Pileus Git - ~andy/linux/blob - 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.h>
  29 #include <scsi/scsi_cmnd.h>
  30 #include <asm/unaligned.h>
  31
  32 #include <target/target_core_base.h>
  33 #include <target/target_core_backend.h>
  34 #include <target/target_core_fabric.h>
  35 #include <target/target_core_configfs.h>
  36
  37 #include "target_core_pr.h"
  38 #include "target_core_ua.h"
  39 #include "target_core_xcopy.h"
  40
  41 static struct workqueue_struct *xcopy_wq = NULL;
  42 /*
  43  * From target_core_device.c
  44  */
  45 extern struct mutex g_device_mutex;
  46 extern struct list_head g_device_list;
  47 /*
  48  * From target_core_configfs.c
  49  */
  50 extern struct configfs_subsystem *target_core_subsystem[];
  51
  52 static int target_xcopy_gen_naa_ieee(struct se_device *dev, unsigned char *buf)
  53 {
  54         int off = 0;
  55
  56         buf[off++] = (0x6 << 4);
  57         buf[off++] = 0x01;
  58         buf[off++] = 0x40;
  59         buf[off] = (0x5 << 4);
  60
  61         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
  62         return 0;
  63 }
  64
  65 static int target_xcopy_locate_se_dev_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
  66                                         bool src)
  67 {
  68         struct se_device *se_dev;
  69         struct configfs_subsystem *subsys = target_core_subsystem[0];
  70         unsigned char tmp_dev_wwn[XCOPY_NAA_IEEE_REGEX_LEN], *dev_wwn;
  71         int rc;
  72
  73         if (src == true)
  74                 dev_wwn = &xop->dst_tid_wwn[0];
  75         else
  76                 dev_wwn = &xop->src_tid_wwn[0];
  77
  78         mutex_lock(&g_device_mutex);
  79         list_for_each_entry(se_dev, &g_device_list, g_dev_node) {
  80
  81                 if (!se_dev->dev_attrib.emulate_3pc)
  82                         continue;
  83
  84                 memset(&tmp_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
  85                 target_xcopy_gen_naa_ieee(se_dev, &tmp_dev_wwn[0]);
  86
  87                 rc = memcmp(&tmp_dev_wwn[0], dev_wwn, XCOPY_NAA_IEEE_REGEX_LEN);
  88                 if (rc != 0)
  89                         continue;
  90
  91                 if (src == true) {
  92                         xop->dst_dev = se_dev;
  93                         pr_debug("XCOPY 0xe4: Setting xop->dst_dev: %p from located"
  94                                 " se_dev\n", xop->dst_dev);
  95                 } else {
  96                         xop->src_dev = se_dev;
  97                         pr_debug("XCOPY 0xe4: Setting xop->src_dev: %p from located"
  98                                 " se_dev\n", xop->src_dev);
  99                 }
 100
 101                 rc = configfs_depend_item(subsys,
 102                                 &se_dev->dev_group.cg_item);
 103                 if (rc != 0) {
 104                         pr_err("configfs_depend_item attempt failed:"
 105                                 " %d for se_dev: %p\n", rc, se_dev);
 106                         mutex_unlock(&g_device_mutex);
 107                         return rc;
 108                 }
 109
 110                 pr_debug("Called configfs_depend_item for subsys: %p se_dev: %p"
 111                         " se_dev->se_dev_group: %p\n", subsys, se_dev,
 112                         &se_dev->dev_group);
 113
 114                 mutex_unlock(&g_device_mutex);
 115                 return 0;
 116         }
 117         mutex_unlock(&g_device_mutex);
 118
 119         pr_err("Unable to locate 0xe4 descriptor for EXTENDED_COPY\n");
 120         return -EINVAL;
 121 }
 122
 123 static int target_xcopy_parse_tiddesc_e4(struct se_cmd *se_cmd, struct xcopy_op *xop,
 124                                 unsigned char *p, bool src)
 125 {
 126         unsigned char *desc = p;
 127         unsigned short ript;
 128         u8 desig_len;
 129         /*
 130          * Extract RELATIVE INITIATOR PORT IDENTIFIER
 131          */
 132         ript = get_unaligned_be16(&desc[2]);
 133         pr_debug("XCOPY 0xe4: RELATIVE INITIATOR PORT IDENTIFIER: %hu\n", ript);
 134         /*
 135          * Check for supported code set, association, and designator type
 136          */
 137         if ((desc[4] & 0x0f) != 0x1) {
 138                 pr_err("XCOPY 0xe4: code set of non binary type not supported\n");
 139                 return -EINVAL;
 140         }
 141         if ((desc[5] & 0x30) != 0x00) {
 142                 pr_err("XCOPY 0xe4: association other than LUN not supported\n");
 143                 return -EINVAL;
 144         }
 145         if ((desc[5] & 0x0f) != 0x3) {
 146                 pr_err("XCOPY 0xe4: designator type unsupported: 0x%02x\n",
 147                                 (desc[5] & 0x0f));
 148                 return -EINVAL;
 149         }
 150         /*
 151          * Check for matching 16 byte length for NAA IEEE Registered Extended
 152          * Assigned designator
 153          */
 154         desig_len = desc[7];
 155         if (desig_len != 16) {
 156                 pr_err("XCOPY 0xe4: invalid desig_len: %d\n", (int)desig_len);
 157                 return -EINVAL;
 158         }
 159         pr_debug("XCOPY 0xe4: desig_len: %d\n", (int)desig_len);
 160         /*
 161          * Check for NAA IEEE Registered Extended Assigned header..
