netdev - Re: [PATCH net-next V2] gro: introduce gro_mac_header

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Message-Id: <20120206.143230.1415707004934341114.davem@davemloft.net>
Date:	Mon, 06 Feb 2012 14:32:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	roland@...nel.org
Cc:	eric.dumazet@...il.com, ogerlitz@...lanox.com,
	sean.hefty@...el.com, herbert@...dor.hengli.com.au,
	linux-rdma@...r.kernel.org, shlomop@...lanox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next V2] gro: introduce gro_mac_header_len

From: Roland Dreier <roland@...nel.org>
Date: Mon, 6 Feb 2012 11:23:21 -0800

> Does the netdev driver own skb->cb between hard_header
> and start_xmit?  If so we could use that instead of stealing
> some header space, and that would at least let us not lie
> about hard_header_len.

Unfortunately the packet scheduler sits between the hard_header()
call (via neigh_*_output() --> dev_hard_header()) and when the
device xmit method is invoked.

And the packet scheduler can make use of the skb->cb[], for
include/net/sch_generic.h:qdisc_skb_cb


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