netdevice.h 72.9 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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/*
 * 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)];
};

/* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
 * Alternative is:
 *   dev->hard_header_len ? (dev->hard_header_len +
 *                           (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
 *
 * We could use other alignment values, but we must maintain the
 * relationship HH alignment <= LL alignment.
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 *
 * LL_ALLOCATED_SPACE also takes into account the tailroom the device
 * may need.
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 */
#define LL_RESERVED_SPACE(dev) \
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	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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#define LL_RESERVED_SPACE_EXTRA(dev,extra) \
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	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
#define LL_ALLOCATED_SPACE(dev) \
	((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
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struct header_ops {
	int	(*create) (struct sk_buff *skb, struct net_device *dev,
			   unsigned short type, const void *daddr,
			   const void *saddr, unsigned len);
	int	(*parse)(const struct sk_buff *skb, unsigned char *haddr);
	int	(*rebuild)(struct sk_buff *skb);
#define HAVE_HEADER_CACHE
	int	(*cache)(const struct neighbour *neigh, struct hh_cache *hh);
	void	(*cache_update)(struct hh_cache *hh,
				const struct net_device *dev,
				const unsigned char *haddr);
};

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/* These flag bits are private to the generic network queueing
 * layer, they may not be explicitly referenced by any other
 * code.
 */

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enum netdev_state_t {
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	__LINK_STATE_START,
	__LINK_STATE_PRESENT,
	__LINK_STATE_NOCARRIER,
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	__LINK_STATE_LINKWATCH_PENDING,
	__LINK_STATE_DORMANT,
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};


/*
 * This structure holds at boot time configured netdevice settings. They
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 * are then used in the device probing.
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 */
struct netdev_boot_setup {
	char name[IFNAMSIZ];
	struct ifmap map;
};
#define NETDEV_BOOT_SETUP_MAX 8

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extern int __init netdev_boot_setup(char *str);
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/*
 * Structure for NAPI scheduling similar to tasklet but with weighting
 */
struct napi_struct {
	/* The poll_list must only be managed by the entity which
	 * changes the state of the NAPI_STATE_SCHED bit.  This means
	 * whoever atomically sets that bit can add this napi_struct
	 * to the per-cpu poll_list, and whoever clears that bit
	 * can remove from the list right before clearing the bit.
	 */
	struct list_head	poll_list;

	unsigned long		state;
	int			weight;
	int			(*poll)(struct napi_struct *, int);
#ifdef CONFIG_NETPOLL
	spinlock_t		poll_lock;
	int			poll_owner;
#endif
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	unsigned int		gro_count;

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

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

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enum gro_result {
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	GRO_MERGED,
	GRO_MERGED_FREE,
	GRO_HELD,
	GRO_NORMAL,
	GRO_DROP,
};
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typedef enum gro_result gro_result_t;
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typedef struct sk_buff *rx_handler_func_t(struct sk_buff *skb);

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

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/**
 *	napi_schedule_prep - check if napi can be scheduled
 *	@n: napi context
 *
 * Test if NAPI routine is already running, and if not mark
 * it as running.  This is used as a condition variable
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 * insure only one NAPI poll instance runs.  We also make
 * sure there is no pending NAPI disable.
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 */
static inline int napi_schedule_prep(struct napi_struct *n)
{
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	return !napi_disable_pending(n) &&
		!test_and_set_bit(NAPI_STATE_SCHED, &n->state);
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}

/**
 *	napi_schedule - schedule NAPI poll
 *	@n: napi context
 *
 * Schedule NAPI poll routine to be called if it is not already
 * running.
 */
static inline void napi_schedule(struct napi_struct *n)
{
	if (napi_schedule_prep(n))
		__napi_schedule(n);
}

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/* Try to reschedule poll. Called by dev->poll() after napi_complete().  */
static inline int napi_reschedule(struct napi_struct *napi)
{
	if (napi_schedule_prep(napi)) {
		__napi_schedule(napi);
		return 1;
	}
	return 0;
}

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/**
 *	napi_complete - NAPI processing complete
 *	@n: napi context
 *
 * Mark NAPI processing as complete.
 */
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extern void __napi_complete(struct napi_struct *n);
extern void napi_complete(struct napi_struct *n);
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/**
 *	napi_disable - prevent NAPI from scheduling
 *	@n: napi context
 *
 * Stop NAPI from being scheduled on this context.
 * Waits till any outstanding processing completes.
 */
static inline void napi_disable(struct napi_struct *n)
{
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	set_bit(NAPI_STATE_DISABLE, &n->state);
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	while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
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		msleep(1);
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	clear_bit(NAPI_STATE_DISABLE, &n->state);
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}

/**
 *	napi_enable - enable NAPI scheduling
 *	@n: napi context
 *
 * Resume NAPI from being scheduled on this context.
 * Must be paired with napi_disable.
 */
static inline void napi_enable(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	smp_mb__before_clear_bit();
	clear_bit(NAPI_STATE_SCHED, &n->state);
}

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#ifdef CONFIG_SMP
/**
 *	napi_synchronize - wait until NAPI is not running
 *	@n: napi context
 *
 * Wait until NAPI is done being scheduled on this context.
 * Waits till any outstanding processing completes but
 * does not disable future activations.
 */
static inline void napi_synchronize(const struct napi_struct *n)
{
	while (test_bit(NAPI_STATE_SCHED, &n->state))
		msleep(1);
}
#else
# define napi_synchronize(n)	barrier()
#endif

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enum netdev_queue_state_t {
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	__QUEUE_STATE_XOFF,
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	__QUEUE_STATE_FROZEN,
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};

