From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guy Harris Subject: Re: multi-antenna handling Date: Tue, 24 Jun 2014 18:53:48 -0700 Message-ID: References: <1345481425.4459.46.camel@jlt3.sipsolutions.net> <1373273952.8312.7.camel@jlt4.sipsolutions.net> Mime-Version: 1.0 (Mac OS X Mail 6.6 \(1510\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <1373273952.8312.7.camel-8Nb76shvtaUJvtFkdXX2HixXY32XiHfO@public.gmane.org> Sender: radiotap-owner-sUITvd46vNxg9hUCZPvPmw@public.gmane.org To: Johannes Berg Cc: "radiotap-sUITvd46vNxg9hUCZPvPmw@public.gmane.org" List-Id: radiotap@radiotap.org On Jul 8, 2013, at 1:59 AM, Johannes Berg = wrote: > FWIW, I've now implemented this in Linux (in mac80211), although I = start > a new radiotap namespace for each antenna, separate from the first = one, > so you'll see >=20 > * any of: TSF, flags, rate, channel, MCS, a-mpdu, VHT, ... > (new radiotap namespace) > * ant signal: -40 dBm > * anntenna: 0 > (new radiotap namespace) > * ant signal: -45 dBm > * anntenna: 1 > ... for however many antennas/chains there are. So is the idea that, in the first radiotap-namespace block, there will = be no per-antenna information such as the antenna signal - the only = per-antenna information will be in the subsequent namespace blocks? Context: somebody asked on ask.wireshark.org about a capture from a = D-Link router running OpenWRT; he claims that the router has 2 antennas, = but the capture has 3 antenna signal strength values, the first of which = is in the first radiotap namespace: = http://ask.wireshark.org/questions/33994/why-there-are-3-rssi-values-in-th= e-radiotap-header-for-a-dual-antenna-wireless-card=