netdev - Re: [PATCH net-next v2] docs: net: dsa: describe issues with checksum offload

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Message-ID: <87tuawp493.fsf@kurt>
Date:   Thu, 14 Apr 2022 08:29:12 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        George McCollister <george.mccollister@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "corbet@....net" <corbet@....net>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next v2] docs: net: dsa: describe issues with
 checksum offload

On Wed Apr 13 2022, Vladimir Oltean wrote:
> I've copied a bunch of new people to this email.
>
> TL;DR: Kurt/George/Andrew, on your systems with hellcreek/xrs700x/mv88e6060,
> does the DSA master declare any of the following features as "on"?
>
> ethtool -k eth0 | grep tx-checksum-ip

It's a Cyclone V with stmmac as master:

|root@tsn:~# ethtool -k eth0 | grep tx-checksum-ip
|        tx-checksum-ipv4: on
|        tx-checksum-ip-generic: off [fixed]
|        tx-checksum-ipv6: on

>
> I would expect not. Otherwise, we've either found a bug, or discovered
> the Sasquatch.

Now, I'm wondering how this actually works. Anyway, I'll send a patch to
add the missing skb_checksum_help().

Thanks,
Kurt

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