drivers/target/loopback/tcm_loop.c

   1 /*******************************************************************************
   2  *
   3  * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
   4  * for emulated SAS initiator ports
   5  *
   6  * © Copyright 2011-2013 Datera, Inc.
   7  *
   8  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   9  *
  10  * Author: Nicholas A. Bellinger <nab@risingtidesystems.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 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/types.h>
  28 #include <linux/configfs.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_cmnd.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_fabric.h>
  37
  38 #include "tcm_loop.h"
  39
  40 #define to_tcm_loop_hba(hba)    container_of(hba, struct tcm_loop_hba, dev)
  41
  42 static struct workqueue_struct *tcm_loop_workqueue;
  43 static struct kmem_cache *tcm_loop_cmd_cache;
  44
  45 static int tcm_loop_hba_no_cnt;
  46
  47 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
  48
  49 /*
  50  * Called from struct target_core_fabric_ops->check_stop_free()
  51  */
  52 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
  53 {
  54         return transport_generic_free_cmd(se_cmd, 0);
  55 }
  56
  57 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
  58 {
  59         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
  60                                 struct tcm_loop_cmd, tl_se_cmd);
  61
  62         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
  63 }
  64
  65 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
  66 {
  67         seq_puts(m, "tcm_loop_proc_info()\n");
  68         return 0;
  69 }
  70
  71 static int tcm_loop_driver_probe(struct device *);
  72 static int tcm_loop_driver_remove(struct device *);
  73
  74 static int pseudo_lld_bus_match(struct device *dev,
  75                                 struct device_driver *dev_driver)
  76 {
  77         return 1;
  78 }
  79
  80 static struct bus_type tcm_loop_lld_bus = {
  81         .name                   = "tcm_loop_bus",
  82         .match                  = pseudo_lld_bus_match,
  83         .probe                  = tcm_loop_driver_probe,
  84         .remove                 = tcm_loop_driver_remove,
  85 };
  86
  87 static struct device_driver tcm_loop_driverfs = {
  88         .name                   = "tcm_loop",
  89         .bus                    = &tcm_loop_lld_bus,
  90 };
  91 /*
  92  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
  93  */
  94 static struct device *tcm_loop_primary;
  95
  96 static void tcm_loop_submission_work(struct work_struct *work)
  97 {
  98         struct tcm_loop_cmd *tl_cmd =
  99                 container_of(work, struct tcm_loop_cmd, work);
 100         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
 101         struct scsi_cmnd *sc = tl_cmd->sc;
 102         struct tcm_loop_nexus *tl_nexus;
 103         struct tcm_loop_hba *tl_hba;
 104         struct tcm_loop_tpg *tl_tpg;
 105         struct scatterlist *sgl_bidi = NULL;
 106         u32 sgl_bidi_count = 0, transfer_length;
 107         int rc;
 108
 109         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 110         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 111
 112         /*
 113          * Ensure that this tl_tpg reference from the incoming sc->device->id
 114          * has already been configured via tcm_loop_make_naa_tpg().
 115          */
 116         if (!tl_tpg->tl_hba) {
 117                 set_host_byte(sc, DID_NO_CONNECT);
 118                 goto out_done;
 119         }
 120         if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
 121                 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 122                 goto out_done;
 123         }
 124         tl_nexus = tl_tpg->tl_nexus;
 125         if (!tl_nexus) {
 126                 scmd_printk(KERN_ERR, sc,
 127                             "TCM_Loop I_T Nexus does not exist\n");
 128                 set_host_byte(sc, DID_ERROR);
 129                 goto out_done;
 130         }
 131         if (scsi_bidi_cmnd(sc)) {
 132                 struct scsi_data_buffer *sdb = scsi_in(sc);
 133
 134                 sgl_bidi = sdb->table.sgl;
 135                 sgl_bidi_count = sdb->table.nents;
 136                 se_cmd->se_cmd_flags |= SCF_BIDI;
 137
 138         }
 139
 140         transfer_length = scsi_transfer_length(sc);
 141         if (!scsi_prot_sg_count(sc) &&
 142             scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
 143                 se_cmd->prot_pto = true;
 144                 /*
 145                  * loopback transport doesn't support
 146                  * WRITE_GENERATE, READ_STRIP protection
 147                  * information operations, go ahead unprotected.
