linux-kernel - Re: [PATCH v4 5/6] can: etas_es58x: report the firmware version through ethtool

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Message-ID: <20221129183102.1983375c@kernel.org>
Date:   Tue, 29 Nov 2022 18:31:02 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>
Cc:     linux-can@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        Saeed Mahameed <saeed@...nel.org>,
        Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...dia.com>,
        Lukas Magel <lukas.magel@...teo.net>
Subject: Re: [PATCH v4 5/6] can: etas_es58x: report the firmware version
 through ethtool

On Wed, 30 Nov 2022 02:12:27 +0900 Vincent MAILHOL wrote:
> I was not aware of this one. Thank you for pointing this out.
> If I correctly understand, devlink_compat_running_version() is
> supposed to allow ethtool to retrieve the firmware version from
> devlink, right?

Yes.

> Currently it does not work. I guess it is because I am not using
> SET_NETDEV_DEVLINK_PORT()? I initially thought that this was optional.

It's optional but breaks the linking hence the fallback can't kick in.
I guess "optional-ity" is a spectrum :)

> I will continue to investigate and see if it is possible to completely
> remove the .get_drvinfo() callback.