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Subject: Re: R8169: Network lockups in 4.18.{8,9,10} (and 4.19 dev)
To:     Heiner Kallweit <hkallweit1@gmail.com>,
        "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Azat Khuzhin <a3at.mail@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Realtek linux nic maintainers <nic_swsd@realtek.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
References: <54d8d7e9-a80d-dc2b-5628-22f9dc14e2ee@maciej.szmigiero.name>
 <535f42c7-6c3b-8e5a-49de-5dc975879b21@googlemail.com>
 <98680351-5123-761f-982a-726098da9716@gmail.com>
From:   Chris Clayton <chris2553@googlemail.com>
Message-ID: <9980dcc1-f7fe-5de7-75be-99b1592c9206@googlemail.com>
Date:   Thu, 4 Oct 2018 09:41:00 +0100
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Hi Heiner,

Here's the reply to your questions. Sorry for the delay.

On 28/09/2018 23:13, Heiner Kallweit wrote:
> On 29.09.2018 00:00, Chris Clayton wrote:
>> Thanks Maciej.
>>
>> On 28/09/2018 16:54, Maciej S. Szmigiero wrote:
>>> Hi,
>>>
>>>> Hi,
>>>>
>>>> I upgraded my kernel to 4.18.10 recently and have since been experiencing network problems after resuming from a
>>>> suspend to RAM or disk. I previously had 4.18.6 and that was OK.
>>>>
>>>> The pattern of the problem is that when I first boot, the network is fine. But, after resume from suspend I find that
>>>> the time taken for a ping of one of my ISP's nameservers increases from 14-15ms to more than 1000ms. Moreover, when I
>>>> open a browser (chromium or firefox), it fails to retrieve my home page (https://www.google.co.uk) and pings of the
>>>> nameserver fail with the message "Destination Host Unreachable". Often, I can revive the network by stopping it with
>>>> /sbin/if(down,up} but sometimes it is necessary to also remove the r8169 module and load it again.
>>>
>>> Please have a look at the following thread:
>>> https://lkml.org/lkml/2018/9/25/1118
>>>
>>
>> I applied your patch for the 4.18 stable kernels to 4.18.10, but the problem is not solved by it. Similarly, I applied
>> Heiner's patch to the 4.19, but again the problem is not solved.
>>
> I think we talk about two different issues here. The one the fix is for has no link to suspend/resume.
> 
> Chris, the lspci output doesn't provide enough detail to determine the exact chip version.
> Can you provide the dmesg part with the XID?

$ dmesg | grep r8169
[    5.274938] libphy: r8169: probed
[    5.276563] r8169 0000:05:00.2 eth0: RTL8411, 80:fa:5b:08:d0:3d, XID 48800800, IRQ 29
[    5.278158] r8169 0000:05:00.2 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[    9.275275] RTL8211E Gigabit Ethernet r8169-502:00: attached PHY driver [RTL8211E Gigabit Ethernet]
(mii_bus:phy_addr=r8169-502:00, irq=IGNORE)
[    9.460876] r8169 0000:05:00.2 eth0: No native access to PCI extended config space, falling back to CSI
[   11.005336] r8169 0000:05:00.2 eth0: Link is Up - 100Mbps/Full - flow control rx/tx

> According to your lspci output neither MSI nor MSI-X is active.
> Do you have to use nomsi for whatever reason?
> 

No, I do not use nomsi, but MSI wasn't enabled in my kernel config. I'm 99% sure that it used to be - I've no idea how
it got dropped. If I'm not sure about an option, I start by taking the recommendation in the kconfig help. Help on MSI
has a very clear "say Y". I've re-enabled it now.

Chris

> Heiner
> 
>>> Maciej
>>>
>> Chris
>>
> 
>