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 #include <target/target_core_fabric_configfs.h>
  38
  39 #include "tcm_loop.h"
  40
  41 #define to_tcm_loop_hba(hba)    container_of(hba, struct tcm_loop_hba, dev)
  42
  43 static struct workqueue_struct *tcm_loop_workqueue;
  44 static struct kmem_cache *tcm_loop_cmd_cache;
  45
  46 static int tcm_loop_hba_no_cnt;
  47
  48 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
  49
  50 /*
  51  * Called from struct target_core_fabric_ops->check_stop_free()
  52  */
  53 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
  54 {
  55         /*
  56          * Do not release struct se_cmd's containing a valid TMR
  57          * pointer.  These will be released directly in tcm_loop_device_reset()
  58          * with transport_generic_free_cmd().
  59          */
  60         if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
  61                 return 0;
  62         /*
  63          * Release the struct se_cmd, which will make a callback to release
  64          * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
  65          */
  66         transport_generic_free_cmd(se_cmd, 0);
  67         return 1;
  68 }
  69
  70 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
  71 {
  72         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
  73                                 struct tcm_loop_cmd, tl_se_cmd);
  74
  75         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
  76 }
  77
  78 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
  79 {
  80         seq_printf(m, "tcm_loop_proc_info()\n");
  81         return 0;
  82 }
  83
  84 static int tcm_loop_driver_probe(struct device *);
  85 static int tcm_loop_driver_remove(struct device *);
  86
  87 static int pseudo_lld_bus_match(struct device *dev,
  88                                 struct device_driver *dev_driver)
  89 {
  90         return 1;
  91 }
  92
  93 static struct bus_type tcm_loop_lld_bus = {
  94         .name                   = "tcm_loop_bus",
  95         .match                  = pseudo_lld_bus_match,
  96         .probe                  = tcm_loop_driver_probe,
  97         .remove                 = tcm_loop_driver_remove,
  98 };
  99
 100 static struct device_driver tcm_loop_driverfs = {
 101         .name                   = "tcm_loop",
 102         .bus                    = &tcm_loop_lld_bus,
 103 };
 104 /*
 105  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
 106  */
 107 static struct device *tcm_loop_primary;
 108
 109 static void tcm_loop_submission_work(struct work_struct *work)
 110 {
 111         struct tcm_loop_cmd *tl_cmd =
 112                 container_of(work, struct tcm_loop_cmd, work);
 113         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
 114         struct scsi_cmnd *sc = tl_cmd->sc;
 115         struct tcm_loop_nexus *tl_nexus;
 116         struct tcm_loop_hba *tl_hba;
 117         struct tcm_loop_tpg *tl_tpg;
 118         struct scatterlist *sgl_bidi = NULL;
 119         u32 sgl_bidi_count = 0, transfer_length;
 120         int rc;
 121
 122         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 123         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 124
 125         /*
 126          * Ensure that this tl_tpg reference from the incoming sc->device->id
 127          * has already been configured via tcm_loop_make_naa_tpg().
 128          */
 129         if (!tl_tpg->tl_hba) {
 130                 set_host_byte(sc, DID_NO_CONNECT);
 131                 goto out_done;
 132         }
 133         if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
 134                 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 135                 goto out_done;
 136         }
 137         tl_nexus = tl_tpg->tl_nexus;
 138         if (!tl_nexus) {
 139                 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
 140                                 " does not exist\n");
 141                 set_host_byte(sc, DID_ERROR);
 142                 goto out_done;
 143         }
 144         if (scsi_bidi_cmnd(sc)) {
 145                 struct scsi_data_buffer *sdb = scsi_in(sc);
 146
 147                 sgl_bidi = sdb->table.sgl;
 148                 sgl_bidi_count = sdb->table.nents;
 149                 se_cmd->se_cmd_flags |= SCF_BIDI;
 150
 151         }
 152
 153         transfer_length = scsi_transfer_length(sc);
 154         if (!scsi_prot_sg_count(sc) &&
 155             scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
 156                 se_cmd->prot_pto = true;
 157                 /*
 158                  * loopback transport doesn't support
 159                  * WRITE_GENERATE, READ_STRIP protection
 160                  * information operations, go ahead unprotected.
 161                  */
 162                 transfer_length = scsi_bufflen(sc);
 163         }
 164
 165         se_cmd->tag = tl_cmd->sc_cmd_tag;
 166         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
 167                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
 168                         transfer_length, TCM_SIMPLE_TAG,
 169                         sc->sc_data_direction, 0,
 170                         scsi_sglist(sc), scsi_sg_count(sc),
 171                         sgl_bidi, sgl_bidi_count,
 172                         scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
 173         if (rc < 0) {
 174                 set_host_byte(sc, DID_NO_CONNECT);
 175                 goto out_done;
 176         }
 177         return;
 178
 179 out_done:
 180         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 181         sc->scsi_done(sc);
 182         return;
 183 }
 184
 185 /*
 186  * ->queuecommand can be and usually is called from interrupt context, so
 187  * defer the actual submission to a workqueue.
