1#ifndef _NET_DST_OPS_H
 2#define _NET_DST_OPS_H
 3#include <linux/types.h>
 4#include <linux/percpu_counter.h>
 5#include <linux/cache.h>
 6
 7struct dst_entry;
 8struct kmem_cachep;
 9struct net_device;
10struct sk_buff;
 
 
11
12struct dst_ops {
13	unsigned short		family;
14	__be16			protocol;
15	unsigned		gc_thresh;
16
17	int			(*gc)(struct dst_ops *ops);
18	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);
19	unsigned int		(*default_advmss)(const struct dst_entry *);
20	unsigned int		(*default_mtu)(const struct dst_entry *);
21	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);
22	void			(*destroy)(struct dst_entry *);
23	void			(*ifdown)(struct dst_entry *,
24					  struct net_device *dev, int how);
25	struct dst_entry *	(*negative_advice)(struct dst_entry *);
26	void			(*link_failure)(struct sk_buff *);
27	void			(*update_pmtu)(struct dst_entry *dst, u32 mtu);
28	int			(*local_out)(struct sk_buff *skb);
29	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst, const void *daddr);
 
 
 
 
 
 
 
 
30
31	struct kmem_cache	*kmem_cachep;
32
33	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;
34};
35
36static inline int dst_entries_get_fast(struct dst_ops *dst)
37{
38	return percpu_counter_read_positive(&dst->pcpuc_entries);
39}
40
41static inline int dst_entries_get_slow(struct dst_ops *dst)
42{
43	int res;
44
45	local_bh_disable();
46	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
47	local_bh_enable();
48	return res;
49}
50
 
51static inline void dst_entries_add(struct dst_ops *dst, int val)
52{
53	local_bh_disable();
54	percpu_counter_add(&dst->pcpuc_entries, val);
55	local_bh_enable();
56}
57
58static inline int dst_entries_init(struct dst_ops *dst)
59{
60	return percpu_counter_init(&dst->pcpuc_entries, 0);
61}
62
63static inline void dst_entries_destroy(struct dst_ops *dst)
64{
65	percpu_counter_destroy(&dst->pcpuc_entries);
66}
67
68#endif

 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	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	void			(*negative_advice)(struct sock *sk, 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