selftests: drv-net: let ethtool stats settle before reading

2026-08-10T23:47:49Z

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. Reviewed-by: Petr Machata Link: https://patch.msgid.link/20260808163653.2460381-2-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests: drv-net: pace ethtool_std_stats packet generation

2026-08-10T23:47:38Z

mausezahn defaults to sending packets back to back at the maximum rate, which can cause packet loss, especially if receiver is running a debug kernel. Space the generated packets out (-d 10usec), like ethtool_rmon already does. Reviewed-by: Petr Machata Link: https://patch.msgid.link/20260808163653.2460381-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests: drivers: hw: add test for the ethtool standard counters

2026-04-02T10:11:04Z

Add a new selftest - ethtool_std_stats.sh - which validates the eth-ctrl, eth-mac and pause standard statistics exported by an interface. Collision related eth-mac counters as well as the error ones will be checked against zero since that is the most likely correct scenario. The central part of this patch is the traffic_test() function which gathers the 'before' counter values, sends a batch of traffic and then interrogates again the same counters in order to determine if the delta is on target. The function receives an array through which the caller can request what counters to be interrogated and, for each of them, what is their target delta value. The output from this selftest looks as follows on a LX2160ARDB board: $ ./run_kselftest.sh -t drivers/net/hw:ethtool_std_stats.sh TAP version 13 1..1 # timeout set to 0 # selftests: drivers/net/hw: ethtool_std_stats.sh # TAP version 13 # 1..26 # ok 1 ethtool_std_stats.eth-ctrl-MACControlFramesTransmitted # ok 2 ethtool_std_stats.eth-ctrl-MACControlFramesReceived # ok 3 ethtool_std_stats.eth-mac-FrameCheckSequenceErrors # ok 4 ethtool_std_stats.eth-mac-AlignmentErrors # ok 5 ethtool_std_stats.eth-mac-FramesLostDueToIntMACXmitError # ok 6 ethtool_std_stats.eth-mac-CarrierSenseErrors # SKIP # ok 7 ethtool_std_stats.eth-mac-FramesLostDueToIntMACRcvError # ok 8 ethtool_std_stats.eth-mac-InRangeLengthErrors # SKIP # ok 9 ethtool_std_stats.eth-mac-OutOfRangeLengthField # SKIP # ok 10 ethtool_std_stats.eth-mac-FrameTooLongErrors # SKIP # ok 11 ethtool_std_stats.eth-mac-FramesAbortedDueToXSColls # SKIP # ok 12 ethtool_std_stats.eth-mac-SingleCollisionFrames # SKIP # ok 13 ethtool_std_stats.eth-mac-MultipleCollisionFrames # SKIP # ok 14 ethtool_std_stats.eth-mac-FramesWithDeferredXmissions # SKIP # ok 15 ethtool_std_stats.eth-mac-LateCollisions # SKIP # ok 16 ethtool_std_stats.eth-mac-FramesWithExcessiveDeferral # SKIP # ok 17 ethtool_std_stats.eth-mac-BroadcastFramesXmittedOK # ok 18 ethtool_std_stats.eth-mac-OctetsTransmittedOK # ok 19 ethtool_std_stats.eth-mac-BroadcastFramesReceivedOK # ok 20 ethtool_std_stats.eth-mac-OctetsReceivedOK # ok 21 ethtool_std_stats.eth-mac-FramesTransmittedOK # ok 22 ethtool_std_stats.eth-mac-MulticastFramesXmittedOK # ok 23 ethtool_std_stats.eth-mac-FramesReceivedOK # ok 24 ethtool_std_stats.eth-mac-MulticastFramesReceivedOK # ok 25 ethtool_std_stats.pause-tx_pause_frames # ok 26 ethtool_std_stats.pause-rx_pause_frames # # 10 skipped test(s) detected. Consider enabling relevant config options to improve coverage. # # Totals: pass:16 fail:0 xfail:0 xpass:0 skip:10 error:0 ok 1 selftests: drivers/net/hw: ethtool_std_stats.sh Please note that not all MACs are counting the software injected pause frames as real Tx pause. For example, on a LS1028ARDB the selftest output will reflect the fact that neither the ENETC MAC, nor the Felix switch MAC are able to detect Tx pause frames injected by software. $ ./run_kselftest.sh -t drivers/net/hw:ethtool_std_stats.sh (...) # # software sent pause frames not detected # ok 25 ethtool_std_stats.pause-tx_pause_frames # XFAIL # ok 26 ethtool_std_stats.pause-rx_pause_frames Signed-off-by: Ioana Ciornei Acked-by: Petr Machata Link: https://patch.msgid.link/20260330152933.2195885-10-ioana.ciornei@nxp.com Signed-off-by: Paolo Abeni

laptop-kernel/tools/testing/selftests/drivers/net/hw/ethtool_std_stats.sh, branch master

selftests: drv-net: let ethtool stats settle before reading

selftests: drv-net: pace ethtool_std_stats packet generation

selftests: drivers: hw: add test for the ethtool standard counters