netdevice.h 68.3 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>
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#include <linux/if_link.h>
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#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() */

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

/* qdisc ->enqueue() return codes. */
#define NET_XMIT_SUCCESS	0x00
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#define NET_XMIT_DROP		0x01	/* skb dropped			*/
#define NET_XMIT_CN		0x02	/* congestion notification	*/
#define NET_XMIT_POLICED	0x03	/* skb is shot by police	*/
#define NET_XMIT_MASK		0x0f	/* qdisc flags in net/sch_generic.h */
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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. */
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#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 */
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#define NETDEV_TX_MASK		0xf0
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enum netdev_tx {
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	__NETDEV_TX_MIN	 = INT_MIN,	/* make sure enum is signed */
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	NETDEV_TX_OK	 = 0x00,	/* driver took care of packet */
	NETDEV_TX_BUSY	 = 0x10,	/* driver tx path was busy*/
	NETDEV_TX_LOCKED = 0x20,	/* driver tx lock was already taken */
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};
typedef enum netdev_tx netdev_tx_t;

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

	return false;
}

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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) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
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# 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 {
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	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;

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

DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);

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struct dev_addr_list {
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	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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#define netdev_uc_count(dev) ((dev)->uc.count)
#define netdev_uc_empty(dev) ((dev)->uc.count == 0)
#define netdev_for_each_uc_addr(ha, dev) \
	list_for_each_entry(ha, &dev->uc.list, list)

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#define netdev_mc_count(dev) ((dev)->mc_count)
#define netdev_mc_empty(dev) (netdev_mc_count(dev) == 0)

#define netdev_for_each_mc_addr(mclist, dev) \
	for (mclist = dev->mc_list; mclist; mclist = mclist->next)

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struct hh_cache {
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	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.
 */

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enum netdev_state_t {
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	__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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};

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enum {
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	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_result {
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	GRO_MERGED,
	GRO_MERGED_FREE,
	GRO_HELD,
	GRO_NORMAL,
	GRO_DROP,
};
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typedef enum gro_result gro_result_t;
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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 {
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	__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 holds an RPS map which can be of variable length.  The
 * map is an array of CPUs.
 */
struct rps_map {
	unsigned int len;
	struct rcu_head rcu;
	u16 cpus[0];
};
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))

/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
	struct rps_map *rps_map;
	struct kobject kobj;
	struct netdev_rx_queue *first;
	atomic_t count;
} ____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.
 *
587 588 589 590 591 592 593 594 595 596 597 598
 * 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
599
 *	needs to be changed. If this interface is not defined, the
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
 *	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.
 *
620
 * void (*ndo_tx_timeout)(struct net_device *dev);
621 622 623
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
624
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
 *	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);
644 645 646 647 648 649 650
 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
651
 */
652
#define HAVE_NET_DEVICE_OPS
653 654 655 656 657
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);
658
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
659 660 661
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
662 663 664 665 666 667 668 669 670 671 672
	void			(*ndo_change_rx_flags)(struct net_device *dev,
						       int flags);
	void			(*ndo_set_rx_mode)(struct net_device *dev);
	void			(*ndo_set_multicast_list)(struct net_device *dev);
	int			(*ndo_set_mac_address)(struct net_device *dev,
						       void *addr);
	int			(*ndo_validate_addr)(struct net_device *dev);
	int			(*ndo_do_ioctl)(struct net_device *dev,
					        struct ifreq *ifr, int cmd);
	int			(*ndo_set_config)(struct net_device *dev,
					          struct ifmap *map);
673 674 675 676
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
677 678 679 680 681 682 683 684 685 686 687 688 689
	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
	void                    (*ndo_poll_controller)(struct net_device *dev);
#endif
690 691 692 693 694 695 696 697 698
	int			(*ndo_set_vf_mac)(struct net_device *dev,
						  int queue, u8 *mac);
	int			(*ndo_set_vf_vlan)(struct net_device *dev,
						   int queue, u16 vlan, u8 qos);
	int			(*ndo_set_vf_tx_rate)(struct net_device *dev,
						      int vf, int rate);
	int			(*ndo_get_vf_config)(struct net_device *dev,
						     int vf,
						     struct ifla_vf_info *ivf);
699
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
700 701
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
702 703 704 705 706 707
	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);
708 709 710 711
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
712
#endif
713 714
};

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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.
 */

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struct net_device {
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	/*
	 * 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];
733 734
	/* device name hash chain */
	struct hlist_node	name_hlist;
735 736
	/* 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;

