linux/drivers/target/loopback/tcm_loop.c
<<
>>
Prefs
   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
  42static struct kmem_cache *tcm_loop_cmd_cache;
  43
  44static int tcm_loop_hba_no_cnt;
  45
  46static int tcm_loop_queue_status(struct se_cmd *se_cmd);
  47
  48static unsigned int tcm_loop_nr_hw_queues = 1;
  49module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
  50
  51static unsigned int tcm_loop_can_queue = 1024;
  52module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
  53
  54static unsigned int tcm_loop_cmd_per_lun = 1024;
  55module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
  56
  57/*
  58 * Called from struct target_core_fabric_ops->check_stop_free()
  59 */
  60static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
  61{
  62        return transport_generic_free_cmd(se_cmd, 0);
  63}
  64
  65static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
  66{
  67        struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
  68                                struct tcm_loop_cmd, tl_se_cmd);
  69        struct scsi_cmnd *sc = tl_cmd->sc;
  70
  71        if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
  72                kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
  73        else
  74                sc->scsi_done(sc);
  75}
  76
  77static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
  78{
  79        seq_puts(m, "tcm_loop_proc_info()\n");
  80        return 0;
  81}
  82
  83static int tcm_loop_driver_probe(struct device *);
  84static int tcm_loop_driver_remove(struct device *);
  85
  86static int pseudo_lld_bus_match(struct device *dev,
  87                                struct device_driver *dev_driver)
  88{
  89        return 1;
  90}
  91
  92static 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
  99static 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 */
 106static struct device *tcm_loop_primary;
 107
 108static void tcm_loop_target_queue_cmd(struct tcm_loop_cmd *tl_cmd)
 109{
 110        struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
 111        struct scsi_cmnd *sc = tl_cmd->sc;
 112        struct tcm_loop_nexus *tl_nexus;
 113        struct tcm_loop_hba *tl_hba;
 114        struct tcm_loop_tpg *tl_tpg;
 115        struct scatterlist *sgl_bidi = NULL;
 116        u32 sgl_bidi_count = 0, transfer_length;
 117
 118        tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 119        tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 120
 121        /*
 122         * Ensure that this tl_tpg reference from the incoming sc->device->id
 123         * has already been configured via tcm_loop_make_naa_tpg().
 124         */
 125        if (!tl_tpg->tl_hba) {
 126                set_host_byte(sc, DID_NO_CONNECT);
 127                goto out_done;
 128        }
 129        if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
 130                set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
 131                goto out_done;
 132        }
 133        tl_nexus = tl_tpg->tl_nexus;
 134        if (!tl_nexus) {
 135                scmd_printk(KERN_ERR, sc,
 136                            "TCM_Loop I_T Nexus does not exist\n");
 137                set_host_byte(sc, DID_ERROR);
 138                goto out_done;
 139        }
 140
 141        transfer_length = scsi_transfer_length(sc);
 142        if (!scsi_prot_sg_count(sc) &&
 143            scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
 144                se_cmd->prot_pto = true;
 145                /*
 146                 * loopback transport doesn't support
 147                 * WRITE_GENERATE, READ_STRIP protection
 148                 * information operations, go ahead unprotected.
 149                 */
 150                transfer_length = scsi_bufflen(sc);
 151        }
 152
 153        se_cmd->tag = tl_cmd->sc_cmd_tag;
 154        target_init_cmd(se_cmd, tl_nexus->se_sess, &tl_cmd->tl_sense_buf[0],
 155                        tl_cmd->sc->device->lun, transfer_length,
 156                        TCM_SIMPLE_TAG, sc->sc_data_direction, 0);
 157
 158        if (target_submit_prep(se_cmd, sc->cmnd, scsi_sglist(sc),
 159                               scsi_sg_count(sc), sgl_bidi, sgl_bidi_count,
 160                               scsi_prot_sglist(sc), scsi_prot_sg_count(sc),
 161                               GFP_ATOMIC))
 162                return;
 163
 164        target_queue_submission(se_cmd);
 165        return;
 166
 167out_done:
 168        sc->scsi_done(sc);
 169}
 170
 171/*
 172 * ->queuecommand can be and usually is called from interrupt context, so
 173 * defer the actual submission to a workqueue.
