qcacld-3.0: Add a new INI bg_rssi_threshold

FW triggers roaming based on the RSSI score of AP(s) available
after background scan. Currently, the host does not configure
the value of bg_rssi_threshold RSSI. This results in ping-pong
roaming after background scan, even though candidate AP
RSSI is not better than 5dbm than connected AP.

Fix is to configure the value of bg_rssi_threshold via new
INI "bg_rssi_threshold" and configuring default value of
INI as 5dB.

Min: 0
Max: 100
Default: 5

Change-Id: Ib710e294c8b33ff4903d41453e3b55f02daf53ae
CRs-Fixed: 2763962

components/mlme/dispatcher/inc/cfg_mlme_lfr.h

@@ -1250,6 +1250,34 @@
 	CFG_VALUE_OR_DEFAULT, \
 	"Enable roam based on rssi")
 
+/*
+ * <ini>
+ * bg_rssi_threshold - To set RSSI Threshold for BG scan roaming
+ * @Min: 0
+ * @Max: 100
+ * @Default: 5
+ *
+ * This INI is used to set the value of rssi threshold to trigger roaming
+ * after background scan. To trigger roam after bg scan, value of rssi of
+ * candidate AP should be higher by this threshold than the rssi of the
+ * currrently associated AP.
+ *
+ * Related: RoamRssiDiff
+ *
+ * Supported Feature: Roaming
+ *
+ * Usage: External
+ *
+ * </ini>
+ */
+#define CFG_LFR_ROAM_BG_RSSI_TH CFG_INI_UINT( \
+	"bg_rssi_threshold", \
+	0, \
+	100, \
+	5, \
+	CFG_VALUE_OR_DEFAULT, \
+	"Enable roam based on rssi after BG scan")
+
 /*
  * <ini>
  * gWESModeEnabled - Enable WES mode
@@ -2893,6 +2921,7 @@
 	CFG(CFG_LFR_MAWC_FEATURE_ENABLED) \
 	CFG(CFG_LFR_FAST_TRANSITION_ENABLED) \
 	CFG(CFG_LFR_ROAM_RSSI_DIFF) \
+	CFG(CFG_LFR_ROAM_BG_RSSI_TH) \
 	CFG(CFG_LFR_ENABLE_WES_MODE) \
 	CFG(CFG_LFR_ROAM_SCAN_OFFLOAD_ENABLED) \
 	CFG(CFG_LFR_NEIGHBOR_SCAN_CHANNEL_LIST) \

components/mlme/dispatcher/inc/wlan_mlme_public_struct.h

@@ -1724,6 +1724,7 @@ struct wlan_mlme_lfr_cfg {
 	uint32_t roam_preauth_retry_count;
 	uint32_t roam_preauth_no_ack_timeout;
 	uint8_t roam_rssi_diff;
+	uint8_t bg_rssi_threshold;
 	bool roam_scan_offload_enabled;
 	uint32_t neighbor_scan_timer_period;
 	uint32_t neighbor_scan_min_timer_period;