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 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * 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>
  *
  *      Moved to /usr/include/linux for NET3
  */
 #ifndef _LINUX_NETDEVICE_H
 #define _LINUX_NETDEVICE_H
 
 #include <linux/timer.h>
 #include <linux/bug.h>
 #include <linux/delay.h>
 #include <linux/atomic.h>
 #include <linux/prefetch.h>
 #include <asm/cache.h>
 #include <asm/byteorder.h>
 #include <asm/local.h>
 
 #include <linux/percpu.h>
 #include <linux/rculist.h>
 #include <linux/workqueue.h>
 #include <linux/dynamic_queue_limits.h>
 
 #include <net/net_namespace.h>
 #ifdef CONFIG_DCB
 #include <net/dcbnl.h>
 #endif
 #include <net/netprio_cgroup.h>
 #include <net/xdp.h>
 
 #include <linux/netdev_features.h>
 #include <linux/neighbour.h>
 #include <uapi/linux/netdevice.h>
 #include <uapi/linux/if_bonding.h>
 #include <uapi/linux/pkt_cls.h>
 #include <linux/hashtable.h>
 #include <linux/rbtree.h>
 #include <net/net_trackers.h>
 #include <net/net_debug.h>
 
 struct netpoll_info;
 struct device;
 struct ethtool_ops;
 struct phy_device;
 struct dsa_port;
 struct ip_tunnel_parm;
 struct macsec_context;
 struct macsec_ops;
 struct netdev_name_node;
 struct sd_flow_limit;
 struct sfp_bus;
 /* 802.11 specific */
 struct wireless_dev;
 /* 802.15.4 specific */
 struct wpan_dev;
 struct mpls_dev;
 /* UDP Tunnel offloads */
 struct udp_tunnel_info;
 struct udp_tunnel_nic_info;
 struct udp_tunnel_nic;
 struct bpf_prog;
 struct xdp_buff;
 
 void synchronize_net(void);
 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 */
 
 #define MAX_NEST_DEV 8
 
 /*
  * 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(), and 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_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*/
 };
 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_HYPERV_NET)
 # define LL_MAX_HEADER 128
 #elif 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;
 };
 
 /* per-cpu stats, allocated on demand.
  * Try to fit them in a single cache line, for dev_get_stats() sake.
  */
 struct net_device_core_stats {
     unsigned long   rx_dropped;
     unsigned long   tx_dropped;
     unsigned long   rx_nohandler;
     unsigned long   rx_otherhost_dropped;
 } __aligned(4 * sizeof(unsigned long));
 
 #include <linux/cache.h>
 #include <linux/skbuff.h>
 
 #ifdef CONFIG_RPS
 #include <linux/static_key.h>
 extern struct static_key_false rps_needed;
 extern struct static_key_false rfs_needed;
 #endif
 
 struct neighbour;
 struct neigh_parms;
 struct sk_buff;
 
 struct netdev_hw_addr {
     struct list_head    list;
     struct rb_node      node;
     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_UNICAST    3
 #define NETDEV_HW_ADDR_T_MULTICAST  4
     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;
 
     /* Auxiliary tree for faster lookup on addition and deletion */
     struct rb_root      tree;
 };
 
 #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 {
     unsigned int    hh_len;
     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 (*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);
     bool    (*validate)(const char *ll_header, unsigned int len);
     __be16  (*parse_protocol)(const struct sk_buff *skb);
 };
 
 /* 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,
     __LINK_STATE_TESTING,
 };
 
 struct gro_list {
     struct list_head    list;
     int         count;
 };
 
 /*
  * size of gro hash buckets, must less than bit number of
  * napi_struct::gro_bitmask
  */
 #define GRO_HASH_BUCKETS    8
 
 /*
  * 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;
     int         defer_hard_irqs_count;
     unsigned long       gro_bitmask;
     int         (*poll)(struct napi_struct *, int);
 #ifdef CONFIG_NETPOLL
     int         poll_owner;
 #endif
     struct net_device   *dev;
     struct gro_list     gro_hash[GRO_HASH_BUCKETS];
     struct sk_buff      *skb;
     struct list_head    rx_list; /* Pending GRO_NORMAL skbs */
     int         rx_count; /* length of rx_list */
     struct hrtimer      timer;
     struct list_head    dev_list;
     struct hlist_node   napi_hash_node;
     unsigned int        napi_id;
     struct task_struct  *thread;
 };
 
 enum {
     NAPI_STATE_SCHED,       /* Poll is scheduled */
     NAPI_STATE_MISSED,      /* reschedule a napi */
     NAPI_STATE_DISABLE,     /* Disable pending */
     NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
     NAPI_STATE_LISTED,      /* NAPI added to system lists */
     NAPI_STATE_NO_BUSY_POLL,    /* Do not add in napi_hash, no busy polling */
     NAPI_STATE_IN_BUSY_POLL,    /* sk_busy_loop() owns this NAPI */
     NAPI_STATE_PREFER_BUSY_POLL,    /* prefer busy-polling over softirq processing*/
     NAPI_STATE_THREADED,        /* The poll is performed inside its own thread*/
     NAPI_STATE_SCHED_THREADED,  /* Napi is currently scheduled in threaded mode */
 };
 
 enum {
     NAPIF_STATE_SCHED       = BIT(NAPI_STATE_SCHED),
     NAPIF_STATE_MISSED      = BIT(NAPI_STATE_MISSED),
     NAPIF_STATE_DISABLE     = BIT(NAPI_STATE_DISABLE),
     NAPIF_STATE_NPSVC       = BIT(NAPI_STATE_NPSVC),
     NAPIF_STATE_LISTED      = BIT(NAPI_STATE_LISTED),
     NAPIF_STATE_NO_BUSY_POLL    = BIT(NAPI_STATE_NO_BUSY_POLL),
     NAPIF_STATE_IN_BUSY_POLL    = BIT(NAPI_STATE_IN_BUSY_POLL),
     NAPIF_STATE_PREFER_BUSY_POLL    = BIT(NAPI_STATE_PREFER_BUSY_POLL),
     NAPIF_STATE_THREADED        = BIT(NAPI_STATE_THREADED),
     NAPIF_STATE_SCHED_THREADED  = BIT(NAPI_STATE_SCHED_THREADED),
 };
 
 enum gro_result {
     GRO_MERGED,
     GRO_MERGED_FREE,
     GRO_HELD,
     GRO_NORMAL,
     GRO_CONSUMED,
 };
 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, pass 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 the 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 way.
  *
  * 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 decides 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 change skb->dev, but wants 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);
 void __napi_schedule_irqoff(struct napi_struct *n);
 
 static inline bool napi_disable_pending(struct napi_struct *n)
 {
     return test_bit(NAPI_STATE_DISABLE, &n->state);
 }
 
 static inline bool napi_prefer_busy_poll(struct napi_struct *n)
 {
     return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state);
 }
 
 bool napi_schedule_prep(struct napi_struct *n);
 
 /**
  *  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);
 }
 
 /**
  *  napi_schedule_irqoff - schedule NAPI poll
  *  @n: NAPI context
  *
  * Variant of napi_schedule(), assuming hard irqs are masked.
  */
 static inline void napi_schedule_irqoff(struct napi_struct *n)
 {
     if (napi_schedule_prep(n))
         __napi_schedule_irqoff(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;
 }
 
 bool napi_complete_done(struct napi_struct *n, int work_done);
 /**
  *  napi_complete - NAPI processing complete
  *  @n: NAPI context
  *
  * Mark NAPI processing as complete.
  * Consider using napi_complete_done() instead.
  * Return false if device should avoid rearming interrupts.
  */
 static inline bool napi_complete(struct napi_struct *n)
 {
     return napi_complete_done(n, 0);
 }
 
 int dev_set_threaded(struct net_device *dev, bool threaded);
 
 /**
  *  napi_disable - prevent NAPI from scheduling
  *  @n: NAPI context
  *
  * Stop NAPI from being scheduled on this context.
  * Waits till any outstanding processing completes.
  */
 void napi_disable(struct napi_struct *n);
 
 void napi_enable(struct napi_struct *n);
 
 /**
  *  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)
 {
     if (IS_ENABLED(CONFIG_SMP))
         while (test_bit(NAPI_STATE_SCHED, &n->state))
             msleep(1);
     else
         barrier();
 }
 
 /**
  *  napi_if_scheduled_mark_missed - if napi is running, set the
  *  NAPIF_STATE_MISSED
  *  @n: NAPI context
  *
  * If napi is running, set the NAPIF_STATE_MISSED, and return true if
  * NAPI is scheduled.
  **/
 static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n)
 {
     unsigned long val, new;
 
     do {
         val = READ_ONCE(n->state);
         if (val & NAPIF_STATE_DISABLE)
             return true;
 
         if (!(val & NAPIF_STATE_SCHED))
             return false;
 
         new = val | NAPIF_STATE_MISSED;
     } while (cmpxchg(&n->state, val, new) != val);
 
     return true;
 }
 
 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;
     netdevice_tracker   dev_tracker;
 
     struct Qdisc __rcu  *qdisc;
     struct Qdisc        *qdisc_sleeping;
 #ifdef CONFIG_SYSFS
     struct kobject      kobj;
 #endif
 #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
     int         numa_node;
 #endif
     unsigned long       tx_maxrate;
     /*
      * Number of TX timeouts for this queue
      * (/sys/class/net/DEV/Q/trans_timeout)
      */
     atomic_long_t       trans_timeout;
 
     /* Subordinate device that the queue has been assigned to */
     struct net_device   *sb_dev;
 #ifdef CONFIG_XDP_SOCKETS
     struct xsk_buff_pool    *pool;
 #endif
 /*
  * write-mostly part
  */
     spinlock_t      _xmit_lock ____cacheline_aligned_in_smp;
     int         xmit_lock_owner;
     /*
      * Time (in jiffies) of last Tx
      */
     unsigned long       trans_start;
 
     unsigned long       state;
 
 #ifdef CONFIG_BQL
     struct dql      dql;
 #endif
 } ____cacheline_aligned_in_smp;
 
 extern int sysctl_fb_tunnels_only_for_init_net;
 extern int sysctl_devconf_inherit_init_net;
 
 /*
  * sysctl_fb_tunnels_only_for_init_net == 0 : For all netns
  *                                     == 1 : For initns only
  *                                     == 2 : For none.
  */
 static inline bool net_has_fallback_tunnels(const struct net *net)
 {
 #if IS_ENABLED(CONFIG_SYSCTL)
     int fb_tunnels_only_for_init_net = READ_ONCE(sysctl_fb_tunnels_only_for_init_net);
 
     return !fb_tunnels_only_for_init_net ||
         (net_eq(net, &init_net) && fb_tunnels_only_for_init_net == 1);
 #else
     return true;
 #endif
 }
 
 static inline int net_inherit_devconf(void)
 {
 #if IS_ENABLED(CONFIG_SYSCTL)
     return READ_ONCE(sysctl_devconf_inherit_init_net);
 #else
     return 0;
 #endif
 }
 
 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[];
 };
 #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[];
 };
 #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).
  * Each entry is a 32bit value. Upper part is the high-order bits
  * of flow hash, lower part is CPU number.
  * rps_cpu_mask is used to partition the space, depending on number of
  * possible CPUs : rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1
  * For example, if 64 CPUs are possible, rps_cpu_mask = 0x3f,
  * meaning we use 32-6=26 bits for the hash.
  */
 struct rps_sock_flow_table {
     u32 mask;
 
     u32 ents[] ____cacheline_aligned_in_smp;
 };
 #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (offsetof(struct rps_sock_flow_table, ents[_num]))
 
 #define RPS_NO_CPU 0xffff
 
 extern u32 rps_cpu_mask;
 extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
 
 static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
                     u32 hash)
 {
     if (table && hash) {
         unsigned int index = hash & table->mask;
         u32 val = hash & ~rps_cpu_mask;
 
         /* We only give a hint, preemption can change CPU under us */
         val |= raw_smp_processor_id();
 
         if (table->ents[index] != val)
             table->ents[index] = val;
     }
 }
 
 #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 {
     struct xdp_rxq_info     xdp_rxq;
 #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;
     netdevice_tracker       dev_tracker;
 
 #ifdef CONFIG_XDP_SOCKETS
     struct xsk_buff_pool            *pool;
 #endif
 } ____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, char *buf);
     ssize_t (*store)(struct netdev_rx_queue *queue,
              const char *buf, size_t len);
 };
 
 /* XPS map type and offset of the xps map within net_device->xps_maps[]. */
 enum xps_map_type {
     XPS_CPUS = 0,
     XPS_RXQS,
     XPS_MAPS_MAX,
 };
 
 #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[];
 };
 #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
 #define XPS_MIN_MAP_ALLOC ((L1_CACHE_ALIGN(offsetof(struct xps_map, queues[1])) \
        - sizeof(struct xps_map)) / sizeof(u16))
 
 /*
  * This structure holds all XPS maps for device.  Maps are indexed by CPU.
  *
  * We keep track of the number of cpus/rxqs used when the struct is allocated,
  * in nr_ids. This will help not accessing out-of-bound memory.
  *
  * We keep track of the number of traffic classes used when the struct is
  * allocated, in num_tc. This will be used to navigate the maps, to ensure we're
  * not crossing its upper bound, as the original dev->num_tc can be updated in
  * the meantime.
  */
 struct xps_dev_maps {
     struct rcu_head rcu;
     unsigned int nr_ids;
     s16 num_tc;
     struct xps_map __rcu *attr_map[]; /* Either CPUs map or RXQs map */
 };
 
 #define XPS_CPU_DEV_MAPS_SIZE(_tcs) (sizeof(struct xps_dev_maps) +  \
     (nr_cpu_ids * (_tcs) * sizeof(struct xps_map *)))
 
 #define XPS_RXQ_DEV_MAPS_SIZE(_tcs, _rxqs) (sizeof(struct xps_dev_maps) +\
     (_rxqs * (_tcs) * 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_ITEM_ID_LEN 32
 
 /* This structure holds a unique identifier to identify some
  * physical item (port for example) used by a netdevice.
  */
 struct netdev_phys_item_id {
     unsigned char id[MAX_PHYS_ITEM_ID_LEN];
     unsigned char id_len;
 };
 
 static inline bool netdev_phys_item_id_same(struct netdev_phys_item_id *a,
                         struct netdev_phys_item_id *b)
 {
     return a->id_len == b->id_len &&
            memcmp(a->id, b->id, a->id_len) == 0;
 }
 
 typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
                        struct sk_buff *skb,
                        struct net_device *sb_dev);
 
 enum net_device_path_type {
     DEV_PATH_ETHERNET = 0,
     DEV_PATH_VLAN,
     DEV_PATH_BRIDGE,
     DEV_PATH_PPPOE,
     DEV_PATH_DSA,
     DEV_PATH_MTK_WDMA,
 };
 
 struct net_device_path {
     enum net_device_path_type   type;
     const struct net_device     *dev;
     union {
         struct {
             u16     id;
             __be16      proto;
             u8      h_dest[ETH_ALEN];
         } encap;
         struct {
             enum {
                 DEV_PATH_BR_VLAN_KEEP,
                 DEV_PATH_BR_VLAN_TAG,
                 DEV_PATH_BR_VLAN_UNTAG,
                 DEV_PATH_BR_VLAN_UNTAG_HW,
             }       vlan_mode;
             u16     vlan_id;
             __be16      vlan_proto;
         } bridge;
         struct {
             int port;
             u16 proto;
         } dsa;
         struct {
             u8 wdma_idx;
             u8 queue;
             u16 wcid;
             u8 bss;
         } mtk_wdma;
     };
 };
 