 174 */
 175static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
 176{
 177        struct tcm_loop_cmd *tl_cmd = scsi_cmd_priv(sc);
 178
 179        pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
 180                 __func__, sc->device->host->host_no, sc->device->id,
 181                 sc->device->channel, sc->device->lun, sc->cmnd[0],
 182                 scsi_bufflen(sc));
 183
 184        memset(tl_cmd, 0, sizeof(*tl_cmd));
 185        tl_cmd->sc = sc;
 186        tl_cmd->sc_cmd_tag = sc->request->tag;
 187
 188        tcm_loop_target_queue_cmd(tl_cmd);
 189        return 0;
 190}
 191
 192/*
 193 * Called from SCSI EH process context to issue a LUN_RESET TMR
 194 * to struct scsi_device
 195 */
 196static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
 197                              u64 lun, int task, enum tcm_tmreq_table tmr)
 198{
 199        struct se_cmd *se_cmd;
 200        struct se_session *se_sess;
 201        struct tcm_loop_nexus *tl_nexus;
 202        struct tcm_loop_cmd *tl_cmd;
 203        int ret = TMR_FUNCTION_FAILED, rc;
 204
 205        /*
 206         * Locate the tl_nexus and se_sess pointers
 207         */
 208        tl_nexus = tl_tpg->tl_nexus;
 209        if (!tl_nexus) {
 210                pr_err("Unable to perform device reset without active I_T Nexus\n");
 211                return ret;
 212        }
 213
 214        tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
 215        if (!tl_cmd)
 216                return ret;
 217
 218        init_completion(&tl_cmd->tmr_done);
 219
 220        se_cmd = &tl_cmd->tl_se_cmd;
 221        se_sess = tl_tpg->tl_nexus->se_sess;
 222
 223        rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
 224                               NULL, tmr, GFP_KERNEL, task,
 225                               TARGET_SCF_ACK_KREF);
 226        if (rc < 0)
 227                goto release;
 228        wait_for_completion(&tl_cmd->tmr_done);
 229        ret = se_cmd->se_tmr_req->response;
 230        target_put_sess_cmd(se_cmd);
 231
 232out:
 233        return ret;
 234
 235release:
 236        kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
 237        goto out;
 238}
 239
 240static int tcm_loop_abort_task(struct scsi_cmnd *sc)
 241{
 242        struct tcm_loop_hba *tl_hba;
 243        struct tcm_loop_tpg *tl_tpg;
 244        int ret = FAILED;
 245
 246        /*
 247         * Locate the tcm_loop_hba_t pointer
 248         */
 249        tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 250        tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 251        ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 252                                 sc->request->tag, TMR_ABORT_TASK);
 253        return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 254}
 255
 256/*
 257 * Called from SCSI EH process context to issue a LUN_RESET TMR
 258 * to struct scsi_device
 259 */
 260static int tcm_loop_device_reset(struct scsi_cmnd *sc)
 261{
 262        struct tcm_loop_hba *tl_hba;
 263        struct tcm_loop_tpg *tl_tpg;
 264        int ret = FAILED;
 265
 266        /*
 267         * Locate the tcm_loop_hba_t pointer
 268         */
 269        tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 270        tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 271
 272        ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
 273                                 0, TMR_LUN_RESET);
 274        return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
 275}
 276
 277static int tcm_loop_target_reset(struct scsi_cmnd *sc)
 278{
 279        struct tcm_loop_hba *tl_hba;
 280        struct tcm_loop_tpg *tl_tpg;
 281
 282        /*
 283         * Locate the tcm_loop_hba_t pointer
 284         */
 285        tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
 286        if (!tl_hba) {
 287                pr_err("Unable to perform device reset without active I_T Nexus\n");
 288                return FAILED;
 289        }
 290        /*
 291         * Locate the tl_tpg pointer from TargetID in sc->device->id
 292         */
 293        tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 294        if (tl_tpg) {
 295                tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 296                return SUCCESS;
 297        }
 298        return FAILED;
 299}
 300
 301static struct scsi_host_template tcm_loop_driver_template = {
 302        .show_info              = tcm_loop_show_info,
 303        .proc_name              = "tcm_loopback",
 304        .name                   = "TCM_Loopback",
 305        .queuecommand           = tcm_loop_queuecommand,
 306        .change_queue_depth     = scsi_change_queue_depth,
 307        .eh_abort_handler = tcm_loop_abort_task,
 308        .eh_device_reset_handler = tcm_loop_device_reset,
 309        .eh_target_reset_handler = tcm_loop_target_reset,
 310        .this_id                = -1,
 311        .sg_tablesize           = 256,
 312        .max_sectors            = 0xFFFF,
 313        .dma_boundary           = PAGE_SIZE - 1,
 314        .module                 = THIS_MODULE,
 315        .track_queue_depth      = 1,
 316        .cmd_size               = sizeof(struct tcm_loop_cmd),
 317};
 318
 319static int tcm_loop_driver_probe(struct device *dev)
 320{
 321        struct tcm_loop_hba *tl_hba;
 322        struct Scsi_Host *sh;
 323        int error, host_prot;
 324
 325        tl_hba = to_tcm_loop_hba(dev);
 326
 327        sh = scsi_host_alloc(&tcm_loop_driver_template,
 328                        sizeof(struct tcm_loop_hba));
 329        if (!sh) {
 330                pr_err("Unable to allocate struct scsi_host\n");
 331                return -ENODEV;
 332        }
 333        tl_hba->sh = sh;
 334
 335        /*
 336         * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
 337         */
 338        *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
 339        /*
 340         * Setup single ID, Channel and LUN for now..
