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

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Date:   Mon, 22 Jul 2019 09:57:21 +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>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: RE: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool

From: Jose Abreu <joabreu@...opsys.com>
Date: Jul/22/2019, 10:47:44 (UTC+00:00)

> From: Jon Hunter <jonathanh@...dia.com>
> Date: Jul/22/2019, 10:37:18 (UTC+00:00)
> 
> > 
> > On 22/07/2019 08:23, Jose Abreu wrote:
> > > From: Jon Hunter <jonathanh@...dia.com>
> > > Date: Jul/19/2019, 14:35:52 (UTC+00:00)
> > > 
> > >>
> > >> On 19/07/2019 13:32, Jose Abreu wrote:
> > >>> From: Jon Hunter <jonathanh@...dia.com>
> > >>> Date: Jul/19/2019, 13:30:10 (UTC+00:00)
> > >>>
> > >>>> I booted the board without using NFS and then started used dhclient to
> > >>>> bring up the network interface and it appears to be working fine. I can
> > >>>> even mount the NFS share fine. So it does appear to be particular to
> > >>>> using NFS to mount the rootfs.
> > >>>
> > >>> Damn. Can you send me your .config ?
> > >>
> > >> Yes no problem. Attached.
> > > 
> > > Can you compile your image without modules (i.e. all built-in) and let 
> > > me know if the error still happens ?
> > 
> > I simply removed the /lib/modules directory from the NFS share and
> > verified that I still see the same issue. So it is not loading the
> > modules that is a problem.
> 
> Well, I meant that loading modules can be an issue but that's not the 
> way to verify that.
> 
> You need to have all modules built-in so that it proves that no module 
> will try to be loaded.
> 
> Anyway, this is probably not the cause as you wouldn't even be able to 
> compile kernel if you need a symbol from a module with stmmac built-in. 
> Kconfig would complain about that.
> 
> The other cause could be data corruption in the RX path. Are you able to 
> send me packet dump by running wireshark either in the transmitter side 
> (i.e. NFS server), or using some kind of switch ?
> 
> ---
> Thanks,
> Jose Miguel Abreu

Also, please add attached patch. You'll get a compiler warning, just 
disregard it.

---
Thanks,
Jose Miguel Abreu

Download attachment "0001-net-stmmac-Debug-print.patch" of type "application/octet-stream" (1514 bytes)