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 67