 341         */
 342        sh->max_id = 2;
 343        sh->max_lun = 0;
 344        sh->max_channel = 0;
 345        sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 346        sh->nr_hw_queues = tcm_loop_nr_hw_queues;
 347        sh->can_queue = tcm_loop_can_queue;
 348        sh->cmd_per_lun = tcm_loop_cmd_per_lun;
 349
 350        host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
 351                    SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
 352                    SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 353
 354        scsi_host_set_prot(sh, host_prot);
 355        scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 356
 357        error = scsi_add_host(sh, &tl_hba->dev);
 358        if (error) {
 359                pr_err("%s: scsi_add_host failed\n", __func__);
 360                scsi_host_put(sh);
 361                return -ENODEV;
 362        }
 363        return 0;
 364}
 365
 366static int tcm_loop_driver_remove(struct device *dev)
 367{
 368        struct tcm_loop_hba *tl_hba;
 369        struct Scsi_Host *sh;
 370
 371        tl_hba = to_tcm_loop_hba(dev);
 372        sh = tl_hba->sh;
 373
 374        scsi_remove_host(sh);
 375        scsi_host_put(sh);
 376        return 0;
 377}
 378
 379static void tcm_loop_release_adapter(struct device *dev)
 380{
 381        struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 382
 383        kfree(tl_hba);
 384}
 385
 386/*
 387 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 388 */
 389static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
 390{
 391        int ret;
 392
 393        tl_hba->dev.bus = &tcm_loop_lld_bus;
 394        tl_hba->dev.parent = tcm_loop_primary;
 395        tl_hba->dev.release = &tcm_loop_release_adapter;
 396        dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 397
 398        ret = device_register(&tl_hba->dev);
 399        if (ret) {
 400                pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
 401                return -ENODEV;
 402        }
 403
 404        return 0;
 405}
 406
 407/*
 408 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 409 * tcm_loop SCSI bus.
 410 */
 411static int tcm_loop_alloc_core_bus(void)
 412{
 413        int ret;
 414
 415        tcm_loop_primary = root_device_register("tcm_loop_0");
 416        if (IS_ERR(tcm_loop_primary)) {
 417                pr_err("Unable to allocate tcm_loop_primary\n");
 418                return PTR_ERR(tcm_loop_primary);
 419        }
 420
 421        ret = bus_register(&tcm_loop_lld_bus);
 422        if (ret) {
 423                pr_err("bus_register() failed for tcm_loop_lld_bus\n");
 424                goto dev_unreg;
 425        }
 426
 427        ret = driver_register(&tcm_loop_driverfs);
 428        if (ret) {
 429                pr_err("driver_register() failed for tcm_loop_driverfs\n");
 430                goto bus_unreg;
 431        }
 432
 433        pr_debug("Initialized TCM Loop Core Bus\n");
 434        return ret;
 435
 436bus_unreg:
 437        bus_unregister(&tcm_loop_lld_bus);
 438dev_unreg:
 439        root_device_unregister(tcm_loop_primary);
 440        return ret;
 441}
 442
 443static void tcm_loop_release_core_bus(void)
 444{
 445        driver_unregister(&tcm_loop_driverfs);
 446        bus_unregister(&tcm_loop_lld_bus);
 447        root_device_unregister(tcm_loop_primary);
 448
 449        pr_debug("Releasing TCM Loop Core BUS\n");
 450}
 451
 452static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
 453{
 454        return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 455}
 456
 457static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
 458{
 459        /*
 460         * Return the passed NAA identifier for the Target Port
 461         */
 462        return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
 463}
 464
 465static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
 466{
 467        /*
 468         * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
 469         * to represent the SCSI Target Port.
