netdev - zero copy with PACKET

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Message-ID: <CAGZFCEF0RB2eHOfgVCyjVDEc4S+jHsdJ+-iQdbC3zek7G5Ahcg@mail.gmail.com>
Date:	Thu, 27 Feb 2014 12:10:06 +0530
From:	ratheesh kannoth <ratheesh.ksz@...il.com>
To:	netdev@...r.kernel.org, linux-net@...r.kernel.org
Subject: zero copy with PACKET_MMAP

Hi ,

The link

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 ?

Thanks,
Ratheesh
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