qcacld-3.0: add gro flush when bus change to idle

GRO queue more pkts is enabled in bus vote low, when
bus vote back to idle, these frames may not flushed to
stack, use force flush to reduce latency.

Change-Id: I22b5cf994fe02b7e3156a845ee13a5acbf791b22
CRs-Fixed: 2774662

core/hdd/src/wlan_hdd_main.c

@@ -9596,26 +9596,36 @@ static inline void hdd_pm_qos_update_request(struct hdd_context *hdd_ctx,
 #endif /* CLD_PM_QOS */
 
 /**
- * hdd_low_tput_gro_flush_skip_check() - check GRO flush skip condition
+ * hdd_low_tput_gro_flush_skip_handler() - adjust GRO flush for low tput
  * @hdd_ctx: handle to hdd context
  * @next_vote_level: next bus bandwidth level
  *
  * If bus bandwidth level is PLD_BUS_WIDTH_LOW consistently and hit
  * the bus_low_cnt_threshold, set flag to skip GRO flush.
+ * If bus bandwidth keeps going to PLD_BUS_WIDTH_IDLE, perform a GRO
+ * flush to avoid TCP traffic stall
  *
  * Return: none
  */
-static inline void hdd_low_tput_gro_flush_skip_check(
+static inline void hdd_low_tput_gro_flush_skip_handler(
 			struct hdd_context *hdd_ctx,
 			enum pld_bus_width_type next_vote_level)
 {
 	uint32_t bus_low_cnt_threshold =
 				hdd_ctx->config->bus_low_cnt_threshold;
+	struct hdd_adapter *adapter;
 
 	if (next_vote_level == PLD_BUS_WIDTH_LOW) {
 		if (++hdd_ctx->bus_low_vote_cnt >= bus_low_cnt_threshold)
 			qdf_atomic_set(&hdd_ctx->low_tput_gro_enable, 1);
 	} else {
+		if (qdf_atomic_read(&hdd_ctx->low_tput_gro_enable)) {
+			/* flush pending rx pkts when LOW->IDLE */
+			hdd_debug("flush queued GRO pkts");
+			hdd_for_each_adapter(hdd_ctx, adapter)
+				hdd_rx_flush_packet_cbk(adapter,
+							adapter->vdev_id);
+		}
 		hdd_ctx->bus_low_vote_cnt = 0;
 		qdf_atomic_set(&hdd_ctx->low_tput_gro_enable, 0);
 	}
@@ -9672,7 +9682,7 @@ static void hdd_pld_request_bus_bandwidth(struct hdd_context *hdd_ctx,
 
 	dptrace_high_tput_req =
 			next_vote_level > PLD_BUS_WIDTH_IDLE ? true : false;
-	hdd_low_tput_gro_flush_skip_check(hdd_ctx, next_vote_level);
+	hdd_low_tput_gro_flush_skip_handler(hdd_ctx, next_vote_level);
 
 	if (hdd_ctx->cur_vote_level != next_vote_level) {
 		hdd_debug("BW Vote level %d, tx_packets: %lld, rx_packets: %lld",