Orange Pi5 kernel

/*******************************************************************************
 *
 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
 * for emulated SAS initiator ports
 *
 * © Copyright 2011-2013 Datera, Inc.
 *
 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
 *
 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/
 
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/configfs.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
 
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
 
#include "tcm_loop.h"
 
#define to_tcm_loop_hba(hba)	container_of(hba, struct tcm_loop_hba, dev)
 
static struct workqueue_struct *tcm_loop_workqueue;
static struct kmem_cache *tcm_loop_cmd_cache;
 
static int tcm_loop_hba_no_cnt;
 
static int tcm_loop_queue_status(struct se_cmd *se_cmd);
 
/*
 * Called from struct target_core_fabric_ops->check_stop_free()
 */
static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
{
<------>return transport_generic_free_cmd(se_cmd, 0);
}
 
static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
{
<------>struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
<------><------><------><------>struct tcm_loop_cmd, tl_se_cmd);
 
<------>kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
}
 
static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
{
<------>seq_puts(m, "tcm_loop_proc_info()\n");
<------>return 0;
}
 
static int tcm_loop_driver_probe(struct device *);
static int tcm_loop_driver_remove(struct device *);
 
static int pseudo_lld_bus_match(struct device *dev,
<------><------><------><------>struct device_driver *dev_driver)
{
<------>return 1;
}
 
static struct bus_type tcm_loop_lld_bus = {
<------>.name			= "tcm_loop_bus",
<------>.match			= pseudo_lld_bus_match,
<------>.probe			= tcm_loop_driver_probe,
<------>.remove			= tcm_loop_driver_remove,
};
 
static struct device_driver tcm_loop_driverfs = {
<------>.name			= "tcm_loop",
<------>.bus			= &tcm_loop_lld_bus,
};
/*
 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
 */
static struct device *tcm_loop_primary;
 
static void tcm_loop_submission_work(struct work_struct *work)
{
<------>struct tcm_loop_cmd *tl_cmd =
<------><------>container_of(work, struct tcm_loop_cmd, work);
<------>struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
<------>struct scsi_cmnd *sc = tl_cmd->sc;
<------>struct tcm_loop_nexus *tl_nexus;
<------>struct tcm_loop_hba *tl_hba;
<------>struct tcm_loop_tpg *tl_tpg;
<------>struct scatterlist *sgl_bidi = NULL;
<------>u32 sgl_bidi_count = 0, transfer_length;
<------>int rc;
 
<------>tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
<------>tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 
<------>/*
<------> * Ensure that this tl_tpg reference from the incoming sc->device->id
<------> * has already been configured via tcm_loop_make_naa_tpg().
<------> */
<------>if (!tl_tpg->tl_hba) {
<------><------>set_host_byte(sc, DID_NO_CONNECT);
<------><------>goto out_done;
<------>}
<------>if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
<------><------>set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
<------><------>goto out_done;
<------>}
<------>tl_nexus = tl_tpg->tl_nexus;
<------>if (!tl_nexus) {
<------><------>scmd_printk(KERN_ERR, sc,
<------><------><------>    "TCM_Loop I_T Nexus does not exist\n");
<------><------>set_host_byte(sc, DID_ERROR);
<------><------>goto out_done;
<------>}
 
<------>transfer_length = scsi_transfer_length(sc);
<------>if (!scsi_prot_sg_count(sc) &&
<------>    scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
<------><------>se_cmd->prot_pto = true;
<------><------>/*
<------><------> * loopback transport doesn't support
<------><------> * WRITE_GENERATE, READ_STRIP protection
<------><------> * information operations, go ahead unprotected.
<------><------> */
<------><------>transfer_length = scsi_bufflen(sc);
<------>}
 
<------>se_cmd->tag = tl_cmd->sc_cmd_tag;
<------>rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
<------><------><------>&tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
<------><------><------>transfer_length, TCM_SIMPLE_TAG,
<------><------><------>sc->sc_data_direction, 0,
<------><------><------>scsi_sglist(sc), scsi_sg_count(sc),
<------><------><------>sgl_bidi, sgl_bidi_count,
<------><------><------>scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
<------>if (rc < 0) {
<------><------>set_host_byte(sc, DID_NO_CONNECT);
<------><------>goto out_done;
<------>}
<------>return;
 
out_done:
<------>kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
<------>sc->scsi_done(sc);
}
 
