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 static unsigned int tcm_loop_nr_hw_queues = 1;
  50 module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
  51
  52 static unsigned int tcm_loop_can_queue = 1024;
  53 module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
  54
  55 static unsigned int tcm_loop_cmd_per_lun = 1024;
  56 module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
  57
  58 /*
  59  * Called from struct target_core_fabric_ops->check_stop_free()
  60  */
  61 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
  62 {
  63         return transport_generic_free_cmd(se_cmd, 0);
  64 }
  65
  66 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
  67 {
  68         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
  69                                 struct tcm_loop_cmd, tl_se_cmd);
  70
  71         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
  72 }
  73
  74 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
  75 {
  76         seq_puts(m, "tcm_loop_proc_info()\n");
  77         return 0;
  78 }
  79
  80 static int tcm_loop_driver_probe(struct device *);
  81 static int tcm_loop_driver_remove(struct device *);
  82
  83 static int pseudo_lld_bus_match(struct device *dev,
  84                                 struct device_driver *dev_driver)
  85 {
  86         return 1;
  87 }
  88
  89 static struct bus_type tcm_loop_lld_bus = {
  90         .name                   = "tcm_loop_bus",
  91         .match                  = pseudo_lld_bus_match,
  92         .probe                  = tcm_loop_driver_probe,
  93         .remove                 = tcm_loop_driver_remove,
  94 };
  95
  96 static struct device_driver tcm_loop_driverfs = {
  97         .name                   = "tcm_loop",
  98         .bus                    = &tcm_loop_lld_bus,
  99 };
 100 /*
 101  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
 102  */
 103 static struct device *tcm_loop_primary;
 104
 105 static void tcm_loop_submission_work(struct work_struct *work)
 106 {
 107         struct tcm_loop_cmd *tl_cmd =
 108                 container_of(work, struct tcm_loop_cmd, work);
 109         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
 110         struct scsi_cmnd *sc = tl_cmd->sc;
 111         struct tcm_loop_nexus *tl_nexus;
 112         struct tcm_loop_hba *tl_hba;
 113         struct tcm_loop_tpg *tl_tpg;
 114         struct scatterlist *sgl_bidi = NULL;
 115         u32 sgl_bidi_count = 0, transfer_length;
 116         int rc;
 117
 118         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 119         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 120
 121         /*
 122          * Ensure that this tl_tpg reference from the incoming sc->device->id
 123          * has already been configured via tcm_loop_make_naa_tpg().
 124          */
 125         if (!tl_tpg->tl_hba) {
 126                 set_host_byte(sc, DID_NO_CONNECT);
 127                 goto out_done;
 128         }
 129         if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
 130                 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 131                 goto out_done;
 132         }
 133         tl_nexus = tl_tpg->tl_nexus;
 134         if (!tl_nexus) {
 135                 scmd_printk(KERN_ERR, sc,
 136                             "TCM_Loop I_T Nexus does not exist\n");
 137                 set_host_byte(sc, DID_ERROR);
 138                 goto out_done;
 139         }
 140
 141         transfer_length = scsi_transfer_length(sc);
 142         if (!scsi_prot_sg_count(sc) &&
 143             scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
 144                 se_cmd->prot_pto = true;
 145                 /*
 146                  * loopback transport doesn't support
 147                  * WRITE_GENERATE, READ_STRIP protection
 148                  * information operations, go ahead unprotected.
 149                  */
 150                 transfer_length = scsi_bufflen(sc);
 151         }
 152
 153         se_cmd->tag = tl_cmd->sc_cmd_tag;
 154         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
 155                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
 156                         transfer_length, TCM_SIMPLE_TAG,
 157                         sc->sc_data_direction, 0,
 158                         scsi_sglist(sc), scsi_sg_count(sc),
 159                         sgl_bidi, sgl_bidi_count,
 160                         scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
 161         if (rc < 0) {
 162                 set_host_byte(sc, DID_NO_CONNECT);
 163                 goto out_done;
 164         }
 165         return;
 166
 167 out_done:
 168         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 169         sc->scsi_done(sc);
 170 }
 171
 172 /*
 173  * ->queuecommand can be and usually is called from interrupt context, so
 174  * defer the actual submission to a workqueue.
