drivers/target/target_core_xcopy.c

   1 /*******************************************************************************
   2  * Filename: target_core_xcopy.c
   3  *
   4  * This file contains support for SPC-4 Extended-Copy offload with generic
   5  * TCM backends.
   6  *
   7  * Copyright (c) 2011-2013 Datera, Inc. All rights reserved.
   8  *
   9  * Author:
  10  * Nicholas A. Bellinger <nab@daterainc.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  ******************************************************************************/
  23
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/list.h>
  27 #include <linux/configfs.h>
  28 #include <scsi/scsi_proto.h>
  29 #include <asm/unaligned.h>
  30
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_backend.h>
  33 #include <target/target_core_fabric.h>
  34
  35 #include "target_core_internal.h"
  36 #include "target_core_pr.h"
  37 #include "target_core_ua.h"
  38 #include "target_core_xcopy.h"
  39
  40 static struct workqueue_struct *xcopy_wq = NULL;
  41
  42 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  43 {
  44         int off = 0;
  45
  46         buf[off++] = (0x6 << 4);
  47         buf[off++] = 0x01;
  48         buf[off++] = 0x40;
  49         buf[off] = (0x5 << 4);
  50
  51         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  52         return 0;
  53 }
  54
  55 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
  56                                         bool src)
  57 {
  58         struct se_device *se_dev;
  59         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
  60         int rc;
  61
  62         if (src)
  63                 dev_wwn = &xop->dst_tid_wwn[0];
  64         else
  65                 dev_wwn = &xop->src_tid_wwn[0];
  66
  67         mutex_lock(&g_device_mutex);
  68         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  69
  70                 if (!se_dev->dev_attrib.emulate_3pc)
  71                         continue;
  72
  73                 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  74                 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  75
  76                 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  77                 if (rc != 0)
  78                         continue;
  79
  80                 if (src) {
  81                         xop->dst_dev = se_dev;
  82                         pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
  83                                 " se_dev\n", xop->dst_dev);
  84                 } else {
  85                         xop->src_dev = se_dev;
  86                         pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
  87                                 " se_dev\n", xop->src_dev);
  88                 }
  89
  90                 rc = target_depend_item(&se_dev->dev_group.cg_item);
  91                 if (rc != 0) {
  92                         pr_err("configfs_depend_item attempt failed:"
  93                                 " %d for se_dev: %p\n", rc, se_dev);
  94                         mutex_unlock(&g_device_mutex);
  95                         return rc;
  96                 }
  97
  98                 pr_debug("Called configfs_depend_item for se_dev: %p"
  99                         " se_dev->se_dev_group: %p\n", se_dev,
 100                         &se_dev->dev_group);
 101
 102                 mutex_unlock(&g_device_mutex);
 103                 return 0;
 104         }
 105         mutex_unlock(&g_device_mutex);
 106
 107         pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 108         return -EINVAL;
 109 }
 110
 111 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 112                                 unsigned char *p, bool src)
 113 {
 114         unsigned char *desc = p;
 115         unsigned short ript;
 116         u8 desig_len;
 117         /*
 118          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 119          */
 120         ript = get_unaligned_be16(&desc[2]);
 121         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 122         /*
 123          * Check for supported code set, association, and designator type
 124          */
 125         if ((desc[4] & 0x0f) != 0x1) {
 126                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 127                 return -EINVAL;
 128         }
 129         if ((desc[5] & 0x30) != 0x00) {
 130                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 131                 return -EINVAL;
 132         }
 133         if ((desc[5] & 0x0f) != 0x3) {
 134                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 135                                 (desc[5] & 0x0f));
 136                 return -EINVAL;
 137         }
 138         /*
 139          * Check for matching 16 byte length for NAA IEEE Registered Extended
 140          * Assigned designator
 141          */
 142         desig_len = desc[7];
 143         if (desig_len != 16) {
 144                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 145                 return -EINVAL;
 146         }
 147         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 148         /*
 149          * Check for NAA IEEE Registered Extended Assigned header..
