linux-kernel - Re: [OpenWrt-Devel] [PATCH v3 0/6] staging: Introduce DPAA2 Ethernet Switch driver

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Date:   Sat, 14 Oct 2017 15:11:09 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Razvan Stefanescu <razvan.stefanescu@....com>,
        OpenWrt Development List <openwrt-devel@...ts.openwrt.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        ruxandra.radulescu@....com, Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        alexandru.marginean@....com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexander Graf <agraf@...e.de>,
        Stuart Yoder <stuyoder@...il.com>, bogdan.purcareata@....com,
        laurentiu.tudor@....com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Subject: Re: [OpenWrt-Devel] [PATCH v3 0/6] staging: Introduce DPAA2 Ethernet Switch driver

On October 14, 2017 2:59:22 PM PDT, Linus Walleij <linus.walleij@...aro.org> wrote:
>On Sat, Oct 14, 2017 at 8:52 PM, Florian Fainelli
><f.fainelli@...il.com> wrote:
>
>> The most deployed switch device drivers have been converted to DSA
>> already: b53, qca8k (ar83xx in OpenWrt/LEDE) and mtk7530 are all in
>> tree, and now we are getting new submissions from Michrochip to
>support
>> their pretty large KSZ series. Converting from swconfig to DSA is
>> actually quite simple, but like anything requires time and testing,
>and
>> access to hardware and ideally datasheet.
>
>Hm, I have a Realtek RB8366RB in this router on my desk.
>
>I guess that means I should just take the old switchdev-based
>SMI-driver and convert it to DSA.
>
>I bet I can do that :D

Yes, it really should not be too hard. The OpenWrt/LEDE driver had mostly the same semantics as what is needed for being a proper DSA driver. You should of course start simple: get basic switching working, then add statistics, VLAN, FDB, etc. OpenWrt/LEDE models switches as PHY device objects which would not work upstream so you should have the driver be probed as a MDIO/SPI/I2C (see b53 for example) and set up fixed-link properties between the CPU and the switch.

>
>Well, I will try. Because it's blocking me to work on the Gemini
>ethernet driver.

Well usually the boot loader may leave the switch in a good enough state that you can work on the CPU controller mostly independently from dealing with the switch. This is not universally true, and a properly working bootloader should actually quiesce/reset both blocks prior to OS control.

Don't hesitate if you have questions.

Cheers.

-- 
Florian