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                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        void                    (*destroy)(struct dst_entry *);
  22        void                    (*ifdown)(struct dst_entry *,
  23                                          struct net_device *dev, int how);
  24        struct dst_entry *      (*negative_advice)(struct dst_entry *);
  25        void                    (*link_failure)(struct sk_buff *);
  26        void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
  27        int                     (*local_out)(struct sk_buff *skb);
  28
  29        struct kmem_cache       *kmem_cachep;
  30
  31        struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
  32};
  33
  34static inline int dst_entries_get_fast(struct dst_ops *dst)
  35{
  36        return percpu_counter_read_positive(&dst->pcpuc_entries);
  37}
  38
  39static inline int dst_entries_get_slow(struct dst_ops *dst)
  40{
  41        int res;
  42
  43        local_bh_disable();
  44        res = percpu_counter_sum_positive(&dst->pcpuc_entries);
  45        local_bh_enable();
  46        return res;
  47}
  48
  49static inline void dst_entries_add(struct dst_ops *dst, int val)
  50{
  51        local_bh_disable();
  52        percpu_counter_add(&dst->pcpuc_entries, val);
  53        local_bh_enable();
  54}
  55
  56static inline int dst_entries_init(struct dst_ops *dst)
  57{
  58        return percpu_counter_init(&dst->pcpuc_entries, 0);
  59}
  60
  61static inline void dst_entries_destroy(struct dst_ops *dst)
  62{
  63        percpu_counter_destroy(&dst->pcpuc_entries);
  64}
  65
  66#endif
  67