/*
   * net-sysfs.c - network device class and attributes
   *
   * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>

   *

   *	This program is free software; you can redistribute it and/or
   *	modify it under the terms of the GNU General Public License
   *	as published by the Free Software Foundation; either version
   *	2 of the License, or (at your option) any later version.
   */

  #include <linux/capability.h>

  #include <linux/kernel.h>
  #include <linux/netdevice.h>
  #include <linux/if_arp.h>

  #include <linux/slab.h>

  #include <linux/nsproxy.h>

  #include <net/sock.h>

  #include <net/net_namespace.h>

  #include <linux/rtnetlink.h>
  #include <linux/wireless.h>

  #include <linux/vmalloc.h>

  #include <linux/export.h>

  #include <linux/jiffies.h>

  #include <net/wext.h>

  #include "net-sysfs.h"

  #ifdef CONFIG_SYSFS

  static const char fmt_hex[] = "%#x
  ";

  static const char fmt_long_hex[] = "%#lx
  ";

  static const char fmt_dec[] = "%d
  ";

  static const char fmt_udec[] = "%u
  ";

  static const char fmt_ulong[] = "%lu
  ";

  static const char fmt_u64[] = "%llu
  ";

  static inline int dev_isalive(const struct net_device *dev)

  {

  	return dev->reg_state <= NETREG_REGISTERED;

  }
  
  /* use same locking rules as GIF* ioctl's */

  static ssize_t netdev_show(const struct device *dev,
  			   struct device_attribute *attr, char *buf,

  			   ssize_t (*format)(const struct net_device *, char *))
  {

  	struct net_device *net = to_net_dev(dev);

  	ssize_t ret = -EINVAL;
  
  	read_lock(&dev_base_lock);
  	if (dev_isalive(net))
  		ret = (*format)(net, buf);
  	read_unlock(&dev_base_lock);
  
  	return ret;
  }
  
  /* generate a show function for simple field */
  #define NETDEVICE_SHOW(field, format_string)				\
  static ssize_t format_##field(const struct net_device *net, char *buf)	\
  {									\
  	return sprintf(buf, format_string, net->field);			\
  }									\

  static ssize_t show_##field(struct device *dev,				\
  			    struct device_attribute *attr, char *buf)	\

  {									\

  	return netdev_show(dev, attr, buf, format_##field);		\

  }
  
  
  /* use same locking and permission rules as SIF* ioctl's */

  static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,

  			    const char *buf, size_t len,
  			    int (*set)(struct net_device *, unsigned long))
  {
  	struct net_device *net = to_net_dev(dev);
  	char *endp;
  	unsigned long new;
  	int ret = -EINVAL;
  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	new = simple_strtoul(buf, &endp, 0);
  	if (endp == buf)
  		goto err;

  	if (!rtnl_trylock())

  		return restart_syscall();

  	if (dev_isalive(net)) {
  		if ((ret = (*set)(net, new)) == 0)
  			ret = len;
  	}
  	rtnl_unlock();
   err:
  	return ret;
  }

  NETDEVICE_SHOW(dev_id, fmt_hex);

  NETDEVICE_SHOW(addr_assign_type, fmt_dec);

  NETDEVICE_SHOW(addr_len, fmt_dec);
  NETDEVICE_SHOW(iflink, fmt_dec);
  NETDEVICE_SHOW(ifindex, fmt_dec);

  NETDEVICE_SHOW(type, fmt_dec);

  NETDEVICE_SHOW(link_mode, fmt_dec);

  
  /* use same locking rules as GIFHWADDR ioctl's */

  static ssize_t show_address(struct device *dev, struct device_attribute *attr,
  			    char *buf)

  {
  	struct net_device *net = to_net_dev(dev);
  	ssize_t ret = -EINVAL;
  
  	read_lock(&dev_base_lock);
  	if (dev_isalive(net))

  		ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);

  	read_unlock(&dev_base_lock);
  	return ret;
  }

  static ssize_t show_broadcast(struct device *dev,
  			    struct device_attribute *attr, char *buf)

  {
  	struct net_device *net = to_net_dev(dev);
  	if (dev_isalive(net))

  		return sysfs_format_mac(buf, net->broadcast, net->addr_len);

  	return -EINVAL;
  }

  static ssize_t show_carrier(struct device *dev,
  			    struct device_attribute *attr, char *buf)

  {
  	struct net_device *netdev = to_net_dev(dev);
  	if (netif_running(netdev)) {
  		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
  	}
  	return -EINVAL;
  }

  static ssize_t show_speed(struct device *dev,
  			  struct device_attribute *attr, char *buf)
  {
  	struct net_device *netdev = to_net_dev(dev);
  	int ret = -EINVAL;
  
  	if (!rtnl_trylock())
  		return restart_syscall();

  	if (netif_running(netdev)) {
  		struct ethtool_cmd cmd;

  		if (!__ethtool_get_settings(netdev, &cmd))

  			ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));

  	}
  	rtnl_unlock();
  	return ret;
  }
  
  static ssize_t show_duplex(struct device *dev,
  			   struct device_attribute *attr, char *buf)
  {
  	struct net_device *netdev = to_net_dev(dev);
  	int ret = -EINVAL;
  
  	if (!rtnl_trylock())
  		return restart_syscall();

  	if (netif_running(netdev)) {
  		struct ethtool_cmd cmd;

  		if (!__ethtool_get_settings(netdev, &cmd))

  			ret = sprintf(buf, "%s
  ",
  				      cmd.duplex ? "full" : "half");