 470         */
 471        return tl_tpg(se_tpg)->tl_tpgt;
 472}
 473
 474/*
 475 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 476 * based upon the incoming fabric dependent SCSI Initiator Port
 477 */
 478static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
 479{
 480        return 1;
 481}
 482
 483static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
 484{
 485        return 0;
 486}
 487
 488/*
 489 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 490 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 491 */
 492static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
 493{
 494        return 0;
 495}
 496
 497/*
 498 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 499 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 500 * It has been added here as a nop for target_fabric_tf_ops_check()
 501 */
 502static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
 503{
 504        return 0;
 505}
 506
 507static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
 508{
 509        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 510                                                   tl_se_tpg);
 511        return tl_tpg->tl_fabric_prot_type;
 512}
 513
 514static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
 515{
 516        return 1;
 517}
 518
 519static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
 520{
 521        return 1;
 522}
 523
 524static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
 525{
 526        return;
 527}
 528
 529static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 530{
 531        struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 532                        struct tcm_loop_cmd, tl_se_cmd);
 533
 534        return tl_cmd->sc_cmd_state;
 535}
 536
 537static int tcm_loop_write_pending(struct se_cmd *se_cmd)
 538{
 539        /*
 540         * Since Linux/SCSI has already sent down a struct scsi_cmnd
 541         * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
 542         * memory, and memory has already been mapped to struct se_cmd->t_mem_list
 543         * format with transport_generic_map_mem_to_cmd().
 544         *
 545         * We now tell TCM to add this WRITE CDB directly into the TCM storage
 546         * object execution queue.
 547         */
 548        target_execute_cmd(se_cmd);
 549        return 0;
 550}
 551
 552static int tcm_loop_queue_data_or_status(const char *func,
 553                struct se_cmd *se_cmd, u8 scsi_status)
 554{
 555        struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 556                                struct tcm_loop_cmd, tl_se_cmd);
 557        struct scsi_cmnd *sc = tl_cmd->sc;
 558
 559        pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
 560                 func, sc, sc->cmnd[0]);
 561
 562        if (se_cmd->sense_buffer &&
 563           ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
 564            (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 565
 566                memcpy(sc->sense_buffer, se_cmd->sense_buffer,
 567                                SCSI_SENSE_BUFFERSIZE);
 568                sc->result = SAM_STAT_CHECK_CONDITION;
 569        } else
 570                sc->result = scsi_status;
 571
 572        set_host_byte(sc, DID_OK);
 573        if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
 574            (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
 575                scsi_set_resid(sc, se_cmd->residual_count);
 576        return 0;
 577}
 578
 579static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
 580{
 581        return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
 582}
 583
 584static int tcm_loop_queue_status(struct se_cmd *se_cmd)
 585{
 586        return tcm_loop_queue_data_or_status(__func__,
 587                                             se_cmd, se_cmd->scsi_status);
 588}
 589
 590static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 591{
 592        struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
 593                                struct tcm_loop_cmd, tl_se_cmd);
 594
 595        /* Wake up tcm_loop_issue_tmr(). */
 596        complete(&tl_cmd->tmr_done);
 597}
 598
 599static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
 600{
 601        return;
 602}
 603
 604static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 605{
 606        switch (tl_hba->tl_proto_id) {
 607        case SCSI_PROTOCOL_SAS:
 608                return "SAS";
 609        case SCSI_PROTOCOL_FCP:
 610                return "FCP";
 611        case SCSI_PROTOCOL_ISCSI:
 612                return "iSCSI";
 613        default:
 614                break;
 615        }
 616
 617        return "Unknown";
 618}
 619
 620/* Start items for tcm_loop_port_cit */
 621
 622static int tcm_loop_port_link(
 623        struct se_portal_group *se_tpg,
 624        struct se_lun *lun)
 625{
 626        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 627                                struct tcm_loop_tpg, tl_se_tpg);
 628        struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 629
 630        atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
 631        /*
 632         * Add Linux/SCSI struct scsi_device by HCTL
 633         */
 634        scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 635
 636        pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
 637        return 0;
 638}
 639
 640static void tcm_loop_port_unlink(
 641        struct se_portal_group *se_tpg,
 642        struct se_lun *se_lun)
 643{
 644        struct scsi_device *sd;
 645        struct tcm_loop_hba *tl_hba;
 646        struct tcm_loop_tpg *tl_tpg;
 647
 648        tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
 649        tl_hba = tl_tpg->tl_hba;
 650
 651        sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
