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                 return -ENODEV;
 413         }
 414
 415         return 0;
 416 }
 417
 418 /*
 419  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 420  * tcm_loop SCSI bus.
 421  */
 422 static int tcm_loop_alloc_core_bus(void)
 423 {
 424         int ret;
 425
 426         tcm_loop_primary = root_device_register("tcm_loop_0");
 427         if (IS_ERR(tcm_loop_primary)) {
 428                 pr_err("Unable to allocate tcm_loop_primary\n");
 429                 return PTR_ERR(tcm_loop_primary);
 430         }
 431
 432         ret = bus_register(&tcm_loop_lld_bus);
 433         if (ret) {
 434                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 435                 goto dev_unreg;
 436         }
 437
 438         ret = driver_register(&tcm_loop_driverfs);
 439         if (ret) {
 440                 pr_err("driver_register() failed for tcm_loop_driverfs\n");
 441                 goto bus_unreg;
 442         }
 443
 444         pr_debug("Initialized TCM Loop Core Bus\n");
 445         return ret;
 446
 447 bus_unreg:
 448         bus_unregister(&tcm_loop_lld_bus);
 449 dev_unreg:
 450         root_device_unregister(tcm_loop_primary);
 451         return ret;
 452 }
 453
 454 static void tcm_loop_release_core_bus(void)
 455 {
 456         driver_unregister(&tcm_loop_driverfs);
 457         bus_unregister(&tcm_loop_lld_bus);
 458         root_device_unregister(tcm_loop_primary);
 459
 460         pr_debug("Releasing TCM Loop Core BUS\n");
 461 }
 462
 463 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 464 {
 465         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 466 }
 467
 468 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 469 {
 470         /*
 471          * Return the passed NAA identifier for the Target Port
 472          */
 473         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 474 }
 475
 476 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 477 {
 478         /*
 479          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 480          * to represent the SCSI Target Port.
 481          */
 482         return tl_tpg(se_tpg)->tl_tpgt;
 483 }
 484
 485 /*
 486  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 487  * based upon the incoming fabric dependent SCSI Initiator Port
 488  */
 489 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 490 {
 491         return 1;
 492 }
 493
 494 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 495 {
 496         return 0;
 497 }
 498
 499 /*
 500  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 501  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 502  */
 503 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 504 {
 505         return 0;
 506 }
 507
 508 /*
 509  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 510  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 511  * It has been added here as a nop for target_fabric_tf_ops_check()
 512  */
 513 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 514 {
 515         return 0;
 516 }
 517
 518 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 519 {
 520         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 521                                                    tl_se_tpg);
 522         return tl_tpg->tl_fabric_prot_type;
 523 }
 524
 525 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 526 {
 527         return 1;
 528 }
 529
 530 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 531 {
 532         return 1;
 533 }
 534
 535 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 536 {
 537         return;
 538 }
 539
 540 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 541 {
 542         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 543                         struct tcm_loop_cmd, tl_se_cmd);
 544
 545         return tl_cmd->sc_cmd_state;
 546 }
 547
 548 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 549 {
 550         /*
 551          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 552          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 553          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 554          * format with transport_generic_map_mem_to_cmd().
 555          *
 556          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 557          * object execution queue.
