linux-kernel - RE: [EXT] Re: [PATCH net-next 5/7] net: marvell: prestera: add LAG support

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Message-ID: <87h7ml3oz4.fsf@waldekranz.com>
Date:   Tue, 09 Feb 2021 22:34:07 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Mickey Rachamim <mickeyr@...vell.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev\@vger.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: RE: [EXT] Re: [PATCH net-next 5/7] net: marvell: prestera: add LAG support

On Tue, Feb 09, 2021 at 20:31, Mickey Rachamim <mickeyr@...vell.com> wrote:
> Hi Andrew, Jakub, Tobias,
>
> On Tuesday, February 9, 2021 7:35 PM Jakub Kicinski wrote:
>> Sounds like we have 3 people who don't like FW-heavy designs dominating the kernel - this conversation can only go one way. 
>> Marvell, Plvision anything to share? AFAIU the values of Linux kernel are open source, healthy community, empowering users. With the SDK on the embedded CPU your driver does not seem to tick any of these boxes.
>
> I'll try to share Marvell's insight and plans regarding our Prestera drivers;
>  
> We do understand the importance and the vision behind the open-source community - while being committed to quality, functionality and the developers/end-users.
>
> We started working on the Prestera driver in Q2 2019. it took us more than a year to get the first approved driver into 5.10, and we just started.
> Right at the beginning - we implemented PP function into the Kernel driver like the SDMA operation (This is the RX/TX DMA engine). 
> Yet, the FW itself - is an SW package that supports many Marvell Prestera Switching families of devices - this is a significant SW package that will take many working years to adapt to the Kernel environment.
> We do plan to port more and more PP functions as Kernel drivers along the way.

This is very encouraging to hear. I understand that it is a massive
undertaking.

> We also are working with the community to extend Kernel functionality with a new feature beneficial to all Kernel users (e.g. Devlink changes) and we will continue to do it.
> By extending the Prestera driver to in-kernel implementation with more PP features - we will simplify the FW logic and enables cost-effective solutions to the market/developers.

Until that day arrives, are there any chances of Marvell opening up CPSS
in the same way DSDT was re-licensed some years back?

Being able to clone github.com/Marvell-switching/prestera-firmware (or
whatever) and build the firmware from source would go a long way to
alleviate my fears at least.

In such a world, I at least have a chance of debugging any issue all the
way to the bottom of the stack. It would also make it possible for the
community to help out with the porting effort.

> Regards,
> Mickey.