/*
 * net/core/ethtool.c - Ethtool ioctl handler
 * Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
 *
 * This file is where we call all the ethtool_ops commands to get
 * the information ethtool needs.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
#include <linux/net_tstamp.h>
#include <linux/phy.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/net.h>

/*
 * Some useful ethtool_ops methods that're device independent.
 * If we find that all drivers want to do the same thing here,
 * we can turn these into dev_() function calls.
 */

u32 ethtool_op_get_link(struct net_device *dev)
{
        return netif_carrier_ok(dev) ? 1 : 0;
}
EXPORT_SYMBOL(ethtool_op_get_link);

int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
{
        info->so_timestamping =
                SOF_TIMESTAMPING_TX_SOFTWARE |
                SOF_TIMESTAMPING_RX_SOFTWARE |
                SOF_TIMESTAMPING_SOFTWARE;
        info->phc_index = -1;
        return 0;
}
EXPORT_SYMBOL(ethtool_op_get_ts_info);

/* Handlers for each ethtool command */

#define ETHTOOL_DEV_FEATURE_WORDS       ((NETDEV_FEATURE_COUNT + 31) / 32)

static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
        [NETIF_F_SG_BIT] =               "tx-scatter-gather",
        [NETIF_F_IP_CSUM_BIT] =          "tx-checksum-ipv4",
        [NETIF_F_HW_CSUM_BIT] =          "tx-checksum-ip-generic",
        [NETIF_F_IPV6_CSUM_BIT] =        "tx-checksum-ipv6",
        [NETIF_F_HIGHDMA_BIT] =          "highdma",
        [NETIF_F_FRAGLIST_BIT] =         "tx-scatter-gather-fraglist",
        [NETIF_F_HW_VLAN_CTAG_TX_BIT] =  "tx-vlan-hw-insert",

        [NETIF_F_HW_VLAN_CTAG_RX_BIT] =  "rx-vlan-hw-parse",
        [NETIF_F_HW_VLAN_CTAG_FILTER_BIT] = "rx-vlan-filter",
        [NETIF_F_HW_VLAN_STAG_TX_BIT] =  "tx-vlan-stag-hw-insert",
        [NETIF_F_HW_VLAN_STAG_RX_BIT] =  "rx-vlan-stag-hw-parse",
        [NETIF_F_HW_VLAN_STAG_FILTER_BIT] = "rx-vlan-stag-filter",
        [NETIF_F_VLAN_CHALLENGED_BIT] =  "vlan-challenged",
        [NETIF_F_GSO_BIT] =              "tx-generic-segmentation",
        [NETIF_F_LLTX_BIT] =             "tx-lockless",
        [NETIF_F_NETNS_LOCAL_BIT] =      "netns-local",
        [NETIF_F_GRO_BIT] =              "rx-gro",
        [NETIF_F_LRO_BIT] =              "rx-lro",

        [NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
        [NETIF_F_UFO_BIT] =              "tx-udp-fragmentation",
        [NETIF_F_GSO_ROBUST_BIT] =       "tx-gso-robust",
        [NETIF_F_TSO_ECN_BIT] =          "tx-tcp-ecn-segmentation",
        [NETIF_F_TSO_MANGLEID_BIT] =     "tx-tcp-mangleid-segmentation",
        [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
        [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
        [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
        [NETIF_F_GSO_GRE_CSUM_BIT] =     "tx-gre-csum-segmentation",
        [NETIF_F_GSO_IPXIP4_BIT] =       "tx-ipxip4-segmentation",
        [NETIF_F_GSO_IPXIP6_BIT] =       "tx-ipxip6-segmentation",
        [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
        [NETIF_F_GSO_UDP_TUNNEL_CSUM_BIT] = "tx-udp_tnl-csum-segmentation",
        [NETIF_F_GSO_PARTIAL_BIT] =      "tx-gso-partial",
        [NETIF_F_GSO_SCTP_BIT] =         "tx-sctp-segmentation",

        [NETIF_F_FCOE_CRC_BIT] =         "tx-checksum-fcoe-crc",
        [NETIF_F_SCTP_CRC_BIT] =        "tx-checksum-sctp",
        [NETIF_F_FCOE_MTU_BIT] =         "fcoe-mtu",
        [NETIF_F_NTUPLE_BIT] =           "rx-ntuple-filter",
        [NETIF_F_RXHASH_BIT] =           "rx-hashing",
        [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
        [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
        [NETIF_F_LOOPBACK_BIT] =         "loopback",
        [NETIF_F_RXFCS_BIT] =            "rx-fcs",
        [NETIF_F_RXALL_BIT] =            "rx-all",
        [NETIF_F_HW_L2FW_DOFFLOAD_BIT] = "l2-fwd-offload",
        [NETIF_F_BUSY_POLL_BIT] =        "busy-poll",
        [NETIF_F_HW_TC_BIT] =            "hw-tc-offload",
};

static const char
rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
        [ETH_RSS_HASH_TOP_BIT] =        "toeplitz",
        [ETH_RSS_HASH_XOR_BIT] =        "xor",
};

static const char
tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
        [ETHTOOL_ID_UNSPEC]     = "Unspec",
        [ETHTOOL_RX_COPYBREAK]  = "rx-copybreak",
        [ETHTOOL_TX_COPYBREAK]  = "tx-copybreak",
};

static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_gfeatures cmd = {
                .cmd = ETHTOOL_GFEATURES,
                .size = ETHTOOL_DEV_FEATURE_WORDS,
        };
        struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
        u32 __user *sizeaddr;
        u32 copy_size;
        int i;

        /* in case feature bits run out again */
        BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));

        for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
                features[i].available = (u32)(dev->hw_features >> (32 * i));
                features[i].requested = (u32)(dev->wanted_features >> (32 * i));
                features[i].active = (u32)(dev->features >> (32 * i));
                features[i].never_changed =
                        (u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
        }

        sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
        if (get_user(copy_size, sizeaddr))
                return -EFAULT;

        if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
                copy_size = ETHTOOL_DEV_FEATURE_WORDS;

        if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
                return -EFAULT;
        useraddr += sizeof(cmd);
        if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
                return -EFAULT;

        return 0;
}

static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_sfeatures cmd;
        struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
        netdev_features_t wanted = 0, valid = 0;
        int i, ret = 0;

        if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
                return -EFAULT;
        useraddr += sizeof(cmd);

        if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
                return -EINVAL;

        if (copy_from_user(features, useraddr, sizeof(features)))
                return -EFAULT;

        for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
                valid |= (netdev_features_t)features[i].valid << (32 * i);
                wanted |= (netdev_features_t)features[i].requested << (32 * i);
        }

        if (valid & ~NETIF_F_ETHTOOL_BITS)
                return -EINVAL;

        if (valid & ~dev->hw_features) {
                valid &= dev->hw_features;
                ret |= ETHTOOL_F_UNSUPPORTED;
        }

        dev->wanted_features &= ~valid;
        dev->wanted_features |= wanted & valid;
        __netdev_update_features(dev);

        if ((dev->wanted_features ^ dev->features) & valid)
                ret |= ETHTOOL_F_WISH;

        return ret;
}

static int phy_get_sset_count(struct phy_device *phydev)
{
        int ret;

        if (phydev->drv->get_sset_count &&
            phydev->drv->get_strings &&
            phydev->drv->get_stats) {
                mutex_lock(&phydev->lock);
                ret = phydev->drv->get_sset_count(phydev);
                mutex_unlock(&phydev->lock);

                return ret;
        }

        return -EOPNOTSUPP;
}

static int __ethtool_get_sset_count(struct net_device *dev, int sset)
{
        const struct ethtool_ops *ops = dev->ethtool_ops;

        if (sset == ETH_SS_FEATURES)
                return ARRAY_SIZE(netdev_features_strings);

        if (sset == ETH_SS_RSS_HASH_FUNCS)
                return ARRAY_SIZE(rss_hash_func_strings);

        if (sset == ETH_SS_TUNABLES)
                return ARRAY_SIZE(tunable_strings);

        if (sset == ETH_SS_PHY_STATS) {
                if (dev->phydev)
                        return phy_get_sset_count(dev->phydev);
                else
                        return -EOPNOTSUPP;
        }

        if (ops->get_sset_count && ops->get_strings)
                return ops->get_sset_count(dev, sset);
        else
                return -EOPNOTSUPP;
}

static void __ethtool_get_strings(struct net_device *dev,
        u32 stringset, u8 *data)
{
        const struct ethtool_ops *ops = dev->ethtool_ops;

        if (stringset == ETH_SS_FEATURES)
                memcpy(data, netdev_features_strings,
                        sizeof(netdev_features_strings));
        else if (stringset == ETH_SS_RSS_HASH_FUNCS)
                memcpy(data, rss_hash_func_strings,
                       sizeof(rss_hash_func_strings));
        else if (stringset == ETH_SS_TUNABLES)
                memcpy(data, tunable_strings, sizeof(tunable_strings));
        else if (stringset == ETH_SS_PHY_STATS) {
                struct phy_device *phydev = dev->phydev;

                if (phydev) {
                        mutex_lock(&phydev->lock);
                        phydev->drv->get_strings(phydev, data);
                        mutex_unlock(&phydev->lock);
                } else {
                        return;
                }
        } else
                /* ops->get_strings is valid because checked earlier */
                ops->get_strings(dev, stringset, data);
}

static netdev_features_t ethtool_get_feature_mask(u32 eth_cmd)
{
        /* feature masks of legacy discrete ethtool ops */

