neigh: Add infrastructure for allocating device neigh privates.

[deliverable/linux.git] / include / linux / netdevice.h

/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the Interfaces handler.
 *
 * Version:     @(#)dev.h       1.0.10  08/12/93
 *
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *              Corey Minyard <wf-rch!minyard@relay.EU.net>
 *              Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
 *              Alan Cox, <alan@lxorguk.ukuu.org.uk>
 *              Bjorn Ekwall. <bj0rn@blox.se>
 *              Pekka Riikonen <priikone@poseidon.pspt.fi>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *              Moved to /usr/include/linux for NET3
 */
#ifndef _LINUX_NETDEVICE_H
#define _LINUX_NETDEVICE_H

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_link.h>

#ifdef __KERNEL__
#include <linux/pm_qos.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <asm/cache.h>
#include <asm/byteorder.h>

#include <linux/device.h>
#include <linux/percpu.h>
#include <linux/rculist.h>
#include <linux/dmaengine.h>
#include <linux/workqueue.h>
#include <linux/dynamic_queue_limits.h>

#include <linux/ethtool.h>
#include <net/net_namespace.h>
#include <net/dsa.h>
#ifdef CONFIG_DCB
#include <net/dcbnl.h>
#endif
#include <net/netprio_cgroup.h>

#include <linux/netdev_features.h>

struct vlan_group;
struct netpoll_info;
struct phy_device;
/* 802.11 specific */
struct wireless_dev;
                                        /* source back-compat hooks */
#define SET_ETHTOOL_OPS(netdev,ops) \
        ( (netdev)->ethtool_ops = (ops) )

/* hardware address assignment types */
#define NET_ADDR_PERM           0       /* address is permanent (default) */
#define NET_ADDR_RANDOM         1       /* address is generated randomly */
#define NET_ADDR_STOLEN         2       /* address is stolen from other device */

/* Backlog congestion levels */
#define NET_RX_SUCCESS          0       /* keep 'em coming, baby */
#define NET_RX_DROP             1       /* packet dropped */

/*
 * Transmit return codes: transmit return codes originate from three different
 * namespaces:
 *
 * - qdisc return codes
 * - driver transmit return codes
 * - errno values
 *
 * Drivers are allowed to return any one of those in their hard_start_xmit()
 * function. Real network devices commonly used with qdiscs should only return
 * the driver transmit return codes though - when qdiscs are used, the actual
 * transmission happens asynchronously, so the value is not propagated to
 * higher layers. Virtual network devices transmit synchronously, in this case
 * the driver transmit return codes are consumed by dev_queue_xmit(), all
 * others are propagated to higher layers.
 */

/* qdisc ->enqueue() return codes. */
#define NET_XMIT_SUCCESS        0x00
#define NET_XMIT_DROP           0x01    /* skb dropped                  */
#define NET_XMIT_CN             0x02    /* congestion notification      */
#define NET_XMIT_POLICED        0x03    /* skb is shot by police        */
#define NET_XMIT_MASK           0x0f    /* qdisc flags in net/sch_generic.h */

/* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
 * indicates that the device will soon be dropping packets, or already drops
 * some packets of the same priority; prompting us to send less aggressively. */
#define net_xmit_eval(e)        ((e) == NET_XMIT_CN ? 0 : (e))
#define net_xmit_errno(e)       ((e) != NET_XMIT_CN ? -ENOBUFS : 0)

/* Driver transmit return codes */
#define NETDEV_TX_MASK          0xf0

enum netdev_tx {
        __NETDEV_TX_MIN  = INT_MIN,     /* make sure enum is signed */
        NETDEV_TX_OK     = 0x00,        /* driver took care of packet */
        NETDEV_TX_BUSY   = 0x10,        /* driver tx path was busy*/
        NETDEV_TX_LOCKED = 0x20,        /* driver tx lock was already taken */
};
typedef enum netdev_tx netdev_tx_t;

/*
 * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
 * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
 */
static inline bool dev_xmit_complete(int rc)
{
        /*
         * Positive cases with an skb consumed by a driver:
         * - successful transmission (rc == NETDEV_TX_OK)
         * - error while transmitting (rc < 0)
         * - error while queueing to a different device (rc & NET_XMIT_MASK)
         */
        if (likely(rc < NET_XMIT_MASK))
                return true;

        return false;
}

#endif

#define MAX_ADDR_LEN    32              /* Largest hardware address length */

/* Initial net device group. All devices belong to group 0 by default. */
#define INIT_NETDEV_GROUP       0

#ifdef  __KERNEL__
/*
 *      Compute the worst case header length according to the protocols
 *      used.
 */

#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
# if defined(CONFIG_MAC80211_MESH)
#  define LL_MAX_HEADER 128
# else
#  define LL_MAX_HEADER 96
# endif
#elif IS_ENABLED(CONFIG_TR)
# define LL_MAX_HEADER 48
#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;
};

#endif  /*  __KERNEL__  */


/* Media selection options. */
enum {
        IF_PORT_UNKNOWN = 0,
        IF_PORT_10BASE2,
        IF_PORT_10BASET,
        IF_PORT_AUI,
        IF_PORT_100BASET,
        IF_PORT_100BASETX,
        IF_PORT_100BASEFX
};

#ifdef __KERNEL__

#include <linux/cache.h>
#include <linux/skbuff.h>

#ifdef CONFIG_RPS
#include <linux/jump_label.h>
extern struct jump_label_key rps_needed;
#endif

struct neighbour;
struct neigh_parms;
struct sk_buff;

struct netdev_hw_addr {
        struct list_head        list;
        unsigned char           addr[MAX_ADDR_LEN];
        unsigned char           type;
#define NETDEV_HW_ADDR_T_LAN            1
#define NETDEV_HW_ADDR_T_SAN            2
#define NETDEV_HW_ADDR_T_SLAVE          3
#define NETDEV_HW_ADDR_T_UNICAST        4
#define NETDEV_HW_ADDR_T_MULTICAST      5
        bool                    synced;
        bool                    global_use;
        int                     refcount;
        struct rcu_head         rcu_head;
};

struct netdev_hw_addr_list {
        struct list_head        list;
        int                     count;
};

#define netdev_hw_addr_list_count(l) ((l)->count)
#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
#define netdev_hw_addr_list_for_each(ha, l) \
        list_for_each_entry(ha, &(l)->list, list)

#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
#define netdev_for_each_uc_addr(ha, dev) \
        netdev_hw_addr_list_for_each(ha, &(dev)->uc)

#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
#define netdev_for_each_mc_addr(ha, dev) \
        netdev_hw_addr_list_for_each(ha, &(dev)->mc)

struct hh_cache {
        u16             hh_len;
        u16             __pad;
        seqlock_t       hh_lock;

        /* cached hardware header; allow for machine alignment needs.        */
#define HH_DATA_MOD     16
#define HH_DATA_OFF(__len) \
        (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
#define HH_DATA_ALIGN(__len) \
        (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
        unsigned long   hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
};

/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 * Alternative is:
 *   dev->hard_header_len ? (dev->hard_header_len +
 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 *
 * We could use other alignment values, but we must maintain the
 * relationship HH alignment <= LL alignment.
 */
#define LL_RESERVED_SPACE(dev) \
        ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
        ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)

struct header_ops {
        int     (*create) (struct sk_buff *skb, struct net_device *dev,
                           unsigned short type, const void *daddr,
                           const void *saddr, unsigned len);
        int     (*parse)(const struct sk_buff *skb, unsigned char *haddr);
        int     (*rebuild)(struct sk_buff *skb);
        int     (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
        void    (*cache_update)(struct hh_cache *hh,
                                const struct net_device *dev,
                                const unsigned char *haddr);
};

/* These flag bits are private to the generic network queueing
 * layer, they may not be explicitly referenced by any other
 * code.
 */

enum netdev_state_t {
        __LINK_STATE_START,
        __LINK_STATE_PRESENT,
        __LINK_STATE_NOCARRIER,
        __LINK_STATE_LINKWATCH_PENDING,
        __LINK_STATE_DORMANT,
};


/*
 * This structure holds at boot time configured netdevice settings. They
 * are then used in the device probing.
 */
struct netdev_boot_setup {
        char name[IFNAMSIZ];
        struct ifmap map;
};
#define NETDEV_BOOT_SETUP_MAX 8

extern int __init netdev_boot_setup(char *str);

/*
 * Structure for NAPI scheduling similar to tasklet but with weighting
 */
struct napi_struct {
        /* The poll_list must only be managed by the entity which
         * changes the state of the NAPI_STATE_SCHED bit.  This means
         * whoever atomically sets that bit can add this napi_struct
         * to the per-cpu poll_list, and whoever clears that bit
         * can remove from the list right before clearing the bit.
         */
        struct list_head        poll_list;

        unsigned long           state;
        int                     weight;
        int                     (*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
        spinlock_t              poll_lock;
        int                     poll_owner;
#endif

        unsigned int            gro_count;

        struct net_device       *dev;
        struct list_head        dev_list;
        struct sk_buff          *gro_list;
        struct sk_buff          *skb;
};

enum {
        NAPI_STATE_SCHED,       /* Poll is scheduled */
        NAPI_STATE_DISABLE,     /* Disable pending */
        NAPI_STATE_NPSVC,       /* Netpoll - don't dequeue from poll_list */
};

enum gro_result {
        GRO_MERGED,
        GRO_MERGED_FREE,
        GRO_HELD,
        GRO_NORMAL,
        GRO_DROP,
};
typedef enum gro_result gro_result_t;

