netdevice.h 56.4 KB
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/*
 * 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
 *
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 * Authors:	Ross Biro
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 *		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>
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 *		Alan Cox, <alan@lxorguk.ukuu.org.uk>
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 *		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>

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

#include <linux/device.h>
#include <linux/percpu.h>
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#include <linux/dmaengine.h>
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#include <linux/workqueue.h>
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#include <net/net_namespace.h>
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#include <net/dsa.h>
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#ifdef CONFIG_DCBNL
#include <net/dcbnl.h>
#endif
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struct vlan_group;
struct ethtool_ops;
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struct netpoll_info;
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/* 802.11 specific */
struct wireless_dev;
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					/* source back-compat hooks */
#define SET_ETHTOOL_OPS(netdev,ops) \
	( (netdev)->ethtool_ops = (ops) )

#define HAVE_ALLOC_NETDEV		/* feature macro: alloc_xxxdev
					   functions are available. */
#define HAVE_FREE_NETDEV		/* free_netdev() */
#define HAVE_NETDEV_PRIV		/* netdev_priv() */

#define NET_XMIT_SUCCESS	0
#define NET_XMIT_DROP		1	/* skb dropped			*/
#define NET_XMIT_CN		2	/* congestion notification	*/
#define NET_XMIT_POLICED	3	/* skb is shot by police	*/
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#define NET_XMIT_MASK		0xFFFF	/* qdisc flags in net/sch_generic.h */
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/* Backlog congestion levels */
#define NET_RX_SUCCESS		0   /* keep 'em coming, baby */
#define NET_RX_DROP		1  /* packet dropped */
#define NET_RX_CN_LOW		2   /* storm alert, just in case */
#define NET_RX_CN_MOD		3   /* Storm on its way! */
#define NET_RX_CN_HIGH		4   /* The storm is here */
#define NET_RX_BAD		5  /* packet dropped due to kernel error */

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/* 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))
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#define net_xmit_errno(e)	((e) != NET_XMIT_CN ? -ENOBUFS : 0)

#endif

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

/* Driver transmit return codes */
#define NETDEV_TX_OK 0		/* driver took care of packet */
#define NETDEV_TX_BUSY 1	/* driver tx path was busy*/
#define NETDEV_TX_LOCKED -1	/* driver tx lock was already taken */

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#ifdef  __KERNEL__

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/*
 *	Compute the worst case header length according to the protocols
 *	used.
 */
 
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#if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
# if defined(CONFIG_MAC80211_MESH)
#  define LL_MAX_HEADER 128
# else
#  define LL_MAX_HEADER 96
# endif
#elif defined(CONFIG_TR)
# define LL_MAX_HEADER 48
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#else
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# define LL_MAX_HEADER 32
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#endif

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#if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
    !defined(CONFIG_NET_IPGRE) &&  !defined(CONFIG_NET_IPGRE_MODULE) && \
    !defined(CONFIG_IPV6_SIT) && !defined(CONFIG_IPV6_SIT_MODULE) && \
    !defined(CONFIG_IPV6_TUNNEL) && !defined(CONFIG_IPV6_TUNNEL_MODULE)
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#define MAX_HEADER LL_MAX_HEADER
#else
#define MAX_HEADER (LL_MAX_HEADER + 48)
#endif

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#endif  /*  __KERNEL__  */

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/*
 *	Network device statistics. Akin to the 2.0 ether stats but
 *	with byte counters.
 */
 
struct net_device_stats
{
	unsigned long	rx_packets;		/* total packets received	*/
	unsigned long	tx_packets;		/* total packets transmitted	*/
	unsigned long	rx_bytes;		/* total bytes received 	*/
	unsigned long	tx_bytes;		/* total bytes transmitted	*/
	unsigned long	rx_errors;		/* bad packets received		*/
	unsigned long	tx_errors;		/* packet transmit problems	*/
	unsigned long	rx_dropped;		/* no space in linux buffers	*/
	unsigned long	tx_dropped;		/* no space available in linux	*/
	unsigned long	multicast;		/* multicast packets received	*/
	unsigned long	collisions;

	/* detailed rx_errors: */
	unsigned long	rx_length_errors;
	unsigned long	rx_over_errors;		/* receiver ring buff overflow	*/
	unsigned long	rx_crc_errors;		/* recved pkt with crc error	*/
	unsigned long	rx_frame_errors;	/* recv'd frame alignment error */
	unsigned long	rx_fifo_errors;		/* recv'r fifo overrun		*/
	unsigned long	rx_missed_errors;	/* receiver missed packet	*/