        switch (eth_cmd) {
        case ETHTOOL_GTXCSUM:
        case ETHTOOL_STXCSUM:
                return NETIF_F_CSUM_MASK | NETIF_F_SCTP_CRC;
        case ETHTOOL_GRXCSUM:
        case ETHTOOL_SRXCSUM:
                return NETIF_F_RXCSUM;
        case ETHTOOL_GSG:
        case ETHTOOL_SSG:
                return NETIF_F_SG;
        case ETHTOOL_GTSO:
        case ETHTOOL_STSO:
                return NETIF_F_ALL_TSO;
        case ETHTOOL_GUFO:
        case ETHTOOL_SUFO:
                return NETIF_F_UFO;
        case ETHTOOL_GGSO:
        case ETHTOOL_SGSO:
                return NETIF_F_GSO;
        case ETHTOOL_GGRO:
        case ETHTOOL_SGRO:
                return NETIF_F_GRO;
        default:
                BUG();
        }
}

static int ethtool_get_one_feature(struct net_device *dev,
        char __user *useraddr, u32 ethcmd)
{
        netdev_features_t mask = ethtool_get_feature_mask(ethcmd);
        struct ethtool_value edata = {
                .cmd = ethcmd,
                .data = !!(dev->features & mask),
        };

        if (copy_to_user(useraddr, &edata, sizeof(edata)))
                return -EFAULT;
        return 0;
}

static int ethtool_set_one_feature(struct net_device *dev,
        void __user *useraddr, u32 ethcmd)
{
        struct ethtool_value edata;
        netdev_features_t mask;

        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;

        mask = ethtool_get_feature_mask(ethcmd);
        mask &= dev->hw_features;
        if (!mask)
                return -EOPNOTSUPP;

        if (edata.data)
                dev->wanted_features |= mask;
        else
                dev->wanted_features &= ~mask;

        __netdev_update_features(dev);

        return 0;
}

#define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
                          ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
#define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
                          NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
                          NETIF_F_RXHASH)

static u32 __ethtool_get_flags(struct net_device *dev)
{
        u32 flags = 0;

        if (dev->features & NETIF_F_LRO)
                flags |= ETH_FLAG_LRO;
        if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
                flags |= ETH_FLAG_RXVLAN;
        if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
                flags |= ETH_FLAG_TXVLAN;
        if (dev->features & NETIF_F_NTUPLE)
                flags |= ETH_FLAG_NTUPLE;
        if (dev->features & NETIF_F_RXHASH)
                flags |= ETH_FLAG_RXHASH;

        return flags;
}

static int __ethtool_set_flags(struct net_device *dev, u32 data)
{
        netdev_features_t features = 0, changed;

        if (data & ~ETH_ALL_FLAGS)
                return -EINVAL;

        if (data & ETH_FLAG_LRO)
                features |= NETIF_F_LRO;
        if (data & ETH_FLAG_RXVLAN)
                features |= NETIF_F_HW_VLAN_CTAG_RX;
        if (data & ETH_FLAG_TXVLAN)
                features |= NETIF_F_HW_VLAN_CTAG_TX;
        if (data & ETH_FLAG_NTUPLE)
                features |= NETIF_F_NTUPLE;
        if (data & ETH_FLAG_RXHASH)
                features |= NETIF_F_RXHASH;

        /* allow changing only bits set in hw_features */
        changed = (features ^ dev->features) & ETH_ALL_FEATURES;
        if (changed & ~dev->hw_features)
                return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;

        dev->wanted_features =
                (dev->wanted_features & ~changed) | (features & changed);

        __netdev_update_features(dev);

        return 0;
}

void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
                                             u32 legacy_u32)
{
        bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
        dst[0] = legacy_u32;
}
EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);

/* return false if src had higher bits set. lower bits always updated. */
bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
                                             const unsigned long *src)
{
        bool retval = true;

        /* TODO: following test will soon always be true */
        if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
                __ETHTOOL_DECLARE_LINK_MODE_MASK(ext);

                bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
                bitmap_fill(ext, 32);
                bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
                if (bitmap_intersects(ext, src,
                                      __ETHTOOL_LINK_MODE_MASK_NBITS)) {
                        /* src mask goes beyond bit 31 */
                        retval = false;
                }
        }
        *legacy_u32 = src[0];
        return retval;
}
EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);

/* return false if legacy contained non-0 deprecated fields
 * transceiver/maxtxpkt/maxrxpkt. rest of ksettings always updated
 */
static bool
convert_legacy_settings_to_link_ksettings(
        struct ethtool_link_ksettings *link_ksettings,
        const struct ethtool_cmd *legacy_settings)
{
        bool retval = true;

        memset(link_ksettings, 0, sizeof(*link_ksettings));

        /* This is used to tell users that driver is still using these
         * deprecated legacy fields, and they should not use
         * %ETHTOOL_GLINKSETTINGS/%ETHTOOL_SLINKSETTINGS
         */
        if (legacy_settings->transceiver ||
            legacy_settings->maxtxpkt ||
            legacy_settings->maxrxpkt)
                retval = false;

        ethtool_convert_legacy_u32_to_link_mode(
                link_ksettings->link_modes.supported,
                legacy_settings->supported);
        ethtool_convert_legacy_u32_to_link_mode(
                link_ksettings->link_modes.advertising,
                legacy_settings->advertising);
        ethtool_convert_legacy_u32_to_link_mode(
                link_ksettings->link_modes.lp_advertising,
                legacy_settings->lp_advertising);
        link_ksettings->base.speed
                = ethtool_cmd_speed(legacy_settings);
        link_ksettings->base.duplex
                = legacy_settings->duplex;
        link_ksettings->base.port
                = legacy_settings->port;
        link_ksettings->base.phy_address
                = legacy_settings->phy_address;
        link_ksettings->base.autoneg
                = legacy_settings->autoneg;
        link_ksettings->base.mdio_support
                = legacy_settings->mdio_support;
        link_ksettings->base.eth_tp_mdix
                = legacy_settings->eth_tp_mdix;
        link_ksettings->base.eth_tp_mdix_ctrl
                = legacy_settings->eth_tp_mdix_ctrl;
        return retval;
}

/* return false if ksettings link modes had higher bits
 * set. legacy_settings always updated (best effort)
 */
static bool
convert_link_ksettings_to_legacy_settings(
        struct ethtool_cmd *legacy_settings,
        const struct ethtool_link_ksettings *link_ksettings)
{
        bool retval = true;

        memset(legacy_settings, 0, sizeof(*legacy_settings));
        /* this also clears the deprecated fields in legacy structure:
         * __u8         transceiver;
         * __u32        maxtxpkt;
         * __u32        maxrxpkt;
         */

        retval &= ethtool_convert_link_mode_to_legacy_u32(
                &legacy_settings->supported,
                link_ksettings->link_modes.supported);
        retval &= ethtool_convert_link_mode_to_legacy_u32(
                &legacy_settings->advertising,
                link_ksettings->link_modes.advertising);
        retval &= ethtool_convert_link_mode_to_legacy_u32(
                &legacy_settings->lp_advertising,
                link_ksettings->link_modes.lp_advertising);
        ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
        legacy_settings->duplex
                = link_ksettings->base.duplex;
        legacy_settings->port
                = link_ksettings->base.port;
        legacy_settings->phy_address
                = link_ksettings->base.phy_address;
        legacy_settings->autoneg
                = link_ksettings->base.autoneg;
        legacy_settings->mdio_support
                = link_ksettings->base.mdio_support;
        legacy_settings->eth_tp_mdix
                = link_ksettings->base.eth_tp_mdix;
        legacy_settings->eth_tp_mdix_ctrl
                = link_ksettings->base.eth_tp_mdix_ctrl;
        return retval;
}

/* number of 32-bit words to store the user's link mode bitmaps */
#define __ETHTOOL_LINK_MODE_MASK_NU32                   \
        DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)

/* layout of the struct passed from/to userland */
struct ethtool_link_usettings {
        struct ethtool_link_settings base;
        struct {
                __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
                __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
                __u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
        } link_modes;
};

/* Internal kernel helper to query a device ethtool_link_settings.
 *
 * Backward compatibility note: for compatibility with legacy drivers
 * that implement only the ethtool_cmd API, this has to work with both
 * drivers implementing get_link_ksettings API and drivers
 * implementing get_settings API. When drivers implement get_settings
 * and report ethtool_cmd deprecated fields
 * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
 * because the resulting struct ethtool_link_settings does not report them.
 */
int __ethtool_get_link_ksettings(struct net_device *dev,
                                 struct ethtool_link_ksettings *link_ksettings)
{
        int err;
        struct ethtool_cmd cmd;

        ASSERT_RTNL();

        if (dev->ethtool_ops->get_link_ksettings) {
                memset(link_ksettings, 0, sizeof(*link_ksettings));
                return dev->ethtool_ops->get_link_ksettings(dev,
                                                            link_ksettings);
        }

        /* driver doesn't support %ethtool_link_ksettings API. revert to
         * legacy %ethtool_cmd API, unless it's not supported either.
         * TODO: remove when ethtool_ops::get_settings disappears internally
         */
        if (!dev->ethtool_ops->get_settings)
                return -EOPNOTSUPP;

        memset(&cmd, 0, sizeof(cmd));
        cmd.cmd = ETHTOOL_GSET;
        err = dev->ethtool_ops->get_settings(dev, &cmd);
        if (err < 0)
                return err;

        /* we ignore deprecated fields transceiver/maxrxpkt/maxtxpkt
         */
        convert_legacy_settings_to_link_ksettings(link_ksettings, &cmd);
        return err;
}
EXPORT_SYMBOL(__ethtool_get_link_ksettings);

