netdev - Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

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Message-ID: <338664525.20151104180316@cogentembedded.com>
Date:	Wed, 4 Nov 2015 18:03:16 +0300
From:	Vostrikov Andrey <andrey.vostrikov@...entembedded.com>
To:	Marek Vasut <marex@...x.de>
CC:	Aleksander Morgado <aleksander@...ksander.es>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [RFC][PATCH] net: arinc429: Add ARINC-429 stack

Hi, Marek.

> About the parity -- can we add some flag into the datagram to indicate we
> want hardware to calculate the parity for that particular datagram for us?
> And we'd also need to indicate what type of parity. I dunno if this is worth
> the hassle.
This  is HW configuration property, it does not belong to  datagram. Also for TX
channels,  parity could  be  two  kinds:  odd and even, for RX it is only
on/off.

Parity  is  not  the  only property that needs to be configured in HW,
following could be needed as well,
- label bit flipping (on or off)
- rate change (low / high)
-  label  filters  and  label  priority matching (this could be HoltIC
specific)

I  suppose  all  these  properties  are  configured  only  once, at interface
initialization.

-- 
Best regards,
Andrey Vostrikov

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