netdevice.h 76.6 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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struct phy_device;
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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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/* hardware address assignment types */
#define NET_ADDR_PERM		0	/* address is permanent (default) */
#define NET_ADDR_RANDOM		1	/* address is generated randomly */
#define NET_ADDR_STOLEN		2	/* address is stolen from other device */

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

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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.
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 */
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struct net_device_stats {
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	unsigned long	rx_packets;
	unsigned long	tx_packets;
	unsigned long	rx_bytes;
	unsigned long	tx_bytes;
	unsigned long	rx_errors;
	unsigned long	tx_errors;
	unsigned long	rx_dropped;
	unsigned long	tx_dropped;
	unsigned long	multicast;
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	unsigned long	collisions;
	unsigned long	rx_length_errors;
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	unsigned long	rx_over_errors;
	unsigned long	rx_crc_errors;
	unsigned long	rx_frame_errors;
	unsigned long	rx_fifo_errors;
	unsigned long	rx_missed_errors;
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	unsigned long	tx_aborted_errors;
	unsigned long	tx_carrier_errors;
	unsigned long	tx_fifo_errors;
	unsigned long	tx_heartbeat_errors;
	unsigned long	tx_window_errors;
	unsigned long	rx_compressed;
	unsigned long	tx_compressed;
};

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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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	bool			synced;
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	bool			global_use;
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	int			refcount;
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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)];
};

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static inline void hh_cache_put(struct hh_cache *hh)
{
	if (atomic_dec_and_test(&hh->hh_refcnt))
		kfree(hh);
}

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/* 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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#define QUEUE_STATE_XOFF_OR_FROZEN ((1 << __QUEUE_STATE_XOFF)		| \
				    (1 << __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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#ifdef CONFIG_RPS
	struct kobject		kobj;
#endif
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#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	int			numa_node;
#endif
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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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} ____cacheline_aligned_in_smp;
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static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
{
#if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
	return q->numa_node;
#else
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	return NUMA_NO_NODE;
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#endif
}

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

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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;
}

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extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
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	struct rps_map __rcu		*rps_map;
	struct rps_dev_flow_table __rcu	*rps_flow_table;
	struct kobject			kobj;
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	struct net_device		*dev;
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} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
622

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

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

649 650 651 652 653 654 655 656
#define TC_MAX_QUEUE	16
#define TC_BITMASK	15
/* HW offloaded queuing disciplines txq count and offset maps */
struct netdev_tc_txq {
	u16 count;
	u16 offset;
};

657 658
/*
 * This structure defines the management hooks for network devices.
659 660
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
 *
 * 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.
 *
680 681
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
682
 *	Called when a packet needs to be transmitted.
683 684
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
685 686 687 688 689 690
 *	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.
 *
691 692 693 694 695 696 697 698 699 700 701 702
 * 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
703
 *	needs to be changed. If this interface is not defined, the
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
 *	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.
 *
724
 * void (*ndo_tx_timeout)(struct net_device *dev);
725 726 727
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
728
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
729
 *                      struct rtnl_link_stats64 *storage);
730
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
731
 *	Called when a user wants to get the network device usage
732
 *	statistics. Drivers must do one of the following:
733 734
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
735
 *	2. Define @ndo_get_stats to update a net_device_stats structure
736 737 738 739 740
 *	   (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.
741 742
 *
 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
743
 *	If device support VLAN receive acceleration
744 745 746 747 748 749 750 751 752 753 754 755 756
 *	(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);
757 758 759 760 761 762 763
 *
 *	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);
764 765 766
 * 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);
767 768 769 770 771
 * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
 * 	Called to setup 'tc' number of traffic classes in the net device. This
 * 	is always called from the stack with the rtnl lock held and netif tx
 * 	queues stopped. This allows the netdevice to perform queue management
 * 	safely.
772
 */
773
#define HAVE_NET_DEVICE_OPS
774 775 776 777 778
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);
779
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
780 781 782
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
783 784 785 786 787 788 789 790 791 792 793
	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);
794 795 796 797
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
798 799
	void			(*ndo_tx_timeout) (struct net_device *dev);

