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         /*
  55          * Do not release struct se_cmd's containing a valid TMR
  56          * pointer.  These will be released directly in tcm_loop_device_reset()
  57          * with transport_generic_free_cmd().
  58          */
  59         if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
  60                 return 0;
  61         /*
  62          * Release the struct se_cmd, which will make a callback to release
  63          * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
  64          */
  65         transport_generic_free_cmd(se_cmd, 0);
  66         return 1;
  67 }
  68
  69 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
  70 {
  71         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
  72                                 struct tcm_loop_cmd, tl_se_cmd);
  73
  74         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
  75 }
  76
  77 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
  78 {
  79         seq_printf(m, "tcm_loop_proc_info()\n");
  80         return 0;
  81 }
  82
  83 static int tcm_loop_driver_probe(struct device *);
  84 static int tcm_loop_driver_remove(struct device *);
  85
  86 static int pseudo_lld_bus_match(struct device *dev,
  87                                 struct device_driver *dev_driver)
  88 {
  89         return 1;
  90 }
  91
  92 static struct bus_type tcm_loop_lld_bus = {
  93         .name                   = "tcm_loop_bus",
  94         .match                  = pseudo_lld_bus_match,
  95         .probe                  = tcm_loop_driver_probe,
  96         .remove                 = tcm_loop_driver_remove,
  97 };
  98
  99 static struct device_driver tcm_loop_driverfs = {
 100         .name                   = "tcm_loop",
 101         .bus                    = &tcm_loop_lld_bus,
 102 };
 103 /*
 104  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
 105  */
 106 static struct device *tcm_loop_primary;
 107
 108 static void tcm_loop_submission_work(struct work_struct *work)
 109 {
 110         struct tcm_loop_cmd *tl_cmd =
 111                 container_of(work, struct tcm_loop_cmd, work);
 112         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
 113         struct scsi_cmnd *sc = tl_cmd->sc;
 114         struct tcm_loop_nexus *tl_nexus;
 115         struct tcm_loop_hba *tl_hba;
 116         struct tcm_loop_tpg *tl_tpg;
 117         struct scatterlist *sgl_bidi = NULL;
 118         u32 sgl_bidi_count = 0, transfer_length;
 119         int rc;
 120
 121         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 122         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 123
 124         /*
 125          * Ensure that this tl_tpg reference from the incoming sc->device->id
 126          * has already been configured via tcm_loop_make_naa_tpg().
 127          */
 128         if (!tl_tpg->tl_hba) {
 129                 set_host_byte(sc, DID_NO_CONNECT);
 130                 goto out_done;
 131         }
 132         if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
 133                 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 134                 goto out_done;
 135         }
 136         tl_nexus = tl_tpg->tl_nexus;
 137         if (!tl_nexus) {
 138                 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
 139                                 " does not exist\n");
 140                 set_host_byte(sc, DID_ERROR);
 141                 goto out_done;
 142         }
 143         if (scsi_bidi_cmnd(sc)) {
 144                 struct scsi_data_buffer *sdb = scsi_in(sc);
 145
 146                 sgl_bidi = sdb->table.sgl;
 147                 sgl_bidi_count = sdb->table.nents;
 148                 se_cmd->se_cmd_flags |= SCF_BIDI;
 149
 150         }
 151
 152         transfer_length = scsi_transfer_length(sc);
 153         if (!scsi_prot_sg_count(sc) &&
 154             scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
 155                 se_cmd->prot_pto = true;
 156                 /*
 157                  * loopback transport doesn't support
 158                  * WRITE_GENERATE, READ_STRIP protection
 159                  * information operations, go ahead unprotected.
 160                  */
 161                 transfer_length = scsi_bufflen(sc);
 162         }
 163
 164         se_cmd->tag = tl_cmd->sc_cmd_tag;
 165         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
 166                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
 167                         transfer_length, TCM_SIMPLE_TAG,
 168                         sc->sc_data_direction, 0,
 169                         scsi_sglist(sc), scsi_sg_count(sc),
 170                         sgl_bidi, sgl_bidi_count,
 171                         scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
 172         if (rc < 0) {
 173                 set_host_byte(sc, DID_NO_CONNECT);
 174                 goto out_done;
 175         }
 176         return;
 177
 178 out_done:
 179         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 180         sc->scsi_done(sc);
 181         return;
 182 }
 183
 184 /*
 185  * ->queuecommand can be and usually is called from interrupt context, so
 186  * defer the actual submission to a workqueue.
