netdevice.h 59.7 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 <linux/mm.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/rculist.h>
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#include <linux/dmaengine.h>
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#include <linux/workqueue.h>
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#include <linux/ethtool.h>
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#include <net/net_namespace.h>
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#include <net/dsa.h>
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#ifdef CONFIG_DCB
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#include <net/dcbnl.h>
#endif
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struct vlan_group;
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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 */

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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)

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/* Driver transmit return codes */
enum netdev_tx {
	NETDEV_TX_OK = 0,	/* driver took care of packet */
	NETDEV_TX_BUSY,		/* driver tx path was busy*/
	NETDEV_TX_LOCKED = -1,	/* driver tx lock was already taken */
};
typedef enum netdev_tx netdev_tx_t;

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#endif

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

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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
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#elif defined(CONFIG_TR) || defined(CONFIG_TR_MODULE)
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# 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.
 */
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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 netdev_hw_addr {
	struct list_head	list;
	unsigned char		addr[MAX_ADDR_LEN];
	unsigned char		type;
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#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
	int			refcount;
	bool			synced;
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	struct rcu_head		rcu_head;
};

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

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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
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 * are then used in the device probing.
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 */
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;
#endif
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	unsigned int		gro_count;

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

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

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enum {
	GRO_MERGED,
	GRO_MERGED_FREE,
	GRO_HELD,
	GRO_NORMAL,
	GRO_DROP,
};

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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.
 */
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extern void __napi_complete(struct napi_struct *n);
extern void napi_complete(struct napi_struct *n);
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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 {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc		*qdisc;
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	unsigned long		state;
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	struct Qdisc		*qdisc_sleeping;
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/*
 * write mostly part
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
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	/*
	 * please use this field instead of dev->trans_start
	 */
	unsigned long		trans_start;
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	unsigned long		tx_bytes;
	unsigned long		tx_packets;
	unsigned long		tx_dropped;
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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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 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
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 *	Called when a packet needs to be transmitted.
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 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
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 *	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
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 *	needs to be changed. If this interface is not defined, the
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 *	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.
 *
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 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
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 *	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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	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
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						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
#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
629
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
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	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
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	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);
#endif
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};

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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;
662 663
	/* 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;

684
	struct list_head	dev_list;
685
	struct list_head	napi_list;
686
	struct list_head	unreg_list;
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688 689 690
	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
691
#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. */
694
#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 */
704
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
705
#define NETIF_F_GRO		16384	/* Generic receive offload */
706
#define NETIF_F_LRO		32768	/* large receive offload */
707

708
/* the GSO_MASK reserves bits 16 through 23 */
709
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
710
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
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#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
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713
	/* Segmentation offload features */
714
#define NETIF_F_GSO_SHIFT	16
715
#define NETIF_F_GSO_MASK	0x00ff0000
716
#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)
721
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
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723 724 725
	/* 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 | \
737
				 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;
752
#endif
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	/* Management operations */
	const struct net_device_ops *netdev_ops;
755
	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 */

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	struct netdev_hw_addr_list	uc;	/* Secondary unicast
						   mac addresses */
790
	int			uc_promisc;
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	spinlock_t		addr_list_lock;
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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 */
	
800 801 802
#ifdef CONFIG_NET_DSA
	void			*dsa_ptr;	/* dsa specific data */
#endif
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	void 			*atalk_ptr;	/* AppleTalk link 	*/
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	void			*ip_ptr;	/* IPv4 specific data	*/
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	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 */
809 810
	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() */
817 818 819 820
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

821 822
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
823 824

	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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826
	struct netdev_queue	rx_queue;
827 828

	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
829 830

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
831
	unsigned int		num_tx_queues;
832 833 834 835

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

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

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
840
	spinlock_t		tx_global_lock;
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/*
 * One part is mostly used on xmit path (device)
 */
	/* These may be needed for future network-power-down code. */
845 846 847 848 849

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
850 851 852 853 854
	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 */
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	       NETREG_DUMMY,		/* dummy device for NAPI poll */
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	} 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
878
	struct netpoll_info	*npinfo;
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#endif
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881
#ifdef CONFIG_NET_NS
882 883
	/* Network namespace this network device is inside */
	struct net		*nd_net;
884
#endif
885

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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 */
897
	struct device		dev;
898
	/* space for optional statistics and wireless sysfs groups */
899
	const struct attribute_group *sysfs_groups[3];
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	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
903

904 905 906
	/* VLAN feature mask */
	unsigned long vlan_features;

907 908 909
	/* 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_DCB
912
	/* Data Center Bridging netlink ops */
913
	const struct dcbnl_rtnl_ops *dcbnl_ops;
914 915
#endif