 162          */
 163         if ((desc[8] & 0xf0) != 0x60) {
 164                 pr_err("XCOPY 0xe4: Unsupported DESIGNATOR TYPE: 0x%02x\n",
 165                                         (desc[8] & 0xf0));
 166                 return -EINVAL;
 167         }
 168
 169         if (src == true) {
 170                 memcpy(&xop->src_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 171                 /*
 172                  * Determine if the source designator matches the local device
 173                  */
 174                 if (!memcmp(&xop->local_dev_wwn[0], &xop->src_tid_wwn[0],
 175                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 176                         xop->op_origin = XCOL_SOURCE_RECV_OP;
 177                         xop->src_dev = se_cmd->se_dev;
 178                         pr_debug("XCOPY 0xe4: Set xop->src_dev %p from source"
 179                                         " received xop\n", xop->src_dev);
 180                 }
 181         } else {
 182                 memcpy(&xop->dst_tid_wwn[0], &desc[8], XCOPY_NAA_IEEE_REGEX_LEN);
 183                 /*
 184                  * Determine if the destination designator matches the local device
 185                  */
 186                 if (!memcmp(&xop->local_dev_wwn[0], &xop->dst_tid_wwn[0],
 187                                 XCOPY_NAA_IEEE_REGEX_LEN)) {
 188                         xop->op_origin = XCOL_DEST_RECV_OP;
 189                         xop->dst_dev = se_cmd->se_dev;
 190                         pr_debug("XCOPY 0xe4: Set xop->dst_dev: %p from destination"
 191                                 " received xop\n", xop->dst_dev);
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int target_xcopy_parse_target_descriptors(struct se_cmd *se_cmd,
 199                                 struct xcopy_op *xop, unsigned char *p,
 200                                 unsigned short tdll)
 201 {
 202         struct se_device *local_dev = se_cmd->se_dev;
 203         unsigned char *desc = p;
 204         int offset = tdll % XCOPY_TARGET_DESC_LEN, rc, ret = 0;
 205         unsigned short start = 0;
 206         bool src = true;
 207
 208         if (offset != 0) {
 209                 pr_err("XCOPY target descriptor list length is not"
 210                         " multiple of %d\n", XCOPY_TARGET_DESC_LEN);
 211                 return -EINVAL;
 212         }
 213         if (tdll > 64) {
 214                 pr_err("XCOPY target descriptor supports a maximum"
 215                         " two src/dest descriptors, tdll: %hu too large..\n", tdll);
 216                 return -EINVAL;
 217         }
 218         /*
 219          * Generate an IEEE Registered Extended designator based upon the
 220          * se_device the XCOPY was received upon..
 221          */
 222         memset(&xop->local_dev_wwn[0], 0, XCOPY_NAA_IEEE_REGEX_LEN);
 223         target_xcopy_gen_naa_ieee(local_dev, &xop->local_dev_wwn[0]);
 224
 225         while (start < tdll) {
 226                 /*
 227                  * Check target descriptor identification with 0xE4 type with
 228                  * use VPD 0x83 WWPN matching ..
 229                  */
 230                 switch (desc[0]) {
 231                 case 0xe4:
 232                         rc = target_xcopy_parse_tiddesc_e4(se_cmd, xop,
 233                                                         &desc[0], src);
 234                         if (rc != 0)
 235                                 goto out;
 236                         /*
 237                          * Assume target descriptors are in source -> destination order..
 238                          */
 239                         if (src == true)
 240                                 src = false;
 241                         else
 242                                 src = true;
 243                         start += XCOPY_TARGET_DESC_LEN;
 244                         desc += XCOPY_TARGET_DESC_LEN;
 245                         ret++;
 246                         break;
 247                 default:
 248                         pr_err("XCOPY unsupported descriptor type code:"
 249                                         " 0x%02x\n", desc[0]);
 250                         goto out;
 251                 }
 252         }
 253
 254         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 255                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, true);
 256         else
 257                 rc = target_xcopy_locate_se_dev_e4(se_cmd, xop, false);
 258
 259         if (rc < 0)
 260                 goto out;
 261
 262         pr_debug("XCOPY TGT desc: Source dev: %p NAA IEEE WWN: 0x%16phN\n",
 263                  xop->src_dev, &xop->src_tid_wwn[0]);
 264         pr_debug("XCOPY TGT desc: Dest dev: %p NAA IEEE WWN: 0x%16phN\n",
 265                  xop->dst_dev, &xop->dst_tid_wwn[0]);
 266
 267         return ret;
 268
 269 out:
 270         return -EINVAL;
 271 }
 272
 273 static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op *xop,
 274                                         unsigned char *p)
 275 {
 276         unsigned char *desc = p;
 277         int dc = (desc[1] & 0x02);
 278         unsigned short desc_len;
 279
 280         desc_len = get_unaligned_be16(&desc[2]);
 281         if (desc_len != 0x18) {
 282                 pr_err("XCOPY segment desc 0x02: Illegal desc_len:"
 283                                 " %hu\n", desc_len);
 284                 return -EINVAL;
 285         }
 286
 287         xop->stdi = get_unaligned_be16(&desc[4]);
 288         xop->dtdi = get_unaligned_be16(&desc[6]);
 289         pr_debug("XCOPY seg desc 0x02: desc_len: %hu stdi: %hu dtdi: %hu, DC: %d\n",
 290                 desc_len, xop->stdi, xop->dtdi, dc);
 291
 292         xop->nolb = get_unaligned_be16(&desc[10]);
