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0001 /*******************************************************************************
0002  *
0003  * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
0004  * for emulated SAS initiator ports
0005  *
0006  * © Copyright 2011-2013 Datera, Inc.
0007  *
0008  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
0009  *
0010  * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
0011  *
0012  * This program is free software; you can redistribute it and/or modify
0013  * it under the terms of the GNU General Public License as published by
0014  * the Free Software Foundation; either version 2 of the License, or
0015  * (at your option) any later version.
0016  *
0017  * This program is distributed in the hope that it will be useful,
0018  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0019  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0020  * GNU General Public License for more details.
0021  ****************************************************************************/
0022 
0023 #include <linux/module.h>
0024 #include <linux/moduleparam.h>
0025 #include <linux/init.h>
0026 #include <linux/slab.h>
0027 #include <linux/types.h>
0028 #include <linux/configfs.h>
0029 #include <scsi/scsi.h>
0030 #include <scsi/scsi_tcq.h>
0031 #include <scsi/scsi_host.h>
0032 #include <scsi/scsi_device.h>
0033 #include <scsi/scsi_cmnd.h>
0034 
0035 #include <target/target_core_base.h>
0036 #include <target/target_core_fabric.h>
0037 
0038 #include "tcm_loop.h"
0039 
0040 #define to_tcm_loop_hba(hba)    container_of(hba, struct tcm_loop_hba, dev)
0041 
0042 static struct kmem_cache *tcm_loop_cmd_cache;
0043 
0044 static int tcm_loop_hba_no_cnt;
0045 
0046 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
0047 
0048 static unsigned int tcm_loop_nr_hw_queues = 1;
0049 module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
0050 
0051 static unsigned int tcm_loop_can_queue = 1024;
0052 module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
0053 
0054 static unsigned int tcm_loop_cmd_per_lun = 1024;
0055 module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
0056 
0057 /*
0058  * Called from struct target_core_fabric_ops->check_stop_free()
0059  */
0060 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
0061 {
0062     return transport_generic_free_cmd(se_cmd, 0);
0063 }
0064 
0065 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
0066 {
0067     struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
0068                 struct tcm_loop_cmd, tl_se_cmd);
0069     struct scsi_cmnd *sc = tl_cmd->sc;
0070 
0071     if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
0072         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
0073     else
0074         scsi_done(sc);
0075 }
0076 
0077 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
0078 {
0079     seq_puts(m, "tcm_loop_proc_info()\n");
0080     return 0;
0081 }
0082 
0083 static int tcm_loop_driver_probe(struct device *);
0084 static void tcm_loop_driver_remove(struct device *);
0085 
0086 static int pseudo_lld_bus_match(struct device *dev,
0087                 struct device_driver *dev_driver)
0088 {
0089     return 1;
0090 }
0091 
0092 static struct bus_type tcm_loop_lld_bus = {
0093     .name           = "tcm_loop_bus",
0094     .match          = pseudo_lld_bus_match,
0095     .probe          = tcm_loop_driver_probe,
0096     .remove         = tcm_loop_driver_remove,
0097 };
0098 
0099 static struct device_driver tcm_loop_driverfs = {
0100     .name           = "tcm_loop",
0101     .bus            = &tcm_loop_lld_bus,
0102 };
0103 /*
0104  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
0105  */
0106 static struct device *tcm_loop_primary;
0107 
0108 static void tcm_loop_target_queue_cmd(struct tcm_loop_cmd *tl_cmd)
0109 {
0110     struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
0111     struct scsi_cmnd *sc = tl_cmd->sc;
0112     struct tcm_loop_nexus *tl_nexus;
0113     struct tcm_loop_hba *tl_hba;
0114     struct tcm_loop_tpg *tl_tpg;
0115     struct scatterlist *sgl_bidi = NULL;
0116     u32 sgl_bidi_count = 0, transfer_length;
0117 
0118     tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
0119     tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
0120 
0121     /*
0122      * Ensure that this tl_tpg reference from the incoming sc->device->id
0123      * has already been configured via tcm_loop_make_naa_tpg().
0124      */
0125     if (!tl_tpg->tl_hba) {
0126         set_host_byte(sc, DID_NO_CONNECT);
0127         goto out_done;
0128     }
0129     if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
0130         set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
0131         goto out_done;
0132     }
0133     tl_nexus = tl_tpg->tl_nexus;
0134     if (!tl_nexus) {
0135         scmd_printk(KERN_ERR, sc,
0136                 "TCM_Loop I_T Nexus does not exist\n");
0137         set_host_byte(sc, DID_ERROR);
0138         goto out_done;
0139     }
0140 
0141     transfer_length = scsi_transfer_length(sc);
0142     if (!scsi_prot_sg_count(sc) &&
0143         scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
0144         se_cmd->prot_pto = true;
0145         /*
0146          * loopback transport doesn't support
0147          * WRITE_GENERATE, READ_STRIP protection
0148          * information operations, go ahead unprotected.