 652                                se_lun->unpacked_lun);
 653        if (!sd) {
 654                pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
 655                       0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
 656                return;
 657        }
 658        /*
 659         * Remove Linux/SCSI struct scsi_device by HCTL
 660         */
 661        scsi_remove_device(sd);
 662        scsi_device_put(sd);
 663
 664        atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 665
 666        pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
 667}
 668
 669/* End items for tcm_loop_port_cit */
 670
 671static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
 672                struct config_item *item, char *page)
 673{
 674        struct se_portal_group *se_tpg = attrib_to_tpg(item);
 675        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 676                                                   tl_se_tpg);
 677
 678        return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
 679}
 680
 681static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
 682                struct config_item *item, const char *page, size_t count)
 683{
 684        struct se_portal_group *se_tpg = attrib_to_tpg(item);
 685        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
 686                                                   tl_se_tpg);
 687        unsigned long val;
 688        int ret = kstrtoul(page, 0, &val);
 689
 690        if (ret) {
 691                pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
 692                return ret;
 693        }
 694        if (val != 0 && val != 1 && val != 3) {
 695                pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
 696                return -EINVAL;
 697        }
 698        tl_tpg->tl_fabric_prot_type = val;
 699
 700        return count;
 701}
 702
 703CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 704
 705static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
 706        &tcm_loop_tpg_attrib_attr_fabric_prot_type,
 707        NULL,
 708};
 709
 710/* Start items for tcm_loop_nexus_cit */
 711
 712static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
 713                                  struct se_session *se_sess, void *p)
 714{
 715        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 716                                        struct tcm_loop_tpg, tl_se_tpg);
 717
 718        tl_tpg->tl_nexus = p;
 719        return 0;
 720}
 721
 722static int tcm_loop_make_nexus(
 723        struct tcm_loop_tpg *tl_tpg,
 724        const char *name)
 725{
 726        struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 727        struct tcm_loop_nexus *tl_nexus;
 728        int ret;
 729
 730        if (tl_tpg->tl_nexus) {
 731                pr_debug("tl_tpg->tl_nexus already exists\n");
 732                return -EEXIST;
 733        }
 734
 735        tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
 736        if (!tl_nexus)
 737                return -ENOMEM;
 738
 739        tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
 740                                        TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
 741                                        name, tl_nexus, tcm_loop_alloc_sess_cb);
 742        if (IS_ERR(tl_nexus->se_sess)) {
 743                ret = PTR_ERR(tl_nexus->se_sess);
 744                kfree(tl_nexus);
 745                return ret;
 746        }
 747
 748        pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
 749                 tcm_loop_dump_proto_id(tl_hba), name);
 750        return 0;
 751}
 752
 753static int tcm_loop_drop_nexus(
 754        struct tcm_loop_tpg *tpg)
 755{
 756        struct se_session *se_sess;
 757        struct tcm_loop_nexus *tl_nexus;
 758
 759        tl_nexus = tpg->tl_nexus;
 760        if (!tl_nexus)
 761                return -ENODEV;
 762
 763        se_sess = tl_nexus->se_sess;
 764        if (!se_sess)
 765                return -ENODEV;
 766
 767        if (atomic_read(&tpg->tl_tpg_port_count)) {
 768                pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
 769                       atomic_read(&tpg->tl_tpg_port_count));
 770                return -EPERM;
 771        }
 772
 773        pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
 774                 tcm_loop_dump_proto_id(tpg->tl_hba),
 775                 tl_nexus->se_sess->se_node_acl->initiatorname);
 776        /*
 777         * Release the SCSI I_T Nexus to the emulated Target Port
 778         */
 779        target_remove_session(se_sess);
 780        tpg->tl_nexus = NULL;
 781        kfree(tl_nexus);
 782        return 0;
 783}
 784
 785/* End items for tcm_loop_nexus_cit */
 786
 787static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
 788{
 789        struct se_portal_group *se_tpg = to_tpg(item);
 790        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 791                        struct tcm_loop_tpg, tl_se_tpg);
 792        struct tcm_loop_nexus *tl_nexus;
 793        ssize_t ret;
 794
 795        tl_nexus = tl_tpg->tl_nexus;
 796        if (!tl_nexus)
 797                return -ENODEV;
 798
 799        ret = snprintf(page, PAGE_SIZE, "%s\n",
 800                tl_nexus->se_sess->se_node_acl->initiatorname);
 801
 802        return ret;
 803}
 804
 805static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
 806                const char *page, size_t count)
 807{
 808        struct se_portal_group *se_tpg = to_tpg(item);
 809        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 810                        struct tcm_loop_tpg, tl_se_tpg);
 811        struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 812        unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
 813        int ret;
 814        /*
 815         * Shutdown the active I_T nexus if 'NULL' is passed..
