linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

#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 net;

​

struct dst_ops {

    unsigned short      family;

    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 net *net, struct sock *sk, struct sk_buff *skb);

    struct neighbour *  (*neigh_lookup)(const struct dst_entry *dst,

                        struct sk_buff *skb,

                        const void *daddr);

    void            (*confirm_neigh)(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)

{

    return percpu_counter_sum_positive(&dst->pcpuc_entries);

}

​

static inline void dst_entries_add(struct dst_ops *dst, int val)

{

    percpu_counter_add(&dst->pcpuc_entries, val);

}

​

static inline int dst_entries_init(struct dst_ops *dst)

{

    return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);

}