0149          */
0150         transfer_length = scsi_bufflen(sc);
0151     }
0152 
0153     se_cmd->tag = tl_cmd->sc_cmd_tag;
0154     target_init_cmd(se_cmd, tl_nexus->se_sess, &tl_cmd->tl_sense_buf[0],
0155             tl_cmd->sc->device->lun, transfer_length,
0156             TCM_SIMPLE_TAG, sc->sc_data_direction, 0);
0157 
0158     if (target_submit_prep(se_cmd, sc->cmnd, scsi_sglist(sc),
0159                    scsi_sg_count(sc), sgl_bidi, sgl_bidi_count,
0160                    scsi_prot_sglist(sc), scsi_prot_sg_count(sc),
0161                    GFP_ATOMIC))
0162         return;
0163 
0164     target_queue_submission(se_cmd);
0165     return;
0166 
0167 out_done:
0168     scsi_done(sc);
0169 }
0170 
0171 /*
0172  * ->queuecommand can be and usually is called from interrupt context, so
0173  * defer the actual submission to a workqueue.
0174  */
0175 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
0176 {
0177     struct tcm_loop_cmd *tl_cmd = scsi_cmd_priv(sc);
0178 
0179     pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
0180          __func__, sc->device->host->host_no, sc->device->id,
0181          sc->device->channel, sc->device->lun, sc->cmnd[0],
0182          scsi_bufflen(sc));
0183 
0184     memset(tl_cmd, 0, sizeof(*tl_cmd));
0185     tl_cmd->sc = sc;
0186     tl_cmd->sc_cmd_tag = scsi_cmd_to_rq(sc)->tag;
0187 
0188     tcm_loop_target_queue_cmd(tl_cmd);
0189     return 0;
0190 }
0191 
0192 /*
0193  * Called from SCSI EH process context to issue a LUN_RESET TMR
0194  * to struct scsi_device
0195  */
0196 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
0197                   u64 lun, int task, enum tcm_tmreq_table tmr)
0198 {
0199     struct se_cmd *se_cmd;
0200     struct se_session *se_sess;
0201     struct tcm_loop_nexus *tl_nexus;
0202     struct tcm_loop_cmd *tl_cmd;
0203     int ret = TMR_FUNCTION_FAILED, rc;
0204 
0205     /*
0206      * Locate the tl_nexus and se_sess pointers
0207      */
0208     tl_nexus = tl_tpg->tl_nexus;
0209     if (!tl_nexus) {
0210         pr_err("Unable to perform device reset without active I_T Nexus\n");
0211         return ret;
0212     }
0213 
0214     tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
0215     if (!tl_cmd)
0216         return ret;
0217 
0218     init_completion(&tl_cmd->tmr_done);
0219 
0220     se_cmd = &tl_cmd->tl_se_cmd;
0221     se_sess = tl_tpg->tl_nexus->se_sess;
0222 
0223     rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
0224                    NULL, tmr, GFP_KERNEL, task,
0225                    TARGET_SCF_ACK_KREF);
0226     if (rc < 0)
0227         goto release;
0228     wait_for_completion(&tl_cmd->tmr_done);
0229     ret = se_cmd->se_tmr_req->response;
0230     target_put_sess_cmd(se_cmd);
0231 
0232 out:
0233     return ret;
0234 
0235 release:
0236     kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
0237     goto out;
0238 }
0239 
0240 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
0241 {
0242     struct tcm_loop_hba *tl_hba;
0243     struct tcm_loop_tpg *tl_tpg;
0244     int ret;
0245 
0246     /*
0247      * Locate the tcm_loop_hba_t pointer
0248      */
0249     tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
0250     tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
0251     ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
0252                  scsi_cmd_to_rq(sc)->tag, TMR_ABORT_TASK);
0253     return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
0254 }
0255 
0256 /*
0257  * Called from SCSI EH process context to issue a LUN_RESET TMR
0258  * to struct scsi_device
0259  */
0260 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
0261 {
0262     struct tcm_loop_hba *tl_hba;
0263     struct tcm_loop_tpg *tl_tpg;
0264     int ret;
0265 
0266     /*
0267      * Locate the tcm_loop_hba_t pointer
0268      */
0269     tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
0270     tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
0271 
0272     ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
0273                  0, TMR_LUN_RESET);
0274     return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
0275 }
0276 
0277 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