  	}
  	rtnl_unlock();
  	return ret;
  }

  static ssize_t show_dormant(struct device *dev,
  			    struct device_attribute *attr, char *buf)

  {
  	struct net_device *netdev = to_net_dev(dev);
  
  	if (netif_running(netdev))
  		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
  
  	return -EINVAL;
  }

  static const char *const operstates[] = {

  	"unknown",
  	"notpresent", /* currently unused */
  	"down",
  	"lowerlayerdown",
  	"testing", /* currently unused */
  	"dormant",
  	"up"
  };

  static ssize_t show_operstate(struct device *dev,
  			      struct device_attribute *attr, char *buf)

  {
  	const struct net_device *netdev = to_net_dev(dev);
  	unsigned char operstate;
  
  	read_lock(&dev_base_lock);
  	operstate = netdev->operstate;
  	if (!netif_running(netdev))
  		operstate = IF_OPER_DOWN;
  	read_unlock(&dev_base_lock);

  	if (operstate >= ARRAY_SIZE(operstates))

  		return -EINVAL; /* should not happen */
  
  	return sprintf(buf, "%s
  ", operstates[operstate]);
  }

  /* read-write attributes */
  NETDEVICE_SHOW(mtu, fmt_dec);
  
  static int change_mtu(struct net_device *net, unsigned long new_mtu)
  {
  	return dev_set_mtu(net, (int) new_mtu);
  }

  static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
  			 const char *buf, size_t len)

  {

  	return netdev_store(dev, attr, buf, len, change_mtu);

  }

  NETDEVICE_SHOW(flags, fmt_hex);
  
  static int change_flags(struct net_device *net, unsigned long new_flags)
  {
  	return dev_change_flags(net, (unsigned) new_flags);
  }

  static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
  			   const char *buf, size_t len)

  {

  	return netdev_store(dev, attr, buf, len, change_flags);

  }

  NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
  
  static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
  {
  	net->tx_queue_len = new_len;
  	return 0;
  }

  static ssize_t store_tx_queue_len(struct device *dev,
  				  struct device_attribute *attr,
  				  const char *buf, size_t len)

  {

  	return netdev_store(dev, attr, buf, len, change_tx_queue_len);

  }

  static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
  			     const char *buf, size_t len)
  {
  	struct net_device *netdev = to_net_dev(dev);
  	size_t count = len;
  	ssize_t ret;
  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	/* ignore trailing newline */
  	if (len >  0 && buf[len - 1] == '
  ')
  		--count;

  	if (!rtnl_trylock())
  		return restart_syscall();

  	ret = dev_set_alias(netdev, buf, count);
  	rtnl_unlock();
  
  	return ret < 0 ? ret : len;
  }
  
  static ssize_t show_ifalias(struct device *dev,
  			    struct device_attribute *attr, char *buf)
  {
  	const struct net_device *netdev = to_net_dev(dev);
  	ssize_t ret = 0;

  	if (!rtnl_trylock())
  		return restart_syscall();

  	if (netdev->ifalias)
  		ret = sprintf(buf, "%s
  ", netdev->ifalias);
  	rtnl_unlock();
  	return ret;
  }

  NETDEVICE_SHOW(group, fmt_dec);
  
  static int change_group(struct net_device *net, unsigned long new_group)
  {
  	dev_set_group(net, (int) new_group);
  	return 0;
  }
  
  static ssize_t store_group(struct device *dev, struct device_attribute *attr,
  			 const char *buf, size_t len)
  {
  	return netdev_store(dev, attr, buf, len, change_group);
  }

  static struct device_attribute net_class_attributes[] = {

  	__ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),

  	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),

  	__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),

  	__ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),

  	__ATTR(iflink, S_IRUGO, show_iflink, NULL),
  	__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),

  	__ATTR(type, S_IRUGO, show_type, NULL),

  	__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),

  	__ATTR(address, S_IRUGO, show_address, NULL),
  	__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
  	__ATTR(carrier, S_IRUGO, show_carrier, NULL),

  	__ATTR(speed, S_IRUGO, show_speed, NULL),
  	__ATTR(duplex, S_IRUGO, show_duplex, NULL),

  	__ATTR(dormant, S_IRUGO, show_dormant, NULL),
  	__ATTR(operstate, S_IRUGO, show_operstate, NULL),

  	__ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
  	__ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
  	__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
  	       store_tx_queue_len),

  	__ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),

  	{}

  };
  
  /* Show a given an attribute in the statistics group */

  static ssize_t netstat_show(const struct device *d,
  			    struct device_attribute *attr, char *buf,

  			    unsigned long offset)
  {

  	struct net_device *dev = to_net_dev(d);

  	ssize_t ret = -EINVAL;

  	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
  			offset % sizeof(u64) != 0);

  
  	read_lock(&dev_base_lock);

  	if (dev_isalive(dev)) {

  		struct rtnl_link_stats64 temp;
  		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);

  		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));

  	}

  	read_unlock(&dev_base_lock);
  	return ret;
  }
  
  /* generate a read-only statistics attribute */
  #define NETSTAT_ENTRY(name)						\

  static ssize_t show_##name(struct device *d,				\
  			   struct device_attribute *attr, char *buf) 	\

  {									\

  	return netstat_show(d, attr, buf,				\

  			    offsetof(struct rtnl_link_stats64, name));	\

  }									\

  static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)