 558          */
 559         target_execute_cmd(se_cmd);
 560         return 0;
 561 }
 562
 563 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 564 {
 565         return 0;
 566 }
 567
 568 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 569 {
 570         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 571                                 struct tcm_loop_cmd, tl_se_cmd);
 572         struct scsi_cmnd *sc = tl_cmd->sc;
 573
 574         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 575                  __func__, sc, sc->cmnd[0]);
 576
 577         sc->result = SAM_STAT_GOOD;
 578         set_host_byte(sc, DID_OK);
 579         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 580             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 581                 scsi_set_resid(sc, se_cmd->residual_count);
 582         sc->scsi_done(sc);
 583         return 0;
 584 }
 585
 586 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 587 {
 588         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 589                                 struct tcm_loop_cmd, tl_se_cmd);
 590         struct scsi_cmnd *sc = tl_cmd->sc;
 591
 592         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 593                  __func__, sc, sc->cmnd[0]);
 594
 595         if (se_cmd->sense_buffer &&
 596            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 597             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 598
 599                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 600                                 SCSI_SENSE_BUFFERSIZE);
 601                 sc->result = SAM_STAT_CHECK_CONDITION;
 602                 set_driver_byte(sc, DRIVER_SENSE);
 603         } else
 604                 sc->result = se_cmd->scsi_status;
 605
 606         set_host_byte(sc, DID_OK);
 607         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 608             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 609                 scsi_set_resid(sc, se_cmd->residual_count);
 610         sc->scsi_done(sc);
 611         return 0;
 612 }
 613
 614 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 615 {
 616         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 617                                 struct tcm_loop_cmd, tl_se_cmd);
 618
 619         /* Wake up tcm_loop_issue_tmr(). */
 620         complete(&tl_cmd->tmr_done);
 621 }
 622
 623 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 624 {
 625         return;
 626 }
 627
 628 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 629 {
 630         switch (tl_hba->tl_proto_id) {
 631         case SCSI_PROTOCOL_SAS:
 632                 return "SAS";
 633         case SCSI_PROTOCOL_FCP:
 634                 return "FCP";
 635         case SCSI_PROTOCOL_ISCSI:
 636                 return "iSCSI";
 637         default:
 638                 break;
 639         }
 640
 641         return "Unknown";
 642 }
 643
 644 /* Start items for tcm_loop_port_cit */
 645
 646 static int tcm_loop_port_link(
 647         struct se_portal_group *se_tpg,
 648         struct se_lun *lun)
 649 {
 650         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 651                                 struct tcm_loop_tpg, tl_se_tpg);
 652         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 653
 654         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 655         /*
 656          * Add Linux/SCSI struct scsi_device by HCTL
 657          */
 658         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 659
 660         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 661         return 0;
 662 }
 663
 664 static void tcm_loop_port_unlink(
 665         struct se_portal_group *se_tpg,
 666         struct se_lun *se_lun)
 667 {
 668         struct scsi_device *sd;
 669         struct tcm_loop_hba *tl_hba;
 670         struct tcm_loop_tpg *tl_tpg;
 671
 672         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 673         tl_hba = tl_tpg->tl_hba;
 674
 675         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 676                                 se_lun->unpacked_lun);
 677         if (!sd) {
 678                 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
 679                        0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 680                 return;
 681         }
 682         /*
 683          * Remove Linux/SCSI struct scsi_device by HCTL
 684          */
 685         scsi_remove_device(sd);
 686         scsi_device_put(sd);
 687
 688         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 689
 690         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 691 }
 692
 693 /* End items for tcm_loop_port_cit */
 694
 695 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 696                 struct config_item *item, char *page)
 697 {
 698         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 699         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 700                                                    tl_se_tpg);
 701
 702         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 703 }
 704
 705 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 706                 struct config_item *item, const char *page, size_t count)
 707 {
 708         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 709         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 710                                                    tl_se_tpg);
 711         unsigned long val;
 712         int ret = kstrtoul(page, 0, &val);
 713
 714         if (ret) {
 715                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 716                 return ret;
 717         }
 718         if (val != 0 && val != 1 && val != 3) {
 719                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 720                 return -EINVAL;
 721         }
 722         tl_tpg->tl_fabric_prot_type = val;
 723
 724         return count;
 725 }
 726
 727 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 728
 729 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 730         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 731         NULL,
 732 };
 733
 734 /* Start items for tcm_loop_nexus_cit */