 #define NET_DEVICE_PATH_STACK_MAX   5
 #define NET_DEVICE_PATH_VLAN_MAX    2
 
 struct net_device_path_stack {
     int         num_paths;
     struct net_device_path  path[NET_DEVICE_PATH_STACK_MAX];
 };
 
 struct net_device_path_ctx {
     const struct net_device *dev;
     u8          daddr[ETH_ALEN];
 
     int         num_vlans;
     struct {
         u16     id;
         __be16      proto;
     } vlan[NET_DEVICE_PATH_VLAN_MAX];
 };
 
 enum tc_setup_type {
     TC_SETUP_QDISC_MQPRIO,
     TC_SETUP_CLSU32,
     TC_SETUP_CLSFLOWER,
     TC_SETUP_CLSMATCHALL,
     TC_SETUP_CLSBPF,
     TC_SETUP_BLOCK,
     TC_SETUP_QDISC_CBS,
     TC_SETUP_QDISC_RED,
     TC_SETUP_QDISC_PRIO,
     TC_SETUP_QDISC_MQ,
     TC_SETUP_QDISC_ETF,
     TC_SETUP_ROOT_QDISC,
     TC_SETUP_QDISC_GRED,
     TC_SETUP_QDISC_TAPRIO,
     TC_SETUP_FT,
     TC_SETUP_QDISC_ETS,
     TC_SETUP_QDISC_TBF,
     TC_SETUP_QDISC_FIFO,
     TC_SETUP_QDISC_HTB,
     TC_SETUP_ACT,
 };
 
 /* These structures hold the attributes of bpf state that are being passed
  * to the netdevice through the bpf op.
  */
 enum bpf_netdev_command {
     /* Set or clear a bpf program used in the earliest stages of packet
      * rx. The prog will have been loaded as BPF_PROG_TYPE_XDP. The callee
      * is responsible for calling bpf_prog_put on any old progs that are
      * stored. In case of error, the callee need not release the new prog
      * reference, but on success it takes ownership and must bpf_prog_put
      * when it is no longer used.
      */
     XDP_SETUP_PROG,
     XDP_SETUP_PROG_HW,
     /* BPF program for offload callbacks, invoked at program load time. */
     BPF_OFFLOAD_MAP_ALLOC,
     BPF_OFFLOAD_MAP_FREE,
     XDP_SETUP_XSK_POOL,
 };
 
 struct bpf_prog_offload_ops;
 struct netlink_ext_ack;
 struct xdp_umem;
 struct xdp_dev_bulk_queue;
 struct bpf_xdp_link;
 
 enum bpf_xdp_mode {
     XDP_MODE_SKB = 0,
     XDP_MODE_DRV = 1,
     XDP_MODE_HW = 2,
     __MAX_XDP_MODE
 };
 
 struct bpf_xdp_entity {
     struct bpf_prog *prog;
     struct bpf_xdp_link *link;
 };
 
 struct netdev_bpf {
     enum bpf_netdev_command command;
     union {
         /* XDP_SETUP_PROG */
         struct {
             u32 flags;
             struct bpf_prog *prog;
             struct netlink_ext_ack *extack;
         };
         /* BPF_OFFLOAD_MAP_ALLOC, BPF_OFFLOAD_MAP_FREE */
         struct {
             struct bpf_offloaded_map *offmap;
         };
         /* XDP_SETUP_XSK_POOL */
         struct {
             struct xsk_buff_pool *pool;
             u16 queue_id;
         } xsk;
     };
 };
 
 /* Flags for ndo_xsk_wakeup. */
 #define XDP_WAKEUP_RX (1 << 0)
 #define XDP_WAKEUP_TX (1 << 1)
 
 #ifdef CONFIG_XFRM_OFFLOAD
 struct xfrmdev_ops {
     int (*xdo_dev_state_add) (struct xfrm_state *x);
     void    (*xdo_dev_state_delete) (struct xfrm_state *x);
     void    (*xdo_dev_state_free) (struct xfrm_state *x);
     bool    (*xdo_dev_offload_ok) (struct sk_buff *skb,
                        struct xfrm_state *x);
     void    (*xdo_dev_state_advance_esn) (struct xfrm_state *x);
 };
 #endif
 
 struct dev_ifalias {
     struct rcu_head rcuhead;
     char ifalias[];
 };
 
 struct devlink;
 struct tlsdev_ops;
 
 struct netdev_net_notifier {
     struct list_head list;
     struct notifier_block *nb;
 };
 
 /*
  * 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 a network device is registered.
  *     The network device can use this for any late stage initialization
  *     or semantic validation. It can fail with an error code which will
  *     be propagated 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 a network device transitions to the up
  *     state.
  *
  * int (*ndo_stop)(struct net_device *dev);
  *     This function is called when a network device transitions 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.
  *  Returns NETDEV_TX_OK.  Can return NETDEV_TX_BUSY, but you should stop
  *  the queue before that can happen; it's for obsolete devices and weird
  *  corner cases, but the stack really does a non-trivial amount
  *  of useless work if you return NETDEV_TX_BUSY.
  *  Required; cannot be NULL.
  *
  * netdev_features_t (*ndo_features_check)(struct sk_buff *skb,
  *                     struct net_device *dev
  *                     netdev_features_t features);
  *  Called by core transmit path to determine if device is capable of
  *  performing offload operations on a given packet. This is to give
  *  the device an opportunity to implement any restrictions that cannot
  *  be otherwise expressed by feature flags. The check is called with
  *  the set of features that the stack has calculated and it returns
  *  those the driver believes to be appropriate.
  *
  * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb,
  *                         struct net_device *sb_dev);
  *  Called to decide which queue to use 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 promiscuous 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 in 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);
  *  Old-style ioctl entry point. This is used internally by the
  *  appletalk and ieee802154 subsystems but is no longer called by
  *  the device ioctl handler.
  *
  * int (*ndo_siocbond)(struct net_device *dev, struct ifreq *ifr, int cmd);
  *  Used by the bonding driver for its device specific ioctls:
  *  SIOCBONDENSLAVE, SIOCBONDRELEASE, SIOCBONDSETHWADDR, SIOCBONDCHANGEACTIVE,
  *  SIOCBONDSLAVEINFOQUERY, and SIOCBONDINFOQUERY
  *
  * * int (*ndo_eth_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
  *  Called for ethernet specific ioctls: SIOCGMIIPHY, SIOCGMIIREG,
  *  SIOCSMIIREG, SIOCSHWTSTAMP and SIOCGHWTSTAMP.
  *
  * 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 reasons; 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.
  *
  * void (*ndo_tx_timeout)(struct net_device *dev, unsigned int txqueue);
  *  Callback used when the transmitter has not made any progress
  *  for dev->watchdog ticks.
  *
  * void (*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.
  *
  * bool (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id)
  *  Return true if this device supports offload stats of this attr_id.
  *
  * int (*ndo_get_offload_stats)(int attr_id, const struct net_device *dev,
  *  void *attr_data)
  *  Get statistics for offload operations by attr_id. Write it into the
  *  attr_data pointer.
  *
  * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, __be16 proto, u16 vid);
  *  If device supports VLAN filtering this function is called when a
  *  VLAN id is registered.
  *
  * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, __be16 proto, u16 vid);
  *  If device supports 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, __be16 proto);
  * 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_set_vf_trust)(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[]);
  *
  *      Enable or disable the VF ability to query its RSS Redirection Table and
  *      Hash Key. This is needed since on some devices VF share this information
  *      with PF and querying it may introduce a theoretical security risk.
  * int (*ndo_set_vf_rss_query_en)(struct net_device *dev, int vf, bool setting);
  * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
  * int (*ndo_setup_tc)(struct net_device *dev, enum tc_setup_type type,
  *             void *type_data);
  *  Called to setup any 'tc' scheduler, classifier or action on @dev.
  *  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.
  *
  * struct net_device *(*ndo_get_xmit_slave)(struct net_device *dev,
  *                      struct sk_buff *skb,
  *                      bool all_slaves);
  *  Get the xmit slave of master device. If all_slaves is true, function
  *  assume all the slaves can transmit.
  *
  *      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 vid, u16 flags,
  *            struct netlink_ext_ack *extack);
  *  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, u16 vid)
  *  Deletes the FDB entry from dev coresponding to addr.
  * int (*ndo_fdb_del_bulk)(struct ndmsg *ndm, struct nlattr *tb[],
  *             struct net_device *dev,
  *             u16 vid,
  *             struct netlink_ext_ack *extack);
  * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
  *             struct net_device *dev, struct net_device *filter_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,
  *               u16 flags, struct netlink_ext_ack *extack)
  * int (*ndo_bridge_getlink)(struct sk_buff *skb, u32 pid, u32 seq,
  *               struct net_device *dev, u32 filter_mask,
  *               int nlflags)
  * int (*ndo_bridge_dellink)(struct net_device *dev, struct nlmsghdr *nlh,
  *               u16 flags);
  *
  * 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_item_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.
  *
  * int (*ndo_get_port_parent_id)(struct net_device *dev,
  *               struct netdev_phys_item_id *ppid)
  *  Called to get the parent ID of the physical port of this device.
  *
  * 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.
  * int (*ndo_set_tx_maxrate)(struct net_device *dev,
  *               int queue_index, u32 maxrate);
  *  Called when a user wants to set a max-rate limitation of specific
  *  TX queue.
  * int (*ndo_get_iflink)(const struct net_device *dev);
  *  Called to get the iflink value of this device.
  * int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb);
  *  This function is used to get egress tunnel information for given skb.
  *  This is useful for retrieving outer tunnel header parameters while
  *  sampling packet.
  * void (*ndo_set_rx_headroom)(struct net_device *dev, int needed_headroom);
  *  This function is used to specify the headroom that the skb must
  *  consider when allocation skb during packet reception. Setting
  *  appropriate rx headroom value allows avoiding skb head copy on
  *  forward. Setting a negative value resets the rx headroom to the
  *  default value.
  * int (*ndo_bpf)(struct net_device *dev, struct netdev_bpf *bpf);
  *  This function is used to set or query state related to XDP on the
  *  netdevice and manage BPF offload. See definition of
  *  enum bpf_netdev_command for details.
  * int (*ndo_xdp_xmit)(struct net_device *dev, int n, struct xdp_frame **xdp,
  *          u32 flags);
  *  This function is used to submit @n XDP packets for transmit on a
  *  netdevice. Returns number of frames successfully transmitted, frames
  *  that got dropped are freed/returned via xdp_return_frame().
  *  Returns negative number, means general error invoking ndo, meaning
  *  no frames were xmit'ed and core-caller will free all frames.
  * struct net_device *(*ndo_xdp_get_xmit_slave)(struct net_device *dev,
  *                          struct xdp_buff *xdp);
  *      Get the xmit slave of master device based on the xdp_buff.
  * int (*ndo_xsk_wakeup)(struct net_device *dev, u32 queue_id, u32 flags);
  *      This function is used to wake up the softirq, ksoftirqd or kthread
  *  responsible for sending and/or receiving packets on a specific
  *  queue id bound to an AF_XDP socket. The flags field specifies if
  *  only RX, only Tx, or both should be woken up using the flags
  *  XDP_WAKEUP_RX and XDP_WAKEUP_TX.
  * struct devlink_port *(*ndo_get_devlink_port)(struct net_device *dev);
  *  Get devlink port instance associated with a given netdev.
  *  Called with a reference on the netdevice and devlink locks only,
  *  rtnl_lock is not held.
  * int (*ndo_tunnel_ctl)(struct net_device *dev, struct ip_tunnel_parm *p,
  *           int cmd);
  *  Add, change, delete or get information on an IPv4 tunnel.
  * struct net_device *(*ndo_get_peer_dev)(struct net_device *dev);
  *  If a device is paired with a peer device, return the peer instance.
  *  The caller must be under RCU read context.
  * int (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx, struct net_device_path *path);
  *     Get the forwarding path to reach the real device from the HW destination address
  * ktime_t (*ndo_get_tstamp)(struct net_device *dev,
  *               const struct skb_shared_hwtstamps *hwtstamps,
  *               bool cycles);
  *  Get hardware timestamp based on normal/adjustable time or free running
  *  cycle counter. This function is required if physical clock supports a
  *  free running cycle counter.
  */
 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);
     netdev_features_t   (*ndo_features_check)(struct sk_buff *skb,
                               struct net_device *dev,
                               netdev_features_t features);
     u16         (*ndo_select_queue)(struct net_device *dev,
                             struct sk_buff *skb,
                             struct net_device *sb_dev);
     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_eth_ioctl)(struct net_device *dev,
                          struct ifreq *ifr, int cmd);
     int         (*ndo_siocbond)(struct net_device *dev,
                         struct ifreq *ifr, int cmd);
     int         (*ndo_siocwandev)(struct net_device *dev,
                           struct if_settings *ifs);
     int         (*ndo_siocdevprivate)(struct net_device *dev,
                               struct ifreq *ifr,
                               void __user *data, 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,
                            unsigned int txqueue);
 
     void            (*ndo_get_stats64)(struct net_device *dev,
                            struct rtnl_link_stats64 *storage);
     bool            (*ndo_has_offload_stats)(const struct net_device *dev, int attr_id);
     int         (*ndo_get_offload_stats)(int attr_id,
                              const struct net_device *dev,
                              void *attr_data);
     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
     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, __be16 proto);
     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_set_vf_trust)(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_get_vf_stats)(struct net_device *dev,
                             int vf,
                             struct ifla_vf_stats
                             *vf_stats);
     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_get_vf_guid)(struct net_device *dev,
                            int vf,
                            struct ifla_vf_guid *node_guid,
                            struct ifla_vf_guid *port_guid);
     int         (*ndo_set_vf_guid)(struct net_device *dev,
                            int vf, u64 guid,
                            int guid_type);
     int         (*ndo_set_vf_rss_query_en)(
                            struct net_device *dev,
                            int vf, bool setting);
     int         (*ndo_setup_tc)(struct net_device *dev,
                         enum tc_setup_type type,
                         void *type_data);
 #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,
                          struct netlink_ext_ack *extack);
     int         (*ndo_del_slave)(struct net_device *dev,
                          struct net_device *slave_dev);
     struct net_device*  (*ndo_get_xmit_slave)(struct net_device *dev,
                               struct sk_buff *skb,
                               bool all_slaves);
     struct net_device*  (*ndo_sk_get_lower_dev)(struct net_device *dev,
                             struct sock *sk);
     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 net_device *dev,
                                struct neighbour *n);
     void            (*ndo_neigh_destroy)(struct net_device *dev,
                              struct neighbour *n);
 