  
  NETSTAT_ENTRY(rx_packets);
  NETSTAT_ENTRY(tx_packets);
  NETSTAT_ENTRY(rx_bytes);
  NETSTAT_ENTRY(tx_bytes);
  NETSTAT_ENTRY(rx_errors);
  NETSTAT_ENTRY(tx_errors);
  NETSTAT_ENTRY(rx_dropped);
  NETSTAT_ENTRY(tx_dropped);
  NETSTAT_ENTRY(multicast);
  NETSTAT_ENTRY(collisions);
  NETSTAT_ENTRY(rx_length_errors);
  NETSTAT_ENTRY(rx_over_errors);
  NETSTAT_ENTRY(rx_crc_errors);
  NETSTAT_ENTRY(rx_frame_errors);
  NETSTAT_ENTRY(rx_fifo_errors);
  NETSTAT_ENTRY(rx_missed_errors);
  NETSTAT_ENTRY(tx_aborted_errors);
  NETSTAT_ENTRY(tx_carrier_errors);
  NETSTAT_ENTRY(tx_fifo_errors);
  NETSTAT_ENTRY(tx_heartbeat_errors);
  NETSTAT_ENTRY(tx_window_errors);
  NETSTAT_ENTRY(rx_compressed);
  NETSTAT_ENTRY(tx_compressed);
  
  static struct attribute *netstat_attrs[] = {

  	&dev_attr_rx_packets.attr,
  	&dev_attr_tx_packets.attr,
  	&dev_attr_rx_bytes.attr,
  	&dev_attr_tx_bytes.attr,
  	&dev_attr_rx_errors.attr,
  	&dev_attr_tx_errors.attr,
  	&dev_attr_rx_dropped.attr,
  	&dev_attr_tx_dropped.attr,
  	&dev_attr_multicast.attr,
  	&dev_attr_collisions.attr,
  	&dev_attr_rx_length_errors.attr,
  	&dev_attr_rx_over_errors.attr,
  	&dev_attr_rx_crc_errors.attr,
  	&dev_attr_rx_frame_errors.attr,
  	&dev_attr_rx_fifo_errors.attr,
  	&dev_attr_rx_missed_errors.attr,
  	&dev_attr_tx_aborted_errors.attr,
  	&dev_attr_tx_carrier_errors.attr,
  	&dev_attr_tx_fifo_errors.attr,
  	&dev_attr_tx_heartbeat_errors.attr,
  	&dev_attr_tx_window_errors.attr,
  	&dev_attr_rx_compressed.attr,
  	&dev_attr_tx_compressed.attr,

  	NULL
  };
  
  
  static struct attribute_group netstat_group = {
  	.name  = "statistics",
  	.attrs  = netstat_attrs,
  };

  #ifdef CONFIG_WIRELESS_EXT_SYSFS

  /* helper function that does all the locking etc for wireless stats */

  static ssize_t wireless_show(struct device *d, char *buf,

  			     ssize_t (*format)(const struct iw_statistics *,
  					       char *))
  {

  	struct net_device *dev = to_net_dev(d);

  	const struct iw_statistics *iw;

  	ssize_t ret = -EINVAL;

  	if (!rtnl_trylock())
  		return restart_syscall();

  	if (dev_isalive(dev)) {

  		iw = get_wireless_stats(dev);
  		if (iw)

  			ret = (*format)(iw, buf);
  	}

  	rtnl_unlock();

  
  	return ret;
  }
  
  /* show function template for wireless fields */
  #define WIRELESS_SHOW(name, field, format_string)			\
  static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
  {									\
  	return sprintf(buf, format_string, iw->field);			\
  }									\

  static ssize_t show_iw_##name(struct device *d,				\
  			      struct device_attribute *attr, char *buf)	\

  {									\

  	return wireless_show(d, buf, format_iw_##name);			\

  }									\

  static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)

  
  WIRELESS_SHOW(status, status, fmt_hex);
  WIRELESS_SHOW(link, qual.qual, fmt_dec);
  WIRELESS_SHOW(level, qual.level, fmt_dec);
  WIRELESS_SHOW(noise, qual.noise, fmt_dec);
  WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
  WIRELESS_SHOW(crypt, discard.code, fmt_dec);
  WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
  WIRELESS_SHOW(misc, discard.misc, fmt_dec);
  WIRELESS_SHOW(retries, discard.retries, fmt_dec);
  WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
  
  static struct attribute *wireless_attrs[] = {

  	&dev_attr_status.attr,
  	&dev_attr_link.attr,
  	&dev_attr_level.attr,
  	&dev_attr_noise.attr,
  	&dev_attr_nwid.attr,
  	&dev_attr_crypt.attr,
  	&dev_attr_fragment.attr,
  	&dev_attr_retries.attr,
  	&dev_attr_misc.attr,
  	&dev_attr_beacon.attr,

  	NULL
  };
  
  static struct attribute_group wireless_group = {
  	.name = "wireless",
  	.attrs = wireless_attrs,
  };
  #endif

  #endif /* CONFIG_SYSFS */

  #ifdef CONFIG_RPS

  /*
   * RX queue sysfs structures and functions.
   */
  struct rx_queue_attribute {
  	struct attribute attr;
  	ssize_t (*show)(struct netdev_rx_queue *queue,
  	    struct rx_queue_attribute *attr, char *buf);
  	ssize_t (*store)(struct netdev_rx_queue *queue,
  	    struct rx_queue_attribute *attr, const char *buf, size_t len);
  };
  #define to_rx_queue_attr(_attr) container_of(_attr,		\
      struct rx_queue_attribute, attr)
  
