/*******************************************************************************
 * Filename:  target_core_stat.c
 *
 * Modern ConfigFS group context specific statistics based on original
 * target_core_mib.c code
 *
 * (c) Copyright 2006-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/configfs.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include <target/configfs_macros.h>

#include "target_core_internal.h"

#ifndef INITIAL_JIFFIES
#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))
#endif

#define NONE            "None"
#define ISPRINT(a)   ((a >= ' ') && (a <= '~'))

#define SCSI_LU_INDEX                   1
#define LU_COUNT                        1

/*
 * SCSI Device Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_dev, se_dev_stat_grps);
#define DEV_STAT_SCSI_DEV_ATTR(_name, _mode)                            \
static struct target_stat_scsi_dev_attribute                            \
                        target_stat_scsi_dev_##_name =                  \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_dev_show_attr_##_name,                         \
        target_stat_scsi_dev_store_attr_##_name);

#define DEV_STAT_SCSI_DEV_ATTR_RO(_name)                                \
static struct target_stat_scsi_dev_attribute                            \
                        target_stat_scsi_dev_##_name =                  \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_dev_show_attr_##_name);

static ssize_t target_stat_scsi_dev_show_attr_inst(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        struct se_hba *hba = dev->se_hba;

        return snprintf(page, PAGE_SIZE, "%u\n", hba->hba_index);
}
DEV_STAT_SCSI_DEV_ATTR_RO(inst);

static ssize_t target_stat_scsi_dev_show_attr_indx(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        return snprintf(page, PAGE_SIZE, "%u\n", dev->dev_index);
}
DEV_STAT_SCSI_DEV_ATTR_RO(indx);

static ssize_t target_stat_scsi_dev_show_attr_role(
        struct se_dev_stat_grps *sgrps, char *page)
{
        return snprintf(page, PAGE_SIZE, "Target\n");
}
DEV_STAT_SCSI_DEV_ATTR_RO(role);

static ssize_t target_stat_scsi_dev_show_attr_ports(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        return snprintf(page, PAGE_SIZE, "%u\n", dev->export_count);
}
DEV_STAT_SCSI_DEV_ATTR_RO(ports);

CONFIGFS_EATTR_OPS(target_stat_scsi_dev, se_dev_stat_grps, scsi_dev_group);

static struct configfs_attribute *target_stat_scsi_dev_attrs[] = {
        &target_stat_scsi_dev_inst.attr,
        &target_stat_scsi_dev_indx.attr,
        &target_stat_scsi_dev_role.attr,
        &target_stat_scsi_dev_ports.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_dev_attrib_ops = {
        .show_attribute         = target_stat_scsi_dev_attr_show,
        .store_attribute        = target_stat_scsi_dev_attr_store,
};

static struct config_item_type target_stat_scsi_dev_cit = {
        .ct_item_ops            = &target_stat_scsi_dev_attrib_ops,
        .ct_attrs               = target_stat_scsi_dev_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Target Device Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_tgt_dev, se_dev_stat_grps);
#define DEV_STAT_SCSI_TGT_DEV_ATTR(_name, _mode)                        \
static struct target_stat_scsi_tgt_dev_attribute                        \
                        target_stat_scsi_tgt_dev_##_name =              \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_tgt_dev_show_attr_##_name,                     \
        target_stat_scsi_tgt_dev_store_attr_##_name);

#define DEV_STAT_SCSI_TGT_DEV_ATTR_RO(_name)                            \
static struct target_stat_scsi_tgt_dev_attribute                        \
                        target_stat_scsi_tgt_dev_##_name =              \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_tgt_dev_show_attr_##_name);

static ssize_t target_stat_scsi_tgt_dev_show_attr_inst(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        struct se_hba *hba = dev->se_hba;

        return snprintf(page, PAGE_SIZE, "%u\n", hba->hba_index);
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(inst);

static ssize_t target_stat_scsi_tgt_dev_show_attr_indx(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        return snprintf(page, PAGE_SIZE, "%u\n", dev->dev_index);
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(indx);

static ssize_t target_stat_scsi_tgt_dev_show_attr_num_lus(
        struct se_dev_stat_grps *sgrps, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", LU_COUNT);
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(num_lus);

static ssize_t target_stat_scsi_tgt_dev_show_attr_status(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        if (dev->export_count)
                return snprintf(page, PAGE_SIZE, "activated");
        else
                return snprintf(page, PAGE_SIZE, "deactivated");
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(status);

static ssize_t target_stat_scsi_tgt_dev_show_attr_non_access_lus(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        int non_accessible_lus;

        if (dev->export_count)
                non_accessible_lus = 0;
        else
                non_accessible_lus = 1;

        return snprintf(page, PAGE_SIZE, "%u\n", non_accessible_lus);
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(non_access_lus);

static ssize_t target_stat_scsi_tgt_dev_show_attr_resets(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&dev->num_resets));
}
DEV_STAT_SCSI_TGT_DEV_ATTR_RO(resets);