 148                  */
 149                 transfer_length = scsi_bufflen(sc);
 150         }
 151
 152         se_cmd->tag = tl_cmd->sc_cmd_tag;
 153         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
 154                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
 155                         transfer_length, TCM_SIMPLE_TAG,
 156                         sc->sc_data_direction, 0,
 157                         scsi_sglist(sc), scsi_sg_count(sc),
 158                         sgl_bidi, sgl_bidi_count,
 159                         scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
 160         if (rc < 0) {
 161                 set_host_byte(sc, DID_NO_CONNECT);
 162                 goto out_done;
 163         }
 164         return;
 165
 166 out_done:
 167         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 168         sc->scsi_done(sc);
 169 }
 170
 171 /*
 172  * ->queuecommand can be and usually is called from interrupt context, so
 173  * defer the actual submission to a workqueue.
 174  */
 175 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
 176 {
 177         struct tcm_loop_cmd *tl_cmd;
 178
 179         pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
 180                  __func__, sc->device->host->host_no, sc->device->id,
 181                  sc->device->channel, sc->device->lun, sc->cmnd[0],
 182                  scsi_bufflen(sc));
 183
 184         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
 185         if (!tl_cmd) {
 186                 set_host_byte(sc, DID_ERROR);
 187                 sc->scsi_done(sc);
 188                 return 0;
 189         }
 190
 191         tl_cmd->sc = sc;
 192         tl_cmd->sc_cmd_tag = sc->request->tag;
 193         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
 194         queue_work(tcm_loop_workqueue, &tl_cmd->work);
 195         return 0;
 196 }
 197
 198 /*
 199  * Called from SCSI EH process context to issue a LUN_RESET TMR
 200  * to struct scsi_device
 201  */
 202 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 203                               u64 lun, int task, enum tcm_tmreq_table tmr)
 204 {
 205         struct se_cmd *se_cmd;
 206         struct se_session *se_sess;
 207         struct tcm_loop_nexus *tl_nexus;
 208         struct tcm_loop_cmd *tl_cmd;
 209         int ret = TMR_FUNCTION_FAILED, rc;
 210
 211         /*
 212          * Locate the tl_nexus and se_sess pointers
 213          */
 214         tl_nexus = tl_tpg->tl_nexus;
 215         if (!tl_nexus) {
 216                 pr_err("Unable to perform device reset without active I_T Nexus\n");
 217                 return ret;
 218         }
 219
 220         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 221         if (!tl_cmd)
 222                 return ret;
 223
 224         init_completion(&tl_cmd->tmr_done);
 225
 226         se_cmd = &tl_cmd->tl_se_cmd;
 227         se_sess = tl_tpg->tl_nexus->se_sess;
 228
 229         rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
 230                                NULL, tmr, GFP_KERNEL, task,
 231                                TARGET_SCF_ACK_KREF);
 232         if (rc < 0)
 233                 goto release;
 234         wait_for_completion(&tl_cmd->tmr_done);
 235         ret = se_cmd->se_tmr_req->response;
 236         target_put_sess_cmd(se_cmd);
 237
 238 out:
 239         return ret;
 240
 241 release:
 242         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 243         goto out;
 244 }
 245
 246 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 247 {
 248         struct tcm_loop_hba *tl_hba;
 249         struct tcm_loop_tpg *tl_tpg;
 250         int ret = FAILED;
 251
 252         /*
 253          * Locate the tcm_loop_hba_t pointer
 254          */
 255         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 256         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 257         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 258                                  sc->request->tag, TMR_ABORT_TASK);
 259         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 260 }
 261
 262 /*
 263  * Called from SCSI EH process context to issue a LUN_RESET TMR
 264  * to struct scsi_device
 265  */
 266 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 267 {
 268         struct tcm_loop_hba *tl_hba;
 269         struct tcm_loop_tpg *tl_tpg;
 270         int ret = FAILED;
 271
 272         /*
 273          * Locate the tcm_loop_hba_t pointer
 274          */
 275         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 276         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 277
 278         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 279                                  0, TMR_LUN_RESET);
 280         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 281 }
 282