	/* detailed tx_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;
	
	/* for cslip etc */
	unsigned long	rx_compressed;
	unsigned long	tx_compressed;
};


/* 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>

struct neighbour;
struct neigh_parms;
struct sk_buff;

struct netif_rx_stats
{
	unsigned total;
	unsigned dropped;
	unsigned time_squeeze;
	unsigned cpu_collision;
};

DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);

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struct dev_addr_list
{
	struct dev_addr_list	*next;
	u8			da_addr[MAX_ADDR_LEN];
	u8			da_addrlen;
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	u8			da_synced;
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	int			da_users;
	int			da_gusers;
};
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/*
 *	We tag multicasts with these structures.
 */
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#define dev_mc_list	dev_addr_list
#define dmi_addr	da_addr
#define dmi_addrlen	da_addrlen
#define dmi_users	da_users
#define dmi_gusers	da_gusers
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struct hh_cache
{
	struct hh_cache *hh_next;	/* Next entry			     */
	atomic_t	hh_refcnt;	/* number of users                   */
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/*
 * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
 * cache line on SMP.
 * They are mostly read, but hh_refcnt may be changed quite frequently,
 * incurring cache line ping pongs.
 */
	__be16		hh_type ____cacheline_aligned_in_smp;
					/* protocol identifier, f.e ETH_P_IP
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                                         *  NOTE:  For VLANs, this will be the
                                         *  encapuslated type. --BLG
                                         */
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	u16		hh_len;		/* length of header */
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	int		(*hh_output)(struct sk_buff *skb);
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	seqlock_t	hh_lock;
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	/* cached hardware header; allow for machine alignment needs.        */
#define HH_DATA_MOD	16
#define HH_DATA_OFF(__len) \
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	(HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
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#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.
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 *
 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
 * may need.
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 */
#define LL_RESERVED_SPACE(dev) \
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	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
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	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
#define LL_ALLOCATED_SPACE(dev) \
	((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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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);
#define HAVE_HEADER_CACHE
	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh);
	void	(*cache_update)(struct hh_cache *hh,
				const struct net_device *dev,
				const unsigned char *haddr);
};

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/* 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,
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	__LINK_STATE_LINKWATCH_PENDING,
	__LINK_STATE_DORMANT,
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};


/*
 * 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

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extern int __init netdev_boot_setup(char *str);
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/*
 * 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;
	struct net_device	*dev;
	struct list_head	dev_list;
#endif
};

enum
{
	NAPI_STATE_SCHED,	/* Poll is scheduled */
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	NAPI_STATE_DISABLE,	/* Disable pending */
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};

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

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/**
 *	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
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 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
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 */
static inline int napi_schedule_prep(struct napi_struct *n)
{
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	return !napi_disable_pending(n) &&
		!test_and_set_bit(NAPI_STATE_SCHED, &n->state);
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}

/**
 *	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);
}

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/* 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;
}

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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
 */
static inline void __napi_complete(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	list_del(&n->poll_list);
	smp_mb__before_clear_bit();
	clear_bit(NAPI_STATE_SCHED, &n->state);
}

static inline void napi_complete(struct napi_struct *n)
{
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	unsigned long flags;

	local_irq_save(flags);
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	__napi_complete(n);
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	local_irq_restore(flags);
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}

/**
 *	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)
{
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	set_bit(NAPI_STATE_DISABLE, &n->state);
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	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
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		msleep(1);
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	clear_bit(NAPI_STATE_DISABLE, &n->state);
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}

/**
 *	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);
}

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#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

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enum netdev_queue_state_t
{
	__QUEUE_STATE_XOFF,
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	__QUEUE_STATE_FROZEN,
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};

