--- zzzz-none-000/linux-3.10.107/net/l2tp/l2tp_ppp.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/net/l2tp/l2tp_ppp.c	2021-11-10 11:53:56.000000000 +0000
@@ -18,6 +18,12 @@
  *
  */
 
+/**
+ * Some part of this file is modified by Ikanos Communications. 
+ *
+ * Copyright (C) 2013-2014 Ikanos Communications.
+ */
+
 /* This driver handles only L2TP data frames; control frames are handled by a
  * userspace application.
  *
@@ -132,6 +138,13 @@
 
 static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb);
 
+#if IS_ENABLED(CONFIG_FUSIV_KERNEL_AP_2_AP)
+#ifdef CONFIG_L2TP_AP_SUPPORT
+extern void (*buildL2TPFastPathInfo_ptr)(struct sk_buff *skb, struct l2tp_session *session,__u8 direction);
+#endif
+#endif
+
+
 static const struct ppp_channel_ops pppol2tp_chan_ops = {
 	.start_xmit =  pppol2tp_xmit,
 };
@@ -235,6 +248,13 @@
 			 "%s: recv %d byte data frame, passing to ppp\n",
 			 session->name, data_len);
 
+#if IS_ENABLED(CONFIG_FUSIV_KERNEL_AP_2_AP)
+#if IS_ENABLED(CONFIG_L2TP_AP_SUPPORT) && !IS_ENABLED(CONFIG_IPSEC_AP_SUPPORT)
+               if(skb->sp) {
+                  skb->apFlowData.encap_protocol = PROCESS_L2TP_SLOW_PATH;
+               }
+#endif
+#endif
 		/* We need to forget all info related to the L2TP packet
 		 * gathered in the skb as we are going to reuse the same
 		 * skb for the inner packet.
@@ -252,6 +272,21 @@
 		nf_reset(skb);
 
 		po = pppox_sk(sk);
+#if IS_ENABLED(CONFIG_FUSIV_KERNEL_AP_2_AP)
+#ifdef CONFIG_L2TP_AP_SUPPORT
+		//printk("\r\n %s %d \n",__func__,__LINE__);
+		if(buildL2TPFastPathInfo_ptr) {
+                   if (skb->apFlowData.encap_protocol != PROCESS_L2TP_SLOW_PATH) {
+	                buildL2TPFastPathInfo_ptr(skb,session,PROCESS_L2TP_DECAP);
+                   }
+                } else {
+                    skb->apFlowData.encap_protocol = PROCESS_L2TP_SLOW_PATH;
+                }
+#else
+                /* Don't add fast path entry when fast path l2tp disabled */
+		skb->apFlowData.encap_protocol = PROCESS_L2TP_SLOW_PATH;
+#endif
+#endif
 		ppp_input(&po->chan, skb);
 	} else {
 		l2tp_info(session, PPPOL2TP_MSG_DATA, "%s: socket not bound\n",