/* convert ethtool_link_usettings in user space to a kernel internal
 * ethtool_link_ksettings. return 0 on success, errno on error.
 */
static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
                                         const void __user *from)
{
        struct ethtool_link_usettings link_usettings;

        if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
                return -EFAULT;

        memcpy(&to->base, &link_usettings.base, sizeof(to->base));
        bitmap_from_u32array(to->link_modes.supported,
                             __ETHTOOL_LINK_MODE_MASK_NBITS,
                             link_usettings.link_modes.supported,
                             __ETHTOOL_LINK_MODE_MASK_NU32);
        bitmap_from_u32array(to->link_modes.advertising,
                             __ETHTOOL_LINK_MODE_MASK_NBITS,
                             link_usettings.link_modes.advertising,
                             __ETHTOOL_LINK_MODE_MASK_NU32);
        bitmap_from_u32array(to->link_modes.lp_advertising,
                             __ETHTOOL_LINK_MODE_MASK_NBITS,
                             link_usettings.link_modes.lp_advertising,
                             __ETHTOOL_LINK_MODE_MASK_NU32);

        return 0;
}

/* convert a kernel internal ethtool_link_ksettings to
 * ethtool_link_usettings in user space. return 0 on success, errno on
 * error.
 */
static int
store_link_ksettings_for_user(void __user *to,
                              const struct ethtool_link_ksettings *from)
{
        struct ethtool_link_usettings link_usettings;

        memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
        bitmap_to_u32array(link_usettings.link_modes.supported,
                           __ETHTOOL_LINK_MODE_MASK_NU32,
                           from->link_modes.supported,
                           __ETHTOOL_LINK_MODE_MASK_NBITS);
        bitmap_to_u32array(link_usettings.link_modes.advertising,
                           __ETHTOOL_LINK_MODE_MASK_NU32,
                           from->link_modes.advertising,
                           __ETHTOOL_LINK_MODE_MASK_NBITS);
        bitmap_to_u32array(link_usettings.link_modes.lp_advertising,
                           __ETHTOOL_LINK_MODE_MASK_NU32,
                           from->link_modes.lp_advertising,
                           __ETHTOOL_LINK_MODE_MASK_NBITS);

        if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
                return -EFAULT;

        return 0;
}

/* Query device for its ethtool_link_settings.
 *
 * Backward compatibility note: this function must fail when driver
 * does not implement ethtool::get_link_ksettings, even if legacy
 * ethtool_ops::get_settings is implemented. This tells new versions
 * of ethtool that they should use the legacy API %ETHTOOL_GSET for
 * this driver, so that they can correctly access the ethtool_cmd
 * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 * implements ethtool_ops::get_settings anymore.
 */
static int ethtool_get_link_ksettings(struct net_device *dev,
                                      void __user *useraddr)
{
        int err = 0;
        struct ethtool_link_ksettings link_ksettings;

        ASSERT_RTNL();

        if (!dev->ethtool_ops->get_link_ksettings)
                return -EOPNOTSUPP;

        /* handle bitmap nbits handshake */
        if (copy_from_user(&link_ksettings.base, useraddr,
                           sizeof(link_ksettings.base)))
                return -EFAULT;

        if (__ETHTOOL_LINK_MODE_MASK_NU32
            != link_ksettings.base.link_mode_masks_nwords) {
                /* wrong link mode nbits requested */
                memset(&link_ksettings, 0, sizeof(link_ksettings));
                link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
                /* send back number of words required as negative val */
                compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
                                   "need too many bits for link modes!");
                link_ksettings.base.link_mode_masks_nwords
                        = -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);

                /* copy the base fields back to user, not the link
                 * mode bitmaps
                 */
                if (copy_to_user(useraddr, &link_ksettings.base,
                                 sizeof(link_ksettings.base)))
                        return -EFAULT;

                return 0;
        }

        /* handshake successful: user/kernel agree on
         * link_mode_masks_nwords
         */

        memset(&link_ksettings, 0, sizeof(link_ksettings));
        err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
        if (err < 0)
                return err;

        /* make sure we tell the right values to user */
        link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
        link_ksettings.base.link_mode_masks_nwords
                = __ETHTOOL_LINK_MODE_MASK_NU32;

        return store_link_ksettings_for_user(useraddr, &link_ksettings);
}

/* Update device ethtool_link_settings.
 *
 * Backward compatibility note: this function must fail when driver
 * does not implement ethtool::set_link_ksettings, even if legacy
 * ethtool_ops::set_settings is implemented. This tells new versions
 * of ethtool that they should use the legacy API %ETHTOOL_SSET for
 * this driver, so that they can correctly update the ethtool_cmd
 * deprecated fields (transceiver/maxrxpkt/maxtxpkt), until no driver
 * implements ethtool_ops::get_settings anymore.
 */
static int ethtool_set_link_ksettings(struct net_device *dev,
                                      void __user *useraddr)
{
        int err;
        struct ethtool_link_ksettings link_ksettings;

        ASSERT_RTNL();

        if (!dev->ethtool_ops->set_link_ksettings)
                return -EOPNOTSUPP;

        /* make sure nbits field has expected value */
        if (copy_from_user(&link_ksettings.base, useraddr,
                           sizeof(link_ksettings.base)))
                return -EFAULT;

        if (__ETHTOOL_LINK_MODE_MASK_NU32
            != link_ksettings.base.link_mode_masks_nwords)
                return -EINVAL;

        /* copy the whole structure, now that we know it has expected
         * format
         */
        err = load_link_ksettings_from_user(&link_ksettings, useraddr);
        if (err)
                return err;

        /* re-check nwords field, just in case */
        if (__ETHTOOL_LINK_MODE_MASK_NU32
            != link_ksettings.base.link_mode_masks_nwords)
                return -EINVAL;

        return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
}

static void
warn_incomplete_ethtool_legacy_settings_conversion(const char *details)
{
        char name[sizeof(current->comm)];

        pr_info_once("warning: `%s' uses legacy ethtool link settings API, %s\n",
                     get_task_comm(name, current), details);
}

/* Query device for its ethtool_cmd settings.
 *
 * Backward compatibility note: for compatibility with legacy ethtool,
 * this has to work with both drivers implementing get_link_ksettings
 * API and drivers implementing get_settings API. When drivers
 * implement get_link_ksettings and report higher link mode bits, a
 * kernel warning is logged once (with name of 1st driver/device) to
 * recommend user to upgrade ethtool, but the command is successful
 * (only the lower link mode bits reported back to user).
 */
static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_cmd cmd;

        ASSERT_RTNL();

        if (dev->ethtool_ops->get_link_ksettings) {
                /* First, use link_ksettings API if it is supported */
                int err;
                struct ethtool_link_ksettings link_ksettings;

                memset(&link_ksettings, 0, sizeof(link_ksettings));
                err = dev->ethtool_ops->get_link_ksettings(dev,
                                                           &link_ksettings);
                if (err < 0)
                        return err;
                if (!convert_link_ksettings_to_legacy_settings(&cmd,
                                                               &link_ksettings))
                        warn_incomplete_ethtool_legacy_settings_conversion(
                                "link modes are only partially reported");

                /* send a sensible cmd tag back to user */
                cmd.cmd = ETHTOOL_GSET;
        } else {
                /* driver doesn't support %ethtool_link_ksettings
                 * API. revert to legacy %ethtool_cmd API, unless it's
                 * not supported either.
                 */
                int err;

                if (!dev->ethtool_ops->get_settings)
                        return -EOPNOTSUPP;

                memset(&cmd, 0, sizeof(cmd));
                cmd.cmd = ETHTOOL_GSET;
                err = dev->ethtool_ops->get_settings(dev, &cmd);
                if (err < 0)
                        return err;
        }

        if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
                return -EFAULT;

        return 0;
}

/* Update device link settings with given ethtool_cmd.
 *
 * Backward compatibility note: for compatibility with legacy ethtool,
 * this has to work with both drivers implementing set_link_ksettings
 * API and drivers implementing set_settings API. When drivers
 * implement set_link_ksettings and user's request updates deprecated
 * ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
 * warning is logged once (with name of 1st driver/device) to
 * recommend user to upgrade ethtool, and the request is rejected.
 */
static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_cmd cmd;

        ASSERT_RTNL();

        if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
                return -EFAULT;

        /* first, try new %ethtool_link_ksettings API. */
        if (dev->ethtool_ops->set_link_ksettings) {
                struct ethtool_link_ksettings link_ksettings;

                if (!convert_legacy_settings_to_link_ksettings(&link_ksettings,
                                                               &cmd))
                        return -EINVAL;

                link_ksettings.base.cmd = ETHTOOL_SLINKSETTINGS;
                link_ksettings.base.link_mode_masks_nwords
                        = __ETHTOOL_LINK_MODE_MASK_NU32;
                return dev->ethtool_ops->set_link_ksettings(dev,
                                                            &link_ksettings);
        }

        /* legacy %ethtool_cmd API */

        /* TODO: return -EOPNOTSUPP when ethtool_ops::get_settings
         * disappears internally
         */

        if (!dev->ethtool_ops->set_settings)
                return -EOPNOTSUPP;

        return dev->ethtool_ops->set_settings(dev, &cmd);
}

static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
                                                  void __user *useraddr)
{
        struct ethtool_drvinfo info;
        const struct ethtool_ops *ops = dev->ethtool_ops;

        memset(&info, 0, sizeof(info));
        info.cmd = ETHTOOL_GDRVINFO;
        if (ops->get_drvinfo) {
                ops->get_drvinfo(dev, &info);
        } else if (dev->dev.parent && dev->dev.parent->driver) {
                strlcpy(info.bus_info, dev_name(dev->dev.parent),
                        sizeof(info.bus_info));
                strlcpy(info.driver, dev->dev.parent->driver->name,
                        sizeof(info.driver));
        } else {
                return -EOPNOTSUPP;
        }