800 801
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
802 803 804 805 806 807 808 809 810 811
	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);
814
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
815
#endif
816 817 818 819 820 821 822 823 824
	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);
825 826 827 828 829
	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);
830
	int			(*ndo_setup_tc)(struct net_device *dev, u8 tc);
831
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
832 833
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
834 835 836 837 838 839
	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);
840 841 842 843
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
844
#endif
845 846
};

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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
862
	 * of the interface.
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	 */
	char			name[IFNAMSIZ];
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866
	struct pm_qos_request_list pm_qos_req;
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868 869
	/* device name hash chain */
	struct hlist_node	name_hlist;
870 871
	/* 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;

892
	struct list_head	dev_list;
893
	struct list_head	napi_list;
894
	struct list_head	unreg_list;
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896 897 898
	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
899
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
900 901
#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
902
#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
903 904 905 906 907 908
#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. */
910 911
#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
912
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
913
#define NETIF_F_GRO		16384	/* Generic receive offload */
914
#define NETIF_F_LRO		32768	/* large receive offload */
915

916
/* the GSO_MASK reserves bits 16 through 23 */
917
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
918
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
919
#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
920
#define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
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stephen hemminger 已提交
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#define NETIF_F_RXHASH		(1 << 28) /* Receive hashing offload */
922

923
	/* Segmentation offload features */
924
#define NETIF_F_GSO_SHIFT	16
925
#define NETIF_F_GSO_MASK	0x00ff0000
926
#define NETIF_F_TSO		(SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
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927
#define NETIF_F_UFO		(SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
928
#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)
931
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
932

933
	/* List of features with software fallbacks. */
934 935
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | \
				 NETIF_F_TSO6 | NETIF_F_UFO)
936

937

938
#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
939 940 941
#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)
942

943 944 945 946 947
	/*
	 * 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 | \
948
				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
949 950
				 NETIF_F_FRAGLIST)

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

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	struct net_device_stats	stats;
956 957 958
	atomic_long_t		rx_dropped; /* dropped packets by core network
					     * Do not use this in drivers.
					     */
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960
#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;
966
#endif
967 968
	/* Management operations */
	const struct net_device_ops *netdev_ops;
969
	const struct ethtool_ops *ethtool_ops;
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971 972 973
	/* Hardware header description */
	const struct header_ops *header_ops;

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974
	unsigned int		flags;	/* interface flags (a la BSD)	*/
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975
	unsigned short		gflags;
976
        unsigned int            priv_flags; /* Like 'flags' but invisible to userspace. */
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	unsigned short		padded;	/* How much padding added by alloc_netdev() */

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979 980 981
	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

982
	unsigned int		mtu;	/* interface MTU value		*/
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	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

986 987 988 989 990 991 992
	/* 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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	/* Interface address info. */
994
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
995
	unsigned char		addr_assign_type; /* hw address assignment type */
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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;
1000 1001 1002
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
	int			uc_promisc;
1003 1004
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
1008 1009

#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
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	struct vlan_group __rcu	*vlgrp;		/* VLAN group */
1011
#endif
1012 1013 1014
#ifdef CONFIG_NET_DSA
	void			*dsa_ptr;	/* dsa specific data */
#endif
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	void 			*atalk_ptr;	/* AppleTalk link 	*/
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1016
	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
1017
	struct dn_dev __rcu     *dn_ptr;        /* DECnet specific data */
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	struct inet6_dev __rcu	*ip6_ptr;       /* IPv6 specific data */
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1019 1020
	void			*ec_ptr;	/* Econet specific data	*/
	void			*ax25_ptr;	/* AX.25 specific data */
1021 1022
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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1024
/*
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1025
 * Cache lines mostly used on receive path (including eth_type_trans())
1026
 */
1027 1028 1029 1030 1031 1032 1033 1034
	unsigned long		last_rx;	/* Time of last Rx
						 * This should not be set in
						 * drivers, unless really needed,
						 * because network stack (bonding)
						 * use it if/when necessary, to
						 * avoid dirtying this cache line.
						 */

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

1039
	/* Interface address info used in eth_type_trans() */
1040 1041 1042 1043
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

