netdev - Misuse of LRO, how widespread

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Message-ID: <20101206121829.5b8c852e@nehalam>
Date:	Mon, 6 Dec 2010 12:18:29 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>,
	Olof Johansson <olof@...om.net>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Divy Le Ray <divy@...lsio.com>
Cc:	netdev@...r.kernel.org
Subject: Misuse of LRO, how widespread

I inspected all drivers in net-next to see which drivers are using
LRO and which ones are broken. Most concerning is that Chelsio
and Solarflare drivers ignore ETH_FLAG_LRO.

The ones that are using LRO but allow disabling it:
  qlcnic, netxen, mv643, s2io, myi10ge, bnx2x, ixgbe, vmxnet3

One driver seems confused about LRO vs GRO:
  mlx4 - comments about LRO and depends on LRO but driver is using GRO

Drivers with not using ethtool interface to disable LRO:
  pasemi_mac, sfc, ehea, cxgb3, cxgb4

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