[doc][vpp] HLD for Router Interface Loopback Packet Action on the VPP dataplane#258
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[doc][vpp] HLD for Router Interface Loopback Packet Action on the VPP dataplane#258aaronber0614 wants to merge 2 commits into
aaronber0614 wants to merge 2 commits into
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…BACK_PACKET_ACTION) HLD for supporting SAI_ROUTER_INTERFACE_ATTR_LOOPBACK_PACKET_ACTION on sonic-vpp: drop or forward a routed packet that hairpins back out the RIF it ingressed on, via the consolidated sonic_ext VPP plugin's ip4/ip6-loopback output-arc nodes, programmed per-RIF by saivpp. Tracks sonic-net/sonic-buildimage#25788. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: Aaron Bernardino <aaronber@microsoft.com>
§8.4 previously cited only test_loopback_action_basic ("1 passed,
~8.5 min"); the module now runs and passes all three cases
(basic + port_flap + reload) in ~17 min. Update §8.4 and the §9
intro accordingly. No design changes.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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This was referenced Jul 9, 2026
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Moving this HLD to the SONiC design-docs repo per review guidance: it now lives at doc/vpp/vpp-iface-loopback-action.md in sonic-net/SONiC#2462. Closing this PR in favor of that one. The rest of the implementation series is unchanged. |
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Why I did it
Document the design for SAI_ROUTER_INTERFACE_ATTR_LOOPBACK_PACKET_ACTION (drop or forward a routed "hairpin" packet whose next hop egresses its ingress RIF) on the VPP dataplane, ahead of the implementation PRs, so reviewers can align on the approach first.
Feature tracking issue: sonic-net/sonic-buildimage#25788
How I did it
Added a feature HLD under docs/HLD/ following the existing feature-HLD convention: motivation, the RIF-shape matrix, the plugin approach (with alternatives considered), the SAI and CONFIG_DB surface, the VPP node, binary API and counter design, a test plan with live-DUT validation results, and the pre-existing defects found during enablement.
How to verify it
Documentation only. Renders under docs/HLD/vpp-iface-loopback-action.md.
Which release branch to backport (provide reason below if selected)
None.
Description for the changelog
Add HLD: Router Interface Loopback Packet Action on the VPP dataplane.
Part of sonic-net/sonic-buildimage#25788.
PR series (landing order)
Tracking issue: sonic-net/sonic-buildimage#25788