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

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Date:   Mon, 24 Jun 2019 18:24:31 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Allan W. Nielsen" <allan.nielsen@...rochip.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....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

On Mon, Jun 24, 2019 at 05:23:45PM +0200, Allan W. Nielsen wrote:
> Hi Andrew,
> 
> The 06/24/2019 16:26, Andrew Lunn wrote:
> > > > Yeah, there are 2 ethernet controller ports (managed by the enetc driver) 
> > > > connected inside the SoC via SGMII links to 2 of the switch ports, one of
> > > > these switch ports can be configured as CPU port (with follow-up patches).
> > > > 
> > > > This configuration may look prettier on DSA, but the main restriction here
> > > > is that the entire functionality is provided by the ocelot driver which is a
> > > > switchdev driver.  I don't think it would be a good idea to copy-paste code
> > > > from ocelot to a separate dsa driver.
> > > > 
> > > 
> > > We should probably make the ocelot driver a DSA driver then...
> > An important part of DSA is being able to direct frames out specific
> > ports when they ingress via the CPU port. Does the silicon support
> > this? At the moment, i think it is using polled IO.
> 
> That is supported, it requires a bit of initial configuration of the Chip, but
> nothing big (I believe this configuration is part of Claudiu's change-set).
> 
> But how do you envision this done?
> 
> - Let the existing SwitchDev driver and the DSA driver use a set of common
>   functions.
> - Convert the existing Ocelot driver from SwitchDev to DSA
> - Fork (copy) the existing driver of Ocelot, and modify it as needed for the
>   Felix driver
> 
> My guess is the first one, but I would like to understand what you have in mind.

I don't know the various architectures the switch is used in. But it
does seem like a core library, and then a switchdev wrapper for Ocelot
and a DSA wrapper for Felix would make sense.
 
  Andrew