 293         xop->src_lba = get_unaligned_be64(&desc[12]);
 294         xop->dst_lba = get_unaligned_be64(&desc[20]);
 295         pr_debug("XCOPY seg desc 0x02: nolb: %hu src_lba: %llu dst_lba: %llu\n",
 296                 xop->nolb, (unsigned long long)xop->src_lba,
 297                 (unsigned long long)xop->dst_lba);
 298
 299         if (dc != 0) {
 300                 xop->dbl = (desc[29] & 0xff) << 16;
 301                 xop->dbl |= (desc[30] & 0xff) << 8;
 302                 xop->dbl |= desc[31] & 0xff;
 303
 304                 pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 305         }
 306         return 0;
 307 }
 308
 309 static int target_xcopy_parse_segment_descriptors(struct se_cmd *se_cmd,
 310                                 struct xcopy_op *xop, unsigned char *p,
 311                                 unsigned int sdll)
 312 {
 313         unsigned char *desc = p;
 314         unsigned int start = 0;
 315         int offset = sdll % XCOPY_SEGMENT_DESC_LEN, rc, ret = 0;
 316
 317         if (offset != 0) {
 318                 pr_err("XCOPY segment descriptor list length is not"
 319                         " multiple of %d\n", XCOPY_SEGMENT_DESC_LEN);
 320                 return -EINVAL;
 321         }
 322
 323         while (start < sdll) {
 324                 /*
 325                  * Check segment descriptor type code for block -> block
 326                  */
 327                 switch (desc[0]) {
 328                 case 0x02:
 329                         rc = target_xcopy_parse_segdesc_02(se_cmd, xop, desc);
 330                         if (rc < 0)
 331                                 goto out;
 332
 333                         ret++;
 334                         start += XCOPY_SEGMENT_DESC_LEN;
 335                         desc += XCOPY_SEGMENT_DESC_LEN;
 336                         break;
 337                 default:
 338                         pr_err("XCOPY unspported segment descriptor"
 339                                 "type: 0x%02x\n", desc[0]);
 340                         goto out;
 341                 }
 342         }
 343
 344         return ret;
 345
 346 out:
 347         return -EINVAL;
 348 }
 349
 350 /*
 351  * Start xcopy_pt ops
 352  */
 353
 354 struct xcopy_pt_cmd {
 355         bool remote_port;
 356         struct se_cmd se_cmd;
 357         struct xcopy_op *xcopy_op;
 358         struct completion xpt_passthrough_sem;
 359         unsigned char sense_buffer[TRANSPORT_SENSE_BUFFER];
 360 };
 361
 362 static struct se_port xcopy_pt_port;
 363 static struct se_portal_group xcopy_pt_tpg;
 364 static struct se_session xcopy_pt_sess;
 365 static struct se_node_acl xcopy_pt_nacl;
 366
 367 static char *xcopy_pt_get_fabric_name(void)
 368 {
 369         return "xcopy-pt";
 370 }
 371
 372 static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
 373 {
 374         return 0;
 375 }
 376
 377 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 378 {
 379         return 0;
 380 }
 381
 382 static void xcopy_pt_undepend_remotedev(struct xcopy_op *xop)
 383 {
 384         struct configfs_subsystem *subsys = target_core_subsystem[0];
 385         struct se_device *remote_dev;
 386
 387         if (xop->op_origin == XCOL_SOURCE_RECV_OP)
 388                 remote_dev = xop->dst_dev;
 389         else
 390                 remote_dev = xop->src_dev;
 391
 392         pr_debug("Calling configfs_undepend_item for subsys: %p"
 393                   " remote_dev: %p remote_dev->dev_group: %p\n",
 394                   subsys, remote_dev, &remote_dev->dev_group.cg_item);
 395
 396         configfs_undepend_item(subsys, &remote_dev->dev_group.cg_item);
 397 }
 398
 399 static void xcopy_pt_release_cmd(struct se_cmd *se_cmd)
 400 {
 401         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 402                                 struct xcopy_pt_cmd, se_cmd);
 403
 404         kfree(xpt_cmd);
 405 }
 406
 407 static int xcopy_pt_check_stop_free(struct se_cmd *se_cmd)
 408 {
 409         struct xcopy_pt_cmd *xpt_cmd = container_of(se_cmd,
 410                                 struct xcopy_pt_cmd, se_cmd);
 411
 412         complete(&xpt_cmd->xpt_passthrough_sem);
 413         return 0;
 414 }
 415
 416 static int xcopy_pt_write_pending(struct se_cmd *se_cmd)
 417 {
 418         return 0;
 419 }
 420
 421 static int xcopy_pt_write_pending_status(struct se_cmd *se_cmd)
 422 {
 423         return 0;
 424 }
 425
 426 static int xcopy_pt_queue_data_in(struct se_cmd *se_cmd)
 427 {
 428         return 0;
 429 }
 430
 431 static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 432 {
 433         return 0;
 434 }
 435
 436 static struct target_core_fabric_ops xcopy_pt_tfo = {
 437         .get_fabric_name        = xcopy_pt_get_fabric_name,
 438         .get_task_tag           = xcopy_pt_get_tag,
 439         .get_cmd_state          = xcopy_pt_get_cmd_state,
 440         .release_cmd            = xcopy_pt_release_cmd,
 441         .check_stop_free        = xcopy_pt_check_stop_free,
 442         .write_pending          = xcopy_pt_write_pending,
 443         .write_pending_status   = xcopy_pt_write_pending_status,
 444         .queue_data_in          = xcopy_pt_queue_data_in,
 445         .queue_status           = xcopy_pt_queue_status,
 446 };
 447
 448 /*
 449  * End xcopy_pt_ops
 450  */
 451
 452 int target_xcopy_setup_pt(void)
 453 {
 454         xcopy_wq = alloc_workqueue("xcopy_wq", WQ_MEM_RECLAIM, 0);
 455         if (!xcopy_wq) {
 456                 pr_err("Unable to allocate xcopy_wq\n");
 457                 return -ENOMEM;
 458         }
 459
 460         memset(&xcopy_pt_port, 0, sizeof(struct se_port));
 461         INIT_LIST_HEAD(&xcopy_pt_port.sep_alua_list);
 462         INIT_LIST_HEAD(&xcopy_pt_port.sep_list);
