[srv6]: Add static MySID warm boot support

[BYGX-wcr]

Reconcile route and MySID APP_DB state under one bgp warm-start FSM, make Srv6Orch replay dependency-safe and idempotent, and add focused mock and DVS coverage.

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[mssonicbld]

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[Copilot]

Pull request overview

This PR extends SWSS SRv6 MySID handling to be warm-restart safe by reconciling ROUTE_TABLE and SRV6_MY_SID_TABLE under a single warm-start flow, making MySID replay dependency-safe/idempotent in Srv6Orch, and adding targeted unit + DVS coverage.

Changes:

• Extend WarmStartHelper to manage restoration/reconciliation across multiple APP_DB tables (primary + registered tables).
• Refactor Srv6Orch MySID programming to use retry-cache constraints for VRF/neighbor dependencies and make replay/update paths more idempotent.
• Add mock tests and DVS warm-restart tests for static MySID replay and reconciliation behavior.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
warmrestart/warmRestartHelper.h	Add multi-table context support to WarmStartHelper (registered tables).
warmrestart/warmRestartHelper.cpp	Implement registration, multi-table restore/reconcile, and per-table refresh maps.
tests/test_warm_reboot.py	Add DVS coverage for static MySID warm restart and fpmsyncd timer replay.
tests/mock_tests/warmrestarthelper_ut.cpp	Add UT coverage for multi-table WarmStartHelper reconciliation semantics.
tests/mock_tests/srv6orch_ut.cpp	Add UT coverage for MySID replay idempotence and dependency retry behavior.
tests/mock_tests/mock_table.h	Expose producer operation counters for more precise UT assertions.
tests/mock_tests/mock_table.cpp	Track ProducerStateTable set/del counts in mock DB layer.
tests/mock_tests/fpmsyncd/receive_srv6_mysids_ut.cpp	Add UT coverage for warm-restart deferral/dedup behavior in MySID reception.
tests/mock_tests/fdbsyncd/fake_warmstarthelper.cpp	Update stub WarmStartHelper API to match new methods/signatures.
tests/mock_tests/fake_warmstarthelper.cpp	Extend mock warmstart helper to track refresh maps per table name.
orchagent/vrforch.cpp	Notify Srv6Orch when VRFs become available to unblock MySID retries.
orchagent/srv6orch.h	Expand MySidEntry state tracking; add retry/dependency plumbing and new helpers.
orchagent/srv6orch.cpp	Implement dependency-safe/idempotent MySID programming and stale tunnel cleanup.
orchagent/retrycache.h	Add MySID-specific constraint types (VRF / NEXTHOP).
fpmsyncd/routesync.h	Add table-name-aware warm-restart set/del helpers.
fpmsyncd/routesync.cpp	Warm-restart defer/dedup for SRV6_MY_SID_TABLE via WarmStartHelper multi-table support.
doc/swss-schema.md	Document SRV6_MY_SID_TABLE schema details and warm-restart reconciliation expectations.

[mssonicbld]

/azp run

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[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated no new comments.

Suppressed comments (3)

orchagent/srv6orch.cpp:1720

• When create_my_sid_entry() returns SAI_STATUS_ITEM_ALREADY_EXISTS, handleSaiCreateStatus() maps that to task_success, so this code proceeds as if creation succeeded without ensuring the existing entry is updated to reference the newly-created tunnel/counter. That can leak the newly created resources and leave the in-memory cache claiming a counter/tunnel is attached when it isn’t. Handle ITEM_ALREADY_EXISTS explicitly by applying the desired attributes via set_my_sid_entry_attribute() (or otherwise ensuring resources are attached) before caching/incrementing CRM.

        auto status = sai_srv6_api->create_my_sid_entry(&my_sid_entry, (uint32_t) attributes.size(), attributes.data());
        if (status != SAI_STATUS_SUCCESS)
        {
            SWSS_LOG_ERROR("Failed to create my_sid entry %s, rv %d", key_string.c_str(), status);
            auto handle_status = handleSaiCreateStatus(SAI_API_SRV6, status);

warmrestart/warmRestartHelper.cpp:175

• insertRefreshMap(syncTableName, ...) relies on assert(table != m_tableContexts.end()). In release builds (NDEBUG), this becomes a no-op and dereferencing table->second is undefined behavior if a caller forgets to register the table (or passes the wrong name). It should fail deterministically with a clear error instead of potentially crashing later.

    const std::string key = kfvKey(kfv);
    auto table = m_tableContexts.find(syncTableName);

    assert(table != m_tableContexts.end());
    table->second->refreshMap[key] = kfv;

tests/mock_tests/fake_warmstarthelper.cpp:136

• getMockWarmStartHelperRefreshMapSize() uses g_mockRefreshMaps[tableName], which silently inserts a new empty entry when the table name is unknown. That mutates global test state and can mask bugs where a table was never registered.

size_t getMockWarmStartHelperRefreshMapSize(const std::string &tableName)
{
    return g_mockRefreshMaps[tableName].size();
}