 187  */
 188 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
 189 {
 190         struct tcm_loop_cmd *tl_cmd;
 191
 192         pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
 193                 " scsi_buf_len: %u\n", sc->device->host->host_no,
 194                 sc->device->id, sc->device->channel, sc->device->lun,
 195                 sc->cmnd[0], scsi_bufflen(sc));
 196
 197         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
 198         if (!tl_cmd) {
 199                 pr_err("Unable to allocate struct tcm_loop_cmd\n");
 200                 set_host_byte(sc, DID_ERROR);
 201                 sc->scsi_done(sc);
 202                 return 0;
 203         }
 204
 205         tl_cmd->sc = sc;
 206         tl_cmd->sc_cmd_tag = sc->request->tag;
 207         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
 208         queue_work(tcm_loop_workqueue, &tl_cmd->work);
 209         return 0;
 210 }
 211
 212 /*
 213  * Called from SCSI EH process context to issue a LUN_RESET TMR
 214  * to struct scsi_device
 215  */
 216 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 217                               u64 lun, int task, enum tcm_tmreq_table tmr)
 218 {
 219         struct se_cmd *se_cmd = NULL;
 220         struct se_session *se_sess;
 221         struct se_portal_group *se_tpg;
 222         struct tcm_loop_nexus *tl_nexus;
 223         struct tcm_loop_cmd *tl_cmd = NULL;
 224         struct tcm_loop_tmr *tl_tmr = NULL;
 225         int ret = TMR_FUNCTION_FAILED, rc;
 226
 227         /*
 228          * Locate the tl_nexus and se_sess pointers
 229          */
 230         tl_nexus = tl_tpg->tl_nexus;
 231         if (!tl_nexus) {
 232                 pr_err("Unable to perform device reset without"
 233                                 " active I_T Nexus\n");
 234                 return ret;
 235         }
 236
 237         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 238         if (!tl_cmd) {
 239                 pr_err("Unable to allocate memory for tl_cmd\n");
 240                 return ret;
 241         }
 242
 243         tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
 244         if (!tl_tmr) {
 245                 pr_err("Unable to allocate memory for tl_tmr\n");
 246                 goto release;
 247         }
 248         init_waitqueue_head(&tl_tmr->tl_tmr_wait);
 249
 250         se_cmd = &tl_cmd->tl_se_cmd;
 251         se_tpg = &tl_tpg->tl_se_tpg;
 252         se_sess = tl_tpg->tl_nexus->se_sess;
 253         /*
 254          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 255          */
 256         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
 257                                 DMA_NONE, TCM_SIMPLE_TAG,
 258                                 &tl_cmd->tl_sense_buf[0]);
 259
 260         rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
 261         if (rc < 0)
 262                 goto release;
 263
 264         if (tmr == TMR_ABORT_TASK)
 265                 se_cmd->se_tmr_req->ref_task_tag = task;
 266
 267         /*
 268          * Locate the underlying TCM struct se_lun
 269          */
 270         if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
 271                 ret = TMR_LUN_DOES_NOT_EXIST;
 272                 goto release;
 273         }
 274         /*
 275          * Queue the TMR to TCM Core and sleep waiting for
 276          * tcm_loop_queue_tm_rsp() to wake us up.
 277          */
 278         transport_generic_handle_tmr(se_cmd);
 279         wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
 280         /*
 281          * The TMR LUN_RESET has completed, check the response status and
 282          * then release allocations.
 283          */
 284         ret = se_cmd->se_tmr_req->response;
 285 release:
 286         if (se_cmd)
 287                 transport_generic_free_cmd(se_cmd, 1);
 288         else
 289                 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 290         kfree(tl_tmr);
 291         return ret;
 292 }
 293
 294 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 295 {
 296         struct tcm_loop_hba *tl_hba;
 297         struct tcm_loop_tpg *tl_tpg;
 298         int ret = FAILED;
 299
 300         /*
 301          * Locate the tcm_loop_hba_t pointer
 302          */
 303         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 304         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 305         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 306                                  sc->request->tag, TMR_ABORT_TASK);
 307         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 308 }
 309
 310 /*
 311  * Called from SCSI EH process context to issue a LUN_RESET TMR
 312  * to struct scsi_device
 313  */
 314 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 315 {
 316         struct tcm_loop_hba *tl_hba;
 317         struct tcm_loop_tpg *tl_tpg;
 318         int ret = FAILED;
 319
 320         /*
 321          * Locate the tcm_loop_hba_t pointer
 322          */
 323         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 324         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 325
