[swss]: IcmpOrch to support ICMP session offload to NPU #3535
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Signed-off-by: Manas Kumar Mandal <manamand@cisco.com>
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What I did
IcmpOrch for supporting hardware offloaded ICMP echo sessions.
Changes done here adds support for the SAI ICMP ECHO spec:
https://github.com/opencomputeproject/SAI/blob/master/doc/SAI-Proposal-ICMP-ECHO.md
Why I did it
ICMP echo sessions are used by LinkMgrd to monitor link state in Dual-ToR architecture and switch traffic.
Current software based ICMP echo sessions used by Linkprober in LinkMgrd limits the detection time and uses host network bandwidth.
Hardware based sessions will bring down the detection time and host network bandwidth is not used.
How I verified it
Tested the changes with DVS.
Details if related
ICMP echo table definitions: sonic-net/sonic-swss-common#980