 816         */
 817        if (!strncmp(page, "NULL", 4)) {
 818                ret = tcm_loop_drop_nexus(tl_tpg);
 819                return (!ret) ? count : ret;
 820        }
 821        /*
 822         * Otherwise make sure the passed virtual Initiator port WWN matches
 823         * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
 824         * tcm_loop_make_nexus()
 825         */
 826        if (strlen(page) >= TL_WWN_ADDR_LEN) {
 827                pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
 828                       page, TL_WWN_ADDR_LEN);
 829                return -EINVAL;
 830        }
 831        snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 832
 833        ptr = strstr(i_port, "naa.");
 834        if (ptr) {
 835                if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
 836                        pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
 837                               i_port, tcm_loop_dump_proto_id(tl_hba));
 838                        return -EINVAL;
 839                }
 840                port_ptr = &i_port[0];
 841                goto check_newline;
 842        }
 843        ptr = strstr(i_port, "fc.");
 844        if (ptr) {
 845                if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
 846                        pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
 847                               i_port, tcm_loop_dump_proto_id(tl_hba));
 848                        return -EINVAL;
 849                }
 850                port_ptr = &i_port[3]; /* Skip over "fc." */
 851                goto check_newline;
 852        }
 853        ptr = strstr(i_port, "iqn.");
 854        if (ptr) {
 855                if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
 856                        pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
 857                               i_port, tcm_loop_dump_proto_id(tl_hba));
 858                        return -EINVAL;
 859                }
 860                port_ptr = &i_port[0];
 861                goto check_newline;
 862        }
 863        pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
 864               i_port);
 865        return -EINVAL;
 866        /*
 867         * Clear any trailing newline for the NAA WWN
 868         */
 869check_newline:
 870        if (i_port[strlen(i_port)-1] == '\n')
 871                i_port[strlen(i_port)-1] = '\0';
 872
 873        ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
 874        if (ret < 0)
 875                return ret;
 876
 877        return count;
 878}
 879
 880static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
 881                char *page)
 882{
 883        struct se_portal_group *se_tpg = to_tpg(item);
 884        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 885                        struct tcm_loop_tpg, tl_se_tpg);
 886        const char *status = NULL;
 887        ssize_t ret = -EINVAL;
 888
 889        switch (tl_tpg->tl_transport_status) {
 890        case TCM_TRANSPORT_ONLINE:
 891                status = "online";
 892                break;
 893        case TCM_TRANSPORT_OFFLINE:
 894                status = "offline";
 895                break;
 896        default:
 897                break;
 898        }
 899
 900        if (status)
 901                ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 902
 903        return ret;
 904}
 905
 906static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
 907                const char *page, size_t count)
 908{
 909        struct se_portal_group *se_tpg = to_tpg(item);
 910        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 911                        struct tcm_loop_tpg, tl_se_tpg);
 912
 913        if (!strncmp(page, "online", 6)) {
 914                tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
 915                return count;
 916        }
 917        if (!strncmp(page, "offline", 7)) {
 918                tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
 919                if (tl_tpg->tl_nexus) {
 920                        struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 921
 922                        core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
 923                }
