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> |
Paul Mundt | 43b81f8 | 2010-11-07 19:58:05 -0800 | [diff] [blame] | 5 | #include <linux/cache.h> |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 6 | |
| 7 | struct dst_entry; |
| 8 | struct kmem_cachep; |
| 9 | struct net_device; |
| 10 | struct sk_buff; |
David S. Miller | d8f1641 | 2012-07-19 10:43:03 -0700 | [diff] [blame] | 11 | struct sock; |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 12 | |
| 13 | struct dst_ops { |
| 14 | unsigned short family; |
| 15 | __be16 protocol; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 16 | unsigned int gc_thresh; |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 17 | |
| 18 | int (*gc)(struct dst_ops *ops); |
| 19 | struct dst_entry * (*check)(struct dst_entry *, __u32 cookie); |
David S. Miller | 0dbaee3 | 2010-12-13 12:52:14 -0800 | [diff] [blame] | 20 | unsigned int (*default_advmss)(const struct dst_entry *); |
Steffen Klassert | ebb762f | 2011-11-23 02:12:51 +0000 | [diff] [blame] | 21 | unsigned int (*mtu)(const struct dst_entry *); |
David S. Miller | 62fa8a8 | 2011-01-26 20:51:05 -0800 | [diff] [blame] | 22 | u32 * (*cow_metrics)(struct dst_entry *, unsigned long); |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 23 | void (*destroy)(struct dst_entry *); |
| 24 | void (*ifdown)(struct dst_entry *, |
| 25 | struct net_device *dev, int how); |
| 26 | struct dst_entry * (*negative_advice)(struct dst_entry *); |
| 27 | void (*link_failure)(struct sk_buff *); |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 28 | void (*update_pmtu)(struct dst_entry *dst, struct sock *sk, |
| 29 | struct sk_buff *skb, u32 mtu); |
| 30 | void (*redirect)(struct dst_entry *dst, struct sock *sk, |
| 31 | struct sk_buff *skb); |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 32 | int (*local_out)(struct sk_buff *skb); |
David S. Miller | f894cbf | 2012-07-02 21:52:24 -0700 | [diff] [blame] | 33 | struct neighbour * (*neigh_lookup)(const struct dst_entry *dst, |
| 34 | struct sk_buff *skb, |
| 35 | const void *daddr); |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 36 | |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 37 | struct kmem_cache *kmem_cachep; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 38 | |
| 39 | struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp; |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 40 | }; |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 41 | |
| 42 | static inline int dst_entries_get_fast(struct dst_ops *dst) |
| 43 | { |
| 44 | return percpu_counter_read_positive(&dst->pcpuc_entries); |
| 45 | } |
| 46 | |
| 47 | static inline int dst_entries_get_slow(struct dst_ops *dst) |
| 48 | { |
| 49 | int res; |
| 50 | |
| 51 | local_bh_disable(); |
| 52 | res = percpu_counter_sum_positive(&dst->pcpuc_entries); |
| 53 | local_bh_enable(); |
| 54 | return res; |
| 55 | } |
| 56 | |
| 57 | static inline void dst_entries_add(struct dst_ops *dst, int val) |
| 58 | { |
| 59 | local_bh_disable(); |
| 60 | percpu_counter_add(&dst->pcpuc_entries, val); |
| 61 | local_bh_enable(); |
| 62 | } |
| 63 | |
| 64 | static inline int dst_entries_init(struct dst_ops *dst) |
| 65 | { |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 66 | return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL); |
Eric Dumazet | fc66f95 | 2010-10-08 06:37:34 +0000 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static inline void dst_entries_destroy(struct dst_ops *dst) |
| 70 | { |
| 71 | percpu_counter_destroy(&dst->pcpuc_entries); |
| 72 | } |
| 73 | |
Alexey Dobriyan | 86393e5 | 2009-08-29 01:34:49 +0000 | [diff] [blame] | 74 | #endif |