On Mon, Nov 16, 2020 at 01:34:53PM -0800, Jakub Kicinski wrote: > You must expose relevant statistics via the normal get_stats64 NDO > before you start dumping free form stuff in ethtool -S. Completely agree on the point, Jakub, but to be honest we don't give him that possibility within the DSA framework today, see .ndo_get_stats64 in net/dsa/slave.c which returns the generic dev_get_tstats64 implementation, and not something that hooks into the hardware counters, or into the driver at all, for that matter. But it's good that you raise the point, I was thinking too that we should do better in terms of keeping the software counters in sync with the hardware. But what would be a good reference for keeping statistics on an offloaded interface? Is it ok to just populate the netdev counters based on the hardware statistics? And what about the statistics gathered today in software, could we return them maybe via something like ifstat --extended=cpu_hits?