1 files changed, 71 insertions, 0 deletions
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
new file mode 100644
index 000000000..04840697f
--- /dev/null
+++ b/net/core/timestamping.c
@@ -0,0 +1,71 @@
+// 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);