text: /*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Definitions for the Interfaces handler.
   *
   * Version:	@(#)dev.h	1.0.10	08/12/93
   *
   * Authors:	Ross Biro
   *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   *		Corey Minyard <wf-rch!minyard@relay.EU.net>
   *		Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
   *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
   *		Bjorn Ekwall. <bj0rn@blox.se>
   *              Pekka Riikonen <priikone@poseidon.pspt.fi>
   *
   *		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.
   *
   *		Moved to /usr/include/linux for NET3
   */
  #ifndef _LINUX_NETDEVICE_H
  #define _LINUX_NETDEVICE_H
  
  #include <linux/pm_qos.h>
  #include <linux/timer.h>
  #include <linux/bug.h>
  #include <linux/delay.h>
  #include <linux/atomic.h>
  #include <asm/cache.h>
  #include <asm/byteorder.h>
  
  #include <linux/percpu.h>
  #include <linux/rculist.h>
  #include <linux/dmaengine.h>
  #include <linux/workqueue.h>
  #include <linux/dynamic_queue_limits.h>
  
  #include <linux/ethtool.h>
  #include <net/net_namespace.h>
  #include <net/dsa.h>
  #ifdef CONFIG_DCB
  #include <net/dcbnl.h>
  #endif
  #include <net/netprio_cgroup.h>
  
  #include <linux/netdev_features.h>
  #include <linux/neighbour.h>
  #include <uapi/linux/netdevice.h>
  
  struct netpoll_info;
  struct device;
  struct phy_device;
  /* 802.11 specific */
  struct wireless_dev;
  
  void netdev_set_default_ethtool_ops(struct net_device *dev,
  				    const struct ethtool_ops *ops);
  
  /* Backlog congestion levels */
  #define NET_RX_SUCCESS		0	/* keep 'em coming, baby */
  #define NET_RX_DROP		1	/* packet dropped */
  
  /*
   * Transmit return codes: transmit return codes originate from three different
   * namespaces:
   *
   * - qdisc return codes
   * - driver transmit return codes
   * - errno values
   *
   * Drivers are allowed to return any one of those in their hard_start_xmit()
   * function. Real network devices commonly used with qdiscs should only return
   * the driver transmit return codes though - when qdiscs are used, the actual
   * transmission happens asynchronously, so the value is not propagated to
   * higher layers. Virtual network devices transmit synchronously, in this case
   * the driver transmit return codes are consumed by dev_queue_xmit(), all
   * others are propagated to higher layers.
   */
  
  /* qdisc ->enqueue() return codes. */
  #define NET_XMIT_SUCCESS	0x00
  #define NET_XMIT_DROP		0x01	/* skb dropped			*/
  #define NET_XMIT_CN		0x02	/* congestion notification	*/
  #define NET_XMIT_POLICED	0x03	/* skb is shot by police	*/
  #define NET_XMIT_MASK		0x0f	/* qdisc flags in net/sch_generic.h */
  
  /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
   * indicates that the device will soon be dropping packets, or already drops
   * some packets of the same priority; prompting us to send less aggressively. */
  #define net_xmit_eval(e)	((e) == NET_XMIT_CN ? 0 : (e))
  #define net_xmit_errno(e)	((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  
  /* Driver transmit return codes */
  #define NETDEV_TX_MASK		0xf0
  
  enum netdev_tx {
  	__NETDEV_TX_MIN	 = INT_MIN,	/* make sure enum is signed */
  	NETDEV_TX_OK	 = 0x00,	/* driver took care of packet */
  	NETDEV_TX_BUSY	 = 0x10,	/* driver tx path was busy*/
  	NETDEV_TX_LOCKED = 0x20,	/* driver tx lock was already taken */
  };
  typedef enum netdev_tx netdev_tx_t;
  
  /*
   * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
   * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
   */
  static inline bool dev_xmit_complete(int rc)
  {
  	/*
  	 * Positive cases with an skb consumed by a driver:
  	 * - successful transmission (rc == NETDEV_TX_OK)
  	 * - error while transmitting (rc < 0)
  	 * - error while queueing to a different device (rc & NET_XMIT_MASK)
  	 */
  	if (likely(rc < NET_XMIT_MASK))
  		return true;
  
  	return false;
  }
  
  /*
   *	Compute the worst case header length according to the protocols
   *	used.
   */
  
  #if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
  # if defined(CONFIG_MAC80211_MESH)
  #  define LL_MAX_HEADER 128
  # else
  #  define LL_MAX_HEADER 96
  # endif
  #else
  # define LL_MAX_HEADER 32
  #endif
  
  #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
      !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
  #define MAX_HEADER LL_MAX_HEADER
  #else
  #define MAX_HEADER (LL_MAX_HEADER + 48)
  #endif
  
  /*
   *	Old network device statistics. Fields are native words
   *	(unsigned long) so they can be read and written atomically.
   */
  
  struct net_device_stats {
  	unsigned long	rx_packets;
  	unsigned long	tx_packets;
  	unsigned long	rx_bytes;
  	unsigned long	tx_bytes;
  	unsigned long	rx_errors;
  	unsigned long	tx_errors;
  	unsigned long	rx_dropped;
  	unsigned long	tx_dropped;
  	unsigned long	multicast;
  	unsigned long	collisions;
  	unsigned long	rx_length_errors;
  	unsigned long	rx_over_errors;
  	unsigned long	rx_crc_errors;
  	unsigned long	rx_frame_errors;
  	unsigned long	rx_fifo_errors;
  	unsigned long	rx_missed_errors;
  	unsigned long	tx_aborted_errors;
  	unsigned long	tx_carrier_errors;
  	unsigned long	tx_fifo_errors;
  	unsigned long	tx_heartbeat_errors;
  	unsigned long	tx_window_errors;
  	unsigned long	rx_compressed;
  	unsigned long	tx_compressed;
  };
  
  
  #include <linux/cache.h>
  #include <linux/skbuff.h>
  
  #ifdef CONFIG_RPS
  #include <linux/static_key.h>
  extern struct static_key rps_needed;
  #endif
  
  struct neighbour;
  struct neigh_parms;
  struct sk_buff;
  
  struct netdev_hw_addr {
  	struct list_head	list;
  	unsigned char		addr[MAX_ADDR_LEN];
  	unsigned char		type;
  #define NETDEV_HW_ADDR_T_LAN		1
  #define NETDEV_HW_ADDR_T_SAN		2
  #define NETDEV_HW_ADDR_T_SLAVE		3
  #define NETDEV_HW_ADDR_T_UNICAST	4
  #define NETDEV_HW_ADDR_T_MULTICAST	5
  	bool			global_use;
  	int			sync_cnt;
  	int			refcount;
  	int			synced;
  	struct rcu_head		rcu_head;
  };
  
  struct netdev_hw_addr_list {
  	struct list_head	list;
  	int			count;
  };
  
  #define netdev_hw_addr_list_count(l) ((l)->count)
  #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
  #define netdev_hw_addr_list_for_each(ha, l) \
  	list_for_each_entry(ha, &(l)->list, list)
  
  #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
  #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
  #define netdev_for_each_uc_addr(ha, dev) \
  	netdev_hw_addr_list_for_each(ha, &(dev)->uc)
  
  #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
  #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
  #define netdev_for_each_mc_addr(ha, dev) \
  	netdev_hw_addr_list_for_each(ha, &(dev)->mc)
  
  struct hh_cache {
  	u16		hh_len;
  	u16		__pad;
  	seqlock_t	hh_lock;
  
  	/* cached hardware header; allow for machine alignment needs.        */
  #define HH_DATA_MOD	16
  #define HH_DATA_OFF(__len) \
  	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
  #define HH_DATA_ALIGN(__len) \
  	(((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
  	unsigned long	hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
  };
  
  /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
   * Alternative is:
   *   dev->hard_header_len ? (dev->hard_header_len +
   *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
   *
   * We could use other alignment values, but we must maintain the
   * relationship HH alignment <= LL alignment.
   */
  #define LL_RESERVED_SPACE(dev) \
  	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
  #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
  	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
  
  struct header_ops {
  	int	(*create) (struct sk_buff *skb, struct net_device *dev,
  			   unsigned short type, const void *daddr,
  			   const void *saddr, unsigned int len);
  	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
  	int	(*rebuild)(struct sk_buff *skb);
  	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
  	void	(*cache_update)(struct hh_cache *hh,
  				const struct net_device *dev,
  				const unsigned char *haddr);
  };
  
  /* These flag bits are private to the generic network queueing
   * layer, they may not be explicitly referenced by any other
   * code.
   */
  
  enum netdev_state_t {
  	__LINK_STATE_START,
  	__LINK_STATE_PRESENT,
  	__LINK_STATE_NOCARRIER,
  	__LINK_STATE_LINKWATCH_PENDING,
  	__LINK_STATE_DORMANT,
  };
  
  
  /*
   * This structure holds at boot time configured netdevice settings. They
   * are then used in the device probing.
   */
  struct netdev_boot_setup {
  	char name[IFNAMSIZ];
  	struct ifmap map;
  };
  #define NETDEV_BOOT_SETUP_MAX 8
  
  int __init netdev_boot_setup(char *str);
  
  /*
   * Structure for NAPI scheduling similar to tasklet but with weighting
   */
  struct napi_struct {
  	/* The poll_list must only be managed by the entity which
  	 * changes the state of the NAPI_STATE_SCHED bit.  This means
  	 * whoever atomically sets that bit can add this napi_struct
  	 * to the per-cpu poll_list, and whoever clears that bit
  	 * can remove from the list right before clearing the bit.
  	 */
  	struct list_head	poll_list;
  
  	unsigned long		state;
  	int			weight;
  	unsigned int		gro_count;
  	int			(*poll)(struct napi_struct *, int);
  #ifdef CONFIG_NETPOLL
  	spinlock_t		poll_lock;
  	int			poll_owner;
  #endif
  	struct net_device	*dev;
  	struct sk_buff		*gro_list;
  	struct sk_buff		*skb;
  	struct list_head	dev_list;
  	struct hlist_node	napi_hash_node;
  	unsigned int		napi_id;
  };
  
  enum {
  	NAPI_STATE_SCHED,	/* Poll is scheduled */
  	NAPI_STATE_DISABLE,	/* Disable pending */
  	NAPI_STATE_NPSVC,	/* Netpoll - don't dequeue from poll_list */
  	NAPI_STATE_HASHED,	/* In NAPI hash */
  };
  
  enum gro_result {
  	GRO_MERGED,
  	GRO_MERGED_FREE,
  	GRO_HELD,
  	GRO_NORMAL,
  	GRO_DROP,
  };
  typedef enum gro_result gro_result_t;
  
  /*
   * enum rx_handler_result - Possible return values for rx_handlers.
   * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
   * further.
   * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
   * case skb->dev was changed by rx_handler.
   * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
   * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
   *
   * rx_handlers are functions called from inside __netif_receive_skb(), to do
   * special processing of the skb, prior to delivery to protocol handlers.
   *
   * Currently, a net_device can only have a single rx_handler registered. Trying
   * to register a second rx_handler will return -EBUSY.
   *
   * To register a rx_handler on a net_device, use netdev_rx_handler_register().
   * To unregister a rx_handler on a net_device, use
   * netdev_rx_handler_unregister().
   *
   * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
   * do with the skb.
   *
   * If the rx_handler consumed to skb in some way, it should return
   * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
   * the skb to be delivered in some other ways.
   *
   * If the rx_handler changed skb->dev, to divert the skb to another
   * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
   * new device will be called if it exists.
   *
   * If the rx_handler consider the skb should be ignored, it should return
   * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
   * are registered on exact device (ptype->dev == skb->dev).
   *
   * If the rx_handler didn't changed skb->dev, but want the skb to be normally
   * delivered, it should return RX_HANDLER_PASS.
   *
   * A device without a registered rx_handler will behave as if rx_handler
   * returned RX_HANDLER_PASS.
   */
  
  enum rx_handler_result {
  	RX_HANDLER_CONSUMED,
  	RX_HANDLER_ANOTHER,
  	RX_HANDLER_EXACT,
  	RX_HANDLER_PASS,
  };
  typedef enum rx_handler_result rx_handler_result_t;
  typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
  
  void __napi_schedule(struct napi_struct *n);
  
  static inline bool napi_disable_pending(struct napi_struct *n)
  {
  	return test_bit(NAPI_STATE_DISABLE, &n->state);
  }
  
  /**
   *	napi_schedule_prep - check if napi can be scheduled
   *	@n: napi context
   *
   * Test if NAPI routine is already running, and if not mark
   * it as running.  This is used as a condition variable
   * insure only one NAPI poll instance runs.  We also make
   * sure there is no pending NAPI disable.
   */
  static inline bool napi_schedule_prep(struct napi_struct *n)
  {
  	return !napi_disable_pending(n) &&
  		!test_and_set_bit(NAPI_STATE_SCHED, &n->state);
  }
  
  /**
   *	napi_schedule - schedule NAPI poll
   *	@n: napi context
   *
   * Schedule NAPI poll routine to be called if it is not already
   * running.
   */
  static inline void napi_schedule(struct napi_struct *n)
  {
  	if (napi_schedule_prep(n))
  		__napi_schedule(n);
  }
  
  /* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
  static inline bool napi_reschedule(struct napi_struct *napi)
  {
  	if (napi_schedule_prep(napi)) {
  		__napi_schedule(napi);
  		return true;
  	}
  	return false;
  }
  
  /**
   *	napi_complete - NAPI processing complete
   *	@n: napi context
   *
   * Mark NAPI processing as complete.
   */
  void __napi_complete(struct napi_struct *n);
  void napi_complete(struct napi_struct *n);
  
  /**
   *	napi_by_id - lookup a NAPI by napi_id
   *	@napi_id: hashed napi_id
   *
   * lookup @napi_id in napi_hash table
   * must be called under rcu_read_lock()
   */
  struct napi_struct *napi_by_id(unsigned int napi_id);
  
  /**
   *	napi_hash_add - add a NAPI to global hashtable
   *	@napi: napi context
   *
   * generate a new napi_id and store a @napi under it in napi_hash
   */
  void napi_hash_add(struct napi_struct *napi);
  
  /**
   *	napi_hash_del - remove a NAPI from global table
   *	@napi: napi context
   *
   * Warning: caller must observe rcu grace period
   * before freeing memory containing @napi
   */
  void napi_hash_del(struct napi_struct *napi);
  