 283 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 284 {
 285         struct tcm_loop_hba *tl_hba;
 286         struct tcm_loop_tpg *tl_tpg;
 287
 288         /*
 289          * Locate the tcm_loop_hba_t pointer
 290          */
 291         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 292         if (!tl_hba) {
 293                 pr_err("Unable to perform device reset without active I_T Nexus\n");
 294                 return FAILED;
 295         }
 296         /*
 297          * Locate the tl_tpg pointer from TargetID in sc->device->id
 298          */
 299         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 300         if (tl_tpg) {
 301                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 302                 return SUCCESS;
 303         }
 304         return FAILED;
 305 }
 306
 307 static int tcm_loop_slave_alloc(struct scsi_device *sd)
 308 {
 309         blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
 310         return 0;
 311 }
 312
 313 static struct scsi_host_template tcm_loop_driver_template = {
 314         .show_info              = tcm_loop_show_info,
 315         .proc_name              = "tcm_loopback",
 316         .name                   = "TCM_Loopback",
 317         .queuecommand           = tcm_loop_queuecommand,
 318         .change_queue_depth     = scsi_change_queue_depth,
 319         .eh_abort_handler = tcm_loop_abort_task,
 320         .eh_device_reset_handler = tcm_loop_device_reset,
 321         .eh_target_reset_handler = tcm_loop_target_reset,
 322         .can_queue              = 1024,
 323         .this_id                = -1,
 324         .sg_tablesize           = 256,
 325         .cmd_per_lun            = 1024,
 326         .max_sectors            = 0xFFFF,
 327         .use_clustering         = DISABLE_CLUSTERING,
 328         .slave_alloc            = tcm_loop_slave_alloc,
 329         .module                 = THIS_MODULE,
 330         .track_queue_depth      = 1,
 331 };
 332
 333 static int tcm_loop_driver_probe(struct device *dev)
 334 {
 335         struct tcm_loop_hba *tl_hba;
 336         struct Scsi_Host *sh;
 337         int error, host_prot;
 338
 339         tl_hba = to_tcm_loop_hba(dev);
 340
 341         sh = scsi_host_alloc(&tcm_loop_driver_template,
 342                         sizeof(struct tcm_loop_hba));
 343         if (!sh) {
 344                 pr_err("Unable to allocate struct scsi_host\n");
 345                 return -ENODEV;
 346         }
 347         tl_hba->sh = sh;
 348
 349         /*
 350          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 351          */
 352         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 353         /*
 354          * Setup single ID, Channel and LUN for now..
 355          */
 356         sh->max_id = 2;
 357         sh->max_lun = 0;
 358         sh->max_channel = 0;
 359         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 360
 361         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 362                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 363                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 364
 365         scsi_host_set_prot(sh, host_prot);
 366         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 367
 368         error = scsi_add_host(sh, &tl_hba->dev);
 369         if (error) {
 370                 pr_err("%s: scsi_add_host failed\n", __func__);
 371                 scsi_host_put(sh);
 372                 return -ENODEV;
 373         }
 374         return 0;
 375 }
 376
 377 static int tcm_loop_driver_remove(struct device *dev)
 378 {
 379         struct tcm_loop_hba *tl_hba;
 380         struct Scsi_Host *sh;
 381
 382         tl_hba = to_tcm_loop_hba(dev);
 383         sh = tl_hba->sh;
 384
 385         scsi_remove_host(sh);
 386         scsi_host_put(sh);
 387         return 0;
 388 }
 389
 390 static void tcm_loop_release_adapter(struct device *dev)
 391 {
 392         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 393
 394         kfree(tl_hba);
 395 }
 396
 397 /*
 398  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 399  */
 400 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 401 {
 402         int ret;
 403
 404         tl_hba->dev.bus = &tcm_loop_lld_bus;
 405         tl_hba->dev.parent = tcm_loop_primary;
 406         tl_hba->dev.release = &tcm_loop_release_adapter;
 407         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 408
 409         ret = device_register(&tl_hba->dev);
 410         if (ret) {
 411                 pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
 412                 put_device(&tl_hba->dev);
 413                 return -ENODEV;
 414         }
 415
 416         return 0;
 417 }
 418
 419 /*
 420  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 421  * tcm_loop SCSI bus.
