// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
 * 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>
 *
 ******************************************************************************/

#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_core_internal.h"

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

#define SCSI_LU_INDEX                   1
#define LU_COUNT                        1

/*
 * SCSI Device Table
 */

static struct se_device *to_stat_dev(struct config_item *item)
{
        struct se_dev_stat_grps *sgrps = container_of(to_config_group(item),
                        struct se_dev_stat_grps, scsi_dev_group);
        return container_of(sgrps, struct se_device, dev_stat_grps);
}

static ssize_t target_stat_inst_show(struct config_item *item, char *page)
{
        struct se_hba *hba = to_stat_dev(item)->se_hba;

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

static ssize_t target_stat_indx_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", to_stat_dev(item)->dev_index);
}

static ssize_t target_stat_role_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "Target\n");
}

static ssize_t target_stat_ports_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", to_stat_dev(item)->export_count);
}

CONFIGFS_ATTR_RO(target_stat_, inst);
CONFIGFS_ATTR_RO(target_stat_, indx);
CONFIGFS_ATTR_RO(target_stat_, role);
CONFIGFS_ATTR_RO(target_stat_, ports);

static struct configfs_attribute *target_stat_scsi_dev_attrs[] = {
        &target_stat_attr_inst,
        &target_stat_attr_indx,
        &target_stat_attr_role,
        &target_stat_attr_ports,
        NULL,
};

static const struct config_item_type target_stat_scsi_dev_cit = {
        .ct_attrs               = target_stat_scsi_dev_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Target Device Table
 */
static struct se_device *to_stat_tgt_dev(struct config_item *item)
{
        struct se_dev_stat_grps *sgrps = container_of(to_config_group(item),
                        struct se_dev_stat_grps, scsi_tgt_dev_group);
        return container_of(sgrps, struct se_device, dev_stat_grps);
}

static ssize_t target_stat_tgt_inst_show(struct config_item *item, char *page)
{
        struct se_hba *hba = to_stat_tgt_dev(item)->se_hba;

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

static ssize_t target_stat_tgt_indx_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", to_stat_tgt_dev(item)->dev_index);
}

static ssize_t target_stat_tgt_num_lus_show(struct config_item *item,
                char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", LU_COUNT);
}

static ssize_t target_stat_tgt_status_show(struct config_item *item,
                char *page)
{
        if (to_stat_tgt_dev(item)->export_count)
                return snprintf(page, PAGE_SIZE, "activated\n");
        else
                return snprintf(page, PAGE_SIZE, "deactivated\n");
}

static ssize_t target_stat_tgt_non_access_lus_show(struct config_item *item,
                char *page)
{
        int non_accessible_lus;

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

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

static ssize_t target_stat_tgt_resets_show(struct config_item *item,
                char *page)
{
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&to_stat_tgt_dev(item)->num_resets));
}

static ssize_t target_stat_tgt_aborts_complete_show(struct config_item *item,
                char *page)
{
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&to_stat_tgt_dev(item)->aborts_complete));
}

static ssize_t target_stat_tgt_aborts_no_task_show(struct config_item *item,
                char *page)
{
        return snprintf(page, PAGE_SIZE, "%lu\n",
                        atomic_long_read(&to_stat_tgt_dev(item)->aborts_no_task));
}

CONFIGFS_ATTR_RO(target_stat_tgt_, inst);
CONFIGFS_ATTR_RO(target_stat_tgt_, indx);
CONFIGFS_ATTR_RO(target_stat_tgt_, num_lus);
CONFIGFS_ATTR_RO(target_stat_tgt_, status);
CONFIGFS_ATTR_RO(target_stat_tgt_, non_access_lus);
CONFIGFS_ATTR_RO(target_stat_tgt_, resets);
CONFIGFS_ATTR_RO(target_stat_tgt_, aborts_complete);
CONFIGFS_ATTR_RO(target_stat_tgt_, aborts_no_task);

static struct configfs_attribute *target_stat_scsi_tgt_dev_attrs[] = {
        &target_stat_tgt_attr_inst,
        &target_stat_tgt_attr_indx,
        &target_stat_tgt_attr_num_lus,
        &target_stat_tgt_attr_status,
        &target_stat_tgt_attr_non_access_lus,
        &target_stat_tgt_attr_resets,
        &target_stat_tgt_attr_aborts_complete,
        &target_stat_tgt_attr_aborts_no_task,
        NULL,
};

