                 (unsigned long long)dst_lba, dst_sectors, length);
 641
 642         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, &xcopy_pt_sess, length,
 643                               DMA_TO_DEVICE, 0, &xpt_cmd.sense_buffer[0], 0);
 644
 645         rc = target_xcopy_setup_pt_cmd(&xpt_cmd, xop, dst_dev, &cdb[0],
 646                                 remote_port);
 647         if (rc < 0) {
 648                 ec_cmd->scsi_status = se_cmd->scsi_status;
 649                 goto out;
 650         }
 651
 652         rc = target_xcopy_issue_pt_cmd(&xpt_cmd);
 653         if (rc < 0)
 654                 ec_cmd->scsi_status = se_cmd->scsi_status;
 655 out:
 656         transport_generic_free_cmd(se_cmd, 0);
 657         return rc;
 658 }
 659
 660 static void target_xcopy_do_work(struct work_struct *work)
 661 {
 662         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 663         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 664         struct se_device *src_dev, *dst_dev;
 665         sector_t src_lba, dst_lba, end_lba;
 666         unsigned int max_sectors;
 667         int rc = 0;
 668         unsigned short nolb, max_nolb, copied_nolb = 0;
 669
 670         if (target_parse_xcopy_cmd(xop) != TCM_NO_SENSE)
 671                 goto err_free;
 672
 673         if (WARN_ON_ONCE(!xop->src_dev) || WARN_ON_ONCE(!xop->dst_dev))
 674                 goto err_free;
 675
 676         src_dev = xop->src_dev;
 677         dst_dev = xop->dst_dev;
 678         src_lba = xop->src_lba;
 679         dst_lba = xop->dst_lba;
 680         nolb = xop->nolb;
 681         end_lba = src_lba + nolb;
 682         /*
 683          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 684          * smallest max_sectors between src_dev + dev_dev, or
 685          */
 686         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 687                           dst_dev->dev_attrib.hw_max_sectors);
 688         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 689
 690         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 691
 692         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 693                         nolb, max_nolb, (unsigned long long)end_lba);
 694         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 695                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 696
 697         while (src_lba < end_lba) {
 698                 unsigned short cur_nolb = min(nolb, max_nolb);
 699                 u32 cur_bytes = cur_nolb * src_dev->dev_attrib.block_size;
 700
 701                 if (cur_bytes != xop->xop_data_bytes) {
 702                         /*
 703                          * (Re)allocate a buffer large enough to hold the XCOPY
 704                          * I/O size, which can be reused each read / write loop.
 705                          */
 706                         target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
 707                         rc = target_alloc_sgl(&xop->xop_data_sg,
 708                                               &xop->xop_data_nents,
 709                                               cur_bytes,
 710                                               false, false);
 711                         if (rc < 0)
 712                                 goto out;
 713                         xop->xop_data_bytes = cur_bytes;
 714                 }
 715
 716                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 717                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 718
 719                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 720                 if (rc < 0)
 721                         goto out;
 722
 723                 src_lba += cur_nolb;
 724                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 725                                 (unsigned long long)src_lba);
 726
 727                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 728                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 729
 730                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 731                                                 dst_lba, cur_nolb);
 732                 if (rc < 0)
 733                         goto out;
 734
 735                 dst_lba += cur_nolb;
 736                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 737                                 (unsigned long long)dst_lba);
 738
 739                 copied_nolb += cur_nolb;
 740                 nolb -= cur_nolb;
 741         }
 742
 743         xcopy_pt_undepend_remotedev(xop);
 744         target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
 745         kfree(xop);
 746
 747         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 748                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 749         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 750                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 751
 752         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 753         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 754         return;
 755
 756 out:
 757         xcopy_pt_undepend_remotedev(xop);
 758         target_free_sgl(xop->xop_data_sg, xop->xop_data_nents);
 759
 760 err_free:
 761         kfree(xop);
 762         /*
 763          * Don't override an error scsi status if it has already been set
 764          */
 765         if (ec_cmd->scsi_status == SAM_STAT_GOOD) {
 766                 pr_warn_ratelimited("target_xcopy_do_work: rc: %d, Setting X-COPY"
 767                         " CHECK_CONDITION -> sending response\n", rc);
 768                 ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 769         }
 770         target_complete_cmd(ec_cmd, ec_cmd->scsi_status);
 771 }
 772
 773 /*
 774  * Returns TCM_NO_SENSE upon success or a sense code != TCM_NO_SENSE if parsing
 775  * fails.
