On 8/8/26 10:36 AM, Jakub Kicinski wrote: > Some devices refresh the statistics exposed via ethtool only > periodically, every stats-block-usecs (as reported by ethtool -c). > ethtool_std_stats and ethtool_rmon sample the counters immediately > after generating traffic, so on such devices they can read stale > values and fail with a delta short of the packets just sent. > > Add a hw_stats_settle() helper which sleeps for 1.25x the configured > stats-block-usecs (defaulting to 20ms when the device reports no, or > a zero, period). Use it for ethtool std stats and RMON. > The 1.25x/20msec heuristic matches what the Python tests do. > > Signed-off-by: Jakub Kicinski <[email protected]> > --- > CC: [email protected] > CC: [email protected] > CC: [email protected] > CC: [email protected] > CC: [email protected] > CC: [email protected] > CC: [email protected] > --- > .../selftests/drivers/net/hw/ethtool_rmon.sh | 2 ++ > .../selftests/drivers/net/hw/ethtool_std_stats.sh | 2 ++ > tools/testing/selftests/net/forwarding/lib.sh | 15 +++++++++++++++ > 3 files changed, 19 insertions(+) >
Reviewed-by: David Ahern <[email protected]>
