netdev - [PATCH net-next v5 1/2] net: ethernet: ti: am65-cpts: Enable RX HW timestamp for PTP packets using CPTS FIFO

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Message-ID: <20240402114405.219100-2-c-vankar@ti.com>
Date: Tue, 2 Apr 2024 17:14:04 +0530
From: Chintan Vankar <c-vankar@...com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
        Siddharth Vadapalli
	<s-vadapalli@...com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Chintan Vankar
	<c-vankar@...com>, Andrew Lunn <andrew@...n.ch>,
        Roger Quadros
	<rogerq@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Paolo Abeni
	<pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet
	<edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH net-next v5 1/2] net: ethernet: ti: am65-cpts: Enable RX HW timestamp for PTP packets using CPTS FIFO

Add a new function "am65_cpts_rx_timestamp()" which checks for PTP
packets from header and timestamps them.

Add another function "am65_cpts_find_rx_ts()" which finds CPTS FIFO
Event to get the timestamp of received PTP packet.

Signed-off-by: Chintan Vankar <c-vankar@...com>
---

Link to v4:
https://lore.kernel.org/r/20240327054234.1906957-1-c-vankar@ti.com/

Changes from v4 to v5:
- Updated commit message.
- Replaced "list_del_entry()" and "list_add()" functions with equivalent
  "list_move()" function.

 drivers/net/ethernet/ti/am65-cpts.c | 64 +++++++++++++++++++++++++++++
 drivers/net/ethernet/ti/am65-cpts.h |  6 +++
 2 files changed, 70 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
index c66618d91c28..bc0bfda1db12 100644
--- a/drivers/net/ethernet/ti/am65-cpts.c
+++ b/drivers/net/ethernet/ti/am65-cpts.c
@@ -906,6 +906,70 @@ static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
 	return 1;
 }
 
+static u64 am65_cpts_find_rx_ts(struct am65_cpts *cpts, u32 skb_mtype_seqid)
+{
+	struct list_head *this, *next;
+	struct am65_cpts_event *event;
+	unsigned long flags;
+	u32 mtype_seqid;
+	u64 ns = 0;
+
+	am65_cpts_fifo_read(cpts);
+	spin_lock_irqsave(&cpts->lock, flags);
+	list_for_each_safe(this, next, &cpts->events) {
+		event = list_entry(this, struct am65_cpts_event, list);
+		if (time_after(jiffies, event->tmo)) {
+			list_del_init(&event->list);
+			list_add(&event->list, &cpts->pool);
+			continue;
+		}
+
+		mtype_seqid = event->event1 &
+			      (AM65_CPTS_EVENT_1_MESSAGE_TYPE_MASK |
+			       AM65_CPTS_EVENT_1_SEQUENCE_ID_MASK |
+			       AM65_CPTS_EVENT_1_EVENT_TYPE_MASK);
+
+		if (mtype_seqid == skb_mtype_seqid) {
+			ns = event->timestamp;
+			list_move(&event->list, &cpts->pool);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&cpts->lock, flags);
+
+	return ns;
+}
+
+void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb)
+{
+	struct am65_cpts_skb_cb_data *skb_cb = (struct am65_cpts_skb_cb_data *)skb->cb;
+	struct skb_shared_hwtstamps *ssh;
+	int ret;
+	u64 ns;
+
+	/* am65_cpts_rx_timestamp() is called before eth_type_trans(), so
+	 * skb MAC Hdr properties are not configured yet. Hence need to
+	 * reset skb MAC header here
+	 */
+	skb_reset_mac_header(skb);
+	ret = am65_skb_get_mtype_seqid(skb, &skb_cb->skb_mtype_seqid);
+	if (!ret)
+		return; /* if not PTP class packet */
+
+	skb_cb->skb_mtype_seqid |= (AM65_CPTS_EV_RX << AM65_CPTS_EVENT_1_EVENT_TYPE_SHIFT);
+
+	dev_dbg(cpts->dev, "%s mtype seqid %08x\n", __func__, skb_cb->skb_mtype_seqid);
+
+	ns = am65_cpts_find_rx_ts(cpts, skb_cb->skb_mtype_seqid);
+	if (!ns)
+		return;
+
+	ssh = skb_hwtstamps(skb);
+	memset(ssh, 0, sizeof(*ssh));
+	ssh->hwtstamp = ns_to_ktime(ns);
+}
+EXPORT_SYMBOL_GPL(am65_cpts_rx_timestamp);
+
 /**
  * am65_cpts_tx_timestamp - save tx packet for timestamping
  * @cpts: cpts handle
diff --git a/drivers/net/ethernet/ti/am65-cpts.h b/drivers/net/ethernet/ti/am65-cpts.h
index 6e14df0be113..90296968a75c 100644
--- a/drivers/net/ethernet/ti/am65-cpts.h
+++ b/drivers/net/ethernet/ti/am65-cpts.h
@@ -22,6 +22,7 @@ void am65_cpts_release(struct am65_cpts *cpts);
 struct am65_cpts *am65_cpts_create(struct device *dev, void __iomem *regs,
 				   struct device_node *node);
 int am65_cpts_phc_index(struct am65_cpts *cpts);
+void am65_cpts_rx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
 void am65_cpts_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
 void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts, struct sk_buff *skb);
 void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en);
@@ -48,6 +49,11 @@ static inline int am65_cpts_phc_index(struct am65_cpts *cpts)
 	return -1;
 }
 
+static inline void am65_cpts_rx_timestamp(struct am65_cpts *cpts,
+					  struct sk_buff *skb)
+{
+}
+
 static inline void am65_cpts_tx_timestamp(struct am65_cpts *cpts,
 					  struct sk_buff *skb)
 {
-- 
2.34.1