netdevice.h 71.5 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/pm_qos_params.h>
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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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 *	Old network device statistics. Fields are native words
 *	(unsigned long) so they can be read and written atomically.
 *	Each field is padded to 64 bits for compatibility with
 *	rtnl_link_stats64.
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 */
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#if BITS_PER_LONG == 64
#define NET_DEVICE_STATS_DEFINE(name)	unsigned long name
#elif defined(__LITTLE_ENDIAN)
#define NET_DEVICE_STATS_DEFINE(name)	unsigned long name, pad_ ## name
#else
#define NET_DEVICE_STATS_DEFINE(name)	unsigned long pad_ ## name, name
#endif

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struct net_device_stats {
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	NET_DEVICE_STATS_DEFINE(rx_packets);
	NET_DEVICE_STATS_DEFINE(tx_packets);
	NET_DEVICE_STATS_DEFINE(rx_bytes);
	NET_DEVICE_STATS_DEFINE(tx_bytes);
	NET_DEVICE_STATS_DEFINE(rx_errors);
	NET_DEVICE_STATS_DEFINE(tx_errors);
	NET_DEVICE_STATS_DEFINE(rx_dropped);
	NET_DEVICE_STATS_DEFINE(tx_dropped);
	NET_DEVICE_STATS_DEFINE(multicast);
	NET_DEVICE_STATS_DEFINE(collisions);
	NET_DEVICE_STATS_DEFINE(rx_length_errors);
	NET_DEVICE_STATS_DEFINE(rx_over_errors);
	NET_DEVICE_STATS_DEFINE(rx_crc_errors);
	NET_DEVICE_STATS_DEFINE(rx_frame_errors);
	NET_DEVICE_STATS_DEFINE(rx_fifo_errors);
	NET_DEVICE_STATS_DEFINE(rx_missed_errors);
	NET_DEVICE_STATS_DEFINE(tx_aborted_errors);
	NET_DEVICE_STATS_DEFINE(tx_carrier_errors);
	NET_DEVICE_STATS_DEFINE(tx_fifo_errors);
	NET_DEVICE_STATS_DEFINE(tx_heartbeat_errors);
	NET_DEVICE_STATS_DEFINE(tx_window_errors);
	NET_DEVICE_STATS_DEFINE(rx_compressed);
	NET_DEVICE_STATS_DEFINE(tx_compressed);
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};

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#endif  /*  __KERNEL__  */

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/* 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 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
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#define NETDEV_HW_ADDR_T_MULTICAST	5
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	int			refcount;
	bool			synced;
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	bool			global_use;
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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_hw_addr_list_count(l) ((l)->count)
#define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
#define netdev_hw_addr_list_for_each(ha, l) \
	list_for_each_entry(ha, &(l)->list, list)
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#define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
#define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
#define netdev_for_each_uc_addr(ha, dev) \
	netdev_hw_addr_list_for_each(ha, &(dev)->uc)
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#define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
#define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
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#define netdev_for_each_mc_addr(ha, dev) \
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	netdev_hw_addr_list_for_each(ha, &(dev)->mc)
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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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typedef struct sk_buff *rx_handler_func_t(struct sk_buff *skb);

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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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#ifdef CONFIG_RPS
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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)))

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/*
 * The rps_dev_flow structure contains the mapping of a flow to a CPU and the
 * tail pointer for that CPU's input queue at the time of last enqueue.
 */
struct rps_dev_flow {
	u16 cpu;
	u16 fill;
	unsigned int last_qtail;
};

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

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

#define RPS_NO_CPU 0xffff

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

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

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

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

extern struct rps_sock_flow_table *rps_sock_flow_table;

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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
	struct rps_map *rps_map;
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	struct rps_dev_flow_table *rps_flow_table;
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	struct kobject kobj;
	struct netdev_rx_queue *first;
	atomic_t count;
} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
597 598 599

