linux-kernel - RE: [PATCH v2] net: add new QCA alx ethernet driver

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Date:	Thu, 23 Aug 2012 06:35:40 +0000
From:	"Huang, Xiong" <xiong@....qualcomm.com>
To:	David Miller <davem@...emloft.net>,
	"Ren, Cloud" <cjren@....qualcomm.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	qca-linux-team <qca-linux-team@...lcomm.com>,
	nic-devel <nic-devel@...lcomm.com>,
	"Rodriguez, Luis" <rodrigue@....qualcomm.com>
Subject: RE: [PATCH v2] net: add new QCA alx ethernet driver

> This is why we require that portable, sane, interfaces are added to ethtool for
> driver diagnostics.  That way users can perform a task in the same way
> regardless of what hardware and driver are underneath.

I quite agree you on using ethtool to implement it. we did consider it. 
But ethtool has some limitation, for example, the NIC has built-in OTP (TWSI interface)
And Flash (External SPI interface),  their properties are quite different with EEPROM which
Ethtool supports.
To support such memory (OTP/Flash), we need additional input parameters.

Same situation exists in diagnostic utility. Ethtool only provide two options : offline & online
That's too gross to locate which part/module of the chip is malfunction. we also need 
more options to detect it.

that's why we finally selected a custom debugfs interface. 

Thanks
Xiong

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