linux-kernel - Re: net: skge breakage on 2.6.24-rc1

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Date:	Wed, 7 Nov 2007 23:50:30 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Heikki Orsila <shdl@...alwe.fi>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: net: skge breakage on 2.6.24-rc1

On Wednesday, 7 of November 2007, Heikki Orsila wrote:
> On Wed, Nov 07, 2007 at 11:46:21PM +0200, Heikki Orsila wrote:
> > After some bisecting, I found that net skge driver broke on
> > 
> > commit 7fb7ac241162dc51ec0f7644d4a97b2855213c32
> > 
> > My network card is:
> > 
> > 0000:00:0e.0 Ethernet controller: 3Com Corporation 3c940 10/100/1000Base-T [Marvell] (rev 12)
> > 
> > Linux cheradenine 2.6.24-rc1-dirty #15 Wed Nov 7 23:39:28 EET 2007 x86_64 GNU/Linux
> 
> Sorry, forgot to say what the problem is. Doing
> 
> 	nc host port < /dev/zero
> 
> on a sending machine (not skge) to an skge machine that is receiving:
> 
> 	nc -l -p port >/dev/null
> 
> with ~60 MiB/s speed, causes the interface go malfunct. A slow 
> transfer doesn't cause a problem.
> 
> Also, after some fiddling, I noticed that not changing the register 
> write order on patch:
> 
> +       skge_write32(hw, RB_ADDR(q, RB_END), end);
>         skge_write32(hw, RB_ADDR(q, RB_WP), start);
>         skge_write32(hw, RB_ADDR(q, RB_RP), start);
> -       skge_write32(hw, RB_ADDR(q, RB_END), end);
> 
> fixes the visible effect.. Possibly not the root cause of the problem, 
> but changing the order back fixes networking here.

Please put all of the relevant information into the bugzilla entry at
http://bugzilla.kernel.org/show_bug.cgi?id=9321

Thanks,
Rafael
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