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
dst_entries_get_fast(struct dst_ops * dst)45 static inline int dst_entries_get_fast(struct dst_ops *dst)
46 {
47 return percpu_counter_read_positive(&dst->pcpuc_entries);
48 }
49
dst_entries_get_slow(struct dst_ops * dst)50 static inline int dst_entries_get_slow(struct dst_ops *dst)
51 {
52 return percpu_counter_sum_positive(&dst->pcpuc_entries);
53 }
54
dst_entries_add(struct dst_ops * dst,int val)55 static inline void dst_entries_add(struct dst_ops *dst, int val)
56 {
57 percpu_counter_add(&dst->pcpuc_entries, val);
58 }
59
dst_entries_init(struct dst_ops * dst)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
dst_entries_destroy(struct dst_ops * dst)65 static inline void dst_entries_destroy(struct dst_ops *dst)
66 {
67 percpu_counter_destroy(&dst->pcpuc_entries);
68 }
69
70 #endif
71