 924                return count;
 925        }
 926        return -EINVAL;
 927}
 928
 929static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
 930                                         char *page)
 931{
 932        struct se_portal_group *se_tpg = to_tpg(item);
 933        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 934                        struct tcm_loop_tpg, tl_se_tpg);
 935        struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 936
 937        return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
 938                        tl_hba->sh->host_no, tl_tpg->tl_tpgt);
 939}
 940
 941CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
 942CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
 943CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 944
 945static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
 946        &tcm_loop_tpg_attr_nexus,
 947        &tcm_loop_tpg_attr_transport_status,
 948        &tcm_loop_tpg_attr_address,
 949        NULL,
 950};
 951
 952/* Start items for tcm_loop_naa_cit */
 953
 954static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
 955                                                     const char *name)
 956{
 957        struct tcm_loop_hba *tl_hba = container_of(wwn,
 958                        struct tcm_loop_hba, tl_hba_wwn);
 959        struct tcm_loop_tpg *tl_tpg;
 960        int ret;
 961        unsigned long tpgt;
 962
 963        if (strstr(name, "tpgt_") != name) {
 964                pr_err("Unable to locate \"tpgt_#\" directory group\n");
 965                return ERR_PTR(-EINVAL);
 966        }
 967        if (kstrtoul(name+5, 10, &tpgt))
 968                return ERR_PTR(-EINVAL);
 969
 970        if (tpgt >= TL_TPGS_PER_HBA) {
 971                pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
 972                       tpgt, TL_TPGS_PER_HBA);
 973                return ERR_PTR(-EINVAL);
 974        }
 975        tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
 976        tl_tpg->tl_hba = tl_hba;
 977        tl_tpg->tl_tpgt = tpgt;
 978        /*
 979         * Register the tl_tpg as a emulated TCM Target Endpoint
 980         */
 981        ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
 982        if (ret < 0)
 983                return ERR_PTR(-ENOMEM);
 984
 985        pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
 986                 tcm_loop_dump_proto_id(tl_hba),
 987                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
 988        return &tl_tpg->tl_se_tpg;
 989}
 990
 991static void tcm_loop_drop_naa_tpg(
 992        struct se_portal_group *se_tpg)
 993{
 994        struct se_wwn *wwn = se_tpg->se_tpg_wwn;
 995        struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
 996                                struct tcm_loop_tpg, tl_se_tpg);
 997        struct tcm_loop_hba *tl_hba;
 998        unsigned short tpgt;
 999
1000        tl_hba = tl_tpg->tl_hba;
1001        tpgt = tl_tpg->tl_tpgt;
1002        /*
1003         * Release the I_T Nexus for the Virtual target link if present
1004         */
1005        tcm_loop_drop_nexus(tl_tpg);
1006        /*
1007         * Deregister the tl_tpg as a emulated TCM Target Endpoint
1008         */
1009        core_tpg_deregister(se_tpg);
1010
1011        tl_tpg->tl_hba = NULL;
1012        tl_tpg->tl_tpgt = 0;
1013
1014        pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1015                 tcm_loop_dump_proto_id(tl_hba),
1016                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1017}
1018
1019/* End items for tcm_loop_naa_cit */
1020
1021/* Start items for tcm_loop_cit */
1022
1023static struct se_wwn *tcm_loop_make_scsi_hba(
1024        struct target_fabric_configfs *tf,
1025        struct config_group *group,
1026        const char *name)
1027{
1028        struct tcm_loop_hba *tl_hba;
1029        struct Scsi_Host *sh;
1030        char *ptr;
1031        int ret, off = 0;
1032
1033        tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1034        if (!tl_hba)
1035                return ERR_PTR(-ENOMEM);
1036
1037        /*
1038         * Determine the emulated Protocol Identifier and Target Port Name
1039         * based on the incoming configfs directory name.
