qcacmn: Featurization of DP_TX_DESC_POOL_OPTIMIZE

1. In lowmem profiles the number of tx_desc in 4th pool is reduced to
quarter for memory optimizations.
Added new API dp_get_updated_tx_desc which will return the desc value
from INI based on the flag DP_TX_DESC_POOL_OPTIMIZE.

2. Changes to introduce new INI to get reduced desc value for 4th tx
desc pool.

This helps optimize 0.75M per SOC in lowmem profiles.

Change-Id: I033fcaeb843019fb03bb77e0d05a3ebf60fa806a
CRs-Fixed: 3557483

dp/wifi3.0/dp_tx.c

@@ -6300,7 +6300,7 @@ void dp_tx_desc_flush(struct dp_pdev *pdev, struct dp_vdev *vdev,
 {
 	uint8_t i, num_pool;
 	uint32_t j;
-	uint32_t num_desc, page_id, offset;
+	uint32_t num_desc, num_desc_t, page_id, offset;
 	uint16_t num_desc_per_page;
 	struct dp_soc *soc = pdev->soc;
 	struct dp_tx_desc_s *tx_desc = NULL;
@@ -6319,9 +6319,11 @@ void dp_tx_desc_flush(struct dp_pdev *pdev, struct dp_vdev *vdev,
 		if (!tx_desc_pool->desc_pages.cacheable_pages)
 			continue;
 
+		num_desc_t = dp_get_updated_tx_desc(soc->ctrl_psoc, i,
+						    num_desc);
 		num_desc_per_page =
 			tx_desc_pool->desc_pages.num_element_per_page;
-		for (j = 0; j < num_desc; j++) {
+		for (j = 0; j < num_desc_t; j++) {
 			page_id = j / num_desc_per_page;
 			offset = j % num_desc_per_page;
 			tx_desc = dp_tx_desc_find(soc, i, page_id, offset);

dp/wifi3.0/dp_tx.h

@@ -430,6 +430,36 @@ dp_ppeds_tx_desc_free(struct dp_soc *soc, struct dp_tx_desc_s *tx_desc)
 }
 #endif
 
+/**
+ * dp_get_updated_tx_desc() - get updated tx_desc value
+ * @psoc: psoc object
+ * @pool_num: Tx desc pool Id
+ * @current_desc: Current Tx Desc value
+ *
+ * In Lowmem profiles the number of Tx desc in 4th pool is reduced to quarter
+ * for memory optimizations via this flag DP_TX_DESC_POOL_OPTIMIZE
+ *
+ * Return: Updated Tx Desc value
+ */
+#ifdef DP_TX_DESC_POOL_OPTIMIZE
+static inline uint32_t dp_get_updated_tx_desc(struct cdp_ctrl_objmgr_psoc *psoc,
+					      uint8_t pool_num,
+					      uint32_t current_desc)
+{
+	if (pool_num == 3)
+		return cfg_get(psoc, CFG_DP_TX_DESC_POOL_3);
+	else
+		return current_desc;
+}
+#else
+static inline uint32_t dp_get_updated_tx_desc(struct cdp_ctrl_objmgr_psoc *psoc,
+					      uint8_t pool_num,
+					      uint32_t current_desc)
+{
+	return current_desc;
+}
+#endif
+
 #ifdef DP_TX_EXT_DESC_POOL_OPTIMIZE
 /**
  * dp_tx_ext_desc_pool_override() - Override tx ext desc pool Id

dp/wifi3.0/dp_tx_desc.c

@@ -118,16 +118,17 @@ void dp_tx_desc_pool_cleanup(struct dp_soc *soc, qdf_nbuf_t *nbuf_list)
 QDF_STATUS dp_tx_desc_pool_alloc(struct dp_soc *soc, uint8_t pool_id,
 				 uint32_t num_elem)
 {
-	uint32_t desc_size;
+	uint32_t desc_size, num_elem_t;
 	struct dp_tx_desc_pool_s *tx_desc_pool;
 	QDF_STATUS status;
 
