Release 4.7 include/net/dst_ops.h

#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 net;


struct dst_ops {
	
unsigned short		family;
	
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 net *net, struct sock *sk, 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);
}

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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;
}

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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();
}

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static inline int dst_entries_init(struct dst_ops *dst)
{
	return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
}

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static inline void dst_entries_destroy(struct dst_ops *dst)
{
	percpu_counter_destroy(&dst->pcpuc_entries);
}

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#endif
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Directory: include/net

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