P2P: Add option for adding extra delay to p2p_find

A new optional delay=<search delay in milliseconds> parameter can now be
used with p2p_find command to request an extra delay between search
iterations. This can be used, e.g., to make p2p_find friendlier to
concurrent operations by avoiding it from taking 100% of the radio
resources.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/drivers/driver_test.c

@@ -2824,7 +2824,7 @@ static int wpa_driver_test_p2p_find(void *priv, unsigned int timeout, int type)
 	wpa_printf(MSG_DEBUG, "%s(timeout=%u)", __func__, timeout);
 	if (!drv->p2p)
 		return -1;
-	return p2p_find(drv->p2p, timeout, type, 0, NULL, NULL);
+	return p2p_find(drv->p2p, timeout, type, 0, NULL, NULL, 0);
 }
 
 

src/p2p/p2p.c

@@ -920,7 +920,7 @@ static void p2p_free_req_dev_types(struct p2p_data *p2p)
 int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	     enum p2p_discovery_type type,
 	     unsigned int num_req_dev_types, const u8 *req_dev_types,
-	     const u8 *dev_id)
+	     const u8 *dev_id, unsigned int search_delay)
 {
 	int res;
 
@@ -954,6 +954,8 @@ int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	p2p->find_type = type;
 	p2p_device_clear_reported(p2p);
 	p2p_set_state(p2p, P2P_SEARCH);
+	p2p->search_delay = search_delay;
+	p2p->in_search_delay = 0;
 	eloop_cancel_timeout(p2p_find_timeout, p2p, NULL);
 	p2p->last_p2p_find_timeout = timeout;
 	if (timeout)
@@ -1009,7 +1011,7 @@ int p2p_other_scan_completed(struct p2p_data *p2p)
 		"now that previous scan was completed");
 	if (p2p_find(p2p, p2p->last_p2p_find_timeout, p2p->find_type,
 		     p2p->num_req_dev_types, p2p->req_dev_types,
-		     p2p->find_dev_id) < 0)
+		     p2p->find_dev_id, p2p->search_delay) < 0)
 		return 0;
 	return 1;
 }
@@ -2940,6 +2942,14 @@ int p2p_listen_end(struct p2p_data *p2p, unsigned int freq)
 			p2p_set_timeout(p2p, 0, 100000);
 			return 1;
 		}
+		if (p2p->search_delay) {
+			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Delay "
+				"search operation by %u ms",
+				p2p->search_delay);
+			p2p_set_timeout(p2p, p2p->search_delay / 1000,
+					(p2p->search_delay % 1000) * 1000);
+			return 1;
+		}
 		p2p_search(p2p);
 		return 1;
 	}
@@ -3134,6 +3144,16 @@ static void p2p_state_timeout(void *eloop_ctx, void *timeout_ctx)
 		/* Check if we timed out waiting for PD req */
 		if (p2p->pending_action_state == P2P_PENDING_PD)
 			p2p_timeout_prov_disc_req(p2p);
+		if (p2p->search_delay && !p2p->in_search_delay) {
+			wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Delay "
+				"search operation by %u ms",
+				p2p->search_delay);
+			p2p->in_search_delay = 1;
+			p2p_set_timeout(p2p, p2p->search_delay / 1000,
+					(p2p->search_delay % 1000) * 1000);
+			break;
+		}
+		p2p->in_search_delay = 0;
 		p2p_search(p2p);
 		break;
 	case P2P_CONNECT:

src/p2p/p2p.h

@@ -830,12 +830,13 @@ enum p2p_discovery_type {
  *	containing num_req_dev_types * WPS_DEV_TYPE_LEN bytes; %NULL if no
  *	requested device types.
  * @dev_id: Device ID to search for or %NULL to find all devices
+ * @search_delay: Extra delay in milliseconds between search iterations
  * Returns: 0 on success, -1 on failure
  */
 int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	     enum p2p_discovery_type type,
 	     unsigned int num_req_dev_types, const u8 *req_dev_types,
-	     const u8 *dev_id);
+	     const u8 *dev_id, unsigned int search_delay);
 
 /**
  * p2p_stop_find - Stop P2P Find (Device Discovery)

src/p2p/p2p_i.h

@@ -427,6 +427,10 @@ struct p2p_data {
 
 	u8 go_timeout;
 	u8 client_timeout;
+
+	/* Extra delay in milliseconds between search iterations */
+	unsigned int search_delay;
+	int in_search_delay;
 };
 
 /**

wpa_supplicant/README-P2P

@@ -71,7 +71,8 @@ over the main control interface.
 
