netdev - Re: zero copy with PACKET

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Message-ID: <530F0C46.5040208@redhat.com>
Date:	Thu, 27 Feb 2014 10:58:30 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	ratheesh kannoth <ratheesh.ksz@...il.com>
CC:	netdev@...r.kernel.org, linux-net@...r.kernel.org
Subject: Re: zero copy with PACKET_MMAP

On 02/27/2014 07:40 AM, ratheesh kannoth wrote:
...
> https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
> talks about  achieving zero copy. But i find a deep  packet copy ( of
> length snaplen= skb->len )  here
> http://lxr.free-electrons.com/source/net/packet/af_packet.c#L1841.
>
> Is there anything missing/wrong in my understanding ?

The zero-copy is between user and kernel space.
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