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_printf(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, "TCM_Loop I_T Nexus"
 127                                 " 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         return;
 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("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
 181                 " scsi_buf_len: %u\n", sc->device->host->host_no,
 182                 sc->device->id, sc->device->channel, sc->device->lun,
 183                 sc->cmnd[0], scsi_bufflen(sc));
 184
 185         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
 186         if (!tl_cmd) {
 187                 pr_err("Unable to allocate struct tcm_loop_cmd\n");
 188                 set_host_byte(sc, DID_ERROR);
 189                 sc->scsi_done(sc);
 190                 return 0;
 191         }
 192
 193         tl_cmd->sc = sc;
 194         tl_cmd->sc_cmd_tag = sc->request->tag;
 195         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
 196         queue_work(tcm_loop_workqueue, &tl_cmd->work);
 197         return 0;
 198 }
 199
 200 /*
 201  * Called from SCSI EH process context to issue a LUN_RESET TMR
 202  * to struct scsi_device
 203  */
 204 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 205                               u64 lun, int task, enum tcm_tmreq_table tmr)
 206 {
 207         struct se_cmd *se_cmd = NULL;
 208         struct se_session *se_sess;
 209         struct tcm_loop_nexus *tl_nexus;
 210         struct tcm_loop_cmd *tl_cmd = NULL;
 211         int ret = TMR_FUNCTION_FAILED, rc;
 212
 213         /*
 214          * Locate the tl_nexus and se_sess pointers
 215          */
 216         tl_nexus = tl_tpg->tl_nexus;
 217         if (!tl_nexus) {
 218                 pr_err("Unable to perform device reset without"
 219                                 " active I_T Nexus\n");
 220                 return ret;
 221         }
 222
 223         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 224         if (!tl_cmd) {
 225                 pr_err("Unable to allocate memory for tl_cmd\n");
 226                 return ret;
 227         }
 228
 229         init_completion(&tl_cmd->tmr_done);
 230
 231         se_cmd = &tl_cmd->tl_se_cmd;
 232         se_sess = tl_tpg->tl_nexus->se_sess;
 233
 234         rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
 235                                NULL, tmr, GFP_KERNEL, task,
 236                                TARGET_SCF_ACK_KREF);
 237         if (rc < 0)
 238                 goto release;
 239         wait_for_completion(&tl_cmd->tmr_done);
 240         ret = se_cmd->se_tmr_req->response;
 241         target_put_sess_cmd(se_cmd);
 242
 243 out:
 244         return ret;
 245
 246 release:
 247         if (se_cmd)
 248                 transport_generic_free_cmd(se_cmd, 0);
 249         else
 250                 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 251         goto out;
 252 }
 253
 254 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 255 {
 256         struct tcm_loop_hba *tl_hba;
 257         struct tcm_loop_tpg *tl_tpg;
 258         int ret = FAILED;
 259
 260         /*
 261          * Locate the tcm_loop_hba_t pointer
 262          */
 263         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 264         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 265         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 266                                  sc->request->tag, TMR_ABORT_TASK);
 267         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 268 }
 269
 270 /*
 271  * Called from SCSI EH process context to issue a LUN_RESET TMR
 272  * to struct scsi_device
 273  */
 274 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 275 {
 276         struct tcm_loop_hba *tl_hba;
 277         struct tcm_loop_tpg *tl_tpg;
 278         int ret = FAILED;
 279
 280         /*
 281          * Locate the tcm_loop_hba_t pointer
 282          */
 283         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 284         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 285
 286         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 287                                  0, TMR_LUN_RESET);
 288         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 289 }
 290
 291 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 292 {
 293         struct tcm_loop_hba *tl_hba;
 294         struct tcm_loop_tpg *tl_tpg;
 295
 296         /*
 297          * Locate the tcm_loop_hba_t pointer
 298          */
 299         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 300         if (!tl_hba) {
