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Date:   Thu, 18 Jul 2019 20:50:29 +0200 (CEST)
From:   Thomas Voegtle <tv@lio96.de>
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To:     Heiner Kallweit <hkallweit1@gmail.com>,
        linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>
Subject: network problems with r8169
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Hello,

I'm having network problems with the commits on r8169 since v5.2. There 
are ping packet loss, sometimes 100%, sometimes 50%. In the end network is 
unusable.

v5.2 is fine, I bisected it down to:

a2928d28643e3c064ff41397281d20c445525032 is the first bad commit
commit a2928d28643e3c064ff41397281d20c445525032
Author: Heiner Kallweit <hkallweit1@gmail.com>
Date:   Sun Jun 2 10:53:49 2019 +0200

     r8169: use paged versions of phylib MDIO access functions

     Use paged versions of phylib MDIO access functions to simplify
     the code.

     Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
     Signed-off-by: David S. Miller <davem@davemloft.net>


Reverting that commit on top of v5.2-11564-g22051d9c4a57 fixes the problem
for me (had to adjust the renaming to r8169_main.c).

I have a:
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev
0c)
         Subsystem: Biostar Microtech Int'l Corp Device [1565:2400]
         Kernel driver in use: r8169

on a BIOSTAR H81MG motherboard.


greetings,

   Thomas