text: // SPDX-License-Identifier: GPL-2.0-or-later
  /*
   * 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.
   */
  
  #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/sfp.h>
  #include <linux/slab.h>
  #include <linux/rtnetlink.h>
  #include <linux/sched/signal.h>
  #include <linux/net.h>
  #include <net/devlink.h>
  #include <net/xdp_sock.h>
  #include <net/flow_offload.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_GRO_HW_BIT] =           "rx-gro-hw",
  	[NETIF_F_LRO_BIT] =              "rx-lro",
  
  	[NETIF_F_TSO_BIT] =              "tx-tcp-segmentation",
  	[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_GSO_ESP_BIT] =		 "tx-esp-segmentation",
  	[NETIF_F_GSO_UDP_L4_BIT] =	 "tx-udp-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_HW_TC_BIT] =		 "hw-tc-offload",
  	[NETIF_F_HW_ESP_BIT] =		 "esp-hw-offload",
  	[NETIF_F_HW_ESP_TX_CSUM_BIT] =	 "esp-tx-csum-hw-offload",
  	[NETIF_F_RX_UDP_TUNNEL_PORT_BIT] =	 "rx-udp_tunnel-port-offload",
  	[NETIF_F_HW_TLS_RECORD_BIT] =	"tls-hw-record",
  	[NETIF_F_HW_TLS_TX_BIT] =	 "tls-hw-tx-offload",
  	[NETIF_F_HW_TLS_RX_BIT] =	 "tls-hw-rx-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",
  	[ETH_RSS_HASH_CRC32_BIT] =	"crc32",
  };
  
  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",
  	[ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
  };
  
  static const char
  phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
  	[ETHTOOL_ID_UNSPEC]     = "Unspec",
  	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
  	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
  	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
  };
  
  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 __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_TUNABLES)
  		return ARRAY_SIZE(phy_tunable_strings);
  
  	if (sset == ETH_SS_PHY_STATS && dev->phydev &&
  	    !ops->get_ethtool_phy_stats)
  		return phy_ethtool_get_sset_count(dev->phydev);
  
  	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_TUNABLES)
  		memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
  	else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
  		 !ops->get_ethtool_phy_stats)
  		phy_ethtool_get_strings(dev->phydev, data);
  	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_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;
  }
  
  /* Given two link masks, AND them together and save the result in dst. */
  void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
  				  struct ethtool_link_ksettings *src)
  {
  	unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
  	unsigned int idx = 0;
  
  	for (; idx < size; idx++) {
  		dst->link_modes.supported[idx] &=
  			src->link_modes.supported[idx];
  		dst->link_modes.advertising[idx] &=
  			src->link_modes.advertising[idx];
  	}
  }
  EXPORT_SYMBOL(ethtool_intersect_link_masks);
  
  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
   * 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->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;
  	legacy_settings->transceiver
  		= link_ksettings->base.transceiver;
  	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. */
  int __ethtool_get_link_ksettings(struct net_device *dev,
  				 struct ethtool_link_ksettings *link_ksettings)
  {
  	ASSERT_RTNL();
  
  	if (!dev->ethtool_ops->get_link_ksettings)
  		return -EOPNOTSUPP;
  
  	memset(link_ksettings, 0, sizeof(*link_ksettings));
  	return dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
  }
  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_arr32(to->link_modes.supported,
  			  link_usettings.link_modes.supported,
  			  __ETHTOOL_LINK_MODE_MASK_NBITS);
  	bitmap_from_arr32(to->link_modes.advertising,
  			  link_usettings.link_modes.advertising,
  			  __ETHTOOL_LINK_MODE_MASK_NBITS);
  	bitmap_from_arr32(to->link_modes.lp_advertising,
  			  link_usettings.link_modes.lp_advertising,
  			  __ETHTOOL_LINK_MODE_MASK_NBITS);
  