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struct netdev_queue {
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/*
 * read mostly part
 */
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	struct net_device	*dev;
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	struct Qdisc		*qdisc;
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	unsigned long		state;
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	struct Qdisc		*qdisc_sleeping;
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/*
 * write mostly part
 */
	spinlock_t		_xmit_lock ____cacheline_aligned_in_smp;
	int			xmit_lock_owner;
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	/*
	 * please use this field instead of dev->trans_start
	 */
	unsigned long		trans_start;
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	u64			tx_bytes;
	u64			tx_packets;
	u64			tx_dropped;
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} ____cacheline_aligned_in_smp;
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#ifdef CONFIG_RPS
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/*
 * This structure holds an RPS map which can be of variable length.  The
 * map is an array of CPUs.
 */
struct rps_map {
	unsigned int len;
	struct rcu_head rcu;
	u16 cpus[0];
};
#define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + (_num * sizeof(u16)))

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

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

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

#define RPS_NO_CPU 0xffff

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

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

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

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

extern struct rps_sock_flow_table *rps_sock_flow_table;

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/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
	struct rps_map *rps_map;
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	struct rps_dev_flow_table *rps_flow_table;
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	struct kobject kobj;
	struct netdev_rx_queue *first;
	atomic_t count;
} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
593 594 595

/*
 * This structure defines the management hooks for network devices.
596 597
 * The following hooks can be defined; unless noted otherwise, they are
 * optional and can be filled with a null pointer.
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
 *
 * 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.
 *
617 618
 * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
 *                               struct net_device *dev);
619
 *	Called when a packet needs to be transmitted.
620 621
 *	Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
 *        (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
622 623 624 625 626 627
 *	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.
 *
628 629 630 631 632 633 634 635 636 637 638 639
 * 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
640
 *	needs to be changed. If this interface is not defined, the
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 *	mac address can not be changed.
 *
 * int (*ndo_validate_addr)(struct net_device *dev);
 *	Test if Media Access Control address is valid for the device.
 *
 * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
 *	Called when a user request an ioctl which can't be handled by
 *	the generic interface code. If not defined ioctl's return
 *	not supported error code.
 *
 * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
 *	Used to set network devices bus interface parameters. This interface
 *	is retained for legacy reason, new devices should use the bus
 *	interface (PCI) for low level management.
 *
 * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
 *	Called when a user wants to change the Maximum Transfer Unit
 *	of a device. If not defined, any request to change MTU will
 *	will return an error.
 *
661
 * void (*ndo_tx_timeout)(struct net_device *dev);
662 663 664
 *	Callback uses when the transmitter has not made any progress
 *	for dev->watchdog ticks.
 *
665
 * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
666
 *                      struct rtnl_link_stats64 *storage);
667
 * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
668
 *	Called when a user wants to get the network device usage
669
 *	statistics. Drivers must do one of the following:
670 671
 *	1. Define @ndo_get_stats64 to fill in a zero-initialised
 *	   rtnl_link_stats64 structure passed by the caller.
672
 *	2. Define @ndo_get_stats to update a net_device_stats structure
673 674 675 676 677
 *	   (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.
678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693
 *
 * void (*ndo_vlan_rx_register)(struct net_device *dev, struct vlan_group *grp);
 *	If device support VLAN receive accleration
 *	(ie. dev->features & NETIF_F_HW_VLAN_RX), then this function is called
 *	when vlan groups for the device changes.  Note: grp is NULL
 *	if no vlan's groups are being used.
 *
 * void (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is registered.
 *
 * void (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
 *	If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
 *	this function is called when a VLAN id is unregistered.
 *
 * void (*ndo_poll_controller)(struct net_device *dev);
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 *
 *	SR-IOV management functions.
 * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
 * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
 * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
 * int (*ndo_get_vf_config)(struct net_device *dev,
 *			    int vf, struct ifla_vf_info *ivf);
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 * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
 *			  struct nlattr *port[]);
 * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
704
 */
705
#define HAVE_NET_DEVICE_OPS
706 707 708 709 710
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);
711
	netdev_tx_t		(*ndo_start_xmit) (struct sk_buff *skb,
712 713 714
						   struct net_device *dev);
	u16			(*ndo_select_queue)(struct net_device *dev,
						    struct sk_buff *skb);
715 716 717 718 719 720 721 722 723 724 725
	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);
726 727 728 729
	int			(*ndo_change_mtu)(struct net_device *dev,
						  int new_mtu);
	int			(*ndo_neigh_setup)(struct net_device *dev,
						   struct neigh_parms *);
730 731
	void			(*ndo_tx_timeout) (struct net_device *dev);

732 733
	struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
						     struct rtnl_link_stats64 *storage);
734 735 736 737 738 739 740 741 742 743
	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);
746
	void			(*ndo_netpoll_cleanup)(struct net_device *dev);
747
#endif
748 749 750 751 752 753 754 755 756
	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);
757 758 759 760 761
	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);
762
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
763 764
	int			(*ndo_fcoe_enable)(struct net_device *dev);
	int			(*ndo_fcoe_disable)(struct net_device *dev);
765 766 767 768 769 770
	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);
771 772 773 774
#define NETDEV_FCOE_WWNN 0
#define NETDEV_FCOE_WWPN 1
	int			(*ndo_fcoe_get_wwn)(struct net_device *dev,
						    u64 *wwn, int type);
775
#endif
776 777
};

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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
793
	 * of the interface.
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	 */
	char			name[IFNAMSIZ];
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797
	struct pm_qos_request_list pm_qos_req;
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799 800
	/* device name hash chain */
	struct hlist_node	name_hlist;
801 802
	/* 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;

823
	struct list_head	dev_list;
824
	struct list_head	napi_list;
825
	struct list_head	unreg_list;
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827 828 829
	/* Net device features */
	unsigned long		features;
#define NETIF_F_SG		1	/* Scatter/gather IO. */
830
#define NETIF_F_IP_CSUM		2	/* Can checksum TCP/UDP over IPv4. */
831 832
#define NETIF_F_NO_CSUM		4	/* Does not require checksum. F.e. loopack. */
#define NETIF_F_HW_CSUM		8	/* Can checksum all the packets. */
833
#define NETIF_F_IPV6_CSUM	16	/* Can checksum TCP/UDP over IPV6 */
834 835 836 837 838 839
#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. */
841 842
#define NETIF_F_LLTX		4096	/* LockLess TX - deprecated. Please */
					/* do not use LLTX in new drivers */
843
#define NETIF_F_NETNS_LOCAL	8192	/* Does not change network namespaces */
844
#define NETIF_F_GRO		16384	/* Generic receive offload */
845
#define NETIF_F_LRO		32768	/* large receive offload */
846