 301                 pr_err("Unable to perform device reset without"
 302                                 " active I_T Nexus\n");
 303                 return FAILED;
 304         }
 305         /*
 306          * Locate the tl_tpg pointer from TargetID in sc->device->id
 307          */
 308         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 309         if (tl_tpg) {
 310                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 311                 return SUCCESS;
 312         }
 313         return FAILED;
 314 }
 315
 316 static int tcm_loop_slave_alloc(struct scsi_device *sd)
 317 {
 318         set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
 319         return 0;
 320 }
 321
 322 static struct scsi_host_template tcm_loop_driver_template = {
 323         .show_info              = tcm_loop_show_info,
 324         .proc_name              = "tcm_loopback",
 325         .name                   = "TCM_Loopback",
 326         .queuecommand           = tcm_loop_queuecommand,
 327         .change_queue_depth     = scsi_change_queue_depth,
 328         .eh_abort_handler = tcm_loop_abort_task,
 329         .eh_device_reset_handler = tcm_loop_device_reset,
 330         .eh_target_reset_handler = tcm_loop_target_reset,
 331         .can_queue              = 1024,
 332         .this_id                = -1,
 333         .sg_tablesize           = 256,
 334         .cmd_per_lun            = 1024,
 335         .max_sectors            = 0xFFFF,
 336         .use_clustering         = DISABLE_CLUSTERING,
 337         .slave_alloc            = tcm_loop_slave_alloc,
 338         .module                 = THIS_MODULE,
 339         .track_queue_depth      = 1,
 340 };
 341
 342 static int tcm_loop_driver_probe(struct device *dev)
 343 {
 344         struct tcm_loop_hba *tl_hba;
 345         struct Scsi_Host *sh;
 346         int error, host_prot;
 347
 348         tl_hba = to_tcm_loop_hba(dev);
 349
 350         sh = scsi_host_alloc(&tcm_loop_driver_template,
 351                         sizeof(struct tcm_loop_hba));
 352         if (!sh) {
 353                 pr_err("Unable to allocate struct scsi_host\n");
 354                 return -ENODEV;
 355         }
 356         tl_hba->sh = sh;
 357
 358         /*
 359          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 360          */
 361         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 362         /*
 363          * Setup single ID, Channel and LUN for now..
 364          */
 365         sh->max_id = 2;
 366         sh->max_lun = 0;
 367         sh->max_channel = 0;
 368         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 369
 370         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 371                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 372                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 373
 374         scsi_host_set_prot(sh, host_prot);
 375         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 376
 377         error = scsi_add_host(sh, &tl_hba->dev);
 378         if (error) {
 379                 pr_err("%s: scsi_add_host failed\n", __func__);
 380                 scsi_host_put(sh);
 381                 return -ENODEV;
 382         }
 383         return 0;
 384 }
 385
 386 static int tcm_loop_driver_remove(struct device *dev)
 387 {
 388         struct tcm_loop_hba *tl_hba;
 389         struct Scsi_Host *sh;
 390
 391         tl_hba = to_tcm_loop_hba(dev);
 392         sh = tl_hba->sh;
 393
 394         scsi_remove_host(sh);
 395         scsi_host_put(sh);
 396         return 0;
 397 }
 398
 399 static void tcm_loop_release_adapter(struct device *dev)
 400 {
 401         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 402
 403         kfree(tl_hba);
 404 }
 405
 406 /*
 407  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 408  */
 409 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 410 {
 411         int ret;
 412
 413         tl_hba->dev.bus = &tcm_loop_lld_bus;
 414         tl_hba->dev.parent = tcm_loop_primary;
 415         tl_hba->dev.release = &tcm_loop_release_adapter;
 416         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 417
 418         ret = device_register(&tl_hba->dev);
 419         if (ret) {
 420                 pr_err("device_register() failed for"
 421                                 " tl_hba->dev: %d\n", ret);
 422                 return -ENODEV;
 423         }
 424
 425         return 0;
 426 }
 427
 428 /*
 429  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 430  * tcm_loop SCSI bus.
 431  */
 432 static int tcm_loop_alloc_core_bus(void)
 433 {
 434         int ret;
 435
 436         tcm_loop_primary = root_device_register("tcm_loop_0");
 437         if (IS_ERR(tcm_loop_primary)) {
 438                 pr_err("Unable to allocate tcm_loop_primary\n");
 439                 return PTR_ERR(tcm_loop_primary);
 440         }
 441
 442         ret = bus_register(&tcm_loop_lld_bus);
 443         if (ret) {
 444                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 445                 goto dev_unreg;
 446         }
 447
 448         ret = driver_register(&tcm_loop_driverfs);
 449         if (ret) {
 450                 pr_err("driver_register() failed for"
 451                                 "tcm_loop_driverfs\n");
 452                 goto bus_unreg;
 453         }
 454
 455         pr_debug("Initialized TCM Loop Core Bus\n");
 456         return ret;
 457
 458 bus_unreg:
 459         bus_unregister(&tcm_loop_lld_bus);
 460 dev_unreg:
 461         root_device_unregister(tcm_loop_primary);
 462         return ret;
 463 }
 464
 465 static void tcm_loop_release_core_bus(void)
 466 {
 467         driver_unregister(&tcm_loop_driverfs);
 468         bus_unregister(&tcm_loop_lld_bus);
 469         root_device_unregister(tcm_loop_primary);
 470
 471         pr_debug("Releasing TCM Loop Core BUS\n");
 472 }
 473
 474 static char *tcm_loop_get_fabric_name(void)
 475 {
 476         return "loopback";
 477 }
 478
 479 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 480 {
 481         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 482 }
 483
 484 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 485 {
 486         /*
 487          * Return the passed NAA identifier for the Target Port
 488          */
 489         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 490 }
 491
 492 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 493 {
 494         /*
 495          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 496          * to represent the SCSI Target Port.
 497          */
 498         return tl_tpg(se_tpg)->tl_tpgt;
 499 }
 500
 501 /*
 502  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 503  * based upon the incoming fabric dependent SCSI Initiator Port
 504  */
 505 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 506 {
 507         return 1;
 508 }
 509
 510 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 511 {
 512         return 0;
 513 }
 514
 515 /*
 516  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 517  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 518  */
 519 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 520 {
 521         return 0;
 522 }
 523
 524 /*
 525  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 526  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 527  * It has been added here as a nop for target_fabric_tf_ops_check()
 528  */
 529 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 530 {
 531         return 0;
 532 }
 533
 534 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 535 {
 536         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 537                                                    tl_se_tpg);
 538         return tl_tpg->tl_fabric_prot_type;
 539 }
 540
 541 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 542 {
 543         return 1;
 544 }
 545
 546 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 547 {
 548         return 1;
 549 }
 550
 551 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 552 {
 553         return;
 554 }
 555
 556 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 557 {
 558         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 559                         struct tcm_loop_cmd, tl_se_cmd);
 560
 561         return tl_cmd->sc_cmd_state;
 562 }
 563
 564 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 565 {
 566         /*
 567          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 568          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 569          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 570          * format with transport_generic_map_mem_to_cmd().
 571          *
 572          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 573          * object execution queue.