  /**
   *	napi_disable - prevent NAPI from scheduling
   *	@n: napi context
   *
   * Stop NAPI from being scheduled on this context.
   * Waits till any outstanding processing completes.
   */
  static inline void napi_disable(struct napi_struct *n)
  {
  	might_sleep();
  	set_bit(NAPI_STATE_DISABLE, &n->state);
  	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
  		msleep(1);
  	clear_bit(NAPI_STATE_DISABLE, &n->state);
  }
  
  /**
   *	napi_enable - enable NAPI scheduling
   *	@n: napi context
   *
   * Resume NAPI from being scheduled on this context.
   * Must be paired with napi_disable.
   */
  static inline void napi_enable(struct napi_struct *n)
  {
  	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
  	smp_mb__before_atomic();
  	clear_bit(NAPI_STATE_SCHED, &n->state);
  }
  
  #ifdef CONFIG_SMP
  /**
   *	napi_synchronize - wait until NAPI is not running
   *	@n: napi context
   *
   * Wait until NAPI is done being scheduled on this context.
   * Waits till any outstanding processing completes but
   * does not disable future activations.
   */
  static inline void napi_synchronize(const struct napi_struct *n)
  {
  	while (test_bit(NAPI_STATE_SCHED, &n->state))
  		msleep(1);
  }
  #else
  # define napi_synchronize(n)	barrier()
  #endif
  
  enum netdev_queue_state_t {
  	__QUEUE_STATE_DRV_XOFF,
  	__QUEUE_STATE_STACK_XOFF,
  	__QUEUE_STATE_FROZEN,
  };
  
  #define QUEUE_STATE_DRV_XOFF	(1 << __QUEUE_STATE_DRV_XOFF)
  #define QUEUE_STATE_STACK_XOFF	(1 << __QUEUE_STATE_STACK_XOFF)
  #define QUEUE_STATE_FROZEN	(1 << __QUEUE_STATE_FROZEN)
  
  #define QUEUE_STATE_ANY_XOFF	(QUEUE_STATE_DRV_XOFF | QUEUE_STATE_STACK_XOFF)
  #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
  					QUEUE_STATE_FROZEN)
  #define QUEUE_STATE_DRV_XOFF_OR_FROZEN (QUEUE_STATE_DRV_XOFF | \
  					QUEUE_STATE_FROZEN)
  
  /*
   * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
   * netif_tx_* functions below are used to manipulate this flag.  The
   * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
   * queue independently.  The netif_xmit_*stopped functions below are called
   * to check if the queue has been stopped by the driver or stack (either
   * of the XOFF bits are set in the state).  Drivers should not need to call
   * netif_xmit*stopped functions, they should only be using netif_tx_*.
   */
  
  struct netdev_queue {
  /*
   * read mostly part
   */
  	struct net_device	*dev;
  	struct Qdisc		*qdisc;
  	struct Qdisc		*qdisc_sleeping;
  #ifdef CONFIG_SYSFS
  	struct kobject		kobj;
  #endif
  #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  	int			numa_node;
  #endif
  /*
   * write mostly part
   */
  	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
  	int			xmit_lock_owner;
  	/*
  	 * please use this field instead of dev->trans_start
  	 */
  	unsigned long		trans_start;
  
  	/*
  	 * Number of TX timeouts for this queue
  	 * (/sys/class/net/DEV/Q/trans_timeout)
  	 */
  	unsigned long		trans_timeout;
  
  	unsigned long		state;
  
  #ifdef CONFIG_BQL
  	struct dql		dql;
  #endif
  } ____cacheline_aligned_in_smp;
  
  static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
  {
  #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  	return q->numa_node;
  #else
  	return NUMA_NO_NODE;
  #endif
  }
  
  static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
  {
  #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  	q->numa_node = node;
  #endif
  }
  
  #ifdef CONFIG_RPS
  /*
   * This structure holds an RPS map which can be of variable length.  The
   * map is an array of CPUs.
   */
  struct rps_map {
  	unsigned int len;
  	struct rcu_head rcu;
  	u16 cpus[0];
  };
  #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
  
  /*
   * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
   * tail pointer for that CPU's input queue at the time of last enqueue, and
   * a hardware filter index.
   */
  struct rps_dev_flow {
  	u16 cpu;
  	u16 filter;
  	unsigned int last_qtail;
  };
  #define RPS_NO_FILTER 0xffff
  
  /*
   * The rps_dev_flow_table structure contains a table of flow mappings.
   */
  struct rps_dev_flow_table {
  	unsigned int mask;
  	struct rcu_head rcu;
  	struct rps_dev_flow flows[0];
  };
  #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
      ((_num) * sizeof(struct rps_dev_flow)))
  
  /*
   * The rps_sock_flow_table contains mappings of flows to the last CPU
   * on which they were processed by the application (set in recvmsg).
   */
  struct rps_sock_flow_table {
  	unsigned int mask;
  	u16 ents[0];
  };
  #define	RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
      ((_num) * sizeof(u16)))
  
  #define RPS_NO_CPU 0xffff
  
  static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
  					u32 hash)
  {
  	if (table && hash) {
  		unsigned int cpu, index = hash & table->mask;
  
  		/* We only give a hint, preemption can change cpu under us */
  		cpu = raw_smp_processor_id();
  
  		if (table->ents[index] != cpu)
  			table->ents[index] = cpu;
  	}
  }
  
  static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
  				       u32 hash)
  {
  	if (table && hash)
  		table->ents[hash & table->mask] = RPS_NO_CPU;
  }
  
  extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
  
  #ifdef CONFIG_RFS_ACCEL
  bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
  			 u16 filter_id);
  #endif
  #endif /* CONFIG_RPS */
  
  /* This structure contains an instance of an RX queue. */
  struct netdev_rx_queue {
  #ifdef CONFIG_RPS
  	struct rps_map __rcu		*rps_map;
  	struct rps_dev_flow_table __rcu	*rps_flow_table;
  #endif
  	struct kobject			kobj;
  	struct net_device		*dev;
  } ____cacheline_aligned_in_smp;
  
  /*
   * 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);
  };
  
  #ifdef CONFIG_XPS
  /*
   * This structure holds an XPS map which can be of variable length.  The
   * map is an array of queues.
   */
  struct xps_map {
  	unsigned int len;
  	unsigned int alloc_len;
  	struct rcu_head rcu;
  	u16 queues[0];
  };
  #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
  #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))	\
      / sizeof(u16))
  
  /*
   * This structure holds all XPS maps for device.  Maps are indexed by CPU.
   */
  struct xps_dev_maps {
  	struct rcu_head rcu;
  	struct xps_map __rcu *cpu_map[0];
  };
  #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +		\
      (nr_cpu_ids * sizeof(struct xps_map *)))
  #endif /* CONFIG_XPS */
  
  #define TC_MAX_QUEUE	16
  #define TC_BITMASK	15
  /* HW offloaded queuing disciplines txq count and offset maps */
  struct netdev_tc_txq {
  	u16 count;
  	u16 offset;
  };
  
  #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
  /*
   * This structure is to hold information about the device
   * configured to run FCoE protocol stack.
   */
  struct netdev_fcoe_hbainfo {
  	char	manufacturer[64];
  	char	serial_number[64];
  	char	hardware_version[64];
  	char	driver_version[64];
  	char	optionrom_version[64];
  	char	firmware_version[64];
  	char	model[256];
  	char	model_description[256];
  };
  #endif
  
  #define MAX_PHYS_PORT_ID_LEN 32
  
  /* This structure holds a unique identifier to identify the
   * physical port used by a netdevice.
   */
  struct netdev_phys_port_id {
  	unsigned char id[MAX_PHYS_PORT_ID_LEN];
  	unsigned char id_len;
  };
  
  typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
  				       struct sk_buff *skb);
  
  /*
   * This structure defines the management hooks for network devices.
   * The following hooks can be defined; unless noted otherwise, they are
   * optional and can be filled with a null pointer.
   *
   * int (*ndo_init)(struct net_device *dev);
   *     This function is called once when network device is registered.
   *     The network device can use this to any late stage initializaton
   *     or semantic validattion. It can fail with an error code which will
   *     be propogated back to register_netdev
   *
   * void (*ndo_uninit)(struct net_device *dev);
   *     This function is called when device is unregistered or when registration
   *     fails. It is not called if init fails.
   *
   * int (*ndo_open)(struct net_device *dev);
   *     This function is called when network device transistions to the up
   *     state.
   *
   * int (*ndo_stop)(struct net_device *dev);
   *     This function is called when network device transistions to the down
   *     state.
   *
   * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
   *                               struct net_device *dev);
   *	Called when a packet needs to be transmitted.
   *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
   *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
   *	Required can not be NULL.
   *
   * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
   *                         void *accel_priv, select_queue_fallback_t fallback);
   *	Called to decide which queue to when device supports multiple
   *	transmit queues.
   *
   * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
   *	This function is called to allow device receiver to make
   *	changes to configuration when multicast or promiscious is enabled.
   *
   * void (*ndo_set_rx_mode)(struct net_device *dev);
   *	This function is called device changes address list filtering.
   *	If driver handles unicast address filtering, it should set
   *	IFF_UNICAST_FLT to its priv_flags.
   *
   * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
   *	This function  is called when the Media Access Control address
   *	needs to be changed. If this interface is not defined, the
   *	mac address can not be changed.
   *
   * int (*ndo_validate_addr)(struct net_device *dev);
   *	Test if Media Access Control address is valid for the device.
   *
   * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
   *	Called when a user request an ioctl which can't be handled by
   *	the generic interface code. If not defined ioctl's return
   *	not supported error code.
   *
   * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
   *	Used to set network devices bus interface parameters. This interface
   *	is retained for legacy reason, new devices should use the bus
   *	interface (PCI) for low level management.
   *
   * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
   *	Called when a user wants to change the Maximum Transfer Unit
   *	of a device. If not defined, any request to change MTU will
   *	will return an error.
   *
   * void (*ndo_tx_timeout)(struct net_device *dev);
   *	Callback uses when the transmitter has not made any progress
   *	for dev->watchdog ticks.
   *
   * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
   *                      struct rtnl_link_stats64 *storage);
   * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
   *	Called when a user wants to get the network device usage
   *	statistics. Drivers must do one of the following:
   *	1. Define @ndo_get_stats64 to fill in a zero-initialised
   *	   rtnl_link_stats64 structure passed by the caller.
   *	2. Define @ndo_get_stats to update a net_device_stats structure
   *	   (which should normally be dev->stats) and return a pointer to
   *	   it. The structure may be changed asynchronously only if each
   *	   field is written atomically.
   *	3. Update dev->stats asynchronously and atomically, and define
   *	   neither operation.
   *
   * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16t vid);
   *	If device support VLAN filtering this function is called when a
   *	VLAN id is registered.
   *
   * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
   *	If device support VLAN filtering this function is called when a
   *	VLAN id is unregistered.
   *
   * void (*ndo_poll_controller)(struct net_device *dev);
   *
   *	SR-IOV management functions.
   * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
   * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
   * int (*ndo_set_vf_rate)(struct net_device *dev, int vf, int min_tx_rate,
   *			  int max_tx_rate);
   * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
   * int (*ndo_get_vf_config)(struct net_device *dev,
   *			    int vf, struct ifla_vf_info *ivf);
   * int (*ndo_set_vf_link_state)(struct net_device *dev, int vf, int link_state);
   * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
   *			  struct nlattr *port[]);
   * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
   * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
   * 	Called to setup 'tc' number of traffic classes in the net device. This
   * 	is always called from the stack with the rtnl lock held and netif tx
   * 	queues stopped. This allows the netdevice to perform queue management
   * 	safely.
   *
   *	Fiber Channel over Ethernet (FCoE) offload functions.
   * int (*ndo_fcoe_enable)(struct net_device *dev);
   *	Called when the FCoE protocol stack wants to start using LLD for FCoE
   *	so the underlying device can perform whatever needed configuration or
   *	initialization to support acceleration of FCoE traffic.
   *
   * int (*ndo_fcoe_disable)(struct net_device *dev);
   *	Called when the FCoE protocol stack wants to stop using LLD for FCoE
   *	so the underlying device can perform whatever needed clean-ups to
   *	stop supporting acceleration of FCoE traffic.
   *
   * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
   *			     struct scatterlist *sgl, unsigned int sgc);
   *	Called when the FCoE Initiator wants to initialize an I/O that
   *	is a possible candidate for Direct Data Placement (DDP). The LLD can
   *	perform necessary setup and returns 1 to indicate the device is set up
   *	successfully to perform DDP on this I/O, otherwise this returns 0.
   *
   * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
   *	Called when the FCoE Initiator/Target is done with the DDPed I/O as
   *	indicated by the FC exchange id 'xid', so the underlying device can
   *	clean up and reuse resources for later DDP requests.
   *
   * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
   *			      struct scatterlist *sgl, unsigned int sgc);
   *	Called when the FCoE Target wants to initialize an I/O that
   *	is a possible candidate for Direct Data Placement (DDP). The LLD can
   *	perform necessary setup and returns 1 to indicate the device is set up
   *	successfully to perform DDP on this I/O, otherwise this returns 0.
   *
   * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
   *			       struct netdev_fcoe_hbainfo *hbainfo);
   *	Called when the FCoE Protocol stack wants information on the underlying
   *	device. This information is utilized by the FCoE protocol stack to
   *	register attributes with Fiber Channel management service as per the
   *	FC-GS Fabric Device Management Information(FDMI) specification.
   *
   * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
   *	Called when the underlying device wants to override default World Wide
   *	Name (WWN) generation mechanism in FCoE protocol stack to pass its own
   *	World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
   *	protocol stack to use.
   *
   *	RFS acceleration.
   * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
   *			    u16 rxq_index, u32 flow_id);
   *	Set hardware filter for RFS.  rxq_index is the target queue index;
   *	flow_id is a flow ID to be passed to rps_may_expire_flow() later.
   *	Return the filter ID on success, or a negative error code.
   *
   *	Slave management functions (for bridge, bonding, etc).
   * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
   *	Called to make another netdev an underling.
   *
   * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
   *	Called to release previously enslaved netdev.
   *
   *      Feature/offload setting functions.
   * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
   *		netdev_features_t features);
   *	Adjusts the requested feature flags according to device-specific
   *	constraints, and returns the resulting flags. Must not modify
   *	the device state.
   *
   * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
   *	Called to update device configuration to new features. Passed
   *	feature set might be less than what was returned by ndo_fix_features()).
   *	Must return >0 or -errno if it changed dev->features itself.
   *
   * int (*ndo_fdb_add)(struct ndmsg *ndm, struct nlattr *tb[],
   *		      struct net_device *dev,
   *		      const unsigned char *addr, u16 flags)
   *	Adds an FDB entry to dev for addr.
   * int (*ndo_fdb_del)(struct ndmsg *ndm, struct nlattr *tb[],
   *		      struct net_device *dev,
   *		      const unsigned char *addr)
   *	Deletes the FDB entry from dev coresponding to addr.
   * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
   *		       struct net_device *dev, int idx)
   *	Used to add FDB entries to dump requests. Implementers should add
   *	entries to skb and update idx with the number of entries.
   *
   * int (*ndo_bridge_setlink)(struct net_device *dev, struct nlmsghdr *nlh)
   * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
   *			     struct net_device *dev, u32 filter_mask)
   *
   * int (*ndo_change_carrier)(struct net_device *dev, bool new_carrier);
   *	Called to change device carrier. Soft-devices (like dummy, team, etc)
   *	which do not represent real hardware may define this to allow their
   *	userspace components to manage their virtual carrier state. Devices
   *	that determine carrier state from physical hardware properties (eg
   *	network cables) or protocol-dependent mechanisms (eg
   *	USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
   *
   * int (*ndo_get_phys_port_id)(struct net_device *dev,
   *			       struct netdev_phys_port_id *ppid);
   *	Called to get ID of physical port of this device. If driver does
   *	not implement this, it is assumed that the hw is not able to have
   *	multiple net devices on single physical port.
   *
   * void (*ndo_add_vxlan_port)(struct  net_device *dev,
   *			      sa_family_t sa_family, __be16 port);
   *	Called by vxlan to notiy a driver about the UDP port and socket
   *	address family that vxlan is listnening to. It is called only when
   *	a new port starts listening. The operation is protected by the
   *	vxlan_net->sock_lock.
   *
   * void (*ndo_del_vxlan_port)(struct  net_device *dev,
   *			      sa_family_t sa_family, __be16 port);
   *	Called by vxlan to notify the driver about a UDP port and socket
   *	address family that vxlan is not listening to anymore. The operation
   *	is protected by the vxlan_net->sock_lock.
   *
   * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
   *				 struct net_device *dev)
   *	Called by upper layer devices to accelerate switching or other
   *	station functionality into hardware. 'pdev is the lowerdev
   *	to use for the offload and 'dev' is the net device that will
   *	back the offload. Returns a pointer to the private structure
   *	the upper layer will maintain.
   * void (*ndo_dfwd_del_station)(struct net_device *pdev, void *priv)
   *	Called by upper layer device to delete the station created
   *	by 'ndo_dfwd_add_station'. 'pdev' is the net device backing
   *	the station and priv is the structure returned by the add
   *	operation.
   * netdev_tx_t (*ndo_dfwd_start_xmit)(struct sk_buff *skb,
   *				      struct net_device *dev,
   *				      void *priv);
   *	Callback to use for xmit over the accelerated station. This
   *	is used in place of ndo_start_xmit on accelerated net
   *	devices.
   */
  struct net_device_ops {
  	int			(*ndo_init)(struct net_device *dev);
  	void			(*ndo_uninit)(struct net_device *dev);
  	int			(*ndo_open)(struct net_device *dev);
  	int			(*ndo_stop)(struct net_device *dev);
  	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
  						   struct net_device *dev);
  	u16			(*ndo_select_queue)(struct net_device *dev,
  						    struct sk_buff *skb,
  						    void *accel_priv,
  						    select_queue_fallback_t fallback);
  	void			(*ndo_change_rx_flags)(struct net_device *dev,
  						       int flags);
  	void			(*ndo_set_rx_mode)(struct net_device *dev);
  	int			(*ndo_set_mac_address)(struct net_device *dev,
  						       void *addr);
  	int			(*ndo_validate_addr)(struct net_device *dev);
  	int			(*ndo_do_ioctl)(struct net_device *dev,
  					        struct ifreq *ifr, int cmd);
  	int			(*ndo_set_config)(struct net_device *dev,
  					          struct ifmap *map);
  	int			(*ndo_change_mtu)(struct net_device *dev,
  						  int new_mtu);
  	int			(*ndo_neigh_setup)(struct net_device *dev,
  						   struct neigh_parms *);
  	void			(*ndo_tx_timeout) (struct net_device *dev);
  
