netdevice.h

来自「linux 内核源代码」· C头文件 代码 · 共 1,506 行 · 第 1/3 页

#ifdef CONFIG_NETDEVICES_MULTIQUEUE
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
	set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
#endif
}

/**
 *	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.
 */
static inline int __netif_subqueue_stopped(const struct net_device *dev,
					 u16 queue_index)
{
#ifdef CONFIG_NETDEVICES_MULTIQUEUE
	return test_bit(__LINK_STATE_XOFF,
			&dev->egress_subqueue[queue_index].state);
#else
	return 0;
#endif
}

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));
}

/**
 *	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.
 */
static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
{
#ifdef CONFIG_NETDEVICES_MULTIQUEUE
#ifdef CONFIG_NETPOLL_TRAP
	if (netpoll_trap())
		return;
#endif
	if (test_and_clear_bit(__LINK_STATE_XOFF,
			       &dev->egress_subqueue[queue_index].state))
		__netif_schedule(dev);
#endif
}

/**
 *	netif_is_multiqueue - test if device has multiple transmit queues
 *	@dev: network device
 *
 * Check if device has multiple transmit queues
 * Always falls if NETDEVICE_MULTIQUEUE is not configured
 */
static inline int netif_is_multiqueue(const struct net_device *dev)
{
#ifdef CONFIG_NETDEVICES_MULTIQUEUE
	return (!!(NETIF_F_MULTI_QUEUE & dev->features));
#else
	return 0;
#endif
}

/* Use this variant when it is known for sure that it
 * is executing from interrupt context.
 */
extern void dev_kfree_skb_irq(struct sk_buff *skb);

/* Use this variant in places where it could be invoked
 * either from interrupt or non-interrupt context.
 */
extern void dev_kfree_skb_any(struct sk_buff *skb);

#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);
extern int		dev_valid_name(const char *name);
extern int		dev_ioctl(struct net *net, unsigned int cmd, void __user *);
extern int		dev_ethtool(struct net *net, struct ifreq *);
extern unsigned		dev_get_flags(const struct net_device *);
extern int		dev_change_flags(struct net_device *, unsigned);
extern int		dev_change_name(struct net_device *, char *);
extern int		dev_change_net_namespace(struct net_device *,
						 struct net *, const char *);
extern int		dev_set_mtu(struct net_device *, int);
extern int		dev_set_mac_address(struct net_device *,
					    struct sockaddr *);
extern int		dev_hard_start_xmit(struct sk_buff *skb,
					    struct net_device *dev);

extern int		netdev_budget;

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

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

/**
 *	dev_hold - get reference to device
 *	@dev: network device
 *
 * Hold reference to device to keep it from being freed.
 */
static inline void dev_hold(struct net_device *dev)
{
	atomic_inc(&dev->refcnt);
}

/* 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.
 *
 * 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.
 */

extern void linkwatch_fire_event(struct net_device *dev);

/**
 *	netif_carrier_ok - test if carrier present
 *	@dev: network device
 *
 * Check if carrier is present on device
 */
static inline int netif_carrier_ok(const struct net_device *dev)
{
	return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

extern void __netdev_watchdog_up(struct net_device *dev);

extern void netif_carrier_on(struct net_device *dev);

extern void netif_carrier_off(struct net_device *dev);

/**
 *	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.
 *
 */
static inline void netif_dormant_on(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

/**
 *	netif_dormant_off - set device as not dormant.
 *	@dev: network device
 *
 * Device is not in dormant state.
 */
static inline void netif_dormant_off(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
		linkwatch_fire_event(dev);
}

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


/**
 *	netif_oper_up - test if device is operational
 *	@dev: network device
 *
 * Check if carrier is operational
 */
static inline int netif_oper_up(const struct net_device *dev) {
	return (dev->operstate == IF_OPER_UP ||
		dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
}

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

extern void netif_device_detach(struct net_device *dev);

extern void netif_device_attach(struct net_device *dev);

/*
 * 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;
}

/* Test if receive needs to be scheduled but only if up */
static inline int netif_rx_schedule_prep(struct net_device *dev,
					 struct napi_struct *napi)
{
	return napi_schedule_prep(napi);
}

/* Add interface to tail of rx poll list. This assumes that _prep has
 * already been called and returned 1.
 */
static inline void __netif_rx_schedule(struct net_device *dev,
				       struct napi_struct *napi)
{
	__napi_schedule(napi);
}

/* Try to reschedule poll. Called by irq handler. */

static inline void netif_rx_schedule(struct net_device *dev,
				     struct napi_struct *napi)
{
	if (netif_rx_schedule_prep(dev, napi))
		__netif_rx_schedule(dev, napi);
}

/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().  */
static inline int netif_rx_reschedule(struct net_device *dev,
				      struct napi_struct *napi)
{
	if (napi_schedule_prep(napi)) {
		__netif_rx_schedule(dev, napi);
		return 1;
	}
	return 0;
}