     int         (*ndo_fdb_add)(struct ndmsg *ndm,
                            struct nlattr *tb[],
                            struct net_device *dev,
                            const unsigned char *addr,
                            u16 vid,
                            u16 flags,
                            struct netlink_ext_ack *extack);
     int         (*ndo_fdb_del)(struct ndmsg *ndm,
                            struct nlattr *tb[],
                            struct net_device *dev,
                            const unsigned char *addr,
                            u16 vid, struct netlink_ext_ack *extack);
     int         (*ndo_fdb_del_bulk)(struct ndmsg *ndm,
                             struct nlattr *tb[],
                             struct net_device *dev,
                             u16 vid,
                             struct netlink_ext_ack *extack);
     int         (*ndo_fdb_dump)(struct sk_buff *skb,
                         struct netlink_callback *cb,
                         struct net_device *dev,
                         struct net_device *filter_dev,
                         int *idx);
     int         (*ndo_fdb_get)(struct sk_buff *skb,
                            struct nlattr *tb[],
                            struct net_device *dev,
                            const unsigned char *addr,
                            u16 vid, u32 portid, u32 seq,
                            struct netlink_ext_ack *extack);
     int         (*ndo_bridge_setlink)(struct net_device *dev,
                               struct nlmsghdr *nlh,
                               u16 flags,
                               struct netlink_ext_ack *extack);
     int         (*ndo_bridge_getlink)(struct sk_buff *skb,
                               u32 pid, u32 seq,
                               struct net_device *dev,
                               u32 filter_mask,
                               int nlflags);
     int         (*ndo_bridge_dellink)(struct net_device *dev,
                               struct nlmsghdr *nlh,
                               u16 flags);
     int         (*ndo_change_carrier)(struct net_device *dev,
                               bool new_carrier);
     int         (*ndo_get_phys_port_id)(struct net_device *dev,
                             struct netdev_phys_item_id *ppid);
     int         (*ndo_get_port_parent_id)(struct net_device *dev,
                               struct netdev_phys_item_id *ppid);
     int         (*ndo_get_phys_port_name)(struct net_device *dev,
                               char *name, size_t len);
     void*           (*ndo_dfwd_add_station)(struct net_device *pdev,
                             struct net_device *dev);
     void            (*ndo_dfwd_del_station)(struct net_device *pdev,
                             void *priv);
 
     int         (*ndo_set_tx_maxrate)(struct net_device *dev,
                               int queue_index,
                               u32 maxrate);
     int         (*ndo_get_iflink)(const struct net_device *dev);
     int         (*ndo_fill_metadata_dst)(struct net_device *dev,
                                struct sk_buff *skb);
     void            (*ndo_set_rx_headroom)(struct net_device *dev,
                                int needed_headroom);
     int         (*ndo_bpf)(struct net_device *dev,
                        struct netdev_bpf *bpf);
     int         (*ndo_xdp_xmit)(struct net_device *dev, int n,
                         struct xdp_frame **xdp,
                         u32 flags);
     struct net_device * (*ndo_xdp_get_xmit_slave)(struct net_device *dev,
                               struct xdp_buff *xdp);
     int         (*ndo_xsk_wakeup)(struct net_device *dev,
                           u32 queue_id, u32 flags);
     struct devlink_port *   (*ndo_get_devlink_port)(struct net_device *dev);
     int         (*ndo_tunnel_ctl)(struct net_device *dev,
                           struct ip_tunnel_parm *p, int cmd);
     struct net_device * (*ndo_get_peer_dev)(struct net_device *dev);
     int                     (*ndo_fill_forward_path)(struct net_device_path_ctx *ctx,
                                                          struct net_device_path *path);
     ktime_t         (*ndo_get_tstamp)(struct net_device *dev,
                           const struct skb_shared_hwtstamps *hwtstamps,
                           bool cycles);
 };
 
 /**
  * enum netdev_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_BONDING: bonding master or slave
  * @IFF_ISATAP: ISATAP interface (RFC4214)
  * @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
  * @IFF_XMIT_DST_RELEASE_PERM: IFF_XMIT_DST_RELEASE not taking into account
  *  underlying stacked devices
  * @IFF_L3MDEV_MASTER: device is an L3 master device
  * @IFF_NO_QUEUE: device can run without qdisc attached
  * @IFF_OPENVSWITCH: device is a Open vSwitch master
  * @IFF_L3MDEV_SLAVE: device is enslaved to an L3 master device
  * @IFF_TEAM: device is a team device
  * @IFF_RXFH_CONFIGURED: device has had Rx Flow indirection table configured
  * @IFF_PHONY_HEADROOM: the headroom value is controlled by an external
  *  entity (i.e. the master device for bridged veth)
  * @IFF_MACSEC: device is a MACsec device
  * @IFF_NO_RX_HANDLER: device doesn't support the rx_handler hook
  * @IFF_FAILOVER: device is a failover master device
  * @IFF_FAILOVER_SLAVE: device is lower dev of a failover master device
  * @IFF_L3MDEV_RX_HANDLER: only invoke the rx handler of L3 master device
  * @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running
  * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with
  *  skb_headlen(skb) == 0 (data starts from frag0)
  * @IFF_CHANGE_PROTO_DOWN: device supports setting carrier via IFLA_PROTO_DOWN
  */
 enum netdev_priv_flags {
     IFF_802_1Q_VLAN         = 1<<0,
     IFF_EBRIDGE         = 1<<1,
     IFF_BONDING         = 1<<2,
     IFF_ISATAP          = 1<<3,
     IFF_WAN_HDLC            = 1<<4,
     IFF_XMIT_DST_RELEASE        = 1<<5,
     IFF_DONT_BRIDGE         = 1<<6,
     IFF_DISABLE_NETPOLL     = 1<<7,
     IFF_MACVLAN_PORT        = 1<<8,
     IFF_BRIDGE_PORT         = 1<<9,
     IFF_OVS_DATAPATH        = 1<<10,
     IFF_TX_SKB_SHARING      = 1<<11,
     IFF_UNICAST_FLT         = 1<<12,
     IFF_TEAM_PORT           = 1<<13,
     IFF_SUPP_NOFCS          = 1<<14,
     IFF_LIVE_ADDR_CHANGE        = 1<<15,
     IFF_MACVLAN         = 1<<16,
     IFF_XMIT_DST_RELEASE_PERM   = 1<<17,
     IFF_L3MDEV_MASTER       = 1<<18,
     IFF_NO_QUEUE            = 1<<19,
     IFF_OPENVSWITCH         = 1<<20,
     IFF_L3MDEV_SLAVE        = 1<<21,
     IFF_TEAM            = 1<<22,
     IFF_RXFH_CONFIGURED     = 1<<23,
     IFF_PHONY_HEADROOM      = 1<<24,
     IFF_MACSEC          = 1<<25,
     IFF_NO_RX_HANDLER       = 1<<26,
     IFF_FAILOVER            = 1<<27,
     IFF_FAILOVER_SLAVE      = 1<<28,
     IFF_L3MDEV_RX_HANDLER       = 1<<29,
     IFF_LIVE_RENAME_OK      = 1<<30,
     IFF_TX_SKB_NO_LINEAR        = BIT_ULL(31),
     IFF_CHANGE_PROTO_DOWN       = BIT_ULL(32),
 };
 
 #define IFF_802_1Q_VLAN         IFF_802_1Q_VLAN
 #define IFF_EBRIDGE         IFF_EBRIDGE
 #define IFF_BONDING         IFF_BONDING
 #define IFF_ISATAP          IFF_ISATAP
 #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
 #define IFF_XMIT_DST_RELEASE_PERM   IFF_XMIT_DST_RELEASE_PERM
 #define IFF_L3MDEV_MASTER       IFF_L3MDEV_MASTER
 #define IFF_NO_QUEUE            IFF_NO_QUEUE
 #define IFF_OPENVSWITCH         IFF_OPENVSWITCH
 #define IFF_L3MDEV_SLAVE        IFF_L3MDEV_SLAVE
 #define IFF_TEAM            IFF_TEAM
 #define IFF_RXFH_CONFIGURED     IFF_RXFH_CONFIGURED
 #define IFF_PHONY_HEADROOM      IFF_PHONY_HEADROOM
 #define IFF_MACSEC          IFF_MACSEC
 #define IFF_NO_RX_HANDLER       IFF_NO_RX_HANDLER
 #define IFF_FAILOVER            IFF_FAILOVER
 #define IFF_FAILOVER_SLAVE      IFF_FAILOVER_SLAVE
 #define IFF_L3MDEV_RX_HANDLER       IFF_L3MDEV_RX_HANDLER
 #define IFF_LIVE_RENAME_OK      IFF_LIVE_RENAME_OK
 #define IFF_TX_SKB_NO_LINEAR        IFF_TX_SKB_NO_LINEAR
 
 /* Specifies the type of the struct net_device::ml_priv pointer */
 enum netdev_ml_priv_type {
     ML_PRIV_NONE,
     ML_PRIV_CAN,
 };
 
 /**
  *  struct net_device - 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.
  *
  *  @name:  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.
  *
  *  @name_node: Name hashlist node
  *  @ifalias:   SNMP alias
  *  @mem_end:   Shared memory end
  *  @mem_start: Shared memory start
  *  @base_addr: Device I/O address
  *  @irq:       Device IRQ number
  *
  *  @state:     Generic network queuing layer state, see netdev_state_t
  *  @dev_list:  The global list of network devices
  *  @napi_list: List entry used for polling NAPI devices
  *  @unreg_list:    List entry  when we are unregistering the
  *          device; see the function unregister_netdev
  *  @close_list:    List entry used when we are closing the device
  *  @ptype_all:     Device-specific packet handlers for all protocols
  *  @ptype_specific: Device-specific, protocol-specific packet handlers
  *
  *  @adj_list:  Directly linked devices, like slaves for bonding
  *  @features:  Currently active device features
  *  @hw_features:   User-changeable features
  *
  *  @wanted_features:   User-requested features
  *  @vlan_features:     Mask of features inheritable by VLAN devices
  *
  *  @hw_enc_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.
  *
  *  @mpls_features: Mask of features inheritable by MPLS
  *  @gso_partial_features: value(s) from NETIF_F_GSO\*
  *
  *  @ifindex:   interface index
  *  @group:     The group the device belongs to
  *
  *  @stats:     Statistics struct, which was left as a legacy, use
  *          rtnl_link_stats64 instead
  *
  *  @core_stats:    core networking counters,
  *          do not use this in drivers
  *  @carrier_up_count:  Number of times the carrier has been up
  *  @carrier_down_count:    Number of times the carrier has been down
  *
  *  @wireless_handlers: List of functions to handle Wireless Extensions,
  *              instead of ioctl,
  *              see <net/iw_handler.h> for details.
  *  @wireless_data: Instance data managed by the core of wireless extensions
  *
  *  @netdev_ops:    Includes several pointers to callbacks,
  *          if one wants to override the ndo_*() functions
  *  @ethtool_ops:   Management operations
  *  @l3mdev_ops:    Layer 3 master device operations
  *  @ndisc_ops: Includes callbacks for different IPv6 neighbour
  *          discovery handling. Necessary for e.g. 6LoWPAN.
  *  @xfrmdev_ops:   Transformation offload operations
  *  @tlsdev_ops:    Transport Layer Security offload operations
  *  @header_ops:    Includes callbacks for creating,parsing,caching,etc
  *          of Layer 2 headers.
  *
  *  @flags:     Interface flags (a la BSD)
  *  @priv_flags:    Like 'flags' but invisible to userspace,
  *          see if.h for the definitions
  *  @gflags:    Global flags ( kept as legacy )
  *  @padded:    How much padding added by alloc_netdev()
  *  @operstate: RFC2863 operstate
  *  @link_mode: Mapping policy to operstate
  *  @if_port:   Selectable AUI, TP, ...
  *  @dma:       DMA channel
  *  @mtu:       Interface MTU value
  *  @min_mtu:   Interface Minimum MTU value
  *  @max_mtu:   Interface Maximum MTU value
  *  @type:      Interface hardware type
  *  @hard_header_len: Maximum hardware header length.
  *  @min_header_len:  Minimum hardware header length
  *
  *  @needed_headroom: Extra headroom the hardware may need, but not in all
  *            cases can this be guaranteed
  *  @needed_tailroom: Extra tailroom the hardware may need, but not in all
  *            cases can this be guaranteed. Some cases also use
  *            LL_MAX_HEADER instead to allocate the skb
  *
  *  interface address info:
  *
  *  @perm_addr:     Permanent hw address
  *  @addr_assign_type:  Hw address assignment type
  *  @addr_len:      Hardware address length
  *  @upper_level:       Maximum depth level of upper devices.
  *  @lower_level:       Maximum depth level of lower devices.
  *  @neigh_priv_len:    Used in neigh_alloc()
  *  @dev_id:        Used to differentiate devices that share
  *              the same link layer address
  *  @dev_port:      Used to differentiate devices that share
  *              the same function
  *  @addr_list_lock:    XXX: need comments on this one
  *  @name_assign_type:  network interface name assignment type
  *  @uc_promisc:        Counter that indicates promiscuous mode
  *              has been enabled due to the need to listen to
  *              additional unicast addresses in a device that
  *              does not implement ndo_set_rx_mode()
  *  @uc:            unicast mac addresses
  *  @mc:            multicast mac addresses
  *  @dev_addrs:     list of device hw addresses
  *  @queues_kset:       Group of all Kobjects in the Tx and RX queues
  *  @promiscuity:       Number of times the NIC is told to work in
  *              promiscuous mode; if it becomes 0 the NIC will
  *              exit promiscuous mode
  *  @allmulti:      Counter, enables or disables allmulticast mode
  *
  *  @vlan_info: VLAN info
  *  @dsa_ptr:   dsa specific data
  *  @tipc_ptr:  TIPC specific data
  *  @atalk_ptr: AppleTalk link
  *  @ip_ptr:    IPv4 specific data
  *  @dn_ptr:    DECnet specific data
  *  @ip6_ptr:   IPv6 specific data
  *  @ax25_ptr:  AX.25 specific data
  *  @ieee80211_ptr: IEEE 802.11 specific data, assign before registering
  *  @ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network
  *           device struct
  *  @mpls_ptr:  mpls_dev struct pointer
  *  @mctp_ptr:  MCTP specific data
  *
  *  @dev_addr:  Hw address (before bcast,
  *          because most packets are unicast)
  *
  *  @_rx:           Array of RX queues
  *  @num_rx_queues:     Number of RX queues
  *              allocated at register_netdev() time
  *  @real_num_rx_queues:    Number of RX queues currently active in device
  *  @xdp_prog:      XDP sockets filter program pointer
  *  @gro_flush_timeout: timeout for GRO layer in NAPI
  *  @napi_defer_hard_irqs:  If not zero, provides a counter that would
  *              allow to avoid NIC hard IRQ, on busy queues.
  *
  *  @rx_handler:        handler for received packets
  *  @rx_handler_data:   XXX: need comments on this one
  *  @miniq_ingress:     ingress/clsact qdisc specific data for
  *              ingress processing
  *  @ingress_queue:     XXX: need comments on this one
  *  @nf_hooks_ingress:  netfilter hooks executed for ingress packets
  *  @broadcast:     hw bcast address
  *
  *  @rx_cpu_rmap:   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
  *  @index_hlist:       Device index hash chain
  *
  *  @_tx:           Array of TX queues
  *  @num_tx_queues:     Number of TX queues allocated at alloc_netdev_mq() time
  *  @real_num_tx_queues:    Number of TX queues currently active in device
  *  @qdisc:         Root qdisc from userspace point of view
  *  @tx_queue_len:      Max frames per queue allowed
  *  @tx_global_lock:    XXX: need comments on this one
  *  @xdp_bulkq:     XDP device bulk queue
  *  @xps_maps:      all CPUs/RXQs maps for XPS device
  *
  *  @xps_maps:  XXX: need comments on this one
  *  @miniq_egress:      clsact qdisc specific data for
  *              egress processing
  *  @nf_hooks_egress:   netfilter hooks executed for egress packets
  *  @qdisc_hash:        qdisc hash table
  *  @watchdog_timeo:    Represents the timeout that is used by
  *              the watchdog (see dev_watchdog())
  *  @watchdog_timer:    List of timers
  *
  *  @proto_down_reason: reason a netdev interface is held down
  *  @pcpu_refcnt:       Number of references to this device
  *  @dev_refcnt:        Number of references to this device
  *  @refcnt_tracker:    Tracker directory for tracked references to this device
  *  @todo_list:     Delayed register/unregister
  *  @link_watch_list:   XXX: need comments on this one
  *
  *  @reg_state:     Register/unregister state machine
  *  @dismantle:     Device is going to be freed
  *  @rtnl_link_state:   This enum represents the phases of creating
  *              a new link
  *
  *  @needs_free_netdev: Should unregister perform free_netdev?
  *  @priv_destructor:   Called from unregister
  *  @npinfo:        XXX: need comments on this one
  *  @nd_net:        Network namespace this network device is inside
  *
  *  @ml_priv:   Mid-layer private
  *  @ml_priv_type:  Mid-layer private type
  *  @lstats:    Loopback statistics
  *  @tstats:    Tunnel statistics
  *  @dstats:    Dummy statistics
  *  @vstats:    Virtual ethernet statistics
  *
  *  @garp_port: GARP
  *  @mrp_port:  MRP
  *
  *  @dm_private:    Drop monitor private
  *
  *  @dev:       Class/net/name entry
  *  @sysfs_groups:  Space for optional device, statistics and wireless
  *          sysfs groups
  *
  *  @sysfs_rx_queue_group:  Space for optional per-rx queue attributes
  *  @rtnl_link_ops: Rtnl_link_ops
  *
  *  @gso_max_size:  Maximum size of generic segmentation offload
  *  @tso_max_size:  Device (as in HW) limit on the max TSO request size
  *  @gso_max_segs:  Maximum number of segments that can be passed to the
  *          NIC for GSO
  *  @tso_max_segs:  Device (as in HW) limit on the max TSO segment count
  *
  *  @dcbnl_ops: Data Center Bridging netlink ops
  *  @num_tc:    Number of traffic classes in the net device
  *  @tc_to_txq: XXX: need comments on this one
  *  @prio_tc_map:   XXX: need comments on this one
  *
  *  @fcoe_ddp_xid:  Max exchange id for FCoE LRO by ddp
  *
  *  @priomap:   XXX: need comments on this one
  *  @phydev:    Physical device may attach itself
  *          for hardware timestamping
  *  @sfp_bus:   attached &struct sfp_bus structure.
  *
  *  @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
  *
  *  @proto_down:    protocol port state information can be sent to the
  *          switch driver and used to set the phys state of the
  *          switch port.
  *
  *  @wol_enabled:   Wake-on-LAN is enabled
  *
  *  @threaded:  napi threaded mode is enabled
  *
  *  @net_notifier_list: List of per-net netdev notifier block
  *              that follow this device when it is moved
  *              to another network namespace.
  *
  *  @macsec_ops:    MACsec offloading ops
  *
  *  @udp_tunnel_nic_info:   static structure describing the UDP tunnel
  *              offload capabilities of the device
  *  @udp_tunnel_nic:    UDP tunnel offload state
  *  @xdp_state:     stores info on attached XDP BPF programs
  *
  *  @nested_level:  Used as a parameter of spin_lock_nested() of
  *          dev->addr_list_lock.
  *  @unlink_list:   As netif_addr_lock() can be called recursively,
  *          keep a list of interfaces to be deleted.
  *  @gro_max_size:  Maximum size of aggregated packet in generic
  *          receive offload (GRO)
  *
  *  @dev_addr_shadow:   Copy of @dev_addr to catch direct writes.
  *  @linkwatch_dev_tracker: refcount tracker used by linkwatch.
  *  @watchdog_dev_tracker:  refcount tracker used by watchdog.
  *  @dev_registered_tracker:    tracker for reference held while
  *                  registered
  *  @offload_xstats_l3: L3 HW stats for this netdevice.
  *
  *  FIXME: cleanup struct net_device such that network protocol info
  *  moves out.
  */
 