static const struct config_item_type target_stat_scsi_tgt_dev_cit = {
        .ct_attrs               = target_stat_scsi_tgt_dev_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Logical Unit Table
 */

static struct se_device *to_stat_lu_dev(struct config_item *item)
{
        struct se_dev_stat_grps *sgrps = container_of(to_config_group(item),
                        struct se_dev_stat_grps, scsi_lu_group);
        return container_of(sgrps, struct se_device, dev_stat_grps);
}

static ssize_t target_stat_lu_inst_show(struct config_item *item, char *page)
{
        struct se_hba *hba = to_stat_lu_dev(item)->se_hba;

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

static ssize_t target_stat_lu_dev_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n",
                        to_stat_lu_dev(item)->dev_index);
}

static ssize_t target_stat_lu_indx_show(struct config_item *item, char *page)
{
        return snprintf(page, PAGE_SIZE, "%u\n", SCSI_LU_INDEX);
}

static ssize_t target_stat_lu_lun_show(struct config_item *item, char *page)
{
        /* FIXME: scsiLuDefaultLun */
        return snprintf(page, PAGE_SIZE, "%llu\n", (unsigned long long)0);
}

static ssize_t target_stat_lu_lu_name_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

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

static ssize_t target_stat_lu_vend_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

        return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_VENDOR_LEN)
                        "s\n", dev->t10_wwn.vendor);
}

static ssize_t target_stat_lu_prod_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

        return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_MODEL_LEN)
                        "s\n", dev->t10_wwn.model);
}

static ssize_t target_stat_lu_rev_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

        return snprintf(page, PAGE_SIZE, "%-" __stringify(INQUIRY_REVISION_LEN)
                        "s\n", dev->t10_wwn.revision);
}

static ssize_t target_stat_lu_dev_type_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

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

static ssize_t target_stat_lu_status_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

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

static ssize_t target_stat_lu_state_bit_show(struct config_item *item,
                char *page)
{
        /* scsiLuState */
        return snprintf(page, PAGE_SIZE, "exposed\n");
}

#define per_cpu_stat_snprintf(stats_struct, prefix, field, shift)       \
static ssize_t                                                          \
per_cpu_stat_##prefix##_snprintf(struct stats_struct __percpu *per_cpu_stats, \
                                 char *page)                            \
{                                                                       \
        struct stats_struct *stats;                                     \
        unsigned int cpu;                                               \
        u64 sum = 0;                                                    \
                                                                        \
        for_each_possible_cpu(cpu) {                                    \
                stats = per_cpu_ptr(per_cpu_stats, cpu);                \
                sum += stats->field;                                    \
        }                                                               \
                                                                        \
        return snprintf(page, PAGE_SIZE, "%llu\n", sum >> shift);       \
}

#define lu_show_per_cpu_stat(prefix, field, shift)                      \
per_cpu_stat_snprintf(se_dev_io_stats, prefix, field, shift);           \
static ssize_t                                                          \
target_stat_##prefix##_show(struct config_item *item, char *page)       \
{                                                                       \
        struct se_device *dev = to_stat_lu_dev(item);                   \
                                                                        \
        return per_cpu_stat_##prefix##_snprintf(dev->stats, page);      \
}                                                                       \

/* scsiLuNumCommands */
lu_show_per_cpu_stat(lu_num_cmds, total_cmds, 0);
/* scsiLuReadMegaBytes */
lu_show_per_cpu_stat(lu_read_mbytes, read_bytes, 20);
/* scsiLuWrittenMegaBytes */
lu_show_per_cpu_stat(lu_write_mbytes, write_bytes, 20);

static ssize_t target_stat_lu_resets_show(struct config_item *item, char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

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

static ssize_t target_stat_lu_full_stat_show(struct config_item *item,
                char *page)
{
        /* FIXME: scsiLuOutTaskSetFullStatus */
        return snprintf(page, PAGE_SIZE, "%u\n", 0);
}

static ssize_t target_stat_lu_hs_num_cmds_show(struct config_item *item,
                char *page)
{
        /* FIXME: scsiLuHSInCommands */
        return snprintf(page, PAGE_SIZE, "%u\n", 0);
}

static ssize_t target_stat_lu_creation_time_show(struct config_item *item,
                char *page)
{
        struct se_device *dev = to_stat_lu_dev(item);

