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Date:   Wed, 13 Oct 2021 19:19:28 -0700
From:   Florian Fainelli <>
To:     Alvin Šipraga <>,
        Linus Walleij <>,
        Andrew Lunn <>,
        Vivien Didelot <>,
        Vladimir Oltean <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Rob Herring <>,
        Heiner Kallweit <>,
        Russell King <>
Cc:     Alvin Šipraga <>,,,
Subject: Re: [PATCH v2 net-next 4/6] net: dsa: tag_rtl8_4: add realtek 8 byte
 protocol 4 tag

On 10/13/2021 7:50 AM, Alvin Šipraga wrote:
> From: Alvin Šipraga <>
> This commit implements a basic version of the 8 byte tag protocol used
> in the Realtek RTL8365MB-VC unmanaged switch, which carries with it a
> protocol version of 0x04.
> The implementation itself only handles the parsing of the EtherType
> value and Realtek protocol version, together with the source or
> destination port fields. The rest is left unimplemented for now.
> The tag format is described in a confidential document provided to my
> company by Realtek Semiconductor Corp. Permission has been granted by
> the vendor to publish this driver based on that material, together with
> an extract from the document describing the tag format and its fields.
> It is hoped that this will help future implementors who do not have
> access to the material but who wish to extend the functionality of
> drivers for chips which use this protocol.
> In addition, two possible values of the REASON field are specified,
> based on experiments on my end. Realtek does not specify what value this
> field can take.
> Signed-off-by: Alvin Šipraga <>
> Reviewed-by: Vladimir Oltean <>
> Reviewed-by: Linus Walleij <>

Reviewed-by: Florian Fainelli <>

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