 574          */
 575         target_execute_cmd(se_cmd);
 576         return 0;
 577 }
 578
 579 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 580 {
 581         return 0;
 582 }
 583
 584 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 585 {
 586         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 587                                 struct tcm_loop_cmd, tl_se_cmd);
 588         struct scsi_cmnd *sc = tl_cmd->sc;
 589
 590         pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
 591                      " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 592
 593         sc->result = SAM_STAT_GOOD;
 594         set_host_byte(sc, DID_OK);
 595         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 596             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 597                 scsi_set_resid(sc, se_cmd->residual_count);
 598         sc->scsi_done(sc);
 599         return 0;
 600 }
 601
 602 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 603 {
 604         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 605                                 struct tcm_loop_cmd, tl_se_cmd);
 606         struct scsi_cmnd *sc = tl_cmd->sc;
 607
 608         pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
 609                         " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 610
 611         if (se_cmd->sense_buffer &&
 612            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 613             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 614
 615                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 616                                 SCSI_SENSE_BUFFERSIZE);
 617                 sc->result = SAM_STAT_CHECK_CONDITION;
 618                 set_driver_byte(sc, DRIVER_SENSE);
 619         } else
 620                 sc->result = se_cmd->scsi_status;
 621
 622         set_host_byte(sc, DID_OK);
 623         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 624             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 625                 scsi_set_resid(sc, se_cmd->residual_count);
 626         sc->scsi_done(sc);
 627         return 0;
 628 }
 629
 630 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 631 {
 632         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 633                                 struct tcm_loop_cmd, tl_se_cmd);
 634
 635         /* Wake up tcm_loop_issue_tmr(). */
 636         complete(&tl_cmd->tmr_done);
 637 }
 638
 639 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 640 {
 641         return;
 642 }
 643
 644 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 645 {
 646         switch (tl_hba->tl_proto_id) {
 647         case SCSI_PROTOCOL_SAS:
 648                 return "SAS";
 649         case SCSI_PROTOCOL_FCP:
 650                 return "FCP";
 651         case SCSI_PROTOCOL_ISCSI:
 652                 return "iSCSI";
 653         default:
 654                 break;
 655         }
 656
 657         return "Unknown";
 658 }
 659
 660 /* Start items for tcm_loop_port_cit */
 661
 662 static int tcm_loop_port_link(
 663         struct se_portal_group *se_tpg,
 664         struct se_lun *lun)
 665 {
 666         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 667                                 struct tcm_loop_tpg, tl_se_tpg);
 668         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 669
 670         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 671         /*
 672          * Add Linux/SCSI struct scsi_device by HCTL
 673          */
 674         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 675
 676         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 677         return 0;
 678 }
 679
 680 static void tcm_loop_port_unlink(
 681         struct se_portal_group *se_tpg,
 682         struct se_lun *se_lun)
 683 {
 684         struct scsi_device *sd;
 685         struct tcm_loop_hba *tl_hba;
 686         struct tcm_loop_tpg *tl_tpg;
 687
 688         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 689         tl_hba = tl_tpg->tl_hba;
 690
 691         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 692                                 se_lun->unpacked_lun);
 693         if (!sd) {
 694                 pr_err("Unable to locate struct scsi_device for %d:%d:"
 695                         "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 696                 return;
 697         }
 698         /*
 699          * Remove Linux/SCSI struct scsi_device by HCTL
 700          */
 701         scsi_remove_device(sd);
 702         scsi_device_put(sd);
 703
 704         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 705
 706         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 707 }
 708
 709 /* End items for tcm_loop_port_cit */
 710
 711 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 712                 struct config_item *item, char *page)
 713 {
 714         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 715         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 716                                                    tl_se_tpg);
 717
