From 353176888386d9025062a12dcec08d49af10cf2c Mon Sep 17 00:00:00 2001
From: Robert Hancock <hancockrwd@gmail.com>
Date: Fri, 19 Feb 2010 17:10:15 -0800
Subject: [PATCH] r8169: enable 64-bit DMA by default for PCI Express devices
 (v2)

Currently use of 64-bit DMA is disabled in r8169 unless the user passes the
use_dac module option. This is reasonable for conventional PCI devices where
broken chipsets may not handle dual-address-cycle transfers properly for
32-bit slots and so this may not be safe. However, PCI Express should not have
this problem and not using 64-bit DMA results in DMA transfers needlessly using
the IOMMU or SWIOTLB. Set the use_dac module parameter to a new default value of
-1 which results in 64-bit DMA being enabled by default for PCI Express devices
only.

Signed-off-by: Robert Hancock <hancockrwd@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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