/*
 * ->queuecommand can be and usually is called from interrupt context, so
 * defer the actual submission to a workqueue.
 */
static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
{
<------>struct tcm_loop_cmd *tl_cmd;
 
<------>pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
<------><------> __func__, sc->device->host->host_no, sc->device->id,
<------><------> sc->device->channel, sc->device->lun, sc->cmnd[0],
<------><------> scsi_bufflen(sc));
 
<------>tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
<------>if (!tl_cmd) {
<------><------>set_host_byte(sc, DID_ERROR);
<------><------>sc->scsi_done(sc);
<------><------>return 0;
<------>}
 
<------>tl_cmd->sc = sc;
<------>tl_cmd->sc_cmd_tag = sc->request->tag;
<------>INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
<------>queue_work(tcm_loop_workqueue, &tl_cmd->work);
<------>return 0;
}
 
/*
 * Called from SCSI EH process context to issue a LUN_RESET TMR
 * to struct scsi_device
 */
static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
<------><------><------>      u64 lun, int task, enum tcm_tmreq_table tmr)
{
<------>struct se_cmd *se_cmd;
<------>struct se_session *se_sess;
<------>struct tcm_loop_nexus *tl_nexus;
<------>struct tcm_loop_cmd *tl_cmd;
<------>int ret = TMR_FUNCTION_FAILED, rc;
 
<------>/*
<------> * Locate the tl_nexus and se_sess pointers
<------> */
<------>tl_nexus = tl_tpg->tl_nexus;
<------>if (!tl_nexus) {
<------><------>pr_err("Unable to perform device reset without active I_T Nexus\n");
<------><------>return ret;
<------>}
 
<------>tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
<------>if (!tl_cmd)
<------><------>return ret;
 
<------>init_completion(&tl_cmd->tmr_done);
 
<------>se_cmd = &tl_cmd->tl_se_cmd;
<------>se_sess = tl_tpg->tl_nexus->se_sess;
 
<------>rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
<------><------><------>       NULL, tmr, GFP_KERNEL, task,
<------><------><------>       TARGET_SCF_ACK_KREF);
<------>if (rc < 0)
<------><------>goto release;
<------>wait_for_completion(&tl_cmd->tmr_done);
<------>ret = se_cmd->se_tmr_req->response;
<------>target_put_sess_cmd(se_cmd);
 
out:
<------>return ret;
 
release:
<------>kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
<------>goto out;
}
 
static int tcm_loop_abort_task(struct scsi_cmnd *sc)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct tcm_loop_tpg *tl_tpg;
<------>int ret = FAILED;
 
<------>/*
<------> * Locate the tcm_loop_hba_t pointer
<------> */
<------>tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
<------>tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
<------>ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
<------><------><------><------> sc->request->tag, TMR_ABORT_TASK);
<------>return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
}
 
/*
 * Called from SCSI EH process context to issue a LUN_RESET TMR
 * to struct scsi_device
 */
static int tcm_loop_device_reset(struct scsi_cmnd *sc)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct tcm_loop_tpg *tl_tpg;
<------>int ret = FAILED;
 
<------>/*
<------> * Locate the tcm_loop_hba_t pointer
<------> */
<------>tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
<------>tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
 
<------>ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
<------><------><------><------> 0, TMR_LUN_RESET);
<------>return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
}
 
static int tcm_loop_target_reset(struct scsi_cmnd *sc)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct tcm_loop_tpg *tl_tpg;
 
<------>/*
<------> * Locate the tcm_loop_hba_t pointer
<------> */
<------>tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
<------>if (!tl_hba) {
<------><------>pr_err("Unable to perform device reset without active I_T Nexus\n");
<------><------>return FAILED;
<------>}
<------>/*
<------> * Locate the tl_tpg pointer from TargetID in sc->device->id
<------> */
<------>tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
<------>if (tl_tpg) {
<------><------>tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
<------><------>return SUCCESS;
<------>}
<------>return FAILED;
}
 
static struct scsi_host_template tcm_loop_driver_template = {
<------>.show_info		= tcm_loop_show_info,
<------>.proc_name		= "tcm_loopback",
<------>.name			= "TCM_Loopback",
<------>.queuecommand		= tcm_loop_queuecommand,
<------>.change_queue_depth	= scsi_change_queue_depth,
<------>.eh_abort_handler = tcm_loop_abort_task,
<------>.eh_device_reset_handler = tcm_loop_device_reset,
<------>.eh_target_reset_handler = tcm_loop_target_reset,
<------>.can_queue		= 1024,
<------>.this_id		= -1,
<------>.sg_tablesize		= 256,
<------>.cmd_per_lun		= 1024,
<------>.max_sectors		= 0xFFFF,
<------>.dma_boundary		= PAGE_SIZE - 1,
<------>.module			= THIS_MODULE,
<------>.track_queue_depth	= 1,
};
 
static int tcm_loop_driver_probe(struct device *dev)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct Scsi_Host *sh;
<------>int error, host_prot;
 
