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         .use_blk_tags           = 1,
 380         .track_queue_depth      = 1,
 381 };
 382
 383 static int tcm_loop_driver_probe(struct device *dev)
 384 {
 385         struct tcm_loop_hba *tl_hba;
 386         struct Scsi_Host *sh;
 387         int error, host_prot;
 388
 389         tl_hba = to_tcm_loop_hba(dev);
 390
 391         sh = scsi_host_alloc(&tcm_loop_driver_template,
 392                         sizeof(struct tcm_loop_hba));
 393         if (!sh) {
 394                 pr_err("Unable to allocate struct scsi_host\n");
 395                 return -ENODEV;
 396         }
 397         tl_hba->sh = sh;
 398
 399         /*
 400          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 401          */
 402         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 403         /*
 404          * Setup single ID, Channel and LUN for now..
 405          */
 406         sh->max_id = 2;
 407         sh->max_lun = 0;
 408         sh->max_channel = 0;
 409         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 410
 411         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 412                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 413                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 414
 415         scsi_host_set_prot(sh, host_prot);
 416         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 417
 418         error = scsi_add_host(sh, &tl_hba->dev);
 419         if (error) {
 420                 pr_err("%s: scsi_add_host failed\n", __func__);
 421                 scsi_host_put(sh);
 422                 return -ENODEV;
 423         }
 424         return 0;
 425 }
 426
 427 static int tcm_loop_driver_remove(struct device *dev)
 428 {
 429         struct tcm_loop_hba *tl_hba;
 430         struct Scsi_Host *sh;
 431
 432         tl_hba = to_tcm_loop_hba(dev);
 433         sh = tl_hba->sh;
 434
 435         scsi_remove_host(sh);
 436         scsi_host_put(sh);
 437         return 0;
 438 }
 439
 440 static void tcm_loop_release_adapter(struct device *dev)
 441 {
 442         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 443
 444         kfree(tl_hba);
 445 }
 446
 447 /*
 448  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 449  */
 450 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 451 {
 452         int ret;
 453
 454         tl_hba->dev.bus = &tcm_loop_lld_bus;
 455         tl_hba->dev.parent = tcm_loop_primary;
 456         tl_hba->dev.release = &tcm_loop_release_adapter;
 457         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 458
 459         ret = device_register(&tl_hba->dev);
 460         if (ret) {
 461                 pr_err("device_register() failed for"
 462                                 " tl_hba->dev: %d\n", ret);
 463                 return -ENODEV;
 464         }
 465
 466         return 0;
 467 }
 468
 469 /*
 470  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 471  * tcm_loop SCSI bus.
 472  */
 473 static int tcm_loop_alloc_core_bus(void)
 474 {
 475         int ret;
 476
 477         tcm_loop_primary = root_device_register("tcm_loop_0");
 478         if (IS_ERR(tcm_loop_primary)) {
 479                 pr_err("Unable to allocate tcm_loop_primary\n");
 480                 return PTR_ERR(tcm_loop_primary);
 481         }
 482
 483         ret = bus_register(&tcm_loop_lld_bus);
 484         if (ret) {
 485                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 486                 goto dev_unreg;
 487         }
 488
 489         ret = driver_register(&tcm_loop_driverfs);
 490         if (ret) {
 491                 pr_err("driver_register() failed for"
 492                                 "tcm_loop_driverfs\n");
 493                 goto bus_unreg;
 494         }
 495
 496         pr_debug("Initialized TCM Loop Core Bus\n");
 497         return ret;
 498
 499 bus_unreg:
 500         bus_unregister(&tcm_loop_lld_bus);
 501 dev_unreg:
 502         root_device_unregister(tcm_loop_primary);
 503         return ret;
 504 }
 505
 506 static void tcm_loop_release_core_bus(void)
 507 {
 508         driver_unregister(&tcm_loop_driverfs);
 509         bus_unregister(&tcm_loop_lld_bus);
 510         root_device_unregister(tcm_loop_primary);
 511
 512         pr_debug("Releasing TCM Loop Core BUS\n");
 513 }
 514
 515 static char *tcm_loop_get_fabric_name(void)
 516 {
 517         return "loopback";
 518 }
 519
 520 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 521 {
 522         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 523 }
 524
 525 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 526 {
 527         /*
 528          * Return the passed NAA identifier for the Target Port
 529          */
 530         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 531 }
 532
 533 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 534 {
 535         /*
 536          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 537          * to represent the SCSI Target Port.
