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 struct net; 13 14 struct dst_ops { 15 unsigned short family; 16 unsigned int gc_thresh; 17 18 int (*gc)(struct dst_ops *ops); 19 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); 20 unsigned int (*default_advmss)(const struct dst_entry *); 21 unsigned int (*mtu)(const struct dst_entry *); 22 u32 * (*cow_metrics)(struct dst_entry *, unsigned long); 23 void (*destroy)(struct dst_entry *); 24 void (*ifdown)(struct dst_entry *, 25 struct net_device *dev, int how); 26 struct dst_entry * (*negative_advice)(struct dst_entry *); 27 void (*link_failure)(struct sk_buff *); 28 void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, 29 struct sk_buff *skb, u32 mtu); 30 void (*redirect)(struct dst_entry *dst, struct sock *sk, 31 struct sk_buff *skb); 32 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb); 33 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, 34 struct sk_buff *skb, 35 const void *daddr); 36 37 struct kmem_cache *kmem_cachep; 38 39 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; 40 }; 41 42 static inline int dst_entries_get_fast(struct dst_ops *dst) 43 { 44 return percpu_counter_read_positive(&dst->pcpuc_entries); 45 } 46 47 static inline int dst_entries_get_slow(struct dst_ops *dst) 48 { 49 int res; 50 51 local_bh_disable(); 52 res = percpu_counter_sum_positive(&dst->pcpuc_entries); 53 local_bh_enable(); 54 return res; 55 } 56 57 static inline void dst_entries_add(struct dst_ops *dst, int val) 58 { 59 local_bh_disable(); 60 percpu_counter_add(&dst->pcpuc_entries, val); 61 local_bh_enable(); 62 } 63 64 static inline int dst_entries_init(struct dst_ops *dst) 65 { 66 return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); 67 } 68 69 static inline void dst_entries_destroy(struct dst_ops *dst) 70 { 71 percpu_counter_destroy(&dst->pcpuc_entries); 72 } 73 74 #endif 75