netdev - Re: sky2: hw csum failure

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Date:	Mon, 28 Nov 2011 19:20:45 +0000
From:	Vincent Blut <vincent.debian@...e.fr>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	netdev@...r.kernel.org,
	Debian Bug Tracking System <609994@...s.debian.org>
Subject: Re: sky2: hw csum failure

Le 28/11/2011 16:50, Stephen Hemminger a écrit :
> On Mon, 28 Nov 2011 12:10:20 +0000
> Vincent Blut <vincent.debian@...e.fr> wrote:
>
>   
>> Hi,
>>
>> [reference: http://bugs.debian.org/609994]
>>
>> I have a Marvell ethernet controller which presents some failures when
>> 'rx checksumming' is enabled,
>> here is the model:
>>
>> $ lspci -vvs 03:00.0
>> 03:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E
>> Gigabit Ethernet Controller (rev 15)
>>         Subsystem: Micro-Star International Co., Ltd. Marvell 88E8053
>> Gigabit Ethernet Controller (MSI)
>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
>> ParErr- Stepping- SERR- FastB2B- DisINTx+
>>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
>> <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 0, Cache Line Size: 32 bytes
>>         Interrupt: pin A routed to IRQ 44
>>         Region 0: Memory at fdbfc000 (64-bit, non-prefetchable) [size=16K]
>>         Region 2: I/O ports at 7c00 [size=256]
>>         [virtual] Expansion ROM at fda00000 [disabled] [size=128K]
>>         Capabilities: <access denied>
>>         Kernel driver in use: sky2
>>
>> At first I thought it was due to the MTU size, so I tested different
>> values but unfortunately without positive effect.
>> Overall this issue appears randomly when the incoming traffic is high. I
>> tested 2.6.32, 3.1.1, and 3.2-rc3, sadly
>> all are affected. Finally, the only way to avoid those failures is to
>> disabled 'rx checksumming' (ethtool -K ethX rx off).
>>
>> Here is the stack trace:
>>
>> [   14.615648] sky2 0000:03:00.0: eth1: enabling interface
>> [   14.616452] ADDRCONF(NETDEV_UP): eth1: link is not ready
>> [   17.094194] sky2 0000:03:00.0: eth1: Link is up at 1000 Mbps, full
>> duplex, flow control both
>> [   17.094887] ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
>> [   28.080018] eth1: no IPv6 routers present
>> [  563.816032] sky2 0000:03:00.0: eth1: hung mac 124:22 fifo 195 (150:145)
>> [  563.816036] sky2 0000:03:00.0: eth1: receiver hang detected
>> [  567.005422] sky2 0000:03:00.0: eth1: Link is up at 1000 Mbps, full
>> duplex, flow control both
>> [ 1040.816314] sky2 0000:03:00.0: eth1: rx error, status 0x7ffc0001
>> length 1004
>> [ 2097.401616] sky2 0000:03:00.0: eth1: rx error, status 0x39a339a3 length 0
>>     
> This isn't really a hardware checksum failure.
> Your problem is deeper than that. The internal parts of the chip are not
> communicating correctly. The "hung mac" is a problem only occurs if the PCI
> is really stuck. There may be a timing issue on your motherboard, or the BIOS
> isn't setting up the device properly. The timing then gets messed up between
> the end of frame status and the PCI shared memory region. Turning checksum
> off masks the problem, but the status is probably still corrupt.
>
>   

IMO, turning checksum off does more than masking the problem because it
prevents the
connection to stop working or even freeze the system.

> In either case the problem is beyond the ability of the driver to fix or workaround.
> Your best bet is to see if there is a BIOS update, or replace the hardware.
>   

Sadly the last BIOS update was in 2006, so I don't think I can rely on
the manufacturer.
But again, deactivate the capability of checksum by NIC hardware makes
the interface stable since March.

Regards,
Vincent

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