0278 {
0279     struct tcm_loop_hba *tl_hba;
0280     struct tcm_loop_tpg *tl_tpg;
0281 
0282     /*
0283      * Locate the tcm_loop_hba_t pointer
0284      */
0285     tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
0286     if (!tl_hba) {
0287         pr_err("Unable to perform device reset without active I_T Nexus\n");
0288         return FAILED;
0289     }
0290     /*
0291      * Locate the tl_tpg pointer from TargetID in sc->device->id
0292      */
0293     tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
0294     if (tl_tpg) {
0295         tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
0296         return SUCCESS;
0297     }
0298     return FAILED;
0299 }
0300 
0301 static struct scsi_host_template tcm_loop_driver_template = {
0302     .show_info      = tcm_loop_show_info,
0303     .proc_name      = "tcm_loopback",
0304     .name           = "TCM_Loopback",
0305     .queuecommand       = tcm_loop_queuecommand,
0306     .change_queue_depth = scsi_change_queue_depth,
0307     .eh_abort_handler = tcm_loop_abort_task,
0308     .eh_device_reset_handler = tcm_loop_device_reset,
0309     .eh_target_reset_handler = tcm_loop_target_reset,
0310     .this_id        = -1,
0311     .sg_tablesize       = 256,
0312     .max_sectors        = 0xFFFF,
0313     .dma_boundary       = PAGE_SIZE - 1,
0314     .module         = THIS_MODULE,
0315     .track_queue_depth  = 1,
0316     .cmd_size       = sizeof(struct tcm_loop_cmd),
0317 };
0318 
0319 static int tcm_loop_driver_probe(struct device *dev)
0320 {
0321     struct tcm_loop_hba *tl_hba;
0322     struct Scsi_Host *sh;
0323     int error, host_prot;
0324 
0325     tl_hba = to_tcm_loop_hba(dev);
0326 
0327     sh = scsi_host_alloc(&tcm_loop_driver_template,
0328             sizeof(struct tcm_loop_hba));
0329     if (!sh) {
0330         pr_err("Unable to allocate struct scsi_host\n");
0331         return -ENODEV;
0332     }
0333     tl_hba->sh = sh;
0334 
0335     /*
0336      * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
0337      */
0338     *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
0339     /*
0340      * Setup single ID, Channel and LUN for now..
0341      */
0342     sh->max_id = 2;
0343     sh->max_lun = 0;
0344     sh->max_channel = 0;
0345     sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
0346     sh->nr_hw_queues = tcm_loop_nr_hw_queues;
0347     sh->can_queue = tcm_loop_can_queue;
0348     sh->cmd_per_lun = tcm_loop_cmd_per_lun;
0349 
0350     host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
0351             SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
0352             SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
0353 
0354     scsi_host_set_prot(sh, host_prot);
0355     scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
0356 
0357     error = scsi_add_host(sh, &tl_hba->dev);
0358     if (error) {
0359         pr_err("%s: scsi_add_host failed\n", __func__);
0360         scsi_host_put(sh);
0361         return -ENODEV;
0362     }
0363     return 0;
0364 }
0365 
0366 static void tcm_loop_driver_remove(struct device *dev)
0367 {
0368     struct tcm_loop_hba *tl_hba;
0369     struct Scsi_Host *sh;
0370 
0371     tl_hba = to_tcm_loop_hba(dev);
0372     sh = tl_hba->sh;
0373 
0374     scsi_remove_host(sh);
0375     scsi_host_put(sh);
0376 }
0377 
0378 static void tcm_loop_release_adapter(struct device *dev)
0379 {
0380     struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
0381 
0382     kfree(tl_hba);
0383 }
0384 
0385 /*
0386  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
0387  */
0388 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
0389 {
0390     int ret;
0391 
0392     tl_hba->dev.bus = &tcm_loop_lld_bus;
0393     tl_hba->dev.parent = tcm_loop_primary;
0394     tl_hba->dev.release = &tcm_loop_release_adapter;
0395     dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
0396 
0397     ret = device_register(&tl_hba->dev);
0398     if (ret) {
0399         pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
0400         return -ENODEV;
0401     }
0402 
0403     return 0;
0404 }
0405 
0406 /*
0407  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
0408  * tcm_loop SCSI bus.
