netdev - Lenovo I219-V e1000e device has severe RX checksum errors

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Message-ID: <a2011d9c626e57cffa0b0cee35d31cb481599244.camel@infinera.com>
Date:   Thu, 27 May 2021 15:03:50 +0000
From:   Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Lenovo I219-V e1000e device has severe RX checksum errors

00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (13) I219-V (rev 20)
	Subsystem: Lenovo Ethernet Connection (13) I219-V

This device is in newer Lenovo laptops like T14 gen2
Under Linux(Windows seems OK) this device sever network problems and is almost unusable

Turning off HW optimizations:
ethtool -K eth0 rx-checksumming off tx-checksumming off
ethtool -K eth0 scatter-gather off
ethtool -K eth0 receive-hashing off
ethtool -K eth0 rx-vlan-offload off tx-vlan-offload off

Makes the RX checksums go away but networking still suffers
Ping times on a local network varies wildly, > 100 ms in some cases
Googling around this seem like a common problem for Lenovo T14 gen 2

 Jocke