qcacld-3.0: Add ini support for rssi abs thresh for the candidate AP

The RSSI value of the candidate AP should be higher than rssi_abs_thresh
to roam to the AP. 0 means no absolute minimum RSSI is required.

The value sent to the firmware is the offset from the noise floor in dB.

Change-Id: Ic956a184ac9a241e310b5d46ee6c70b9d1962446
CRs-Fixed: 2118279

core/hdd/inc/wlan_hdd_cfg.h

@@ -1584,6 +1584,29 @@ enum hdd_dot11_mode {
 #define CFG_ROAM_RSSI_DIFF_MAX                              (30)
 #define CFG_ROAM_RSSI_DIFF_DEFAULT                          (5)
 
+/*
+ * <ini>
+ * rssi_abs_thresh - The min RSSI of the candidate AP to consider roam
+ * @Min: -96
+ * @Max: 0
+ * @Default: 0
+ *
+ * The RSSI value of the candidate AP should be higher than rssi_abs_thresh
+ * to roam to the AP. 0 means no absolute minimum RSSI is required.
+ *
+ * Related: None
+ *
+ * Supported Feature: Roaming
+ *
+ * Usage: External
+ *
+ * </ini>
+ */
+#define CFG_ROAM_RSSI_ABS_THRESHOLD_NAME        "rssi_abs_thresh"
+#define CFG_ROAM_RSSI_ABS_THRESHOLD_MIN         (-96)
+#define CFG_ROAM_RSSI_ABS_THRESHOLD_MAX         (0)
+#define CFG_ROAM_RSSI_ABS_THRESHOLD_DEFAULT     (0)
+
 /*
  * <ini>
  * gRoamScanNProbes - Sets the number of probes to be sent for firmware roaming
@@ -13651,6 +13674,7 @@ struct hdd_config {
 #endif
 	bool isFastTransitionEnabled;
 	uint8_t RoamRssiDiff;
+	int32_t rssi_abs_thresh;
 	bool isWESModeEnabled;
 	uint32_t pmkid_modes;
 	bool isRoamOffloadScanEnabled;

core/hdd/src/wlan_hdd_cfg.c

@@ -1116,6 +1116,13 @@ struct reg_table_entry g_registry_table[] = {
 			     CFG_ROAM_RSSI_DIFF_MAX,
 			     cb_notify_set_roam_rssi_diff, 0),
 
+	REG_VARIABLE(CFG_ROAM_RSSI_ABS_THRESHOLD_NAME, WLAN_PARAM_SignedInteger,
+		     struct hdd_config, rssi_abs_thresh,
+		     VAR_FLAGS_OPTIONAL | VAR_FLAGS_RANGE_CHECK_ASSUME_DEFAULT,
+		     CFG_ROAM_RSSI_ABS_THRESHOLD_DEFAULT,
+		     CFG_ROAM_RSSI_ABS_THRESHOLD_MIN,
+		     CFG_ROAM_RSSI_ABS_THRESHOLD_MAX),
+
 	REG_DYNAMIC_VARIABLE(CFG_ENABLE_WES_MODE_NAME, WLAN_PARAM_Integer,
 			     struct hdd_config, isWESModeEnabled,
 			     VAR_FLAGS_OPTIONAL |
@@ -6276,6 +6283,8 @@ void hdd_cfg_print(struct hdd_context *hdd_ctx)
 	hdd_mawc_cfg_log(hdd_ctx);
 	hdd_debug("Name = [RoamRssiDiff] Value = [%u] ",
 		  hdd_ctx->config->RoamRssiDiff);
+	hdd_debug("Name = [%s] Value = [%u] ", CFG_ROAM_RSSI_ABS_THRESHOLD_NAME,
+		  hdd_ctx->config->rssi_abs_thresh);
 	hdd_debug("Name = [isWESModeEnabled] Value = [%u] ",
 		  hdd_ctx->config->isWESModeEnabled);
 	hdd_debug("Name = [pmkidModes] Value = [0x%x] ",
@@ -8646,6 +8655,7 @@ QDF_STATUS hdd_set_sme_config(struct hdd_context *hdd_ctx)
 	smeConfig->csrConfig.isFastTransitionEnabled =
 		pConfig->isFastTransitionEnabled;
 	smeConfig->csrConfig.RoamRssiDiff = pConfig->RoamRssiDiff;
+	smeConfig->csrConfig.rssi_abs_thresh = pConfig->rssi_abs_thresh;
 	smeConfig->csrConfig.isWESModeEnabled = pConfig->isWESModeEnabled;
 	smeConfig->csrConfig.isRoamOffloadScanEnabled =
 		pConfig->isRoamOffloadScanEnabled;