757
	struct list_head	dev_list;
758
	struct list_head	napi_list;
759
	struct list_head	unreg_list;
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761 762 763
	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
764
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
765 766
#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
767
#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
768 769 770 771 772 773
#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. */
775 776
#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
777
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
778
#define NETIF_F_GRO		16384	/* Generic receive offload */
779
#define NETIF_F_LRO		32768	/* large receive offload */
780

781
/* the GSO_MASK reserves bits 16 through 23 */
782
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
783
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
784
#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
785
#define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
786

787
	/* Segmentation offload features */
788
#define NETIF_F_GSO_SHIFT	16
789
#define NETIF_F_GSO_MASK	0x00ff0000
790
#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)
792
#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)
795
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
796

797 798 799
	/* List of features with software fallbacks. */
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)

800

801
#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
802 803 804
#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)
805

806 807 808 809 810
	/*
	 * 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 | \
811
				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
812 813
				 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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820
#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;
826
#endif
827 828
	/* Management operations */
	const struct net_device_ops *netdev_ops;
829
	const struct ethtool_ops *ethtool_ops;
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831 832 833
	/* 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	*/

846 847 848 849 850 851 852
	/* 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. */
858
	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 */

862 863
	struct netdev_hw_addr_list	uc;	/* Secondary unicast
						   mac addresses */
864
	int			uc_promisc;
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	spinlock_t		addr_list_lock;
866
	struct dev_addr_list	*mc_list;	/* Multicast mac addresses	*/
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	int			mc_count;	/* Number of installed mcasts	*/
868 869
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
	
874 875 876
#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 */
883 884
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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886 887 888 889 890
/*
 * 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() */
891 892 893 894
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

895 896
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
897 898

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

	struct netdev_rx_queue	*_rx;

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

907
	struct netdev_queue	rx_queue;
908 909

	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
910 911

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
912
	unsigned int		num_tx_queues;
913 914 915 916

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

917 918 919
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
921
	spinlock_t		tx_global_lock;
922 923 924 925
/*
 * One part is mostly used on xmit path (device)
 */
	/* These may be needed for future network-power-down code. */
926 927 928 929 930

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
931 932 933 934 935
	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 */
937 938
	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;

944
	struct list_head	link_watch_list;
945

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	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
948
	       NETREG_REGISTERED,	/* completed register_netdevice */
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	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
952
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
953 954 955 956 957 958
	} reg_state:16;

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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960 961
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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#ifdef CONFIG_NETPOLL
964
	struct netpoll_info	*npinfo;
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#endif
966

967
#ifdef CONFIG_NET_NS
968 969
	/* Network namespace this network device is inside */
	struct net		*nd_net;
970
#endif
971

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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;
979 980
	/* GARP */
	struct garp_port	*garp_port;
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	/* class/net/name entry */
983
	struct device		dev;
984 985
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
989

990 991 992
	/* VLAN feature mask */
	unsigned long vlan_features;

993 994 995
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
996

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#ifdef CONFIG_DCB
998
	/* Data Center Bridging netlink ops */
999
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1000 1001
#endif

1002 1003 1004 1005
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
1006 1007
	/* n-tuple filter list attached to this device */
	struct ethtool_rx_ntuple_list ethtool_ntuple_list;
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};
1009
#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32

1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
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);
}

1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
/*
 * 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
1046
void dev_net_set(struct net_device *dev, struct net *net)
1047 1048
{
#ifdef CONFIG_NET_NS
1049 1050
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1051 1052 1053
#endif
}

1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
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;
}

1064 1065 1066 1067 1068 1069 1070 1071 1072
#ifndef CONFIG_NET_NS
static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
{
	skb->dev = dev;
}
#else /* CONFIG_NET_NS */
void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
#endif

1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
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;
}

1083 1084 1085 1086 1087 1088
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1089
static inline void *netdev_priv(const struct net_device *dev)
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{
1091
	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.
 */
1097
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1099 1100 1101 1102 1103 1104
/* 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))

1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
/**
 *	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.
 */
1115 1116
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1117

1118 1119 1120 1121 1122 1123
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1124 1125 1126
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1127 1128 1129
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1130 1131 1132
	/* Length of frag0. */
	unsigned int frag0_len;

1133 1134 1135
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1136 1137 1138 1139 1140 1141 1142 1143
	/* 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;
1147 1148 1149
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1150