 422  */
 423 static int tcm_loop_alloc_core_bus(void)
 424 {
 425         int ret;
 426
 427         tcm_loop_primary = root_device_register("tcm_loop_0");
 428         if (IS_ERR(tcm_loop_primary)) {
 429                 pr_err("Unable to allocate tcm_loop_primary\n");
 430                 return PTR_ERR(tcm_loop_primary);
 431         }
 432
 433         ret = bus_register(&tcm_loop_lld_bus);
 434         if (ret) {
 435                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 436                 goto dev_unreg;
 437         }
 438
 439         ret = driver_register(&tcm_loop_driverfs);
 440         if (ret) {
 441                 pr_err("driver_register() failed for tcm_loop_driverfs\n");
 442                 goto bus_unreg;
 443         }
 444
 445         pr_debug("Initialized TCM Loop Core Bus\n");
 446         return ret;
 447
 448 bus_unreg:
 449         bus_unregister(&tcm_loop_lld_bus);
 450 dev_unreg:
 451         root_device_unregister(tcm_loop_primary);
 452         return ret;
 453 }
 454
 455 static void tcm_loop_release_core_bus(void)
 456 {
 457         driver_unregister(&tcm_loop_driverfs);
 458         bus_unregister(&tcm_loop_lld_bus);
 459         root_device_unregister(tcm_loop_primary);
 460
 461         pr_debug("Releasing TCM Loop Core BUS\n");
 462 }
 463
 464 static char *tcm_loop_get_fabric_name(void)
 465 {
 466         return "loopback";
 467 }
 468
 469 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 470 {
 471         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 472 }
 473
 474 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 475 {
 476         /*
 477          * Return the passed NAA identifier for the Target Port
 478          */
 479         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 480 }
 481
 482 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 483 {
 484         /*
 485          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 486          * to represent the SCSI Target Port.
 487          */
 488         return tl_tpg(se_tpg)->tl_tpgt;
 489 }
 490
 491 /*
 492  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 493  * based upon the incoming fabric dependent SCSI Initiator Port
 494  */
 495 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 496 {
 497         return 1;
 498 }
 499
 500 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 501 {
 502         return 0;
 503 }
 504
 505 /*
 506  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 507  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 508  */
 509 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 510 {
 511         return 0;
 512 }
 513
 514 /*
 515  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 516  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 517  * It has been added here as a nop for target_fabric_tf_ops_check()
 518  */
 519 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 520 {
 521         return 0;
 522 }
 523
 524 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 525 {
 526         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 527                                                    tl_se_tpg);
 528         return tl_tpg->tl_fabric_prot_type;
 529 }
 530
 531 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 532 {
 533         return 1;
 534 }
 535
 536 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 537 {
 538         return 1;
 539 }
 540
 541 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 542 {
 543         return;
 544 }
 545
 546 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 547 {
 548         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 549                         struct tcm_loop_cmd, tl_se_cmd);
 550
 551         return tl_cmd->sc_cmd_state;
 552 }
 553
 554 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 555 {
 556         /*
 557          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 558          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 559          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 560          * format with transport_generic_map_mem_to_cmd().
 561          *
 562          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 563          * object execution queue.
 564          */
 565         target_execute_cmd(se_cmd);
 566         return 0;
 567 }
 568
 569 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 570 {
 571         return 0;
 572 }
 573
 574 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 575 {
 576         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 577                                 struct tcm_loop_cmd, tl_se_cmd);
 578         struct scsi_cmnd *sc = tl_cmd->sc;
 579
 580         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 581                  __func__, sc, sc->cmnd[0]);
 582
 583         sc->result = SAM_STAT_GOOD;
 584         set_host_byte(sc, DID_OK);
 585         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 586             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 587                 scsi_set_resid(sc, se_cmd->residual_count);
 588         sc->scsi_done(sc);
 589         return 0;
 590 }
 591
 592 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 593 {
 594         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 595                                 struct tcm_loop_cmd, tl_se_cmd);
 596         struct scsi_cmnd *sc = tl_cmd->sc;
 597
 598         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 599                  __func__, sc, sc->cmnd[0]);
 600
 601         if (se_cmd->sense_buffer &&
 602            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 603             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 604