 150          */
 151         if ((desc[8] & 0xf0) != 0x60) {
 152                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 153                                         (desc[8] & 0xf0));
 154                 return -EINVAL;
 155         }
 156
 157         if (src) {
 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         } else {
 170                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 171                 /*
 172                  * Determine if the destination designator matches the local device
 173                  */
 174                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 175                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 176                         xop->op_origin = XCOL_DEST_RECV_OP;
 177                         xop->dst_dev = se_cmd->se_dev;
 178                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 179                                 " received xop\n", xop->dst_dev);
 180                 }
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 187                                 struct xcopy_op *xop, unsigned char *p,
 188                                 unsigned short tdll)
 189 {
 190         struct se_device *local_dev = se_cmd->se_dev;
 191         unsigned char *desc = p;
 192         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
 193         unsigned short start = 0;
 194         bool src = true;
 195
 196         if (offset != 0) {
 197                 pr_err("XCOPY target descriptor list length is not"
 198                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 199                 return -EINVAL;
 200         }
 201         if (tdll > 64) {
 202                 pr_err("XCOPY target descriptor supports a maximum"
 203                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 204                 return -EINVAL;
 205         }
 206         /*
 207          * Generate an IEEE Registered Extended designator based upon the
 208          * se_device the XCOPY was received upon..
 209          */
 210         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 211         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 212
 213         while (start < tdll) {
 214                 /*
 215                  * Check target descriptor identification with 0xE4 type with
 216                  * use VPD 0x83 WWPN matching ..
 217                  */
 218                 switch (desc[0]) {
 219                 case 0xe4:
 220                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 221                                                         &desc[0], src);
 222                         if (rc != 0)
 223                                 goto out;
 224                         /*
 225                          * Assume target descriptors are in source -> destination order..
 226                          */
 227                         if (src)
 228                                 src = false;
 229                         else
 230                                 src = true;
 231                         start += XCOPY_TARGET_DESC_LEN;
 232                         desc += XCOPY_TARGET_DESC_LEN;
 233                         ret++;
 234                         break;
 235                 default:
 236                         pr_err("XCOPY unsupported descriptor type code:"
 237                                         " 0x%02x\n", desc[0]);
 238                         goto out;
 239                 }
 240         }
 241
 242         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 243                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
 244         else
 245                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
 246
 247         if (rc < 0)
 248                 goto out;
 249
 250         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 251                  xop->src_dev, &xop->src_tid_wwn[0]);
 252         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 253                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 254
 255         return ret;
 256
 257 out:
 258         return -EINVAL;
 259 }
 260
 261 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 262                                         unsigned char *p)
 263 {
 264         unsigned char *desc = p;
 265         int dc = (desc[1] & 0x02);
 266         unsigned short desc_len;
 267
 268         desc_len = get_unaligned_be16(&desc[2]);
 269         if (desc_len != 0x18) {
 270                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 271                                 " %hu\n", desc_len);
 272                 return -EINVAL;
 273         }
 274
 275         xop->stdi = get_unaligned_be16(&desc[4]);
 276         xop->dtdi = get_unaligned_be16(&desc[6]);
 277         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 278                 desc_len, xop->stdi, xop->dtdi, dc);
 279
 280         xop->nolb = get_unaligned_be16(&desc[10]);
 281         xop->src_lba = get_unaligned_be64(&desc[12]);
 282         xop->dst_lba = get_unaligned_be64(&desc[20]);
 283         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 284                 xop->nolb, (unsigned long long)xop->src_lba,
 285                 (unsigned long long)xop->dst_lba);
 286
 287         if (dc != 0) {
 288                 xop->dbl = (desc[29] & 0xff) << 16;
 289                 xop->dbl |= (desc[30] & 0xff) << 8;
 290                 xop->dbl |= desc[31] & 0xff;
 291
 292                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 293         }
 294         return 0;
 295 }
 296
 297 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 298                                 struct xcopy_op *xop, unsigned char *p,
 299                                 unsigned int sdll)
 300 {
 301         unsigned char *desc = p;
 302         unsigned int start = 0;
 303         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 304
 305         if (offset != 0) {
