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net/netdev: add NETDEV_TX_STAMP and handle SIOCETHTOOL ETHTOOL_GET_TS_INFO

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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>
This commit is contained in:
Claude 2026-09-25 16:37:16 +00:00 • committed by Alan C. Assis
parent b7001f2d9f
commit 6e14c8cfe5
3 changed files with 117 additions and 0 deletions
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31
include/nuttx/ethtool.h
View file

@ -23,6 +23,12 @@
#ifndef __INCLUDE_NUTTX_ETHTOOL_H
#define __INCLUDE_NUTTX_ETHTOOL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
@ -221,4 +227,29 @@ struct ethtool_cmd
uint32_t reserved[2];
};
/* struct ethtool_ts_info - holds a device's timestamping and PHC
* association (ETHTOOL_GET_TS_INFO), same layout as Linux.
* @cmd: command number = %ETHTOOL_GET_TS_INFO
* @so_timestamping: bit mask of the sum of the supported SO_TIMESTAMPING
* flags (SOF_TIMESTAMPING_*)
* @phc_index: device index of the associated PHC, or -1 if there is none
* @tx_types: bit mask of the supported hwtstamp_tx_types values; zero,
* NuttX has no SIOCSHWTSTAMP to select them
* @tx_reserved: reserved for future use, zero
* @rx_filters: bit mask of the supported hwtstamp_rx_filters values; zero,
* NuttX has no SIOCSHWTSTAMP to select them
* @rx_reserved: reserved for future use, zero
*/
struct ethtool_ts_info
{
uint32_t cmd;
uint32_t so_timestamping;
int32_t phc_index;
uint32_t tx_types;
uint32_t tx_reserved[3];
uint32_t rx_filters;
uint32_t rx_reserved[3];
};
#endif

1
include/nuttx/net/netdev.h
View file

@ -85,6 +85,7 @@
#define NETDEV_TX_CSUM (1 << 1) /* Netdev support hardware tx checksum */
#define NETDEV_RX_CSUM (1 << 2) /* Netdev support hardware rx checksum */
#define NETDEV_RX_STAMP (1 << 3) /* Netdev support hardware timestamp */
#define NETDEV_TX_STAMP (1 << 4) /* Netdev provides hardware TX timestamps */
/* Determine the largest possible address */