[202205][chassis][voq] 400g to100g speed changes for chassis linecards #14024
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Signed-off-by: Arvindsrinivasan Lakshmi Narasimhan <[email protected]>
judyjoseph
approved these changes
Feb 28, 2023
abdosi
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Feb 28, 2023
yxieca
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Feb 28, 2023
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port of #13935 to 202205 branch
Why I did it
On SONiC VoQ chassis, the speed changes are done from 400G to 100G needs to be supported on 400G linecards.
To enable this, along with speed change the port lanes need to be changed. This PR has the changes to update the port lanes when such speed change happens.
This PR is intended only for VoQ chassis linecards. These platforms today have 400g port with 8 serdes lines, and 100g will operate with 4 serdes lane. When the port speed changes from 400G to 100G the first 4 lanes will be used for 100G port.
Platforms which support 2x50g PAM4 or support 100G PAM4 serdes or other combinations are not handled in the PR.
How I did it
Updated the port lanes when the port speed is changed from 400g to 100g.
How to verify it
UT and test on sonic chassis
Which release branch to backport (provide reason below if selected)
Description for the changelog
Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)