| 1 |
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| 2 | #ifndef _NET_DST_OPS_H
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| 3 | #define _NET_DST_OPS_H
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| 4 | #include <linux/types.h>
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| 5 | #include <linux/percpu_counter.h>
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| 6 | #include <linux/cache.h>
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| 7 |
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| 8 | struct dst_entry;
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| 9 | struct kmem_cachep;
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| 10 | struct net_device;
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| 11 | struct sk_buff;
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| 12 | struct sock;
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| 13 | struct net;
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| 14 |
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| 15 | struct dst_ops {
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| 16 | unsigned short family;
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| 17 | unsigned int gc_thresh;
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| 18 |
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| 19 | void (*gc)(struct dst_ops *ops);
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| 20 | struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
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| 21 | unsigned int (*default_advmss)(const struct dst_entry *);
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| 22 | unsigned int (*mtu)(const struct dst_entry *);
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| 23 | u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
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| 24 | void (*destroy)(struct dst_entry *);
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| 25 | void (*ifdown)(struct dst_entry *,
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| 26 | struct net_device *dev);
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| 27 | void (*negative_advice)(struct sock *sk, struct dst_entry *);
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| 28 | void (*link_failure)(struct sk_buff *);
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| 29 | void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
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| 30 | struct sk_buff *skb, u32 mtu,
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| 31 | bool confirm_neigh);
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| 32 | void (*redirect)(struct dst_entry *dst, struct sock *sk,
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| 33 | struct sk_buff *skb);
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| 34 | int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
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| 35 | struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
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| 36 | struct sk_buff *skb,
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| 37 | const void *daddr);
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| 38 | void (*confirm_neigh)(const struct dst_entry *dst,
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| 39 | const void *daddr);
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| 40 |
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| 41 | struct kmem_cache *kmem_cachep;
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| 42 |
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| 43 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
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| 44 | };
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| 45 |
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| 46 | static inline int dst_entries_get_fast(struct dst_ops *dst)
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| 47 | {
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| 48 | return percpu_counter_read_positive(&dst->pcpuc_entries);
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| 49 | }
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| 50 |
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| 51 | static inline int dst_entries_get_slow(struct dst_ops *dst)
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| 52 | {
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| 53 | return percpu_counter_sum_positive(&dst->pcpuc_entries);
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| 54 | }
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| 55 |
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| 56 | #define DST_PERCPU_COUNTER_BATCH 32
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| 57 | static inline void dst_entries_add(struct dst_ops *dst, int val)
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| 58 | {
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| 59 | percpu_counter_add_batch(&dst->pcpuc_entries, val,
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| 60 | DST_PERCPU_COUNTER_BATCH);
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| 61 | }
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| 62 |
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| 63 | static inline int dst_entries_init(struct dst_ops *dst)
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| 64 | {
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| 65 | return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
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| 66 | }
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| 67 |
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| 68 | static inline void dst_entries_destroy(struct dst_ops *dst)
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| 69 | {
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| 70 | percpu_counter_destroy(&dst->pcpuc_entries);
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| 71 | }
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| 72 |
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| 73 | #endif
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