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

CONFIGFS_ATTR_RO(target_stat_lu_, inst);
CONFIGFS_ATTR_RO(target_stat_lu_, dev);
CONFIGFS_ATTR_RO(target_stat_lu_, indx);
CONFIGFS_ATTR_RO(target_stat_lu_, lun);
CONFIGFS_ATTR_RO(target_stat_lu_, lu_name);
CONFIGFS_ATTR_RO(target_stat_lu_, vend);
CONFIGFS_ATTR_RO(target_stat_lu_, prod);
CONFIGFS_ATTR_RO(target_stat_lu_, rev);
CONFIGFS_ATTR_RO(target_stat_lu_, dev_type);
CONFIGFS_ATTR_RO(target_stat_lu_, status);
CONFIGFS_ATTR_RO(target_stat_lu_, state_bit);
CONFIGFS_ATTR_RO(target_stat_lu_, num_cmds);
CONFIGFS_ATTR_RO(target_stat_lu_, read_mbytes);
CONFIGFS_ATTR_RO(target_stat_lu_, write_mbytes);
CONFIGFS_ATTR_RO(target_stat_lu_, resets);
CONFIGFS_ATTR_RO(target_stat_lu_, full_stat);
CONFIGFS_ATTR_RO(target_stat_lu_, hs_num_cmds);
CONFIGFS_ATTR_RO(target_stat_lu_, creation_time);

static struct configfs_attribute *target_stat_scsi_lu_attrs[] = {
        &target_stat_lu_attr_inst,
        &target_stat_lu_attr_dev,
        &target_stat_lu_attr_indx,
        &target_stat_lu_attr_lun,
        &target_stat_lu_attr_lu_name,
        &target_stat_lu_attr_vend,
        &target_stat_lu_attr_prod,
        &target_stat_lu_attr_rev,
        &target_stat_lu_attr_dev_type,
        &target_stat_lu_attr_status,
        &target_stat_lu_attr_state_bit,
        &target_stat_lu_attr_num_cmds,
        &target_stat_lu_attr_read_mbytes,
        &target_stat_lu_attr_write_mbytes,
        &target_stat_lu_attr_resets,
        &target_stat_lu_attr_full_stat,
        &target_stat_lu_attr_hs_num_cmds,
        &target_stat_lu_attr_creation_time,
        NULL,
};

static const struct config_item_type target_stat_scsi_lu_cit = {
        .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)
{
        config_group_init_type_name(&dev->dev_stat_grps.scsi_dev_group,
                        "scsi_dev", &target_stat_scsi_dev_cit);
        configfs_add_default_group(&dev->dev_stat_grps.scsi_dev_group,
                        &dev->dev_stat_grps.stat_group);

        config_group_init_type_name(&dev->dev_stat_grps.scsi_tgt_dev_group,
                        "scsi_tgt_dev", &target_stat_scsi_tgt_dev_cit);
        configfs_add_default_group(&dev->dev_stat_grps.scsi_tgt_dev_group,
                        &dev->dev_stat_grps.stat_group);

        config_group_init_type_name(&dev->dev_stat_grps.scsi_lu_group,
                        "scsi_lu", &target_stat_scsi_lu_cit);
        configfs_add_default_group(&dev->dev_stat_grps.scsi_lu_group,
                        &dev->dev_stat_grps.stat_group);
}

/*
 * SCSI Port Table
 */

static struct se_lun *to_stat_port(struct config_item *item)
{
        struct se_port_stat_grps *pgrps = container_of(to_config_group(item),
                        struct se_port_stat_grps, scsi_port_group);
        return container_of(pgrps, struct se_lun, port_stat_grps);
}

static ssize_t target_stat_port_inst_show(struct config_item *item, char *page)
{
        struct se_lun *lun = to_stat_port(item);
        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;
}

static ssize_t target_stat_port_dev_show(struct config_item *item, char *page)
{
        struct se_lun *lun = to_stat_port(item);
        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;
}

static ssize_t target_stat_port_indx_show(struct config_item *item, char *page)
{
        struct se_lun *lun = to_stat_port(item);
        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_tpg->tpg_rtpi);
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_port_role_show(struct config_item *item, char *page)
{
        struct se_lun *lun = to_stat_port(item);
        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;
}

static ssize_t target_stat_port_busy_count_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_port(item);
        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;
}

