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Maniphest T5314

QOS Default classes are not configured with correct qdisc
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Description

qos classes of type "default" are not being setup with the configured queuing discipline.

Bug recreation (variation: no classes)

vyos@vyos# set qos policy shaper TEST bandwidth 777mbit
[edit]
vyos@vyos# set qos policy shaper TEST default bandwidth 333mbit
[edit]
vyos@vyos# set qos interface eth1 egress TEST
[edit]
vyos@vyos# commit
DEBUG/QoS: tc qdisc replace dev eth1 root handle 1: htb r2q 485 default 1
DEBUG/QoS: tc class replace dev eth1 parent 1: classid 1:1 htb rate 777000000
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:1 htb rate 333000000 burst 15k quantum 1514 prio 20
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:1 sfq
{'bandwidth': '777mbit',
 'default': {'bandwidth': '333mbit',
             'burst': '15k',
             'codel_quantum': '1514',
             'flows': '1024',
             'interval': '100',
             'priority': '20',
             'queue_type': 'fq-codel',
             'target': '5'}}
[edit]
vyos@vyos# tc qdisc show dev eth1
qdisc htb 1: root refcnt 2 r2q 485 default 0x1 direct_packets_stat 0 direct_qlen 1000
qdisc sfq 8001: parent 1:1 limit 127p quantum 1514b depth 127 divisor 1024
[edit]

Bug recreation (variation: with classes)

vyos@vyos# set qos policy shaper TEST class 42 bandwidth 42mbit
[edit]
vyos@vyos# commit
DEBUG/QoS: tc qdisc replace dev eth1 root handle 1: htb r2q 485 default 2b
DEBUG/QoS: tc class replace dev eth1 parent 1: classid 1:1 htb rate 777000000
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:2a htb rate 42000000 burst 15k quantum 1514
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:2a sfq
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:2b htb rate 333000000 burst 15k quantum 1514 prio 20
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:2b sfq
{'bandwidth': '777mbit',
 'class': {'42': {'bandwidth': '42mbit',
                  'burst': '15k',
                  'codel_quantum': '1514',
                  'flows': '1024',
                  'interval': '100',
                  'queue_type': 'fq-codel',
                  'target': '5'}},
 'default': {'bandwidth': '333mbit',
             'burst': '15k',
             'codel_quantum': '1514',
             'flows': '1024',
             'interval': '100',
             'priority': '20',
             'queue_type': 'fq-codel',
             'target': '5'}}
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:2a fq_codel quantum 1514 flows 1024 interval 100 interval 100 target 5
DEBUG/QoS: tc filter replace dev eth1 parent 1: protocol all basic flowid 1:2a
[edit]
vyos@vyos# tc qdisc show dev eth1
qdisc htb 1: root refcnt 2 r2q 485 default 0x2b direct_packets_stat 0 direct_qlen 1000
qdisc sfq 8003: parent 1:2b limit 127p quantum 1514b depth 127 divisor 1024
qdisc fq_codel 8004: parent 1:2a limit 10240p flows 1024 quantum 1514 target 4us interval 99us memory_limit 32Mb ecn drop_batch 64
[edit]

This variant correctly configures the class '10' but not 'default'

Bug recreation (variation: with part of T5295 reverted + no classes)

#
if 'default' in config:
    if 'class' in config:
        class_id_max = self._get_class_max_id(config)
        default_cls_id = int(class_id_max) +1
        self._build_base_qdisc(config['default'], default_cls_id)
#
vyos@vyos# commit
DEBUG/QoS: tc qdisc replace dev eth1 root handle 1: htb r2q 485 default 1
DEBUG/QoS: tc class replace dev eth1 parent 1: classid 1:1 htb rate 777000000
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:1 htb rate 333000000 burst 15k quantum 1514 prio 20
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:1 sfq
{'bandwidth': '777mbit',
 'default': {'bandwidth': '333mbit',
             'burst': '15k',
             'codel_quantum': '1514',
             'flows': '1024',
             'interval': '100',
             'priority': '20',
             'queue_type': 'fq-codel',
             'target': '5'}}
[edit]
vyos@vyos# tc qdisc show dev eth1
qdisc htb 1: root refcnt 2 r2q 485 default 0x1 direct_packets_stat 0 direct_qlen 1000
qdisc sfq 8001: parent 1:1 limit 127p quantum 1514b depth 127 divisor 1024
[edit]

