netdev - Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled

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Date:	Mon, 3 Oct 2011 17:53:58 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eli Cohen <eli@...lanox.co.il>,
	"eli@....mellanox.co.il" <eli@....mellanox.co.il>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is
 enabled

On Mon, Oct 03, 2011 at 02:56:08PM +0000, Yevgeny Petrilin wrote:
> > Hello, Yevgeny.
> > 
> > We use a MT26448 (lspci -v output bellow) on a POWER7. Any other
> > information, tests or debug patches you want me to try, just tell me.
> > 
> > I expected this was really not the proper fix, but thought it would be
> > better to send it than just guess. Any clues what the problem might be?
> > Perhaps, we would have to disable blue frame for this particular device?
> > 
> > Regards,
> > Cascardo.
> > 
> > ---
> > lspci output
> > 0006:01:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)
> > ---
> > lspci -v output
> > 0006:01:00.0 0200: 15b3:6750 (rev b0)
> >         Subsystem: 1014:0416
> >         Flags: bus master, fast devsel, latency 0, IRQ 31
> >         Memory at 3da47be00000 (64-bit, non-prefetchable) [size=1M]
> >         Memory at 3da47c000000 (64-bit, prefetchable) [size=32M]
> >         Expansion ROM at 3da47bf00000 [disabled] [size=1M]
> >         Capabilities: [40] Power Management version 3
> >         Capabilities: [48] Vital Product Data
> >         Capabilities: [9c] MSI-X: Enable+ Count=128 Masked-
> >         Capabilities: [60] Express Endpoint, MSI 00
> >         Capabilities: [100] Alternative Routing-ID Interpretation (ARI)
> >         Capabilities: [148] Device Serial Number 00-02-c9-03-00-0f-50-be
> >         Kernel driver in use: mlx4_core
> >         Kernel modules: mlx4_en, mlx4_core
> > ---
> 
> Cascardo,
> 
> Can you also send me the output of ethtool -i?
> It seems that there is a problem with write combining on Power processors, we will check this issue.
> 
> Yevgeny

Hello, Yevgeny.

You will find the output of ethtool -i below.

I am copying Ben and powerpc list, in case this is an issue with Power
processors. They can provide us some more insight into this.

Thanks,
Cascardo.

---
# ethtool -i eth10
driver: mlx4_en
version: 1.5.4.1 (March 2011)
firmware-version: 2.9.4130
bus-info: 0006:01:00.0
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