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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 *);
1158 1159
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1160
	int			(*gso_send_check)(struct sk_buff *skb);
1161 1162 1163
	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 */

1173

1174 1175
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1176 1177
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1178 1179
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1180 1181 1182 1183
#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)
1184 1185
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1186
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1187

1188 1189 1190 1191 1192
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1193
	net = dev_net(dev);
1194 1195 1196 1197
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
static inline struct net_device *next_net_device_rcu(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

	net = dev_net(dev);
	lh = rcu_dereference(dev->dev_list.next);
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1208 1209 1210 1211 1212
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);
}
1213

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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);
1216 1217 1218
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);

1223
extern struct net_device	*dev_get_by_flags(struct net *net, unsigned short flags,
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						  unsigned short mask);
1225
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1226
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1227
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);
1231
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);
1234 1235
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1236
extern void		unregister_netdevice_many(struct list_head *head);
1237 1238 1239 1240 1241
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);
1246
extern int		init_dummy_netdev(struct net_device *dev);
1247
extern void		netdev_resync_ops(struct net_device *dev);
1248

1249
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1250 1251
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);
1252
extern struct net_device	*dev_get_by_index_rcu(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
1257 1258
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1259
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275

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;
}

1276 1277
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1278
{
1279 1280
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1281

1282 1283 1284 1285
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1286

1287 1288 1289 1290 1291 1292
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;
1293
}
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1295 1296
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1297
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1298 1299
}

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static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1302 1303
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
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1304 1305
}

1306 1307
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1308 1309
				  const void *daddr, const void *saddr,
				  unsigned len)
1310
{
1311
	if (!dev->header_ops || !dev->header_ops->create)
1312
		return 0;
1313 1314

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1315 1316
}

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1317 1318 1319 1320 1321
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1322
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1323
		return 0;
1324
	return dev->header_ops->parse(skb, haddr);
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1325 1326
}

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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.
 */
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struct softnet_data {
1339
	struct Qdisc		*output_queue;
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	struct list_head	poll_list;
	struct sk_buff		*completion_queue;

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	/* Elements below can be accessed between CPUs for RPS */
1344
#ifdef CONFIG_SMP
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1345
	struct call_single_data	csd ____cacheline_aligned_in_smp;
1346
#endif
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	struct sk_buff_head	input_pkt_queue;
1348
	struct napi_struct	backlog;
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1349 1350
};

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DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
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1352 1353 1354

#define HAVE_NETIF_QUEUE

1355
extern void __netif_schedule(struct Qdisc *q);
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1357
static inline void netif_schedule_queue(struct netdev_queue *txq)
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1358
{
1359
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1360
		__netif_schedule(txq->qdisc);
1361 1362
}

1363 1364 1365 1366 1367 1368 1369 1370
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));
}

1371 1372 1373 1374 1375
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1376 1377 1378 1379 1380 1381
/**
 *	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)
{
1384
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
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1385 1386
}

1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
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);
	}
}

1397
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
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1398 1399
{
#ifdef CONFIG_NETPOLL_TRAP
1400
	if (netpoll_trap()) {
1401
		netif_tx_start_queue(dev_queue);
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1402
		return;
1403
	}
L
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1404
#endif
1405
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1406
		__netif_schedule(dev_queue->qdisc);
1407 1408
}

1409 1410 1411 1412 1413 1414 1415
/**
 *	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.
 */
1416 1417
static inline void netif_wake_queue(struct net_device *dev)
{
1418
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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1419 1420
}

1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
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);
	}
}

1431 1432 1433 1434 1435
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1436 1437 1438 1439 1440 1441 1442
/**
 *	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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1443 1444
static inline void netif_stop_queue(struct net_device *dev)
{
1445
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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1446 1447
}

1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
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);
	}
}

1458 1459 1460 1461 1462
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1463 1464 1465 1466 1467 1468
/**
 *	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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1469 1470
static inline int netif_queue_stopped(const struct net_device *dev)
{
1471
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
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1472 1473
}

1474 1475 1476 1477 1478
static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
}

1479 1480 1481 1482 1483 1484
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
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1485 1486 1487 1488 1489
static inline int netif_running(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

1490 1491 1492 1493 1494 1495
/*
 * 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.
 */
1496 1497 1498 1499 1500 1501 1502 1503

/**
 *	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.
 */
1504 1505
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1506
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1507 1508

	netif_tx_start_queue(txq);
1509 1510
}

1511 1512 1513 1514 1515 1516 1517
/**
 *	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.
 */
1518 1519
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1520
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1521 1522 1523 1524
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1525
	netif_tx_stop_queue(txq);
1526 1527
}