  	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
  						     struct rtnl_link_stats64 *storage);
  	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
  
  	int			(*ndo_vlan_rx_add_vid)(struct net_device *dev,
  						       __be16 proto, u16 vid);
  	int			(*ndo_vlan_rx_kill_vid)(struct net_device *dev,
  						        __be16 proto, u16 vid);
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	void                    (*ndo_poll_controller)(struct net_device *dev);
  	int			(*ndo_netpoll_setup)(struct net_device *dev,
  						     struct netpoll_info *info);
  	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
  #endif
  #ifdef CONFIG_NET_RX_BUSY_POLL
  	int			(*ndo_busy_poll)(struct napi_struct *dev);
  #endif
  	int			(*ndo_set_vf_mac)(struct net_device *dev,
  						  int queue, u8 *mac);
  	int			(*ndo_set_vf_vlan)(struct net_device *dev,
  						   int queue, u16 vlan, u8 qos);
  	int			(*ndo_set_vf_rate)(struct net_device *dev,
  						   int vf, int min_tx_rate,
  						   int max_tx_rate);
  	int			(*ndo_set_vf_spoofchk)(struct net_device *dev,
  						       int vf, bool setting);
  	int			(*ndo_get_vf_config)(struct net_device *dev,
  						     int vf,
  						     struct ifla_vf_info *ivf);
  	int			(*ndo_set_vf_link_state)(struct net_device *dev,
  							 int vf, int link_state);
  	int			(*ndo_set_vf_port)(struct net_device *dev,
  						   int vf,
  						   struct nlattr *port[]);
  	int			(*ndo_get_vf_port)(struct net_device *dev,
  						   int vf, struct sk_buff *skb);
  	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
  #if IS_ENABLED(CONFIG_FCOE)
  	int			(*ndo_fcoe_enable)(struct net_device *dev);
  	int			(*ndo_fcoe_disable)(struct net_device *dev);
  	int			(*ndo_fcoe_ddp_setup)(struct net_device *dev,
  						      u16 xid,
  						      struct scatterlist *sgl,
  						      unsigned int sgc);
  	int			(*ndo_fcoe_ddp_done)(struct net_device *dev,
  						     u16 xid);
  	int			(*ndo_fcoe_ddp_target)(struct net_device *dev,
  						       u16 xid,
  						       struct scatterlist *sgl,
  						       unsigned int sgc);
  	int			(*ndo_fcoe_get_hbainfo)(struct net_device *dev,
  							struct netdev_fcoe_hbainfo *hbainfo);
  #endif
  
  #if IS_ENABLED(CONFIG_LIBFCOE)
  #define NETDEV_FCOE_WWNN 0
  #define NETDEV_FCOE_WWPN 1
  	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
  						    u64 *wwn, int type);
  #endif
  
  #ifdef CONFIG_RFS_ACCEL
  	int			(*ndo_rx_flow_steer)(struct net_device *dev,
  						     const struct sk_buff *skb,
  						     u16 rxq_index,
  						     u32 flow_id);
  #endif
  	int			(*ndo_add_slave)(struct net_device *dev,
  						 struct net_device *slave_dev);
  	int			(*ndo_del_slave)(struct net_device *dev,
  						 struct net_device *slave_dev);
  	netdev_features_t	(*ndo_fix_features)(struct net_device *dev,
  						    netdev_features_t features);
  	int			(*ndo_set_features)(struct net_device *dev,
  						    netdev_features_t features);
  	int			(*ndo_neigh_construct)(struct neighbour *n);
  	void			(*ndo_neigh_destroy)(struct neighbour *n);
  
  	int			(*ndo_fdb_add)(struct ndmsg *ndm,
  					       struct nlattr *tb[],
  					       struct net_device *dev,
  					       const unsigned char *addr,
  					       u16 flags);
  	int			(*ndo_fdb_del)(struct ndmsg *ndm,
  					       struct nlattr *tb[],
  					       struct net_device *dev,
  					       const unsigned char *addr);
  	int			(*ndo_fdb_dump)(struct sk_buff *skb,
  						struct netlink_callback *cb,
  						struct net_device *dev,
  						int idx);
  
  	int			(*ndo_bridge_setlink)(struct net_device *dev,
  						      struct nlmsghdr *nlh);
  	int			(*ndo_bridge_getlink)(struct sk_buff *skb,
  						      u32 pid, u32 seq,
  						      struct net_device *dev,
  						      u32 filter_mask);
  	int			(*ndo_bridge_dellink)(struct net_device *dev,
  						      struct nlmsghdr *nlh);
  	int			(*ndo_change_carrier)(struct net_device *dev,
  						      bool new_carrier);
  	int			(*ndo_get_phys_port_id)(struct net_device *dev,
  							struct netdev_phys_port_id *ppid);
  	void			(*ndo_add_vxlan_port)(struct  net_device *dev,
  						      sa_family_t sa_family,
  						      __be16 port);
  	void			(*ndo_del_vxlan_port)(struct  net_device *dev,
  						      sa_family_t sa_family,
  						      __be16 port);
  
  	void*			(*ndo_dfwd_add_station)(struct net_device *pdev,
  							struct net_device *dev);
  	void			(*ndo_dfwd_del_station)(struct net_device *pdev,
  							void *priv);
  
  	netdev_tx_t		(*ndo_dfwd_start_xmit) (struct sk_buff *skb,
  							struct net_device *dev,
  							void *priv);
  	int			(*ndo_get_lock_subclass)(struct net_device *dev);
  };
  
  /**
   * enum net_device_priv_flags - &struct net_device priv_flags
   *
   * These are the &struct net_device, they are only set internally
   * by drivers and used in the kernel. These flags are invisible to
   * userspace, this means that the order of these flags can change
   * during any kernel release.
   *
   * You should have a pretty good reason to be extending these flags.
   *
   * @IFF_802_1Q_VLAN: 802.1Q VLAN device
   * @IFF_EBRIDGE: Ethernet bridging device
   * @IFF_SLAVE_INACTIVE: bonding slave not the curr. active
   * @IFF_MASTER_8023AD: bonding master, 802.3ad
   * @IFF_MASTER_ALB: bonding master, balance-alb
   * @IFF_BONDING: bonding master or slave
   * @IFF_SLAVE_NEEDARP: need ARPs for validation
   * @IFF_ISATAP: ISATAP interface (RFC4214)
   * @IFF_MASTER_ARPMON: bonding master, ARP mon in use
   * @IFF_WAN_HDLC: WAN HDLC device
   * @IFF_XMIT_DST_RELEASE: dev_hard_start_xmit() is allowed to
   *	release skb->dst
   * @IFF_DONT_BRIDGE: disallow bridging this ether dev
   * @IFF_DISABLE_NETPOLL: disable netpoll at run-time
   * @IFF_MACVLAN_PORT: device used as macvlan port
   * @IFF_BRIDGE_PORT: device used as bridge port
   * @IFF_OVS_DATAPATH: device used as Open vSwitch datapath port
   * @IFF_TX_SKB_SHARING: The interface supports sharing skbs on transmit
   * @IFF_UNICAST_FLT: Supports unicast filtering
   * @IFF_TEAM_PORT: device used as team port
   * @IFF_SUPP_NOFCS: device supports sending custom FCS
   * @IFF_LIVE_ADDR_CHANGE: device supports hardware address
   *	change when it's running
   * @IFF_MACVLAN: Macvlan device
   */
  enum netdev_priv_flags {
  	IFF_802_1Q_VLAN			= 1<<0,
  	IFF_EBRIDGE			= 1<<1,
  	IFF_SLAVE_INACTIVE		= 1<<2,
  	IFF_MASTER_8023AD		= 1<<3,
  	IFF_MASTER_ALB			= 1<<4,
  	IFF_BONDING			= 1<<5,
  	IFF_SLAVE_NEEDARP		= 1<<6,
  	IFF_ISATAP			= 1<<7,
  	IFF_MASTER_ARPMON		= 1<<8,
  	IFF_WAN_HDLC			= 1<<9,
  	IFF_XMIT_DST_RELEASE		= 1<<10,
  	IFF_DONT_BRIDGE			= 1<<11,
  	IFF_DISABLE_NETPOLL		= 1<<12,
  	IFF_MACVLAN_PORT		= 1<<13,
  	IFF_BRIDGE_PORT			= 1<<14,
  	IFF_OVS_DATAPATH		= 1<<15,
  	IFF_TX_SKB_SHARING		= 1<<16,
  	IFF_UNICAST_FLT			= 1<<17,
  	IFF_TEAM_PORT			= 1<<18,
  	IFF_SUPP_NOFCS			= 1<<19,
  	IFF_LIVE_ADDR_CHANGE		= 1<<20,
  	IFF_MACVLAN			= 1<<21,
  };
  
  #define IFF_802_1Q_VLAN			IFF_802_1Q_VLAN
  #define IFF_EBRIDGE			IFF_EBRIDGE
  #define IFF_SLAVE_INACTIVE		IFF_SLAVE_INACTIVE
  #define IFF_MASTER_8023AD		IFF_MASTER_8023AD
  #define IFF_MASTER_ALB			IFF_MASTER_ALB
  #define IFF_BONDING			IFF_BONDING
  #define IFF_SLAVE_NEEDARP		IFF_SLAVE_NEEDARP
  #define IFF_ISATAP			IFF_ISATAP
  #define IFF_MASTER_ARPMON		IFF_MASTER_ARPMON
  #define IFF_WAN_HDLC			IFF_WAN_HDLC
  #define IFF_XMIT_DST_RELEASE		IFF_XMIT_DST_RELEASE
  #define IFF_DONT_BRIDGE			IFF_DONT_BRIDGE
  #define IFF_DISABLE_NETPOLL		IFF_DISABLE_NETPOLL
  #define IFF_MACVLAN_PORT		IFF_MACVLAN_PORT
  #define IFF_BRIDGE_PORT			IFF_BRIDGE_PORT
  #define IFF_OVS_DATAPATH		IFF_OVS_DATAPATH
  #define IFF_TX_SKB_SHARING		IFF_TX_SKB_SHARING
  #define IFF_UNICAST_FLT			IFF_UNICAST_FLT
  #define IFF_TEAM_PORT			IFF_TEAM_PORT
  #define IFF_SUPP_NOFCS			IFF_SUPP_NOFCS
  #define IFF_LIVE_ADDR_CHANGE		IFF_LIVE_ADDR_CHANGE
  #define IFF_MACVLAN			IFF_MACVLAN
  