 718         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 719 }
 720
 721 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 722                 struct config_item *item, const char *page, size_t count)
 723 {
 724         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 725         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 726                                                    tl_se_tpg);
 727         unsigned long val;
 728         int ret = kstrtoul(page, 0, &val);
 729
 730         if (ret) {
 731                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 732                 return ret;
 733         }
 734         if (val != 0 && val != 1 && val != 3) {
 735                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 736                 return -EINVAL;
 737         }
 738         tl_tpg->tl_fabric_prot_type = val;
 739
 740         return count;
 741 }
 742
 743 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 744
 745 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 746         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 747         NULL,
 748 };
 749
 750 /* Start items for tcm_loop_nexus_cit */
 751
 752 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
 753                                   struct se_session *se_sess, void *p)
 754 {
 755         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 756                                         struct tcm_loop_tpg, tl_se_tpg);
 757
 758         tl_tpg->tl_nexus = p;
 759         return 0;
 760 }
 761
 762 static int tcm_loop_make_nexus(
 763         struct tcm_loop_tpg *tl_tpg,
 764         const char *name)
 765 {
 766         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 767         struct tcm_loop_nexus *tl_nexus;
 768         int ret;
 769
 770         if (tl_tpg->tl_nexus) {
 771                 pr_debug("tl_tpg->tl_nexus already exists\n");
 772                 return -EEXIST;
 773         }
 774
 775         tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
 776         if (!tl_nexus) {
 777                 pr_err("Unable to allocate struct tcm_loop_nexus\n");
 778                 return -ENOMEM;
 779         }
 780
 781         tl_nexus->se_sess = target_alloc_session(&tl_tpg->tl_se_tpg, 0, 0,
 782                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
 783                                         name, tl_nexus, tcm_loop_alloc_sess_cb);
 784         if (IS_ERR(tl_nexus->se_sess)) {
 785                 ret = PTR_ERR(tl_nexus->se_sess);
 786                 kfree(tl_nexus);
 787                 return ret;
 788         }
 789
 790         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
 791                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
 792                 name);
 793         return 0;
 794 }
 795
 796 static int tcm_loop_drop_nexus(
 797         struct tcm_loop_tpg *tpg)
 798 {
 799         struct se_session *se_sess;
 800         struct tcm_loop_nexus *tl_nexus;
 801
 802         tl_nexus = tpg->tl_nexus;
 803         if (!tl_nexus)
 804                 return -ENODEV;
 805
 806         se_sess = tl_nexus->se_sess;
 807         if (!se_sess)
 808                 return -ENODEV;
 809
 810         if (atomic_read(&tpg->tl_tpg_port_count)) {
 811                 pr_err("Unable to remove TCM_Loop I_T Nexus with"
 812                         " active TPG port count: %d\n",
 813                         atomic_read(&tpg->tl_tpg_port_count));
 814                 return -EPERM;
 815         }
 816
 817         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
 818                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
 819                 tl_nexus->se_sess->se_node_acl->initiatorname);
 820         /*
 821          * Release the SCSI I_T Nexus to the emulated Target Port
 822          */
 823         transport_deregister_session(tl_nexus->se_sess);
 824         tpg->tl_nexus = NULL;
 825         kfree(tl_nexus);
 826         return 0;
 827 }
 828
 829 /* End items for tcm_loop_nexus_cit */
 830
 831 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 832 {
 833         struct se_portal_group *se_tpg = to_tpg(item);
 834         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 835                         struct tcm_loop_tpg, tl_se_tpg);
 836         struct tcm_loop_nexus *tl_nexus;
 837         ssize_t ret;
 838
 839         tl_nexus = tl_tpg->tl_nexus;
 840         if (!tl_nexus)
 841                 return -ENODEV;
 842
 843         ret = snprintf(page, PAGE_SIZE, "%s\n",
 844                 tl_nexus->se_sess->se_node_acl->initiatorname);
 845
 846         return ret;
 847 }
 848
 849 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 850                 const char *page, size_t count)
 851 {
 852         struct se_portal_group *se_tpg = to_tpg(item);
 853         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 854                         struct tcm_loop_tpg, tl_se_tpg);
 855         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 856         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 857         int ret;
 858         /*
 859          * Shutdown the active I_T nexus if 'NULL' is passed..
