linux-kernel - Re: [linux-usb-devel] [PATCH] driver for mcs7830 (aka DeLOCK) USB ethernet adapter

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Message-Id: <200609021951.40470.arnd@arndb.de>
Date:	Sat, 2 Sep 2006 19:51:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-usb-devel@...ts.sourceforge.net,
	David Hollis <dhollis@...ehollis.com>, support@...chip.com,
	dbrownell@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
	Michael Helmling <supermihi@....de>
Subject: Re: [linux-usb-devel] [PATCH] driver for mcs7830 (aka DeLOCK) USB ethernet adapter

On Saturday 02 September 2006 12:38, David Brownell wrote:
> > 
> > It has been tested successfully on an OHCI, but interestingly
> > there seems to be a problem with the mcs7830 when connected to
> > the ICH6/EHCI in my thinkpad: it keeps receiving lots of
> > broken packets in the RX interrupt.
> 
> That is, the "status" polling which you disabled??  If so, please
> update this comment ...

No, the receive errors are independent from the status interrupt.
I have now got confirmation by another user that they also
happen on a different thinkpad when not using a USB hub, but
with a hub everything seems fine.

> > The problem goes away when 
> > I'm using an active USB hub, so I assume it's not related to
> > the device driver, but rather to the hardware.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> Looks basically OK to me, although I'd rather see the two patches
> you posted on 27-August be merged into it before an upstream merge.
> (To use normal MII constants, and handle max size frames.)

Ok, I can resend.

> > This version incorporates a few cleanups from myself an changes
> > based on comments from David Hollis. 
> 
> He has more experience than I do with respect to these sorts of
> real Ethernet adapters and usbnet.  :)
> 
> Speaking of which ... isnt this driver missing a hook to make
> the MII stuff visible through ethtool?

hmm, I wasn't aware that ethtool does this. I did check that mii-tool
works though.

Going through the ethtool operations, I think that it should be
possible to implement a few of them, including ETHTOOL_GREGS,
ETHTOOL_GEEPROM, ETHTOOL_SEEPROM, ETHTOOL_NWAY_RST and ETHTOOL_GPERMADDR.
Do you think these should be done?

	Arnd <><

-- 
VGER BF report: U 0.49989
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