network: TC introduce sfb - Stochastic Fair Blue

Please see https://www.systutorials.com/docs/linux/man/8-tc-sfb/

man/systemd.network.xml

@@ -2467,6 +2467,38 @@
     </variablelist>
   </refsect1>
 
+  <refsect1>
+    <title>[StochasticFairBlue] Section Options</title>
+    <para>The <literal>[StochasticFairBlue]</literal> section manages the queueing discipline
+    (qdisc) of stochastic fair blue (sfb).</para>
+
+    <variablelist class='network-directives'>
+      <varlistentry>
+        <term><varname>Parent=</varname></term>
+        <listitem>
+          <para>Specifies the parent Queueing Discipline (qdisc). Takes one of <literal>root</literal>,
+          <literal>clsact</literal> or <literal>ingress</literal>. Defaults to <literal>root</literal>.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>Handle=</varname></term>
+        <listitem>
+          <para>Specifies the major number of unique identifier of the qdisc, known as the handle.
+          Takes a number in hexadecimal ranges 1 to ffff. Defaults to unset.</para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>PacketLimit=</varname></term>
+        <listitem>
+          <para>Specifies the hard limit on the queue size in number of packets. When this limit is reached, incoming packets are
+          dropped. An unsigned integer ranges 0 to 4294967294. Defaults to unset and kernel's default is used.</para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
   <refsect1>
     <title>[StochasticFairnessQueueing] Section Options</title>
     <para>The <literal>[StochasticFairnessQueueing]</literal> section manages the queueing discipline

src/libsystemd/sd-netlink/netlink-types.c

@@ -793,6 +793,10 @@ static const NLType rtnl_tca_option_data_htb_types[] = {
         [TCA_HTB_CEIL64] = { .type = NETLINK_TYPE_U64 },
 };
 
+static const NLType rtnl_tca_option_data_sfb_types[] = {
+        [TCA_SFB_PARMS] = { .size = sizeof(struct tc_sfb_qopt) },
+};
+
 static const NLType rtnl_tca_option_data_tbf_types[] = {
         [TCA_TBF_PARMS]   = { .size = sizeof(struct tc_tbf_qopt) },
         [TCA_TBF_RTAB]    = { .size = TC_RTAB_SIZE },
@@ -809,6 +813,7 @@ static const char* const nl_union_tca_option_data_table[] = {
         [NL_UNION_TCA_OPTION_DATA_FQ_CODEL] = "fq_codel",
         [NL_UNION_TCA_OPTION_DATA_GRED] = "gred",
         [NL_UNION_TCA_OPTION_DATA_HTB] = "htb",
+        [NL_UNION_TCA_OPTION_DATA_SFB] = "sfb",
         [NL_UNION_TCA_OPTION_DATA_TBF] = "tbf",
 };
 
@@ -825,6 +830,8 @@ static const NLTypeSystem rtnl_tca_option_data_type_systems[] = {
                                                    .types = rtnl_tca_option_data_gred_types },
         [NL_UNION_TCA_OPTION_DATA_HTB] =         { .count = ELEMENTSOF(rtnl_tca_option_data_htb_types),
                                                    .types = rtnl_tca_option_data_htb_types },
+        [NL_UNION_TCA_OPTION_DATA_SFB] =         { .count = ELEMENTSOF(rtnl_tca_option_data_sfb_types),
+                                                   .types = rtnl_tca_option_data_sfb_types },
         [NL_UNION_TCA_OPTION_DATA_TBF] =         { .count = ELEMENTSOF(rtnl_tca_option_data_tbf_types),
                                                    .types = rtnl_tca_option_data_tbf_types },
 };

src/libsystemd/sd-netlink/netlink-types.h

@@ -97,6 +97,7 @@ typedef enum NLUnionTCAOptionData {
         NL_UNION_TCA_OPTION_DATA_FQ_CODEL,
         NL_UNION_TCA_OPTION_DATA_GRED,
         NL_UNION_TCA_OPTION_DATA_HTB,
+        NL_UNION_TCA_OPTION_DATA_SFB,
         NL_UNION_TCA_OPTION_DATA_TBF,
         _NL_UNION_TCA_OPTION_DATA_MAX,
         _NL_UNION_TCA_OPTION_DATA_INVALID = -1,

src/network/meson.build

@@ -123,6 +123,8 @@ sources = files('''
         tc/netem.h
         tc/qdisc.c
         tc/qdisc.h
+        tc/sfb.c
+        tc/sfb.h
         tc/sfq.c
         tc/sfq.h
         tc/tbf.c

src/network/networkd-network-gperf.gperf

@@ -305,6 +305,9 @@ NetworkEmulator.DelayJitterSec,              config_parse_network_emulator_delay
 NetworkEmulator.LossRate,                    config_parse_network_emulator_rate,                       QDISC_KIND_NETEM,              0
 NetworkEmulator.DuplicateRate,               config_parse_network_emulator_rate,                       QDISC_KIND_NETEM,              0
 NetworkEmulator.PacketLimit,                 config_parse_network_emulator_packet_limit,               QDISC_KIND_NETEM,              0
+StochasticFairBlue.Parent,                   config_parse_qdisc_parent,                                QDISC_KIND_SFB,                0
+StochasticFairBlue.Handle,                   config_parse_qdisc_handle,                                QDISC_KIND_SFB,                0
+StochasticFairBlue.PacketLimit,              config_parse_stochastic_fair_blue_u32,                    QDISC_KIND_SFB,                0
 StochasticFairnessQueueing.Parent,           config_parse_qdisc_parent,                                QDISC_KIND_SFQ,                0
 StochasticFairnessQueueing.Handle,           config_parse_qdisc_handle,                                QDISC_KIND_SFQ,                0
 StochasticFairnessQueueing.PerturbPeriodSec, config_parse_stochastic_fairness_queueing_perturb_period, QDISC_KIND_SFQ,                0