CONFIGFS_EATTR_OPS(target_stat_scsi_tgt_dev, se_dev_stat_grps, scsi_tgt_dev_group);

static struct configfs_attribute *target_stat_scsi_tgt_dev_attrs[] = {
        &target_stat_scsi_tgt_dev_inst.attr,
        &target_stat_scsi_tgt_dev_indx.attr,
        &target_stat_scsi_tgt_dev_num_lus.attr,
        &target_stat_scsi_tgt_dev_status.attr,
        &target_stat_scsi_tgt_dev_non_access_lus.attr,
        &target_stat_scsi_tgt_dev_resets.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_tgt_dev_attrib_ops = {
        .show_attribute         = target_stat_scsi_tgt_dev_attr_show,
        .store_attribute        = target_stat_scsi_tgt_dev_attr_store,
};

static struct config_item_type target_stat_scsi_tgt_dev_cit = {
        .ct_item_ops            = &target_stat_scsi_tgt_dev_attrib_ops,
        .ct_attrs               = target_stat_scsi_tgt_dev_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Logical Unit Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_lu, se_dev_stat_grps);
#define DEV_STAT_SCSI_LU_ATTR(_name, _mode)                             \
static struct target_stat_scsi_lu_attribute target_stat_scsi_lu_##_name = \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_lu_show_attr_##_name,                          \
        target_stat_scsi_lu_store_attr_##_name);

#define DEV_STAT_SCSI_LU_ATTR_RO(_name)                                 \
static struct target_stat_scsi_lu_attribute target_stat_scsi_lu_##_name = \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_lu_show_attr_##_name);

static ssize_t target_stat_scsi_lu_show_attr_inst(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        struct se_hba *hba = dev->se_hba;

        return snprintf(page, PAGE_SIZE, "%u\n", hba->hba_index);
}
DEV_STAT_SCSI_LU_ATTR_RO(inst);

static ssize_t target_stat_scsi_lu_show_attr_dev(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        return snprintf(page, PAGE_SIZE, "%u\n", dev->dev_index);
}
DEV_STAT_SCSI_LU_ATTR_RO(dev);

static ssize_t target_stat_scsi_lu_show_attr_indx(
        struct se_dev_stat_grps *sgrps, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", SCSI_LU_INDEX);
}
DEV_STAT_SCSI_LU_ATTR_RO(indx);

static ssize_t target_stat_scsi_lu_show_attr_lun(
        struct se_dev_stat_grps *sgrps, char *page)
{
        /* FIXME: scsiLuDefaultLun */
        return snprintf(page, PAGE_SIZE, "%llu\n", (unsigned long long)0);
}
DEV_STAT_SCSI_LU_ATTR_RO(lun);

static ssize_t target_stat_scsi_lu_show_attr_lu_name(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuWwnName */
        return snprintf(page, PAGE_SIZE, "%s\n",
                        (strlen(dev->t10_wwn.unit_serial)) ?
                        dev->t10_wwn.unit_serial : "None");
}
DEV_STAT_SCSI_LU_ATTR_RO(lu_name);

static ssize_t target_stat_scsi_lu_show_attr_vend(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        int i;
        char str[sizeof(dev->t10_wwn.vendor)+1];

        /* scsiLuVendorId */
        for (i = 0; i < sizeof(dev->t10_wwn.vendor); i++)
                str[i] = ISPRINT(dev->t10_wwn.vendor[i]) ?
                        dev->t10_wwn.vendor[i] : ' ';
        str[i] = '\0';
        return snprintf(page, PAGE_SIZE, "%s\n", str);
}
DEV_STAT_SCSI_LU_ATTR_RO(vend);

static ssize_t target_stat_scsi_lu_show_attr_prod(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        int i;
        char str[sizeof(dev->t10_wwn.model)+1];

        /* scsiLuProductId */
        for (i = 0; i < sizeof(dev->t10_wwn.vendor); i++)
                str[i] = ISPRINT(dev->t10_wwn.model[i]) ?
                        dev->t10_wwn.model[i] : ' ';
        str[i] = '\0';
        return snprintf(page, PAGE_SIZE, "%s\n", str);
}
DEV_STAT_SCSI_LU_ATTR_RO(prod);

static ssize_t target_stat_scsi_lu_show_attr_rev(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);
        int i;
        char str[sizeof(dev->t10_wwn.revision)+1];