 463         mutex_init(&xcopy_pt_port.sep_tg_pt_md_mutex);
 464
 465         memset(&xcopy_pt_tpg, 0, sizeof(struct se_portal_group));
 466         INIT_LIST_HEAD(&xcopy_pt_tpg.se_tpg_node);
 467         INIT_LIST_HEAD(&xcopy_pt_tpg.acl_node_list);
 468         INIT_LIST_HEAD(&xcopy_pt_tpg.tpg_sess_list);
 469
 470         xcopy_pt_port.sep_tpg = &xcopy_pt_tpg;
 471         xcopy_pt_tpg.se_tpg_tfo = &xcopy_pt_tfo;
 472
 473         memset(&xcopy_pt_nacl, 0, sizeof(struct se_node_acl));
 474         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 475         INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 476         memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
 477         INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
 478         INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
 479
 480         xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 481         xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;
 482
 483         xcopy_pt_sess.se_tpg = &xcopy_pt_tpg;
 484         xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl;
 485
 486         return 0;
 487 }
 488
 489 void target_xcopy_release_pt(void)
 490 {
 491         if (xcopy_wq)
 492                 destroy_workqueue(xcopy_wq);
 493 }
 494
 495 static void target_xcopy_setup_pt_port(
 496         struct xcopy_pt_cmd *xpt_cmd,
 497         struct xcopy_op *xop,
 498         bool remote_port)
 499 {
 500         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 501         struct se_cmd *pt_cmd = &xpt_cmd->se_cmd;
 502
 503         if (xop->op_origin == XCOL_SOURCE_RECV_OP) {
 504                 /*
 505                  * Honor destination port reservations for X-COPY PUSH emulation
 506                  * when CDB is received on local source port, and READs blocks to
 507                  * WRITE on remote destination port.
 508                  */
 509                 if (remote_port) {
 510                         xpt_cmd->remote_port = remote_port;
 511                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 512                         pr_debug("Setup emulated remote DEST xcopy_pt_port: %p to"
 513                                 " cmd->se_lun->lun_sep for X-COPY data PUSH\n",
 514                                 pt_cmd->se_lun->lun_sep);
 515                 } else {
 516                         pt_cmd->se_lun = ec_cmd->se_lun;
 517                         pt_cmd->se_dev = ec_cmd->se_dev;
 518
 519                         pr_debug("Honoring local SRC port from ec_cmd->se_dev:"
 520                                 " %p\n", pt_cmd->se_dev);
 521                         pt_cmd->se_lun = ec_cmd->se_lun;
 522                         pr_debug("Honoring local SRC port from ec_cmd->se_lun: %p\n",
 523                                 pt_cmd->se_lun);
 524                 }
 525         } else {
 526                 /*
 527                  * Honor source port reservation for X-COPY PULL emulation
 528                  * when CDB is received on local desintation port, and READs
 529                  * blocks from the remote source port to WRITE on local
 530                  * destination port.
 531                  */
 532                 if (remote_port) {
 533                         xpt_cmd->remote_port = remote_port;
 534                         pt_cmd->se_lun->lun_sep = &xcopy_pt_port;
 535                         pr_debug("Setup emulated remote SRC xcopy_pt_port: %p to"
 536                                 " cmd->se_lun->lun_sep for X-COPY data PULL\n",
 537                                 pt_cmd->se_lun->lun_sep);
 538                 } else {
 539                         pt_cmd->se_lun = ec_cmd->se_lun;
 540                         pt_cmd->se_dev = ec_cmd->se_dev;
 541
 542                         pr_debug("Honoring local DST port from ec_cmd->se_dev:"
 543                                 " %p\n", pt_cmd->se_dev);
 544                         pt_cmd->se_lun = ec_cmd->se_lun;
 545                         pr_debug("Honoring local DST port from ec_cmd->se_lun: %p\n",
 546                                 pt_cmd->se_lun);
 547                 }
 548         }
 549 }
 550
 551 static int target_xcopy_init_pt_lun(
 552         struct xcopy_pt_cmd *xpt_cmd,
 553         struct xcopy_op *xop,
 554         struct se_device *se_dev,
 555         struct se_cmd *pt_cmd,
 556         bool remote_port)
 557 {
 558         /*
 559          * Don't allocate + init an pt_cmd->se_lun if honoring local port for
 560          * reservations.  The pt_cmd->se_lun pointer will be setup from within
 561          * target_xcopy_setup_pt_port()
 562          */
 563         if (remote_port == false) {
 564                 pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
 565                 return 0;
 566         }
 567
 568         pt_cmd->se_lun = &se_dev->xcopy_lun;
 569         pt_cmd->se_dev = se_dev;
 570
 571         pr_debug("Setup emulated se_dev: %p from se_dev\n", pt_cmd->se_dev);
 572         pt_cmd->se_cmd_flags |= SCF_SE_LUN_CMD | SCF_CMD_XCOPY_PASSTHROUGH;
 573
 574         pr_debug("Setup emulated se_dev: %p to pt_cmd->se_lun->lun_se_dev\n",
 575                 pt_cmd->se_lun->lun_se_dev);
 576
 577         return 0;
 578 }
 579
 580 static int target_xcopy_setup_pt_cmd(
 581         struct xcopy_pt_cmd *xpt_cmd,
 582         struct xcopy_op *xop,
 583         struct se_device *se_dev,
 584         unsigned char *cdb,
 585         bool remote_port,
 586         bool alloc_mem)
 587 {
 588         struct se_cmd *cmd = &xpt_cmd->se_cmd;
 589         sense_reason_t sense_rc;
 590         int ret = 0, rc;
 591         /*
 592          * Setup LUN+port to honor reservations based upon xop->op_origin for
 593          * X-COPY PUSH or X-COPY PULL based upon where the CDB was received.
