network: tc: make Parent= take class id

src/network/tc/qdisc.c

@@ -12,6 +12,8 @@
 #include "qdisc.h"
 #include "set.h"
 #include "string-util.h"
+#include "strv.h"
+#include "tc-util.h"
 
 const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
         [QDISC_KIND_CODEL] = &codel_vtable,
@@ -279,19 +281,21 @@ int config_parse_qdisc_parent(
                 qdisc->parent = TC_H_INGRESS;
                 qdisc->handle = TC_H_MAKE(TC_H_INGRESS, 0);
         } else {
-                log_syntax(unit, LOG_ERR, filename, line, r,
-                           "Failed to parse 'Parent=', ignoring assignment: %s",
-                           rvalue);
-                return 0;
+                r = parse_handle(rvalue, &qdisc->parent);
+                if (r < 0) {
+                        log_syntax(unit, LOG_ERR, filename, line, r,
+                                   "Failed to parse 'Parent=', ignoring assignment: %s",
+                                   rvalue);
+                        return 0;
+                }
         }
 
-        if (streq(rvalue, "root"))
-                qdisc->tca_kind = mfree(qdisc->tca_kind);
-        else {
+        if (STR_IN_SET(rvalue, "clsact", "ingress")) {
                 r = free_and_strdup(&qdisc->tca_kind, rvalue);
                 if (r < 0)
                         return log_oom();
-        }
+        } else
+                qdisc->tca_kind = mfree(qdisc->tca_kind);
 
         qdisc = NULL;
 

src/network/tc/tc-util.c

@@ -2,6 +2,7 @@
  * Copyright © 2019 VMware, Inc. */
 
 #include "alloc-util.h"
+#include "extract-word.h"
 #include "fileio.h"
 #include "parse-util.h"
 #include "tc-util.h"
@@ -92,3 +93,32 @@ int tc_fill_ratespec_and_table(struct tc_ratespec *rate, uint32_t *rtab, uint32_
         rate->linklayer = TC_LINKLAYER_ETHERNET;
         return 0;
 }
+
+int parse_handle(const char *t, uint32_t *ret) {
+        _cleanup_free_ char *word = NULL;
+        uint16_t major, minor;
+        int r;
+
+        assert(t);
+        assert(ret);
+
+        /* Extract the major number. */
+        r = extract_first_word(&t, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return -EINVAL;
+        if (!t)
+                return -EINVAL;
+
+        r = safe_atou16_full(word, 16, &major);
+        if (r < 0)
+                return r;
+
+        r = safe_atou16_full(t, 16, &minor);
+        if (r < 0)
+                return r;
+
+        *ret = ((uint32_t) major << 16) | minor;
+        return 0;
+}

src/network/tc/tc-util.h

@@ -10,3 +10,4 @@ int tc_time_to_tick(usec_t t, uint32_t *ret);
 int parse_tc_percent(const char *s, uint32_t *percent);
 int tc_transmit_time(uint64_t rate, uint32_t size, uint32_t *ret);
 int tc_fill_ratespec_and_table(struct tc_ratespec *rate, uint32_t *rtab, uint32_t mtu);
+int parse_handle(const char *t, uint32_t *ret);