+	num_elem_t = dp_get_updated_tx_desc(soc->ctrl_psoc, pool_id, num_elem);
 	desc_size = DP_TX_DESC_SIZE(sizeof(struct dp_tx_desc_s));
 	tx_desc_pool = &((soc)->tx_desc[(pool_id)]);
 	tx_desc_pool->desc_pages.page_size = DP_BLOCKMEM_SIZE;
 	dp_desc_multi_pages_mem_alloc(soc, QDF_DP_TX_DESC_TYPE,
 				      &tx_desc_pool->desc_pages,
-				      desc_size, num_elem,
+				      desc_size, num_elem_t,
 				      0, true);
 
 	if (!tx_desc_pool->desc_pages.num_pages) {
@@ -136,7 +137,7 @@ QDF_STATUS dp_tx_desc_pool_alloc(struct dp_soc *soc, uint8_t pool_id,
 	}
 
 	/* Arch specific TX descriptor allocation */
-	status = soc->arch_ops.dp_tx_desc_pool_alloc(soc, num_elem, pool_id);
+	status = soc->arch_ops.dp_tx_desc_pool_alloc(soc, num_elem_t, pool_id);
 	if (QDF_IS_STATUS_ERROR(status)) {
 		dp_err("failed to allocate arch specific descriptors");
 		return QDF_STATUS_E_NOMEM;
@@ -164,14 +165,15 @@ QDF_STATUS dp_tx_desc_pool_init(struct dp_soc *soc, uint8_t pool_id,
 				uint32_t num_elem)
 {
 	struct dp_tx_desc_pool_s *tx_desc_pool;
-	uint32_t desc_size;
+	uint32_t desc_size, num_elem_t;
 
 	desc_size = DP_TX_DESC_SIZE(sizeof(struct dp_tx_desc_s));
 
+	num_elem_t = dp_get_updated_tx_desc(soc->ctrl_psoc, pool_id, num_elem);
 	tx_desc_pool = &soc->tx_desc[pool_id];
 	if (qdf_mem_multi_page_link(soc->osdev,
 				    &tx_desc_pool->desc_pages,
-				    desc_size, num_elem, true)) {
+				    desc_size, num_elem_t, true)) {
 		dp_err("invalid tx desc allocation -overflow num link");
 		return QDF_STATUS_E_FAULT;
 	}
@@ -180,14 +182,14 @@ QDF_STATUS dp_tx_desc_pool_init(struct dp_soc *soc, uint8_t pool_id,
 		*tx_desc_pool->desc_pages.cacheable_pages;
 	/* Set unique IDs for each Tx descriptor */
 	if (QDF_STATUS_SUCCESS != soc->arch_ops.dp_tx_desc_pool_init(
-						soc, num_elem, pool_id)) {
+						soc, num_elem_t, pool_id)) {
 		dp_err("initialization per target failed");
 		return QDF_STATUS_E_FAULT;
 	}
 
 	tx_desc_pool->elem_size = DP_TX_DESC_SIZE(sizeof(struct dp_tx_desc_s));
 
-	dp_tx_desc_pool_counter_initialize(tx_desc_pool, num_elem);
+	dp_tx_desc_pool_counter_initialize(tx_desc_pool, num_elem_t);
 	TX_DESC_LOCK_CREATE(&tx_desc_pool->lock);
 
 	return QDF_STATUS_SUCCESS;

wlan_cfg/cfg_dp.h

@@ -726,6 +726,13 @@
 		WLAN_CFG_NUM_TX_DESC, \
 		CFG_VALUE_OR_DEFAULT, "DP Tx Descriptors")
 
+#define CFG_DP_TX_DESC_POOL_3 \
+		CFG_INI_UINT("dp_tx_desc_pool_3", \
+		WLAN_CFG_NUM_TX_DESC_MIN, \
+		WLAN_CFG_NUM_TX_DESC_MAX, \
+		WLAN_CFG_NUM_TX_DESC, \
+		CFG_VALUE_OR_DEFAULT, "DP Tx Descriptor of 3rd pool")
+
 #define CFG_DP_TX_SPL_DESC \
 		CFG_INI_UINT("dp_tx_spl_desc", \
 		WLAN_CFG_NUM_TX_SPL_DESC_MIN, \
@@ -2011,6 +2018,7 @@
 		CFG(CFG_DP_NSS_REO_DEST_RINGS) \
 		CFG(CFG_DP_NSS_TCL_DATA_RINGS) \
 		CFG(CFG_DP_TX_DESC) \
+		CFG(CFG_DP_TX_DESC_POOL_3) \
 		CFG(CFG_DP_TX_SPL_DESC) \
 		CFG(CFG_DP_TX_EXT_DESC) \
 		CFG(CFG_DP_TX_EXT_DESC_POOLS) \