  #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
  
  static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
  				  char *buf)
  {
  	struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
  	struct netdev_rx_queue *queue = to_rx_queue(kobj);
  
  	if (!attribute->show)
  		return -EIO;
  
  	return attribute->show(queue, attribute, buf);
  }
  
  static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
  				   const char *buf, size_t count)
  {
  	struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
  	struct netdev_rx_queue *queue = to_rx_queue(kobj);
  
  	if (!attribute->store)
  		return -EIO;
  
  	return attribute->store(queue, attribute, buf, count);
  }

  static const struct sysfs_ops rx_queue_sysfs_ops = {

  	.show = rx_queue_attr_show,
  	.store = rx_queue_attr_store,
  };
  
  static ssize_t show_rps_map(struct netdev_rx_queue *queue,
  			    struct rx_queue_attribute *attribute, char *buf)
  {
  	struct rps_map *map;
  	cpumask_var_t mask;
  	size_t len = 0;
  	int i;
  
  	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
  		return -ENOMEM;
  
  	rcu_read_lock();
  	map = rcu_dereference(queue->rps_map);
  	if (map)
  		for (i = 0; i < map->len; i++)
  			cpumask_set_cpu(map->cpus[i], mask);
  
  	len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
  	if (PAGE_SIZE - len < 3) {
  		rcu_read_unlock();
  		free_cpumask_var(mask);
  		return -EINVAL;
  	}
  	rcu_read_unlock();
  
  	free_cpumask_var(mask);
  	len += sprintf(buf + len, "
  ");
  	return len;
  }

  static ssize_t store_rps_map(struct netdev_rx_queue *queue,

  		      struct rx_queue_attribute *attribute,
  		      const char *buf, size_t len)
  {
  	struct rps_map *old_map, *map;
  	cpumask_var_t mask;
  	int err, cpu, i;
  	static DEFINE_SPINLOCK(rps_map_lock);
  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
  		return -ENOMEM;
  
  	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
  	if (err) {
  		free_cpumask_var(mask);
  		return err;
  	}
  
  	map = kzalloc(max_t(unsigned,
  	    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
  	    GFP_KERNEL);
  	if (!map) {
  		free_cpumask_var(mask);
  		return -ENOMEM;
  	}
  
  	i = 0;
  	for_each_cpu_and(cpu, mask, cpu_online_mask)
  		map->cpus[i++] = cpu;
  
  	if (i)
  		map->len = i;
  	else {
  		kfree(map);
  		map = NULL;
  	}
  
  	spin_lock(&rps_map_lock);

  	old_map = rcu_dereference_protected(queue->rps_map,
  					    lockdep_is_held(&rps_map_lock));

  	rcu_assign_pointer(queue->rps_map, map);
  	spin_unlock(&rps_map_lock);

  	if (map)
  		jump_label_inc(&rps_needed);
  	if (old_map) {

  		kfree_rcu(old_map, rcu);

  		jump_label_dec(&rps_needed);
  	}

  	free_cpumask_var(mask);
  	return len;
  }

  static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
  					   struct rx_queue_attribute *attr,
  					   char *buf)
  {
  	struct rps_dev_flow_table *flow_table;

  	unsigned long val = 0;

  
  	rcu_read_lock();
  	flow_table = rcu_dereference(queue->rps_flow_table);
  	if (flow_table)

  		val = (unsigned long)flow_table->mask + 1;

  	rcu_read_unlock();

  	return sprintf(buf, "%lu
  ", val);

  }
  
  static void rps_dev_flow_table_release_work(struct work_struct *work)
  {
  	struct rps_dev_flow_table *table = container_of(work,
  	    struct rps_dev_flow_table, free_work);
  
  	vfree(table);
  }
  
  static void rps_dev_flow_table_release(struct rcu_head *rcu)
  {
  	struct rps_dev_flow_table *table = container_of(rcu,
  	    struct rps_dev_flow_table, rcu);
  
  	INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
  	schedule_work(&table->free_work);
  }

  static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,

  				     struct rx_queue_attribute *attr,
  				     const char *buf, size_t len)
  {

  	unsigned long mask, count;

  	struct rps_dev_flow_table *table, *old_table;
  	static DEFINE_SPINLOCK(rps_dev_flow_lock);

  	int rc;

  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;

  	rc = kstrtoul(buf, 0, &count);
  	if (rc < 0)
  		return rc;

  
  	if (count) {

  		mask = count - 1;
  		/* mask = roundup_pow_of_two(count) - 1;
  		 * without overflows...
  		 */
  		while ((mask | (mask >> 1)) != mask)
  			mask |= (mask >> 1);
  		/* On 64 bit arches, must check mask fits in table->mask (u32),
  		 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
  		 * doesnt overflow.
  		 */
  #if BITS_PER_LONG > 32
  		if (mask > (unsigned long)(u32)mask)

  			return -EINVAL;

  #else
  		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))

  				/ sizeof(struct rps_dev_flow)) {

  			/* Enforce a limit to prevent overflow */
  			return -EINVAL;
  		}

  #endif
  		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));

  		if (!table)
  			return -ENOMEM;

  		table->mask = mask;
  		for (count = 0; count <= mask; count++)
  			table->flows[count].cpu = RPS_NO_CPU;

  	} else
  		table = NULL;
  
  	spin_lock(&rps_dev_flow_lock);

  	old_table = rcu_dereference_protected(queue->rps_flow_table,
  					      lockdep_is_held(&rps_dev_flow_lock));

  	rcu_assign_pointer(queue->rps_flow_table, table);
  	spin_unlock(&rps_dev_flow_lock);
  
  	if (old_table)
  		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
  
  	return len;
  }

  static struct rx_queue_attribute rps_cpus_attribute =
  	__ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);

  
  static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
  	__ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
  	    show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);

  static struct attribute *rx_queue_default_attrs[] = {
  	&rps_cpus_attribute.attr,

