release/src-rt-6.x.4708/linux/linux-2.6.36/include/linux/net_tstamp.h

   1 /*
   2  * Userspace API for hardware time stamping of network packets
   3  *
   4  * Copyright (C) 2008,2009 Intel Corporation
   5  * Author: Patrick Ohly <patrick.ohly@intel.com>
   6  *
   7  */
   8
   9 #ifndef _NET_TIMESTAMPING_H
  10 #define _NET_TIMESTAMPING_H
  11
  12 #include <linux/socket.h>   /* for SO_TIMESTAMPING */
  13
  14 /* SO_TIMESTAMPING gets an integer bit field comprised of these values */
  15 enum {
  16         SOF_TIMESTAMPING_TX_HARDWARE = (1<<0),
  17         SOF_TIMESTAMPING_TX_SOFTWARE = (1<<1),
  18         SOF_TIMESTAMPING_RX_HARDWARE = (1<<2),
  19         SOF_TIMESTAMPING_RX_SOFTWARE = (1<<3),
  20         SOF_TIMESTAMPING_SOFTWARE = (1<<4),
  21         SOF_TIMESTAMPING_SYS_HARDWARE = (1<<5),
  22         SOF_TIMESTAMPING_RAW_HARDWARE = (1<<6),
  23         SOF_TIMESTAMPING_MASK =
  24         (SOF_TIMESTAMPING_RAW_HARDWARE - 1) |
  25         SOF_TIMESTAMPING_RAW_HARDWARE
  26 };
  27
  28 /**
  29  * struct hwtstamp_config - %SIOCSHWTSTAMP parameter
  30  *
  31  * @flags:      no flags defined right now, must be zero
  32  * @tx_type:    one of HWTSTAMP_TX_*
  33  * @rx_type:    one of one of HWTSTAMP_FILTER_*
  34  *
  35  * %SIOCSHWTSTAMP expects a &struct ifreq with a ifr_data pointer to
  36  * this structure. dev_ifsioc() in the kernel takes care of the
  37  * translation between 32 bit userspace and 64 bit kernel. The
  38  * structure is intentionally chosen so that it has the same layout on
  39  * 32 and 64 bit systems, don't break this!
  40  */
  41 struct hwtstamp_config {
  42         int flags;
  43         int tx_type;
  44         int rx_filter;
  45 };
  46
  47 /* possible values for hwtstamp_config->tx_type */
  48 enum {
  49         /*
  50          * No outgoing packet will need hardware time stamping;
  51          * should a packet arrive which asks for it, no hardware
  52          * time stamping will be done.
  53          */
  54         HWTSTAMP_TX_OFF,
  55
  56         /*
  57          * Enables hardware time stamping for outgoing packets;
  58          * the sender of the packet decides which are to be
  59          * time stamped by setting %SOF_TIMESTAMPING_TX_SOFTWARE
  60          * before sending the packet.
  61          */
  62         HWTSTAMP_TX_ON,
  63 };
  64
  65 /* possible values for hwtstamp_config->rx_filter */
  66 enum {
  67         /* time stamp no incoming packet at all */
  68         HWTSTAMP_FILTER_NONE,
  69
  70         /* time stamp any incoming packet */
  71         HWTSTAMP_FILTER_ALL,
  72
  73         /* return value: time stamp all packets requested plus some others */
  74         HWTSTAMP_FILTER_SOME,
  75
  76         /* PTP v1, UDP, any kind of event packet */
  77         HWTSTAMP_FILTER_PTP_V1_L4_EVENT,
  78         /* PTP v1, UDP, Sync packet */
  79         HWTSTAMP_FILTER_PTP_V1_L4_SYNC,
  80         /* PTP v1, UDP, Delay_req packet */
  81         HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ,
  82         /* PTP v2, UDP, any kind of event packet */
  83         HWTSTAMP_FILTER_PTP_V2_L4_EVENT,
  84         /* PTP v2, UDP, Sync packet */
  85         HWTSTAMP_FILTER_PTP_V2_L4_SYNC,
  86         /* PTP v2, UDP, Delay_req packet */
  87         HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ,
  88
  89         /* 802.AS1, Ethernet, any kind of event packet */
  90         HWTSTAMP_FILTER_PTP_V2_L2_EVENT,
  91         /* 802.AS1, Ethernet, Sync packet */
  92         HWTSTAMP_FILTER_PTP_V2_L2_SYNC,
  93         /* 802.AS1, Ethernet, Delay_req packet */
  94         HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ,
  95
  96         /* PTP v2/802.AS1, any layer, any kind of event packet */
  97         HWTSTAMP_FILTER_PTP_V2_EVENT,
  98         /* PTP v2/802.AS1, any layer, Sync packet */
  99         HWTSTAMP_FILTER_PTP_V2_SYNC,
 100         /* PTP v2/802.AS1, any layer, Delay_req packet */
 101         HWTSTAMP_FILTER_PTP_V2_DELAY_REQ,
 102 };
 103
 104 #endif /* _NET_TIMESTAMPING_H */