/*
 * enum rx_handler_result - Possible return values for rx_handlers.
 * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
 * further.
 * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
 * case skb->dev was changed by rx_handler.
 * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
 * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
 *
 * rx_handlers are functions called from inside __netif_receive_skb(), to do
 * special processing of the skb, prior to delivery to protocol handlers.
 *
 * Currently, a net_device can only have a single rx_handler registered. Trying
 * to register a second rx_handler will return -EBUSY.
 *
 * To register a rx_handler on a net_device, use netdev_rx_handler_register().
 * To unregister a rx_handler on a net_device, use
 * netdev_rx_handler_unregister().
 *
 * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
 * do with the skb.
 *
 * If the rx_handler consumed to skb in some way, it should return
 * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
 * the skb to be delivered in some other ways.
 *
 * If the rx_handler changed skb->dev, to divert the skb to another
 * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
 * new device will be called if it exists.
 *
 * If the rx_handler consider the skb should be ignored, it should return
 * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
 * are registred on exact device (ptype->dev == skb->dev).
 *
 * If the rx_handler didn't changed skb->dev, but want the skb to be normally
 * delivered, it should return RX_HANDLER_PASS.
 *
 * A device without a registered rx_handler will behave as if rx_handler
 * returned RX_HANDLER_PASS.
 */

enum rx_handler_result {
        RX_HANDLER_CONSUMED,
        RX_HANDLER_ANOTHER,
        RX_HANDLER_EXACT,
        RX_HANDLER_PASS,
};
typedef enum rx_handler_result rx_handler_result_t;
typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);

extern void __napi_schedule(struct napi_struct *n);

static inline int napi_disable_pending(struct napi_struct *n)
{
        return test_bit(NAPI_STATE_DISABLE, &n->state);
}

/**
 *      napi_schedule_prep - check if napi can be scheduled
 *      @n: napi context
 *
 * Test if NAPI routine is already running, and if not mark
 * it as running.  This is used as a condition variable
 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
 */
static inline int napi_schedule_prep(struct napi_struct *n)
{
        return !napi_disable_pending(n) &&
                !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
}

/**
 *      napi_schedule - schedule NAPI poll
 *      @n: napi context
 *
 * Schedule NAPI poll routine to be called if it is not already
 * running.
 */
static inline void napi_schedule(struct napi_struct *n)
{
        if (napi_schedule_prep(n))
                __napi_schedule(n);
}

/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
static inline int napi_reschedule(struct napi_struct *napi)
{
        if (napi_schedule_prep(napi)) {
                __napi_schedule(napi);
                return 1;
        }
        return 0;
}

/**
 *      napi_complete - NAPI processing complete
 *      @n: napi context
 *
 * Mark NAPI processing as complete.
 */
extern void __napi_complete(struct napi_struct *n);
extern void napi_complete(struct napi_struct *n);

/**
 *      napi_disable - prevent NAPI from scheduling
 *      @n: napi context
 *
 * Stop NAPI from being scheduled on this context.
 * Waits till any outstanding processing completes.
 */
static inline void napi_disable(struct napi_struct *n)
{
        set_bit(NAPI_STATE_DISABLE, &n->state);
        while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
                msleep(1);
        clear_bit(NAPI_STATE_DISABLE, &n->state);
}

/**
 *      napi_enable - enable NAPI scheduling
 *      @n: napi context
 *
 * Resume NAPI from being scheduled on this context.
 * Must be paired with napi_disable.
 */
static inline void napi_enable(struct napi_struct *n)
{
        BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
        smp_mb__before_clear_bit();
        clear_bit(NAPI_STATE_SCHED, &n->state);
}

#ifdef CONFIG_SMP
/**
 *      napi_synchronize - wait until NAPI is not running
 *      @n: napi context
 *
 * Wait until NAPI is done being scheduled on this context.
 * Waits till any outstanding processing completes but
 * does not disable future activations.
 */
static inline void napi_synchronize(const struct napi_struct *n)
{
        while (test_bit(NAPI_STATE_SCHED, &n->state))
                msleep(1);
}
#else
# define napi_synchronize(n)    barrier()
#endif

enum netdev_queue_state_t {
        __QUEUE_STATE_DRV_XOFF,
        __QUEUE_STATE_STACK_XOFF,
        __QUEUE_STATE_FROZEN,
#define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF)             | \
                              (1 << __QUEUE_STATE_STACK_XOFF))
#define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF            | \
                                        (1 << __QUEUE_STATE_FROZEN))
};
/*
 * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue.  The
 * netif_tx_* functions below are used to manipulate this flag.  The
 * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
 * queue independently.  The netif_xmit_*stopped functions below are called
 * to check if the queue has been stopped by the driver or stack (either
 * of the XOFF bits are set in the state).  Drivers should not need to call
 * netif_xmit*stopped functions, they should only be using netif_tx_*.
 */

struct netdev_queue {
/*
 * read mostly part
 */
        struct net_device       *dev;
        struct Qdisc            *qdisc;
        struct Qdisc            *qdisc_sleeping;
#ifdef CONFIG_SYSFS
        struct kobject          kobj;
#endif
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
        int                     numa_node;
#endif
/*
 * write mostly part
 */
        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
        int                     xmit_lock_owner;
        /*
         * please use this field instead of dev->trans_start
         */
        unsigned long           trans_start;

        /*
         * Number of TX timeouts for this queue
         * (/sys/class/net/DEV/Q/trans_timeout)
         */
        unsigned long           trans_timeout;

        unsigned long           state;

#ifdef CONFIG_BQL
        struct dql              dql;
#endif
} ____cacheline_aligned_in_smp;

static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
        return q->numa_node;
#else
        return NUMA_NO_NODE;
#endif
}

static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
        q->numa_node = node;
#endif
}

#ifdef CONFIG_RPS
/*
 * This structure holds an RPS map which can be of variable length.  The
 * map is an array of CPUs.
 */
struct rps_map {
        unsigned int len;
        struct rcu_head rcu;
        u16 cpus[0];
};
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))

/*
 * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
 * tail pointer for that CPU's input queue at the time of last enqueue, and
 * a hardware filter index.
 */
struct rps_dev_flow {
        u16 cpu;
        u16 filter;
        unsigned int last_qtail;
};
#define RPS_NO_FILTER 0xffff

/*
 * The rps_dev_flow_table structure contains a table of flow mappings.
 */
struct rps_dev_flow_table {
        unsigned int mask;
        struct rcu_head rcu;
        struct work_struct free_work;
        struct rps_dev_flow flows[0];
};
#define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
    (_num * sizeof(struct rps_dev_flow)))

/*
 * The rps_sock_flow_table contains mappings of flows to the last CPU
 * on which they were processed by the application (set in recvmsg).
 */
struct rps_sock_flow_table {
        unsigned int mask;
        u16 ents[0];
};
#define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
    (_num * sizeof(u16)))

#define RPS_NO_CPU 0xffff

static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
                                        u32 hash)
{
        if (table && hash) {
                unsigned int cpu, index = hash & table->mask;

                /* We only give a hint, preemption can change cpu under us */
                cpu = raw_smp_processor_id();

                if (table->ents[index] != cpu)
                        table->ents[index] = cpu;
        }
}

static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
                                       u32 hash)
{
        if (table && hash)
                table->ents[hash & table->mask] = RPS_NO_CPU;
}

extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;

#ifdef CONFIG_RFS_ACCEL
extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
                                u32 flow_id, u16 filter_id);
#endif

/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
        struct rps_map __rcu            *rps_map;
        struct rps_dev_flow_table __rcu *rps_flow_table;
        struct kobject                  kobj;
        struct net_device               *dev;
} ____cacheline_aligned_in_smp;
#endif /* CONFIG_RPS */

#ifdef CONFIG_XPS
/*
 * This structure holds an XPS map which can be of variable length.  The
 * map is an array of queues.
 */
struct xps_map {
        unsigned int len;
        unsigned int alloc_len;
        struct rcu_head rcu;
        u16 queues[0];
};
#define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + (_num * sizeof(u16)))
#define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map))    \
    / sizeof(u16))

/*
 * This structure holds all XPS maps for device.  Maps are indexed by CPU.
 */
struct xps_dev_maps {
        struct rcu_head rcu;
        struct xps_map __rcu *cpu_map[0];
};
#define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) +                \
    (nr_cpu_ids * sizeof(struct xps_map *)))
#endif /* CONFIG_XPS */

