1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _NET_DST_OPS_H
3*4882a593Smuzhiyun #define _NET_DST_OPS_H
4*4882a593Smuzhiyun #include <linux/types.h>
5*4882a593Smuzhiyun #include <linux/percpu_counter.h>
6*4882a593Smuzhiyun #include <linux/cache.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun struct dst_entry;
9*4882a593Smuzhiyun struct kmem_cachep;
10*4882a593Smuzhiyun struct net_device;
11*4882a593Smuzhiyun struct sk_buff;
12*4882a593Smuzhiyun struct sock;
13*4882a593Smuzhiyun struct net;
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct dst_ops {
16*4882a593Smuzhiyun unsigned short family;
17*4882a593Smuzhiyun unsigned int gc_thresh;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun int (*gc)(struct dst_ops *ops);
20*4882a593Smuzhiyun struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
21*4882a593Smuzhiyun unsigned int (*default_advmss)(const struct dst_entry *);
22*4882a593Smuzhiyun unsigned int (*mtu)(const struct dst_entry *);
23*4882a593Smuzhiyun u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
24*4882a593Smuzhiyun void (*destroy)(struct dst_entry *);
25*4882a593Smuzhiyun void (*ifdown)(struct dst_entry *,
26*4882a593Smuzhiyun struct net_device *dev, int how);
27*4882a593Smuzhiyun struct dst_entry * (*negative_advice)(struct dst_entry *);
28*4882a593Smuzhiyun void (*link_failure)(struct sk_buff *);
29*4882a593Smuzhiyun void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
30*4882a593Smuzhiyun struct sk_buff *skb, u32 mtu,
31*4882a593Smuzhiyun bool confirm_neigh);
32*4882a593Smuzhiyun void (*redirect)(struct dst_entry *dst, struct sock *sk,
33*4882a593Smuzhiyun struct sk_buff *skb);
34*4882a593Smuzhiyun int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
35*4882a593Smuzhiyun struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
36*4882a593Smuzhiyun struct sk_buff *skb,
37*4882a593Smuzhiyun const void *daddr);
38*4882a593Smuzhiyun void (*confirm_neigh)(const struct dst_entry *dst,
39*4882a593Smuzhiyun const void *daddr);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun struct kmem_cache *kmem_cachep;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
44*4882a593Smuzhiyun };
45*4882a593Smuzhiyun
dst_entries_get_fast(struct dst_ops * dst)46*4882a593Smuzhiyun static inline int dst_entries_get_fast(struct dst_ops *dst)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun return percpu_counter_read_positive(&dst->pcpuc_entries);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
dst_entries_get_slow(struct dst_ops * dst)51*4882a593Smuzhiyun static inline int dst_entries_get_slow(struct dst_ops *dst)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return percpu_counter_sum_positive(&dst->pcpuc_entries);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun #define DST_PERCPU_COUNTER_BATCH 32
dst_entries_add(struct dst_ops * dst,int val)57*4882a593Smuzhiyun static inline void dst_entries_add(struct dst_ops *dst, int val)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun percpu_counter_add_batch(&dst->pcpuc_entries, val,
60*4882a593Smuzhiyun DST_PERCPU_COUNTER_BATCH);
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
dst_entries_init(struct dst_ops * dst)63*4882a593Smuzhiyun static inline int dst_entries_init(struct dst_ops *dst)
64*4882a593Smuzhiyun {
65*4882a593Smuzhiyun return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
dst_entries_destroy(struct dst_ops * dst)68*4882a593Smuzhiyun static inline void dst_entries_destroy(struct dst_ops *dst)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun percpu_counter_destroy(&dst->pcpuc_entries);
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun #endif
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