From: Vincent MAILHOL <mailhol.vincent@wanadoo.fr>
To: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Cc: linux-kernel@vger.kernel.org,
Amarula patchwork <linux-amarula@amarulasolutions.com>,
michael@amarulasolutions.com,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jakub Kicinski <kuba@kernel.org>,
Jiri Slaby <jirislaby@kernel.org>,
Marc Kleine-Budde <mkl@pengutronix.de>,
Paolo Abeni <pabeni@redhat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Wolfgang Grandegger <wg@grandegger.com>,
linux-can@vger.kernel.org, netdev@vger.kernel.org,
Max Staudt <max@enpas.org>
Subject: Re: [RFC PATCH 00/13] can: slcan: extend supported features
Date: Tue, 7 Jun 2022 21:19:54 +0900 [thread overview]
Message-ID: <CAMZ6Rq+QpY23bmB4n1DfqaGgxU=i8sKm1Ee9R18xGSv9H5yMVQ@mail.gmail.com> (raw)
In-Reply-To: <20220607094752.1029295-1-dario.binacchi@amarulasolutions.com>
+CC: Max Staudt <max@enpas.org>
On Tue. 7 Jun. 2022 at 18:47, Dario Binacchi
<dario.binacchi@amarulasolutions.com> wrote:
> This series originated as a result of CAN communication tests for an
> application using the USBtin adapter (https://www.fischl.de/usbtin/).
> The tests showed some errors but for the driver everything was ok.
> Also, being the first time I used the slcan driver, I was amazed that
> it was not possible to configure the bitrate via the ip tool.
> For these two reasons, I started looking at the driver code and realized
> that it didn't use the CAN network device driver interface.
>
> Starting from these assumptions, I tried to:
> - Use the CAN network device driver interface.
> - Set the bitrate via the ip tool.
> - Send the open/close command to the adapter from the driver.
> - Add ethtool support to reset the adapter errors.
> - Extend the protocol to forward the adapter CAN communication
> errors and the CAN state changes to the netdev upper layers.
>
> Except for the protocol extension patches (i. e. forward the adapter CAN
> communication errors and the CAN state changes to the netdev upper
> layers), the whole series has been tested. Testing the extension
> protocol patches requires updating the adapter firmware. Before modifying
> the firmware I think it makes sense to know if these extensions can be
> considered useful.
>
> Before applying the series I used these commands:
>
> slcan_attach -f -s6 -o /dev/ttyACM0
> slcand ttyACM0 can0
> ip link set can0 up
>
> After applying the series I am using these commands:
>
> slcan_attach /dev/ttyACM0
> slcand ttyACM0 can0
> ip link set dev can0 down
> ip link set can0 type can bitrate 500000
> ethtool --set-priv-flags can0 err-rst-on-open on
> ip link set dev can0 up
In his CAN327 driver, Max manages to bring the can0 device without the
need of dedicated user space daemon by using line discipline
(ldattach):
https://lore.kernel.org/linux-can/20220602213544.68273-1-max@enpas.org/
Isn't the same feasible with slcan so that we completely remove the
dependency toward slcand?
Max what do you think of this?
> Now there is a clearer separation between serial line and CAN,
> but above all, it is possible to use the ip and ethtool commands
> as it happens for any CAN device driver. The changes are backward
> compatible, you can continue to use the slcand and slcan_attach
> command options.
Yours sincerely,
Vincent Mailhol
next prev parent reply other threads:[~2022-06-07 12:20 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-07 9:47 [RFC PATCH 00/13] can: slcan: extend supported features Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 01/13] can: slcan: use the BIT() helper Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 02/13] can: slcan: use netdev helpers to print out messages Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 03/13] can: slcan: use the alloc_can_skb() helper Dario Binacchi
2022-06-07 10:15 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 04/13] can: slcan: use CAN network device driver API Dario Binacchi
2022-06-07 11:13 ` Marc Kleine-Budde
2022-06-08 16:42 ` Dario Binacchi
2022-06-09 7:07 ` Marc Kleine-Budde
2022-06-12 21:24 ` Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 05/13] can: slcan: simplify the device de-allocation Dario Binacchi
2022-06-07 20:45 ` Oliver Hartkopp
2022-06-07 9:47 ` [RFC PATCH 06/13] can: slcan: allow to send commands to the adapter Dario Binacchi
2022-06-09 7:16 ` Marc Kleine-Budde
2022-06-11 21:43 ` Dario Binacchi
2022-06-12 10:39 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 07/13] can: slcan: set bitrate by CAN device driver API Dario Binacchi
2022-06-07 10:09 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 08/13] can: slcan: send the open command to the adapter Dario Binacchi
2022-06-07 11:00 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 09/13] can: slcan: send the close " Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 10/13] can: slcan: move driver into separate sub directory Dario Binacchi
2022-06-07 9:47 ` [RFC PATCH 11/13] can: slcan: add ethtool support to reset adapter errors Dario Binacchi
2022-06-07 10:52 ` Marc Kleine-Budde
2022-06-08 16:33 ` Dario Binacchi
2022-06-09 6:38 ` Marc Kleine-Budde
2022-06-09 7:24 ` Dario Binacchi
2022-06-09 8:01 ` Marc Kleine-Budde
2022-06-09 8:52 ` Dario Binacchi
2022-06-10 10:51 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 12/13] can: slcan: extend the protocol with error info Dario Binacchi
2022-06-07 10:56 ` Marc Kleine-Budde
2022-06-07 9:47 ` [RFC PATCH 13/13] can: slcan: extend the protocol with CAN state info Dario Binacchi
2022-06-07 10:13 ` Marc Kleine-Budde
2022-06-07 10:27 ` [RFC PATCH 00/13] can: slcan: extend supported features Vincent MAILHOL
2022-06-07 10:39 ` Marc Kleine-Budde
2022-06-07 12:20 ` Vincent MAILHOL
2022-06-07 12:19 ` Vincent MAILHOL [this message]
2022-06-07 23:55 ` Max Staudt
2022-06-08 0:15 ` Max Staudt
2022-06-08 7:19 ` Marc Kleine-Budde
2022-06-08 12:55 ` Max Staudt
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