qcacld-3.0: Handle HI-RSSI scan trigger in 2Ghz connection

The issue is: If STA is connected to a 2.4Gh AP with such a
high RSSI (say around -30dBm) then STA immediately triggers
a high RSSI roam scan.

As per the current design, when connected AP's RSSI is better
than the (gNeighborLookupThreshold - gRoamScanHiRssiDelta),
STA should not trigger HI-RSSI roam scan.

Here default value of INI "gNeighborLookupThreshold" is 78 and
default value of INI: "gRoamScanHiRssiDelta" is 10.

Fix is to allow HI-RSSI roam trigger only if AP RSSI is worse
than gNeighborLookupThreshold - gRoamScanHiRssiDelta.

Change-Id: I7a0d2302a71656b5238bfeea8c2a6ebcd3716ab9
CRs-Fixed: 3128235

components/umac/mlme/connection_mgr/dispatcher/inc/wlan_cm_roam_public_struct.h

@@ -671,6 +671,7 @@ enum roam_cfg_param {
 	IS_SINGLE_PMK,
 	LOST_LINK_RSSI,
 	ROAM_BAND,
+	HI_RSSI_SCAN_RSSI_DELTA,
 };
 
 /**

components/umac/mlme/connection_mgr/dispatcher/src/wlan_cm_roam_api.c

@@ -794,6 +794,9 @@ QDF_STATUS wlan_cm_roam_cfg_get_value(struct wlan_objmgr_psoc *psoc,
 	case ROAM_BAND:
 		dst_config->uint_value = rso_cfg->roam_band_bitmask;
 		break;
+	case HI_RSSI_SCAN_RSSI_DELTA:
+		dst_config->uint_value = src_cfg->hi_rssi_scan_rssi_delta;
+		break;
 	default:
 		mlme_err("Invalid roam config requested:%d", roam_cfg_type);
 		status = QDF_STATUS_E_FAILURE;

core/mac/src/pe/lim/lim_process_sme_req_messages.c

@@ -2933,6 +2933,9 @@ lim_fill_pe_session(struct mac_context *mac_ctx, struct pe_session *session,
 	uint8_t programmed_country[REG_ALPHA2_LEN + 1];
 	enum reg_6g_ap_type power_type_6g;
 	bool ctry_code_match;
+	struct cm_roam_values_copy temp;
+	uint32_t neighbor_lookup_threshold;
+	uint32_t hi_rssi_scan_rssi_delta;
 
 	/*
 	 * Update the capability here itself as this is used in
@@ -3044,7 +3047,20 @@ lim_fill_pe_session(struct mac_context *mac_ctx, struct pe_session *session,
 	lim_fill_11r_params(mac_ctx, session , ese_ver_present);
 	lim_fill_ese_params(mac_ctx, session, ese_ver_present);
 
-	if (WLAN_REG_IS_24GHZ_CH_FREQ(bss_desc->chan_freq)) {
+	wlan_cm_roam_cfg_get_value(mac_ctx->psoc, session->vdev_id,
+				   NEIGHBOUR_LOOKUP_THRESHOLD, &temp);
+	neighbor_lookup_threshold = temp.uint_value;
+
+	wlan_cm_roam_cfg_get_value(mac_ctx->psoc, session->vdev_id,
+				   HI_RSSI_SCAN_RSSI_DELTA, &temp);
+	hi_rssi_scan_rssi_delta = temp.uint_value;
+
+	if (WLAN_REG_IS_24GHZ_CH_FREQ(bss_desc->chan_freq) &&
+	    (abs(bss_desc->rssi) >
+	     (neighbor_lookup_threshold - hi_rssi_scan_rssi_delta))) {
+		pe_debug("Enabling HI_RSSI, rssi: %d lookup_th: %d, delta:%d",
+			 bss_desc->rssi, neighbor_lookup_threshold,
+			 hi_rssi_scan_rssi_delta);
 		wlan_cm_set_disable_hi_rssi(mac_ctx->pdev, session->vdev_id,
 					    false);
 	} else {