<------>tl_hba = to_tcm_loop_hba(dev);
 
<------>sh = scsi_host_alloc(&tcm_loop_driver_template,
<------><------><------>sizeof(struct tcm_loop_hba));
<------>if (!sh) {
<------><------>pr_err("Unable to allocate struct scsi_host\n");
<------><------>return -ENODEV;
<------>}
<------>tl_hba->sh = sh;
 
<------>/*
<------> * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
<------> */
<------>*((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
<------>/*
<------> * Setup single ID, Channel and LUN for now..
<------> */
<------>sh->max_id = 2;
<------>sh->max_lun = 0;
<------>sh->max_channel = 0;
<------>sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
 
<------>host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
<------><------>    SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
<------><------>    SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
 
<------>scsi_host_set_prot(sh, host_prot);
<------>scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
 
<------>error = scsi_add_host(sh, &tl_hba->dev);
<------>if (error) {
<------><------>pr_err("%s: scsi_add_host failed\n", __func__);
<------><------>scsi_host_put(sh);
<------><------>return -ENODEV;
<------>}
<------>return 0;
}
 
static int tcm_loop_driver_remove(struct device *dev)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct Scsi_Host *sh;
 
<------>tl_hba = to_tcm_loop_hba(dev);
<------>sh = tl_hba->sh;
 
<------>scsi_remove_host(sh);
<------>scsi_host_put(sh);
<------>return 0;
}
 
static void tcm_loop_release_adapter(struct device *dev)
{
<------>struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
 
<------>kfree(tl_hba);
}
 
/*
 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
 */
static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
{
<------>int ret;
 
<------>tl_hba->dev.bus = &tcm_loop_lld_bus;
<------>tl_hba->dev.parent = tcm_loop_primary;
<------>tl_hba->dev.release = &tcm_loop_release_adapter;
<------>dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
 
<------>ret = device_register(&tl_hba->dev);
<------>if (ret) {
<------><------>pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
<------><------>return -ENODEV;
<------>}
 
<------>return 0;
}
 
/*
 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
 * tcm_loop SCSI bus.
 */
static int tcm_loop_alloc_core_bus(void)
{
<------>int ret;
 
<------>tcm_loop_primary = root_device_register("tcm_loop_0");
<------>if (IS_ERR(tcm_loop_primary)) {
<------><------>pr_err("Unable to allocate tcm_loop_primary\n");
<------><------>return PTR_ERR(tcm_loop_primary);
<------>}
 
<------>ret = bus_register(&tcm_loop_lld_bus);
<------>if (ret) {
<------><------>pr_err("bus_register() failed for tcm_loop_lld_bus\n");
<------><------>goto dev_unreg;
<------>}
 
<------>ret = driver_register(&tcm_loop_driverfs);
<------>if (ret) {
<------><------>pr_err("driver_register() failed for tcm_loop_driverfs\n");
<------><------>goto bus_unreg;
<------>}
 
<------>pr_debug("Initialized TCM Loop Core Bus\n");
<------>return ret;
 
bus_unreg:
<------>bus_unregister(&tcm_loop_lld_bus);
dev_unreg:
<------>root_device_unregister(tcm_loop_primary);
<------>return ret;
}
 
static void tcm_loop_release_core_bus(void)
{
<------>driver_unregister(&tcm_loop_driverfs);
<------>bus_unregister(&tcm_loop_lld_bus);
<------>root_device_unregister(tcm_loop_primary);
 
<------>pr_debug("Releasing TCM Loop Core BUS\n");
}
 
static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
{
<------>return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
}
 
static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
{
<------>/*
<------> * Return the passed NAA identifier for the Target Port
<------> */
<------>return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
}
 
static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
{
<------>/*
<------> * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
<------> * to represent the SCSI Target Port.
<------> */
<------>return tl_tpg(se_tpg)->tl_tpgt;
}
 
