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         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
  34 static inline int dst_entries_get_fast(struct dst_ops *dst)
  35 {
  36         return percpu_counter_read_positive(&dst->pcpuc_entries);
  37 }
  38
  39 static 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
  49 static 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
  56 static inline int dst_entries_init(struct dst_ops *dst)
  57 {
  58         return percpu_counter_init(&dst->pcpuc_entries, 0);
  59 }
  60
  61 static inline void dst_entries_destroy(struct dst_ops *dst)
  62 {
  63         percpu_counter_destroy(&dst->pcpuc_entries);
  64 }
  65
  66 #endif