Index: if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.696
diff -u -p -r1.696 if.c
--- if.c	14 May 2023 01:46:53 -0000	1.696
+++ if.c	19 May 2023 03:50:10 -0000
@@ -3481,3 +3481,19 @@ net_tq(unsigned int ifindex)
 
 	return (sn->sn_taskq);
 }
+
+void
+net_tq_barriers(const char *wmesg)
+{
+	struct task barriers[NET_TASKQ];
+	struct refcnt r = REFCNT_INITIALIZER();
+	int i;
+
+	for (i = 0; i < nitems(barriers); i++) {
+		task_set(&barriers[i], (void (*)(void *))refcnt_rele_wake, &r);
+		refcnt_take(&r);
+		task_add(softnets[i].sn_taskq, &barriers[i]);
+	}
+ 
+	refcnt_finalize(&r, wmesg);
+}
Index: if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.212
diff -u -p -r1.212 if.h
--- if.h	15 May 2023 16:34:56 -0000	1.212
+++ if.h	19 May 2023 03:50:10 -0000
@@ -560,6 +560,7 @@ int	if_congested(void);
 __dead void	unhandled_af(int);
 int	if_setlladdr(struct ifnet *, const uint8_t *);
 struct taskq * net_tq(unsigned int);
+void	net_tq_barriers(const char *);
 
 #endif /* _KERNEL */