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SubjectRe: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

On 25/07/2019 16:12, Jose Abreu wrote:
> From: Jon Hunter <>
> 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.



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