Re: [PATCH 2/3] mac80211: Add a timeout for frames in the RX reorder buffer

[Marcel Holtmann <marcel@holtmann.org>]

Hi Jouni,

> > > I can confirm that this used to be a regular situation between my X200
> > > and a D-Link access point.
> 
> Which D-Link model is that AP? I think I should try to get one of those
> added to me test bed.. ;-)

from the WPS information element:

	 * Version: 1.0
	 * Manufacturer: D-Link Systems
	 * Model: DIR-615
	 * Device name: Wireless N Router
	 * Config methods: Label

I bought it over a year ago in Canada. It is actually my second of these
since I fried the first one :)

> > so I finally got the debug output for you. Took only over a day :)
> 
> Thanks! Would you happen to have timing information available for these
> (e.g., from klogd)? It looks like the AP is sending out an ADDBA Request
> to update some parameters, but we currently ignore that request.
> However, at least in this particular case, our RX reorder bug head_seq
> matches with the ssn from the ADDBA Request, so I'm not sure whether
> ignoring the ADDBA contents is really causing harm here (anyway, we
> should really process these updates, too).
> 
> The timeouts on RX reorder frames look similar to what I have seen in my
> tests and the workaround was indeed trying to address that type of
> issue, so it is nice to hear that it helped in this case, too.

I don't have the timing details since my Fedora for some reason doesn't
log them to the filesystem. I have to fix that.

Also re-producing this is not as simple as you think. I have no idea
when this happens. There is no way to actually trigger it from my side.

Regards

Marcel