/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LINUX_NET_TIMESTAMPING_H_
#define _LINUX_NET_TIMESTAMPING_H_

#include <uapi/linux/net_tstamp.h>

enum hwtstamp_source {
    HWTSTAMP_SOURCE_NETDEV,
    HWTSTAMP_SOURCE_PHYLIB,
};

/**
 * struct kernel_hwtstamp_config - Kernel copy of struct hwtstamp_config
 *
 * @flags: see struct hwtstamp_config
 * @tx_type: see struct hwtstamp_config
 * @rx_filter: see struct hwtstamp_config
 * @ifr: pointer to ifreq structure from the original ioctl request, to pass to
 *    a legacy implementation of a lower driver
 * @copied_to_user: request was passed to a legacy implementation which already
 *    copied the ioctl request back to user space
 * @source: indication whether timestamps should come from the netdev or from
 *    an attached phylib PHY
 *
 * Prefer using this structure for in-kernel processing of hardware
 * timestamping configuration, over the inextensible struct hwtstamp_config
 * exposed to the %SIOCGHWTSTAMP and %SIOCSHWTSTAMP ioctl UAPI.
 */
struct kernel_hwtstamp_config {
    int flags;
    int tx_type;
    int rx_filter;
    struct ifreq *ifr;
    bool copied_to_user;
    enum hwtstamp_source source;
};

static inline void hwtstamp_config_to_kernel(struct kernel_hwtstamp_config *kernel_cfg,
                         const struct hwtstamp_config *cfg)
{
    kernel_cfg->flags = cfg->flags;
    kernel_cfg->tx_type = cfg->tx_type;
    kernel_cfg->rx_filter = cfg->rx_filter;
}

static inline void hwtstamp_config_from_kernel(struct hwtstamp_config *cfg,
                           const struct kernel_hwtstamp_config *kernel_cfg)
{
    cfg->flags = kernel_cfg->flags;
    cfg->tx_type = kernel_cfg->tx_type;
    cfg->rx_filter = kernel_cfg->rx_filter;
}

static inline bool kernel_hwtstamp_config_changed(const struct kernel_hwtstamp_config *a,
                          const struct kernel_hwtstamp_config *b)
{
    return a->flags != b->flags ||
           a->tx_type != b->tx_type ||
           a->rx_filter != b->rx_filter;
}

#endif /* _LINUX_NET_TIMESTAMPING_H_ */