 776  */
 777 static sense_reason_t target_parse_xcopy_cmd(struct xcopy_op *xop)
 778 {
 779         struct se_cmd *se_cmd = xop->xop_se_cmd;
 780         unsigned char *p = NULL, *seg_desc;
 781         unsigned int list_id, list_id_usage, sdll, inline_dl;
 782         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 783         int rc;
 784         unsigned short tdll;
 785
 786         p = transport_kmap_data_sg(se_cmd);
 787         if (!p) {
 788                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 789                 return TCM_OUT_OF_RESOURCES;
 790         }
 791
 792         list_id = p[0];
 793         list_id_usage = (p[1] & 0x18) >> 3;
 794
 795         /*
 796          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 797          */
 798         tdll = get_unaligned_be16(&p[2]);
 799         sdll = get_unaligned_be32(&p[8]);
 800         if (tdll + sdll > RCR_OP_MAX_DESC_LIST_LEN) {
 801                 pr_err("XCOPY descriptor list length %u exceeds maximum %u\n",
 802                        tdll + sdll, RCR_OP_MAX_DESC_LIST_LEN);
 803                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 804                 goto out;
 805         }
 806
 807         inline_dl = get_unaligned_be32(&p[12]);
 808         if (inline_dl != 0) {
 809                 pr_err("XCOPY with non zero inline data length\n");
 810                 goto out;
 811         }
 812
 813         if (se_cmd->data_length < (XCOPY_HDR_LEN + tdll + sdll + inline_dl)) {
 814                 pr_err("XCOPY parameter truncation: data length %u too small "
 815                         "for tdll: %hu sdll: %u inline_dl: %u\n",
 816                         se_cmd->data_length, tdll, sdll, inline_dl);
 817                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
 818                 goto out;
 819         }
 820
 821         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 822                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 823                 tdll, sdll, inline_dl);
 824
 825         /*
 826          * skip over the target descriptors until segment descriptors
 827          * have been passed - CSCD ids are needed to determine src and dest.
 828          */
 829         seg_desc = &p[16] + tdll;
 830
 831         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc,
 832                                                     sdll, &ret);
 833         if (rc <= 0)
 834                 goto out;
 835
 836         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 837                                 rc * XCOPY_SEGMENT_DESC_LEN);
 838
 839         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll, &ret);
 840         if (rc <= 0)
 841                 goto out;
 842
 843         if (xop->src_dev->dev_attrib.block_size !=
 844             xop->dst_dev->dev_attrib.block_size) {
 845                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 846                        " block_size: %u currently unsupported\n",
 847                         xop->src_dev->dev_attrib.block_size,
 848                         xop->dst_dev->dev_attrib.block_size);
 849                 xcopy_pt_undepend_remotedev(xop);
 850                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 851                 goto out;
 852         }
 853
 854         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 855                                 rc * XCOPY_TARGET_DESC_LEN);
 856         transport_kunmap_data_sg(se_cmd);
 857         return TCM_NO_SENSE;
 858
 859 out:
 860         if (p)
 861                 transport_kunmap_data_sg(se_cmd);
 862         return ret;
 863 }
 864
 865 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 866 {
 867         struct se_device *dev = se_cmd->se_dev;
 868         struct xcopy_op *xop;
 869         unsigned int sa;
 870
 871         if (!dev->dev_attrib.emulate_3pc) {
 872                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 873                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 874         }
 875
 876         sa = se_cmd->t_task_cdb[1] & 0x1f;
 877         if (sa != 0x00) {
 878                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 879                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 880         }
 881
 882         if (se_cmd->data_length == 0) {
 883                 target_complete_cmd(se_cmd, SAM_STAT_GOOD);
 884                 return TCM_NO_SENSE;
 885         }
 886         if (se_cmd->data_length < XCOPY_HDR_LEN) {
 887                 pr_err("XCOPY parameter truncation: length %u < hdr_len %u\n",
 888                                 se_cmd->data_length, XCOPY_HDR_LEN);
 889                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