  	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_arr32(link_usettings.link_modes.supported,
  			from->link_modes.supported,
  			__ETHTOOL_LINK_MODE_MASK_NBITS);
  	bitmap_to_arr32(link_usettings.link_modes.advertising,
  			from->link_modes.advertising,
  			__ETHTOOL_LINK_MODE_MASK_NBITS);
  	bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
  			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. */
  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. */
  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);
  }
  
  /* Query device for its ethtool_cmd settings.
   *
   * Backward compatibility note: for compatibility with legacy ethtool, this is
   * now implemented via get_link_ksettings. When driver reports 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). Deprecated fields from
   * ethtool_cmd (transceiver/maxrxpkt/maxtxpkt) are always set to zero.
   */
  static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
  {
  	struct ethtool_link_ksettings link_ksettings;
  	struct ethtool_cmd cmd;
  	int err;
  
  	ASSERT_RTNL();
  	if (!dev->ethtool_ops->get_link_ksettings)
  		return -EOPNOTSUPP;
  
  	memset(&link_ksettings, 0, sizeof(link_ksettings));
  	err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
  	if (err < 0)
  		return err;
  	convert_link_ksettings_to_legacy_settings(&cmd, &link_ksettings);
  
  	/* send a sensible cmd tag back to user */
  	cmd.cmd = ETHTOOL_GSET;
  
  	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 is
   * now always implemented via set_link_settings. When 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_link_ksettings link_ksettings;
  	struct ethtool_cmd cmd;
  
  	ASSERT_RTNL();
  
  	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
  		return -EFAULT;
  	if (!dev->ethtool_ops->set_link_ksettings)
  		return -EOPNOTSUPP;
  
  	if (!convert_legacy_settings_to_link_ksettings(&link_ksettings, &cmd))
  		return -EINVAL;
  	link_ksettings.base.link_mode_masks_nwords =
  		__ETHTOOL_LINK_MODE_MASK_NU32;
  	return dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
  }
  
  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) {
  		int ret = ops->get_regs_len(dev);
  
  		if (ret > 0)
  			info.regdump_len = ret;
  	}
  
  	if (ops->get_eeprom_len)
  		info.eedump_len = ops->get_eeprom_len(dev);
  
  	if (!info.fw_version[0])
  		devlink_compat_running_version(dev, info.fw_version,
  					       sizeof(info.fw_version));
  
  	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 = kcalloc(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 FLOW_RSS was requested then user-space must be using the
  	 * new definition, as FLOW_RSS is newer.
  	 */
  	if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
  		info_size = sizeof(info);
  		if (copy_from_user(&info, useraddr, info_size))
  			return -EFAULT;
  		/* Since malicious users may modify the original data,
  		 * we need to check whether FLOW_RSS is still requested.
  		 */
  		if (!(info.flow_type & FLOW_RSS))
  			return -EINVAL;
  	}
  
  	if (info.cmd != cmd)
  		return -EINVAL;
  
  	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
  		if (info.rule_cnt > 0) {
  			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
  				rule_buf = kcalloc(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.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
  		return -EINVAL;
  	/* Most drivers don't handle rss_context, check it's 0 as well */
  	if (rxfh.rss_context && !ops->get_rxfh_context)
  		return -EOPNOTSUPP;
  
  	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;
  
  	if (rxfh.rss_context)
  		ret = dev->ethtool_ops->get_rxfh_context(dev, indir, hkey,
  							 &dev_hfunc,
  							 rxfh.rss_context);
  	else
  		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]);
  	bool delete = false;
  
  	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.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
  		return -EINVAL;
  	/* Most drivers don't handle rss_context, check it's 0 as well */
  	if (rxfh.rss_context && !ops->set_rxfh_context)
  		return -EOPNOTSUPP;
  
  	/* 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 (master
  	 * context) or delete the context (other RSS contexts).
  	 * 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) {
  		if (rxfh.rss_context == 0) {
  			indir = (u32 *)rss_config;
  			for (i = 0; i < dev_indir_size; i++)
  				indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
  		} else {
  			delete = true;
  		}
  	}
  
