[Bluez-devel] Re: [PATCH 2.6] link trigger for AODV and +

[Marcel Holtmann <marcel@holtmann.org>]

Hi Jean,

> 	This is a patch I wrote a couple of months back, and I would
> like to submit it for inclusion in the BlueZ stack. The reason I think
> we should include that is that the patch has minimal footprint and
> offer a feature unavailable by other means...
> 
> 	The idea is that this patch add an event that is trigger when
> a connection is likely to fail, but before the connection get
> disconnected. This is similar to the TxDrop iwevent implemented for
> 802.11 (in Wireless Extensions).
> 	In many cases, you don't want to use LinkSupervisionTimeout,
> because it disconnect the connection before you have time to take
> corrective action (i.e. game over).
> 	The main use is for Ad-Hoc routing protocol (mesh) such as
> AODV. In the litterature, this is called a "link trigger". I can give
> you real world example of people using the TxDrop iwevent in AODV
> implementations.
> 	Another example would be to use this event to generate a
> warning to the user that his connection is about to drop. Because
> LinkSupervisionTimeout is so large, most users would be able to use
> this warning to get back into range or away from the interferer
> without loosing the connection.
> 	I could go at lenght on why this is useful and why this is the
> way to implement it, but I don't want to waste your time.

no problem, I got the point. However I am not sure about applying your
patch. I don't like the way the event is propagated. It is a connection
related event and so I like to send it to the sockets that are using
that ACL connection. Or at least I should introduce the per device stack
internal events.

Another question is, do we need a compile option for it? Is there any
disadvantage to compile it always and disable by default?

> 	Patch has been tested in kernel from 2.6.1 to 2.6.8. I also
> have a patch for 2.4.X. Please apply...

I would include it into my next -mh patch for testing, but the 2.4
series should be closed for new features.

Regards

Marcel




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