        /* scsiLuRevisionId */
        for (i = 0; i < sizeof(dev->t10_wwn.revision); i++)
                str[i] = ISPRINT(dev->t10_wwn.revision[i]) ?
                        dev->t10_wwn.revision[i] : ' ';
        str[i] = '\0';
        return snprintf(page, PAGE_SIZE, "%s\n", str);
}
DEV_STAT_SCSI_LU_ATTR_RO(rev);

static ssize_t target_stat_scsi_lu_show_attr_dev_type(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuPeripheralType */
        return snprintf(page, PAGE_SIZE, "%u\n",
                        dev->transport->get_device_type(dev));
}
DEV_STAT_SCSI_LU_ATTR_RO(dev_type);

static ssize_t target_stat_scsi_lu_show_attr_status(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuStatus */
        return snprintf(page, PAGE_SIZE, "%s\n",
                (dev->export_count) ? "available" : "notavailable");
}
DEV_STAT_SCSI_LU_ATTR_RO(status);

static ssize_t target_stat_scsi_lu_show_attr_state_bit(
        struct se_dev_stat_grps *sgrps, char *page)
{
        /* scsiLuState */
        return snprintf(page, PAGE_SIZE, "exposed\n");
}
DEV_STAT_SCSI_LU_ATTR_RO(state_bit);

static ssize_t target_stat_scsi_lu_show_attr_num_cmds(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuNumCommands */
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&dev->num_cmds));
}
DEV_STAT_SCSI_LU_ATTR_RO(num_cmds);

static ssize_t target_stat_scsi_lu_show_attr_read_mbytes(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuReadMegaBytes */
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&dev->read_bytes) >> 20);
}
DEV_STAT_SCSI_LU_ATTR_RO(read_mbytes);

static ssize_t target_stat_scsi_lu_show_attr_write_mbytes(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuWrittenMegaBytes */
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&dev->write_bytes) >> 20);
}
DEV_STAT_SCSI_LU_ATTR_RO(write_mbytes);

static ssize_t target_stat_scsi_lu_show_attr_resets(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuInResets */
        return snprintf(page, PAGE_SIZE, "%lu\n", atomic_long_read(&dev->num_resets));
}
DEV_STAT_SCSI_LU_ATTR_RO(resets);

static ssize_t target_stat_scsi_lu_show_attr_full_stat(
        struct se_dev_stat_grps *sgrps, char *page)
{
        /* FIXME: scsiLuOutTaskSetFullStatus */
        return snprintf(page, PAGE_SIZE, "%u\n", 0);
}
DEV_STAT_SCSI_LU_ATTR_RO(full_stat);

static ssize_t target_stat_scsi_lu_show_attr_hs_num_cmds(
        struct se_dev_stat_grps *sgrps, char *page)
{
        /* FIXME: scsiLuHSInCommands */
        return snprintf(page, PAGE_SIZE, "%u\n", 0);
}
DEV_STAT_SCSI_LU_ATTR_RO(hs_num_cmds);

static ssize_t target_stat_scsi_lu_show_attr_creation_time(
        struct se_dev_stat_grps *sgrps, char *page)
{
        struct se_device *dev =
                container_of(sgrps, struct se_device, dev_stat_grps);

        /* scsiLuCreationTime */
        return snprintf(page, PAGE_SIZE, "%u\n", (u32)(((u32)dev->creation_time -
                                INITIAL_JIFFIES) * 100 / HZ));
}
DEV_STAT_SCSI_LU_ATTR_RO(creation_time);

CONFIGFS_EATTR_OPS(target_stat_scsi_lu, se_dev_stat_grps, scsi_lu_group);

static struct configfs_attribute *target_stat_scsi_lu_attrs[] = {
        &target_stat_scsi_lu_inst.attr,
        &target_stat_scsi_lu_dev.attr,
        &target_stat_scsi_lu_indx.attr,
        &target_stat_scsi_lu_lun.attr,
        &target_stat_scsi_lu_lu_name.attr,
        &target_stat_scsi_lu_vend.attr,
        &target_stat_scsi_lu_prod.attr,
        &target_stat_scsi_lu_rev.attr,
        &target_stat_scsi_lu_dev_type.attr,
        &target_stat_scsi_lu_status.attr,
        &target_stat_scsi_lu_state_bit.attr,
        &target_stat_scsi_lu_num_cmds.attr,
        &target_stat_scsi_lu_read_mbytes.attr,
        &target_stat_scsi_lu_write_mbytes.attr,
        &target_stat_scsi_lu_resets.attr,
        &target_stat_scsi_lu_full_stat.attr,
        &target_stat_scsi_lu_hs_num_cmds.attr,
        &target_stat_scsi_lu_creation_time.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_lu_attrib_ops = {
        .show_attribute         = target_stat_scsi_lu_attr_show,
        .store_attribute        = target_stat_scsi_lu_attr_store,
};

