network: tc: introduce Quick Fair Queueing (QFQ)

man/systemd.network.xml

@@ -3252,6 +3252,17 @@
     </variablelist>
   </refsect1>
 
+  <refsect1>
+    <title>[QuickFairQueueing] Section Options</title>
+    <para>The <literal>[QuickFairQueueing]</literal> section manages the queueing discipline
+    (qdisc) of Quick Fair Queueing (QFQ).</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>[BridgeVLAN] Section Options</title>
       <para>The <literal>[BridgeVLAN]</literal> section manages the VLAN ID configuration of a bridge port and accepts

src/network/meson.build

@@ -131,6 +131,8 @@ sources = files('''
         tc/pie.h
         tc/qdisc.c
         tc/qdisc.h
+        tc/qfq.c
+        tc/qfq.h
         tc/sfb.c
         tc/sfb.h
         tc/sfq.c

src/network/networkd-network-gperf.gperf

@@ -312,6 +312,8 @@ PFIFOFast.Handle,                            config_parse_qdisc_handle,
 PFIFOHeadDrop.Parent,                        config_parse_qdisc_parent,                                QDISC_KIND_PFIFO_HEAD_DROP,    0
 PFIFOHeadDrop.Handle,                        config_parse_qdisc_handle,                                QDISC_KIND_PFIFO_HEAD_DROP,    0
 PFIFOHeadDrop.PacketLimit,                   config_parse_pfifo_size,                                  QDISC_KIND_PFIFO_HEAD_DROP,    0
+QuickFairQueueing.Parent,                    config_parse_qdisc_parent,                                QDISC_KIND_QFQ,                0
+QuickFairQueueing.Handle,                    config_parse_qdisc_handle,                                QDISC_KIND_QFQ,                0
 FairQueueing.Parent,                         config_parse_qdisc_parent,                                QDISC_KIND_FQ,                 0
 FairQueueing.Handle,                         config_parse_qdisc_handle,                                QDISC_KIND_FQ,                 0
 FairQueueing.PacketLimit,                    config_parse_fair_queueing_u32,                           QDISC_KIND_FQ,                 0

src/network/networkd-network.c

@@ -508,9 +508,6 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                         "ControlledDelay\0"
                         "DeficitRoundRobinScheduler\0"
                         "DeficitRoundRobinSchedulerClass\0"
-                        "PFIFO\0"
-                        "PFIFOFast\0"
-                        "PFIFOHeadDrop\0"
                         "FairQueueing\0"
                         "FairQueueingControlledDelay\0"
                         "GenericRandomEarlyDetection\0"
@@ -518,7 +515,11 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                         "HierarchyTokenBucket\0"
                         "HierarchyTokenBucketClass\0"
                         "NetworkEmulator\0"
+                        "PFIFO\0"
+                        "PFIFOFast\0"
+                        "PFIFOHeadDrop\0"
                         "PIE\0"
+                        "QuickFairQueueing\0"
                         "StochasticFairBlue\0"
                         "StochasticFairnessQueueing\0"
                         "TokenBucketFilter\0"

src/network/tc/qdisc.c

@@ -27,6 +27,7 @@ const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
         [QDISC_KIND_HTB] = &htb_vtable,
         [QDISC_KIND_NETEM] = &netem_vtable,
         [QDISC_KIND_PIE] = &pie_vtable,
+        [QDISC_KIND_QFQ] = &qfq_vtable,
         [QDISC_KIND_PFIFO] = &pfifo_vtable,
         [QDISC_KIND_PFIFO_FAST] = &pfifo_fast_vtable,
         [QDISC_KIND_PFIFO_HEAD_DROP] = &pfifo_head_drop_vtable,

src/network/tc/qdisc.h

@@ -23,6 +23,7 @@ typedef enum QDiscKind {
         QDISC_KIND_PFIFO_FAST,
         QDISC_KIND_PFIFO_HEAD_DROP,
         QDISC_KIND_PIE,
+        QDISC_KIND_QFQ,
         QDISC_KIND_SFB,
         QDISC_KIND_SFQ,
         QDISC_KIND_TBF,
@@ -93,6 +94,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_handle);
 #include "hhf.h"
 #include "htb.h"
 #include "pie.h"
+#include "qfq.h"
 #include "netem.h"
 #include "drr.h"
 #include "sfb.h"

src/network/tc/qfq.c

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+
+#include "qdisc.h"
+#include "qfq.h"
+
+const QDiscVTable qfq_vtable = {
+        .object_size = sizeof(QuickFairQueueing),
+        .tca_kind = "qfq",
+};

src/network/tc/qfq.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+#pragma once
+
+#include "qdisc.h"
+
+typedef struct QuickFairQueueing {
+        QDisc meta;
+} QuickFairQueueing;
+
+DEFINE_QDISC_CAST(QFQ, QuickFairQueueing);
+extern const QDiscVTable qfq_vtable;

test/fuzz/fuzz-network-parser/directives.network

@@ -411,6 +411,9 @@ PacketLimit=
 Parent=
 Handle=
 PacketLimit=
+[QuickFairQueueing]
+Parent=
+Handle=
 [DeficitRoundRobinScheduler]
 Parent=
 Handle=