 306                 pr_err("XCOPY segment descriptor list length is not"
 307                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 308                 return -EINVAL;
 309         }
 310
 311         while (start < sdll) {
 312                 /*
 313                  * Check segment descriptor type code for block -> block
 314                  */
 315                 switch (desc[0]) {
 316                 case 0x02:
 317                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 318                         if (rc < 0)
 319                                 goto out;
 320
 321                         ret++;
 322                         start += XCOPY_SEGMENT_DESC_LEN;
 323                         desc += XCOPY_SEGMENT_DESC_LEN;
 324                         break;
 325                 default:
 326                         pr_err("XCOPY unsupported segment descriptor"
 327                                 "type: 0x%02x\n", desc[0]);
 328                         goto out;
 329                 }
 330         }
 331
 332         return ret;
 333
 334 out:
 335         return -EINVAL;
 336 }
 337
 338 /*
 339  * Start xcopy_pt ops
 340  */
 341
 342 struct xcopy_pt_cmd {
 343         bool remote_port;
 344         struct se_cmd se_cmd;
 345         struct xcopy_op *xcopy_op;
 346         struct completion xpt_passthrough_sem;
 347         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 348 };
 349
 350 struct se_portal_group xcopy_pt_tpg;
 351 static struct se_session xcopy_pt_sess;
 352 static struct se_node_acl xcopy_pt_nacl;
 353
 354 static char *xcopy_pt_get_fabric_name(void)
 355 {
 356         return "xcopy-pt";
 357 }
 358
 359 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 360 {
 361         return 0;
 362 }
 363
 364 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 365 {
 366         struct se_device *remote_dev;
 367
 368         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 369                 remote_dev = xop->dst_dev;
 370         else
 371                 remote_dev = xop->src_dev;
 372
 373         pr_debug("Calling configfs_undepend_item for"
 374                   " remote_dev: %p remote_dev->dev_group: %p\n",
 375                   remote_dev, &remote_dev->dev_group.cg_item);
 376
 377         target_undepend_item(&remote_dev->dev_group.cg_item);
 378 }
 379
 380 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 381 {
 382         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 383                                 struct xcopy_pt_cmd, se_cmd);
 384
 385         kfree(xpt_cmd);
 386 }
 387
 388 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 389 {
 390         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 391                                 struct xcopy_pt_cmd, se_cmd);
 392
 393         complete(&xpt_cmd->xpt_passthrough_sem);
 394         return 0;
 395 }
 396
 397 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 398 {
 399         return 0;
 400 }
 401
 402 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 403 {
 404         return 0;
 405 }
 406
 407 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 408 {
 409         return 0;
 410 }
 411
 412 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 413 {
 414         return 0;
 415 }
 416
 417 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 418         .get_fabric_name        = xcopy_pt_get_fabric_name,
 419         .get_cmd_state          = xcopy_pt_get_cmd_state,
 420         .release_cmd            = xcopy_pt_release_cmd,
 421         .check_stop_free        = xcopy_pt_check_stop_free,
 422         .write_pending          = xcopy_pt_write_pending,
 423         .write_pending_status   = xcopy_pt_write_pending_status,
 424         .queue_data_in          = xcopy_pt_queue_data_in,
 425         .queue_status           = xcopy_pt_queue_status,
 426 };
 427
 428 /*
 429  * End xcopy_pt_ops
 430  */
 431
 432 int target_xcopy_setup_pt(void)
 433 {
 434         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 435         if (!xcopy_wq) {
 436                 pr_err("Unable to allocate xcopy_wq\n");
 437                 return -ENOMEM;
 438         }
 439
 440         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 441         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 442         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 443         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 444
 445         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 446
 447         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 448         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 449         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 450         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 451         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 452         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 453
 454         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 455         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 456
 457         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 458         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 459
 460         return 0;
 461 }
 462
 463 void target_xcopy_release_pt(void)
 464 {
 465         if (xcopy_wq)
 466                 destroy_workqueue(xcopy_wq);
 467 }
 468
 469 static void target_xcopy_setup_pt_port(
 470         struct xcopy_pt_cmd *xpt_cmd,
 471         struct xcopy_op *xop,
 472         bool remote_port)
 473 {
 474         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 475         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 476
 477         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 478                 /*
 479                  * Honor destination port reservations for X-COPY PUSH emulation
 480                  * when CDB is received on local source port, and READs blocks to
 481                  * WRITE on remote destination port.
