Policer enhancement to support operational visibility and MEF Metering Modes

[AnandhiDhanabalan]

Overview

This proposal enhances the SAI policer specification by introducing capabilities that improve operational transparency and broaden deployment readiness for carrier Ethernet environments.

Key Enhancements

1. Addition of MEF Standard Metering Modes
Introduce support for MEF 10.2 metering algorithms (MEF0 / MEF1), widely adopted in service provider and metro Ethernet networks. This expands SAI policer capabilities to align with established carrier bandwidth profiling models.

2. Improved Hardware Configuration Visibility
Provide a standard mechanism to query the actual CIR / PIR / CBS / PBS values programmed in hardware. This gives operators clear insight into effective policer settings, helping validate SLA targets, understand hardware-applied values, and simplify troubleshooting.

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[AnandhiDhanabalan]

@kcudnik, I'd like to add an alias similar to the one below. However, I get a compilation error because two enum values resolve to the same value.

Is there a way to support enum aliases in this case?

SAI_POLICER_MODE_TR_TCM_V2 = 0x00000003,

/** MEF 10.2 with Coupling Flag = 0 (RFC 4115 compliant) */
SAI_POLICER_MODE_MEF0 = SAI_POLICER_MODE_TR_TCM_V2,

[kcudnik]

why you want to add alias if you have explicit name for that alreay? add "@ignore" to this enum

[AnandhiDhanabalan]

why you want to add alias if you have explicit name for that alreay? add "@ignore" to this enum

Current SAI supports only SAI_POLICER_MODE_TR_TCM (RFC 2698).

SAI_POLICER_MODE_MEF0 and RFC 4115 are functionally equivalent. As mentioned in my original comment, I'd like both enum names to resolve to the same underlying value since they are functionally equivalent but originate from different standards bodies.

Is supporting such enum aliases possible?

[kcudnik]

Is supporting such enum aliases possible?

yes

[AnandhiDhanabalan]

Is supporting such enum aliases possible?

yes

Can I update the PR even if warning/error for same comes when make -c meta is issued ?

[kcudnik]

yes, you can force push