  	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;
  		}
  	}
  
  	if (rxfh.rss_context)
  		ret = ops->set_rxfh_context(dev, indir, hkey, rxfh.hfunc,
  					    &rxfh.rss_context, delete);
  	else
  		ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
  	if (ret)
  		goto out;
  
  	if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, rss_context),
  			 &rxfh.rss_context, sizeof(rxfh.rss_context)))
  		ret = -EFAULT;
  
  	if (!rxfh.rss_context) {
  		/* 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 (reglen <= 0)
  		return reglen;
  
  	if (regs.len > reglen)
  		regs.len = reglen;
  
  	regbuf = vzalloc(reglen);
  	if (!regbuf)
  		return -ENOMEM;
  
  	if (regs.len < reglen)
  		reglen = regs.len;
  
  	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 (copy_to_user(useraddr, regbuf, reglen))
  		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;
  
  	if (!dev->ethtool_ops->get_wol)
  		return -EOPNOTSUPP;
  
  	memset(&wol, 0, sizeof(struct ethtool_wolinfo));
  	wol.cmd = ETHTOOL_GWOL;
  	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;
  	int ret;
  
  	if (!dev->ethtool_ops->set_wol)
  		return -EOPNOTSUPP;
  
  	if (copy_from_user(&wol, useraddr, sizeof(wol)))
  		return -EFAULT;
  
  	ret = dev->ethtool_ops->set_wol(dev, &wol);
  	if (ret)
  		return ret;
  
  	dev->wol_enabled = !!wol.wolopts;
  
  	return 0;
  }
  
  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, max = { .cmd = ETHTOOL_GRINGPARAM };
  
  	if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
  		return -EOPNOTSUPP;
  
  	if (copy_from_user(&ringparam, useraddr, sizeof(ringparam)))
  		return -EFAULT;
  
  	dev->ethtool_ops->get_ringparam(dev, &max);
  
  	/* ensure new ring parameters are within the maximums */
  	if (ringparam.rx_pending > max.rx_max_pending ||
  	    ringparam.rx_mini_pending > max.rx_mini_max_pending ||
  	    ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
  	    ringparam.tx_pending > max.tx_max_pending)
  		return -EINVAL;
  
  	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, curr = { .cmd = ETHTOOL_GCHANNELS };
  	u16 from_channel, to_channel;
  	u32 max_rx_in_use = 0;
  	unsigned int i;
  
  	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, &curr);
  
  	/* ensure new counts are within the maximums */
  	if (channels.rx_count > curr.max_rx ||
  	    channels.tx_count > curr.max_tx ||
  	    channels.combined_count > curr.max_combined ||
  	    channels.other_count > curr.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;
  
  	/* Disabling channels, query zero-copy AF_XDP sockets */
  	from_channel = channels.combined_count +
  		min(channels.rx_count, channels.tx_count);
  	to_channel = curr.combined_count + max(curr.rx_count, curr.tx_count);
  	for (i = from_channel; i < to_channel; i++)
  		if (xdp_get_umem_from_qid(dev, i))
  			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 = { .cmd = 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_array(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;
  	if (ret > S32_MAX / ETH_GSTRING_LEN)
  		return -ENOMEM;
  	WARN_ON_ONCE(!ret);
  
  	gstrings.len = ret;
  
  	if (gstrings.len) {
  		data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));
  		if (!data)
  			return -ENOMEM;
  