#define TC_MAX_QUEUE    16
#define TC_BITMASK      15
/* HW offloaded queuing disciplines txq count and offset maps */
struct netdev_tc_txq {
        u16 count;
        u16 offset;
};

/*
 * This structure defines the management hooks for network devices.
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
 *
 * int (*ndo_init)(struct net_device *dev);
 *     This function is called once when network device is registered.
 *     The network device can use this to any late stage initializaton
 *     or semantic validattion. It can fail with an error code which will
 *     be propogated back to register_netdev
 *
 * void (*ndo_uninit)(struct net_device *dev);
 *     This function is called when device is unregistered or when registration
 *     fails. It is not called if init fails.
 *
 * int (*ndo_open)(struct net_device *dev);
 *     This function is called when network device transistions to the up
 *     state.
 *
 * int (*ndo_stop)(struct net_device *dev);
 *     This function is called when network device transistions to the down
 *     state.
 *
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
 *      Called when a packet needs to be transmitted.
 *      Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
 *      Required can not be NULL.
 *
 * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
 *      Called to decide which queue to when device supports multiple
 *      transmit queues.
 *
 * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
 *      This function is called to allow device receiver to make
 *      changes to configuration when multicast or promiscious is enabled.
 *
 * void (*ndo_set_rx_mode)(struct net_device *dev);
 *      This function is called device changes address list filtering.
 *      If driver handles unicast address filtering, it should set
 *      IFF_UNICAST_FLT to its priv_flags.
 *
 * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
 *      This function  is called when the Media Access Control address
 *      needs to be changed. If this interface is not defined, the
 *      mac address can not be changed.
 *
 * int (*ndo_validate_addr)(struct net_device *dev);
 *      Test if Media Access Control address is valid for the device.
 *
 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 *      Called when a user request an ioctl which can't be handled by
 *      the generic interface code. If not defined ioctl's return
 *      not supported error code.
 *
 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 *      Used to set network devices bus interface parameters. This interface
 *      is retained for legacy reason, new devices should use the bus
 *      interface (PCI) for low level management.
 *
 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 *      Called when a user wants to change the Maximum Transfer Unit
 *      of a device. If not defined, any request to change MTU will
 *      will return an error.
 *
 * void (*ndo_tx_timeout)(struct net_device *dev);
 *      Callback uses when the transmitter has not made any progress
 *      for dev->watchdog ticks.
 *
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
 *                      struct rtnl_link_stats64 *storage);
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
 *      Called when a user wants to get the network device usage
 *      statistics. Drivers must do one of the following:
 *      1. Define @ndo_get_stats64 to fill in a zero-initialised
 *         rtnl_link_stats64 structure passed by the caller.
 *      2. Define @ndo_get_stats to update a net_device_stats structure
 *         (which should normally be dev->stats) and return a pointer to
 *         it. The structure may be changed asynchronously only if each
 *         field is written atomically.
 *      3. Update dev->stats asynchronously and atomically, and define
 *         neither operation.
 *
 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *      this function is called when a VLAN id is registered.
 *
 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 *      If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *      this function is called when a VLAN id is unregistered.
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
 *
 *      SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *                          int vf, struct ifla_vf_info *ivf);
 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *                        struct nlattr *port[]);
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 *      Called to setup 'tc' number of traffic classes in the net device. This
 *      is always called from the stack with the rtnl lock held and netif tx
 *      queues stopped. This allows the netdevice to perform queue management
 *      safely.
 *
 *      Fiber Channel over Ethernet (FCoE) offload functions.
 * int (*ndo_fcoe_enable)(struct net_device *dev);
 *      Called when the FCoE protocol stack wants to start using LLD for FCoE
 *      so the underlying device can perform whatever needed configuration or
 *      initialization to support acceleration of FCoE traffic.
 *
 * int (*ndo_fcoe_disable)(struct net_device *dev);
 *      Called when the FCoE protocol stack wants to stop using LLD for FCoE
 *      so the underlying device can perform whatever needed clean-ups to
 *      stop supporting acceleration of FCoE traffic.
 *
 * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
 *                           struct scatterlist *sgl, unsigned int sgc);
 *      Called when the FCoE Initiator wants to initialize an I/O that
 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 *      perform necessary setup and returns 1 to indicate the device is set up
 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 *
 * int (*ndo_fcoe_ddp_done)(struct net_device *dev,  u16 xid);
 *      Called when the FCoE Initiator/Target is done with the DDPed I/O as
 *      indicated by the FC exchange id 'xid', so the underlying device can
 *      clean up and reuse resources for later DDP requests.
 *
 * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
 *                            struct scatterlist *sgl, unsigned int sgc);
 *      Called when the FCoE Target wants to initialize an I/O that
 *      is a possible candidate for Direct Data Placement (DDP). The LLD can
 *      perform necessary setup and returns 1 to indicate the device is set up
 *      successfully to perform DDP on this I/O, otherwise this returns 0.
 *
 * int (*ndo_fcoe_get_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). User should
 *      call netdev_set_master() to set dev->master properly.
 * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
 *      Called to make another netdev an underling.
 *
 * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
 *      Called to release previously enslaved netdev.
 *
 *      Feature/offload setting functions.
 * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
 *              netdev_features_t features);
 *      Adjusts the requested feature flags according to device-specific
 *      constraints, and returns the resulting flags. Must not modify
 *      the device state.
 *
 * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
 *      Called to update device configuration to new features. Passed
 *      feature set might be less than what was returned by ndo_fix_features()).
 *      Must return >0 or -errno if it changed dev->features itself.
 *
 */
struct net_device_ops {
        int                     (*ndo_init)(struct net_device *dev);
        void                    (*ndo_uninit)(struct net_device *dev);
        int                     (*ndo_open)(struct net_device *dev);
        int                     (*ndo_stop)(struct net_device *dev);
        netdev_tx_t             (*ndo_start_xmit) (struct sk_buff *skb,
                                                   struct net_device *dev);
        u16                     (*ndo_select_queue)(struct net_device *dev,
                                                    struct sk_buff *skb);
        void                    (*ndo_change_rx_flags)(struct net_device *dev,
                                                       int flags);
        void                    (*ndo_set_rx_mode)(struct net_device *dev);
        int                     (*ndo_set_mac_address)(struct net_device *dev,
                                                       void *addr);
        int                     (*ndo_validate_addr)(struct net_device *dev);
        int                     (*ndo_do_ioctl)(struct net_device *dev,
                                                struct ifreq *ifr, int cmd);
        int                     (*ndo_set_config)(struct net_device *dev,
                                                  struct ifmap *map);
        int                     (*ndo_change_mtu)(struct net_device *dev,
                                                  int new_mtu);
        int                     (*ndo_neigh_setup)(struct net_device *dev,
                                                   struct neigh_parms *);
        void                    (*ndo_tx_timeout) (struct net_device *dev);

        struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
                                                     struct rtnl_link_stats64 *storage);
        struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

        void                    (*ndo_vlan_rx_add_vid)(struct net_device *dev,
                                                       unsigned short vid);
        void                    (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
                                                        unsigned short 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);
        int                     (*ndo_set_vf_tx_rate)(struct net_device *dev,
                                                      int vf, int rate);
        int                     (*ndo_set_vf_spoofchk)(struct net_device *dev,
                                                       int vf, bool setting);
        int                     (*ndo_get_vf_config)(struct net_device *dev,
                                                     int vf,
                                                     struct ifla_vf_info *ivf);
        int                     (*ndo_set_vf_port)(struct net_device *dev,
                                                   int vf,
                                                   struct nlattr *port[]);
        int                     (*ndo_get_vf_port)(struct net_device *dev,
                                                   int vf, struct sk_buff *skb);
        int                     (*ndo_setup_tc)(struct net_device *dev, u8 tc);
#if IS_ENABLED(CONFIG_FCOE)
        int                     (*ndo_fcoe_enable)(struct net_device *dev);
        int                     (*ndo_fcoe_disable)(struct net_device *dev);
        int                     (*ndo_fcoe_ddp_setup)(struct net_device *dev,
                                                      u16 xid,
                                                      struct scatterlist *sgl,
                                                      unsigned int sgc);
        int                     (*ndo_fcoe_ddp_done)(struct net_device *dev,
                                                     u16 xid);
        int                     (*ndo_fcoe_ddp_target)(struct net_device *dev,
                                                       u16 xid,
                                                       struct scatterlist *sgl,
                                                       unsigned int sgc);
#endif

#if IS_ENABLED(CONFIG_LIBFCOE)
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
        int                     (*ndo_fcoe_get_wwn)(struct net_device *dev,
                                                    u64 *wwn, int type);
#endif

