netdev - Re: [PATCH net-next v8 3/5] net: dsa: add out-of-band tagging protocol

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Message-ID: <20221107125126.py5n244zk3inawsx@skbuf>
Date:   Mon, 7 Nov 2022 12:51:26 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH net-next v8 3/5] net: dsa: add out-of-band tagging
 protocol

On Mon, Nov 07, 2022 at 01:27:36PM +0200, Vladimir Oltean wrote:
> Hi Jakub,
> (...)

There is also another problem having to do with future extensibility of
METADATA_HW_PORT_MUX for DSA. I don't know how much of this is going to
be applicable for qca8k, but DSA tags might also carry such information
as trap reason (RX) or injection type (into forwarding plane or control
packet; the latter bypasses port STP state) and the FID to which the
packet should be classified by the hardware (TX). If we're going to
design a mechanism which only preallocates metadata dst's for ports,
it's going to be difficult to make that work for more information later on.