3 #include <linux/types.h>
4 #include <linux/percpu_counter.h>
5 #include <linux/cache.h>
15 unsigned short family;
16 unsigned int gc_thresh;
18 int (*gc)(struct dst_ops *ops);
19 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
20 unsigned int (*default_advmss)(const struct dst_entry *);
21 unsigned int (*mtu)(const struct dst_entry *);
22 u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
23 void (*destroy)(struct dst_entry *);
24 void (*ifdown)(struct dst_entry *,
25 struct net_device *dev, int how);
26 struct dst_entry * (*negative_advice)(struct dst_entry *);
27 void (*link_failure)(struct sk_buff *);
28 void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
29 struct sk_buff *skb, u32 mtu);
30 void (*redirect)(struct dst_entry *dst, struct sock *sk,
32 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
33 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
37 struct kmem_cache *kmem_cachep;
39 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
42 static inline int dst_entries_get_fast(struct dst_ops *dst)
44 return percpu_counter_read_positive(&dst->pcpuc_entries);
47 static inline int dst_entries_get_slow(struct dst_ops *dst)
52 res = percpu_counter_sum_positive(&dst->pcpuc_entries);
57 static inline void dst_entries_add(struct dst_ops *dst, int val)
60 percpu_counter_add(&dst->pcpuc_entries, val);
64 static inline int dst_entries_init(struct dst_ops *dst)
66 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
69 static inline void dst_entries_destroy(struct dst_ops *dst)
71 percpu_counter_destroy(&dst->pcpuc_entries);