qcacmn: Add qdf_nbuf_fast_xmit() API

Some platforms support a skb_recycler feature which patches the Linux
kernel to add a bool fast_xmit member to struct sk_buff.
Add a QDF abstraction to return the value of this member when it is
supported, and return false when it is not supported.

Change-Id: I6dfe6276779218f4d0245ec44035b4aa596d0e2a
CRs-Fixed: 3418516

qdf/inc/qdf_nbuf.h

@@ -5590,4 +5590,14 @@ void qdf_nbuf_stop_replenish_timer(void);
  */
 qdf_nbuf_t qdf_get_nbuf_valid_frag(qdf_nbuf_t nbuf);
 
+/**
+ * qdf_nbuf_fast_xmit() - Check if packet has fast_xmit support
+ * @nbuf: qdf_nbuf_t master nbuf
+ *
+ * This function checks if skb has fast_xmit or not.
+ *
+ * Return: True if skb support fast_xmit otherwise false
+ */
+bool qdf_nbuf_fast_xmit(qdf_nbuf_t nbuf);
+
 #endif /* _QDF_NBUF_H */

qdf/linux/src/qdf_nbuf.c

@@ -2664,6 +2664,19 @@ bool __qdf_nbuf_is_ipv4_v6_pure_tcp_ack(struct sk_buff *skb)
 	return is_tcp_ack;
 }
 
+#ifdef QCA_DP_NBUF_FAST_RECYCLE_CHECK
+bool qdf_nbuf_fast_xmit(qdf_nbuf_t nbuf)
+{
+	return nbuf->fast_xmit;
+}
+#else
+bool qdf_nbuf_fast_xmit(qdf_nbuf_t nbuf)
+{
+	return false;
+}
+#endif
+qdf_export_symbol(qdf_nbuf_fast_xmit);
+
 #ifdef NBUF_MEMORY_DEBUG
 
 static spinlock_t g_qdf_net_buf_track_lock[QDF_NET_BUF_TRACK_MAX_SIZE];