 482                  */
 483                 if (remote_port) {
 484                         xpt_cmd->remote_port = remote_port;
 485                 } else {
 486                         pt_cmd->se_lun = ec_cmd->se_lun;
 487                         pt_cmd->se_dev = ec_cmd->se_dev;
 488
 489                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 490                                 " %p\n", pt_cmd->se_dev);
 491                         pt_cmd->se_lun = ec_cmd->se_lun;
 492                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 493                                 pt_cmd->se_lun);
 494                 }
 495         } else {
 496                 /*
 497                  * Honor source port reservation for X-COPY PULL emulation
 498                  * when CDB is received on local desintation port, and READs
 499                  * blocks from the remote source port to WRITE on local
 500                  * destination port.
 501                  */
 502                 if (remote_port) {
 503                         xpt_cmd->remote_port = remote_port;
 504                 } else {
 505                         pt_cmd->se_lun = ec_cmd->se_lun;
 506                         pt_cmd->se_dev = ec_cmd->se_dev;
 507
 508                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 509                                 " %p\n", pt_cmd->se_dev);
 510                         pt_cmd->se_lun = ec_cmd->se_lun;
 511                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 512                                 pt_cmd->se_lun);
 513                 }
 514         }
 515 }
 516
 517 static void target_xcopy_init_pt_lun(struct se_device *se_dev,
 518                 struct se_cmd *pt_cmd, bool remote_port)
 519 {
 520         /*
 521          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 522          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 523          * target_xcopy_setup_pt_port()
 524          */
 525         if (remote_port) {
 526                 pr_debug("Setup emulated se_dev: %p from se_dev\n",
 527                         pt_cmd->se_dev);
 528                 pt_cmd->se_lun = &se_dev->xcopy_lun;
 529                 pt_cmd->se_dev = se_dev;
 530         }
 531
 532         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD;
 533 }
 534
 535 static int target_xcopy_setup_pt_cmd(
 536         struct xcopy_pt_cmd *xpt_cmd,
 537         struct xcopy_op *xop,
 538         struct se_device *se_dev,
 539         unsigned char *cdb,
 540         bool remote_port,
 541         bool alloc_mem)
 542 {
 543         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 544         sense_reason_t sense_rc;
 545         int ret = 0, rc;
 546         /*
 547          * Setup LUN+port to honor reservations based upon xop->op_origin for
 548          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 549          */
 550         target_xcopy_init_pt_lun(se_dev, cmd, remote_port);
 551
 552         xpt_cmd->xcopy_op = xop;
 553         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 554
 555         cmd->tag = 0;
 556         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 557         if (sense_rc) {
 558                 ret = -EINVAL;
 559                 goto out;
 560         }
 561
 562         if (alloc_mem) {
 563                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 564                                       cmd->data_length, false);
 565                 if (rc < 0) {
 566                         ret = rc;
 567                         goto out;
 568                 }
 569                 /*
 570                  * Set this bit so that transport_free_pages() allows the
 571                  * caller to release SGLs + physical memory allocated by
 572                  * transport_generic_get_mem()..
 573                  */
 574                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 575         } else {
 576                 /*
 577                  * Here the previously allocated SGLs for the internal READ
 578                  * are mapped zero-copy to the internal WRITE.