 605                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 606                                 SCSI_SENSE_BUFFERSIZE);
 607                 sc->result = SAM_STAT_CHECK_CONDITION;
 608                 set_driver_byte(sc, DRIVER_SENSE);
 609         } else
 610                 sc->result = se_cmd->scsi_status;
 611
 612         set_host_byte(sc, DID_OK);
 613         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 614             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 615                 scsi_set_resid(sc, se_cmd->residual_count);
 616         sc->scsi_done(sc);
 617         return 0;
 618 }
 619
 620 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 621 {
 622         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 623                                 struct tcm_loop_cmd, tl_se_cmd);
 624
 625         /* Wake up tcm_loop_issue_tmr(). */
 626         complete(&tl_cmd->tmr_done);
 627 }
 628
 629 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 630 {
 631         return;
 632 }
 633
 634 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 635 {
 636         switch (tl_hba->tl_proto_id) {
 637         case SCSI_PROTOCOL_SAS:
 638                 return "SAS";
 639         case SCSI_PROTOCOL_FCP:
 640                 return "FCP";
 641         case SCSI_PROTOCOL_ISCSI:
 642                 return "iSCSI";
 643         default:
 644                 break;
 645         }
 646
 647         return "Unknown";
 648 }
 649
 650 /* Start items for tcm_loop_port_cit */
 651
 652 static int tcm_loop_port_link(
 653         struct se_portal_group *se_tpg,
 654         struct se_lun *lun)
 655 {
 656         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 657                                 struct tcm_loop_tpg, tl_se_tpg);
 658         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 659
 660         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 661         /*
 662          * Add Linux/SCSI struct scsi_device by HCTL
 663          */
 664         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 665
 666         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 667         return 0;
 668 }
 669
 670 static void tcm_loop_port_unlink(
 671         struct se_portal_group *se_tpg,
 672         struct se_lun *se_lun)
 673 {
 674         struct scsi_device *sd;
 675         struct tcm_loop_hba *tl_hba;
 676         struct tcm_loop_tpg *tl_tpg;
 677
 678         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 679         tl_hba = tl_tpg->tl_hba;
 680
 681         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 682                                 se_lun->unpacked_lun);
 683         if (!sd) {
 684                 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
 685                        0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 686                 return;
 687         }
 688         /*
 689          * Remove Linux/SCSI struct scsi_device by HCTL
 690          */
 691         scsi_remove_device(sd);
 692         scsi_device_put(sd);
 693
 694         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 695
 696         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 697 }
 698
 699 /* End items for tcm_loop_port_cit */
 700
 701 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 702                 struct config_item *item, char *page)
 703 {
 704         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 705         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 706                                                    tl_se_tpg);
 707
 708         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 709 }
 710
 711 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 712                 struct config_item *item, const char *page, size_t count)
 713 {
 714         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 715         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 716                                                    tl_se_tpg);
 717         unsigned long val;
 718         int ret = kstrtoul(page, 0, &val);
 719
 720         if (ret) {
 721                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 722                 return ret;
 723         }
 724         if (val != 0 && val != 1 && val != 3) {
 725                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 726                 return -EINVAL;
 727         }
 728         tl_tpg->tl_fabric_prot_type = val;
 729
 730         return count;
 731 }
 732
 733 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 734
 735 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 736         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 737         NULL,
 738 };
 739
 740 /* Start items for tcm_loop_nexus_cit */
 741
 742 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
 743                                   struct se_session *se_sess, void *p)
 744 {
 745         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 746                                         struct tcm_loop_tpg, tl_se_tpg);
 747
 748         tl_tpg->tl_nexus = p;
 749         return 0;
 750 }
 751
 752 static int tcm_loop_make_nexus(
 753         struct tcm_loop_tpg *tl_tpg,
 754         const char *name)
 755 {
 756         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 757         struct tcm_loop_nexus *tl_nexus;
 758         int ret;
 759
 760         if (tl_tpg->tl_nexus) {
 761                 pr_debug("tl_tpg->tl_nexus already exists\n");
 762                 return -EEXIST;
 763         }
 764
 765         tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
 766         if (!tl_nexus)
 767                 return -ENOMEM;
 768
 769         tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