 struct net_device {
     char            name[IFNAMSIZ];
     struct netdev_name_node *name_node;
     struct dev_ifalias  __rcu *ifalias;
     /*
      *  I/O specific fields
      *  FIXME: Merge these and struct ifmap into one
      */
     unsigned long       mem_end;
     unsigned long       mem_start;
     unsigned long       base_addr;
 
     /*
      *  Some hardware also needs these fields (state,dev_list,
      *  napi_list,unreg_list,close_list) 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;
     struct list_head    ptype_all;
     struct list_head    ptype_specific;
 
     struct {
         struct list_head upper;
         struct list_head lower;
     } adj_list;
 
     /* Read-mostly cache-line for fast-path access */
     unsigned int        flags;
     unsigned long long  priv_flags;
     const struct net_device_ops *netdev_ops;
     int         ifindex;
     unsigned short      gflags;
     unsigned short      hard_header_len;
 
     /* Note : dev->mtu is often read without holding a lock.
      * Writers usually hold RTNL.
      * It is recommended to use READ_ONCE() to annotate the reads,
      * and to use WRITE_ONCE() to annotate the writes.
      */
     unsigned int        mtu;
     unsigned short      needed_headroom;
     unsigned short      needed_tailroom;
 
     netdev_features_t   features;
     netdev_features_t   hw_features;
     netdev_features_t   wanted_features;
     netdev_features_t   vlan_features;
     netdev_features_t   hw_enc_features;
     netdev_features_t   mpls_features;
     netdev_features_t   gso_partial_features;
 
     unsigned int        min_mtu;
     unsigned int        max_mtu;
     unsigned short      type;
     unsigned char       min_header_len;
     unsigned char       name_assign_type;
 
     int         group;
 
     struct net_device_stats stats; /* not used by modern drivers */
 
     struct net_device_core_stats __percpu *core_stats;
 
     /* Stats to monitor link on/off, flapping */
     atomic_t        carrier_up_count;
     atomic_t        carrier_down_count;
 
 #ifdef CONFIG_WIRELESS_EXT
     const struct iw_handler_def *wireless_handlers;
     struct iw_public_data   *wireless_data;
 #endif
     const struct ethtool_ops *ethtool_ops;
 #ifdef CONFIG_NET_L3_MASTER_DEV
     const struct l3mdev_ops *l3mdev_ops;
 #endif
 #if IS_ENABLED(CONFIG_IPV6)
     const struct ndisc_ops *ndisc_ops;
 #endif
 
 #ifdef CONFIG_XFRM_OFFLOAD
     const struct xfrmdev_ops *xfrmdev_ops;
 #endif
 
 #if IS_ENABLED(CONFIG_TLS_DEVICE)
     const struct tlsdev_ops *tlsdev_ops;
 #endif
 
     const struct header_ops *header_ops;
 
     unsigned char       operstate;
     unsigned char       link_mode;
 
     unsigned char       if_port;
     unsigned char       dma;
 
     /* Interface address info. */
     unsigned char       perm_addr[MAX_ADDR_LEN];
     unsigned char       addr_assign_type;
     unsigned char       addr_len;
     unsigned char       upper_level;
     unsigned char       lower_level;
 
     unsigned short      neigh_priv_len;
     unsigned short          dev_id;
     unsigned short          dev_port;
     unsigned short      padded;
 
     spinlock_t      addr_list_lock;
     int         irq;
 
     struct netdev_hw_addr_list  uc;
     struct netdev_hw_addr_list  mc;
     struct netdev_hw_addr_list  dev_addrs;
 
 #ifdef CONFIG_SYSFS
     struct kset     *queues_kset;
 #endif
 #ifdef CONFIG_LOCKDEP
     struct list_head    unlink_list;
 #endif
     unsigned int        promiscuity;
     unsigned int        allmulti;
     bool            uc_promisc;
 #ifdef CONFIG_LOCKDEP
     unsigned char       nested_level;
 #endif
 
 
     /* Protocol-specific pointers */
 
     struct in_device __rcu  *ip_ptr;
     struct inet6_dev __rcu  *ip6_ptr;
 #if IS_ENABLED(CONFIG_VLAN_8021Q)
     struct vlan_info __rcu  *vlan_info;
 #endif
 #if IS_ENABLED(CONFIG_NET_DSA)
     struct dsa_port     *dsa_ptr;
 #endif
 #if IS_ENABLED(CONFIG_TIPC)
     struct tipc_bearer __rcu *tipc_ptr;
 #endif
 #if IS_ENABLED(CONFIG_ATALK)
     void            *atalk_ptr;
 #endif
 #if IS_ENABLED(CONFIG_DECNET)
     struct dn_dev __rcu     *dn_ptr;
 #endif
 #if IS_ENABLED(CONFIG_AX25)
     void            *ax25_ptr;
 #endif
 #if IS_ENABLED(CONFIG_CFG80211)
     struct wireless_dev *ieee80211_ptr;
 #endif
 #if IS_ENABLED(CONFIG_IEEE802154) || IS_ENABLED(CONFIG_6LOWPAN)
     struct wpan_dev     *ieee802154_ptr;
 #endif
 #if IS_ENABLED(CONFIG_MPLS_ROUTING)
     struct mpls_dev __rcu   *mpls_ptr;
 #endif
 #if IS_ENABLED(CONFIG_MCTP)
     struct mctp_dev __rcu   *mctp_ptr;
 #endif
 
 /*
  * Cache lines mostly used on receive path (including eth_type_trans())
  */
     /* Interface address info used in eth_type_trans() */
     const unsigned char *dev_addr;
 
     struct netdev_rx_queue  *_rx;
     unsigned int        num_rx_queues;
     unsigned int        real_num_rx_queues;
 
     struct bpf_prog __rcu   *xdp_prog;
     unsigned long       gro_flush_timeout;
     int         napi_defer_hard_irqs;
 #define GRO_LEGACY_MAX_SIZE 65536u
 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE),
  * and shinfo->gso_segs is a 16bit field.
  */
 #define GRO_MAX_SIZE        (8 * 65535u)
     unsigned int        gro_max_size;
     rx_handler_func_t __rcu *rx_handler;
     void __rcu      *rx_handler_data;
 
 #ifdef CONFIG_NET_CLS_ACT
     struct mini_Qdisc __rcu *miniq_ingress;
 #endif
     struct netdev_queue __rcu *ingress_queue;
 #ifdef CONFIG_NETFILTER_INGRESS
     struct nf_hook_entries __rcu *nf_hooks_ingress;
 #endif
 
     unsigned char       broadcast[MAX_ADDR_LEN];
 #ifdef CONFIG_RFS_ACCEL
     struct cpu_rmap     *rx_cpu_rmap;
 #endif
     struct hlist_node   index_hlist;
 
 /*
  * Cache lines mostly used on transmit path
  */
     struct netdev_queue *_tx ____cacheline_aligned_in_smp;
     unsigned int        num_tx_queues;
     unsigned int        real_num_tx_queues;
     struct Qdisc __rcu  *qdisc;
     unsigned int        tx_queue_len;
     spinlock_t      tx_global_lock;
 
     struct xdp_dev_bulk_queue __percpu *xdp_bulkq;
 
 #ifdef CONFIG_XPS
     struct xps_dev_maps __rcu *xps_maps[XPS_MAPS_MAX];
 #endif
 #ifdef CONFIG_NET_CLS_ACT
     struct mini_Qdisc __rcu *miniq_egress;
 #endif
 #ifdef CONFIG_NETFILTER_EGRESS
     struct nf_hook_entries __rcu *nf_hooks_egress;
 #endif
 
 #ifdef CONFIG_NET_SCHED
     DECLARE_HASHTABLE   (qdisc_hash, 4);
 #endif
     /* These may be needed for future network-power-down code. */
     struct timer_list   watchdog_timer;
     int         watchdog_timeo;
 
     u32                     proto_down_reason;
 
     struct list_head    todo_list;
 
 #ifdef CONFIG_PCPU_DEV_REFCNT
     int __percpu        *pcpu_refcnt;
 #else
     refcount_t      dev_refcnt;
 #endif
     struct ref_tracker_dir  refcnt_tracker;
 
     struct list_head    link_watch_list;
 
     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;
 
     enum {
         RTNL_LINK_INITIALIZED,
         RTNL_LINK_INITIALIZING,
     } rtnl_link_state:16;
 
     bool needs_free_netdev;
     void (*priv_destructor)(struct net_device *dev);
 
 #ifdef CONFIG_NETPOLL
     struct netpoll_info __rcu   *npinfo;
 #endif
 
     possible_net_t          nd_net;
 
     /* mid-layer private */
     void                *ml_priv;
     enum netdev_ml_priv_type    ml_priv_type;
 
     union {
         struct pcpu_lstats __percpu     *lstats;
         struct pcpu_sw_netstats __percpu    *tstats;
         struct pcpu_dstats __percpu     *dstats;
     };
 
 #if IS_ENABLED(CONFIG_GARP)
     struct garp_port __rcu  *garp_port;
 #endif
 #if IS_ENABLED(CONFIG_MRP)
     struct mrp_port __rcu   *mrp_port;
 #endif
 #if IS_ENABLED(CONFIG_NET_DROP_MONITOR)
     struct dm_hw_stat_delta __rcu *dm_private;
 #endif
     struct device       dev;
     const struct attribute_group *sysfs_groups[4];
     const struct attribute_group *sysfs_rx_queue_group;
 
     const struct rtnl_link_ops *rtnl_link_ops;
 