847
/* the GSO_MASK reserves bits 16 through 23 */
848
#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
849
#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
850
#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
851
#define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
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#define NETIF_F_RXHASH		(1 << 28) /* Receive hashing offload */
853

854
	/* Segmentation offload features */
855
#define NETIF_F_GSO_SHIFT	16
856
#define NETIF_F_GSO_MASK	0x00ff0000
857
#define NETIF_F_TSO		(SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
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#define NETIF_F_UFO		(SKB_GSO_UDP << NETIF_F_GSO_SHIFT)
859
#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)
862
#define NETIF_F_FSO		(SKB_GSO_FCOE << NETIF_F_GSO_SHIFT)
863

864
	/* List of features with software fallbacks. */
865 866
#define NETIF_F_GSO_SOFTWARE	(NETIF_F_TSO | NETIF_F_TSO_ECN | \
				 NETIF_F_TSO6 | NETIF_F_UFO)
867

868

869
#define NETIF_F_GEN_CSUM	(NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
870 871 872
#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)
873

874 875 876 877 878
	/*
	 * 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 | \
879
				 NETIF_F_SG | NETIF_F_HIGHDMA |		\
880 881
				 NETIF_F_FRAGLIST)

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

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	struct net_device_stats	stats;
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888
#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;
894
#endif
895 896
	/* Management operations */
	const struct net_device_ops *netdev_ops;
897
	const struct ethtool_ops *ethtool_ops;
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899 900 901
	/* Hardware header description */
	const struct header_ops *header_ops;

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	unsigned int		flags;	/* interface flags (a la BSD)	*/
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	unsigned short		gflags;
904
        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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	unsigned char		operstate; /* RFC2863 operstate */
	unsigned char		link_mode; /* mapping policy to operstate */

910
	unsigned int		mtu;	/* interface MTU value		*/
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	unsigned short		type;	/* interface hardware type	*/
	unsigned short		hard_header_len;	/* hardware hdr length	*/

914 915 916 917 918 919 920
	/* 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. */
922
	unsigned char		perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
923
	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;
928 929 930
	struct netdev_hw_addr_list	uc;	/* Unicast mac addresses */
	struct netdev_hw_addr_list	mc;	/* Multicast mac addresses */
	int			uc_promisc;
931 932
	unsigned int		promiscuity;
	unsigned int		allmulti;
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	/* Protocol specific pointers */
	
937 938 939
#ifdef CONFIG_NET_DSA
	void			*dsa_ptr;	/* dsa specific data */
#endif
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	void 			*atalk_ptr;	/* AppleTalk link 	*/
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	struct in_device __rcu	*ip_ptr;	/* IPv4 specific data	*/
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	void                    *dn_ptr;        /* DECnet specific data */
	void                    *ip6_ptr;       /* IPv6 specific data */
	void			*ec_ptr;	/* Econet specific data	*/
	void			*ax25_ptr;	/* AX.25 specific data */
946 947
	struct wireless_dev	*ieee80211_ptr;	/* IEEE 802.11 specific data,
						   assign before registering */
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949
/*
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 * Cache lines mostly used on receive path (including eth_type_trans())
951
 */
952 953 954 955 956 957 958 959
	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.
					  */

964
	/* Interface address info used in eth_type_trans() */
965 966 967 968
	unsigned char		*dev_addr;	/* hw address, (before bcast
						   because most packets are
						   unicast) */

969 970
	struct netdev_hw_addr_list	dev_addrs; /* list of device
						      hw addresses */
971 972

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

	struct netdev_rx_queue	*_rx;

979
	/* Number of RX queues allocated at register_netdev() time */
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	unsigned int		num_rx_queues;
981 982 983

	/* Number of RX queues currently active in device */
	unsigned int		real_num_rx_queues;
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#endif
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986
	rx_handler_func_t	*rx_handler;
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	void			*rx_handler_data;
988

989
	struct netdev_queue	ingress_queue; /* use two cache lines */
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/*
 * Cache lines mostly used on transmit path
 */
994
	struct netdev_queue	*_tx ____cacheline_aligned_in_smp;
995 996

	/* Number of TX queues allocated at alloc_netdev_mq() time  */
997
	unsigned int		num_tx_queues;
998 999 1000 1001

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

1002 1003 1004
	/* root qdisc from userspace point of view */
	struct Qdisc		*qdisc;

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	unsigned long		tx_queue_len;	/* Max frames per queue allowed */
1006
	spinlock_t		tx_global_lock;
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1008
	/* These may be needed for future network-power-down code. */
1009 1010 1011 1012 1013

	/*
	 * trans_start here is expensive for high speed devices on SMP,
	 * please use netdev_queue->trans_start instead.
	 */
1014 1015 1016 1017 1018
	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 */
1020 1021
	atomic_t		refcnt ____cacheline_aligned_in_smp;

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

1027
	struct list_head	link_watch_list;
1028

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	/* register/unregister state machine */
	enum { NETREG_UNINITIALIZED=0,
1031
	       NETREG_REGISTERED,	/* completed register_netdevice */
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	       NETREG_UNREGISTERING,	/* called unregister_netdevice */
	       NETREG_UNREGISTERED,	/* completed unregister todo */
	       NETREG_RELEASED,		/* called free_netdev */
1035
	       NETREG_DUMMY,		/* dummy device for NAPI poll */
1036 1037 1038 1039 1040 1041
	} reg_state:16;

	enum {
		RTNL_LINK_INITIALIZED,
		RTNL_LINK_INITIALIZING,
	} rtnl_link_state:16;
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1043 1044
	/* Called from unregister, can be used to call free_netdev */
	void (*destructor)(struct net_device *dev);
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#ifdef CONFIG_NETPOLL
1047
	struct netpoll_info	*npinfo;
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#endif
1049

