1 /* SPDX-License-Identifier: GPL-2.0 */
4 #include <linux/types.h>
5 #include <linux/percpu_counter.h>
6 #include <linux/cache.h>
16 unsigned short family;
17 unsigned int gc_thresh;
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,
33 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
34 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
37 void (*confirm_neigh)(const struct dst_entry *dst,
40 struct kmem_cache *kmem_cachep;
42 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
45 static inline int dst_entries_get_fast(struct dst_ops *dst)
47 return percpu_counter_read_positive(&dst->pcpuc_entries);
50 static inline int dst_entries_get_slow(struct dst_ops *dst)
52 return percpu_counter_sum_positive(&dst->pcpuc_entries);
55 static inline void dst_entries_add(struct dst_ops *dst, int val)
57 percpu_counter_add(&dst->pcpuc_entries, val);
60 static inline int dst_entries_init(struct dst_ops *dst)
62 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
65 static inline void dst_entries_destroy(struct dst_ops *dst)
67 percpu_counter_destroy(&dst->pcpuc_entries);