/*
 * This structure defines the management hooks for network devices.
600 601
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
 *
 * 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.
 *
621 622
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
623
 *	Called when a packet needs to be transmitted.
624 625
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
626 627 628 629 630 631
 *	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
644
 *	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.
 *
665
 * 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.
 *
669
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev);
670
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
671
 *	Called when a user wants to get the network device usage
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 *	statistics. Drivers must do one of the following:
 *	1. Define @ndo_get_stats64 to update a rtnl_link_stats64 structure
 *	   (which should normally be dev->stats64) and return a ponter to
 *	   it. The structure must not be changed asynchronously.
 *	2. Define @ndo_get_stats to update a net_device_stats64 structure
 *	   (which should normally be dev->stats) and return a pointer to
 *	   it. The structure may be changed asynchronously only if each
 *	   field is written atomically.
 *	3. Update dev->stats asynchronously and atomically, and define
 *	   neither operation.
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 *
 * 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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 *
 *	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);
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 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *			  struct nlattr *port[]);
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
708
 */
709
#define HAVE_NET_DEVICE_OPS
710 711 712 713 714
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);
715
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
716 717 718
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
719 720 721 722 723 724 725 726 727 728 729
	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);
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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 *);
734 735
	void			(*ndo_tx_timeout) (struct net_device *dev);

736
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev);
737 738 739 740 741 742 743 744 745 746
	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);
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	int			(*ndo_netpoll_setup)(struct net_device *dev,
						     struct netpoll_info *info);
749
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
750
#endif
751 752 753 754 755 756 757 758 759
	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);
760 761 762 763 764
	int			(*ndo_set_vf_port)(struct net_device *dev,
						   int vf,
						   struct nlattr *port[]);
	int			(*ndo_get_vf_port)(struct net_device *dev,
						   int vf, struct sk_buff *skb);
765
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
766 767
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
768 769 770 771 772 773
	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);
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#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
778
#endif
779 780
};

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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];
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	struct pm_qos_request_list *pm_qos_req;

802 803
	/* device name hash chain */
	struct hlist_node	name_hlist;
804 805
	/* 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;

826
	struct list_head	dev_list;
827
	struct list_head	napi_list;
828
	struct list_head	unreg_list;
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830 831 832
	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
833
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
834 835
#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
836
#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
837 838 839 840 841 842
#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. */
844 845
#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
846
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
847
#define NETIF_F_GRO		16384	/* Generic receive offload */
848
#define NETIF_F_LRO		32768	/* large receive offload */
849

850
/* the GSO_MASK reserves bits 16 through 23 */
851
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
852
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
853
#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
854
#define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
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#define NETIF_F_RXHASH		(1 << 28) /* Receive hashing offload */
856

857
	/* Segmentation offload features */
858
#define NETIF_F_GSO_SHIFT	16
859
#define NETIF_F_GSO_MASK	0x00ff0000
860
#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)
862
#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)
865
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
866

867 868 869
	/* List of features with software fallbacks. */
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | NETIF_F_TSO6)

870

871
#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
872 873 874
#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)
875

876 877 878 879 880
	/*
	 * 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 | \
881
				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
882 883
				 NETIF_F_FRAGLIST)

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

888 889 890 891
	union {
		struct rtnl_link_stats64 stats64;
		struct net_device_stats stats;
	};
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893
#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;
899
#endif
900 901
	/* Management operations */
	const struct net_device_ops *netdev_ops;
902
	const struct ethtool_ops *ethtool_ops;
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904 905 906
	/* 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 */

915
	unsigned int		mtu;	/* interface MTU value		*/
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	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

919 920 921 922 923 924 925
	/* 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. */
931
	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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	spinlock_t		addr_list_lock;
936 937 938
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
	int			uc_promisc;
939 940
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
	
945 946 947
#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 */
954 955
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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957 958 959 960 961
/*
 * 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() */
962 963 964 965
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

966 967
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
968 969

	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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#ifdef CONFIG_RPS
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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;
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#endif
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980
	struct netdev_queue	rx_queue;
981
	rx_handler_func_t	*rx_handler;
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	void			*rx_handler_data;
983 984

	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
985 986

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
987
	unsigned int		num_tx_queues;
988 989 990 991