  	&rps_dev_flow_table_cnt_attribute.attr,

  	NULL
  };
  
  static void rx_queue_release(struct kobject *kobj)
  {
  	struct netdev_rx_queue *queue = to_rx_queue(kobj);

  	struct rps_map *map;
  	struct rps_dev_flow_table *flow_table;

  	map = rcu_dereference_protected(queue->rps_map, 1);

  	if (map) {
  		RCU_INIT_POINTER(queue->rps_map, NULL);

  		kfree_rcu(map, rcu);

  	}

  	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);

  	if (flow_table) {
  		RCU_INIT_POINTER(queue->rps_flow_table, NULL);

  		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);

  	}

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

  	dev_put(queue->dev);

  }
  
  static struct kobj_type rx_queue_ktype = {
  	.sysfs_ops = &rx_queue_sysfs_ops,
  	.release = rx_queue_release,
  	.default_attrs = rx_queue_default_attrs,
  };
  
  static int rx_queue_add_kobject(struct net_device *net, int index)
  {
  	struct netdev_rx_queue *queue = net->_rx + index;
  	struct kobject *kobj = &queue->kobj;
  	int error = 0;
  
  	kobj->kset = net->queues_kset;
  	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
  	    "rx-%u", index);
  	if (error) {
  		kobject_put(kobj);
  		return error;
  	}
  
  	kobject_uevent(kobj, KOBJ_ADD);

  	dev_hold(queue->dev);

  
  	return error;
  }

  #endif /* CONFIG_RPS */

  int
  net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)

  {

  #ifdef CONFIG_RPS

  	int i;
  	int error = 0;

  	for (i = old_num; i < new_num; i++) {

  		error = rx_queue_add_kobject(net, i);

  		if (error) {
  			new_num = old_num;

  			break;

  		}

  	}

  	while (--i >= new_num)
  		kobject_put(&net->_rx[i].kobj);

  
  	return error;

  #else
  	return 0;
  #endif

  }

  #ifdef CONFIG_SYSFS

  /*
   * netdev_queue sysfs structures and functions.
   */
  struct netdev_queue_attribute {
  	struct attribute attr;
  	ssize_t (*show)(struct netdev_queue *queue,
  	    struct netdev_queue_attribute *attr, char *buf);
  	ssize_t (*store)(struct netdev_queue *queue,
  	    struct netdev_queue_attribute *attr, const char *buf, size_t len);
  };
  #define to_netdev_queue_attr(_attr) container_of(_attr,		\
      struct netdev_queue_attribute, attr)
  
  #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
  
  static ssize_t netdev_queue_attr_show(struct kobject *kobj,
  				      struct attribute *attr, char *buf)
  {
  	struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
  	struct netdev_queue *queue = to_netdev_queue(kobj);
  
  	if (!attribute->show)
  		return -EIO;
  
  	return attribute->show(queue, attribute, buf);
  }
  
  static ssize_t netdev_queue_attr_store(struct kobject *kobj,
  				       struct attribute *attr,
  				       const char *buf, size_t count)
  {
  	struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
  	struct netdev_queue *queue = to_netdev_queue(kobj);
  
  	if (!attribute->store)
  		return -EIO;
  
  	return attribute->store(queue, attribute, buf, count);
  }
  
  static const struct sysfs_ops netdev_queue_sysfs_ops = {
  	.show = netdev_queue_attr_show,
  	.store = netdev_queue_attr_store,
  };

  static ssize_t show_trans_timeout(struct netdev_queue *queue,
  				  struct netdev_queue_attribute *attribute,
  				  char *buf)
  {
  	unsigned long trans_timeout;
  
  	spin_lock_irq(&queue->_xmit_lock);
  	trans_timeout = queue->trans_timeout;
  	spin_unlock_irq(&queue->_xmit_lock);
  
  	return sprintf(buf, "%lu", trans_timeout);
  }
  
  static struct netdev_queue_attribute queue_trans_timeout =
  	__ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);

  #ifdef CONFIG_BQL
  /*
   * Byte queue limits sysfs structures and functions.
   */
  static ssize_t bql_show(char *buf, unsigned int value)
  {
  	return sprintf(buf, "%u
  ", value);
  }
  
  static ssize_t bql_set(const char *buf, const size_t count,
  		       unsigned int *pvalue)
  {
  	unsigned int value;
  	int err;
  
  	if (!strcmp(buf, "max") || !strcmp(buf, "max
  "))
  		value = DQL_MAX_LIMIT;
  	else {
  		err = kstrtouint(buf, 10, &value);
  		if (err < 0)
  			return err;
  		if (value > DQL_MAX_LIMIT)
  			return -EINVAL;
  	}
  
  	*pvalue = value;
  
  	return count;
  }
  
  static ssize_t bql_show_hold_time(struct netdev_queue *queue,
  				  struct netdev_queue_attribute *attr,
  				  char *buf)
  {
  	struct dql *dql = &queue->dql;
  
  	return sprintf(buf, "%u
  ", jiffies_to_msecs(dql->slack_hold_time));
  }
  
  static ssize_t bql_set_hold_time(struct netdev_queue *queue,
  				 struct netdev_queue_attribute *attribute,
  				 const char *buf, size_t len)
  {
  	struct dql *dql = &queue->dql;
  	unsigned value;
  	int err;
  
  	err = kstrtouint(buf, 10, &value);
  	if (err < 0)
  		return err;
  
  	dql->slack_hold_time = msecs_to_jiffies(value);
  
  	return len;
  }
  
  static struct netdev_queue_attribute bql_hold_time_attribute =
  	__ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
  	    bql_set_hold_time);
  
  static ssize_t bql_show_inflight(struct netdev_queue *queue,
  				 struct netdev_queue_attribute *attr,
  				 char *buf)
  {
  	struct dql *dql = &queue->dql;
  
  	return sprintf(buf, "%u
  ", dql->num_queued - dql->num_completed);
  }
  
  static struct netdev_queue_attribute bql_inflight_attribute =
  	__ATTR(inflight, S_IRUGO | S_IWUSR, bql_show_inflight, NULL);
  