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struct netdev_queue {
	struct net_device	*dev;
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	struct Qdisc		*qdisc;
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	unsigned long		state;
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	spinlock_t		_xmit_lock;
	int			xmit_lock_owner;
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	struct Qdisc		*qdisc_sleeping;
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} ____cacheline_aligned_in_smp;
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/*
 * This structure defines the management hooks for network devices.
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 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
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 *
 * 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.
 *
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 * int (*ndo_hard_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, or NETDEV_TX_LOCKED,
 *	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.
 *
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 * 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.
 *
 * void (*ndo_set_multicast_list)(struct net_device *dev);
 *	This function is called when the multicast address list changes.
 *
 * 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 not 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.
 *
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 * void (*ndo_tx_timeout)(struct net_device *dev);
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 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
 * struct net_device_stats* (*get_stats)(struct net_device *dev);
 *	Called when a user wants to get the network device usage
 *	statistics. If not defined, the counters in dev->stats will
 *	be used.
 *
 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
 *	If device support VLAN receive accleration
 *	(ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
 *	when vlan groups for the device changes.  Note: grp is NULL
 *	if no vlan's groups are being used.
 *
 * 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);
 */
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#define HAVE_NET_DEVICE_OPS
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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);
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	int			(*ndo_start_xmit) (struct sk_buff *skb,
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
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#define HAVE_CHANGE_RX_FLAGS
	void			(*ndo_change_rx_flags)(struct net_device *dev,
						       int flags);
#define HAVE_SET_RX_MODE
	void			(*ndo_set_rx_mode)(struct net_device *dev);
#define HAVE_MULTICAST
	void			(*ndo_set_multicast_list)(struct net_device *dev);
#define HAVE_SET_MAC_ADDR
	int			(*ndo_set_mac_address)(struct net_device *dev,
						       void *addr);
#define HAVE_VALIDATE_ADDR
	int			(*ndo_validate_addr)(struct net_device *dev);
#define HAVE_PRIVATE_IOCTL
	int			(*ndo_do_ioctl)(struct net_device *dev,
					        struct ifreq *ifr, int cmd);
#define HAVE_SET_CONFIG
	int			(*ndo_set_config)(struct net_device *dev,
					          struct ifmap *map);
#define HAVE_CHANGE_MTU
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	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
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#define HAVE_TX_TIMEOUT
	void			(*ndo_tx_timeout) (struct net_device *dev);

	struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

	void			(*ndo_vlan_rx_register)(struct net_device *dev,
						        struct vlan_group *grp);
	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
#define HAVE_NETDEV_POLL
	void                    (*ndo_poll_controller)(struct net_device *dev);
#endif
};

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/*
 *	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
	 * the interface.
	 */
	char			name[IFNAMSIZ];
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	/* device name hash chain */
	struct hlist_node	name_hlist;
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	/* snmp alias */
	char 			*ifalias;
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	/*
	 *	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 char		if_port;	/* Selectable AUI, TP,..*/
	unsigned char		dma;		/* DMA channel		*/

	unsigned long		state;

641
	struct list_head	dev_list;
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#ifdef CONFIG_NETPOLL
	struct list_head	napi_list;
#endif
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	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
649
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
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#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
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#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
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#define NETIF_F_HIGHDMA		32	/* Can DMA to high memory. */
#define NETIF_F_FRAGLIST	64	/* Scatter/gather IO. */
#define NETIF_F_HW_VLAN_TX	128	/* Transmit VLAN hw acceleration */
#define NETIF_F_HW_VLAN_RX	256	/* Receive VLAN hw acceleration */
#define NETIF_F_HW_VLAN_FILTER	512	/* Receive filtering on VLAN */
#define NETIF_F_VLAN_CHALLENGED	1024	/* Device cannot handle VLAN packets */
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#define NETIF_F_GSO		2048	/* Enable software GSO. */
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#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
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#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
663
#define NETIF_F_LRO		32768	/* large receive offload */
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	/* Segmentation offload features */
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#define NETIF_F_GSO_SHIFT	16
#define NETIF_F_GSO_MASK	0xffff0000
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#define NETIF_F_TSO		(SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
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#define NETIF_F_UFO		(SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
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#define NETIF_F_GSO_ROBUST	(SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
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#define NETIF_F_TSO_ECN		(SKB_GSO_TCP_ECN << NETIF_F_GSO_SHIFT)
#define NETIF_F_TSO6		(SKB_GSO_TCPV6 << NETIF_F_GSO_SHIFT)
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	/* List of features with software fallbacks. */
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)

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#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
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#define NETIF_F_V4_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IP_CSUM)
#define NETIF_F_V6_CSUM		(NETIF_F_GEN_CSUM | NETIF_F_IPV6_CSUM)
#define NETIF_F_ALL_CSUM	(NETIF_F_V4_CSUM | NETIF_F_V6_CSUM)
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	/*
	 * If one device supports one of these features, then enable them
	 * for all in netdev_increment_features.
	 */
#define NETIF_F_ONE_FOR_ALL	(NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ROBUST | \
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				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
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				 NETIF_F_FRAGLIST)

