Commit 4a817aa7 authored May 09, 2014 by Johannes Berg

mac80211: allow VHT with peers not capable of 40MHz



There are two (related) issues with this.

One case, reported by Michal, is related to hostap: it unsets the
20/40 capability bit for stations that associate when it's in 20
MHz mode.

The other case, reported by Eyal, is that some APs like Netgear
R6300v2 and probably others based on the BCM4360 chipset can be
configured for doing VHT at 20Mhz. In this case the beacon has
a VHT IE but the HT cap indicates transmitter only support 20Mhz.

In both of these cases, we currently avoid VHT and use only HT
this means we can't use the highest rates (MCS8), so fixing this
leads to throughput improvements.

Reported-by: Michal Kazior <michal.kazior@tieto.com>
Reported-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

parent e669ba2d

net/mac80211/vht.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -129,9 +129,12 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
		if (!vht_cap_ie \|\| !sband->vht_cap.vht_supported)
		return;

		/* A VHT STA must support 40 MHz */
		if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
		return;
		/*
		* A VHT STA must support 40 MHz, but if we verify that here
		* then we break a few things - some APs (e.g. Netgear R6300v2
		* and others based on the BCM4360 chipset) will unset this
		* capability bit when operating in 20 MHz.
		*/

		vht_cap->vht_supported = true;

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