static struct config_item_type target_stat_scsi_lu_cit = {
        .ct_item_ops            = &target_stat_scsi_lu_attrib_ops,
        .ct_attrs               = target_stat_scsi_lu_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * Called from target_core_configfs.c:target_core_make_subdev() to setup
 * the target statistics groups + configfs CITs located in target_core_stat.c
 */
void target_stat_setup_dev_default_groups(struct se_device *dev)
{
        struct config_group *dev_stat_grp = &dev->dev_stat_grps.stat_group;

        config_group_init_type_name(&dev->dev_stat_grps.scsi_dev_group,
                        "scsi_dev", &target_stat_scsi_dev_cit);
        config_group_init_type_name(&dev->dev_stat_grps.scsi_tgt_dev_group,
                        "scsi_tgt_dev", &target_stat_scsi_tgt_dev_cit);
        config_group_init_type_name(&dev->dev_stat_grps.scsi_lu_group,
                        "scsi_lu", &target_stat_scsi_lu_cit);

        dev_stat_grp->default_groups[0] = &dev->dev_stat_grps.scsi_dev_group;
        dev_stat_grp->default_groups[1] = &dev->dev_stat_grps.scsi_tgt_dev_group;
        dev_stat_grp->default_groups[2] = &dev->dev_stat_grps.scsi_lu_group;
        dev_stat_grp->default_groups[3] = NULL;
}

/*
 * SCSI Port Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_port, se_port_stat_grps);
#define DEV_STAT_SCSI_PORT_ATTR(_name, _mode)                           \
static struct target_stat_scsi_port_attribute                           \
                        target_stat_scsi_port_##_name =                 \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_port_show_attr_##_name,                        \
        target_stat_scsi_port_store_attr_##_name);

#define DEV_STAT_SCSI_PORT_ATTR_RO(_name)                               \
static struct target_stat_scsi_port_attribute                           \
                        target_stat_scsi_port_##_name =                 \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_port_show_attr_##_name);

static ssize_t target_stat_scsi_port_show_attr_inst(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", dev->hba_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_PORT_ATTR_RO(inst);

static ssize_t target_stat_scsi_port_show_attr_dev(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", dev->dev_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_PORT_ATTR_RO(dev);

static ssize_t target_stat_scsi_port_show_attr_indx(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_rtpi);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_PORT_ATTR_RO(indx);

static ssize_t target_stat_scsi_port_show_attr_role(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%s%u\n", "Device", dev->dev_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_PORT_ATTR_RO(role);

static ssize_t target_stat_scsi_port_show_attr_busy_count(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev) {
                /* FIXME: scsiPortBusyStatuses  */
                ret = snprintf(page, PAGE_SIZE, "%u\n", 0);
        }
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_PORT_ATTR_RO(busy_count);

CONFIGFS_EATTR_OPS(target_stat_scsi_port, se_port_stat_grps, scsi_port_group);

static struct configfs_attribute *target_stat_scsi_port_attrs[] = {
        &target_stat_scsi_port_inst.attr,
        &target_stat_scsi_port_dev.attr,
        &target_stat_scsi_port_indx.attr,
        &target_stat_scsi_port_role.attr,
        &target_stat_scsi_port_busy_count.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_port_attrib_ops = {
        .show_attribute         = target_stat_scsi_port_attr_show,
        .store_attribute        = target_stat_scsi_port_attr_store,
};

static struct config_item_type target_stat_scsi_port_cit = {
        .ct_item_ops            = &target_stat_scsi_port_attrib_ops,
        .ct_attrs               = target_stat_scsi_port_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Target Port Table
 */
CONFIGFS_EATTR_STRUCT(target_stat_scsi_tgt_port, se_port_stat_grps);
#define DEV_STAT_SCSI_TGT_PORT_ATTR(_name, _mode)                       \
static struct target_stat_scsi_tgt_port_attribute                       \
                        target_stat_scsi_tgt_port_##_name =             \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_tgt_port_show_attr_##_name,                    \
        target_stat_scsi_tgt_port_store_attr_##_name);

