linux-kernel - Re: [RFC PATCH 11/13] can: slcan: add ethtool support to reset adapter errors

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Message-ID: <20220609063813.jf5u6iaghoae5dv3@pengutronix.de>
Date:   Thu, 9 Jun 2022 08:38:13 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        michael@...rulasolutions.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 11/13] can: slcan: add ethtool support to reset
 adapter errors

On 08.06.2022 18:33:08, Dario Binacchi wrote:
> Hi Marc,
> 
> On Tue, Jun 7, 2022 at 12:52 PM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> >
> > On 07.06.2022 11:47:50, Dario Binacchi wrote:
> > > This patch adds a private flag to the slcan driver to switch the
> > > "err-rst-on-open" setting on and off.
> > >
> > > "err-rst-on-open" on  - Reset error states on opening command
> > >
> > > "err-rst-on-open" off - Don't reset error states on opening command
> > >                         (default)
> > >
> > > The setting can only be changed if the interface is down:
> > >
> > >     ip link set dev can0 down
> > >     ethtool --set-priv-flags can0 err-rst-on-open {off|on}
> > >     ip link set dev can0 up
> > >
> > > Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> >
> > I'm a big fan of bringing the device into a well known good state during
> > ifup. What would be the reasons/use cases to not reset the device?
> 
> Because by default either slcand and slcan_attach don't reset the
> error states, but you must use the `-f' option to do so. So, I
> followed this use case.

Is this a CAN bus error state, like Bus Off or some controller (i.e. non
CAN related) error?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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