Re: [PATCH net-next V2] gro: introduce gro_mac_header_len

From: Roland Dreier <redacted>
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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