From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>
Date: Sat, 23 Mar 2024 13:28:56 +0100
Subject: [PATCH] tc: Fix compilation with Linux v6.8-rc1

Linux v6.8-rc1 removed the definitions related to CBQ making tc fail to
build. Add some #ifdefs to handle this missing support.

Forwarded: http://lists.busybox.net/pipermail/busybox/2024-March/090678.html
---
 networking/tc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/networking/tc.c b/networking/tc.c
index 43187f7ee26c..1315b953e39f 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -231,6 +231,13 @@ static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 	return 0;
 }
 #endif
+
+#ifndef TCA_CBQ_MAX
+/*
+ * Linux v6.8-rc1~131^2~60^2^2 removed the uapi definitions for CBQ.
+ * See https://git.kernel.org/linus/33241dca48626
+ */
+#else
 static int cbq_print_opt(struct rtattr *opt)
 {
 	struct rtattr *tb[TCA_CBQ_MAX+1];
@@ -322,6 +329,7 @@ static int cbq_print_opt(struct rtattr *opt)
  done:
 	return 0;
 }
+#endif
 
 static FAST_FUNC int print_qdisc(
 		const struct sockaddr_nl *who UNUSED_PARAM,
@@ -372,8 +380,10 @@ static FAST_FUNC int print_qdisc(
 		int qqq = index_in_strings(_q_, name);
 		if (qqq == 0) { /* pfifo_fast aka prio */
 			prio_print_opt(tb[TCA_OPTIONS]);
+#ifdef TCA_CBQ_MAX
 		} else if (qqq == 1) { /* class based queuing */
 			cbq_print_opt(tb[TCA_OPTIONS]);
+#endif
 		} else {
 			/* don't know how to print options for this qdisc */
 			printf("(options for %s)", name);
@@ -442,9 +452,11 @@ static FAST_FUNC int print_class(
 		int qqq = index_in_strings(_q_, name);
 		if (qqq == 0) { /* pfifo_fast aka prio */
 			/* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
+#ifdef TCA_CBQ_MAX
 		} else if (qqq == 1) { /* class based queuing */
 			/* cbq_print_copt() is identical to cbq_print_opt(). */
 			cbq_print_opt(tb[TCA_OPTIONS]);
+#endif
 		} else {
 			/* don't know how to print options for this class */
 			printf("(options for %s)", name);