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patch for issue sonic-net#1971 - enable Rx Drop handling for cisco-80…
…00 (sonic-net#2041) What I did Enables support for Rx traffic drop for a port/tc by applying the zero buffer profile Changed class hierarchy so that default getHwCounters() function is used (since the Rx counter support is enabled) Fixes a pfc-wd off by 1 detection in case of PFC-WD detection without traffic Why I did it enabling a missing functionality leveraging sonic code as our sdk now implements the missing counter fixes a bug How I verified it on a cisco-8000 router: detected pfc-wd detection and restore happens within the (detection/restore-time + 1 poll interval) duration and that the changeset passes MSFT tests Verified that when PFC-WD is detected, both Rx and Tx traffic for a port/tc is dropped and no forwarding happens Details if related this patch will need to be double committed to the 202012 branch along with sonic-net#1942 , sonic-net#1748 and sonic-net#1962 Signed-off-by: Alpesh S Patel <alpesh@cisco.com>
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