 188  */
 189 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
 190 {
 191         struct tcm_loop_cmd *tl_cmd;
 192
 193         pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
 194                 " scsi_buf_len: %u\n", sc->device->host->host_no,
 195                 sc->device->id, sc->device->channel, sc->device->lun,
 196                 sc->cmnd[0], scsi_bufflen(sc));
 197
 198         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
 199         if (!tl_cmd) {
 200                 pr_err("Unable to allocate struct tcm_loop_cmd\n");
 201                 set_host_byte(sc, DID_ERROR);
 202                 sc->scsi_done(sc);
 203                 return 0;
 204         }
 205
 206         tl_cmd->sc = sc;
 207         tl_cmd->sc_cmd_tag = sc->request->tag;
 208         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
 209         queue_work(tcm_loop_workqueue, &tl_cmd->work);
 210         return 0;
 211 }
 212
 213 /*
 214  * Called from SCSI EH process context to issue a LUN_RESET TMR
 215  * to struct scsi_device
 216  */
 217 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 218                               u64 lun, int task, enum tcm_tmreq_table tmr)
 219 {
 220         struct se_cmd *se_cmd = NULL;
 221         struct se_session *se_sess;
 222         struct se_portal_group *se_tpg;
 223         struct tcm_loop_nexus *tl_nexus;
 224         struct tcm_loop_cmd *tl_cmd = NULL;
 225         struct tcm_loop_tmr *tl_tmr = NULL;
 226         int ret = TMR_FUNCTION_FAILED, rc;
 227
 228         /*
 229          * Locate the tl_nexus and se_sess pointers
 230          */
 231         tl_nexus = tl_tpg->tl_nexus;
 232         if (!tl_nexus) {
 233                 pr_err("Unable to perform device reset without"
 234                                 " active I_T Nexus\n");
 235                 return ret;
 236         }
 237
 238         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 239         if (!tl_cmd) {
 240                 pr_err("Unable to allocate memory for tl_cmd\n");
 241                 return ret;
 242         }
 243
 244         tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
 245         if (!tl_tmr) {
 246                 pr_err("Unable to allocate memory for tl_tmr\n");
 247                 goto release;
 248         }
 249         init_waitqueue_head(&tl_tmr->tl_tmr_wait);
 250
 251         se_cmd = &tl_cmd->tl_se_cmd;
 252         se_tpg = &tl_tpg->tl_se_tpg;
 253         se_sess = tl_tpg->tl_nexus->se_sess;
 254         /*
 255          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 256          */
 257         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
 258                                 DMA_NONE, TCM_SIMPLE_TAG,
 259                                 &tl_cmd->tl_sense_buf[0]);
 260
 261         rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
 262         if (rc < 0)
 263                 goto release;
 264
 265         if (tmr == TMR_ABORT_TASK)
 266                 se_cmd->se_tmr_req->ref_task_tag = task;
 267
 268         /*
 269          * Locate the underlying TCM struct se_lun
 270          */
 271         if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
 272                 ret = TMR_LUN_DOES_NOT_EXIST;
 273                 goto release;
 274         }
 275         /*
 276          * Queue the TMR to TCM Core and sleep waiting for
 277          * tcm_loop_queue_tm_rsp() to wake us up.
 278          */
 279         transport_generic_handle_tmr(se_cmd);
 280         wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
 281         /*
 282          * The TMR LUN_RESET has completed, check the response status and
 283          * then release allocations.
