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 65