--- zzzz-none-000/linux-4.1.52/drivers/net/ppp/pppoe.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/drivers/net/ppp/pppoe.c	2022-03-02 11:37:13.000000000 +0000
@@ -497,7 +497,11 @@
 		goto abort;
 
 	ph = pppoe_hdr(skb);
+#if defined(CONFIG_BCM_KF_PPP)
+	if ((ph->code != PADT_CODE) || (ph->sid))
+#else
 	if (ph->code != PADT_CODE)
+#endif /* CONFIG_BCM_KF_PPP */
 		goto abort;
 
 	pn = pppoe_pernet(dev_net(dev));