 175  */
 176 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
 177 {
 178         struct tcm_loop_cmd *tl_cmd;
 179
 180         pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
 181                  __func__, sc->device->host->host_no, sc->device->id,
 182                  sc->device->channel, sc->device->lun, sc->cmnd[0],
 183                  scsi_bufflen(sc));
 184
 185         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
 186         if (!tl_cmd) {
 187                 set_host_byte(sc, DID_ERROR);
 188                 sc->scsi_done(sc);
 189                 return 0;
 190         }
 191
 192         tl_cmd->sc = sc;
 193         tl_cmd->sc_cmd_tag = sc->request->tag;
 194         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
 195         queue_work(tcm_loop_workqueue, &tl_cmd->work);
 196         return 0;
 197 }
 198
 199 /*
 200  * Called from SCSI EH process context to issue a LUN_RESET TMR
 201  * to struct scsi_device
 202  */
 203 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 204                               u64 lun, int task, enum tcm_tmreq_table tmr)
 205 {
 206         struct se_cmd *se_cmd;
 207         struct se_session *se_sess;
 208         struct tcm_loop_nexus *tl_nexus;
 209         struct tcm_loop_cmd *tl_cmd;
 210         int ret = TMR_FUNCTION_FAILED, rc;
 211
 212         /*
 213          * Locate the tl_nexus and se_sess pointers
 214          */
 215         tl_nexus = tl_tpg->tl_nexus;
 216         if (!tl_nexus) {
 217                 pr_err("Unable to perform device reset without active I_T Nexus\n");
 218                 return ret;
 219         }
 220
 221         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 222         if (!tl_cmd)
 223                 return ret;
 224
 225         init_completion(&tl_cmd->tmr_done);
 226
 227         se_cmd = &tl_cmd->tl_se_cmd;
 228         se_sess = tl_tpg->tl_nexus->se_sess;
 229
 230         rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
 231                                NULL, tmr, GFP_KERNEL, task,
 232                                TARGET_SCF_ACK_KREF);
 233         if (rc < 0)
 234                 goto release;
 235         wait_for_completion(&tl_cmd->tmr_done);
 236         ret = se_cmd->se_tmr_req->response;
 237         target_put_sess_cmd(se_cmd);
 238
 239 out:
 240         return ret;
 241
 242 release:
 243         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 244         goto out;
 245 }
 246
 247 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 248 {
 249         struct tcm_loop_hba *tl_hba;
 250         struct tcm_loop_tpg *tl_tpg;
 251         int ret = FAILED;
 252
 253         /*
 254          * Locate the tcm_loop_hba_t pointer
 255          */
 256         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 257         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 258         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 259                                  sc->request->tag, TMR_ABORT_TASK);
 260         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 261 }
 262
 263 /*
 264  * Called from SCSI EH process context to issue a LUN_RESET TMR
 265  * to struct scsi_device
 266  */
 267 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 268 {
 269         struct tcm_loop_hba *tl_hba;
 270         struct tcm_loop_tpg *tl_tpg;
 271         int ret = FAILED;
 272
 273         /*
 274          * Locate the tcm_loop_hba_t pointer
 275          */
 276         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 277         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 278
 279         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 280                                  0, TMR_LUN_RESET);
 281         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 282 }
 283
 284 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 285 {
 286         struct tcm_loop_hba *tl_hba;
 287         struct tcm_loop_tpg *tl_tpg;
 288
 289         /*
 290          * Locate the tcm_loop_hba_t pointer
 291          */
 292         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 293         if (!tl_hba) {
 294                 pr_err("Unable to perform device reset without active I_T Nexus\n");
 295                 return FAILED;
 296         }
 297         /*
 298          * Locate the tl_tpg pointer from TargetID in sc->device->id
 299          */
 300         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 301         if (tl_tpg) {
 302                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 303                 return SUCCESS;
 304         }
 305         return FAILED;
 306 }
 307
 308 static struct scsi_host_template tcm_loop_driver_template = {
 309         .show_info              = tcm_loop_show_info,
 310         .proc_name              = "tcm_loopback",
 311         .name                   = "TCM_Loopback",
 312         .queuecommand           = tcm_loop_queuecommand,
 313         .change_queue_depth     = scsi_change_queue_depth,
 314         .eh_abort_handler = tcm_loop_abort_task,
 315         .eh_device_reset_handler = tcm_loop_device_reset,
 316         .eh_target_reset_handler = tcm_loop_target_reset,
 317         .this_id                = -1,
 318         .sg_tablesize           = 256,
 319         .max_sectors            = 0xFFFF,
 320         .dma_boundary           = PAGE_SIZE - 1,
 321         .module                 = THIS_MODULE,
 322         .track_queue_depth      = 1,
 323 };
 324
 325 static int tcm_loop_driver_probe(struct device *dev)
 326 {
 327         struct tcm_loop_hba *tl_hba;
 328         struct Scsi_Host *sh;
 329         int error, host_prot;
 330
 331         tl_hba = to_tcm_loop_hba(dev);
 332
 333         sh = scsi_host_alloc(&tcm_loop_driver_template,
 334                         sizeof(struct tcm_loop_hba));
 335         if (!sh) {
 336                 pr_err("Unable to allocate struct scsi_host\n");
 337                 return -ENODEV;
 338         }
 339         tl_hba->sh = sh;
 340
 341         /*
 342          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 343          */
 344         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 345         /*
 346          * Setup single ID, Channel and LUN for now..