  /*
   *	The DEVICE structure.
   *	Actually, this whole structure is a big mistake.  It mixes I/O
   *	data with strictly "high-level" data, and it has to know about
   *	almost every data structure used in the INET module.
   *
   *	FIXME: cleanup struct net_device such that network protocol info
   *	moves out.
   */
  
  struct net_device {
  
  	/*
  	 * This is the first field of the "visible" part of this structure
  	 * (i.e. as seen by users in the "Space.c" file).  It is the name
  	 * of the interface.
  	 */
  	char			name[IFNAMSIZ];
  
  	/* device name hash chain, please keep it close to name[] */
  	struct hlist_node	name_hlist;
  
  	/* snmp alias */
  	char 			*ifalias;
  
  	/*
  	 *	I/O specific fields
  	 *	FIXME: Merge these and struct ifmap into one
  	 */
  	unsigned long		mem_end;	/* shared mem end	*/
  	unsigned long		mem_start;	/* shared mem start	*/
  	unsigned long		base_addr;	/* device I/O address	*/
  	int			irq;		/* device IRQ number	*/
  
  	/*
  	 *	Some hardware also needs these fields, but they are not
  	 *	part of the usual set specified in Space.c.
  	 */
  
  	unsigned long		state;
  
  	struct list_head	dev_list;
  	struct list_head	napi_list;
  	struct list_head	unreg_list;
  	struct list_head	close_list;
  
  	/* directly linked devices, like slaves for bonding */
  	struct {
  		struct list_head upper;
  		struct list_head lower;
  	} adj_list;
  
  	/* all linked devices, *including* neighbours */
  	struct {
  		struct list_head upper;
  		struct list_head lower;
  	} all_adj_list;
  
  
  	/* currently active device features */
  	netdev_features_t	features;
  	/* user-changeable features */
  	netdev_features_t	hw_features;
  	/* user-requested features */
  	netdev_features_t	wanted_features;
  	/* mask of features inheritable by VLAN devices */
  	netdev_features_t	vlan_features;
  	/* mask of features inherited by encapsulating devices
  	 * This field indicates what encapsulation offloads
  	 * the hardware is capable of doing, and drivers will
  	 * need to set them appropriately.
  	 */
  	netdev_features_t	hw_enc_features;
  	/* mask of fetures inheritable by MPLS */
  	netdev_features_t	mpls_features;
  
  	/* Interface index. Unique device identifier	*/
  	int			ifindex;
  	int			iflink;
  
  	struct net_device_stats	stats;
  
  	/* dropped packets by core network, Do not use this in drivers */
  	atomic_long_t		rx_dropped;
  	atomic_long_t		tx_dropped;
  
  	/* Stats to monitor carrier on<->off transitions */
  	atomic_t		carrier_changes;
  
  #ifdef CONFIG_WIRELESS_EXT
  	/* List of functions to handle Wireless Extensions (instead of ioctl).
  	 * See <net/iw_handler.h> for details. Jean II */
  	const struct iw_handler_def *	wireless_handlers;
  	/* Instance data managed by the core of Wireless Extensions. */
  	struct iw_public_data *	wireless_data;
  #endif
  	/* Management operations */
  	const struct net_device_ops *netdev_ops;
  	const struct ethtool_ops *ethtool_ops;
  	const struct forwarding_accel_ops *fwd_ops;
  
  	/* Hardware header description */
  	const struct header_ops *header_ops;
  
  	unsigned int		flags;	/* interface flags (a la BSD)	*/
  	unsigned int		priv_flags; /* Like 'flags' but invisible to userspace.
  					     * See if.h for definitions. */
  	unsigned short		gflags;
  	unsigned short		padded;	/* How much padding added by alloc_netdev() */
  
  	unsigned char		operstate; /* RFC2863 operstate */
  	unsigned char		link_mode; /* mapping policy to operstate */
  
  	unsigned char		if_port;	/* Selectable AUI, TP,..*/
  	unsigned char		dma;		/* DMA channel		*/
  
  	unsigned int		mtu;	/* interface MTU value		*/
  	unsigned short		type;	/* interface hardware type	*/
  	unsigned short		hard_header_len;	/* hardware hdr length	*/
  
  	/* extra head- and tailroom the hardware may need, but not in all cases
  	 * can this be guaranteed, especially tailroom. Some cases also use
  	 * LL_MAX_HEADER instead to allocate the skb.
  	 */
  	unsigned short		needed_headroom;
  	unsigned short		needed_tailroom;
  
  	/* Interface address info. */
  	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
  	unsigned char		addr_assign_type; /* hw address assignment type */
  	unsigned char		addr_len;	/* hardware address length	*/
  	unsigned short		neigh_priv_len;
  	unsigned short          dev_id;		/* Used to differentiate devices
  						 * that share the same link
  						 * layer address
  						 */
  	unsigned short          dev_port;	/* Used to differentiate
  						 * devices that share the same
  						 * function
  						 */
  	spinlock_t		addr_list_lock;
  	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
  	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
  	struct netdev_hw_addr_list	dev_addrs; /* list of device
  						    * hw addresses
  						    */
  #ifdef CONFIG_SYSFS
  	struct kset		*queues_kset;
  #endif
  
  	bool			uc_promisc;
  	unsigned int		promiscuity;
  	unsigned int		allmulti;
  
  
  	/* Protocol specific pointers */
  
  #if IS_ENABLED(CONFIG_VLAN_8021Q)
  	struct vlan_info __rcu	*vlan_info;	/* VLAN info */
  #endif
  #if IS_ENABLED(CONFIG_NET_DSA)
  	struct dsa_switch_tree	*dsa_ptr;	/* dsa specific data */
  #endif
  #if IS_ENABLED(CONFIG_TIPC)
  	struct tipc_bearer __rcu *tipc_ptr;	/* TIPC specific data */
  #endif
  	void 			*atalk_ptr;	/* AppleTalk link 	*/
  	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
  	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
  	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
  	void			*ax25_ptr;	/* AX.25 specific data */
  	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
  						   assign before registering */
  
  /*
   * Cache lines mostly used on receive path (including eth_type_trans())
   */
  	unsigned long		last_rx;	/* Time of last Rx */
  
  	/* Interface address info used in eth_type_trans() */
  	unsigned char		*dev_addr;	/* hw address, (before bcast
  						   because most packets are
  						   unicast) */
  
  
  #ifdef CONFIG_SYSFS
  	struct netdev_rx_queue	*_rx;
  
  	/* Number of RX queues allocated at register_netdev() time */
  	unsigned int		num_rx_queues;
  
  	/* Number of RX queues currently active in device */
  	unsigned int		real_num_rx_queues;
  
  #endif
  
  	rx_handler_func_t __rcu	*rx_handler;
  	void __rcu		*rx_handler_data;
  
  	struct netdev_queue __rcu *ingress_queue;
  	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
  
  
  /*
   * Cache lines mostly used on transmit path
   */
  	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
  
  	/* Number of TX queues allocated at alloc_netdev_mq() time  */
  	unsigned int		num_tx_queues;
  
  	/* Number of TX queues currently active in device  */
  	unsigned int		real_num_tx_queues;
  
  	/* root qdisc from userspace point of view */
  	struct Qdisc		*qdisc;
  
  	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
  	spinlock_t		tx_global_lock;
  
  #ifdef CONFIG_XPS
  	struct xps_dev_maps __rcu *xps_maps;
  #endif
  #ifdef CONFIG_RFS_ACCEL
  	/* CPU reverse-mapping for RX completion interrupts, indexed
  	 * by RX queue number.  Assigned by driver.  This must only be
  	 * set if the ndo_rx_flow_steer operation is defined. */
  	struct cpu_rmap		*rx_cpu_rmap;
  #endif
  
  	/* These may be needed for future network-power-down code. */
  
  	/*
  	 * trans_start here is expensive for high speed devices on SMP,
  	 * please use netdev_queue->trans_start instead.
  	 */
  	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/
  
  	int			watchdog_timeo; /* used by dev_watchdog() */
  	struct timer_list	watchdog_timer;
  
  	/* Number of references to this device */
  	int __percpu		*pcpu_refcnt;
  
  	/* delayed register/unregister */
  	struct list_head	todo_list;
  	/* device index hash chain */
  	struct hlist_node	index_hlist;
  
  	struct list_head	link_watch_list;
  
  	/* register/unregister state machine */
  	enum { NETREG_UNINITIALIZED=0,
  	       NETREG_REGISTERED,	/* completed register_netdevice */
  	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
  	       NETREG_UNREGISTERED,	/* completed unregister todo */
  	       NETREG_RELEASED,		/* called free_netdev */
  	       NETREG_DUMMY,		/* dummy device for NAPI poll */
  	} reg_state:8;
  
  	bool dismantle; /* device is going do be freed */
  
  	enum {
  		RTNL_LINK_INITIALIZED,
  		RTNL_LINK_INITIALIZING,
  	} rtnl_link_state:16;
  
  	/* Called from unregister, can be used to call free_netdev */
  	void (*destructor)(struct net_device *dev);
  
  #ifdef CONFIG_NETPOLL
  	struct netpoll_info __rcu	*npinfo;
  #endif
  
  #ifdef CONFIG_NET_NS
  	/* Network namespace this network device is inside */
  	struct net		*nd_net;
  #endif
  
  	/* mid-layer private */
  	union {
  		void				*ml_priv;
  		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
  		struct pcpu_sw_netstats __percpu	*tstats;
  		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
  		struct pcpu_vstats __percpu	*vstats; /* veth stats */
  	};
  	/* GARP */
  	struct garp_port __rcu	*garp_port;
  	/* MRP */
  	struct mrp_port __rcu	*mrp_port;
  
  	/* class/net/name entry */
  	struct device		dev;
  	/* space for optional device, statistics, and wireless sysfs groups */
  	const struct attribute_group *sysfs_groups[4];
  	/* space for optional per-rx queue attributes */
  	const struct attribute_group *sysfs_rx_queue_group;
  
  	/* rtnetlink link ops */
  	const struct rtnl_link_ops *rtnl_link_ops;
  
  	/* for setting kernel sock attribute on TCP connection setup */
  #define GSO_MAX_SIZE		65536
  	unsigned int		gso_max_size;
  #define GSO_MAX_SEGS		65535
  	u16			gso_max_segs;
  
  #ifdef CONFIG_DCB
  	/* Data Center Bridging netlink ops */
  	const struct dcbnl_rtnl_ops *dcbnl_ops;
  #endif
  	u8 num_tc;
  	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
  	u8 prio_tc_map[TC_BITMASK + 1];
  
  #if IS_ENABLED(CONFIG_FCOE)
  	/* max exchange id for FCoE LRO by ddp */
  	unsigned int		fcoe_ddp_xid;
  #endif
  #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
  	struct netprio_map __rcu *priomap;
  #endif
  	/* phy device may attach itself for hardware timestamping */
  	struct phy_device *phydev;
  
  	struct lock_class_key *qdisc_tx_busylock;
  
  	/* group the device belongs to */
  	int group;
  
  	struct pm_qos_request	pm_qos_req;
  };
  #define to_net_dev(d) container_of(d, struct net_device, dev)
  
  #define	NETDEV_ALIGN		32
  
  static inline
  int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
  {
  	return dev->prio_tc_map[prio & TC_BITMASK];
  }
  
  static inline
  int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
  {
  	if (tc >= dev->num_tc)
  		return -EINVAL;
  
  	dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
  	return 0;
  }
  
  static inline
  void netdev_reset_tc(struct net_device *dev)
  {
  	dev->num_tc = 0;
  	memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
  	memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
  }
  
  static inline
  int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
  {
  	if (tc >= dev->num_tc)
  		return -EINVAL;
  
  	dev->tc_to_txq[tc].count = count;
  	dev->tc_to_txq[tc].offset = offset;
  	return 0;
  }
  
  static inline
  int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
  {
  	if (num_tc > TC_MAX_QUEUE)
  		return -EINVAL;
  
  	dev->num_tc = num_tc;
  	return 0;
  }
  
  static inline
  int netdev_get_num_tc(struct net_device *dev)
  {
  	return dev->num_tc;
  }
  
  static inline
  struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
  					 unsigned int index)
  {
  	return &dev->_tx[index];
  }
  
  static inline void netdev_for_each_tx_queue(struct net_device *dev,
  					    void (*f)(struct net_device *,
  						      struct netdev_queue *,
  						      void *),
  					    void *arg)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++)
  		f(dev, &dev->_tx[i], arg);
  }
  
  struct netdev_queue *netdev_pick_tx(struct net_device *dev,
  				    struct sk_buff *skb,
  				    void *accel_priv);
  
  /*
   * Net namespace inlines
   */
  static inline
  struct net *dev_net(const struct net_device *dev)
  {
  	return read_pnet(&dev->nd_net);
  }
  
  static inline
  void dev_net_set(struct net_device *dev, struct net *net)
  {
  #ifdef CONFIG_NET_NS
  	release_net(dev->nd_net);
  	dev->nd_net = hold_net(net);
  #endif
  }
  
  static inline bool netdev_uses_dsa_tags(struct net_device *dev)
  {
  #ifdef CONFIG_NET_DSA_TAG_DSA
  	if (dev->dsa_ptr != NULL)
  		return dsa_uses_dsa_tags(dev->dsa_ptr);
  #endif
  
  	return 0;
  }
  
  static inline bool netdev_uses_trailer_tags(struct net_device *dev)
  {
  #ifdef CONFIG_NET_DSA_TAG_TRAILER
  	if (dev->dsa_ptr != NULL)
  		return dsa_uses_trailer_tags(dev->dsa_ptr);
  #endif
  
  	return 0;
  }
  
  /**
   *	netdev_priv - access network device private data
   *	@dev: network device
   *
   * Get network device private data
   */
  static inline void *netdev_priv(const struct net_device *dev)
  {
  	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
  }
  
