0b4419162a
There are many possible ways to add this "salt", thus I made this patch to be the last in the series to change it if required. Currently I propose to use the struct net pointer itself as this salt, but since this pointer is most often cache-line aligned, shift this right to eliminate the bits, that are most often zeroed. After this, simply add this mix to prepared hashfn-s. For CONFIG_NET_NS=n case this salt is 0 and no changes in hashfn appear. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
22 lines
336 B
C
22 lines
336 B
C
#ifndef __NET_NS_HASH_H__
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#define __NET_NS_HASH_H__
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#include <asm/cache.h>
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struct net;
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static inline unsigned net_hash_mix(struct net *net)
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{
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#ifdef CONFIG_NET_NS
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/*
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* shift this right to eliminate bits, that are
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* always zeroed
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*/
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return (unsigned)(((unsigned long)net) >> L1_CACHE_SHIFT);
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#else
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return 0;
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#endif
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}
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#endif
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