/*
 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
 * based upon the incoming fabric dependent SCSI Initiator Port
 */
static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
{
<------>return 1;
}
 
static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
{
<------>return 0;
}
 
/*
 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
 */
static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
{
<------>return 0;
}
 
/*
 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
 * It has been added here as a nop for target_fabric_tf_ops_check()
 */
static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
{
<------>return 0;
}
 
static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
{
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
<------><------><------><------><------><------>   tl_se_tpg);
<------>return tl_tpg->tl_fabric_prot_type;
}
 
static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
{
<------>return 1;
}
 
static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
{
<------>return 1;
}
 
static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
{
<------>return;
}
 
static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
{
<------>struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
<------><------><------>struct tcm_loop_cmd, tl_se_cmd);
 
<------>return tl_cmd->sc_cmd_state;
}
 
static int tcm_loop_write_pending(struct se_cmd *se_cmd)
{
<------>/*
<------> * Since Linux/SCSI has already sent down a struct scsi_cmnd
<------> * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
<------> * memory, and memory has already been mapped to struct se_cmd->t_mem_list
<------> * format with transport_generic_map_mem_to_cmd().
<------> *
<------> * We now tell TCM to add this WRITE CDB directly into the TCM storage
<------> * object execution queue.
<------> */
<------>target_execute_cmd(se_cmd);
<------>return 0;
}
 
static int tcm_loop_queue_data_or_status(const char *func,
<------><------>struct se_cmd *se_cmd, u8 scsi_status)
{
<------>struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
<------><------><------><------>struct tcm_loop_cmd, tl_se_cmd);
<------>struct scsi_cmnd *sc = tl_cmd->sc;
 
<------>pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
<------><------> func, sc, sc->cmnd[0]);
 
<------>if (se_cmd->sense_buffer &&
<------>   ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
<------>    (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
 
<------><------>memcpy(sc->sense_buffer, se_cmd->sense_buffer,
<------><------><------><------>SCSI_SENSE_BUFFERSIZE);
<------><------>sc->result = SAM_STAT_CHECK_CONDITION;
<------><------>set_driver_byte(sc, DRIVER_SENSE);
<------>} else
<------><------>sc->result = scsi_status;
 
<------>set_host_byte(sc, DID_OK);
<------>if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
<------>    (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
<------><------>scsi_set_resid(sc, se_cmd->residual_count);
<------>sc->scsi_done(sc);
<------>return 0;
}
 
static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
{
<------>return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
}
 
static int tcm_loop_queue_status(struct se_cmd *se_cmd)
{
<------>return tcm_loop_queue_data_or_status(__func__,
<------><------><------><------><------>     se_cmd, se_cmd->scsi_status);
}
 
static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
{
<------>struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
<------><------><------><------>struct tcm_loop_cmd, tl_se_cmd);
 
<------>/* Wake up tcm_loop_issue_tmr(). */
<------>complete(&tl_cmd->tmr_done);
}
 
static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
{
<------>return;
}
 
static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
{
<------>switch (tl_hba->tl_proto_id) {
<------>case SCSI_PROTOCOL_SAS:
<------><------>return "SAS";
<------>case SCSI_PROTOCOL_FCP:
<------><------>return "FCP";
<------>case SCSI_PROTOCOL_ISCSI:
<------><------>return "iSCSI";
<------>default:
<------><------>break;
<------>}
 
<------>return "Unknown";
}
 
/* Start items for tcm_loop_port_cit */
 
static int tcm_loop_port_link(
<------>struct se_portal_group *se_tpg,
<------>struct se_lun *lun)
{
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 
<------>atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
<------>/*
<------> * Add Linux/SCSI struct scsi_device by HCTL
<------> */
<------>scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
 
<------>pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
<------>return 0;
}
 
static void tcm_loop_port_unlink(
<------>struct se_portal_group *se_tpg,
<------>struct se_lun *se_lun)
{
<------>struct scsi_device *sd;
<------>struct tcm_loop_hba *tl_hba;
<------>struct tcm_loop_tpg *tl_tpg;
 
<------>tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
<------>tl_hba = tl_tpg->tl_hba;
 
