netdev - e1000: convert to build_skb/napi_gro

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Date:	Sat, 30 Aug 2014 20:28:20 +0200
From:	Florian Westphal <fw@...len.de>
To:	e1000-devel@...ts.sourceforge.net
Cc:	netdev@...r.kernel.org
Subject: e1000: convert to build_skb/napi_gro_frags api

e1000 driver preallocates skbs, then sends them up the stack.

This series changes the rx routine to only preallocate data buffers,
then initialize skb right before passing it up the stack.

This gives slight performance inprovements as the skb will be
fresh in the cache once its allocated/initialized.

The default-mtu 1500 path is converted to build_skb()/netdev_alloc_frag.

Jumbo path is converted to napi_gro_frags.

Note that this has only been tested with kvms e1000 emulation.
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