 347          */
 348         sh->max_id = 2;
 349         sh->max_lun = 0;
 350         sh->max_channel = 0;
 351         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 352         sh->nr_hw_queues = tcm_loop_nr_hw_queues;
 353         sh->can_queue = tcm_loop_can_queue;
 354         sh->cmd_per_lun = tcm_loop_cmd_per_lun;
 355
 356         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 357                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 358                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 359
 360         scsi_host_set_prot(sh, host_prot);
 361         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 362
 363         error = scsi_add_host(sh, &tl_hba->dev);
 364         if (error) {
 365                 pr_err("%s: scsi_add_host failed\n", __func__);
 366                 scsi_host_put(sh);
 367                 return -ENODEV;
 368         }
 369         return 0;
 370 }
 371
 372 static int tcm_loop_driver_remove(struct device *dev)
 373 {
 374         struct tcm_loop_hba *tl_hba;
 375         struct Scsi_Host *sh;
 376
 377         tl_hba = to_tcm_loop_hba(dev);
 378         sh = tl_hba->sh;
 379
 380         scsi_remove_host(sh);
 381         scsi_host_put(sh);
 382         return 0;
 383 }
 384
 385 static void tcm_loop_release_adapter(struct device *dev)
 386 {
 387         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 388
 389         kfree(tl_hba);
 390 }
 391
 392 /*
 393  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 394  */
 395 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 396 {
 397         int ret;
 398
 399         tl_hba->dev.bus = &tcm_loop_lld_bus;
 400         tl_hba->dev.parent = tcm_loop_primary;
 401         tl_hba->dev.release = &tcm_loop_release_adapter;
 402         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 403
 404         ret = device_register(&tl_hba->dev);
 405         if (ret) {
 406                 pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
 407                 return -ENODEV;
 408         }
 409
 410         return 0;
 411 }
 412
 413 /*
 414  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 415  * tcm_loop SCSI bus.
 416  */
 417 static int tcm_loop_alloc_core_bus(void)
 418 {
 419         int ret;
 420
 421         tcm_loop_primary = root_device_register("tcm_loop_0");
 422         if (IS_ERR(tcm_loop_primary)) {
 423                 pr_err("Unable to allocate tcm_loop_primary\n");
 424                 return PTR_ERR(tcm_loop_primary);
 425         }
 426
 427         ret = bus_register(&tcm_loop_lld_bus);
 428         if (ret) {
 429                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 430                 goto dev_unreg;
 431         }
 432
 433         ret = driver_register(&tcm_loop_driverfs);
 434         if (ret) {
 435                 pr_err("driver_register() failed for tcm_loop_driverfs\n");
 436                 goto bus_unreg;
 437         }
 438
 439         pr_debug("Initialized TCM Loop Core Bus\n");
 440         return ret;
 441
 442 bus_unreg:
 443         bus_unregister(&tcm_loop_lld_bus);
 444 dev_unreg:
 445         root_device_unregister(tcm_loop_primary);
 446         return ret;
 447 }
 448
 449 static void tcm_loop_release_core_bus(void)
 450 {
 451         driver_unregister(&tcm_loop_driverfs);
 452         bus_unregister(&tcm_loop_lld_bus);
 453         root_device_unregister(tcm_loop_primary);
 454
 455         pr_debug("Releasing TCM Loop Core BUS\n");
 456 }
 457
 458 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 459 {
 460         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 461 }
 462
 463 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 464 {
 465         /*
 466          * Return the passed NAA identifier for the Target Port
 467          */
 468         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 469 }
 470
 471 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 472 {
 473         /*
 474          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 475          * to represent the SCSI Target Port.
