netdev - Re: RTL8402 stops working after hibernate/resume

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Date:   Thu, 16 Jul 2020 10:58:35 +0200
From:   Petr Tesarik <ptesarik@...e.cz>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        netdev@...r.kernel.org
Subject: Re: RTL8402 stops working after hibernate/resume

Hi Heiner,

first, thank you for looking into this!

On Wed, 15 Jul 2020 17:22:35 +0200
Heiner Kallweit <hkallweit1@...il.com> wrote:

> On 15.07.2020 10:28, Petr Tesarik wrote:
> > Hi all,
> > 
> > I've encountered some issues on an Asus laptop. The RTL8402 receive
> > queue behaves strangely after suspend to RAM and resume - many incoming
> > packets are truncated, but not all and not always to the same length
> > (most commonly 60 bytes, but I've also seen 150 bytes and other
> > lengths).
> > 
> > Reloading the driver can fix the problem, so I believe we must be
> > missing some initialization on resume. I've already done some
> > debugging, and the interface is not running when rtl8169_resume() is
> > called, so __rtl8169_resume() is skipped, which means that almost
> > nothing is done on resume.
> >   
> The dmesg log part in the opensuse bug report indicates that a userspace
> tool (e.g. NetworkManager) brings down the interface on suspend.
> On resume the interface is brought up again, and PHY driver is loaded.
> Therefore it's ok that rtl8169_resume() is a no-op.
> 
> The bug report mentions that the link was down before suspending.
> Does the issue also happen if the link is up when suspending?

I have tried, and it makes no difference.

> Interesting would also be a test w/o a network manager.
> Means the interface stays up during suspend/resume cycle.

I have stopped NetworkManager and configured a static IP address for
the interface. Still the same result.

I have verified that the firmware is loaded, both before suspend and
after resume:

zabulon:~ # ethtool -i eth0 
driver: r8169
version: 5.7.7-1-default
firmware-version: rtl8402-1_0.0.1 10/26/11
expansion-rom-version: 
bus-info: 0000:03:00.2
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

> Unfortunately it's not known whether it's a regression, and I have no
> test hw with this chip version.
> 
> Also you could test whether the same happens with the r8101 vendor driver.

I was not aware of this alternative driver... Anyway, I have built
r8101 from git (v1.035.03) for kernel 5.7.7. When loaded, it hangs the
machine hard. I mean like not even SysRq+B works...

Petr T

> > Some more information can be found in this openSUSE bug report:
> > 
> > https://bugzilla.opensuse.org/show_bug.cgi?id=1174098
> > 
> > The laptop is not (yet) in production, so I can do further debugging if
> > needed.
> > 
> > Petr T
> >   
> Heiner