LXR linux/net/core/timestamping.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * PTP 1588 clock support - support for timestamping in PHY devices
   4 *
   5 * Copyright (C) 2010 OMICRON electronics GmbH
   6 */
   7#include <linux/errqueue.h>
   8#include <linux/phy.h>
   9#include <linux/ptp_classify.h>
  10#include <linux/skbuff.h>
  11#include <linux/export.h>
  12
  13static unsigned int classify(const struct sk_buff *skb)
  14{
  15        if (likely(skb->dev && skb->dev->phydev &&
  16                   skb->dev->phydev->mii_ts))
  17                return ptp_classify_raw(skb);
  18        else
  19                return PTP_CLASS_NONE;
  20}
  21
  22void skb_clone_tx_timestamp(struct sk_buff *skb)
  23{
  24        struct mii_timestamper *mii_ts;
  25        struct sk_buff *clone;
  26        unsigned int type;
  27
  28        if (!skb->sk)
  29                return;
  30
  31        type = classify(skb);
  32        if (type == PTP_CLASS_NONE)
  33                return;
  34
  35        mii_ts = skb->dev->phydev->mii_ts;
  36        if (likely(mii_ts->txtstamp)) {
  37                clone = skb_clone_sk(skb);
  38                if (!clone)
  39                        return;
  40                mii_ts->txtstamp(mii_ts, clone, type);
  41        }
  42}
  43EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
  44
  45bool skb_defer_rx_timestamp(struct sk_buff *skb)
  46{
  47        struct mii_timestamper *mii_ts;
  48        unsigned int type;
  49
  50        if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->mii_ts)
  51                return false;
  52
  53        if (skb_headroom(skb) < ETH_HLEN)
  54                return false;
  55
  56        __skb_push(skb, ETH_HLEN);
  57
  58        type = ptp_classify_raw(skb);
  59
  60        __skb_pull(skb, ETH_HLEN);
  61
  62        if (type == PTP_CLASS_NONE)
  63                return false;
  64
  65        mii_ts = skb->dev->phydev->mii_ts;
  66        if (likely(mii_ts->rxtstamp))
  67                return mii_ts->rxtstamp(mii_ts, skb, type);
  68
  69        return false;
  70}
  71EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
  72