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Linux/include/net/dst_ops.h

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

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