0409  */
0410 static int tcm_loop_alloc_core_bus(void)
0411 {
0412     int ret;
0413 
0414     tcm_loop_primary = root_device_register("tcm_loop_0");
0415     if (IS_ERR(tcm_loop_primary)) {
0416         pr_err("Unable to allocate tcm_loop_primary\n");
0417         return PTR_ERR(tcm_loop_primary);
0418     }
0419 
0420     ret = bus_register(&tcm_loop_lld_bus);
0421     if (ret) {
0422         pr_err("bus_register() failed for tcm_loop_lld_bus\n");
0423         goto dev_unreg;
0424     }
0425 
0426     ret = driver_register(&tcm_loop_driverfs);
0427     if (ret) {
0428         pr_err("driver_register() failed for tcm_loop_driverfs\n");
0429         goto bus_unreg;
0430     }
0431 
0432     pr_debug("Initialized TCM Loop Core Bus\n");
0433     return ret;
0434 
0435 bus_unreg:
0436     bus_unregister(&tcm_loop_lld_bus);
0437 dev_unreg:
0438     root_device_unregister(tcm_loop_primary);
0439     return ret;
0440 }
0441 
0442 static void tcm_loop_release_core_bus(void)
0443 {
0444     driver_unregister(&tcm_loop_driverfs);
0445     bus_unregister(&tcm_loop_lld_bus);
0446     root_device_unregister(tcm_loop_primary);
0447 
0448     pr_debug("Releasing TCM Loop Core BUS\n");
0449 }
0450 
0451 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
0452 {
0453     return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
0454 }
0455 
0456 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
0457 {
0458     /*
0459      * Return the passed NAA identifier for the Target Port
0460      */
0461     return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
0462 }
0463 
0464 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
0465 {
0466     /*
0467      * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
0468      * to represent the SCSI Target Port.
0469      */
0470     return tl_tpg(se_tpg)->tl_tpgt;
0471 }
0472 
0473 /*
0474  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
0475  * based upon the incoming fabric dependent SCSI Initiator Port
0476  */
0477 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
0478 {
0479     return 1;
0480 }
0481 
0482 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
0483 {
0484     return 0;
0485 }
0486 
0487 /*
0488  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
0489  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
0490  */
0491 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
0492 {
0493     return 0;
0494 }
0495 
0496 /*
0497  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
0498  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
0499  * It has been added here as a nop for target_fabric_tf_ops_check()
0500  */
0501 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
0502 {
0503     return 0;
0504 }
0505 
0506 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
0507 {
0508     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
0509                            tl_se_tpg);
0510     return tl_tpg->tl_fabric_prot_type;
0511 }
0512 
0513 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
0514 {
0515     return 1;
0516 }
0517 
0518 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
0519 {
0520     return 1;
0521 }
0522 
0523 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
0524 {
0525     return;
0526 }
0527 
0528 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
0529 {
0530     struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
0531             struct tcm_loop_cmd, tl_se_cmd);
0532 
0533     return tl_cmd->sc_cmd_state;
0534 }
0535 
0536 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
0537 {
0538     /*
0539      * Since Linux/SCSI has already sent down a struct scsi_cmnd
0540      * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
0541      * memory, and memory has already been mapped to struct se_cmd->t_mem_list
0542      * format with transport_generic_map_mem_to_cmd().
0543      *
0544      * We now tell TCM to add this WRITE CDB directly into the TCM storage
0545      * object execution queue.
0546      */
0547     target_execute_cmd(se_cmd);
0548     return 0;
0549 }
0550 
0551 static int tcm_loop_queue_data_or_status(const char *func,
0552         struct se_cmd *se_cmd, u8 scsi_status)
0553 {
0554     struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
0555                 struct tcm_loop_cmd, tl_se_cmd);
0556     struct scsi_cmnd *sc = tl_cmd->sc;
0557 
0558     pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
0559          func, sc, sc->cmnd[0]);
0560 
0561     if (se_cmd->sense_buffer &&
0562        ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
0563         (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
0564 
0565         memcpy(sc->sense_buffer, se_cmd->sense_buffer,
0566                 SCSI_SENSE_BUFFERSIZE);
0567         sc->result = SAM_STAT_CHECK_CONDITION;
0568     } else
0569         sc->result = scsi_status;
0570 
0571     set_host_byte(sc, DID_OK);
0572     if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
0573         (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
0574         scsi_set_resid(sc, se_cmd->residual_count);
0575     return 0;
0576 }
0577 
0578 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
0579 {
0580     return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
0581 }
0582 
0583 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
0584 {
0585     return tcm_loop_queue_data_or_status(__func__,
0586                          se_cmd, se_cmd->scsi_status);
0587 }
0588 
0589 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
0590 {
0591     struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
0592                 struct tcm_loop_cmd, tl_se_cmd);
0593 
0594     /* Wake up tcm_loop_issue_tmr(). */
0595     complete(&tl_cmd->tmr_done);
0596 }
0597 
0598 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
0599 {
0600     return;
0601 }
0602 
0603 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
0604 {
0605     switch (tl_hba->tl_proto_id) {
0606     case SCSI_PROTOCOL_SAS:
0607         return "SAS";
0608     case SCSI_PROTOCOL_FCP:
0609         return "FCP";
0610     case SCSI_PROTOCOL_ISCSI:
0611         return "iSCSI";
0612     default:
0613         break;
0614     }
0615 
0616     return "Unknown";
0617 }
0618 
0619 /* Start items for tcm_loop_port_cit */
0620 
0621 static int tcm_loop_port_link(
0622     struct se_portal_group *se_tpg,