  #define BQL_ATTR(NAME, FIELD)						\
  static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
  				 struct netdev_queue_attribute *attr,	\
  				 char *buf)				\
  {									\
  	return bql_show(buf, queue->dql.FIELD);				\
  }									\
  									\
  static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
  				struct netdev_queue_attribute *attr,	\
  				const char *buf, size_t len)		\
  {									\
  	return bql_set(buf, len, &queue->dql.FIELD);			\
  }									\
  									\
  static struct netdev_queue_attribute bql_ ## NAME ## _attribute =	\
  	__ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,		\
  	    bql_set_ ## NAME);
  
  BQL_ATTR(limit, limit)
  BQL_ATTR(limit_max, max_limit)
  BQL_ATTR(limit_min, min_limit)
  
  static struct attribute *dql_attrs[] = {
  	&bql_limit_attribute.attr,
  	&bql_limit_max_attribute.attr,
  	&bql_limit_min_attribute.attr,
  	&bql_hold_time_attribute.attr,
  	&bql_inflight_attribute.attr,
  	NULL
  };
  
  static struct attribute_group dql_group = {
  	.name  = "byte_queue_limits",
  	.attrs  = dql_attrs,
  };
  #endif /* CONFIG_BQL */

  #ifdef CONFIG_XPS

  static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)

  {

  	struct net_device *dev = queue->dev;
  	int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++)
  		if (queue == &dev->_tx[i])
  			break;
  
  	BUG_ON(i >= dev->num_tx_queues);
  
  	return i;
  }
  
  
  static ssize_t show_xps_map(struct netdev_queue *queue,
  			    struct netdev_queue_attribute *attribute, char *buf)
  {
  	struct net_device *dev = queue->dev;
  	struct xps_dev_maps *dev_maps;
  	cpumask_var_t mask;
  	unsigned long index;
  	size_t len = 0;
  	int i;
  
  	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
  		return -ENOMEM;
  
  	index = get_netdev_queue_index(queue);
  
  	rcu_read_lock();
  	dev_maps = rcu_dereference(dev->xps_maps);
  	if (dev_maps) {
  		for_each_possible_cpu(i) {
  			struct xps_map *map =
  			    rcu_dereference(dev_maps->cpu_map[i]);
  			if (map) {
  				int j;
  				for (j = 0; j < map->len; j++) {
  					if (map->queues[j] == index) {
  						cpumask_set_cpu(i, mask);
  						break;
  					}
  				}
  			}
  		}
  	}
  	rcu_read_unlock();
  
  	len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
  	if (PAGE_SIZE - len < 3) {
  		free_cpumask_var(mask);
  		return -EINVAL;
  	}
  
  	free_cpumask_var(mask);
  	len += sprintf(buf + len, "
  ");
  	return len;
  }

  static DEFINE_MUTEX(xps_map_mutex);

  #define xmap_dereference(P)		\
  	rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))

  static void xps_queue_release(struct netdev_queue *queue)
  {
  	struct net_device *dev = queue->dev;
  	struct xps_dev_maps *dev_maps;
  	struct xps_map *map;
  	unsigned long index;
  	int i, pos, nonempty = 0;
  
  	index = get_netdev_queue_index(queue);
  
  	mutex_lock(&xps_map_mutex);
  	dev_maps = xmap_dereference(dev->xps_maps);
  
  	if (dev_maps) {
  		for_each_possible_cpu(i) {
  			map = xmap_dereference(dev_maps->cpu_map[i]);
  			if (!map)
  				continue;
  
  			for (pos = 0; pos < map->len; pos++)
  				if (map->queues[pos] == index)
  					break;
  
  			if (pos < map->len) {
  				if (map->len > 1)
  					map->queues[pos] =
  					    map->queues[--map->len];
  				else {
  					RCU_INIT_POINTER(dev_maps->cpu_map[i],
  					    NULL);
  					kfree_rcu(map, rcu);
  					map = NULL;
  				}
  			}
  			if (map)
  				nonempty = 1;
  		}
  
  		if (!nonempty) {
  			RCU_INIT_POINTER(dev->xps_maps, NULL);
  			kfree_rcu(dev_maps, rcu);
  		}
  	}
  	mutex_unlock(&xps_map_mutex);
  }

  static ssize_t store_xps_map(struct netdev_queue *queue,
  		      struct netdev_queue_attribute *attribute,
  		      const char *buf, size_t len)
  {
  	struct net_device *dev = queue->dev;
  	cpumask_var_t mask;
  	int err, i, cpu, pos, map_len, alloc_len, need_set;
  	unsigned long index;
  	struct xps_map *map, *new_map;
  	struct xps_dev_maps *dev_maps, *new_dev_maps;
  	int nonempty = 0;

  	int numa_node_id = -2;

  
  	if (!capable(CAP_NET_ADMIN))
  		return -EPERM;
  
  	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
  		return -ENOMEM;
  
  	index = get_netdev_queue_index(queue);
  
