qos: T6225: Fix QoS random-detect policy (backport #3400)

[mergify]

Fix default values for random-detect
Remove dsmark qdisc from gred cofig because dsmark was deleted from kernel

Change Summary

Fix getting default values for random detect policy
Remove dsmark qdisc.

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/T6225

Related PR(s)

Component(s) name

qos

Proposed changes

dsmark was removed from the kernel and iproute2
https://patchwork.kernel.org/project/netdevbpf/patch/[email protected]/

Currently we cannot use it, but looks like gred doesn't distribute traffic by virtual queues automatically therefore we lose behavior similar to WRED which we had in the vyos version 1.3

How to test

conf
set qos interface eth0 egress qos-policy-eth0
set qos policy random-detect qos-policy-eth0 bandwidth 5000
commit

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) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_03_fair_queue (__main__.TestQoS.test_03_fair_queue) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_04_fq_codel (__main__.TestQoS.test_04_fq_codel) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_05_limiter (__main__.TestQoS.test_05_limiter) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_06_network_emulator (__main__.TestQoS.test_06_network_emulator) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_07_priority_queue (__main__.TestQoS.test_07_priority_queue) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_08_random_detect (__main__.TestQoS.test_08_random_detect) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_09_rate_control (__main__.TestQoS.test_09_rate_control) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

ok
test_10_round_robin (__main__.TestQoS.test_10_round_robin) ... 
Selected QoS policy "qos-policy-eth0" does not exist!

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

----------------------------------------------------------------------
Ran 13 tests in 44.034s

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

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This is an automatic backport of pull request #3400 done by [Mergify](https://mergify.com).