linux-kernel - Re: A weird problem of Realtek r8168 after resume from S3

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Date:   Fri, 14 Dec 2018 11:33:00 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     nic_swsd <nic_swsd@...ltek.com>, davem@...emloft.net,
        netdev@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: A weird problem of Realtek r8168 after resume from S3

On Thu, Dec 13, 2018 at 10:20 AM Chris Chiu <chiu@...lessm.com> wrote:
>
> Hi,
>     We got an acer laptop which has a problem with ethernet networking after
> resuming from S3. The ethernet is popular realtek r8168. The lspci shows as
> follows.
> 02:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12)
>
>     The problem is the ethernet is not accessible after resume. Pinging via
> ethernet always shows the response `Destination Host Unreachable`. However,
> the interesting part is, when I run tcpdump to monitor the problematic ethernet
> interface, the networking is back to alive. But it's dead again after
> I stop tcpdump.
> One more thing, if I ping the problematic machine from others, it achieves the
> same effect as above tcpdump. Maybe it's about the register setting for RX path?
>
>     I tried the latest 4.20 rc version but the problem still there. I
> also tried some
> hw_reset or init thing in the resume path but no effect. Any
> suggestion for this?
> Thanks
>
> Chris

Gentle ping. Any additional information required?

Chris