Re: ath9k/ath10k DFS testing / certification

From: Simon Wunderlich <sw@simonwunderlich.de>
To: Adrian Chadd <adrian@freebsd.org>
Cc: Jean-Pierre Tosoni <jp.tosoni@acksys.fr>,
	Cedric VONCKEN <cedric.voncken@acksys.fr>,
	"ath10k@lists.infradead.org" <ath10k@lists.infradead.org>
Subject: Re: ath9k/ath10k DFS testing / certification
Date: Tue, 24 Jan 2017 16:10:55 +0100	[thread overview]
Message-ID: <9646101.djguVEVbIO@prime> (raw)
In-Reply-To: <CAJ-Vmo=WYvi5ZL_VDr623cFkp0oocDYkui346_mtb91cthsXMA@mail.gmail.com>

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Hi Adrian,

On Tuesday, January 24, 2017 7:05:58 AM CET Adrian Chadd wrote:
> hi!
> 
> On 24 January 2017 at 03:16, Simon Wunderlich <sw@simonwunderlich.de> wrote:
> > Hi Adrian,
> > 
> > I've been doing DFS pre-tests back in December 2016. We did AP tests for a
> > 9880 based AP for ETSI and FCC region. We had two small patches for making
> > the> 
> > tests less painful (in hostapd and mac80211):
> >  * disable CSA on incoming radar, that is keep on staying on the operating
> > 
> > channels. That makes continouos testing of radar signals much easier
> > (usually you test like 10 radars in a row), since we don't had to reboot
> > the device all the time.
> > 
> >  * shorten CAC to 3 seconds, because waiting 60 seconds is also taking
> >  some
> > 
> > time
> 
> Do you have those patches available somewhere?
> 

not sure if I can release them, so no. :)

But both were rather trivial, the first one is a change in hostapd, the latter 
in mac80211.

> > All FCC tests pass, at least from the radar detection point. ETSI had a
> > problem with one of the patterns. We used iperf UDP tests to generate
> > load,
> > but will probably switch to another tool in the next round (or tune it),
> > since it seems to send packets too bursty, which could be the cause for
> > the failed ETSI test.
> 
> Ok. What are you using to generate radar patterns for testing?
> 

We used 300k+ EUR Rohde&Schwarz equipment of the certification lab. :)

I don't have a pattern generation available at my home, but I remember 
discussions that it's possible to get something useful and cheap using SDRs 
(with cheap I mean in the <5k$ range). I believe Zefir had tried this route 
...

> > Thanks for the info on the scan bug, we discovered that too, but thought
> > we
> > could fix it in mac80211 (but never really followed up). Please keep me in
> > the loop when this is fixed. :)
> :
> :) I'll punt this to QCA if/when the right time arises and see if
> 
> they'll fix ath10k firmware.

Excellent!

     Simon

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