 538          */
 539         return tl_tpg(se_tpg)->tl_tpgt;
 540 }
 541
 542 /*
 543  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 544  * based upon the incoming fabric dependent SCSI Initiator Port
 545  */
 546 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 547 {
 548         return 1;
 549 }
 550
 551 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 552 {
 553         return 0;
 554 }
 555
 556 /*
 557  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 558  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 559  */
 560 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 561 {
 562         return 0;
 563 }
 564
 565 /*
 566  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 567  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 568  * It has been added here as a nop for target_fabric_tf_ops_check()
 569  */
 570 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 571 {
 572         return 0;
 573 }
 574
 575 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 576 {
 577         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 578                                                    tl_se_tpg);
 579         return tl_tpg->tl_fabric_prot_type;
 580 }
 581
 582 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 583 {
 584         return 1;
 585 }
 586
 587 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 588 {
 589         return 1;
 590 }
 591
 592 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 593 {
 594         return;
 595 }
 596
 597 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 598 {
 599         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 600                         struct tcm_loop_cmd, tl_se_cmd);
 601
 602         return tl_cmd->sc_cmd_state;
 603 }
 604
 605 static int tcm_loop_shutdown_session(struct se_session *se_sess)
 606 {
 607         return 0;
 608 }
 609
 610 static void tcm_loop_close_session(struct se_session *se_sess)
 611 {
 612         return;
 613 };
 614
 615 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 616 {
 617         /*
 618          * Since Linux/SCSI has already sent down a struct scsi_cmnd
 619          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 620          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 621          * format with transport_generic_map_mem_to_cmd().
 622          *
 623          * We now tell TCM to add this WRITE CDB directly into the TCM storage
 624          * object execution queue.
 625          */
 626         target_execute_cmd(se_cmd);
 627         return 0;
 628 }
 629
 630 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
 631 {
 632         return 0;
 633 }
 634
 635 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 636 {
 637         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 638                                 struct tcm_loop_cmd, tl_se_cmd);
 639         struct scsi_cmnd *sc = tl_cmd->sc;
 640
 641         pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
 642                      " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 643
 644         sc->result = SAM_STAT_GOOD;
 645         set_host_byte(sc, DID_OK);
 646         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 647             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 648                 scsi_set_resid(sc, se_cmd->residual_count);
 649         sc->scsi_done(sc);
 650         return 0;
 651 }
 652
 653 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 654 {
 655         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 656                                 struct tcm_loop_cmd, tl_se_cmd);
 657         struct scsi_cmnd *sc = tl_cmd->sc;
 658
 659         pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
 660                         " cdb: 0x%02x\n", sc, sc->cmnd[0]);
 661
 662         if (se_cmd->sense_buffer &&
 663            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 664             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 665
 666                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 667                                 SCSI_SENSE_BUFFERSIZE);
 668                 sc->result = SAM_STAT_CHECK_CONDITION;
 669                 set_driver_byte(sc, DRIVER_SENSE);
 670         } else
 671                 sc->result = se_cmd->scsi_status;
 672
 673         set_host_byte(sc, DID_OK);
 674         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 675             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 676                 scsi_set_resid(sc, se_cmd->residual_count);
 677         sc->scsi_done(sc);
 678         return 0;
 679 }
 680
 681 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 682 {
 683         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
 684         struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
 685         /*
 686          * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
 687          * and wake up the wait_queue_head_t in tcm_loop_device_reset()
 688          */
 689         atomic_set(&tl_tmr->tmr_complete, 1);
 690         wake_up(&tl_tmr->tl_tmr_wait);
 691 }
 692
 693 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 694 {
