Return-path: Received: from mail-gy0-f174.google.com ([209.85.160.174]:49387 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932747Ab1JDP0y (ORCPT ); Tue, 4 Oct 2011 11:26:54 -0400 Received: by gyg10 with SMTP id 10so589094gyg.19 for ; Tue, 04 Oct 2011 08:26:54 -0700 (PDT) From: Christian Lamparter To: Adrian Chadd Subject: Re: [RFC 5/6] ath9k: enable DFS pulse detection Date: Tue, 4 Oct 2011 17:26:40 +0200 Cc: Zefir Kurtisi , "Luis R. Rodriguez" , linux-wireless@vger.kernel.org, ath9k-devel@lists.ath9k.org, kgiori@qca.qualcomm.com, nbd@openwrt.org References: <1317637758-11907-1-git-send-email-zefir.kurtisi@neratec.com> <201110041642.54453.chunkeey@googlemail.com> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Message-Id: <201110041726.40722.chunkeey@googlemail.com> (sfid-20111004_172708_579919_C376E3C6) Sender: linux-wireless-owner@vger.kernel.org List-ID: On Tuesday, October 04, 2011 04:50:42 PM Adrian Chadd wrote: > Also whilst I'm at it, "SPECTRUM_MANAGEMENT" is a very broad flag to set. Hm, 802.11-2007 5.4.4 "Spectrum management services" explicitly mentions that both services TPC and DFS are required in some regulatory domains for operation in the 5 GHz band. > For example: you may not want to do DFS on the AR5416 NICs because > (as documented in the open hal and earlier ath9k bits) there isn't > support for radar pulses on the ext channel. So even if you had a > successful DFS algorithm for this NIC, you'd have to somehow tell > the DFS machinery that HT40+DFS channels aren't supported but > HT20+DFS channels are. well, that's a pity. We do have seperated HT feature sets for each band but they are not seperated by operation mode... [ Just for fun: Do you know how the AR5418 handled radars in the proprietary turbo mode in the 5 GHz band? And how does Atheros own driver/stack/etc. deals with this limitation? After all Unex sold/sells the DNBA-81 on their product page as: "DNBA-81 is a 802.11n 2x3 2-stream a/b/g dual band wifi Cardbus designed specifically for laptops and *access points*/ home gateways/consumer electronics/multimedia entertainment devices/peripherals with standard Cardbus slot." ] Regards, Chr