916 917 918 919
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
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};
921
#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32

925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943
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);
}

944 945 946 947 948 949 950 951 952 953 954 955 956 957
/*
 * 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
958
void dev_net_set(struct net_device *dev, struct net *net)
959 960
{
#ifdef CONFIG_NET_NS
961 962
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
963 964 965
#endif
}

966 967 968 969 970 971 972 973 974 975
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;
}

976 977 978 979 980 981 982 983 984 985
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;
}

986 987 988 989 990 991
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
992
static inline void *netdev_priv(const struct net_device *dev)
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{
994
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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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.
 */
1000
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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/* 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))

1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
/**
 *	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.
 */
1018 1019
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1020

1021 1022 1023 1024 1025 1026
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1027 1028 1029
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1030 1031 1032
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1033 1034 1035
	/* Length of frag0. */
	unsigned int frag0_len;

1036 1037 1038
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1039 1040 1041 1042 1043 1044 1045 1046
	/* 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;
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	/* Free the skb? */
	int free;
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};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
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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 *);
1061 1062
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1063
	int			(*gso_send_check)(struct sk_buff *skb);
1064 1065 1066
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(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 */

1076

1077 1078 1079 1080 1081 1082 1083
#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)
1084

1085 1086 1087 1088 1089
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1090
	net = dev_net(dev);
1091 1092 1093 1094 1095 1096 1097 1098 1099
	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);
1103 1104 1105
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);

1110
extern struct net_device	*dev_get_by_flags(struct net *net, unsigned short flags,
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						  unsigned short mask);
1112 1113
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);
1117
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);
1120 1121
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1122
extern void		unregister_netdevice_many(struct list_head *head);
1123 1124 1125 1126 1127
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

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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);
1132
extern int		init_dummy_netdev(struct net_device *dev);
1133
extern void		netdev_resync_ops(struct net_device *dev);
1134

1135
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1136 1137
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
1142 1143
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1144
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160

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;
}

1161 1162
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1163
{
1164 1165
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1166

1167 1168 1169 1170
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1171

1172 1173 1174 1175 1176 1177
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
					unsigned int offset)
{
	NAPI_GRO_CB(skb)->frag0 = NULL;
	NAPI_GRO_CB(skb)->frag0_len = 0;
	return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
1178
}
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1180 1181
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1182
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1183 1184
}

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static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1187 1188
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
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}

1191 1192
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1193 1194
				  const void *daddr, const void *saddr,
				  unsigned len)
1195
{
1196
	if (!dev->header_ops || !dev->header_ops->create)
1197
		return 0;
1198 1199

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1200 1201
}

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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;

1207
	if (!dev->header_ops || !dev->header_ops->parse)
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		return 0;
1209
	return dev->header_ops->parse(skb, haddr);
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}

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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
{
1225
	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;

1230
	struct napi_struct	backlog;
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};

DECLARE_PER_CPU(struct softnet_data,softnet_data);

#define HAVE_NETIF_QUEUE

1237
extern void __netif_schedule(struct Qdisc *q);
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1239
static inline void netif_schedule_queue(struct netdev_queue *txq)
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{
1241
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1242
		__netif_schedule(txq->qdisc);
1243 1244
}

1245 1246 1247 1248 1249 1250 1251 1252
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));
}

1253 1254 1255 1256 1257
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1258 1259 1260 1261 1262 1263
/**
 *	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)
{
1266
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
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}

1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
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);
	}
}

1279
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
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{
#ifdef CONFIG_NETPOLL_TRAP
1282
	if (netpoll_trap()) {
1283
		netif_tx_start_queue(dev_queue);
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		return;
1285
	}
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#endif
1287
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1288
		__netif_schedule(dev_queue->qdisc);
1289 1290
}

1291 1292 1293 1294 1295 1296 1297
/**
 *	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.
 */
1298 1299
static inline void netif_wake_queue(struct net_device *dev)
{
1300
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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}

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
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);
	}
}

1313 1314 1315 1316 1317
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1318 1319 1320 1321 1322 1323 1324
/**
 *	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)
{
1327
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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}

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

1340 1341 1342 1343 1344
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1345 1346 1347 1348 1349 1350
/**
 *	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)
{
1353
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
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}

1356 1357 1358 1359 1360
static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
}

1361 1362 1363 1364 1365 1366
/**
 *	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);
}

1372 1373 1374 1375 1376 1377
/*
 * 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.
 */
1378 1379 1380 1381 1382 1383 1384 1385

/**
 *	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.
 */
1386 1387
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1388
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1389 1390

	netif_tx_start_queue(txq);
1391 1392
}

1393 1394 1395 1396 1397 1398 1399
/**
 *	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.
 */
1400 1401
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1402
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1403 1404 1405 1406
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1407
	netif_tx_stop_queue(txq);
1408 1409
}