#ifdef CONFIG_RFS_ACCEL
        int                     (*ndo_rx_flow_steer)(struct net_device *dev,
                                                     const struct sk_buff *skb,
                                                     u16 rxq_index,
                                                     u32 flow_id);
#endif
        int                     (*ndo_add_slave)(struct net_device *dev,
                                                 struct net_device *slave_dev);
        int                     (*ndo_del_slave)(struct net_device *dev,
                                                 struct net_device *slave_dev);
        netdev_features_t       (*ndo_fix_features)(struct net_device *dev,
                                                    netdev_features_t features);
        int                     (*ndo_set_features)(struct net_device *dev,
                                                    netdev_features_t features);
};

/*
 *      The DEVICE structure.
 *      Actually, this whole structure is a big mistake.  It mixes I/O
 *      data with strictly "high-level" data, and it has to know about
 *      almost every data structure used in the INET module.
 *
 *      FIXME: cleanup struct net_device such that network protocol info
 *      moves out.
 */

struct net_device {

        /*
         * This is the first field of the "visible" part of this structure
         * (i.e. as seen by users in the "Space.c" file).  It is the name
         * of the interface.
         */
        char                    name[IFNAMSIZ];

        struct pm_qos_request   pm_qos_req;

        /* device name hash chain */
        struct hlist_node       name_hlist;
        /* snmp alias */
        char                    *ifalias;

        /*
         *      I/O specific fields
         *      FIXME: Merge these and struct ifmap into one
         */
        unsigned long           mem_end;        /* shared mem end       */
        unsigned long           mem_start;      /* shared mem start     */
        unsigned long           base_addr;      /* device I/O address   */
        unsigned int            irq;            /* device IRQ number    */

        /*
         *      Some hardware also needs these fields, but they are not
         *      part of the usual set specified in Space.c.
         */

        unsigned long           state;

        struct list_head        dev_list;
        struct list_head        napi_list;
        struct list_head        unreg_list;

        /* currently active device features */
        netdev_features_t       features;
        /* user-changeable features */
        netdev_features_t       hw_features;
        /* user-requested features */
        netdev_features_t       wanted_features;
        /* mask of features inheritable by VLAN devices */
        netdev_features_t       vlan_features;

        /* Interface index. Unique device identifier    */
        int                     ifindex;
        int                     iflink;

        struct net_device_stats stats;
        atomic_long_t           rx_dropped; /* dropped packets by core network
                                             * Do not use this in drivers.
                                             */

#ifdef CONFIG_WIRELESS_EXT
        /* List of functions to handle Wireless Extensions (instead of ioctl).
         * See <net/iw_handler.h> for details. Jean II */
        const struct iw_handler_def *   wireless_handlers;
        /* Instance data managed by the core of Wireless Extensions. */
        struct iw_public_data * wireless_data;
#endif
        /* Management operations */
        const struct net_device_ops *netdev_ops;
        const struct ethtool_ops *ethtool_ops;

        /* Hardware header description */
        const struct header_ops *header_ops;

        unsigned int            flags;  /* interface flags (a la BSD)   */
        unsigned int            priv_flags; /* Like 'flags' but invisible to userspace. */
        unsigned short          gflags;
        unsigned short          padded; /* How much padding added by alloc_netdev() */

        unsigned char           operstate; /* RFC2863 operstate */
        unsigned char           link_mode; /* mapping policy to operstate */

        unsigned char           if_port;        /* Selectable AUI, TP,..*/
        unsigned char           dma;            /* DMA channel          */

        unsigned int            mtu;    /* interface MTU value          */
        unsigned short          type;   /* interface hardware type      */
        unsigned short          hard_header_len;        /* hardware hdr length  */

        /* extra head- and tailroom the hardware may need, but not in all cases
         * can this be guaranteed, especially tailroom. Some cases also use
         * LL_MAX_HEADER instead to allocate the skb.
         */
        unsigned short          needed_headroom;
        unsigned short          needed_tailroom;

        /* Interface address info. */
        unsigned char           perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
        unsigned char           addr_assign_type; /* hw address assignment type */
        unsigned char           addr_len;       /* hardware address length      */
        unsigned char           neigh_priv_len;
        unsigned short          dev_id;         /* for shared network cards */

        spinlock_t              addr_list_lock;
        struct netdev_hw_addr_list      uc;     /* Unicast mac addresses */
        struct netdev_hw_addr_list      mc;     /* Multicast mac addresses */
        bool                    uc_promisc;
        unsigned int            promiscuity;
        unsigned int            allmulti;


        /* Protocol specific pointers */

#if IS_ENABLED(CONFIG_VLAN_8021Q)
        struct vlan_group __rcu *vlgrp;         /* VLAN group */
#endif
#if IS_ENABLED(CONFIG_NET_DSA)
        struct dsa_switch_tree  *dsa_ptr;       /* dsa specific data */
#endif
        void                    *atalk_ptr;     /* AppleTalk link       */
        struct in_device __rcu  *ip_ptr;        /* IPv4 specific data   */
        struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
        struct inet6_dev __rcu  *ip6_ptr;       /* IPv6 specific data */
        void                    *ec_ptr;        /* Econet specific data */
        void                    *ax25_ptr;      /* AX.25 specific data */
        struct wireless_dev     *ieee80211_ptr; /* IEEE 802.11 specific data,
                                                   assign before registering */

/*
 * Cache lines mostly used on receive path (including eth_type_trans())
 */
        unsigned long           last_rx;        /* Time of last Rx
                                                 * This should not be set in
                                                 * drivers, unless really needed,
                                                 * because network stack (bonding)
                                                 * use it if/when necessary, to
                                                 * avoid dirtying this cache line.
                                                 */

        struct net_device       *master; /* Pointer to master device of a group,
                                          * which this device is member of.
                                          */

        /* Interface address info used in eth_type_trans() */
        unsigned char           *dev_addr;      /* hw address, (before bcast
                                                   because most packets are
                                                   unicast) */

        struct netdev_hw_addr_list      dev_addrs; /* list of device
                                                      hw addresses */

        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */

#ifdef CONFIG_SYSFS
        struct kset             *queues_kset;
#endif

#ifdef CONFIG_RPS
        struct netdev_rx_queue  *_rx;

        /* Number of RX queues allocated at register_netdev() time */
        unsigned int            num_rx_queues;

        /* Number of RX queues currently active in device */
        unsigned int            real_num_rx_queues;

#ifdef CONFIG_RFS_ACCEL
        /* CPU reverse-mapping for RX completion interrupts, indexed
         * by RX queue number.  Assigned by driver.  This must only be
         * set if the ndo_rx_flow_steer operation is defined. */
        struct cpu_rmap         *rx_cpu_rmap;
#endif
#endif

        rx_handler_func_t __rcu *rx_handler;
        void __rcu              *rx_handler_data;

        struct netdev_queue __rcu *ingress_queue;

/*
 * Cache lines mostly used on transmit path
 */
        struct netdev_queue     *_tx ____cacheline_aligned_in_smp;

        /* Number of TX queues allocated at alloc_netdev_mq() time  */
        unsigned int            num_tx_queues;

        /* Number of TX queues currently active in device  */
        unsigned int            real_num_tx_queues;

        /* root qdisc from userspace point of view */
        struct Qdisc            *qdisc;

        unsigned long           tx_queue_len;   /* Max frames per queue allowed */
        spinlock_t              tx_global_lock;

#ifdef CONFIG_XPS
        struct xps_dev_maps __rcu *xps_maps;
#endif

        /* These may be needed for future network-power-down code. */

        /*
         * trans_start here is expensive for high speed devices on SMP,
         * please use netdev_queue->trans_start instead.
         */
        unsigned long           trans_start;    /* Time (in jiffies) of last Tx */

        int                     watchdog_timeo; /* used by dev_watchdog() */
        struct timer_list       watchdog_timer;

        /* Number of references to this device */
        int __percpu            *pcpu_refcnt;

        /* delayed register/unregister */
        struct list_head        todo_list;
        /* device index hash chain */
        struct hlist_node       index_hlist;

        struct list_head        link_watch_list;

        /* register/unregister state machine */
        enum { NETREG_UNINITIALIZED=0,
               NETREG_REGISTERED,       /* completed register_netdevice */
               NETREG_UNREGISTERING,    /* called unregister_netdevice */
               NETREG_UNREGISTERED,     /* completed unregister todo */
               NETREG_RELEASED,         /* called free_netdev */
               NETREG_DUMMY,            /* dummy device for NAPI poll */
        } reg_state:8;

        bool dismantle; /* device is going do be freed */

        enum {
                RTNL_LINK_INITIALIZED,
                RTNL_LINK_INITIALIZING,
        } rtnl_link_state:16;

        /* Called from unregister, can be used to call free_netdev */
        void (*destructor)(struct net_device *dev);

#ifdef CONFIG_NETPOLL
        struct netpoll_info     *npinfo;
#endif

#ifdef CONFIG_NET_NS
        /* Network namespace this network device is inside */
        struct net              *nd_net;
#endif

        /* mid-layer private */
        union {
                void                            *ml_priv;
                struct pcpu_lstats __percpu     *lstats; /* loopback stats */
                struct pcpu_tstats __percpu     *tstats; /* tunnel stats */
                struct pcpu_dstats __percpu     *dstats; /* dummy stats */
        };
        /* GARP */
        struct garp_port __rcu  *garp_port;