<------>sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
<------><------><------><------>se_lun->unpacked_lun);
<------>if (!sd) {
<------><------>pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
<------><------>       0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
<------><------>return;
<------>}
<------>/*
<------> * Remove Linux/SCSI struct scsi_device by HCTL
<------> */
<------>scsi_remove_device(sd);
<------>scsi_device_put(sd);
 
<------>atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
 
<------>pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
}
 
/* End items for tcm_loop_port_cit */
 
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
<------><------>struct config_item *item, char *page)
{
<------>struct se_portal_group *se_tpg = attrib_to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
<------><------><------><------><------><------>   tl_se_tpg);
 
<------>return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
}
 
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
<------><------>struct config_item *item, const char *page, size_t count)
{
<------>struct se_portal_group *se_tpg = attrib_to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
<------><------><------><------><------><------>   tl_se_tpg);
<------>unsigned long val;
<------>int ret = kstrtoul(page, 0, &val);
 
<------>if (ret) {
<------><------>pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
<------><------>return ret;
<------>}
<------>if (val != 0 && val != 1 && val != 3) {
<------><------>pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
<------><------>return -EINVAL;
<------>}
<------>tl_tpg->tl_fabric_prot_type = val;
 
<------>return count;
}
 
CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
 
static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
<------>&tcm_loop_tpg_attrib_attr_fabric_prot_type,
<------>NULL,
};
 
/* Start items for tcm_loop_nexus_cit */
 
static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
<------><------><------><------>  struct se_session *se_sess, void *p)
{
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------><------><------>struct tcm_loop_tpg, tl_se_tpg);
 
<------>tl_tpg->tl_nexus = p;
<------>return 0;
}
 
static int tcm_loop_make_nexus(
<------>struct tcm_loop_tpg *tl_tpg,
<------>const char *name)
{
<------>struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
<------>struct tcm_loop_nexus *tl_nexus;
<------>int ret;
 
<------>if (tl_tpg->tl_nexus) {
<------><------>pr_debug("tl_tpg->tl_nexus already exists\n");
<------><------>return -EEXIST;
<------>}
 
<------>tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
<------>if (!tl_nexus)
<------><------>return -ENOMEM;
 
<------>tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
<------><------><------><------><------>TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
<------><------><------><------><------>name, tl_nexus, tcm_loop_alloc_sess_cb);
<------>if (IS_ERR(tl_nexus->se_sess)) {
<------><------>ret = PTR_ERR(tl_nexus->se_sess);
<------><------>kfree(tl_nexus);
<------><------>return ret;
<------>}
 
<------>pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
<------><------> tcm_loop_dump_proto_id(tl_hba), name);
<------>return 0;
}
 
static int tcm_loop_drop_nexus(
<------>struct tcm_loop_tpg *tpg)
{
<------>struct se_session *se_sess;
<------>struct tcm_loop_nexus *tl_nexus;
 
<------>tl_nexus = tpg->tl_nexus;
<------>if (!tl_nexus)
<------><------>return -ENODEV;
 
<------>se_sess = tl_nexus->se_sess;
<------>if (!se_sess)
<------><------>return -ENODEV;
 
<------>if (atomic_read(&tpg->tl_tpg_port_count)) {
<------><------>pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
<------><------>       atomic_read(&tpg->tl_tpg_port_count));
<------><------>return -EPERM;
<------>}
 
<------>pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
<------><------> tcm_loop_dump_proto_id(tpg->tl_hba),
<------><------> tl_nexus->se_sess->se_node_acl->initiatorname);
<------>/*
<------> * Release the SCSI I_T Nexus to the emulated Target Port
<------> */
<------>target_remove_session(se_sess);
<------>tpg->tl_nexus = NULL;
<------>kfree(tl_nexus);
<------>return 0;
}
 
/* End items for tcm_loop_nexus_cit */
 
static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
{
<------>struct se_portal_group *se_tpg = to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>struct tcm_loop_nexus *tl_nexus;
<------>ssize_t ret;
 
<------>tl_nexus = tl_tpg->tl_nexus;
<------>if (!tl_nexus)
<------><------>return -ENODEV;
 
<------>ret = snprintf(page, PAGE_SIZE, "%s\n",
<------><------>tl_nexus->se_sess->se_node_acl->initiatorname);
 