  		__ethtool_get_strings(dev, gstrings.string_set, data);
  	} else {
  		data = NULL;
  	}
  
  	ret = -EFAULT;
  	if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
  		goto out;
  	useraddr += sizeof(gstrings);
  	if (gstrings.len &&
  	    copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
  		goto out;
  	ret = 0;
  
  out:
  	vfree(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;
  	if (n_stats > S32_MAX / sizeof(u64))
  		return -ENOMEM;
  	WARN_ON_ONCE(!n_stats);
  	if (copy_from_user(&stats, useraddr, sizeof(stats)))
  		return -EFAULT;
  
  	stats.n_stats = n_stats;
  
  	if (n_stats) {
  		data = vzalloc(array_size(n_stats, sizeof(u64)));
  		if (!data)
  			return -ENOMEM;
  		ops->get_ethtool_stats(dev, &stats, data);
  	} else {
  		data = NULL;
  	}
  
  	ret = -EFAULT;
  	if (copy_to_user(useraddr, &stats, sizeof(stats)))
  		goto out;
  	useraddr += sizeof(stats);
  	if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
  		goto out;
  	ret = 0;
  
   out:
  	vfree(data);
  	return ret;
  }
  
  static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
  {
  	const struct ethtool_ops *ops = dev->ethtool_ops;
  	struct phy_device *phydev = dev->phydev;
  	struct ethtool_stats stats;
  	u64 *data;
  	int ret, n_stats;
  
  	if (!phydev && (!ops->get_ethtool_phy_stats || !ops->get_sset_count))
  		return -EOPNOTSUPP;
  
  	if (dev->phydev && !ops->get_ethtool_phy_stats)
  		n_stats = phy_ethtool_get_sset_count(dev->phydev);
  	else
  		n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
  	if (n_stats < 0)
  		return n_stats;
  	if (n_stats > S32_MAX / sizeof(u64))
  		return -ENOMEM;
  	WARN_ON_ONCE(!n_stats);
  
  	if (copy_from_user(&stats, useraddr, sizeof(stats)))
  		return -EFAULT;
  
  	stats.n_stats = n_stats;
  
  	if (n_stats) {
  		data = vzalloc(array_size(n_stats, sizeof(u64)));
  		if (!data)
  			return -ENOMEM;
  
  		if (dev->phydev && !ops->get_ethtool_phy_stats) {
  			ret = phy_ethtool_get_stats(dev->phydev, &stats, data);
  			if (ret < 0)
  				goto out;
  		} else {
  			ops->get_ethtool_phy_stats(dev, &stats, data);
  		}
  	} else {
  		data = NULL;
  	}
  
  	ret = -EFAULT;
  	if (copy_to_user(useraddr, &stats, sizeof(stats)))
  		goto out;
  	useraddr += sizeof(stats);
  	if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
  		goto out;
  	ret = 0;
  
   out:
  	vfree(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;
  	efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
  
  	if (!dev->ethtool_ops->flash_device)
  		return devlink_compat_flash_update(dev, efl.data);
  
  	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 (dev->sfp_bus)
  		return sfp_get_module_info(dev->sfp_bus, modinfo);
  
  	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 (dev->sfp_bus)
  		return sfp_get_module_eeprom(dev->sfp_bus, ee, data);
  
  	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;
  	case ETHTOOL_PFC_PREVENTION_TOUT:
  		if (tuna->len != sizeof(u16) ||
  		    tuna->type_id != ETHTOOL_TUNABLE_U16)
  			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;
  	useraddr += sizeof(tuna);
  	data = memdup_user(useraddr, tuna.len);
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  	ret = ops->set_tunable(dev, &tuna, data);
  
  	kfree(data);
  	return ret;
  }
  
  static noinline_for_stack 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_arr32(queue_mask, per_queue_opt->queue_mask,
  			  MAX_NUM_QUEUE);
  
  	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 noinline_for_stack 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_arr32(queue_mask, per_queue_opt->queue_mask, MAX_NUM_QUEUE);
  	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 noinline_for_stack ethtool_set_per_queue(struct net_device *dev,
  				 void __user *useraddr, u32 sub_cmd)
  {
  	struct ethtool_per_queue_op per_queue_opt;
  
  	if (copy_from_user(&per_queue_opt, useraddr, sizeof(per_queue_opt)))
  		return -EFAULT;
  
  	if (per_queue_opt.sub_command != sub_cmd)
  		return -EINVAL;
  
