qcacld-3.0: Keep using 4 RX threads for platform with no IPA

For platforms that don't have IPA module, 4 RX rings can be
enabled to map to 4 RX threads. This Change is to implement a
feature flag to separate the number of threads used for
different platforms.

Change-Id: I23744ca6333f29667b0860f386dc9fc45f29abe4
CRs-Fixed: 3018613

Kbuild

@@ -4027,6 +4027,7 @@ cppflags-$(CONFIG_GENERIC_SHADOW_REGISTER_ACCESS_ENABLE) += -DGENERIC_SHADOW_REG
 cppflags-$(CONFIG_IPA_SET_RESET_TX_DB_PA) += -DIPA_SET_RESET_TX_DB_PA
 cppflags-$(CONFIG_DEVICE_FORCE_WAKE_ENABLE) += -DDEVICE_FORCE_WAKE_ENABLE
 cppflags-$(CONFIG_DUMP_REO_QUEUE_INFO_IN_DDR) += -DDUMP_REO_QUEUE_INFO_IN_DDR
+cppflags-$(CONFIG_WLAN_FEATURE_REDUCE_RX_THREADS) += -DWLAN_FEATURE_REDUCE_RX_THREADS
 
 ifdef CONFIG_MAX_CLIENTS_ALLOWED
 ccflags-y += -DWLAN_MAX_CLIENTS_ALLOWED=$(CONFIG_MAX_CLIENTS_ALLOWED)

configs/default_defconfig

@@ -104,6 +104,7 @@ ifeq ($(CONFIG_CNSS_WCN7850), y)
 	CONFIG_DP_FEATURE_HW_COOKIE_CONVERSION := y
 	CONFIG_DP_HW_COOKIE_CONVERT_EXCEPTION := y
 	CONFIG_WLAN_FEATURE_NEAR_FULL_IRQ := y
+	CONFIG_WLAN_FEATURE_REDUCE_RX_THREADS := y
 endif
 
 ifeq (y,$(findstring y,$(CONFIG_LITHIUM) $(CONFIG_BERYLLIUM)))

core/dp/txrx3.0/dp_rx_thread.h

@@ -27,12 +27,14 @@
 /* Maximum number of REO rings supported (for stats tracking) */
 #ifdef CONFIG_BERYLLIUM
 #define DP_RX_TM_MAX_REO_RINGS 8
+/* Number of DP RX threads supported */
+#define DP_MAX_RX_THREADS 3
 #else
 #define DP_RX_TM_MAX_REO_RINGS 4
+#define DP_MAX_RX_THREADS DP_RX_TM_MAX_REO_RINGS
 #endif
 
-/* Number of DP RX threads supported */
-#define DP_MAX_RX_THREADS 3
+#define DP_REDUCED_NUM_RX_THREADS 3
 
 /*
  * struct dp_rx_tm_handle_cmn - Opaque handle for rx_threads to store

core/dp/txrx3.0/dp_txrx.c

@@ -56,6 +56,24 @@ static void dp_rx_refill_thread_schedule(ol_txrx_soc_handle soc)
 }
 #endif
 
+/**
+ * dp_get_rx_threads_num() - Get number of threads in use
+ * @soc: ol_txrx_soc_handle object
+ *
+ * Return: number of threads
+ */
+#ifdef WLAN_FEATURE_REDUCE_RX_THREADS
+static uint8_t dp_get_rx_threads_num(ol_txrx_soc_handle soc)
+{
+	return DP_REDUCED_NUM_RX_THREADS;
+}
+#else
+static uint8_t dp_get_rx_threads_num(ol_txrx_soc_handle soc)
+{
+	return cdp_get_num_rx_contexts(soc);
+}
+#endif
+
 QDF_STATUS dp_txrx_init(ol_txrx_soc_handle soc, uint8_t pdev_id,
 			struct dp_txrx_config *config)
 {
@@ -106,8 +124,8 @@ QDF_STATUS dp_txrx_init(ol_txrx_soc_handle soc, uint8_t pdev_id,
 						dp_rx_refill_thread_schedule);
 	}
 
-	/* Get num Rx thread config from INI? */
-	num_dp_rx_threads = 3;
+	num_dp_rx_threads = dp_get_rx_threads_num(soc);
+	dp_info("%d RX threads in use", num_dp_rx_threads);
 
 	if (dp_ext_hdl->config.enable_rx_threads) {
 		qdf_status = dp_rx_tm_init(&dp_ext_hdl->rx_tm_hdl,