Add Support for Arista CMIS Enhanced LPO Debug Registers

[mzwang-arista]

Add Support for Arista CMIS Enhanced LPO Debug Registers

Description

This PR adds a eeprom map and implements a child of CmisAPI - CmisEnhancedLpoApi.

The following fields are read from the transceiver and populated into Redis:

1. TRANSCEIVER_INFO|EthernetX

   • LPOTxPolarityInverted
   • LPORxPolarityInverted
   • LPOTxHostInputVMAMonAccuracySupported
   • LPORxInputOMAMonAccuracySupported
   • LPOTxOuterExtinctionRatioMax

2. TRANSCEIVER_DOM_SENSOR|EthernetX

   • LPOHostInputVMATx[1-8]
   • LPOInputOMARx[1-8]

3. TRANSCEIVER_DOM_THRESHOLD|EthernetX

   • LPOTxHostInputVMAHighAlarmThreshold
   • LPOTxHostInputVMALowAlarmThreshold
   • LPOTxHostInputVMAHighWarningThreshold
   • LPOTxHostInputVMALowWarningThreshold
   • LPORxInputOMAHighAlarmThreshold
   • LPORxInputOMALowAlarmThreshold
   • LPORxInputOMAHighWarningThreshold
   • LPORxInputOMALowWarningThreshold

4. TRANSCEIVER_DOM_FLAG|EthernetX
   TRANSCEIVER_DOM_FLAG_SET_TIME|EthernetX
   TRANSCEIVER_DOM_FLAG_CLEAR_TIME|EthernetX
   TRANSCEIVER_DOM_FLAG_CHANGE_COUNT|EthernetX

   • LPOTxHostInputVMAHighAlarmFlag
   • LPOTxHostInputVMALowAlarmFlag
   • LPOTxHostInputVMAHighWarningFlag
   • LPOTxHostInputVMALowWarningFlag
   • LPORxInputOMAHighAlarmFlag
   • LPORxInputOMALowAlarmFlag
   • LPORxInputOMAHighWarningFlag
   • LPORxInputOMALowWarningFlag

Please see HLD for more details (https://github.com/sonic-net/SONiC/blob/master/doc/cmis-lpo-enhancement/cmis-lpo-enhancement.md)

Motivation and Context

The additional enhanced LPO registers provided additional debug information for LPO modules

How Has This Been Tested?

1. A unit test is added. At a high level, the following are tested

• get_transceiver_info
• get_transceiver_dom_real_value
• get_transceiver_threshold_info
• get_transceiver_dom_flags
• Memory map field offsets and sizes
• XcvrApiFactory dispatch to CmisEnhancedLpoApi

2. Tested in the lab with Arista LPO-800G-2DR4. Verified all fields are populated correctly

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).