T6802: Fix QoS Policy Round-Robin with Default Configuration

[HollyGurza]

• Resolved unhandled exception occurring with default round-robin policy config.
• Added default filter to ensure proper round-robin policy.

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T6802

Related PR(s)

Component(s) name

Proposed changes

How to test

conf
set qos interface eth1 egress 'test'
set qos policy round-robin test description 'test desc'
commit

and check tc:

vyos@vyos# tc -d qdisc show dev eth1
qdisc drr 1: root refcnt 2 
qdisc sfq 817a: parent 1:1 limit 127p quantum 1514b depth 127 flows 128 divisor 1024 
[edit]
vyos@vyos# tc -d class show dev eth1
class drr 1:1 root leaf 817a: quantum 1514b 
[edit]
vyos@vyos# tc -d filter show dev eth1
filter parent 1: protocol all pref 1 u32 chain 0 
filter parent 1: protocol all pref 1 u32 chain 0 fh 800: ht divisor 1 
filter parent 1: protocol all pref 1 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1 not_in_hw 
  match 00000000/00000000 at 0

Smoketest result

vyos@vyos:~$ python3 /usr/libexec/vyos/tests/smoke/cli/test_qos.py 
test_01_cake (__main__.TestQoS.test_01_cake) ... ok
test_02_drop_tail (__main__.TestQoS.test_02_drop_tail) ... ok
test_03_fair_queue (__main__.TestQoS.test_03_fair_queue) ... ok
test_04_fq_codel (__main__.TestQoS.test_04_fq_codel) ... ok
test_05_limiter (__main__.TestQoS.test_05_limiter) ... ok
test_06_network_emulator (__main__.TestQoS.test_06_network_emulator) ... ok
test_07_priority_queue (__main__.TestQoS.test_07_priority_queue) ... ok
test_08_random_detect (__main__.TestQoS.test_08_random_detect) ... ok
test_09_rate_control (__main__.TestQoS.test_09_rate_control) ... ok
test_10_round_robin (__main__.TestQoS.test_10_round_robin) ... ok
test_11_shaper (__main__.TestQoS.test_11_shaper) ... ok
test_12_shaper_with_red_queue (__main__.TestQoS.test_12_shaper_with_red_queue) ... ok
test_13_shaper_delete_only_rule (__main__.TestQoS.test_13_shaper_delete_only_rule) ... ok
test_14_policy_limiter_marked_traffic (__main__.TestQoS.test_14_policy_limiter_marked_traffic) ... ok
test_15_traffic_match_group (__main__.TestQoS.test_15_traffic_match_group) ... ok
test_16_wrong_traffic_match_group (__main__.TestQoS.test_16_wrong_traffic_match_group) ... ok
test_20_round_robin_policy_default (__main__.TestQoS.test_20_round_robin_policy_default) ... ok

----------------------------------------------------------------------
Ran 17 tests in 80.656s

OK

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

CI integration 👍 passed!

Details

CI logs

• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed