netdev - Re: [PATCH RFC] net: sfp: support assigning status LEDs to SFP connectors

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Message-ID: <YnuPRKRBj/5YbAUQ@shell.armlinux.org.uk>
Date:   Wed, 11 May 2022 11:26:12 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Josua Mayer <josua@...id-run.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH RFC] net: sfp: support assigning status LEDs to SFP
 connectors

On Tue, May 10, 2022 at 02:13:42PM +0200, Andrew Lunn wrote:
> > > As far as i'm aware, the in kernel code always has a netdev for each
> > > MAC. Are you talking about the vendor stack?
> > The coprocessor can be configured both at boot-time and runtime.
> > During runtime there is a vendor tool "restool" which can create and destroy
> > network interfaces, which the dpaa2 driver knows to discover and bind to.
> 
> There should not be any need to use a vendor tool for mainline. In
> fact, that is strongly discouraged, since it leads to fragmentation,
> each device doing its own thing, the user needing to read each vendors
> user manual, rather than it just being a standard Unix box with
> interfaces.

You're missing the bigger picture.

There are two ways to setup the networking on LX2160A - one is via
DT-like files that are processed by the network firmware, which tells
it what you want to do with each individual network connection.

Then there is a userspace tool that talks to the LX2160A network
firmware and requests it to configure the network layer - e.g. create
a network interface to connect to a network connection, or whatever.

I believe that when using DPDK, one does not want the network
connections to be associated with Linux network interfaces - but
don't quote me on that.

The tool has nothing to do with LEDs. It's all about talking to the
networking firmware on the chip.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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