 326         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 327                                  0, TMR_LUN_RESET);
 328         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 329 }
 330
 331 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 332 {
 333         struct tcm_loop_hba *tl_hba;
 334         struct tcm_loop_tpg *tl_tpg;
 335
 336         /*
 337          * Locate the tcm_loop_hba_t pointer
 338          */
 339         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 340         if (!tl_hba) {
 341                 pr_err("Unable to perform device reset without"
 342                                 " active I_T Nexus\n");
 343                 return FAILED;
 344         }
 345         /*
 346          * Locate the tl_tpg pointer from TargetID in sc->device->id
 347          */
 348         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 349         if (tl_tpg) {
 350                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 351                 return SUCCESS;
 352         }
 353         return FAILED;
 354 }
 355
 356 static int tcm_loop_slave_alloc(struct scsi_device *sd)
 357 {
 358         set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
 359         return 0;
 360 }
 361
 362 static struct scsi_host_template tcm_loop_driver_template = {
 363         .show_info              = tcm_loop_show_info,
 364         .proc_name              = "tcm_loopback",
 365         .name                   = "TCM_Loopback",
 366         .queuecommand           = tcm_loop_queuecommand,
 367         .change_queue_depth     = scsi_change_queue_depth,
 368         .eh_abort_handler = tcm_loop_abort_task,
 369         .eh_device_reset_handler = tcm_loop_device_reset,
 370         .eh_target_reset_handler = tcm_loop_target_reset,
 371         .can_queue              = 1024,
 372         .this_id                = -1,
 373         .sg_tablesize           = 256,
 374         .cmd_per_lun            = 1024,
 375         .max_sectors            = 0xFFFF,
 376         .use_clustering         = DISABLE_CLUSTERING,
 377         .slave_alloc            = tcm_loop_slave_alloc,
 378         .module                 = THIS_MODULE,
 379         .track_queue_depth      = 1,
 380 };
 381
 382 static int tcm_loop_driver_probe(struct device *dev)
 383 {
 384         struct tcm_loop_hba *tl_hba;
 385         struct Scsi_Host *sh;
 386         int error, host_prot;
 387
 388         tl_hba = to_tcm_loop_hba(dev);
 389
 390         sh = scsi_host_alloc(&tcm_loop_driver_template,
 391                         sizeof(struct tcm_loop_hba));
 392         if (!sh) {
 393                 pr_err("Unable to allocate struct scsi_host\n");
 394                 return -ENODEV;
 395         }
 396         tl_hba->sh = sh;
 397
 398         /*
 399          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 400          */
 401         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 402         /*
 403          * Setup single ID, Channel and LUN for now..
 404          */
 405         sh->max_id = 2;
 406         sh->max_lun = 0;
 407         sh->max_channel = 0;
 408         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 409
 410         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 411                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 412                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 413
 414         scsi_host_set_prot(sh, host_prot);
 415         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 416
 417         error = scsi_add_host(sh, &tl_hba->dev);
 418         if (error) {
 419                 pr_err("%s: scsi_add_host failed\n", __func__);
 420                 scsi_host_put(sh);
 421                 return -ENODEV;
 422         }
 423         return 0;
 424 }
 425
 426 static int tcm_loop_driver_remove(struct device *dev)
 427 {
 428         struct tcm_loop_hba *tl_hba;
 429         struct Scsi_Host *sh;
 430
 431         tl_hba = to_tcm_loop_hba(dev);
 432         sh = tl_hba->sh;
 433
 434         scsi_remove_host(sh);
 435         scsi_host_put(sh);
 436         return 0;
 437 }
 438
 439 static void tcm_loop_release_adapter(struct device *dev)
 440 {
 441         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 442
 443         kfree(tl_hba);
 444 }
 445
 446 /*
 447  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 448  */
 449 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 450 {
 451         int ret;
 452
 453         tl_hba->dev.bus = &tcm_loop_lld_bus;
 454         tl_hba->dev.parent = tcm_loop_primary;
 455         tl_hba->dev.release = &tcm_loop_release_adapter;
 456         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 457
 458         ret = device_register(&tl_hba->dev);
 459         if (ret) {
 460                 pr_err("device_register() failed for"
 461                                 " tl_hba->dev: %d\n", ret);
 462                 return -ENODEV;
 463         }
 464
 465         return 0;
 466 }
 467
 468 /*
 469  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 470  * tcm_loop SCSI bus.