0623     struct se_lun *lun)
0624 {
0625     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0626                 struct tcm_loop_tpg, tl_se_tpg);
0627     struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
0628 
0629     atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
0630     /*
0631      * Add Linux/SCSI struct scsi_device by HCTL
0632      */
0633     scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
0634 
0635     pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
0636     return 0;
0637 }
0638 
0639 static void tcm_loop_port_unlink(
0640     struct se_portal_group *se_tpg,
0641     struct se_lun *se_lun)
0642 {
0643     struct scsi_device *sd;
0644     struct tcm_loop_hba *tl_hba;
0645     struct tcm_loop_tpg *tl_tpg;
0646 
0647     tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
0648     tl_hba = tl_tpg->tl_hba;
0649 
0650     sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
0651                 se_lun->unpacked_lun);
0652     if (!sd) {
0653         pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
0654                0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
0655         return;
0656     }
0657     /*
0658      * Remove Linux/SCSI struct scsi_device by HCTL
0659      */
0660     scsi_remove_device(sd);
0661     scsi_device_put(sd);
0662 
0663     atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
0664 
0665     pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
0666 }
0667 
0668 /* End items for tcm_loop_port_cit */
0669 
0670 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
0671         struct config_item *item, char *page)
0672 {
0673     struct se_portal_group *se_tpg = attrib_to_tpg(item);
0674     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
0675                            tl_se_tpg);
0676 
0677     return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
0678 }
0679 
0680 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
0681         struct config_item *item, const char *page, size_t count)
0682 {
0683     struct se_portal_group *se_tpg = attrib_to_tpg(item);
0684     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
0685                            tl_se_tpg);
0686     unsigned long val;
0687     int ret = kstrtoul(page, 0, &val);
0688 
0689     if (ret) {
0690         pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
0691         return ret;
0692     }
0693     if (val != 0 && val != 1 && val != 3) {
0694         pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
0695         return -EINVAL;
0696     }
0697     tl_tpg->tl_fabric_prot_type = val;
0698 
0699     return count;
0700 }
0701 
0702 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
0703 
0704 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
0705     &tcm_loop_tpg_attrib_attr_fabric_prot_type,
0706     NULL,
0707 };
0708 
0709 /* Start items for tcm_loop_nexus_cit */
0710 
0711 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
0712                   struct se_session *se_sess, void *p)
0713 {
0714     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0715                     struct tcm_loop_tpg, tl_se_tpg);
0716 
0717     tl_tpg->tl_nexus = p;
0718     return 0;
0719 }
0720 
0721 static int tcm_loop_make_nexus(
0722     struct tcm_loop_tpg *tl_tpg,
0723     const char *name)
0724 {
0725     struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
0726     struct tcm_loop_nexus *tl_nexus;
0727     int ret;
0728 
0729     if (tl_tpg->tl_nexus) {
0730         pr_debug("tl_tpg->tl_nexus already exists\n");
0731         return -EEXIST;
0732     }
0733 
0734     tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
0735     if (!tl_nexus)
0736         return -ENOMEM;
0737 
0738     tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
0739                     TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
0740                     name, tl_nexus, tcm_loop_alloc_sess_cb);
0741     if (IS_ERR(tl_nexus->se_sess)) {
0742         ret = PTR_ERR(tl_nexus->se_sess);
0743         kfree(tl_nexus);
0744         return ret;
0745     }
0746 
0747     pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
0748          tcm_loop_dump_proto_id(tl_hba), name);
0749     return 0;
0750 }
0751 
0752 static int tcm_loop_drop_nexus(
0753     struct tcm_loop_tpg *tpg)
0754 {
0755     struct se_session *se_sess;
0756     struct tcm_loop_nexus *tl_nexus;
0757 
0758     tl_nexus = tpg->tl_nexus;
0759     if (!tl_nexus)
0760         return -ENODEV;
0761 
0762     se_sess = tl_nexus->se_sess;
0763     if (!se_sess)
0764         return -ENODEV;
0765 
0766     if (atomic_read(&tpg->tl_tpg_port_count)) {
0767         pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
0768                atomic_read(&tpg->tl_tpg_port_count));
0769         return -EPERM;
0770     }
0771 
0772     pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
0773          tcm_loop_dump_proto_id(tpg->tl_hba),
0774          tl_nexus->se_sess->se_node_acl->initiatorname);
0775     /*
0776      * Release the SCSI I_T Nexus to the emulated Target Port
0777      */
0778     target_remove_session(se_sess);
0779     tpg->tl_nexus = NULL;
0780     kfree(tl_nexus);
0781     return 0;
0782 }
0783 
0784 /* End items for tcm_loop_nexus_cit */
0785 
0786 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
0787 {
0788     struct se_portal_group *se_tpg = to_tpg(item);
0789     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0790             struct tcm_loop_tpg, tl_se_tpg);
0791     struct tcm_loop_nexus *tl_nexus;
0792     ssize_t ret;
0793 
0794     tl_nexus = tl_tpg->tl_nexus;
0795     if (!tl_nexus)
0796         return -ENODEV;
0797 
0798     ret = snprintf(page, PAGE_SIZE, "%s\n",
0799         tl_nexus->se_sess->se_node_acl->initiatorname);
0800 
0801     return ret;
0802 }
0803 
0804 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
0805         const char *page, size_t count)
0806 {
0807     struct se_portal_group *se_tpg = to_tpg(item);
0808     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0809             struct tcm_loop_tpg, tl_se_tpg);
0810     struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
0811     unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
0812     int ret;
0813     /*
0814      * Shutdown the active I_T nexus if 'NULL' is passed..
