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[net-next-2.6.git] / include / net / dst_ops.h
1 #ifndef _NET_DST_OPS_H
2 #define _NET_DST_OPS_H
3 #include <linux/types.h>
4 #include <linux/percpu_counter.h>
5
6 struct dst_entry;
7 struct kmem_cachep;
8 struct net_device;
9 struct sk_buff;
10
11 struct dst_ops {
12         unsigned short          family;
13         __be16                  protocol;
14         unsigned                gc_thresh;
15
16         int                     (*gc)(struct dst_ops *ops);
17         struct dst_entry *      (*check)(struct dst_entry *, __u32 cookie);
18         void                    (*destroy)(struct dst_entry *);
19         void                    (*ifdown)(struct dst_entry *,
20                                           struct net_device *dev, int how);
21         struct dst_entry *      (*negative_advice)(struct dst_entry *);
22         void                    (*link_failure)(struct sk_buff *);
23         void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
24         int                     (*local_out)(struct sk_buff *skb);
25
26         struct kmem_cache       *kmem_cachep;
27
28         struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
29 };
30
31 static inline int dst_entries_get_fast(struct dst_ops *dst)
32 {
33         return percpu_counter_read_positive(&dst->pcpuc_entries);
34 }
35
36 static inline int dst_entries_get_slow(struct dst_ops *dst)
37 {
38         int res;
39
40         local_bh_disable();
41         res = percpu_counter_sum_positive(&dst->pcpuc_entries);
42         local_bh_enable();
43         return res;
44 }
45
46 static inline void dst_entries_add(struct dst_ops *dst, int val)
47 {
48         local_bh_disable();
49         percpu_counter_add(&dst->pcpuc_entries, val);
50         local_bh_enable();
51 }
52
53 static inline int dst_entries_init(struct dst_ops *dst)
54 {
55         return percpu_counter_init(&dst->pcpuc_entries, 0);
56 }
57
58 static inline void dst_entries_destroy(struct dst_ops *dst)
59 {
60         percpu_counter_destroy(&dst->pcpuc_entries);
61 }
62
63 #endif