qcacld-3.0: Properly handle channel switch through ioctl

qcacld-2.0 to qcacld-3.0 propagation.

1)Validate channel switch w.r.t concurrency rules set and switch
  channel only if there is no channel interference.
2)Disable channel bonding in 2.4Ghz on switching channel to 2.4Ghz band
  to avoid violating OBSS feature.

Change-Id: I81992b2c2876a32eba52010e72c4300608067e58
CRs-Fixed: 809527

core/sap/src/sap_module.c

@@ -598,6 +598,33 @@ void wlan_sap_set_vht_ch_width(void *ctx, uint32_t vht_channel_width)
 	sap_ctx->ch_params.ch_width = vht_channel_width;
 }
 
+/**
+ * wlan_sap_validate_channel_switch() - validate target channel switch w.r.t
+ *      concurreny rules set to avoid channel interference.
+ * @hal - Hal context
+ * @sap_ch - channel to switch
+ * @sap_context - sap session context
+ *
+ * Return: true if there is no channel interference else return false
+ */
+#ifdef FEATURE_WLAN_MCC_TO_SCC_SWITCH
+static bool wlan_sap_validate_channel_switch(tHalHandle hal, uint16_t sap_ch,
+		ptSapContext sap_context)
+{
+	return sme_validate_sap_channel_switch(
+			hHal,
+			sap_ch,
+			sap_context->csr_roamProfile.phyMode,
+			sap_context->cc_switch_mode,
+			sap_context->sessionId);
+}
+#else
+static inline bool wlan_sap_validate_channel_switch(tHalHandle hal,
+		uint16_t sap_ch, ptSapContext sap_context)
+{
+	return true;
+}
+#endif
 /**
  * wlansap_start_bss() - start BSS
  * @pCtx: Pointer to the global cds context; a handle to SAP's control block
@@ -1399,6 +1426,8 @@ wlansap_set_channel_change_with_csa(void *p_cds_gctx, uint32_t targetChannel)
 	tWLAN_SAPEvent sapEvent;
 	tpAniSirGlobal pMac = NULL;
 	void *hHal = NULL;
+	bool valid;
+	tSmeConfigParams *sme_config;
 
 	sapContext = CDS_GET_SAP_CB(p_cds_gctx);
 	if (NULL == sapContext) {
@@ -1425,6 +1454,18 @@ wlansap_set_channel_change_with_csa(void *p_cds_gctx, uint32_t targetChannel)
 		(cds_get_channel_state(targetChannel) ==
 			CHANNEL_STATE_DFS &&
 		!cds_concurrent_open_sessions_running()))) {
+		/*
+		 * validate target channel switch w.r.t various concurrency
+		 * rules set.
+		 */
+		valid = wlan_sap_validate_channel_switch(hHal, targetChannel,
+				sapContext);
+		if (!valid) {
+			CDF_TRACE(CDF_MODULE_ID_SAP, CDF_TRACE_LEVEL_ERROR,
+					FL("Channel switch to %u is not allowed due to concurrent channel interference"),
+					targetChannel);
+			return CDF_STATUS_E_FAULT;
+		}
 		/*
 		 * Post a CSA IE request to SAP state machine with
 		 * target channel information and also CSA IE required
@@ -1432,6 +1473,27 @@ wlansap_set_channel_change_with_csa(void *p_cds_gctx, uint32_t targetChannel)
 		 * state.
 		 */
 		if (eSAP_STARTED == sapContext->sapsMachine) {
+			/*
+			 * currently OBSS scan is done in hostapd, so to avoid
+			 * SAP coming up in HT40 on channel switch we are
+			 * disabling channel bonding in 2.4Ghz.
+			 */
+			if (targetChannel <= RF_CHAN_14) {
+				sme_config =
+					cdf_mem_malloc(sizeof(*sme_config));
+				if (!sme_config) {
+					CDF_TRACE(CDF_MODULE_ID_SAP,
+						CDF_TRACE_LEVEL_ERROR,
+						FL("memory allocation failed for sme_config"));
+					return CDF_STATUS_E_NOMEM;
+				}
+				sme_get_config_param(pMac, sme_config);
+				sme_config->csrConfig.channelBondingMode24GHz =
+					eCSR_INI_SINGLE_CHANNEL_CENTERED;
+				sme_update_config(pMac, sme_config);
+				cdf_mem_free(sme_config);
+			}
+
 			/*
 			 * Copy the requested target channel
 			 * to sap context.