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net, stability: Wait for client VM iface#4492

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azhivovk wants to merge 1 commit intoRedHatQE:mainfrom
azhivovk:fix_wait_for_client_stabilize
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net, stability: Wait for client VM iface#4492
azhivovk wants to merge 1 commit intoRedHatQE:mainfrom
azhivovk:fix_wait_for_client_stabilize

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@azhivovk
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@azhivovk azhivovk commented Apr 19, 2026

client_server_active_connection only waited for the server VM's secondary interface to get its DHCP-assigned IP. If the client VM's DHCP hadn't completed yet, iperf3 had no route to the server and exited immediately, causing _ensure_is_running to time out.

The change will fix
test_tcp_connectivity_between_vms_with_localnet_ipam_nic failures on CI.

Summary by CodeRabbit

  • Chores
    • Enhanced internal validation checks during network connection initialization to improve stability.

client_server_active_connection only waited for the server
VM's secondary interface to get its DHCP-assigned IP.
If the client VM's DHCP hadn't completed yet, iperf3 had no
route to the server and exited immediately, causing
_ensure_is_running to time out.

The change will fix
test_tcp_connectivity_between_vms_with_localnet_ipam_nic
failures on CI.

Signed-off-by: Asia Khromov <azhivovk@redhat.com>
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coderabbitai Bot commented Apr 19, 2026

📝 Walkthrough

Walkthrough

The change adds a validation call in the client_server_active_connection function to perform an interface status and IP lookup for the client VM, mirroring the existing server-side lookup, before initializing the TCP server and client components.

Changes

Cohort / File(s) Summary
Client VM Validation
libs/net/traffic_generator.py
Added lookup_iface_status_ip(...) call for client_vm using iface_name and ip_family parameters. The return value is not consumed; this is a validation/side-effect step executed prior to TcpServer and VMTcpClient initialization.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3
✅ Passed checks (3 passed)
Check name Status Explanation
Title check ✅ Passed The title directly addresses the main change: adding a wait for the client VM interface, which is the core fix for the CI test failures.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description check ✅ Passed The PR description adequately explains the problem and solution, though it lacks several template sections like short description, special notes, and jira-ticket.

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/verified

Verified on dual-stack BM with cnv-4.22:
uv run pytest --verbose -rs -s -o log_cli=true --leftovers-collector --tb=native --skip-deprecated-api-test --cluster-sanity-skip-storage-check tests/network/localnet/ipam
Result: 1 passed, 1 deselected, 8 warnings in 596.67s (0:09:56)

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Test execution plan request details

CRITICAL: You MUST post an inline review comment on the first changed line of the first file.
The inline comment should contain the Test Execution Plan with the smoke tests recommendation.
Do NOT submit a formal review - just post the inline comment directly.

As an expert software testing engineer, analyze all modified files in this PR and create a targeted test execution plan.
You will post an inline review comment with the test execution plan on the first changed file.
If you fail to run or post a comment, retry.

Analysis Requirements:

  1. Examine code changes in each modified file
  2. Identify affected code paths, functions, and classes
  3. Analyze pytest-specific elements: fixtures (scope, dependencies), parametrization, markers, conftest changes
  4. Trace test dependencies through imports, shared utilities, and fixture inheritance
  5. Detect new tests introduced in the PR
  6. Smoke Test Impact Analysis: Determine if any changes could affect smoke tests by checking:
    • Changes to files/functions used by tests marked with @pytest.mark.smoke
    • Changes to fixtures or utilities imported by smoke tests
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Your deliverable:
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Test Execution Plan

  • Run smoke tests: True / False (Based on your smoke test impact analysis - True if any changes may affect smoke tests)
  • path/to/test_file.py - When the entire test file needs verification
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Remember: The pull request review is visible to users. Additional comments are redundant noise.