core/mac/inc/sir_api.h

@@ -3213,6 +3213,7 @@ typedef struct sSirRoamOffloadScanReq {
 	uint8_t OpportunisticScanThresholdDiff;
 	uint8_t RoamRescanRssiDiff;
 	uint8_t RoamRssiDiff;
+	int32_t rssi_abs_thresh;
 	uint8_t ChannelCacheType;
 	uint8_t Command;
 	uint8_t reason;

core/sme/inc/csr_api.h

@@ -1212,6 +1212,7 @@ typedef struct tagCsrConfigParam {
 	struct mawc_params csr_mawc_config;
 	uint8_t isFastTransitionEnabled;
 	uint8_t RoamRssiDiff;
+	int32_t rssi_abs_thresh;
 	bool isWESModeEnabled;
 	tCsrNeighborRoamConfigParams neighborRoamConfig;
 	/*

core/sme/inc/csr_internal.h

@@ -532,6 +532,7 @@ struct csr_config {
 #endif
 	uint8_t isFastTransitionEnabled;
 	uint8_t RoamRssiDiff;
+	int32_t rssi_abs_thresh;
 	bool nRoamPrefer5GHz;
 	bool nRoamIntraBand;
 	bool isWESModeEnabled;

core/sme/src/csr/csr_api_roam.c

@@ -2657,6 +2657,8 @@ QDF_STATUS csr_change_default_config_param(tpAniSirGlobal pMac,
 		pMac->roam.configParam.isFastTransitionEnabled =
 			pParam->isFastTransitionEnabled;
 		pMac->roam.configParam.RoamRssiDiff = pParam->RoamRssiDiff;
+		pMac->roam.configParam.rssi_abs_thresh =
+						pParam->rssi_abs_thresh;
 		pMac->roam.configParam.nRoamPrefer5GHz =
 			pParam->nRoamPrefer5GHz;
 		pMac->roam.configParam.nRoamIntraBand = pParam->nRoamIntraBand;
@@ -3030,6 +3032,7 @@ QDF_STATUS csr_get_config_param(tpAniSirGlobal pMac, tCsrConfigParam *pParam)
 		     sizeof(tCsr11rConfigParams));
 	pParam->isFastTransitionEnabled = cfg_params->isFastTransitionEnabled;
 	pParam->RoamRssiDiff = cfg_params->RoamRssiDiff;
+	pParam->rssi_abs_thresh = cfg_params->rssi_abs_thresh;
 	pParam->nRoamPrefer5GHz = cfg_params->nRoamPrefer5GHz;
 	pParam->nRoamIntraBand = cfg_params->nRoamIntraBand;
 	pParam->isWESModeEnabled = cfg_params->isWESModeEnabled;
@@ -17775,6 +17778,7 @@ csr_create_roam_scan_offload_request(tpAniSirGlobal mac_ctx,
 	req_buf->RoamRescanRssiDiff =
 		roam_info->cfgParams.nRoamRescanRssiDiff;
 	req_buf->RoamRssiDiff = mac_ctx->roam.configParam.RoamRssiDiff;
+	req_buf->rssi_abs_thresh = mac_ctx->roam.configParam.rssi_abs_thresh;
 	req_buf->reason = reason;
 	req_buf->NeighborScanTimerPeriod =
 		roam_info->cfgParams.neighborScanPeriod;

core/wma/src/wma_scan_roam.c

@@ -1316,6 +1316,10 @@ static void wma_roam_scan_fill_ap_profile(tSirRoamOffloadScanReq *roam_req,
 		profile->rsn_mcastmgmtcipherset =
 			profile->rsn_mcastcipherset;
 		profile->rssi_threshold = roam_req->RoamRssiDiff;
+		if (roam_req->rssi_abs_thresh)
+			profile->rssi_abs_thresh =
+				roam_req->rssi_abs_thresh -
+						WMA_NOISE_FLOOR_DBM_DEFAULT;
 #ifdef WLAN_FEATURE_11W
 		if (roam_req->ConnectedNetwork.mfp_enabled)
 			profile->flags |= WMI_AP_PROFILE_FLAG_PMF;