 476          */
 477         return tl_tpg(se_tpg)->tl_tpgt;
 478 }
 479
 480 /*
 481  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 482  * based upon the incoming fabric dependent SCSI Initiator Port
 483  */
 484 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 485 {
 486         return 1;
 487 }
 488
 489 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 490 {
 491         return 0;
 492 }
 493
 494 /*
 495  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 496  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 497  */
 498 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 499 {
 500         return 0;
 501 }
 502
 503 /*
 504  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 505  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 506  * It has been added here as a nop for target_fabric_tf_ops_check()
 507  */
 508 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 509 {
 510         return 0;
 511 }
 512
 513 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 514 {
 515         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 516                                                    tl_se_tpg);
 517         return tl_tpg->tl_fabric_prot_type;
 518 }
 519
 520 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 521 {
 522         return 1;
 523 }
 524
 525 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 526 {
 527         return 1;
 528 }
 529
 530 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 531 {
 532         return;
 533 }
 534
 535 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 536 {
 537         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 538                         struct tcm_loop_cmd, tl_se_cmd);
 539
 540         return tl_cmd->sc_cmd_state;
 541 }
 542
 543 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 544 {
 545         /*
 546          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 547          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 548          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 549          * format with transport_generic_map_mem_to_cmd().
 550          *
 551          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 552          * object execution queue.
 553          */
 554         target_execute_cmd(se_cmd);
 555         return 0;
 556 }
 557
 558 static int tcm_loop_queue_data_or_status(const char *func,
 559                 struct se_cmd *se_cmd, u8 scsi_status)
 560 {
 561         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 562                                 struct tcm_loop_cmd, tl_se_cmd);
 563         struct scsi_cmnd *sc = tl_cmd->sc;
 564
 565         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 566                  func, sc, sc->cmnd[0]);
 567
 568         if (se_cmd->sense_buffer &&
 569            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 570             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 571
 572                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 573                                 SCSI_SENSE_BUFFERSIZE);
 574                 sc->result = SAM_STAT_CHECK_CONDITION;
 575                 set_driver_byte(sc, DRIVER_SENSE);
 576         } else
 577                 sc->result = scsi_status;
 578
 579         set_host_byte(sc, DID_OK);
 580         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 581             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 582                 scsi_set_resid(sc, se_cmd->residual_count);
 583         sc->scsi_done(sc);
 584         return 0;
 585 }
 586
 587 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 588 {
 589         return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
 590 }
 591
 592 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 593 {
 594         return tcm_loop_queue_data_or_status(__func__,
 595                                              se_cmd, se_cmd->scsi_status);
 596 }
 597
 598 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 599 {
 600         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 601                                 struct tcm_loop_cmd, tl_se_cmd);
 602
 603         /* Wake up tcm_loop_issue_tmr(). */
 604         complete(&tl_cmd->tmr_done);
 605 }
 606
 607 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 608 {
 609         return;
 610 }
 611
 612 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 613 {
 614         switch (tl_hba->tl_proto_id) {
 615         case SCSI_PROTOCOL_SAS:
 616                 return "SAS";
 617         case SCSI_PROTOCOL_FCP:
 618                 return "FCP";
 619         case SCSI_PROTOCOL_ISCSI:
 620                 return "iSCSI";
 621         default:
 622                 break;
 623         }
 624
 625         return "Unknown";
 626 }
 627
 628 /* Start items for tcm_loop_port_cit */
 629
 630 static int tcm_loop_port_link(
 631         struct se_portal_group *se_tpg,
 632         struct se_lun *lun)
 633 {
 634         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 635                                 struct tcm_loop_tpg, tl_se_tpg);
 636         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 637
 638         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 639         /*
 640          * Add Linux/SCSI struct scsi_device by HCTL
 641          */
 642         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 643
 644         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 645         return 0;
 646 }
 647
 648 static void tcm_loop_port_unlink(
 649         struct se_portal_group *se_tpg,
 650         struct se_lun *se_lun)
 651 {
 652         struct scsi_device *sd;
 653         struct tcm_loop_hba *tl_hba;
 654         struct tcm_loop_tpg *tl_tpg;
 655
 656         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 657         tl_hba = tl_tpg->tl_hba;
 658
 659         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 660                                 se_lun->unpacked_lun);
