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78d7942317
Lot of routers/embedded devices still use CPUS with 16/32 bytes cache lines. (486, Pentium, ... PIII) It makes sense to group together fields used at lookup time so they fit in one cache line. This reduce cache footprint and speedup lookups. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* INETPEER - A storage for permanent information about peers
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*
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* Version: $Id: inetpeer.h,v 1.2 2002/01/12 07:54:56 davem Exp $
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*
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* Authors: Andrey V. Savochkin <saw@msu.ru>
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*/
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#ifndef _NET_INETPEER_H
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#define _NET_INETPEER_H
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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struct inet_peer
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{
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/* group together avl_left,avl_right,v4daddr to speedup lookups */
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struct inet_peer *avl_left, *avl_right;
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__be32 v4daddr; /* peer's address */
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__u16 avl_height;
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__u16 ip_id_count; /* IP ID for the next packet */
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struct inet_peer *unused_next, **unused_prevp;
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__u32 dtime; /* the time of last use of not
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* referenced entries */
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atomic_t refcnt;
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atomic_t rid; /* Frag reception counter */
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__u32 tcp_ts;
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unsigned long tcp_ts_stamp;
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};
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void inet_initpeers(void) __init;
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/* can be called with or without local BH being disabled */
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struct inet_peer *inet_getpeer(__be32 daddr, int create);
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/* can be called from BH context or outside */
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extern void inet_putpeer(struct inet_peer *p);
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extern spinlock_t inet_peer_idlock;
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/* can be called with or without local BH being disabled */
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static inline __u16 inet_getid(struct inet_peer *p, int more)
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{
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__u16 id;
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spin_lock_bh(&inet_peer_idlock);
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id = p->ip_id_count;
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p->ip_id_count += 1 + more;
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spin_unlock_bh(&inet_peer_idlock);
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return id;
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}
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#endif /* _NET_INETPEER_H */
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