netdev - Re: [PATCH net-next 1/3] devlink: Add fw_version

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Message-ID: <20181106203751.GA30851@splinter.mtl.com>
Date:   Tue, 6 Nov 2018 22:37:51 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Ido Schimmel <idosch@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Shalom Toledo <shalomt@...lanox.com>,
        Moshe Shemesh <moshe@...lanox.com>,
        "dsahern@...il.com" <dsahern@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        mlxsw <mlxsw@...lanox.com>
Subject: Re: [PATCH net-next 1/3] devlink: Add fw_version_check generic
 parameter

On Tue, Nov 06, 2018 at 12:19:13PM -0800, Jakub Kicinski wrote:
> On Tue, 6 Nov 2018 20:05:00 +0000, Ido Schimmel wrote:
> > From: Shalom Toledo <shalomt@...lanox.com>
> > 
> > Many drivers checking the device's firmware version during the
> > initialization flow and flashing a compatible version if the current
> > version is not.
> > 
> > fw_version_check gives the ability to skip this check which allows to run
> > the device with a different firmware version than required by the driver
> > for testing and/or debugging purposes.
> > 
> > Signed-off-by: Shalom Toledo <shalomt@...lanox.com>
> > Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> > Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> 
> The documentation is missing, so it's hard to comment on the definition
> of the parameter...  

I assume you mean Documentation/networking/devlink-params.txt ?

> We have a FW loading policy for NFP, too, so it'd be good to see if we
> can find a common ground.

If the parameter is set, then device runs with whatever firmware version
was last flashed (via ethtool, for example). Otherwise, the driver will
flash a version according to its policy. In mlxsw, it is a specific
version.

Will that work for you?