 661         if (!sd) {
 662                 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
 663                        0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 664                 return;
 665         }
 666         /*
 667          * Remove Linux/SCSI struct scsi_device by HCTL
 668          */
 669         scsi_remove_device(sd);
 670         scsi_device_put(sd);
 671
 672         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 673
 674         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 675 }
 676
 677 /* End items for tcm_loop_port_cit */
 678
 679 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 680                 struct config_item *item, char *page)
 681 {
 682         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 683         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 684                                                    tl_se_tpg);
 685
 686         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 687 }
 688
 689 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 690                 struct config_item *item, const char *page, size_t count)
 691 {
 692         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 693         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 694                                                    tl_se_tpg);
 695         unsigned long val;
 696         int ret = kstrtoul(page, 0, &val);
 697
 698         if (ret) {
 699                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 700                 return ret;
 701         }
 702         if (val != 0 && val != 1 && val != 3) {
 703                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 704                 return -EINVAL;
 705         }
 706         tl_tpg->tl_fabric_prot_type = val;
 707
 708         return count;
 709 }
 710
 711 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 712
 713 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 714         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 715         NULL,
 716 };
 717
 718 /* Start items for tcm_loop_nexus_cit */
 719
 720 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
 721                                   struct se_session *se_sess, void *p)
 722 {
 723         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 724                                         struct tcm_loop_tpg, tl_se_tpg);
 725
 726         tl_tpg->tl_nexus = p;
 727         return 0;
 728 }
 729
 730 static int tcm_loop_make_nexus(
 731         struct tcm_loop_tpg *tl_tpg,
 732         const char *name)
 733 {
 734         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 735         struct tcm_loop_nexus *tl_nexus;
 736         int ret;
 737
 738         if (tl_tpg->tl_nexus) {
 739                 pr_debug("tl_tpg->tl_nexus already exists\n");
 740                 return -EEXIST;
 741         }
 742
 743         tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
 744         if (!tl_nexus)
 745                 return -ENOMEM;
 746
 747         tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
 748                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
 749                                         name, tl_nexus, tcm_loop_alloc_sess_cb);
 750         if (IS_ERR(tl_nexus->se_sess)) {
 751                 ret = PTR_ERR(tl_nexus->se_sess);
 752                 kfree(tl_nexus);
 753                 return ret;
 754         }
 755
 756         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
 757                  tcm_loop_dump_proto_id(tl_hba), name);
 758         return 0;
 759 }
 760
 761 static int tcm_loop_drop_nexus(
 762         struct tcm_loop_tpg *tpg)
 763 {
 764         struct se_session *se_sess;
 765         struct tcm_loop_nexus *tl_nexus;
 766
 767         tl_nexus = tpg->tl_nexus;
 768         if (!tl_nexus)
 769                 return -ENODEV;
 770
 771         se_sess = tl_nexus->se_sess;
 772         if (!se_sess)
 773                 return -ENODEV;
 774
 775         if (atomic_read(&tpg->tl_tpg_port_count)) {
 776                 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
 777                        atomic_read(&tpg->tl_tpg_port_count));
 778                 return -EPERM;
 779         }
 780
 781         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
 782                  tcm_loop_dump_proto_id(tpg->tl_hba),
 783                  tl_nexus->se_sess->se_node_acl->initiatorname);
 784         /*
 785          * Release the SCSI I_T Nexus to the emulated Target Port
 786          */
 787         target_remove_session(se_sess);
 788         tpg->tl_nexus = NULL;
 789         kfree(tl_nexus);
 790         return 0;
 791 }
 792
 793 /* End items for tcm_loop_nexus_cit */
 794
 795 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 796 {
 797         struct se_portal_group *se_tpg = to_tpg(item);
 798         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 799                         struct tcm_loop_tpg, tl_se_tpg);
 800         struct tcm_loop_nexus *tl_nexus;
 801         ssize_t ret;
 802
 803         tl_nexus = tl_tpg->tl_nexus;
 804         if (!tl_nexus)
 805                 return -ENODEV;
 806
 807         ret = snprintf(page, PAGE_SIZE, "%s\n",
 808                 tl_nexus->se_sess->se_node_acl->initiatorname);
 809
 810         return ret;
 811 }
 812
 813 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 814                 const char *page, size_t count)
 815 {
 816         struct se_portal_group *se_tpg = to_tpg(item);
 817         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 818                         struct tcm_loop_tpg, tl_se_tpg);
 819         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 820         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 821         int ret;
 822         /*
 823          * Shutdown the active I_T nexus if 'NULL' is passed..
