[PATCH v2 1/3] net: ethernet: ti: am65-cpts: Enable PTP RX HW timestamp using CPTS FIFO

[Chintan Vankar]

CPTS module supports capturing timestamp for every packet it receives,
add a new function named "am65_cpts_rx_find_ts()" to get the timestamp
of received packets from CPTS FIFO.

Add another function named "am65_cpts_rx_timestamp()" which internally
calls "am65_cpts_rx_find_ts()" function and timestamps the received
PTP packets.

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

Changes from v1 to v2:
- Add skb_reset_mac_header() in am65_cpts_rx_timestamp() to configure
  skb MAC header properties for packets which are to be timestamped.

 drivers/net/ethernet/ti/am65-cpts.c | 89 +++++++++++++++++++++--------
 drivers/net/ethernet/ti/am65-cpts.h | 11 ++--
 2 files changed, 72 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpts.c b/drivers/net/ethernet/ti/am65-cpts.c
index c66618d91c28..6c1d571c5e0b 100644
--- a/drivers/net/ethernet/ti/am65-cpts.c
+++ b/drivers/net/ethernet/ti/am65-cpts.c
@@ -859,29 +859,6 @@ static long am65_cpts_ts_work(struct ptp_clock_info *ptp)
 	return delay;
 }
 
-/**
- * am65_cpts_rx_enable - enable rx timestamping
- * @cpts: cpts handle
- * @en: enable
- *
- * This functions enables rx packets timestamping. The CPTS can timestamp all
- * rx packets.
- */
-void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
-{
-	u32 val;
-
-	mutex_lock(&cpts->ptp_clk_lock);
-	val = am65_cpts_read32(cpts, control);
-	if (en)
-		val |= AM65_CPTS_CONTROL_TSTAMP_EN;
-	else
-		val &= ~AM65_CPTS_CONTROL_TSTAMP_EN;
-	am65_cpts_write32(cpts, val, control);
-	mutex_unlock(&cpts->ptp_clk_lock);
-}
-EXPORT_SYMBOL_GPL(am65_cpts_rx_enable);
-
 static int am65_skb_get_mtype_seqid(struct sk_buff *skb, u32 *mtype_seqid)
 {
 	unsigned int ptp_class = ptp_classify_raw(skb);
@@ -906,6 +883,72 @@ 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, struct sk_buff *skb,
+				int ev_type, 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_del_init(&event->list);
+			list_add(&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, AM65_CPTS_EV_RX, 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..6099d772799d 100644
--- a/drivers/net/ethernet/ti/am65-cpts.h
+++ b/drivers/net/ethernet/ti/am65-cpts.h
@@ -22,9 +22,9 @@ 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);
 u64 am65_cpts_ns_gettime(struct am65_cpts *cpts);
 int am65_cpts_estf_enable(struct am65_cpts *cpts, int idx,
 			  struct am65_cpts_estf_cfg *cfg);
@@ -48,17 +48,18 @@ static inline int am65_cpts_phc_index(struct am65_cpts *cpts)
 	return -1;
 }
 
-static inline void am65_cpts_tx_timestamp(struct am65_cpts *cpts,
+static inline void am65_cpts_rx_timestamp(struct am65_cpts *cpts,
 					  struct sk_buff *skb)
 {
 }
 
-static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
-					       struct sk_buff *skb)
+static inline void am65_cpts_tx_timestamp(struct am65_cpts *cpts,
+					  struct sk_buff *skb)
 {
 }
 
-static inline void am65_cpts_rx_enable(struct am65_cpts *cpts, bool en)
+static inline void am65_cpts_prep_tx_timestamp(struct am65_cpts *cpts,
+					       struct sk_buff *skb)
 {
 }
 
-- 
2.34.1