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Merge branches 'stable/drivers-3.2', 'stable/drivers.bugfixes-3.2' and 'stable/pci...
[mirror_ubuntu-bionic-kernel.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 unsigned int (*default_advmss)(const struct dst_entry *);
20 unsigned int (*default_mtu)(const struct dst_entry *);
21 u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
22 void (*destroy)(struct dst_entry *);
23 void (*ifdown)(struct dst_entry *,
24 struct net_device *dev, int how);
25 struct dst_entry * (*negative_advice)(struct dst_entry *);
26 void (*link_failure)(struct sk_buff *);
27 void (*update_pmtu)(struct dst_entry *dst, u32 mtu);
28 int (*local_out)(struct sk_buff *skb);
29 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, const void *daddr);
30
31 struct kmem_cache *kmem_cachep;
32
33 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
34 };
35
36 static inline int dst_entries_get_fast(struct dst_ops *dst)
37 {
38 return percpu_counter_read_positive(&dst->pcpuc_entries);
39 }
40
41 static inline int dst_entries_get_slow(struct dst_ops *dst)
42 {
43 int res;
44
45 local_bh_disable();
46 res = percpu_counter_sum_positive(&dst->pcpuc_entries);
47 local_bh_enable();
48 return res;
49 }
50
51 static inline void dst_entries_add(struct dst_ops *dst, int val)
52 {
53 local_bh_disable();
54 percpu_counter_add(&dst->pcpuc_entries, val);
55 local_bh_enable();
56 }
57
58 static inline int dst_entries_init(struct dst_ops *dst)
59 {
60 return percpu_counter_init(&dst->pcpuc_entries, 0);
61 }
62
63 static inline void dst_entries_destroy(struct dst_ops *dst)
64 {
65 percpu_counter_destroy(&dst->pcpuc_entries);
66 }
67
68 #endif