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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
86393e52 AD |
2 | #ifndef _NET_DST_OPS_H |
3 | #define _NET_DST_OPS_H | |
4 | #include <linux/types.h> | |
fc66f95c | 5 | #include <linux/percpu_counter.h> |
43b81f85 | 6 | #include <linux/cache.h> |
86393e52 AD |
7 | |
8 | struct dst_entry; | |
9 | struct kmem_cachep; | |
10 | struct net_device; | |
11 | struct sk_buff; | |
d8f1641b | 12 | struct sock; |
cf91a99d | 13 | struct net; |
86393e52 AD |
14 | |
15 | struct dst_ops { | |
16 | unsigned short family; | |
95c96174 | 17 | unsigned int gc_thresh; |
86393e52 AD |
18 | |
19 | int (*gc)(struct dst_ops *ops); | |
20 | struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); | |
0dbaee3b | 21 | unsigned int (*default_advmss)(const struct dst_entry *); |
ebb762f2 | 22 | unsigned int (*mtu)(const struct dst_entry *); |
62fa8a84 | 23 | u32 * (*cow_metrics)(struct dst_entry *, unsigned long); |
86393e52 AD |
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 *); | |
6700c270 | 29 | void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
30 | struct sk_buff *skb, u32 mtu, |
31 | bool confirm_neigh); | |
6700c270 DM |
32 | void (*redirect)(struct dst_entry *dst, struct sock *sk, |
33 | struct sk_buff *skb); | |
cf91a99d | 34 | int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb); |
f894cbf8 DM |
35 | struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, |
36 | struct sk_buff *skb, | |
37 | const void *daddr); | |
63fca65d JA |
38 | void (*confirm_neigh)(const struct dst_entry *dst, |
39 | const void *daddr); | |
86393e52 | 40 | |
86393e52 | 41 | struct kmem_cache *kmem_cachep; |
fc66f95c ED |
42 | |
43 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; | |
86393e52 | 44 | }; |
fc66f95c ED |
45 | |
46 | static inline int dst_entries_get_fast(struct dst_ops *dst) | |
47 | { | |
48 | return percpu_counter_read_positive(&dst->pcpuc_entries); | |
49 | } | |
50 | ||
51 | static inline int dst_entries_get_slow(struct dst_ops *dst) | |
52 | { | |
c2a2efbb | 53 | return percpu_counter_sum_positive(&dst->pcpuc_entries); |
fc66f95c ED |
54 | } |
55 | ||
cf86a086 | 56 | #define DST_PERCPU_COUNTER_BATCH 32 |
fc66f95c ED |
57 | static inline void dst_entries_add(struct dst_ops *dst, int val) |
58 | { | |
cf86a086 ED |
59 | percpu_counter_add_batch(&dst->pcpuc_entries, val, |
60 | DST_PERCPU_COUNTER_BATCH); | |
fc66f95c ED |
61 | } |
62 | ||
63 | static inline int dst_entries_init(struct dst_ops *dst) | |
64 | { | |
908c7f19 | 65 | return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); |
fc66f95c ED |
66 | } |
67 | ||
68 | static inline void dst_entries_destroy(struct dst_ops *dst) | |
69 | { | |
70 | percpu_counter_destroy(&dst->pcpuc_entries); | |
71 | } | |
72 | ||
86393e52 | 73 | #endif |