1410 1411 1412 1413 1414 1415 1416
/**
 *	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.
 */
1417
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1418 1419
					 u16 queue_index)
{
1420
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1421 1422

	return netif_tx_queue_stopped(txq);
1423 1424
}

1425 1426 1427 1428 1429
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));
}
1430 1431 1432 1433 1434 1435 1436 1437

/**
 *	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.
 */
1438 1439
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1440
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1441 1442 1443 1444
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1445
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1446
		__netif_schedule(txq->qdisc);
1447 1448
}

1449 1450 1451 1452 1453 1454
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1455 1456
static inline int netif_is_multiqueue(const struct net_device *dev)
{
1457
	return (dev->num_tx_queues > 1);
1458
}
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/* Use this variant when it is known for sure that it
1461 1462
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
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1463
 */
1464
extern void dev_kfree_skb_irq(struct sk_buff *skb);
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/* Use this variant in places where it could be invoked
1467 1468
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
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 */
1470
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);
1477
extern void		napi_gro_flush(struct napi_struct *napi);
1478 1479
extern int		dev_gro_receive(struct napi_struct *napi,
					struct sk_buff *skb);
1480
extern int		napi_skb_finish(int ret, struct sk_buff *skb);
1481 1482
extern int		napi_gro_receive(struct napi_struct *napi,
					 struct sk_buff *skb);
1483 1484
extern void		napi_reuse_skb(struct napi_struct *napi,
				       struct sk_buff *skb);
1485
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
1486 1487
extern int		napi_frags_finish(struct napi_struct *napi,
					  struct sk_buff *skb, int ret);
1488 1489 1490 1491 1492 1493 1494 1495 1496
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
extern int		napi_gro_frags(struct napi_struct *napi);

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

1497
extern void		netif_nit_deliver(struct sk_buff *skb);
1498
extern int		dev_valid_name(const char *name);
1499 1500
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);
1503
extern int		dev_change_name(struct net_device *, const char *);
1504
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1505 1506
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 *);
1510
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1511 1512
					    struct net_device *dev,
					    struct netdev_queue *txq);
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1514
extern int		netdev_budget;
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/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

1519 1520 1521 1522
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1523
 * Release reference to device to allow it to be freed.
1524
 */
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static inline void dev_put(struct net_device *dev)
{
	atomic_dec(&dev->refcnt);
}

1530 1531 1532 1533
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1534
 * Hold reference to device to keep it from being freed.
1535
 */
1536 1537 1538 1539
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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1544 1545 1546 1547
 *
 * 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);

1552 1553 1554 1555 1556 1557
/**
 *	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);
}

1563 1564
extern unsigned long dev_trans_start(struct net_device *dev);

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1565 1566
extern void __netdev_watchdog_up(struct net_device *dev);

1567
extern void netif_carrier_on(struct net_device *dev);
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1569
extern void netif_carrier_off(struct net_device *dev);
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1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583
/**
 *	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);
}

1590 1591 1592 1593 1594 1595
/**
 *	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);
}

1602 1603 1604 1605 1606 1607
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


1614 1615 1616 1617 1618 1619
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
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1620 1621 1622 1623 1624
static inline int netif_oper_up(const struct net_device *dev) {
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

1625 1626 1627 1628 1629 1630
/**
 *	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);
}

1636
extern void netif_device_detach(struct net_device *dev);
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1638
extern void netif_device_attach(struct net_device *dev);
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1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689

/*
 * 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;
}

1690
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
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{
1692 1693
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
1694 1695
}

1696 1697 1698 1699 1700 1701
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
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);
}

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

1728 1729 1730 1731 1732 1733
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
1734 1735
static inline void netif_tx_lock(struct net_device *dev)
{
1736
	unsigned int i;
1737
	int cpu;
1738

1739 1740
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
1741 1742
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1743 1744 1745 1746 1747 1748 1749

		/* 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.
		 */
1750
		__netif_tx_lock(txq, cpu);
1751 1752
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
1753
	}
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}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
1758 1759
	local_bh_disable();
	netif_tx_lock(dev);
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}

static inline void netif_tx_unlock(struct net_device *dev)
{
1764 1765 1766 1767
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1768

1769 1770 1771 1772 1773
		/* 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);
1774
		netif_schedule_queue(txq);
1775 1776
	}
	spin_unlock(&dev->tx_global_lock);
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}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
1781 1782
	netif_tx_unlock(dev);
	local_bh_enable();
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}

