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

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Date:	Tue, 3 Nov 2015 16:15:00 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Aleksander Morgado <aleksander@...ksander.es>
Cc:	Marek Vasut <marex@...x.de>,
	Vostrikov Andrey <andrey.vostrikov@...entembedded.com>,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	"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

On 11/03/2015 04:06 PM, Aleksander Morgado wrote:
>> What about maintainability? Why take care of two almost identical
>> subsystems? With making one stack "simpler" you increase, from my point
>> of view, the costs of maintaining even more. If you fix problems in one
>> stack you have to adopt the other, too.
> 
> If they can share common code, that's fine, that probably can be
> worked around if needed. My main issues are actually with all the
> behavior that CAN supports and doesn't make much sense in ARINC, like
> the complex ID filtering scheme for example (ARINC just requires 256
> bits for a minimum filter),

I think it should be possible to use a simple/different filter mechanism
for ARINC packages.

> or the duplex TX/RX setup for channels
> (channels are either RX or TX, not both), or the local
> echoing/loopback (which wouldn't make much sense for TX-only
> channels).

Local echo/loopback comes in two flavours:
- Other socket receive local generate frames, too.
  This is interesting if you want to merge two ARINC node on single
  device.
- Sending socket receives send frame, too. This is useful if you need
  the feedback that the frame has _really_ been send, not just pushed
  into the networking stack.

> The minimum subset of features required by an ARINC driver
> is actually very small. Trying to "fit" ARINC as a subset of CAN may
> actually be harder than keeping it separate maintainability wise.
> Maybe the issue here is that the original patch is too CAN-like while
> it shouldn't be, don't know.

regards,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
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