network: Add support for multiq qdisc

man/systemd.network.xml

@@ -6064,6 +6064,16 @@ ServerAddress=192.168.0.1/24</programlisting>
     </variablelist>
   </refsect1>
 
+  <refsect1>
+    <title>[BandMultiQueueing] Section Options</title>
+    <para>The [BandMultiQueueing] section manages the queueing discipline (qdisc) of Band Multi Queueing (multiq).</para>
+
+    <variablelist class='network-directives'>
+      <xi:include href="tc.xml" xpointer="qdisc-parent" />
+      <xi:include href="tc.xml" xpointer="qdisc-handle" />
+    </variablelist>
+  </refsect1>
+
   <refsect1>
     <title>[HeavyHitterFilter] Section Options</title>
     <para>The [HeavyHitterFilter] section manages the queueing discipline (qdisc) of Heavy Hitter Filter

src/network/meson.build

@@ -93,6 +93,7 @@ sources = files(
         'tc/gred.c',
         'tc/hhf.c',
         'tc/htb.c',
+        'tc/multiq.c',
         'tc/netem.c',
         'tc/pie.c',
         'tc/qdisc.c',

src/network/networkd-network-gperf.gperf

@@ -552,6 +552,8 @@ HierarchyTokenBucketClass.Rate,              config_parse_hierarchy_token_bucket
 HierarchyTokenBucketClass.CeilRate,          config_parse_hierarchy_token_bucket_class_rate,           TCLASS_KIND_HTB,               0
 HierarchyTokenBucketClass.BufferBytes,       config_parse_hierarchy_token_bucket_class_size,           TCLASS_KIND_HTB,               0
 HierarchyTokenBucketClass.CeilBufferBytes,   config_parse_hierarchy_token_bucket_class_size,           TCLASS_KIND_HTB,               0
+BandMultiQueueing.Parent,                    config_parse_qdisc_parent,                                QDISC_KIND_MULTIQ,             0
+BandMultiQueueing.Handle,                    config_parse_qdisc_handle,                                QDISC_KIND_MULTIQ,             0
 NetworkEmulator.Parent,                      config_parse_qdisc_parent,                                QDISC_KIND_NETEM,              0
 NetworkEmulator.Handle,                      config_parse_qdisc_handle,                                QDISC_KIND_NETEM,              0
 NetworkEmulator.DelaySec,                    config_parse_network_emulator_delay,                      QDISC_KIND_NETEM,              0

src/network/networkd-network.c

@@ -551,6 +551,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                         "HeavyHitterFilter\0"
                         "HierarchyTokenBucket\0"
                         "HierarchyTokenBucketClass\0"
+                        "BandMultiQueueing\0"
                         "NetworkEmulator\0"
                         "PFIFO\0"
                         "PFIFOFast\0"

src/network/tc/multiq.c

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "multiq.h"
+
+static int multi_queueing_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
+        struct tc_multiq_qopt opt = {};
+
+        assert(req);
+
+        /* It looks weird, but the multiq qdisc initialization wants to receive a tc_multiq_qopt attr even
+         * though it doesn't do anything with it. */
+        return sd_netlink_message_append_data(req, TCA_OPTIONS, &opt, sizeof(opt));
+}
+
+const QDiscVTable multiq_vtable = {
+        .object_size = sizeof(BandMultiQueueing),
+        .tca_kind = "multiq",
+        .fill_message = multi_queueing_fill_message,
+};

src/network/tc/multiq.h

@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "qdisc.h"
+
+typedef struct BandMultiQueueing {
+        QDisc meta;
+} BandMultiQueueing;
+
+DEFINE_QDISC_CAST(MULTIQ, BandMultiQueueing);
+extern const QDiscVTable multiq_vtable;

src/network/tc/qdisc.c

@@ -30,6 +30,7 @@ const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
         [QDISC_KIND_GRED]            = &gred_vtable,
         [QDISC_KIND_HHF]             = &hhf_vtable,
         [QDISC_KIND_HTB]             = &htb_vtable,
+        [QDISC_KIND_MULTIQ]          = &multiq_vtable,
         [QDISC_KIND_NETEM]           = &netem_vtable,
         [QDISC_KIND_PIE]             = &pie_vtable,
         [QDISC_KIND_QFQ]             = &qfq_vtable,

src/network/tc/qdisc.h

@@ -21,6 +21,7 @@ typedef enum QDiscKind {
         QDISC_KIND_GRED,
         QDISC_KIND_HHF,
         QDISC_KIND_HTB,
+        QDISC_KIND_MULTIQ,
         QDISC_KIND_NETEM,
         QDISC_KIND_PFIFO,
         QDISC_KIND_PFIFO_FAST,
@@ -106,6 +107,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_handle);
 #include "gred.h"
 #include "hhf.h"
 #include "htb.h"
+#include "multiq.h"
 #include "pie.h"
 #include "qfq.h"
 #include "netem.h"

test/test-network/conf/25-qdisc-multiq.network

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Name=testtun99
+Name=testtap99
+
+[Network]
+LinkLocalAddressing=yes
+IPv6AcceptRA=no
+
+[BandMultiQueueing]
+Parent=root
+Handle=0002

test/test-network/systemd-networkd-tests.py

@@ -4648,6 +4648,16 @@ class NetworkdTCTests(unittest.TestCase, Utilities):
         print(output)
         self.assertRegex(output, 'qdisc ingress')
 
+    @expectedFailureIfModuleIsNotAvailable('sch_multiq')
+    def test_qdisc_multiq(self):
+        copy_network_unit('25-tun.netdev', '25-tap.netdev', '25-qdisc-multiq.network')
+        start_networkd()
+        self.wait_online('testtun99:degraded', 'testtap99:degraded')
+
+        output = check_output('tc qdisc show dev testtun99')
+        print(output)
+        self.assertIn('qdisc multiq 2: root', output)
+
     @expectedFailureIfModuleIsNotAvailable('sch_netem')
     def test_qdisc_netem(self):
         copy_network_unit('25-qdisc-netem.network', '12-dummy.netdev',