1044 1045
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
1046 1047

	unsigned char		broadcast[MAX_ADDR_LEN];	/* hw bcast add	*/
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1049
#ifdef CONFIG_RPS
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1050 1051 1052 1053
	struct kset		*queues_kset;

	struct netdev_rx_queue	*_rx;

1054
	/* Number of RX queues allocated at register_netdev() time */
T
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1055
	unsigned int		num_rx_queues;
1056 1057 1058

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
E
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1059
#endif
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1060

1061 1062
	rx_handler_func_t __rcu	*rx_handler;
	void __rcu		*rx_handler_data;
1063

1064
	struct netdev_queue __rcu *ingress_queue;
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1065 1066 1067 1068

/*
 * Cache lines mostly used on transmit path
 */
1069
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
1070 1071

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
1072
	unsigned int		num_tx_queues;
1073 1074 1075 1076

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

1077 1078 1079
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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1080
	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1081
	spinlock_t		tx_global_lock;
E
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1082

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1083
#ifdef CONFIG_XPS
E
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1084
	struct xps_dev_maps __rcu *xps_maps;
T
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1085
#endif
T
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1086

1087
	/* These may be needed for future network-power-down code. */
1088 1089 1090 1091 1092

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1093 1094 1095 1096 1097
	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 */
E
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1099
	int __percpu		*pcpu_refcnt;
1100

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1101 1102 1103 1104 1105
	/* delayed register/unregister */
	struct list_head	todo_list;
	/* device index hash chain */
	struct hlist_node	index_hlist;

1106
	struct list_head	link_watch_list;
1107

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1108 1109
	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1110
	       NETREG_REGISTERED,	/* completed register_netdevice */
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1111 1112 1113
	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1114
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1115 1116 1117 1118 1119 1120
	} reg_state:16;

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1122 1123
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
L
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1124 1125

#ifdef CONFIG_NETPOLL
1126
	struct netpoll_info	*npinfo;
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1127
#endif
1128

1129
#ifdef CONFIG_NET_NS
1130 1131
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1132
#endif
1133

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1134
	/* mid-layer private */
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1135 1136 1137
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1138
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1139
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
E
Eric Dumazet 已提交
1140
	};
1141
	/* GARP */
E
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1142
	struct garp_port __rcu	*garp_port;
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1143 1144

	/* class/net/name entry */
1145
	struct device		dev;
1146 1147
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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1148 1149 1150

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1151

1152 1153 1154
	/* VLAN feature mask */
	unsigned long vlan_features;

1155 1156 1157
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1158

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1159
#ifdef CONFIG_DCB
1160
	/* Data Center Bridging netlink ops */
1161
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1162
#endif
1163 1164 1165
	u8 num_tc;
	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
	u8 prio_tc_map[TC_BITMASK + 1];
1166

1167 1168 1169 1170
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
1171 1172
	/* n-tuple filter list attached to this device */
	struct ethtool_rx_ntuple_list ethtool_ntuple_list;
1173 1174 1175

	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
1176 1177 1178

	/* group the device belongs to */
	int group;
L
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1179
};
1180
#define to_net_dev(d) container_of(d, struct net_device, dev)
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1181 1182 1183

#define	NETDEV_ALIGN		32

1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
static inline
int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
{
	return dev->prio_tc_map[prio & TC_BITMASK];
}

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

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

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

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

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

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

	dev->num_tc = num_tc;
	return 0;
}

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

1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
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);
}

1254 1255 1256 1257 1258 1259
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
E
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	return read_pnet(&dev->nd_net);
1261 1262 1263
}

static inline
1264
void dev_net_set(struct net_device *dev, struct net *net)
1265 1266
{
#ifdef CONFIG_NET_NS
1267 1268
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1269 1270 1271
#endif
}

1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
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;
}

1282 1283 1284 1285 1286 1287 1288 1289 1290
#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

1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
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;
}

1301 1302 1303 1304 1305 1306
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1307
static inline void *netdev_priv(const struct net_device *dev)
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{
1309
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1310 1311 1312 1313 1314
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1315
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1317 1318 1319 1320 1321 1322
/* 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))

1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
/**
 *	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.
 */
1333 1334
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1335

1336 1337 1338 1339 1340 1341
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1342 1343 1344
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1345 1346 1347
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1348 1349 1350
	/* Length of frag0. */
	unsigned int frag0_len;