     /* for setting kernel sock attribute on TCP connection setup */
 #define GSO_MAX_SEGS        65535u
 #define GSO_LEGACY_MAX_SIZE 65536u
 /* TCP minimal MSS is 8 (TCP_MIN_GSO_SIZE),
  * and shinfo->gso_segs is a 16bit field.
  */
 #define GSO_MAX_SIZE        (8 * GSO_MAX_SEGS)
 
     unsigned int        gso_max_size;
 #define TSO_LEGACY_MAX_SIZE 65536
 #define TSO_MAX_SIZE        UINT_MAX
     unsigned int        tso_max_size;
     u16         gso_max_segs;
 #define TSO_MAX_SEGS        U16_MAX
     u16         tso_max_segs;
 
 #ifdef CONFIG_DCB
     const struct dcbnl_rtnl_ops *dcbnl_ops;
 #endif
     s16         num_tc;
     struct netdev_tc_txq    tc_to_txq[TC_MAX_QUEUE];
     u8          prio_tc_map[TC_BITMASK + 1];
 
 #if IS_ENABLED(CONFIG_FCOE)
     unsigned int        fcoe_ddp_xid;
 #endif
 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
     struct netprio_map __rcu *priomap;
 #endif
     struct phy_device   *phydev;
     struct sfp_bus      *sfp_bus;
     struct lock_class_key   *qdisc_tx_busylock;
     bool            proto_down;
     unsigned        wol_enabled:1;
     unsigned        threaded:1;
 
     struct list_head    net_notifier_list;
 
 #if IS_ENABLED(CONFIG_MACSEC)
     /* MACsec management functions */
     const struct macsec_ops *macsec_ops;
 #endif
     const struct udp_tunnel_nic_info    *udp_tunnel_nic_info;
     struct udp_tunnel_nic   *udp_tunnel_nic;
 
     /* protected by rtnl_lock */
     struct bpf_xdp_entity   xdp_state[__MAX_XDP_MODE];
 
     u8 dev_addr_shadow[MAX_ADDR_LEN];
     netdevice_tracker   linkwatch_dev_tracker;
     netdevice_tracker   watchdog_dev_tracker;
     netdevice_tracker   dev_registered_tracker;
     struct rtnl_hw_stats64  *offload_xstats_l3;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)
 
 static inline bool netif_elide_gro(const struct net_device *dev)
 {
     if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
         return true;
     return false;
 }
 
 #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;
 }
 
 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq);
 void netdev_reset_tc(struct net_device *dev);
 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset);
 int netdev_set_num_tc(struct net_device *dev, u8 num_tc);
 
 static inline
 int netdev_get_num_tc(struct net_device *dev)
 {
     return dev->num_tc;
 }
 
 static inline void net_prefetch(void *p)
 {
     prefetch(p);
 #if L1_CACHE_BYTES < 128
     prefetch((u8 *)p + L1_CACHE_BYTES);
 #endif
 }
 
 static inline void net_prefetchw(void *p)
 {
     prefetchw(p);
 #if L1_CACHE_BYTES < 128
     prefetchw((u8 *)p + L1_CACHE_BYTES);
 #endif
 }
 
 void netdev_unbind_sb_channel(struct net_device *dev,
                   struct net_device *sb_dev);
 int netdev_bind_sb_channel_queue(struct net_device *dev,
                  struct net_device *sb_dev,
                  u8 tc, u16 count, u16 offset);
 int netdev_set_sb_channel(struct net_device *dev, u16 channel);
 static inline int netdev_get_sb_channel(struct net_device *dev)
 {
     return max_t(int, -dev->num_tc, 0);
 }
 
 static inline
 struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
                      unsigned int index)
 {
     return &dev->_tx[index];
 }
 
 static inline struct netdev_queue *skb_get_tx_queue(const struct net_device *dev,
                             const struct sk_buff *skb)
 {
     return netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
 }
 
 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);
 }
 
 #define netdev_lockdep_set_classes(dev)             \
 {                               \
     static struct lock_class_key qdisc_tx_busylock_key; \
     static struct lock_class_key qdisc_xmit_lock_key;   \
     static struct lock_class_key dev_addr_list_lock_key;    \
     unsigned int i;                     \
                                 \
     (dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key;  \
     lockdep_set_class(&(dev)->addr_list_lock,       \
               &dev_addr_list_lock_key);     \
     for (i = 0; i < (dev)->num_tx_queues; i++)      \
         lockdep_set_class(&(dev)->_tx[i]._xmit_lock,    \
                   &qdisc_xmit_lock_key);    \
 }
 
 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
              struct net_device *sb_dev);
 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
                      struct sk_buff *skb,
                      struct net_device *sb_dev);
 
 /* returns the headroom that the master device needs to take in account
  * when forwarding to this dev
  */
 static inline unsigned netdev_get_fwd_headroom(struct net_device *dev)
 {
     return dev->priv_flags & IFF_PHONY_HEADROOM ? 0 : dev->needed_headroom;
 }
 
 static inline void netdev_set_rx_headroom(struct net_device *dev, int new_hr)
 {
     if (dev->netdev_ops->ndo_set_rx_headroom)
         dev->netdev_ops->ndo_set_rx_headroom(dev, new_hr);
 }
 
 /* set the device rx headroom to the dev's default */
 static inline void netdev_reset_rx_headroom(struct net_device *dev)
 {
     netdev_set_rx_headroom(dev, -1);
 }
 
 static inline void *netdev_get_ml_priv(struct net_device *dev,
                        enum netdev_ml_priv_type type)
 {
     if (dev->ml_priv_type != type)
         return NULL;
 
     return dev->ml_priv;
 }
 
 static inline void netdev_set_ml_priv(struct net_device *dev,
                       void *ml_priv,
                       enum netdev_ml_priv_type type)
 {
     WARN(dev->ml_priv_type && dev->ml_priv_type != type,
          "Overwriting already set ml_priv_type (%u) with different ml_priv_type (%u)!\n",
          dev->ml_priv_type, type);
     WARN(!dev->ml_priv_type && dev->ml_priv,
          "Overwriting already set ml_priv and ml_priv_type is ML_PRIV_NONE!\n");
 
     dev->ml_priv = ml_priv;
     dev->ml_priv_type = type;
 }
 
 /*
  * 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)
 {
     write_pnet(&dev->nd_net, net);
 }
 
 /**
  *  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, Wireless 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
 
 void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi,
                int (*poll)(struct napi_struct *, int), int weight);
 
 /**
  * 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.
  */
 static inline void
 netif_napi_add(struct net_device *dev, struct napi_struct *napi,
            int (*poll)(struct napi_struct *, int), int weight)
 {
     netif_napi_add_weight(dev, napi, poll, weight);
 }
 
 static inline void
 netif_napi_add_tx_weight(struct net_device *dev,
              struct napi_struct *napi,
              int (*poll)(struct napi_struct *, int),
              int weight)
 {
     set_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state);
     netif_napi_add_weight(dev, napi, poll, weight);
 }
 
 #define netif_tx_napi_add netif_napi_add_tx_weight
 
 /**
  * netif_napi_add_tx() - initialize a NAPI context to be used for Tx only
  * @dev:  network device
  * @napi: NAPI context
  * @poll: polling function
  *
  * This variant of netif_napi_add() should be used from drivers using NAPI
  * to exclusively poll a TX queue.
  * This will avoid we add it into napi_hash[], thus polluting this hash table.
  */
 static inline void netif_napi_add_tx(struct net_device *dev,
                      struct napi_struct *napi,
                      int (*poll)(struct napi_struct *, int))
 {
     netif_napi_add_tx_weight(dev, napi, poll, NAPI_POLL_WEIGHT);
 }
 
 /**
  *  __netif_napi_del - remove a NAPI context
  *  @napi: NAPI context
  *
  * Warning: caller must observe RCU grace period before freeing memory
  * containing @napi. Drivers might want to call this helper to combine
  * all the needed RCU grace periods into a single one.
  */
 void __netif_napi_del(struct napi_struct *napi);
 
 /**
  *  netif_napi_del - remove a NAPI context
  *  @napi: NAPI context
  *
  *  netif_napi_del() removes a NAPI context from the network device NAPI list
  */
 static inline void netif_napi_del(struct napi_struct *napi)
 {
     __netif_napi_del(napi);
     synchronize_net();
 }
 
 struct packet_type {
     __be16          type;   /* This is really htons(ether_type). */
     bool            ignore_outgoing;
     struct net_device   *dev;   /* NULL is wildcarded here       */
     netdevice_tracker   dev_tracker;
     int         (*func) (struct sk_buff *,
                      struct net_device *,
                      struct packet_type *,
                      struct net_device *);
     void            (*list_func) (struct list_head *,
                           struct packet_type *,
                           struct net_device *);
     bool            (*id_match)(struct packet_type *ptype,
                         struct sock *sk);
     struct net      *af_packet_net;
     void            *af_packet_priv;
     struct list_head    list;
 };
 
 struct offload_callbacks {
     struct sk_buff      *(*gso_segment)(struct sk_buff *skb,
                         netdev_features_t features);
     struct sk_buff      *(*gro_receive)(struct list_head *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). */
     u16          priority;
     struct offload_callbacks callbacks;
     struct list_head     list;
 };
 
 /* often modified stats are per-CPU, other are shared (netdev->stats) */
 struct pcpu_sw_netstats {
     u64_stats_t     rx_packets;
     u64_stats_t     rx_bytes;
     u64_stats_t     tx_packets;
     u64_stats_t     tx_bytes;
     struct u64_stats_sync   syncp;
 } __aligned(4 * sizeof(u64));
 
 struct pcpu_lstats {
     u64_stats_t packets;
     u64_stats_t bytes;
     struct u64_stats_sync syncp;
 } __aligned(2 * sizeof(u64));
 
 void dev_lstats_read(struct net_device *dev, u64 *packets, u64 *bytes);
 
 static inline void dev_sw_netstats_rx_add(struct net_device *dev, unsigned int len)
 {
     struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 
     u64_stats_update_begin(&tstats->syncp);
     u64_stats_add(&tstats->rx_bytes, len);
     u64_stats_inc(&tstats->rx_packets);
     u64_stats_update_end(&tstats->syncp);
 }
 
 static inline void dev_sw_netstats_tx_add(struct net_device *dev,
                       unsigned int packets,
                       unsigned int len)
 {
     struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 
     u64_stats_update_begin(&tstats->syncp);
     u64_stats_add(&tstats->tx_bytes, len);
     u64_stats_add(&tstats->tx_packets, packets);
     u64_stats_update_end(&tstats->syncp);
 }
 
 static inline void dev_lstats_add(struct net_device *dev, unsigned int len)
 {
     struct pcpu_lstats *lstats = this_cpu_ptr(dev->lstats);
 
     u64_stats_update_begin(&lstats->syncp);
     u64_stats_add(&lstats->bytes, len);
     u64_stats_inc(&lstats->packets);
     u64_stats_update_end(&lstats->syncp);
 }
 
 #define __netdev_alloc_pcpu_stats(type, gfp)                \
 ({                                  \
     typeof(type) __percpu *pcpu_stats = alloc_percpu_gfp(type, gfp);\
     if (pcpu_stats) {                       \
         int __cpu;                      \
         for_each_possible_cpu(__cpu) {              \
             typeof(type) *stat;             \
             stat = per_cpu_ptr(pcpu_stats, __cpu);      \
             u64_stats_init(&stat->syncp);           \
         }                           \
     }                               \
     pcpu_stats;                         \
 })
 
 #define netdev_alloc_pcpu_stats(type)                   \
     __netdev_alloc_pcpu_stats(type, GFP_KERNEL)
 
 #define devm_netdev_alloc_pcpu_stats(dev, type)             \
 ({                                  \
     typeof(type) __percpu *pcpu_stats = devm_alloc_percpu(dev, type);\
     if (pcpu_stats) {                       \
         int __cpu;                      \
         for_each_possible_cpu(__cpu) {              \
             typeof(type) *stat;             \
             stat = per_cpu_ptr(pcpu_stats, __cpu);      \
             u64_stats_init(&stat->syncp);           \
         }                           \
     }                               \
     pcpu_stats;                         \
 })
 
 enum netdev_lag_tx_type {
     NETDEV_LAG_TX_TYPE_UNKNOWN,
     NETDEV_LAG_TX_TYPE_RANDOM,
     NETDEV_LAG_TX_TYPE_BROADCAST,
     NETDEV_LAG_TX_TYPE_ROUNDROBIN,
     NETDEV_LAG_TX_TYPE_ACTIVEBACKUP,
     NETDEV_LAG_TX_TYPE_HASH,
 };
 
 enum netdev_lag_hash {
     NETDEV_LAG_HASH_NONE,
     NETDEV_LAG_HASH_L2,
     NETDEV_LAG_HASH_L34,
     NETDEV_LAG_HASH_L23,
     NETDEV_LAG_HASH_E23,
     NETDEV_LAG_HASH_E34,
     NETDEV_LAG_HASH_VLAN_SRCMAC,
     NETDEV_LAG_HASH_UNKNOWN,
 };
 
 struct netdev_lag_upper_info {
     enum netdev_lag_tx_type tx_type;
     enum netdev_lag_hash hash_type;
 };
 
 struct netdev_lag_lower_state_info {
     u8 link_up : 1,
        tx_enabled : 1;
 };
 
