/* SPDX-License-Identifier: GPL-2.0 */
/*
* Support for generic time stamping devices on MII buses .
* Copyright ( C ) 2018 Richard Cochran < richardcochran @ gmail . com >
*/
#ifndef _LINUX_MII_TIMESTAMPER_H
#define _LINUX_MII_TIMESTAMPER_H
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/net_tstamp.h>
struct phy_device;
/**
* struct mii_timestamper - Callback interface to MII time stamping devices .
*
* @ rxtstamp : Requests a Rx timestamp for ' skb ' . If the skb is accepted ,
* the MII time stamping device promises to deliver it using
* netif_rx ( ) as soon as a timestamp becomes available . One of
* the PTP_CLASS_ values is passed in ' type ' . The function
* must return true if the skb is accepted for delivery .
*
* @ txtstamp : Requests a Tx timestamp for ' skb ' . The MII time stamping
* device promises to deliver it using skb_complete_tx_timestamp ( )
* as soon as a timestamp becomes available . One of the PTP_CLASS_
* values is passed in ' type ' .
*
* @ hwtstamp : Handles SIOCSHWTSTAMP ioctl for hardware time stamping .
*
* @ link_state : Allows the device to respond to changes in the link
* state . The caller invokes this function while holding
* the phy_device mutex .
*
* @ ts_info : Handles ethtool queries for hardware time stamping .
* @ device : Remembers the device to which the instance belongs .
*
* Drivers for PHY time stamping devices should embed their
* mii_timestamper within a private structure , obtaining a reference
* to it using container_of ( ) .
*
* Drivers for non - PHY time stamping devices should return a pointer
* to a mii_timestamper from the probe_channel ( ) callback of their
* mii_timestamping_ctrl interface .
*/
struct mii_timestamper {
bool (*rxtstamp)(struct mii_timestamper *mii_ts,
struct sk_buff *skb, int type);
void (*txtstamp)(struct mii_timestamper *mii_ts,
struct sk_buff *skb, int type);
int (*hwtstamp)(struct mii_timestamper *mii_ts,
struct kernel_hwtstamp_config *kernel_config,
struct netlink_ext_ack *extack);
void (*link_state)(struct mii_timestamper *mii_ts,
struct phy_device *phydev);
int (*ts_info)(struct mii_timestamper *mii_ts,
struct kernel_ethtool_ts_info *ts_info);
struct device *device;
};
/**
* struct mii_timestamping_ctrl - MII time stamping controller interface .
*
* @ probe_channel : Callback into the controller driver announcing the
* presence of the ' port ' channel . The ' device ' field
* had been passed to register_mii_tstamp_controller ( ) .
* The driver must return either a pointer to a valid
* MII timestamper instance or PTR_ERR .
*
* @ release_channel : Releases an instance obtained via . probe_channel .
*/
struct mii_timestamping_ctrl {
struct mii_timestamper *(*probe_channel)(struct device *device,
unsigned int port);
void (*release_channel)(struct device *device,
struct mii_timestamper *mii_ts);
};
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
int register_mii_tstamp_controller(struct device *device,
struct mii_timestamping_ctrl *ctrl);
void unregister_mii_tstamp_controller(struct device *device);
struct mii_timestamper *register_mii_timestamper(struct device_node *node,
unsigned int port);
void unregister_mii_timestamper(struct mii_timestamper *mii_ts);
#else
static inline
int register_mii_tstamp_controller(struct device *device,
struct mii_timestamping_ctrl *ctrl)
{
return -EOPNOTSUPP;
}
static inline void unregister_mii_tstamp_controller(struct device *device)
{
}
static inline
struct mii_timestamper *register_mii_timestamper(struct device_node *node,
unsigned int port)
{
return NULL;
}
static inline void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
{
}
#endif
#endif
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