 471  */
 472 static int tcm_loop_alloc_core_bus(void)
 473 {
 474         int ret;
 475
 476         tcm_loop_primary = root_device_register("tcm_loop_0");
 477         if (IS_ERR(tcm_loop_primary)) {
 478                 pr_err("Unable to allocate tcm_loop_primary\n");
 479                 return PTR_ERR(tcm_loop_primary);
 480         }
 481
 482         ret = bus_register(&tcm_loop_lld_bus);
 483         if (ret) {
 484                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 485                 goto dev_unreg;
 486         }
 487
 488         ret = driver_register(&tcm_loop_driverfs);
 489         if (ret) {
 490                 pr_err("driver_register() failed for"
 491                                 "tcm_loop_driverfs\n");
 492                 goto bus_unreg;
 493         }
 494
 495         pr_debug("Initialized TCM Loop Core Bus\n");
 496         return ret;
 497
 498 bus_unreg:
 499         bus_unregister(&tcm_loop_lld_bus);
 500 dev_unreg:
 501         root_device_unregister(tcm_loop_primary);
 502         return ret;
 503 }
 504
 505 static void tcm_loop_release_core_bus(void)
 506 {
 507         driver_unregister(&tcm_loop_driverfs);
 508         bus_unregister(&tcm_loop_lld_bus);
 509         root_device_unregister(tcm_loop_primary);
 510
 511         pr_debug("Releasing TCM Loop Core BUS\n");
 512 }
 513
 514 static char *tcm_loop_get_fabric_name(void)
 515 {
 516         return "loopback";
 517 }
 518
 519 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 520 {
 521         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 522 }
 523
 524 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 525 {
 526         /*
 527          * Return the passed NAA identifier for the Target Port
 528          */
 529         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 530 }
 531
 532 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 533 {
 534         /*
 535          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 536          * to represent the SCSI Target Port.
 537          */
 538         return tl_tpg(se_tpg)->tl_tpgt;
 539 }
 540
 541 /*
 542  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 543  * based upon the incoming fabric dependent SCSI Initiator Port
 544  */
 545 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 546 {
 547         return 1;
 548 }
 549
 550 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 551 {
 552         return 0;
 553 }
 554
 555 /*
 556  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 557  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 558  */
 559 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 560 {
 561         return 0;
 562 }
 563
 564 /*
 565  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 566  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 567  * It has been added here as a nop for target_fabric_tf_ops_check()
 568  */
 569 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 570 {
 571         return 0;
 572 }
 573
 574 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 575 {
 576         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 577                                                    tl_se_tpg);
 578         return tl_tpg->tl_fabric_prot_type;
 579 }
 580
 581 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 582 {
 583         return 1;
 584 }
 585
 586 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 587 {
 588         return 1;
 589 }
 590
 591 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 592 {
 593         return;
 594 }
 595
 596 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 597 {
 598         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 599                         struct tcm_loop_cmd, tl_se_cmd);
 600
 601         return tl_cmd->sc_cmd_state;
 602 }
 603
 604 static int tcm_loop_shutdown_session(struct se_session *se_sess)
 605 {
 606         return 0;
 607 }
 608
 609 static void tcm_loop_close_session(struct se_session *se_sess)
 610 {
 611         return;
 612 };
 613
 614 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 615 {
 616         /*
 617          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 618          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 619          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 620          * format with transport_generic_map_mem_to_cmd().
 621          *
 622          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 623          * object execution queue.
 624          */
 625         target_execute_cmd(se_cmd);
 626         return 0;
 627 }
 628
 629 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 630 {
 631         return 0;
 632 }
 633
 634 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 635 {
 636         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 637                                 struct tcm_loop_cmd, tl_se_cmd);
 638         struct scsi_cmnd *sc = tl_cmd->sc;
 639
 640         pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
 641                      " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 642
 643         sc->result = SAM_STAT_GOOD;
 644         set_host_byte(sc, DID_OK);
 645         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 646             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 647                 scsi_set_resid(sc, se_cmd->residual_count);
 648         sc->scsi_done(sc);
 649         return 0;
 650 }
 651
 652 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 653 {
 654         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 655                                 struct tcm_loop_cmd, tl_se_cmd);
 656         struct scsi_cmnd *sc = tl_cmd->sc;
 657
 658         pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
 659                         " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 660
 661         if (se_cmd->sense_buffer &&
 662            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 663             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 664
 665                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 666                                 SCSI_SENSE_BUFFERSIZE);