 695         return;
 696 }
 697
 698 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 699 {
 700         switch (tl_hba->tl_proto_id) {
 701         case SCSI_PROTOCOL_SAS:
 702                 return "SAS";
 703         case SCSI_PROTOCOL_FCP:
 704                 return "FCP";
 705         case SCSI_PROTOCOL_ISCSI:
 706                 return "iSCSI";
 707         default:
 708                 break;
 709         }
 710
 711         return "Unknown";
 712 }
 713
 714 /* Start items for tcm_loop_port_cit */
 715
 716 static int tcm_loop_port_link(
 717         struct se_portal_group *se_tpg,
 718         struct se_lun *lun)
 719 {
 720         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 721                                 struct tcm_loop_tpg, tl_se_tpg);
 722         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 723
 724         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 725         /*
 726          * Add Linux/SCSI struct scsi_device by HCTL
 727          */
 728         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 729
 730         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 731         return 0;
 732 }
 733
 734 static void tcm_loop_port_unlink(
 735         struct se_portal_group *se_tpg,
 736         struct se_lun *se_lun)
 737 {
 738         struct scsi_device *sd;
 739         struct tcm_loop_hba *tl_hba;
 740         struct tcm_loop_tpg *tl_tpg;
 741
 742         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 743         tl_hba = tl_tpg->tl_hba;
 744
 745         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 746                                 se_lun->unpacked_lun);
 747         if (!sd) {
 748                 pr_err("Unable to locate struct scsi_device for %d:%d:"
 749                         "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 750                 return;
 751         }
 752         /*
 753          * Remove Linux/SCSI struct scsi_device by HCTL
 754          */
 755         scsi_remove_device(sd);
 756         scsi_device_put(sd);
 757
 758         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 759
 760         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 761 }
 762
 763 /* End items for tcm_loop_port_cit */
 764
 765 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 766                 struct config_item *item, char *page)
 767 {
 768         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 769         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 770                                                    tl_se_tpg);
 771
 772         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 773 }
 774
 775 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 776                 struct config_item *item, const char *page, size_t count)
 777 {
 778         struct se_portal_group *se_tpg = attrib_to_tpg(item);
 779         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 780                                                    tl_se_tpg);
 781         unsigned long val;
 782         int ret = kstrtoul(page, 0, &val);
 783
 784         if (ret) {
 785                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 786                 return ret;
 787         }
 788         if (val != 0 && val != 1 && val != 3) {
 789                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 790                 return -EINVAL;
 791         }
 792         tl_tpg->tl_fabric_prot_type = val;
 793
 794         return count;
 795 }
 796
 797 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 798
 799 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 800         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 801         NULL,
 802 };
 803
 804 /* Start items for tcm_loop_nexus_cit */
 805
 806 static int tcm_loop_make_nexus(
 807         struct tcm_loop_tpg *tl_tpg,
 808         const char *name)
 809 {
 810         struct se_portal_group *se_tpg;
 811         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 812         struct tcm_loop_nexus *tl_nexus;
 813         int ret = -ENOMEM;
 814
 815         if (tl_tpg->tl_nexus) {
 816                 pr_debug("tl_tpg->tl_nexus already exists\n");
 817                 return -EEXIST;
 818         }
 819         se_tpg = &tl_tpg->tl_se_tpg;
 820
 821         tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
 822         if (!tl_nexus) {
 823                 pr_err("Unable to allocate struct tcm_loop_nexus\n");
 824                 return -ENOMEM;
 825         }
 826         /*
 827          * Initialize the struct se_session pointer
 828          */
 829         tl_nexus->se_sess = transport_init_session(
 830                                 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
 831         if (IS_ERR(tl_nexus->se_sess)) {
 832                 ret = PTR_ERR(tl_nexus->se_sess);
 833                 goto out;
 834         }
 835         /*
 836          * Since we are running in 'demo mode' this call with generate a
 837          * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
 838          * Initiator port name of the passed configfs group 'name'.