1528 1529 1530 1531 1532 1533 1534
/**
 *	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.
 */
1535
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1536 1537
					 u16 queue_index)
{
1538
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1539 1540

	return netif_tx_queue_stopped(txq);
1541 1542
}

1543 1544 1545 1546 1547
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));
}
1548 1549 1550 1551 1552 1553 1554 1555

/**
 *	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.
 */
1556 1557
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1558
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1559 1560 1561 1562
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1563
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1564
		__netif_schedule(txq->qdisc);
1565 1566
}

1567 1568 1569 1570 1571 1572
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1573 1574
static inline int netif_is_multiqueue(const struct net_device *dev)
{
1575
	return (dev->num_tx_queues > 1);
1576
}
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1577 1578

/* Use this variant when it is known for sure that it
1579 1580
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
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1581
 */
1582
extern void dev_kfree_skb_irq(struct sk_buff *skb);
L
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1583 1584

/* Use this variant in places where it could be invoked
1585 1586
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
L
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1587
 */
1588
extern void dev_kfree_skb_any(struct sk_buff *skb);
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1589 1590 1591 1592 1593 1594

#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);
1595
extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
1596
					struct sk_buff *skb);
1597 1598
extern gro_result_t	napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
extern gro_result_t	napi_gro_receive(struct napi_struct *napi,
1599
					 struct sk_buff *skb);
1600 1601
extern void		napi_reuse_skb(struct napi_struct *napi,
				       struct sk_buff *skb);
1602
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
1603
extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
1604 1605
					  struct sk_buff *skb,
					  gro_result_t ret);
1606
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
1607
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
1608 1609 1610 1611 1612 1613 1614

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

1615
extern void		netif_nit_deliver(struct sk_buff *skb);
1616
extern int		dev_valid_name(const char *name);
1617 1618
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
L
Linus Torvalds 已提交
1619
extern unsigned		dev_get_flags(const struct net_device *);
1620
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
L
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1621
extern int		dev_change_flags(struct net_device *, unsigned);
1622
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
1623
extern int		dev_change_name(struct net_device *, const char *);
1624
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1625 1626
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
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1627 1628 1629
extern int		dev_set_mtu(struct net_device *, int);
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
1630
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1631 1632
					    struct net_device *dev,
					    struct netdev_queue *txq);
1633 1634
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
L
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1635

1636
extern int		netdev_budget;
L
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1637 1638 1639 1640

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

1641 1642 1643 1644
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1645
 * Release reference to device to allow it to be freed.
1646
 */
L
Linus Torvalds 已提交
1647 1648 1649 1650 1651
static inline void dev_put(struct net_device *dev)
{
	atomic_dec(&dev->refcnt);
}

1652 1653 1654 1655
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1656
 * Hold reference to device to keep it from being freed.
1657
 */
1658 1659 1660 1661
static inline void dev_hold(struct net_device *dev)
{
	atomic_inc(&dev->refcnt);
}
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1662 1663 1664 1665

/* 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.
S
Stefan Rompf 已提交
1666 1667 1668 1669
 *
 * 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.
L
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1670 1671 1672
 */

extern void linkwatch_fire_event(struct net_device *dev);
1673
extern void linkwatch_forget_dev(struct net_device *dev);
L
Linus Torvalds 已提交
1674

1675 1676 1677 1678 1679 1680
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
L
Linus Torvalds 已提交
1681 1682 1683 1684 1685
static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

1686 1687
extern unsigned long dev_trans_start(struct net_device *dev);

L
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1688 1689
extern void __netdev_watchdog_up(struct net_device *dev);

1690
extern void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
1691

1692
extern void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
1693

1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
/**
 *	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.
 *
 */
S
Stefan Rompf 已提交
1707 1708 1709 1710 1711 1712
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1713 1714 1715 1716 1717 1718
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
1719 1720 1721 1722 1723 1724
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1725 1726 1727 1728 1729 1730
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
S
Stefan Rompf 已提交
1731 1732 1733 1734 1735 1736
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


1737 1738 1739 1740 1741 1742
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
E
Eric Dumazet 已提交
1743 1744
static inline int netif_oper_up(const struct net_device *dev)
{
S
Stefan Rompf 已提交
1745 1746 1747 1748
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

1749 1750 1751 1752 1753 1754
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
L
Linus Torvalds 已提交
1755 1756 1757 1758 1759
static inline int netif_device_present(struct net_device *dev)
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