#define DEV_STAT_SCSI_TGT_PORT_ATTR_RO(_name)                           \
static struct target_stat_scsi_tgt_port_attribute                       \
                        target_stat_scsi_tgt_port_##_name =             \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_tgt_port_show_attr_##_name);

static ssize_t target_stat_scsi_tgt_port_show_attr_inst(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", dev->hba_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(inst);

static ssize_t target_stat_scsi_tgt_port_show_attr_dev(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", dev->dev_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(dev);

static ssize_t target_stat_scsi_tgt_port_show_attr_indx(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_rtpi);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(indx);

static ssize_t target_stat_scsi_tgt_port_show_attr_name(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_portal_group *tpg = lun->lun_tpg;
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%sPort#%u\n",
                        tpg->se_tpg_tfo->get_fabric_name(),
                        lun->lun_rtpi);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(name);

static ssize_t target_stat_scsi_tgt_port_show_attr_port_index(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_portal_group *tpg = lun->lun_tpg;
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%s%s%d\n",
                        tpg->se_tpg_tfo->tpg_get_wwn(tpg), "+t+",
                        tpg->se_tpg_tfo->tpg_get_tag(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(port_index);

static ssize_t target_stat_scsi_tgt_port_show_attr_in_cmds(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%lu\n",
                               atomic_long_read(&lun->lun_stats.cmd_pdus));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(in_cmds);

static ssize_t target_stat_scsi_tgt_port_show_attr_write_mbytes(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n",
                        (u32)(atomic_long_read(&lun->lun_stats.rx_data_octets) >> 20));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(write_mbytes);

static ssize_t target_stat_scsi_tgt_port_show_attr_read_mbytes(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n",
                                (u32)(atomic_long_read(&lun->lun_stats.tx_data_octets) >> 20));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(read_mbytes);

static ssize_t target_stat_scsi_tgt_port_show_attr_hs_in_cmds(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev) {
                /* FIXME: scsiTgtPortHsInCommands */
                ret = snprintf(page, PAGE_SIZE, "%u\n", 0);
        }
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TGT_PORT_ATTR_RO(hs_in_cmds);

CONFIGFS_EATTR_OPS(target_stat_scsi_tgt_port, se_port_stat_grps,
                scsi_tgt_port_group);

static struct configfs_attribute *target_stat_scsi_tgt_port_attrs[] = {
        &target_stat_scsi_tgt_port_inst.attr,
        &target_stat_scsi_tgt_port_dev.attr,
        &target_stat_scsi_tgt_port_indx.attr,
        &target_stat_scsi_tgt_port_name.attr,
        &target_stat_scsi_tgt_port_port_index.attr,
        &target_stat_scsi_tgt_port_in_cmds.attr,
        &target_stat_scsi_tgt_port_write_mbytes.attr,
        &target_stat_scsi_tgt_port_read_mbytes.attr,
        &target_stat_scsi_tgt_port_hs_in_cmds.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_tgt_port_attrib_ops = {
        .show_attribute         = target_stat_scsi_tgt_port_attr_show,
        .store_attribute        = target_stat_scsi_tgt_port_attr_store,
};

static struct config_item_type target_stat_scsi_tgt_port_cit = {
        .ct_item_ops            = &target_stat_scsi_tgt_port_attrib_ops,
        .ct_attrs               = target_stat_scsi_tgt_port_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Transport Table
o */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_transport, se_port_stat_grps);
#define DEV_STAT_SCSI_TRANSPORT_ATTR(_name, _mode)                      \
static struct target_stat_scsi_transport_attribute                      \
                        target_stat_scsi_transport_##_name =            \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_transport_show_attr_##_name,                   \
        target_stat_scsi_transport_store_attr_##_name);

#define DEV_STAT_SCSI_TRANSPORT_ATTR_RO(_name)                          \
static struct target_stat_scsi_transport_attribute                      \
                        target_stat_scsi_transport_##_name =            \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_transport_show_attr_##_name);

static ssize_t target_stat_scsi_transport_show_attr_inst(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n", dev->hba_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TRANSPORT_ATTR_RO(inst);

static ssize_t target_stat_scsi_transport_show_attr_device(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        struct se_portal_group *tpg = lun->lun_tpg;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev) {
                /* scsiTransportType */
                ret = snprintf(page, PAGE_SIZE, "scsiTransport%s\n",
                               tpg->se_tpg_tfo->get_fabric_name());
        }
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TRANSPORT_ATTR_RO(device);

static ssize_t target_stat_scsi_transport_show_attr_indx(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        struct se_portal_group *tpg = lun->lun_tpg;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev)
                ret = snprintf(page, PAGE_SIZE, "%u\n",
                               tpg->se_tpg_tfo->tpg_get_inst_index(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TRANSPORT_ATTR_RO(indx);

static ssize_t target_stat_scsi_transport_show_attr_dev_name(
        struct se_port_stat_grps *pgrps, char *page)
{
        struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
        struct se_device *dev;
        struct se_portal_group *tpg = lun->lun_tpg;
        struct t10_wwn *wwn;
        ssize_t ret = -ENODEV;

        rcu_read_lock();
        dev = rcu_dereference(lun->lun_se_dev);
        if (dev) {
                wwn = &dev->t10_wwn;
                /* scsiTransportDevName */
                ret = snprintf(page, PAGE_SIZE, "%s+%s\n",
                                tpg->se_tpg_tfo->tpg_get_wwn(tpg),
                                (strlen(wwn->unit_serial)) ? wwn->unit_serial :
                                wwn->vendor);
        }
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_TRANSPORT_ATTR_RO(dev_name);