0815      */
0816     if (!strncmp(page, "NULL", 4)) {
0817         ret = tcm_loop_drop_nexus(tl_tpg);
0818         return (!ret) ? count : ret;
0819     }
0820     /*
0821      * Otherwise make sure the passed virtual Initiator port WWN matches
0822      * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
0823      * tcm_loop_make_nexus()
0824      */
0825     if (strlen(page) >= TL_WWN_ADDR_LEN) {
0826         pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
0827                page, TL_WWN_ADDR_LEN);
0828         return -EINVAL;
0829     }
0830     snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
0831 
0832     ptr = strstr(i_port, "naa.");
0833     if (ptr) {
0834         if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
0835             pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
0836                    i_port, tcm_loop_dump_proto_id(tl_hba));
0837             return -EINVAL;
0838         }
0839         port_ptr = &i_port[0];
0840         goto check_newline;
0841     }
0842     ptr = strstr(i_port, "fc.");
0843     if (ptr) {
0844         if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
0845             pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
0846                    i_port, tcm_loop_dump_proto_id(tl_hba));
0847             return -EINVAL;
0848         }
0849         port_ptr = &i_port[3]; /* Skip over "fc." */
0850         goto check_newline;
0851     }
0852     ptr = strstr(i_port, "iqn.");
0853     if (ptr) {
0854         if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
0855             pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
0856                    i_port, tcm_loop_dump_proto_id(tl_hba));
0857             return -EINVAL;
0858         }
0859         port_ptr = &i_port[0];
0860         goto check_newline;
0861     }
0862     pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
0863            i_port);
0864     return -EINVAL;
0865     /*
0866      * Clear any trailing newline for the NAA WWN
0867      */
0868 check_newline:
0869     if (i_port[strlen(i_port)-1] == '\n')
0870         i_port[strlen(i_port)-1] = '\0';
0871 
0872     ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
0873     if (ret < 0)
0874         return ret;
0875 
0876     return count;
0877 }
0878 
0879 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
0880         char *page)
0881 {
0882     struct se_portal_group *se_tpg = to_tpg(item);
0883     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0884             struct tcm_loop_tpg, tl_se_tpg);
0885     const char *status = NULL;
0886     ssize_t ret = -EINVAL;
0887 
0888     switch (tl_tpg->tl_transport_status) {
0889     case TCM_TRANSPORT_ONLINE:
0890         status = "online";
0891         break;
0892     case TCM_TRANSPORT_OFFLINE:
0893         status = "offline";
0894         break;
0895     default:
0896         break;
0897     }
0898 
0899     if (status)
0900         ret = snprintf(page, PAGE_SIZE, "%s\n", status);
0901 
0902     return ret;
0903 }
0904 
0905 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
0906         const char *page, size_t count)
0907 {
0908     struct se_portal_group *se_tpg = to_tpg(item);
0909     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0910             struct tcm_loop_tpg, tl_se_tpg);
0911 
0912     if (!strncmp(page, "online", 6)) {
0913         tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
0914         return count;
0915     }
0916     if (!strncmp(page, "offline", 7)) {
0917         tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
0918         if (tl_tpg->tl_nexus) {
0919             struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
0920 
0921             core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
0922         }
0923         return count;
0924     }
0925     return -EINVAL;
0926 }
0927 
0928 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
0929                      char *page)
0930 {
0931     struct se_portal_group *se_tpg = to_tpg(item);
0932     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0933             struct tcm_loop_tpg, tl_se_tpg);
0934     struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
0935 
0936     return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
0937             tl_hba->sh->host_no, tl_tpg->tl_tpgt);
0938 }
0939 
0940 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
0941 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
0942 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
0943 
0944 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
0945     &tcm_loop_tpg_attr_nexus,
0946     &tcm_loop_tpg_attr_transport_status,
0947     &tcm_loop_tpg_attr_address,
0948     NULL,
0949 };
0950 
0951 /* Start items for tcm_loop_naa_cit */
0952 
0953 static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
0954                              const char *name)