 Device Discovery
 
-p2p_find [timeout in seconds] [type=<social|progressive>]
+p2p_find [timeout in seconds] [type=<social|progressive>] \
+	[dev_id=<addr>] [delay=<search delay in ms>]
 
 The default behavior is to run a single full scan in the beginning and
 then scan only social channels. type=social will scan only social
@@ -81,6 +82,11 @@ progressively one channel at the time in the Search state rounds. This
 will help in finding new groups or groups missed during the initial
 full scan.
 
+The optional dev_id option can be used to specify a single P2P peer to
+search for. The optional delay parameter can be used to request an extra
+delay to be used between search iterations (e.g., to free up radio
+resources for concurrent operations).
+
 p2p_listen [timeout in seconds]
 
 Start Listen-only state (become discoverable without searching for

wpa_supplicant/ctrl_iface.c

@@ -2958,6 +2958,7 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 	enum p2p_discovery_type type = P2P_FIND_START_WITH_FULL;
 	u8 dev_id[ETH_ALEN], *_dev_id = NULL;
 	char *pos;
+	unsigned int search_delay = 0;
 
 	if (os_strstr(cmd, "type=social"))
 		type = P2P_FIND_ONLY_SOCIAL;
@@ -2972,7 +2973,14 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 		_dev_id = dev_id;
 	}
 
-	return wpas_p2p_find(wpa_s, timeout, type, 0, NULL, _dev_id);
+	pos = os_strstr(cmd, "delay=");
+	if (pos) {
+		pos += 6;
+		search_delay = atoi(pos);
+	}
+
+	return wpas_p2p_find(wpa_s, timeout, type, 0, NULL, _dev_id,
+			     search_delay);
 }
 
 

wpa_supplicant/dbus/dbus_new_handlers_p2p.c

@@ -127,7 +127,7 @@ DBusMessage * wpas_dbus_handler_p2p_find(DBusMessage *message,
 	}
 
 	wpas_p2p_find(wpa_s, timeout, type, num_req_dev_types, req_dev_types,
-		      NULL);
+		      NULL, 0);
 	os_free(req_dev_types);
 	return reply;
 

wpa_supplicant/p2p_supplicant.c

@@ -3950,7 +3950,7 @@ static void wpas_p2p_clear_pending_action_tx(struct wpa_supplicant *wpa_s)
 int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 		  enum p2p_discovery_type type,
 		  unsigned int num_req_dev_types, const u8 *req_dev_types,
-		  const u8 *dev_id)
+		  const u8 *dev_id, unsigned int search_delay)
 {
 	wpas_p2p_clear_pending_action_tx(wpa_s);
 	wpa_s->p2p_long_listen = 0;
@@ -3965,7 +3965,8 @@ int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 	wpa_supplicant_cancel_sched_scan(wpa_s);
 
 	return p2p_find(wpa_s->global->p2p, timeout, type,
-			num_req_dev_types, req_dev_types, dev_id);
+			num_req_dev_types, req_dev_types, dev_id,
+			search_delay);
 }
 
 

wpa_supplicant/p2p_supplicant.h

@@ -53,7 +53,7 @@ enum p2p_discovery_type;
 int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 		  enum p2p_discovery_type type,
 		  unsigned int num_req_dev_types, const u8 *req_dev_types,
-		  const u8 *dev_id);
+		  const u8 *dev_id, unsigned int search_delay);
 void wpas_p2p_stop_find(struct wpa_supplicant *wpa_s);
 int wpas_p2p_listen(struct wpa_supplicant *wpa_s, unsigned int timeout);
 int wpas_p2p_assoc_req_ie(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,