[Broadcom][DNX] SAI does not support SAI_PORT_STAT_IN_DROPPED_PKTS

[ysmanman]

Description

We encountered the issue in recent 202405 testing on DNX. Created the issue to track the following impact/following-up:

• Looked at SONiC source code and portsorch does poll this counters from SAI. According to BRCM, this counter was not supported in old SAI 7.x neither. Given there was no related issue/bug uncovered in 202205 testing, it's not clear if SONiC require to support this counter on DNX.

• The handling of this unsupported counter was changed in new SAI, e.g. 11.x. This change unfortunately breaks the SAI thrift APIs, like sai_thrift_read_port_counters. For example, the SAI thrift API does not return the correct PFC counter. This breaks sonic-mgmt qos tests.

Steps to reproduce the issue:

1. 2. 3.

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[ysmanman]

Add @arlakshm @vmittal-msft @kenneth-arista for viz.

[ysmanman]

FYI, CSP CS00012365714 was created for this issue and BRCM confirmed SAI_PORT_STAT_IN_DROPPED_PKTS is not supported by SAI.

[rlhui]

adding @tjchadaga as well.

[rlhui]

Fix in test.