netdev - Re: net: stmmac: dwmac-meson8b: interface sometimes does not come up at boot

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Date:   Thu, 3 Feb 2022 16:53:27 +0300
From:   Vyacheslav <adeep@...ina.in>
To:     Erico Nunes <nunes.erico@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-amlogic@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: net: stmmac: dwmac-meson8b: interface sometimes does not come up
 at boot

Hi

I have same problem with meson8b on S905W Amlogic SoC.
"ethtool -r" fixes problem after start

02.02.2022 23:18, Erico Nunes wrote:
> Hello,
> 
> I've been tracking down an issue with network interfaces from
> meson8b-dwmac sometimes not coming up properly at boot.
> The target systems are AML-S805X-CC boards (Amlogic S805X SoC), I have
> a group of them as part of a CI test farm that uses nfsroot.
> 
> After hopefully ruling out potential platform/firmware and network
> issues I managed to bisect this commit in the kernel to make a big
> difference:
> 
>    46f69ded988d2311e3be2e4c3898fc0edd7e6c5a net: stmmac: Use resolved
> link config in mac_link_up()
> 
> With a kernel before that commit, I am able to submit hundreds of test
> jobs and the boards always start the network interface properly.
> 
> After that commit, around 30% of the jobs start hitting this:
> 
>    [    2.178078] meson8b-dwmac c9410000.ethernet eth0: PHY
> [0.e40908ff:08] driver [Meson GXL Internal PHY] (irq=48)
>    [    2.183505] meson8b-dwmac c9410000.ethernet eth0: Register
> MEM_TYPE_PAGE_POOL RxQ-0
>    [    2.200784] meson8b-dwmac c9410000.ethernet eth0: No Safety
> Features support found
>    [    2.202713] meson8b-dwmac c9410000.ethernet eth0: PTP not supported by HW
>    [    2.209825] meson8b-dwmac c9410000.ethernet eth0: configuring for
> phy/rmii link mode
>    [    3.762108] meson8b-dwmac c9410000.ethernet eth0: Link is Up -
> 100Mbps/Full - flow control off
>    [    3.783162] Sending DHCP requests ...... timed out!
>    [   93.680402] meson8b-dwmac c9410000.ethernet eth0: Link is Down
>    [   93.685712] IP-Config: Retrying forever (NFS root)...
>    [   93.756540] meson8b-dwmac c9410000.ethernet eth0: PHY
> [0.e40908ff:08] driver [Meson GXL Internal PHY] (irq=48)
>    [   93.763266] meson8b-dwmac c9410000.ethernet eth0: Register
> MEM_TYPE_PAGE_POOL RxQ-0
>    [   93.779340] meson8b-dwmac c9410000.ethernet eth0: No Safety
> Features support found
>    [   93.781336] meson8b-dwmac c9410000.ethernet eth0: PTP not supported by HW
>    [   93.788088] meson8b-dwmac c9410000.ethernet eth0: configuring for
> phy/rmii link mode
>    [   93.807459] random: fast init done
>    [   95.353076] meson8b-dwmac c9410000.ethernet eth0: Link is Up -
> 100Mbps/Full - flow control off
> 
> This still happens with a kernel from master, currently 5.17-rc2 (less
> frequently but still often hit by CI test jobs).
> The jobs still usually get to work after restarting the interface a
> couple of times, but sometimes it takes 3-4 attempts.
> 
> Here is one example and full dmesg:
> https://gitlab.freedesktop.org/enunes/mesa/-/jobs/16452399/raw
> 
> Note that DHCP does not seem to be an issue here, besides the fact
> that the problem only happens since the mentioned commit under the
> same setup, I did try to set up the boards to use a static ip but then
> the interfaces just don't communicate at all from boot.
> 
> For test purposes I attempted to revert
> 46f69ded988d2311e3be2e4c3898fc0edd7e6c5a on top of master but that
> does not apply trivially anymore, and by trying to revert it manually
> I haven't been able to get a working interface.
> 
> Any advice on how to further debug or fix this?
> 
> Thanks
> 
> Erico
>