 824          */
 825         if (!strncmp(page, "NULL", 4)) {
 826                 ret = tcm_loop_drop_nexus(tl_tpg);
 827                 return (!ret) ? count : ret;
 828         }
 829         /*
 830          * Otherwise make sure the passed virtual Initiator port WWN matches
 831          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 832          * tcm_loop_make_nexus()
 833          */
 834         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 835                 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
 836                        page, TL_WWN_ADDR_LEN);
 837                 return -EINVAL;
 838         }
 839         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 840
 841         ptr = strstr(i_port, "naa.");
 842         if (ptr) {
 843                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 844                         pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
 845                                i_port, tcm_loop_dump_proto_id(tl_hba));
 846                         return -EINVAL;
 847                 }
 848                 port_ptr = &i_port[0];
 849                 goto check_newline;
 850         }
 851         ptr = strstr(i_port, "fc.");
 852         if (ptr) {
 853                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 854                         pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
 855                                i_port, tcm_loop_dump_proto_id(tl_hba));
 856                         return -EINVAL;
 857                 }
 858                 port_ptr = &i_port[3]; /* Skip over "fc." */
 859                 goto check_newline;
 860         }
 861         ptr = strstr(i_port, "iqn.");
 862         if (ptr) {
 863                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 864                         pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
 865                                i_port, tcm_loop_dump_proto_id(tl_hba));
 866                         return -EINVAL;
 867                 }
 868                 port_ptr = &i_port[0];
 869                 goto check_newline;
 870         }
 871         pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
 872                i_port);
 873         return -EINVAL;
 874         /*
 875          * Clear any trailing newline for the NAA WWN
 876          */
 877 check_newline:
 878         if (i_port[strlen(i_port)-1] == '\n')
 879                 i_port[strlen(i_port)-1] = '\0';
 880
 881         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 882         if (ret < 0)
 883                 return ret;
 884
 885         return count;
 886 }
 887
 888 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 889                 char *page)
 890 {
 891         struct se_portal_group *se_tpg = to_tpg(item);
 892         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 893                         struct tcm_loop_tpg, tl_se_tpg);
 894         const char *status = NULL;
 895         ssize_t ret = -EINVAL;
 896
 897         switch (tl_tpg->tl_transport_status) {
 898         case TCM_TRANSPORT_ONLINE:
 899                 status = "online";
 900                 break;
 901         case TCM_TRANSPORT_OFFLINE:
 902                 status = "offline";
 903                 break;
 904         default:
 905                 break;
 906         }
 907
 908         if (status)
 909                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 910
 911         return ret;
 912 }
 913
 914 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
 915                 const char *page, size_t count)
 916 {
 917         struct se_portal_group *se_tpg = to_tpg(item);
 918         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 919                         struct tcm_loop_tpg, tl_se_tpg);
 920
 921         if (!strncmp(page, "online", 6)) {
 922                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 923                 return count;
 924         }
 925         if (!strncmp(page, "offline", 7)) {
 926                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
 927                 if (tl_tpg->tl_nexus) {
 928                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 929
 930                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
 931                 }
