From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from nbd.name ([46.4.11.11]:35885 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751996Ab3EIUdE (ORCPT ); Thu, 9 May 2013 16:33:04 -0400 Message-ID: <518C07F6.9040003@openwrt.org> (sfid-20130509_223309_367279_12803035) Date: Thu, 09 May 2013 22:32:54 +0200 From: Felix Fietkau MIME-Version: 1.0 To: Simon Wunderlich CC: linux-wireless@vger.kernel.org, Johannes Berg , Mathias Kretschmer , Simon Wunderlich Subject: Re: [PATCH 2/8] mac80211: fix various components for the new 5 and 10 MHz widths References: <1368123036-22721-1-git-send-email-a> <1368123036-22721-3-git-send-email-a> <518BEB88.5090600@openwrt.org> <20130509194620.GA24307@pandem0nium> In-Reply-To: <20130509194620.GA24307@pandem0nium> Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On 2013-05-09 9:46 PM, Simon Wunderlich wrote: > Hello Felix, > > On Thu, May 09, 2013 at 08:31:36PM +0200, Felix Fietkau wrote: >> On 2013-05-09 8:10 PM, a@pandem0nium wrote: >> > From: Simon Wunderlich >> > >> > This is a collection of minor fixes: >> > * don't allow HT IEs in IBSS for 5/10 MHz >> > * don't allow HT IEs in Mesh for 5/10 MHz >> > * consider 5 and 10 MHz channels when downgrading >> > * don't try HT rates for 5 and 10 MHz channels when selecting rates >> Why? HT rates work with 5/10 MHz just fine. > > Hm, to be honest I did not try - IEEE 802.11-2012 only mentions 5 and > 10 MHz channels in section 18 (OFDM PHY) according with timing and other > parameters, but nothing like this (as far as I see) is mentioned in > Section 20 (High Throughput PHY). > > On the other hand, it appears that AR9xxx based chipsets also support > 2.4 GHz rates (DSSS, ERP-OFDM), so I can imagine also HT rates can > be supported as well. > > The question is, how would we handle that? Allow HT IEs also for 5 and > 10 MHz, and behave like it would be a 20 MHz channel? Yes, I had 5/10 MHz running that way with a debugfs hack just fine. > Are there any > other WiFi chipsets which support 5/10 MHz, should we consider them > (maybe they don't support that)? No idea. - Felix