1050
#ifdef CONFIG_NET_NS
1051 1052
	/* Network namespace this network device is inside */
	struct net		*nd_net;
1053
#endif
1054

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	/* mid-layer private */
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1056 1057 1058
	union {
		void				*ml_priv;
		struct pcpu_lstats __percpu	*lstats; /* loopback stats */
1059
		struct pcpu_tstats __percpu	*tstats; /* tunnel stats */
1060
		struct pcpu_dstats __percpu	*dstats; /* dummy stats */
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1061
	};
1062 1063
	/* GARP */
	struct garp_port	*garp_port;
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1064 1065

	/* class/net/name entry */
1066
	struct device		dev;
1067 1068
	/* space for optional device, statistics, and wireless sysfs groups */
	const struct attribute_group *sysfs_groups[4];
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1069 1070 1071

	/* rtnetlink link ops */
	const struct rtnl_link_ops *rtnl_link_ops;
1072

1073 1074 1075
	/* VLAN feature mask */
	unsigned long vlan_features;

1076 1077 1078
	/* for setting kernel sock attribute on TCP connection setup */
#define GSO_MAX_SIZE		65536
	unsigned int		gso_max_size;
1079

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#ifdef CONFIG_DCB
1081
	/* Data Center Bridging netlink ops */
1082
	const struct dcbnl_rtnl_ops *dcbnl_ops;
1083 1084
#endif

1085 1086 1087 1088
#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
	/* max exchange id for FCoE LRO by ddp */
	unsigned int		fcoe_ddp_xid;
#endif
1089 1090
	/* n-tuple filter list attached to this device */
	struct ethtool_rx_ntuple_list ethtool_ntuple_list;
1091 1092 1093

	/* phy device may attach itself for hardware timestamping */
	struct phy_device *phydev;
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};
1095
#define to_net_dev(d) container_of(d, struct net_device, dev)
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#define	NETDEV_ALIGN		32

1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
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);
}

1118 1119 1120 1121 1122 1123
/*
 * Net namespace inlines
 */
static inline
struct net *dev_net(const struct net_device *dev)
{
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	return read_pnet(&dev->nd_net);
1125 1126 1127
}

static inline
1128
void dev_net_set(struct net_device *dev, struct net *net)
1129 1130
{
#ifdef CONFIG_NET_NS
1131 1132
	release_net(dev->nd_net);
	dev->nd_net = hold_net(net);
1133 1134 1135
#endif
}

1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
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;
}

1146 1147 1148 1149 1150 1151 1152 1153 1154
#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

1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
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;
}

1165 1166 1167 1168 1169 1170
/**
 *	netdev_priv - access network device private data
 *	@dev: network device
 *
 * Get network device private data
 */
1171
static inline void *netdev_priv(const struct net_device *dev)
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{
1173
	return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
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1174 1175 1176 1177 1178
}

/* Set the sysfs physical device reference for the network logical device
 * if set prior to registration will cause a symlink during initialization.
 */
1179
#define SET_NETDEV_DEV(net, pdev)	((net)->dev.parent = (pdev))
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1181 1182 1183 1184 1185 1186
/* 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))

1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
/**
 *	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.
 */
1197 1198
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight);
1199

1200 1201 1202 1203 1204 1205
/**
 *  netif_napi_del - remove a napi context
 *  @napi: napi context
 *
 *  netif_napi_del() removes a napi context from the network device napi list
 */
1206 1207 1208
void netif_napi_del(struct napi_struct *napi);

struct napi_gro_cb {
1209 1210 1211
	/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
	void *frag0;

1212 1213 1214
	/* Length of frag0. */
	unsigned int frag0_len;

1215 1216 1217
	/* This indicates where we are processing relative to skb->data. */
	int data_offset;

1218 1219 1220 1221 1222 1223 1224 1225
	/* 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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1226 1227 1228

	/* Free the skb? */
	int free;
1229 1230 1231
};

#define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
1232

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struct packet_type {
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1234 1235 1236 1237 1238 1239
	__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 *);
1240 1241
	struct sk_buff		*(*gso_segment)(struct sk_buff *skb,
						int features);
1242
	int			(*gso_send_check)(struct sk_buff *skb);
1243 1244 1245
	struct sk_buff		**(*gro_receive)(struct sk_buff **head,
					       struct sk_buff *skb);
	int			(*gro_complete)(struct sk_buff *skb);
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1246 1247 1248 1249 1250 1251 1252 1253 1254
	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 */

1255

1256 1257
#define for_each_netdev(net, d)		\
		list_for_each_entry(d, &(net)->dev_base_head, dev_list)
1258 1259
#define for_each_netdev_reverse(net, d)	\
		list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
1260 1261
#define for_each_netdev_rcu(net, d)		\
		list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
1262 1263 1264 1265
#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)
1266 1267
#define for_each_netdev_continue_rcu(net, d)		\
	list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
1268
#define net_device_entry(lh)	list_entry(lh, struct net_device, dev_list)
1269

1270 1271 1272 1273 1274
static inline struct net_device *next_net_device(struct net_device *dev)
{
	struct list_head *lh;
	struct net *net;

1275
	net = dev_net(dev);
1276 1277 1278 1279
	lh = dev->dev_list.next;
	return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
}

1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
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);
}