 667                 sc->result = SAM_STAT_CHECK_CONDITION;
 668                 set_driver_byte(sc, DRIVER_SENSE);
 669         } else
 670                 sc->result = se_cmd->scsi_status;
 671
 672         set_host_byte(sc, DID_OK);
 673         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 674             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 675                 scsi_set_resid(sc, se_cmd->residual_count);
 676         sc->scsi_done(sc);
 677         return 0;
 678 }
 679
 680 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 681 {
 682         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 683         struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
 684         /*
 685          * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
 686          * and wake up the wait_queue_head_t in tcm_loop_device_reset()
 687          */
 688         atomic_set(&tl_tmr->tmr_complete, 1);
 689         wake_up(&tl_tmr->tl_tmr_wait);
 690 }
 691
 692 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 693 {
 694         return;
 695 }
 696
 697 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 698 {
 699         switch (tl_hba->tl_proto_id) {
 700         case SCSI_PROTOCOL_SAS:
 701                 return "SAS";
 702         case SCSI_PROTOCOL_FCP:
 703                 return "FCP";
 704         case SCSI_PROTOCOL_ISCSI:
 705                 return "iSCSI";
 706         default:
 707                 break;
 708         }
 709
 710         return "Unknown";
 711 }
 712
 713 /* Start items for tcm_loop_port_cit */
 714
 715 static int tcm_loop_port_link(
 716         struct se_portal_group *se_tpg,
 717         struct se_lun *lun)
 718 {
 719         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 720                                 struct tcm_loop_tpg, tl_se_tpg);
 721         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 722
 723         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 724         /*
 725          * Add Linux/SCSI struct scsi_device by HCTL
 726          */
 727         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 728
 729         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 730         return 0;
 731 }
 732
 733 static void tcm_loop_port_unlink(
 734         struct se_portal_group *se_tpg,
 735         struct se_lun *se_lun)
 736 {
 737         struct scsi_device *sd;
 738         struct tcm_loop_hba *tl_hba;
 739         struct tcm_loop_tpg *tl_tpg;
 740
 741         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 742         tl_hba = tl_tpg->tl_hba;
 743
 744         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 745                                 se_lun->unpacked_lun);
 746         if (!sd) {
 747                 pr_err("Unable to locate struct scsi_device for %d:%d:"
 748                         "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 749                 return;
 750         }
 751         /*
 752          * Remove Linux/SCSI struct scsi_device by HCTL
 753          */
 754         scsi_remove_device(sd);
 755         scsi_device_put(sd);
 756
 757         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 758
 759         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 760 }
 761
 762 /* End items for tcm_loop_port_cit */
 763
 764 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 765                 struct config_item *item, char *page)
 766 {
 767         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 768         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 769                                                    tl_se_tpg);
 770
 771         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 772 }
 773
 774 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 775                 struct config_item *item, const char *page, size_t count)
 776 {
 777         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 778         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 779                                                    tl_se_tpg);
 780         unsigned long val;
 781         int ret = kstrtoul(page, 0, &val);
 782
 783         if (ret) {
 784                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 785                 return ret;
 786         }
 787         if (val != 0 && val != 1 && val != 3) {
 788                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 789                 return -EINVAL;
 790         }
 791         tl_tpg->tl_fabric_prot_type = val;
 792
 793         return count;
 794 }
 795
 796 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 797
 798 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 799         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 800         NULL,
 801 };
 802
 803 /* Start items for tcm_loop_nexus_cit */
 804
 805 static int tcm_loop_make_nexus(
 806         struct tcm_loop_tpg *tl_tpg,
 807         const char *name)
 808 {
 809         struct se_portal_group *se_tpg;
 810         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 811         struct tcm_loop_nexus *tl_nexus;
 812         int ret = -ENOMEM;
 813
 814         if (tl_tpg->tl_nexus) {
 815                 pr_debug("tl_tpg->tl_nexus already exists\n");
 816                 return -EEXIST;
 817         }
 818         se_tpg = &tl_tpg->tl_se_tpg;
 819
 820         tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
 821         if (!tl_nexus) {
 822                 pr_err("Unable to allocate struct tcm_loop_nexus\n");
 823                 return -ENOMEM;
 824         }
 825         /*
 826          * Initialize the struct se_session pointer
 827          */
 828         tl_nexus->se_sess = transport_init_session(
 829                                 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
 830         if (IS_ERR(tl_nexus->se_sess)) {
 831                 ret = PTR_ERR(tl_nexus->se_sess);
 832                 goto out;
 833         }
 834         /*
 835          * Since we are running in 'demo mode' this call with generate a
 836          * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
 837          * Initiator port name of the passed configfs group 'name'.