        /* class/net/name entry */
        struct device           dev;
        /* space for optional device, statistics, and wireless sysfs groups */
        const struct attribute_group *sysfs_groups[4];

        /* rtnetlink link ops */
        const struct rtnl_link_ops *rtnl_link_ops;

        /* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE            65536
        unsigned int            gso_max_size;

#ifdef CONFIG_DCB
        /* Data Center Bridging netlink ops */
        const struct dcbnl_rtnl_ops *dcbnl_ops;
#endif
        u8 num_tc;
        struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
        u8 prio_tc_map[TC_BITMASK + 1];

#if IS_ENABLED(CONFIG_FCOE)
        /* max exchange id for FCoE LRO by ddp */
        unsigned int            fcoe_ddp_xid;
#endif
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
        struct netprio_map __rcu *priomap;
#endif
        /* phy device may attach itself for hardware timestamping */
        struct phy_device *phydev;

        /* group the device belongs to */
        int group;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)

#define NETDEV_ALIGN            32

static inline
int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
{
        return dev->prio_tc_map[prio & TC_BITMASK];
}

static inline
int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
{
        if (tc >= dev->num_tc)
                return -EINVAL;

        dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
        return 0;
}

static inline
void netdev_reset_tc(struct net_device *dev)
{
        dev->num_tc = 0;
        memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
        memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
}

static inline
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
{
        if (tc >= dev->num_tc)
                return -EINVAL;

        dev->tc_to_txq[tc].count = count;
        dev->tc_to_txq[tc].offset = offset;
        return 0;
}

static inline
int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
{
        if (num_tc > TC_MAX_QUEUE)
                return -EINVAL;

        dev->num_tc = num_tc;
        return 0;
}

static inline
int netdev_get_num_tc(struct net_device *dev)
{
        return dev->num_tc;
}

static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
                                         unsigned int index)
{
        return &dev->_tx[index];
}

static inline void netdev_for_each_tx_queue(struct net_device *dev,
                                            void (*f)(struct net_device *,
                                                      struct netdev_queue *,
                                                      void *),
                                            void *arg)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++)
                f(dev, &dev->_tx[i], arg);
}

/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
        return read_pnet(&dev->nd_net);
}

static inline
void dev_net_set(struct net_device *dev, struct net *net)
{
#ifdef CONFIG_NET_NS
        release_net(dev->nd_net);
        dev->nd_net = hold_net(net);
#endif
}

static inline bool netdev_uses_dsa_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_DSA
        if (dev->dsa_ptr != NULL)
                return dsa_uses_dsa_tags(dev->dsa_ptr);
#endif

        return 0;
}

#ifndef CONFIG_NET_NS
static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
{
        skb->dev = dev;
}
#else /* CONFIG_NET_NS */
void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
#endif

static inline bool netdev_uses_trailer_tags(struct net_device *dev)
{
#ifdef CONFIG_NET_DSA_TAG_TRAILER
        if (dev->dsa_ptr != NULL)
                return dsa_uses_trailer_tags(dev->dsa_ptr);
#endif

        return 0;
}

/**
 *      netdev_priv - access network device private data
 *      @dev: network device
 *
 * Get network device private data
 */
static inline void *netdev_priv(const struct net_device *dev)
{
        return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))

/* Set the sysfs device type for the network logical device to allow
 * fin grained indentification of different network device types. For
 * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
 */
#define SET_NETDEV_DEVTYPE(net, devtype)        ((net)->dev.type = (devtype))

/**
 *      netif_napi_add - initialize a napi context
 *      @dev:  network device
 *      @napi: napi context
 *      @poll: polling function
 *      @weight: default weight
 *
 * netif_napi_add() must be used to initialize a napi context prior to calling
 * *any* of the other napi related functions.
 */
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
                    int (*poll)(struct napi_struct *, int), int weight);

/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
        /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
        void *frag0;

        /* Length of frag0. */
        unsigned int frag0_len;

        /* This indicates where we are processing relative to skb->data. */
        int data_offset;

        /* This is non-zero if the packet may be of the same flow. */
        int same_flow;

        /* This is non-zero if the packet cannot be merged with the new skb. */
        int flush;

        /* Number of segments aggregated. */
        int count;

        /* Free the skb? */
        int free;
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)

struct packet_type {
        __be16                  type;   /* This is really htons(ether_type). */
        struct net_device       *dev;   /* NULL is wildcarded here           */
        int                     (*func) (struct sk_buff *,
                                         struct net_device *,
                                         struct packet_type *,
                                         struct net_device *);
        struct sk_buff          *(*gso_segment)(struct sk_buff *skb,
                                                netdev_features_t features);
        int                     (*gso_send_check)(struct sk_buff *skb);
        struct sk_buff          **(*gro_receive)(struct sk_buff **head,
                                               struct sk_buff *skb);
        int                     (*gro_complete)(struct sk_buff *skb);
        void                    *af_packet_priv;
        struct list_head        list;
};

#include <linux/notifier.h>

/* netdevice notifier chain. Please remember to update the rtnetlink
 * notification exclusion list in rtnetlink_event() when adding new
 * types.
 */
#define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
#define NETDEV_DOWN     0x0002
#define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
                                   detected a hardware crash and restarted
                                   - we can use this eg to kick tcp sessions
                                   once done */
#define NETDEV_CHANGE   0x0004  /* Notify device state change */
#define NETDEV_REGISTER 0x0005
#define NETDEV_UNREGISTER       0x0006
#define NETDEV_CHANGEMTU        0x0007
#define NETDEV_CHANGEADDR       0x0008
#define NETDEV_GOING_DOWN       0x0009
#define NETDEV_CHANGENAME       0x000A
#define NETDEV_FEAT_CHANGE      0x000B
#define NETDEV_BONDING_FAILOVER 0x000C
#define NETDEV_PRE_UP           0x000D
#define NETDEV_PRE_TYPE_CHANGE  0x000E
#define NETDEV_POST_TYPE_CHANGE 0x000F
#define NETDEV_POST_INIT        0x0010
#define NETDEV_UNREGISTER_BATCH 0x0011
#define NETDEV_RELEASE          0x0012
#define NETDEV_NOTIFY_PEERS     0x0013
#define NETDEV_JOIN             0x0014

extern int register_netdevice_notifier(struct notifier_block *nb);
extern int unregister_netdevice_notifier(struct notifier_block *nb);
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);


extern rwlock_t                         dev_base_lock;          /* Device list lock */


#define for_each_netdev(net, d)         \
                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_reverse(net, d) \
                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_rcu(net, d)             \
                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_safe(net, d, n) \
                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
#define for_each_netdev_continue(net, d)                \
                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_continue_rcu(net, d)            \
        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
#define 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);
}

extern int                      netdev_boot_setup_check(struct net_device *dev);
extern unsigned long            netdev_boot_base(const char *prefix, int unit);
extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
                                              const char *hwaddr);
extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern void             dev_add_pack(struct packet_type *pt);
extern void             dev_remove_pack(struct packet_type *pt);
extern void             __dev_remove_pack(struct packet_type *pt);

extern struct net_device        *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
                                                      unsigned short mask);
extern struct net_device        *dev_get_by_name(struct net *net, const char *name);
extern struct net_device        *dev_get_by_name_rcu(struct net *net, const char *name);
extern struct net_device        *__dev_get_by_name(struct net *net, const char *name);
extern int              dev_alloc_name(struct net_device *dev, const char *name);
extern int              dev_open(struct net_device *dev);
extern int              dev_close(struct net_device *dev);
extern void             dev_disable_lro(struct net_device *dev);
extern int              dev_queue_xmit(struct sk_buff *skb);
extern int              register_netdevice(struct net_device *dev);
extern void             unregister_netdevice_queue(struct net_device *dev,
                                                   struct list_head *head);
extern void             unregister_netdevice_many(struct list_head *head);
static inline void unregister_netdevice(struct net_device *dev)
{
        unregister_netdevice_queue(dev, NULL);
}

extern int              netdev_refcnt_read(const struct net_device *dev);
extern void             free_netdev(struct net_device *dev);
extern void             synchronize_net(void);
extern int              init_dummy_netdev(struct net_device *dev);
extern void             netdev_resync_ops(struct net_device *dev);

extern struct net_device        *dev_get_by_index(struct net *net, int ifindex);
extern struct net_device        *__dev_get_by_index(struct net *net, int ifindex);
extern struct net_device        *dev_get_by_index_rcu(struct net *net, int ifindex);
extern int              dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int              netpoll_trap(void);
#endif
extern int             skb_gro_receive(struct sk_buff **head,
                                       struct sk_buff *skb);
extern void            skb_gro_reset_offset(struct sk_buff *skb);

static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
{
        return NAPI_GRO_CB(skb)->data_offset;
}

static inline unsigned int skb_gro_len(const struct sk_buff *skb)
{
        return skb->len - NAPI_GRO_CB(skb)->data_offset;
}

static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
{
        NAPI_GRO_CB(skb)->data_offset += len;
}

static inline void *skb_gro_header_fast(struct sk_buff *skb,
                                        unsigned int offset)
{
        return NAPI_GRO_CB(skb)->frag0 + offset;
}

static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
        return NAPI_GRO_CB(skb)->frag0_len < hlen;
}

static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
                                        unsigned int offset)
{
        if (!pskb_may_pull(skb, hlen))
                return NULL;

