linux-kernel - Re: [PATCH net-next 4/6] arm64: dts: fsl: ls1028a: Add Felix switch port DT node

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Message-ID: <20190705131914.GA4428@lunn.ch>
Date:   Fri, 5 Jul 2019 15:19:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     Vladimir Oltean <olteanv@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "Allan W. Nielsen" <allan.nielsen@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexandru Marginean <alexandru.marginean@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Allan Nielsen <Allan.Nielsen@...rosemi.com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH net-next 4/6] arm64: dts: fsl: ls1028a: Add Felix switch
 port DT node

> Nice discussion, again, but there's a missing point that has not been
> brought up yet.  We actually intend to support the following hardware
> configuration: a single PCI device consisting of the Microsemi's switch core
> and our DMA rings.
> The hardware supports this configuration into a single PCI function (PF), 
> with a unique PCI function id (0xe111), so that the same driver has access to 
> both switch registers and DMA rings connected to the CPU port.  This device
> would qualify  as a  switchdev device, and we can simply reuse the existing
> ocelot code for the switch core part.  The initial patch set was the first step in
> supporting the switch core on our platform, we just need to add the support
> for the DMA rings part, to make it a complete switchdev solution.

Hi Claudiu

It sound like in the end you will have a core library and then two
drivers wrapped around it, giving a pure switchdev device with polled
IO or DMA, and a DSA driver using a CPU port.

   Andrew