 932                 return count;
 933         }
 934         return -EINVAL;
 935 }
 936
 937 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
 938                                          char *page)
 939 {
 940         struct se_portal_group *se_tpg = to_tpg(item);
 941         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 942                         struct tcm_loop_tpg, tl_se_tpg);
 943         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 944
 945         return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
 946                         tl_hba->sh->host_no, tl_tpg->tl_tpgt);
 947 }
 948
 949 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
 950 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
 951 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 952
 953 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
 954         &tcm_loop_tpg_attr_nexus,
 955         &tcm_loop_tpg_attr_transport_status,
 956         &tcm_loop_tpg_attr_address,
 957         NULL,
 958 };
 959
 960 /* Start items for tcm_loop_naa_cit */
 961
 962 static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
 963                                                      const char *name)
 964 {
 965         struct tcm_loop_hba *tl_hba = container_of(wwn,
 966                         struct tcm_loop_hba, tl_hba_wwn);
 967         struct tcm_loop_tpg *tl_tpg;
 968         int ret;
 969         unsigned long tpgt;
 970
 971         if (strstr(name, "tpgt_") != name) {
 972                 pr_err("Unable to locate \"tpgt_#\" directory group\n");
 973                 return ERR_PTR(-EINVAL);
 974         }
 975         if (kstrtoul(name+5, 10, &tpgt))
 976                 return ERR_PTR(-EINVAL);
 977
 978         if (tpgt >= TL_TPGS_PER_HBA) {
 979                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
 980                        tpgt, TL_TPGS_PER_HBA);
 981                 return ERR_PTR(-EINVAL);
 982         }
 983         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
 984         tl_tpg->tl_hba = tl_hba;
 985         tl_tpg->tl_tpgt = tpgt;
 986         /*
 987          * Register the tl_tpg as a emulated TCM Target Endpoint
 988          */
 989         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
 990         if (ret < 0)
 991                 return ERR_PTR(-ENOMEM);
 992
 993         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
 994                  tcm_loop_dump_proto_id(tl_hba),
 995                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
 996         return &tl_tpg->tl_se_tpg;
 997 }
 998
 999 static void tcm_loop_drop_naa_tpg(
1000         struct se_portal_group *se_tpg)
1001 {
1002         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1003         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1004                                 struct tcm_loop_tpg, tl_se_tpg);
1005         struct tcm_loop_hba *tl_hba;
1006         unsigned short tpgt;
1007
1008         tl_hba = tl_tpg->tl_hba;
1009         tpgt = tl_tpg->tl_tpgt;
1010         /*
1011          * Release the I_T Nexus for the Virtual target link if present
1012          */
1013         tcm_loop_drop_nexus(tl_tpg);
1014         /*
1015          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1016          */
1017         core_tpg_deregister(se_tpg);
1018
1019         tl_tpg->tl_hba = NULL;
1020         tl_tpg->tl_tpgt = 0;
1021
1022         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1023                  tcm_loop_dump_proto_id(tl_hba),
1024                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1025 }
1026
1027 /* End items for tcm_loop_naa_cit */
1028
1029 /* Start items for tcm_loop_cit */
1030
1031 static struct se_wwn *tcm_loop_make_scsi_hba(
1032         struct target_fabric_configfs *tf,
1033         struct config_group *group,
1034         const char *name)
1035 {
1036         struct tcm_loop_hba *tl_hba;
1037         struct Scsi_Host *sh;
1038         char *ptr;
1039         int ret, off = 0;
1040
1041         tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1042         if (!tl_hba)
1043                 return ERR_PTR(-ENOMEM);
1044
1045         /*
1046          * Determine the emulated Protocol Identifier and Target Port Name
1047          * based on the incoming configfs directory name.
