linux-kernel - Re: sky2 PHY setup

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Date:	Fri, 16 Mar 2007 14:16:48 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Rob Sims <lkml-z@...sims.com>
Cc:	Thomas Glanzmann <thomas@...nzmann.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andreas Allgöwer <andreas.allgoewer@....de>,
	Michael Gernoth <simigern@....informatik.uni-erlangen.de>
Subject: Re: sky2 PHY setup

On Fri, 16 Mar 2007 14:36:45 -0600
Rob Sims <lkml-z@...sims.com> wrote:

> On Fri, Mar 16, 2007 at 09:59:32AM -0700, Stephen Hemminger wrote:
> > On Fri, 16 Mar 2007 01:29:12 +0100
> > Thomas Glanzmann <thomas@...nzmann.de> wrote:
> > 
> > > Hello Stephen,
> > > 
> > > > yesterday I pulled from Linus tree because I saw the sky2 updated and I
> > > > tried to break it but it seems that my problems are gone. I let you know
> > > > if anything pops up in the future.
> > > 
> > > bad news. I today tried the sky2 driver which is in Linus Kernel Tree
> > > (HEAD) on a machine with very high network load and it stopped working
> > > without any kernel messages after doing a flawless job under high load
> > > for 5 hours. My watchdog rebooted the machine after 500 seconds. ;-(
> > > 
> > >         Thomas
> > 
> > I have run for 2+ days under load without problems. It is hard to
> > reproduce or do much about your problem without more info.
> 
> Are there some debug hooks that can be activated?  My sky2 stops
> responding (very light load) about twice a day.  The netdev watchdog
> notices after a while and is able to reactivate the interface:
> 
> Mar 15 13:28:12 btd kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Mar 15 13:28:12 btd kernel: sky2 eth0: tx timeout
> Mar 15 13:28:12 btd kernel: sky2 eth0: transmit ring 458 .. 435 report=458 done=458
> Mar 15 13:28:12 btd kernel: sky2 eth0: disabling interface
> Mar 15 13:28:12 btd kernel: sky2 eth0: enabling interface
> Mar 15 13:28:12 btd kernel: sky2 eth0: ram buffer 48K
> Mar 15 13:28:15 btd kernel: sky2 eth0: Link is up at 1000 Mbps, full duplex, flow control both

Use ethtool -S to if there are any pause frames, etc. See if frames are
still making it into PHY statistics but not being received.

Use ethtool -d to dump registers. Need current version of ethtool with decode logic.

Then look for things like is Ram buffer read/write pointer changing?

Is GMAC stuck in pause:

Normal is:
	GMAC 1
	Status                       0x5010  (see GM_GPSR_XXX in sky2.h)
	Control                      0x1800

Stuck is
	GMAC 1
	Status			     0x5810 (or 0x5A10)

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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