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

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	struct net_device_stats	stats;
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#ifdef CONFIG_WIRELESS_EXT
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	/* 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;
703
#endif
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	/* Management operations */
	const struct net_device_ops *netdev_ops;
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	const struct ethtool_ops *ethtool_ops;
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	/* Hardware header description */
	const struct header_ops *header_ops;

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

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

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

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	/* 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;

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

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

739
	spinlock_t		addr_list_lock;
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	struct dev_addr_list	*uc_list;	/* Secondary unicast mac addresses */
	int			uc_count;	/* Number of installed ucasts	*/
	int			uc_promisc;
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	struct dev_addr_list	*mc_list;	/* Multicast mac addresses	*/
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	int			mc_count;	/* Number of installed mcasts	*/
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	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
	
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#ifdef CONFIG_NET_DSA
	void			*dsa_ptr;	/* dsa specific data */
#endif
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	void 			*atalk_ptr;	/* AppleTalk link 	*/
	void			*ip_ptr;	/* IPv4 specific data	*/  
	void                    *dn_ptr;        /* DECnet specific data */
	void                    *ip6_ptr;       /* IPv6 specific data */
	void			*ec_ptr;	/* Econet specific data	*/
	void			*ax25_ptr;	/* AX.25 specific data */
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	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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/*
 * Cache line mostly used on receive path (including eth_type_trans())
 */
	unsigned long		last_rx;	/* Time of last Rx	*/
	/* Interface address info used in eth_type_trans() */
	unsigned char		dev_addr[MAX_ADDR_LEN];	/* hw address, (before bcast 
769
							   because most packets are unicast) */
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	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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	struct netdev_queue	rx_queue;
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	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
776 777

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
778
	unsigned int		num_tx_queues;
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	/* Number of TX queues currently active in device  */
	unsigned int		real_num_tx_queues;

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
784
	spinlock_t		tx_global_lock;
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/*
 * One part is mostly used on xmit path (device)
 */
	void			*priv;	/* pointer to private data	*/
	/* These may be needed for future network-power-down code. */
	unsigned long		trans_start;	/* Time (in jiffies) of last Tx	*/

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

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	/* Number of references to this device */
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	atomic_t		refcnt ____cacheline_aligned_in_smp;

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

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	struct net_device	*link_watch_next;

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	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
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	       NETREG_REGISTERED,	/* completed register_netdevice */
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	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
	} reg_state;

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	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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#ifdef CONFIG_NETPOLL
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	struct netpoll_info	*npinfo;
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#endif
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#ifdef CONFIG_NET_NS
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	/* Network namespace this network device is inside */
	struct net		*nd_net;
823
#endif
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	/* mid-layer private */
	void			*ml_priv;

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	/* bridge stuff */
	struct net_bridge_port	*br_port;
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	/* macvlan */
	struct macvlan_port	*macvlan_port;
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	/* GARP */
	struct garp_port	*garp_port;
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	/* class/net/name entry */
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	struct device		dev;
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	/* space for optional statistics and wireless sysfs groups */
	struct attribute_group  *sysfs_groups[3];
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	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
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843 844 845
	/* VLAN feature mask */
	unsigned long vlan_features;

846 847 848
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
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#ifdef CONFIG_DCBNL
	/* Data Center Bridging netlink ops */
	struct dcbnl_rtnl_ops *dcbnl_ops;
#endif

