Re: Setting up flexcan mailboxes in Linux

Re: Setting up flexcan mailboxes in Linux

[Marc Kleine-Budde]

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Hey Emil,

please use the linux-can mailinglst for CAN related questions.

On 07/07/2015 11:59 AM, Emil Fors wrote:
> my name is Emil and I am trying to configure a Toradex Apalis iMX6q
> module. I need to set up the flexcan mailboxes in order to filter out
> messages I'm not interested in. I have CAN communication working using
> the libsocketcan library written by one Luotao Fu, who seems to be a
> colleague of yours? However, that library doesn't seem to provide me
> with control over mailbox configuration. Could you please advise as to
> how I'd best proceed? I noted that the library is (C) 2009, perhaps it
> is outdated? Do you know of a more recent and perhaps better solution?

Hardware filtering is not supported on an driver so far. But we have an
idea how to implement this.

However you can make use of the software filtering via CAN_RAW_FILTER.
See
http://lxr.free-electrons.com/source/Documentation/networking/can.txt#L433
for more information.

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


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Re: SV: Setting up flexcan mailboxes in Linux

[Marc Kleine-Budde]

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Hey Emil,

please just use the mailinglist (CC'ed).

On 07/09/2015 10:33 AM, Emil Fors wrote:
> thank you. I am trying out the software filtering now. It doesn't
> work (lets everything throuh regardless of what filters I set), but I
> won't bother you with that. Going to check out that mailing list you
> mentioned, see if anyone knows what the problem might be.

Please share your filter setup code. The software filters are working in
general. Older version have the limitation that you might get a CAN
frame twice, if you've set up multiple filters that match.

Marc

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


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RE: SV: Setting up flexcan mailboxes in Linux

[Emil Fors]

Hi,

never mind, I figured it out. The error was an unrelated technicality.
Thanks for the help, and the pointer to this mailing list!

Cheers,
Emil

-----Original Message-----
From: Marc Kleine-Budde [mailto:mkl@pengutronix.de] 
Sent: Thursday, July 09, 2015 10:38 AM
To: Emil Fors
Cc: linux-can
Subject: Re: SV: Setting up flexcan mailboxes in Linux

Hey Emil,

please just use the mailinglist (CC'ed).

On 07/09/2015 10:33 AM, Emil Fors wrote:
> thank you. I am trying out the software filtering now. It doesn't work 
> (lets everything throuh regardless of what filters I set), but I won't 
> bother you with that. Going to check out that mailing list you 
> mentioned, see if anyone knows what the problem might be.

Please share your filter setup code. The software filters are working in general. Older version have the limitation that you might get a CAN frame twice, if you've set up multiple filters that match.

Marc

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