<------>return ret;
}
 
static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
<------><------>const char *page, size_t count)
{
<------>struct se_portal_group *se_tpg = to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
<------>unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
<------>int ret;
<------>/*
<------> * Shutdown the active I_T nexus if 'NULL' is passed..
<------> */
<------>if (!strncmp(page, "NULL", 4)) {
<------><------>ret = tcm_loop_drop_nexus(tl_tpg);
<------><------>return (!ret) ? count : ret;
<------>}
<------>/*
<------> * Otherwise make sure the passed virtual Initiator port WWN matches
<------> * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
<------> * tcm_loop_make_nexus()
<------> */
<------>if (strlen(page) >= TL_WWN_ADDR_LEN) {
<------><------>pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
<------><------>       page, TL_WWN_ADDR_LEN);
<------><------>return -EINVAL;
<------>}
<------>snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
 
<------>ptr = strstr(i_port, "naa.");
<------>if (ptr) {
<------><------>if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
<------><------><------>pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
<------><------><------>       i_port, tcm_loop_dump_proto_id(tl_hba));
<------><------><------>return -EINVAL;
<------><------>}
<------><------>port_ptr = &i_port[0];
<------><------>goto check_newline;
<------>}
<------>ptr = strstr(i_port, "fc.");
<------>if (ptr) {
<------><------>if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
<------><------><------>pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
<------><------><------>       i_port, tcm_loop_dump_proto_id(tl_hba));
<------><------><------>return -EINVAL;
<------><------>}
<------><------>port_ptr = &i_port[3]; /* Skip over "fc." */
<------><------>goto check_newline;
<------>}
<------>ptr = strstr(i_port, "iqn.");
<------>if (ptr) {
<------><------>if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
<------><------><------>pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
<------><------><------>       i_port, tcm_loop_dump_proto_id(tl_hba));
<------><------><------>return -EINVAL;
<------><------>}
<------><------>port_ptr = &i_port[0];
<------><------>goto check_newline;
<------>}
<------>pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
<------>       i_port);
<------>return -EINVAL;
<------>/*
<------> * Clear any trailing newline for the NAA WWN
<------> */
check_newline:
<------>if (i_port[strlen(i_port)-1] == '\n')
<------><------>i_port[strlen(i_port)-1] = '\0';
 
<------>ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
<------>if (ret < 0)
<------><------>return ret;
 
<------>return count;
}
 
static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
<------><------>char *page)
{
<------>struct se_portal_group *se_tpg = to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>const char *status = NULL;
<------>ssize_t ret = -EINVAL;
 
<------>switch (tl_tpg->tl_transport_status) {
<------>case TCM_TRANSPORT_ONLINE:
<------><------>status = "online";
<------><------>break;
<------>case TCM_TRANSPORT_OFFLINE:
<------><------>status = "offline";
<------><------>break;
<------>default:
<------><------>break;
<------>}
 
<------>if (status)
<------><------>ret = snprintf(page, PAGE_SIZE, "%s\n", status);
 
<------>return ret;
}
 
static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
<------><------>const char *page, size_t count)
{
<------>struct se_portal_group *se_tpg = to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------>struct tcm_loop_tpg, tl_se_tpg);
 
<------>if (!strncmp(page, "online", 6)) {
<------><------>tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
<------><------>return count;
<------>}
<------>if (!strncmp(page, "offline", 7)) {
<------><------>tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
<------><------>if (tl_tpg->tl_nexus) {
<------><------><------>struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
 
<------><------><------>core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
<------><------>}
<------><------>return count;
<------>}
<------>return -EINVAL;
}
 
static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
<------><------><------><------><------> char *page)
{
<------>struct se_portal_group *se_tpg = to_tpg(item);
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
 
<------>return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
<------><------><------>tl_hba->sh->host_no, tl_tpg->tl_tpgt);
}
 
CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
 
static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
<------>&tcm_loop_tpg_attr_nexus,
<------>&tcm_loop_tpg_attr_transport_status,
<------>&tcm_loop_tpg_attr_address,
<------>NULL,
};
 
/* Start items for tcm_loop_naa_cit */
 
static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
<------><------><------><------><------><------>     const char *name)
{
<------>struct tcm_loop_hba *tl_hba = container_of(wwn,
<------><------><------>struct tcm_loop_hba, tl_hba_wwn);
<------>struct tcm_loop_tpg *tl_tpg;
<------>int ret;
<------>unsigned long tpgt;
 
