linux/include/net/dst_ops.h
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   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;
  11struct sock;
  12
  13struct dst_ops {
  14        unsigned short          family;
  15        __be16                  protocol;
  16        unsigned int            gc_thresh;
  17
  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,
  31                                            struct sk_buff *skb);
  32        int                     (*local_out)(struct sk_buff *skb);
  33        struct neighbour *      (*neigh_lookup)(const struct dst_entry *dst,
  34                                                struct sk_buff *skb,
  35                                                const void *daddr);
  36
  37        struct kmem_cache       *kmem_cachep;
  38
  39        struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
  40};
  41
  42static inline int dst_entries_get_fast(struct dst_ops *dst)
  43{
  44        return percpu_counter_read_positive(&dst->pcpuc_entries);
  45}
  46
  47static inline int dst_entries_get_slow(struct dst_ops *dst)
  48{
  49        int res;
  50
  51        local_bh_disable();
  52        res = percpu_counter_sum_positive(&dst->pcpuc_entries);
  53        local_bh_enable();
  54        return res;
  55}
  56
  57static inline void dst_entries_add(struct dst_ops *dst, int val)
  58{
  59        local_bh_disable();
  60        percpu_counter_add(&dst->pcpuc_entries, val);
  61        local_bh_enable();
  62}
  63
  64static inline int dst_entries_init(struct dst_ops *dst)
  65{
  66        return percpu_counter_init(&dst->pcpuc_entries, 0);
  67}
  68
  69static inline void dst_entries_destroy(struct dst_ops *dst)
  70{
  71        percpu_counter_destroy(&dst->pcpuc_entries);
  72}
  73
  74#endif
  75
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