USB: P6-B real CDC ECM driver replacing 32-line stub
Cross-referenced with Linux 7.1 drivers/net/usb/cdc_ether.c (984 lines)
and include/uapi/linux/usb/cdc.h.
Replaces the 32-line scan-and-symlink stub with a 230-line real class driver:
Protocol (cdc.h:237-303):
- SET_ETHERNET_PACKET_FILTER (0x43) — promiscuous + directed + broadcast
+ multicast filter matching Linux default (cdc_ether.c:70-80)
- SET_ETHERNET_MULTICAST_FILTERS (0x40) — constants defined
- SEND_ENCAPSULATED_COMMAND (0x00), GET_ENCAPSULATED_RESPONSE (0x01)
Architecture:
- Finds CDC ECM communications interface (class=02, subclass=06)
- Data interface = ctrl_iface + 1 (Union descriptor pairing assumption)
- Bulk IN + bulk OUT endpoints from data interface
- Optional interrupt endpoint from control interface for CDC notifications
- Bidirectional I/O: bulk IN → stdout (Rx), stdin → bulk OUT (Tx)
- CDC notification handler: NETWORK_CONNECTION (link up/down),
SPEED_CHANGE (tx/rx bitrates), generic notification logging
Pattern matches redbear-acmd and redbear-ftdi: XhciClientHandle,
path deps on local forks, common::setup_logging, cargo template.
vasilito
c7ed62eb30