Update ENCAP_U1 functionality by u1_* headers emission and u1_ipv4 checksum #683
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…ecksum update - Added emission of all u1_* headers in dash_deparser so U1 encapsulation is serialized into the outgoing packet. - Added IPv4 checksum update for hdr.u1_ipv4 alongside hdr.u0_ipv4. - Restored and fixed saidashflow-FlowHitActionEncapU0EncapU1 test to validate double encapsulation packet formation. ENCAP_U1 logic was missing components (header emission and checksum) prevented correct packet output. This change updates the ENCAP_U1 functionality and also updates the test coverage. Signed-off-by: Farhan Tariq <[email protected]>
The committers listed above are authorized under a signed CLA. |
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/azp run |
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Commenter does not have sufficient privileges for PR 683 in repo sonic-net/DASH |
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hi @marian-pritsak and/or @oleksandrivantsiv - would you be able to review this one by chance please? |
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hi @marian-pritsak - would you be able to do a review for @prsunny for this one pls? |
marian-pritsak
approved these changes
Nov 18, 2025
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Summary
This PR updates the ENCAP_U1 functionality in the DASH pipeline by adding the missing deparser emission for u1_* headers and IPv4 checksum update for u1_ipv4.
These updates were made while fixing the saidashflow test case for double encapsulation (ENCAP_U0 | ENCAP_U1), which was failing due to incomplete U1 packet output.
Background
The pipeline’s logic for ENCAP_U1 already existed, but packets generated for ENCAP_U0 | ENCAP_U1 flows were missing the U1 encapsulation layer because:
As a result, the FlowHitActionEncapU0EncapU1 test failed and was disabled.