1290 1291 1292 1293 1294
static inline struct net_device *first_net_device(struct net *net)
{
	return list_empty(&net->dev_base_head) ? NULL :
		net_device_entry(net->dev_base_head.next);
}
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extern int 			netdev_boot_setup_check(struct net_device *dev);
extern unsigned long		netdev_boot_base(const char *prefix, int unit);
1298 1299 1300
extern struct net_device    *dev_getbyhwaddr(struct net *net, unsigned short type, char *hwaddr);
extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
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extern void		dev_add_pack(struct packet_type *pt);
extern void		dev_remove_pack(struct packet_type *pt);
extern void		__dev_remove_pack(struct packet_type *pt);

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extern struct net_device	*dev_get_by_flags_rcu(struct net *net, unsigned short flags,
						      unsigned short mask);
1307
extern struct net_device	*dev_get_by_name(struct net *net, const char *name);
1308
extern struct net_device	*dev_get_by_name_rcu(struct net *net, const char *name);
1309
extern struct net_device	*__dev_get_by_name(struct net *net, const char *name);
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extern int		dev_alloc_name(struct net_device *dev, const char *name);
extern int		dev_open(struct net_device *dev);
extern int		dev_close(struct net_device *dev);
1313
extern void		dev_disable_lro(struct net_device *dev);
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extern int		dev_queue_xmit(struct sk_buff *skb);
extern int		register_netdevice(struct net_device *dev);
1316 1317
extern void		unregister_netdevice_queue(struct net_device *dev,
						   struct list_head *head);
1318
extern void		unregister_netdevice_many(struct list_head *head);
1319 1320 1321 1322 1323
static inline void unregister_netdevice(struct net_device *dev)
{
	unregister_netdevice_queue(dev, NULL);
}

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extern void		free_netdev(struct net_device *dev);
extern void		synchronize_net(void);
extern int 		register_netdevice_notifier(struct notifier_block *nb);
extern int		unregister_netdevice_notifier(struct notifier_block *nb);
1328
extern int		init_dummy_netdev(struct net_device *dev);
1329
extern void		netdev_resync_ops(struct net_device *dev);
1330

1331
extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
1332 1333
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);
1334
extern struct net_device	*dev_get_by_index_rcu(struct net *net, int ifindex);
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extern int		dev_restart(struct net_device *dev);
#ifdef CONFIG_NETPOLL_TRAP
extern int		netpoll_trap(void);
#endif
1339 1340
extern int	       skb_gro_receive(struct sk_buff **head,
				       struct sk_buff *skb);
1341
extern void	       skb_gro_reset_offset(struct sk_buff *skb);
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357

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;
}

1358 1359
static inline void *skb_gro_header_fast(struct sk_buff *skb,
					unsigned int offset)
1360
{
1361 1362
	return NAPI_GRO_CB(skb)->frag0 + offset;
}
1363

1364 1365 1366 1367
static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
{
	return NAPI_GRO_CB(skb)->frag0_len < hlen;
}
1368

1369 1370 1371 1372 1373 1374
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;
1375
}
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1377 1378
static inline void *skb_gro_mac_header(struct sk_buff *skb)
{
1379
	return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
1380 1381
}

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1382 1383
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
1384 1385
	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
	       skb_network_offset(skb);
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1386 1387
}

1388 1389
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
				  unsigned short type,
1390 1391
				  const void *daddr, const void *saddr,
				  unsigned len)
1392
{
1393
	if (!dev->header_ops || !dev->header_ops->create)
1394
		return 0;
1395 1396

	return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
1397 1398
}

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1399 1400 1401 1402 1403
static inline int dev_parse_header(const struct sk_buff *skb,
				   unsigned char *haddr)
{
	const struct net_device *dev = skb->dev;

1404
	if (!dev->header_ops || !dev->header_ops->parse)
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Stephen Hemminger 已提交
1405
		return 0;
1406
	return dev->header_ops->parse(skb, haddr);
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1407 1408
}

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typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
extern int		register_gifconf(unsigned int family, gifconf_func_t * gifconf);
static inline int unregister_gifconf(unsigned int family)
{
	return register_gifconf(family, NULL);
}

/*
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 * Incoming packets are placed on per-cpu queues
L
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1418
 */
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1419
struct softnet_data {
1420
	struct Qdisc		*output_queue;
1421
	struct Qdisc		**output_queue_tailp;
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1422 1423
	struct list_head	poll_list;
	struct sk_buff		*completion_queue;
1424
	struct sk_buff_head	process_queue;
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1425

C
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1426
	/* stats */
1427 1428 1429 1430
	unsigned int		processed;
	unsigned int		time_squeeze;
	unsigned int		cpu_collision;
	unsigned int		received_rps;
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1432
#ifdef CONFIG_RPS
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1433 1434 1435
	struct softnet_data	*rps_ipi_list;

	/* Elements below can be accessed between CPUs for RPS */
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1436
	struct call_single_data	csd ____cacheline_aligned_in_smp;
E
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1437 1438
	struct softnet_data	*rps_ipi_next;
	unsigned int		cpu;
T
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1439
	unsigned int		input_queue_head;
1440
	unsigned int		input_queue_tail;
1441
#endif
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1442
	unsigned		dropped;
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1443
	struct sk_buff_head	input_pkt_queue;
1444
	struct napi_struct	backlog;
L
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1445 1446
};

1447
static inline void input_queue_head_incr(struct softnet_data *sd)
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1448 1449
{
#ifdef CONFIG_RPS
1450 1451 1452 1453 1454 1455 1456 1457 1458
	sd->input_queue_head++;
#endif
}

static inline void input_queue_tail_incr_save(struct softnet_data *sd,
					      unsigned int *qtail)
{
#ifdef CONFIG_RPS
	*qtail = ++sd->input_queue_tail;
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1459 1460 1461
#endif
}

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1462
DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
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1463 1464 1465

#define HAVE_NETIF_QUEUE

1466
extern void __netif_schedule(struct Qdisc *q);
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1467

1468
static inline void netif_schedule_queue(struct netdev_queue *txq)
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1469
{
1470
	if (!test_bit(__QUEUE_STATE_XOFF, &txq->state))
1471
		__netif_schedule(txq->qdisc);
1472 1473
}

