netdev - Re: [RFC:] struct net_device_ops: Add function pointer to fill device specific ndisc information

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Date:	Mon, 21 Jan 2013 20:25:31 +0100
From:	Stephan Gatzka <stephan.gatzka@...il.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	netdev <netdev@...r.kernel.org>,
	linux1394-devel@...ts.sourceforge.net,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC:] struct net_device_ops: Add function pointer to fill device
 specific ndisc information


> Two net_device instances on one 1394 card would be awkward:  They would
> have to share one instance of isochronous reception context (for reception
> of asynchronous 1394 streams; those are used for broadcasts and
> multicasts).  Such a sharing is surely possible, but if double net_device
> instantiation can be avoided, then avoid it.
>
> Not to mention the user interface problem of having two netifs, one which
> only supports IPv4 and another one which only supports IPv6.  So far I
> never had IPv6 configured into a Linux kernel, but I suppose that folks
> are used to be able to use eth0 etc. for both protocols.

Full ack. And that's the reason why I feel very uncomfortable with a 
Yoshifujis hardware address extensions by fifo_addr, spd, and max_rec.

This seems possible with a single netdevice for IPv4/6 only if we 
_always_ use the same fifo address for both IPv4 and IPv6. Do we all 
agree on that?

Stephan
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