  /* Set the sysfs physical device reference for the network logical device
   * if set prior to registration will cause a symlink during initialization.
   */
  #define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
  
  /* Set the sysfs device type for the network logical device to allow
   * fine-grained identification of different network device types. For
   * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
   */
  #define SET_NETDEV_DEVTYPE(net, devtype)	((net)->dev.type = (devtype))
  
  /* Default NAPI poll() weight
   * Device drivers are strongly advised to not use bigger value
   */
  #define NAPI_POLL_WEIGHT 64
  
  /**
   *	netif_napi_add - initialize a napi context
   *	@dev:  network device
   *	@napi: napi context
   *	@poll: polling function
   *	@weight: default weight
   *
   * netif_napi_add() must be used to initialize a napi context prior to calling
   * *any* of the other napi related functions.
   */
  void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
  		    int (*poll)(struct napi_struct *, int), int weight);
  
  /**
   *  netif_napi_del - remove a napi context
   *  @napi: napi context
   *
   *  netif_napi_del() removes a napi context from the network device napi list
   */
  void netif_napi_del(struct napi_struct *napi);
  
  struct napi_gro_cb {
  	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
  	void *frag0;
  
  	/* Length of frag0. */
  	unsigned int frag0_len;
  
  	/* This indicates where we are processing relative to skb->data. */
  	int data_offset;
  
  	/* This is non-zero if the packet cannot be merged with the new skb. */
  	u16	flush;
  
  	/* Save the IP ID here and check when we get to the transport layer */
  	u16	flush_id;
  
  	/* Number of segments aggregated. */
  	u16	count;
  
  	/* This is non-zero if the packet may be of the same flow. */
  	u8	same_flow;
  
  	/* Free the skb? */
  	u8	free;
  #define NAPI_GRO_FREE		  1
  #define NAPI_GRO_FREE_STOLEN_HEAD 2
  
  	/* jiffies when first packet was created/queued */
  	unsigned long age;
  
  	/* Used in ipv6_gro_receive() */
  	u16	proto;
  
  	/* Used in udp_gro_receive */
  	u16	udp_mark;
  
  	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
  	__wsum	csum;
  
  	/* used in skb_gro_receive() slow path */
  	struct sk_buff *last;
  };
  
  #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
  
  struct packet_type {
  	__be16			type;	/* This is really htons(ether_type). */
  	struct net_device	*dev;	/* NULL is wildcarded here	     */
  	int			(*func) (struct sk_buff *,
  					 struct net_device *,
  					 struct packet_type *,
  					 struct net_device *);
  	bool			(*id_match)(struct packet_type *ptype,
  					    struct sock *sk);
  	void			*af_packet_priv;
  	struct list_head	list;
  };
  
  struct offload_callbacks {
  	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
  						netdev_features_t features);
  	int			(*gso_send_check)(struct sk_buff *skb);
  	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
  					       struct sk_buff *skb);
  	int			(*gro_complete)(struct sk_buff *skb, int nhoff);
  };
  
  struct packet_offload {
  	__be16			 type;	/* This is really htons(ether_type). */
  	struct offload_callbacks callbacks;
  	struct list_head	 list;
  };
  
  struct udp_offload {
  	__be16			 port;
  	struct offload_callbacks callbacks;
  };
  
  /* often modified stats are per cpu, other are shared (netdev->stats) */
  struct pcpu_sw_netstats {
  	u64     rx_packets;
  	u64     rx_bytes;
  	u64     tx_packets;
  	u64     tx_bytes;
  	struct u64_stats_sync   syncp;
  };
  
  #define netdev_alloc_pcpu_stats(type)				\
  ({								\
  	typeof(type) __percpu *pcpu_stats = alloc_percpu(type); \
  	if (pcpu_stats)	{					\
  		int i;						\
  		for_each_possible_cpu(i) {			\
  			typeof(type) *stat;			\
  			stat = per_cpu_ptr(pcpu_stats, i);	\
  			u64_stats_init(&stat->syncp);		\
  		}						\
  	}							\
  	pcpu_stats;						\
  })
  
  #include <linux/notifier.h>
  
  /* netdevice notifier chain. Please remember to update the rtnetlink
   * notification exclusion list in rtnetlink_event() when adding new
   * types.
   */
  #define NETDEV_UP	0x0001	/* For now you can't veto a device up/down */
  #define NETDEV_DOWN	0x0002
  #define NETDEV_REBOOT	0x0003	/* Tell a protocol stack a network interface
  				   detected a hardware crash and restarted
  				   - we can use this eg to kick tcp sessions
  				   once done */
  #define NETDEV_CHANGE	0x0004	/* Notify device state change */
  #define NETDEV_REGISTER 0x0005
  #define NETDEV_UNREGISTER	0x0006
  #define NETDEV_CHANGEMTU	0x0007 /* notify after mtu change happened */
  #define NETDEV_CHANGEADDR	0x0008
  #define NETDEV_GOING_DOWN	0x0009
  #define NETDEV_CHANGENAME	0x000A
  #define NETDEV_FEAT_CHANGE	0x000B
  #define NETDEV_BONDING_FAILOVER 0x000C
  #define NETDEV_PRE_UP		0x000D
  #define NETDEV_PRE_TYPE_CHANGE	0x000E
  #define NETDEV_POST_TYPE_CHANGE	0x000F
  #define NETDEV_POST_INIT	0x0010
  #define NETDEV_UNREGISTER_FINAL 0x0011
  #define NETDEV_RELEASE		0x0012
  #define NETDEV_NOTIFY_PEERS	0x0013
  #define NETDEV_JOIN		0x0014
  #define NETDEV_CHANGEUPPER	0x0015
  #define NETDEV_RESEND_IGMP	0x0016
  #define NETDEV_PRECHANGEMTU	0x0017 /* notify before mtu change happened */
  
  int register_netdevice_notifier(struct notifier_block *nb);
  int unregister_netdevice_notifier(struct notifier_block *nb);
  
  struct netdev_notifier_info {
  	struct net_device *dev;
  };
  
  struct netdev_notifier_change_info {
  	struct netdev_notifier_info info; /* must be first */
  	unsigned int flags_changed;
  };
  
  static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
  					     struct net_device *dev)
  {
  	info->dev = dev;
  }
  
  static inline struct net_device *
  netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
  {
  	return info->dev;
  }
  
  int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
  
  
  extern rwlock_t				dev_base_lock;		/* Device list lock */
  
  #define for_each_netdev(net, d)		\
  		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_reverse(net, d)	\
  		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_rcu(net, d)		\
  		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_safe(net, d, n)	\
  		list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_continue(net, d)		\
  		list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_continue_rcu(net, d)		\
  	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
  #define for_each_netdev_in_bond_rcu(bond, slave)	\
  		for_each_netdev_rcu(&init_net, slave)	\
  			if (netdev_master_upper_dev_get_rcu(slave) == bond)
  #define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
  
  static inline struct net_device *next_net_device(struct net_device *dev)
  {
  	struct list_head *lh;
  	struct net *net;
  
  	net = dev_net(dev);
  	lh = dev->dev_list.next;
  	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  }
  
  static inline struct net_device *next_net_device_rcu(struct net_device *dev)
  {
  	struct list_head *lh;
  	struct net *net;
  
  	net = dev_net(dev);
  	lh = rcu_dereference(list_next_rcu(&dev->dev_list));
  	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  }
  
  static inline struct net_device *first_net_device(struct net *net)
  {
  	return list_empty(&net->dev_base_head) ? NULL :
  		net_device_entry(net->dev_base_head.next);
  }
  
  static inline struct net_device *first_net_device_rcu(struct net *net)
  {
  	struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
  
  	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  }
  
  int netdev_boot_setup_check(struct net_device *dev);
  unsigned long netdev_boot_base(const char *prefix, int unit);
  struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
  				       const char *hwaddr);
  struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
  struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
  void dev_add_pack(struct packet_type *pt);
  void dev_remove_pack(struct packet_type *pt);
  void __dev_remove_pack(struct packet_type *pt);
  void dev_add_offload(struct packet_offload *po);
  void dev_remove_offload(struct packet_offload *po);
  
  struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
  					unsigned short mask);
  struct net_device *dev_get_by_name(struct net *net, const char *name);
  struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
  struct net_device *__dev_get_by_name(struct net *net, const char *name);
  int dev_alloc_name(struct net_device *dev, const char *name);
  int dev_open(struct net_device *dev);
  int dev_close(struct net_device *dev);
  void dev_disable_lro(struct net_device *dev);
  int dev_loopback_xmit(struct sk_buff *newskb);
  int dev_queue_xmit(struct sk_buff *skb);
  int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv);
  int register_netdevice(struct net_device *dev);
  void unregister_netdevice_queue(struct net_device *dev, struct list_head *head);
  void unregister_netdevice_many(struct list_head *head);
  static inline void unregister_netdevice(struct net_device *dev)
  {
  	unregister_netdevice_queue(dev, NULL);
  }
  
  int netdev_refcnt_read(const struct net_device *dev);
  void free_netdev(struct net_device *dev);
  void netdev_freemem(struct net_device *dev);
  void synchronize_net(void);
  int init_dummy_netdev(struct net_device *dev);
  
  struct net_device *dev_get_by_index(struct net *net, int ifindex);
  struct net_device *__dev_get_by_index(struct net *net, int ifindex);
  struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
  int netdev_get_name(struct net *net, char *name, int ifindex);
  int dev_restart(struct net_device *dev);
  int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb);
  
  static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
  {
  	return NAPI_GRO_CB(skb)->data_offset;
  }
  
  static inline unsigned int skb_gro_len(const struct sk_buff *skb)
  {
  	return skb->len - NAPI_GRO_CB(skb)->data_offset;
  }
  
  static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
  {
  	NAPI_GRO_CB(skb)->data_offset += len;
  }
  
  static inline void *skb_gro_header_fast(struct sk_buff *skb,
  					unsigned int offset)
  {
  	return NAPI_GRO_CB(skb)->frag0 + offset;
  }
  
  static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
  {
  	return NAPI_GRO_CB(skb)->frag0_len < hlen;
  }
  
  static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
  					unsigned int offset)
  {
  	if (!pskb_may_pull(skb, hlen))
  		return NULL;
  
  	NAPI_GRO_CB(skb)->frag0 = NULL;
  	NAPI_GRO_CB(skb)->frag0_len = 0;
  	return skb->data + offset;
  }
  
  static inline void *skb_gro_network_header(struct sk_buff *skb)
  {
  	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
  	       skb_network_offset(skb);
  }
  
  static inline void skb_gro_postpull_rcsum(struct sk_buff *skb,
  					const void *start, unsigned int len)
  {
  	if (skb->ip_summed == CHECKSUM_COMPLETE)
  		NAPI_GRO_CB(skb)->csum = csum_sub(NAPI_GRO_CB(skb)->csum,
  						  csum_partial(start, len, 0));
  }
  
  static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  				  unsigned short type,
  				  const void *daddr, const void *saddr,
  				  unsigned int len)
  {
  	if (!dev->header_ops || !dev->header_ops->create)
  		return 0;
  
  	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
  }
  
  static inline int dev_parse_header(const struct sk_buff *skb,
  				   unsigned char *haddr)
  {
  	const struct net_device *dev = skb->dev;
  
  	if (!dev->header_ops || !dev->header_ops->parse)
  		return 0;
  	return dev->header_ops->parse(skb, haddr);
  }
  
  static inline int dev_rebuild_header(struct sk_buff *skb)
  {
  	const struct net_device *dev = skb->dev;
  
  	if (!dev->header_ops || !dev->header_ops->rebuild)
  		return 0;
  	return dev->header_ops->rebuild(skb);
  }
  
  typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
  int register_gifconf(unsigned int family, gifconf_func_t *gifconf);
  static inline int unregister_gifconf(unsigned int family)
  {
  	return register_gifconf(family, NULL);
  }
  
  #ifdef CONFIG_NET_FLOW_LIMIT
  #define FLOW_LIMIT_HISTORY	(1 << 7)  /* must be ^2 and !overflow buckets */
  struct sd_flow_limit {
  	u64			count;
  	unsigned int		num_buckets;
  	unsigned int		history_head;
  	u16			history[FLOW_LIMIT_HISTORY];
  	u8			buckets[];
  };
  
  extern int netdev_flow_limit_table_len;
  #endif /* CONFIG_NET_FLOW_LIMIT */
  
  /*
   * Incoming packets are placed on per-cpu queues
   */
  struct softnet_data {
  	struct Qdisc		*output_queue;
  	struct Qdisc		**output_queue_tailp;
  	struct list_head	poll_list;
  	struct sk_buff		*completion_queue;
  	struct sk_buff_head	process_queue;
  
  	/* stats */
  	unsigned int		processed;
  	unsigned int		time_squeeze;
  	unsigned int		cpu_collision;
  	unsigned int		received_rps;
  
  #ifdef CONFIG_RPS
  	struct softnet_data	*rps_ipi_list;
  
  	/* Elements below can be accessed between CPUs for RPS */
  	struct call_single_data	csd ____cacheline_aligned_in_smp;
  	struct softnet_data	*rps_ipi_next;
  	unsigned int		cpu;
  	unsigned int		input_queue_head;
  	unsigned int		input_queue_tail;
  #endif
  	unsigned int		dropped;
  	struct sk_buff_head	input_pkt_queue;
  	struct napi_struct	backlog;
  
  #ifdef CONFIG_NET_FLOW_LIMIT
  	struct sd_flow_limit __rcu *flow_limit;
  #endif
  };
  
  static inline void input_queue_head_incr(struct softnet_data *sd)
  {
  #ifdef CONFIG_RPS
  	sd->input_queue_head++;
  #endif
  }
  
  static inline void input_queue_tail_incr_save(struct softnet_data *sd,
  					      unsigned int *qtail)
  {
  #ifdef CONFIG_RPS
  	*qtail = ++sd->input_queue_tail;
  #endif
  }
  
  DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
  
  void __netif_schedule(struct Qdisc *q);
  
  static inline void netif_schedule_queue(struct netdev_queue *txq)
  {
  	if (!(txq->state & QUEUE_STATE_ANY_XOFF))
  		__netif_schedule(txq->qdisc);
  }
  
  static inline void netif_tx_schedule_all(struct net_device *dev)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++)
  		netif_schedule_queue(netdev_get_tx_queue(dev, i));
  }
  
  static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
  {
  	clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  }
  
  /**
   *	netif_start_queue - allow transmit
   *	@dev: network device
   *
   *	Allow upper layers to call the device hard_start_xmit routine.
   */
  static inline void netif_start_queue(struct net_device *dev)
  {
  	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
  }
  
  static inline void netif_tx_start_all_queues(struct net_device *dev)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  		netif_tx_start_queue(txq);
  	}
  }
  
  static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
  {
  	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
  		__netif_schedule(dev_queue->qdisc);
  }
  
  /**
   *	netif_wake_queue - restart transmit
   *	@dev: network device
   *
   *	Allow upper layers to call the device hard_start_xmit routine.
   *	Used for flow control when transmit resources are available.
   */
  static inline void netif_wake_queue(struct net_device *dev)
  {
  	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
  }
  
  static inline void netif_tx_wake_all_queues(struct net_device *dev)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  		netif_tx_wake_queue(txq);
  	}
  }
  
  static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
  {
  	if (WARN_ON(!dev_queue)) {
  		pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
  		return;
  	}
  	set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  }
  
  /**
   *	netif_stop_queue - stop transmitted packets
   *	@dev: network device
   *
   *	Stop upper layers calling the device hard_start_xmit routine.
   *	Used for flow control when transmit resources are unavailable.
   */
  static inline void netif_stop_queue(struct net_device *dev)
  {
  	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
  }
  
  static inline void netif_tx_stop_all_queues(struct net_device *dev)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  		netif_tx_stop_queue(txq);
  	}
  }
  
  static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
  {
  	return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  }
  
  /**
   *	netif_queue_stopped - test if transmit queue is flowblocked
   *	@dev: network device
   *
   *	Test if transmit queue on device is currently unable to send.
   */
  static inline bool netif_queue_stopped(const struct net_device *dev)
  {
  	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
  }
  
  static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
  {
  	return dev_queue->state & QUEUE_STATE_ANY_XOFF;
  }
  
  static inline bool
  netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
  {
  	return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
  }
  
  static inline bool
  netif_xmit_frozen_or_drv_stopped(const struct netdev_queue *dev_queue)
  {
  	return dev_queue->state & QUEUE_STATE_DRV_XOFF_OR_FROZEN;
  }
  
  static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
  					unsigned int bytes)
  {
  #ifdef CONFIG_BQL
  	dql_queued(&dev_queue->dql, bytes);
  
  	if (likely(dql_avail(&dev_queue->dql) >= 0))
  		return;
  
  	set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
  
  	/*
  	 * The XOFF flag must be set before checking the dql_avail below,
  	 * because in netdev_tx_completed_queue we update the dql_completed
  	 * before checking the XOFF flag.
  	 */
  	smp_mb();
  
  	/* check again in case another CPU has just made room avail */
  	if (unlikely(dql_avail(&dev_queue->dql) >= 0))
  		clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
  #endif
  }
  
  /**
   * 	netdev_sent_queue - report the number of bytes queued to hardware
   * 	@dev: network device
   * 	@bytes: number of bytes queued to the hardware device queue
   *
   * 	Report the number of bytes queued for sending/completion to the network
   * 	device hardware queue. @bytes should be a good approximation and should
   * 	exactly match netdev_completed_queue() @bytes
   */
  static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
  {
  	netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
  }
  
  static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
  					     unsigned int pkts, unsigned int bytes)
  {
  #ifdef CONFIG_BQL
  	if (unlikely(!bytes))
  		return;
  
  	dql_completed(&dev_queue->dql, bytes);
  
  	/*
  	 * Without the memory barrier there is a small possiblity that
  	 * netdev_tx_sent_queue will miss the update and cause the queue to
  	 * be stopped forever
  	 */
  	smp_mb();
  
  	if (dql_avail(&dev_queue->dql) < 0)
  		return;
  
  	if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
  		netif_schedule_queue(dev_queue);
  #endif
  }
  
  /**
   * 	netdev_completed_queue - report bytes and packets completed by device
   * 	@dev: network device
   * 	@pkts: actual number of packets sent over the medium
   * 	@bytes: actual number of bytes sent over the medium
   *
   * 	Report the number of bytes and packets transmitted by the network device
   * 	hardware queue over the physical medium, @bytes must exactly match the
   * 	@bytes amount passed to netdev_sent_queue()
   */
  static inline void netdev_completed_queue(struct net_device *dev,
  					  unsigned int pkts, unsigned int bytes)
  {
  	netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
  }
  
  static inline void netdev_tx_reset_queue(struct netdev_queue *q)
  {
  #ifdef CONFIG_BQL
  	clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
  	dql_reset(&q->dql);
  #endif
  }
  
  /**
   * 	netdev_reset_queue - reset the packets and bytes count of a network device
   * 	@dev_queue: network device
   *
   * 	Reset the bytes and packet count of a network device and clear the
   * 	software flow control OFF bit for this network device
   */
  static inline void netdev_reset_queue(struct net_device *dev_queue)
  {
  	netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
  }
  
  /**
   * 	netdev_cap_txqueue - check if selected tx queue exceeds device queues
   * 	@dev: network device
   * 	@queue_index: given tx queue index
   *
   * 	Returns 0 if given tx queue index >= number of device tx queues,
   * 	otherwise returns the originally passed tx queue index.
   */
  static inline u16 netdev_cap_txqueue(struct net_device *dev, u16 queue_index)
  {
  	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
  		net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
  				     dev->name, queue_index,
  				     dev->real_num_tx_queues);
  		return 0;
  	}
  
  	return queue_index;
  }
  
  /**
   *	netif_running - test if up
   *	@dev: network device
   *
   *	Test if the device has been brought up.
   */
  static inline bool netif_running(const struct net_device *dev)
  {
  	return test_bit(__LINK_STATE_START, &dev->state);
  }
  
  /*
   * Routines to manage the subqueues on a device.  We only need start
   * stop, and a check if it's stopped.  All other device management is
   * done at the overall netdevice level.
   * Also test the device if we're multiqueue.
   */
  
  /**
   *	netif_start_subqueue - allow sending packets on subqueue
   *	@dev: network device
   *	@queue_index: sub queue index
   *
   * Start individual transmit queue of a device with multiple transmit queues.
   */
  static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
  {
  	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  
  	netif_tx_start_queue(txq);
  }
  
  /**
   *	netif_stop_subqueue - stop sending packets on subqueue
   *	@dev: network device
   *	@queue_index: sub queue index
   *
   * Stop individual transmit queue of a device with multiple transmit queues.
   */
  static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
  {
  	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  	netif_tx_stop_queue(txq);
  }
  
  /**
   *	netif_subqueue_stopped - test status of subqueue
   *	@dev: network device
   *	@queue_index: sub queue index
   *
   * Check individual transmit queue of a device with multiple transmit queues.
   */
  static inline bool __netif_subqueue_stopped(const struct net_device *dev,
  					    u16 queue_index)
  {
  	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  
  	return netif_tx_queue_stopped(txq);
  }
  
  static inline bool netif_subqueue_stopped(const struct net_device *dev,
  					  struct sk_buff *skb)
  {
  	return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
  }
  
  /**
   *	netif_wake_subqueue - allow sending packets on subqueue
   *	@dev: network device
   *	@queue_index: sub queue index
   *
   * Resume individual transmit queue of a device with multiple transmit queues.
   */
  static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
  {
  	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  	if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
  		__netif_schedule(txq->qdisc);
  }
  
  #ifdef CONFIG_XPS
  int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
  			u16 index);
  #else
  static inline int netif_set_xps_queue(struct net_device *dev,
  				      const struct cpumask *mask,
  				      u16 index)
  {
  	return 0;
  }
  #endif
  
  /*
   * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
   * as a distribution range limit for the returned value.
   */
  static inline u16 skb_tx_hash(const struct net_device *dev,
  			      const struct sk_buff *skb)
  {
  	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
  }
  
  /**
   *	netif_is_multiqueue - test if device has multiple transmit queues
   *	@dev: network device
   *
   * Check if device has multiple transmit queues
   */
  static inline bool netif_is_multiqueue(const struct net_device *dev)
  {
  	return dev->num_tx_queues > 1;
  }
  
  int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
  
  #ifdef CONFIG_SYSFS
  int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
  #else
  static inline int netif_set_real_num_rx_queues(struct net_device *dev,
  						unsigned int rxq)
  {
  	return 0;
  }
  #endif
  
  static inline int netif_copy_real_num_queues(struct net_device *to_dev,
  					     const struct net_device *from_dev)
  {
  	int err;
  
  	err = netif_set_real_num_tx_queues(to_dev,
  					   from_dev->real_num_tx_queues);
  	if (err)
  		return err;
  #ifdef CONFIG_SYSFS
  	return netif_set_real_num_rx_queues(to_dev,
  					    from_dev->real_num_rx_queues);
  #else
  	return 0;
  #endif
  }
  
  #ifdef CONFIG_SYSFS
  static inline unsigned int get_netdev_rx_queue_index(
  		struct netdev_rx_queue *queue)
  {
  	struct net_device *dev = queue->dev;
  	int index = queue - dev->_rx;
  
  	BUG_ON(index >= dev->num_rx_queues);
  	return index;
  }
  #endif
  
  #define DEFAULT_MAX_NUM_RSS_QUEUES	(8)
  int netif_get_num_default_rss_queues(void);
  
  enum skb_free_reason {
  	SKB_REASON_CONSUMED,
  	SKB_REASON_DROPPED,
  };
  
  void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason);
  void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason);
  
  /*
   * It is not allowed to call kfree_skb() or consume_skb() from hardware
   * interrupt context or with hardware interrupts being disabled.
   * (in_irq() || irqs_disabled())
   *
   * We provide four helpers that can be used in following contexts :
   *
   * dev_kfree_skb_irq(skb) when caller drops a packet from irq context,
   *  replacing kfree_skb(skb)
   *
   * dev_consume_skb_irq(skb) when caller consumes a packet from irq context.
   *  Typically used in place of consume_skb(skb) in TX completion path
   *
   * dev_kfree_skb_any(skb) when caller doesn't know its current irq context,
   *  replacing kfree_skb(skb)
   *
   * dev_consume_skb_any(skb) when caller doesn't know its current irq context,
   *  and consumed a packet. Used in place of consume_skb(skb)
   */
  static inline void dev_kfree_skb_irq(struct sk_buff *skb)
  {
  	__dev_kfree_skb_irq(skb, SKB_REASON_DROPPED);
  }
  
  static inline void dev_consume_skb_irq(struct sk_buff *skb)
  {
  	__dev_kfree_skb_irq(skb, SKB_REASON_CONSUMED);
  }
  
  static inline void dev_kfree_skb_any(struct sk_buff *skb)
  {
  	__dev_kfree_skb_any(skb, SKB_REASON_DROPPED);
  }
  
  static inline void dev_consume_skb_any(struct sk_buff *skb)
  {
  	__dev_kfree_skb_any(skb, SKB_REASON_CONSUMED);
  }
  
  int netif_rx(struct sk_buff *skb);
  int netif_rx_ni(struct sk_buff *skb);
  int netif_receive_skb(struct sk_buff *skb);
  gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb);
  void napi_gro_flush(struct napi_struct *napi, bool flush_old);
  struct sk_buff *napi_get_frags(struct napi_struct *napi);
  gro_result_t napi_gro_frags(struct napi_struct *napi);
  struct packet_offload *gro_find_receive_by_type(__be16 type);
  struct packet_offload *gro_find_complete_by_type(__be16 type);
  
  static inline void napi_free_frags(struct napi_struct *napi)
  {
  	kfree_skb(napi->skb);
  	napi->skb = NULL;
  }
  
  int netdev_rx_handler_register(struct net_device *dev,
  			       rx_handler_func_t *rx_handler,
  			       void *rx_handler_data);
  void netdev_rx_handler_unregister(struct net_device *dev);
  
  bool dev_valid_name(const char *name);
  int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
  int dev_ethtool(struct net *net, struct ifreq *);
  unsigned int dev_get_flags(const struct net_device *);
  int __dev_change_flags(struct net_device *, unsigned int flags);
  int dev_change_flags(struct net_device *, unsigned int);
  void __dev_notify_flags(struct net_device *, unsigned int old_flags,
  			unsigned int gchanges);
  int dev_change_name(struct net_device *, const char *);
  int dev_set_alias(struct net_device *, const char *, size_t);
  int dev_change_net_namespace(struct net_device *, struct net *, const char *);
  int dev_set_mtu(struct net_device *, int);
  void dev_set_group(struct net_device *, int);
  int dev_set_mac_address(struct net_device *, struct sockaddr *);
  int dev_change_carrier(struct net_device *, bool new_carrier);
  int dev_get_phys_port_id(struct net_device *dev,
  			 struct netdev_phys_port_id *ppid);
  int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
  			struct netdev_queue *txq);
  int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
  int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
  bool is_skb_forwardable(struct net_device *dev, struct sk_buff *skb);
  
  extern int		netdev_budget;
  
  /* Called by rtnetlink.c:rtnl_unlock() */
  void netdev_run_todo(void);
  
  /**
   *	dev_put - release reference to device
   *	@dev: network device
   *
   * Release reference to device to allow it to be freed.
   */
  static inline void dev_put(struct net_device *dev)
  {
  	this_cpu_dec(*dev->pcpu_refcnt);
  }
  
  /**
   *	dev_hold - get reference to device
   *	@dev: network device
   *
   * Hold reference to device to keep it from being freed.
   */
  static inline void dev_hold(struct net_device *dev)
  {
  	this_cpu_inc(*dev->pcpu_refcnt);
  }
  
  /* Carrier loss detection, dial on demand. The functions netif_carrier_on
   * and _off may be called from IRQ context, but it is caller
   * who is responsible for serialization of these calls.
   *
   * The name carrier is inappropriate, these functions should really be
   * called netif_lowerlayer_*() because they represent the state of any
   * kind of lower layer not just hardware media.
   */
  
  void linkwatch_init_dev(struct net_device *dev);
  void linkwatch_fire_event(struct net_device *dev);
  void linkwatch_forget_dev(struct net_device *dev);
  