 284          */
 285         ret = se_cmd->se_tmr_req->response;
 286 release:
 287         if (se_cmd)
 288                 transport_generic_free_cmd(se_cmd, 1);
 289         else
 290                 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 291         kfree(tl_tmr);
 292         return ret;
 293 }
 294
 295 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 296 {
 297         struct tcm_loop_hba *tl_hba;
 298         struct tcm_loop_tpg *tl_tpg;
 299         int ret = FAILED;
 300
 301         /*
 302          * Locate the tcm_loop_hba_t pointer
 303          */
 304         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 305         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 306         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 307                                  sc->request->tag, TMR_ABORT_TASK);
 308         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 309 }
 310
 311 /*
 312  * Called from SCSI EH process context to issue a LUN_RESET TMR
 313  * to struct scsi_device
 314  */
 315 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 316 {
 317         struct tcm_loop_hba *tl_hba;
 318         struct tcm_loop_tpg *tl_tpg;
 319         int ret = FAILED;
 320
 321         /*
 322          * Locate the tcm_loop_hba_t pointer
 323          */
 324         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 325         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 326
 327         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 328                                  0, TMR_LUN_RESET);
 329         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 330 }
 331
 332 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 333 {
 334         struct tcm_loop_hba *tl_hba;
 335         struct tcm_loop_tpg *tl_tpg;
 336
 337         /*
 338          * Locate the tcm_loop_hba_t pointer
 339          */
 340         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 341         if (!tl_hba) {
 342                 pr_err("Unable to perform device reset without"
 343                                 " active I_T Nexus\n");
 344                 return FAILED;
 345         }
 346         /*
 347          * Locate the tl_tpg pointer from TargetID in sc->device->id
 348          */
 349         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 350         if (tl_tpg) {
 351                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 352                 return SUCCESS;
 353         }
 354         return FAILED;
 355 }
 356
 357 static int tcm_loop_slave_alloc(struct scsi_device *sd)
 358 {
 359         set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
 360         return 0;
 361 }
 362
 363 static struct scsi_host_template tcm_loop_driver_template = {
 364         .show_info              = tcm_loop_show_info,
 365         .proc_name              = "tcm_loopback",
 366         .name                   = "TCM_Loopback",
 367         .queuecommand           = tcm_loop_queuecommand,
 368         .change_queue_depth     = scsi_change_queue_depth,
 369         .eh_abort_handler = tcm_loop_abort_task,
 370         .eh_device_reset_handler = tcm_loop_device_reset,
 371         .eh_target_reset_handler = tcm_loop_target_reset,
 372         .can_queue              = 1024,
 373         .this_id                = -1,
 374         .sg_tablesize           = 256,
 375         .cmd_per_lun            = 1024,
 376         .max_sectors            = 0xFFFF,
 377         .use_clustering         = DISABLE_CLUSTERING,
 378         .slave_alloc            = tcm_loop_slave_alloc,
 379         .module                 = THIS_MODULE,
 380         .use_blk_tags           = 1,
 381         .track_queue_depth      = 1,
 382 };
 383
 384 static int tcm_loop_driver_probe(struct device *dev)
 385 {
 386         struct tcm_loop_hba *tl_hba;
 387         struct Scsi_Host *sh;
 388         int error, host_prot;
 389
 390         tl_hba = to_tcm_loop_hba(dev);
 391
 392         sh = scsi_host_alloc(&tcm_loop_driver_template,
 393                         sizeof(struct tcm_loop_hba));
 394         if (!sh) {
 395                 pr_err("Unable to allocate struct scsi_host\n");
 396                 return -ENODEV;
 397         }
 398         tl_hba->sh = sh;
 399
 400         /*
 401          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 402          */
 403         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 404         /*
 405          * Setup single ID, Channel and LUN for now..
 406          */
 407         sh->max_id = 2;
 408         sh->max_lun = 0;
 409         sh->max_channel = 0;
 410         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 411
 412         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 413                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 414                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 415
 416         scsi_host_set_prot(sh, host_prot);
 417         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 418
 419         error = scsi_add_host(sh, &tl_hba->dev);
 420         if (error) {
 421                 pr_err("%s: scsi_add_host failed\n", __func__);
 422                 scsi_host_put(sh);
 423                 return -ENODEV;
 424         }
 425         return 0;
 426 }
 427
 428 static int tcm_loop_driver_remove(struct device *dev)
 429 {
 430         struct tcm_loop_hba *tl_hba;
 431         struct Scsi_Host *sh;
 432
 433         tl_hba = to_tcm_loop_hba(dev);
 434         sh = tl_hba->sh;
 435
 436         scsi_remove_host(sh);
 437         scsi_host_put(sh);
 438         return 0;
 439 }
 440
 441 static void tcm_loop_release_adapter(struct device *dev)
 442 {
 443         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 444
 445         kfree(tl_hba);
 446 }
 447
 448 /*
 449  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 450  */
 451 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 452 {
 453         int ret;
 454
 455         tl_hba->dev.bus = &tcm_loop_lld_bus;
 456         tl_hba->dev.parent = tcm_loop_primary;
 457         tl_hba->dev.release = &tcm_loop_release_adapter;
 458         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 459
 460         ret = device_register(&tl_hba->dev);
 461         if (ret) {
 462                 pr_err("device_register() failed for"
 463                                 " tl_hba->dev: %d\n", ret);
 464                 return -ENODEV;
 465         }
 466
 467         return 0;
 468 }
 469
 470 /*
 471  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 472  * tcm_loop SCSI bus.