 770                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
 771                                         name, tl_nexus, tcm_loop_alloc_sess_cb);
 772         if (IS_ERR(tl_nexus->se_sess)) {
 773                 ret = PTR_ERR(tl_nexus->se_sess);
 774                 kfree(tl_nexus);
 775                 return ret;
 776         }
 777
 778         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
 779                  tcm_loop_dump_proto_id(tl_hba), name);
 780         return 0;
 781 }
 782
 783 static int tcm_loop_drop_nexus(
 784         struct tcm_loop_tpg *tpg)
 785 {
 786         struct se_session *se_sess;
 787         struct tcm_loop_nexus *tl_nexus;
 788
 789         tl_nexus = tpg->tl_nexus;
 790         if (!tl_nexus)
 791                 return -ENODEV;
 792
 793         se_sess = tl_nexus->se_sess;
 794         if (!se_sess)
 795                 return -ENODEV;
 796
 797         if (atomic_read(&tpg->tl_tpg_port_count)) {
 798                 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
 799                        atomic_read(&tpg->tl_tpg_port_count));
 800                 return -EPERM;
 801         }
 802
 803         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
 804                  tcm_loop_dump_proto_id(tpg->tl_hba),
 805                  tl_nexus->se_sess->se_node_acl->initiatorname);
 806         /*
 807          * Release the SCSI I_T Nexus to the emulated Target Port
 808          */
 809         target_remove_session(se_sess);
 810         tpg->tl_nexus = NULL;
 811         kfree(tl_nexus);
 812         return 0;
 813 }
 814
 815 /* End items for tcm_loop_nexus_cit */
 816
 817 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 818 {
 819         struct se_portal_group *se_tpg = to_tpg(item);
 820         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 821                         struct tcm_loop_tpg, tl_se_tpg);
 822         struct tcm_loop_nexus *tl_nexus;
 823         ssize_t ret;
 824
 825         tl_nexus = tl_tpg->tl_nexus;
 826         if (!tl_nexus)
 827                 return -ENODEV;
 828
 829         ret = snprintf(page, PAGE_SIZE, "%s\n",
 830                 tl_nexus->se_sess->se_node_acl->initiatorname);
 831
 832         return ret;
 833 }
 834
 835 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 836                 const char *page, size_t count)
 837 {
 838         struct se_portal_group *se_tpg = to_tpg(item);
 839         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 840                         struct tcm_loop_tpg, tl_se_tpg);
 841         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 842         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 843         int ret;
 844         /*
 845          * Shutdown the active I_T nexus if 'NULL' is passed..
 846          */
 847         if (!strncmp(page, "NULL", 4)) {
 848                 ret = tcm_loop_drop_nexus(tl_tpg);
 849                 return (!ret) ? count : ret;
 850         }
 851         /*
 852          * Otherwise make sure the passed virtual Initiator port WWN matches
 853          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 854          * tcm_loop_make_nexus()
 855          */
 856         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 857                 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
 858                        page, TL_WWN_ADDR_LEN);
 859                 return -EINVAL;
 860         }
 861         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 862
 863         ptr = strstr(i_port, "naa.");
 864         if (ptr) {
 865                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 866                         pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
 867                                i_port, tcm_loop_dump_proto_id(tl_hba));
 868                         return -EINVAL;
 869                 }
 870                 port_ptr = &i_port[0];
 871                 goto check_newline;
 872         }
 873         ptr = strstr(i_port, "fc.");
 874         if (ptr) {
 875                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 876                         pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
 877                                i_port, tcm_loop_dump_proto_id(tl_hba));
 878                         return -EINVAL;
 879                 }
 880                 port_ptr = &i_port[3]; /* Skip over "fc." */
 881                 goto check_newline;
 882         }
 883         ptr = strstr(i_port, "iqn.");
 884         if (ptr) {
 885                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 886                         pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
 887                                i_port, tcm_loop_dump_proto_id(tl_hba));
 888                         return -EINVAL;
 889                 }
 890                 port_ptr = &i_port[0];
 891                 goto check_newline;
 892         }
 893         pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
 894                i_port);
 895         return -EINVAL;
 896         /*
 897          * Clear any trailing newline for the NAA WWN
 898          */
 899 check_newline:
 900         if (i_port[strlen(i_port)-1] == '\n')
 901                 i_port[strlen(i_port)-1] = '\0';
 902
 903         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 904         if (ret < 0)
 905                 return ret;
 906
 907         return count;
 908 }
 909
 910 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 911                 char *page)
 912 {
 913         struct se_portal_group *se_tpg = to_tpg(item);
 914         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 915                         struct tcm_loop_tpg, tl_se_tpg);