 838          */
 839         tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
 840                                 se_tpg, (unsigned char *)name);
 841         if (!tl_nexus->se_sess->se_node_acl) {
 842                 transport_free_session(tl_nexus->se_sess);
 843                 goto out;
 844         }
 845         /* Now, register the I_T Nexus as active. */
 846         transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
 847                         tl_nexus->se_sess, tl_nexus);
 848         tl_tpg->tl_nexus = tl_nexus;
 849         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
 850                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
 851                 name);
 852         return 0;
 853
 854 out:
 855         kfree(tl_nexus);
 856         return ret;
 857 }
 858
 859 static int tcm_loop_drop_nexus(
 860         struct tcm_loop_tpg *tpg)
 861 {
 862         struct se_session *se_sess;
 863         struct tcm_loop_nexus *tl_nexus;
 864
 865         tl_nexus = tpg->tl_nexus;
 866         if (!tl_nexus)
 867                 return -ENODEV;
 868
 869         se_sess = tl_nexus->se_sess;
 870         if (!se_sess)
 871                 return -ENODEV;
 872
 873         if (atomic_read(&tpg->tl_tpg_port_count)) {
 874                 pr_err("Unable to remove TCM_Loop I_T Nexus with"
 875                         " active TPG port count: %d\n",
 876                         atomic_read(&tpg->tl_tpg_port_count));
 877                 return -EPERM;
 878         }
 879
 880         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
 881                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
 882                 tl_nexus->se_sess->se_node_acl->initiatorname);
 883         /*
 884          * Release the SCSI I_T Nexus to the emulated Target Port
 885          */
 886         transport_deregister_session(tl_nexus->se_sess);
 887         tpg->tl_nexus = NULL;
 888         kfree(tl_nexus);
 889         return 0;
 890 }
 891
 892 /* End items for tcm_loop_nexus_cit */
 893
 894 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 895 {
 896         struct se_portal_group *se_tpg = to_tpg(item);
 897         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 898                         struct tcm_loop_tpg, tl_se_tpg);
 899         struct tcm_loop_nexus *tl_nexus;
 900         ssize_t ret;
 901
 902         tl_nexus = tl_tpg->tl_nexus;
 903         if (!tl_nexus)
 904                 return -ENODEV;
 905
 906         ret = snprintf(page, PAGE_SIZE, "%s\n",
 907                 tl_nexus->se_sess->se_node_acl->initiatorname);
 908
 909         return ret;
 910 }
 911
 912 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 913                 const char *page, size_t count)
 914 {
 915         struct se_portal_group *se_tpg = to_tpg(item);
 916         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 917                         struct tcm_loop_tpg, tl_se_tpg);
 918         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 919         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 920         int ret;
 921         /*
 922          * Shutdown the active I_T nexus if 'NULL' is passed..
 923          */
 924         if (!strncmp(page, "NULL", 4)) {
 925                 ret = tcm_loop_drop_nexus(tl_tpg);
 926                 return (!ret) ? count : ret;
 927         }
 928         /*
 929          * Otherwise make sure the passed virtual Initiator port WWN matches
 930          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 931          * tcm_loop_make_nexus()
 932          */
 933         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 934                 pr_err("Emulated NAA Sas Address: %s, exceeds"
 935                                 " max: %d\n", page, TL_WWN_ADDR_LEN);
 936                 return -EINVAL;
 937         }
 938         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 939
 940         ptr = strstr(i_port, "naa.");
 941         if (ptr) {
 942                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 943                         pr_err("Passed SAS Initiator Port %s does not"
 944                                 " match target port protoid: %s\n", i_port,
 945                                 tcm_loop_dump_proto_id(tl_hba));
 946                         return -EINVAL;
 947                 }
 948                 port_ptr = &i_port[0];
 949                 goto check_newline;
 950         }
 951         ptr = strstr(i_port, "fc.");
 952         if (ptr) {
 953                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 954                         pr_err("Passed FCP Initiator Port %s does not"
 955                                 " match target port protoid: %s\n", i_port,
 956                                 tcm_loop_dump_proto_id(tl_hba));
 957                         return -EINVAL;
 958                 }
 959                 port_ptr = &i_port[3]; /* Skip over "fc." */
 960                 goto check_newline;
 961         }
 962         ptr = strstr(i_port, "iqn.");
 963         if (ptr) {
 964                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 965                         pr_err("Passed iSCSI Initiator Port %s does not"
 966                                 " match target port protoid: %s\n", i_port,
 967                                 tcm_loop_dump_proto_id(tl_hba));
 968                         return -EINVAL;
 969                 }
 970                 port_ptr = &i_port[0];
 971                 goto check_newline;
 972         }
 973         pr_err("Unable to locate prefix for emulated Initiator Port:"
 974                         " %s\n", i_port);
 975         return -EINVAL;
 976         /*
 977          * Clear any trailing newline for the NAA WWN
 978          */
 979 check_newline:
 980         if (i_port[strlen(i_port)-1] == '\n')
 981                 i_port[strlen(i_port)-1] = '\0';
 982
 983         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 984         if (ret < 0)
 985                 return ret;
 986
 987         return count;
 988 }
 989
 990 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 991                 char *page)
 992 {
 993         struct se_portal_group *se_tpg = to_tpg(item);
 994         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 995                         struct tcm_loop_tpg, tl_se_tpg);
 996         const char *status = NULL;
 997         ssize_t ret = -EINVAL;
 998
 999         switch (tl_tpg->tl_transport_status) {
1000         case TCM_TRANSPORT_ONLINE:
1001                 status = "online";
1002                 break;
1003         case TCM_TRANSPORT_OFFLINE:
1004                 status = "offline";
1005                 break;
1006         default:
1007                 break;
1008         }
1009
1010         if (status)
1011                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1012
1013         return ret;
1014 }
1015
1016 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
1017                 const char *page, size_t count)
1018 {
1019         struct se_portal_group *se_tpg = to_tpg(item);
1020         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1021                         struct tcm_loop_tpg, tl_se_tpg);
1022
1023         if (!strncmp(page, "online", 6)) {
1024                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1025                 return count;
1026         }
1027         if (!strncmp(page, "offline", 7)) {
1028                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1029                 if (tl_tpg->tl_nexus) {
1030                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
1031
1032                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
1033                 }
1034                 return count;
1035         }
1036         return -EINVAL;
1037 }
1038
1039 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
1040 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
1041
1042 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1043         &tcm_loop_tpg_attr_nexus,
1044         &tcm_loop_tpg_attr_transport_status,
1045         NULL,
1046 };
1047
1048 /* Start items for tcm_loop_naa_cit */
1049
1050 static struct se_portal_group *tcm_loop_make_naa_tpg(
1051         struct se_wwn *wwn,
1052         struct config_group *group,
1053         const char *name)
1054 {
1055         struct tcm_loop_hba *tl_hba = container_of(wwn,
1056                         struct tcm_loop_hba, tl_hba_wwn);
1057         struct tcm_loop_tpg *tl_tpg;
1058         int ret;
1059         unsigned long tpgt;
1060
1061         if (strstr(name, "tpgt_") != name) {
1062                 pr_err("Unable to locate \"tpgt_#\" directory"
1063                                 " group\n");
1064                 return ERR_PTR(-EINVAL);
1065         }
1066         if (kstrtoul(name+5, 10, &tpgt))
1067                 return ERR_PTR(-EINVAL);
1068
1069         if (tpgt >= TL_TPGS_PER_HBA) {
1070                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
1071                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
1072                 return ERR_PTR(-EINVAL);
1073         }
1074         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1075         tl_tpg->tl_hba = tl_hba;
1076         tl_tpg->tl_tpgt = tpgt;
1077         /*
1078          * Register the tl_tpg as a emulated TCM Target Endpoint
1079          */
1080         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1081         if (ret < 0)
1082                 return ERR_PTR(-ENOMEM);
1083
1084         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1085                 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
1086                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1087
1088         return &tl_tpg->tl_se_tpg;
1089 }
1090
1091 static void tcm_loop_drop_naa_tpg(
1092         struct se_portal_group *se_tpg)
1093 {
1094         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1095         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1096                                 struct tcm_loop_tpg, tl_se_tpg);
1097         struct tcm_loop_hba *tl_hba;
1098         unsigned short tpgt;
1099
1100         tl_hba = tl_tpg->tl_hba;
1101         tpgt = tl_tpg->tl_tpgt;
1102         /*
1103          * Release the I_T Nexus for the Virtual target link if present
1104          */
1105         tcm_loop_drop_nexus(tl_tpg);
1106         /*
1107          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1108          */
1109         core_tpg_deregister(se_tpg);
1110
1111         tl_tpg->tl_hba = NULL;
1112         tl_tpg->tl_tpgt = 0;
1113
1114         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1115                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1116                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1117 }
1118
1119 /* End items for tcm_loop_naa_cit */
1120
1121 /* Start items for tcm_loop_cit */
1122
1123 static struct se_wwn *tcm_loop_make_scsi_hba(
1124         struct target_fabric_configfs *tf,
1125         struct config_group *group,
1126         const char *name)
1127 {
1128         struct tcm_loop_hba *tl_hba;
1129         struct Scsi_Host *sh;
1130         char *ptr;
1131         int ret, off = 0;
1132
1133         tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1134         if (!tl_hba) {
1135                 pr_err("Unable to allocate struct tcm_loop_hba\n");
1136                 return ERR_PTR(-ENOMEM);
1137         }
1138         /*
1139          * Determine the emulated Protocol Identifier and Target Port Name
1140          * based on the incoming configfs directory name.