  	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;
  	};
  }
  
  static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
  {
  	switch (tuna->id) {
  	case ETHTOOL_PHY_DOWNSHIFT:
  	case ETHTOOL_PHY_FAST_LINK_DOWN:
  		if (tuna->len != sizeof(u8) ||
  		    tuna->type_id != ETHTOOL_TUNABLE_U8)
  			return -EINVAL;
  		break;
  	case ETHTOOL_PHY_EDPD:
  		if (tuna->len != sizeof(u16) ||
  		    tuna->type_id != ETHTOOL_TUNABLE_U16)
  			return -EINVAL;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
  {
  	int ret;
  	struct ethtool_tunable tuna;
  	struct phy_device *phydev = dev->phydev;
  	void *data;
  
  	if (!(phydev && phydev->drv && phydev->drv->get_tunable))
  		return -EOPNOTSUPP;
  
  	if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
  		return -EFAULT;
  	ret = ethtool_phy_tunable_valid(&tuna);
  	if (ret)
  		return ret;
  	data = kmalloc(tuna.len, GFP_USER);
  	if (!data)
  		return -ENOMEM;
  	mutex_lock(&phydev->lock);
  	ret = phydev->drv->get_tunable(phydev, &tuna, data);
  	mutex_unlock(&phydev->lock);
  	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 set_phy_tunable(struct net_device *dev, void __user *useraddr)
  {
  	int ret;
  	struct ethtool_tunable tuna;
  	struct phy_device *phydev = dev->phydev;
  	void *data;
  
  	if (!(phydev && phydev->drv && phydev->drv->set_tunable))
  		return -EOPNOTSUPP;
  	if (copy_from_user(&tuna, useraddr, sizeof(tuna)))
  		return -EFAULT;
  	ret = ethtool_phy_tunable_valid(&tuna);
  	if (ret)
  		return ret;
  	useraddr += sizeof(tuna);
  	data = memdup_user(useraddr, tuna.len);
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  	mutex_lock(&phydev->lock);
  	ret = phydev->drv->set_tunable(phydev, &tuna, data);
  	mutex_unlock(&phydev->lock);
  
  	kfree(data);
  	return ret;
  }
  
  static int ethtool_get_fecparam(struct net_device *dev, void __user *useraddr)
  {
  	struct ethtool_fecparam fecparam = { .cmd = ETHTOOL_GFECPARAM };
  	int rc;
  
  	if (!dev->ethtool_ops->get_fecparam)
  		return -EOPNOTSUPP;
  
  	rc = dev->ethtool_ops->get_fecparam(dev, &fecparam);
  	if (rc)
  		return rc;
  
  	if (copy_to_user(useraddr, &fecparam, sizeof(fecparam)))
  		return -EFAULT;
  	return 0;
  }
  
  static int ethtool_set_fecparam(struct net_device *dev, void __user *useraddr)
  {
  	struct ethtool_fecparam fecparam;
  
  	if (!dev->ethtool_ops->set_fecparam)
  		return -EOPNOTSUPP;
  
  	if (copy_from_user(&fecparam, useraddr, sizeof(fecparam)))
  		return -EFAULT;
  
  	return dev->ethtool_ops->set_fecparam(dev, &fecparam);
  }
  
  /* 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_PHY_GTUNABLE:
  	case ETHTOOL_GLINKSETTINGS:
  	case ETHTOOL_GFECPARAM:
  		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_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_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, sub_cmd);
  		break;
  	case ETHTOOL_GLINKSETTINGS:
  		rc = ethtool_get_link_ksettings(dev, useraddr);
  		break;
  	case ETHTOOL_SLINKSETTINGS:
  		rc = ethtool_set_link_ksettings(dev, useraddr);
  		break;
  	case ETHTOOL_PHY_GTUNABLE:
  		rc = get_phy_tunable(dev, useraddr);
  		break;
  	case ETHTOOL_PHY_STUNABLE:
  		rc = set_phy_tunable(dev, useraddr);
  		break;
  	case ETHTOOL_GFECPARAM:
  		rc = ethtool_get_fecparam(dev, useraddr);
  		break;
  	case ETHTOOL_SFECPARAM:
  		rc = ethtool_set_fecparam(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;
  }
  