 579                  */
 580                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 581                                         xop->xop_data_sg, xop->xop_data_nents,
 582                                         NULL, 0);
 583                 if (sense_rc) {
 584                         ret = -EINVAL;
 585                         goto out;
 586                 }
 587
 588                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 589                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 590         }
 591
 592         return 0;
 593
 594 out:
 595         return ret;
 596 }
 597
 598 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 599 {
 600         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 601         sense_reason_t sense_rc;
 602
 603         sense_rc = transport_generic_new_cmd(se_cmd);
 604         if (sense_rc)
 605                 return -EINVAL;
 606
 607         if (se_cmd->data_direction == DMA_TO_DEVICE)
 608                 target_execute_cmd(se_cmd);
 609
 610         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 611
 612         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 613                         se_cmd->scsi_status);
 614
 615         return (se_cmd->scsi_status) ? -EINVAL : 0;
 616 }
 617
 618 static int target_xcopy_read_source(
 619         struct se_cmd *ec_cmd,
 620         struct xcopy_op *xop,
 621         struct se_device *src_dev,
 622         sector_t src_lba,
 623         u32 src_sectors)
 624 {
 625         struct xcopy_pt_cmd *xpt_cmd;
 626         struct se_cmd *se_cmd;
 627         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 628         int rc;
 629         unsigned char cdb[16];
 630         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 631
 632         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 633         if (!xpt_cmd) {
 634                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 635                 return -ENOMEM;
 636         }
 637         init_completion(&xpt_cmd->xpt_passthrough_sem);
 638         se_cmd = &xpt_cmd->se_cmd;
 639
 640         memset(&cdb[0], 0, 16);
 641         cdb[0] = READ_16;
 642         put_unaligned_be64(src_lba, &cdb[2]);
 643         put_unaligned_be32(src_sectors, &cdb[10]);
 644         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 645                 (unsigned long long)src_lba, src_sectors, length);
 646
 647         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 648                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 649         xop->src_pt_cmd = xpt_cmd;
 650
 651         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 652                                 remote_port, true);
 653         if (rc < 0) {
 654                 transport_generic_free_cmd(se_cmd, 0);
 655                 return rc;
 656         }
 657
 658         xop->xop_data_sg = se_cmd->t_data_sg;
 659         xop->xop_data_nents = se_cmd->t_data_nents;
 660         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 661                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 662
 663         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 664         if (rc < 0) {
 665                 transport_generic_free_cmd(se_cmd, 0);
 666                 return rc;
 667         }
 668         /*
 669          * Clear off the allocated t_data_sg, that has been saved for
 670          * zero-copy WRITE submission reuse in struct xcopy_op..
 671          */
 672         se_cmd->t_data_sg = NULL;
 673         se_cmd->t_data_nents = 0;
 674
 675         return 0;
 676 }
 677
 678 static int target_xcopy_write_destination(
 679         struct se_cmd *ec_cmd,
 680         struct xcopy_op *xop,
 681         struct se_device *dst_dev,
 682         sector_t dst_lba,
 683         u32 dst_sectors)
 684 {
 685         struct xcopy_pt_cmd *xpt_cmd;
 686         struct se_cmd *se_cmd;
 687         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 688         int rc;
 689         unsigned char cdb[16];
 690         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 691
 692         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 693         if (!xpt_cmd) {
 694                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 695                 return -ENOMEM;
 696         }
 697         init_completion(&xpt_cmd->xpt_passthrough_sem);
 698         se_cmd = &xpt_cmd->se_cmd;
 699
 700         memset(&cdb[0], 0, 16);
 701         cdb[0] = WRITE_16;
 702         put_unaligned_be64(dst_lba, &cdb[2]);
 703         put_unaligned_be32(dst_sectors, &cdb[10]);
 704         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 705                 (unsigned long long)dst_lba, dst_sectors, length);
 706
 707         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 708                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 709         xop->dst_pt_cmd = xpt_cmd;
 710
 711         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 712                                 remote_port, false);
 713         if (rc < 0) {
 714                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 715                 /*
 716                  * If the failure happened before the t_mem_list hand-off in
 717                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 718                  * core releases this memory on error during X-COPY WRITE I/O.
