netdev - Re: [PATCH 6/7] net: add the AF

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Message-ID: <9A7272FCC21A8A47ADC46F543B78FB03173CC2A2@VWAGWOXD0402.vw.vwg>
Date:	Mon, 19 Aug 2013 15:00:46 +0000
From:	"Schmitt, Sven (EVM/E)" <Sven.Schmitt@...kswagen.de>
To:	"'b.spranger@...utronix.de'" <b.spranger@...utronix.de>
CC:	"'netdev@...r.kernel.org'" <netdev@...r.kernel.org>
Subject: Re: [PATCH 6/7] net: add the AF_FLEXRAY protocol

On 13.08.2013 11:08, Benedikt Spranger wrote:
> FlexRay is a networking technology used in automotive fields as
> successor of the Controller Area Network (CAN). It provides the
> core functionality and a RAW protocol driver.
>
> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
> ---
> Documentation/networking/00-INDEX             |   2 +
> Documentation/networking/flexray.txt          |  24 ++
> include/linux/flexray.h                       | 168 ++++++++

Hello Benedikt,

thanks for bringing flexray to linux.

Some general remarks/questions:
- how can errors (crc, boundary, tx on not empty slot) be transported by the frame like in a CAN frame (/include/uapi/linux/can/error.h):
	-> canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */ ? 
	...there is no more space in the id field in your frame definition.
- what about special bus content like wakeup pattern (WUP), collision avoidance symbol (CAS) and media test symbols (MTS). These are interesting for logging use cases.
- do we need the crc fields? What happens if the cr check fails (-> error flag)? Do we need this information then?
- do we need the reserved bit? (there is none in CAN frame definition)

Best regards,
Sven

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