 594          */
 595         rc = target_xcopy_init_pt_lun(xpt_cmd, xop, se_dev, cmd, remote_port);
 596         if (rc < 0) {
 597                 ret = rc;
 598                 goto out;
 599         }
 600         xpt_cmd->xcopy_op = xop;
 601         target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 602
 603         sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 604         if (sense_rc) {
 605                 ret = -EINVAL;
 606                 goto out;
 607         }
 608
 609         if (alloc_mem) {
 610                 rc = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
 611                                       cmd->data_length, false);
 612                 if (rc < 0) {
 613                         ret = rc;
 614                         goto out;
 615                 }
 616                 /*
 617                  * Set this bit so that transport_free_pages() allows the
 618                  * caller to release SGLs + physical memory allocated by
 619                  * transport_generic_get_mem()..
 620                  */
 621                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 622         } else {
 623                 /*
 624                  * Here the previously allocated SGLs for the internal READ
 625                  * are mapped zero-copy to the internal WRITE.
 626                  */
 627                 sense_rc = transport_generic_map_mem_to_cmd(cmd,
 628                                         xop->xop_data_sg, xop->xop_data_nents,
 629                                         NULL, 0);
 630                 if (sense_rc) {
 631                         ret = -EINVAL;
 632                         goto out;
 633                 }
 634
 635                 pr_debug("Setup PASSTHROUGH_NOALLOC t_data_sg: %p t_data_nents:"
 636                          " %u\n", cmd->t_data_sg, cmd->t_data_nents);
 637         }
 638
 639         return 0;
 640
 641 out:
 642         return ret;
 643 }
 644
 645 static int target_xcopy_issue_pt_cmd(struct xcopy_pt_cmd *xpt_cmd)
 646 {
 647         struct se_cmd *se_cmd = &xpt_cmd->se_cmd;
 648         sense_reason_t sense_rc;
 649
 650         sense_rc = transport_generic_new_cmd(se_cmd);
 651         if (sense_rc)
 652                 return -EINVAL;
 653
 654         if (se_cmd->data_direction == DMA_TO_DEVICE)
 655                 target_execute_cmd(se_cmd);
 656
 657         wait_for_completion_interruptible(&xpt_cmd->xpt_passthrough_sem);
 658
 659         pr_debug("target_xcopy_issue_pt_cmd(): SCSI status: 0x%02x\n",
 660                         se_cmd->scsi_status);
 661
 662         return (se_cmd->scsi_status) ? -EINVAL : 0;
 663 }
 664
 665 static int target_xcopy_read_source(
 666         struct se_cmd *ec_cmd,
 667         struct xcopy_op *xop,
 668         struct se_device *src_dev,
 669         sector_t src_lba,
 670         u32 src_sectors)
 671 {
 672         struct xcopy_pt_cmd *xpt_cmd;
 673         struct se_cmd *se_cmd;
 674         u32 length = (src_sectors * src_dev->dev_attrib.block_size);
 675         int rc;
 676         unsigned char cdb[16];
 677         bool remote_port = (xop->op_origin == XCOL_DEST_RECV_OP);
 678
 679         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 680         if (!xpt_cmd) {
 681                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 682                 return -ENOMEM;
 683         }
 684         init_completion(&xpt_cmd->xpt_passthrough_sem);
 685         se_cmd = &xpt_cmd->se_cmd;
 686
 687         memset(&cdb[0], 0, 16);
 688         cdb[0] = READ_16;
 689         put_unaligned_be64(src_lba, &cdb[2]);
 690         put_unaligned_be32(src_sectors, &cdb[10]);
 691         pr_debug("XCOPY: Built READ_16: LBA: %llu Sectors: %u Length: %u\n",
 692                 (unsigned long long)src_lba, src_sectors, length);
 693
 694         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 695                               DMA_FROM_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 696         xop->src_pt_cmd = xpt_cmd;
 697
 698         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, src_dev, &cdb[0],
 699                                 remote_port, true);
 700         if (rc < 0) {
 701                 transport_generic_free_cmd(se_cmd, 0);
 702                 return rc;
 703         }
 704
 705         xop->xop_data_sg = se_cmd->t_data_sg;
 706         xop->xop_data_nents = se_cmd->t_data_nents;
 707         pr_debug("XCOPY-READ: Saved xop->xop_data_sg: %p, num: %u for READ"
 708                 " memory\n", xop->xop_data_sg, xop->xop_data_nents);
 709
 710         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 711         if (rc < 0) {
 712                 transport_generic_free_cmd(se_cmd, 0);
 713                 return rc;
 714         }
 715         /*
 716          * Clear off the allocated t_data_sg, that has been saved for
 717          * zero-copy WRITE submission reuse in struct xcopy_op..