 719                  */
 720                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 721                 src_cmd->t_data_sg = xop->xop_data_sg;
 722                 src_cmd->t_data_nents = xop->xop_data_nents;
 723
 724                 transport_generic_free_cmd(se_cmd, 0);
 725                 return rc;
 726         }
 727
 728         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 729         if (rc < 0) {
 730                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 731                 transport_generic_free_cmd(se_cmd, 0);
 732                 return rc;
 733         }
 734
 735         return 0;
 736 }
 737
 738 static void target_xcopy_do_work(struct work_struct *work)
 739 {
 740         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 741         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 742         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 743         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 744         unsigned int max_sectors;
 745         int rc;
 746         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 747
 748         end_lba = src_lba + nolb;
 749         /*
 750          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 751          * smallest max_sectors between src_dev + dev_dev, or
 752          */
 753         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 754                           dst_dev->dev_attrib.hw_max_sectors);
 755         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 756
 757         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 758
 759         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 760                         nolb, max_nolb, (unsigned long long)end_lba);
 761         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 762                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 763
 764         while (src_lba < end_lba) {
 765                 cur_nolb = min(nolb, max_nolb);
 766
 767                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 768                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 769
 770                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 771                 if (rc < 0)
 772                         goto out;
 773
 774                 src_lba += cur_nolb;
 775                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 776                                 (unsigned long long)src_lba);
 777
 778                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 779                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 780
 781                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 782                                                 dst_lba, cur_nolb);
 783                 if (rc < 0) {
 784                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 785                         goto out;
 786                 }
 787
 788                 dst_lba += cur_nolb;
 789                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 790                                 (unsigned long long)dst_lba);
 791
 792                 copied_nolb += cur_nolb;
 793                 nolb -= cur_nolb;
 794
 795                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 796                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 797
 798                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 799         }
 800
 801         xcopy_pt_undepend_remotedev(xop);
 802         kfree(xop);
 803
 804         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 805                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 806         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 807                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 808
 809         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 810         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 811         return;
 812
 813 out:
 814         xcopy_pt_undepend_remotedev(xop);
 815         kfree(xop);
 816
 817         pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
 818         ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 819         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 820 }
 821
 822 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 823 {
 824         struct se_device *dev = se_cmd->se_dev;
 825         struct xcopy_op *xop = NULL;
 826         unsigned char *p = NULL, *seg_desc;
 827         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 828         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 829         int rc;
 830         unsigned short tdll;
 831
 832         if (!dev->dev_attrib.emulate_3pc) {
 833                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 834                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 835         }
 836
 837         sa = se_cmd->t_task_cdb[1] & 0x1f;
 838         if (sa != 0x00) {
 839                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 840                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 841         }
 842
 843         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 844         if (!xop) {
 845                 pr_err("Unable to allocate xcopy_op\n");
 846                 return TCM_OUT_OF_RESOURCES;
 847         }
 848         xop->xop_se_cmd = se_cmd;
 849
 850         p = transport_kmap_data_sg(se_cmd);
 851         if (!p) {
 852                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 853                 kfree(xop);
 854                 return TCM_OUT_OF_RESOURCES;
 855         }
 856
 857         list_id = p[0];
 858         list_id_usage = (p[1] & 0x18) >> 3;
 859
 860         /*
 861          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 862          */
 863         tdll = get_unaligned_be16(&p[2]);
 864         sdll = get_unaligned_be32(&p[8]);
 865
 866         inline_dl = get_unaligned_be32(&p[12]);
 867         if (inline_dl != 0) {
 868                 pr_err("XCOPY with non zero inline data length\n");
