#ifndef _NET_DST_OPS_H#define _NET_DST_OPS_H#include <linux/types.h>#include <linux/percpu_counter.h>#include <linux/cache.h> struct dst_entry;struct kmem_cachep;struct net_device;struct sk_buff;struct sock; struct dst_ops {	unsigned short		family;	__be16			protocol;	unsigned int		gc_thresh; 	int			(*gc)(struct dst_ops *ops);	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);	unsigned int		(*default_advmss)(const struct dst_entry *);	unsigned int		(*mtu)(const struct dst_entry *);	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);	void			(*destroy)(struct dst_entry *);	void			(*ifdown)(struct dst_entry *,					  struct net_device *dev, int how);	struct dst_entry *	(*negative_advice)(struct dst_entry *);	void			(*link_failure)(struct sk_buff *);	void			(*update_pmtu)(struct dst_entry *dst, struct sock *sk,					       struct sk_buff *skb, u32 mtu);	void			(*redirect)(struct dst_entry *dst, struct sock *sk,					    struct sk_buff *skb);	int			(*local_out)(struct sk_buff *skb);	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst,						struct sk_buff *skb,						const void *daddr); 	struct kmem_cache	*kmem_cachep; 	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;}; static inline int dst_entries_get_fast(struct dst_ops *dst){	return percpu_counter_read_positive(&dst->pcpuc_entries);} static inline int dst_entries_get_slow(struct dst_ops *dst){	int res; 	local_bh_disable();	res = percpu_counter_sum_positive(&dst->pcpuc_entries);	local_bh_enable();	return res;} static inline void dst_entries_add(struct dst_ops *dst, int val){	local_bh_disable();	percpu_counter_add(&dst->pcpuc_entries, val);	local_bh_enable();} static inline int dst_entries_init(struct dst_ops *dst){	return percpu_counter_init(&dst->pcpuc_entries, 0);} static inline void dst_entries_destroy(struct dst_ops *dst){	percpu_counter_destroy(&dst->pcpuc_entries);} #endif