 718          */
 719         se_cmd->t_data_sg = NULL;
 720         se_cmd->t_data_nents = 0;
 721
 722         return 0;
 723 }
 724
 725 static int target_xcopy_write_destination(
 726         struct se_cmd *ec_cmd,
 727         struct xcopy_op *xop,
 728         struct se_device *dst_dev,
 729         sector_t dst_lba,
 730         u32 dst_sectors)
 731 {
 732         struct xcopy_pt_cmd *xpt_cmd;
 733         struct se_cmd *se_cmd;
 734         u32 length = (dst_sectors * dst_dev->dev_attrib.block_size);
 735         int rc;
 736         unsigned char cdb[16];
 737         bool remote_port = (xop->op_origin == XCOL_SOURCE_RECV_OP);
 738
 739         xpt_cmd = kzalloc(sizeof(struct xcopy_pt_cmd), GFP_KERNEL);
 740         if (!xpt_cmd) {
 741                 pr_err("Unable to allocate xcopy_pt_cmd\n");
 742                 return -ENOMEM;
 743         }
 744         init_completion(&xpt_cmd->xpt_passthrough_sem);
 745         se_cmd = &xpt_cmd->se_cmd;
 746
 747         memset(&cdb[0], 0, 16);
 748         cdb[0] = WRITE_16;
 749         put_unaligned_be64(dst_lba, &cdb[2]);
 750         put_unaligned_be32(dst_sectors, &cdb[10]);
 751         pr_debug("XCOPY: Built WRITE_16: LBA: %llu Sectors: %u Length: %u\n",
 752                 (unsigned long long)dst_lba, dst_sectors, length);
 753
 754         transport_init_se_cmd(se_cmd, &xcopy_pt_tfo, NULL, length,
 755                               DMA_TO_DEVICE, 0, &xpt_cmd->sense_buffer[0]);
 756         xop->dst_pt_cmd = xpt_cmd;
 757
 758         rc = target_xcopy_setup_pt_cmd(xpt_cmd, xop, dst_dev, &cdb[0],
 759                                 remote_port, false);
 760         if (rc < 0) {
 761                 struct se_cmd *src_cmd = &xop->src_pt_cmd->se_cmd;
 762                 /*
 763                  * If the failure happened before the t_mem_list hand-off in
 764                  * target_xcopy_setup_pt_cmd(), Reset memory + clear flag so that
 765                  * core releases this memory on error during X-COPY WRITE I/O.
 766                  */
 767                 src_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 768                 src_cmd->t_data_sg = xop->xop_data_sg;
 769                 src_cmd->t_data_nents = xop->xop_data_nents;
 770
 771                 transport_generic_free_cmd(se_cmd, 0);
 772                 return rc;
 773         }
 774
 775         rc = target_xcopy_issue_pt_cmd(xpt_cmd);
 776         if (rc < 0) {
 777                 se_cmd->se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 778                 transport_generic_free_cmd(se_cmd, 0);
 779                 return rc;
 780         }
 781
 782         return 0;
 783 }
 784
 785 static void target_xcopy_do_work(struct work_struct *work)
 786 {
 787         struct xcopy_op *xop = container_of(work, struct xcopy_op, xop_work);
 788         struct se_device *src_dev = xop->src_dev, *dst_dev = xop->dst_dev;
 789         struct se_cmd *ec_cmd = xop->xop_se_cmd;
 790         sector_t src_lba = xop->src_lba, dst_lba = xop->dst_lba, end_lba;
 791         unsigned int max_sectors;
 792         int rc;
 793         unsigned short nolb = xop->nolb, cur_nolb, max_nolb, copied_nolb = 0;
 794
 795         end_lba = src_lba + nolb;
 796         /*
 797          * Break up XCOPY I/O into hw_max_sectors sized I/O based on the
 798          * smallest max_sectors between src_dev + dev_dev, or
 799          */
 800         max_sectors = min(src_dev->dev_attrib.hw_max_sectors,
 801                           dst_dev->dev_attrib.hw_max_sectors);
 802         max_sectors = min_t(u32, max_sectors, XCOPY_MAX_SECTORS);
 803
 804         max_nolb = min_t(u16, max_sectors, ((u16)(~0U)));
 805
 806         pr_debug("target_xcopy_do_work: nolb: %hu, max_nolb: %hu end_lba: %llu\n",
 807                         nolb, max_nolb, (unsigned long long)end_lba);
 808         pr_debug("target_xcopy_do_work: Starting src_lba: %llu, dst_lba: %llu\n",
 809                         (unsigned long long)src_lba, (unsigned long long)dst_lba);
 810
 811         while (src_lba < end_lba) {
 812                 cur_nolb = min(nolb, max_nolb);
 813
 814                 pr_debug("target_xcopy_do_work: Calling read src_dev: %p src_lba: %llu,"
 815                         " cur_nolb: %hu\n", src_dev, (unsigned long long)src_lba, cur_nolb);
 816
 817                 rc = target_xcopy_read_source(ec_cmd, xop, src_dev, src_lba, cur_nolb);
 818                 if (rc < 0)
 819                         goto out;
 820
 821                 src_lba += cur_nolb;
 822                 pr_debug("target_xcopy_do_work: Incremented READ src_lba to %llu\n",
 823                                 (unsigned long long)src_lba);
 824
 825                 pr_debug("target_xcopy_do_work: Calling write dst_dev: %p dst_lba: %llu,"
 826                         " cur_nolb: %hu\n", dst_dev, (unsigned long long)dst_lba, cur_nolb);
 827
