qcacld-3.0: Dynamic antenna switch in TDLS operation

qcacld-2.0 to qcacld-3.0 propagation

Add dynamic antenna mode change capability for TDLS
operation.

CRs-Fixed: 951596
Change-Id: Ie0b141fbebe0bfa8a173503fc0ec375095240237

core/hdd/inc/wlan_hdd_main.h

@@ -1259,6 +1259,8 @@ struct hdd_context_s {
 	int32_t tdls_fw_off_chan_mode;
 	bool enable_tdls_connection_tracker;
 	uint8_t tdls_external_peer_count;
+	bool tdls_nss_switch_in_progress;
+	int32_t tdls_teardown_peers_cnt;
 #endif
 
 	void *hdd_ipa;

core/hdd/inc/wlan_hdd_tdls.h

@@ -669,6 +669,9 @@ void wlan_hdd_tdls_update_rx_pkt_cnt(hdd_adapter_t *adapter,
 int hdd_set_tdls_scan_type(hdd_context_t *hdd_ctx, int val);
 void hdd_tdls_context_init(hdd_context_t *hdd_ctx);
 void hdd_tdls_context_destroy(hdd_context_t *hdd_ctx);
+int wlan_hdd_tdls_antenna_switch(hdd_context_t *hdd_ctx,
+				 hdd_adapter_t *adapter);
+
 #else
 static inline void hdd_tdls_notify_mode_change(hdd_adapter_t *adapter,
 				hdd_context_t *hddctx)
@@ -691,6 +694,12 @@ static inline void wlan_hdd_tdls_update_rx_pkt_cnt(hdd_adapter_t *adapter,
 }
 static inline void hdd_tdls_context_init(hdd_context_t *hdd_ctx) { }
 static inline void hdd_tdls_context_destroy(hdd_context_t *hdd_ctx) { }
+
+static inline int wlan_hdd_tdls_antenna_switch(hdd_context_t *hdd_ctx,
+					       hdd_adapter_t *adapter)
+{
+	return 0;
+}
 #endif /* End of FEATURE_WLAN_TDLS */
 
 #ifdef FEATURE_WLAN_DIAG_SUPPORT

core/hdd/src/wlan_hdd_ioctl.c

@@ -6611,6 +6611,15 @@ static int drv_cmd_set_antenna_mode(hdd_adapter_t *adapter,
 		goto exit;
 	}
 
+	/* Check TDLS status and update antenna mode */
+	if ((QDF_STA_MODE == adapter->device_mode) &&
+	    cds_is_sta_active_connection_exists() &&
+	    (hdd_ctx->connected_peer_count > 0)) {
+		ret = wlan_hdd_tdls_antenna_switch(hdd_ctx, adapter);
+		if (0 != ret)
+			goto exit;
+	}
+
 	params.set_antenna_mode_resp =
 	    (void *)wlan_hdd_soc_set_antenna_mode_cb;
 	hdd_info("Set antenna mode rx chains: %d tx chains: %d",

core/hdd/src/wlan_hdd_tdls.c

@@ -743,6 +743,8 @@ int wlan_hdd_tdls_init(hdd_adapter_t *pAdapter)
 
 	/* initialize TDLS global context */
 	pHddCtx->connected_peer_count = 0;
+	pHddCtx->tdls_nss_switch_in_progress = false;
+	pHddCtx->tdls_teardown_peers_cnt = 0;
 	sme_set_tdls_power_save_prohibited(WLAN_HDD_GET_HAL_CTX(pAdapter),
 					   pAdapter->sessionId, 0);
 
@@ -4068,6 +4070,17 @@ static int __wlan_hdd_cfg80211_tdls_mgmt(struct wiphy *wiphy,
 		return -EINVAL;
 	}
 
