netdev - Re: [PATCH] can: j1939: convert PGN structure to a table

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Message-ID: <32bad1a4-4daf-8ebe-e469-175e0339b292@pengutronix.de>
Date:   Thu, 22 Oct 2020 12:33:45 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     yegorslists@...glemail.com, linux-can@...r.kernel.org
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] can: j1939: convert PGN structure to a table

On 10/22/20 12:29 PM, yegorslists@...glemail.com wrote:
> From: Yegor Yefremov <yegorslists@...glemail.com>
> 
> Use table markup to show the PGN structure.
> 
> Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
> ---
>  Documentation/networking/j1939.rst | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/networking/j1939.rst b/Documentation/networking/j1939.rst
> index faf2eb5c5052..f3fb9d880910 100644
> --- a/Documentation/networking/j1939.rst
> +++ b/Documentation/networking/j1939.rst
> @@ -71,10 +71,14 @@ PGN
>  
>  The PGN (Parameter Group Number) is a number to identify a packet. The PGN
>  is composed as follows:
> -1 bit  : Reserved Bit
> -1 bit  : Data Page
> -8 bits : PF (PDU Format)
> -8 bits : PS (PDU Specific)
> +
> +  ============  ==============  ===============  =================
> +  PGN
> +  ----------------------------------------------------------------
> +  25            24              23 ... 16        15 ... 8

ICan you add a row description that indicated that these numbers are. They are
probably bit positions within the CAN-ID?

> +  ============  ==============  ===============  =================
> +  R (Reserved)  DP (Data Page)  PF (PDU Format)  PS (PDU Specific)
> +  ============  ==============  ===============  =================
>  
>  In J1939-21 distinction is made between PDU1 format (where PF < 240) and PDU2
>  format (where PF >= 240). Furthermore, when using the PDU2 format, the PS-field
> 

Marc

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