netdev - Re: sky2 rx length errors

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Message-ID: <20090920110527.39fd7af5@s6510>
Date:	Sun, 20 Sep 2009 11:05:27 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Grozdan <neutrino8@...il.com>, linux-kernel@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: sky2 rx length errors

On Sat, 19 Sep 2009 23:35:36 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> (added cc's from the MAINTAINERS file)
> 
> On Fri, 18 Sep 2009 15:41:45 +0200 Grozdan <neutrino8@...il.com> wrote:
> 
> > Hi,
> > 
> > I have a Marvell onboard NIC (88E8053) and I've been noticing for a
> > while now a bit weird behavior with the sky2 driver. This mostly
> > occurs with newer kernels (2.6.30, 2.6.31) and my older distro kernel
> > (2.6.27.21) does not seem to have the same problem. Basically, the
> > sky2 driver will randomly and unpredictably spew rx length error
> > messages and reboot itself. I also noticed in dmesg that this mostly
> > occurs after "martian destination" messages. After this message, sky2
> > starts spewing messages as shown below and then reboots itself. It is
> > not really a big problem for me, but since I'm virtually always logged
> > in in IRC, the client always loses connection, waits for a few minutes
> > to get a response from the server and then relogs me again. I do not
> > think it's a HW problem as the Marvell NIC otherwise works perfectly
> > and I've checked my cable modem too which operates without a problem.
> > Any ideas?
> > 
> > PS: please cc me as I'm not subscribed to the mailing list
> > 
> > sky2 driver version 1.23
> > sky2 0000:05:00.0: PCI INT A -> GSI 36 (level, low) -> IRQ 36
> > sky2 0000:05:00.0: setting latency timer to 64
> > sky2 0000:05:00.0: PCI: Disallowing DAC for device
> > sky2 0000:05:00.0: Yukon-2 EC chip revision 2
> > sky2 0000:05:00.0: irq 53 for MSI/MSI-X
> > sky2 0000:05:00.0: No interrupt generated using MSI, switching to INTx mode.
> > sky2 eth0: addr 00:11:d8:a1:5b:0e
> > sky2 eth0: enabling interface
> > sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
> > .....
> > .....
> > martian destination 0.0.0.0 from 172.23.204.1, dev eth0
> > sky2 eth0: rx length error: status 0x4420100 length 598
> > sky2 eth0: rx length error: status 0x5ea0100 length 598

This error status occurs if the length reported by the PHY does not
match the len reported by the DMA engine.  The error status is:
   0x4420100 = length 1090 + broadcast packet...

No idea what is on your network, but perhaps there is some MTU confusion?
Since martian destination seems related, knowing more about that packet
might help.
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