[PATCH v2 3/3] P2P: support preferred GO band

[Matthew Wang]

From: Matthew Wang <matthewmwang at google.com>

Allow specifying preferred GO band in addition to frequency. If a band
is specified, the first two scans will be limited to only non-DFS
channels to shorten scan times, and the next two will scan the entire
band.

Signed-off-by: Matthew Wang <matthewmwang at chromium.org>
---
 wpa_supplicant/p2p_supplicant.c |  8 +++---
 wpa_supplicant/scan.c           | 43 ++++++++++++++++++++++++++-------
 wpa_supplicant/scan.h           |  3 ++-
 3 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/wpa_supplicant/p2p_supplicant.c b/wpa_supplicant/p2p_supplicant.c
index dc240140d..c9b32210e 100644
--- a/wpa_supplicant/p2p_supplicant.c
+++ b/wpa_supplicant/p2p_supplicant.c
@@ -342,15 +342,15 @@ void wpas_p2p_scan_freqs(struct wpa_supplicant *wpa_s,
 			 bool include_6ghz)
 {
 	wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
-				params, false, false);
+				params, false, false, false);
 	wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
-				params, false, false);
+				params, false, false, false);
 	wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211AD,
-				params, false, false);
+				params, false, false, false);
 	if (!wpa_s->conf->p2p_6ghz_disable &&
 	    is_p2p_allow_6ghz(wpa_s->global->p2p) && include_6ghz)
 		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
-					params, true, true);
+					params, true, true, false);
 }
 
 
diff --git a/wpa_supplicant/scan.c b/wpa_supplicant/scan.c
index cdf12f938..9128fafd0 100644
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -476,11 +476,33 @@ static void wpa_supplicant_optimize_freqs(
 		 */
 		if (params->freqs == NULL && wpa_s->p2p_in_invitation < 5 &&
 		    wpa_s->p2p_invite_go_freq > 0) {
-			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
-				wpa_s->p2p_invite_go_freq);
-			params->freqs = os_calloc(2, sizeof(int));
-			if (params->freqs)
-				params->freqs[0] = wpa_s->p2p_invite_go_freq;
+			if (wpa_s->p2p_invite_go_freq == 2 ||
+			    wpa_s->p2p_invite_go_freq == 5) {
+				wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred band %d GHz during invitation",
+					wpa_s->p2p_invite_go_freq);
+				enum hostapd_hw_mode mode;
+				if (wpa_s->hw.modes == NULL)
+					return;
+				mode = wpa_s->p2p_invite_go_freq == 5 ?
+				       HOSTAPD_MODE_IEEE80211A :
+				       HOSTAPD_MODE_IEEE80211G;
+				if (wpa_s->p2p_in_invitation <= 2)
+					wpa_add_scan_freqs_list(wpa_s, mode,
+								params, false,
+								true);
+				if (params->freqs == NULL ||
+				    (params->freqs && params->freqs[0] == 0))
+					wpa_add_scan_freqs_list(wpa_s, mode,
+								params, false,
+								false);
+			} else {
+				wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
+					wpa_s->p2p_invite_go_freq);
+				params->freqs = os_calloc(2, sizeof(int));
+				if (params->freqs)
+					params->freqs[0] =
+					    wpa_s->p2p_invite_go_freq;
+			}
 		}
 		wpa_s->p2p_in_invitation++;
 		if (wpa_s->p2p_in_invitation > 20) {
@@ -738,7 +760,8 @@ static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
 int wpa_add_scan_freqs_list(struct wpa_supplicant *wpa_s,
 			    enum hostapd_hw_mode band,
 			    struct wpa_driver_scan_params *params,
-			    bool is_6ghz, bool only_6ghz_psc)
+			    bool is_6ghz, bool only_6ghz_psc,
+			    bool exclude_radar)
 {
 	/* Include only supported channels for the specified band */
 	struct hostapd_hw_modes *mode;
@@ -763,6 +786,8 @@ int wpa_add_scan_freqs_list(struct wpa_supplicant *wpa_s,
 	for (i = 0; i < mode->num_channels; i++) {
 		if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
 			continue;
+		if (exclude_radar && (mode->channels[i].flag & HOSTAPD_CHAN_RADAR))
+			continue;
 
 		if (is_6ghz && only_6ghz_psc &&
 		    !is_6ghz_psc_frequency(mode->channels[i].freq))
@@ -786,13 +811,13 @@ static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
 
 	if (wpa_s->setband_mask & WPA_SETBAND_5G)
 		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, params,
-					false, false);
+					false, false, false);
 	if (wpa_s->setband_mask & WPA_SETBAND_2G)
 		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G, params,
-					false, false);
+					false, false, false);
 	if (wpa_s->setband_mask & WPA_SETBAND_6G)
 		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, params,
-					true, false);
+					true, false, false);
 }
 
 
diff --git a/wpa_supplicant/scan.h b/wpa_supplicant/scan.h
index 6e074f48a..30f43951c 100644
--- a/wpa_supplicant/scan.h
+++ b/wpa_supplicant/scan.h
@@ -92,6 +92,7 @@ void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s);
 int wpa_add_scan_freqs_list(struct wpa_supplicant *wpa_s,
 			    enum hostapd_hw_mode band,
 			    struct wpa_driver_scan_params *params,
-			    bool is_6ghz, bool only_6ghz_psc);
+			    bool is_6ghz, bool only_6ghz_psc,
+			    bool exclude_radar);
 
 #endif /* SCAN_H */
-- 
2.39.0.314.g84b9a713c41-goog