1351 1352 1353
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1354 1355 1356 1357 1358 1359 1360 1361
	/* 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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1362 1363 1364

	/* Free the skb? */
	int free;
1365 1366 1367
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1368

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1369
struct packet_type {
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1370 1371 1372 1373 1374 1375
	__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 *);
1376 1377
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1378
	int			(*gso_send_check)(struct sk_buff *skb);
1379 1380 1381
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
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1382 1383 1384 1385 1386 1387 1388 1389 1390
	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 */

1391

1392 1393
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1394 1395
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1396 1397
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1398 1399 1400 1401
#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)
1402 1403
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1404
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1405

1406 1407 1408 1409 1410
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1411
	net = dev_net(dev);
1412 1413 1414 1415
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
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);
}

1426 1427 1428 1429 1430
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);
}
1431

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1432 1433
extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1434 1435
extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
					      const char *hwaddr);
1436 1437
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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1438 1439 1440 1441
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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1442 1443
extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1444
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1445
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1446
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
L
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1447 1448 1449
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);
1450
extern void		dev_disable_lro(struct net_device *dev);
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1451 1452
extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
1453 1454
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1455
extern void		unregister_netdevice_many(struct list_head *head);
1456 1457 1458 1459 1460
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

E
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1461
extern int 		netdev_refcnt_read(const struct net_device *dev);
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1462 1463 1464 1465
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);
1466
extern int		init_dummy_netdev(struct net_device *dev);
1467
extern void		netdev_resync_ops(struct net_device *dev);
1468

1469
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1470 1471
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);
1472
extern struct net_device	*dev_get_by_index_rcu(struct net *net, int ifindex);
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1473 1474 1475 1476
extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif
1477 1478
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1479
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495

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;
}

1496 1497
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1498
{
1499 1500
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1501

1502 1503 1504 1505
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1506

1507 1508 1509 1510 1511 1512
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;
1513
}
L
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1514

1515 1516
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1517
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1518 1519
}

H
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1520 1521
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1522 1523
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
H
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1524 1525
}

1526 1527
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1528 1529
				  const void *daddr, const void *saddr,
				  unsigned len)
1530
{
1531
	if (!dev->header_ops || !dev->header_ops->create)
1532
		return 0;
1533 1534

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1535 1536
}

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Stephen Hemminger 已提交
1537 1538 1539 1540 1541
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1542
	if (!dev->header_ops || !dev->header_ops->parse)
S
Stephen Hemminger 已提交
1543
		return 0;
1544
	return dev->header_ops->parse(skb, haddr);
S
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1545 1546
}

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1547 1548 1549 1550 1551 1552 1553 1554
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);
}

/*
E
Eric Dumazet 已提交
1555
 * Incoming packets are placed on per-cpu queues
L
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1556
 */
E
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1557
struct softnet_data {
1558
	struct Qdisc		*output_queue;
1559
	struct Qdisc		**output_queue_tailp;
L
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1560 1561
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1562
	struct sk_buff_head	process_queue;
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1563

C
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1564
	/* stats */
1565 1566 1567 1568
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
C
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1569

1570
#ifdef CONFIG_RPS
E
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1571 1572 1573
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
T
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1574
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
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1575 1576
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
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1577
	unsigned int		input_queue_head;
1578
	unsigned int		input_queue_tail;
1579
#endif
C
Changli Gao 已提交
1580
	unsigned		dropped;
T
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1581
	struct sk_buff_head	input_pkt_queue;
1582
	struct napi_struct	backlog;
L
Linus Torvalds 已提交
1583 1584
};

1585
static inline void input_queue_head_incr(struct softnet_data *sd)
T
Tom Herbert 已提交
1586 1587
{
#ifdef CONFIG_RPS
1588 1589 1590 1591 1592 1593 1594 1595 1596
	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;
T
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1597 1598 1599
#endif
}

T
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1600
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
L
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1601 1602 1603

#define HAVE_NETIF_QUEUE

1604
extern void __netif_schedule(struct Qdisc *q);
L
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1605

1606
static inline void netif_schedule_queue(struct netdev_queue *txq)
L
Linus Torvalds 已提交
1607
{
1608
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1609
		__netif_schedule(txq->qdisc);
1610 1611
}

