tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _NET_DST_OPS_H
2#define _NET_DST_OPS_H
3#include <linux/types.h>
4#include <linux/percpu_counter.h>
5
6struct dst_entry;
7struct kmem_cachep;
8struct net_device;
9struct sk_buff;
10
11struct 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
31static inline int dst_entries_get_fast(struct dst_ops *dst)
32{
33 return percpu_counter_read_positive(&dst->pcpuc_entries);
34}
35
36static 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
46static 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
53static inline int dst_entries_init(struct dst_ops *dst)
54{
55 return percpu_counter_init(&dst->pcpuc_entries, 0);
56}
57
58static inline void dst_entries_destroy(struct dst_ops *dst)
59{
60 percpu_counter_destroy(&dst->pcpuc_entries);
61}
62
63#endif