        NAPI_GRO_CB(skb)->frag0 = NULL;
        NAPI_GRO_CB(skb)->frag0_len = 0;
        return skb->data + offset;
}

static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
        return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
}

static inline void *skb_gro_network_header(struct sk_buff *skb)
{
        return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
               skb_network_offset(skb);
}

static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
                                  unsigned short type,
                                  const void *daddr, const void *saddr,
                                  unsigned 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);
}

typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
extern int              register_gifconf(unsigned int family, gifconf_func_t * gifconf);
static inline int unregister_gifconf(unsigned int family)
{
        return register_gifconf(family, NULL);
}

/*
 * Incoming packets are placed on per-cpu queues
 */
struct softnet_data {
        struct Qdisc            *output_queue;
        struct Qdisc            **output_queue_tailp;
        struct list_head        poll_list;
        struct sk_buff          *completion_queue;
        struct sk_buff_head     process_queue;

        /* stats */
        unsigned int            processed;
        unsigned int            time_squeeze;
        unsigned int            cpu_collision;
        unsigned int            received_rps;

#ifdef CONFIG_RPS
        struct softnet_data     *rps_ipi_list;

        /* Elements below can be accessed between CPUs for RPS */
        struct call_single_data csd ____cacheline_aligned_in_smp;
        struct softnet_data     *rps_ipi_next;
        unsigned int            cpu;
        unsigned int            input_queue_head;
        unsigned int            input_queue_tail;
#endif
        unsigned                dropped;
        struct sk_buff_head     input_pkt_queue;
        struct napi_struct      backlog;
};

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);

extern void __netif_schedule(struct Qdisc *q);

static inline void netif_schedule_queue(struct netdev_queue *txq)
{
        if (!(txq->state & QUEUE_STATE_ANY_XOFF))
                __netif_schedule(txq->qdisc);
}

static inline void netif_tx_schedule_all(struct net_device *dev)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++)
                netif_schedule_queue(netdev_get_tx_queue(dev, i));
}

static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
        clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}

/**
 *      netif_start_queue - allow transmit
 *      @dev: network device
 *
 *      Allow upper layers to call the device hard_start_xmit routine.
 */
static inline void netif_start_queue(struct net_device *dev)
{
        netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
}

static inline void netif_tx_start_all_queues(struct net_device *dev)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
                netif_tx_start_queue(txq);
        }
}

static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_NETPOLL_TRAP
        if (netpoll_trap()) {
                netif_tx_start_queue(dev_queue);
                return;
        }
#endif
        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
                __netif_schedule(dev_queue->qdisc);
}

/**
 *      netif_wake_queue - restart transmit
 *      @dev: network device
 *
 *      Allow upper layers to call the device hard_start_xmit routine.
 *      Used for flow control when transmit resources are available.
 */
static inline void netif_wake_queue(struct net_device *dev)
{
        netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
}

static inline void netif_tx_wake_all_queues(struct net_device *dev)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
                netif_tx_wake_queue(txq);
        }
}

static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
        if (WARN_ON(!dev_queue)) {
                pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
                return;
        }
        set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
}

/**
 *      netif_stop_queue - stop transmitted packets
 *      @dev: network device
 *
 *      Stop upper layers calling the device hard_start_xmit routine.
 *      Used for flow control when transmit resources are unavailable.
 */
static inline void netif_stop_queue(struct net_device *dev)
{
        netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
}

static inline void netif_tx_stop_all_queues(struct net_device *dev)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
                netif_tx_stop_queue(txq);
        }
}

static inline int 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 int netif_queue_stopped(const struct net_device *dev)
{
        return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
}

static inline int netif_xmit_stopped(const struct netdev_queue *dev_queue)
{
        return dev_queue->state & QUEUE_STATE_ANY_XOFF;
}

static inline int netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
{
        return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
}

static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
                                        unsigned int bytes)
{
#ifdef CONFIG_BQL
        dql_queued(&dev_queue->dql, bytes);
        if (unlikely(dql_avail(&dev_queue->dql) < 0)) {
                set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
                if (unlikely(dql_avail(&dev_queue->dql) >= 0))
                        clear_bit(__QUEUE_STATE_STACK_XOFF,
                            &dev_queue->state);
        }
#endif
}

static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
{
        netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
}

static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
                                             unsigned pkts, unsigned bytes)
{
#ifdef CONFIG_BQL
        if (likely(bytes)) {
                dql_completed(&dev_queue->dql, bytes);
                if (unlikely(test_bit(__QUEUE_STATE_STACK_XOFF,
                    &dev_queue->state) &&
                    dql_avail(&dev_queue->dql) >= 0)) {
                        if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF,
                             &dev_queue->state))
                                netif_schedule_queue(dev_queue);
                }
        }
#endif
}

static inline void netdev_completed_queue(struct net_device *dev,
                                          unsigned pkts, unsigned 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
        dql_reset(&q->dql);
#endif
}

static inline void netdev_reset_queue(struct net_device *dev_queue)
{
        netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
}

/**
 *      netif_running - test if up
 *      @dev: network device
 *
 *      Test if the device has been brought up.
 */
static inline int 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);
#ifdef CONFIG_NETPOLL_TRAP
        if (netpoll_trap())
                return;
#endif
        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 int __netif_subqueue_stopped(const struct net_device *dev,
                                         u16 queue_index)
{
        struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);

        return netif_tx_queue_stopped(txq);
}

static inline int 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);
#ifdef CONFIG_NETPOLL_TRAP
        if (netpoll_trap())
                return;
#endif
        if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
                __netif_schedule(txq->qdisc);
}

/*
 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
 * as a distribution range limit for the returned value.
 */
static inline u16 skb_tx_hash(const struct net_device *dev,
                              const struct sk_buff *skb)
{
        return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

/**
 *      netif_is_multiqueue - test if device has multiple transmit queues
 *      @dev: network device
 *
 * Check if device has multiple transmit queues
 */
static inline int netif_is_multiqueue(const struct net_device *dev)
{
        return dev->num_tx_queues > 1;
}

extern int netif_set_real_num_tx_queues(struct net_device *dev,
                                        unsigned int txq);

#ifdef CONFIG_RPS
extern int netif_set_real_num_rx_queues(struct net_device *dev,
                                        unsigned int rxq);
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
                                                unsigned int rxq)
{
        return 0;
}
#endif

static inline int netif_copy_real_num_queues(struct net_device *to_dev,
                                             const struct net_device *from_dev)
{
        netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
#ifdef CONFIG_RPS
        return netif_set_real_num_rx_queues(to_dev,
                                            from_dev->real_num_rx_queues);
#else
        return 0;
#endif
}

/* Use this variant when it is known for sure that it
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
 */
extern void dev_kfree_skb_irq(struct sk_buff *skb);

/* Use this variant in places where it could be invoked
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
 */
extern void dev_kfree_skb_any(struct sk_buff *skb);

extern int              netif_rx(struct sk_buff *skb);
extern int              netif_rx_ni(struct sk_buff *skb);
extern int              netif_receive_skb(struct sk_buff *skb);
extern gro_result_t     dev_gro_receive(struct napi_struct *napi,
                                        struct sk_buff *skb);
extern gro_result_t     napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
extern gro_result_t     napi_gro_receive(struct napi_struct *napi,
                                         struct sk_buff *skb);
extern void             napi_gro_flush(struct napi_struct *napi);
extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
extern gro_result_t     napi_frags_finish(struct napi_struct *napi,
                                          struct sk_buff *skb,
                                          gro_result_t ret);
extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
extern gro_result_t     napi_gro_frags(struct napi_struct *napi);

static inline void napi_free_frags(struct napi_struct *napi)
{
        kfree_skb(napi->skb);
        napi->skb = NULL;
}

extern int netdev_rx_handler_register(struct net_device *dev,
                                      rx_handler_func_t *rx_handler,
                                      void *rx_handler_data);
extern void netdev_rx_handler_unregister(struct net_device *dev);

extern int              dev_valid_name(const char *name);
extern int              dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int              dev_ethtool(struct net *net, struct ifreq *);
extern unsigned         dev_get_flags(const struct net_device *);
extern int              __dev_change_flags(struct net_device *, unsigned int flags);
extern int              dev_change_flags(struct net_device *, unsigned);
extern void             __dev_notify_flags(struct net_device *, unsigned int old_flags);
extern int              dev_change_name(struct net_device *, const char *);
extern int              dev_set_alias(struct net_device *, const char *, size_t);
extern int              dev_change_net_namespace(struct net_device *,
                                                 struct net *, const char *);
extern int              dev_set_mtu(struct net_device *, int);
extern void             dev_set_group(struct net_device *, int);
extern int              dev_set_mac_address(struct net_device *,
                                            struct sockaddr *);
extern int              dev_hard_start_xmit(struct sk_buff *skb,
                                            struct net_device *dev,
                                            struct netdev_queue *txq);
extern int              dev_forward_skb(struct net_device *dev,
                                        struct sk_buff *skb);

extern int              netdev_budget;

