netdev - Re: [PATCH net] net: dsa: hellcreek: Calculate checksums in tagger

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Date:   Sat, 16 Apr 2022 12:40:38 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: hellcreek: Calculate checksums in tagger



On 4/15/2022 3:33 AM, Kurt Kanzenbach wrote:
> In case the checksum calculation is offloaded to the DSA master network
> interface, it will include the switch trailing tag. As soon as the switch strips
> that tag on egress, the calculated checksum is wrong.
> 
> Therefore, add the checksum calculation to the tagger (if required) before
> adding the switch tag. This way, the hellcreek code works with all DSA master
> interfaces regardless of their declared feature set.
> 
> Fixes: 01ef09caad66 ("net: dsa: Add tag handling for Hirschmann Hellcreek switches")
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian