netdev - Re: [RFC 0/4] net: l2switch: Provide support for L2 switch on i.MX28 SoC

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Message-ID: <c717666c-8357-60a2-7c66-5d9e9f18d250@gmail.com>
Date:   Wed, 25 Nov 2020 17:30:04 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Lukasz Majewski <lukma@...x.de>
Cc:     Peng Fan <peng.fan@....com>, Fugang Duan <fugang.duan@....com>,
        Shawn Guo <shawnguo@...nel.org>, stefan.agner@...adex.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        krzk@...nel.org, "David S . Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 0/4] net: l2switch: Provide support for L2 switch on i.MX28
 SoC



On 11/25/2020 4:00 PM, Andrew Lunn wrote:
> On Thu, Nov 26, 2020 at 12:24:55AM +0100, Lukasz Majewski wrote:
>> This is the first attempt to add support for L2 switch available on some NXP
>> devices - i.e. iMX287 or VF610. This patch set uses common FEC and DSA code.
> 
> Interesting. I need to take another look at the Vybrid manual. Last
> time i looked, i was more thinking of a pure switchdev driver, not a
> DSA driver. So i'm not sure this is the correct architecture. But has
> been a while since i looked at the datasheet.

Agreed the block diagram shows one DMA for each "switch port" which
definitively fits more within the switchdev model than the DSA model
that re-purposes an existing Ethernet MAC controller as-is and bolts on
an integrated or external switch IC.
-- 
Florian