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

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Date:   Tue, 23 Jul 2019 11:22:40 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Robin Murphy <robin.murphy@....com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Lars Persson <lists@...h.nu>,
        "Ilias Apalodimas" <ilias.apalodimas@...aro.org>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.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>,
        "David S . Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

From: Robin Murphy <robin.murphy@....com>
Date: Jul/23/2019, 11:29:28 (UTC+00:00)

> On 23/07/2019 11:07, Jose Abreu wrote:
> > From: Jon Hunter <jonathanh@...dia.com>
> > Date: Jul/23/2019, 11:01:24 (UTC+00:00)
> > 
> >> This appears to be a winner and by disabling the SMMU for the ethernet
> >> controller and reverting commit 954a03be033c7cef80ddc232e7cbdb17df735663
> >> this worked! So yes appears to be related to the SMMU being enabled. We
> >> had to enable the SMMU for ethernet recently due to commit
> >> 954a03be033c7cef80ddc232e7cbdb17df735663.
> > 
> > Finally :)
> > 
> > However, from "git show 954a03be033c7cef80ddc232e7cbdb17df735663":
> > 
> > +         There are few reasons to allow unmatched stream bypass, and
> > +         even fewer good ones.  If saying YES here breaks your board
> > +         you should work on fixing your board.
> > 
> > So, how can we fix this ? Is your ethernet DT node marked as
> > "dma-coherent;" ?
> 
> The first thing to try would be booting the failing setup with 
> "iommu.passthrough=1" (or using CONFIG_IOMMU_DEFAULT_PASSTHROUGH) - if 
> that makes things seem OK, then the problem is likely related to address 
> translation; if not, then it's probably time to start looking at nasties 
> like coherency and ordering, although in principle I wouldn't expect the 
> SMMU to have too much impact there.
> 
> Do you know if the SMMU interrupts are working correctly? If not, it's 
> possible that an incorrect address or mapping direction could lead to 
> the DMA transaction just being silently terminated without any fault 
> indication, which generally presents as inexplicable weirdness (I've 
> certainly seen that on another platform with the mix of an unsupported 
> interrupt controller and an 'imperfect' ethernet driver).
> 
> Just to confirm, has the original patch been tested with 
> CONFIG_DMA_API_DEBUG to rule out any high-level mishaps?

Yes but both my setups don't have any IOMMU: One is x86 + SWIOTLB and 
another is just coherent regarding CPU.

---
Thanks,
Jose Miguel Abreu