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From:   "Volodymyr Mytnyk [C]" <vmytnyk@marvell.com>
To:     Andrew Lunn <andrew@lunn.ch>
CC:     "kuba@kernel.org" <kuba@kernel.org>,
        Mickey Rachamim <mickeyr@marvell.com>,
        Serhiy Pshyk <serhiy.pshyk@plvision.eu>,
        Taras Chornyi <taras.chornyi@plvision.eu>,
        "Vadym Kochan [C]" <vkochan@marvell.com>,
        Yevhen Orlov <yevhen.orlov@plvision.eu>,
        "Taras Chornyi [C]" <tchornyi@marvell.com>,
        "David S. Miller" <davem@davemloft.net>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next v3] net: marvell: prestera: add firmware v4.0
 support
Thread-Topic: [PATCH net-next v3] net: marvell: prestera: add firmware v4.0
 support
Thread-Index: AQHXxk79iqTIw1mkTkyXMt8fIF9KfA==
Date:   Thu, 21 Oct 2021 07:40:59 +0000
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 <YXAP/sZhSnvUUYNk@lunn.ch>
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Hi Andrew=0A=
=0A=
> On Wed, Oct 20, 2021 at 12:32:28PM +0300, Volodymyr Mytnyk wrote:=0A=
> > From: Volodymyr Mytnyk <vmytnyk@marvell.com>=0A=
> > =0A=
> > Add firmware (FW) version 4.0 support for Marvell Prestera driver.=0A=
> > =0A=
> > Major changes have been made to new v4.0 FW ABI to add support of new =
=0A=
> > features, introduce the stability of the FW ABI and ensure better =0A=
> > forward compatibility for the future driver vesrions.=0A=
> > =0A=
> > Current v4.0 FW feature set support does not expect any changes to =0A=
> > ABI, as it was defined and tested through long period of time.=0A=
> > The ABI may be extended in case of new features, but it will not break =
=0A=
> > the backward compatibility.=0A=
> =0A=
> So if we decide to merge this, we will hold you to this statement. You ca=
n never again break the ABI. The driver will always support v4.0 firmware.=
=0A=
> =0A=
> Are you really sure you have it correct this time?=0A=
> =0A=
>     Andrew=0A=
> =0A=
=0A=
So, the v4.0 FW supports stable ABI for the following set of features:=0A=
=0A=
  - L1 port management=0A=
  - lag, vlans=0A=
  - routing, ecmp=0A=
  - tc templates, chains, conntrack, policer=0A=
  - bridge port insolation=0A=
  - HW counters=0A=
  - storm control=0A=
=0A=
Some of those features are not fully supported yet by the driver. So, while=
 we support these in the driver, the ABI is not expected to be changed.=0A=
Of course, with new features to come, the FW will be extended, while the ba=
ckward compatibility will remain stable with the previous FW version. =0A=
Bottom line, for this set of features, the ABI is expected to remain as is.=
=0A=
=0A=
  Volodymyr=