Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 1 | #ifndef _NET_DST_OPS_H |
| 2 | #define _NET_DST_OPS_H |
| 3 | #include <linux/types.h> |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 4 | #include <linux/percpu_counter.h> |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 5 | |
| 6 | struct dst_entry; |
| 7 | struct kmem_cachep; |
| 8 | struct net_device; |
| 9 | struct sk_buff; |
| 10 | |
| 11 | struct dst_ops { |
| 12 | unsigned short family; |
| 13 | __be16 protocol; |
| 14 | unsigned gc_thresh; |
| 15 | |
| 16 | int (*gc)(struct dst_ops *ops); |
| 17 | struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); |
| 18 | void (*destroy)(struct dst_entry *); |
| 19 | void (*ifdown)(struct dst_entry *, |
| 20 | struct net_device *dev, int how); |
| 21 | struct dst_entry * (*negative_advice)(struct dst_entry *); |
| 22 | void (*link_failure)(struct sk_buff *); |
| 23 | void (*update_pmtu)(struct dst_entry *dst, u32 mtu); |
| 24 | int (*local_out)(struct sk_buff *skb); |
| 25 | |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 26 | struct kmem_cache *kmem_cachep; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 27 | |
| 28 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 29 | }; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 30 | |
| 31 | static inline int dst_entries_get_fast(struct dst_ops *dst) |
| 32 | { |
| 33 | return percpu_counter_read_positive(&dst->pcpuc_entries); |
| 34 | } |
| 35 | |
| 36 | static inline int dst_entries_get_slow(struct dst_ops *dst) |
| 37 | { |
| 38 | int res; |
| 39 | |
| 40 | local_bh_disable(); |
| 41 | res = percpu_counter_sum_positive(&dst->pcpuc_entries); |
| 42 | local_bh_enable(); |
| 43 | return res; |
| 44 | } |
| 45 | |
| 46 | static inline void dst_entries_add(struct dst_ops *dst, int val) |
| 47 | { |
| 48 | local_bh_disable(); |
| 49 | percpu_counter_add(&dst->pcpuc_entries, val); |
| 50 | local_bh_enable(); |
| 51 | } |
| 52 | |
| 53 | static inline int dst_entries_init(struct dst_ops *dst) |
| 54 | { |
| 55 | return percpu_counter_init(&dst->pcpuc_entries, 0); |
| 56 | } |
| 57 | |
| 58 | static inline void dst_entries_destroy(struct dst_ops *dst) |
| 59 | { |
| 60 | percpu_counter_destroy(&dst->pcpuc_entries); |
| 61 | } |
| 62 | |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 63 | #endif |