 473  */
 474 static int tcm_loop_alloc_core_bus(void)
 475 {
 476         int ret;
 477
 478         tcm_loop_primary = root_device_register("tcm_loop_0");
 479         if (IS_ERR(tcm_loop_primary)) {
 480                 pr_err("Unable to allocate tcm_loop_primary\n");
 481                 return PTR_ERR(tcm_loop_primary);
 482         }
 483
 484         ret = bus_register(&tcm_loop_lld_bus);
 485         if (ret) {
 486                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 487                 goto dev_unreg;
 488         }
 489
 490         ret = driver_register(&tcm_loop_driverfs);
 491         if (ret) {
 492                 pr_err("driver_register() failed for"
 493                                 "tcm_loop_driverfs\n");
 494                 goto bus_unreg;
 495         }
 496
 497         pr_debug("Initialized TCM Loop Core Bus\n");
 498         return ret;
 499
 500 bus_unreg:
 501         bus_unregister(&tcm_loop_lld_bus);
 502 dev_unreg:
 503         root_device_unregister(tcm_loop_primary);
 504         return ret;
 505 }
 506
 507 static void tcm_loop_release_core_bus(void)
 508 {
 509         driver_unregister(&tcm_loop_driverfs);
 510         bus_unregister(&tcm_loop_lld_bus);
 511         root_device_unregister(tcm_loop_primary);
 512
 513         pr_debug("Releasing TCM Loop Core BUS\n");
 514 }
 515
 516 static char *tcm_loop_get_fabric_name(void)
 517 {
 518         return "loopback";
 519 }
 520
 521 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 522 {
 523         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 524 }
 525
 526 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 527 {
 528         /*
 529          * Return the passed NAA identifier for the Target Port
 530          */
 531         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 532 }
 533
 534 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 535 {
 536         /*
 537          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 538          * to represent the SCSI Target Port.
 539          */
 540         return tl_tpg(se_tpg)->tl_tpgt;
 541 }
 542
 543 /*
 544  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 545  * based upon the incoming fabric dependent SCSI Initiator Port
 546  */
 547 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 548 {
 549         return 1;
 550 }
 551
 552 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 553 {
 554         return 0;
 555 }
 556
 557 /*
 558  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 559  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 560  */
 561 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 562 {
 563         return 0;
 564 }
 565
 566 /*
 567  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 568  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 569  * It has been added here as a nop for target_fabric_tf_ops_check()
 570  */
 571 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 572 {
 573         return 0;
 574 }
 575
 576 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 577 {
 578         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 579                                                    tl_se_tpg);
 580         return tl_tpg->tl_fabric_prot_type;
 581 }
 582
 583 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 584 {
 585         return 1;
 586 }
 587
 588 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 589 {
 590         return 1;
 591 }
 592
 593 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 594 {
 595         return;
 596 }
 597
 598 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 599 {
 600         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 601                         struct tcm_loop_cmd, tl_se_cmd);
 602
 603         return tl_cmd->sc_cmd_state;
 604 }
 605
 606 static int tcm_loop_shutdown_session(struct se_session *se_sess)
 607 {
 608         return 0;
 609 }
 610
 611 static void tcm_loop_close_session(struct se_session *se_sess)
 612 {
 613         return;
 614 };
 615
 616 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 617 {
 618         /*
 619          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 620          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 621          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 622          * format with transport_generic_map_mem_to_cmd().
 623          *
 624          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 625          * object execution queue.
 626          */
 627         target_execute_cmd(se_cmd);
 628         return 0;
 629 }
 630
 631 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 632 {
 633         return 0;
 634 }
 635
 636 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 637 {
 638         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 639                                 struct tcm_loop_cmd, tl_se_cmd);
 640         struct scsi_cmnd *sc = tl_cmd->sc;
 641
 642         pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
 643                      " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 644
 645         sc->result = SAM_STAT_GOOD;
 646         set_host_byte(sc, DID_OK);
 647         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 648             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 649                 scsi_set_resid(sc, se_cmd->residual_count);
 650         sc->scsi_done(sc);
 651         return 0;
 652 }
 653
 654 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 655 {
 656         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 657                                 struct tcm_loop_cmd, tl_se_cmd);
 658         struct scsi_cmnd *sc = tl_cmd->sc;
 659
 660         pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
 661                         " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 662
 663         if (se_cmd->sense_buffer &&
 664            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 665             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 666
 667                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 668                                 SCSI_SENSE_BUFFERSIZE);
