[PATCH net-next] selftests: drv-net: rss_ctx: Add retries to test_rss_context_overlap to reduce flakes
From: Zinc Lim <hidden>
Date: 2026-07-02 16:49:52
Also in:
linux-kselftest, lkml
Subsystem:
kernel selftest framework, networking drivers, the rest · Maintainers:
Shuah Khan, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Similar to commit 690043b95c18 ("selftests: drv-net: rss: Add
retries to test_rss_key_indir to reduce flakes"), implement the
retry mechanism for test_rss_context_overlap. This gives the test
more attempts to distribute the flow evenly, as the chance of
flow skewing to one queue is high.
Example failures:
# Check failed 5288 < 7000 traffic on main context (1/2): [2727, 2561, 8961, 6648]
not ok 1 rss_ctx.test_rss_context_overlap
# Check failed 6710 < 7000 traffic on main context (2/2): [9280, 5217, 5358, 1352]
not ok 1 rss_ctx.test_rss_context_overlap
Ran test_rss_context_overlap and test_rss_context_overlap2
over 1,000 consecutive runs with no failures.
Signed-off-by: Zinc Lim <redacted>
---
tools/testing/selftests/drivers/net/hw/rss_ctx.py | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/drivers/net/hw/rss_ctx.py b/tools/testing/selftests/drivers/net/hw/rss_ctx.py
index f36f76d6ca59..5b25fa89c629 100755
--- a/tools/testing/selftests/drivers/net/hw/rss_ctx.py
+++ b/tools/testing/selftests/drivers/net/hw/rss_ctx.py@@ -651,9 +651,14 @@ def test_rss_context_overlap(cfg, other_ctx=0): ntuple = defer(ethtool, f"-N {cfg.ifname} delete {ntuple_id}") # Test the main context - cnts = _get_rx_cnts(cfg) - GenerateTraffic(cfg, port=port).wait_pkts_and_stop(20000) - cnts = _get_rx_cnts(cfg, prev=cnts) + attempts = 3 + for attempt in range(attempts): + cnts = _get_rx_cnts(cfg) + GenerateTraffic(cfg, port=port).wait_pkts_and_stop(20000) + cnts = _get_rx_cnts(cfg, prev=cnts) + if sum(cnts[:2]) >= 7000 and sum(cnts[2:4]) >= 7000: + break + ksft_pr(f"Skewed queue distribution, attempt {attempt + 1}/{attempts}: " + str(cnts)) ksft_ge(sum(cnts[ :4]), 20000, "traffic on main context: " + str(cnts)) ksft_ge(sum(cnts[ :2]), 7000, "traffic on main context (1/2): " + str(cnts))
--
2.53.0-Meta