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

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Message-ID: <50FC2EE4.3080705@gmail.com>
Date:	Sun, 20 Jan 2013 18:52:36 +0100
From:	Stephan Gatzka <stephan.gatzka@...il.com>
To:	linux1394-devel@...ts.sourceforge.net, netdev@...r.kernel.org
CC:	yoshfuji@...ux-ipv6.org, stefanr@...6.in-berlin.de,
	davem@...emloft.net
Subject: [RFC:] struct net_device_ops: Add function pointer to fill device
 specific ndisc information

I've implemented IPv6 over firewire. Right now I'm facing the problem 
that the corresponding RFC3146 requires very firewire specific 
information sent during neighborhood discovery.

There was already a discussion on the linux1394 mailing list 
(http://sourceforge.net/mailarchive/message.php?msg_id=30342089 and 
http://sourceforge.net/mailarchive/forum.php?thread_name=50E4A3E5.8080304%40gmail.com&forum_name=linux1394-devel) 

During that discussion all participants agreed that it makes no sense to 
introduce a dependency between the ndisc code and the firewire net driver.

So the most appealing option seems to be to introduce on more callback 
routine either in struct net_device or struct net_device_ops:

int (*ndo_fill_llao)(void *llao);

Because I'm not so familiar with the structure of the whole network 
infrastructure in Linux, I need some advice if struct net_device or 
struct net_device_ops is the right place.

Maybe it's worth to generalize this and do the same for IPv4/ARP because 
right now the ARP packets are mangled in the firewire net driver.

Nevertheless, I've to admit that right now it seems that only IPv6 over 
firewire requires such a callback routine.

Regards,

Stephan
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