CONFIGFS_EATTR_OPS(target_stat_scsi_transport, se_port_stat_grps,
                scsi_transport_group);

static struct configfs_attribute *target_stat_scsi_transport_attrs[] = {
        &target_stat_scsi_transport_inst.attr,
        &target_stat_scsi_transport_device.attr,
        &target_stat_scsi_transport_indx.attr,
        &target_stat_scsi_transport_dev_name.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_transport_attrib_ops = {
        .show_attribute         = target_stat_scsi_transport_attr_show,
        .store_attribute        = target_stat_scsi_transport_attr_store,
};

static struct config_item_type target_stat_scsi_transport_cit = {
        .ct_item_ops            = &target_stat_scsi_transport_attrib_ops,
        .ct_attrs               = target_stat_scsi_transport_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * Called from target_core_fabric_configfs.c:target_fabric_make_lun() to setup
 * the target port statistics groups + configfs CITs located in target_core_stat.c
 */
void target_stat_setup_port_default_groups(struct se_lun *lun)
{
        struct config_group *port_stat_grp = &lun->port_stat_grps.stat_group;

        config_group_init_type_name(&lun->port_stat_grps.scsi_port_group,
                        "scsi_port", &target_stat_scsi_port_cit);
        config_group_init_type_name(&lun->port_stat_grps.scsi_tgt_port_group,
                        "scsi_tgt_port", &target_stat_scsi_tgt_port_cit);
        config_group_init_type_name(&lun->port_stat_grps.scsi_transport_group,
                        "scsi_transport", &target_stat_scsi_transport_cit);

        port_stat_grp->default_groups[0] = &lun->port_stat_grps.scsi_port_group;
        port_stat_grp->default_groups[1] = &lun->port_stat_grps.scsi_tgt_port_group;
        port_stat_grp->default_groups[2] = &lun->port_stat_grps.scsi_transport_group;
        port_stat_grp->default_groups[3] = NULL;
}

/*
 * SCSI Authorized Initiator Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_auth_intr, se_ml_stat_grps);
#define DEV_STAT_SCSI_AUTH_INTR_ATTR(_name, _mode)                      \
static struct target_stat_scsi_auth_intr_attribute                      \
                        target_stat_scsi_auth_intr_##_name =            \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_auth_intr_show_attr_##_name,                   \
        target_stat_scsi_auth_intr_store_attr_##_name);

#define DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(_name)                          \
static struct target_stat_scsi_auth_intr_attribute                      \
                        target_stat_scsi_auth_intr_##_name =            \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_auth_intr_show_attr_##_name);

static ssize_t target_stat_scsi_auth_intr_show_attr_inst(
        struct se_ml_stat_grps *lgrps, char *page)
{

        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_portal_group *tpg;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        tpg = nacl->se_tpg;
        /* scsiInstIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n",
                        tpg->se_tpg_tfo->tpg_get_inst_index(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(inst);

static ssize_t target_stat_scsi_auth_intr_show_attr_dev(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_lun *lun;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        lun = rcu_dereference(deve->se_lun);
        /* scsiDeviceIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(dev);

static ssize_t target_stat_scsi_auth_intr_show_attr_port(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_portal_group *tpg;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        tpg = nacl->se_tpg;
        /* scsiAuthIntrTgtPortIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", tpg->se_tpg_tfo->tpg_get_tag(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(port);

static ssize_t target_stat_scsi_auth_intr_show_attr_indx(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", nacl->acl_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(indx);

static ssize_t target_stat_scsi_auth_intr_show_attr_dev_or_port(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrDevOrPort */
        ret = snprintf(page, PAGE_SIZE, "%u\n", 1);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(dev_or_port);

static ssize_t target_stat_scsi_auth_intr_show_attr_intr_name(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrName */
        ret = snprintf(page, PAGE_SIZE, "%s\n", nacl->initiatorname);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(intr_name);

static ssize_t target_stat_scsi_auth_intr_show_attr_map_indx(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* FIXME: scsiAuthIntrLunMapIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", 0);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(map_indx);

static ssize_t target_stat_scsi_auth_intr_show_attr_att_count(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrAttachedTimes */
        ret = snprintf(page, PAGE_SIZE, "%u\n", deve->attach_count);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(att_count);