        /*
         * this method of obtaining string set info is deprecated;
         * Use ETHTOOL_GSSET_INFO instead.
         */
        if (ops->get_sset_count) {
                int rc;

                rc = ops->get_sset_count(dev, ETH_SS_TEST);
                if (rc >= 0)
                        info.testinfo_len = rc;
                rc = ops->get_sset_count(dev, ETH_SS_STATS);
                if (rc >= 0)
                        info.n_stats = rc;
                rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
                if (rc >= 0)
                        info.n_priv_flags = rc;
        }
        if (ops->get_regs_len)
                info.regdump_len = ops->get_regs_len(dev);
        if (ops->get_eeprom_len)
                info.eedump_len = ops->get_eeprom_len(dev);

        if (copy_to_user(useraddr, &info, sizeof(info)))
                return -EFAULT;
        return 0;
}

static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
                                                    void __user *useraddr)
{
        struct ethtool_sset_info info;
        u64 sset_mask;
        int i, idx = 0, n_bits = 0, ret, rc;
        u32 *info_buf = NULL;

        if (copy_from_user(&info, useraddr, sizeof(info)))
                return -EFAULT;

        /* store copy of mask, because we zero struct later on */
        sset_mask = info.sset_mask;
        if (!sset_mask)
                return 0;

        /* calculate size of return buffer */
        n_bits = hweight64(sset_mask);

        memset(&info, 0, sizeof(info));
        info.cmd = ETHTOOL_GSSET_INFO;

        info_buf = kzalloc(n_bits * sizeof(u32), GFP_USER);
        if (!info_buf)
                return -ENOMEM;

        /*
         * fill return buffer based on input bitmask and successful
         * get_sset_count return
         */
        for (i = 0; i < 64; i++) {
                if (!(sset_mask & (1ULL << i)))
                        continue;

                rc = __ethtool_get_sset_count(dev, i);
                if (rc >= 0) {
                        info.sset_mask |= (1ULL << i);
                        info_buf[idx++] = rc;
                }
        }

        ret = -EFAULT;
        if (copy_to_user(useraddr, &info, sizeof(info)))
                goto out;

        useraddr += offsetof(struct ethtool_sset_info, data);
        if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
                goto out;

        ret = 0;

out:
        kfree(info_buf);
        return ret;
}

static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
                                                u32 cmd, void __user *useraddr)
{
        struct ethtool_rxnfc info;
        size_t info_size = sizeof(info);
        int rc;

        if (!dev->ethtool_ops->set_rxnfc)
                return -EOPNOTSUPP;

        /* struct ethtool_rxnfc was originally defined for
         * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
         * members.  User-space might still be using that
         * definition. */
        if (cmd == ETHTOOL_SRXFH)
                info_size = (offsetof(struct ethtool_rxnfc, data) +
                             sizeof(info.data));

        if (copy_from_user(&info, useraddr, info_size))
                return -EFAULT;

        rc = dev->ethtool_ops->set_rxnfc(dev, &info);
        if (rc)
                return rc;

        if (cmd == ETHTOOL_SRXCLSRLINS &&
            copy_to_user(useraddr, &info, info_size))
                return -EFAULT;

        return 0;
}

static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
                                                u32 cmd, void __user *useraddr)
{
        struct ethtool_rxnfc info;
        size_t info_size = sizeof(info);
        const struct ethtool_ops *ops = dev->ethtool_ops;
        int ret;
        void *rule_buf = NULL;

        if (!ops->get_rxnfc)
                return -EOPNOTSUPP;

        /* struct ethtool_rxnfc was originally defined for
         * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
         * members.  User-space might still be using that
         * definition. */
        if (cmd == ETHTOOL_GRXFH)
                info_size = (offsetof(struct ethtool_rxnfc, data) +
                             sizeof(info.data));

        if (copy_from_user(&info, useraddr, info_size))
                return -EFAULT;

        if (info.cmd == ETHTOOL_GRXCLSRLALL) {
                if (info.rule_cnt > 0) {
                        if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
                                rule_buf = kzalloc(info.rule_cnt * sizeof(u32),
                                                   GFP_USER);
                        if (!rule_buf)
                                return -ENOMEM;
                }
        }

        ret = ops->get_rxnfc(dev, &info, rule_buf);
        if (ret < 0)
                goto err_out;

        ret = -EFAULT;
        if (copy_to_user(useraddr, &info, info_size))
                goto err_out;

        if (rule_buf) {
                useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
                if (copy_to_user(useraddr, rule_buf,
                                 info.rule_cnt * sizeof(u32)))
                        goto err_out;
        }
        ret = 0;

err_out:
        kfree(rule_buf);

        return ret;
}

static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
                                        struct ethtool_rxnfc *rx_rings,
                                        u32 size)
{
        int i;

        if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
                return -EFAULT;

        /* Validate ring indices */
        for (i = 0; i < size; i++)
                if (indir[i] >= rx_rings->data)
                        return -EINVAL;

        return 0;
}

u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;

void netdev_rss_key_fill(void *buffer, size_t len)
{
        BUG_ON(len > sizeof(netdev_rss_key));
        net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
        memcpy(buffer, netdev_rss_key, len);
}
EXPORT_SYMBOL(netdev_rss_key_fill);

static int ethtool_get_max_rxfh_channel(struct net_device *dev, u32 *max)
{
        u32 dev_size, current_max = 0;
        u32 *indir;
        int ret;

        if (!dev->ethtool_ops->get_rxfh_indir_size ||
            !dev->ethtool_ops->get_rxfh)
                return -EOPNOTSUPP;
        dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
        if (dev_size == 0)
                return -EOPNOTSUPP;

        indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
        if (!indir)
                return -ENOMEM;

        ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
        if (ret)
                goto out;

        while (dev_size--)
                current_max = max(current_max, indir[dev_size]);

        *max = current_max;

out:
        kfree(indir);
        return ret;
}

static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
                                                     void __user *useraddr)
{
        u32 user_size, dev_size;
        u32 *indir;
        int ret;

        if (!dev->ethtool_ops->get_rxfh_indir_size ||
            !dev->ethtool_ops->get_rxfh)
                return -EOPNOTSUPP;
        dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
        if (dev_size == 0)
                return -EOPNOTSUPP;

        if (copy_from_user(&user_size,
                           useraddr + offsetof(struct ethtool_rxfh_indir, size),
                           sizeof(user_size)))
                return -EFAULT;

        if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh_indir, size),
                         &dev_size, sizeof(dev_size)))
                return -EFAULT;

        /* If the user buffer size is 0, this is just a query for the
         * device table size.  Otherwise, if it's smaller than the
         * device table size it's an error.
         */
        if (user_size < dev_size)
                return user_size == 0 ? 0 : -EINVAL;

        indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
        if (!indir)
                return -ENOMEM;

        ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
        if (ret)
                goto out;

        if (copy_to_user(useraddr +
                         offsetof(struct ethtool_rxfh_indir, ring_index[0]),
                         indir, dev_size * sizeof(indir[0])))
                ret = -EFAULT;

out:
        kfree(indir);
        return ret;
}

static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
                                                     void __user *useraddr)
{
        struct ethtool_rxnfc rx_rings;
        u32 user_size, dev_size, i;
        u32 *indir;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        int ret;
        u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);

        if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
            !ops->get_rxnfc)
                return -EOPNOTSUPP;

        dev_size = ops->get_rxfh_indir_size(dev);
        if (dev_size == 0)
                return -EOPNOTSUPP;

        if (copy_from_user(&user_size,
                           useraddr + offsetof(struct ethtool_rxfh_indir, size),
                           sizeof(user_size)))
                return -EFAULT;

        if (user_size != 0 && user_size != dev_size)
                return -EINVAL;

        indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
        if (!indir)
                return -ENOMEM;

        rx_rings.cmd = ETHTOOL_GRXRINGS;
        ret = ops->get_rxnfc(dev, &rx_rings, NULL);
        if (ret)
                goto out;

        if (user_size == 0) {
                for (i = 0; i < dev_size; i++)
                        indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
        } else {
                ret = ethtool_copy_validate_indir(indir,
                                                  useraddr + ringidx_offset,
                                                  &rx_rings,
                                                  dev_size);
                if (ret)
                        goto out;
        }

        ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
        if (ret)
                goto out;

        /* indicate whether rxfh was set to default */
        if (user_size == 0)
                dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
        else
                dev->priv_flags |= IFF_RXFH_CONFIGURED;

out:
        kfree(indir);
        return ret;
}

static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
                                               void __user *useraddr)
{
        int ret;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        u32 user_indir_size, user_key_size;
        u32 dev_indir_size = 0, dev_key_size = 0;
        struct ethtool_rxfh rxfh;
        u32 total_size;
        u32 indir_bytes;
        u32 *indir = NULL;
        u8 dev_hfunc = 0;
        u8 *hkey = NULL;
        u8 *rss_config;

        if (!ops->get_rxfh)
                return -EOPNOTSUPP;

        if (ops->get_rxfh_indir_size)
                dev_indir_size = ops->get_rxfh_indir_size(dev);
        if (ops->get_rxfh_key_size)
                dev_key_size = ops->get_rxfh_key_size(dev);

        if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
                return -EFAULT;
        user_indir_size = rxfh.indir_size;
        user_key_size = rxfh.key_size;