 860          */
 861         if (!strncmp(page, "NULL", 4)) {
 862                 ret = tcm_loop_drop_nexus(tl_tpg);
 863                 return (!ret) ? count : ret;
 864         }
 865         /*
 866          * Otherwise make sure the passed virtual Initiator port WWN matches
 867          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 868          * tcm_loop_make_nexus()
 869          */
 870         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 871                 pr_err("Emulated NAA Sas Address: %s, exceeds"
 872                                 " max: %d\n", page, TL_WWN_ADDR_LEN);
 873                 return -EINVAL;
 874         }
 875         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 876
 877         ptr = strstr(i_port, "naa.");
 878         if (ptr) {
 879                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 880                         pr_err("Passed SAS Initiator Port %s does not"
 881                                 " match target port protoid: %s\n", i_port,
 882                                 tcm_loop_dump_proto_id(tl_hba));
 883                         return -EINVAL;
 884                 }
 885                 port_ptr = &i_port[0];
 886                 goto check_newline;
 887         }
 888         ptr = strstr(i_port, "fc.");
 889         if (ptr) {
 890                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 891                         pr_err("Passed FCP Initiator Port %s does not"
 892                                 " match target port protoid: %s\n", i_port,
 893                                 tcm_loop_dump_proto_id(tl_hba));
 894                         return -EINVAL;
 895                 }
 896                 port_ptr = &i_port[3]; /* Skip over "fc." */
 897                 goto check_newline;
 898         }
 899         ptr = strstr(i_port, "iqn.");
 900         if (ptr) {
 901                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 902                         pr_err("Passed iSCSI Initiator Port %s does not"
 903                                 " match target port protoid: %s\n", i_port,
 904                                 tcm_loop_dump_proto_id(tl_hba));
 905                         return -EINVAL;
 906                 }
 907                 port_ptr = &i_port[0];
 908                 goto check_newline;
 909         }
 910         pr_err("Unable to locate prefix for emulated Initiator Port:"
 911                         " %s\n", i_port);
 912         return -EINVAL;
 913         /*
 914          * Clear any trailing newline for the NAA WWN
 915          */
 916 check_newline:
 917         if (i_port[strlen(i_port)-1] == '\n')
 918                 i_port[strlen(i_port)-1] = '\0';
 919
 920         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 921         if (ret < 0)
 922                 return ret;
 923
 924         return count;
 925 }
 926
 927 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 928                 char *page)
 929 {
 930         struct se_portal_group *se_tpg = to_tpg(item);
 931         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 932                         struct tcm_loop_tpg, tl_se_tpg);
 933         const char *status = NULL;
 934         ssize_t ret = -EINVAL;
 935
 936         switch (tl_tpg->tl_transport_status) {
 937         case TCM_TRANSPORT_ONLINE:
 938                 status = "online";
 939                 break;
 940         case TCM_TRANSPORT_OFFLINE:
 941                 status = "offline";
 942                 break;
 943         default:
 944                 break;
 945         }
 946
 947         if (status)
 948                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 949
 950         return ret;
 951 }
 952
 953 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
 954                 const char *page, size_t count)
 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
 960         if (!strncmp(page, "online", 6)) {
 961                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 962                 return count;
 963         }
 964         if (!strncmp(page, "offline", 7)) {
 965                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
 966                 if (tl_tpg->tl_nexus) {
 967                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 968
 969                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
 970                 }
 971                 return count;
 972         }
 973         return -EINVAL;
 974 }
 975
 976 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
 977                                          char *page)
 978 {
 979         struct se_portal_group *se_tpg = to_tpg(item);
 980         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 981                         struct tcm_loop_tpg, tl_se_tpg);
 982         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 983
 984         return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
 985                         tl_hba->sh->host_no, tl_tpg->tl_tpgt);
 986 }
 987
 988 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
 989 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
 990 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 991
 992 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
 993         &tcm_loop_tpg_attr_nexus,
 994         &tcm_loop_tpg_attr_transport_status,
 995         &tcm_loop_tpg_attr_address,
 996         NULL,
 997 };
 998
 999 /* Start items for tcm_loop_naa_cit */
1000
1001 static struct se_portal_group *tcm_loop_make_naa_tpg(
1002         struct se_wwn *wwn,
1003         struct config_group *group,
1004         const char *name)
1005 {
1006         struct tcm_loop_hba *tl_hba = container_of(wwn,
1007                         struct tcm_loop_hba, tl_hba_wwn);