  struct ethtool_rx_flow_key {
  	struct flow_dissector_key_basic			basic;
  	union {
  		struct flow_dissector_key_ipv4_addrs	ipv4;
  		struct flow_dissector_key_ipv6_addrs	ipv6;
  	};
  	struct flow_dissector_key_ports			tp;
  	struct flow_dissector_key_ip			ip;
  	struct flow_dissector_key_vlan			vlan;
  	struct flow_dissector_key_eth_addrs		eth_addrs;
  } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
  
  struct ethtool_rx_flow_match {
  	struct flow_dissector		dissector;
  	struct ethtool_rx_flow_key	key;
  	struct ethtool_rx_flow_key	mask;
  };
  
  struct ethtool_rx_flow_rule *
  ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
  {
  	const struct ethtool_rx_flow_spec *fs = input->fs;
  	static struct in6_addr zero_addr = {};
  	struct ethtool_rx_flow_match *match;
  	struct ethtool_rx_flow_rule *flow;
  	struct flow_action_entry *act;
  
  	flow = kzalloc(sizeof(struct ethtool_rx_flow_rule) +
  		       sizeof(struct ethtool_rx_flow_match), GFP_KERNEL);
  	if (!flow)
  		return ERR_PTR(-ENOMEM);
  
  	/* ethtool_rx supports only one single action per rule. */
  	flow->rule = flow_rule_alloc(1);
  	if (!flow->rule) {
  		kfree(flow);
  		return ERR_PTR(-ENOMEM);
  	}
  
  	match = (struct ethtool_rx_flow_match *)flow->priv;
  	flow->rule->match.dissector	= &match->dissector;
  	flow->rule->match.mask		= &match->mask;
  	flow->rule->match.key		= &match->key;
  
  	match->mask.basic.n_proto = htons(0xffff);
  
  	switch (fs->flow_type & ~(FLOW_EXT | FLOW_MAC_EXT | FLOW_RSS)) {
  	case ETHER_FLOW: {
  		const struct ethhdr *ether_spec, *ether_m_spec;
  
  		ether_spec = &fs->h_u.ether_spec;
  		ether_m_spec = &fs->m_u.ether_spec;
  
  		if (!is_zero_ether_addr(ether_m_spec->h_source)) {
  			ether_addr_copy(match->key.eth_addrs.src,
  					ether_spec->h_source);
  			ether_addr_copy(match->mask.eth_addrs.src,
  					ether_m_spec->h_source);
  		}
  		if (!is_zero_ether_addr(ether_m_spec->h_dest)) {
  			ether_addr_copy(match->key.eth_addrs.dst,
  					ether_spec->h_dest);
  			ether_addr_copy(match->mask.eth_addrs.dst,
  					ether_m_spec->h_dest);
  		}
  		if (ether_m_spec->h_proto) {
  			match->key.basic.n_proto = ether_spec->h_proto;
  			match->mask.basic.n_proto = ether_m_spec->h_proto;
  		}
  		}
  		break;
  	case TCP_V4_FLOW:
  	case UDP_V4_FLOW: {
  		const struct ethtool_tcpip4_spec *v4_spec, *v4_m_spec;
  
  		match->key.basic.n_proto = htons(ETH_P_IP);
  
  		v4_spec = &fs->h_u.tcp_ip4_spec;
  		v4_m_spec = &fs->m_u.tcp_ip4_spec;
  
