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 unsigned int 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 (*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, struct sock *sk, 28 struct sk_buff *skb, u32 mtu); 29 void (*redirect)(struct dst_entry *dst, struct sock *sk, 30 struct sk_buff *skb); 31 int (*local_out)(struct sk_buff *skb); 32 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, 33 struct sk_buff *skb, 34 const void *daddr); 35 36 struct kmem_cache *kmem_cachep; 37 38 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; 39 }; 40 41 static inline int dst_entries_get_fast(struct dst_ops *dst) 42 { 43 return percpu_counter_read_positive(&dst->pcpuc_entries); 44 } 45 46 static inline int dst_entries_get_slow(struct dst_ops *dst) 47 { 48 int res; 49 50 local_bh_disable(); 51 res = percpu_counter_sum_positive(&dst->pcpuc_entries); 52 local_bh_enable(); 53 return res; 54 } 55 56 static inline void dst_entries_add(struct dst_ops *dst, int val) 57 { 58 local_bh_disable(); 59 percpu_counter_add(&dst->pcpuc_entries, val); 60 local_bh_enable(); 61 } 62 63 static inline int dst_entries_init(struct dst_ops *dst) 64 { 65 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); 66 } 67 68 static inline void dst_entries_destroy(struct dst_ops *dst) 69 { 70 percpu_counter_destroy(&dst->pcpuc_entries); 71 } 72 73 #endif 74