1474 1475 1476 1477 1478 1479 1480 1481
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));
}

1482 1483 1484 1485 1486
static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
{
	clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1487 1488 1489 1490 1491 1492
/**
 *	netif_start_queue - allow transmit
 *	@dev: network device
 *
 *	Allow upper layers to call the device hard_start_xmit routine.
 */
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static inline void netif_start_queue(struct net_device *dev)
{
1495
	netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
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1496 1497
}

1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
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);
	}
}

1508
static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
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1509 1510
{
#ifdef CONFIG_NETPOLL_TRAP
1511
	if (netpoll_trap()) {
1512
		netif_tx_start_queue(dev_queue);
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1513
		return;
1514
	}
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1515
#endif
1516
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
1517
		__netif_schedule(dev_queue->qdisc);
1518 1519
}

1520 1521 1522 1523 1524 1525 1526
/**
 *	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.
 */
1527 1528
static inline void netif_wake_queue(struct net_device *dev)
{
1529
	netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
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}

1532 1533 1534 1535 1536 1537 1538 1539 1540 1541
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);
	}
}

1542 1543 1544 1545 1546
static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
{
	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1547 1548 1549 1550 1551 1552 1553
/**
 *	netif_stop_queue - stop transmitted packets
 *	@dev: network device
 *
 *	Stop upper layers calling the device hard_start_xmit routine.
 *	Used for flow control when transmit resources are unavailable.
 */
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static inline void netif_stop_queue(struct net_device *dev)
{
1556
	netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
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}

1559 1560 1561 1562 1563 1564 1565 1566 1567 1568
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);
	}
}

1569 1570 1571 1572 1573
static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
}

1574 1575 1576 1577 1578 1579
/**
 *	netif_queue_stopped - test if transmit queue is flowblocked
 *	@dev: network device
 *
 *	Test if transmit queue on device is currently unable to send.
 */
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static inline int netif_queue_stopped(const struct net_device *dev)
{
1582
	return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
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}

1585 1586 1587 1588 1589
static inline int netif_tx_queue_frozen(const struct netdev_queue *dev_queue)
{
	return test_bit(__QUEUE_STATE_FROZEN, &dev_queue->state);
}

1590 1591 1592 1593 1594 1595
/**
 *	netif_running - test if up
 *	@dev: network device
 *
 *	Test if the device has been brought up.
 */
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static inline int netif_running(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_START, &dev->state);
}

1601 1602 1603 1604 1605 1606
/*
 * 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.
 */
1607 1608 1609 1610 1611 1612 1613 1614

/**
 *	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.
 */
1615 1616
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
1617
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1618 1619

	netif_tx_start_queue(txq);
1620 1621
}

1622 1623 1624 1625 1626 1627 1628
/**
 *	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.
 */
1629 1630
static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
{
1631
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1632 1633 1634 1635
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1636
	netif_tx_stop_queue(txq);
1637 1638
}

1639 1640 1641 1642 1643 1644 1645
/**
 *	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.
 */
1646
static inline int __netif_subqueue_stopped(const struct net_device *dev,
1647 1648
					 u16 queue_index)
{
1649
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1650 1651

	return netif_tx_queue_stopped(txq);
1652 1653
}

1654 1655 1656 1657 1658
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));
}
1659 1660 1661 1662 1663 1664 1665 1666

/**
 *	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.
 */
1667 1668
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
1669
	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
1670 1671 1672 1673
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
1674
	if (test_and_clear_bit(__QUEUE_STATE_XOFF, &txq->state))
1675
		__netif_schedule(txq->qdisc);
1676 1677
}

1678 1679 1680 1681 1682 1683
/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 */
1684 1685
static inline int netif_is_multiqueue(const struct net_device *dev)
{
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	return dev->num_tx_queues > 1;
1687
}
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1689 1690 1691
extern void netif_set_real_num_tx_queues(struct net_device *dev,
					 unsigned int txq);

1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
#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

1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
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
}

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/* Use this variant when it is known for sure that it
1716 1717
 * is executing from hardware interrupt context or with hardware interrupts
 * disabled.
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1718
 */
1719
extern void dev_kfree_skb_irq(struct sk_buff *skb);
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1720 1721

/* Use this variant in places where it could be invoked
1722 1723
 * from either hardware interrupt or other context, with hardware interrupts
 * either disabled or enabled.
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1724
 */
1725
extern void dev_kfree_skb_any(struct sk_buff *skb);
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1726 1727 1728 1729 1730 1731

#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);
1732
extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
1733
					struct sk_buff *skb);
1734 1735
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,
1736
					 struct sk_buff *skb);
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1737
extern void		napi_gro_flush(struct napi_struct *napi);
1738 1739
extern void		napi_reuse_skb(struct napi_struct *napi,
				       struct sk_buff *skb);
1740
extern struct sk_buff *	napi_get_frags(struct napi_struct *napi);
1741
extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
1742 1743
					  struct sk_buff *skb,
					  gro_result_t ret);
1744
extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
1745
extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
1746 1747 1748 1749 1750 1751 1752

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

1753
extern int netdev_rx_handler_register(struct net_device *dev,
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				      rx_handler_func_t *rx_handler,
				      void *rx_handler_data);
1756 1757
extern void netdev_rx_handler_unregister(struct net_device *dev);

1758
extern void		netif_nit_deliver(struct sk_buff *skb);
1759
extern int		dev_valid_name(const char *name);
1760 1761
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
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extern unsigned		dev_get_flags(const struct net_device *);
1763
extern int		__dev_change_flags(struct net_device *, unsigned int flags);
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extern int		dev_change_flags(struct net_device *, unsigned);
1765
extern void		__dev_notify_flags(struct net_device *, unsigned int old_flags);
1766
extern int		dev_change_name(struct net_device *, const char *);
1767
extern int		dev_set_alias(struct net_device *, const char *, size_t);
1768 1769
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
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extern int		dev_set_mtu(struct net_device *, int);
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
1773
extern int		dev_hard_start_xmit(struct sk_buff *skb,
1774 1775
					    struct net_device *dev,
					    struct netdev_queue *txq);
1776 1777
extern int		dev_forward_skb(struct net_device *dev,
					struct sk_buff *skb);
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1779
extern int		netdev_budget;
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/* Called by rtnetlink.c:rtnl_unlock() */
extern void netdev_run_todo(void);

