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Alexey Dobriyan86393e52009-08-29 01:34:49 +00001#ifndef _NET_DST_OPS_H
2#define _NET_DST_OPS_H
3#include <linux/types.h>
Eric Dumazetfc66f952010-10-08 06:37:34 +00004#include <linux/percpu_counter.h>
Paul Mundt43b81f82010-11-07 19:58:05 -08005#include <linux/cache.h>
Alexey Dobriyan86393e52009-08-29 01:34:49 +00006
7struct dst_entry;
8struct kmem_cachep;
9struct net_device;
10struct sk_buff;
11
12struct dst_ops {
13 unsigned short family;
14 __be16 protocol;
15 unsigned gc_thresh;
16
17 int (*gc)(struct dst_ops *ops);
18 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
David S. Miller0dbaee32010-12-13 12:52:14 -080019 unsigned int (*default_advmss)(const struct dst_entry *);
Steffen Klassertebb762f2011-11-23 02:12:51 +000020 unsigned int (*mtu)(const struct dst_entry *);
David S. Miller62fa8a82011-01-26 20:51:05 -080021 u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000022 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, u32 mtu);
28 int (*local_out)(struct sk_buff *skb);
David S. Millerd3aaeb32011-07-18 00:40:17 -070029 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, const void *daddr);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000030
Alexey Dobriyan86393e52009-08-29 01:34:49 +000031 struct kmem_cache *kmem_cachep;
Eric Dumazetfc66f952010-10-08 06:37:34 +000032
33 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000034};
Eric Dumazetfc66f952010-10-08 06:37:34 +000035
36static inline int dst_entries_get_fast(struct dst_ops *dst)
37{
38 return percpu_counter_read_positive(&dst->pcpuc_entries);
39}
40
41static inline int dst_entries_get_slow(struct dst_ops *dst)
42{
43 int res;
44
45 local_bh_disable();
46 res = percpu_counter_sum_positive(&dst->pcpuc_entries);
47 local_bh_enable();
48 return res;
49}
50
51static inline void dst_entries_add(struct dst_ops *dst, int val)
52{
53 local_bh_disable();
54 percpu_counter_add(&dst->pcpuc_entries, val);
55 local_bh_enable();
56}
57
58static inline int dst_entries_init(struct dst_ops *dst)
59{
60 return percpu_counter_init(&dst->pcpuc_entries, 0);
61}
62
63static inline void dst_entries_destroy(struct dst_ops *dst)
64{
65 percpu_counter_destroy(&dst->pcpuc_entries);
66}
67
Alexey Dobriyan86393e52009-08-29 01:34:49 +000068#endif