netdev - Re: [PATCH 1/5] net: Don't use ifindices in hash fns

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Date:	Mon, 06 Aug 2012 13:51:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	David Miller <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/5] net: Don't use ifindices in hash fns

On Mon, 2012-08-06 at 15:01 +0400, Pavel Emelyanov wrote:

> Damn :( You're right.
> 
> > This returns 0 as is
> 
> Well, on 64-bit no, but what it does is also not what it was supposed to.
> 

Here, my L1_CACHE_BYTES is 64, but whatever

> > I would define a generic pointer hash mix instead of a 'net_device
> > thing'
> > 
> > static inline u32 ptr_hash_mix(void *ptr)
> > {
> > #if BITS_PER_LONG==32
> > 	return (u32)(unsigned long)ptr;
> > #else
> > 	return (u32)((unsigned long)ptr >> L1_CACHE_SHIFT);
> > #endif
> > }
> 
> OK. It will also obsolete the net_hash_mix then. Any suggestions where to put
> the new one?

Not obsolete net_hash_mix(), since this one can return 0 if
CONFIG_NET_NS is not set.

static inline unsigned int net_hash_mix(struct net *net)
{
#ifdef CONFIG_NET_NS
	return ptr_hash_mix(net);
#else
	return 0;
#endif
}

I dont know, you could add this to include/linux/hash.h



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