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network: TC introduce GRED, Generic Random Early Detection

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http://tldp.org/en/Traffic-Control-HOWTO/ar01s06.html
This commit is contained in:
Susant Sahani 2020-02-10 13:24:02 +01:00 committed by Yu Watanabe
parent bc0769c9f7
commit 609e8340bb
11 changed files with 285 additions and 0 deletions
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47
man/systemd.network.xml
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@ -2600,6 +2600,53 @@
</variablelist>
</refsect1>
<refsect1>
<title>[GenericRandomEarlyDetection] Section Options</title>
<para>The <literal>[GenericRandomEarlyDetection]</literal> section manages the queueing discipline
(qdisc) of Generic Random Early Detection (GRED).</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>VirtualQueues=</varname></term>
<listitem>
<para>Specifies the number of virtual queues. Takes a integer in the range 1-16. Defaults to unset and kernel's default is used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>DefaultVirtualQueue=</varname></term>
<listitem>
<para>Specifies the number of default virtual queue. This must be less than <varname>VirtualQueue=</varname>.
Defaults to unset and kernel's default is used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>GenericRIO=</varname></term>
<listitem>
<para>Takes a boolean. It turns on the RIO-like buffering scheme. Defaults to
unset and kernel's default is used.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>[FairQueueingControlledDelay] Section Options</title>
<para>The <literal>[FairQueueingControlledDelay]</literal> section manages the queueing discipline

7
src/libsystemd/sd-netlink/netlink-types.c
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@ -780,6 +780,10 @@ static const NLType rtnl_tca_option_data_fq_codel_types[] = {
[TCA_FQ_CODEL_MEMORY_LIMIT] = { .type = NETLINK_TYPE_U32 },
};
static const NLType rtnl_tca_option_data_gred_types[] = {
[TCA_GRED_DPS] = { .size = sizeof(struct tc_gred_sopt) },
};
static const NLType rtnl_tca_option_data_htb_types[] = {
[TCA_HTB_PARMS] = { .size = sizeof(struct tc_htb_opt) },
[TCA_HTB_INIT] = { .size = sizeof(struct tc_htb_glob) },
@ -803,6 +807,7 @@ static const char* const nl_union_tca_option_data_table[] = {
[NL_UNION_TCA_OPTION_DATA_CODEL] = "codel",
[NL_UNION_TCA_OPTION_DATA_FQ] = "fq",
[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_TBF] = "tbf",
};
@ -816,6 +821,8 @@ static const NLTypeSystem rtnl_tca_option_data_type_systems[] = {
.types = rtnl_tca_option_data_fq_types },
[NL_UNION_TCA_OPTION_DATA_FQ_CODEL] = { .count = ELEMENTSOF(rtnl_tca_option_data_fq_codel_types),
.types = rtnl_tca_option_data_fq_codel_types },
[NL_UNION_TCA_OPTION_DATA_GRED] = { .count = ELEMENTSOF(rtnl_tca_option_data_gred_types),
.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_TBF] = { .count = ELEMENTSOF(rtnl_tca_option_data_tbf_types),

1
src/libsystemd/sd-netlink/netlink-types.h
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@ -95,6 +95,7 @@ typedef enum NLUnionTCAOptionData {
NL_UNION_TCA_OPTION_DATA_CODEL,
NL_UNION_TCA_OPTION_DATA_FQ,
NL_UNION_TCA_OPTION_DATA_FQ_CODEL,
NL_UNION_TCA_OPTION_DATA_GRED,
NL_UNION_TCA_OPTION_DATA_HTB,
NL_UNION_TCA_OPTION_DATA_TBF,
_NL_UNION_TCA_OPTION_DATA_MAX,

2
src/network/meson.build
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@ -115,6 +115,8 @@ sources = files('''
tc/fq.h
tc/fq-codel.c
tc/fq-codel.h
tc/gred.c
tc/gred.h
tc/htb.c
tc/htb.h
tc/netem.c

5
src/network/networkd-network-gperf.gperf
View File

@ -285,6 +285,11 @@ FairQueueingControlledDelay.TargetSec, config_parse_fair_queueing_controll
FairQueueingControlledDelay.IntervalSec, config_parse_fair_queueing_controlled_delay_usec, QDISC_KIND_FQ_CODEL, 0
FairQueueingControlledDelay.CEThresholdSec, config_parse_fair_queueing_controlled_delay_usec, QDISC_KIND_FQ_CODEL, 0
FairQueueingControlledDelay.ECN, config_parse_fair_queueing_controlled_delay_bool, QDISC_KIND_FQ_CODEL, 0
GenericRandomEarlyDetection.Parent, config_parse_qdisc_parent, QDISC_KIND_GRED, 0
GenericRandomEarlyDetection.Handle, config_parse_qdisc_handle, QDISC_KIND_GRED, 0
GenericRandomEarlyDetection.VirtualQueues, config_parse_generic_random_early_detection_u32, QDISC_KIND_GRED, 0
GenericRandomEarlyDetection.DefaultVirtualQueue, config_parse_generic_random_early_detection_u32, QDISC_KIND_GRED, 0
GenericRandomEarlyDetection.GenericRIO, config_parse_generic_random_early_detection_bool, QDISC_KIND_GRED, 0
HierarchyTokenBucket.Parent, config_parse_qdisc_parent, QDISC_KIND_HTB, 0
HierarchyTokenBucket.Handle, config_parse_qdisc_handle, QDISC_KIND_HTB, 0
HierarchyTokenBucket.DefaultClass, config_parse_hierarchy_token_bucket_default_class, QDISC_KIND_HTB, 0

