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86393e52 AD |
1 | #ifndef _NET_DST_OPS_H |
2 | #define _NET_DST_OPS_H | |
3 | #include <linux/types.h> | |
fc66f95c | 4 | #include <linux/percpu_counter.h> |
43b81f85 | 5 | #include <linux/cache.h> |
86393e52 AD |
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 | ||
86393e52 | 27 | struct kmem_cache *kmem_cachep; |
fc66f95c ED |
28 | |
29 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; | |
86393e52 | 30 | }; |
fc66f95c ED |
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 | ||
86393e52 | 64 | #endif |