1760
extern void netif_device_detach(struct net_device *dev);
L
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1761

1762
extern void netif_device_attach(struct net_device *dev);
L
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1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813

/*
 * 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;
}

1814
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
1815
{
1816 1817
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
1818 1819
}

1820 1821 1822 1823 1824 1825
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
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);
}

E
Eric Dumazet 已提交
1846 1847 1848 1849 1850 1851
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

1852 1853 1854 1855 1856 1857
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
1858 1859
static inline void netif_tx_lock(struct net_device *dev)
{
1860
	unsigned int i;
1861
	int cpu;
1862

1863 1864
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
1865 1866
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1867 1868 1869 1870 1871 1872 1873

		/* 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.
		 */
1874
		__netif_tx_lock(txq, cpu);
1875 1876
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
1877
	}
H
Herbert Xu 已提交
1878 1879 1880 1881
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
1882 1883
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
1884 1885 1886 1887
}

static inline void netif_tx_unlock(struct net_device *dev)
{
1888 1889 1890 1891
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1892

1893 1894 1895 1896 1897
		/* 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);
1898
		netif_schedule_queue(txq);
1899 1900
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
1901 1902 1903 1904
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
1905 1906
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
1907 1908
}

1909
#define HARD_TX_LOCK(dev, txq, cpu) {			\
1910
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1911
		__netif_tx_lock(txq, cpu);		\
1912 1913 1914
	}						\
}

1915
#define HARD_TX_UNLOCK(dev, txq) {			\
1916
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
1917
		__netif_tx_unlock(txq);			\
1918 1919 1920
	}						\
}

L
Linus Torvalds 已提交
1921 1922
static inline void netif_tx_disable(struct net_device *dev)
{
1923
	unsigned int i;
1924
	int cpu;
1925

1926 1927
	local_bh_disable();
	cpu = smp_processor_id();
1928 1929
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1930 1931

		__netif_tx_lock(txq, cpu);
1932
		netif_tx_stop_queue(txq);
1933
		__netif_tx_unlock(txq);
1934
	}
1935
	local_bh_enable();
L
Linus Torvalds 已提交
1936 1937
}

1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
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);
}

1958
/*
1959
 * dev_addrs walker. Should be used only for read access. Call with
1960 1961 1962
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
1963
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
1964

L
Linus Torvalds 已提交
1965 1966 1967 1968 1969
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
1970 1971 1972 1973 1974
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)
L
Linus Torvalds 已提交
1975 1976
extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989

/* 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);

1990 1991 1992
/* 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);
J
Jiri Pirko 已提交
1993 1994
extern int		dev_unicast_delete(struct net_device *dev, void *addr);
extern int		dev_unicast_add(struct net_device *dev, void *addr);
1995 1996
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);
1997
extern void		dev_unicast_flush(struct net_device *dev);
L
Linus Torvalds 已提交
1998 1999
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);
2000 2001
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);
2002
extern void		dev_addr_discard(struct net_device *dev);
2003 2004
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);
2005 2006
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);
2007 2008
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
L
Linus Torvalds 已提交
2009
extern void		netdev_state_change(struct net_device *dev);
2010
extern int		netdev_bonding_change(struct net_device *dev,
2011
					      unsigned long event);
2012
extern void		netdev_features_change(struct net_device *dev);
L
Linus Torvalds 已提交
2013
/* Load a device via the kmod */
2014
extern void		dev_load(struct net *net, const char *name);
L
Linus Torvalds 已提交
2015
extern void		dev_mcast_init(void);
2016
extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
2017
extern void		dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
2018

L
Linus Torvalds 已提交
2019 2020 2021
extern int		netdev_max_backlog;
extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
2022
extern int skb_checksum_help(struct sk_buff *skb);
2023
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
2024 2025 2026 2027 2028 2029 2030
#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
L
Linus Torvalds 已提交
2031 2032 2033 2034
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2035 2036 2037 2038 2039 2040
#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

2041 2042 2043
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2044
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
2045

2046 2047
extern void linkwatch_run_queue(void);

2048 2049 2050
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);
2051

2052 2053 2054
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2055
static inline int net_gso_ok(int features, int gso_type)
2056
{
2057
	int feature = gso_type << NETIF_F_GSO_SHIFT;
2058
	return (features & feature) == feature;
2059 2060
}

2061 2062
static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
H
Herbert Xu 已提交
2063
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2064
	       (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
2065 2066
}