 669                 sc->result = SAM_STAT_CHECK_CONDITION;
 670                 set_driver_byte(sc, DRIVER_SENSE);
 671         } else
 672                 sc->result = se_cmd->scsi_status;
 673
 674         set_host_byte(sc, DID_OK);
 675         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 676             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 677                 scsi_set_resid(sc, se_cmd->residual_count);
 678         sc->scsi_done(sc);
 679         return 0;
 680 }
 681
 682 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 683 {
 684         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 685         struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
 686         /*
 687          * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
 688          * and wake up the wait_queue_head_t in tcm_loop_device_reset()
 689          */
 690         atomic_set(&tl_tmr->tmr_complete, 1);
 691         wake_up(&tl_tmr->tl_tmr_wait);
 692 }
 693
 694 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 695 {
 696         return;
 697 }
 698
 699 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 700 {
 701         switch (tl_hba->tl_proto_id) {
 702         case SCSI_PROTOCOL_SAS:
 703                 return "SAS";
 704         case SCSI_PROTOCOL_FCP:
 705                 return "FCP";
 706         case SCSI_PROTOCOL_ISCSI:
 707                 return "iSCSI";
 708         default:
 709                 break;
 710         }
 711
 712         return "Unknown";
 713 }
 714
 715 /* Start items for tcm_loop_port_cit */
 716
 717 static int tcm_loop_port_link(
 718         struct se_portal_group *se_tpg,
 719         struct se_lun *lun)
 720 {
 721         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 722                                 struct tcm_loop_tpg, tl_se_tpg);
 723         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 724
 725         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 726         /*
 727          * Add Linux/SCSI struct scsi_device by HCTL
 728          */
 729         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 730
 731         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 732         return 0;
 733 }
 734
 735 static void tcm_loop_port_unlink(
 736         struct se_portal_group *se_tpg,
 737         struct se_lun *se_lun)
 738 {
 739         struct scsi_device *sd;
 740         struct tcm_loop_hba *tl_hba;
 741         struct tcm_loop_tpg *tl_tpg;
 742
 743         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 744         tl_hba = tl_tpg->tl_hba;
 745
 746         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 747                                 se_lun->unpacked_lun);
 748         if (!sd) {
 749                 pr_err("Unable to locate struct scsi_device for %d:%d:"
 750                         "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 751                 return;
 752         }
 753         /*
 754          * Remove Linux/SCSI struct scsi_device by HCTL
 755          */
 756         scsi_remove_device(sd);
 757         scsi_device_put(sd);
 758
 759         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 760
 761         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 762 }
 763
 764 /* End items for tcm_loop_port_cit */
 765
 766 static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type(
 767         struct se_portal_group *se_tpg,
 768         char *page)
 769 {
 770         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 771                                                    tl_se_tpg);
 772
 773         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 774 }
 775
 776 static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type(
 777         struct se_portal_group *se_tpg,
 778         const char *page,
 779         size_t count)
 780 {
 781         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 782                                                    tl_se_tpg);
 783         unsigned long val;
 784         int ret = kstrtoul(page, 0, &val);
 785
 786         if (ret) {
 787                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 788                 return ret;
 789         }
 790         if (val != 0 && val != 1 && val != 3) {
 791                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 792                 return -EINVAL;
 793         }
 794         tl_tpg->tl_fabric_prot_type = val;
 795
 796         return count;
 797 }
 798
 799 TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR);
 800
 801 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 802         &tcm_loop_tpg_attrib_fabric_prot_type.attr,
 803         NULL,
 804 };
 805
 806 /* Start items for tcm_loop_nexus_cit */
 807
 808 static int tcm_loop_make_nexus(
 809         struct tcm_loop_tpg *tl_tpg,
 810         const char *name)
 811 {
 812         struct se_portal_group *se_tpg;
 813         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 814         struct tcm_loop_nexus *tl_nexus;
 815         int ret = -ENOMEM;
 816
 817         if (tl_tpg->tl_nexus) {
 818                 pr_debug("tl_tpg->tl_nexus already exists\n");
 819                 return -EEXIST;
 820         }
 821         se_tpg = &tl_tpg->tl_se_tpg;
 822
 823         tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
 824         if (!tl_nexus) {
 825                 pr_err("Unable to allocate struct tcm_loop_nexus\n");
 826                 return -ENOMEM;
 827         }
 828         /*
 829          * Initialize the struct se_session pointer
 830          */
 831         tl_nexus->se_sess = transport_init_session(
 832                                 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
 833         if (IS_ERR(tl_nexus->se_sess)) {
 834                 ret = PTR_ERR(tl_nexus->se_sess);
 835                 goto out;
 836         }
 837         /*
 838          * Since we are running in 'demo mode' this call with generate a
 839          * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
 840          * Initiator port name of the passed configfs group 'name'.