1612 1613 1614 1615 1616 1617 1618 1619
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));
}

1620 1621 1622 1623 1624
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1625 1626 1627 1628 1629 1630
/**
 *	netif_start_queue - allow transmit
 *	@dev: network device
 *
 *	Allow upper layers to call the device hard_start_xmit routine.
 */
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1631 1632
static inline void netif_start_queue(struct net_device *dev)
{
1633
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
L
Linus Torvalds 已提交
1634 1635
}

1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
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);
	}
}

1646
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
L
Linus Torvalds 已提交
1647 1648
{
#ifdef CONFIG_NETPOLL_TRAP
1649
	if (netpoll_trap()) {
1650
		netif_tx_start_queue(dev_queue);
L
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1651
		return;
1652
	}
L
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1653
#endif
1654
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1655
		__netif_schedule(dev_queue->qdisc);
1656 1657
}

1658 1659 1660 1661 1662 1663 1664
/**
 *	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.
 */
1665 1666
static inline void netif_wake_queue(struct net_device *dev)
{
1667
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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}

1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
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);
	}
}

1680 1681
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
1682 1683 1684 1685 1686
	if (WARN_ON(!dev_queue)) {
		printk(KERN_INFO "netif_stop_queue() cannot be called before "
		       "register_netdev()");
		return;
	}
1687 1688 1689
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1690 1691 1692 1693 1694 1695 1696
/**
 *	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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1697 1698
static inline void netif_stop_queue(struct net_device *dev)
{
1699
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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1700 1701
}

1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
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);
	}
}

1712 1713 1714 1715 1716
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1717 1718 1719 1720 1721 1722
/**
 *	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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1723 1724
static inline int netif_queue_stopped(const struct net_device *dev)
{
1725
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
L
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1726 1727
}

1728
static inline int netif_tx_queue_frozen_or_stopped(const struct netdev_queue *dev_queue)
1729
{
1730
	return dev_queue->state & QUEUE_STATE_XOFF_OR_FROZEN;
1731 1732
}

1733 1734 1735 1736 1737 1738
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
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1739 1740 1741 1742 1743
static inline int netif_running(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

1744 1745 1746 1747 1748 1749
/*
 * 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.
 */
1750 1751 1752 1753 1754 1755 1756 1757

/**
 *	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.
 */
1758 1759
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1760
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1761 1762

	netif_tx_start_queue(txq);
1763 1764
}

1765 1766 1767 1768 1769 1770 1771
/**
 *	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.
 */
1772 1773
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1774
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1775 1776 1777 1778
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1779
	netif_tx_stop_queue(txq);
1780 1781
}

1782 1783 1784 1785 1786 1787 1788
/**
 *	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.
 */
1789
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1790 1791
					 u16 queue_index)
{
1792
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1793 1794

	return netif_tx_queue_stopped(txq);
1795 1796
}

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

/**
 *	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.
 */
1810 1811
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1812
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1813 1814 1815 1816
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1817
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1818
		__netif_schedule(txq->qdisc);
1819 1820
}

1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
/*
 * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
 * as a distribution range limit for the returned value.
 */
static inline u16 skb_tx_hash(const struct net_device *dev,
			      const struct sk_buff *skb)
{
	return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
}

1831 1832 1833 1834 1835 1836
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1837 1838
static inline int netif_is_multiqueue(const struct net_device *dev)
{
E
Eric Dumazet 已提交
1839
	return dev->num_tx_queues > 1;
1840
}
L
Linus Torvalds 已提交
1841

1842 1843
extern int netif_set_real_num_tx_queues(struct net_device *dev,
					unsigned int txq);
1844

1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855
#ifdef CONFIG_RPS
extern int netif_set_real_num_rx_queues(struct net_device *dev,
					unsigned int rxq);
#else
static inline int netif_set_real_num_rx_queues(struct net_device *dev,
						unsigned int rxq)
{
	return 0;
}
#endif

1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
static inline int netif_copy_real_num_queues(struct net_device *to_dev,
					     const struct net_device *from_dev)
{
	netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
#ifdef CONFIG_RPS
	return netif_set_real_num_rx_queues(to_dev,
					    from_dev->real_num_rx_queues);
#else
	return 0;
#endif
}