2067 2068
static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
2069 2070
	return skb_is_gso(skb) &&
	       (!skb_gso_ok(skb, dev->features) ||
2071
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2072 2073
}

2074 2075 2076 2077 2078 2079
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
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);
	}
}

2090
/* On bonding slaves other than the currently active slave, suppress
2091 2092
 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
 * ARP on active-backup slaves with arp_validate enabled.
2093
 */
2094 2095
static inline int skb_bond_should_drop(struct sk_buff *skb,
				       struct net_device *master)
2096
{
2097
	if (master) {
2098 2099
		struct net_device *dev = skb->dev;

2100 2101 2102
		if (master->priv_flags & IFF_MASTER_ARPMON)
			dev->last_rx = jiffies;

2103 2104 2105 2106 2107 2108 2109 2110
		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);
		}

2111 2112
		if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
			if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2113
			    skb->protocol == __cpu_to_be16(ETH_P_ARP))
2114 2115
				return 0;

2116 2117 2118 2119 2120 2121
			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 &&
2122
			    skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2123 2124 2125 2126
				return 0;

			return 1;
		}
2127 2128 2129 2130
	}
	return 0;
}

2131
extern struct pernet_operations __net_initdata loopback_net_ops;
2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153

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

/* netdev_printk helpers, similar to dev_printk */

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

#define netdev_printk(level, netdev, format, args...)		\
	dev_printk(level, (netdev)->dev.parent,			\
		   "%s: " format,				\
		   netdev_name(netdev), ##args)

#define netdev_emerg(dev, format, args...)			\
	netdev_printk(KERN_EMERG, dev, format, ##args)
#define netdev_alert(dev, format, args...)			\
	netdev_printk(KERN_ALERT, dev, format, ##args)
#define netdev_crit(dev, format, args...)			\
	netdev_printk(KERN_CRIT, dev, format, ##args)
#define netdev_err(dev, format, args...)			\
	netdev_printk(KERN_ERR, dev, format, ##args)
#define netdev_warn(dev, format, args...)			\
	netdev_printk(KERN_WARNING, dev, format, ##args)
#define netdev_notice(dev, format, args...)			\
	netdev_printk(KERN_NOTICE, dev, format, ##args)
#define netdev_info(dev, format, args...)			\
	netdev_printk(KERN_INFO, dev, format, ##args)

#if defined(DEBUG)
#define netdev_dbg(__dev, format, args...)			\
	netdev_printk(KERN_DEBUG, __dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netdev_dbg(__dev, format, args...)			\
do {								\
	dynamic_dev_dbg((__dev)->dev.parent, "%s: " format,	\
			netdev_name(__dev), ##args);		\
} while (0)
#else
#define netdev_dbg(__dev, format, args...)			\
({								\
	if (0)							\
		netdev_printk(KERN_DEBUG, __dev, format, ##args); \
	0;							\
})
#endif

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

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

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

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/* netif printk helpers, similar to netdev_printk */

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

#define netif_emerg(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_EMERG, dev, fmt, ##args)
#define netif_alert(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_ALERT, dev, fmt, ##args)
#define netif_crit(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_CRIT, dev, fmt, ##args)
#define netif_err(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_ERR, dev, fmt, ##args)
#define netif_warn(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_WARNING, dev, fmt, ##args)
#define netif_notice(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_NOTICE, dev, fmt, ##args)
#define netif_info(priv, type, dev, fmt, args...)		\
	netif_printk(priv, type, KERN_INFO, (dev), fmt, ##args)

#if defined(DEBUG)
#define netif_dbg(priv, type, dev, format, args...)		\
	netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
#elif defined(CONFIG_DYNAMIC_DEBUG)
#define netif_dbg(priv, type, netdev, format, args...)		\
do {								\
	if (netif_msg_##type(priv))				\
		dynamic_dev_dbg((netdev)->dev.parent,		\
				"%s: " format,			\
				netdev_name(netdev), ##args);	\
} while (0)
#else
#define netif_dbg(priv, type, dev, format, args...)			\
({									\
	if (0)								\
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
	0;								\
})
#endif

#if defined(VERBOSE_DEBUG)
#define netif_vdbg	netdev_dbg
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
		netif_printk(KERN_DEBUG, dev, format, ##args);	\
	0;							\
})
#endif
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Linus Torvalds 已提交
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#endif /* __KERNEL__ */

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#endif	/* _LINUX_NETDEVICE_H */