CONFIGFS_ATTR_RO(target_stat_port_, inst);
CONFIGFS_ATTR_RO(target_stat_port_, dev);
CONFIGFS_ATTR_RO(target_stat_port_, indx);
CONFIGFS_ATTR_RO(target_stat_port_, role);
CONFIGFS_ATTR_RO(target_stat_port_, busy_count);

static struct configfs_attribute *target_stat_scsi_port_attrs[] = {
        &target_stat_port_attr_inst,
        &target_stat_port_attr_dev,
        &target_stat_port_attr_indx,
        &target_stat_port_attr_role,
        &target_stat_port_attr_busy_count,
        NULL,
};

static const struct config_item_type target_stat_scsi_port_cit = {
        .ct_attrs               = target_stat_scsi_port_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Target Port Table
 */
static struct se_lun *to_stat_tgt_port(struct config_item *item)
{
        struct se_port_stat_grps *pgrps = container_of(to_config_group(item),
                        struct se_port_stat_grps, scsi_tgt_port_group);
        return container_of(pgrps, struct se_lun, port_stat_grps);
}

static ssize_t target_stat_tgt_port_inst_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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;
}

static ssize_t target_stat_tgt_port_dev_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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;
}

static ssize_t target_stat_tgt_port_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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_tpg->tpg_rtpi);
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_tgt_port_name_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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->fabric_name,
                        lun->lun_tpg->tpg_rtpi);
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_tgt_port_port_index_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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;
}

#define tgt_port_show_per_cpu_stat(prefix, field, shift)                \
per_cpu_stat_snprintf(scsi_port_stats, prefix, field, shift);           \
static ssize_t                                                          \
target_stat_##prefix##_show(struct config_item *item, char *page)       \
{                                                                       \
        struct se_lun *lun = to_stat_tgt_port(item);                    \
        struct se_device *dev;                                          \
        int ret;                                                        \
                                                                        \
        rcu_read_lock();                                                \
        dev = rcu_dereference(lun->lun_se_dev);                         \
        if (!dev) {                                                     \
                rcu_read_unlock();                                      \
                return -ENODEV;                                         \
        }                                                               \
                                                                        \
        ret = per_cpu_stat_##prefix##_snprintf(lun->lun_stats, page);   \
        rcu_read_unlock();                                              \
        return ret;                                                     \
}

tgt_port_show_per_cpu_stat(tgt_port_in_cmds, cmd_pdus, 0);
tgt_port_show_per_cpu_stat(tgt_port_write_mbytes, rx_data_octets, 20);
tgt_port_show_per_cpu_stat(tgt_port_read_mbytes, tx_data_octets, 20);

static ssize_t target_stat_tgt_port_hs_in_cmds_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_stat_tgt_port(item);
        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;
}

CONFIGFS_ATTR_RO(target_stat_tgt_port_, inst);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, dev);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, indx);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, name);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, port_index);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, in_cmds);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, write_mbytes);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, read_mbytes);
CONFIGFS_ATTR_RO(target_stat_tgt_port_, hs_in_cmds);

static struct configfs_attribute *target_stat_scsi_tgt_port_attrs[] = {
        &target_stat_tgt_port_attr_inst,
        &target_stat_tgt_port_attr_dev,
        &target_stat_tgt_port_attr_indx,
        &target_stat_tgt_port_attr_name,
        &target_stat_tgt_port_attr_port_index,
        &target_stat_tgt_port_attr_in_cmds,
        &target_stat_tgt_port_attr_write_mbytes,
        &target_stat_tgt_port_attr_read_mbytes,
        &target_stat_tgt_port_attr_hs_in_cmds,
        NULL,
};

static const struct config_item_type target_stat_scsi_tgt_port_cit = {
        .ct_attrs               = target_stat_scsi_tgt_port_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Transport Table
 */
static struct se_lun *to_transport_stat(struct config_item *item)
{
        struct se_port_stat_grps *pgrps = container_of(to_config_group(item),
                        struct se_port_stat_grps, scsi_transport_group);
        return container_of(pgrps, struct se_lun, port_stat_grps);
}

static ssize_t target_stat_transport_inst_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_transport_stat(item);
        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;
}

static ssize_t target_stat_transport_device_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_transport_stat(item);
        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->fabric_name);
        }
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_transport_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_transport_stat(item);
        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;
}

static ssize_t target_stat_transport_dev_name_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_transport_stat(item);
        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;
}

static ssize_t target_stat_transport_proto_id_show(struct config_item *item,
                char *page)
{
        struct se_lun *lun = to_transport_stat(item);
        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->proto_id);
        rcu_read_unlock();
        return ret;
}