 828                 rc = target_xcopy_write_destination(ec_cmd, xop, dst_dev,
 829                                                 dst_lba, cur_nolb);
 830                 if (rc < 0) {
 831                         transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 832                         goto out;
 833                 }
 834
 835                 dst_lba += cur_nolb;
 836                 pr_debug("target_xcopy_do_work: Incremented WRITE dst_lba to %llu\n",
 837                                 (unsigned long long)dst_lba);
 838
 839                 copied_nolb += cur_nolb;
 840                 nolb -= cur_nolb;
 841
 842                 transport_generic_free_cmd(&xop->src_pt_cmd->se_cmd, 0);
 843                 xop->dst_pt_cmd->se_cmd.se_cmd_flags &= ~SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
 844
 845                 transport_generic_free_cmd(&xop->dst_pt_cmd->se_cmd, 0);
 846         }
 847
 848         xcopy_pt_undepend_remotedev(xop);
 849         kfree(xop);
 850
 851         pr_debug("target_xcopy_do_work: Final src_lba: %llu, dst_lba: %llu\n",
 852                 (unsigned long long)src_lba, (unsigned long long)dst_lba);
 853         pr_debug("target_xcopy_do_work: Blocks copied: %hu, Bytes Copied: %u\n",
 854                 copied_nolb, copied_nolb * dst_dev->dev_attrib.block_size);
 855
 856         pr_debug("target_xcopy_do_work: Setting X-COPY GOOD status -> sending response\n");
 857         target_complete_cmd(ec_cmd, SAM_STAT_GOOD);
 858         return;
 859
 860 out:
 861         xcopy_pt_undepend_remotedev(xop);
 862         kfree(xop);
 863
 864         pr_warn("target_xcopy_do_work: Setting X-COPY CHECK_CONDITION -> sending response\n");
 865         ec_cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
 866         target_complete_cmd(ec_cmd, SAM_STAT_CHECK_CONDITION);
 867 }
 868
 869 sense_reason_t target_do_xcopy(struct se_cmd *se_cmd)
 870 {
 871         struct se_device *dev = se_cmd->se_dev;
 872         struct xcopy_op *xop = NULL;
 873         unsigned char *p = NULL, *seg_desc;
 874         unsigned int list_id, list_id_usage, sdll, inline_dl, sa;
 875         sense_reason_t ret = TCM_INVALID_PARAMETER_LIST;
 876         int rc;
 877         unsigned short tdll;
 878
 879         if (!dev->dev_attrib.emulate_3pc) {
 880                 pr_err("EXTENDED_COPY operation explicitly disabled\n");
 881                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 882         }
 883
 884         sa = se_cmd->t_task_cdb[1] & 0x1f;
 885         if (sa != 0x00) {
 886                 pr_err("EXTENDED_COPY(LID4) not supported\n");
 887                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 888         }
 889
 890         xop = kzalloc(sizeof(struct xcopy_op), GFP_KERNEL);
 891         if (!xop) {
 892                 pr_err("Unable to allocate xcopy_op\n");
 893                 return TCM_OUT_OF_RESOURCES;
 894         }
 895         xop->xop_se_cmd = se_cmd;
 896
 897         p = transport_kmap_data_sg(se_cmd);
 898         if (!p) {
 899                 pr_err("transport_kmap_data_sg() failed in target_do_xcopy\n");
 900                 kfree(xop);
 901                 return TCM_OUT_OF_RESOURCES;
 902         }
 903
 904         list_id = p[0];
 905         list_id_usage = (p[1] & 0x18) >> 3;
 906
 907         /*
 908          * Determine TARGET DESCRIPTOR LIST LENGTH + SEGMENT DESCRIPTOR LIST LENGTH
 909          */
 910         tdll = get_unaligned_be16(&p[2]);
 911         sdll = get_unaligned_be32(&p[8]);
 912
 913         inline_dl = get_unaligned_be32(&p[12]);
 914         if (inline_dl != 0) {
 915                 pr_err("XCOPY with non zero inline data length\n");
 916                 goto out;
 917         }
 918
 919         pr_debug("Processing XCOPY with list_id: 0x%02x list_id_usage: 0x%02x"
 920                 " tdll: %hu sdll: %u inline_dl: %u\n", list_id, list_id_usage,
 921                 tdll, sdll, inline_dl);
 922
 923         rc = target_xcopy_parse_target_descriptors(se_cmd, xop, &p[16], tdll);
 924         if (rc <= 0)
 925                 goto out;
 926
 927         if (xop->src_dev->dev_attrib.block_size !=
 928             xop->dst_dev->dev_attrib.block_size) {
 929                 pr_err("XCOPY: Non matching src_dev block_size: %u + dst_dev"
 930                        " block_size: %u currently unsupported\n",
 931                         xop->src_dev->dev_attrib.block_size,
 932                         xop->dst_dev->dev_attrib.block_size);
 933                 xcopy_pt_undepend_remotedev(xop);
 934                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 935                 goto out;
 936         }
 937
 938         pr_debug("XCOPY: Processed %d target descriptors, length: %u\n", rc,
 939                                 rc * XCOPY_TARGET_DESC_LEN);
 940         seg_desc = &p[16];
 941         seg_desc += (rc * XCOPY_TARGET_DESC_LEN);
 942
