From: Jose Abreu <Jose.Abreu@synopsys.com>
To: Jon Hunter <jonathanh@nvidia.com>,
Jose Abreu <Jose.Abreu@synopsys.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"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>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Cc: Joao Pinto <Joao.Pinto@synopsys.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Maxime Ripard <maxime.ripard@bootlin.com>,
"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>,
Robin Murphy <robin.murphy@arm.com>,
"David S . Miller" <davem@davemloft.net>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool
Date: Mon, 29 Jul 2019 11:29:08 +0000 [thread overview]
Message-ID: <MN2PR12MB327997BDF2EA5CEE00F45AC3D3DD0@MN2PR12MB3279.namprd12.prod.outlook.com> (raw)
In-Reply-To: <b99b1e49-0cbc-2c66-6325-50fa6f263d91@nvidia.com>
++ Catalin, Will (ARM64 Maintainers)
From: Jon Hunter <jonathanh@nvidia.com>
Date: Jul/29/2019, 11:55:18 (UTC+00:00)
>
> On 29/07/2019 09:16, Jose Abreu wrote:
> > From: Jose Abreu <joabreu@synopsys.com>
> > Date: Jul/27/2019, 16:56:37 (UTC+00:00)
> >
> >> From: Jon Hunter <jonathanh@nvidia.com>
> >> Date: Jul/26/2019, 15:11:00 (UTC+00:00)
> >>
> >>>
> >>> On 25/07/2019 16:12, Jose Abreu wrote:
> >>>> From: Jon Hunter <jonathanh@nvidia.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?
> >>
> >> You can check it by dumping register MTL_RxQ_Operation_Mode (0xd30).
>
> Where would be the appropriate place to dump this? After probe? Maybe
> best if you can share a code snippet of where to dump this.
>
> >> Can you also add IOMMU debug in file "drivers/iommu/iommu.c" ?
>
> You can find a boot log here:
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__paste.ubuntu.com_p_qtRqtYKHGF_&d=DwICaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=NrxsR2etpZHGb7HkN4XdgaGmKM1XYyldihNPL6qVSv0&s=CMATEcHVoqZw4sIrNOXc7SFE_kV_5CO5EU21-yJez6c&e=
>
> > And, please try attached debug patch.
>
> With this patch it appears to boot fine. So far no issues seen.
Thank you for testing.
Hi Catalin and Will,
Sorry to add you in such a long thread but we are seeing a DMA issue
with stmmac driver in an ARM64 platform with IOMMU enabled.
The issue seems to be solved when buffers allocation for DMA based
transfers are *not* mapped with the DMA_ATTR_SKIP_CPU_SYNC flag *OR*
when IOMMU is disabled.
Notice that after transfer is done we do use
dma_sync_single_for_{cpu,device} and then we reuse *the same* page for
another transfer.
Can you please comment on whether DMA_ATTR_SKIP_CPU_SYNC can not be used
in ARM64 platforms with IOMMU ?
---
Thanks,
Jose Miguel Abreu
next prev parent reply other threads:[~2019-07-29 11:29 UTC|newest]
Thread overview: 87+ 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
2019-07-19 13:35 ` Jon Hunter
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
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 [this message]
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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