CONFIGFS_ATTR_RO(target_stat_transport_, inst);
CONFIGFS_ATTR_RO(target_stat_transport_, device);
CONFIGFS_ATTR_RO(target_stat_transport_, indx);
CONFIGFS_ATTR_RO(target_stat_transport_, dev_name);
CONFIGFS_ATTR_RO(target_stat_transport_, proto_id);

static struct configfs_attribute *target_stat_scsi_transport_attrs[] = {
        &target_stat_transport_attr_inst,
        &target_stat_transport_attr_device,
        &target_stat_transport_attr_indx,
        &target_stat_transport_attr_dev_name,
        &target_stat_transport_attr_proto_id,
        NULL,
};

static const struct config_item_type target_stat_scsi_transport_cit = {
        .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)
{
        config_group_init_type_name(&lun->port_stat_grps.scsi_port_group,
                        "scsi_port", &target_stat_scsi_port_cit);
        configfs_add_default_group(&lun->port_stat_grps.scsi_port_group,
                        &lun->port_stat_grps.stat_group);

        config_group_init_type_name(&lun->port_stat_grps.scsi_tgt_port_group,
                        "scsi_tgt_port", &target_stat_scsi_tgt_port_cit);
        configfs_add_default_group(&lun->port_stat_grps.scsi_tgt_port_group,
                        &lun->port_stat_grps.stat_group);

        config_group_init_type_name(&lun->port_stat_grps.scsi_transport_group,
                        "scsi_transport", &target_stat_scsi_transport_cit);
        configfs_add_default_group(&lun->port_stat_grps.scsi_transport_group,
                        &lun->port_stat_grps.stat_group);
}

/*
 * SCSI Authorized Initiator Table
 */

static struct se_lun_acl *auth_to_lacl(struct config_item *item)
{
        struct se_ml_stat_grps *lgrps = container_of(to_config_group(item),
                        struct se_ml_stat_grps, scsi_auth_intr_group);
        return container_of(lgrps, struct se_lun_acl, ml_stat_grps);
}

static ssize_t target_stat_auth_inst_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_dev_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
        }

        /* scsiDeviceIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", deve->se_lun->lun_index);
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_auth_port_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_dev_or_port_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_intr_name_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_map_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_att_count_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

#define auth_show_per_cpu_stat(prefix, field, shift)                    \
per_cpu_stat_snprintf(se_dev_entry_io_stats, prefix, field, shift);     \
static ssize_t                                                          \
target_stat_##prefix##_show(struct config_item *item, char *page)       \
{                                                                       \
        struct se_lun_acl *lacl = auth_to_lacl(item);                   \
        struct se_node_acl *nacl = lacl->se_lun_nacl;                   \
        struct se_dev_entry *deve;                                      \
        int ret;                                                        \
                                                                        \
        rcu_read_lock();                                                \
        deve = target_nacl_find_deve(nacl, lacl->mapped_lun);           \
        if (!deve) {                                                    \
                rcu_read_unlock();                                      \
                return -ENODEV;                                         \
        }                                                               \
                                                                        \
        ret = per_cpu_stat_##prefix##_snprintf(deve->stats, page);      \
        rcu_read_unlock();                                              \
        return ret;                                                     \
}

/* scsiAuthIntrOutCommands */
auth_show_per_cpu_stat(auth_num_cmds, total_cmds, 0);
/* scsiAuthIntrReadMegaBytes */
auth_show_per_cpu_stat(auth_read_mbytes, read_bytes, 20);
/* scsiAuthIntrWrittenMegaBytes */
auth_show_per_cpu_stat(auth_write_mbytes, write_bytes, 20);

static ssize_t target_stat_auth_hs_num_cmds_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_creation_time_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

static ssize_t target_stat_auth_row_status_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = auth_to_lacl(item);
        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;
}