L
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1868
/* Use this variant when it is known for sure that it
1869 1870
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
L
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1871
 */
1872
extern void dev_kfree_skb_irq(struct sk_buff *skb);
L
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1873 1874

/* Use this variant in places where it could be invoked
1875 1876
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
L
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1877
 */
1878
extern void dev_kfree_skb_any(struct sk_buff *skb);
L
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1879 1880 1881 1882 1883 1884

#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);
1885
extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
1886
					struct sk_buff *skb);
1887 1888
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,
1889
					 struct sk_buff *skb);
E
Eric Dumazet 已提交
1890
extern void		napi_gro_flush(struct napi_struct *napi);
1891
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
1892
extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
1893 1894
					  struct sk_buff *skb,
					  gro_result_t ret);
1895
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
1896
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
1897 1898 1899 1900 1901 1902 1903

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

1904
extern int netdev_rx_handler_register(struct net_device *dev,
J
Jiri Pirko 已提交
1905 1906
				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
1907 1908
extern void netdev_rx_handler_unregister(struct net_device *dev);

1909
extern int		dev_valid_name(const char *name);
1910 1911
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
L
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1912
extern unsigned		dev_get_flags(const struct net_device *);
1913
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
L
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1914
extern int		dev_change_flags(struct net_device *, unsigned);
1915
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
1916
extern int		dev_change_name(struct net_device *, const char *);
1917
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1918 1919
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
L
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1920
extern int		dev_set_mtu(struct net_device *, int);
1921
extern void		dev_set_group(struct net_device *, int);
L
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1922 1923
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
1924
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1925 1926
					    struct net_device *dev,
					    struct netdev_queue *txq);
1927 1928
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
L
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1929

1930
extern int		netdev_budget;
L
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1931 1932 1933 1934

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

1935 1936 1937 1938
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1939
 * Release reference to device to allow it to be freed.
1940
 */
L
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1941 1942
static inline void dev_put(struct net_device *dev)
{
E
Eric Dumazet 已提交
1943
	irqsafe_cpu_dec(*dev->pcpu_refcnt);
L
Linus Torvalds 已提交
1944 1945
}

1946 1947 1948 1949
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1950
 * Hold reference to device to keep it from being freed.
1951
 */
1952 1953
static inline void dev_hold(struct net_device *dev)
{
E
Eric Dumazet 已提交
1954
	irqsafe_cpu_inc(*dev->pcpu_refcnt);
1955
}
L
Linus Torvalds 已提交
1956 1957 1958 1959

/* Carrier loss detection, dial on demand. The functions netif_carrier_on
 * and _off may be called from IRQ context, but it is caller
 * who is responsible for serialization of these calls.
S
Stefan Rompf 已提交
1960 1961 1962 1963
 *
 * The name carrier is inappropriate, these functions should really be
 * called netif_lowerlayer_*() because they represent the state of any
 * kind of lower layer not just hardware media.
L
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1964 1965 1966
 */

extern void linkwatch_fire_event(struct net_device *dev);
1967
extern void linkwatch_forget_dev(struct net_device *dev);
L
Linus Torvalds 已提交
1968

1969 1970 1971 1972 1973 1974
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
L
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1975 1976 1977 1978 1979
static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

1980 1981
extern unsigned long dev_trans_start(struct net_device *dev);

L
Linus Torvalds 已提交
1982 1983
extern void __netdev_watchdog_up(struct net_device *dev);

1984
extern void netif_carrier_on(struct net_device *dev);
L
Linus Torvalds 已提交
1985

1986
extern void netif_carrier_off(struct net_device *dev);
L
Linus Torvalds 已提交
1987

1988 1989
extern void netif_notify_peers(struct net_device *dev);

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
/**
 *	netif_dormant_on - mark device as dormant.
 *	@dev: network device
 *
 * Mark device as dormant (as per RFC2863).
 *
 * The dormant state indicates that the relevant interface is not
 * actually in a condition to pass packets (i.e., it is not 'up') but is
 * in a "pending" state, waiting for some external event.  For "on-
 * demand" interfaces, this new state identifies the situation where the
 * interface is waiting for events to place it in the up state.
 *
 */
S
Stefan Rompf 已提交
2003 2004 2005 2006 2007 2008
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2009 2010 2011 2012 2013 2014
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
S
Stefan Rompf 已提交
2015 2016 2017 2018 2019 2020
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