        /* Check that reserved fields are 0 for now */
        if (rxfh.rss_context || rxfh.rsvd8[0] || rxfh.rsvd8[1] ||
            rxfh.rsvd8[2] || rxfh.rsvd32)
                return -EINVAL;

        rxfh.indir_size = dev_indir_size;
        rxfh.key_size = dev_key_size;
        if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
                return -EFAULT;

        if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
            (user_key_size && (user_key_size != dev_key_size)))
                return -EINVAL;

        indir_bytes = user_indir_size * sizeof(indir[0]);
        total_size = indir_bytes + user_key_size;
        rss_config = kzalloc(total_size, GFP_USER);
        if (!rss_config)
                return -ENOMEM;

        if (user_indir_size)
                indir = (u32 *)rss_config;

        if (user_key_size)
                hkey = rss_config + indir_bytes;

        ret = dev->ethtool_ops->get_rxfh(dev, indir, hkey, &dev_hfunc);
        if (ret)
                goto out;

        if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, hfunc),
                         &dev_hfunc, sizeof(rxfh.hfunc))) {
                ret = -EFAULT;
        } else if (copy_to_user(useraddr +
                              offsetof(struct ethtool_rxfh, rss_config[0]),
                              rss_config, total_size)) {
                ret = -EFAULT;
        }
out:
        kfree(rss_config);

        return ret;
}

static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
                                               void __user *useraddr)
{
        int ret;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        struct ethtool_rxnfc rx_rings;
        struct ethtool_rxfh rxfh;
        u32 dev_indir_size = 0, dev_key_size = 0, i;
        u32 *indir = NULL, indir_bytes = 0;
        u8 *hkey = NULL;
        u8 *rss_config;
        u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);

        if (!ops->get_rxnfc || !ops->set_rxfh)
                return -EOPNOTSUPP;

        if (ops->get_rxfh_indir_size)
                dev_indir_size = ops->get_rxfh_indir_size(dev);
        if (ops->get_rxfh_key_size)
                dev_key_size = ops->get_rxfh_key_size(dev);

        if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
                return -EFAULT;

        /* Check that reserved fields are 0 for now */
        if (rxfh.rss_context || rxfh.rsvd8[0] || rxfh.rsvd8[1] ||
            rxfh.rsvd8[2] || rxfh.rsvd32)
                return -EINVAL;

        /* If either indir, hash key or function is valid, proceed further.
         * Must request at least one change: indir size, hash key or function.
         */
        if ((rxfh.indir_size &&
             rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
             rxfh.indir_size != dev_indir_size) ||
            (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
            (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
             rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
                return -EINVAL;

        if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
                indir_bytes = dev_indir_size * sizeof(indir[0]);

        rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
        if (!rss_config)
                return -ENOMEM;

        rx_rings.cmd = ETHTOOL_GRXRINGS;
        ret = ops->get_rxnfc(dev, &rx_rings, NULL);
        if (ret)
                goto out;

        /* rxfh.indir_size == 0 means reset the indir table to default.
         * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
         */
        if (rxfh.indir_size &&
            rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
                indir = (u32 *)rss_config;
                ret = ethtool_copy_validate_indir(indir,
                                                  useraddr + rss_cfg_offset,
                                                  &rx_rings,
                                                  rxfh.indir_size);
                if (ret)
                        goto out;
        } else if (rxfh.indir_size == 0) {
                indir = (u32 *)rss_config;
                for (i = 0; i < dev_indir_size; i++)
                        indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
        }

        if (rxfh.key_size) {
                hkey = rss_config + indir_bytes;
                if (copy_from_user(hkey,
                                   useraddr + rss_cfg_offset + indir_bytes,
                                   rxfh.key_size)) {
                        ret = -EFAULT;
                        goto out;
                }
        }

        ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
        if (ret)
                goto out;

        /* indicate whether rxfh was set to default */
        if (rxfh.indir_size == 0)
                dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
        else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
                dev->priv_flags |= IFF_RXFH_CONFIGURED;

out:
        kfree(rss_config);
        return ret;
}

static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_regs regs;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        void *regbuf;
        int reglen, ret;

        if (!ops->get_regs || !ops->get_regs_len)
                return -EOPNOTSUPP;

        if (copy_from_user(&regs, useraddr, sizeof(regs)))
                return -EFAULT;

        reglen = ops->get_regs_len(dev);
        if (regs.len > reglen)
                regs.len = reglen;

        regbuf = vzalloc(reglen);
        if (reglen && !regbuf)
                return -ENOMEM;

        ops->get_regs(dev, &regs, regbuf);

        ret = -EFAULT;
        if (copy_to_user(useraddr, &regs, sizeof(regs)))
                goto out;
        useraddr += offsetof(struct ethtool_regs, data);
        if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
                goto out;
        ret = 0;

 out:
        vfree(regbuf);
        return ret;
}

static int ethtool_reset(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_value reset;
        int ret;

        if (!dev->ethtool_ops->reset)
                return -EOPNOTSUPP;

        if (copy_from_user(&reset, useraddr, sizeof(reset)))
                return -EFAULT;

        ret = dev->ethtool_ops->reset(dev, &reset.data);
        if (ret)
                return ret;

        if (copy_to_user(useraddr, &reset, sizeof(reset)))
                return -EFAULT;
        return 0;
}

static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };

        if (!dev->ethtool_ops->get_wol)
                return -EOPNOTSUPP;

        dev->ethtool_ops->get_wol(dev, &wol);

        if (copy_to_user(useraddr, &wol, sizeof(wol)))
                return -EFAULT;
        return 0;
}

static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_wolinfo wol;

        if (!dev->ethtool_ops->set_wol)
                return -EOPNOTSUPP;

        if (copy_from_user(&wol, useraddr, sizeof(wol)))
                return -EFAULT;

        return dev->ethtool_ops->set_wol(dev, &wol);
}

static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_eee edata;
        int rc;

        if (!dev->ethtool_ops->get_eee)
                return -EOPNOTSUPP;

        memset(&edata, 0, sizeof(struct ethtool_eee));
        edata.cmd = ETHTOOL_GEEE;
        rc = dev->ethtool_ops->get_eee(dev, &edata);

        if (rc)
                return rc;

        if (copy_to_user(useraddr, &edata, sizeof(edata)))
                return -EFAULT;

        return 0;
}

static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_eee edata;

        if (!dev->ethtool_ops->set_eee)
                return -EOPNOTSUPP;

        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;

        return dev->ethtool_ops->set_eee(dev, &edata);
}

static int ethtool_nway_reset(struct net_device *dev)
{
        if (!dev->ethtool_ops->nway_reset)
                return -EOPNOTSUPP;

        return dev->ethtool_ops->nway_reset(dev);
}

static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };

        if (!dev->ethtool_ops->get_link)
                return -EOPNOTSUPP;

        edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);

        if (copy_to_user(useraddr, &edata, sizeof(edata)))
                return -EFAULT;
        return 0;
}

static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
                                  int (*getter)(struct net_device *,
                                                struct ethtool_eeprom *, u8 *),
                                  u32 total_len)
{
        struct ethtool_eeprom eeprom;
        void __user *userbuf = useraddr + sizeof(eeprom);
        u32 bytes_remaining;
        u8 *data;
        int ret = 0;

        if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
                return -EFAULT;

        /* Check for wrap and zero */
        if (eeprom.offset + eeprom.len <= eeprom.offset)
                return -EINVAL;

        /* Check for exceeding total eeprom len */
        if (eeprom.offset + eeprom.len > total_len)
                return -EINVAL;

        data = kmalloc(PAGE_SIZE, GFP_USER);
        if (!data)
                return -ENOMEM;

        bytes_remaining = eeprom.len;
        while (bytes_remaining > 0) {
                eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);

                ret = getter(dev, &eeprom, data);
                if (ret)
                        break;
                if (copy_to_user(userbuf, data, eeprom.len)) {
                        ret = -EFAULT;
                        break;
                }
                userbuf += eeprom.len;
                eeprom.offset += eeprom.len;
                bytes_remaining -= eeprom.len;
        }

        eeprom.len = userbuf - (useraddr + sizeof(eeprom));
        eeprom.offset -= eeprom.len;
        if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
                ret = -EFAULT;

        kfree(data);
        return ret;
}

static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
        const struct ethtool_ops *ops = dev->ethtool_ops;

        if (!ops->get_eeprom || !ops->get_eeprom_len ||
            !ops->get_eeprom_len(dev))
                return -EOPNOTSUPP;

        return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
                                      ops->get_eeprom_len(dev));
}

static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_eeprom eeprom;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        void __user *userbuf = useraddr + sizeof(eeprom);
        u32 bytes_remaining;
        u8 *data;
        int ret = 0;

        if (!ops->set_eeprom || !ops->get_eeprom_len ||
            !ops->get_eeprom_len(dev))
                return -EOPNOTSUPP;

        if (copy_from_user(&eeprom, useraddr, sizeof(eeprom)))
                return -EFAULT;

        /* Check for wrap and zero */
        if (eeprom.offset + eeprom.len <= eeprom.offset)
                return -EINVAL;

