diff options
| author | Robert Hancock <hancockrwd@gmail.com> | 2010-02-20 02:10:15 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-20 02:10:15 +0100 |
| commit | 353176888386d9025062a12dcec08d49af10cf2c (patch) | |
| tree | 75ebc4c4a910f8187e784d75abf5f4be159011f7 /drivers/net/benet | |
| parent | mlx4: replace the dma_sync_single_range_for_cpu/device API (diff) | |
| download | linux-353176888386d9025062a12dcec08d49af10cf2c.tar.xz linux-353176888386d9025062a12dcec08d49af10cf2c.zip | |
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>
Diffstat (limited to 'drivers/net/benet')
0 files changed, 0 insertions, 0 deletions