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

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Date:	Tue, 05 Jul 2011 08:21:15 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	victor@...iniac.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] packet: Add fanout support.

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.

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