1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NET_DST_OPS_H 3 #define _NET_DST_OPS_H 4 #include <linux/types.h> 5 #include <linux/percpu_counter.h> 6 #include <linux/cache.h> 7 8 struct dst_entry; 9 struct kmem_cachep; 10 struct net_device; 11 struct sk_buff; 12 struct sock; 13 struct net; 14 15 struct dst_ops { 16 unsigned short family; 17 unsigned int gc_thresh; 18 19 void (*gc)(struct dst_ops *ops); 20 struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); 21 unsigned int (*default_advmss)(const struct dst_entry *); 22 unsigned int (*mtu)(const struct dst_entry *); 23 u32 * (*cow_metrics)(struct dst_entry *, unsigned long); 24 void (*destroy)(struct dst_entry *); 25 void (*ifdown)(struct dst_entry *, 26 struct net_device *dev); 27 void (*negative_advice)(struct sock *sk, struct dst_entry *); 28 void (*link_failure)(struct sk_buff *); 29 void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, 30 struct sk_buff *skb, u32 mtu, 31 bool confirm_neigh); 32 void (*redirect)(struct dst_entry *dst, struct sock *sk, 33 struct sk_buff *skb); 34 int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb); 35 struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, 36 struct sk_buff *skb, 37 const void *daddr); 38 void (*confirm_neigh)(const struct dst_entry *dst, 39 const void *daddr); 40 41 struct kmem_cache *kmem_cachep; 42 43 struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; 44 }; 45 46 static inline int dst_entries_get_fast(struct dst_ops *dst) 47 { 48 return percpu_counter_read_positive(&dst->pcpuc_entries); 49 } 50 51 static inline int dst_entries_get_slow(struct dst_ops *dst) 52 { 53 return percpu_counter_sum_positive(&dst->pcpuc_entries); 54 } 55 56 #define DST_PERCPU_COUNTER_BATCH 32 57 static inline void dst_entries_add(struct dst_ops *dst, int val) 58 { 59 percpu_counter_add_batch(&dst->pcpuc_entries, val, 60 DST_PERCPU_COUNTER_BATCH); 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