netdev - Re: [PATCH 2/2] packet: Add fanout support.

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Message-ID: <4E12B5A6.2020802@inliniac.net>
Date:	Tue, 05 Jul 2011 08:56:38 +0200
From:	Victor Julien <victor@...iniac.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] packet: Add fanout support.

On 07/05/2011 08:21 AM, Eric Dumazet wrote:
> Le lundi 04 juillet 2011 à 21:20 -0700, David Miller a écrit :
>> Fanouts allow packet capturing to be demuxed to a set of AF_PACKET
>> sockets.  Two fanout policies are implemented:
>>
>> 1) Hashing based upon skb->rxhash
> 
> ...
> 
>> +
>> +static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb)
>> +{
>> +	u32 idx, hash = skb->rxhash;
>> +
>> +	idx = ((u64)hash * f->num_members) >> 32;
>> +
>> +	return f->arr[idx];
>> +}
>> +
> 
> rxhash is 0 unless skb_get_rxhash() was called, or some NIC set it in RX
> path.
> 

Is this still also true for IP fragments?

-- 
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Victor Julien
http://www.inliniac.net/
PGP: http://www.inliniac.net/victorjulien.asc
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