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#ifdef CONFIG_COMPAT_NET_DEV_OPS
	struct {
		int			(*init)(struct net_device *dev);
		void			(*uninit)(struct net_device *dev);
		int			(*open)(struct net_device *dev);
		int			(*stop)(struct net_device *dev);
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		int			(*hard_start_xmit) (struct sk_buff *skb,
							    struct net_device *dev);
		u16			(*select_queue)(struct net_device *dev,
							struct sk_buff *skb);
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		void			(*change_rx_flags)(struct net_device *dev,
							   int flags);
		void			(*set_rx_mode)(struct net_device *dev);
		void			(*set_multicast_list)(struct net_device *dev);
		int			(*set_mac_address)(struct net_device *dev,
							   void *addr);
		int			(*validate_addr)(struct net_device *dev);
		int			(*do_ioctl)(struct net_device *dev,
						    struct ifreq *ifr, int cmd);
		int			(*set_config)(struct net_device *dev,
						      struct ifmap *map);
		int			(*change_mtu)(struct net_device *dev, int new_mtu);
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		int			(*neigh_setup)(struct net_device *dev,
						       struct neigh_parms *);
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		void			(*tx_timeout) (struct net_device *dev);
		struct net_device_stats* (*get_stats)(struct net_device *dev);
		void			(*vlan_rx_register)(struct net_device *dev,
							    struct vlan_group *grp);
		void			(*vlan_rx_add_vid)(struct net_device *dev,
							   unsigned short vid);
		void			(*vlan_rx_kill_vid)(struct net_device *dev,
							    unsigned short vid);
#ifdef CONFIG_NET_POLL_CONTROLLER
		void                    (*poll_controller)(struct net_device *dev);
#endif
	};
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#endif
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};
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#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32
#define	NETDEV_ALIGN_CONST	(NETDEV_ALIGN - 1)

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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);
}

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/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
#ifdef CONFIG_NET_NS
	return dev->nd_net;
#else
	return &init_net;
#endif
}

static inline
931
void dev_net_set(struct net_device *dev, struct net *net)
932 933
{
#ifdef CONFIG_NET_NS
934 935
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
936 937 938
#endif
}

939 940 941 942 943 944 945 946 947 948
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;
}

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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;
}

959 960 961 962 963 964
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
965
static inline void *netdev_priv(const struct net_device *dev)
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{
967 968 969
	return (char *)dev + ((sizeof(struct net_device)
			       + NETDEV_ALIGN_CONST)
			      & ~NETDEV_ALIGN_CONST);
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}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
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#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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/**
 *	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.
 */
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static inline void netif_napi_add(struct net_device *dev,
				  struct napi_struct *napi,
				  int (*poll)(struct napi_struct *, int),
				  int weight)
{
	INIT_LIST_HEAD(&napi->poll_list);
	napi->poll = poll;
	napi->weight = weight;
#ifdef CONFIG_NETPOLL
	napi->dev = dev;
	list_add(&napi->dev_list, &dev->napi_list);
	spin_lock_init(&napi->poll_lock);
	napi->poll_owner = -1;
#endif
	set_bit(NAPI_STATE_SCHED, &napi->state);
}

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/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
static inline void netif_napi_del(struct napi_struct *napi)
{
#ifdef CONFIG_NETPOLL
	list_del(&napi->dev_list);
#endif
}

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struct packet_type {
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	__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 *);
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	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1026
	int			(*gso_send_check)(struct sk_buff *skb);
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	void			*af_packet_priv;
	struct list_head	list;
};

#include <linux/interrupt.h>
#include <linux/notifier.h>

extern rwlock_t				dev_base_lock;		/* Device list lock */

1036

1037 1038 1039 1040 1041 1042 1043
#define for_each_netdev(net, d)		\
		list_for_each_entry(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 net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1044

1045 1046 1047 1048 1049
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1050
	net = dev_net(dev);
1051 1052 1053 1054 1055 1056 1057 1058 1059
	lh = dev->dev_list.next;
	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);
}
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extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1063 1064 1065
extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, 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);
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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);

1070
extern struct net_device	*dev_get_by_flags(struct net *net, unsigned short flags,
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						  unsigned short mask);
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extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
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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);
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extern void		dev_disable_lro(struct net_device *dev);
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extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
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extern void		unregister_netdevice(struct net_device *dev);
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extern void		free_netdev(struct net_device *dev);
extern void		synchronize_net(void);
extern int 		register_netdevice_notifier(struct notifier_block *nb);
extern int		unregister_netdevice_notifier(struct notifier_block *nb);
1085
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
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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);
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extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif

1093 1094
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1095 1096
				  const void *daddr, const void *saddr,
				  unsigned len)
1097
{
1098
	if (!dev->header_ops || !dev->header_ops->create)
1099
		return 0;
1100 1101

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1102 1103
}

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static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1109
	if (!dev->header_ops || !dev->header_ops->parse)
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1110
		return 0;
1111
	return dev->header_ops->parse(skb, haddr);
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1112 1113
}

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1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
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 so that
 * no locking is needed.
 */
struct softnet_data
{
1127
	struct Qdisc		*output_queue;
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	struct sk_buff_head	input_pkt_queue;
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;