  		if (v4_m_spec->ip4src) {
  			match->key.ipv4.src = v4_spec->ip4src;
  			match->mask.ipv4.src = v4_m_spec->ip4src;
  		}
  		if (v4_m_spec->ip4dst) {
  			match->key.ipv4.dst = v4_spec->ip4dst;
  			match->mask.ipv4.dst = v4_m_spec->ip4dst;
  		}
  		if (v4_m_spec->ip4src ||
  		    v4_m_spec->ip4dst) {
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_IPV4_ADDRS] =
  				offsetof(struct ethtool_rx_flow_key, ipv4);
  		}
  		if (v4_m_spec->psrc) {
  			match->key.tp.src = v4_spec->psrc;
  			match->mask.tp.src = v4_m_spec->psrc;
  		}
  		if (v4_m_spec->pdst) {
  			match->key.tp.dst = v4_spec->pdst;
  			match->mask.tp.dst = v4_m_spec->pdst;
  		}
  		if (v4_m_spec->psrc ||
  		    v4_m_spec->pdst) {
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_PORTS);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_PORTS] =
  				offsetof(struct ethtool_rx_flow_key, tp);
  		}
  		if (v4_m_spec->tos) {
  			match->key.ip.tos = v4_spec->tos;
  			match->mask.ip.tos = v4_m_spec->tos;
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_IP);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_IP] =
  				offsetof(struct ethtool_rx_flow_key, ip);
  		}
  		}
  		break;
  	case TCP_V6_FLOW:
  	case UDP_V6_FLOW: {
  		const struct ethtool_tcpip6_spec *v6_spec, *v6_m_spec;
  
  		match->key.basic.n_proto = htons(ETH_P_IPV6);
  
  		v6_spec = &fs->h_u.tcp_ip6_spec;
  		v6_m_spec = &fs->m_u.tcp_ip6_spec;
  		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr))) {
  			memcpy(&match->key.ipv6.src, v6_spec->ip6src,
  			       sizeof(match->key.ipv6.src));
  			memcpy(&match->mask.ipv6.src, v6_m_spec->ip6src,
  			       sizeof(match->mask.ipv6.src));
  		}
  		if (memcmp(v6_m_spec->ip6dst, &zero_addr, sizeof(zero_addr))) {
  			memcpy(&match->key.ipv6.dst, v6_spec->ip6dst,
  			       sizeof(match->key.ipv6.dst));
  			memcpy(&match->mask.ipv6.dst, v6_m_spec->ip6dst,
  			       sizeof(match->mask.ipv6.dst));
  		}
  		if (memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr)) ||
  		    memcmp(v6_m_spec->ip6src, &zero_addr, sizeof(zero_addr))) {
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_IPV6_ADDRS] =
  				offsetof(struct ethtool_rx_flow_key, ipv6);
  		}
  		if (v6_m_spec->psrc) {
  			match->key.tp.src = v6_spec->psrc;
  			match->mask.tp.src = v6_m_spec->psrc;
  		}
  		if (v6_m_spec->pdst) {
  			match->key.tp.dst = v6_spec->pdst;
  			match->mask.tp.dst = v6_m_spec->pdst;
  		}
  		if (v6_m_spec->psrc ||
  		    v6_m_spec->pdst) {
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_PORTS);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_PORTS] =
  				offsetof(struct ethtool_rx_flow_key, tp);
  		}
  		if (v6_m_spec->tclass) {
  			match->key.ip.tos = v6_spec->tclass;
  			match->mask.ip.tos = v6_m_spec->tclass;
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_IP);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_IP] =
  				offsetof(struct ethtool_rx_flow_key, ip);
  		}
  		}
  		break;
  	default:
  		ethtool_rx_flow_rule_destroy(flow);
  		return ERR_PTR(-EINVAL);
  	}
  
  	switch (fs->flow_type & ~(FLOW_EXT | FLOW_MAC_EXT | FLOW_RSS)) {
  	case TCP_V4_FLOW:
  	case TCP_V6_FLOW:
  		match->key.basic.ip_proto = IPPROTO_TCP;
  		break;
  	case UDP_V4_FLOW:
  	case UDP_V6_FLOW:
  		match->key.basic.ip_proto = IPPROTO_UDP;
  		break;
  	}
  	match->mask.basic.ip_proto = 0xff;
  