        /* Check for exceeding total eeprom len */
        if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
                return -EINVAL;

        data = kmalloc(PAGE_SIZE, GFP_USER);
        if (!data)
                return -ENOMEM;

        bytes_remaining = eeprom.len;
        while (bytes_remaining > 0) {
                eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);

                if (copy_from_user(data, userbuf, eeprom.len)) {
                        ret = -EFAULT;
                        break;
                }
                ret = ops->set_eeprom(dev, &eeprom, data);
                if (ret)
                        break;
                userbuf += eeprom.len;
                eeprom.offset += eeprom.len;
                bytes_remaining -= eeprom.len;
        }

        kfree(data);
        return ret;
}

static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
                                                   void __user *useraddr)
{
        struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };

        if (!dev->ethtool_ops->get_coalesce)
                return -EOPNOTSUPP;

        dev->ethtool_ops->get_coalesce(dev, &coalesce);

        if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
                return -EFAULT;
        return 0;
}

static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
                                                   void __user *useraddr)
{
        struct ethtool_coalesce coalesce;

        if (!dev->ethtool_ops->set_coalesce)
                return -EOPNOTSUPP;

        if (copy_from_user(&coalesce, useraddr, sizeof(coalesce)))
                return -EFAULT;

        return dev->ethtool_ops->set_coalesce(dev, &coalesce);
}

static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };

        if (!dev->ethtool_ops->get_ringparam)
                return -EOPNOTSUPP;

        dev->ethtool_ops->get_ringparam(dev, &ringparam);

        if (copy_to_user(useraddr, &ringparam, sizeof(ringparam)))
                return -EFAULT;
        return 0;
}

static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_ringparam ringparam;

        if (!dev->ethtool_ops->set_ringparam)
                return -EOPNOTSUPP;

        if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
                return -EFAULT;

        return dev->ethtool_ops->set_ringparam(dev, &ringparam);
}

static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
                                                   void __user *useraddr)
{
        struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };

        if (!dev->ethtool_ops->get_channels)
                return -EOPNOTSUPP;

        dev->ethtool_ops->get_channels(dev, &channels);

        if (copy_to_user(useraddr, &channels, sizeof(channels)))
                return -EFAULT;
        return 0;
}

static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
                                                   void __user *useraddr)
{
        struct ethtool_channels channels, max;
        u32 max_rx_in_use = 0;

        if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
                return -EOPNOTSUPP;

        if (copy_from_user(&channels, useraddr, sizeof(channels)))
                return -EFAULT;

        dev->ethtool_ops->get_channels(dev, &max);

        /* ensure new counts are within the maximums */
        if ((channels.rx_count > max.max_rx) ||
            (channels.tx_count > max.max_tx) ||
            (channels.combined_count > max.max_combined) ||
            (channels.other_count > max.max_other))
                return -EINVAL;

        /* ensure the new Rx count fits within the configured Rx flow
         * indirection table settings */
        if (netif_is_rxfh_configured(dev) &&
            !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
            (channels.combined_count + channels.rx_count) <= max_rx_in_use)
            return -EINVAL;

        return dev->ethtool_ops->set_channels(dev, &channels);
}

static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };

        if (!dev->ethtool_ops->get_pauseparam)
                return -EOPNOTSUPP;

        dev->ethtool_ops->get_pauseparam(dev, &pauseparam);

        if (copy_to_user(useraddr, &pauseparam, sizeof(pauseparam)))
                return -EFAULT;
        return 0;
}

static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_pauseparam pauseparam;

        if (!dev->ethtool_ops->set_pauseparam)
                return -EOPNOTSUPP;

        if (copy_from_user(&pauseparam, useraddr, sizeof(pauseparam)))
                return -EFAULT;

        return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
}

static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_test test;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        u64 *data;
        int ret, test_len;

        if (!ops->self_test || !ops->get_sset_count)
                return -EOPNOTSUPP;

        test_len = ops->get_sset_count(dev, ETH_SS_TEST);
        if (test_len < 0)
                return test_len;
        WARN_ON(test_len == 0);

        if (copy_from_user(&test, useraddr, sizeof(test)))
                return -EFAULT;

        test.len = test_len;
        data = kmalloc(test_len * sizeof(u64), GFP_USER);
        if (!data)
                return -ENOMEM;

        ops->self_test(dev, &test, data);

        ret = -EFAULT;
        if (copy_to_user(useraddr, &test, sizeof(test)))
                goto out;
        useraddr += sizeof(test);
        if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
                goto out;
        ret = 0;

 out:
        kfree(data);
        return ret;
}

static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_gstrings gstrings;
        u8 *data;
        int ret;

        if (copy_from_user(&gstrings, useraddr, sizeof(gstrings)))
                return -EFAULT;

        ret = __ethtool_get_sset_count(dev, gstrings.string_set);
        if (ret < 0)
                return ret;

        gstrings.len = ret;

        data = kcalloc(gstrings.len, ETH_GSTRING_LEN, GFP_USER);
        if (!data)
                return -ENOMEM;

        __ethtool_get_strings(dev, gstrings.string_set, data);

        ret = -EFAULT;
        if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
                goto out;
        useraddr += sizeof(gstrings);
        if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
                goto out;
        ret = 0;

out:
        kfree(data);
        return ret;
}

static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_value id;
        static bool busy;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        int rc;

        if (!ops->set_phys_id)
                return -EOPNOTSUPP;

        if (busy)
                return -EBUSY;

        if (copy_from_user(&id, useraddr, sizeof(id)))
                return -EFAULT;

        rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
        if (rc < 0)
                return rc;

        /* Drop the RTNL lock while waiting, but prevent reentry or
         * removal of the device.
         */
        busy = true;
        dev_hold(dev);
        rtnl_unlock();

        if (rc == 0) {
                /* Driver will handle this itself */
                schedule_timeout_interruptible(
                        id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
        } else {
                /* Driver expects to be called at twice the frequency in rc */
                int n = rc * 2, i, interval = HZ / n;

                /* Count down seconds */
                do {
                        /* Count down iterations per second */
                        i = n;
                        do {
                                rtnl_lock();
                                rc = ops->set_phys_id(dev,
                                    (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
                                rtnl_unlock();
                                if (rc)
                                        break;
                                schedule_timeout_interruptible(interval);
                        } while (!signal_pending(current) && --i != 0);
                } while (!signal_pending(current) &&
                         (id.data == 0 || --id.data != 0));
        }

        rtnl_lock();
        dev_put(dev);
        busy = false;

        (void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
        return rc;
}

static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_stats stats;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        u64 *data;
        int ret, n_stats;

        if (!ops->get_ethtool_stats || !ops->get_sset_count)
                return -EOPNOTSUPP;

        n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
        if (n_stats < 0)
                return n_stats;
        WARN_ON(n_stats == 0);

        if (copy_from_user(&stats, useraddr, sizeof(stats)))
                return -EFAULT;

        stats.n_stats = n_stats;
        data = kmalloc(n_stats * sizeof(u64), GFP_USER);
        if (!data)
                return -ENOMEM;

        ops->get_ethtool_stats(dev, &stats, data);

        ret = -EFAULT;
        if (copy_to_user(useraddr, &stats, sizeof(stats)))
                goto out;
        useraddr += sizeof(stats);
        if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
                goto out;
        ret = 0;

 out:
        kfree(data);
        return ret;
}

static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_stats stats;
        struct phy_device *phydev = dev->phydev;
        u64 *data;
        int ret, n_stats;

        if (!phydev)
                return -EOPNOTSUPP;

        n_stats = phy_get_sset_count(phydev);

        if (n_stats < 0)
                return n_stats;
        WARN_ON(n_stats == 0);

        if (copy_from_user(&stats, useraddr, sizeof(stats)))
                return -EFAULT;

        stats.n_stats = n_stats;
        data = kmalloc_array(n_stats, sizeof(u64), GFP_USER);
        if (!data)
                return -ENOMEM;

        mutex_lock(&phydev->lock);
        phydev->drv->get_stats(phydev, &stats, data);
        mutex_unlock(&phydev->lock);

        ret = -EFAULT;
        if (copy_to_user(useraddr, &stats, sizeof(stats)))
                goto out;
        useraddr += sizeof(stats);
        if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
                goto out;
        ret = 0;

 out:
        kfree(data);
        return ret;
}

static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_perm_addr epaddr;

        if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
                return -EFAULT;

        if (epaddr.size < dev->addr_len)
                return -ETOOSMALL;
        epaddr.size = dev->addr_len;

        if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
                return -EFAULT;
        useraddr += sizeof(epaddr);
        if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
                return -EFAULT;
        return 0;
}

static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
                             u32 cmd, u32 (*actor)(struct net_device *))
{
        struct ethtool_value edata = { .cmd = cmd };

        if (!actor)
                return -EOPNOTSUPP;

        edata.data = actor(dev);

        if (copy_to_user(useraddr, &edata, sizeof(edata)))
                return -EFAULT;

        return 0;
}

static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
                             void (*actor)(struct net_device *, u32))
{
        struct ethtool_value edata;

        if (!actor)
                return -EOPNOTSUPP;

        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;

        actor(dev, edata.data);
        return 0;
}

static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
                             int (*actor)(struct net_device *, u32))
{
        struct ethtool_value edata;

        if (!actor)
                return -EOPNOTSUPP;

