linux-kernel - Re: [PATCH v5 1/7] can: netlink: allow user to turn off unsupported features

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Message-ID: <20210819100740.l4ci5taj6m27x2am@pengutronix.de>
Date:   Thu, 19 Aug 2021 12:07:40 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>
Cc:     linux-can <linux-can@...r.kernel.org>,
        Stefan Mätje <Stefan.Maetje@....eu>,
        netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/7] can: netlink: allow user to turn off unsupported
 features

On 19.08.2021 18:24:27, Vincent MAILHOL wrote:
> On Thu. 19 Aug 2021 at 16:45, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> > On 15.08.2021 12:32:42, Vincent Mailhol wrote:
> > > The sanity checks on the control modes will reject any request related
> > > to an unsupported features, even turning it off.
> > >
> > > Example on an interface which does not support CAN-FD:
> > >
> > > $ ip link set can0 type can bitrate 500000 fd off
> > > RTNETLINK answers: Operation not supported
> > >
> > > This patch lets such command go through (but requests to turn on an
> > > unsupported feature are, of course, still denied).
> > >
> > > Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> >
> > I'm planing to send a pull request to net-next today. I want to do some
> > more tests with this series
> 
> Ack, I am also preparing a new version. But first, I am just
> waiting for your reply on the tdc-mode {auto, manual, off}. :)

I want to do some proper testing, if it's now working as I'm expecting,
before continuing the discussion. :D

> > but this patch is more or less unrelated,
> > so I can take it in this PR, should I?
> 
> FYI, the reason to add it to the series is that when setting TDC to
> off, the ip tool sets both CAN_CTRLMODE_TDC_AUTO and
> CAN_CTRLMODE_TDC_MANUAL to zero (which the corresponding bits in
> can_ctrlmode::mask set to 1).  Without this patch, netlink would
> return -ENOTSUPP if the driver only supported one of
> CAN_CTRLMODE_TDC_{AUTO,MANUAL}.

Oh, I see.

> Regardless, this patch makes sense as a standalone, I am fine if
> you include it in your PR.

Why not, reduces the patch amount on your side :)

> Also, if you want, you can include the latest patch of the series as well:
> https://lore.kernel.org/linux-can/20210815033248.98111-8-mailhol.vincent@wanadoo.fr/
> 
> It's a comment fix, it should be pretty harmless.

Ok, makes sense.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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