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Re: Why is wmm_param required for HT40- in mlme.c

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On 01/31/2011 03:03 AM, Johannes Berg wrote:
On Sun, 2011-01-30 at 09:34 -0800, Ben Greear wrote:
On 01/30/2011 01:36 AM, Johannes Berg wrote:
On Sat, 2011-01-29 at 21:38 -0800, Ben Greear wrote:
I tried to set up hostapd to do HT40-, but for whatever reason,
it's not sending any wmm_param options, so the stations will not
associate with HT40- enabled due to the check below.

Is it really *reqired* that wmm_param exist to enable HT mode?

   From mlme.c:
	if (elems.ht_info_elem&&   elems.wmm_param&&
	(sdata->local->hw.queues>= 4)&&
	!(ifmgd->flags&   IEEE80211_STA_DISABLE_11N))
		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
					       cbss->bssid, ap_ht_cap_flags);

802.11n-2009 says it is required.

Do you know the pertinent section, or some keywords to search for?  I'm
unable to find anything useful.

No, I got confused. 802.11n says an HT STA is a QoS STA (5.2.9), but in
practice WMM is tested/certified instead of QoS.

So maybe we can remove that check for wmm_param, but put in a printk
to warn users that their AP is probably mis-configured?

Thanks,
Ben


johannes


--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com
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