 735
 736 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
 737                                   struct se_session *se_sess, void *p)
 738 {
 739         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 740                                         struct tcm_loop_tpg, tl_se_tpg);
 741
 742         tl_tpg->tl_nexus = p;
 743         return 0;
 744 }
 745
 746 static int tcm_loop_make_nexus(
 747         struct tcm_loop_tpg *tl_tpg,
 748         const char *name)
 749 {
 750         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 751         struct tcm_loop_nexus *tl_nexus;
 752         int ret;
 753
 754         if (tl_tpg->tl_nexus) {
 755                 pr_debug("tl_tpg->tl_nexus already exists\n");
 756                 return -EEXIST;
 757         }
 758
 759         tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
 760         if (!tl_nexus)
 761                 return -ENOMEM;
 762
 763         tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
 764                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
 765                                         name, tl_nexus, tcm_loop_alloc_sess_cb);
 766         if (IS_ERR(tl_nexus->se_sess)) {
 767                 ret = PTR_ERR(tl_nexus->se_sess);
 768                 kfree(tl_nexus);
 769                 return ret;
 770         }
 771
 772         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
 773                  tcm_loop_dump_proto_id(tl_hba), name);
 774         return 0;
 775 }
 776
 777 static int tcm_loop_drop_nexus(
 778         struct tcm_loop_tpg *tpg)
 779 {
 780         struct se_session *se_sess;
 781         struct tcm_loop_nexus *tl_nexus;
 782
 783         tl_nexus = tpg->tl_nexus;
 784         if (!tl_nexus)
 785                 return -ENODEV;
 786
 787         se_sess = tl_nexus->se_sess;
 788         if (!se_sess)
 789                 return -ENODEV;
 790
 791         if (atomic_read(&tpg->tl_tpg_port_count)) {
 792                 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
 793                        atomic_read(&tpg->tl_tpg_port_count));
 794                 return -EPERM;
 795         }
 796
 797         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
 798                  tcm_loop_dump_proto_id(tpg->tl_hba),
 799                  tl_nexus->se_sess->se_node_acl->initiatorname);
 800         /*
 801          * Release the SCSI I_T Nexus to the emulated Target Port
 802          */
 803         target_remove_session(se_sess);
 804         tpg->tl_nexus = NULL;
 805         kfree(tl_nexus);
 806         return 0;
 807 }
 808
 809 /* End items for tcm_loop_nexus_cit */
 810
 811 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 812 {
 813         struct se_portal_group *se_tpg = to_tpg(item);
 814         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 815                         struct tcm_loop_tpg, tl_se_tpg);
 816         struct tcm_loop_nexus *tl_nexus;
 817         ssize_t ret;
 818
 819         tl_nexus = tl_tpg->tl_nexus;
 820         if (!tl_nexus)
 821                 return -ENODEV;
 822
 823         ret = snprintf(page, PAGE_SIZE, "%s\n",
 824                 tl_nexus->se_sess->se_node_acl->initiatorname);
 825
 826         return ret;
 827 }
 828
 829 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 830                 const char *page, size_t count)
 831 {
 832         struct se_portal_group *se_tpg = to_tpg(item);
 833         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 834                         struct tcm_loop_tpg, tl_se_tpg);
 835         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 836         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 837         int ret;
 838         /*
 839          * Shutdown the active I_T nexus if 'NULL' is passed..
 840          */
 841         if (!strncmp(page, "NULL", 4)) {
 842                 ret = tcm_loop_drop_nexus(tl_tpg);
 843                 return (!ret) ? count : ret;
 844         }
 845         /*
 846          * Otherwise make sure the passed virtual Initiator port WWN matches
 847          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 848          * tcm_loop_make_nexus()
 849          */
 850         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 851                 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
 852                        page, TL_WWN_ADDR_LEN);
 853                 return -EINVAL;
 854         }
 855         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 856
 857         ptr = strstr(i_port, "naa.");
 858         if (ptr) {
 859                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 860                         pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
 861                                i_port, tcm_loop_dump_proto_id(tl_hba));
 862                         return -EINVAL;
 863                 }
 864                 port_ptr = &i_port[0];
 865                 goto check_newline;
 866         }
 867         ptr = strstr(i_port, "fc.");
 868         if (ptr) {
 869                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 870                         pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
 871                                i_port, tcm_loop_dump_proto_id(tl_hba));
 872                         return -EINVAL;
 873                 }
 874                 port_ptr = &i_port[3]; /* Skip over "fc." */
 875                 goto check_newline;
 876         }
 877         ptr = strstr(i_port, "iqn.");
 878         if (ptr) {
 879                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 880                         pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
 881                                i_port, tcm_loop_dump_proto_id(tl_hba));
 882                         return -EINVAL;
 883                 }
 884                 port_ptr = &i_port[0];
 885                 goto check_newline;
 886         }
 887         pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
 888                i_port);
 889         return -EINVAL;
 890         /*
 891          * Clear any trailing newline for the NAA WWN
 892          */
 893 check_newline:
 894         if (i_port[strlen(i_port)-1] == '\n')
