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 u32 * (*cow_metrics)(struct dst_entry *, unsigned long); 22 void (*destroy)(struct dst_entry *); 23 void (*ifdown)(struct dst_entry *, 24 struct net_device *dev, int how); 25 struct dst_entry * (*negative_advice)(struct dst_entry *); 26 void (*link_failure)(struct sk_buff *); 27 void (*update_pmtu)(struct dst_entry *dst, u32 mtu); 28 int (*local_out)(struct sk_buff *skb); 29 30 struct kmem_cache *kmem_cachep; 31 32 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; 33 }; 34 35 static inline int dst_entries_get_fast(struct dst_ops *dst) 36 { 37 return percpu_counter_read_positive(&dst->pcpuc_entries); 38 } 39 40 static inline int dst_entries_get_slow(struct dst_ops *dst) 41 { 42 int res; 43 44 local_bh_disable(); 45 res = percpu_counter_sum_positive(&dst->pcpuc_entries); 46 local_bh_enable(); 47 return res; 48 } 49 50 static inline void dst_entries_add(struct dst_ops *dst, int val) 51 { 52 local_bh_disable(); 53 percpu_counter_add(&dst->pcpuc_entries, val); 54 local_bh_enable(); 55 } 56 57 static inline int dst_entries_init(struct dst_ops *dst) 58 { 59 return percpu_counter_init(&dst->pcpuc_entries, 0); 60 } 61 62 static inline void dst_entries_destroy(struct dst_ops *dst) 63 { 64 percpu_counter_destroy(&dst->pcpuc_entries); 65 } 66 67 #endif 68