1008         struct tcm_loop_tpg *tl_tpg;
1009         int ret;
1010         unsigned long tpgt;
1011
1012         if (strstr(name, "tpgt_") != name) {
1013                 pr_err("Unable to locate \"tpgt_#\" directory"
1014                                 " group\n");
1015                 return ERR_PTR(-EINVAL);
1016         }
1017         if (kstrtoul(name+5, 10, &tpgt))
1018                 return ERR_PTR(-EINVAL);
1019
1020         if (tpgt >= TL_TPGS_PER_HBA) {
1021                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
1022                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
1023                 return ERR_PTR(-EINVAL);
1024         }
1025         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1026         tl_tpg->tl_hba = tl_hba;
1027         tl_tpg->tl_tpgt = tpgt;
1028         /*
1029          * Register the tl_tpg as a emulated TCM Target Endpoint
1030          */
1031         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1032         if (ret < 0)
1033                 return ERR_PTR(-ENOMEM);
1034
1035         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1036                 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
1037                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1038
1039         return &tl_tpg->tl_se_tpg;
1040 }
1041
1042 static void tcm_loop_drop_naa_tpg(
1043         struct se_portal_group *se_tpg)
1044 {
1045         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1046         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1047                                 struct tcm_loop_tpg, tl_se_tpg);
1048         struct tcm_loop_hba *tl_hba;
1049         unsigned short tpgt;
1050
1051         tl_hba = tl_tpg->tl_hba;
1052         tpgt = tl_tpg->tl_tpgt;
1053         /*
1054          * Release the I_T Nexus for the Virtual target link if present
1055          */
1056         tcm_loop_drop_nexus(tl_tpg);
1057         /*
1058          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1059          */
1060         core_tpg_deregister(se_tpg);
1061
1062         tl_tpg->tl_hba = NULL;
1063         tl_tpg->tl_tpgt = 0;
1064
1065         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1066                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1067                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1068 }
1069
1070 /* End items for tcm_loop_naa_cit */
1071
1072 /* Start items for tcm_loop_cit */
1073
1074 static struct se_wwn *tcm_loop_make_scsi_hba(
1075         struct target_fabric_configfs *tf,
1076         struct config_group *group,
1077         const char *name)
1078 {
1079         struct tcm_loop_hba *tl_hba;
1080         struct Scsi_Host *sh;
1081         char *ptr;
1082         int ret, off = 0;
1083
1084         tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1085         if (!tl_hba) {
1086                 pr_err("Unable to allocate struct tcm_loop_hba\n");
1087                 return ERR_PTR(-ENOMEM);
1088         }
1089         /*
1090          * Determine the emulated Protocol Identifier and Target Port Name
1091          * based on the incoming configfs directory name.
1092          */
1093         ptr = strstr(name, "naa.");
1094         if (ptr) {
1095                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1096                 goto check_len;
1097         }
1098         ptr = strstr(name, "fc.");
1099         if (ptr) {
1100                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1101                 off = 3; /* Skip over "fc." */
1102                 goto check_len;
1103         }
1104         ptr = strstr(name, "iqn.");
1105         if (!ptr) {
1106                 pr_err("Unable to locate prefix for emulated Target "
1107                                 "Port: %s\n", name);
1108                 ret = -EINVAL;
1109                 goto out;
1110         }
1111         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1112
1113 check_len:
1114         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1115                 pr_err("Emulated NAA %s Address: %s, exceeds"
1116                         " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1117                         TL_WWN_ADDR_LEN);
1118                 ret = -EINVAL;
1119                 goto out;
1120         }
1121         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1122
1123         /*
1124          * Call device_register(tl_hba->dev) to register the emulated
1125          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1126          * device_register() callbacks in tcm_loop_driver_probe()
1127          */
1128         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1129         if (ret)
1130                 goto out;
1131
1132         sh = tl_hba->sh;
1133         tcm_loop_hba_no_cnt++;
1134         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1135                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1136                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1137
1138         return &tl_hba->tl_hba_wwn;
1139 out:
1140         kfree(tl_hba);
1141         return ERR_PTR(ret);
1142 }
1143
1144 static void tcm_loop_drop_scsi_hba(
1145         struct se_wwn *wwn)
1146 {
1147         struct tcm_loop_hba *tl_hba = container_of(wwn,
1148                                 struct tcm_loop_hba, tl_hba_wwn);
1149
1150         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1151                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1152                 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1153                 tl_hba->sh->host_no);
1154         /*
1155          * Call device_unregister() on the original tl_hba->dev.