static ssize_t target_stat_scsi_auth_intr_show_attr_num_cmds(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrOutCommands */
        ret = snprintf(page, PAGE_SIZE, "%lu\n",
                       atomic_long_read(&deve->total_cmds));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(num_cmds);

static ssize_t target_stat_scsi_auth_intr_show_attr_read_mbytes(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrReadMegaBytes */
        ret = snprintf(page, PAGE_SIZE, "%u\n",
                      (u32)(atomic_long_read(&deve->read_bytes) >> 20));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(read_mbytes);

static ssize_t target_stat_scsi_auth_intr_show_attr_write_mbytes(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrWrittenMegaBytes */
        ret = snprintf(page, PAGE_SIZE, "%u\n",
                      (u32)(atomic_long_read(&deve->write_bytes) >> 20));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(write_mbytes);

static ssize_t target_stat_scsi_auth_intr_show_attr_hs_num_cmds(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* FIXME: scsiAuthIntrHSOutCommands */
        ret = snprintf(page, PAGE_SIZE, "%u\n", 0);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(hs_num_cmds);

static ssize_t target_stat_scsi_auth_intr_show_attr_creation_time(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAuthIntrLastCreation */
        ret = snprintf(page, PAGE_SIZE, "%u\n", (u32)(((u32)deve->creation_time -
                                INITIAL_JIFFIES) * 100 / HZ));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(creation_time);

static ssize_t target_stat_scsi_auth_intr_show_attr_row_status(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* FIXME: scsiAuthIntrRowStatus */
        ret = snprintf(page, PAGE_SIZE, "Ready\n");
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_AUTH_INTR_ATTR_RO(row_status);

CONFIGFS_EATTR_OPS(target_stat_scsi_auth_intr, se_ml_stat_grps,
                scsi_auth_intr_group);

static struct configfs_attribute *target_stat_scsi_auth_intr_attrs[] = {
        &target_stat_scsi_auth_intr_inst.attr,
        &target_stat_scsi_auth_intr_dev.attr,
        &target_stat_scsi_auth_intr_port.attr,
        &target_stat_scsi_auth_intr_indx.attr,
        &target_stat_scsi_auth_intr_dev_or_port.attr,
        &target_stat_scsi_auth_intr_intr_name.attr,
        &target_stat_scsi_auth_intr_map_indx.attr,
        &target_stat_scsi_auth_intr_att_count.attr,
        &target_stat_scsi_auth_intr_num_cmds.attr,
        &target_stat_scsi_auth_intr_read_mbytes.attr,
        &target_stat_scsi_auth_intr_write_mbytes.attr,
        &target_stat_scsi_auth_intr_hs_num_cmds.attr,
        &target_stat_scsi_auth_intr_creation_time.attr,
        &target_stat_scsi_auth_intr_row_status.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_auth_intr_attrib_ops = {
        .show_attribute         = target_stat_scsi_auth_intr_attr_show,
        .store_attribute        = target_stat_scsi_auth_intr_attr_store,
};

static struct config_item_type target_stat_scsi_auth_intr_cit = {
        .ct_item_ops            = &target_stat_scsi_auth_intr_attrib_ops,
        .ct_attrs               = target_stat_scsi_auth_intr_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Attached Initiator Port Table
 */

CONFIGFS_EATTR_STRUCT(target_stat_scsi_att_intr_port, se_ml_stat_grps);
#define DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR(_name, _mode)                 \
static struct target_stat_scsi_att_intr_port_attribute                  \
                target_stat_scsi_att_intr_port_##_name =                \
        __CONFIGFS_EATTR(_name, _mode,                                  \
        target_stat_scsi_att_intr_port_show_attr_##_name,               \
        target_stat_scsi_att_intr_port_store_attr_##_name);

#define DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(_name)                     \
static struct target_stat_scsi_att_intr_port_attribute                  \
                target_stat_scsi_att_intr_port_##_name =                \
        __CONFIGFS_EATTR_RO(_name,                                      \
        target_stat_scsi_att_intr_port_show_attr_##_name);

static ssize_t target_stat_scsi_att_intr_port_show_attr_inst(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_portal_group *tpg;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        tpg = nacl->se_tpg;
        /* scsiInstIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n",
                        tpg->se_tpg_tfo->tpg_get_inst_index(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(inst);

static ssize_t target_stat_scsi_att_intr_port_show_attr_dev(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_lun *lun;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        lun = rcu_dereference(deve->se_lun);
        /* scsiDeviceIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(dev);

