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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/net/dst_ops.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef _NET_DST_OPS_H

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#define _NET_DST_OPS_H

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#include <linux/types.h>

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#include <linux/percpu_counter.h>

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#include <linux/cache.h>

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struct dst_entry;

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struct kmem_cachep;

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struct net_device;

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struct sk_buff;

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struct sock;

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struct net;

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struct dst_ops {

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	unsigned short		family;

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	unsigned int		gc_thresh;

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	void			(*gc)(struct dst_ops *ops);

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	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);

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	unsigned int		(*default_advmss)(const struct dst_entry *);

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	unsigned int		(*mtu)(const struct dst_entry *);

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	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);

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	void			(*destroy)(struct dst_entry *);

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	void			(*ifdown)(struct dst_entry *,

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					  struct net_device *dev);

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	void			(*negative_advice)(struct sock *sk, struct dst_entry *);

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	void			(*link_failure)(struct sk_buff *);

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	void			(*update_pmtu)(struct dst_entry *dst, struct sock *sk,

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					       struct sk_buff *skb, u32 mtu,

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					       bool confirm_neigh);

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	void			(*redirect)(struct dst_entry *dst, struct sock *sk,

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					    struct sk_buff *skb);

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	int			(*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);

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

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						struct sk_buff *skb,

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						const void *daddr);

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	void			(*confirm_neigh)(const struct dst_entry *dst,

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						 const void *daddr);

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	struct kmem_cache	*kmem_cachep;

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	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;

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};

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static inline int dst_entries_get_fast(struct dst_ops *dst)

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{

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	return percpu_counter_read_positive(&dst->pcpuc_entries);

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}

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static inline int dst_entries_get_slow(struct dst_ops *dst)

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{

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	return percpu_counter_sum_positive(&dst->pcpuc_entries);

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}

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#define DST_PERCPU_COUNTER_BATCH 32

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

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{

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	percpu_counter_add_batch(&dst->pcpuc_entries, val,

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				 DST_PERCPU_COUNTER_BATCH);

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}

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static inline int dst_entries_init(struct dst_ops *dst)

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{

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

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}

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static inline void dst_entries_destroy(struct dst_ops *dst)

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{

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	percpu_counter_destroy(&dst->pcpuc_entries);

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}

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#endif

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