  	match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_BASIC);
  	match->dissector.offset[FLOW_DISSECTOR_KEY_BASIC] =
  		offsetof(struct ethtool_rx_flow_key, basic);
  
  	if (fs->flow_type & FLOW_EXT) {
  		const struct ethtool_flow_ext *ext_h_spec = &fs->h_ext;
  		const struct ethtool_flow_ext *ext_m_spec = &fs->m_ext;
  
  		if (ext_m_spec->vlan_etype) {
  			match->key.vlan.vlan_tpid = ext_h_spec->vlan_etype;
  			match->mask.vlan.vlan_tpid = ext_m_spec->vlan_etype;
  		}
  
  		if (ext_m_spec->vlan_tci) {
  			match->key.vlan.vlan_id =
  				ntohs(ext_h_spec->vlan_tci) & 0x0fff;
  			match->mask.vlan.vlan_id =
  				ntohs(ext_m_spec->vlan_tci) & 0x0fff;
  
  			match->key.vlan.vlan_dei =
  				!!(ext_h_spec->vlan_tci & htons(0x1000));
  			match->mask.vlan.vlan_dei =
  				!!(ext_m_spec->vlan_tci & htons(0x1000));
  
  			match->key.vlan.vlan_priority =
  				(ntohs(ext_h_spec->vlan_tci) & 0xe000) >> 13;
  			match->mask.vlan.vlan_priority =
  				(ntohs(ext_m_spec->vlan_tci) & 0xe000) >> 13;
  		}
  
  		if (ext_m_spec->vlan_etype ||
  		    ext_m_spec->vlan_tci) {
  			match->dissector.used_keys |=
  				BIT(FLOW_DISSECTOR_KEY_VLAN);
  			match->dissector.offset[FLOW_DISSECTOR_KEY_VLAN] =
  				offsetof(struct ethtool_rx_flow_key, vlan);
  		}
  	}
  	if (fs->flow_type & FLOW_MAC_EXT) {
  		const struct ethtool_flow_ext *ext_h_spec = &fs->h_ext;
  		const struct ethtool_flow_ext *ext_m_spec = &fs->m_ext;
  
  		memcpy(match->key.eth_addrs.dst, ext_h_spec->h_dest,
  		       ETH_ALEN);
  		memcpy(match->mask.eth_addrs.dst, ext_m_spec->h_dest,
  		       ETH_ALEN);
  
  		match->dissector.used_keys |=
  			BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS);
  		match->dissector.offset[FLOW_DISSECTOR_KEY_ETH_ADDRS] =
  			offsetof(struct ethtool_rx_flow_key, eth_addrs);
  	}
  
  	act = &flow->rule->action.entries[0];
  	switch (fs->ring_cookie) {
  	case RX_CLS_FLOW_DISC:
  		act->id = FLOW_ACTION_DROP;
  		break;
  	case RX_CLS_FLOW_WAKE:
  		act->id = FLOW_ACTION_WAKE;
  		break;
  	default:
  		act->id = FLOW_ACTION_QUEUE;
  		if (fs->flow_type & FLOW_RSS)
  			act->queue.ctx = input->rss_ctx;
  
  		act->queue.vf = ethtool_get_flow_spec_ring_vf(fs->ring_cookie);
  		act->queue.index = ethtool_get_flow_spec_ring(fs->ring_cookie);
  		break;
  	}
  
  	return flow;
  }
  EXPORT_SYMBOL(ethtool_rx_flow_rule_create);
  
  void ethtool_rx_flow_rule_destroy(struct ethtool_rx_flow_rule *flow)
  {
  	kfree(flow->rule);
  	kfree(flow);
  }
  EXPORT_SYMBOL(ethtool_rx_flow_rule_destroy);
  