static ssize_t target_stat_scsi_att_intr_port_show_attr_port(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        struct se_portal_group *tpg;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        tpg = nacl->se_tpg;
        /* scsiPortIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", tpg->se_tpg_tfo->tpg_get_tag(tpg));
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(port);

static ssize_t target_stat_scsi_att_intr_port_show_attr_indx(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_session *se_sess;
        struct se_portal_group *tpg;
        ssize_t ret;

        spin_lock_irq(&nacl->nacl_sess_lock);
        se_sess = nacl->nacl_sess;
        if (!se_sess) {
                spin_unlock_irq(&nacl->nacl_sess_lock);
                return -ENODEV;
        }

        tpg = nacl->se_tpg;
        /* scsiAttIntrPortIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n",
                        tpg->se_tpg_tfo->sess_get_index(se_sess));
        spin_unlock_irq(&nacl->nacl_sess_lock);
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(indx);

static ssize_t target_stat_scsi_att_intr_port_show_attr_port_auth_indx(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_dev_entry *deve;
        ssize_t ret;

        rcu_read_lock();
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);
        if (!deve) {
                rcu_read_unlock();
                return -ENODEV;
        }
        /* scsiAttIntrPortAuthIntrIdx */
        ret = snprintf(page, PAGE_SIZE, "%u\n", nacl->acl_index);
        rcu_read_unlock();
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(port_auth_indx);

static ssize_t target_stat_scsi_att_intr_port_show_attr_port_ident(
        struct se_ml_stat_grps *lgrps, char *page)
{
        struct se_lun_acl *lacl = container_of(lgrps,
                        struct se_lun_acl, ml_stat_grps);
        struct se_node_acl *nacl = lacl->se_lun_nacl;
        struct se_session *se_sess;
        struct se_portal_group *tpg;
        ssize_t ret;
        unsigned char buf[64];

        spin_lock_irq(&nacl->nacl_sess_lock);
        se_sess = nacl->nacl_sess;
        if (!se_sess) {
                spin_unlock_irq(&nacl->nacl_sess_lock);
                return -ENODEV;
        }

        tpg = nacl->se_tpg;
        /* scsiAttIntrPortName+scsiAttIntrPortIdentifier */
        memset(buf, 0, 64);
        if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL)
                tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, buf, 64);

        ret = snprintf(page, PAGE_SIZE, "%s+i+%s\n", nacl->initiatorname, buf);
        spin_unlock_irq(&nacl->nacl_sess_lock);
        return ret;
}
DEV_STAT_SCSI_ATTR_INTR_PORT_ATTR_RO(port_ident);

CONFIGFS_EATTR_OPS(target_stat_scsi_att_intr_port, se_ml_stat_grps,
                scsi_att_intr_port_group);

static struct configfs_attribute *target_stat_scsi_ath_intr_port_attrs[] = {
        &target_stat_scsi_att_intr_port_inst.attr,
        &target_stat_scsi_att_intr_port_dev.attr,
        &target_stat_scsi_att_intr_port_port.attr,
        &target_stat_scsi_att_intr_port_indx.attr,
        &target_stat_scsi_att_intr_port_port_auth_indx.attr,
        &target_stat_scsi_att_intr_port_port_ident.attr,
        NULL,
};

static struct configfs_item_operations target_stat_scsi_att_intr_port_attrib_ops = {
        .show_attribute         = target_stat_scsi_att_intr_port_attr_show,
        .store_attribute        = target_stat_scsi_att_intr_port_attr_store,
};

static struct config_item_type target_stat_scsi_att_intr_port_cit = {
        .ct_item_ops            = &target_stat_scsi_att_intr_port_attrib_ops,
        .ct_attrs               = target_stat_scsi_ath_intr_port_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * Called from target_core_fabric_configfs.c:target_fabric_make_mappedlun() to setup
 * the target MappedLUN statistics groups + configfs CITs located in target_core_stat.c
 */
void target_stat_setup_mappedlun_default_groups(struct se_lun_acl *lacl)
{
        struct config_group *ml_stat_grp = &lacl->ml_stat_grps.stat_group;

        config_group_init_type_name(&lacl->ml_stat_grps.scsi_auth_intr_group,
                        "scsi_auth_intr", &target_stat_scsi_auth_intr_cit);
        config_group_init_type_name(&lacl->ml_stat_grps.scsi_att_intr_port_group,
                        "scsi_att_intr_port", &target_stat_scsi_att_intr_port_cit);

        ml_stat_grp->default_groups[0] = &lacl->ml_stat_grps.scsi_auth_intr_group;
        ml_stat_grp->default_groups[1] = &lacl->ml_stat_grps.scsi_att_intr_port_group;
        ml_stat_grp->default_groups[2] = NULL;
}