[RFC] wpa_supplicant: Enable HT40 support for AP mode

[Arik Nemtsov]

On Thu, Jul 5, 2012 at 3:31 PM, 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;

I'm not sure how this alone will help. A couple lines below
HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET is stripped from the capabilities
(currently isn't in the white-list).
If that one is added to the whitelist its worth also adding other HT40
related caps (like HT_CAP_INFO_DSSS_CCK40MHZ).

>
>                         /*
>                          * white-list capabilities that won't cause issues
> diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
> index a68b31e..31a5d39 100644
> --- a/wpa_supplicant/config.c
> +++ b/wpa_supplicant/config.c
> @@ -2921,7 +2921,10 @@ static const struct global_parse_data global_fields[] = {
>         { INT_RANGE(wps_nfc_dev_pw_id, 0x10, 0xffff), 0 },
>         { BIN(wps_nfc_dh_pubkey), 0 },
>         { BIN(wps_nfc_dh_privkey), 0 },
> -       { BIN(wps_nfc_dev_pw), 0 }
> +       { BIN(wps_nfc_dev_pw), 0 },
> +#ifdef CONFIG_IEEE80211N
> +       { INT(ap_ht40_mode), 0 },
> +#endif
>  };
>
>  #undef FUNC
> diff --git a/wpa_supplicant/config.h b/wpa_supplicant/config.h
> index 46c4da2..7bb326d 100644
> --- a/wpa_supplicant/config.h
> +++ b/wpa_supplicant/config.h
> @@ -661,6 +661,13 @@ struct wpa_config {
>          * wps_nfc_dh_pubkey - NFC Device Password for password token
>          */
>         struct wpabuf *wps_nfc_dev_pw;
> +#ifdef CONFIG_IEEE80211N
> +       /**
> +        * ap_ht40_mode - Specify HT40 mode secondary channel position
> +        *                HT40+/- mainly for AP mode
> +        */
> +       int ap_ht40_mode;
> +#endif
>  };
>
>
> diff --git a/wpa_supplicant/config_file.c b/wpa_supplicant/config_file.c
> index 8badc7b..3182d29 100644
> --- a/wpa_supplicant/config_file.c
> +++ b/wpa_supplicant/config_file.c
> @@ -875,6 +875,10 @@ static void wpa_config_write_global(FILE *f, struct wpa_config *config)
>         write_global_bin(f, "wps_nfc_dh_pubkey", config->wps_nfc_dh_pubkey);
>         write_global_bin(f, "wps_nfc_dh_privkey", config->wps_nfc_dh_privkey);
>         write_global_bin(f, "wps_nfc_dev_pw", config->wps_nfc_dev_pw);
> +#ifdef CONFIG_IEEE80211N
> +       if (config->ap_ht40_mode)
> +               fprintf(f, "ap_ht40_mode=%d\n", config->ap_ht40_mode);
> +#endif
>  }
>
>  #endif /* CONFIG_NO_CONFIG_WRITE */
> diff --git a/wpa_supplicant/p2p_supplicant.c b/wpa_supplicant/p2p_supplicant.c
> index 218ed2f..0a9fc1f 100644
> --- a/wpa_supplicant/p2p_supplicant.c
> +++ b/wpa_supplicant/p2p_supplicant.c
> @@ -2231,10 +2231,8 @@ static int wpas_p2p_setup_channels(struct wpa_supplicant *wpa_s,
>         struct p2p_oper_class_map op_class[] = {
>                 { HOSTAPD_MODE_IEEE80211G, 81, 1, 13, 1, BW20 },
>                 { HOSTAPD_MODE_IEEE80211G, 82, 14, 14, 1, BW20 },
> -#if 0 /* Do not enable HT40 on 2 GHz for now */
>                 { HOSTAPD_MODE_IEEE80211G, 83, 1, 9, 1, BW40PLUS },
>                 { HOSTAPD_MODE_IEEE80211G, 84, 5, 13, 1, BW40MINUS },
> -#endif
>                 { HOSTAPD_MODE_IEEE80211A, 115, 36, 48, 4, BW20 },
>                 { HOSTAPD_MODE_IEEE80211A, 124, 149, 161, 4, BW20 },
>                 { HOSTAPD_MODE_IEEE80211A, 116, 36, 44, 8, BW40PLUS },
> diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
> index c65dc3c..22b063b 100644
> --- a/wpa_supplicant/wpa_supplicant.c
> +++ b/wpa_supplicant/wpa_supplicant.c
> @@ -2534,6 +2534,8 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
>                         return -1;
>                 }
>
> +               wpa_s->global->ap_ht40_mode = wpa_s->conf->ap_ht40_mode;
> +
>                 /*
>                  * Override ctrl_interface and driver_param if set on command
>                  * line.
> diff --git a/wpa_supplicant/wpa_supplicant_i.h b/wpa_supplicant/wpa_supplicant_i.h
> index b608f29..6c4c507 100644
> --- a/wpa_supplicant/wpa_supplicant_i.h
> +++ b/wpa_supplicant/wpa_supplicant_i.h
> @@ -239,6 +239,7 @@ struct wpa_global {
>                 WPA_CONC_PREF_STA,
>                 WPA_CONC_PREF_P2P
>         } conc_pref;
> +       int ap_ht40_mode;
>  };
>
>
> --
> 1.7.11.1
>
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