1141          */
1142         ptr = strstr(name, "naa.");
1143         if (ptr) {
1144                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1145                 goto check_len;
1146         }
1147         ptr = strstr(name, "fc.");
1148         if (ptr) {
1149                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1150                 off = 3; /* Skip over "fc." */
1151                 goto check_len;
1152         }
1153         ptr = strstr(name, "iqn.");
1154         if (!ptr) {
1155                 pr_err("Unable to locate prefix for emulated Target "
1156                                 "Port: %s\n", name);
1157                 ret = -EINVAL;
1158                 goto out;
1159         }
1160         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1161
1162 check_len:
1163         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1164                 pr_err("Emulated NAA %s Address: %s, exceeds"
1165                         " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1166                         TL_WWN_ADDR_LEN);
1167                 ret = -EINVAL;
1168                 goto out;
1169         }
1170         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1171
1172         /*
1173          * Call device_register(tl_hba->dev) to register the emulated
1174          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1175          * device_register() callbacks in tcm_loop_driver_probe()
1176          */
1177         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1178         if (ret)
1179                 goto out;
1180
1181         sh = tl_hba->sh;
1182         tcm_loop_hba_no_cnt++;
1183         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1184                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1185                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1186
1187         return &tl_hba->tl_hba_wwn;
1188 out:
1189         kfree(tl_hba);
1190         return ERR_PTR(ret);
1191 }
1192
1193 static void tcm_loop_drop_scsi_hba(
1194         struct se_wwn *wwn)
1195 {
1196         struct tcm_loop_hba *tl_hba = container_of(wwn,
1197                                 struct tcm_loop_hba, tl_hba_wwn);
1198
1199         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1200                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1201                 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1202                 tl_hba->sh->host_no);
1203         /*
1204          * Call device_unregister() on the original tl_hba->dev.
1205          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1206          * release *tl_hba;
1207          */
1208         device_unregister(&tl_hba->dev);
1209 }
1210
1211 /* Start items for tcm_loop_cit */
1212 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1213 {
1214         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1215 }
1216
1217 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1218
1219 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1220         &tcm_loop_wwn_attr_version,
1221         NULL,
1222 };
1223
1224 /* End items for tcm_loop_cit */
1225
1226 static const struct target_core_fabric_ops loop_ops = {
1227         .module                         = THIS_MODULE,
1228         .name                           = "loopback",
1229         .get_fabric_name                = tcm_loop_get_fabric_name,
1230         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1231         .tpg_get_tag                    = tcm_loop_get_tag,
1232         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1233         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1234         .tpg_check_demo_mode_write_protect =
1235                                 tcm_loop_check_demo_mode_write_protect,
1236         .tpg_check_prod_mode_write_protect =
1237                                 tcm_loop_check_prod_mode_write_protect,
1238         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1239         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1240         .check_stop_free                = tcm_loop_check_stop_free,
1241         .release_cmd                    = tcm_loop_release_cmd,
1242         .shutdown_session               = tcm_loop_shutdown_session,
1243         .close_session                  = tcm_loop_close_session,
1244         .sess_get_index                 = tcm_loop_sess_get_index,
1245         .write_pending                  = tcm_loop_write_pending,
1246         .write_pending_status           = tcm_loop_write_pending_status,
1247         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1248         .get_cmd_state                  = tcm_loop_get_cmd_state,
1249         .queue_data_in                  = tcm_loop_queue_data_in,
1250         .queue_status                   = tcm_loop_queue_status,
1251         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1252         .aborted_task                   = tcm_loop_aborted_task,
1253         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1254         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1255         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1256         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1257         .fabric_post_link               = tcm_loop_port_link,
1258         .fabric_pre_unlink              = tcm_loop_port_unlink,
1259         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1260         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1261         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1262 };
1263
1264 static int __init tcm_loop_fabric_init(void)
1265 {
1266         int ret = -ENOMEM;
1267
1268         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1269         if (!tcm_loop_workqueue)
1270                 goto out;
1271
1272         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1273                                 sizeof(struct tcm_loop_cmd),
1274                                 __alignof__(struct tcm_loop_cmd),
1275                                 0, NULL);
1276         if (!tcm_loop_cmd_cache) {
1277                 pr_debug("kmem_cache_create() for"
1278                         " tcm_loop_cmd_cache failed\n");
1279                 goto out_destroy_workqueue;
1280         }
1281
1282         ret = tcm_loop_alloc_core_bus();
1283         if (ret)
1284                 goto out_destroy_cache;
1285
1286         ret = target_register_template(&loop_ops);
1287         if (ret)
1288                 goto out_release_core_bus;
1289
1290         return 0;
1291
1292 out_release_core_bus:
1293         tcm_loop_release_core_bus();
1294 out_destroy_cache:
1295         kmem_cache_destroy(tcm_loop_cmd_cache);
1296 out_destroy_workqueue:
1297         destroy_workqueue(tcm_loop_workqueue);
1298 out:
1299         return ret;
1300 }
1301
1302 static void __exit tcm_loop_fabric_exit(void)
1303 {
1304         target_unregister_template(&loop_ops);
1305         tcm_loop_release_core_bus();
1306         kmem_cache_destroy(tcm_loop_cmd_cache);
1307         destroy_workqueue(tcm_loop_workqueue);
1308 }
1309
1310 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1311 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1312 MODULE_LICENSE("GPL");
1313 module_init(tcm_loop_fabric_init);
1314 module_exit(tcm_loop_fabric_exit);