1048          */
1049         ptr = strstr(name, "naa.");
1050         if (ptr) {
1051                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1052                 goto check_len;
1053         }
1054         ptr = strstr(name, "fc.");
1055         if (ptr) {
1056                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1057                 off = 3; /* Skip over "fc." */
1058                 goto check_len;
1059         }
1060         ptr = strstr(name, "iqn.");
1061         if (!ptr) {
1062                 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1063                        name);
1064                 ret = -EINVAL;
1065                 goto out;
1066         }
1067         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1068
1069 check_len:
1070         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1071                 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1072                        name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1073                 ret = -EINVAL;
1074                 goto out;
1075         }
1076         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1077
1078         /*
1079          * Call device_register(tl_hba->dev) to register the emulated
1080          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1081          * device_register() callbacks in tcm_loop_driver_probe()
1082          */
1083         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1084         if (ret)
1085                 goto out;
1086
1087         sh = tl_hba->sh;
1088         tcm_loop_hba_no_cnt++;
1089         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1090                  tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1091         return &tl_hba->tl_hba_wwn;
1092 out:
1093         kfree(tl_hba);
1094         return ERR_PTR(ret);
1095 }
1096
1097 static void tcm_loop_drop_scsi_hba(
1098         struct se_wwn *wwn)
1099 {
1100         struct tcm_loop_hba *tl_hba = container_of(wwn,
1101                                 struct tcm_loop_hba, tl_hba_wwn);
1102
1103         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1104                  tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1105                  tl_hba->sh->host_no);
1106         /*
1107          * Call device_unregister() on the original tl_hba->dev.
1108          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1109          * release *tl_hba;
1110          */
1111         device_unregister(&tl_hba->dev);
1112 }
1113
1114 /* Start items for tcm_loop_cit */
1115 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1116 {
1117         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1118 }
1119
1120 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1121
1122 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1123         &tcm_loop_wwn_attr_version,
1124         NULL,
1125 };
1126
1127 /* End items for tcm_loop_cit */
1128
1129 static const struct target_core_fabric_ops loop_ops = {
1130         .module                         = THIS_MODULE,
1131         .fabric_name                    = "loopback",
1132         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1133         .tpg_get_tag                    = tcm_loop_get_tag,
1134         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1135         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1136         .tpg_check_demo_mode_write_protect =
1137                                 tcm_loop_check_demo_mode_write_protect,
1138         .tpg_check_prod_mode_write_protect =
1139                                 tcm_loop_check_prod_mode_write_protect,
1140         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1141         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1142         .check_stop_free                = tcm_loop_check_stop_free,
1143         .release_cmd                    = tcm_loop_release_cmd,
1144         .sess_get_index                 = tcm_loop_sess_get_index,
1145         .write_pending                  = tcm_loop_write_pending,
1146         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1147         .get_cmd_state                  = tcm_loop_get_cmd_state,
1148         .queue_data_in                  = tcm_loop_queue_data_in,
1149         .queue_status                   = tcm_loop_queue_status,
1150         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1151         .aborted_task                   = tcm_loop_aborted_task,
1152         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1153         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1154         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1155         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1156         .fabric_post_link               = tcm_loop_port_link,
1157         .fabric_pre_unlink              = tcm_loop_port_unlink,
1158         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1159         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1160         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1161 };
1162
1163 static int __init tcm_loop_fabric_init(void)
1164 {
1165         int ret = -ENOMEM;
1166
1167         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1168         if (!tcm_loop_workqueue)
1169                 goto out;
1170
1171         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1172                                 sizeof(struct tcm_loop_cmd),
1173                                 __alignof__(struct tcm_loop_cmd),
1174                                 0, NULL);
1175         if (!tcm_loop_cmd_cache) {
1176                 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1177                 goto out_destroy_workqueue;
1178         }
1179
1180         ret = tcm_loop_alloc_core_bus();
1181         if (ret)
1182                 goto out_destroy_cache;
1183
1184         ret = target_register_template(&loop_ops);
1185         if (ret)
1186                 goto out_release_core_bus;
1187
1188         return 0;
1189
1190 out_release_core_bus:
1191         tcm_loop_release_core_bus();
1192 out_destroy_cache:
1193         kmem_cache_destroy(tcm_loop_cmd_cache);
1194 out_destroy_workqueue:
1195         destroy_workqueue(tcm_loop_workqueue);
1196 out:
1197         return ret;
1198 }
1199
1200 static void __exit tcm_loop_fabric_exit(void)
1201 {
1202         target_unregister_template(&loop_ops);
1203         tcm_loop_release_core_bus();
1204         kmem_cache_destroy(tcm_loop_cmd_cache);
1205         destroy_workqueue(tcm_loop_workqueue);
1206 }
1207
1208 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1209 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1210 MODULE_LICENSE("GPL");
1211 module_init(tcm_loop_fabric_init);
1212 module_exit(tcm_loop_fabric_exit);