 916         const char *status = NULL;
 917         ssize_t ret = -EINVAL;
 918
 919         switch (tl_tpg->tl_transport_status) {
 920         case TCM_TRANSPORT_ONLINE:
 921                 status = "online";
 922                 break;
 923         case TCM_TRANSPORT_OFFLINE:
 924                 status = "offline";
 925                 break;
 926         default:
 927                 break;
 928         }
 929
 930         if (status)
 931                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 932
 933         return ret;
 934 }
 935
 936 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
 937                 const char *page, size_t count)
 938 {
 939         struct se_portal_group *se_tpg = to_tpg(item);
 940         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 941                         struct tcm_loop_tpg, tl_se_tpg);
 942
 943         if (!strncmp(page, "online", 6)) {
 944                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 945                 return count;
 946         }
 947         if (!strncmp(page, "offline", 7)) {
 948                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
 949                 if (tl_tpg->tl_nexus) {
 950                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 951
 952                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
 953                 }
 954                 return count;
 955         }
 956         return -EINVAL;
 957 }
 958
 959 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
 960                                          char *page)
 961 {
 962         struct se_portal_group *se_tpg = to_tpg(item);
 963         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 964                         struct tcm_loop_tpg, tl_se_tpg);
 965         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 966
 967         return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
 968                         tl_hba->sh->host_no, tl_tpg->tl_tpgt);
 969 }
 970
 971 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
 972 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
 973 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 974
 975 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
 976         &tcm_loop_tpg_attr_nexus,
 977         &tcm_loop_tpg_attr_transport_status,
 978         &tcm_loop_tpg_attr_address,
 979         NULL,
 980 };
 981
 982 /* Start items for tcm_loop_naa_cit */
 983
 984 static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
 985                                                      const char *name)
 986 {
 987         struct tcm_loop_hba *tl_hba = container_of(wwn,
 988                         struct tcm_loop_hba, tl_hba_wwn);
 989         struct tcm_loop_tpg *tl_tpg;
 990         int ret;
 991         unsigned long tpgt;
 992
 993         if (strstr(name, "tpgt_") != name) {
 994                 pr_err("Unable to locate \"tpgt_#\" directory group\n");
 995                 return ERR_PTR(-EINVAL);
 996         }
 997         if (kstrtoul(name+5, 10, &tpgt))
 998                 return ERR_PTR(-EINVAL);
 999
1000         if (tpgt >= TL_TPGS_PER_HBA) {
1001                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
1002                        tpgt, TL_TPGS_PER_HBA);
1003                 return ERR_PTR(-EINVAL);
1004         }
1005         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1006         tl_tpg->tl_hba = tl_hba;
1007         tl_tpg->tl_tpgt = tpgt;
1008         /*
1009          * Register the tl_tpg as a emulated TCM Target Endpoint
1010          */
1011         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1012         if (ret < 0)
1013                 return ERR_PTR(-ENOMEM);
1014
1015         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
1016                  tcm_loop_dump_proto_id(tl_hba),
1017                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1018         return &tl_tpg->tl_se_tpg;
1019 }
1020
1021 static void tcm_loop_drop_naa_tpg(
1022         struct se_portal_group *se_tpg)
1023 {
1024         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1025         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1026                                 struct tcm_loop_tpg, tl_se_tpg);
1027         struct tcm_loop_hba *tl_hba;
1028         unsigned short tpgt;
1029
1030         tl_hba = tl_tpg->tl_hba;
1031         tpgt = tl_tpg->tl_tpgt;
1032         /*
1033          * Release the I_T Nexus for the Virtual target link if present
1034          */
1035         tcm_loop_drop_nexus(tl_tpg);
1036         /*
1037          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1038          */
1039         core_tpg_deregister(se_tpg);
1040
1041         tl_tpg->tl_hba = NULL;
1042         tl_tpg->tl_tpgt = 0;
1043
1044         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1045                  tcm_loop_dump_proto_id(tl_hba),
1046                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1047 }
1048
1049 /* End items for tcm_loop_naa_cit */
1050
1051 /* Start items for tcm_loop_cit */
1052
1053 static struct se_wwn *tcm_loop_make_scsi_hba(
1054         struct target_fabric_configfs *tf,
1055         struct config_group *group,
1056         const char *name)
1057 {
1058         struct tcm_loop_hba *tl_hba;
1059         struct Scsi_Host *sh;
1060         char *ptr;
1061         int ret, off = 0;
1062
1063         tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1064         if (!tl_hba)
1065                 return ERR_PTR(-ENOMEM);
1066
1067         /*
1068          * Determine the emulated Protocol Identifier and Target Port Name
1069          * based on the incoming configfs directory name.