CRITICAL: Before setting "Run smoke tests: True", you MUST use shell scripts to:
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- Confirm the dependency path exists; do NOT assume based on scope or semantics
- Be conservative: Session-scoped fixtures or infrastructure-sounding names do NOT
automatically mean smoke test impact. Only flag smoke test impact when you can
demonstrate a concrete dependency path.
WRONG: "This session-scoped storage fixture might affect smoke tests"
RIGHT: "Smoke test X uses fixture Y, which depends on the changed fixture Z"

Traffic runs with infinite duration until context exits.
"""
server_ip = str(lookup_iface_status_ip(vm=server_vm, iface_name=spec_logical_network, ip_family=ip_family))
lookup_iface_status_ip(vm=client_vm, iface_name=spec_logical_network, ip_family=ip_family)
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Test Execution Plan

  • Run smoke tests: False (no smoke test has a traceable dependency on libs/net/traffic_generator.py)
  • tests/network/localnet/ipam/test_connectivity.py::test_tcp_connectivity_between_vms_with_localnet_ipam_nic

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coderabbitai Bot commented Apr 19, 2026

Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Find all usages of client_server_active_connection
rg -rn "client_server_active_connection" --type=py -C2

# Find all smoke tests
rg -rn "pytest.mark.smoke" --type=py -B2 | grep "def test_"

# Check if any smoke test imports from libs/net/traffic_generator
rg -rn "traffic_generator\|client_server_active_connection" --type=py tests/ | grep -i smoke || true

# Find what file contains client_server_active_connection and what tests import it
rg -rn "from.*traffic_generator.*import\|import.*traffic_generator" --type=py

Length of output: 9764


🏁 Script executed:

#!/bin/bash
# Check if any files using traffic_generator have smoke markers
rg -ln "pytest.mark.smoke" --type=py | xargs -I{} sh -c 'grep -l "traffic_generator\|client_server_active_connection" {} 2>/dev/null' || true

# Get the first changed line of libs/net/traffic_generator.py in this PR
git diff origin/main...HEAD -- libs/net/traffic_generator.py | head -30

# Find the exact line number of the change
grep -n "lookup_iface_status_ip" libs/net/traffic_generator.py | head -10

Length of output: 936


🏁 Script executed:

#!/bin/bash
# Get PR head SHA
PR_SHA=$(gh pr view 4492 --repo RedHatQE/openshift-virtualization-tests --json headRefOid -q '.headRefOid')

# Post inline review comment on the changed line
gh api \
  --method POST \
  repos/RedHatQE/openshift-virtualization-tests/pulls/4492/reviews \
  --field commit_id="$PR_SHA" \
  --field event="COMMENT" \
  --field "comments[][path]=libs/net/traffic_generator.py" \
  --field "comments[][line]=268" \
  --field "comments[][side]=RIGHT" \
  --field "comments[][body]=**Test Execution Plan**

- **Run smoke tests: False** _(no smoke test has a traceable dependency on \`libs/net/traffic_generator.py\`)_
- \`tests/network/localnet/ipam/test_connectivity.py::test_tcp_connectivity_between_vms_with_localnet_ipam_nic\`"

Length of output: 1735



🧠 Learnings used
Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T10:28:54.212Z
Learning: In the openshift-virtualization-tests repository, when determining smoke test impact for test execution plans, only set "Run smoke tests: True" if there is a verified, traceable dependency path from smoke tests to the changed code. Session-scoped fixtures or infrastructure-sounding changes do NOT automatically imply smoke test impact - the dependency chain must be explicitly verified using shell scripts before recommending smoke test execution.

