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 struct sock;
  12
  13 struct 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
  42 static inline int dst_entries_get_fast(struct dst_ops *dst)
  43 {
  44         return percpu_counter_read_positive(&dst->pcpuc_entries);
  45 }
  46
  47 static 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
  57 static 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
  64 static inline int dst_entries_init(struct dst_ops *dst)
  65 {
  66         return percpu_counter_init(&dst->pcpuc_entries, 0);
  67 }
  68
  69 static inline void dst_entries_destroy(struct dst_ops *dst)
  70 {
  71         percpu_counter_destroy(&dst->pcpuc_entries);
  72 }
  73
  74 #endif