1070          */
1071         ptr = strstr(name, "naa.");
1072         if (ptr) {
1073                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1074                 goto check_len;
1075         }
1076         ptr = strstr(name, "fc.");
1077         if (ptr) {
1078                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1079                 off = 3; /* Skip over "fc." */
1080                 goto check_len;
1081         }
1082         ptr = strstr(name, "iqn.");
1083         if (!ptr) {
1084                 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1085                        name);
1086                 ret = -EINVAL;
1087                 goto out;
1088         }
1089         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1090
1091 check_len:
1092         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1093                 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1094                        name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1095                 ret = -EINVAL;
1096                 goto out;
1097         }
1098         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1099
1100         /*
1101          * Call device_register(tl_hba->dev) to register the emulated
1102          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1103          * device_register() callbacks in tcm_loop_driver_probe()
1104          */
1105         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1106         if (ret)
1107                 return ERR_PTR(ret);
1108
1109         sh = tl_hba->sh;
1110         tcm_loop_hba_no_cnt++;
1111         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1112                  tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1113         return &tl_hba->tl_hba_wwn;
1114 out:
1115         kfree(tl_hba);
1116         return ERR_PTR(ret);
1117 }
1118
1119 static void tcm_loop_drop_scsi_hba(
1120         struct se_wwn *wwn)
1121 {
1122         struct tcm_loop_hba *tl_hba = container_of(wwn,
1123                                 struct tcm_loop_hba, tl_hba_wwn);
1124
1125         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1126                  tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1127                  tl_hba->sh->host_no);
1128         /*
1129          * Call device_unregister() on the original tl_hba->dev.
1130          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1131          * release *tl_hba;
1132          */
1133         device_unregister(&tl_hba->dev);
1134 }
1135
1136 /* Start items for tcm_loop_cit */
1137 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1138 {
1139         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1140 }
1141
1142 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1143
1144 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1145         &tcm_loop_wwn_attr_version,
1146         NULL,
1147 };
1148
1149 /* End items for tcm_loop_cit */
1150
1151 static const struct target_core_fabric_ops loop_ops = {
1152         .module                         = THIS_MODULE,
1153         .name                           = "loopback",
1154         .get_fabric_name                = tcm_loop_get_fabric_name,
1155         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1156         .tpg_get_tag                    = tcm_loop_get_tag,
1157         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1158         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1159         .tpg_check_demo_mode_write_protect =
1160                                 tcm_loop_check_demo_mode_write_protect,
1161         .tpg_check_prod_mode_write_protect =
1162                                 tcm_loop_check_prod_mode_write_protect,
1163         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1164         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1165         .check_stop_free                = tcm_loop_check_stop_free,
1166         .release_cmd                    = tcm_loop_release_cmd,
1167         .sess_get_index                 = tcm_loop_sess_get_index,
1168         .write_pending                  = tcm_loop_write_pending,
1169         .write_pending_status           = tcm_loop_write_pending_status,
1170         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1171         .get_cmd_state                  = tcm_loop_get_cmd_state,
1172         .queue_data_in                  = tcm_loop_queue_data_in,
1173         .queue_status                   = tcm_loop_queue_status,
1174         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1175         .aborted_task                   = tcm_loop_aborted_task,
1176         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1177         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1178         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1179         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1180         .fabric_post_link               = tcm_loop_port_link,
1181         .fabric_pre_unlink              = tcm_loop_port_unlink,
1182         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1183         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1184         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1185 };
1186
1187 static int __init tcm_loop_fabric_init(void)
1188 {
1189         int ret = -ENOMEM;
1190
1191         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1192         if (!tcm_loop_workqueue)
1193                 goto out;
1194
1195         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1196                                 sizeof(struct tcm_loop_cmd),
1197                                 __alignof__(struct tcm_loop_cmd),
1198                                 0, NULL);
1199         if (!tcm_loop_cmd_cache) {
1200                 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1201                 goto out_destroy_workqueue;
1202         }
1203
1204         ret = tcm_loop_alloc_core_bus();
1205         if (ret)
1206                 goto out_destroy_cache;
1207
1208         ret = target_register_template(&loop_ops);
1209         if (ret)
1210                 goto out_release_core_bus;
1211
1212         return 0;
1213
1214 out_release_core_bus:
1215         tcm_loop_release_core_bus();
1216 out_destroy_cache:
1217         kmem_cache_destroy(tcm_loop_cmd_cache);
1218 out_destroy_workqueue:
1219         destroy_workqueue(tcm_loop_workqueue);
1220 out:
1221         return ret;
1222 }
1223
1224 static void __exit tcm_loop_fabric_exit(void)
1225 {
1226         target_unregister_template(&loop_ops);
1227         tcm_loop_release_core_bus();
1228         kmem_cache_destroy(tcm_loop_cmd_cache);
1229         destroy_workqueue(tcm_loop_workqueue);
1230 }
1231
1232 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1233 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1234 MODULE_LICENSE("GPL");
1235 module_init(tcm_loop_fabric_init);
1236 module_exit(tcm_loop_fabric_exit);