/* same as netif_rx_complete, except that local_irq_save(flags)
 * has already been issued
 */
static inline void __netif_rx_complete(struct net_device *dev,
				       struct napi_struct *napi)
{
	__napi_complete(napi);
}

/* Remove interface from poll list: it must be in the poll list
 * on current cpu. This primitive is called by dev->poll(), when
 * it completes the work. The device cannot be out of poll list at this
 * moment, it is BUG().
 */
static inline void netif_rx_complete(struct net_device *dev,
				     struct napi_struct *napi)
{
	unsigned long flags;

	local_irq_save(flags);
	__netif_rx_complete(dev, napi);
	local_irq_restore(flags);
}

/**
 *	netif_tx_lock - grab network device transmit lock
 *	@dev: network device
 *	@cpu: cpu number of lock owner
 *
 * Get network device transmit lock
 */
static inline void __netif_tx_lock(struct net_device *dev, int cpu)
{
	spin_lock(&dev->_xmit_lock);
	dev->xmit_lock_owner = cpu;
}

static inline void netif_tx_lock(struct net_device *dev)
{
	__netif_tx_lock(dev, smp_processor_id());
}

static inline void netif_tx_lock_bh(struct net_device *dev)
{
	spin_lock_bh(&dev->_xmit_lock);
	dev->xmit_lock_owner = smp_processor_id();
}

static inline int netif_tx_trylock(struct net_device *dev)
{
	int ok = spin_trylock(&dev->_xmit_lock);
	if (likely(ok))
		dev->xmit_lock_owner = smp_processor_id();
	return ok;
}

static inline void netif_tx_unlock(struct net_device *dev)
{
	dev->xmit_lock_owner = -1;
	spin_unlock(&dev->_xmit_lock);
}

static inline void netif_tx_unlock_bh(struct net_device *dev)
{
	dev->xmit_lock_owner = -1;
	spin_unlock_bh(&dev->_xmit_lock);
}

#define HARD_TX_LOCK(dev, cpu) {			\
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
		__netif_tx_lock(dev, cpu);			\
	}						\
}

#define HARD_TX_UNLOCK(dev) {				\
	if ((dev->features & NETIF_F_LLTX) == 0) {	\
		netif_tx_unlock(dev);			\
	}						\
}

static inline void netif_tx_disable(struct net_device *dev)
{
	netif_tx_lock_bh(dev);
	netif_stop_queue(dev);
	netif_tx_unlock_bh(dev);
}

/* These functions live elsewhere (drivers/net/net_init.c, but related) */

extern void		ether_setup(struct net_device *dev);

/* Support for loadable net-drivers */
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)
extern int		register_netdev(struct net_device *dev);
extern void		unregister_netdev(struct net_device *dev);
/* 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);
extern int		dev_unicast_delete(struct net_device *dev, void *addr, int alen);
extern int		dev_unicast_add(struct net_device *dev, void *addr, int alen);
extern int 		dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
extern int		dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);
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 int 		__dev_addr_delete(struct dev_addr_list **list, int *count, void *addr, int alen, int all);
extern int		__dev_addr_add(struct dev_addr_list **list, int *count, void *addr, int alen, int newonly);
extern void		dev_set_promiscuity(struct net_device *dev, int inc);
extern void		dev_set_allmulti(struct net_device *dev, int inc);
extern void		netdev_state_change(struct net_device *dev);
extern void		netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
extern void		dev_load(struct net *net, const char *name);
extern void		dev_mcast_init(void);
extern int		netdev_max_backlog;
extern int		weight_p;
extern int		netdev_set_master(struct net_device *dev, struct net_device *master);
extern int skb_checksum_help(struct sk_buff *skb);
extern struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features);
#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
/* rx skb timestamps */
extern void		net_enable_timestamp(void);
extern void		net_disable_timestamp(void);

#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

extern void linkwatch_run_queue(void);

extern int netdev_compute_features(unsigned long all, unsigned long one);

static inline int net_gso_ok(int features, int gso_type)
{
	int feature = gso_type << NETIF_F_GSO_SHIFT;
	return (features & feature) == feature;
}

static inline int skb_gso_ok(struct sk_buff *skb, int features)
{
	return net_gso_ok(features, skb_shinfo(skb)->gso_type);
}

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

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

	if (master &&
	    (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
		if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
		    skb->protocol == __constant_htons(ETH_P_ARP))
			return 0;

		if (master->priv_flags & IFF_MASTER_ALB) {
			if (skb->pkt_type != PACKET_BROADCAST &&
			    skb->pkt_type != PACKET_MULTICAST)
				return 0;
		}
		if (master->priv_flags & IFF_MASTER_8023AD &&
		    skb->protocol == __constant_htons(ETH_P_SLOW))
			return 0;

		return 1;
	}
	return 0;
}

#endif /* __KERNEL__ */

#endif	/* _LINUX_DEV_H */