netdev - broken ipv6 tcp csum offload on thunderx

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Date:   Wed, 22 Nov 2017 09:54:22 +0100
From:   Florian Westphal <fw@...len.de>
To:     tsrinivasulu@...ium.com
Cc:     netdev@...r.kernel.org, sgoutham@...ium.com
Subject: broken ipv6 tcp csum offload on thunderx

Hi.

We are experiencing broken ipv6 connectivity with 4.14 kernel
on arm64 with thunderx.

ping6 still works, but it looks like tcp syn packets get sent
with a wrong checksum -- socket remains in SYN-SENT state.

after running

ethtool -K enP2p1s0f1 tx-checksum-ipv6 off

ipv6 tcp appears to works fine.

# ethtool -i enP2p1s0f1
driver: thunder-nicvf
version: 1.0
firmware-version: 
expansion-rom-version: 
bus-info: 0002:01:00.1
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

[0.000000] Boot CPU: AArch64 Processor [431f0a10]
[0.000000] Machine model: cavium,thunder-88xx
[0.000000] efi: Getting EFI parameters from FDT:
[0.000000] efi: EFI v2.40 by Cavium Thunder cn88xx EFI ThunderX-Firmware-Release-1.22.17 Sep 21 2017 14:26:28
[0.000000] efi:  ACPI=0xffff0000  ACPI 2.0=0xffff0014 SMBIOS=0xffef0000  SMBIOS 3.0=0x10ffaf30000  ESRT=0x10fff673e18

What other information do you need to debug this?

Thanks,
	Florian