 839          */
 840         tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
 841                                 se_tpg, (unsigned char *)name);
 842         if (!tl_nexus->se_sess->se_node_acl) {
 843                 transport_free_session(tl_nexus->se_sess);
 844                 goto out;
 845         }
 846         /* Now, register the I_T Nexus as active. */
 847         transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
 848                         tl_nexus->se_sess, tl_nexus);
 849         tl_tpg->tl_nexus = tl_nexus;
 850         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
 851                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
 852                 name);
 853         return 0;
 854
 855 out:
 856         kfree(tl_nexus);
 857         return ret;
 858 }
 859
 860 static int tcm_loop_drop_nexus(
 861         struct tcm_loop_tpg *tpg)
 862 {
 863         struct se_session *se_sess;
 864         struct tcm_loop_nexus *tl_nexus;
 865
 866         tl_nexus = tpg->tl_nexus;
 867         if (!tl_nexus)
 868                 return -ENODEV;
 869
 870         se_sess = tl_nexus->se_sess;
 871         if (!se_sess)
 872                 return -ENODEV;
 873
 874         if (atomic_read(&tpg->tl_tpg_port_count)) {
 875                 pr_err("Unable to remove TCM_Loop I_T Nexus with"
 876                         " active TPG port count: %d\n",
 877                         atomic_read(&tpg->tl_tpg_port_count));
 878                 return -EPERM;
 879         }
 880
 881         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
 882                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
 883                 tl_nexus->se_sess->se_node_acl->initiatorname);
 884         /*
 885          * Release the SCSI I_T Nexus to the emulated Target Port
 886          */
 887         transport_deregister_session(tl_nexus->se_sess);
 888         tpg->tl_nexus = NULL;
 889         kfree(tl_nexus);
 890         return 0;
 891 }
 892
 893 /* End items for tcm_loop_nexus_cit */
 894
 895 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 896 {
 897         struct se_portal_group *se_tpg = to_tpg(item);
 898         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 899                         struct tcm_loop_tpg, tl_se_tpg);
 900         struct tcm_loop_nexus *tl_nexus;
 901         ssize_t ret;
 902
 903         tl_nexus = tl_tpg->tl_nexus;
 904         if (!tl_nexus)
 905                 return -ENODEV;
 906
 907         ret = snprintf(page, PAGE_SIZE, "%s\n",
 908                 tl_nexus->se_sess->se_node_acl->initiatorname);
 909
 910         return ret;
 911 }
 912
 913 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 914                 const char *page, size_t count)
 915 {
 916         struct se_portal_group *se_tpg = to_tpg(item);
 917         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 918                         struct tcm_loop_tpg, tl_se_tpg);
 919         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 920         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 921         int ret;
 922         /*
 923          * Shutdown the active I_T nexus if 'NULL' is passed..
