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