 #include <linux/notifier.h>
 
 /* netdevice notifier chain. Please remember to update netdev_cmd_to_name()
  * and the rtnetlink notification exclusion list in rtnetlink_event() when
  * adding new types.
  */
 enum netdev_cmd {
     NETDEV_UP   = 1,    /* For now you can't veto a device up/down */
     NETDEV_DOWN,
     NETDEV_REBOOT,      /* Tell a protocol stack a network interface
                    detected a hardware crash and restarted
                    - we can use this eg to kick tcp sessions
                    once done */
     NETDEV_CHANGE,      /* Notify device state change */
     NETDEV_REGISTER,
     NETDEV_UNREGISTER,
     NETDEV_CHANGEMTU,   /* notify after mtu change happened */
     NETDEV_CHANGEADDR,  /* notify after the address change */
     NETDEV_PRE_CHANGEADDR,  /* notify before the address change */
     NETDEV_GOING_DOWN,
     NETDEV_CHANGENAME,
     NETDEV_FEAT_CHANGE,
     NETDEV_BONDING_FAILOVER,
     NETDEV_PRE_UP,
     NETDEV_PRE_TYPE_CHANGE,
     NETDEV_POST_TYPE_CHANGE,
     NETDEV_POST_INIT,
     NETDEV_RELEASE,
     NETDEV_NOTIFY_PEERS,
     NETDEV_JOIN,
     NETDEV_CHANGEUPPER,
     NETDEV_RESEND_IGMP,
     NETDEV_PRECHANGEMTU,    /* notify before mtu change happened */
     NETDEV_CHANGEINFODATA,
     NETDEV_BONDING_INFO,
     NETDEV_PRECHANGEUPPER,
     NETDEV_CHANGELOWERSTATE,
     NETDEV_UDP_TUNNEL_PUSH_INFO,
     NETDEV_UDP_TUNNEL_DROP_INFO,
     NETDEV_CHANGE_TX_QUEUE_LEN,
     NETDEV_CVLAN_FILTER_PUSH_INFO,
     NETDEV_CVLAN_FILTER_DROP_INFO,
     NETDEV_SVLAN_FILTER_PUSH_INFO,
     NETDEV_SVLAN_FILTER_DROP_INFO,
     NETDEV_OFFLOAD_XSTATS_ENABLE,
     NETDEV_OFFLOAD_XSTATS_DISABLE,
     NETDEV_OFFLOAD_XSTATS_REPORT_USED,
     NETDEV_OFFLOAD_XSTATS_REPORT_DELTA,
 };
 const char *netdev_cmd_to_name(enum netdev_cmd cmd);
 
 int register_netdevice_notifier(struct notifier_block *nb);
 int unregister_netdevice_notifier(struct notifier_block *nb);
 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb);
 int unregister_netdevice_notifier_net(struct net *net,
                       struct notifier_block *nb);
 int register_netdevice_notifier_dev_net(struct net_device *dev,
                     struct notifier_block *nb,
                     struct netdev_net_notifier *nn);
 int unregister_netdevice_notifier_dev_net(struct net_device *dev,
                       struct notifier_block *nb,
                       struct netdev_net_notifier *nn);
 
 struct netdev_notifier_info {
     struct net_device   *dev;
     struct netlink_ext_ack  *extack;
 };
 
 struct netdev_notifier_info_ext {
     struct netdev_notifier_info info; /* must be first */
     union {
         u32 mtu;
     } ext;
 };
 
 struct netdev_notifier_change_info {
     struct netdev_notifier_info info; /* must be first */
     unsigned int flags_changed;
 };
 
 struct netdev_notifier_changeupper_info {
     struct netdev_notifier_info info; /* must be first */
     struct net_device *upper_dev; /* new upper dev */
     bool master; /* is upper dev master */
     bool linking; /* is the notification for link or unlink */
     void *upper_info; /* upper dev info */
 };
 
 struct netdev_notifier_changelowerstate_info {
     struct netdev_notifier_info info; /* must be first */
     void *lower_state_info; /* is lower dev state */
 };
 
 struct netdev_notifier_pre_changeaddr_info {
     struct netdev_notifier_info info; /* must be first */
     const unsigned char *dev_addr;
 };
 
 enum netdev_offload_xstats_type {
     NETDEV_OFFLOAD_XSTATS_TYPE_L3 = 1,
 };
 
 struct netdev_notifier_offload_xstats_info {
     struct netdev_notifier_info info; /* must be first */
     enum netdev_offload_xstats_type type;
 
     union {
         /* NETDEV_OFFLOAD_XSTATS_REPORT_DELTA */
         struct netdev_notifier_offload_xstats_rd *report_delta;
         /* NETDEV_OFFLOAD_XSTATS_REPORT_USED */
         struct netdev_notifier_offload_xstats_ru *report_used;
     };
 };
 
 int netdev_offload_xstats_enable(struct net_device *dev,
                  enum netdev_offload_xstats_type type,
                  struct netlink_ext_ack *extack);
 int netdev_offload_xstats_disable(struct net_device *dev,
                   enum netdev_offload_xstats_type type);
 bool netdev_offload_xstats_enabled(const struct net_device *dev,
                    enum netdev_offload_xstats_type type);
 int netdev_offload_xstats_get(struct net_device *dev,
                   enum netdev_offload_xstats_type type,
                   struct rtnl_hw_stats64 *stats, bool *used,
                   struct netlink_ext_ack *extack);
 void
 netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *rd,
                    const struct rtnl_hw_stats64 *stats);
 void
 netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *ru);
 void netdev_offload_xstats_push_delta(struct net_device *dev,
                       enum netdev_offload_xstats_type type,
                       const struct rtnl_hw_stats64 *stats);
 
 static inline void netdev_notifier_info_init(struct netdev_notifier_info *info,
                          struct net_device *dev)
 {
     info->dev = dev;
     info->extack = NULL;
 }
 
 static inline struct net_device *
 netdev_notifier_info_to_dev(const struct netdev_notifier_info *info)
 {
     return info->dev;
 }
 
 static inline struct netlink_ext_ack *
 netdev_notifier_info_to_extack(const struct netdev_notifier_info *info)
 {
     return info->extack;
 }
 
 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_reverse(net, d)        \
         list_for_each_entry_continue_reverse(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);
 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);
 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);
 
 int dev_get_iflink(const struct net_device *dev);
 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb);
 int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
               struct net_device_path_stack *stack);
 struct net_device *__dev_get_by_flags(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);
 bool netdev_name_in_use(struct net *net, const char *name);
 int dev_alloc_name(struct net_device *dev, const char *name);
 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack);
 void dev_close(struct net_device *dev);
 void dev_close_many(struct list_head *head, bool unlink);
 void dev_disable_lro(struct net_device *dev);
 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *newskb);
 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
              struct net_device *sb_dev);
 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
                struct net_device *sb_dev);
 
 int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev);
 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id);
 
 static inline int dev_queue_xmit(struct sk_buff *skb)
 {
     return __dev_queue_xmit(skb, NULL);
 }
 
 static inline int dev_queue_xmit_accel(struct sk_buff *skb,
                        struct net_device *sb_dev)
 {
     return __dev_queue_xmit(skb, sb_dev);
 }
 
 static inline int dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
 {
     int ret;
 
     ret = __dev_direct_xmit(skb, queue_id);
     if (!dev_xmit_complete(ret))
         kfree_skb(skb);
     return ret;
 }
 
 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);
 int init_dummy_netdev(struct net_device *dev);
 
 struct net_device *netdev_get_xmit_slave(struct net_device *dev,
                      struct sk_buff *skb,
                      bool all_slaves);
 struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,
                         struct sock *sk);
 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);
 struct net_device *dev_get_by_napi_id(unsigned int napi_id);
 int dev_restart(struct net_device *dev);
 
 
 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 __be16 dev_parse_header_protocol(const struct sk_buff *skb)
 {
     const struct net_device *dev = skb->dev;
 
     if (!dev->header_ops || !dev->header_ops->parse_protocol)
         return 0;
     return dev->header_ops->parse_protocol(skb);
 }
 
 /* ll_header must have at least hard_header_len allocated */
 static inline bool dev_validate_header(const struct net_device *dev,
                        char *ll_header, int len)
 {
     if (likely(len >= dev->hard_header_len))
         return true;
     if (len < dev->min_header_len)
         return false;
 
     if (capable(CAP_SYS_RAWIO)) {
         memset(ll_header + len, 0, dev->hard_header_len - len);
         return true;
     }
 
     if (dev->header_ops && dev->header_ops->validate)
         return dev->header_ops->validate(ll_header, len);
 
     return false;
 }
 
 static inline bool dev_has_header(const struct net_device *dev)
 {
     return dev->header_ops && dev->header_ops->create;
 }
 
 /*
  * Incoming packets are placed on per-CPU queues
  */
 struct softnet_data {
     struct list_head    poll_list;
     struct sk_buff_head process_queue;
 
     /* stats */
     unsigned int        processed;
     unsigned int        time_squeeze;
     unsigned int        received_rps;
 #ifdef CONFIG_RPS
     struct softnet_data *rps_ipi_list;
 #endif
 #ifdef CONFIG_NET_FLOW_LIMIT
     struct sd_flow_limit __rcu *flow_limit;
 #endif
     struct Qdisc        *output_queue;
     struct Qdisc        **output_queue_tailp;
     struct sk_buff      *completion_queue;
 #ifdef CONFIG_XFRM_OFFLOAD
     struct sk_buff_head xfrm_backlog;
 #endif
     /* written and read only by owning cpu: */
     struct {
         u16 recursion;
         u8  more;
 #ifdef CONFIG_NET_EGRESS
         u8  skip_txqueue;
 #endif
     } xmit;
 #ifdef CONFIG_RPS
     /* input_queue_head should be written by cpu owning this struct,
      * and only read by other cpus. Worth using a cache line.
      */
     unsigned int        input_queue_head ____cacheline_aligned_in_smp;
 
     /* Elements below can be accessed between CPUs for RPS/RFS */
     call_single_data_t  csd ____cacheline_aligned_in_smp;
     struct softnet_data *rps_ipi_next;
     unsigned int        cpu;
     unsigned int        input_queue_tail;
 #endif
     unsigned int        dropped;
     struct sk_buff_head input_pkt_queue;
     struct napi_struct  backlog;
 
     /* Another possibly contended cache line */
     spinlock_t      defer_lock ____cacheline_aligned_in_smp;
     int         defer_count;
     int         defer_ipi_scheduled;
     struct sk_buff      *defer_list;
     call_single_data_t  defer_csd;
 };
 
 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);
 
 static inline int dev_recursion_level(void)
 {
     return this_cpu_read(softnet_data.xmit.recursion);
 }
 
 #define XMIT_RECURSION_LIMIT    8
 static inline bool dev_xmit_recursion(void)
 {
     return unlikely(__this_cpu_read(softnet_data.xmit.recursion) >
             XMIT_RECURSION_LIMIT);
 }
 
 static inline void dev_xmit_recursion_inc(void)
 {
     __this_cpu_inc(softnet_data.xmit.recursion);
 }
 
 static inline void dev_xmit_recursion_dec(void)
 {
     __this_cpu_dec(softnet_data.xmit.recursion);
 }
 
 void __netif_schedule(struct Qdisc *q);
 void netif_schedule_queue(struct netdev_queue *txq);
 
 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 __always_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);
     }
 }
 
 void netif_tx_wake_queue(struct netdev_queue *dev_queue);
 
 /**
  *  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 __always_inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
 {
     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));
 }
 
 void netif_tx_stop_all_queues(struct net_device *dev);
 
 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;
 }
 
 /**
  *  netdev_queue_set_dql_min_limit - set dql minimum limit
  *  @dev_queue: pointer to transmit queue
  *  @min_limit: dql minimum limit
  *
  * Forces xmit_more() to return true until the minimum threshold
  * defined by @min_limit is reached (or until the tx queue is
  * empty). Warning: to be use with care, misuse will impact the
  * latency.
  */
 static inline void netdev_queue_set_dql_min_limit(struct netdev_queue *dev_queue,
                           unsigned int min_limit)
 {
 #ifdef CONFIG_BQL
     dev_queue->dql.min_limit = min_limit;
 #endif
 }
 
 /**
  *  netdev_txq_bql_enqueue_prefetchw - prefetch bql data for write
  *  @dev_queue: pointer to transmit queue
  *
  * BQL enabled drivers might use this helper in their ndo_start_xmit(),
  * to give appropriate hint to the CPU.
  */
 static inline void netdev_txq_bql_enqueue_prefetchw(struct netdev_queue *dev_queue)
 {
 #ifdef CONFIG_BQL
     prefetchw(&dev_queue->dql.num_queued);
 #endif
 }
 
 /**
  *  netdev_txq_bql_complete_prefetchw - prefetch bql data for write
  *  @dev_queue: pointer to transmit queue
  *
  * BQL enabled drivers might use this helper in their TX completion path,
  * to give appropriate hint to the CPU.
  */
 static inline void netdev_txq_bql_complete_prefetchw(struct netdev_queue *dev_queue)
 {
 #ifdef CONFIG_BQL
     prefetchw(&dev_queue->dql.limit);
 #endif
 }
 
 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
 }
 
 /* Variant of netdev_tx_sent_queue() for drivers that are aware
  * that they should not test BQL status themselves.
  * We do want to change __QUEUE_STATE_STACK_XOFF only for the last
  * skb of a batch.
  * Returns true if the doorbell must be used to kick the NIC.
  */
 static inline bool __netdev_tx_sent_queue(struct netdev_queue *dev_queue,
                       unsigned int bytes,
                       bool xmit_more)
 {
     if (xmit_more) {
 #ifdef CONFIG_BQL
         dql_queued(&dev_queue->dql, bytes);
 #endif
         return netif_tx_queue_stopped(dev_queue);
     }
     netdev_tx_sent_queue(dev_queue, bytes);
     return true;
 }
 
 /**
  *  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 bool __netdev_sent_queue(struct net_device *dev,
                        unsigned int bytes,
                        bool xmit_more)
 {
     return __netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes,
                       xmit_more);
 }
 
 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 (unlikely(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);
 }
 
 /**
  *  netif_subqueue_stopped - test status of subqueue
  *  @dev: network device
  *  @skb: sub queue buffer pointer
  *
  * Check individual transmit queue of a device with multiple transmit queues.
  */
 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);
 
     netif_tx_wake_queue(txq);
 }
 
 #ifdef CONFIG_XPS
 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
             u16 index);
 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
               u16 index, enum xps_map_type type);
 
 /**
  *  netif_attr_test_mask - Test a CPU or Rx queue set in a mask
  *  @j: CPU/Rx queue index
  *  @mask: bitmask of all cpus/rx queues
  *  @nr_bits: number of bits in the bitmask
  *
  * Test if a CPU or Rx queue index is set in a mask of all CPU/Rx queues.
  */
 static inline bool netif_attr_test_mask(unsigned long j,
                     const unsigned long *mask,
                     unsigned int nr_bits)
 {
     cpu_max_bits_warn(j, nr_bits);
     return test_bit(j, mask);
 }
 
 /**
  *  netif_attr_test_online - Test for online CPU/Rx queue
  *  @j: CPU/Rx queue index
  *  @online_mask: bitmask for CPUs/Rx queues that are online
  *  @nr_bits: number of bits in the bitmask
  *
  * Returns true if a CPU/Rx queue is online.
  */
 static inline bool netif_attr_test_online(unsigned long j,
                       const unsigned long *online_mask,
                       unsigned int nr_bits)
 {
     cpu_max_bits_warn(j, nr_bits);
 
     if (online_mask)
         return test_bit(j, online_mask);
 
     return (j < nr_bits);
 }
 
 /**
  *  netif_attrmask_next - get the next CPU/Rx queue in a cpu/Rx queues mask
  *  @n: CPU/Rx queue index
  *  @srcp: the cpumask/Rx queue mask pointer
  *  @nr_bits: number of bits in the bitmask
  *
  * Returns >= nr_bits if no further CPUs/Rx queues set.
  */
 static inline unsigned int netif_attrmask_next(int n, const unsigned long *srcp,
                            unsigned int nr_bits)
 {
     /* -1 is a legal arg here. */
     if (n != -1)
         cpu_max_bits_warn(n, nr_bits);
 
     if (srcp)
         return find_next_bit(srcp, nr_bits, n + 1);
 
     return n + 1;
 }
 
 /**
  *  netif_attrmask_next_and - get the next CPU/Rx queue in \*src1p & \*src2p
  *  @n: CPU/Rx queue index
  *  @src1p: the first CPUs/Rx queues mask pointer
  *  @src2p: the second CPUs/Rx queues mask pointer
  *  @nr_bits: number of bits in the bitmask
  *
  * Returns >= nr_bits if no further CPUs/Rx queues set in both.
  */
 static inline int netif_attrmask_next_and(int n, const unsigned long *src1p,
                       const unsigned long *src2p,
                       unsigned int nr_bits)
 {
     /* -1 is a legal arg here. */
     if (n != -1)
         cpu_max_bits_warn(n, nr_bits);
 
     if (src1p && src2p)
         return find_next_and_bit(src1p, src2p, nr_bits, n + 1);
     else if (src1p)
         return find_next_bit(src1p, nr_bits, n + 1);
     else if (src2p)
         return find_next_bit(src2p, nr_bits, n + 1);
 
     return n + 1;
 }
 #else
 static inline int netif_set_xps_queue(struct net_device *dev,
                       const struct cpumask *mask,
                       u16 index)
 {
     return 0;
 }
 
 static inline int __netif_set_xps_queue(struct net_device *dev,
                     const unsigned long *mask,
                     u16 index, enum xps_map_type type)
 {
     return 0;
 }
 #endif
 
