linux-kernel - Re: [PATCH net] net: mrp: use stp state as substitute for unimplemented mrp state

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Message-ID: <20210118194632.zn5yucjfibguemjq@skbuf>
Date:   Mon, 18 Jan 2021 19:46:33 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
CC:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: mrp: use stp state as substitute for
 unimplemented mrp state

On Mon, Jan 18, 2021 at 07:56:18PM +0100, Horatiu Vultur wrote:
> The reason was to stay away from STP, because you can't run these two
> protocols at the same time. Even though in SW, we reuse port's state.
> In our driver(which is not upstreamed), we currently implement
> SWITCHDEV_ATTR_ID_MRP_PORT_STATE and just call the
> SWITCHDEV_ATTR_ID_PORT_STP_STATE.

And isn't Rasmus's approach reasonable, in that it allows unmodified
switchdev drivers to offload MRP port states without creating
unnecessary code churn?

Also, if it has no in-kernel users, why does it even exist as a
switchdev attribute?