/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

/**
 *      dev_put - release reference to device
 *      @dev: network device
 *
 * Release reference to device to allow it to be freed.
 */
static inline void dev_put(struct net_device *dev)
{
        irqsafe_cpu_dec(*dev->pcpu_refcnt);
}

/**
 *      dev_hold - get reference to device
 *      @dev: network device
 *
 * Hold reference to device to keep it from being freed.
 */
static inline void dev_hold(struct net_device *dev)
{
        irqsafe_cpu_inc(*dev->pcpu_refcnt);
}

/* Carrier loss detection, dial on demand. The functions netif_carrier_on
 * and _off may be called from IRQ context, but it is caller
 * who is responsible for serialization of these calls.
 *
 * The name carrier is inappropriate, these functions should really be
 * called netif_lowerlayer_*() because they represent the state of any
 * kind of lower layer not just hardware media.
 */

extern void linkwatch_fire_event(struct net_device *dev);
extern void linkwatch_forget_dev(struct net_device *dev);

/**
 *      netif_carrier_ok - test if carrier present
 *      @dev: network device
 *
 * Check if carrier is present on device
 */
static inline int netif_carrier_ok(const struct net_device *dev)
{
        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

extern unsigned long dev_trans_start(struct net_device *dev);

extern void __netdev_watchdog_up(struct net_device *dev);

extern void netif_carrier_on(struct net_device *dev);

extern void netif_carrier_off(struct net_device *dev);

extern void netif_notify_peers(struct net_device *dev);

/**
 *      netif_dormant_on - mark device as dormant.
 *      @dev: network device
 *
 * Mark device as dormant (as per RFC2863).
 *
 * The dormant state indicates that the relevant interface is not
 * actually in a condition to pass packets (i.e., it is not 'up') but is
 * in a "pending" state, waiting for some external event.  For "on-
 * demand" interfaces, this new state identifies the situation where the
 * interface is waiting for events to place it in the up state.
 *
 */
static inline void netif_dormant_on(struct net_device *dev)
{
        if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
                linkwatch_fire_event(dev);
}

/**
 *      netif_dormant_off - set device as not dormant.
 *      @dev: network device
 *
 * Device is not in dormant state.
 */
static inline void netif_dormant_off(struct net_device *dev)
{
        if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
                linkwatch_fire_event(dev);
}

/**
 *      netif_dormant - test if carrier present
 *      @dev: network device
 *
 * Check if carrier is present on device
 */
static inline int netif_dormant(const struct net_device *dev)
{
        return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


/**
 *      netif_oper_up - test if device is operational
 *      @dev: network device
 *
 * Check if carrier is operational
 */
static inline int 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 int netif_device_present(struct net_device *dev)
{
        return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

extern void netif_device_detach(struct net_device *dev);

extern void netif_device_attach(struct net_device *dev);

/*
 * Network interface message level settings
 */

enum {
        NETIF_MSG_DRV           = 0x0001,
        NETIF_MSG_PROBE         = 0x0002,
        NETIF_MSG_LINK          = 0x0004,
        NETIF_MSG_TIMER         = 0x0008,
        NETIF_MSG_IFDOWN        = 0x0010,
        NETIF_MSG_IFUP          = 0x0020,
        NETIF_MSG_RX_ERR        = 0x0040,
        NETIF_MSG_TX_ERR        = 0x0080,
        NETIF_MSG_TX_QUEUED     = 0x0100,
        NETIF_MSG_INTR          = 0x0200,
        NETIF_MSG_TX_DONE       = 0x0400,
        NETIF_MSG_RX_STATUS     = 0x0800,
        NETIF_MSG_PKTDATA       = 0x1000,
        NETIF_MSG_HW            = 0x2000,
        NETIF_MSG_WOL           = 0x4000,
};

#define netif_msg_drv(p)        ((p)->msg_enable & NETIF_MSG_DRV)
#define netif_msg_probe(p)      ((p)->msg_enable & NETIF_MSG_PROBE)
#define netif_msg_link(p)       ((p)->msg_enable & NETIF_MSG_LINK)
#define netif_msg_timer(p)      ((p)->msg_enable & NETIF_MSG_TIMER)
#define netif_msg_ifdown(p)     ((p)->msg_enable & NETIF_MSG_IFDOWN)
#define netif_msg_ifup(p)       ((p)->msg_enable & NETIF_MSG_IFUP)
#define netif_msg_rx_err(p)     ((p)->msg_enable & NETIF_MSG_RX_ERR)
#define netif_msg_tx_err(p)     ((p)->msg_enable & NETIF_MSG_TX_ERR)
#define netif_msg_tx_queued(p)  ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
#define netif_msg_intr(p)       ((p)->msg_enable & NETIF_MSG_INTR)
#define netif_msg_tx_done(p)    ((p)->msg_enable & NETIF_MSG_TX_DONE)
#define netif_msg_rx_status(p)  ((p)->msg_enable & NETIF_MSG_RX_STATUS)
#define netif_msg_pktdata(p)    ((p)->msg_enable & NETIF_MSG_PKTDATA)
#define netif_msg_hw(p)         ((p)->msg_enable & NETIF_MSG_HW)
#define netif_msg_wol(p)        ((p)->msg_enable & NETIF_MSG_WOL)

static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
{
        /* use default */
        if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
                return default_msg_enable_bits;
        if (debug_value == 0)   /* no output */
                return 0;
        /* set low N bits */
        return (1 << debug_value) - 1;
}

static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
{
        spin_lock(&txq->_xmit_lock);
        txq->xmit_lock_owner = cpu;
}

static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
        spin_lock_bh(&txq->_xmit_lock);
        txq->xmit_lock_owner = smp_processor_id();
}

static inline int __netif_tx_trylock(struct netdev_queue *txq)
{
        int ok = spin_trylock(&txq->_xmit_lock);
        if (likely(ok))
                txq->xmit_lock_owner = smp_processor_id();
        return ok;
}

static inline void __netif_tx_unlock(struct netdev_queue *txq)
{
        txq->xmit_lock_owner = -1;
        spin_unlock(&txq->_xmit_lock);
}

static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
{
        txq->xmit_lock_owner = -1;
        spin_unlock_bh(&txq->_xmit_lock);
}

static inline void txq_trans_update(struct netdev_queue *txq)
{
        if (txq->xmit_lock_owner != -1)
                txq->trans_start = jiffies;
}

/**
 *      netif_tx_lock - grab network device transmit lock
 *      @dev: network device
 *
 * Get network device transmit lock
 */
static inline void netif_tx_lock(struct net_device *dev)
{
        unsigned int i;
        int cpu;

        spin_lock(&dev->tx_global_lock);
        cpu = smp_processor_id();
        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);

                /* We are the only thread of execution doing a
                 * freeze, but we have to grab the _xmit_lock in
                 * order to synchronize with threads which are in
                 * the ->hard_start_xmit() handler and already
                 * checked the frozen bit.
                 */
                __netif_tx_lock(txq, cpu);
                set_bit(__QUEUE_STATE_FROZEN, &txq->state);
                __netif_tx_unlock(txq);
        }
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
        local_bh_disable();
        netif_tx_lock(dev);
}

static inline void netif_tx_unlock(struct net_device *dev)
{
        unsigned int i;

        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);

                /* No need to grab the _xmit_lock here.  If the
                 * queue is not stopped for another reason, we
                 * force a schedule.
                 */
                clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
                netif_schedule_queue(txq);
        }
        spin_unlock(&dev->tx_global_lock);
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
        netif_tx_unlock(dev);
        local_bh_enable();
}

#define HARD_TX_LOCK(dev, txq, cpu) {                   \
        if ((dev->features & NETIF_F_LLTX) == 0) {      \
                __netif_tx_lock(txq, cpu);              \
        }                                               \
}

#define HARD_TX_UNLOCK(dev, txq) {                      \
        if ((dev->features & NETIF_F_LLTX) == 0) {      \
                __netif_tx_unlock(txq);                 \
        }                                               \
}

static inline void netif_tx_disable(struct net_device *dev)
{
        unsigned int i;
        int cpu;

        local_bh_disable();
        cpu = smp_processor_id();
        for (i = 0; i < dev->num_tx_queues; i++) {
                struct netdev_queue *txq = netdev_get_tx_queue(dev, i);

