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 64