linux-kernel - RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Message-ID: <BYAPR12MB3269B4A401E4DA10A07515C7D3C10@BYAPR12MB3269.namprd12.prod.outlook.com>
Date:   Thu, 25 Jul 2019 15:12:44 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Jon Hunter <jonathanh@...dia.com>,
        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>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Robin Murphy <robin.murphy@....com>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

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.

You do have flow control active right ? And your HW FIFO size is >= 4k ?

---
Thanks,
Jose Miguel Abreu