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-22T15:56:00.157Z
Learning: In the openshift-virtualization-tests repository, when responding to test execution plan requests from openshift-virtualization-qe-bot-3, do NOT use "REQUEST_CHANGES" review type if the PR author has already marked the PR as verified (e.g., with `/verified` command). Test execution plans are informational guides, not blocking requirements. Use COMMENT event for informational test plans, or only REQUEST_CHANGES if there are actual code issues that need to be addressed before merging.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T14:00:59.076Z
Learning: In the openshift-virtualization-tests repository, when responding to test execution plan requests from openshift-virtualization-qe-bot-3, CodeRabbit must post ONLY an inline review comment on the Files Changed tab and then stop immediately without generating any follow-up comments in the PR discussion thread. No acknowledgment messages, no confirmation of posting, no explanation - silence after posting the inline review equals success. Additional comments create empty/meaningless reviews that clutter the PR.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3062
File: conftest.py:333-333
Timestamp: 2025-12-16T20:11:03.645Z
Learning: In the openshift-virtualization-tests repository, when determining smoke test impact for changes affecting py_config["os_login_param"], follow this verification methodology: (1) Find all smoke tests: `rg "pytest.mark.smoke" --type=py -B2 | grep "def test_"`, (2) For each smoke test file, search for VM creation patterns: `rg "VirtualMachineForTests|running_vm|VirtualMachineForTestsFromTemplate|wait_for_ssh|check_ssh_connectivity"`, (3) Trace the dependency chain: smoke test → VirtualMachineForTests/running_vm() → wait_for_ssh_connectivity() (default enabled) → vm.login_params property → py_config["os_login_param"][vm.os_flavor], (4) Check utilities/virt.py for login_params usage: `rg "os_login_param|login_params" utilities/virt.py -C3`. Any smoke test creating VMs with default SSH connectivity checks (running_vm with check_ssh_connectivity=True) depends on os_login_param, even if the test doesn't directly reference it.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-09-29T19:05:24.987Z
Learning: For PR `#1904` test execution, the critical validation point is test_connectivity_over_migration_between_localnet_vms which should fail gracefully on cloud clusters but pass on bare-metal/PSI clusters, representing the core nmstate conditional logic functionality.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3062
File: conftest.py:333-333
Timestamp: 2025-12-16T15:09:49.597Z
Learning: In the openshift-virtualization-tests repository, when conftest.py or utilities/bitwarden.py changes affect py_config["os_login_param"], smoke test impact must be determined by: (1) finding all smoke tests using `rg "pytest.mark.smoke"`, (2) checking each for VM creation patterns (VirtualMachineForTests, running_vm, VirtualMachineForTestsFromTemplate), (3) tracing whether running_vm is called with default check_ssh_connectivity=True, which accesses vm.login_params property that reads py_config["os_login_param"][vm.os_flavor]. The dependency chain is: smoke test → VM creation → running_vm → wait_for_ssh_connectivity → vm.login_params → os_login_param. Any smoke test creating VMs with SSH connectivity (the default) depends on os_login_param.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-09-29T19:05:24.987Z
Learning: The test execution plan for PR `#1904` focuses on cluster-type conditional logic where nmstate functionality is bypassed on cloud clusters (Azure/AWS) but fully functional on bare-metal/PSI clusters, requiring different test strategies for each environment type.

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3598
File: tests/network/sriov/conftest.py:62-71
Timestamp: 2026-01-28T17:36:14.188Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, sanity checks validate that the cluster supports at least one IP family (IPv4 or IPv6) before SR-IOV tests run. Therefore, defensive guards checking for empty IP addresses in SR-IOV VM fixtures (like `sriov_vm` in tests/network/sriov/conftest.py) are not necessary—if neither `ipv4_supported_cluster` nor `ipv6_supported_cluster` is True, the cluster is considered broken and will fail sanity validation.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 0
File: :0-0
Timestamp: 2025-12-16T14:06:22.391Z
Learning: In the openshift-virtualization-tests repository, when posting test execution plan inline review comments using GitHub API, the full test execution plan content must go in the `comments[].body` field (which appears on Files Changed tab), NOT in the top-level `body` field (which appears in PR discussion thread). The top-level `body` field should be omitted or left empty to avoid posting redundant comments in the PR discussion thread.

Learnt from: dshchedr
Repo: RedHatQE/openshift-virtualization-tests PR: 4118
File: utilities/database.py:0-0
Timestamp: 2026-03-17T01:32:13.674Z
Learning: In RedHatQE/openshift-virtualization-tests, maintainer dshchedr prefers CodeRabbit to post targeted inline comments on the Files changed tab for each applicable location rather than aggregating multiple issues into a single discussion thread.

Learnt from: yossisegev
Repo: RedHatQE/openshift-virtualization-tests PR: 3358
File: tests/network/sriov/test_sriov.py:21-21
Timestamp: 2026-01-07T09:52:22.771Z
Learning: For PRs that only remove or modify pytest markers (like removing pytest.mark.post_upgrade) without changing test logic in openshift-virtualization-tests, collection verification using `pytest --collect-only` is sufficient. Full test execution is not required to verify marker-only changes.