1785
#define HARD_TX_LOCK(dev, txq, cpu) {			\
1786
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1787
		__netif_tx_lock(txq, cpu);		\
1788 1789 1790
	}						\
}

1791
#define HARD_TX_UNLOCK(dev, txq) {			\
1792
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1793
		__netif_tx_unlock(txq);			\
1794 1795 1796
	}						\
}

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static inline void netif_tx_disable(struct net_device *dev)
{
1799
	unsigned int i;
1800
	int cpu;
1801

1802 1803
	local_bh_disable();
	cpu = smp_processor_id();
1804 1805
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1806 1807

		__netif_tx_lock(txq, cpu);
1808
		netif_tx_stop_queue(txq);
1809
		__netif_tx_unlock(txq);
1810
	}
1811
	local_bh_enable();
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}

1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
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);
}

1834
/*
1835
 * dev_addrs walker. Should be used only for read access. Call with
1836 1837 1838
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
1839
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1840

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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 */
1846 1847 1848 1849 1850
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);
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865

/* 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);

1866 1867 1868
/* 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);
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extern int		dev_unicast_delete(struct net_device *dev, void *addr);
extern int		dev_unicast_add(struct net_device *dev, void *addr);
1871 1872
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);
1875 1876
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);
1877 1878
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);
1879 1880
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);
1881 1882
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);
1884 1885
extern void		netdev_bonding_change(struct net_device *dev,
					      unsigned long event);
1886
extern void		netdev_features_change(struct net_device *dev);
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/* Load a device via the kmod */
1888
extern void		dev_load(struct net *net, const char *name);
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1889
extern void		dev_mcast_init(void);
1890 1891
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);
1895
extern int skb_checksum_help(struct sk_buff *skb);
1896
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
1897 1898 1899 1900 1901 1902 1903
#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);

1908 1909 1910 1911 1912 1913
#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

1914 1915 1916
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

1917
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
1918

1919 1920
extern void linkwatch_run_queue(void);

1921 1922 1923
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);
1924

1925
static inline int net_gso_ok(int features, int gso_type)
1926
{
1927
	int feature = gso_type << NETIF_F_GSO_SHIFT;
1928
	return (features & feature) == feature;
1929 1930
}

1931 1932
static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
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	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
1934
	       (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
1935 1936
}

1937 1938
static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
1939 1940
	return skb_is_gso(skb) &&
	       (!skb_gso_ok(skb, dev->features) ||
1941
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
1942 1943
}

1944 1945 1946 1947 1948 1949
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
					      struct net_device *master)
{
	if (skb->pkt_type == PACKET_HOST) {
		u16 *dest = (u16 *) eth_hdr(skb)->h_dest;

		memcpy(dest, master->dev_addr, ETH_ALEN);
	}
}

1960
/* On bonding slaves other than the currently active slave, suppress
1961 1962
 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
 * ARP on active-backup slaves with arp_validate enabled.
1963 1964 1965 1966 1967 1968
 */
static inline int skb_bond_should_drop(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct net_device *master = dev->master;

1969 1970 1971 1972
	if (master) {
		if (master->priv_flags & IFF_MASTER_ARPMON)
			dev->last_rx = jiffies;

1973 1974 1975 1976 1977 1978 1979 1980
		if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
			/* Do address unmangle. The local destination address
			 * will be always the one master has. Provides the right
			 * functionality in a bridge.
			 */
			skb_bond_set_mac_by_master(skb, master);
		}

1981 1982
		if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
			if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
1983
			    skb->protocol == __cpu_to_be16(ETH_P_ARP))
1984 1985
				return 0;

1986 1987 1988 1989 1990 1991
			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 &&
1992
			    skb->protocol == __cpu_to_be16(ETH_P_SLOW))
1993 1994 1995 1996
				return 0;

			return 1;
		}
1997 1998 1999 2000
	}
	return 0;
}

2001
extern struct pernet_operations __net_initdata loopback_net_ops;
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

static inline int dev_ethtool_get_settings(struct net_device *dev,
					   struct ethtool_cmd *cmd)
{
	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
		return -EOPNOTSUPP;
	return dev->ethtool_ops->get_settings(dev, cmd);
}

static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
{
	if (!dev->ethtool_ops || !dev->ethtool_ops->get_rx_csum)
		return 0;
	return dev->ethtool_ops->get_rx_csum(dev);
}

static inline u32 dev_ethtool_get_flags(struct net_device *dev)
{
	if (!dev->ethtool_ops || !dev->ethtool_ops->get_flags)
		return 0;
	return dev->ethtool_ops->get_flags(dev);
}
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2024 2025
#endif /* __KERNEL__ */

2026
#endif	/* _LINUX_NETDEVICE_H */