1
src/network/networkd-network.c
View File

@ -488,6 +488,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
"PFIFO\0"
"FairQueueing\0"
"FairQueueingControlledDelay\0"
"GenericRandomEarlyDetection\0"
"HierarchyTokenBucket\0"
"HierarchyTokenBucketClass\0"
"NetworkEmulator\0"

193
src/network/tc/gred.c Normal file
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@ -0,0 +1,193 @@
/* 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 "string-util.h"
static int generic_random_early_detection_init(QDisc *qdisc) {
GenericRandomEarlyDetection *gred;
assert(qdisc);
gred = GRED(qdisc);
gred->grio = -1;
return 0;
}
static int generic_random_early_detection_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
GenericRandomEarlyDetection *gred;
struct tc_gred_sopt opt = {};
int r;
assert(link);
assert(qdisc);
assert(req);
gred = GRED(qdisc);
opt.DPs = gred->virtual_queues;
opt.def_DP = gred->default_virtual_queue;
if (gred->grio >= 0)
opt.grio = gred->grio;
r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "gred");
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_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
if (r < 0)
return log_link_error_errno(link, r, "Could not append TCA_GRED_DPS 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;
}
static int generic_random_early_detection_verify(QDisc *qdisc) {
GenericRandomEarlyDetection *gred = GRED(qdisc);
if (gred->default_virtual_queue >= gred->virtual_queues)
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: DefaultVirtualQueue= must be less than VirtualQueues=. "
"Ignoring [GenericRandomEarlyDetection] section from line %u.",
qdisc->section->filename, qdisc->section->line);
return 0;
}
int config_parse_generic_random_early_detection_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;
GenericRandomEarlyDetection *gred;
Network *network = data;
uint32_t *p;
uint32_t v;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = qdisc_new_static(QDISC_KIND_GRED, 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");
gred = GRED(qdisc);
if (streq(lvalue, "VirtualQueues"))
p = &gred->virtual_queues;
else if (streq(lvalue, "DefaultVirtualQueue"))
p = &gred->default_virtual_queue;
else
assert_not_reached("Invalid lvalue.");
if (isempty(rvalue)) {
*p = 0;
qdisc = NULL;
return 0;
}
r = safe_atou32(rvalue, &v);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse '%s=', ignoring assignment: %s",
lvalue, rvalue);
return 0;
}
if (v > MAX_DPs) {
log_syntax(unit, LOG_ERR, filename, line, 0,
"Invalid '%s=', ignoring assignment: %s",
lvalue, rvalue);
}
*p = v;
qdisc = NULL;
return 0;
}
int config_parse_generic_random_early_detection_bool(
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;
GenericRandomEarlyDetection *gred;
Network *network = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = qdisc_new_static(QDISC_KIND_GRED, 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");
gred = GRED(qdisc);
if (isempty(rvalue)) {
gred->grio = -1;
qdisc = NULL;
return 0;
}
r = parse_boolean(rvalue);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse '%s=', ignoring assignment: %s",
lvalue, rvalue);
return 0;
}
gred->grio = r;
qdisc = NULL;
return 0;
}
const QDiscVTable gred_vtable = {
.object_size = sizeof(GenericRandomEarlyDetection),
.tca_kind = "gred",
.init = generic_random_early_detection_init,
.fill_message = generic_random_early_detection_fill_message,
.verify = generic_random_early_detection_verify,
};

20
src/network/tc/gred.h Normal file
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@ -0,0 +1,20 @@
/* SPDX-License-Identifier: LGPL-2.1+
* Copyright © 2020 VMware, Inc. */
#pragma once
#include "conf-parser.h"
#include "qdisc.h"
typedef struct GenericRandomEarlyDetection {
QDisc meta;
uint32_t virtual_queues;
uint32_t default_virtual_queue;
int grio;
} GenericRandomEarlyDetection;
DEFINE_QDISC_CAST(GRED, GenericRandomEarlyDetection);
extern const QDiscVTable gred_vtable;
CONFIG_PARSER_PROTOTYPE(config_parse_generic_random_early_detection_u32);
CONFIG_PARSER_PROTOTYPE(config_parse_generic_random_early_detection_bool);

1
src/network/tc/qdisc.c
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@ -19,6 +19,7 @@ const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
[QDISC_KIND_CODEL] = &codel_vtable,
[QDISC_KIND_FQ] = &fq_vtable,
[QDISC_KIND_FQ_CODEL] = &fq_codel_vtable,
[QDISC_KIND_GRED] = &gred_vtable,
[QDISC_KIND_HTB] = &htb_vtable,
[QDISC_KIND_NETEM] = &netem_vtable,
[QDISC_KIND_PFIFO] = &pfifo_vtable,

2
src/network/tc/qdisc.h
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@ -12,6 +12,7 @@ typedef enum QDiscKind {
QDISC_KIND_CODEL,
QDISC_KIND_FQ,
QDISC_KIND_FQ_CODEL,
QDISC_KIND_GRED,
QDISC_KIND_HTB,
QDISC_KIND_NETEM,
QDISC_KIND_PFIFO,
@ -79,6 +80,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_handle);
#include "fifo.h"
#include "fq-codel.h"
#include "fq.h"
#include "gred.h"
#include "htb.h"
#include "netem.h"
#include "sfq.h"

6
test/fuzz/fuzz-network-parser/directives.network
View File

@ -351,3 +351,9 @@ CeilRate=
Parent=
Handle=
PacketLimit=
[GenericRandomEarlyDetection]
Parent=
Handle=
VirtualQueues=
DefaultVirtualQueue=
GenericRIO=