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// 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>
#include <linux/ptp_clock_kernel.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 hwtstamp_provider *hwprov;
struct mii_timestamper *mii_ts;
struct phy_device *phydev;
struct sk_buff *clone;
unsigned int type;
if (!skb->sk || !skb->dev)
return;
rcu_read_lock();
hwprov = rcu_dereference(skb->dev->hwprov);
if (hwprov) {
if (hwprov->source != HWTSTAMP_SOURCE_PHYLIB ||
!hwprov->phydev) {
rcu_read_unlock();
return;
}
phydev = hwprov->phydev;
} else {
phydev = skb->dev->phydev;
if (!phy_is_default_hwtstamp(phydev)) {
rcu_read_unlock();
return;
}
}
rcu_read_unlock();
type = classify(skb);
if (type == PTP_CLASS_NONE)
return;
mii_ts = 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 hwtstamp_provider *hwprov;
struct mii_timestamper *mii_ts;
struct phy_device *phydev;
unsigned int type;
if (!skb->dev)
return false;
rcu_read_lock();
hwprov = rcu_dereference(skb->dev->hwprov);
if (hwprov) {
if (hwprov->source != HWTSTAMP_SOURCE_PHYLIB ||
!hwprov->phydev) {
rcu_read_unlock();
return false;
}
phydev = hwprov->phydev;
} else {
phydev = skb->dev->phydev;
if (!phy_is_default_hwtstamp(phydev)) {
rcu_read_unlock();
return false;
}
}
rcu_read_unlock();
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 = 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);
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