1784 1785 1786 1787
/**
 *	dev_put - release reference to device
 *	@dev: network device
 *
1788
 * Release reference to device to allow it to be freed.
1789
 */
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static inline void dev_put(struct net_device *dev)
{
	atomic_dec(&dev->refcnt);
}

1795 1796 1797 1798
/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
1799
 * Hold reference to device to keep it from being freed.
1800
 */
1801 1802 1803 1804
static inline void dev_hold(struct net_device *dev)
{
	atomic_inc(&dev->refcnt);
}
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/* Carrier loss detection, dial on demand. The functions netif_carrier_on
 * and _off may be called from IRQ context, but it is caller
 * who is responsible for serialization of these calls.
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 *
 * The name carrier is inappropriate, these functions should really be
 * called netif_lowerlayer_*() because they represent the state of any
 * kind of lower layer not just hardware media.
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 */

extern void linkwatch_fire_event(struct net_device *dev);
1816
extern void linkwatch_forget_dev(struct net_device *dev);
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1818 1819 1820 1821 1822 1823
/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

1829 1830
extern unsigned long dev_trans_start(struct net_device *dev);

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extern void __netdev_watchdog_up(struct net_device *dev);

1833
extern void netif_carrier_on(struct net_device *dev);
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1834

1835
extern void netif_carrier_off(struct net_device *dev);
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1837 1838
extern void netif_notify_peers(struct net_device *dev);

1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851
/**
 *	netif_dormant_on - mark device as dormant.
 *	@dev: network device
 *
 * Mark device as dormant (as per RFC2863).
 *
 * The dormant state indicates that the relevant interface is not
 * actually in a condition to pass packets (i.e., it is not 'up') but is
 * in a "pending" state, waiting for some external event.  For "on-
 * demand" interfaces, this new state identifies the situation where the
 * interface is waiting for events to place it in the up state.
 *
 */
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1852 1853 1854 1855 1856 1857
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1858 1859 1860 1861 1862 1863
/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
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1864 1865 1866 1867 1868 1869
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

1870 1871 1872 1873 1874 1875
/**
 *	netif_dormant - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
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1876 1877 1878 1879 1880 1881
static inline int netif_dormant(const struct net_device *dev)
{
	return test_bit(__LINK_STATE_DORMANT, &dev->state);
}


1882 1883 1884 1885 1886 1887
/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
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1888 1889
static inline int netif_oper_up(const struct net_device *dev)
{
S
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1890 1891 1892 1893
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

1894 1895 1896 1897 1898 1899
/**
 *	netif_device_present - is device available or removed
 *	@dev: network device
 *
 * Check if device has not been removed from system.
 */
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static inline int netif_device_present(struct net_device *dev)
{
	return test_bit(__LINK_STATE_PRESENT, &dev->state);
}

1905
extern void netif_device_detach(struct net_device *dev);
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1907
extern void netif_device_attach(struct net_device *dev);
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/*
 * Network interface message level settings
 */
#define HAVE_NETIF_MSG 1

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

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

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

1959
static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
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1960
{
1961 1962
	spin_lock(&txq->_xmit_lock);
	txq->xmit_lock_owner = cpu;
1963 1964
}

1965 1966 1967 1968 1969 1970
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
	spin_lock_bh(&txq->_xmit_lock);
	txq->xmit_lock_owner = smp_processor_id();
}

1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
static inline int __netif_tx_trylock(struct netdev_queue *txq)
{
	int ok = spin_trylock(&txq->_xmit_lock);
	if (likely(ok))
		txq->xmit_lock_owner = smp_processor_id();
	return ok;
}

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

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

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1991 1992 1993 1994 1995 1996
static inline void txq_trans_update(struct netdev_queue *txq)
{
	if (txq->xmit_lock_owner != -1)
		txq->trans_start = jiffies;
}

1997 1998 1999 2000 2001 2002
/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *
 * Get network device transmit lock
 */
2003 2004
static inline void netif_tx_lock(struct net_device *dev)
{
2005
	unsigned int i;
2006
	int cpu;
2007

2008 2009
	spin_lock(&dev->tx_global_lock);
	cpu = smp_processor_id();
2010 2011
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2012 2013 2014 2015 2016 2017 2018

		/* 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.
		 */
2019
		__netif_tx_lock(txq, cpu);
2020 2021
		set_bit(__QUEUE_STATE_FROZEN, &txq->state);
		__netif_tx_unlock(txq);
2022
	}
H
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2023 2024 2025 2026
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
2027 2028
	local_bh_disable();
	netif_tx_lock(dev);
H
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2029 2030 2031 2032
}

static inline void netif_tx_unlock(struct net_device *dev)
{
2033 2034 2035 2036
	unsigned int i;

	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2037

2038 2039 2040 2041 2042
		/* 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);
2043
		netif_schedule_queue(txq);
2044 2045
	}
	spin_unlock(&dev->tx_global_lock);
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2046 2047 2048 2049
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
2050 2051
	netif_tx_unlock(dev);
	local_bh_enable();
H
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2052 2053
}

2054
#define HARD_TX_LOCK(dev, txq, cpu) {			\
2055
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2056
		__netif_tx_lock(txq, cpu);		\
2057 2058 2059
	}						\
}

2060
#define HARD_TX_UNLOCK(dev, txq) {			\
2061
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
2062
		__netif_tx_unlock(txq);			\
2063 2064 2065
	}						\
}

