root/include/net/dst_ops.h

INCLUDED FROM

DEFINITIONS

1. dst_entries_get_fast
2. dst_entries_get_slow
3. dst_entries_add
4. dst_entries_init
5. dst_entries_destroy

#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 sock;

struct dst_ops {
        unsigned short          family;
        __be16                  protocol;
        unsigned int            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            (*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, struct sock *sk,
                                               struct sk_buff *skb, u32 mtu);
        void                    (*redirect)(struct dst_entry *dst, struct sock *sk,
                                            struct sk_buff *skb);
        int                     (*local_out)(struct sk_buff *skb);
        struct neighbour *      (*neigh_lookup)(const struct dst_entry *dst,
                                                struct sk_buff *skb,
                                                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, GFP_KERNEL);
}

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

#endif