// SPDX-License-Identifier: GPL-2.0-or-later/* * PTP 1588 clock support - support for timestamping in PHY devices * * Copyright (C) 2010 OMICRON electronics GmbH */#include <linux/errqueue.h>#include <linux/phy.h>#include <linux/ptp_classify.h>#include <linux/skbuff.h>#include <linux/export.h> static unsigned int classify(const struct sk_buff *skb){	if (likely(skb->dev && skb->dev->phydev &&		   skb->dev->phydev->mii_ts))		return ptp_classify_raw(skb);	else		return PTP_CLASS_NONE;} void skb_clone_tx_timestamp(struct sk_buff *skb){	struct mii_timestamper *mii_ts;	struct sk_buff *clone;	unsigned int type; 	if (!skb->sk)		return; 	type = classify(skb);	if (type == PTP_CLASS_NONE)		return; 	mii_ts = skb->dev->phydev->mii_ts;	if (likely(mii_ts->txtstamp)) {		clone = skb_clone_sk(skb);		if (!clone)			return;		mii_ts->txtstamp(mii_ts, clone, type);	}}EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp); bool skb_defer_rx_timestamp(struct sk_buff *skb){	struct mii_timestamper *mii_ts;	unsigned int type; 	if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->mii_ts)		return false; 	if (skb_headroom(skb) < ETH_HLEN)		return false; 	__skb_push(skb, ETH_HLEN); 	type = ptp_classify_raw(skb); 	__skb_pull(skb, ETH_HLEN); 	if (type == PTP_CLASS_NONE)		return false; 	mii_ts = skb->dev->phydev->mii_ts;	if (likely(mii_ts->rxtstamp))		return mii_ts->rxtstamp(mii_ts, skb, type); 	return false;}EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);