  	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
  	if (err) {
  		free_cpumask_var(mask);
  		return err;
  	}
  
  	new_dev_maps = kzalloc(max_t(unsigned,
  	    XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
  	if (!new_dev_maps) {
  		free_cpumask_var(mask);
  		return -ENOMEM;
  	}
  
  	mutex_lock(&xps_map_mutex);

  	dev_maps = xmap_dereference(dev->xps_maps);

  
  	for_each_possible_cpu(cpu) {

  		map = dev_maps ?
  			xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
  		new_map = map;

  		if (map) {
  			for (pos = 0; pos < map->len; pos++)
  				if (map->queues[pos] == index)
  					break;
  			map_len = map->len;
  			alloc_len = map->alloc_len;
  		} else
  			pos = map_len = alloc_len = 0;

  		need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);

  #ifdef CONFIG_NUMA
  		if (need_set) {

  			if (numa_node_id == -2)
  				numa_node_id = cpu_to_node(cpu);
  			else if (numa_node_id != cpu_to_node(cpu))
  				numa_node_id = -1;

  		}
  #endif

  		if (need_set && pos >= map_len) {
  			/* Need to add queue to this CPU's map */
  			if (map_len >= alloc_len) {
  				alloc_len = alloc_len ?
  				    2 * alloc_len : XPS_MIN_MAP_ALLOC;

  				new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
  						       GFP_KERNEL,
  						       cpu_to_node(cpu));

  				if (!new_map)
  					goto error;
  				new_map->alloc_len = alloc_len;
  				for (i = 0; i < map_len; i++)
  					new_map->queues[i] = map->queues[i];
  				new_map->len = map_len;
  			}
  			new_map->queues[new_map->len++] = index;
  		} else if (!need_set && pos < map_len) {
  			/* Need to remove queue from this CPU's map */
  			if (map_len > 1)
  				new_map->queues[pos] =
  				    new_map->queues[--new_map->len];
  			else
  				new_map = NULL;
  		}

  		RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);

  	}
  
  	/* Cleanup old maps */
  	for_each_possible_cpu(cpu) {

  		map = dev_maps ?
  			xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
  		if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)

  			kfree_rcu(map, rcu);

  		if (new_dev_maps->cpu_map[cpu])
  			nonempty = 1;
  	}

  	if (nonempty) {
  		rcu_assign_pointer(dev->xps_maps, new_dev_maps);
  	} else {

  		kfree(new_dev_maps);

  		RCU_INIT_POINTER(dev->xps_maps, NULL);

  	}
  
  	if (dev_maps)

  		kfree_rcu(dev_maps, rcu);

  	netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :

  					    NUMA_NO_NODE);

  	mutex_unlock(&xps_map_mutex);
  
  	free_cpumask_var(mask);
  	return len;
  
  error:
  	mutex_unlock(&xps_map_mutex);
  
  	if (new_dev_maps)
  		for_each_possible_cpu(i)

  			kfree(rcu_dereference_protected(
  				new_dev_maps->cpu_map[i],
  				1));

  	kfree(new_dev_maps);
  	free_cpumask_var(mask);
  	return -ENOMEM;
  }
  
  static struct netdev_queue_attribute xps_cpus_attribute =
      __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);

  #endif /* CONFIG_XPS */

  
  static struct attribute *netdev_queue_default_attrs[] = {

  	&queue_trans_timeout.attr,
  #ifdef CONFIG_XPS

  	&xps_cpus_attribute.attr,

  #endif

  	NULL
  };
  
  static void netdev_queue_release(struct kobject *kobj)
  {
  	struct netdev_queue *queue = to_netdev_queue(kobj);

  #ifdef CONFIG_XPS

  	xps_queue_release(queue);

  #endif

  
  	memset(kobj, 0, sizeof(*kobj));
  	dev_put(queue->dev);
  }
  
  static struct kobj_type netdev_queue_ktype = {
  	.sysfs_ops = &netdev_queue_sysfs_ops,
  	.release = netdev_queue_release,
  	.default_attrs = netdev_queue_default_attrs,
  };
  
  static int netdev_queue_add_kobject(struct net_device *net, int index)
  {
  	struct netdev_queue *queue = net->_tx + index;
  	struct kobject *kobj = &queue->kobj;
  	int error = 0;
  
  	kobj->kset = net->queues_kset;
  	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
  	    "tx-%u", index);

  	if (error)
  		goto exit;
  
  #ifdef CONFIG_BQL
  	error = sysfs_create_group(kobj, &dql_group);
  	if (error)
  		goto exit;
  #endif

  
  	kobject_uevent(kobj, KOBJ_ADD);
  	dev_hold(queue->dev);

  	return 0;
  exit:
  	kobject_put(kobj);

  	return error;
  }

  #endif /* CONFIG_SYSFS */

  
  int
  netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
  {

  #ifdef CONFIG_SYSFS

  	int i;
  	int error = 0;
  
  	for (i = old_num; i < new_num; i++) {
  		error = netdev_queue_add_kobject(net, i);
  		if (error) {
  			new_num = old_num;
  			break;
  		}
  	}

  	while (--i >= new_num) {
  		struct netdev_queue *queue = net->_tx + i;
  
  #ifdef CONFIG_BQL
  		sysfs_remove_group(&queue->kobj, &dql_group);
  #endif
  		kobject_put(&queue->kobj);
  	}

  
  	return error;

  #else
  	return 0;

  #endif /* CONFIG_SYSFS */

  }
  
  static int register_queue_kobjects(struct net_device *net)
  {

  	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;