 /**
  *  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 rxqs)
 {
     dev->real_num_rx_queues = rxqs;
     return 0;
 }
 #endif
 int netif_set_real_num_queues(struct net_device *dev,
                   unsigned int txq, unsigned int rxq);
 
 static inline struct netdev_rx_queue *
 __netif_get_rx_queue(struct net_device *dev, unsigned int rxq)
 {
     return dev->_rx + rxq;
 }
 
 #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
 
 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_hardirq() || 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);
 }
 
 u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp,
                  struct bpf_prog *xdp_prog);
 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog);
 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb);
 int netif_rx(struct sk_buff *skb);
 int __netif_rx(struct sk_buff *skb);
 
 int netif_receive_skb(struct sk_buff *skb);
 int netif_receive_skb_core(struct sk_buff *skb);
 void netif_receive_skb_list_internal(struct list_head *head);
 void netif_receive_skb_list(struct list_head *head);
 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;
 }
 
 bool netdev_is_rx_handler_busy(struct net_device *dev);
 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);
 static inline bool is_socket_ioctl_cmd(unsigned int cmd)
 {
     return _IOC_TYPE(cmd) == SOCK_IOC_TYPE;
 }
 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg);
 int put_user_ifreq(struct ifreq *ifr, void __user *arg);
 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr,
         void __user *data, bool *need_copyout);
 int dev_ifconf(struct net *net, struct ifconf __user *ifc);
 int dev_ethtool(struct net *net, struct ifreq *ifr, void __user *userdata);
 unsigned int dev_get_flags(const struct net_device *);
 int __dev_change_flags(struct net_device *dev, unsigned int flags,
                struct netlink_ext_ack *extack);
 int dev_change_flags(struct net_device *dev, unsigned int flags,
              struct netlink_ext_ack *extack);
 void __dev_notify_flags(struct net_device *, unsigned int old_flags,
             unsigned int gchanges);
 int dev_set_alias(struct net_device *, const char *, size_t);
 int dev_get_alias(const struct net_device *, char *, size_t);
 int __dev_change_net_namespace(struct net_device *dev, struct net *net,
                    const char *pat, int new_ifindex);
 static inline
 int dev_change_net_namespace(struct net_device *dev, struct net *net,
                  const char *pat)
 {
     return __dev_change_net_namespace(dev, net, pat, 0);
 }
 int __dev_set_mtu(struct net_device *, int);
 int dev_set_mtu(struct net_device *, int);
 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
                   struct netlink_ext_ack *extack);
 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
             struct netlink_ext_ack *extack);
 int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
                  struct netlink_ext_ack *extack);
 int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name);
 int dev_get_port_parent_id(struct net_device *dev,
                struct netdev_phys_item_id *ppid, bool recurse);
 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b);
 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again);
 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
                     struct netdev_queue *txq, int *ret);
 
 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
 u8 dev_xdp_prog_count(struct net_device *dev);
 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode);
 
 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
 int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb);
 bool is_skb_forwardable(const struct net_device *dev,
             const struct sk_buff *skb);
 
 static __always_inline bool __is_skb_forwardable(const struct net_device *dev,
                          const struct sk_buff *skb,
                          const bool check_mtu)
 {
     const u32 vlan_hdr_len = 4; /* VLAN_HLEN */
     unsigned int len;
 
     if (!(dev->flags & IFF_UP))
         return false;
 
     if (!check_mtu)
         return true;
 
     len = dev->mtu + dev->hard_header_len + vlan_hdr_len;
     if (skb->len <= len)
         return true;
 
     /* if TSO is enabled, we don't care about the length as the packet
      * could be forwarded without being segmented before
      */
     if (skb_is_gso(skb))
         return true;
 
     return false;
 }
 
 struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev);
 
 static inline struct net_device_core_stats __percpu *dev_core_stats(struct net_device *dev)
 {
     /* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */
     struct net_device_core_stats __percpu *p = READ_ONCE(dev->core_stats);
 
     if (likely(p))
         return p;
 
     return netdev_core_stats_alloc(dev);
 }
 
 #define DEV_CORE_STATS_INC(FIELD)                       \
 static inline void dev_core_stats_##FIELD##_inc(struct net_device *dev)     \
 {                                       \
     struct net_device_core_stats __percpu *p;               \
                                         \
     p = dev_core_stats(dev);                        \
     if (p)                                  \
         this_cpu_inc(p->FIELD);                     \
 }
 DEV_CORE_STATS_INC(rx_dropped)
 DEV_CORE_STATS_INC(tx_dropped)
 DEV_CORE_STATS_INC(rx_nohandler)
 DEV_CORE_STATS_INC(rx_otherhost_dropped)
 
 static __always_inline int ____dev_forward_skb(struct net_device *dev,
                            struct sk_buff *skb,
                            const bool check_mtu)
 {
     if (skb_orphan_frags(skb, GFP_ATOMIC) ||
         unlikely(!__is_skb_forwardable(dev, skb, check_mtu))) {
         dev_core_stats_rx_dropped_inc(dev);
         kfree_skb(skb);
         return NET_RX_DROP;
     }
 
     skb_scrub_packet(skb, !net_eq(dev_net(dev), dev_net(skb->dev)));
     skb->priority = 0;
     return 0;
 }
 
 bool dev_nit_active(struct net_device *dev);
 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev);
 
 static inline void __dev_put(struct net_device *dev)
 {
     if (dev) {
 #ifdef CONFIG_PCPU_DEV_REFCNT
         this_cpu_dec(*dev->pcpu_refcnt);
 #else
         refcount_dec(&dev->dev_refcnt);
 #endif
     }
 }
 
 static inline void __dev_hold(struct net_device *dev)
 {
     if (dev) {
 #ifdef CONFIG_PCPU_DEV_REFCNT
         this_cpu_inc(*dev->pcpu_refcnt);
 #else
         refcount_inc(&dev->dev_refcnt);
 #endif
     }
 }
 
 static inline void __netdev_tracker_alloc(struct net_device *dev,
                       netdevice_tracker *tracker,
                       gfp_t gfp)
 {
 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
     ref_tracker_alloc(&dev->refcnt_tracker, tracker, gfp);
 #endif
 }
 
 /* netdev_tracker_alloc() can upgrade a prior untracked reference
  * taken by dev_get_by_name()/dev_get_by_index() to a tracked one.
  */
 static inline void netdev_tracker_alloc(struct net_device *dev,
                     netdevice_tracker *tracker, gfp_t gfp)
 {
 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
     refcount_dec(&dev->refcnt_tracker.no_tracker);
     __netdev_tracker_alloc(dev, tracker, gfp);
 #endif
 }
 
 static inline void netdev_tracker_free(struct net_device *dev,
                        netdevice_tracker *tracker)
 {
 #ifdef CONFIG_NET_DEV_REFCNT_TRACKER
     ref_tracker_free(&dev->refcnt_tracker, tracker);
 #endif
 }
 
 static inline void netdev_hold(struct net_device *dev,
                    netdevice_tracker *tracker, gfp_t gfp)
 {
     if (dev) {
         __dev_hold(dev);
         __netdev_tracker_alloc(dev, tracker, gfp);
     }
 }
 
 static inline void netdev_put(struct net_device *dev,
                   netdevice_tracker *tracker)
 {
     if (dev) {
         netdev_tracker_free(dev, tracker);
         __dev_put(dev);
     }
 }
 
 /**
  *  dev_hold - get reference to device
  *  @dev: network device
  *
  * Hold reference to device to keep it from being freed.
  * Try using netdev_hold() instead.
  */
 static inline void dev_hold(struct net_device *dev)
 {
     netdev_hold(dev, NULL, GFP_ATOMIC);
 }
 
 /**
  *  dev_put - release reference to device
  *  @dev: network device
  *
  * Release reference to device to allow it to be freed.
  * Try using netdev_put() instead.
  */
 static inline void dev_put(struct net_device *dev)
 {
     netdev_put(dev, NULL);
 }
 
 static inline void netdev_ref_replace(struct net_device *odev,
                       struct net_device *ndev,
                       netdevice_tracker *tracker,
                       gfp_t gfp)
 {
     if (odev)
         netdev_tracker_free(odev, tracker);
 
     __dev_hold(ndev);
     __dev_put(odev);
 
     if (ndev)
         __netdev_tracker_alloc(ndev, tracker, gfp);
 }
 
 /* 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_fire_event(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);
 void netif_carrier_event(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 device is dormant
  *  @dev: network device
  *
  * Check if device is dormant.
  */
 static inline bool netif_dormant(const struct net_device *dev)
 {
     return test_bit(__LINK_STATE_DORMANT, &dev->state);
 }
 
 
 /**
  *  netif_testing_on - mark device as under test.
  *  @dev: network device
  *
  * Mark device as under test (as per RFC2863).
  *
  * The testing state indicates that some test(s) must be performed on
  * the interface. After completion, of the test, the interface state
  * will change to up, dormant, or down, as appropriate.
  */
 static inline void netif_testing_on(struct net_device *dev)
 {
     if (!test_and_set_bit(__LINK_STATE_TESTING, &dev->state))
         linkwatch_fire_event(dev);
 }
 
 /**
  *  netif_testing_off - set device as not under test.
  *  @dev: network device
  *
  * Device is not in testing state.
  */
 static inline void netif_testing_off(struct net_device *dev)
 {
     if (test_and_clear_bit(__LINK_STATE_TESTING, &dev->state))
         linkwatch_fire_event(dev);
 }
 
 /**
  *  netif_testing - test if device is under test
  *  @dev: network device
  *
  * Check if device is under test
  */
 static inline bool netif_testing(const struct net_device *dev)
 {
     return test_bit(__LINK_STATE_TESTING, &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(const 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_BIT,
     NETIF_MSG_PROBE_BIT,
     NETIF_MSG_LINK_BIT,
     NETIF_MSG_TIMER_BIT,
     NETIF_MSG_IFDOWN_BIT,
     NETIF_MSG_IFUP_BIT,
     NETIF_MSG_RX_ERR_BIT,
     NETIF_MSG_TX_ERR_BIT,
     NETIF_MSG_TX_QUEUED_BIT,
     NETIF_MSG_INTR_BIT,
     NETIF_MSG_TX_DONE_BIT,
     NETIF_MSG_RX_STATUS_BIT,
     NETIF_MSG_PKTDATA_BIT,
     NETIF_MSG_HW_BIT,
     NETIF_MSG_WOL_BIT,
 
     /* When you add a new bit above, update netif_msg_class_names array
      * in net/ethtool/common.c
      */
     NETIF_MSG_CLASS_COUNT,
 };
 /* Both ethtool_ops interface and internal driver implementation use u32 */
 static_assert(NETIF_MSG_CLASS_COUNT <= 32);
 
 #define __NETIF_MSG_BIT(bit)    ((u32)1 << (bit))
 #define __NETIF_MSG(name)   __NETIF_MSG_BIT(NETIF_MSG_ ## name ## _BIT)
 
 #define NETIF_MSG_DRV       __NETIF_MSG(DRV)
 #define NETIF_MSG_PROBE     __NETIF_MSG(PROBE)
 #define NETIF_MSG_LINK      __NETIF_MSG(LINK)
 #define NETIF_MSG_TIMER     __NETIF_MSG(TIMER)
 #define NETIF_MSG_IFDOWN    __NETIF_MSG(IFDOWN)
 #define NETIF_MSG_IFUP      __NETIF_MSG(IFUP)
 #define NETIF_MSG_RX_ERR    __NETIF_MSG(RX_ERR)
 #define NETIF_MSG_TX_ERR    __NETIF_MSG(TX_ERR)
 #define NETIF_MSG_TX_QUEUED __NETIF_MSG(TX_QUEUED)
 #define NETIF_MSG_INTR      __NETIF_MSG(INTR)
 #define NETIF_MSG_TX_DONE   __NETIF_MSG(TX_DONE)
 #define NETIF_MSG_RX_STATUS __NETIF_MSG(RX_STATUS)
 #define NETIF_MSG_PKTDATA   __NETIF_MSG(PKTDATA)
 #define NETIF_MSG_HW        __NETIF_MSG(HW)
 #define NETIF_MSG_WOL       __NETIF_MSG(WOL)
 
 #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 (1U << debug_value) - 1;
 }
 
 static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
 {
     spin_lock(&txq->_xmit_lock);
     /* Pairs with READ_ONCE() in __dev_queue_xmit() */
     WRITE_ONCE(txq->xmit_lock_owner, cpu);
 }
 
 static inline bool __netif_tx_acquire(struct netdev_queue *txq)
 {
     __acquire(&txq->_xmit_lock);
     return true;
 }
 
 static inline void __netif_tx_release(struct netdev_queue *txq)
 {
     __release(&txq->_xmit_lock);
 }
 
 static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
 {
     spin_lock_bh(&txq->_xmit_lock);
     /* Pairs with READ_ONCE() in __dev_queue_xmit() */
     WRITE_ONCE(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)) {
         /* Pairs with READ_ONCE() in __dev_queue_xmit() */
         WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id());
     }
     return ok;
 }
 
 static inline void __netif_tx_unlock(struct netdev_queue *txq)
 {
     /* Pairs with READ_ONCE() in __dev_queue_xmit() */
     WRITE_ONCE(txq->xmit_lock_owner, -1);
     spin_unlock(&txq->_xmit_lock);
 }
 
 static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
 {
     /* Pairs with READ_ONCE() in __dev_queue_xmit() */
     WRITE_ONCE(txq->xmit_lock_owner, -1);
     spin_unlock_bh(&txq->_xmit_lock);
 }
 
 /*
  * txq->trans_start can be read locklessly from dev_watchdog()
  */
 static inline void txq_trans_update(struct netdev_queue *txq)
 {
     if (txq->xmit_lock_owner != -1)
         WRITE_ONCE(txq->trans_start, jiffies);
 }
 
 static inline void txq_trans_cond_update(struct netdev_queue *txq)
 {
     unsigned long now = jiffies;
 
     if (READ_ONCE(txq->trans_start) != now)
         WRITE_ONCE(txq->trans_start, now);
 }
 
