cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mii_timestamper.h (3653B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Support for generic time stamping devices on MII buses.
      4 * Copyright (C) 2018 Richard Cochran <richardcochran@gmail.com>
      5 */
      6#ifndef _LINUX_MII_TIMESTAMPER_H
      7#define _LINUX_MII_TIMESTAMPER_H
      8
      9#include <linux/device.h>
     10#include <linux/ethtool.h>
     11#include <linux/skbuff.h>
     12
     13struct phy_device;
     14
     15/**
     16 * struct mii_timestamper - Callback interface to MII time stamping devices.
     17 *
     18 * @rxtstamp:	Requests a Rx timestamp for 'skb'.  If the skb is accepted,
     19 *		the MII time stamping device promises to deliver it using
     20 *		netif_rx() as soon as a timestamp becomes available. One of
     21 *		the PTP_CLASS_ values is passed in 'type'.  The function
     22 *		must return true if the skb is accepted for delivery.
     23 *
     24 * @txtstamp:	Requests a Tx timestamp for 'skb'.  The MII time stamping
     25 *		device promises to deliver it using skb_complete_tx_timestamp()
     26 *		as soon as a timestamp becomes available. One of the PTP_CLASS_
     27 *		values is passed in 'type'.
     28 *
     29 * @hwtstamp:	Handles SIOCSHWTSTAMP ioctl for hardware time stamping.
     30 *
     31 * @link_state: Allows the device to respond to changes in the link
     32 *		state.  The caller invokes this function while holding
     33 *		the phy_device mutex.
     34 *
     35 * @ts_info:	Handles ethtool queries for hardware time stamping.
     36 * @device:	Remembers the device to which the instance belongs.
     37 *
     38 * Drivers for PHY time stamping devices should embed their
     39 * mii_timestamper within a private structure, obtaining a reference
     40 * to it using container_of().
     41 *
     42 * Drivers for non-PHY time stamping devices should return a pointer
     43 * to a mii_timestamper from the probe_channel() callback of their
     44 * mii_timestamping_ctrl interface.
     45 */
     46struct mii_timestamper {
     47	bool (*rxtstamp)(struct mii_timestamper *mii_ts,
     48			 struct sk_buff *skb, int type);
     49
     50	void (*txtstamp)(struct mii_timestamper *mii_ts,
     51			 struct sk_buff *skb, int type);
     52
     53	int  (*hwtstamp)(struct mii_timestamper *mii_ts,
     54			 struct ifreq *ifreq);
     55
     56	void (*link_state)(struct mii_timestamper *mii_ts,
     57			   struct phy_device *phydev);
     58
     59	int  (*ts_info)(struct mii_timestamper *mii_ts,
     60			struct ethtool_ts_info *ts_info);
     61
     62	struct device *device;
     63};
     64
     65/**
     66 * struct mii_timestamping_ctrl - MII time stamping controller interface.
     67 *
     68 * @probe_channel:	Callback into the controller driver announcing the
     69 *			presence of the 'port' channel.  The 'device' field
     70 *			had been passed to register_mii_tstamp_controller().
     71 *			The driver must return either a pointer to a valid
     72 *			MII timestamper instance or PTR_ERR.
     73 *
     74 * @release_channel:	Releases an instance obtained via .probe_channel.
     75 */
     76struct mii_timestamping_ctrl {
     77	struct mii_timestamper *(*probe_channel)(struct device *device,
     78						 unsigned int port);
     79	void (*release_channel)(struct device *device,
     80				struct mii_timestamper *mii_ts);
     81};
     82
     83#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
     84
     85int register_mii_tstamp_controller(struct device *device,
     86				   struct mii_timestamping_ctrl *ctrl);
     87
     88void unregister_mii_tstamp_controller(struct device *device);
     89
     90struct mii_timestamper *register_mii_timestamper(struct device_node *node,
     91						 unsigned int port);
     92
     93void unregister_mii_timestamper(struct mii_timestamper *mii_ts);
     94
     95#else
     96
     97static inline
     98int register_mii_tstamp_controller(struct device *device,
     99				   struct mii_timestamping_ctrl *ctrl)
    100{
    101	return -EOPNOTSUPP;
    102}
    103
    104static inline void unregister_mii_tstamp_controller(struct device *device)
    105{
    106}
    107
    108static inline
    109struct mii_timestamper *register_mii_timestamper(struct device_node *node,
    110						 unsigned int port)
    111{
    112	return NULL;
    113}
    114
    115static inline void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
    116{
    117}
    118
    119#endif
    120
    121#endif