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#include <linux/cache.h>
6
7struct dst_entry;
8struct kmem_cachep;
9struct net_device;
10struct sk_buff;
11
12struct 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 unsigned int (*default_advmss)(const struct dst_entry *);
20 unsigned int (*default_mtu)(const struct dst_entry *);
21 void (*destroy)(struct dst_entry *);
22 void (*ifdown)(struct dst_entry *,
23 struct net_device *dev, int how);
24 struct dst_entry * (*negative_advice)(struct dst_entry *);
25 void (*link_failure)(struct sk_buff *);
26 void (*update_pmtu)(struct dst_entry *dst, u32 mtu);
27 int (*local_out)(struct sk_buff *skb);
28
29 struct kmem_cache *kmem_cachep;
30
31 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
32};
33
34static inline int dst_entries_get_fast(struct dst_ops *dst)
35{
36 return percpu_counter_read_positive(&dst->pcpuc_entries);
37}
38
39static inline int dst_entries_get_slow(struct dst_ops *dst)
40{
41 int res;
42
43 local_bh_disable();
44 res = percpu_counter_sum_positive(&dst->pcpuc_entries);
45 local_bh_enable();
46 return res;
47}
48
49static inline void dst_entries_add(struct dst_ops *dst, int val)
50{
51 local_bh_disable();
52 percpu_counter_add(&dst->pcpuc_entries, val);
53 local_bh_enable();
54}
55
56static inline int dst_entries_init(struct dst_ops *dst)
57{
58 return percpu_counter_init(&dst->pcpuc_entries, 0);
59}
60
61static inline void dst_entries_destroy(struct dst_ops *dst)
62{
63 percpu_counter_destroy(&dst->pcpuc_entries);
64}
65
66#endif