Merge tag 'landlock-6.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/mic...
[linux-2.6-microblaze.git] / include / net / dst_ops.h
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         void                    (*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);
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
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 {
53         return percpu_counter_sum_positive(&dst->pcpuc_entries);
54 }
55
56 #define DST_PERCPU_COUNTER_BATCH 32
57 static 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
63 static inline int dst_entries_init(struct dst_ops *dst)
64 {
65         return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
66 }
67
68 static inline void dst_entries_destroy(struct dst_ops *dst)
69 {
70         percpu_counter_destroy(&dst->pcpuc_entries);
71 }
72
73 #endif