 924          */
 925         if (!strncmp(page, "NULL", 4)) {
 926                 ret = tcm_loop_drop_nexus(tl_tpg);
 927                 return (!ret) ? count : ret;
 928         }
 929         /*
 930          * Otherwise make sure the passed virtual Initiator port WWN matches
 931          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 932          * tcm_loop_make_nexus()
 933          */
 934         if (strlen(page) >= TL_WWN_ADDR_LEN) {
 935                 pr_err("Emulated NAA Sas Address: %s, exceeds"
 936                                 " max: %d\n", page, TL_WWN_ADDR_LEN);
 937                 return -EINVAL;
 938         }
 939         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 940
 941         ptr = strstr(i_port, "naa.");
 942         if (ptr) {
 943                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 944                         pr_err("Passed SAS Initiator Port %s does not"
 945                                 " match target port protoid: %s\n", i_port,
 946                                 tcm_loop_dump_proto_id(tl_hba));
 947                         return -EINVAL;
 948                 }
 949                 port_ptr = &i_port[0];
 950                 goto check_newline;
 951         }
 952         ptr = strstr(i_port, "fc.");
 953         if (ptr) {
 954                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 955                         pr_err("Passed FCP Initiator Port %s does not"
 956                                 " match target port protoid: %s\n", i_port,
 957                                 tcm_loop_dump_proto_id(tl_hba));
 958                         return -EINVAL;
 959                 }
 960                 port_ptr = &i_port[3]; /* Skip over "fc." */
 961                 goto check_newline;
 962         }
 963         ptr = strstr(i_port, "iqn.");
 964         if (ptr) {
 965                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 966                         pr_err("Passed iSCSI Initiator Port %s does not"
 967                                 " match target port protoid: %s\n", i_port,
 968                                 tcm_loop_dump_proto_id(tl_hba));
 969                         return -EINVAL;
 970                 }
 971                 port_ptr = &i_port[0];
 972                 goto check_newline;
 973         }
 974         pr_err("Unable to locate prefix for emulated Initiator Port:"
 975                         " %s\n", i_port);
 976         return -EINVAL;
 977         /*
 978          * Clear any trailing newline for the NAA WWN
 979          */
 980 check_newline:
 981         if (i_port[strlen(i_port)-1] == '\n')
 982                 i_port[strlen(i_port)-1] = '\0';
 983
 984         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 985         if (ret < 0)
 986                 return ret;
 987
 988         return count;
 989 }
 990
 991 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 992                 char *page)
 993 {
 994         struct se_portal_group *se_tpg = to_tpg(item);
 995         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 996                         struct tcm_loop_tpg, tl_se_tpg);
 997         const char *status = NULL;
 998         ssize_t ret = -EINVAL;
 999
1000         switch (tl_tpg->tl_transport_status) {
1001         case TCM_TRANSPORT_ONLINE:
1002                 status = "online";
1003                 break;
1004         case TCM_TRANSPORT_OFFLINE:
1005                 status = "offline";
1006                 break;
1007         default:
1008                 break;
1009         }
1010
1011         if (status)
1012                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1013
1014         return ret;
1015 }
1016
1017 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
1018                 const char *page, size_t count)
1019 {
1020         struct se_portal_group *se_tpg = to_tpg(item);
1021         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1022                         struct tcm_loop_tpg, tl_se_tpg);
1023
1024         if (!strncmp(page, "online", 6)) {
1025                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1026                 return count;
1027         }
1028         if (!strncmp(page, "offline", 7)) {
1029                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1030                 if (tl_tpg->tl_nexus) {
1031                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
1032
1033                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
1034                 }
1035                 return count;
1036         }
1037         return -EINVAL;
1038 }
1039
1040 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
1041 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
1042
1043 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1044         &tcm_loop_tpg_attr_nexus,
1045         &tcm_loop_tpg_attr_transport_status,
1046         NULL,
1047 };
1048
1049 /* Start items for tcm_loop_naa_cit */
1050
1051 static struct se_portal_group *tcm_loop_make_naa_tpg(
1052         struct se_wwn *wwn,
1053         struct config_group *group,
1054         const char *name)
1055 {
1056         struct tcm_loop_hba *tl_hba = container_of(wwn,
1057                         struct tcm_loop_hba, tl_hba_wwn);
1058         struct tcm_loop_tpg *tl_tpg;
1059         int ret;
1060         unsigned long tpgt;
1061
1062         if (strstr(name, "tpgt_") != name) {
1063                 pr_err("Unable to locate \"tpgt_#\" directory"
