/* * PTP 1588 clock support - support for timestamping in PHY devices * * Copyright (C) 2010 OMICRON electronics GmbH * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */#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->drv))		return ptp_classify_raw(skb);	else		return PTP_CLASS_NONE;} void skb_clone_tx_timestamp(struct sk_buff *skb){	struct phy_device *phydev;	struct sk_buff *clone;	unsigned int type; 	if (!skb->sk)		return; 	type = classify(skb);	if (type == PTP_CLASS_NONE)		return; 	phydev = skb->dev->phydev;	if (likely(phydev->drv->txtstamp)) {		clone = skb_clone_sk(skb);		if (!clone)			return;		phydev->drv->txtstamp(phydev, clone, type);	}}EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp); bool skb_defer_rx_timestamp(struct sk_buff *skb){	struct phy_device *phydev;	unsigned int type; 	if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->drv)		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; 	phydev = skb->dev->phydev;	if (likely(phydev->drv->rxtstamp))		return phydev->drv->rxtstamp(phydev, skb, type); 	return false;}EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);