[mirror_ubuntu-bionic-kernel.git] / include / net / dst_ops.h

#ifndef _NET_DST_OPS_H
#define _NET_DST_OPS_H
#include <linux/types.h>
#include <linux/percpu_counter.h>
#include <linux/cache.h>

struct dst_entry;
struct kmem_cachep;
struct net_device;
struct sk_buff;

struct dst_ops {
	unsigned short		family;
	__be16			protocol;
	unsigned		gc_thresh;

	int			(*gc)(struct dst_ops *ops);
	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);
	unsigned int		(*default_advmss)(const struct dst_entry *);
	unsigned int		(*default_mtu)(const struct dst_entry *);
	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);
	void			(*destroy)(struct dst_entry *);
	void			(*ifdown)(struct dst_entry *,
					  struct net_device *dev, int how);
	struct dst_entry *	(*negative_advice)(struct dst_entry *);
	void			(*link_failure)(struct sk_buff *);
	void			(*update_pmtu)(struct dst_entry *dst, u32 mtu);
	int			(*local_out)(struct sk_buff *skb);
	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst, const void *daddr);

	struct kmem_cache	*kmem_cachep;

	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;
};

static inline int dst_entries_get_fast(struct dst_ops *dst)
{
	return percpu_counter_read_positive(&dst->pcpuc_entries);
}

static inline int dst_entries_get_slow(struct dst_ops *dst)
{
	int res;

	local_bh_disable();
	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
	local_bh_enable();
	return res;
}

static inline void dst_entries_add(struct dst_ops *dst, int val)
{
	local_bh_disable();
	percpu_counter_add(&dst->pcpuc_entries, val);
	local_bh_enable();
}

static inline int dst_entries_init(struct dst_ops *dst)
{
	return percpu_counter_init(&dst->pcpuc_entries, 0);
}

static inline void dst_entries_destroy(struct dst_ops *dst)
{
	percpu_counter_destroy(&dst->pcpuc_entries);
}

#endif
Commit	Line	Data
86393e52 AD	1	#ifndef _NET_DST_OPS_H
	2	#define _NET_DST_OPS_H
	3	#include <linux/types.h>
fc66f95c	4	#include <linux/percpu_counter.h>
43b81f85	5	#include <linux/cache.h>
86393e52 AD	6
	7	struct dst_entry;
	8	struct kmem_cachep;
	9	struct net_device;
	10	struct sk_buff;
	11
	12	struct dst_ops {
	13	unsigned short family;
	14	__be16 protocol;
	15	unsigned gc_thresh;
	16
	17	int (gc)(struct dst_ops ops);
	18	struct dst_entry * (check)(struct dst_entry , __u32 cookie);
0dbaee3b	19	unsigned int (default_advmss)(const struct dst_entry );
d33e4553	20	unsigned int (default_mtu)(const struct dst_entry );
62fa8a84	21	u32 * (cow_metrics)(struct dst_entry , unsigned long);
86393e52 AD	22	void (destroy)(struct dst_entry );
	23	void (ifdown)(struct dst_entry ,
	24	struct net_device *dev, int how);
	25	struct dst_entry * (negative_advice)(struct dst_entry );
	26	void (link_failure)(struct sk_buff );
	27	void (update_pmtu)(struct dst_entry dst, u32 mtu);
	28	int (local_out)(struct sk_buff skb);
d3aaeb38	29	struct neighbour * (neigh_lookup)(const struct dst_entry dst, const void *daddr);
86393e52	30
86393e52	31	struct kmem_cache *kmem_cachep;
fc66f95c ED	32
fc66f95c ED	33	struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
86393e52	34	};
fc66f95c ED	35
	36	static inline int dst_entries_get_fast(struct dst_ops *dst)
	37	{
	38	return percpu_counter_read_positive(&dst->pcpuc_entries);
	39	}
	40
	41	static inline int dst_entries_get_slow(struct dst_ops *dst)
	42	{
	43	int res;
	44
	45	local_bh_disable();
	46	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
	47	local_bh_enable();
	48	return res;
	49	}
	50
	51	static inline void dst_entries_add(struct dst_ops *dst, int val)
	52	{
	53	local_bh_disable();
	54	percpu_counter_add(&dst->pcpuc_entries, val);
	55	local_bh_enable();
	56	}
	57
	58	static inline int dst_entries_init(struct dst_ops *dst)
	59	{
	60	return percpu_counter_init(&dst->pcpuc_entries, 0);
	61	}
	62
	63	static inline void dst_entries_destroy(struct dst_ops *dst)
	64	{
	65	percpu_counter_destroy(&dst->pcpuc_entries);
	66	}
	67
86393e52	68	#endif