include/linux/mii_timestamper.h

   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 #include <linux/net_tstamp.h>
  13
  14 struct phy_device;
  15
  16 /**
  17  * struct mii_timestamper - Callback interface to MII time stamping devices.
  18  *
  19  * @rxtstamp:   Requests a Rx timestamp for 'skb'.  If the skb is accepted,
  20  *              the MII time stamping device promises to deliver it using
  21  *              netif_rx() as soon as a timestamp becomes available. One of
  22  *              the PTP_CLASS_ values is passed in 'type'.  The function
  23  *              must return true if the skb is accepted for delivery.
  24  *
  25  * @txtstamp:   Requests a Tx timestamp for 'skb'.  The MII time stamping
  26  *              device promises to deliver it using skb_complete_tx_timestamp()
  27  *              as soon as a timestamp becomes available. One of the PTP_CLASS_
  28  *              values is passed in 'type'.
  29  *
  30  * @hwtstamp:   Handles SIOCSHWTSTAMP ioctl for hardware time stamping.
  31  *
  32  * @link_state: Allows the device to respond to changes in the link
  33  *              state.  The caller invokes this function while holding
  34  *              the phy_device mutex.
  35  *
  36  * @ts_info:    Handles ethtool queries for hardware time stamping.
  37  * @device:     Remembers the device to which the instance belongs.
  38  *
  39  * Drivers for PHY time stamping devices should embed their
  40  * mii_timestamper within a private structure, obtaining a reference
  41  * to it using container_of().
  42  *
  43  * Drivers for non-PHY time stamping devices should return a pointer
  44  * to a mii_timestamper from the probe_channel() callback of their
  45  * mii_timestamping_ctrl interface.
  46  */
  47 struct mii_timestamper {
  48         bool (*rxtstamp)(struct mii_timestamper *mii_ts,
  49                          struct sk_buff *skb, int type);
  50
  51         void (*txtstamp)(struct mii_timestamper *mii_ts,
  52                          struct sk_buff *skb, int type);
  53
  54         int  (*hwtstamp)(struct mii_timestamper *mii_ts,
  55                          struct kernel_hwtstamp_config *kernel_config,
  56                          struct netlink_ext_ack *extack);
  57
  58         void (*link_state)(struct mii_timestamper *mii_ts,
  59                            struct phy_device *phydev);
  60
  61         int  (*ts_info)(struct mii_timestamper *mii_ts,
  62                         struct kernel_ethtool_ts_info *ts_info);
  63
  64         struct device *device;
  65 };
  66
  67 /**
  68  * struct mii_timestamping_ctrl - MII time stamping controller interface.
  69  *
  70  * @probe_channel:      Callback into the controller driver announcing the
  71  *                      presence of the 'port' channel.  The 'device' field
  72  *                      had been passed to register_mii_tstamp_controller().
  73  *                      The driver must return either a pointer to a valid
  74  *                      MII timestamper instance or PTR_ERR.
  75  *
  76  * @release_channel:    Releases an instance obtained via .probe_channel.
  77  */
  78 struct mii_timestamping_ctrl {
  79         struct mii_timestamper *(*probe_channel)(struct device *device,
  80                                                  unsigned int port);
  81         void (*release_channel)(struct device *device,
  82                                 struct mii_timestamper *mii_ts);
  83 };
  84
  85 #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
  86
  87 int register_mii_tstamp_controller(struct device *device,
  88                                    struct mii_timestamping_ctrl *ctrl);
  89
  90 void unregister_mii_tstamp_controller(struct device *device);
  91
  92 struct mii_timestamper *register_mii_timestamper(struct device_node *node,
  93                                                  unsigned int port);
  94
  95 void unregister_mii_timestamper(struct mii_timestamper *mii_ts);
  96
  97 #else
  98
  99 static inline
 100 int register_mii_tstamp_controller(struct device *device,
 101                                    struct mii_timestamping_ctrl *ctrl)
 102 {
 103         return -EOPNOTSUPP;
 104 }
 105
 106 static inline void unregister_mii_tstamp_controller(struct device *device)
 107 {
 108 }
 109
 110 static inline
 111 struct mii_timestamper *register_mii_timestamper(struct device_node *node,
 112                                                  unsigned int port)
 113 {
 114         return NULL;
 115 }
 116
 117 static inline void unregister_mii_timestamper(struct mii_timestamper *mii_ts)
 118 {
 119 }
 120
 121 #endif
 122
 123 #endif