LXR linux/include/net/dst

   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 int            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            (*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
  69