+	if (SIR_MAC_TDLS_TEARDOWN == action_code &&
+	    pHddCtx->tdls_nss_switch_in_progress) {
+		mutex_lock(&pHddCtx->tdls_lock);
+		if (pHddCtx->tdls_teardown_peers_cnt != 0)
+			pHddCtx->tdls_teardown_peers_cnt--;
+		if (pHddCtx->tdls_teardown_peers_cnt == 0)
+			pHddCtx->tdls_nss_switch_in_progress = false;
+		mutex_unlock(&pHddCtx->tdls_lock);
+	}
+
+
 	if ((SIR_MAC_TDLS_DIS_REQ == action_code) ||
 	    (SIR_MAC_TDLS_DIS_RSP == action_code)) {
 		/* for DIS_REQ/DIS_RSP, supplicant does not consider the return
@@ -5744,3 +5757,107 @@ int hdd_set_tdls_scan_type(hdd_context_t *hdd_ctx, int val)
 		return 0;
 	}
 }
+
+/**
+ * wlan_hdd_tdls_teardown_links() - teardown tdls links
+ * @hddCtx : pointer to hdd context
+ *
+ * Return: 0 if success else non zero
+ */
+static int wlan_hdd_tdls_teardown_links(hdd_context_t *hddctx)
+{
+	uint16_t connected_tdls_peers = 0;
+	uint8_t staidx;
+	hddTdlsPeer_t *curr_peer;
+	hdd_adapter_t *adapter;
+
+	if (eTDLS_SUPPORT_NOT_ENABLED == hddctx->tdls_mode) {
+		hdd_log(LOG1, "TDLS mode is disabled OR not enabled in FW");
+		return 0;
+	}
+
+	adapter = hdd_get_adapter(hddctx, QDF_STA_MODE);
+
+	if (adapter == NULL) {
+		hdd_log(LOGE, "Station Adapter Not Found");
+		return 0;
+	}
+
+	connected_tdls_peers = wlan_hdd_tdls_connected_peers(adapter);
+
+	if (!connected_tdls_peers)
+		return 0;
+
+	for (staidx = 0; staidx < hddctx->max_num_tdls_sta;
+							staidx++) {
+		if (!hddctx->tdlsConnInfo[staidx].staId)
+			continue;
+
+		curr_peer = wlan_hdd_tdls_find_all_peer(hddctx,
+				hddctx->tdlsConnInfo[staidx].peerMac.bytes);
+
+		if (!curr_peer)
+			continue;
+
+		hdd_log(LOG1, "indicate TDLS teardown (staId %d)",
+			curr_peer->staId);
+
+		wlan_hdd_tdls_indicate_teardown(
+					curr_peer->pHddTdlsCtx->pAdapter,
+					curr_peer,
+					eSIR_MAC_TDLS_TEARDOWN_UNSPEC_REASON);
+		mutex_lock(&hddctx->tdls_lock);
+		hddctx->tdls_teardown_peers_cnt++;
+		mutex_unlock(&hddctx->tdls_lock);
+	}
+	mutex_lock(&hddctx->tdls_lock);
+	if (hddctx->tdls_teardown_peers_cnt >= 1)
+		hddctx->tdls_nss_switch_in_progress = true;
+	hdd_log(LOGE, "TDLS peers to be torn down = %d",
+		hddctx->tdls_teardown_peers_cnt);
+	mutex_unlock(&hddctx->tdls_lock);
+	hdd_log(LOGE, "TDLS teardown for antenna switch operation starts");
+	return -EAGAIN;
+}
+
+/**
+ * wlan_hdd_tdls_antenna_switch() - Dynamic TDLS antenna  switch 1x1 <-> 2x2
+ * antenna mode in standalone station
+ * @hdd_ctx: Pointer to hdd contex
+ * @adapter: Pointer to hdd adapter
+ *
+ * Return: 0 if success else non zero
+ */
+int wlan_hdd_tdls_antenna_switch(hdd_context_t *hdd_ctx,
+				 hdd_adapter_t *adapter)
+{
+	uint8_t tdls_peer_cnt;
+	hdd_station_ctx_t *sta_ctx =
+		WLAN_HDD_GET_STATION_CTX_PTR(adapter);
+
+	/* Check whether TDLS antenna switch is in progress */
+	if (hdd_ctx->tdls_nss_switch_in_progress) {
+		hdd_log(LOGE, "TDLS antenna switch is in progress");
+		return -EAGAIN;
+	}
+
+	/* Check whether TDLS is connected or not */
+	mutex_lock(&hdd_ctx->tdls_lock);
+	tdls_peer_cnt = hdd_ctx->connected_peer_count;
+	mutex_unlock(&hdd_ctx->tdls_lock);
+	if (tdls_peer_cnt <= 0)
+		goto tdls_ant_sw_done;
+
+	/* Check the current operating band */
+	if (!IS_5G_CH(sta_ctx->conn_info.operationChannel)) {
+		hdd_log(LOGE, "TDLS is in 2.4G, Ant switch not needed");
+		return 0;
+	}
+
+	/* teardown all the tdls connections */
+	return wlan_hdd_tdls_teardown_links(hdd_ctx);
+
+tdls_ant_sw_done:
+	hdd_log(LOGE, "No TDLS connection established");
+	return 0;
+}