 943         rc = target_xcopy_parse_segment_descriptors(se_cmd, xop, seg_desc, sdll);
 944         if (rc <= 0) {
 945                 xcopy_pt_undepend_remotedev(xop);
 946                 goto out;
 947         }
 948         transport_kunmap_data_sg(se_cmd);
 949
 950         pr_debug("XCOPY: Processed %d segment descriptors, length: %u\n", rc,
 951                                 rc * XCOPY_SEGMENT_DESC_LEN);
 952         INIT_WORK(&xop->xop_work, target_xcopy_do_work);
 953         queue_work(xcopy_wq, &xop->xop_work);
 954         return TCM_NO_SENSE;
 955
 956 out:
 957         if (p)
 958                 transport_kunmap_data_sg(se_cmd);
 959         kfree(xop);
 960         return ret;
 961 }
 962
 963 static sense_reason_t target_rcr_operating_parameters(struct se_cmd *se_cmd)
 964 {
 965         unsigned char *p;
 966
 967         p = transport_kmap_data_sg(se_cmd);
 968         if (!p) {
 969                 pr_err("transport_kmap_data_sg failed in"
 970                        " target_rcr_operating_parameters\n");
 971                 return TCM_OUT_OF_RESOURCES;
 972         }
 973
 974         if (se_cmd->data_length < 54) {
 975                 pr_err("Receive Copy Results Op Parameters length"
 976                        " too small: %u\n", se_cmd->data_length);
 977                 transport_kunmap_data_sg(se_cmd);
 978                 return TCM_INVALID_CDB_FIELD;
 979         }
 980         /*
 981          * Set SNLID=1 (Supports no List ID)
 982          */
 983         p[4] = 0x1;
 984         /*
 985          * MAXIMUM TARGET DESCRIPTOR COUNT
 986          */
 987         put_unaligned_be16(RCR_OP_MAX_TARGET_DESC_COUNT, &p[8]);
 988         /*
 989          * MAXIMUM SEGMENT DESCRIPTOR COUNT
 990          */
 991         put_unaligned_be16(RCR_OP_MAX_SG_DESC_COUNT, &p[10]);
 992         /*
 993          * MAXIMUM DESCRIPTOR LIST LENGTH
 994          */
 995         put_unaligned_be32(RCR_OP_MAX_DESC_LIST_LEN, &p[12]);
 996         /*
 997          * MAXIMUM SEGMENT LENGTH
 998          */
 999         put_unaligned_be32(RCR_OP_MAX_SEGMENT_LEN, &p[16]);
1000         /*
1001          * MAXIMUM INLINE DATA LENGTH for SA 0x04 (NOT SUPPORTED)
1002          */
1003         put_unaligned_be32(0x0, &p[20]);
1004         /*
1005          * HELD DATA LIMIT
1006          */
1007         put_unaligned_be32(0x0, &p[24]);
1008         /*
1009          * MAXIMUM STREAM DEVICE TRANSFER SIZE
1010          */
1011         put_unaligned_be32(0x0, &p[28]);
1012         /*
1013          * TOTAL CONCURRENT COPIES
1014          */
1015         put_unaligned_be16(RCR_OP_TOTAL_CONCURR_COPIES, &p[34]);
1016         /*
1017          * MAXIMUM CONCURRENT COPIES
1018          */
1019         p[36] = RCR_OP_MAX_CONCURR_COPIES;
1020         /*
1021          * DATA SEGMENT GRANULARITY (log 2)
1022          */
1023         p[37] = RCR_OP_DATA_SEG_GRAN_LOG2;
1024         /*
1025          * INLINE DATA GRANULARITY log 2)
1026          */
1027         p[38] = RCR_OP_INLINE_DATA_GRAN_LOG2;
1028         /*
1029          * HELD DATA GRANULARITY
1030          */
1031         p[39] = RCR_OP_HELD_DATA_GRAN_LOG2;
1032         /*
1033          * IMPLEMENTED DESCRIPTOR LIST LENGTH
1034          */
1035         p[43] = 0x2;
1036         /*
1037          * List of implemented descriptor type codes (ordered)
1038          */
1039         p[44] = 0x02; /* Copy Block to Block device */
1040         p[45] = 0xe4; /* Identification descriptor target descriptor */
1041
1042         /*
1043          * AVAILABLE DATA (n-3)
1044          */
1045         put_unaligned_be32(42, &p[0]);
1046
1047         transport_kunmap_data_sg(se_cmd);
1048         target_complete_cmd(se_cmd, GOOD);
1049
1050         return TCM_NO_SENSE;
1051 }
1052
1053 sense_reason_t target_do_receive_copy_results(struct se_cmd *se_cmd)
1054 {
1055         unsigned char *cdb = &se_cmd->t_task_cdb[0];
1056         int sa = (cdb[1] & 0x1f), list_id = cdb[2];
1057         sense_reason_t rc = TCM_NO_SENSE;
1058
1059         pr_debug("Entering target_do_receive_copy_results: SA: 0x%02x, List ID:"
1060                 " 0x%02x, AL: %u\n", sa, list_id, se_cmd->data_length);
1061
1062         if (list_id != 0) {
1063                 pr_err("Receive Copy Results with non zero list identifier"
1064                        " not supported\n");
1065                 return TCM_INVALID_CDB_FIELD;
1066         }
1067
1068         switch (sa) {
1069         case RCR_SA_OPERATING_PARAMETERS:
1070                 rc = target_rcr_operating_parameters(se_cmd);
1071                 break;
1072         case RCR_SA_COPY_STATUS:
1073         case RCR_SA_RECEIVE_DATA:
1074         case RCR_SA_FAILED_SEGMENT_DETAILS:
1075         default:
1076                 pr_err("Unsupported SA for receive copy results: 0x%02x\n", sa);
1077                 return TCM_INVALID_CDB_FIELD;
1078         }
1079
1080         return rc;
1081 }