<------>if (strstr(name, "tpgt_") != name) {
<------><------>pr_err("Unable to locate \"tpgt_#\" directory group\n");
<------><------>return ERR_PTR(-EINVAL);
<------>}
<------>if (kstrtoul(name+5, 10, &tpgt))
<------><------>return ERR_PTR(-EINVAL);
 
<------>if (tpgt >= TL_TPGS_PER_HBA) {
<------><------>pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
<------><------>       tpgt, TL_TPGS_PER_HBA);
<------><------>return ERR_PTR(-EINVAL);
<------>}
<------>tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
<------>tl_tpg->tl_hba = tl_hba;
<------>tl_tpg->tl_tpgt = tpgt;
<------>/*
<------> * Register the tl_tpg as a emulated TCM Target Endpoint
<------> */
<------>ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
<------>if (ret < 0)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
<------><------> tcm_loop_dump_proto_id(tl_hba),
<------><------> config_item_name(&wwn->wwn_group.cg_item), tpgt);
<------>return &tl_tpg->tl_se_tpg;
}
 
static void tcm_loop_drop_naa_tpg(
<------>struct se_portal_group *se_tpg)
{
<------>struct se_wwn *wwn = se_tpg->se_tpg_wwn;
<------>struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
<------><------><------><------>struct tcm_loop_tpg, tl_se_tpg);
<------>struct tcm_loop_hba *tl_hba;
<------>unsigned short tpgt;
 
<------>tl_hba = tl_tpg->tl_hba;
<------>tpgt = tl_tpg->tl_tpgt;
<------>/*
<------> * Release the I_T Nexus for the Virtual target link if present
<------> */
<------>tcm_loop_drop_nexus(tl_tpg);
<------>/*
<------> * Deregister the tl_tpg as a emulated TCM Target Endpoint
<------> */
<------>core_tpg_deregister(se_tpg);
 
<------>tl_tpg->tl_hba = NULL;
<------>tl_tpg->tl_tpgt = 0;
 
<------>pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
<------><------> tcm_loop_dump_proto_id(tl_hba),
<------><------> config_item_name(&wwn->wwn_group.cg_item), tpgt);
}
 
/* End items for tcm_loop_naa_cit */
 
/* Start items for tcm_loop_cit */
 
static struct se_wwn *tcm_loop_make_scsi_hba(
<------>struct target_fabric_configfs *tf,
<------>struct config_group *group,
<------>const char *name)
{
<------>struct tcm_loop_hba *tl_hba;
<------>struct Scsi_Host *sh;
<------>char *ptr;
<------>int ret, off = 0;
 
<------>tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
<------>if (!tl_hba)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>/*
<------> * Determine the emulated Protocol Identifier and Target Port Name
<------> * based on the incoming configfs directory name.
<------> */
<------>ptr = strstr(name, "naa.");
<------>if (ptr) {
<------><------>tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
<------><------>goto check_len;
<------>}
<------>ptr = strstr(name, "fc.");
<------>if (ptr) {
<------><------>tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
<------><------>off = 3; /* Skip over "fc." */
<------><------>goto check_len;
<------>}
<------>ptr = strstr(name, "iqn.");
<------>if (!ptr) {
<------><------>pr_err("Unable to locate prefix for emulated Target Port: %s\n",
<------><------>       name);
<------><------>ret = -EINVAL;
<------><------>goto out;
<------>}
<------>tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
 
check_len:
<------>if (strlen(name) >= TL_WWN_ADDR_LEN) {
<------><------>pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
<------><------>       name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
<------><------>ret = -EINVAL;
<------><------>goto out;
<------>}
<------>snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
 
<------>/*
<------> * Call device_register(tl_hba->dev) to register the emulated
<------> * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
<------> * device_register() callbacks in tcm_loop_driver_probe()
<------> */
<------>ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
<------>if (ret)
<------><------>goto out;
 
<------>sh = tl_hba->sh;
<------>tcm_loop_hba_no_cnt++;
<------>pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
<------><------> tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
<------>return &tl_hba->tl_hba_wwn;
out:
<------>kfree(tl_hba);
<------>return ERR_PTR(ret);
}
 
static void tcm_loop_drop_scsi_hba(
<------>struct se_wwn *wwn)
{
<------>struct tcm_loop_hba *tl_hba = container_of(wwn,
<------><------><------><------>struct tcm_loop_hba, tl_hba_wwn);
 