2021 2022 2023 2024 2025 2026
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
S
Stefan Rompf 已提交
2027 2028 2029 2030 2031 2032
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


2033 2034 2035 2036 2037 2038
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
E
Eric Dumazet 已提交
2039 2040
static inline int netif_oper_up(const struct net_device *dev)
{
S
Stefan Rompf 已提交
2041 2042 2043 2044
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

2045 2046 2047 2048 2049 2050
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
L
Linus Torvalds 已提交
2051 2052 2053 2054 2055
static inline int netif_device_present(struct net_device *dev)
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

2056
extern void netif_device_detach(struct net_device *dev);
L
Linus Torvalds 已提交
2057

2058
extern void netif_device_attach(struct net_device *dev);
L
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2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109

/*
 * 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;
}

2110
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
H
Herbert Xu 已提交
2111
{
2112 2113
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
2114 2115
}

2116 2117 2118 2119 2120 2121
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
static inline int __netif_tx_trylock(struct netdev_queue *txq)
{
	int ok = spin_trylock(&txq->_xmit_lock);
	if (likely(ok))
		txq->xmit_lock_owner = smp_processor_id();
	return ok;
}

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

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

E
Eric Dumazet 已提交
2142 2143 2144 2145 2146 2147
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

2148 2149 2150 2151 2152 2153
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2154 2155
static inline void netif_tx_lock(struct net_device *dev)
{
2156
	unsigned int i;
2157
	int cpu;
2158

2159 2160
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2161 2162
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2163 2164 2165 2166 2167 2168 2169

		/* 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.
		 */
2170
		__netif_tx_lock(txq, cpu);
2171 2172
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2173
	}
H
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2174 2175 2176 2177
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2178 2179
	local_bh_disable();
	netif_tx_lock(dev);
H
Herbert Xu 已提交
2180 2181 2182 2183
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2184 2185 2186 2187
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2188

2189 2190 2191 2192 2193
		/* 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);
2194
		netif_schedule_queue(txq);
2195 2196
	}
	spin_unlock(&dev->tx_global_lock);
H
Herbert Xu 已提交
2197 2198 2199 2200
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2201 2202
	netif_tx_unlock(dev);
	local_bh_enable();
H
Herbert Xu 已提交
2203 2204
}

2205
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2206
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2207
		__netif_tx_lock(txq, cpu);		\
2208 2209 2210
	}						\
}

2211
#define HARD_TX_UNLOCK(dev, txq) {			\
2212
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2213
		__netif_tx_unlock(txq);			\
2214 2215 2216
	}						\
}

L
Linus Torvalds 已提交
2217 2218
static inline void netif_tx_disable(struct net_device *dev)
{
2219
	unsigned int i;
2220
	int cpu;
2221

2222 2223
	local_bh_disable();
	cpu = smp_processor_id();
2224 2225
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2226 2227

		__netif_tx_lock(txq, cpu);
2228
		netif_tx_stop_queue(txq);
2229
		__netif_tx_unlock(txq);
2230
	}
2231
	local_bh_enable();
L
Linus Torvalds 已提交
2232 2233
}

2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253
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);
}

2254
/*
2255
 * dev_addrs walker. Should be used only for read access. Call with
2256 2257 2258
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2259
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2260

L
Linus Torvalds 已提交
2261 2262 2263 2264 2265
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
T
Tom Herbert 已提交
2266
extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
2267
				       void (*setup)(struct net_device *),
T
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2268
				       unsigned int txqs, unsigned int rxqs);
2269
#define alloc_netdev(sizeof_priv, name, setup) \
T
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2270 2271 2272 2273 2274
	alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)

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

L
Linus Torvalds 已提交
2275 2276
extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
2277

2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293
/* 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);

2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304
/* 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);
2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
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);
2315

2316 2317 2318 2319 2320 2321 2322 2323 2324
/* 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);
2325