        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;

        return actor(dev, edata.data);
}

static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
                                                   char __user *useraddr)
{
        struct ethtool_flash efl;

        if (copy_from_user(&efl, useraddr, sizeof(efl)))
                return -EFAULT;

        if (!dev->ethtool_ops->flash_device)
                return -EOPNOTSUPP;

        efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;

        return dev->ethtool_ops->flash_device(dev, &efl);
}

static int ethtool_set_dump(struct net_device *dev,
                        void __user *useraddr)
{
        struct ethtool_dump dump;

        if (!dev->ethtool_ops->set_dump)
                return -EOPNOTSUPP;

        if (copy_from_user(&dump, useraddr, sizeof(dump)))
                return -EFAULT;

        return dev->ethtool_ops->set_dump(dev, &dump);
}

static int ethtool_get_dump_flag(struct net_device *dev,
                                void __user *useraddr)
{
        int ret;
        struct ethtool_dump dump;
        const struct ethtool_ops *ops = dev->ethtool_ops;

        if (!ops->get_dump_flag)
                return -EOPNOTSUPP;

        if (copy_from_user(&dump, useraddr, sizeof(dump)))
                return -EFAULT;

        ret = ops->get_dump_flag(dev, &dump);
        if (ret)
                return ret;

        if (copy_to_user(useraddr, &dump, sizeof(dump)))
                return -EFAULT;
        return 0;
}

static int ethtool_get_dump_data(struct net_device *dev,
                                void __user *useraddr)
{
        int ret;
        __u32 len;
        struct ethtool_dump dump, tmp;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        void *data = NULL;

        if (!ops->get_dump_data || !ops->get_dump_flag)
                return -EOPNOTSUPP;

        if (copy_from_user(&dump, useraddr, sizeof(dump)))
                return -EFAULT;

        memset(&tmp, 0, sizeof(tmp));
        tmp.cmd = ETHTOOL_GET_DUMP_FLAG;
        ret = ops->get_dump_flag(dev, &tmp);
        if (ret)
                return ret;

        len = min(tmp.len, dump.len);
        if (!len)
                return -EFAULT;

        /* Don't ever let the driver think there's more space available
         * than it requested with .get_dump_flag().
         */
        dump.len = len;

        /* Always allocate enough space to hold the whole thing so that the
         * driver does not need to check the length and bother with partial
         * dumping.
         */
        data = vzalloc(tmp.len);
        if (!data)
                return -ENOMEM;
        ret = ops->get_dump_data(dev, &dump, data);
        if (ret)
                goto out;

        /* There are two sane possibilities:
         * 1. The driver's .get_dump_data() does not touch dump.len.
         * 2. Or it may set dump.len to how much it really writes, which
         *    should be tmp.len (or len if it can do a partial dump).
         * In any case respond to userspace with the actual length of data
         * it's receiving.
         */
        WARN_ON(dump.len != len && dump.len != tmp.len);
        dump.len = len;

        if (copy_to_user(useraddr, &dump, sizeof(dump))) {
                ret = -EFAULT;
                goto out;
        }
        useraddr += offsetof(struct ethtool_dump, data);
        if (copy_to_user(useraddr, data, len))
                ret = -EFAULT;
out:
        vfree(data);
        return ret;
}

static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
{
        int err = 0;
        struct ethtool_ts_info info;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        struct phy_device *phydev = dev->phydev;

        memset(&info, 0, sizeof(info));
        info.cmd = ETHTOOL_GET_TS_INFO;

        if (phydev && phydev->drv && phydev->drv->ts_info) {
                err = phydev->drv->ts_info(phydev, &info);
        } else if (ops->get_ts_info) {
                err = ops->get_ts_info(dev, &info);
        } else {
                info.so_timestamping =
                        SOF_TIMESTAMPING_RX_SOFTWARE |
                        SOF_TIMESTAMPING_SOFTWARE;
                info.phc_index = -1;
        }

        if (err)
                return err;

        if (copy_to_user(useraddr, &info, sizeof(info)))
                err = -EFAULT;

        return err;
}

static int __ethtool_get_module_info(struct net_device *dev,
                                     struct ethtool_modinfo *modinfo)
{
        const struct ethtool_ops *ops = dev->ethtool_ops;
        struct phy_device *phydev = dev->phydev;

        if (phydev && phydev->drv && phydev->drv->module_info)
                return phydev->drv->module_info(phydev, modinfo);

        if (ops->get_module_info)
                return ops->get_module_info(dev, modinfo);

        return -EOPNOTSUPP;
}

static int ethtool_get_module_info(struct net_device *dev,
                                   void __user *useraddr)
{
        int ret;
        struct ethtool_modinfo modinfo;

        if (copy_from_user(&modinfo, useraddr, sizeof(modinfo)))
                return -EFAULT;

        ret = __ethtool_get_module_info(dev, &modinfo);
        if (ret)
                return ret;

        if (copy_to_user(useraddr, &modinfo, sizeof(modinfo)))
                return -EFAULT;

        return 0;
}

static int __ethtool_get_module_eeprom(struct net_device *dev,
                                       struct ethtool_eeprom *ee, u8 *data)
{
        const struct ethtool_ops *ops = dev->ethtool_ops;
        struct phy_device *phydev = dev->phydev;

        if (phydev && phydev->drv && phydev->drv->module_eeprom)
                return phydev->drv->module_eeprom(phydev, ee, data);

        if (ops->get_module_eeprom)
                return ops->get_module_eeprom(dev, ee, data);

        return -EOPNOTSUPP;
}

static int ethtool_get_module_eeprom(struct net_device *dev,
                                     void __user *useraddr)
{
        int ret;
        struct ethtool_modinfo modinfo;

        ret = __ethtool_get_module_info(dev, &modinfo);
        if (ret)
                return ret;

        return ethtool_get_any_eeprom(dev, useraddr,
                                      __ethtool_get_module_eeprom,
                                      modinfo.eeprom_len);
}

static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
{
        switch (tuna->id) {
        case ETHTOOL_RX_COPYBREAK:
        case ETHTOOL_TX_COPYBREAK:
                if (tuna->len != sizeof(u32) ||
                    tuna->type_id != ETHTOOL_TUNABLE_U32)
                        return -EINVAL;
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
{
        int ret;
        struct ethtool_tunable tuna;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        void *data;

        if (!ops->get_tunable)
                return -EOPNOTSUPP;
        if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
                return -EFAULT;
        ret = ethtool_tunable_valid(&tuna);
        if (ret)
                return ret;
        data = kmalloc(tuna.len, GFP_USER);
        if (!data)
                return -ENOMEM;
        ret = ops->get_tunable(dev, &tuna, data);
        if (ret)
                goto out;
        useraddr += sizeof(tuna);
        ret = -EFAULT;
        if (copy_to_user(useraddr, data, tuna.len))
                goto out;
        ret = 0;

out:
        kfree(data);
        return ret;
}

static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
{
        int ret;
        struct ethtool_tunable tuna;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        void *data;

        if (!ops->set_tunable)
                return -EOPNOTSUPP;
        if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
                return -EFAULT;
        ret = ethtool_tunable_valid(&tuna);
        if (ret)
                return ret;
        data = kmalloc(tuna.len, GFP_USER);
        if (!data)
                return -ENOMEM;
        useraddr += sizeof(tuna);
        ret = -EFAULT;
        if (copy_from_user(data, useraddr, tuna.len))
                goto out;
        ret = ops->set_tunable(dev, &tuna, data);

out:
        kfree(data);
        return ret;
}

static int ethtool_get_per_queue_coalesce(struct net_device *dev,
                                          void __user *useraddr,
                                          struct ethtool_per_queue_op *per_queue_opt)
{
        u32 bit;
        int ret;
        DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);

        if (!dev->ethtool_ops->get_per_queue_coalesce)
                return -EOPNOTSUPP;

        useraddr += sizeof(*per_queue_opt);

        bitmap_from_u32array(queue_mask,
                             MAX_NUM_QUEUE,
                             per_queue_opt->queue_mask,
                             DIV_ROUND_UP(MAX_NUM_QUEUE, 32));

        for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
                struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };

                ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, &coalesce);
                if (ret != 0)
                        return ret;
                if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
                        return -EFAULT;
                useraddr += sizeof(coalesce);
        }

        return 0;
}

static int ethtool_set_per_queue_coalesce(struct net_device *dev,
                                          void __user *useraddr,
                                          struct ethtool_per_queue_op *per_queue_opt)
{
        u32 bit;
        int i, ret = 0;
        int n_queue;
        struct ethtool_coalesce *backup = NULL, *tmp = NULL;
        DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);

        if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
            (!dev->ethtool_ops->get_per_queue_coalesce))
                return -EOPNOTSUPP;

        useraddr += sizeof(*per_queue_opt);

        bitmap_from_u32array(queue_mask,
                             MAX_NUM_QUEUE,
                             per_queue_opt->queue_mask,
                             DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
        n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
        tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
        if (!backup)
                return -ENOMEM;

        for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
                struct ethtool_coalesce coalesce;

                ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
                if (ret != 0)
                        goto roll_back;

                tmp++;

                if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
                        ret = -EFAULT;
                        goto roll_back;
                }

                ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
                if (ret != 0)
                        goto roll_back;

                useraddr += sizeof(coalesce);
        }

roll_back:
        if (ret != 0) {
                tmp = backup;
                for_each_set_bit(i, queue_mask, bit) {
                        dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
                        tmp++;
                }
        }
        kfree(backup);

        return ret;
}

static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_per_queue_op per_queue_opt;

        if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
                return -EFAULT;

        switch (per_queue_opt.sub_command) {
        case ETHTOOL_GCOALESCE:
                return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
        case ETHTOOL_SCOALESCE:
                return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
        default:
                return -EOPNOTSUPP;
        };
}