  /**
   *	netif_carrier_ok - test if carrier present
   *	@dev: network device
   *
   * Check if carrier is present on device
   */
  static inline bool netif_carrier_ok(const struct net_device *dev)
  {
  	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
  }
  
  unsigned long dev_trans_start(struct net_device *dev);
  
  void __netdev_watchdog_up(struct net_device *dev);
  
  void netif_carrier_on(struct net_device *dev);
  
  void netif_carrier_off(struct net_device *dev);
  
  /**
   *	netif_dormant_on - mark device as dormant.
   *	@dev: network device
   *
   * Mark device as dormant (as per RFC2863).
   *
   * The dormant state indicates that the relevant interface is not
   * actually in a condition to pass packets (i.e., it is not 'up') but is
   * in a "pending" state, waiting for some external event.  For "on-
   * demand" interfaces, this new state identifies the situation where the
   * interface is waiting for events to place it in the up state.
   *
   */
  static inline void netif_dormant_on(struct net_device *dev)
  {
  	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
  		linkwatch_fire_event(dev);
  }
  
  /**
   *	netif_dormant_off - set device as not dormant.
   *	@dev: network device
   *
   * Device is not in dormant state.
   */
  static inline void netif_dormant_off(struct net_device *dev)
  {
  	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
  		linkwatch_fire_event(dev);
  }
  
  /**
   *	netif_dormant - test if carrier present
   *	@dev: network device
   *
   * Check if carrier is present on device
   */
  static inline bool netif_dormant(const struct net_device *dev)
  {
  	return test_bit(__LINK_STATE_DORMANT, &dev->state);
  }
  
  
  /**
   *	netif_oper_up - test if device is operational
   *	@dev: network device
   *
   * Check if carrier is operational
   */
  static inline bool netif_oper_up(const struct net_device *dev)
  {
  	return (dev->operstate == IF_OPER_UP ||
  		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
  }
  
  /**
   *	netif_device_present - is device available or removed
   *	@dev: network device
   *
   * Check if device has not been removed from system.
   */
  static inline bool netif_device_present(struct net_device *dev)
  {
  	return test_bit(__LINK_STATE_PRESENT, &dev->state);
  }
  
  void netif_device_detach(struct net_device *dev);
  
  void netif_device_attach(struct net_device *dev);
  
  /*
   * Network interface message level settings
   */
  
  enum {
  	NETIF_MSG_DRV		= 0x0001,
  	NETIF_MSG_PROBE		= 0x0002,
  	NETIF_MSG_LINK		= 0x0004,
  	NETIF_MSG_TIMER		= 0x0008,
  	NETIF_MSG_IFDOWN	= 0x0010,
  	NETIF_MSG_IFUP		= 0x0020,
  	NETIF_MSG_RX_ERR	= 0x0040,
  	NETIF_MSG_TX_ERR	= 0x0080,
  	NETIF_MSG_TX_QUEUED	= 0x0100,
  	NETIF_MSG_INTR		= 0x0200,
  	NETIF_MSG_TX_DONE	= 0x0400,
  	NETIF_MSG_RX_STATUS	= 0x0800,
  	NETIF_MSG_PKTDATA	= 0x1000,
  	NETIF_MSG_HW		= 0x2000,
  	NETIF_MSG_WOL		= 0x4000,
  };
  
  #define netif_msg_drv(p)	((p)->msg_enable & NETIF_MSG_DRV)
  #define netif_msg_probe(p)	((p)->msg_enable & NETIF_MSG_PROBE)
  #define netif_msg_link(p)	((p)->msg_enable & NETIF_MSG_LINK)
  #define netif_msg_timer(p)	((p)->msg_enable & NETIF_MSG_TIMER)
  #define netif_msg_ifdown(p)	((p)->msg_enable & NETIF_MSG_IFDOWN)
  #define netif_msg_ifup(p)	((p)->msg_enable & NETIF_MSG_IFUP)
  #define netif_msg_rx_err(p)	((p)->msg_enable & NETIF_MSG_RX_ERR)
  #define netif_msg_tx_err(p)	((p)->msg_enable & NETIF_MSG_TX_ERR)
  #define netif_msg_tx_queued(p)	((p)->msg_enable & NETIF_MSG_TX_QUEUED)
  #define netif_msg_intr(p)	((p)->msg_enable & NETIF_MSG_INTR)
  #define netif_msg_tx_done(p)	((p)->msg_enable & NETIF_MSG_TX_DONE)
  #define netif_msg_rx_status(p)	((p)->msg_enable & NETIF_MSG_RX_STATUS)
  #define netif_msg_pktdata(p)	((p)->msg_enable & NETIF_MSG_PKTDATA)
  #define netif_msg_hw(p)		((p)->msg_enable & NETIF_MSG_HW)
  #define netif_msg_wol(p)	((p)->msg_enable & NETIF_MSG_WOL)
  
  static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
  {
  	/* use default */
  	if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
  		return default_msg_enable_bits;
  	if (debug_value == 0)	/* no output */
  		return 0;
  	/* set low N bits */
  	return (1 << debug_value) - 1;
  }
  
  static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
  {
  	spin_lock(&txq->_xmit_lock);
  	txq->xmit_lock_owner = cpu;
  }
  
  static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
  {
  	spin_lock_bh(&txq->_xmit_lock);
  	txq->xmit_lock_owner = smp_processor_id();
  }
  
  static inline bool __netif_tx_trylock(struct netdev_queue *txq)
  {
  	bool ok = spin_trylock(&txq->_xmit_lock);
  	if (likely(ok))
  		txq->xmit_lock_owner = smp_processor_id();
  	return ok;
  }
  
  static inline void __netif_tx_unlock(struct netdev_queue *txq)
  {
  	txq->xmit_lock_owner = -1;
  	spin_unlock(&txq->_xmit_lock);
  }
  
  static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
  {
  	txq->xmit_lock_owner = -1;
  	spin_unlock_bh(&txq->_xmit_lock);
  }
  
  static inline void txq_trans_update(struct netdev_queue *txq)
  {
  	if (txq->xmit_lock_owner != -1)
  		txq->trans_start = jiffies;
  }
  
  /**
   *	netif_tx_lock - grab network device transmit lock
   *	@dev: network device
   *
   * Get network device transmit lock
   */
  static inline void netif_tx_lock(struct net_device *dev)
  {
  	unsigned int i;
  	int cpu;
  
  	spin_lock(&dev->tx_global_lock);
  	cpu = smp_processor_id();
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  
  		/* We are the only thread of execution doing a
  		 * freeze, but we have to grab the _xmit_lock in
  		 * order to synchronize with threads which are in
  		 * the ->hard_start_xmit() handler and already
  		 * checked the frozen bit.
  		 */
  		__netif_tx_lock(txq, cpu);
  		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
  		__netif_tx_unlock(txq);
  	}
  }
  
  static inline void netif_tx_lock_bh(struct net_device *dev)
  {
  	local_bh_disable();
  	netif_tx_lock(dev);
  }
  
  static inline void netif_tx_unlock(struct net_device *dev)
  {
  	unsigned int i;
  
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  
  		/* No need to grab the _xmit_lock here.  If the
  		 * queue is not stopped for another reason, we
  		 * force a schedule.
  		 */
  		clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
  		netif_schedule_queue(txq);
  	}
  	spin_unlock(&dev->tx_global_lock);
  }
  
  static inline void netif_tx_unlock_bh(struct net_device *dev)
  {
  	netif_tx_unlock(dev);
  	local_bh_enable();
  }
  
  #define HARD_TX_LOCK(dev, txq, cpu) {			\
  	if ((dev->features & NETIF_F_LLTX) == 0) {	\
  		__netif_tx_lock(txq, cpu);		\
  	}						\
  }
  
  #define HARD_TX_TRYLOCK(dev, txq)			\
  	(((dev->features & NETIF_F_LLTX) == 0) ?	\
  		__netif_tx_trylock(txq) :		\
  		true )
  
  #define HARD_TX_UNLOCK(dev, txq) {			\
  	if ((dev->features & NETIF_F_LLTX) == 0) {	\
  		__netif_tx_unlock(txq);			\
  	}						\
  }
  
  static inline void netif_tx_disable(struct net_device *dev)
  {
  	unsigned int i;
  	int cpu;
  
  	local_bh_disable();
  	cpu = smp_processor_id();
  	for (i = 0; i < dev->num_tx_queues; i++) {
  		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  
  		__netif_tx_lock(txq, cpu);
  		netif_tx_stop_queue(txq);
  		__netif_tx_unlock(txq);
  	}
  	local_bh_enable();
  }
  
  static inline void netif_addr_lock(struct net_device *dev)
  {
  	spin_lock(&dev->addr_list_lock);
  }
  
  static inline void netif_addr_lock_nested(struct net_device *dev)
  {
  	int subclass = SINGLE_DEPTH_NESTING;
  
  	if (dev->netdev_ops->ndo_get_lock_subclass)
  		subclass = dev->netdev_ops->ndo_get_lock_subclass(dev);
  
  	spin_lock_nested(&dev->addr_list_lock, subclass);
  }
  
  static inline void netif_addr_lock_bh(struct net_device *dev)
  {
  	spin_lock_bh(&dev->addr_list_lock);
  }
  
  static inline void netif_addr_unlock(struct net_device *dev)
  {
  	spin_unlock(&dev->addr_list_lock);
  }
  
  static inline void netif_addr_unlock_bh(struct net_device *dev)
  {
  	spin_unlock_bh(&dev->addr_list_lock);
  }
  
  /*
   * dev_addrs walker. Should be used only for read access. Call with
   * rcu_read_lock held.
   */
  #define for_each_dev_addr(dev, ha) \
  		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
  
  /* These functions live elsewhere (drivers/net/net_init.c, but related) */
  
  void ether_setup(struct net_device *dev);
  
  /* Support for loadable net-drivers */
  struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
  				    void (*setup)(struct net_device *),
  				    unsigned int txqs, unsigned int rxqs);
  #define alloc_netdev(sizeof_priv, name, setup) \
  	alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
  
  #define alloc_netdev_mq(sizeof_priv, name, setup, count) \
  	alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
  
  int register_netdev(struct net_device *dev);
  void unregister_netdev(struct net_device *dev);
  
  /* General hardware address lists handling functions */
  int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
  		   struct netdev_hw_addr_list *from_list, int addr_len);
  void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
  		      struct netdev_hw_addr_list *from_list, int addr_len);
  int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
  		       struct net_device *dev,
  		       int (*sync)(struct net_device *, const unsigned char *),
  		       int (*unsync)(struct net_device *,
  				     const unsigned char *));
  void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
  			  struct net_device *dev,
  			  int (*unsync)(struct net_device *,
  					const unsigned char *));
  void __hw_addr_init(struct netdev_hw_addr_list *list);
  
  /* Functions used for device addresses handling */
  int dev_addr_add(struct net_device *dev, const unsigned char *addr,
  		 unsigned char addr_type);
  int dev_addr_del(struct net_device *dev, const unsigned char *addr,
  		 unsigned char addr_type);
  void dev_addr_flush(struct net_device *dev);
  int dev_addr_init(struct net_device *dev);
  
  /* Functions used for unicast addresses handling */
  int dev_uc_add(struct net_device *dev, const unsigned char *addr);
  int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
  int dev_uc_del(struct net_device *dev, const unsigned char *addr);
  int dev_uc_sync(struct net_device *to, struct net_device *from);
  int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
  void dev_uc_unsync(struct net_device *to, struct net_device *from);
  void dev_uc_flush(struct net_device *dev);
  void dev_uc_init(struct net_device *dev);
  
  /**
   *  __dev_uc_sync - Synchonize device's unicast list
   *  @dev:  device to sync
   *  @sync: function to call if address should be added
   *  @unsync: function to call if address should be removed
   *
   *  Add newly added addresses to the interface, and release
   *  addresses that have been deleted.
   **/
  static inline int __dev_uc_sync(struct net_device *dev,
  				int (*sync)(struct net_device *,
  					    const unsigned char *),
  				int (*unsync)(struct net_device *,
  					      const unsigned char *))
  {
  	return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
  }
  
  /**
   *  __dev_uc_unsync - Remove synchonized addresses from device
   *  @dev:  device to sync
   *  @unsync: function to call if address should be removed
   *
   *  Remove all addresses that were added to the device by dev_uc_sync().
   **/
  static inline void __dev_uc_unsync(struct net_device *dev,
  				   int (*unsync)(struct net_device *,
  						 const unsigned char *))
  {
  	__hw_addr_unsync_dev(&dev->uc, dev, unsync);
  }
  
  /* Functions used for multicast addresses handling */
  int dev_mc_add(struct net_device *dev, const unsigned char *addr);
  int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
  int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
  int dev_mc_del(struct net_device *dev, const unsigned char *addr);
  int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
  int dev_mc_sync(struct net_device *to, struct net_device *from);
  int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
  void dev_mc_unsync(struct net_device *to, struct net_device *from);
  void dev_mc_flush(struct net_device *dev);
  void dev_mc_init(struct net_device *dev);
  
  /**
   *  __dev_mc_sync - Synchonize device's multicast list
   *  @dev:  device to sync
   *  @sync: function to call if address should be added
   *  @unsync: function to call if address should be removed
   *
   *  Add newly added addresses to the interface, and release
   *  addresses that have been deleted.
   **/
  static inline int __dev_mc_sync(struct net_device *dev,
  				int (*sync)(struct net_device *,
  					    const unsigned char *),
  				int (*unsync)(struct net_device *,
  					      const unsigned char *))
  {
  	return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
  }
  
  /**
   *  __dev_mc_unsync - Remove synchonized addresses from device
   *  @dev:  device to sync
   *  @unsync: function to call if address should be removed
   *
   *  Remove all addresses that were added to the device by dev_mc_sync().
   **/
  static inline void __dev_mc_unsync(struct net_device *dev,
  				   int (*unsync)(struct net_device *,
  						 const unsigned char *))
  {
  	__hw_addr_unsync_dev(&dev->mc, dev, unsync);
  }
  
