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Index: linux-5.4.77/net/dsa/tag_trailer.c
===================================================================
--- linux-5.4.77.orig/net/dsa/tag_trailer.c
+++ linux-5.4.77/net/dsa/tag_trailer.c
@@ -44,7 +44,12 @@ static struct sk_buff *trailer_xmit(stru
trailer = skb_put(nskb, 4);
trailer[0] = 0x80;
+
+#ifdef CONFIG_NET_DSA_RTL83XX
+ trailer[1] = dp->index;
+#else
trailer[1] = 1 << dp->index;
+#endif /* CONFIG_NET_DSA_RTL83XX */
trailer[2] = 0x10;
trailer[3] = 0x00;
@@ -61,12 +66,20 @@ static struct sk_buff *trailer_rcv(struc
return NULL;
trailer = skb_tail_pointer(skb) - 4;
+
+#ifdef CONFIG_NET_DSA_RTL83XX
+ if (trailer[0] != 0x80 || (trailer[1] & 0xe0) != 0x00 ||
+ (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
+ return NULL;
+
+ source_port = trailer[1] & 0x1f;
+#else
if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
(trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
return NULL;
source_port = trailer[1] & 7;
-
+#endif
skb->dev = dsa_master_find_slave(dev, 0, source_port);
if (!skb->dev)
return NULL;
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