Return-path: Received: from mail-ie0-f169.google.com ([209.85.223.169]:37711 "EHLO mail-ie0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752003Ab3KZUT7 (ORCPT ); Tue, 26 Nov 2013 15:19:59 -0500 Received: by mail-ie0-f169.google.com with SMTP id e14so10503011iej.28 for ; Tue, 26 Nov 2013 12:19:58 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <201311261550.14953.sw@simonwunderlich.de> References: <1385409372-4229-1-git-send-email-janusz.dziedzic@tieto.com> <1385409372-4229-4-git-send-email-janusz.dziedzic@tieto.com> <201311261550.14953.sw@simonwunderlich.de> Date: Tue, 26 Nov 2013 21:19:58 +0100 Message-ID: (sfid-20131126_212002_708510_91AA0510) Subject: Re: [PATCH v3 4/4] cfg80211: DFS use 10 minutes CAC when weather channels From: Janusz Dziedzic To: Simon Wunderlich Cc: Janusz Dziedzic , linux-wireless , Johannes Berg Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: 2013/11/26 Simon Wunderlich : > >> When nominal bandwidth falls completely or partly >> within the band 5600MHz to 5650MHz the CAC time shall >> be 10 minutes. >> This is ETSI requirement. FCC forbids weather channels usage. > > Although it is correct to handle that with longer times and all, I don't think > we should enable weather channels at all, not even for ETSI. Unlike "normal" > channels, it requires 99.99% detection rate in CAC, which is (I think) > practically impossible. > > I guess we need ath9k (or other drivers, maybe ath10k too) to disallow CAC on > these channels, if we know that the drivers can do it? Although I don't think > it's technically possible ... > ath.ko already disable weather channels by default. But in case driver will pass DFS certification (meet all requirements) - why not use weather channels? BR Janusz