1132
	struct napi_struct	backlog;
1133 1134 1135
#ifdef CONFIG_NET_DMA
	struct dma_chan		*net_dma;
#endif
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};

DECLARE_PER_CPU(struct softnet_data,softnet_data);

#define HAVE_NETIF_QUEUE

1142
extern void __netif_schedule(struct Qdisc *q);
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1144
static inline void netif_schedule_queue(struct netdev_queue *txq)
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{
1146
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1147
		__netif_schedule(txq->qdisc);
1148 1149
}

1150 1151 1152 1153 1154 1155 1156 1157
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));
}

1158 1159 1160 1161 1162
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1163 1164 1165 1166 1167 1168
/**
 *	netif_start_queue - allow transmit
 *	@dev: network device
 *
 *	Allow upper layers to call the device hard_start_xmit routine.
 */
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static inline void netif_start_queue(struct net_device *dev)
{
1171
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
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}

1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
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);
	}
}

1184
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
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{
#ifdef CONFIG_NETPOLL_TRAP
1187
	if (netpoll_trap()) {
1188
		clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
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		return;
1190
	}
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#endif
1192
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1193
		__netif_schedule(dev_queue->qdisc);
1194 1195
}

1196 1197 1198 1199 1200 1201 1202
/**
 *	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.
 */
1203 1204
static inline void netif_wake_queue(struct net_device *dev)
{
1205
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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}

1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
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);
	}
}

1218 1219 1220 1221 1222
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1223 1224 1225 1226 1227 1228 1229
/**
 *	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.
 */
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static inline void netif_stop_queue(struct net_device *dev)
{
1232
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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}

1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
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);
	}
}

1245 1246 1247 1248 1249
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1250 1251 1252 1253 1254 1255
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
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static inline int netif_queue_stopped(const struct net_device *dev)
{
1258
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
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}

1261 1262 1263 1264 1265
static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
}

1266 1267 1268 1269 1270 1271
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
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static inline int netif_running(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

1277 1278 1279 1280 1281 1282
/*
 * 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.
 */
1283 1284 1285 1286 1287 1288 1289 1290

/**
 *	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.
 */
1291 1292
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1293 1294
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
	clear_bit(__QUEUE_STATE_XOFF, &txq->state);
1295 1296
}

1297 1298 1299 1300 1301 1302 1303
/**
 *	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.
 */
1304 1305
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1306
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1307 1308 1309 1310
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1311
	set_bit(__QUEUE_STATE_XOFF, &txq->state);
1312 1313
}

1314 1315 1316 1317 1318 1319 1320
/**
 *	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.
 */
1321
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1322 1323
					 u16 queue_index)
{
1324 1325
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
	return test_bit(__QUEUE_STATE_XOFF, &txq->state);
1326 1327
}

1328 1329 1330 1331 1332
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));
}
1333 1334 1335 1336 1337 1338 1339 1340

/**
 *	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.
 */
1341 1342
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1343
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1344 1345 1346 1347
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1348
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1349
		__netif_schedule(txq->qdisc);
1350 1351
}

1352 1353 1354 1355 1356 1357
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1358 1359
static inline int netif_is_multiqueue(const struct net_device *dev)
{
1360
	return (dev->num_tx_queues > 1);
1361
}
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/* Use this variant when it is known for sure that it
1364 1365
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
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 */
1367
extern void dev_kfree_skb_irq(struct sk_buff *skb);
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1368 1369

/* Use this variant in places where it could be invoked
1370 1371
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
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 */
1373
extern void dev_kfree_skb_any(struct sk_buff *skb);
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#define HAVE_NETIF_RX 1
extern int		netif_rx(struct sk_buff *skb);
extern int		netif_rx_ni(struct sk_buff *skb);
#define HAVE_NETIF_RECEIVE_SKB 1
extern int		netif_receive_skb(struct sk_buff *skb);
1380
extern void		netif_nit_deliver(struct sk_buff *skb);
1381
extern int		dev_valid_name(const char *name);
1382 1383
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
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extern unsigned		dev_get_flags(const struct net_device *);
extern int		dev_change_flags(struct net_device *, unsigned);
1386
extern int		dev_change_name(struct net_device *, const char *);
1387
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1388 1389
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
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extern int		dev_set_mtu(struct net_device *, int);
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
1393
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1394 1395
					    struct net_device *dev,
					    struct netdev_queue *txq);
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1397
extern int		netdev_budget;
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/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