 895                 i_port[strlen(i_port)-1] = '\0';
 896
 897         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 898         if (ret < 0)
 899                 return ret;
 900
 901         return count;
 902 }
 903
 904 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 905                 char *page)
 906 {
 907         struct se_portal_group *se_tpg = to_tpg(item);
 908         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 909                         struct tcm_loop_tpg, tl_se_tpg);
 910         const char *status = NULL;
 911         ssize_t ret = -EINVAL;
 912
 913         switch (tl_tpg->tl_transport_status) {
 914         case TCM_TRANSPORT_ONLINE:
 915                 status = "online";
 916                 break;
 917         case TCM_TRANSPORT_OFFLINE:
 918                 status = "offline";
 919                 break;
 920         default:
 921                 break;
 922         }
 923
 924         if (status)
 925                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 926
 927         return ret;
 928 }
 929
 930 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
 931                 const char *page, size_t count)
 932 {
 933         struct se_portal_group *se_tpg = to_tpg(item);
 934         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 935                         struct tcm_loop_tpg, tl_se_tpg);
 936
 937         if (!strncmp(page, "online", 6)) {
 938                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 939                 return count;
 940         }
 941         if (!strncmp(page, "offline", 7)) {
 942                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
 943                 if (tl_tpg->tl_nexus) {
 944                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 945
 946                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
 947                 }
 948                 return count;
 949         }
 950         return -EINVAL;
 951 }
 952
 953 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
 954                                          char *page)
 955 {
 956         struct se_portal_group *se_tpg = to_tpg(item);
 957         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 958                         struct tcm_loop_tpg, tl_se_tpg);
 959         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 960
 961         return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
 962                         tl_hba->sh->host_no, tl_tpg->tl_tpgt);
 963 }
 964
 965 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
 966 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
 967 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 968
 969 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
 970         &tcm_loop_tpg_attr_nexus,
 971         &tcm_loop_tpg_attr_transport_status,
 972         &tcm_loop_tpg_attr_address,
 973         NULL,
 974 };
 975
 976 /* Start items for tcm_loop_naa_cit */
 977
 978 static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
 979                                                      const char *name)
 980 {
 981         struct tcm_loop_hba *tl_hba = container_of(wwn,
 982                         struct tcm_loop_hba, tl_hba_wwn);
 983         struct tcm_loop_tpg *tl_tpg;
 984         int ret;
 985         unsigned long tpgt;
 986
 987         if (strstr(name, "tpgt_") != name) {
 988                 pr_err("Unable to locate \"tpgt_#\" directory group\n");
 989                 return ERR_PTR(-EINVAL);
 990         }
 991         if (kstrtoul(name+5, 10, &tpgt))
 992                 return ERR_PTR(-EINVAL);
 993
 994         if (tpgt >= TL_TPGS_PER_HBA) {
 995                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
 996                        tpgt, TL_TPGS_PER_HBA);
 997                 return ERR_PTR(-EINVAL);
 998         }
 999         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1000         tl_tpg->tl_hba = tl_hba;
1001         tl_tpg->tl_tpgt = tpgt;
1002         /*
1003          * Register the tl_tpg as a emulated TCM Target Endpoint
1004          */
1005         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1006         if (ret < 0)
1007                 return ERR_PTR(-ENOMEM);
1008
1009         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
1010                  tcm_loop_dump_proto_id(tl_hba),
1011                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1012         return &tl_tpg->tl_se_tpg;
1013 }
1014
1015 static void tcm_loop_drop_naa_tpg(
1016         struct se_portal_group *se_tpg)
1017 {
1018         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1019         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1020                                 struct tcm_loop_tpg, tl_se_tpg);
1021         struct tcm_loop_hba *tl_hba;
1022         unsigned short tpgt;
1023
1024         tl_hba = tl_tpg->tl_hba;
1025         tpgt = tl_tpg->tl_tpgt;
1026         /*
1027          * Release the I_T Nexus for the Virtual target link if present
1028          */
1029         tcm_loop_drop_nexus(tl_tpg);
1030         /*
1031          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1032          */
1033         core_tpg_deregister(se_tpg);
1034
1035         tl_tpg->tl_hba = NULL;
1036         tl_tpg->tl_tpgt = 0;
1037
1038         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1039                  tcm_loop_dump_proto_id(tl_hba),
1040                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1041 }
1042
1043 /* End items for tcm_loop_naa_cit */
1044
1045 /* Start items for tcm_loop_cit */
1046
1047 static struct se_wwn *tcm_loop_make_scsi_hba(
1048         struct target_fabric_configfs *tf,
1049         struct config_group *group,
1050         const char *name)
1051 {
1052         struct tcm_loop_hba *tl_hba;
1053         struct Scsi_Host *sh;
1054         char *ptr;
1055         int ret, off = 0;
1056
1057         tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1058         if (!tl_hba)
1059                 return ERR_PTR(-ENOMEM);
1060
1061         /*
1062          * Determine the emulated Protocol Identifier and Target Port Name
1063          * based on the incoming configfs directory name.
