qcacmn: Add support to get free descriptor pool size

Add a function in cdp to get free descriptor pool size.

CRs-Fixed: 2984773
Change-Id: Iac5aca801255e5ba5460ea09c88fc4573c1a7055

dp/inc/cdp_txrx_cmn.h

@@ -2652,4 +2652,24 @@ cdp_drain_txrx(ol_txrx_soc_handle soc)
 
 	return soc->ops->cmn_drv_ops->txrx_drain(soc);
 }
+
+/**
+ * cdp_get_free_desc_poolsize() - get free desc pool size
+ * @soc: opaque soc handle
+ */
+static inline int
+cdp_get_free_desc_poolsize(ol_txrx_soc_handle soc)
+{
+	if (!soc || !soc->ops) {
+		dp_cdp_debug("Invalid Instance");
+		QDF_BUG(0);
+		return 0;
+	}
+
+	if (!soc->ops->cmn_drv_ops ||
+	    !soc->ops->cmn_drv_ops->get_free_desc_poolsize)
+		return 0;
+
+	return soc->ops->cmn_drv_ops->get_free_desc_poolsize(soc);
+}
 #endif /* _CDP_TXRX_CMN_H_ */

dp/inc/cdp_txrx_ops.h

@@ -579,6 +579,7 @@ struct cdp_cmn_ops {
 					  ol_osif_peer_handle osif_peer);
 #endif /* QCA_SUPPORT_WDS_EXTENDED */
 	void (*txrx_drain)(ol_txrx_soc_handle soc);
+	int (*get_free_desc_poolsize)(struct cdp_soc_t *soc);
 };
 
 struct cdp_ctrl_ops {