1402 1403 1404 1405
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1406
 * Release reference to device to allow it to be freed.
1407
 */
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static inline void dev_put(struct net_device *dev)
{
	atomic_dec(&dev->refcnt);
}

1413 1414 1415 1416
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1417
 * Hold reference to device to keep it from being freed.
1418
 */
1419 1420 1421 1422
static inline void dev_hold(struct net_device *dev)
{
	atomic_inc(&dev->refcnt);
}
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/* 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.
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 *
 * 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.
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 */

extern void linkwatch_fire_event(struct net_device *dev);

1435 1436 1437 1438 1439 1440
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

extern void __netdev_watchdog_up(struct net_device *dev);

1448
extern void netif_carrier_on(struct net_device *dev);
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1450
extern void netif_carrier_off(struct net_device *dev);
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1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464
/**
 *	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.
 *
 */
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static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1471 1472 1473 1474 1475 1476
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
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static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1483 1484 1485 1486 1487 1488
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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1489 1490 1491 1492 1493 1494
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


1495 1496 1497 1498 1499 1500
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
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static inline int netif_oper_up(const struct net_device *dev) {
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

1506 1507 1508 1509 1510 1511
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
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static inline int netif_device_present(struct net_device *dev)
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

1517
extern void netif_device_detach(struct net_device *dev);
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1519
extern void netif_device_attach(struct net_device *dev);
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/*
 * Network interface message level settings
 */
#define HAVE_NETIF_MSG 1

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;
}

1571
/* Test if receive needs to be scheduled but only if up */
1572 1573
static inline int netif_rx_schedule_prep(struct net_device *dev,
					 struct napi_struct *napi)
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{
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	return napi_schedule_prep(napi);
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}

/* Add interface to tail of rx poll list. This assumes that _prep has
 * already been called and returned 1.
 */
1581 1582 1583 1584 1585
static inline void __netif_rx_schedule(struct net_device *dev,
				       struct napi_struct *napi)
{
	__napi_schedule(napi);
}
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/* Try to reschedule poll. Called by irq handler. */

1589 1590
static inline void netif_rx_schedule(struct net_device *dev,
				     struct napi_struct *napi)
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{
1592 1593
	if (netif_rx_schedule_prep(dev, napi))
		__netif_rx_schedule(dev, napi);
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1594 1595
}

1596 1597 1598
/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
static inline int netif_rx_reschedule(struct net_device *dev,
				      struct napi_struct *napi)
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{
1600 1601
	if (napi_schedule_prep(napi)) {
		__netif_rx_schedule(dev, napi);
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		return 1;
	}
	return 0;
}

1607 1608 1609
/* same as netif_rx_complete, except that local_irq_save(flags)
 * has already been issued
 */
1610 1611
static inline void __netif_rx_complete(struct net_device *dev,
				       struct napi_struct *napi)
1612
{
1613
	__napi_complete(napi);
1614 1615
}

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/* Remove interface from poll list: it must be in the poll list
 * on current cpu. This primitive is called by dev->poll(), when
 * it completes the work. The device cannot be out of poll list at this
 * moment, it is BUG().
 */
1621 1622
static inline void netif_rx_complete(struct net_device *dev,
				     struct napi_struct *napi)
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{
	unsigned long flags;

	local_irq_save(flags);
1627
	__netif_rx_complete(dev, napi);
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	local_irq_restore(flags);
}

1631
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
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Herbert Xu 已提交
1632
{
1633 1634
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
1635 1636
}

1637 1638 1639 1640 1641 1642
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662
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);
}

1663 1664 1665 1666 1667 1668
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
1669 1670
static inline void netif_tx_lock(struct net_device *dev)
{
1671
	unsigned int i;
1672
	int cpu;
1673

1674 1675
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
1676 1677
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1678 1679 1680 1681 1682 1683 1684

		/* 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.
		 */
1685
		__netif_tx_lock(txq, cpu);
1686 1687
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
1688
	}
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}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
1693 1694
	local_bh_disable();
	netif_tx_lock(dev);
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}

static inline void netif_tx_unlock(struct net_device *dev)
{
1699 1700 1701 1702
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1703

1704 1705 1706 1707 1708 1709 1710 1711 1712
		/* 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);
		if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
			__netif_schedule(txq->qdisc);
	}
	spin_unlock(&dev->tx_global_lock);
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}

