Part 6 · Agents & Protocol IP · Intermediate

Versioning and Delivery: Semantic Releases for VIP Consumers

How to version VIP changes, communicate compatibility impact, package release artifacts, and support safe upgrades across dependent projects.

Why semantic versioning matters for VIP

Reusable VIP often serves many programs simultaneously. Without disciplined versioning, upgrades become risky and teams pin old versions indefinitely.

Semantic versioning gives consumers clear signals: patch for fixes, minor for backward-compatible features, major for breaking changes.

diagram

[VIP][SEMVER] policy

MAJOR:
  breaking API/behavior changes
  required migration actions

MINOR:
  backward-compatible feature additions
  optional new knobs/capabilities

PATCH:
  bug fixes without API break
  no migration required

diagram

[AGT] examples

PATCH:
  fix monitor decode for rare legal burst

MINOR:
  add optional coverage group with default disabled

MAJOR:
  rename transaction enum values or remove cfg fields

Tie every release note entry to compatibility category.
Avoid hidden breaking changes in minor or patch releases.
Use deprecation windows to reduce major-version churn.

Release artifact bundle

Delivery should include source plus evidence and guidance. Consumers need immediate confidence and clear upgrade instructions.

diagram

[VIP] release bundle contents

source:
  vip package files and examples

metadata:
  version tag, compatibility range, build hash

docs:
  changelog, migration notes, quickstart

evidence:
  qualification test summary
  simulator/version compatibility matrix
  known limitations list

diagram

[CI] release pipeline sketch

1) run lint/static checks
2) run VIP qualification suite
3) run backward-compat suite
4) generate release notes from tagged changes
5) publish artifacts and checksums
6) notify consuming teams

diagram

[DOC] changelog quality bar

each entry includes:
  - issue id
  - scope (driver/monitor/cfg/docs/tests)
  - compatibility impact
  - recommended consumer action

Deliver source, docs, and qualification evidence together.
Automate release bundle generation in CI to reduce omissions.
Make changelog entries actionable for integration teams.

Deprecation and migration strategy

Breaking consumers abruptly erodes trust. Deprecate features over at least one minor cycle with clear warnings and migration examples.

diagram

[VIP] deprecation lifecycle

phase 1 (announce):
  mark field/API deprecated in docs
  emit warning with replacement guidance

phase 2 (transition):
  support old and new APIs
  provide translation helpers

phase 3 (major release):
  remove deprecated API
  include strict migration checklist

systemverilog

if (cfg.legacy_timeout_field != 0) begin
  `uvm_warning("DEPRECATED",
    "legacy_timeout_field is deprecated; use timeout_cycles")
  cfg.timeout_cycles = cfg.legacy_timeout_field;
end

diagram

[AGT][DOC] migration note template

before:
  cfg.legacy_timeout_field = 100

after:
  cfg.timeout_cycles = 100

behavioral changes:
  none

validation:
  run vip_timeout_smoke and compare logs

Warn early and provide one-to-one replacement guidance.
Keep temporary compatibility shims explicit and time-bounded.
Use major releases for actual removals only after transition windows.

Consumer upgrade workflow

Support upgrades with a documented workflow: compatibility assessment, branch trial, smoke validation, and staged rollout.

diagram

[SOC] recommended upgrade flow

1) read release notes and compatibility impact
2) map changed VIP APIs against local wrappers
3) run local smoke tests with new version
4) run protocol regression subset
5) roll into nightly full regression
6) tag internal adoption baseline

diagram

[VIP] support matrix example

VIP version   simulators tested          UVM versions
-------------------------------------------------------------
2.3.1         vcs-2025.12, xrun-24.09    UVM-1.2, IEEE-2020
2.4.0         vcs-2025.12, xrun-24.09    UVM-1.2, IEEE-2020
3.0.0         vcs-2026.03, xrun-25.03    IEEE-2020 only

diagram

[CI][DELIVERY] upgrade confidence checks

- no new fatal/warning taxonomy surprises
- transaction schema backward compatibility validated
- active/passive behavior parity preserved
- protocol compliance score unchanged or improved

Key takeaways

Semantic versioning gives consumers predictable upgrade risk signals.
Release bundles should include evidence and migration guidance, not just code.
Deprecation windows preserve trust and reduce forced forks.
Documented upgrade workflows help projects adopt new VIP versions safely.

Common pitfalls

Sneaking breaking behavior into patch or minor releases.
Publishing versions without qualification evidence.
Removing deprecated fields before consumers can migrate.
Omitting simulator/UVM compatibility information from releases.

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