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Message-ID: <1e2ea942-28fe-15b9-f675-8d6585f9a33f@nvidia.com>
Date: Fri, 26 Jul 2019 15:11:00 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Jose Abreu <Jose.Abreu@...opsys.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-stm32@...md-mailman.stormreply.com"
<linux-stm32@...md-mailman.stormreply.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
CC: Joao Pinto <Joao.Pinto@...opsys.com>,
Alexandre Torgue <alexandre.torgue@...com>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Chen-Yu Tsai <wens@...e.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
linux-tegra <linux-tegra@...r.kernel.org>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Robin Murphy <robin.murphy@....com>,
"David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
Pool
On 25/07/2019 16:12, Jose Abreu wrote:
> From: Jon Hunter <jonathanh@...dia.com>
> Date: Jul/25/2019, 15:25:59 (UTC+00:00)
>
>>
>> On 25/07/2019 14:26, Jose Abreu wrote:
>>
>> ...
>>
>>> Well, I wasn't expecting that :/
>>>
>>> Per documentation of barriers I think we should set descriptor fields
>>> and then barrier and finally ownership to HW so that remaining fields
>>> are coherent before owner is set.
>>>
>>> Anyway, can you also add a dma_rmb() after the call to
>>> stmmac_rx_status() ?
>>
>> Yes. I removed the debug print added the barrier, but that did not help.
>
> So, I was finally able to setup NFS using your replicated setup and I
> can't see the issue :(
>
> The only difference I have from yours is that I'm using TCP in NFS
> whilst you (I believe from the logs), use UDP.
So I tried TCP by setting the kernel boot params to 'nfsvers=3' and
'proto=tcp' and this does appear to be more stable, but not 100% stable.
It still appears to fail in the same place about 50% of the time.
> You do have flow control active right ? And your HW FIFO size is >= 4k ?
How can I verify if flow control is active?
The documentation for this device indicates a max transfer size of 16kB
for TX and RX.
Cheers
Jon
--
nvpublic
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