  #ifdef CONFIG_SYSFS

  	net->queues_kset = kset_create_and_add("queues",
  	    NULL, &net->dev.kobj);
  	if (!net->queues_kset)
  		return -ENOMEM;

  #endif
  
  #ifdef CONFIG_RPS
  	real_rx = net->real_num_rx_queues;
  #endif
  	real_tx = net->real_num_tx_queues;

  	error = net_rx_queue_update_kobjects(net, 0, real_rx);

  	if (error)
  		goto error;

  	rxq = real_rx;

  	error = netdev_queue_update_kobjects(net, 0, real_tx);

  	if (error)
  		goto error;

  	txq = real_tx;

  
  	return 0;
  
  error:
  	netdev_queue_update_kobjects(net, txq, 0);
  	net_rx_queue_update_kobjects(net, rxq, 0);
  	return error;

  }

  static void remove_queue_kobjects(struct net_device *net)

  {

  	int real_rx = 0, real_tx = 0;
  
  #ifdef CONFIG_RPS
  	real_rx = net->real_num_rx_queues;
  #endif
  	real_tx = net->real_num_tx_queues;
  
  	net_rx_queue_update_kobjects(net, real_rx, 0);
  	netdev_queue_update_kobjects(net, real_tx, 0);

  #ifdef CONFIG_SYSFS

  	kset_unregister(net->queues_kset);

  #endif

  }

  static void *net_grab_current_ns(void)

  {

  	struct net *ns = current->nsproxy->net_ns;
  #ifdef CONFIG_NET_NS
  	if (ns)
  		atomic_inc(&ns->passive);
  #endif
  	return ns;

  }
  
  static const void *net_initial_ns(void)
  {
  	return &init_net;
  }
  
  static const void *net_netlink_ns(struct sock *sk)
  {
  	return sock_net(sk);
  }

  struct kobj_ns_type_operations net_ns_type_operations = {

  	.type = KOBJ_NS_TYPE_NET,

  	.grab_current_ns = net_grab_current_ns,

  	.netlink_ns = net_netlink_ns,
  	.initial_ns = net_initial_ns,

  	.drop_ns = net_drop_ns,

  };

  EXPORT_SYMBOL_GPL(net_ns_type_operations);

  #ifdef CONFIG_HOTPLUG

  static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)

  {

  	struct net_device *dev = to_net_dev(d);

  	int retval;

  	/* pass interface to uevent. */

  	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);

  	if (retval)
  		goto exit;

  	/* pass ifindex to uevent.
  	 * ifindex is useful as it won't change (interface name may change)
  	 * and is what RtNetlink uses natively. */

  	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);

  exit:

  	return retval;

  }
  #endif
  
  /*

   *	netdev_release -- destroy and free a dead device.

   *	Called when last reference to device kobject is gone.

   */

  static void netdev_release(struct device *d)

  {

  	struct net_device *dev = to_net_dev(d);

  
  	BUG_ON(dev->reg_state != NETREG_RELEASED);

  	kfree(dev->ifalias);

  	kfree((char *)dev - dev->padded);
  }

  static const void *net_namespace(struct device *d)
  {
  	struct net_device *dev;
  	dev = container_of(d, struct net_device, dev);
  	return dev_net(dev);
  }

  static struct class net_class = {
  	.name = "net",

  	.dev_release = netdev_release,

  #ifdef CONFIG_SYSFS

  	.dev_attrs = net_class_attributes,

  #endif /* CONFIG_SYSFS */

  #ifdef CONFIG_HOTPLUG

  	.dev_uevent = netdev_uevent,

  #endif

  	.ns_type = &net_ns_type_operations,
  	.namespace = net_namespace,

  };

  /* Delete sysfs entries but hold kobject reference until after all
   * netdev references are gone.
   */

  void netdev_unregister_kobject(struct net_device * net)

  {

  	struct device *dev = &(net->dev);
  
  	kobject_get(&dev->kobj);

  	remove_queue_kobjects(net);

  	device_del(dev);

  }
  
  /* Create sysfs entries for network device. */

  int netdev_register_kobject(struct net_device *net)

  {

  	struct device *dev = &(net->dev);

  	const struct attribute_group **groups = net->sysfs_groups;

  	int error = 0;

  	device_initialize(dev);

  	dev->class = &net_class;
  	dev->platform_data = net;
  	dev->groups = groups;

  	dev_set_name(dev, "%s", net->name);

  #ifdef CONFIG_SYSFS

  	/* Allow for a device specific group */
  	if (*groups)
  		groups++;

  	*groups++ = &netstat_group;

  #ifdef CONFIG_WIRELESS_EXT_SYSFS

  	if (net->ieee80211_ptr)

  		*groups++ = &wireless_group;

  #ifdef CONFIG_WIRELESS_EXT
  	else if (net->wireless_handlers)
  		*groups++ = &wireless_group;
  #endif

  #endif

  #endif /* CONFIG_SYSFS */

  	error = device_add(dev);
  	if (error)
  		return error;

  	error = register_queue_kobjects(net);

  	if (error) {
  		device_del(dev);
  		return error;
  	}
  
  	return error;

  }

  int netdev_class_create_file(struct class_attribute *class_attr)
  {
  	return class_create_file(&net_class, class_attr);
  }

  EXPORT_SYMBOL(netdev_class_create_file);

  
  void netdev_class_remove_file(struct class_attribute *class_attr)
  {
  	class_remove_file(&net_class, class_attr);
  }

  EXPORT_SYMBOL(netdev_class_remove_file);

  int netdev_kobject_init(void)

  {

  	kobj_ns_type_register(&net_ns_type_operations);

  	return class_register(&net_class);
  }