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DSCP Transparency with ECN #3707

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Jan 23, 2025
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DSCP Transparency with ECN #3707

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103 changes: 55 additions & 48 deletions ...ecn/otg_tests/DSCP_transparency/README.md → ...tg_tests/dscp_transparency_test/README.md
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# DP-1.14: DSCP transperency with ECN
# DP-1.17: DSCP Transparency with ECN

## Summary

Expand Down Expand Up @@ -28,10 +27,10 @@ This test evaluates if all 64 combination of DSCP bits are transparently handled
* 7 queues and 7 corresponding forwarding group
* Scheduler policy with
* one scheduler of STRICT priority type serving NC1 queue
* one scheduler of WRR type serving 6 queues AF4, AF3, AF2, AF1, BE0, BE1 with equal weights 10:10:10:10:10:10 respectivly
* one scheduler of WRR type serving 6 queues AF4, AF3, AF2, AF1, BE0, BE1 with equal weights 10:10:10:10:10:10 respectively
* queue-management profile of WRED type with:
* min-treshold: 80KB
* max-treshold: 3MB
* min-threshold: 80KB
* max-threshold: 3MB
* max-drop-percentage: 100
* ecn: enabled
* attach queue-management profile to queues NC1, AF4, AF3, AF2, AF1, BE0, BE1;
Expand All @@ -48,8 +47,9 @@ This test evaluates if all 64 combination of DSCP bits are transparently handled
* Verify using DUTPort3 telemetry that:
* no drops are seen in any of queues on DUTPort3
* all queues reports non-zero transmit packets, octets.
* Verify on ATEPort3 that all flows are recived w/o DSCP modification -all 64 values are observed
* verify on ATEPort3 that all recived packet has ECT(0) ECN value
* Verify on ATEPort3 that all flows are received w/o DSCP modification -all 64 values are observed
* verify on ATEPort3 that all received packet has ECT(0) ECN value

### Sub Test #2 - Congestion
* Generate 64 flows of traffic form ATEPort1 and 64 flows of traffic form ATEPort2 toward ATEPort3
* each flow form ATEPort1 has distinct DSCP value
Expand All @@ -64,10 +64,11 @@ This test evaluates if all 64 combination of DSCP bits are transparently handled
* Verify using DUTPort3 telemetry that:
* Drops are seen in all queues except NC1 on DUTPort3
* all queues reports non-zero transmit packets, octets.
* Verify on ATEPort3 that all flows are recived w/o DSCP modification - all 64 values are observed
* Verify on ATEPort3 that all flows are received w/o DSCP modification - all 64 values are observed
* verify on ATEPort3 that:
* all recived packets with DSCP 48-63 has ECT(0) value
* all received packets with DSCP 48-63 has ECT(0) value
* vast majority (almost all) packets with DSCP 0-47 has CE ECN value.

### Sub Test #3 - NC1 congestion
* Generate 16 flows of traffic form ATEPort1 and 16 flows of traffic form ATEPort2 toward ATEPort3
* each flow form ATEPort1 has distinct DSCP value from 48-63 range
Expand All @@ -81,47 +82,53 @@ This test evaluates if all 64 combination of DSCP bits are transparently handled
* wait 1 minutes; stop traffic generation.
* Verify using DUTPort3 telemetry that:
* Drops are seen in NC1 queue on DUTPort3
* all queues but NC1 reports nzero transmit packets, octets.
* all queues but NC1 reports zero transmit packets, octets.
* NC1 queue reports non-zero transmit packets, octets.
* Verify on ATEPort3 that all flows are recived w/o DSCP modification - all 16 values are observed.
* Verify on ATEPort3 that all flows are received w/o DSCP modification - all 16 values are observed.
* verify on ATEPort3 that:
* all recived packets with DSCP has CE value

## Config Parameter Coverage

* qos/classifiers/classifier/terms/term/conditions/ipv4/config/dscp-set
* qos/classifiers/classifier/terms/term/conditions/ipv6/config/dscp-set
* qos/classifiers/classifier/terms/term/actions/config/target-group
* qos/queues/queue/config/name
* qos/forwarding-groups/forwarding-group/config/name
* qos/forwarding-groups/forwarding-group/config/output-queue
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/priority
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/sequence
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/id
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/input-type
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/queue
* qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/weight
* qos/queue-management-profiles/queue-management-profile/wred/uniform/config/enable-ecn
* qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-drop-probability-percent
* qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-threshold
* qos/queue-management-profiles/queue-management-profile/wred/uniform/config/min-threshold
* qos/interfaces/interface/output/queues/queue/config/name
* qos/interfaces/interface/output/queues/queue/config/queue-management-profile
* qos/interfaces/interface/output/scheduler-policy/config/name
* qos/interfaces/interface/input/classifiers/classifier/config/name
* qos/interfaces/interface/input/classifiers/classifier/config/type

## Telemetry Parameter Coverage

* qos/interfaces/interface/output/queues/queue/state/dropped-octets
* qos/interfaces/interface/output/queues/queue/state/dropped-pkts
* qos/interfaces/interface/output/queues/queue/state/name
* qos/interfaces/interface/output/queues/queue/state/transmit-octets
* qos/interfaces/interface/output/queues/queue/state/transmit-pkts

## Protocol/RPC Parameter Coverage

* NONE.
* all received packets with DSCP has CE value

## OpenConfig Path and RPC Coverage

The below yaml defines the OC paths intended to be covered by this test. OC paths used for test setup are not listed here.

```yaml
paths:
## Config Paths ##
/qos/classifiers/classifier/terms/term/conditions/ipv4/config/dscp-set:
/qos/classifiers/classifier/terms/term/conditions/ipv6/config/dscp-set:
/qos/classifiers/classifier/terms/term/actions/config/target-group:
/qos/queues/queue/config/name:
/qos/forwarding-groups/forwarding-group/config/name:
/qos/forwarding-groups/forwarding-group/config/output-queue:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/priority:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/config/sequence:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/id:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/input-type:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/queue:
/qos/scheduler-policies/scheduler-policy/schedulers/scheduler/inputs/input/config/weight:
/qos/queue-management-profiles/queue-management-profile/wred/uniform/config/enable-ecn:
/qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-drop-probability-percent:
/qos/queue-management-profiles/queue-management-profile/wred/uniform/config/max-threshold:
/qos/queue-management-profiles/queue-management-profile/wred/uniform/config/min-threshold:
/qos/interfaces/interface/output/queues/queue/config/name:
/qos/interfaces/interface/output/queues/queue/config/queue-management-profile:
/qos/interfaces/interface/output/scheduler-policy/config/name:
/qos/interfaces/interface/input/classifiers/classifier/config/name:
/qos/interfaces/interface/input/classifiers/classifier/config/type:

## State Paths ##
/qos/interfaces/interface/output/queues/queue/state/dropped-octets:
/qos/interfaces/interface/output/queues/queue/state/dropped-pkts:
/qos/interfaces/interface/output/queues/queue/state/name:
/qos/interfaces/interface/output/queues/queue/state/transmit-octets:
/qos/interfaces/interface/output/queues/queue/state/transmit-pkts:

rpcs:
gnmi:
gNMI.Set:
gNMI.Subscribe:
```

## Required DUT platform

Expand Down
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