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

992 993 994
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
996
	spinlock_t		tx_global_lock;
997 998 999 1000
/*
 * One part is mostly used on xmit path (device)
 */
	/* These may be needed for future network-power-down code. */
1001 1002 1003 1004 1005

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1006 1007 1008 1009 1010
	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 */
1012 1013
	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;

1019
	struct list_head	link_watch_list;
1020

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	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1023
	       NETREG_REGISTERED,	/* completed register_netdevice */
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	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1027
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1028 1029 1030 1031 1032 1033
	} reg_state:16;

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1035 1036
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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#ifdef CONFIG_NETPOLL
1039
	struct netpoll_info	*npinfo;
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#endif
1041

1042
#ifdef CONFIG_NET_NS
1043 1044
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1045
#endif
1046

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	/* mid-layer private */
	void			*ml_priv;

1050 1051
	/* GARP */
	struct garp_port	*garp_port;
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	/* class/net/name entry */
1054
	struct device		dev;
1055 1056
	/* 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;
1060

1061 1062 1063
	/* VLAN feature mask */
	unsigned long vlan_features;

1064 1065 1066
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1067

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#ifdef CONFIG_DCB
1069
	/* Data Center Bridging netlink ops */
1070
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1071 1072
#endif

1073 1074 1075 1076
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
1077 1078
	/* n-tuple filter list attached to this device */
	struct ethtool_rx_ntuple_list ethtool_ntuple_list;
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};
1080
#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32

1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
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);
}

1103 1104 1105 1106 1107 1108
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
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	return read_pnet(&dev->nd_net);
1110 1111 1112
}

static inline
1113
void dev_net_set(struct net_device *dev, struct net *net)
1114 1115
{
#ifdef CONFIG_NET_NS
1116 1117
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1118 1119 1120
#endif
}

1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
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;
}

1131 1132 1133 1134 1135 1136 1137 1138 1139
#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

1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
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;
}

1150 1151 1152 1153 1154 1155
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1156
static inline void *netdev_priv(const struct net_device *dev)
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{
1158
	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.
 */
1164
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1166 1167 1168 1169 1170 1171
/* 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))

1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
/**
 *	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.
 */
1182 1183
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1184

1185 1186 1187 1188 1189 1190
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1191 1192 1193
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1194 1195 1196
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1197 1198 1199
	/* Length of frag0. */
	unsigned int frag0_len;

1200 1201 1202
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1203 1204 1205 1206 1207 1208 1209 1210
	/* 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;
1214 1215 1216
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1217

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struct packet_type {
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1219 1220 1221 1222 1223 1224
	__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 *);
1225 1226
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1227
	int			(*gso_send_check)(struct sk_buff *skb);
1228 1229 1230
	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 */

1240

1241 1242
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1243 1244
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1245 1246
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1247 1248 1249 1250
#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)
1251 1252
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1253
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1254

1255 1256 1257 1258 1259
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1260
	net = dev_net(dev);
1261 1262 1263 1264
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
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);
}

1275 1276 1277 1278 1279
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);
}
1280

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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);
1283 1284 1285
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);

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extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1292
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1293
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1294
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);
1298
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);
1301 1302
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1303
extern void		unregister_netdevice_many(struct list_head *head);
1304 1305 1306 1307 1308
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);
1313
extern int		init_dummy_netdev(struct net_device *dev);
1314
extern void		netdev_resync_ops(struct net_device *dev);
1315

1316
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1317 1318
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);
1319
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
1324 1325
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1326
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342

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;
}

1343 1344
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1345
{
1346 1347
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1348

1349 1350 1351 1352
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1353

1354 1355 1356 1357 1358 1359
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;
1360
}
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1362 1363
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1364
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1365 1366
}

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1367 1368
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1369 1370
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
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1371 1372
}

1373 1374
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1375 1376
				  const void *daddr, const void *saddr,
				  unsigned len)
1377
{
1378
	if (!dev->header_ops || !dev->header_ops->create)
1379
		return 0;
1380 1381

