linux-kernel - Re: net: dsa: Realtek switch drivers

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Message-ID: <16eef908-3e80-458c-9e20-f29932298124@alliedtelesis.co.nz>
Date: Tue, 9 Jul 2024 08:42:38 +1200
From: Chris Packham <chris.packham@...iedtelesis.co.nz>
To: Vladimir Oltean <olteanv@...il.com>
Cc: "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
 "alsi@...g-olufsen.dk" <alsi@...g-olufsen.dk>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...il.com>, Marek Behún
 <kabel@...nel.org>, "ericwouds@...il.com" <ericwouds@...il.com>,
 David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 "kuba@...nel.org" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 "luizluca@...il.com" <luizluca@...il.com>,
 "justinstitt@...gle.com" <justinstitt@...gle.com>,
 "rmk+kernel@...linux.org.uk" <rmk+kernel@...linux.org.uk>,
 netdev <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: net: dsa: Realtek switch drivers

Hi Vladmir,

On 9/07/24 02:23, Vladimir Oltean wrote:
> On Fri, Jun 14, 2024 at 01:49:35AM +0000, Chris Packham wrote:
>> Hi All,
>>
>> I'm starting to look at some L2/L3 switches with Realtek silicon. I see
>> in the upstream kernel there are dsa drivers for a couple of simple L2
>> switches. While openwrt has support for a lot of the more advanced
>> silicon. I'm just wondering if there is a particular reason no-one has
>> attempted to upstream support for these switches? If I were to start
>> grabbing drivers from openwrt and trying to get them landed would that
>> be a problem?
>>
>> Thanks,
>> Chris
> What do you mean by the L3 switching functionality, exactly? Offloading
> of inter-VLAN routing? Or routing offload in general?

Offloading of inter-VLAN routing. There's also some multicast and qos 
capability too.

I gather the general idea is to provide mechanisms for the hardware to 
accelerate parts of the forwarding plane. I haven't got into the details 
of that yet, my first set of requirements is just around basic L2 
switching which I think is pretty well supported at this point.