[PATCH] wpa_supplicant: Enable HT40 support for AP mode

[Rajkumar Manoharan]

On Mon, Jul 09, 2012 at 06:50:04PM +0300, Arik Nemtsov wrote:
> On Mon, Jul 9, 2012 at 7:51 AM, Rajkumar Manoharan
> <rmanohar at qca.qualcomm.com> wrote:
> > Right now HT40 mode is not enabled for AP/P2P GO mode in wpa_supplicant.
> > If the HW is capable of 40MHz channel width and user specifies the
> > secondary channel posision, lets enable the HT40 mode in wpa_s. This
> > patch also enables HT40 support for P2P mode.
> >
> > ap_ht40_mode : -1 -> HT40MINUS, 1 -> HT40PLUS
> >
> > Signed-hostap: Rajkumar Manoharan <rmanohar at qca.qualcomm.com>
> > ---
> >  wpa_supplicant/ap.c               | 3 +++
> >  wpa_supplicant/config.c           | 5 ++++-
> >  wpa_supplicant/config.h           | 7 +++++++
> >  wpa_supplicant/config_file.c      | 4 ++++
> >  wpa_supplicant/p2p_supplicant.c   | 2 --
> >  wpa_supplicant/wpa_supplicant.c   | 2 ++
> >  wpa_supplicant/wpa_supplicant_i.h | 1 +
> >  7 files changed, 21 insertions(+), 3 deletions(-)
> >
> > diff --git a/wpa_supplicant/ap.c b/wpa_supplicant/ap.c
> > index f9e0045..25a07d5 100644
> > --- a/wpa_supplicant/ap.c
> > +++ b/wpa_supplicant/ap.c
> > @@ -99,6 +99,9 @@ static int wpa_supplicant_conf_ap(struct wpa_supplicant *wpa_s,
> >
> >                 if (!no_ht && mode && mode->ht_capab) {
> >                         conf->ieee80211n = 1;
> > +                       if (mode->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)
> > +                               conf->secondary_channel =
> > +                                       wpa_s->global->ap_ht40_mode;
> 
> Can you tell me why HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET is not enabled
> in the capabilities white-list?
> (just below this code).
> 
> I must be missing something, otherwise I'm not sure how this works..
>
The HT40 mode should be enabled if and only if the hw has IEEE80211_HT_CAP_SUP_WIDTH_20_40
capability. This info was exported by wpa_driver_nl80211_get_hw_feature_data.
I don't understand why it has be added in white-list?

Jouni,

Please correct me if wrong.

-Rajkumar