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1382 1383
}

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1384 1385 1386 1387 1388
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1389
	if (!dev->header_ops || !dev->header_ops->parse)
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1390
		return 0;
1391
	return dev->header_ops->parse(skb, haddr);
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1392 1393
}

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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);
}

/*
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 * Incoming packets are placed on per-cpu queues
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1403
 */
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1404
struct softnet_data {
1405
	struct Qdisc		*output_queue;
1406
	struct Qdisc		**output_queue_tailp;
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1407 1408
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1409
	struct sk_buff_head	process_queue;
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1410

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	/* stats */
1412 1413 1414 1415
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
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1417
#ifdef CONFIG_RPS
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1418 1419 1420
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
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1421
	struct call_single_data	csd ____cacheline_aligned_in_smp;
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1422 1423
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
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1424
	unsigned int		input_queue_head;
1425
	unsigned int		input_queue_tail;
1426
#endif
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1427
	unsigned		dropped;
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1428
	struct sk_buff_head	input_pkt_queue;
1429
	struct napi_struct	backlog;
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1430 1431
};

1432
static inline void input_queue_head_incr(struct softnet_data *sd)
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1433 1434
{
#ifdef CONFIG_RPS
1435 1436 1437 1438 1439 1440 1441 1442 1443
	sd->input_queue_head++;
#endif
}

static inline void input_queue_tail_incr_save(struct softnet_data *sd,
					      unsigned int *qtail)
{
#ifdef CONFIG_RPS
	*qtail = ++sd->input_queue_tail;
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1444 1445 1446
#endif
}

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1447
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
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1448 1449 1450

#define HAVE_NETIF_QUEUE

1451
extern void __netif_schedule(struct Qdisc *q);
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1452

1453
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
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1454
{
1455
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1456
		__netif_schedule(txq->qdisc);
1457 1458
}

1459 1460 1461 1462 1463 1464 1465 1466
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));
}

1467 1468 1469 1470 1471
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1472 1473 1474 1475 1476 1477
/**
 *	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)
{
1480
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
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1481 1482
}

1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
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);
	}
}

1493
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
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1494 1495
{
#ifdef CONFIG_NETPOLL_TRAP
1496
	if (netpoll_trap()) {
1497
		netif_tx_start_queue(dev_queue);
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1498
		return;
1499
	}
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#endif
1501
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1502
		__netif_schedule(dev_queue->qdisc);
1503 1504
}

1505 1506 1507 1508 1509 1510 1511
/**
 *	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.
 */
1512 1513
static inline void netif_wake_queue(struct net_device *dev)
{
1514
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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}

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
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);
	}
}

1527 1528 1529 1530 1531
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1532 1533 1534 1535 1536 1537 1538
/**
 *	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)
{
1541
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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1542 1543
}

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

1554 1555 1556 1557 1558
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1559 1560 1561 1562 1563 1564
/**
 *	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)
{
1567
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
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}

1570 1571 1572 1573 1574
static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
}

1575 1576 1577 1578 1579 1580
/**
 *	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);
}

1586 1587 1588 1589 1590 1591
/*
 * 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.
 */
1592 1593 1594 1595 1596 1597 1598 1599

/**
 *	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.
 */
1600 1601
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1602
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1603 1604

	netif_tx_start_queue(txq);
1605 1606
}

1607 1608 1609 1610 1611 1612 1613
/**
 *	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.
 */
1614 1615
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1616
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1617 1618 1619 1620
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1621
	netif_tx_stop_queue(txq);
1622 1623
}

1624 1625 1626 1627 1628 1629 1630
/**
 *	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.
 */
1631
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1632 1633
					 u16 queue_index)
{
1634
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1635 1636

	return netif_tx_queue_stopped(txq);
1637 1638
}

1639 1640 1641 1642 1643
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));
}
1644 1645 1646 1647 1648 1649 1650 1651

/**
 *	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.
 */
1652 1653
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1654
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1655 1656 1657 1658
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1659
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1660
		__netif_schedule(txq->qdisc);
1661 1662
}

