include/net/dst_ops.h

   1 #ifndef _NET_DST_OPS_H
   2 #define _NET_DST_OPS_H
   3 #include <linux/types.h>
   4 #include <linux/percpu_counter.h>
   5
   6 struct dst_entry;
   7 struct kmem_cachep;
   8 struct net_device;
   9 struct sk_buff;
  10
  11 struct dst_ops {
  12         unsigned short          family;
  13         __be16                  protocol;
  14         unsigned                gc_thresh;
  15
  16         int                     (*gc)(struct dst_ops *ops);
  17         struct dst_entry *      (*check)(struct dst_entry *, __u32 cookie);
  18         void                    (*destroy)(struct dst_entry *);
  19         void                    (*ifdown)(struct dst_entry *,
  20                                           struct net_device *dev, int how);
  21         struct dst_entry *      (*negative_advice)(struct dst_entry *);
  22         void                    (*link_failure)(struct sk_buff *);
  23         void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
  24         int                     (*local_out)(struct sk_buff *skb);
  25
  26         struct kmem_cache       *kmem_cachep;
  27
  28         struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
  29 };
  30
  31 static inline int dst_entries_get_fast(struct dst_ops *dst)
  32 {
  33         return percpu_counter_read_positive(&dst->pcpuc_entries);
  34 }
  35
  36 static inline int dst_entries_get_slow(struct dst_ops *dst)
  37 {
  38         int res;
  39
  40         local_bh_disable();
  41         res = percpu_counter_sum_positive(&dst->pcpuc_entries);
  42         local_bh_enable();
  43         return res;
  44 }
  45
  46 static inline void dst_entries_add(struct dst_ops *dst, int val)
  47 {
  48         local_bh_disable();
  49         percpu_counter_add(&dst->pcpuc_entries, val);
  50         local_bh_enable();
  51 }
  52
  53 static inline int dst_entries_init(struct dst_ops *dst)
  54 {
  55         return percpu_counter_init(&dst->pcpuc_entries, 0);
  56 }
  57
  58 static inline void dst_entries_destroy(struct dst_ops *dst)
  59 {
  60         percpu_counter_destroy(&dst->pcpuc_entries);
  61 }
  62
  63 #endif