2326 2327 2328
/* 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);
2329 2330
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
L
Linus Torvalds 已提交
2331
extern void		netdev_state_change(struct net_device *dev);
2332
extern int		netdev_bonding_change(struct net_device *dev,
2333
					      unsigned long event);
2334
extern void		netdev_features_change(struct net_device *dev);
L
Linus Torvalds 已提交
2335
/* Load a device via the kmod */
2336
extern void		dev_load(struct net *net, const char *name);
L
Linus Torvalds 已提交
2337
extern void		dev_mcast_init(void);
2338 2339
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					       struct rtnl_link_stats64 *storage);
2340

L
Linus Torvalds 已提交
2341
extern int		netdev_max_backlog;
E
Eric Dumazet 已提交
2342
extern int		netdev_tstamp_prequeue;
L
Linus Torvalds 已提交
2343 2344
extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
2345
extern int skb_checksum_help(struct sk_buff *skb);
2346
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
2347 2348 2349 2350 2351 2352 2353
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
L
Linus Torvalds 已提交
2354 2355 2356 2357
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2358 2359 2360 2361 2362 2363
#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

2364 2365 2366
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2367 2368
extern struct kobj_ns_type_operations net_ns_type_operations;

2369
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
2370

2371 2372
extern void linkwatch_run_queue(void);

2373 2374 2375
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);
2376

2377 2378 2379
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2380
int netif_skb_features(struct sk_buff *skb);
2381

2382
static inline int net_gso_ok(int features, int gso_type)
2383
{
2384
	int feature = gso_type << NETIF_F_GSO_SHIFT;
2385
	return (features & feature) == feature;
2386 2387
}

2388 2389
static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
H
Herbert Xu 已提交
2390
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2391
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2392 2393
}

2394
static inline int netif_needs_gso(struct sk_buff *skb, int features)
2395
{
2396 2397
	return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2398 2399
}

2400 2401 2402 2403 2404 2405
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2406 2407
extern int __skb_bond_should_drop(struct sk_buff *skb,
				  struct net_device *master);
2408

2409 2410
static inline int skb_bond_should_drop(struct sk_buff *skb,
				       struct net_device *master)
2411
{
2412 2413
	if (master)
		return __skb_bond_should_drop(skb, master);
2414 2415 2416
	return 0;
}

2417
extern struct pernet_operations __net_initdata loopback_net_ops;
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439

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);
}
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451

/* 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;
}

2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
extern int netdev_printk(const char *level, const struct net_device *dev,
			 const char *format, ...)
	__attribute__ ((format (printf, 3, 4)));
extern int netdev_emerg(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_alert(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_crit(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_err(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_warn(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_notice(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int netdev_info(const struct net_device *dev, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));
2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507

#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);

2508 2509 2510 2511 2512 2513 2514 2515
/* 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)

2516 2517 2518 2519 2520 2521
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

2522
#define netif_emerg(priv, type, dev, fmt, args...)		\
2523
	netif_level(emerg, priv, type, dev, fmt, ##args)
2524
#define netif_alert(priv, type, dev, fmt, args...)		\
2525
	netif_level(alert, priv, type, dev, fmt, ##args)
2526
#define netif_crit(priv, type, dev, fmt, args...)		\
2527
	netif_level(crit, priv, type, dev, fmt, ##args)
2528
#define netif_err(priv, type, dev, fmt, args...)		\
2529
	netif_level(err, priv, type, dev, fmt, ##args)
2530
#define netif_warn(priv, type, dev, fmt, args...)		\
2531
	netif_level(warn, priv, type, dev, fmt, ##args)
2532
#define netif_notice(priv, type, dev, fmt, args...)		\
2533
	netif_level(notice, priv, type, dev, fmt, ##args)
2534
#define netif_info(priv, type, dev, fmt, args...)		\
2535
	netif_level(info, priv, type, dev, fmt, ##args)
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557

#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)
2558
#define netif_vdbg	netif_dbg
2559 2560 2561 2562
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
2563
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2564 2565 2566
	0;							\
})
#endif
2567

L
Linus Torvalds 已提交
2568 2569
#endif /* __KERNEL__ */

2570
#endif	/* _LINUX_NETDEVICE_H */