0955 {
0956     struct tcm_loop_hba *tl_hba = container_of(wwn,
0957             struct tcm_loop_hba, tl_hba_wwn);
0958     struct tcm_loop_tpg *tl_tpg;
0959     int ret;
0960     unsigned long tpgt;
0961 
0962     if (strstr(name, "tpgt_") != name) {
0963         pr_err("Unable to locate \"tpgt_#\" directory group\n");
0964         return ERR_PTR(-EINVAL);
0965     }
0966     if (kstrtoul(name+5, 10, &tpgt))
0967         return ERR_PTR(-EINVAL);
0968 
0969     if (tpgt >= TL_TPGS_PER_HBA) {
0970         pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
0971                tpgt, TL_TPGS_PER_HBA);
0972         return ERR_PTR(-EINVAL);
0973     }
0974     tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
0975     tl_tpg->tl_hba = tl_hba;
0976     tl_tpg->tl_tpgt = tpgt;
0977     /*
0978      * Register the tl_tpg as a emulated TCM Target Endpoint
0979      */
0980     ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
0981     if (ret < 0)
0982         return ERR_PTR(-ENOMEM);
0983 
0984     pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
0985          tcm_loop_dump_proto_id(tl_hba),
0986          config_item_name(&wwn->wwn_group.cg_item), tpgt);
0987     return &tl_tpg->tl_se_tpg;
0988 }
0989 
0990 static void tcm_loop_drop_naa_tpg(
0991     struct se_portal_group *se_tpg)
0992 {
0993     struct se_wwn *wwn = se_tpg->se_tpg_wwn;
0994     struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
0995                 struct tcm_loop_tpg, tl_se_tpg);
0996     struct tcm_loop_hba *tl_hba;
0997     unsigned short tpgt;
0998 
0999     tl_hba = tl_tpg->tl_hba;
1000     tpgt = tl_tpg->tl_tpgt;
1001     /*
1002      * Release the I_T Nexus for the Virtual target link if present
1003      */
1004     tcm_loop_drop_nexus(tl_tpg);
1005     /*
1006      * Deregister the tl_tpg as a emulated TCM Target Endpoint
1007      */
1008     core_tpg_deregister(se_tpg);
1009 
1010     tl_tpg->tl_hba = NULL;
1011     tl_tpg->tl_tpgt = 0;
1012 
1013     pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1014          tcm_loop_dump_proto_id(tl_hba),
1015          config_item_name(&wwn->wwn_group.cg_item), tpgt);
1016 }
1017 
1018 /* End items for tcm_loop_naa_cit */
1019 
1020 /* Start items for tcm_loop_cit */
1021 
1022 static struct se_wwn *tcm_loop_make_scsi_hba(
1023     struct target_fabric_configfs *tf,
1024     struct config_group *group,
1025     const char *name)
1026 {
1027     struct tcm_loop_hba *tl_hba;
1028     struct Scsi_Host *sh;
1029     char *ptr;
1030     int ret, off = 0;
1031 
1032     tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1033     if (!tl_hba)
1034         return ERR_PTR(-ENOMEM);
1035 
1036     /*
1037      * Determine the emulated Protocol Identifier and Target Port Name
1038      * based on the incoming configfs directory name.
1039      */
1040     ptr = strstr(name, "naa.");
1041     if (ptr) {
1042         tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1043         goto check_len;
1044     }
1045     ptr = strstr(name, "fc.");
1046     if (ptr) {
1047         tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1048         off = 3; /* Skip over "fc." */
1049         goto check_len;
1050     }
1051     ptr = strstr(name, "iqn.");
1052     if (!ptr) {
1053         pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1054                name);
1055         ret = -EINVAL;
1056         goto out;
1057     }
1058     tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1059 
1060 check_len:
1061     if (strlen(name) >= TL_WWN_ADDR_LEN) {
1062         pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1063                name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1064         ret = -EINVAL;
1065         goto out;
1066     }
1067     snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1068 
1069     /*
1070      * Call device_register(tl_hba->dev) to register the emulated
1071      * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1072      * device_register() callbacks in tcm_loop_driver_probe()
1073      */
1074     ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1075     if (ret)
1076         goto out;
1077 
1078     sh = tl_hba->sh;
1079     tcm_loop_hba_no_cnt++;
1080     pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1081          tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1082     return &tl_hba->tl_hba_wwn;
1083 out:
1084     kfree(tl_hba);
1085     return ERR_PTR(ret);
1086 }
1087 
1088 static void tcm_loop_drop_scsi_hba(
1089     struct se_wwn *wwn)
1090 {
1091     struct tcm_loop_hba *tl_hba = container_of(wwn,
1092                 struct tcm_loop_hba, tl_hba_wwn);
1093 
1094     pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1095          tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1096          tl_hba->sh->host_no);
1097     /*
1098      * Call device_unregister() on the original tl_hba->dev.
