net dst: need linux/cache.h for ____cacheline_aligned_in_smp.
[linux-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 #include <linux/cache.h>
6
7 struct dst_entry;
8 struct kmem_cachep;
9 struct net_device;
10 struct sk_buff;
11
12 struct 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);
19         void                    (*destroy)(struct dst_entry *);
20         void                    (*ifdown)(struct dst_entry *,
21                                           struct net_device *dev, int how);
22         struct dst_entry *      (*negative_advice)(struct dst_entry *);
23         void                    (*link_failure)(struct sk_buff *);
24         void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
25         int                     (*local_out)(struct sk_buff *skb);
26
27         struct kmem_cache       *kmem_cachep;
28
29         struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
30 };
31
32 static inline int dst_entries_get_fast(struct dst_ops *dst)
33 {
34         return percpu_counter_read_positive(&dst->pcpuc_entries);
35 }
36
37 static inline int dst_entries_get_slow(struct dst_ops *dst)
38 {
39         int res;
40
41         local_bh_disable();
42         res = percpu_counter_sum_positive(&dst->pcpuc_entries);
43         local_bh_enable();
44         return res;
45 }
46
47 static inline void dst_entries_add(struct dst_ops *dst, int val)
48 {
49         local_bh_disable();
50         percpu_counter_add(&dst->pcpuc_entries, val);
51         local_bh_enable();
52 }
53
54 static inline int dst_entries_init(struct dst_ops *dst)
55 {
56         return percpu_counter_init(&dst->pcpuc_entries, 0);
57 }
58
59 static inline void dst_entries_destroy(struct dst_ops *dst)
60 {
61         percpu_counter_destroy(&dst->pcpuc_entries);
62 }
63
64 #endif