CONFIGFS_ATTR_RO(target_stat_auth_, inst);
CONFIGFS_ATTR_RO(target_stat_auth_, dev);
CONFIGFS_ATTR_RO(target_stat_auth_, port);
CONFIGFS_ATTR_RO(target_stat_auth_, indx);
CONFIGFS_ATTR_RO(target_stat_auth_, dev_or_port);
CONFIGFS_ATTR_RO(target_stat_auth_, intr_name);
CONFIGFS_ATTR_RO(target_stat_auth_, map_indx);
CONFIGFS_ATTR_RO(target_stat_auth_, att_count);
CONFIGFS_ATTR_RO(target_stat_auth_, num_cmds);
CONFIGFS_ATTR_RO(target_stat_auth_, read_mbytes);
CONFIGFS_ATTR_RO(target_stat_auth_, write_mbytes);
CONFIGFS_ATTR_RO(target_stat_auth_, hs_num_cmds);
CONFIGFS_ATTR_RO(target_stat_auth_, creation_time);
CONFIGFS_ATTR_RO(target_stat_auth_, row_status);

static struct configfs_attribute *target_stat_scsi_auth_intr_attrs[] = {
        &target_stat_auth_attr_inst,
        &target_stat_auth_attr_dev,
        &target_stat_auth_attr_port,
        &target_stat_auth_attr_indx,
        &target_stat_auth_attr_dev_or_port,
        &target_stat_auth_attr_intr_name,
        &target_stat_auth_attr_map_indx,
        &target_stat_auth_attr_att_count,
        &target_stat_auth_attr_num_cmds,
        &target_stat_auth_attr_read_mbytes,
        &target_stat_auth_attr_write_mbytes,
        &target_stat_auth_attr_hs_num_cmds,
        &target_stat_auth_attr_creation_time,
        &target_stat_auth_attr_row_status,
        NULL,
};

static const struct config_item_type target_stat_scsi_auth_intr_cit = {
        .ct_attrs               = target_stat_scsi_auth_intr_attrs,
        .ct_owner               = THIS_MODULE,
};

/*
 * SCSI Attached Initiator Port Table
 */

static struct se_lun_acl *iport_to_lacl(struct config_item *item)
{
        struct se_ml_stat_grps *lgrps = container_of(to_config_group(item),
                        struct se_ml_stat_grps, scsi_att_intr_port_group);
        return container_of(lgrps, struct se_lun_acl, ml_stat_grps);
}

static ssize_t target_stat_iport_inst_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
}

static ssize_t target_stat_iport_dev_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
        }

        /* scsiDeviceIndex */
        ret = snprintf(page, PAGE_SIZE, "%u\n", deve->se_lun->lun_index);
        rcu_read_unlock();
        return ret;
}

static ssize_t target_stat_iport_port_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
}

static ssize_t target_stat_iport_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
}

static ssize_t target_stat_iport_port_auth_indx_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
}

static ssize_t target_stat_iport_port_ident_show(struct config_item *item,
                char *page)
{
        struct se_lun_acl *lacl = iport_to_lacl(item);
        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;
}

CONFIGFS_ATTR_RO(target_stat_iport_, inst);
CONFIGFS_ATTR_RO(target_stat_iport_, dev);
CONFIGFS_ATTR_RO(target_stat_iport_, port);
CONFIGFS_ATTR_RO(target_stat_iport_, indx);
CONFIGFS_ATTR_RO(target_stat_iport_, port_auth_indx);
CONFIGFS_ATTR_RO(target_stat_iport_, port_ident);

static struct configfs_attribute *target_stat_scsi_ath_intr_port_attrs[] = {
        &target_stat_iport_attr_inst,
        &target_stat_iport_attr_dev,
        &target_stat_iport_attr_port,
        &target_stat_iport_attr_indx,
        &target_stat_iport_attr_port_auth_indx,
        &target_stat_iport_attr_port_ident,
        NULL,
};

static const struct config_item_type target_stat_scsi_att_intr_port_cit = {
        .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)
{
        config_group_init_type_name(&lacl->ml_stat_grps.scsi_auth_intr_group,
                        "scsi_auth_intr", &target_stat_scsi_auth_intr_cit);
        configfs_add_default_group(&lacl->ml_stat_grps.scsi_auth_intr_group,
                        &lacl->ml_stat_grps.stat_group);

        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);
        configfs_add_default_group(&lacl->ml_stat_grps.scsi_att_intr_port_group,
                        &lacl->ml_stat_grps.stat_group);
}