<------>pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
<------><------> tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
<------><------> tl_hba->sh->host_no);
<------>/*
<------> * Call device_unregister() on the original tl_hba->dev.
<------> * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
<------> * release *tl_hba;
<------> */
<------>device_unregister(&tl_hba->dev);
}
 
/* Start items for tcm_loop_cit */
static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
{
<------>return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
}
 
CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
 
static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
<------>&tcm_loop_wwn_attr_version,
<------>NULL,
};
 
/* End items for tcm_loop_cit */
 
static const struct target_core_fabric_ops loop_ops = {
<------>.module				= THIS_MODULE,
<------>.fabric_name			= "loopback",
<------>.tpg_get_wwn			= tcm_loop_get_endpoint_wwn,
<------>.tpg_get_tag			= tcm_loop_get_tag,
<------>.tpg_check_demo_mode		= tcm_loop_check_demo_mode,
<------>.tpg_check_demo_mode_cache	= tcm_loop_check_demo_mode_cache,
<------>.tpg_check_demo_mode_write_protect =
<------><------><------><------>tcm_loop_check_demo_mode_write_protect,
<------>.tpg_check_prod_mode_write_protect =
<------><------><------><------>tcm_loop_check_prod_mode_write_protect,
<------>.tpg_check_prot_fabric_only	= tcm_loop_check_prot_fabric_only,
<------>.tpg_get_inst_index		= tcm_loop_get_inst_index,
<------>.check_stop_free		= tcm_loop_check_stop_free,
<------>.release_cmd			= tcm_loop_release_cmd,
<------>.sess_get_index			= tcm_loop_sess_get_index,
<------>.write_pending			= tcm_loop_write_pending,
<------>.set_default_node_attributes	= tcm_loop_set_default_node_attributes,
<------>.get_cmd_state			= tcm_loop_get_cmd_state,
<------>.queue_data_in			= tcm_loop_queue_data_in,
<------>.queue_status			= tcm_loop_queue_status,
<------>.queue_tm_rsp			= tcm_loop_queue_tm_rsp,
<------>.aborted_task			= tcm_loop_aborted_task,
<------>.fabric_make_wwn		= tcm_loop_make_scsi_hba,
<------>.fabric_drop_wwn		= tcm_loop_drop_scsi_hba,
<------>.fabric_make_tpg		= tcm_loop_make_naa_tpg,
<------>.fabric_drop_tpg		= tcm_loop_drop_naa_tpg,
<------>.fabric_post_link		= tcm_loop_port_link,
<------>.fabric_pre_unlink		= tcm_loop_port_unlink,
<------>.tfc_wwn_attrs			= tcm_loop_wwn_attrs,
<------>.tfc_tpg_base_attrs		= tcm_loop_tpg_attrs,
<------>.tfc_tpg_attrib_attrs		= tcm_loop_tpg_attrib_attrs,
};
 
static int __init tcm_loop_fabric_init(void)
{
<------>int ret = -ENOMEM;
 
<------>tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
<------>if (!tcm_loop_workqueue)
<------><------>goto out;
 
<------>tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
<------><------><------><------>sizeof(struct tcm_loop_cmd),
<------><------><------><------>__alignof__(struct tcm_loop_cmd),
<------><------><------><------>0, NULL);
<------>if (!tcm_loop_cmd_cache) {
<------><------>pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
<------><------>goto out_destroy_workqueue;
<------>}
 
<------>ret = tcm_loop_alloc_core_bus();
<------>if (ret)
<------><------>goto out_destroy_cache;
 
<------>ret = target_register_template(&loop_ops);
<------>if (ret)
<------><------>goto out_release_core_bus;
 
<------>return 0;
 
out_release_core_bus:
<------>tcm_loop_release_core_bus();
out_destroy_cache:
<------>kmem_cache_destroy(tcm_loop_cmd_cache);
out_destroy_workqueue:
<------>destroy_workqueue(tcm_loop_workqueue);
out:
<------>return ret;
}
 
static void __exit tcm_loop_fabric_exit(void)
{
<------>target_unregister_template(&loop_ops);
<------>tcm_loop_release_core_bus();
<------>kmem_cache_destroy(tcm_loop_cmd_cache);
<------>destroy_workqueue(tcm_loop_workqueue);
}
 
MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
MODULE_LICENSE("GPL");
module_init(tcm_loop_fabric_init);
module_exit(tcm_loop_fabric_exit);