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 |
71 | |