                __netif_tx_lock(txq, cpu);
                netif_tx_stop_queue(txq);
                __netif_tx_unlock(txq);
        }
        local_bh_enable();
}

static inline void netif_addr_lock(struct net_device *dev)
{
        spin_lock(&dev->addr_list_lock);
}

static inline void netif_addr_lock_bh(struct net_device *dev)
{
        spin_lock_bh(&dev->addr_list_lock);
}

static inline void netif_addr_unlock(struct net_device *dev)
{
        spin_unlock(&dev->addr_list_lock);
}

static inline void netif_addr_unlock_bh(struct net_device *dev)
{
        spin_unlock_bh(&dev->addr_list_lock);
}

/*
 * dev_addrs walker. Should be used only for read access. Call with
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
                list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)

/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void             ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
                                       void (*setup)(struct net_device *),
                                       unsigned int txqs, unsigned int rxqs);
#define alloc_netdev(sizeof_priv, name, setup) \
        alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)

#define alloc_netdev_mq(sizeof_priv, name, setup, count) \
        alloc_netdev_mqs(sizeof_priv, name, setup, count, count)

extern int              register_netdev(struct net_device *dev);
extern void             unregister_netdev(struct net_device *dev);

/* General hardware address lists handling functions */
extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
                                  struct netdev_hw_addr_list *from_list,
                                  int addr_len, unsigned char addr_type);
extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
                                   struct netdev_hw_addr_list *from_list,
                                   int addr_len, unsigned char addr_type);
extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
                          struct netdev_hw_addr_list *from_list,
                          int addr_len);
extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
                             struct netdev_hw_addr_list *from_list,
                             int addr_len);
extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
extern void __hw_addr_init(struct netdev_hw_addr_list *list);

/* Functions used for device addresses handling */
extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
                        unsigned char addr_type);
extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
                        unsigned char addr_type);
extern int dev_addr_add_multiple(struct net_device *to_dev,
                                 struct net_device *from_dev,
                                 unsigned char addr_type);
extern int dev_addr_del_multiple(struct net_device *to_dev,
                                 struct net_device *from_dev,
                                 unsigned char addr_type);
extern void dev_addr_flush(struct net_device *dev);
extern int dev_addr_init(struct net_device *dev);

/* Functions used for unicast addresses handling */
extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
extern void dev_uc_flush(struct net_device *dev);
extern void dev_uc_init(struct net_device *dev);

/* Functions used for multicast addresses handling */
extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);

/* Functions used for secondary unicast and multicast support */
extern void             dev_set_rx_mode(struct net_device *dev);
extern void             __dev_set_rx_mode(struct net_device *dev);
extern int              dev_set_promiscuity(struct net_device *dev, int inc);
extern int              dev_set_allmulti(struct net_device *dev, int inc);
extern void             netdev_state_change(struct net_device *dev);
extern int              netdev_bonding_change(struct net_device *dev,
                                              unsigned long event);
extern void             netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
extern void             dev_load(struct net *net, const char *name);
extern void             dev_mcast_init(void);
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
                                               struct rtnl_link_stats64 *storage);

extern int              netdev_max_backlog;
extern int              netdev_tstamp_prequeue;
extern int              weight_p;
extern int              bpf_jit_enable;
extern int              netdev_set_master(struct net_device *dev, struct net_device *master);
extern int netdev_set_bond_master(struct net_device *dev,
                                  struct net_device *master);
extern int skb_checksum_help(struct sk_buff *skb);
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
        netdev_features_t features);
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
/* rx skb timestamps */
extern void             net_enable_timestamp(void);
extern void             net_disable_timestamp(void);

#ifdef CONFIG_PROC_FS
extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
extern void dev_seq_stop(struct seq_file *seq, void *v);
#endif

extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

extern struct kobj_ns_type_operations net_ns_type_operations;

extern const char *netdev_drivername(const struct net_device *dev);

extern void linkwatch_run_queue(void);

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);
int __netdev_update_features(struct net_device *dev);
void netdev_update_features(struct net_device *dev);
void netdev_change_features(struct net_device *dev);

void netif_stacked_transfer_operstate(const struct net_device *rootdev,
                                        struct net_device *dev);

netdev_features_t netif_skb_features(struct sk_buff *skb);

static inline int net_gso_ok(netdev_features_t features, int gso_type)
{
        netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;

        /* check flags correspondence */
        BUILD_BUG_ON(SKB_GSO_TCPV4   != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
        BUILD_BUG_ON(SKB_GSO_UDP     != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
        BUILD_BUG_ON(SKB_GSO_DODGY   != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
        BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
        BUILD_BUG_ON(SKB_GSO_TCPV6   != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
        BUILD_BUG_ON(SKB_GSO_FCOE    != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));

        return (features & feature) == feature;
}

static inline int 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 int 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));
}

static inline void netif_set_gso_max_size(struct net_device *dev,
                                          unsigned int size)
{
        dev->gso_max_size = size;
}

static inline int netif_is_bond_slave(struct net_device *dev)
{
        return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
}

extern struct pernet_operations __net_initdata loopback_net_ops;

/* Logging, debugging and troubleshooting/diagnostic helpers. */

/* netdev_printk helpers, similar to dev_printk */

static inline const char *netdev_name(const struct net_device *dev)
{
        if (dev->reg_state != NETREG_REGISTERED)
                return "(unregistered net_device)";
        return dev->name;
}

extern int __netdev_printk(const char *level, const struct net_device *dev,
                        struct va_format *vaf);

extern __printf(3, 4)
int netdev_printk(const char *level, const struct net_device *dev,
                  const char *format, ...);
extern __printf(2, 3)
int netdev_emerg(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_alert(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_crit(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_err(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_warn(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_notice(const struct net_device *dev, const char *format, ...);
extern __printf(2, 3)
int netdev_info(const struct net_device *dev, const char *format, ...);

#define MODULE_ALIAS_NETDEV(device) \
        MODULE_ALIAS("netdev-" device)

#if defined(DEBUG)
#define netdev_dbg(__dev, format, args...)                      \
        netdev_printk(KERN_DEBUG, __dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netdev_dbg(__dev, format, args...)                      \
do {                                                            \
        dynamic_netdev_dbg(__dev, format, ##args);              \
} while (0)
#else
#define netdev_dbg(__dev, format, args...)                      \
({                                                              \
        if (0)                                                  \
                netdev_printk(KERN_DEBUG, __dev, format, ##args); \
        0;                                                      \
})
#endif

#if defined(VERBOSE_DEBUG)
#define netdev_vdbg     netdev_dbg
#else

#define netdev_vdbg(dev, format, args...)                       \
({                                                              \
        if (0)                                                  \
                netdev_printk(KERN_DEBUG, dev, format, ##args); \
        0;                                                      \
})
#endif

/*
 * netdev_WARN() acts like dev_printk(), but with the key difference
 * of using a WARN/WARN_ON to get the message out, including the
 * file/line information and a backtrace.
 */
#define netdev_WARN(dev, format, args...)                       \
        WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);

/* netif printk helpers, similar to netdev_printk */

#define netif_printk(priv, type, level, dev, fmt, args...)      \
do {                                                            \
        if (netif_msg_##type(priv))                             \
                netdev_printk(level, (dev), fmt, ##args);       \
} while (0)

#define netif_level(level, priv, type, dev, fmt, args...)       \
do {                                                            \
        if (netif_msg_##type(priv))                             \
                netdev_##level(dev, fmt, ##args);               \
} while (0)

#define netif_emerg(priv, type, dev, fmt, args...)              \
        netif_level(emerg, priv, type, dev, fmt, ##args)
#define netif_alert(priv, type, dev, fmt, args...)              \
        netif_level(alert, priv, type, dev, fmt, ##args)
#define netif_crit(priv, type, dev, fmt, args...)               \
        netif_level(crit, priv, type, dev, fmt, ##args)
#define netif_err(priv, type, dev, fmt, args...)                \
        netif_level(err, priv, type, dev, fmt, ##args)
#define netif_warn(priv, type, dev, fmt, args...)               \
        netif_level(warn, priv, type, dev, fmt, ##args)
#define netif_notice(priv, type, dev, fmt, args...)             \
        netif_level(notice, priv, type, dev, fmt, ##args)
#define netif_info(priv, type, dev, fmt, args...)               \
        netif_level(info, priv, type, dev, fmt, ##args)

#if defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)             \
        netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netif_dbg(priv, type, netdev, format, args...)          \
do {                                                            \
        if (netif_msg_##type(priv))                             \
                dynamic_netdev_dbg(netdev, format, ##args);     \
} while (0)
#else
#define netif_dbg(priv, type, dev, format, args...)                     \
({                                                                      \
        if (0)                                                          \
                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
        0;                                                              \
})
#endif

#if defined(VERBOSE_DEBUG)
#define netif_vdbg      netif_dbg
#else
#define netif_vdbg(priv, type, dev, format, args...)            \
({                                                              \
        if (0)                                                  \
                netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
        0;                                                      \
})
#endif

#endif /* __KERNEL__ */

#endif  /* _LINUX_NETDEVICE_H */