Learnt from: EdDev
Repo: RedHatQE/openshift-virtualization-tests PR: 3612
File: tests/network/user_defined_network/ip_specification/test_ip_specification.py:10-10
Timestamp: 2026-01-26T20:29:54.623Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, when introducing STD (Standard Test Definition) PRs that define test case structure without implementation, it's acceptable and intentional to use `__test__ = False` to block pytest collection until the tests are fully implemented in a follow-up PR. The STD workflow involves: (1) defining test structure, markers, and documentation first, (2) implementing the actual test logic and removing the collection blocker in a subsequent PR.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 4328
File: tests/network/flat_overlay/test_multi_network_policy.py:32-32
Timestamp: 2026-04-14T16:15:36.741Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, when reviewing any PR with "Quarantine" in the title or a `quarantine` label, always verify compliance with docs/QUARANTINE_GUIDELINES.md:
- Category 1 (Product Bug): must use `pytest.mark.jira("CNV-XXXXX", run=False)` — the `pytest_jira` plugin conditionally skips the test when the Jira issue is open. Do NOT suggest replacing this with `xfail`.
- Category 2 (Automation Issue): must use `pytest.mark.xfail(run=False, reason=...)` — pytest itself handles the skip.
Flag any quarantine PR that uses the wrong category marker, is missing a Jira ticket reference, or uses `run=False` in the wrong context. Raising these compliance questions is always appropriate for quarantine PRs, even if the final resolution confirms the marker is correct.

Learnt from: dshchedr
Repo: RedHatQE/openshift-virtualization-tests PR: 4118
File: utilities/database.py:0-0
Timestamp: 2026-03-17T01:32:13.674Z
Learning: In RedHatQE/openshift-virtualization-tests, maintainer dshchedr prefers CodeRabbit to post targeted inline comments on the Files Changed tab at each applicable location rather than aggregating multiple issues into a single PR discussion thread reply.

Learnt from: servolkov
Repo: RedHatQE/openshift-virtualization-tests PR: 1776
File: libs/net/node_network.py:25-31
Timestamp: 2025-08-20T23:43:28.117Z
Learning: In the RedHatQE/openshift-virtualization-tests project, servolkov's team always uses bare metal (BM) clusters with IPv4 setup in their testing environment, making defensive checks for IPv4 data presence potentially redundant in their networking code.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3371
File: scripts/tests_analyzer/compare_coderabbit_decisions.py:199-289
Timestamp: 2026-01-13T10:06:14.822Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers to keep pagination loops inline rather than extracting them into generic helper functions when the loops have different URL patterns and unique post-processing logic, as the inline approach improves readability and makes each endpoint's behavior more explicit.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 3228
File: .coderabbit.yaml:30-41
Timestamp: 2026-01-05T10:33:55.037Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers minimal pre-merge checks in CodeRabbit configuration: only docstrings enforcement (80% threshold) is needed, not title or description checks.

Learnt from: rnetser
Repo: RedHatQE/openshift-virtualization-tests PR: 2469
File: utilities/sanity.py:139-142
Timestamp: 2025-11-08T07:36:57.616Z
Learning: In the openshift-virtualization-tests repository, user rnetser prefers to keep refactoring PRs (like PR `#2469`) strictly focused on moving/organizing code into more granular modules without adding new functionality, error handling, or behavioral changes. Such improvements should be handled in separate PRs.

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 1160
File: tests/storage/storage_migration/test_mtc_storage_class_migration.py:165-176
Timestamp: 2025-06-17T07:45:37.776Z
Learning: In the openshift-virtualization-tests repository, user jpeimer prefers explicit fixture parameters over composite fixtures in test methods, even when there are many parameters, as they find this approach more readable and maintainable for understanding test dependencies.

Learnt from: jpeimer
Repo: RedHatQE/openshift-virtualization-tests PR: 3571
File: tests/storage/storage_migration/utils.py:158-167
Timestamp: 2026-01-25T13:18:26.819Z
Learning: In the openshift-virtualization-tests repository, user jpeimer prefers to avoid nitpicky style changes (e.g., removing `.keys()` from dict membership checks) because verifying every change is expensive. Be cautious about suggesting low-impact stylistic improvements that require verification overhead.