1064                                 " group\n");
1065                 return ERR_PTR(-EINVAL);
1066         }
1067         if (kstrtoul(name+5, 10, &tpgt))
1068                 return ERR_PTR(-EINVAL);
1069
1070         if (tpgt >= TL_TPGS_PER_HBA) {
1071                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
1072                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
1073                 return ERR_PTR(-EINVAL);
1074         }
1075         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1076         tl_tpg->tl_hba = tl_hba;
1077         tl_tpg->tl_tpgt = tpgt;
1078         /*
1079          * Register the tl_tpg as a emulated TCM Target Endpoint
1080          */
1081         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1082         if (ret < 0)
1083                 return ERR_PTR(-ENOMEM);
1084
1085         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1086                 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
1087                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1088
1089         return &tl_tpg->tl_se_tpg;
1090 }
1091
1092 static void tcm_loop_drop_naa_tpg(
1093         struct se_portal_group *se_tpg)
1094 {
1095         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1096         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1097                                 struct tcm_loop_tpg, tl_se_tpg);
1098         struct tcm_loop_hba *tl_hba;
1099         unsigned short tpgt;
1100
1101         tl_hba = tl_tpg->tl_hba;
1102         tpgt = tl_tpg->tl_tpgt;
1103         /*
1104          * Release the I_T Nexus for the Virtual target link if present
1105          */
1106         tcm_loop_drop_nexus(tl_tpg);
1107         /*
1108          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1109          */
1110         core_tpg_deregister(se_tpg);
1111
1112         tl_tpg->tl_hba = NULL;
1113         tl_tpg->tl_tpgt = 0;
1114
1115         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1116                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1117                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1118 }
1119
1120 /* End items for tcm_loop_naa_cit */
1121
1122 /* Start items for tcm_loop_cit */
1123
1124 static struct se_wwn *tcm_loop_make_scsi_hba(
1125         struct target_fabric_configfs *tf,
1126         struct config_group *group,
1127         const char *name)
1128 {
1129         struct tcm_loop_hba *tl_hba;
1130         struct Scsi_Host *sh;
1131         char *ptr;
1132         int ret, off = 0;
1133
1134         tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1135         if (!tl_hba) {
1136                 pr_err("Unable to allocate struct tcm_loop_hba\n");
1137                 return ERR_PTR(-ENOMEM);
1138         }
1139         /*
1140          * Determine the emulated Protocol Identifier and Target Port Name
1141          * based on the incoming configfs directory name.
1142          */
1143         ptr = strstr(name, "naa.");
1144         if (ptr) {
1145                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1146                 goto check_len;
1147         }
1148         ptr = strstr(name, "fc.");
1149         if (ptr) {
1150                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1151                 off = 3; /* Skip over "fc." */
1152                 goto check_len;
1153         }
1154         ptr = strstr(name, "iqn.");
1155         if (!ptr) {
1156                 pr_err("Unable to locate prefix for emulated Target "
1157                                 "Port: %s\n", name);
1158                 ret = -EINVAL;
1159                 goto out;
1160         }
1161         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1162
1163 check_len:
1164         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1165                 pr_err("Emulated NAA %s Address: %s, exceeds"
1166                         " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1167                         TL_WWN_ADDR_LEN);
1168                 ret = -EINVAL;
1169                 goto out;
1170         }
1171         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1172
1173         /*
1174          * Call device_register(tl_hba->dev) to register the emulated
1175          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1176          * device_register() callbacks in tcm_loop_driver_probe()
1177          */
1178         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1179         if (ret)
1180                 goto out;
1181
1182         sh = tl_hba->sh;
1183         tcm_loop_hba_no_cnt++;
1184         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1185                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1186                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1187
1188         return &tl_hba->tl_hba_wwn;
1189 out:
1190         kfree(tl_hba);
1191         return ERR_PTR(ret);
1192 }
1193
1194 static void tcm_loop_drop_scsi_hba(
1195         struct se_wwn *wwn)
1196 {
1197         struct tcm_loop_hba *tl_hba = container_of(wwn,
1198                                 struct tcm_loop_hba, tl_hba_wwn);
1199
1200         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1201                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1202                 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1203                 tl_hba->sh->host_no);
1204         /*
1205          * Call device_unregister() on the original tl_hba->dev.
