qcacmn: Rx Sw Descriptor allocation should be configurable

To make Rx Software descriptor allocation configurable for each radio,
new ini variable is added.

Change-Id: Ifc5683629747a6fe8238c18448695abe91876ec5

wlan_cfg/cfg_dp.h

@@ -277,6 +277,36 @@
 #define WLAN_CFG_RXDMA_ERR_DST_RING_SIZE_MIN 1024
 #define WLAN_CFG_RXDMA_ERR_DST_RING_SIZE_MAX 8192
 
+/**
+ * Allocate as many RX descriptors as buffers in the SW2RXDMA
+ * ring. This value may need to be tuned later.
+ */
+#if defined(QCA_HOST2FW_RXBUF_RING)
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE 1
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MIN 1
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MAX 1
+
+/**
+ * For low memory AP cases using 1 will reduce the rx descriptors memory req
+ */
+#elif defined(QCA_LOWMEM_CONFIG) || defined(QCA_512M_CONFIG)
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE 1
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MIN 1
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MAX 3
+
+/**
+ * AP use cases need to allocate more RX Descriptors than the number of
+ * entries avaialable in the SW2RXDMA buffer replenish ring. This is to account
+ * for frames sitting in REO queues, HW-HW DMA rings etc. Hence using a
+ * multiplication factor of 3, to allocate three times as many RX descriptors
+ * as RX buffers.
+ */
+#else
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE 3
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MIN 1
+#define WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MAX 3
+#endif //QCA_HOST2FW_RXBUF_RING
+
 /* DP INI Declerations */
 #define CFG_DP_HTT_PACKET_TYPE \
 		CFG_INI_UINT("dp_htt_packet_type", \
@@ -683,6 +713,13 @@
 		CFG_INI_BOOL("gEnableDataStallDetection", \
 		true, "Enable/Disable Data stall detection")
 
+#define CFG_DP_RX_SW_DESC_WEIGHT \
+		CFG_INI_UINT("dp_rx_sw_desc_weight", \
+		WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MIN, \
+		WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE_MAX, \
+		WLAN_CFG_RX_SW_DESC_WEIGHT_SIZE, \
+		CFG_VALUE_OR_DEFAULT, "DP RX SW DESC weight")
+
 #define CFG_DP \
 		CFG(CFG_DP_HTT_PACKET_TYPE) \
 		CFG(CFG_DP_INT_BATCH_THRESHOLD_OTHER) \
@@ -747,6 +784,8 @@
 		CFG(CFG_DP_IPA_UC_RX_IND_RING_COUNT) \
 		CFG(CFG_DP_REORDER_OFFLOAD_SUPPORT) \
 		CFG(CFG_DP_AP_STA_SECURITY_SEPERATION) \
-		CFG(CFG_DP_ENABLE_DATA_STALL_DETECTION)
+		CFG(CFG_DP_ENABLE_DATA_STALL_DETECTION) \
+		CFG(CFG_DP_RX_SW_DESC_WEIGHT)
+
 
 #endif /* _CFG_DP_H_ */

wlan_cfg/wlan_cfg.c

@@ -420,7 +420,8 @@ wlan_cfg_soc_attach(struct cdp_ctrl_objmgr_psoc *psoc)
 		cfg_get(psoc, CFG_DP_TX_FLOW_STOP_QUEUE_TH);
 	wlan_cfg_ctx->disable_intra_bss_fwd =
 		cfg_get(psoc, CFG_DP_AP_STA_SECURITY_SEPERATION);
-
+	wlan_cfg_ctx->rx_sw_desc_weight = cfg_get(psoc,
+						   CFG_DP_RX_SW_DESC_WEIGHT);
 	return wlan_cfg_ctx;
 }
 
@@ -978,6 +979,12 @@ wlan_cfg_get_dp_soc_rxdma_err_dst_ring_size(struct wlan_cfg_dp_soc_ctxt *cfg)
 	return cfg->rxdma_err_dst_ring;
 }
 
+int
+wlan_cfg_get_dp_soc_rx_sw_desc_weight(struct wlan_cfg_dp_soc_ctxt *cfg)
+{
+	return cfg->rx_sw_desc_weight;
+}
+
 bool
 wlan_cfg_get_dp_caps(struct wlan_cfg_dp_soc_ctxt *cfg,
 		     enum cdp_capabilities dp_caps)

wlan_cfg/wlan_cfg.h

@@ -159,6 +159,7 @@ struct wlan_srng_cfg {
  *                            dp_rx_process loop
  * tx_comp_enable_eol_data_check: flag to enable/disable checking for more data
  *                                at end of tx_comp_handler loop.
+ * @rx_sw_desc_weight: rx sw descriptor weight configuration
  */
 struct wlan_cfg_dp_soc_ctxt {
 	int num_int_ctxts;
@@ -245,6 +246,7 @@ struct wlan_cfg_dp_soc_ctxt {
 	bool rx_enable_eol_data_check;
 	bool tx_comp_enable_eol_data_check;
 #endif /* WLAN_FEATURE_RX_SOFTIRQ_TIME_LIMIT */
+	int rx_sw_desc_weight;
 };
 
 /**
@@ -1064,6 +1066,15 @@ wlan_cfg_get_dp_soc_rxdma_refill_ring_size(struct wlan_cfg_dp_soc_ctxt *cfg);
 int
 wlan_cfg_get_dp_soc_rxdma_err_dst_ring_size(struct wlan_cfg_dp_soc_ctxt *cfg);
 
+/*
+ * wlan_cfg_get_dp_soc_rx_sw_desc_weight - Get rx sw desc weight
+ * @wlan_cfg_soc_ctx
+ *
+ * Return: rx_sw_desc_weight
+ */
+int
+wlan_cfg_get_dp_soc_rx_sw_desc_weight(struct wlan_cfg_dp_soc_ctxt *cfg);
+
 /*
  * wlan_cfg_get_dp_caps - Get dp capablities
  * @wlan_cfg_soc_ctx