Expected behavior (needed variation: with part of T5295 reverted + with classes)

vyos@vyos# set qos policy shaper TEST class 88 bandwidth 88mbit
[edit]
vyos@vyos# commit
DEBUG/QoS: tc qdisc replace dev eth1 root handle 1: htb r2q 485 default 59
DEBUG/QoS: tc class replace dev eth1 parent 1: classid 1:1 htb rate 777000000
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:58 htb rate 88000000 burst 15k quantum 1514
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:58 sfq
DEBUG/QoS: tc class replace dev eth1 parent 1:1 classid 1:59 htb rate 333000000 burst 15k quantum 1514 prio 20
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:59 sfq
{'bandwidth': '777mbit',
 'class': {'88': {'bandwidth': '88mbit',
                  'burst': '15k',
                  'codel_quantum': '1514',
                  'flows': '1024',
                  'interval': '100',
                  'queue_type': 'fq-codel',
                  'target': '5'}},
 'default': {'bandwidth': '333mbit',
             'burst': '15k',
             'codel_quantum': '1514',
             'flows': '1024',
             'interval': '100',
             'priority': '20',
             'queue_type': 'fq-codel',
             'target': '5'}}
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:58 fq_codel quantum 1514 flows 1024 interval 100 interval 100 target 5
DEBUG/QoS: tc filter replace dev eth1 parent 1: protocol all basic flowid 1:58
DEBUG/QoS: tc qdisc replace dev eth1 parent 1:59 fq_codel quantum 1514 flows 1024 interval 100 interval 100 target 5
[edit]
vyos@vyos# tc qdisc show dev eth1
qdisc htb 1: root refcnt 2 r2q 485 default 0x59 direct_packets_stat 0 direct_qlen 1000
qdisc fq_codel 8005: parent 1:59 limit 10240p flows 1024 quantum 1514 target 4us interval 99us memory_limit 32Mb ecn drop_batch 64
qdisc fq_codel 8004: parent 1:58 limit 10240p flows 1024 quantum 1514 target 4us interval 99us memory_limit 32Mb ecn drop_batch 64
[edit]

Details

Difficulty level
Easy (less than an hour)
Version
1.4-rolling-202306210317
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Related Objects

Event Timeline

JonSanMan created this task.Jun 25 2023, 3:18 AM
JonSanMan claimed this task.Jun 25 2023, 3:43 AM
JonSanMan triaged this task as Low priority.

PR: https://github.com/vyos/vyos-1x/pull/2054

pasik added a subscriber: pasik.Jun 25 2023, 2:31 PM
daniil added a subscriber: daniil.Jun 26 2023, 9:17 AM
JonSanMan renamed this task from Default qos classes are not configured with correct qdisc to QOS Default classes are not configured with correct qdisc.Jul 5 2023, 2:55 PM
JonSanMan raised the priority of this task from Low to Requires assessment.
JonSanMan added a comment.Jul 5 2023, 3:02 PM

In preparing/testing a revised pull-request to fix a merge conflict, with version 1.4-rolling-202307050317, the testing commands need to be slightly modified.

In order to test basic shaper policies with classes a match rule must be created for the class, otherwise python throws an UnboundLocalError.
It doesn't make sense to have a class without a match in the first place, so some guardrails should be put up to prevent that error, but that's a different issue for a different time.

JonSanMan closed this task as Resolved.Jul 11 2023, 9:03 PM