 841          */
 842         tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
 843                                 se_tpg, (unsigned char *)name);
 844         if (!tl_nexus->se_sess->se_node_acl) {
 845                 transport_free_session(tl_nexus->se_sess);
 846                 goto out;
 847         }
 848         /* Now, register the I_T Nexus as active. */
 849         transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
 850                         tl_nexus->se_sess, tl_nexus);
 851         tl_tpg->tl_nexus = tl_nexus;
 852         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
 853                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
 854                 name);
 855         return 0;
 856
 857 out:
 858         kfree(tl_nexus);
 859         return ret;
 860 }
 861
 862 static int tcm_loop_drop_nexus(
 863         struct tcm_loop_tpg *tpg)
 864 {
 865         struct se_session *se_sess;
 866         struct tcm_loop_nexus *tl_nexus;
 867
 868         tl_nexus = tpg->tl_nexus;
 869         if (!tl_nexus)
 870                 return -ENODEV;
 871
 872         se_sess = tl_nexus->se_sess;
 873         if (!se_sess)
 874                 return -ENODEV;
 875
 876         if (atomic_read(&tpg->tl_tpg_port_count)) {
 877                 pr_err("Unable to remove TCM_Loop I_T Nexus with"
 878                         " active TPG port count: %d\n",
 879                         atomic_read(&tpg->tl_tpg_port_count));
 880                 return -EPERM;
 881         }
 882
 883         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
 884                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
 885                 tl_nexus->se_sess->se_node_acl->initiatorname);
 886         /*
 887          * Release the SCSI I_T Nexus to the emulated Target Port
 888          */
 889         transport_deregister_session(tl_nexus->se_sess);
 890         tpg->tl_nexus = NULL;
 891         kfree(tl_nexus);
 892         return 0;
 893 }
 894
 895 /* End items for tcm_loop_nexus_cit */
 896
 897 static ssize_t tcm_loop_tpg_show_nexus(
 898         struct se_portal_group *se_tpg,
 899         char *page)
 900 {
 901         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 902                         struct tcm_loop_tpg, tl_se_tpg);
 903         struct tcm_loop_nexus *tl_nexus;
 904         ssize_t ret;
 905
 906         tl_nexus = tl_tpg->tl_nexus;
 907         if (!tl_nexus)
 908                 return -ENODEV;
 909
 910         ret = snprintf(page, PAGE_SIZE, "%s\n",
 911                 tl_nexus->se_sess->se_node_acl->initiatorname);
 912
 913         return ret;
 914 }
 915
 916 static ssize_t tcm_loop_tpg_store_nexus(
 917         struct se_portal_group *se_tpg,
 918         const char *page,
 919         size_t count)
 920 {
 921         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 922                         struct tcm_loop_tpg, tl_se_tpg);
 923         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 924         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 925         int ret;
 926         /*
 927          * Shutdown the active I_T nexus if 'NULL' is passed..
 928          */
 929         if (!strncmp(page, "NULL", 4)) {
 930                 ret = tcm_loop_drop_nexus(tl_tpg);
 931                 return (!ret) ? count : ret;
 932         }
 933         /*
 934          * Otherwise make sure the passed virtual Initiator port WWN matches
 935          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 936          * tcm_loop_make_nexus()
 937          */
 938         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 939                 pr_err("Emulated NAA Sas Address: %s, exceeds"
 940                                 " max: %d\n", page, TL_WWN_ADDR_LEN);
 941                 return -EINVAL;
 942         }
 943         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 944
 945         ptr = strstr(i_port, "naa.");
 946         if (ptr) {
 947                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 948                         pr_err("Passed SAS Initiator Port %s does not"
 949                                 " match target port protoid: %s\n", i_port,
 950                                 tcm_loop_dump_proto_id(tl_hba));
 951                         return -EINVAL;
 952                 }
 953                 port_ptr = &i_port[0];
 954                 goto check_newline;
 955         }
 956         ptr = strstr(i_port, "fc.");
 957         if (ptr) {
 958                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 959                         pr_err("Passed FCP Initiator Port %s does not"
 960                                 " match target port protoid: %s\n", i_port,
 961                                 tcm_loop_dump_proto_id(tl_hba));
 962                         return -EINVAL;
 963                 }
 964                 port_ptr = &i_port[3]; /* Skip over "fc." */
 965                 goto check_newline;
 966         }
 967         ptr = strstr(i_port, "iqn.");
 968         if (ptr) {
 969                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 970                         pr_err("Passed iSCSI Initiator Port %s does not"
 971                                 " match target port protoid: %s\n", i_port,
 972                                 tcm_loop_dump_proto_id(tl_hba));
 973                         return -EINVAL;
 974                 }
 975                 port_ptr = &i_port[0];
 976                 goto check_newline;
 977         }
 978         pr_err("Unable to locate prefix for emulated Initiator Port:"
 979                         " %s\n", i_port);
 980         return -EINVAL;
 981         /*
 982          * Clear any trailing newline for the NAA WWN
 983          */
 984 check_newline:
 985         if (i_port[strlen(i_port)-1] == '\n')
 986                 i_port[strlen(i_port)-1] = '\0';
 987
 988         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 989         if (ret < 0)
 990                 return ret;
 991
 992         return count;
 993 }
 994
 995 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
 996
 997 static ssize_t tcm_loop_tpg_show_transport_status(
 998         struct se_portal_group *se_tpg,
 999         char *page)
1000 {
1001         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1002                         struct tcm_loop_tpg, tl_se_tpg);
1003         const char *status = NULL;
1004         ssize_t ret = -EINVAL;
1005
1006         switch (tl_tpg->tl_transport_status) {
1007         case TCM_TRANSPORT_ONLINE:
1008                 status = "online";
1009                 break;
1010         case TCM_TRANSPORT_OFFLINE:
1011                 status = "offline";
1012                 break;
1013         default:
1014                 break;
1015         }
1016
1017         if (status)
1018                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1019
1020         return ret;
1021 }
1022
1023 static ssize_t tcm_loop_tpg_store_transport_status(
1024         struct se_portal_group *se_tpg,
1025         const char *page,
1026         size_t count)
1027 {
1028         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1029                         struct tcm_loop_tpg, tl_se_tpg);
1030
1031         if (!strncmp(page, "online", 6)) {
1032                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1033                 return count;
1034         }
1035         if (!strncmp(page, "offline", 7)) {
1036                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1037                 if (tl_tpg->tl_nexus) {
1038                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
1039
1040                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
1041                 }
1042                 return count;
1043         }
1044         return -EINVAL;
1045 }
1046
1047 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1048
1049 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1050         &tcm_loop_tpg_nexus.attr,
1051         &tcm_loop_tpg_transport_status.attr,
1052         NULL,
1053 };
1054
1055 /* Start items for tcm_loop_naa_cit */
1056
1057 static struct se_portal_group *tcm_loop_make_naa_tpg(
1058         struct se_wwn *wwn,
1059         struct config_group *group,
1060         const char *name)
1061 {
1062         struct tcm_loop_hba *tl_hba = container_of(wwn,
1063                         struct tcm_loop_hba, tl_hba_wwn);
1064         struct tcm_loop_tpg *tl_tpg;
1065         int ret;
1066         unsigned long tpgt;
1067
1068         if (strstr(name, "tpgt_") != name) {
1069                 pr_err("Unable to locate \"tpgt_#\" directory"
1070                                 " group\n");
1071                 return ERR_PTR(-EINVAL);
1072         }
1073         if (kstrtoul(name+5, 10, &tpgt))
1074                 return ERR_PTR(-EINVAL);
1075
1076         if (tpgt >= TL_TPGS_PER_HBA) {
1077                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
1078                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
1079                 return ERR_PTR(-EINVAL);
1080         }
1081         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1082         tl_tpg->tl_hba = tl_hba;
1083         tl_tpg->tl_tpgt = tpgt;
1084         /*
1085          * Register the tl_tpg as a emulated TCM Target Endpoint
1086          */
1087         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1088         if (ret < 0)
1089                 return ERR_PTR(-ENOMEM);
1090
1091         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1092                 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
1093                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1094
1095         return &tl_tpg->tl_se_tpg;
1096 }
1097
1098 static void tcm_loop_drop_naa_tpg(
1099         struct se_portal_group *se_tpg)
1100 {
1101         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1102         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1103                                 struct tcm_loop_tpg, tl_se_tpg);
1104         struct tcm_loop_hba *tl_hba;
1105         unsigned short tpgt;
1106
1107         tl_hba = tl_tpg->tl_hba;
1108         tpgt = tl_tpg->tl_tpgt;
1109         /*
1110          * Release the I_T Nexus for the Virtual target link if present
1111          */
1112         tcm_loop_drop_nexus(tl_tpg);
1113         /*
1114          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1115          */
1116         core_tpg_deregister(se_tpg);
1117
1118         tl_tpg->tl_hba = NULL;
1119         tl_tpg->tl_tpgt = 0;
1120
1121         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1122                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1123                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1124 }
1125
1126 /* End items for tcm_loop_naa_cit */
1127
1128 /* Start items for tcm_loop_cit */
1129
1130 static struct se_wwn *tcm_loop_make_scsi_hba(
1131         struct target_fabric_configfs *tf,
1132         struct config_group *group,
1133         const char *name)
1134 {
1135         struct tcm_loop_hba *tl_hba;
1136         struct Scsi_Host *sh;
1137         char *ptr;
1138         int ret, off = 0;
1139
1140         tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1141         if (!tl_hba) {
1142                 pr_err("Unable to allocate struct tcm_loop_hba\n");
1143                 return ERR_PTR(-ENOMEM);
1144         }
1145         /*
1146          * Determine the emulated Protocol Identifier and Target Port Name
1147          * based on the incoming configfs directory name.