1064          */
1065         ptr = strstr(name, "naa.");
1066         if (ptr) {
1067                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1068                 goto check_len;
1069         }
1070         ptr = strstr(name, "fc.");
1071         if (ptr) {
1072                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1073                 off = 3; /* Skip over "fc." */
1074                 goto check_len;
1075         }
1076         ptr = strstr(name, "iqn.");
1077         if (!ptr) {
1078                 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1079                        name);
1080                 ret = -EINVAL;
1081                 goto out;
1082         }
1083         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1084
1085 check_len:
1086         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1087                 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1088                        name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1089                 ret = -EINVAL;
1090                 goto out;
1091         }
1092         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1093
1094         /*
1095          * Call device_register(tl_hba->dev) to register the emulated
1096          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1097          * device_register() callbacks in tcm_loop_driver_probe()
1098          */
1099         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1100         if (ret)
1101                 goto out;
1102
1103         sh = tl_hba->sh;
1104         tcm_loop_hba_no_cnt++;
1105         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1106                  tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1107         return &tl_hba->tl_hba_wwn;
1108 out:
1109         kfree(tl_hba);
1110         return ERR_PTR(ret);
1111 }
1112
1113 static void tcm_loop_drop_scsi_hba(
1114         struct se_wwn *wwn)
1115 {
1116         struct tcm_loop_hba *tl_hba = container_of(wwn,
1117                                 struct tcm_loop_hba, tl_hba_wwn);
1118
1119         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1120                  tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1121                  tl_hba->sh->host_no);
1122         /*
1123          * Call device_unregister() on the original tl_hba->dev.
1124          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1125          * release *tl_hba;
1126          */
1127         device_unregister(&tl_hba->dev);
1128 }
1129
1130 /* Start items for tcm_loop_cit */
1131 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1132 {
1133         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1134 }
1135
1136 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1137
1138 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1139         &tcm_loop_wwn_attr_version,
1140         NULL,
1141 };
1142
1143 /* End items for tcm_loop_cit */
1144
1145 static const struct target_core_fabric_ops loop_ops = {
1146         .module                         = THIS_MODULE,
1147         .name                           = "loopback",
1148         .fabric_name                    = "loopback",
1149         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1150         .tpg_get_tag                    = tcm_loop_get_tag,
1151         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1152         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1153         .tpg_check_demo_mode_write_protect =
1154                                 tcm_loop_check_demo_mode_write_protect,
1155         .tpg_check_prod_mode_write_protect =
1156                                 tcm_loop_check_prod_mode_write_protect,
1157         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1158         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1159         .check_stop_free                = tcm_loop_check_stop_free,
1160         .release_cmd                    = tcm_loop_release_cmd,
1161         .sess_get_index                 = tcm_loop_sess_get_index,
1162         .write_pending                  = tcm_loop_write_pending,
1163         .write_pending_status           = tcm_loop_write_pending_status,
1164         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1165         .get_cmd_state                  = tcm_loop_get_cmd_state,
1166         .queue_data_in                  = tcm_loop_queue_data_in,
1167         .queue_status                   = tcm_loop_queue_status,
1168         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1169         .aborted_task                   = tcm_loop_aborted_task,
1170         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1171         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1172         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1173         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1174         .fabric_post_link               = tcm_loop_port_link,
1175         .fabric_pre_unlink              = tcm_loop_port_unlink,
1176         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1177         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1178         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1179 };
1180
1181 static int __init tcm_loop_fabric_init(void)
1182 {
1183         int ret = -ENOMEM;
1184
1185         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1186         if (!tcm_loop_workqueue)
1187                 goto out;
1188
1189         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1190                                 sizeof(struct tcm_loop_cmd),
1191                                 __alignof__(struct tcm_loop_cmd),
1192                                 0, NULL);
1193         if (!tcm_loop_cmd_cache) {
1194                 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1195                 goto out_destroy_workqueue;
1196         }
1197
1198         ret = tcm_loop_alloc_core_bus();
1199         if (ret)
1200                 goto out_destroy_cache;
1201
1202         ret = target_register_template(&loop_ops);
1203         if (ret)
1204                 goto out_release_core_bus;
1205
1206         return 0;
1207
1208 out_release_core_bus:
1209         tcm_loop_release_core_bus();
1210 out_destroy_cache:
1211         kmem_cache_destroy(tcm_loop_cmd_cache);
1212 out_destroy_workqueue:
1213         destroy_workqueue(tcm_loop_workqueue);
1214 out:
1215         return ret;
1216 }
1217
1218 static void __exit tcm_loop_fabric_exit(void)
1219 {
1220         target_unregister_template(&loop_ops);
1221         tcm_loop_release_core_bus();
1222         kmem_cache_destroy(tcm_loop_cmd_cache);
1223         destroy_workqueue(tcm_loop_workqueue);
1224 }
1225
1226 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1227 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1228 MODULE_LICENSE("GPL");
1229 module_init(tcm_loop_fabric_init);
1230 module_exit(tcm_loop_fabric_exit);