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
8struct dst_entry;
9struct kmem_cachep;
10struct net_device;
11struct sk_buff;
12struct sock;
13struct net;
14
15struct 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 bool confirm_neigh);
32 void (*redirect)(struct dst_entry *dst, struct sock *sk,
33 struct sk_buff *skb);
34 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
35 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
36 struct sk_buff *skb,
37 const void *daddr);
38 void (*confirm_neigh)(const struct dst_entry *dst,
39 const void *daddr);
40
41 struct kmem_cache *kmem_cachep;
42
43 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
44};
45
46static inline int dst_entries_get_fast(struct dst_ops *dst)
47{
48 return percpu_counter_read_positive(&dst->pcpuc_entries);
49}
50
51static inline int dst_entries_get_slow(struct dst_ops *dst)
52{
53 return percpu_counter_sum_positive(&dst->pcpuc_entries);
54}
55
56#define DST_PERCPU_COUNTER_BATCH 32
57static inline void dst_entries_add(struct dst_ops *dst, int val)
58{
59 percpu_counter_add_batch(&dst->pcpuc_entries, val,
60 DST_PERCPU_COUNTER_BATCH);
61}
62
63static inline int dst_entries_init(struct dst_ops *dst)
64{
65 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
66}
67
68static inline void dst_entries_destroy(struct dst_ops *dst)
69{
70 percpu_counter_destroy(&dst->pcpuc_entries);
71}
72
73#endif
74

source code of linux/include/net/dst_ops.h