include/net/dst_ops.h

   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                                                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