 869                 goto out;
 870         }
 871
 872         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 873                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 874                 tdll, sdll, inline_dl);
 875
 876         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
 877         if (rc <= 0)
 878                 goto out;
 879
 880         if (xop->src_dev->dev_attrib.block_size !=
 881             xop->dst_dev->dev_attrib.block_size) {
 882                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 883                        " block_size: %u currently unsupported\n",
 884                         xop->src_dev->dev_attrib.block_size,
 885                         xop->dst_dev->dev_attrib.block_size);
 886                 xcopy_pt_undepend_remotedev(xop);
 887                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 888                 goto out;
 889         }
 890
 891         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 892                                 rc * XCOPY_TARGET_DESC_LEN);
 893         seg_desc = &p[16];
 894         seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
 895
 896         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
 897         if (rc <= 0) {
 898                 xcopy_pt_undepend_remotedev(xop);
 899                 goto out;
 900         }
 901         transport_kunmap_data_sg(se_cmd);
 902
 903         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 904                                 rc * XCOPY_SEGMENT_DESC_LEN);
 905         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 906         queue_work(xcopy_wq, &xop->xop_work);
 907         return TCM_NO_SENSE;
 908
 909 out:
 910         if (p)
 911                 transport_kunmap_data_sg(se_cmd);
 912         kfree(xop);
 913         return ret;
 914 }
 915
 916 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 917 {
 918         unsigned char *p;
 919
 920         p = transport_kmap_data_sg(se_cmd);
 921         if (!p) {
 922                 pr_err("transport_kmap_data_sg failed in"
 923                        " target_rcr_operating_parameters\n");
 924                 return TCM_OUT_OF_RESOURCES;
 925         }
 926
 927         if (se_cmd->data_length < 54) {
 928                 pr_err("Receive Copy Results Op Parameters length"
 929                        " too small: %u\n", se_cmd->data_length);
 930                 transport_kunmap_data_sg(se_cmd);
 931                 return TCM_INVALID_CDB_FIELD;
 932         }
 933         /*
 934          * Set SNLID=1 (Supports no List ID)
 935          */
 936         p[4] = 0x1;
 937         /*
 938          * MAXIMUM TARGET DESCRIPTOR COUNT
 939          */
 940         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 941         /*
 942          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 943          */
 944         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 945         /*
 946          * MAXIMUM DESCRIPTOR LIST LENGTH
 947          */
 948         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 949         /*
 950          * MAXIMUM SEGMENT LENGTH
 951          */
 952         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
 953         /*
 954          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
 955          */
 956         put_unaligned_be32(0x0, &p[20]);
 957         /*
 958          * HELD DATA LIMIT
 959          */
 960         put_unaligned_be32(0x0, &p[24]);
 961         /*
 962          * MAXIMUM STREAM DEVICE TRANSFER SIZE
 963          */
 964         put_unaligned_be32(0x0, &p[28]);
 965         /*
 966          * TOTAL CONCURRENT COPIES
 967          */
 968         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
 969         /*
 970          * MAXIMUM CONCURRENT COPIES
 971          */
 972         p[36] = RCR_OP_MAX_CONCURR_COPIES;
 973         /*
 974          * DATA SEGMENT GRANULARITY (log 2)
 975          */
 976         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
 977         /*
 978          * INLINE DATA GRANULARITY log 2)
 979          */
 980         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
 981         /*
 982          * HELD DATA GRANULARITY
 983          */
 984         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
 985         /*
 986          * IMPLEMENTED DESCRIPTOR LIST LENGTH
 987          */
 988         p[43] = 0x2;
 989         /*
 990          * List of implemented descriptor type codes (ordered)
 991          */
 992         p[44] = 0x02; /* Copy Block to Block device */
 993         p[45] = 0xe4; /* Identification descriptor target descriptor */
 994
 995         /*
 996          * AVAILABLE DATA (n-3)
 997          */
 998         put_unaligned_be32(42, &p[0]);
 999
1000         transport_kunmap_data_sg(se_cmd);
1001         target_complete_cmd(se_cmd, GOOD);
1002
1003         return TCM_NO_SENSE;
1004 }
1005
1006 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1007 {
1008         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1009         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1010         sense_reason_t rc = TCM_NO_SENSE;
1011
1012         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1013                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1014
1015         if (list_id != 0) {
1016                 pr_err("Receive Copy Results with non zero list identifier"
1017                        " not supported\n");
1018                 return TCM_INVALID_CDB_FIELD;
1019         }
1020
1021         switch (sa) {
1022         case RCR_SA_OPERATING_PARAMETERS:
1023                 rc = target_rcr_operating_parameters(se_cmd);
1024                 break;
1025         case RCR_SA_COPY_STATUS:
1026         case RCR_SA_RECEIVE_DATA:
1027         case RCR_SA_FAILED_SEGMENT_DETAILS:
1028         default:
1029                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1030                 return TCM_INVALID_CDB_FIELD;
1031         }
1032
1033         return rc;
1034 }