1#ifndef _NET_DST_OPS_H
2#define _NET_DST_OPS_H
3#include <linux/types.h>
4#include <linux/percpu_counter.h>
5#include <linux/cache.h>
6
7struct dst_entry;
8struct kmem_cachep;
9struct net_device;
10struct sk_buff;
11struct sock;
12
13struct dst_ops {
14	unsigned short		family;
15	unsigned int		gc_thresh;
16
17	int			(*gc)(struct dst_ops *ops);
18	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);
19	unsigned int		(*default_advmss)(const struct dst_entry *);
20	unsigned int		(*mtu)(const struct dst_entry *);
21	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);
22	void			(*destroy)(struct dst_entry *);
23	void			(*ifdown)(struct dst_entry *,
24					  struct net_device *dev, int how);
25	struct dst_entry *	(*negative_advice)(struct dst_entry *);
26	void			(*link_failure)(struct sk_buff *);
27	void			(*update_pmtu)(struct dst_entry *dst, struct sock *sk,
28					       struct sk_buff *skb, u32 mtu);
29	void			(*redirect)(struct dst_entry *dst, struct sock *sk,
30					    struct sk_buff *skb);
31	int			(*local_out)(struct sk_buff *skb);
32	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst,
33						struct sk_buff *skb,
34						const void *daddr);
35
36	struct kmem_cache	*kmem_cachep;
37
38	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;
39};
40
41static inline int dst_entries_get_fast(struct dst_ops *dst)
42{
43	return percpu_counter_read_positive(&dst->pcpuc_entries);
44}
45
46static inline int dst_entries_get_slow(struct dst_ops *dst)
47{
48	int res;
49
50	local_bh_disable();
51	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
52	local_bh_enable();
53	return res;
54}
55
56static inline void dst_entries_add(struct dst_ops *dst, int val)
57{
58	local_bh_disable();
59	percpu_counter_add(&dst->pcpuc_entries, val);
60	local_bh_enable();
61}
62
63static inline int dst_entries_init(struct dst_ops *dst)
64{
65	return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
66}
67
68static inline void dst_entries_destroy(struct dst_ops *dst)
69{
70	percpu_counter_destroy(&dst->pcpuc_entries);
71}
72
73#endif
74