iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

selftests: drv-net: rss_ctx: test flow rehashing without impacting traffic

Browse Source 
Some workloads may want to rehash the flows in response to an imbalance.
Most effective way to do that is changing the RSS key. Check that changing
the key does not cause link flaps or traffic disruption.

Disrupting traffic for key update is not incorrect, but makes the key
update unusable for rehashing under load.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20240708213627.226025-6-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-07-08 14:36:27 -07:00
parent 7e3e5b0bc5
commit 933048fec4
1 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
tools/testing/selftests/drivers/net/hw/rss_ctx.py
View File

@ -244,6 +244,36 @@ def test_rss_resize(cfg):
f"Table imbalance after resize: {data['rss-indirection-table']}")
def test_hitless_key_update(cfg):
"""Test that flows may be rehashed without impacting traffic.
Some workloads may want to rehash the flows in response to an imbalance.
Most effective way to do that is changing the RSS key. Check that changing
the key does not cause link flaps or traffic disruption.
Disrupting traffic for key update is not a bug, but makes the key
update unusable for rehashing under load.
"""
data = get_rss(cfg)
key_len = len(data['rss-hash-key'])
key = _rss_key_rand(key_len)
tgen = GenerateTraffic(cfg)
try:
errors0, carrier0 = get_drop_err_sum(cfg)
t0 = datetime.datetime.now()
ethtool(f"-X {cfg.ifname} hkey " + _rss_key_str(key))
t1 = datetime.datetime.now()
errors1, carrier1 = get_drop_err_sum(cfg)
finally:
tgen.wait_pkts_and_stop(5000)
ksft_lt((t1 - t0).total_seconds(), 0.2)
ksft_eq(errors1 - errors1, 0)
ksft_eq(carrier1 - carrier0, 0)
def test_rss_context(cfg, ctx_cnt=1, create_with_cfg=None):
"""
Test separating traffic into RSS contexts.
@ -479,7 +509,7 @@ def main() -> None:
cfg.netdevnl = NetdevFamily()
ksft_run([test_rss_key_indir, test_rss_queue_reconfigure,
test_rss_resize,
test_rss_resize, test_hitless_key_update,
test_rss_context, test_rss_context4, test_rss_context32,
test_rss_context_queue_reconfigure,
test_rss_context_overlap, test_rss_context_overlap2,