src/network/networkd-network.c

@@ -492,6 +492,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
                               "HierarchyTokenBucket\0"
                               "HierarchyTokenBucketClass\0"
                               "NetworkEmulator\0"
+                              "StochasticFairBlue\0"
                               "StochasticFairnessQueueing\0"
                               "TokenBucketFilter\0"
                               "TrivialLinkEqualizer\0",

src/network/tc/qdisc.c

@@ -23,6 +23,7 @@ const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
         [QDISC_KIND_HTB] = &htb_vtable,
         [QDISC_KIND_NETEM] = &netem_vtable,
         [QDISC_KIND_PFIFO] = &pfifo_vtable,
+        [QDISC_KIND_SFB] = &sfb_vtable,
         [QDISC_KIND_SFQ] = &sfq_vtable,
         [QDISC_KIND_TBF] = &tbf_vtable,
         [QDISC_KIND_TEQL] = &teql_vtable,

src/network/tc/qdisc.h

@@ -16,6 +16,7 @@ typedef enum QDiscKind {
         QDISC_KIND_HTB,
         QDISC_KIND_NETEM,
         QDISC_KIND_PFIFO,
+        QDISC_KIND_SFB,
         QDISC_KIND_SFQ,
         QDISC_KIND_TBF,
         QDISC_KIND_TEQL,
@@ -83,6 +84,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_handle);
 #include "gred.h"
 #include "htb.h"
 #include "netem.h"
+#include "sfb.h"
 #include "sfq.h"
 #include "tbf.h"
 #include "teql.h"

src/network/tc/sfb.c

@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+
+#include <linux/pkt_sched.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "netlink-util.h"
+#include "parse-util.h"
+#include "qdisc.h"
+#include "sfb.h"
+#include "string-util.h"
+
+static int stochastic_fair_blue_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
+        StochasticFairBlue *sfb;
+        struct tc_sfb_qopt opt = {
+            .rehash_interval = 600*1000,
+            .warmup_time = 60*1000,
+            .penalty_rate = 10,
+            .penalty_burst = 20,
+            .increment = (SFB_MAX_PROB + 1000) / 2000,
+            .decrement = (SFB_MAX_PROB + 10000) / 20000,
+            .max = 25,
+            .bin_size = 20,
+        };
+        int r;
+
+        assert(link);
+        assert(qdisc);
+        assert(req);
+
+        sfb = SFB(qdisc);
+
+        opt.limit = sfb->packet_limit;
+
+        r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "sfb");
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not open container TCA_OPTIONS: %m");
+
+        r = sd_netlink_message_append_data(req, TCA_SFB_PARMS, &opt, sizeof(struct tc_sfb_qopt));
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not append TCA_SFB_PARMS attribute: %m");
+
+        r = sd_netlink_message_close_container(req);
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not close container TCA_OPTIONS: %m");
+
+        return 0;
+}
+
+int config_parse_stochastic_fair_blue_u32(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+        StochasticFairBlue *sfb;
+        Network *network = data;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = qdisc_new_static(QDISC_KIND_SFB, network, filename, section_line, &qdisc);
+        if (r == -ENOMEM)
+                return log_oom();
+        if (r < 0)
+                return log_syntax(unit, LOG_ERR, filename, line, r,
+                                  "More than one kind of queueing discipline, ignoring assignment: %m");
+
+        sfb = SFB(qdisc);
+
+        if (isempty(rvalue)) {
+                sfb->packet_limit = 0;
+
+                qdisc = NULL;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &sfb->packet_limit);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r,
+                           "Failed to parse '%s=', ignoring assignment: %s",
+                           lvalue, rvalue);
+                return 0;
+        }
+
+        qdisc = NULL;
+
+        return 0;
+}
+
+const QDiscVTable sfb_vtable = {
+        .object_size = sizeof(StochasticFairBlue),
+        .tca_kind = "sfb",
+        .fill_message = stochastic_fair_blue_fill_message,
+};

src/network/tc/sfb.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+#pragma once
+
+#include "conf-parser.h"
+#include "qdisc.h"
+
+typedef struct StochasticFairBlue {
+        QDisc meta;
+
+        uint32_t packet_limit;
+} StochasticFairBlue;
+
+DEFINE_QDISC_CAST(SFB, StochasticFairBlue);
+extern const QDiscVTable sfb_vtable;
+
+CONFIG_PARSER_PROTOTYPE(config_parse_stochastic_fair_blue_u32);

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

@@ -357,3 +357,7 @@ Handle=
 VirtualQueues=
 DefaultVirtualQueue=
 GenericRIO=
+[StochasticFairBlue]
+Parent=
+Handle=
+PacketLimit=