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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;
David S. Millerd8f16412012-07-19 10:43:03 -070011struct sock;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000012
13struct dst_ops {
14 unsigned short family;
Eric Dumazet95c96172012-04-15 05:58:06 +000015 unsigned int gc_thresh;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000016
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 *);
David S. Miller6700c272012-07-17 03:29:28 -070027 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);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000031 int (*local_out)(struct sk_buff *skb);
David S. Millerf894cbf2012-07-02 21:52:24 -070032 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
33 struct sk_buff *skb,
34 const void *daddr);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000035
Alexey Dobriyan86393e52009-08-29 01:34:49 +000036 struct kmem_cache *kmem_cachep;
Eric Dumazetfc66f952010-10-08 06:37:34 +000037
38 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000039};
Eric Dumazetfc66f952010-10-08 06:37:34 +000040
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{
Tejun Heo908c7f12014-09-08 09:51:29 +090065 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
Eric Dumazetfc66f952010-10-08 06:37:34 +000066}
67
68static inline void dst_entries_destroy(struct dst_ops *dst)
69{
70 percpu_counter_destroy(&dst->pcpuc_entries);
71}
72
Alexey Dobriyan86393e52009-08-29 01:34:49 +000073#endif