linux-kernel - RE: [PATCH 3/3] dm9601: add support ethtool style utility

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Date:	Fri, 11 Mar 2016 19:08:57 +0800
From:	"Joseph Chang" <joseph_chang@...icom.com.tw>
To:	"'Ben Hutchings'" <ben@...adent.org.uk>,
	"'Joseph Chang'" <joseph_chang@...icom.com.tw>,
	"'Joseph CHANG'" <josright123@...il.com>,
	"'Peter Korsgaard'" <jacmet@...site.dk>, <netdev@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] dm9601: add support ethtool style utility

I tested by
 ./ethtool -E eth0 magic 0x9620 offset 0 length 3 value 0xf1 value 0xf2 value 0xf3

I think ethtool need [ value N ] for each byte (so need three "value xx" in above command line), 
am I right?

Oh, I can see it goes wrong~ Thanks~

* I will go a vacation from now on, this issue will be study later.
 Any helpful reference implementation data is appreciated. 
 
Best Regards,
Joseph CHANG
System Application Engineering Division
Davicom Semiconductor, Inc.
No. 6 Li-Hsin 6th Rd., Science-Based Park,
Hsin-Chu, Taiwan.
Tel: 886-3-5798797 Ex 8534
Fax: 886-3-5646929
Web: http://www.davicom.com.tw


-----Original Message-----
From: Ben Hutchings [mailto:ben@...adent.org.uk] 
Sent: Thursday, March 10, 2016 9:18 PM
To: Joseph Chang; 'Joseph CHANG'; 'Peter Korsgaard'; netdev@...r.kernel.org; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] dm9601: add support ethtool style utility

On Thu, 2016-03-10 at 20:51 +0800, Joseph Chang wrote:
> I did verify to dump EEPROM data and also write EEPROM by per byte.
> 
> 1.Plug dm9601/dm9621 adapter and has get dm9601.ko be 'insmod' to have 'eht0',
> 2.Run ethtool v3.7 (as attached executable file and it's help display.)
> 3. Commands:
>    ./ethtool -e eth0  (dump EEPROM data for all the .get_eeprom_len )
>    ./ethtool -E eth0 magic 0x9620 offset 0 value 0xf1  (write 0xf1 to eeprom byte0)
>    ./ethtool -E eth0 magic 0x9620 offset 1 value 0xf2  (write 0xf2 to eeprom byte1)
>    ./ethtool -E eth0 magic 0x9620 offset 2 value 0xf3  (write 0xf3 to eeprom byte2)
[...]

So you only tested writing 1 byte at a time.  Try again with 3 bytes
and you'll see how it goes wrong.

Ben.

-- 
Ben Hutchings
To err is human; to really foul things up requires a computer.