[PATCH] hostapd: Don't force HT Mixed Mode for non-GF STAs

[Johannes Berg]

On Wed, 2011-03-02 at 09:53 +0100, Helmut Schaa wrote:
> Am Mittwoch, 2. M?rz 2011 schrieb Johannes Berg:
> > On Wed, 2011-03-02 at 09:37 +0100, Helmut Schaa wrote:
> > > Currently hostapd will force HT Mixed Mode if at least one non-GF STA is
> > > associated. This will force _all_ HT transmissions to be protected.
> > > 
> > > 802.11n-2009 doesn't require HT Mixed Mode to be used in case of non-GF
> > > STAs but instead the HT information element contains a flag if non-GF
> > > STAs are present. All STAs are required to protect GF transmissions in
> > > that case. Hence, setting HT Mixed mode if non-GF STAs are present is
> > > superfluous.
> > 
> > It seems like this would still be relevant for the AP's TX?
> 
> Why? hostapd will configure the new ht_opmode (including the non-GF-STA flag)
> to the driver. And the driver should do the right thing and enable protection only
> for GF transmissions in that case, no?

Not sure really, this HT stuff isn't as well defined as we'd like :-)
I'd suspect it doesn't.

johannes