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

1721
#define HARD_TX_LOCK(dev, txq, cpu) {			\
1722
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1723
		__netif_tx_lock(txq, cpu);		\
1724 1725 1726
	}						\
}

1727
#define HARD_TX_UNLOCK(dev, txq) {			\
1728
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1729
		__netif_tx_unlock(txq);			\
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	}						\
}

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static inline void netif_tx_disable(struct net_device *dev)
{
1735
	unsigned int i;
1736
	int cpu;
1737

1738 1739
	local_bh_disable();
	cpu = smp_processor_id();
1740 1741
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1742 1743

		__netif_tx_lock(txq, cpu);
1744
		netif_tx_stop_queue(txq);
1745
		__netif_tx_unlock(txq);
1746
	}
1747
	local_bh_enable();
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}

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
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);
}

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

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
1775 1776 1777 1778 1779
extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
				       void (*setup)(struct net_device *),
				       unsigned int queue_count);
#define alloc_netdev(sizeof_priv, name, setup) \
	alloc_netdev_mq(sizeof_priv, name, setup, 1)
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extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
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/* 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_unicast_delete(struct net_device *dev, void *addr, int alen);
extern int		dev_unicast_add(struct net_device *dev, void *addr, int alen);
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extern int		dev_unicast_sync(struct net_device *to, struct net_device *from);
extern void		dev_unicast_unsync(struct net_device *to, struct net_device *from);
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extern int 		dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
extern int		dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
1791 1792
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);
1793 1794
extern int 		__dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
extern int		__dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
1795 1796
extern int		__dev_addr_sync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
extern void		__dev_addr_unsync(struct dev_addr_list **to, int *to_count, struct dev_addr_list **from, int *from_count);
1797 1798
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
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extern void		netdev_state_change(struct net_device *dev);
1800
extern void		netdev_bonding_change(struct net_device *dev);
1801
extern void		netdev_features_change(struct net_device *dev);
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/* Load a device via the kmod */
1803
extern void		dev_load(struct net *net, const char *name);
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extern void		dev_mcast_init(void);
1805 1806
extern const struct net_device_stats *dev_get_stats(struct net_device *dev);

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extern int		netdev_max_backlog;
extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
1810
extern int skb_checksum_help(struct sk_buff *skb);
1811
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1812 1813 1814 1815 1816 1817 1818
#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
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/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

1823 1824 1825 1826 1827 1828
#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

1829 1830 1831
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

1832
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1833

1834 1835
extern void linkwatch_run_queue(void);

1836 1837 1838
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
					unsigned long mask);
unsigned long netdev_fix_features(unsigned long features, const char *name);
1839

1840
static inline int net_gso_ok(int features, int gso_type)
1841
{
1842
	int feature = gso_type << NETIF_F_GSO_SHIFT;
1843
	return (features & feature) == feature;
1844 1845
}

1846 1847
static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
1848
	return net_gso_ok(features, skb_shinfo(skb)->gso_type);
1849 1850
}

1851 1852
static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
1853 1854
	return skb_is_gso(skb) &&
	       (!skb_gso_ok(skb, dev->features) ||
1855
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1856 1857
}

1858 1859 1860 1861 1862 1863
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

1864
/* On bonding slaves other than the currently active slave, suppress
1865 1866
 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
 * ARP on active-backup slaves with arp_validate enabled.
1867 1868 1869 1870 1871 1872
 */
static inline int skb_bond_should_drop(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct net_device *master = dev->master;

1873 1874 1875 1876 1877 1878 1879
	if (master) {
		if (master->priv_flags & IFF_MASTER_ARPMON)
			dev->last_rx = jiffies;

		if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
			if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
			    skb->protocol == __constant_htons(ETH_P_ARP))
1880 1881
				return 0;

1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
			if (master->priv_flags & IFF_MASTER_ALB) {
				if (skb->pkt_type != PACKET_BROADCAST &&
				    skb->pkt_type != PACKET_MULTICAST)
					return 0;
			}
			if (master->priv_flags & IFF_MASTER_8023AD &&
			    skb->protocol == __constant_htons(ETH_P_SLOW))
				return 0;

			return 1;
		}
1893 1894 1895 1896
	}
	return 0;
}

1897
extern struct pernet_operations __net_initdata loopback_net_ops;
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#endif /* __KERNEL__ */

#endif	/* _LINUX_DEV_H */