/* The main entry point in this file.  Called from net/core/dev_ioctl.c */

int dev_ethtool(struct net *net, struct ifreq *ifr)
{
        struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
        void __user *useraddr = ifr->ifr_data;
        u32 ethcmd, sub_cmd;
        int rc;
        netdev_features_t old_features;

        if (!dev || !netif_device_present(dev))
                return -ENODEV;

        if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
                return -EFAULT;

        if (ethcmd == ETHTOOL_PERQUEUE) {
                if (copy_from_user(&sub_cmd, useraddr + sizeof(ethcmd), sizeof(sub_cmd)))
                        return -EFAULT;
        } else {
                sub_cmd = ethcmd;
        }
        /* Allow some commands to be done by anyone */
        switch (sub_cmd) {
        case ETHTOOL_GSET:
        case ETHTOOL_GDRVINFO:
        case ETHTOOL_GMSGLVL:
        case ETHTOOL_GLINK:
        case ETHTOOL_GCOALESCE:
        case ETHTOOL_GRINGPARAM:
        case ETHTOOL_GPAUSEPARAM:
        case ETHTOOL_GRXCSUM:
        case ETHTOOL_GTXCSUM:
        case ETHTOOL_GSG:
        case ETHTOOL_GSSET_INFO:
        case ETHTOOL_GSTRINGS:
        case ETHTOOL_GSTATS:
        case ETHTOOL_GPHYSTATS:
        case ETHTOOL_GTSO:
        case ETHTOOL_GPERMADDR:
        case ETHTOOL_GUFO:
        case ETHTOOL_GGSO:
        case ETHTOOL_GGRO:
        case ETHTOOL_GFLAGS:
        case ETHTOOL_GPFLAGS:
        case ETHTOOL_GRXFH:
        case ETHTOOL_GRXRINGS:
        case ETHTOOL_GRXCLSRLCNT:
        case ETHTOOL_GRXCLSRULE:
        case ETHTOOL_GRXCLSRLALL:
        case ETHTOOL_GRXFHINDIR:
        case ETHTOOL_GRSSH:
        case ETHTOOL_GFEATURES:
        case ETHTOOL_GCHANNELS:
        case ETHTOOL_GET_TS_INFO:
        case ETHTOOL_GEEE:
        case ETHTOOL_GTUNABLE:
        case ETHTOOL_GLINKSETTINGS:
                break;
        default:
                if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
                        return -EPERM;
        }

        if (dev->ethtool_ops->begin) {
                rc = dev->ethtool_ops->begin(dev);
                if (rc  < 0)
                        return rc;
        }
        old_features = dev->features;

        switch (ethcmd) {
        case ETHTOOL_GSET:
                rc = ethtool_get_settings(dev, useraddr);
                break;
        case ETHTOOL_SSET:
                rc = ethtool_set_settings(dev, useraddr);
                break;
        case ETHTOOL_GDRVINFO:
                rc = ethtool_get_drvinfo(dev, useraddr);
                break;
        case ETHTOOL_GREGS:
                rc = ethtool_get_regs(dev, useraddr);
                break;
        case ETHTOOL_GWOL:
                rc = ethtool_get_wol(dev, useraddr);
                break;
        case ETHTOOL_SWOL:
                rc = ethtool_set_wol(dev, useraddr);
                break;
        case ETHTOOL_GMSGLVL:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_msglevel);
                break;
        case ETHTOOL_SMSGLVL:
                rc = ethtool_set_value_void(dev, useraddr,
                                       dev->ethtool_ops->set_msglevel);
                break;
        case ETHTOOL_GEEE:
                rc = ethtool_get_eee(dev, useraddr);
                break;
        case ETHTOOL_SEEE:
                rc = ethtool_set_eee(dev, useraddr);
                break;
        case ETHTOOL_NWAY_RST:
                rc = ethtool_nway_reset(dev);
                break;
        case ETHTOOL_GLINK:
                rc = ethtool_get_link(dev, useraddr);
                break;
        case ETHTOOL_GEEPROM:
                rc = ethtool_get_eeprom(dev, useraddr);
                break;
        case ETHTOOL_SEEPROM:
                rc = ethtool_set_eeprom(dev, useraddr);
                break;
        case ETHTOOL_GCOALESCE:
                rc = ethtool_get_coalesce(dev, useraddr);
                break;
        case ETHTOOL_SCOALESCE:
                rc = ethtool_set_coalesce(dev, useraddr);
                break;
        case ETHTOOL_GRINGPARAM:
                rc = ethtool_get_ringparam(dev, useraddr);
                break;
        case ETHTOOL_SRINGPARAM:
                rc = ethtool_set_ringparam(dev, useraddr);
                break;
        case ETHTOOL_GPAUSEPARAM:
                rc = ethtool_get_pauseparam(dev, useraddr);
                break;
        case ETHTOOL_SPAUSEPARAM:
                rc = ethtool_set_pauseparam(dev, useraddr);
                break;
        case ETHTOOL_TEST:
                rc = ethtool_self_test(dev, useraddr);
                break;
        case ETHTOOL_GSTRINGS:
                rc = ethtool_get_strings(dev, useraddr);
                break;
        case ETHTOOL_PHYS_ID:
                rc = ethtool_phys_id(dev, useraddr);
                break;
        case ETHTOOL_GSTATS:
                rc = ethtool_get_stats(dev, useraddr);
                break;
        case ETHTOOL_GPERMADDR:
                rc = ethtool_get_perm_addr(dev, useraddr);
                break;
        case ETHTOOL_GFLAGS:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                        __ethtool_get_flags);
                break;
        case ETHTOOL_SFLAGS:
                rc = ethtool_set_value(dev, useraddr, __ethtool_set_flags);
                break;
        case ETHTOOL_GPFLAGS:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_priv_flags);
                break;
        case ETHTOOL_SPFLAGS:
                rc = ethtool_set_value(dev, useraddr,
                                       dev->ethtool_ops->set_priv_flags);
                break;
        case ETHTOOL_GRXFH:
        case ETHTOOL_GRXRINGS:
        case ETHTOOL_GRXCLSRLCNT:
        case ETHTOOL_GRXCLSRULE:
        case ETHTOOL_GRXCLSRLALL:
                rc = ethtool_get_rxnfc(dev, ethcmd, useraddr);
                break;
        case ETHTOOL_SRXFH:
        case ETHTOOL_SRXCLSRLDEL:
        case ETHTOOL_SRXCLSRLINS:
                rc = ethtool_set_rxnfc(dev, ethcmd, useraddr);
                break;
        case ETHTOOL_FLASHDEV:
                rc = ethtool_flash_device(dev, useraddr);
                break;
        case ETHTOOL_RESET:
                rc = ethtool_reset(dev, useraddr);
                break;
        case ETHTOOL_GSSET_INFO:
                rc = ethtool_get_sset_info(dev, useraddr);
                break;
        case ETHTOOL_GRXFHINDIR:
                rc = ethtool_get_rxfh_indir(dev, useraddr);
                break;
        case ETHTOOL_SRXFHINDIR:
                rc = ethtool_set_rxfh_indir(dev, useraddr);
                break;
        case ETHTOOL_GRSSH:
                rc = ethtool_get_rxfh(dev, useraddr);
                break;
        case ETHTOOL_SRSSH:
                rc = ethtool_set_rxfh(dev, useraddr);
                break;
        case ETHTOOL_GFEATURES:
                rc = ethtool_get_features(dev, useraddr);
                break;
        case ETHTOOL_SFEATURES:
                rc = ethtool_set_features(dev, useraddr);
                break;
        case ETHTOOL_GTXCSUM:
        case ETHTOOL_GRXCSUM:
        case ETHTOOL_GSG:
        case ETHTOOL_GTSO:
        case ETHTOOL_GUFO:
        case ETHTOOL_GGSO:
        case ETHTOOL_GGRO:
                rc = ethtool_get_one_feature(dev, useraddr, ethcmd);
                break;
        case ETHTOOL_STXCSUM:
        case ETHTOOL_SRXCSUM:
        case ETHTOOL_SSG:
        case ETHTOOL_STSO:
        case ETHTOOL_SUFO:
        case ETHTOOL_SGSO:
        case ETHTOOL_SGRO:
                rc = ethtool_set_one_feature(dev, useraddr, ethcmd);
                break;
        case ETHTOOL_GCHANNELS:
                rc = ethtool_get_channels(dev, useraddr);
                break;
        case ETHTOOL_SCHANNELS:
                rc = ethtool_set_channels(dev, useraddr);
                break;
        case ETHTOOL_SET_DUMP:
                rc = ethtool_set_dump(dev, useraddr);
                break;
        case ETHTOOL_GET_DUMP_FLAG:
                rc = ethtool_get_dump_flag(dev, useraddr);
                break;
        case ETHTOOL_GET_DUMP_DATA:
                rc = ethtool_get_dump_data(dev, useraddr);
                break;
        case ETHTOOL_GET_TS_INFO:
                rc = ethtool_get_ts_info(dev, useraddr);
                break;
        case ETHTOOL_GMODULEINFO:
                rc = ethtool_get_module_info(dev, useraddr);
                break;
        case ETHTOOL_GMODULEEEPROM:
                rc = ethtool_get_module_eeprom(dev, useraddr);
                break;
        case ETHTOOL_GTUNABLE:
                rc = ethtool_get_tunable(dev, useraddr);
                break;
        case ETHTOOL_STUNABLE:
                rc = ethtool_set_tunable(dev, useraddr);
                break;
        case ETHTOOL_GPHYSTATS:
                rc = ethtool_get_phy_stats(dev, useraddr);
                break;
        case ETHTOOL_PERQUEUE:
                rc = ethtool_set_per_queue(dev, useraddr);
                break;
        case ETHTOOL_GLINKSETTINGS:
                rc = ethtool_get_link_ksettings(dev, useraddr);
                break;
        case ETHTOOL_SLINKSETTINGS:
                rc = ethtool_set_link_ksettings(dev, useraddr);
                break;
        default:
                rc = -EOPNOTSUPP;
        }

        if (dev->ethtool_ops->complete)
                dev->ethtool_ops->complete(dev);

        if (old_features != dev->features)
                netdev_features_change(dev);

        return rc;
}