1206          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1207          * release *tl_hba;
1208          */
1209         device_unregister(&tl_hba->dev);
1210 }
1211
1212 /* Start items for tcm_loop_cit */
1213 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1214 {
1215         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1216 }
1217
1218 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1219
1220 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1221         &tcm_loop_wwn_attr_version,
1222         NULL,
1223 };
1224
1225 /* End items for tcm_loop_cit */
1226
1227 static const struct target_core_fabric_ops loop_ops = {
1228         .module                         = THIS_MODULE,
1229         .name                           = "loopback",
1230         .get_fabric_name                = tcm_loop_get_fabric_name,
1231         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1232         .tpg_get_tag                    = tcm_loop_get_tag,
1233         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1234         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1235         .tpg_check_demo_mode_write_protect =
1236                                 tcm_loop_check_demo_mode_write_protect,
1237         .tpg_check_prod_mode_write_protect =
1238                                 tcm_loop_check_prod_mode_write_protect,
1239         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1240         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1241         .check_stop_free                = tcm_loop_check_stop_free,
1242         .release_cmd                    = tcm_loop_release_cmd,
1243         .shutdown_session               = tcm_loop_shutdown_session,
1244         .close_session                  = tcm_loop_close_session,
1245         .sess_get_index                 = tcm_loop_sess_get_index,
1246         .write_pending                  = tcm_loop_write_pending,
1247         .write_pending_status           = tcm_loop_write_pending_status,
1248         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1249         .get_cmd_state                  = tcm_loop_get_cmd_state,
1250         .queue_data_in                  = tcm_loop_queue_data_in,
1251         .queue_status                   = tcm_loop_queue_status,
1252         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1253         .aborted_task                   = tcm_loop_aborted_task,
1254         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1255         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1256         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1257         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1258         .fabric_post_link               = tcm_loop_port_link,
1259         .fabric_pre_unlink              = tcm_loop_port_unlink,
1260         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1261         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1262         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1263 };
1264
1265 static int __init tcm_loop_fabric_init(void)
1266 {
1267         int ret = -ENOMEM;
1268
1269         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1270         if (!tcm_loop_workqueue)
1271                 goto out;
1272
1273         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1274                                 sizeof(struct tcm_loop_cmd),
1275                                 __alignof__(struct tcm_loop_cmd),
1276                                 0, NULL);
1277         if (!tcm_loop_cmd_cache) {
1278                 pr_debug("kmem_cache_create() for"
1279                         " tcm_loop_cmd_cache failed\n");
1280                 goto out_destroy_workqueue;
1281         }
1282
1283         ret = tcm_loop_alloc_core_bus();
1284         if (ret)
1285                 goto out_destroy_cache;
1286
1287         ret = target_register_template(&loop_ops);
1288         if (ret)
1289                 goto out_release_core_bus;
1290
1291         return 0;
1292
1293 out_release_core_bus:
1294         tcm_loop_release_core_bus();
1295 out_destroy_cache:
1296         kmem_cache_destroy(tcm_loop_cmd_cache);
1297 out_destroy_workqueue:
1298         destroy_workqueue(tcm_loop_workqueue);
1299 out:
1300         return ret;
1301 }
1302
1303 static void __exit tcm_loop_fabric_exit(void)
1304 {
1305         target_unregister_template(&loop_ops);
1306         tcm_loop_release_core_bus();
1307         kmem_cache_destroy(tcm_loop_cmd_cache);
1308         destroy_workqueue(tcm_loop_workqueue);
1309 }
1310
1311 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1312 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1313 MODULE_LICENSE("GPL");
1314 module_init(tcm_loop_fabric_init);
1315 module_exit(tcm_loop_fabric_exit);