Hi Heiner, first, thank you for looking into this!
On Wed, 15 Jul 2020 17:22:35 +0200 Heiner Kallweit <hkallwe...@gmail.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