Learnt from: akri3i
Repo: RedHatQE/openshift-virtualization-tests PR: 1210
File: tests/virt/cluster/general/mass_machine_type_transition_tests/conftest.py:24-64
Timestamp: 2025-06-23T19:28:20.281Z
Learning: In OpenShift Virtualization mass machine type transition tests, the machine type glob pattern "pc-q35-rhel8.*.*" is intentionally hard-coded in the kubevirt_api_lifecycle_automation_job as it's used only once for this specific test case, with plans to update it in the future if the job needs to support other machine types.

Learnt from: RoniKishner
Repo: RedHatQE/openshift-virtualization-tests PR: 1411
File: utilities/os_utils.py:246-279
Timestamp: 2025-07-22T17:13:59.166Z
Learning: In the RedHatQE/openshift-virtualization-tests repository, CentOS preferences follow the format "centos-stream<version>" (e.g., "centos-stream9", "centos-stream10"). The generate_instance_type_centos_os_matrix function correctly uses regex to extract numeric versions and constructs the latest version string in the same format as the input preferences for proper comparison.

Learnt from: EdDev
Repo: RedHatQE/openshift-virtualization-tests PR: 3649
File: tests/network/user_defined_network/ip_specification/conftest.py:32-48
Timestamp: 2026-01-29T15:01:54.833Z
Learning: In tests/network/user_defined_network/ip_specification/conftest.py and similar VM fixtures, calling `vm.wait_for_agent_connected()` after `vm.start()` is the correct and sufficient pattern. There is no need to add `wait_for_ready_status(status=True)` before it, because wait_for_agent_connected() already verifies the guest OS is running (not just powered on), which is a stronger validation than ready status.

Learnt from: vamsikrishna-siddu
Repo: RedHatQE/openshift-virtualization-tests PR: 2199
File: tests/storage/test_online_resize.py:108-113
Timestamp: 2025-09-28T14:43:07.181Z
Learning: In the openshift-virtualization-tests repo, PR `#2199` depends on PR `#2139` which adds the OS_FLAVOR attribute to the Images.Cirros class, making Images.Cirros.OS_FLAVOR available for conditional logic in tests.

Learnt from: EdDev
Repo: RedHatQE/openshift-virtualization-tests PR: 3930
File: tests/network/vmi/libippersistence.py:79-88
Timestamp: 2026-02-23T11:39:07.449Z
Learning: In tests/network/vmi/libippersistence.py, the monitor_vmi_interfaces helper function should accept an optional expected_interface_count parameter (default=2) to allow tests with different NIC configurations to reuse the monitoring logic without hardcoding the interface count.

Learnt from: EdDev
Repo: RedHatQE/openshift-virtualization-tests PR: 3930
File: tests/network/vmi/libippersistence.py:79-88
Timestamp: 2026-02-23T11:39:07.449Z
Learning: In tests/network/vmi/libippersistence.py, the monitor_vmi_interfaces helper function should accept an optional expected_interface_count parameter (default=2) to allow tests with different NIC configurations to reuse the monitoring logic without hardcoding the interface count.

Learnt from: vamsikrishna-siddu
Repo: RedHatQE/openshift-virtualization-tests PR: 2199
File: tests/storage/test_online_resize.py:108-113
Timestamp: 2025-09-28T14:43:07.181Z
Learning: In the openshift-virtualization-tests repo, PR `#2199` depends on PR `#2139` which adds architecture-specific OS_FLAVOR attributes to the Images.Cirros class (OS_FLAVOR_CIRROS for x86_64/ARM64, OS_FLAVOR_FEDORA for s390x), enabling conditional logic based on the underlying OS flavor in tests.

Learnt from: azhivovk
Repo: RedHatQE/openshift-virtualization-tests PR: 3974
File: tests/network/localnet/test_jumbo_frames.py:0-0
Timestamp: 2026-03-12T17:47:23.380Z
Learning: In `tests/network/localnet/test_jumbo_frames.py`, an empty-list assertion on `vm2_addresses` (result of `filter_link_local_addresses(iface.ipAddresses)`) after `lookup_iface_status` is redundant. VMs are provisioned with explicit IPv4/IPv6 addresses via `ip_addresses_from_pool`, and session-scoped sanity checks guarantee at least one IP family is active. Do not flag missing empty-list guards on `filter_link_local_addresses` results in localnet tests.

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Thank you Asia

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