 890         }
 891
 892         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 893         if (!xop)
 894                 goto err;
 895         xop->xop_se_cmd = se_cmd;
 896         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 897         if (WARN_ON_ONCE(!queue_work(xcopy_wq, &xop->xop_work)))
 898                 goto free;
 899         return TCM_NO_SENSE;
 900
 901 free:
 902         kfree(xop);
 903
 904 err:
 905         return TCM_OUT_OF_RESOURCES;
 906 }
 907
 908 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 909 {
 910         unsigned char *p;
 911
 912         p = transport_kmap_data_sg(se_cmd);
 913         if (!p) {
 914                 pr_err("transport_kmap_data_sg failed in"
 915                        " target_rcr_operating_parameters\n");
 916                 return TCM_OUT_OF_RESOURCES;
 917         }
 918
 919         if (se_cmd->data_length < 54) {
 920                 pr_err("Receive Copy Results Op Parameters length"
 921                        " too small: %u\n", se_cmd->data_length);
 922                 transport_kunmap_data_sg(se_cmd);
 923                 return TCM_INVALID_CDB_FIELD;
 924         }
 925         /*
 926          * Set SNLID=1 (Supports no List ID)
 927          */
 928         p[4] = 0x1;
 929         /*
 930          * MAXIMUM TARGET DESCRIPTOR COUNT
 931          */
 932         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 933         /*
 934          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 935          */
 936         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 937         /*
 938          * MAXIMUM DESCRIPTOR LIST LENGTH
 939          */
 940         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 941         /*
 942          * MAXIMUM SEGMENT LENGTH
 943          */
 944         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
 945         /*
 946          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
 947          */
 948         put_unaligned_be32(0x0, &p[20]);
 949         /*
 950          * HELD DATA LIMIT
 951          */
 952         put_unaligned_be32(0x0, &p[24]);
 953         /*
 954          * MAXIMUM STREAM DEVICE TRANSFER SIZE
 955          */
 956         put_unaligned_be32(0x0, &p[28]);
 957         /*
 958          * TOTAL CONCURRENT COPIES
 959          */
 960         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
 961         /*
 962          * MAXIMUM CONCURRENT COPIES
 963          */
 964         p[36] = RCR_OP_MAX_CONCURR_COPIES;
 965         /*
 966          * DATA SEGMENT GRANULARITY (log 2)
 967          */
 968         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
 969         /*
 970          * INLINE DATA GRANULARITY log 2)
 971          */
 972         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
 973         /*
 974          * HELD DATA GRANULARITY
 975          */
 976         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
 977         /*
 978          * IMPLEMENTED DESCRIPTOR LIST LENGTH
 979          */
 980         p[43] = 0x2;
 981         /*
 982          * List of implemented descriptor type codes (ordered)
 983          */
 984         p[44] = 0x02; /* Copy Block to Block device */
 985         p[45] = 0xe4; /* Identification descriptor target descriptor */
 986
 987         /*
 988          * AVAILABLE DATA (n-3)
 989          */
 990         put_unaligned_be32(42, &p[0]);
 991
 992         transport_kunmap_data_sg(se_cmd);
 993         target_complete_cmd(se_cmd, GOOD);
 994
 995         return TCM_NO_SENSE;
 996 }
 997
 998 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
 999 {
1000         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1001         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1002         sense_reason_t rc = TCM_NO_SENSE;
1003
1004         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1005                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1006
1007         if (list_id != 0) {
1008                 pr_err("Receive Copy Results with non zero list identifier"
1009                        " not supported\n");
1010                 return TCM_INVALID_CDB_FIELD;
1011         }
1012
1013         switch (sa) {
1014         case RCR_SA_OPERATING_PARAMETERS:
1015                 rc = target_rcr_operating_parameters(se_cmd);
1016                 break;
1017         case RCR_SA_COPY_STATUS:
1018         case RCR_SA_RECEIVE_DATA:
1019         case RCR_SA_FAILED_SEGMENT_DETAILS:
1020         default:
1021                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1022                 return TCM_INVALID_CDB_FIELD;
1023         }
1024
1025         return rc;
1026 }