1040         */
1041        ptr = strstr(name, "naa.");
1042        if (ptr) {
1043                tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1044                goto check_len;
1045        }
1046        ptr = strstr(name, "fc.");
1047        if (ptr) {
1048                tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1049                off = 3; /* Skip over "fc." */
1050                goto check_len;
1051        }
1052        ptr = strstr(name, "iqn.");
1053        if (!ptr) {
1054                pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1055                       name);
1056                ret = -EINVAL;
1057                goto out;
1058        }
1059        tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1060
1061check_len:
1062        if (strlen(name) >= TL_WWN_ADDR_LEN) {
1063                pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1064                       name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1065                ret = -EINVAL;
1066                goto out;
1067        }
1068        snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1069
1070        /*
1071         * Call device_register(tl_hba->dev) to register the emulated
1072         * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1073         * device_register() callbacks in tcm_loop_driver_probe()
1074         */
1075        ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1076        if (ret)
1077                goto out;
1078
1079        sh = tl_hba->sh;
1080        tcm_loop_hba_no_cnt++;
1081        pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1082                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1083        return &tl_hba->tl_hba_wwn;
1084out:
1085        kfree(tl_hba);
1086        return ERR_PTR(ret);
1087}
1088
1089static void tcm_loop_drop_scsi_hba(
1090        struct se_wwn *wwn)
1091{
1092        struct tcm_loop_hba *tl_hba = container_of(wwn,
1093                                struct tcm_loop_hba, tl_hba_wwn);
1094
1095        pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1096                 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1097                 tl_hba->sh->host_no);
1098        /*
1099         * Call device_unregister() on the original tl_hba->dev.
1100         * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1101         * release *tl_hba;
1102         */
1103        device_unregister(&tl_hba->dev);
1104}
1105
1106/* Start items for tcm_loop_cit */
1107static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1108{
1109        return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1110}
1111
1112CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1113
1114static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1115        &tcm_loop_wwn_attr_version,
1116        NULL,
1117};
1118
1119/* End items for tcm_loop_cit */
1120
1121static const struct target_core_fabric_ops loop_ops = {
1122        .module                         = THIS_MODULE,
1123        .fabric_name                    = "loopback",
1124        .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1125        .tpg_get_tag                    = tcm_loop_get_tag,
1126        .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1127        .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1128        .tpg_check_demo_mode_write_protect =
1129                                tcm_loop_check_demo_mode_write_protect,
1130        .tpg_check_prod_mode_write_protect =
1131                                tcm_loop_check_prod_mode_write_protect,
1132        .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1133        .tpg_get_inst_index             = tcm_loop_get_inst_index,
1134        .check_stop_free                = tcm_loop_check_stop_free,
1135        .release_cmd                    = tcm_loop_release_cmd,
1136        .sess_get_index                 = tcm_loop_sess_get_index,
1137        .write_pending                  = tcm_loop_write_pending,
1138        .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1139        .get_cmd_state                  = tcm_loop_get_cmd_state,
1140        .queue_data_in                  = tcm_loop_queue_data_in,
1141        .queue_status                   = tcm_loop_queue_status,
1142        .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1143        .aborted_task                   = tcm_loop_aborted_task,
1144        .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1145        .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1146        .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1147        .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1148        .fabric_post_link               = tcm_loop_port_link,
1149        .fabric_pre_unlink              = tcm_loop_port_unlink,
1150        .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1151        .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1152        .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1153};
1154
1155static int __init tcm_loop_fabric_init(void)
1156{
1157        int ret = -ENOMEM;
1158
1159        tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1160                                sizeof(struct tcm_loop_cmd),
1161                                __alignof__(struct tcm_loop_cmd),
1162                                0, NULL);
1163        if (!tcm_loop_cmd_cache) {
1164                pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1165                goto out;
1166        }
1167
1168        ret = tcm_loop_alloc_core_bus();
1169        if (ret)
1170                goto out_destroy_cache;
1171
1172        ret = target_register_template(&loop_ops);
1173        if (ret)
1174                goto out_release_core_bus;
1175
1176        return 0;
1177
1178out_release_core_bus:
1179        tcm_loop_release_core_bus();
1180out_destroy_cache:
1181        kmem_cache_destroy(tcm_loop_cmd_cache);
1182out:
1183        return ret;
1184}
1185
1186static void __exit tcm_loop_fabric_exit(void)
1187{
1188        target_unregister_template(&loop_ops);
1189        tcm_loop_release_core_bus();
1190        kmem_cache_destroy(tcm_loop_cmd_cache);
1191}
1192
1193MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1194MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1195MODULE_LICENSE("GPL");
1196module_init(tcm_loop_fabric_init);
1197module_exit(tcm_loop_fabric_exit);
1198