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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | #ifndef _NET_DST_OPS_H | |
3 | #define _NET_DST_OPS_H | |
4 | #include <linux/types.h> | |
5 | #include <linux/percpu_counter.h> | |
6 | #include <linux/cache.h> | |
7 | ||
8 | struct dst_entry; | |
9 | struct kmem_cachep; | |
10 | struct net_device; | |
11 | struct sk_buff; | |
12 | struct sock; | |
13 | struct net; | |
14 | ||
15 | struct dst_ops { | |
16 | unsigned short family; | |
17 | unsigned int gc_thresh; | |
18 | ||
19 | int (*gc)(struct dst_ops *ops); | |
20 | struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); | |
21 | unsigned int (*default_advmss)(const struct dst_entry *); | |
22 | unsigned int (*mtu)(const struct dst_entry *); | |
23 | u32 * (*cow_metrics)(struct dst_entry *, unsigned long); | |
24 | void (*destroy)(struct dst_entry *); | |
25 | void (*ifdown)(struct dst_entry *, | |
26 | struct net_device *dev, int how); | |
27 | struct dst_entry * (*negative_advice)(struct dst_entry *); | |
28 | void (*link_failure)(struct sk_buff *); | |
29 | void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, | |
30 | struct sk_buff *skb, u32 mtu); | |
31 | void (*redirect)(struct dst_entry *dst, struct sock *sk, | |
32 | struct sk_buff *skb); | |
33 | int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb); | |
34 | struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, | |
35 | struct sk_buff *skb, | |
36 | const void *daddr); | |
37 | void (*confirm_neigh)(const struct dst_entry *dst, | |
38 | const void *daddr); | |
39 | ||
40 | struct kmem_cache *kmem_cachep; | |
41 | ||
42 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; | |
43 | }; | |
44 | ||
45 | static inline int dst_entries_get_fast(struct dst_ops *dst) | |
46 | { | |
47 | return percpu_counter_read_positive(&dst->pcpuc_entries); | |
48 | } | |
49 | ||
50 | static inline int dst_entries_get_slow(struct dst_ops *dst) | |
51 | { | |
52 | return percpu_counter_sum_positive(&dst->pcpuc_entries); | |
53 | } | |
54 | ||
55 | static inline void dst_entries_add(struct dst_ops *dst, int val) | |
56 | { | |
57 | percpu_counter_add(&dst->pcpuc_entries, val); | |
58 | } | |
59 | ||
60 | static inline int dst_entries_init(struct dst_ops *dst) | |
61 | { | |
62 | return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); | |
63 | } | |
64 | ||
65 | static inline void dst_entries_destroy(struct dst_ops *dst) | |
66 | { | |
67 | percpu_counter_destroy(&dst->pcpuc_entries); | |
68 | } | |
69 | ||
70 | #endif |