  /* Functions used for secondary unicast and multicast support */
  void dev_set_rx_mode(struct net_device *dev);
  void __dev_set_rx_mode(struct net_device *dev);
  int dev_set_promiscuity(struct net_device *dev, int inc);
  int dev_set_allmulti(struct net_device *dev, int inc);
  void netdev_state_change(struct net_device *dev);
  void netdev_notify_peers(struct net_device *dev);
  void netdev_features_change(struct net_device *dev);
  /* Load a device via the kmod */
  void dev_load(struct net *net, const char *name);
  struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
  					struct rtnl_link_stats64 *storage);
  void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
  			     const struct net_device_stats *netdev_stats);
  
  extern int		netdev_max_backlog;
  extern int		netdev_tstamp_prequeue;
  extern int		weight_p;
  extern int		bpf_jit_enable;
  
  bool netdev_has_upper_dev(struct net_device *dev, struct net_device *upper_dev);
  struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
  						     struct list_head **iter);
  struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
  						     struct list_head **iter);
  
  /* iterate through upper list, must be called under RCU read lock */
  #define netdev_for_each_upper_dev_rcu(dev, updev, iter) \
  	for (iter = &(dev)->adj_list.upper, \
  	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
  	     updev; \
  	     updev = netdev_upper_get_next_dev_rcu(dev, &(iter)))
  
  /* iterate through upper list, must be called under RCU read lock */
  #define netdev_for_each_all_upper_dev_rcu(dev, updev, iter) \
  	for (iter = &(dev)->all_adj_list.upper, \
  	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)); \
  	     updev; \
  	     updev = netdev_all_upper_get_next_dev_rcu(dev, &(iter)))
  
  void *netdev_lower_get_next_private(struct net_device *dev,
  				    struct list_head **iter);
  void *netdev_lower_get_next_private_rcu(struct net_device *dev,
  					struct list_head **iter);
  
  #define netdev_for_each_lower_private(dev, priv, iter) \
  	for (iter = (dev)->adj_list.lower.next, \
  	     priv = netdev_lower_get_next_private(dev, &(iter)); \
  	     priv; \
  	     priv = netdev_lower_get_next_private(dev, &(iter)))
  
  #define netdev_for_each_lower_private_rcu(dev, priv, iter) \
  	for (iter = &(dev)->adj_list.lower, \
  	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)); \
  	     priv; \
  	     priv = netdev_lower_get_next_private_rcu(dev, &(iter)))
  
  void *netdev_lower_get_next(struct net_device *dev,
  				struct list_head **iter);
  #define netdev_for_each_lower_dev(dev, ldev, iter) \
  	for (iter = &(dev)->adj_list.lower, \
  	     ldev = netdev_lower_get_next(dev, &(iter)); \
  	     ldev; \
  	     ldev = netdev_lower_get_next(dev, &(iter)))
  
  void *netdev_adjacent_get_private(struct list_head *adj_list);
  void *netdev_lower_get_first_private_rcu(struct net_device *dev);
  struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
  struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
  int netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev);
  int netdev_master_upper_dev_link(struct net_device *dev,
  				 struct net_device *upper_dev);
  int netdev_master_upper_dev_link_private(struct net_device *dev,
  					 struct net_device *upper_dev,
  					 void *private);
  void netdev_upper_dev_unlink(struct net_device *dev,
  			     struct net_device *upper_dev);
  void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
  void *netdev_lower_dev_get_private(struct net_device *dev,
  				   struct net_device *lower_dev);
  int dev_get_nest_level(struct net_device *dev,
  		       bool (*type_check)(struct net_device *dev));
  int skb_checksum_help(struct sk_buff *skb);
  struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
  				  netdev_features_t features, bool tx_path);
  struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
  				    netdev_features_t features);
  
  static inline
  struct sk_buff *skb_gso_segment(struct sk_buff *skb, netdev_features_t features)
  {
  	return __skb_gso_segment(skb, features, true);
  }
  __be16 skb_network_protocol(struct sk_buff *skb, int *depth);
  
  static inline bool can_checksum_protocol(netdev_features_t features,
  					 __be16 protocol)
  {
  	return ((features & NETIF_F_GEN_CSUM) ||
  		((features & NETIF_F_V4_CSUM) &&
  		 protocol == htons(ETH_P_IP)) ||
  		((features & NETIF_F_V6_CSUM) &&
  		 protocol == htons(ETH_P_IPV6)) ||
  		((features & NETIF_F_FCOE_CRC) &&
  		 protocol == htons(ETH_P_FCOE)));
  }
  
  #ifdef CONFIG_BUG
  void netdev_rx_csum_fault(struct net_device *dev);
  #else
  static inline void netdev_rx_csum_fault(struct net_device *dev)
  {
  }
  #endif
  /* rx skb timestamps */
  void net_enable_timestamp(void);
  void net_disable_timestamp(void);
  
  #ifdef CONFIG_PROC_FS
  int __init dev_proc_init(void);
  #else
  #define dev_proc_init() 0
  #endif
  
  int netdev_class_create_file_ns(struct class_attribute *class_attr,
  				const void *ns);
  void netdev_class_remove_file_ns(struct class_attribute *class_attr,
  				 const void *ns);
  
  static inline int netdev_class_create_file(struct class_attribute *class_attr)
  {
  	return netdev_class_create_file_ns(class_attr, NULL);
  }
  
  static inline void netdev_class_remove_file(struct class_attribute *class_attr)
  {
  	netdev_class_remove_file_ns(class_attr, NULL);
  }
  
  extern struct kobj_ns_type_operations net_ns_type_operations;
  
  const char *netdev_drivername(const struct net_device *dev);
  
  void linkwatch_run_queue(void);
  
  static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
  							  netdev_features_t f2)
  {
  	if (f1 & NETIF_F_GEN_CSUM)
  		f1 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
  	if (f2 & NETIF_F_GEN_CSUM)
  		f2 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
  	f1 &= f2;
  	if (f1 & NETIF_F_GEN_CSUM)
  		f1 &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
  
  	return f1;
  }
  
  static inline netdev_features_t netdev_get_wanted_features(
  	struct net_device *dev)
  {
  	return (dev->features & ~dev->hw_features) | dev->wanted_features;
  }
  netdev_features_t netdev_increment_features(netdev_features_t all,
  	netdev_features_t one, netdev_features_t mask);
  
  /* Allow TSO being used on stacked device :
   * Performing the GSO segmentation before last device
   * is a performance improvement.
   */
  static inline netdev_features_t netdev_add_tso_features(netdev_features_t features,
  							netdev_features_t mask)
  {
  	return netdev_increment_features(features, NETIF_F_ALL_TSO, mask);
  }
  
  int __netdev_update_features(struct net_device *dev);
  void netdev_update_features(struct net_device *dev);
  void netdev_change_features(struct net_device *dev);
  
  void netif_stacked_transfer_operstate(const struct net_device *rootdev,
  					struct net_device *dev);
  
  netdev_features_t netif_skb_features(struct sk_buff *skb);
  
  static inline bool net_gso_ok(netdev_features_t features, int gso_type)
  {
  	netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
  
  	/* check flags correspondence */
  	BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_GRE     != (NETIF_F_GSO_GRE >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_GRE_CSUM != (NETIF_F_GSO_GRE_CSUM >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_IPIP    != (NETIF_F_GSO_IPIP >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_SIT     != (NETIF_F_GSO_SIT >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL != (NETIF_F_GSO_UDP_TUNNEL >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_UDP_TUNNEL_CSUM != (NETIF_F_GSO_UDP_TUNNEL_CSUM >> NETIF_F_GSO_SHIFT));
  	BUILD_BUG_ON(SKB_GSO_MPLS    != (NETIF_F_GSO_MPLS >> NETIF_F_GSO_SHIFT));
  
  	return (features & feature) == feature;
  }
  
  static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
  {
  	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
  	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
  }
  
  static inline bool netif_needs_gso(struct sk_buff *skb,
  				   netdev_features_t features)
  {
  	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
  		unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
  			 (skb->ip_summed != CHECKSUM_UNNECESSARY)));
  }
  
  static inline void netif_set_gso_max_size(struct net_device *dev,
  					  unsigned int size)
  {
  	dev->gso_max_size = size;
  }
  
  static inline void skb_gso_error_unwind(struct sk_buff *skb, __be16 protocol,
  					int pulled_hlen, u16 mac_offset,
  					int mac_len)
  {
  	skb->protocol = protocol;
  	skb->encapsulation = 1;
  	skb_push(skb, pulled_hlen);
  	skb_reset_transport_header(skb);
  	skb->mac_header = mac_offset;
  	skb->network_header = skb->mac_header + mac_len;
  	skb->mac_len = mac_len;
  }
  
  static inline bool netif_is_macvlan(struct net_device *dev)
  {
  	return dev->priv_flags & IFF_MACVLAN;
  }
  
  static inline bool netif_is_bond_master(struct net_device *dev)
  {
  	return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
  }
  
  static inline bool netif_is_bond_slave(struct net_device *dev)
  {
  	return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
  }
  
  static inline bool netif_supports_nofcs(struct net_device *dev)
  {
  	return dev->priv_flags & IFF_SUPP_NOFCS;
  }
  
  extern struct pernet_operations __net_initdata loopback_net_ops;
  
  /* Logging, debugging and troubleshooting/diagnostic helpers. */
  
  /* netdev_printk helpers, similar to dev_printk */
  
  static inline const char *netdev_name(const struct net_device *dev)
  {
  	if (dev->reg_state != NETREG_REGISTERED)
  		return "(unregistered net_device)";
  	return dev->name;
  }
  
  __printf(3, 4)
  int netdev_printk(const char *level, const struct net_device *dev,
  		  const char *format, ...);
  __printf(2, 3)
  int netdev_emerg(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_alert(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_crit(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_err(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_warn(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_notice(const struct net_device *dev, const char *format, ...);
  __printf(2, 3)
  int netdev_info(const struct net_device *dev, const char *format, ...);
  
  #define MODULE_ALIAS_NETDEV(device) \
  	MODULE_ALIAS("netdev-" device)
  
  #if defined(CONFIG_DYNAMIC_DEBUG)
  #define netdev_dbg(__dev, format, args...)			\
  do {								\
  	dynamic_netdev_dbg(__dev, format, ##args);		\
  } while (0)
  #elif defined(DEBUG)
  #define netdev_dbg(__dev, format, args...)			\
  	netdev_printk(KERN_DEBUG, __dev, format, ##args)
  #else
  #define netdev_dbg(__dev, format, args...)			\
  ({								\
  	if (0)							\
  		netdev_printk(KERN_DEBUG, __dev, format, ##args); \
  	0;							\
  })
  #endif
  
  #if defined(VERBOSE_DEBUG)
  #define netdev_vdbg	netdev_dbg
  #else
  
  #define netdev_vdbg(dev, format, args...)			\
  ({								\
  	if (0)							\
  		netdev_printk(KERN_DEBUG, dev, format, ##args);	\
  	0;							\
  })
  #endif
  
  /*
   * netdev_WARN() acts like dev_printk(), but with the key difference
   * of using a WARN/WARN_ON to get the message out, including the
   * file/line information and a backtrace.
   */
  #define netdev_WARN(dev, format, args...)			\
  	WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args)
  
  /* netif printk helpers, similar to netdev_printk */
  
  #define netif_printk(priv, type, level, dev, fmt, args...)	\
  do {					  			\
  	if (netif_msg_##type(priv))				\
  		netdev_printk(level, (dev), fmt, ##args);	\
  } while (0)
  
  #define netif_level(level, priv, type, dev, fmt, args...)	\
  do {								\
  	if (netif_msg_##type(priv))				\
  		netdev_##level(dev, fmt, ##args);		\
  } while (0)
  
  #define netif_emerg(priv, type, dev, fmt, args...)		\
  	netif_level(emerg, priv, type, dev, fmt, ##args)
  #define netif_alert(priv, type, dev, fmt, args...)		\
  	netif_level(alert, priv, type, dev, fmt, ##args)
  #define netif_crit(priv, type, dev, fmt, args...)		\
  	netif_level(crit, priv, type, dev, fmt, ##args)
  #define netif_err(priv, type, dev, fmt, args...)		\
  	netif_level(err, priv, type, dev, fmt, ##args)
  #define netif_warn(priv, type, dev, fmt, args...)		\
  	netif_level(warn, priv, type, dev, fmt, ##args)
  #define netif_notice(priv, type, dev, fmt, args...)		\
  	netif_level(notice, priv, type, dev, fmt, ##args)
  #define netif_info(priv, type, dev, fmt, args...)		\
  	netif_level(info, priv, type, dev, fmt, ##args)
  
  #if defined(CONFIG_DYNAMIC_DEBUG)
  #define netif_dbg(priv, type, netdev, format, args...)		\
  do {								\
  	if (netif_msg_##type(priv))				\
  		dynamic_netdev_dbg(netdev, format, ##args);	\
  } while (0)
  #elif defined(DEBUG)
  #define netif_dbg(priv, type, dev, format, args...)		\
  	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
  #else
  #define netif_dbg(priv, type, dev, format, args...)			\
  ({									\
  	if (0)								\
  		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
  	0;								\
  })
  #endif
  
  #if defined(VERBOSE_DEBUG)
  #define netif_vdbg	netif_dbg
  #else
  #define netif_vdbg(priv, type, dev, format, args...)		\
  ({								\
  	if (0)							\
  		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
  	0;							\
  })
  #endif
  
  /*
   *	The list of packet types we will receive (as opposed to discard)
   *	and the routines to invoke.
   *
   *	Why 16. Because with 16 the only overlap we get on a hash of the
   *	low nibble of the protocol value is RARP/SNAP/X.25.
   *
   *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
   *             sure which should go first, but I bet it won't make much
   *             difference if we are running VLANs.  The good news is that
   *             this protocol won't be in the list unless compiled in, so
   *             the average user (w/out VLANs) will not be adversely affected.
   *             --BLG
   *
   *		0800	IP
   *		8100    802.1Q VLAN
   *		0001	802.3
   *		0002	AX.25
   *		0004	802.2
   *		8035	RARP
   *		0005	SNAP
   *		0805	X.25
   *		0806	ARP
   *		8137	IPX
   *		0009	Localtalk
   *		86DD	IPv6
   */
  #define PTYPE_HASH_SIZE	(16)
  #define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)
  
  #endif	/* _LINUX_NETDEVICE_H */
  