network/teql: wait for corresponding teql interface to be available

src/network/tc/teql.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include "macro.h"
+#include "networkd-link.h"
 #include "parse-util.h"
 #include "string-util.h"
 #include "teql.h"
@@ -17,9 +18,24 @@ static int trivial_link_equalizer_verify(QDisc *qdisc) {
         return free_and_replace(qdisc->tca_kind, tca_kind);
 }
 
+static int trivial_link_equalizer_is_ready(QDisc *qdisc, Link *link) {
+        Link *teql;
+
+        assert(qdisc);
+        assert(qdisc->tca_kind);
+        assert(link);
+        assert(link->manager);
+
+        if (link_get_by_name(link->manager, qdisc->tca_kind, &teql) < 0)
+                return false;
+
+        return link_is_ready_to_configure(teql, /* allow_unmanaged = */ true);
+}
+
 const QDiscVTable teql_vtable = {
         .object_size = sizeof(TrivialLinkEqualizer),
         .verify = trivial_link_equalizer_verify,
+        .is_ready = trivial_link_equalizer_is_ready,
 };
 
 int config_parse_trivial_link_equalizer_id(