linux-kernel - Re: [Regression] r8169: enable 64-bit DMA by default for PCI Express devices (v2)

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Message-ID: <51f3faa71003151628g5edc4d7av8916ac76cb337bfe@mail.gmail.com>
Date:	Mon, 15 Mar 2010 17:28:45 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	joern@...lin.logfs.org, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	romieu@...zoreil.com
Subject: Re: [Regression] r8169: enable 64-bit DMA by default for PCI Express 
	devices (v2)

On Mon, Mar 15, 2010 at 12:57 PM, David Miller <davem@...emloft.net> wrote:
> From: Jörn Engel <joern@...lin.logfs.org>
> Date: Mon, 15 Mar 2010 16:10:41 +0100
>
>> Forgot to Cc: lkml.
>
> Actually, what you really need to CC: is netdev, added.
>> On Mon, 15 March 2010 16:08:06 +0100, J�rn Engel wrote:
>>>
>>> Hello Robert!
>>>
>>> Looks like 353176888386d9025062a12dcec08d49af10cf2c broke one of my
>>> machines.  Reverting that patch fixes things again.  Machine is
>>> running an x86_64 kernel.  Lspci gives me this:
>>>
>>> 01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
>>>         Subsystem: ASRock Incorporation Device 8136
>>>         Flags: bus master, fast devsel, latency 0, IRQ 26
>>>         I/O ports at e800 [size=256]
>>>         Memory at fdeff000 (64-bit, prefetchable) [size=4K]
>>>         Memory at fdee0000 (64-bit, prefetchable) [size=64K]
>>>         [virtual] Expansion ROM at fde00000 [disabled] [size=128K]
>>>         Capabilities: [40] Power Management version 3
>>>         Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
>>>         Capabilities: [70] Express Endpoint, MSI 01
>>>         Capabilities: [ac] MSI-X: Enable- Count=2 Masked-
>>>         Capabilities: [cc] Vital Product Data
>>>         Capabilities: [100] Advanced Error Reporting
>>>         Capabilities: [140] Virtual Channel <?>
>>>         Capabilities: [160] Device Serial Number 08-00-00-00-ff-ff-00-00
>>>         Kernel driver in use: r8169
>>>
>>> If you have any test patches to try, please send them my way. :)
>>>
>>> J�rn
>

What are the symptoms? Does setting use_dac=0 in the module options
for r8169 also resolve the problem?

Full dmesg and lspci -vv output might also be useful.
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