commit e686748e09f87af6c2abedd371e17b61d37ccb8c
author Kapil Gupta <kapgupta@qti.qualcomm.com> Sun Jun 26 13:31:37 2016 +0530
committer Satyanarayana Dash <sadash@codeaurora.org> Fri Jul 01 13:47:21 2016 +0530
tree 9fda70cf9e51579fcf4b7dd9490b78ceb655d306
parent c104363dffa060bdf0944892e92b1406446fdd5f

wlan: Add support for PER based roaming #1

In congested environments, it could be possible that in station
mode client gets good RSSI from AP however it's not able to
transfer data at good rates. DUT should roam to a better AP if
available, if it faces congestion in home channel.

Following changes are added for this functionality:
1. Add changes to monitor Rx and Tx rates to trigger roam scan
in case data rates are low below a preconfigured value.
2. Implement a new AP selection algorithm which will consider AP
capability, channel conditions and RSSI to select new bss.

Add required HDD changes for same.

Change-Id: I8dfa2bdc9643cb597b58b919489eb36eff83621d
CRs-Fixed: 1031345

CORE/HDD/src/wlan_hdd_assoc.c

diff --git a/CORE/HDD/src/wlan_hdd_assoc.c b/CORE/HDD/src/wlan_hdd_assoc.c
index b3889c0..5dacc1a 100644
--- a/CORE/HDD/src/wlan_hdd_assoc.c
+++ b/CORE/HDD/src/wlan_hdd_assoc.c
@@ -1144,6 +1144,14 @@
     }
 
      hdd_wmm_adapter_clear(pAdapter);
+     /* Clear PER based roam stats */
+#ifdef WLAN_FEATURE_ROAM_SCAN_OFFLOAD
+     if (sme_IsFeatureSupportedByFW(PER_BASED_ROAMING) &&
+         (WLAN_HDD_INFRA_STATION == pAdapter->device_mode) &&
+         pHddCtx->cfg_ini && pHddCtx->cfg_ini->isPERRoamEnabled &&
+         pHddCtx->cfg_ini->isPERRoamRxPathEnabled)
+         sme_unset_per_roam_rxconfig(pHddCtx->hHal);
+#endif
 #if defined(WLAN_FEATURE_VOWIFI_11R)
      sme_FTReset(WLAN_HDD_GET_HAL_CTX(pAdapter));
 #endif
@@ -1595,6 +1603,22 @@
         pAdapter->maxRateFlags = pRoamInfo->maxRateFlags;
         // Save the connection info from CSR...
         hdd_connSaveConnectInfo( pAdapter, pRoamInfo, eCSR_BSS_TYPE_INFRASTRUCTURE );
+
+#ifdef WLAN_FEATURE_ROAM_SCAN_OFFLOAD
+        if (sme_IsFeatureSupportedByFW(PER_BASED_ROAMING) &&
+            (WLAN_HDD_INFRA_STATION == pAdapter->device_mode) &&
+            !hddDisconInProgress &&
+            pHddCtx->cfg_ini && pHddCtx->cfg_ini->isPERRoamEnabled &&
+            pHddCtx->cfg_ini->isPERRoamRxPathEnabled)
+            sme_set_per_roam_rxconfig(pHddCtx->hHal,
+                 pHddStaCtx->conn_info.staId[0],
+                 pHddCtx->cfg_ini->rateDownThreshold,
+                 pHddCtx->cfg_ini->rateUpThreshold,
+                 pHddCtx->cfg_ini->PERroamTriggerPercent,
+                 pHddCtx->cfg_ini->PERroamRxPktsThreshold,
+                 pHddCtx->cfg_ini->waitPeriodForNextPERScan);
+#endif
+
 #ifdef FEATURE_WLAN_WAPI
         if ( pRoamInfo->u.pConnectedProfile->AuthType == eCSR_AUTH_TYPE_WAPI_WAI_CERTIFICATE ||
                 pRoamInfo->u.pConnectedProfile->AuthType == eCSR_AUTH_TYPE_WAPI_WAI_PSK )