1156          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1157          * release *tl_hba;
1158          */
1159         device_unregister(&tl_hba->dev);
1160 }
1161
1162 /* Start items for tcm_loop_cit */
1163 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1164 {
1165         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1166 }
1167
1168 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1169
1170 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1171         &tcm_loop_wwn_attr_version,
1172         NULL,
1173 };
1174
1175 /* End items for tcm_loop_cit */
1176
1177 static const struct target_core_fabric_ops loop_ops = {
1178         .module                         = THIS_MODULE,
1179         .name                           = "loopback",
1180         .get_fabric_name                = tcm_loop_get_fabric_name,
1181         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1182         .tpg_get_tag                    = tcm_loop_get_tag,
1183         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1184         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1185         .tpg_check_demo_mode_write_protect =
1186                                 tcm_loop_check_demo_mode_write_protect,
1187         .tpg_check_prod_mode_write_protect =
1188                                 tcm_loop_check_prod_mode_write_protect,
1189         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1190         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1191         .check_stop_free                = tcm_loop_check_stop_free,
1192         .release_cmd                    = tcm_loop_release_cmd,
1193         .sess_get_index                 = tcm_loop_sess_get_index,
1194         .write_pending                  = tcm_loop_write_pending,
1195         .write_pending_status           = tcm_loop_write_pending_status,
1196         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1197         .get_cmd_state                  = tcm_loop_get_cmd_state,
1198         .queue_data_in                  = tcm_loop_queue_data_in,
1199         .queue_status                   = tcm_loop_queue_status,
1200         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1201         .aborted_task                   = tcm_loop_aborted_task,
1202         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1203         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1204         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1205         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1206         .fabric_post_link               = tcm_loop_port_link,
1207         .fabric_pre_unlink              = tcm_loop_port_unlink,
1208         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1209         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1210         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1211 };
1212
1213 static int __init tcm_loop_fabric_init(void)
1214 {
1215         int ret = -ENOMEM;
1216
1217         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1218         if (!tcm_loop_workqueue)
1219                 goto out;
1220
1221         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1222                                 sizeof(struct tcm_loop_cmd),
1223                                 __alignof__(struct tcm_loop_cmd),
1224                                 0, NULL);
1225         if (!tcm_loop_cmd_cache) {
1226                 pr_debug("kmem_cache_create() for"
1227                         " tcm_loop_cmd_cache failed\n");
1228                 goto out_destroy_workqueue;
1229         }
1230
1231         ret = tcm_loop_alloc_core_bus();
1232         if (ret)
1233                 goto out_destroy_cache;
1234
1235         ret = target_register_template(&loop_ops);
1236         if (ret)
1237                 goto out_release_core_bus;
1238
1239         return 0;
1240
1241 out_release_core_bus:
1242         tcm_loop_release_core_bus();
1243 out_destroy_cache:
1244         kmem_cache_destroy(tcm_loop_cmd_cache);
1245 out_destroy_workqueue:
1246         destroy_workqueue(tcm_loop_workqueue);
1247 out:
1248         return ret;
1249 }
1250
1251 static void __exit tcm_loop_fabric_exit(void)
1252 {
1253         target_unregister_template(&loop_ops);
1254         tcm_loop_release_core_bus();
1255         kmem_cache_destroy(tcm_loop_cmd_cache);
1256         destroy_workqueue(tcm_loop_workqueue);
1257 }
1258
1259 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1260 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1261 MODULE_LICENSE("GPL");
1262 module_init(tcm_loop_fabric_init);
1263 module_exit(tcm_loop_fabric_exit);