From: Jose Abreu <Jose.Abreu@synopsys.com>
To: Robin Murphy <robin.murphy@arm.com>,
Jose Abreu <Jose.Abreu@synopsys.com>,
Jon Hunter <jonathanh@nvidia.com>, Lars Persson <lists@bofh.nu>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>
Cc: Joao Pinto <Joao.Pinto@synopsys.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David S . Miller" <davem@davemloft.net>,
Chen-Yu Tsai <wens@csie.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
linux-tegra <linux-tegra@vger.kernel.org>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
"linux-stm32@st-md-mailman.stormreply.com"
<linux-stm32@st-md-mailman.stormreply.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool
Date: Tue, 23 Jul 2019 11:22:40 +0000 [thread overview]
Message-ID: <BYAPR12MB32698DC13D8D531F3FDBAC5CD3C70@BYAPR12MB3269.namprd12.prod.outlook.com> (raw)
In-Reply-To: <6c769226-bdd9-6fe0-b96b-5a0d800fed24@arm.com>
From: Robin Murphy <robin.murphy@arm.com>
Date: Jul/23/2019, 11:29:28 (UTC+00:00)
> On 23/07/2019 11:07, Jose Abreu wrote:
> > From: Jon Hunter <jonathanh@nvidia.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
_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-07-23 11:23 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-03 10:37 [PATCH net-next 0/3] net: stmmac: Some performance improvements and a fix Jose Abreu
2019-07-03 10:37 ` [PATCH net-next 1/3] net: stmmac: Implement RX Coalesce Frames setting Jose Abreu
2019-07-03 20:41 ` Jakub Kicinski
2019-07-03 10:37 ` [PATCH net-next 2/3] net: stmmac: Fix descriptors address being in > 32 bits address space Jose Abreu
2019-07-03 10:37 ` [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool Jose Abreu
2019-07-03 10:40 ` Jose Abreu
2019-07-04 9:39 ` Jesper Dangaard Brouer
2019-07-04 14:45 ` Jose Abreu
2019-07-04 15:09 ` Jesper Dangaard Brouer
2019-07-04 15:18 ` Jose Abreu
2019-07-04 15:33 ` Jesper Dangaard Brouer
2019-07-04 9:48 ` Jesper Dangaard Brouer
2019-07-04 10:00 ` Jesper Dangaard Brouer
2019-07-04 10:13 ` Jose Abreu
2019-07-04 11:11 ` Ilias Apalodimas
2019-07-04 11:54 ` Jesper Dangaard Brouer
2019-07-04 12:04 ` Ilias Apalodimas
2019-07-04 12:59 ` Jose Abreu
2019-07-04 13:06 ` Ilias Apalodimas
2019-07-04 10:30 ` Ilias Apalodimas
2019-07-04 12:14 ` Arnd Bergmann
2019-07-04 12:49 ` Ilias Apalodimas
2019-07-17 18:58 ` Jon Hunter
2019-07-18 7:29 ` Jose Abreu
2019-07-18 7:48 ` Jose Abreu
2019-07-18 9:16 ` Jon Hunter
2019-07-19 7:51 ` Jose Abreu
2019-07-19 8:37 ` Jon Hunter
2019-07-19 8:44 ` Jose Abreu
2019-07-19 8:49 ` Jon Hunter
2019-07-19 10:25 ` Jose Abreu
2019-07-19 12:28 ` Jose Abreu
2019-07-19 13:33 ` Jon Hunter
2019-07-19 12:30 ` Jon Hunter
2019-07-19 12:32 ` Jose Abreu
[not found] ` <25512348-5b98-aeb7-a6fb-f90376e66a84@nvidia.com>
2019-07-22 7:23 ` Jose Abreu
2019-07-22 9:37 ` Jon Hunter
2019-07-22 9:47 ` Jose Abreu
2019-07-22 9:57 ` Jose Abreu
2019-07-22 10:27 ` Jon Hunter
2019-07-22 10:18 ` Ilias Apalodimas
2019-07-22 11:11 ` Lars Persson
2019-07-22 11:39 ` Jose Abreu
2019-07-22 12:05 ` Jon Hunter
2019-07-22 14:04 ` Jose Abreu
2019-07-23 8:14 ` Jose Abreu
2019-07-23 10:01 ` Jon Hunter
2019-07-23 10:07 ` Jose Abreu
2019-07-23 10:29 ` Robin Murphy
2019-07-23 11:22 ` Jose Abreu [this message]
2019-07-23 12:09 ` Jon Hunter
2019-07-23 13:19 ` Robin Murphy
2019-07-23 21:39 ` Jon Hunter
2019-07-24 10:03 ` Robin Murphy
2019-07-23 18:51 ` David Miller
2019-07-24 8:54 ` Ilias Apalodimas
2019-07-24 9:43 ` Jose Abreu
2019-07-24 9:53 ` Ilias Apalodimas
2019-07-24 10:04 ` Jose Abreu
2019-07-24 11:10 ` Jon Hunter
2019-07-24 11:34 ` Jose Abreu
2019-07-24 11:58 ` Jon Hunter
2019-07-25 7:44 ` Jose Abreu
2019-07-25 9:45 ` Jon Hunter
2019-07-25 11:39 ` Ilias Apalodimas
2019-07-23 10:38 ` Jon Hunter
2019-07-23 10:49 ` Jose Abreu
2019-07-23 11:58 ` Jon Hunter
2019-07-23 12:51 ` Jose Abreu
2019-07-23 13:34 ` Jon Hunter
2019-07-29 9:45 ` Mikko Perttunen
2019-07-25 13:20 ` Jon Hunter
2019-07-25 13:26 ` Jose Abreu
2019-07-25 14:25 ` Jon Hunter
2019-07-25 15:12 ` Jose Abreu
2019-07-26 14:11 ` Jon Hunter
2019-07-27 15:56 ` Jose Abreu
2019-07-29 8:16 ` Jose Abreu
2019-07-29 10:55 ` Jon Hunter
2019-07-29 11:29 ` Jose Abreu
2019-07-29 11:52 ` Robin Murphy
2019-07-29 14:08 ` Jose Abreu
2019-07-29 21:33 ` Jon Hunter
2019-07-30 9:39 ` Jose Abreu
2019-07-30 13:36 ` Jon Hunter
2019-07-30 13:58 ` Jose Abreu
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