Ethtool – Diagnostic Approach for Network Issues in Linux
Talkat Embedded Linux Conference @ Open Source Summit North America 2022 · on Friday, 2022-06-24· at 14:50· Room 201/202 (Level 2), JW Marriott Austin, 110 E 2nd Street Austin, TX 78701·
summary
Adds an ethtool extension that reads MMC registers via SIOCETHTOOL ioctl and get_string_set, with a userspace flag show MMC and a kernel hook estimac_get_mmc_stats that converts register values to 32‑bit bitmaps and prints each bit as enabled/disabled. Tested on DesignWare Ethernet QoS IP and a Synopsys automotive SoC, it detects an underflow interrupt that explains packet drops for frames >100 bytes, reports exact drop counts, and works end‑to‑end; upstreaming to mainline is planned.
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