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 #include <linux/cache.h>
   6
   7 struct dst_entry;
   8 struct kmem_cachep;
   9 struct net_device;
  10 struct sk_buff;
  11
  12 struct 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         void                    (*destroy)(struct dst_entry *);
  20         void                    (*ifdown)(struct dst_entry *,
  21                                           struct net_device *dev, int how);
  22         struct dst_entry *      (*negative_advice)(struct dst_entry *);
  23         void                    (*link_failure)(struct sk_buff *);
  24         void                    (*update_pmtu)(struct dst_entry *dst, u32 mtu);
  25         int                     (*local_out)(struct sk_buff *skb);
  26
  27         struct kmem_cache       *kmem_cachep;
  28
  29         struct percpu_counter   pcpuc_entries ____cacheline_aligned_in_smp;
  30 };
  31
  32 static inline int dst_entries_get_fast(struct dst_ops *dst)
  33 {
  34         return percpu_counter_read_positive(&dst->pcpuc_entries);
  35 }
  36
  37 static inline int dst_entries_get_slow(struct dst_ops *dst)
  38 {
  39         int res;
  40
  41         local_bh_disable();
  42         res = percpu_counter_sum_positive(&dst->pcpuc_entries);
  43         local_bh_enable();
  44         return res;
  45 }
  46
  47 static inline void dst_entries_add(struct dst_ops *dst, int val)
  48 {
  49         local_bh_disable();
  50         percpu_counter_add(&dst->pcpuc_entries, val);
  51         local_bh_enable();
  52 }
  53
  54 static inline int dst_entries_init(struct dst_ops *dst)
  55 {
  56         return percpu_counter_init(&dst->pcpuc_entries, 0);
  57 }
  58
  59 static inline void dst_entries_destroy(struct dst_ops *dst)
  60 {
  61         percpu_counter_destroy(&dst->pcpuc_entries);
  62 }
  63
  64 #endif