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2066 2067
static inline void netif_tx_disable(struct net_device *dev)
{
2068
	unsigned int i;
2069
	int cpu;
2070

2071 2072
	local_bh_disable();
	cpu = smp_processor_id();
2073 2074
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
2075 2076

		__netif_tx_lock(txq, cpu);
2077
		netif_tx_stop_queue(txq);
2078
		__netif_tx_unlock(txq);
2079
	}
2080
	local_bh_enable();
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}

2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102
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);
}

2103
/*
2104
 * dev_addrs walker. Should be used only for read access. Call with
2105 2106 2107
 * rcu_read_lock held.
 */
#define for_each_dev_addr(dev, ha) \
2108
		list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
2109

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2110 2111 2112 2113 2114
/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
2115 2116 2117 2118 2119
extern struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
				       void (*setup)(struct net_device *),
				       unsigned int queue_count);
#define alloc_netdev(sizeof_priv, name, setup) \
	alloc_netdev_mq(sizeof_priv, name, setup, 1)
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extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
2122

2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138
/* 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);

2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
/* 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);
2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
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);
2160

2161 2162 2163 2164 2165 2166 2167 2168 2169
/* 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);
2170

2171 2172 2173
/* 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);
2174 2175
extern int		dev_set_promiscuity(struct net_device *dev, int inc);
extern int		dev_set_allmulti(struct net_device *dev, int inc);
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extern void		netdev_state_change(struct net_device *dev);
2177
extern int		netdev_bonding_change(struct net_device *dev,
2178
					      unsigned long event);
2179
extern void		netdev_features_change(struct net_device *dev);
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2180
/* Load a device via the kmod */
2181
extern void		dev_load(struct net *net, const char *name);
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2182
extern void		dev_mcast_init(void);
2183 2184
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					       struct rtnl_link_stats64 *storage);
2185
extern void		dev_txq_stats_fold(const struct net_device *dev,
2186
					   struct rtnl_link_stats64 *stats);
2187

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2188
extern int		netdev_max_backlog;
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2189
extern int		netdev_tstamp_prequeue;
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2190 2191
extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
2192
extern int skb_checksum_help(struct sk_buff *skb);
2193
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
2194 2195 2196 2197 2198 2199 2200
#ifdef CONFIG_BUG
extern void netdev_rx_csum_fault(struct net_device *dev);
#else
static inline void netdev_rx_csum_fault(struct net_device *dev)
{
}
#endif
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2201 2202 2203 2204
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

2205 2206 2207 2208 2209 2210
#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

2211 2212 2213
extern int netdev_class_create_file(struct class_attribute *class_attr);
extern void netdev_class_remove_file(struct class_attribute *class_attr);

2214 2215
extern struct kobj_ns_type_operations net_ns_type_operations;

2216
extern char *netdev_drivername(const struct net_device *dev, char *buffer, int len);
2217

2218 2219
extern void linkwatch_run_queue(void);

2220 2221 2222
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);
2223

2224 2225 2226
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev);

2227
static inline int net_gso_ok(int features, int gso_type)
2228
{
2229
	int feature = gso_type << NETIF_F_GSO_SHIFT;
2230
	return (features & feature) == feature;
2231 2232
}

2233 2234
static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
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Herbert Xu 已提交
2235
	return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
2236
	       (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
2237 2238
}

2239 2240
static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
2241 2242
	return skb_is_gso(skb) &&
	       (!skb_gso_ok(skb, dev->features) ||
2243
		unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
2244 2245
}

2246 2247 2248 2249 2250 2251
static inline void netif_set_gso_max_size(struct net_device *dev,
					  unsigned int size)
{
	dev->gso_max_size = size;
}

2252 2253
extern int __skb_bond_should_drop(struct sk_buff *skb,
				  struct net_device *master);
2254

2255 2256
static inline int skb_bond_should_drop(struct sk_buff *skb,
				       struct net_device *master)
2257
{
2258 2259
	if (master)
		return __skb_bond_should_drop(skb, master);
2260 2261 2262
	return 0;
}

2263
extern struct pernet_operations __net_initdata loopback_net_ops;
2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285

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);
}
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

/* 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;
}

2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
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)));
2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353

#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);

2354 2355 2356 2357 2358 2359 2360 2361
/* 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)

2362 2363 2364 2365 2366 2367
#define netif_level(level, priv, type, dev, fmt, args...)	\
do {								\
	if (netif_msg_##type(priv))				\
		netdev_##level(dev, fmt, ##args);		\
} while (0)

2368
#define netif_emerg(priv, type, dev, fmt, args...)		\
2369
	netif_level(emerg, priv, type, dev, fmt, ##args)
2370
#define netif_alert(priv, type, dev, fmt, args...)		\
2371
	netif_level(alert, priv, type, dev, fmt, ##args)
2372
#define netif_crit(priv, type, dev, fmt, args...)		\
2373
	netif_level(crit, priv, type, dev, fmt, ##args)
2374
#define netif_err(priv, type, dev, fmt, args...)		\
2375
	netif_level(err, priv, type, dev, fmt, ##args)
2376
#define netif_warn(priv, type, dev, fmt, args...)		\
2377
	netif_level(warn, priv, type, dev, fmt, ##args)
2378
#define netif_notice(priv, type, dev, fmt, args...)		\
2379
	netif_level(notice, priv, type, dev, fmt, ##args)
2380
#define netif_info(priv, type, dev, fmt, args...)		\
2381
	netif_level(info, priv, type, dev, fmt, ##args)
2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403

#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)
2404
#define netif_vdbg	netif_dbg
2405 2406 2407 2408
#else
#define netif_vdbg(priv, type, dev, format, args...)		\
({								\
	if (0)							\
2409
		netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
2410 2411 2412
	0;							\
})
#endif
2413

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2414 2415
#endif /* __KERNEL__ */

2416
#endif	/* _LINUX_NETDEVICE_H */