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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;
15 __be16 protocol;
Eric Dumazet95c96172012-04-15 05:58:06 +000016 unsigned int gc_thresh;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000017
18 int (*gc)(struct dst_ops *ops);
19 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
David S. Miller0dbaee32010-12-13 12:52:14 -080020 unsigned int (*default_advmss)(const struct dst_entry *);
Steffen Klassertebb762f2011-11-23 02:12:51 +000021 unsigned int (*mtu)(const struct dst_entry *);
David S. Miller62fa8a82011-01-26 20:51:05 -080022 u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000023 void (*destroy)(struct dst_entry *);
24 void (*ifdown)(struct dst_entry *,
25 struct net_device *dev, int how);
26 struct dst_entry * (*negative_advice)(struct dst_entry *);
27 void (*link_failure)(struct sk_buff *);
David S. Miller6700c272012-07-17 03:29:28 -070028 void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
29 struct sk_buff *skb, u32 mtu);
30 void (*redirect)(struct dst_entry *dst, struct sock *sk,
31 struct sk_buff *skb);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000032 int (*local_out)(struct sk_buff *skb);
David S. Millerf894cbf2012-07-02 21:52:24 -070033 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
34 struct sk_buff *skb,
35 const void *daddr);
Alexey Dobriyan86393e52009-08-29 01:34:49 +000036
Alexey Dobriyan86393e52009-08-29 01:34:49 +000037 struct kmem_cache *kmem_cachep;
Eric Dumazetfc66f952010-10-08 06:37:34 +000038
39 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
Alexey Dobriyan86393e52009-08-29 01:34:49 +000040};
Eric Dumazetfc66f952010-10-08 06:37:34 +000041
42static inline int dst_entries_get_fast(struct dst_ops *dst)
43{
44 return percpu_counter_read_positive(&dst->pcpuc_entries);
45}
46
47static inline int dst_entries_get_slow(struct dst_ops *dst)
48{
49 int res;
50
51 local_bh_disable();
52 res = percpu_counter_sum_positive(&dst->pcpuc_entries);
53 local_bh_enable();
54 return res;
55}
56
57static inline void dst_entries_add(struct dst_ops *dst, int val)
58{
59 local_bh_disable();
60 percpu_counter_add(&dst->pcpuc_entries, val);
61 local_bh_enable();
62}
63
64static inline int dst_entries_init(struct dst_ops *dst)
65{
Tejun Heo908c7f12014-09-08 09:51:29 +090066 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
Eric Dumazetfc66f952010-10-08 06:37:34 +000067}
68
69static inline void dst_entries_destroy(struct dst_ops *dst)
70{
71 percpu_counter_destroy(&dst->pcpuc_entries);
72}
73
Alexey Dobriyan86393e52009-08-29 01:34:49 +000074#endif