Add the NETDEV_TX_STAMP capability flag to d_features, next to the
existing NETDEV_RX_STAMP, so a driver can declare that it delivers
hardware TX timestamps.
SIOCETHTOOL and ETHTOOL_GET_TS_INFO were already defined but not
implemented. Add struct ethtool_ts_info, with the same layout as
Linux, and handle SIOCETHTOOL in netdev_ioctl.c so that userspace (such
as ptpd) can query the timestamping capabilities of an interface the
same way linuxptp/ptp4l does on Linux:
- ETHTOOL_GET_TS_INFO fills so_timestamping from d_features:
RX_HARDWARE | RAW_HARDWARE with NETDEV_RX_STAMP, otherwise
RX_SOFTWARE | SOFTWARE (the stack stamps received packets with
CLOCK_REALTIME), and TX_HARDWARE | RAW_HARDWARE with NETDEV_TX_STAMP.
phc_index is -1, tx_types and rx_filters are zero.
- Any other ethtool command is passed to the driver's d_ioctl when
CONFIG_NETDEV_IOCTL is enabled, otherwise -ENOTTY is returned.
Assisted-by: Claude:claude-sonnet-5
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
6e14c8cfe5