--- zzzz-none-000/linux-4.4.271/net/sctp/output.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/sctp/output.c	2023-04-19 10:22:30.000000000 +0000
@@ -362,6 +362,9 @@
 	skb_orphan(skb);
 	skb->sk = sk;
 	skb->destructor = sctp_packet_release_owner;
+#ifdef CONFIG_NET_SCHED
+	skb->tc_index = sk->sk_tc_index;
+#endif
 
 	/*
 	 * The data chunks have already been accounted for in sctp_sendmsg(),