From: mailinglists@erwinrol•com (Erwin Rol)
To: linux-arm-kernel@lists•infradead.org
Subject: at91sam9260 MACB problem with IP fragmentation
Date: Thu, 20 Dec 2012 10:17:49 +0100 [thread overview]
Message-ID: <50D2D7BD.3030801@erwinrol.com> (raw)
In-Reply-To: <50C09D2E.8050608@atmel.com>
Hallo Nicolas,
On 6-12-2012 14:27, Nicolas Ferre wrote:
> Erwin,
>
> On 12/06/2012 12:32 PM, Erwin Rol :
>> Hello Nicolas, Havard, all,
>>
>> I have a very obscure problem with a at91sam9260 board (almost 1 to 1
>> copy of the Atmel EK).
>>
>> The MACB seems to stall when I use large (>2 * MTU) UDP datagrams. The
>> test case is that a udp echo client (PC) sends datagrams with increasing
>> length to the AT91 until the max length of the UDP datagram is reached.
>> When there is no IP fragmentation everything is fine, but when the
>> datagrams are starting to get fragmented the AT91 will not reply
>> anymore. But as soon as some network traffic happens it goes on again,
>> and non of the data is lost.
<snip>
>> I tried several kernels including the test version from Nicolas that he
>> posted on LKML in October. They all show the same effect.
>
> [..]
>
> It seems that Matteo has the same behavior: check here:
> http://www.spinics.net/lists/netdev/msg218951.html
I tried Matteo's patch and it seems to work. But I don't know if the
patch is really the right solution. I checked again with wireshark and
it really seems the sending that stalls not the receiving. But as soon
as a ethernet frame is received the sending "un-stalls". So maybe the
patch just causes an MACB IRQ at certain moments that causes the sending
to continue?
> I am working on the macb driver right now, so I will try to reproduce
> and track this issue on my side.
Any luck reproducing it ?
- Erwin
next prev parent reply other threads:[~2012-12-20 9:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <50C08233.9030905@erwinrol.com>
2012-12-06 13:27 ` at91sam9260 MACB problem with IP fragmentation Nicolas Ferre
2012-12-06 15:15 ` Erwin Rol
2012-12-20 9:17 ` Erwin Rol [this message]
2012-12-20 17:51 ` Nicolas Ferre
2013-02-12 10:08 ` [PATCH] net/macb: fix race with RX interrupt while doing NAPI Nicolas Ferre
2013-02-13 18:36 ` David Miller
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