 /* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
 static inline void netif_trans_update(struct net_device *dev)
 {
     struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
 
     txq_trans_cond_update(txq);
 }
 
 /**
  *  netif_tx_lock - grab network device transmit lock
  *  @dev: network device
  *
  * Get network device transmit lock
  */
 void netif_tx_lock(struct net_device *dev);
 
 static inline void netif_tx_lock_bh(struct net_device *dev)
 {
     local_bh_disable();
     netif_tx_lock(dev);
 }
 
 void netif_tx_unlock(struct net_device *dev);
 
 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);      \
     } else {                    \
         __netif_tx_acquire(txq);        \
     }                       \
 }
 
 #define HARD_TX_TRYLOCK(dev, txq)           \
     (((dev->features & NETIF_F_LLTX) == 0) ?    \
         __netif_tx_trylock(txq) :       \
         __netif_tx_acquire(txq))
 
 #define HARD_TX_UNLOCK(dev, txq) {          \
     if ((dev->features & NETIF_F_LLTX) == 0) {  \
         __netif_tx_unlock(txq);         \
     } else {                    \
         __netif_tx_release(txq);        \
     }                       \
 }
 
 static inline void netif_tx_disable(struct net_device *dev)
 {
     unsigned int i;
     int cpu;
 
     local_bh_disable();
     cpu = smp_processor_id();
     spin_lock(&dev->tx_global_lock);
     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);
     }
     spin_unlock(&dev->tx_global_lock);
     local_bh_enable();
 }
 
 static inline void netif_addr_lock(struct net_device *dev)
 {
     unsigned char nest_level = 0;
 
 #ifdef CONFIG_LOCKDEP
     nest_level = dev->nested_level;
 #endif
     spin_lock_nested(&dev->addr_list_lock, nest_level);
 }
 
 static inline void netif_addr_lock_bh(struct net_device *dev)
 {
     unsigned char nest_level = 0;
 
 #ifdef CONFIG_LOCKDEP
     nest_level = dev->nested_level;
 #endif
     local_bh_disable();
     spin_lock_nested(&dev->addr_list_lock, nest_level);
 }
 
 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,
                     unsigned char name_assign_type,
                     void (*setup)(struct net_device *),
                     unsigned int txqs, unsigned int rxqs);
 #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \
     alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1)
 
 #define alloc_netdev_mq(sizeof_priv, name, name_assign_type, setup, count) \
     alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, count, \
              count)
 
 int register_netdev(struct net_device *dev);
 void unregister_netdev(struct net_device *dev);
 
 int devm_register_netdev(struct device *dev, struct net_device *ndev);
 
 /* 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 *));
 int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list,
                struct net_device *dev,
                int (*sync)(struct net_device *,
                        const unsigned char *, int),
                int (*unsync)(struct net_device *,
                      const unsigned char *, int));
 void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list,
                   struct net_device *dev,
                   int (*unsync)(struct net_device *,
                         const unsigned char *, int));
 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 */
 void dev_addr_mod(struct net_device *dev, unsigned int offset,
           const void *addr, size_t len);
 
 static inline void
 __dev_addr_set(struct net_device *dev, const void *addr, size_t len)
 {
     dev_addr_mod(dev, 0, addr, len);
 }
 
 static inline void dev_addr_set(struct net_device *dev, const u8 *addr)
 {
     __dev_addr_set(dev, addr, dev->addr_len);
 }
 
 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);
 
 /* 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 synchronized 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 synchronized 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);
 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_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);
 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
                const struct pcpu_sw_netstats __percpu *netstats);
 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s);
 
 extern int      netdev_max_backlog;
 extern int      dev_rx_weight;
 extern int      dev_tx_weight;
 extern int      gro_normal_batch;
 
 enum {
     NESTED_SYNC_IMM_BIT,
     NESTED_SYNC_TODO_BIT,
 };
 
 #define __NESTED_SYNC_BIT(bit)  ((u32)1 << (bit))
 #define __NESTED_SYNC(name) __NESTED_SYNC_BIT(NESTED_SYNC_ ## name ## _BIT)
 
 #define NESTED_SYNC_IMM     __NESTED_SYNC(IMM)
 #define NESTED_SYNC_TODO    __NESTED_SYNC(TODO)
 
 struct netdev_nested_priv {
     unsigned char flags;
     void *data;
 };
 
 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);
 
 /* 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)))
 
 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
                   int (*fn)(struct net_device *upper_dev,
                         struct netdev_nested_priv *priv),
                   struct netdev_nested_priv *priv);
 
 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
                   struct net_device *upper_dev);
 
 bool netdev_has_any_upper_dev(struct net_device *dev);
 
 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.next, \
          ldev = netdev_lower_get_next(dev, &(iter)); \
          ldev; \
          ldev = netdev_lower_get_next(dev, &(iter)))
 
 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
                          struct list_head **iter);
 int netdev_walk_all_lower_dev(struct net_device *dev,
                   int (*fn)(struct net_device *lower_dev,
                     struct netdev_nested_priv *priv),
                   struct netdev_nested_priv *priv);
 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
                   int (*fn)(struct net_device *lower_dev,
                         struct netdev_nested_priv *priv),
                   struct netdev_nested_priv *priv);
 
 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,
               struct netlink_ext_ack *extack);
 int netdev_master_upper_dev_link(struct net_device *dev,
                  struct net_device *upper_dev,
                  void *upper_priv, void *upper_info,
                  struct netlink_ext_ack *extack);
 void netdev_upper_dev_unlink(struct net_device *dev,
                  struct net_device *upper_dev);
 int netdev_adjacent_change_prepare(struct net_device *old_dev,
                    struct net_device *new_dev,
                    struct net_device *dev,
                    struct netlink_ext_ack *extack);
 void netdev_adjacent_change_commit(struct net_device *old_dev,
                    struct net_device *new_dev,
                    struct net_device *dev);
 void netdev_adjacent_change_abort(struct net_device *old_dev,
                   struct net_device *new_dev,
                   struct net_device *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);
 void netdev_lower_state_changed(struct net_device *lower_dev,
                 void *lower_state_info);
 
 /* RSS keys are 40 or 52 bytes long */
 #define NETDEV_RSS_KEY_LEN 52
 extern u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;
 void netdev_rss_key_fill(void *buffer, size_t len);
 
 int skb_checksum_help(struct sk_buff *skb);
 int skb_crc32c_csum_help(struct sk_buff *skb);
 int skb_csum_hwoffload_help(struct sk_buff *skb,
                 const netdev_features_t features);
 
 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
                   netdev_features_t features, bool tx_path);
 struct sk_buff *skb_eth_gso_segment(struct sk_buff *skb,
                     netdev_features_t features, __be16 type);
 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
                     netdev_features_t features);
 
 struct netdev_bonding_info {
     ifslave slave;
     ifbond  master;
 };
 
 struct netdev_notifier_bonding_info {
     struct netdev_notifier_info info; /* must be first */
     struct netdev_bonding_info  bonding_info;
 };
 
 void netdev_bonding_info_change(struct net_device *dev,
                 struct netdev_bonding_info *bonding_info);
 
 #if IS_ENABLED(CONFIG_ETHTOOL_NETLINK)
 void ethtool_notify(struct net_device *dev, unsigned int cmd, const void *data);
 #else
 static inline void ethtool_notify(struct net_device *dev, unsigned int cmd,
                   const void *data)
 {
 }
 #endif
 
 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)
 {
     if (protocol == htons(ETH_P_FCOE))
         return !!(features & NETIF_F_FCOE_CRC);
 
     /* Assume this is an IP checksum (not SCTP CRC) */
 
     if (features & NETIF_F_HW_CSUM) {
         /* Can checksum everything */
         return true;
     }
 
     switch (protocol) {
     case htons(ETH_P_IP):
         return !!(features & NETIF_F_IP_CSUM);
     case htons(ETH_P_IPV6):
         return !!(features & NETIF_F_IPV6_CSUM);
     default:
         return false;
     }
 }
 
 #ifdef CONFIG_BUG
 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb);
 #else
 static inline void netdev_rx_csum_fault(struct net_device *dev,
                     struct sk_buff *skb)
 {
 }
 #endif
 /* rx skb timestamps */
 void net_enable_timestamp(void);
 void net_disable_timestamp(void);
 
 static inline ktime_t netdev_get_tstamp(struct net_device *dev,
                     const struct skb_shared_hwtstamps *hwtstamps,
                     bool cycles)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
 
     if (ops->ndo_get_tstamp)
         return ops->ndo_get_tstamp(dev, hwtstamps, cycles);
 
     return hwtstamps->hwtstamp;
 }
 
 static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
                           struct sk_buff *skb, struct net_device *dev,
                           bool more)
 {
     __this_cpu_write(softnet_data.xmit.more, more);
     return ops->ndo_start_xmit(skb, dev);
 }
 
 static inline bool netdev_xmit_more(void)
 {
     return __this_cpu_read(softnet_data.xmit.more);
 }
 
 static inline netdev_tx_t netdev_start_xmit(struct sk_buff *skb, struct net_device *dev,
                         struct netdev_queue *txq, bool more)
 {
     const struct net_device_ops *ops = dev->netdev_ops;
     netdev_tx_t rc;
 
     rc = __netdev_start_xmit(ops, skb, dev, more);
     if (rc == NETDEV_TX_OK)
         txq_trans_update(txq);
 
     return rc;
 }
 
 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
                 const void *ns);
 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
                  const void *ns);
 
 extern const struct kobj_ns_type_operations net_ns_type_operations;
 
 const char *netdev_drivername(const struct net_device *dev);
 
 static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
                               netdev_features_t f2)
 {
     if ((f1 ^ f2) & NETIF_F_HW_CSUM) {
         if (f1 & NETIF_F_HW_CSUM)
             f1 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
         else
             f2 |= (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
     }
 
     return f1 & f2;
 }
 
 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 passthru_features_check(struct sk_buff *skb,
                       struct net_device *dev,
                       netdev_features_t features);
 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 = (netdev_features_t)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_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_TCP_FIXEDID != (NETIF_F_TSO_MANGLEID >> 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_IPXIP4  != (NETIF_F_GSO_IPXIP4 >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_IPXIP6  != (NETIF_F_GSO_IPXIP6 >> 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_PARTIAL != (NETIF_F_GSO_PARTIAL >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_TUNNEL_REMCSUM != (NETIF_F_GSO_TUNNEL_REMCSUM >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_SCTP    != (NETIF_F_GSO_SCTP >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_ESP != (NETIF_F_GSO_ESP >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_GSO_UDP >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_UDP_L4 != (NETIF_F_GSO_UDP_L4 >> NETIF_F_GSO_SHIFT));
     BUILD_BUG_ON(SKB_GSO_FRAGLIST != (NETIF_F_GSO_FRAGLIST >> 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)));
 }
 
 void netif_set_tso_max_size(struct net_device *dev, unsigned int size);
 void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs);
 void netif_inherit_tso_max(struct net_device *to,
                const struct net_device *from);
 
 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_macsec(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_MACSEC;
 }
 
 static inline bool netif_is_macvlan(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_MACVLAN;
 }
 
 static inline bool netif_is_macvlan_port(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_MACVLAN_PORT;
 }
 
 static inline bool netif_is_bond_master(const struct net_device *dev)
 {
     return dev->flags & IFF_MASTER && dev->priv_flags & IFF_BONDING;
 }
 
 static inline bool netif_is_bond_slave(const 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;
 }
 
 static inline bool netif_has_l3_rx_handler(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_L3MDEV_RX_HANDLER;
 }
 
 static inline bool netif_is_l3_master(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_L3MDEV_MASTER;
 }
 
 static inline bool netif_is_l3_slave(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_L3MDEV_SLAVE;
 }
 
 static inline bool netif_is_bridge_master(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_EBRIDGE;
 }
 
 static inline bool netif_is_bridge_port(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_BRIDGE_PORT;
 }
 
 static inline bool netif_is_ovs_master(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_OPENVSWITCH;
 }
 
 static inline bool netif_is_ovs_port(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_OVS_DATAPATH;
 }
 
 static inline bool netif_is_any_bridge_port(const struct net_device *dev)
 {
     return netif_is_bridge_port(dev) || netif_is_ovs_port(dev);
 }
 
 static inline bool netif_is_team_master(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_TEAM;
 }
 
 static inline bool netif_is_team_port(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_TEAM_PORT;
 }
 
 static inline bool netif_is_lag_master(const struct net_device *dev)
 {
     return netif_is_bond_master(dev) || netif_is_team_master(dev);
 }
 
 static inline bool netif_is_lag_port(const struct net_device *dev)
 {
     return netif_is_bond_slave(dev) || netif_is_team_port(dev);
 }
 
 static inline bool netif_is_rxfh_configured(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_RXFH_CONFIGURED;
 }
 
 static inline bool netif_is_failover(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_FAILOVER;
 }
 
 static inline bool netif_is_failover_slave(const struct net_device *dev)
 {
     return dev->priv_flags & IFF_FAILOVER_SLAVE;
 }
 
 /* This device needs to keep skb dst for qdisc enqueue or ndo_start_xmit() */
 static inline void netif_keep_dst(struct net_device *dev)
 {
     dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM);
 }
 
 /* return true if dev can't cope with mtu frames that need vlan tag insertion */
 static inline bool netif_reduces_vlan_mtu(struct net_device *dev)
 {
     /* TODO: reserve and use an additional IFF bit, if we get more users */
     return netif_is_macsec(dev);
 }
 
 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->name[0] || strchr(dev->name, '%'))
         return "(unnamed net_device)";
     return dev->name;
 }
 
 static inline bool netdev_unregistering(const struct net_device *dev)
 {
     return dev->reg_state == NETREG_UNREGISTERING;
 }
 
 static inline const char *netdev_reg_state(const struct net_device *dev)
 {
     switch (dev->reg_state) {
     case NETREG_UNINITIALIZED: return " (uninitialized)";
     case NETREG_REGISTERED: return "";
     case NETREG_UNREGISTERING: return " (unregistering)";
     case NETREG_UNREGISTERED: return " (unregistered)";
     case NETREG_RELEASED: return " (released)";
     case NETREG_DUMMY: return " (dummy)";
     }
 
     WARN_ONCE(1, "%s: unknown reg_state %d\n", dev->name, dev->reg_state);
     return " (unknown)";
 }
 
 #define MODULE_ALIAS_NETDEV(device) \
     MODULE_ALIAS("netdev-" device)
 
 /*
  * 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%s: " format, netdev_name(dev),   \
          netdev_reg_state(dev), ##args)
 
 #define netdev_WARN_ONCE(dev, format, args...)              \
     WARN_ONCE(1, "netdevice: %s%s: " format, netdev_name(dev),  \
           netdev_reg_state(dev), ##args)
 
 /*
  *  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.
  *
  *      0800    IP
  *      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)
 
 extern struct list_head ptype_all __read_mostly;
 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
 
 extern struct net_device *blackhole_netdev;
 
 #endif  /* _LINUX_NETDEVICE_H */