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

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Date:   Thu, 13 Dec 2018 10:20:35 +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: A weird problem of Realtek r8168 after resume from S3

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