qcacmn: Reuse Rx Descriptor Pool Array

wifi up/down will cause soc stop and soc
start which will allocate rx desc pool
array memory for each wifi up

This creates memory fragmentation issue
hence reuse Rx descriptor pool array
across wifi up/down and free only nbufs

CRs-Fixed: 2394666
Change-Id: Ic897c733dfba3d8829e2f2f51099cd615b8a7ea2

dp/wifi3.0/dp_rx_desc.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -35,15 +35,17 @@ QDF_STATUS dp_rx_desc_pool_alloc(struct dp_soc *soc, uint32_t pool_id,
 {
 	uint32_t i;
 
-	rx_desc_pool->array =
-			qdf_mem_malloc(pool_size *
-				       sizeof(union dp_rx_desc_list_elem_t));
+	if (!dp_is_soc_reinit(soc)) {
+		rx_desc_pool->array =
+		qdf_mem_malloc(pool_size *
+		sizeof(union dp_rx_desc_list_elem_t));
 
-	if (!(rx_desc_pool->array)) {
-		QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_FATAL,
-			"%s: RX Desc Pool[%d] allocation failed",
-			__func__, pool_id);
-		return QDF_STATUS_E_NOMEM;
+		if (!(rx_desc_pool->array)) {
+			QDF_TRACE(QDF_MODULE_ID_DP, QDF_TRACE_LEVEL_FATAL,
+				  "%s: RX Desc Pool[%d] allocation failed",
+				  __func__, pool_id);
+			return QDF_STATUS_E_NOMEM;
+		}
 	}
 
 	/* Initialize the lock */
@@ -96,6 +98,33 @@ void dp_rx_desc_pool_free(struct dp_soc *soc, uint32_t pool_id,
 	qdf_spinlock_destroy(&rx_desc_pool->lock);
 }
 
+/*
+ * dp_rx_desc_pool_free_nbuf() - free the sw rx desc nbufs called during
+ *			         de-initialization of wifi module.
+ *
+ * @soc: core txrx main context
+ * @pool_id: pool_id which is one of 3 mac_ids
+ * @rx_desc_pool: rx descriptor pool pointer
+ */
+void dp_rx_desc_nbuf_pool_free(struct dp_soc *soc,
+			       struct rx_desc_pool *rx_desc_pool)
+{
+	int i;
+
+	qdf_spin_lock_bh(&rx_desc_pool->lock);
+	for (i = 0; i < rx_desc_pool->pool_size; i++) {
+		if (rx_desc_pool->array[i].rx_desc.in_use) {
+			if (!(rx_desc_pool->array[i].rx_desc.unmapped))
+				qdf_nbuf_unmap_single(soc->osdev,
+					rx_desc_pool->array[i].rx_desc.nbuf,
+					QDF_DMA_BIDIRECTIONAL);
+			qdf_nbuf_free(rx_desc_pool->array[i].rx_desc.nbuf);
+		}
+	}
+	qdf_spin_unlock_bh(&rx_desc_pool->lock);
+	qdf_spinlock_destroy(&rx_desc_pool->lock);
+}
+
 /*
  * dp_rx_get_free_desc_list() - provide a list of descriptors from
  *				the free rx desc pool.