[doc][vpp] HLD for Router Interface Loopback Packet Action on the VPP dataplane - #2462
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[doc][vpp] HLD for Router Interface Loopback Packet Action on the VPP dataplane#2462aaronber0614 wants to merge 1 commit into
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This was referenced Jul 13, 2026
[vpp] Add sonic_ext RIF loopback packet action nodes and binary API
sonic-net/sonic-platform-vpp#259
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… dataplane Signed-off-by: aaronber0614 <82425405+aaronber0614@users.noreply.github.com>
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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
Note: this HLD was moved here from sonic-net/sonic-platform-vpp#258 (now closed) to follow the SONiC convention of keeping design documents in the SONiC repo under doc/vpp/.
How I did it
Added a feature HLD under doc/vpp/ following the existing VPP 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 doc/vpp/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