1663 1664 1665 1666 1667 1668
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1669 1670
static inline int netif_is_multiqueue(const struct net_device *dev)
{
1671
	return (dev->num_tx_queues > 1);
1672
}
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/* Use this variant when it is known for sure that it
1675 1676
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
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 */
1678
extern void dev_kfree_skb_irq(struct sk_buff *skb);
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1679 1680

/* Use this variant in places where it could be invoked
1681 1682
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
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 */
1684
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);
1691
extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
1692
					struct sk_buff *skb);
1693 1694
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,
1695
					 struct sk_buff *skb);
1696 1697
extern void		napi_reuse_skb(struct napi_struct *napi,
				       struct sk_buff *skb);
1698
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
1699
extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
1700 1701
					  struct sk_buff *skb,
					  gro_result_t ret);
1702
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
1703
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
1704 1705 1706 1707 1708 1709 1710

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

1711
extern int netdev_rx_handler_register(struct net_device *dev,
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1712 1713
				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
1714 1715
extern void netdev_rx_handler_unregister(struct net_device *dev);

1716
extern void		netif_nit_deliver(struct sk_buff *skb);
1717
extern int		dev_valid_name(const char *name);
1718 1719
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 *);
1721
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
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extern int		dev_change_flags(struct net_device *, unsigned);
1723
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
1724
extern int		dev_change_name(struct net_device *, const char *);
1725
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1726 1727
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 *);
1731
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1732 1733
					    struct net_device *dev,
					    struct netdev_queue *txq);
1734 1735
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
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1737
extern int		netdev_budget;
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/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

1742 1743 1744 1745
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1746
 * Release reference to device to allow it to be freed.
1747
 */
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static inline void dev_put(struct net_device *dev)
{
	atomic_dec(&dev->refcnt);
}

1753 1754 1755 1756
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1757
 * Hold reference to device to keep it from being freed.
1758
 */
1759 1760 1761 1762
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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1767 1768 1769 1770
 *
 * 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);
1774
extern void linkwatch_forget_dev(struct net_device *dev);
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1776 1777 1778 1779 1780 1781
/**
 *	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);
}

1787 1788
extern unsigned long dev_trans_start(struct net_device *dev);

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1789 1790
extern void __netdev_watchdog_up(struct net_device *dev);

1791
extern void netif_carrier_on(struct net_device *dev);
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1792

1793
extern void netif_carrier_off(struct net_device *dev);
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1794

1795 1796
extern void netif_notify_peers(struct net_device *dev);

1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
/**
 *	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);
}

1816 1817 1818 1819 1820 1821
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
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1822 1823 1824 1825 1826 1827
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1828 1829 1830 1831 1832 1833
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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1834 1835 1836 1837 1838 1839
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


1840 1841 1842 1843 1844 1845
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
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Eric Dumazet 已提交
1846 1847
static inline int netif_oper_up(const struct net_device *dev)
{
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1848 1849 1850 1851
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

1852 1853 1854 1855 1856 1857
/**
 *	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);
}

1863
extern void netif_device_detach(struct net_device *dev);
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1865
extern void netif_device_attach(struct net_device *dev);
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/*
 * Network interface message level settings
 */
#define HAVE_NETIF_MSG 1

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

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

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

1917
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
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1918
{
1919 1920
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
1921 1922
}

1923 1924 1925 1926 1927 1928
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
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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static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

1955 1956 1957 1958 1959 1960
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
1961 1962
static inline void netif_tx_lock(struct net_device *dev)
{
1963
	unsigned int i;
1964
	int cpu;
1965

1966 1967
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
1968 1969
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1970 1971 1972 1973 1974 1975 1976

		/* 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.
		 */
1977
		__netif_tx_lock(txq, cpu);
1978 1979
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
1980
	}
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1981 1982 1983 1984
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
1985 1986
	local_bh_disable();
	netif_tx_lock(dev);
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1987 1988 1989 1990
}

static inline void netif_tx_unlock(struct net_device *dev)
{
1991 1992 1993 1994
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
1995