1148          */
1149         ptr = strstr(name, "naa.");
1150         if (ptr) {
1151                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1152                 goto check_len;
1153         }
1154         ptr = strstr(name, "fc.");
1155         if (ptr) {
1156                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1157                 off = 3; /* Skip over "fc." */
1158                 goto check_len;
1159         }
1160         ptr = strstr(name, "iqn.");
1161         if (!ptr) {
1162                 pr_err("Unable to locate prefix for emulated Target "
1163                                 "Port: %s\n", name);
1164                 ret = -EINVAL;
1165                 goto out;
1166         }
1167         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1168
1169 check_len:
1170         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1171                 pr_err("Emulated NAA %s Address: %s, exceeds"
1172                         " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1173                         TL_WWN_ADDR_LEN);
1174                 ret = -EINVAL;
1175                 goto out;
1176         }
1177         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1178
1179         /*
1180          * Call device_register(tl_hba->dev) to register the emulated
1181          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1182          * device_register() callbacks in tcm_loop_driver_probe()
1183          */
1184         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1185         if (ret)
1186                 goto out;
1187
1188         sh = tl_hba->sh;
1189         tcm_loop_hba_no_cnt++;
1190         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1191                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1192                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1193
1194         return &tl_hba->tl_hba_wwn;
1195 out:
1196         kfree(tl_hba);
1197         return ERR_PTR(ret);
1198 }
1199
1200 static void tcm_loop_drop_scsi_hba(
1201         struct se_wwn *wwn)
1202 {
1203         struct tcm_loop_hba *tl_hba = container_of(wwn,
1204                                 struct tcm_loop_hba, tl_hba_wwn);
1205
1206         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1207                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1208                 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1209                 tl_hba->sh->host_no);
1210         /*
1211          * Call device_unregister() on the original tl_hba->dev.
1212          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1213          * release *tl_hba;
1214          */
1215         device_unregister(&tl_hba->dev);
1216 }
1217
1218 /* Start items for tcm_loop_cit */
1219 static ssize_t tcm_loop_wwn_show_attr_version(
1220         struct target_fabric_configfs *tf,
1221         char *page)
1222 {
1223         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1224 }
1225
1226 TF_WWN_ATTR_RO(tcm_loop, version);
1227
1228 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1229         &tcm_loop_wwn_version.attr,
1230         NULL,
1231 };
1232
1233 /* End items for tcm_loop_cit */
1234
1235 static const struct target_core_fabric_ops loop_ops = {
1236         .module                         = THIS_MODULE,
1237         .name                           = "loopback",
1238         .get_fabric_name                = tcm_loop_get_fabric_name,
1239         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1240         .tpg_get_tag                    = tcm_loop_get_tag,
1241         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1242         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1243         .tpg_check_demo_mode_write_protect =
1244                                 tcm_loop_check_demo_mode_write_protect,
1245         .tpg_check_prod_mode_write_protect =
1246                                 tcm_loop_check_prod_mode_write_protect,
1247         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1248         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1249         .check_stop_free                = tcm_loop_check_stop_free,
1250         .release_cmd                    = tcm_loop_release_cmd,
1251         .shutdown_session               = tcm_loop_shutdown_session,
1252         .close_session                  = tcm_loop_close_session,
1253         .sess_get_index                 = tcm_loop_sess_get_index,
1254         .write_pending                  = tcm_loop_write_pending,
1255         .write_pending_status           = tcm_loop_write_pending_status,
1256         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1257         .get_cmd_state                  = tcm_loop_get_cmd_state,
1258         .queue_data_in                  = tcm_loop_queue_data_in,
1259         .queue_status                   = tcm_loop_queue_status,
1260         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1261         .aborted_task                   = tcm_loop_aborted_task,
1262         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1263         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1264         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1265         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1266         .fabric_post_link               = tcm_loop_port_link,
1267         .fabric_pre_unlink              = tcm_loop_port_unlink,
1268         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1269         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1270         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1271 };
1272
1273 static int __init tcm_loop_fabric_init(void)
1274 {
1275         int ret = -ENOMEM;
1276
1277         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1278         if (!tcm_loop_workqueue)
1279                 goto out;
1280
1281         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1282                                 sizeof(struct tcm_loop_cmd),
1283                                 __alignof__(struct tcm_loop_cmd),
1284                                 0, NULL);
1285         if (!tcm_loop_cmd_cache) {
1286                 pr_debug("kmem_cache_create() for"
1287                         " tcm_loop_cmd_cache failed\n");
1288                 goto out_destroy_workqueue;
1289         }
1290
1291         ret = tcm_loop_alloc_core_bus();
1292         if (ret)
1293                 goto out_destroy_cache;
1294
1295         ret = target_register_template(&loop_ops);
1296         if (ret)
1297                 goto out_release_core_bus;
1298
1299         return 0;
1300
1301 out_release_core_bus:
1302         tcm_loop_release_core_bus();
1303 out_destroy_cache:
1304         kmem_cache_destroy(tcm_loop_cmd_cache);
1305 out_destroy_workqueue:
1306         destroy_workqueue(tcm_loop_workqueue);
1307 out:
1308         return ret;
1309 }
1310
1311 static void __exit tcm_loop_fabric_exit(void)
1312 {
1313         target_unregister_template(&loop_ops);
1314         tcm_loop_release_core_bus();
1315         kmem_cache_destroy(tcm_loop_cmd_cache);
1316         destroy_workqueue(tcm_loop_workqueue);
1317 }
1318
1319 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1320 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1321 MODULE_LICENSE("GPL");
1322 module_init(tcm_loop_fabric_init);
1323 module_exit(tcm_loop_fabric_exit);