1099      * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1100      * release *tl_hba;
1101      */
1102     device_unregister(&tl_hba->dev);
1103 }
1104 
1105 /* Start items for tcm_loop_cit */
1106 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1107 {
1108     return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1109 }
1110 
1111 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1112 
1113 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1114     &tcm_loop_wwn_attr_version,
1115     NULL,
1116 };
1117 
1118 /* End items for tcm_loop_cit */
1119 
1120 static const struct target_core_fabric_ops loop_ops = {
1121     .module             = THIS_MODULE,
1122     .fabric_name            = "loopback",
1123     .tpg_get_wwn            = tcm_loop_get_endpoint_wwn,
1124     .tpg_get_tag            = tcm_loop_get_tag,
1125     .tpg_check_demo_mode        = tcm_loop_check_demo_mode,
1126     .tpg_check_demo_mode_cache  = tcm_loop_check_demo_mode_cache,
1127     .tpg_check_demo_mode_write_protect =
1128                 tcm_loop_check_demo_mode_write_protect,
1129     .tpg_check_prod_mode_write_protect =
1130                 tcm_loop_check_prod_mode_write_protect,
1131     .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
1132     .tpg_get_inst_index     = tcm_loop_get_inst_index,
1133     .check_stop_free        = tcm_loop_check_stop_free,
1134     .release_cmd            = tcm_loop_release_cmd,
1135     .sess_get_index         = tcm_loop_sess_get_index,
1136     .write_pending          = tcm_loop_write_pending,
1137     .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1138     .get_cmd_state          = tcm_loop_get_cmd_state,
1139     .queue_data_in          = tcm_loop_queue_data_in,
1140     .queue_status           = tcm_loop_queue_status,
1141     .queue_tm_rsp           = tcm_loop_queue_tm_rsp,
1142     .aborted_task           = tcm_loop_aborted_task,
1143     .fabric_make_wwn        = tcm_loop_make_scsi_hba,
1144     .fabric_drop_wwn        = tcm_loop_drop_scsi_hba,
1145     .fabric_make_tpg        = tcm_loop_make_naa_tpg,
1146     .fabric_drop_tpg        = tcm_loop_drop_naa_tpg,
1147     .fabric_post_link       = tcm_loop_port_link,
1148     .fabric_pre_unlink      = tcm_loop_port_unlink,
1149     .tfc_wwn_attrs          = tcm_loop_wwn_attrs,
1150     .tfc_tpg_base_attrs     = tcm_loop_tpg_attrs,
1151     .tfc_tpg_attrib_attrs       = tcm_loop_tpg_attrib_attrs,
1152 };
1153 
1154 static int __init tcm_loop_fabric_init(void)
1155 {
1156     int ret = -ENOMEM;
1157 
1158     tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1159                 sizeof(struct tcm_loop_cmd),
1160                 __alignof__(struct tcm_loop_cmd),
1161                 0, NULL);
1162     if (!tcm_loop_cmd_cache) {
1163         pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1164         goto out;
1165     }
1166 
1167     ret = tcm_loop_alloc_core_bus();
1168     if (ret)
1169         goto out_destroy_cache;
1170 
1171     ret = target_register_template(&loop_ops);
1172     if (ret)
1173         goto out_release_core_bus;
1174 
1175     return 0;
1176 
1177 out_release_core_bus:
1178     tcm_loop_release_core_bus();
1179 out_destroy_cache:
1180     kmem_cache_destroy(tcm_loop_cmd_cache);
1181 out:
1182     return ret;
1183 }
1184 
1185 static void __exit tcm_loop_fabric_exit(void)
1186 {
1187     target_unregister_template(&loop_ops);
1188     tcm_loop_release_core_bus();
1189     kmem_cache_destroy(tcm_loop_cmd_cache);
1190 }
1191 
1192 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1193 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1194 MODULE_LICENSE("GPL");
1195 module_init(tcm_loop_fabric_init);
1196 module_exit(tcm_loop_fabric_exit);
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