1996 1997 1998 1999 2000
		/* 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);
2001
		netif_schedule_queue(txq);
2002 2003
	}
	spin_unlock(&dev->tx_global_lock);
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}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2008 2009
	netif_tx_unlock(dev);
	local_bh_enable();
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2010 2011
}

2012
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2013
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2014
		__netif_tx_lock(txq, cpu);		\
2015 2016 2017
	}						\
}

2018
#define HARD_TX_UNLOCK(dev, txq) {			\
2019
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2020
		__netif_tx_unlock(txq);			\
2021 2022 2023
	}						\
}

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2024 2025
static inline void netif_tx_disable(struct net_device *dev)
{
2026
	unsigned int i;
2027
	int cpu;
2028

2029 2030
	local_bh_disable();
	cpu = smp_processor_id();
2031 2032
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2033 2034

		__netif_tx_lock(txq, cpu);
2035
		netif_tx_stop_queue(txq);
2036
		__netif_tx_unlock(txq);
2037
	}
2038
	local_bh_enable();
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}

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
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);
}

2061
/*
2062
 * dev_addrs walker. Should be used only for read access. Call with
2063 2064 2065
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2066
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2067

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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 */
2073 2074 2075 2076 2077
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);
2080

2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
/* General hardware address lists handling functions */
extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
				  struct netdev_hw_addr_list *from_list,
				  int addr_len, unsigned char addr_type);
extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
				   struct netdev_hw_addr_list *from_list,
				   int addr_len, unsigned char addr_type);
extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
			  struct netdev_hw_addr_list *from_list,
			  int addr_len);
extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
			     struct netdev_hw_addr_list *from_list,
			     int addr_len);
extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
extern void __hw_addr_init(struct netdev_hw_addr_list *list);

2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
/* 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);
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
extern void dev_addr_flush(struct net_device *dev);
extern int dev_addr_init(struct net_device *dev);

/* Functions used for unicast addresses handling */
extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
extern void dev_uc_flush(struct net_device *dev);
extern void dev_uc_init(struct net_device *dev);
2118

2119 2120 2121 2122 2123 2124 2125 2126 2127
/* Functions used for multicast addresses handling */
extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);
2128

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/* Functions used for secondary unicast and multicast support */
extern void		dev_set_rx_mode(struct net_device *dev);
extern void		__dev_set_rx_mode(struct net_device *dev);
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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);
2135
extern int		netdev_bonding_change(struct net_device *dev,
2136
					      unsigned long event);
2137
extern void		netdev_features_change(struct net_device *dev);
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/* Load a device via the kmod */
2139
extern void		dev_load(struct net *net, const char *name);
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extern void		dev_mcast_init(void);
2141
extern const struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev);
2142
extern void		dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
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extern int		netdev_max_backlog;
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extern int		netdev_tstamp_prequeue;
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extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
2148
extern int skb_checksum_help(struct sk_buff *skb);
2149
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
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#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);

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#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

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

2170
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
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extern void linkwatch_run_queue(void);

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

2181
static inline int net_gso_ok(int features, int gso_type)
2182
{
2183
	int feature = gso_type << NETIF_F_GSO_SHIFT;
2184
	return (features & feature) == feature;
2185 2186
}

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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) &&
2190
	       (!skb_has_frags(skb) || (features & NETIF_F_FRAGLIST));
2191 2192
}

2193 2194
static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
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	return skb_is_gso(skb) &&
	       (!skb_gso_ok(skb, dev->features) ||
2197
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2198 2199
}

2200 2201 2202 2203 2204 2205
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

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extern int __skb_bond_should_drop(struct sk_buff *skb,
				  struct net_device *master);
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static inline int skb_bond_should_drop(struct sk_buff *skb,
				       struct net_device *master)
2211
{
2212 2213
	if (master)
		return __skb_bond_should_drop(skb, master);
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	return 0;
}

2217
extern struct pernet_operations __net_initdata loopback_net_ops;
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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)							\
2359
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2360 2361 2362
	0;							\
})
#endif
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#endif /* __KERNEL__ */

2366
#endif	/* _LINUX_NETDEVICE_H */