net: lan966x: Update extraction/injection for timestamping

Update both the extraction and injection to do timestamping of the
frames. The extraction is always doing the timestamping while for
injection is doing the timestamping only if it is configured.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 141 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
index a92a16b728b2..11c9f9d3aa5b 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
@@ -107,6 +107,103 @@ int lan966x_ptp_hwtstamp_get(struct lan966x_port *port, struct ifreq *ifr)
 			    sizeof(phc->hwtstamp_config)) ? -EFAULT : 0;
 }
 
+static int lan966x_ptp_classify(struct lan966x_port *port, struct sk_buff *skb)
+{
+	struct ptp_header *header;
+	u8 msgtype;
+	int type;
+
+	if (port->ptp_cmd == IFH_REW_OP_NOOP)
+		return IFH_REW_OP_NOOP;
+
+	type = ptp_classify_raw(skb);
+	if (type == PTP_CLASS_NONE)
+		return IFH_REW_OP_NOOP;
+
+	header = ptp_parse_header(skb, type);
+	if (!header)
+		return IFH_REW_OP_NOOP;
+
+	if (port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP)
+		return IFH_REW_OP_TWO_STEP_PTP;
+
+	/* If it is sync and run 1 step then set the correct operation,
+	 * otherwise run as 2 step
+	 */
+	msgtype = ptp_get_msgtype(header, type);
+	if ((msgtype & 0xf) == 0)
+		return IFH_REW_OP_ONE_STEP_PTP;
+
+	return IFH_REW_OP_TWO_STEP_PTP;
+}
+
+static void lan966x_ptp_txtstamp_old_release(struct lan966x_port *port)
+{
+	struct sk_buff *skb, *skb_tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->tx_skbs.lock, flags);
+	skb_queue_walk_safe(&port->tx_skbs, skb, skb_tmp) {
+		if time_after(LAN966X_SKB_CB(skb)->jiffies + LAN966X_PTP_TIMEOUT,
+			      jiffies)
+			break;
+
+		__skb_unlink(skb, &port->tx_skbs);
+		dev_kfree_skb_any(skb);
+	}
+	spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
+}
+
+int lan966x_ptp_txtstamp_request(struct lan966x_port *port,
+				 struct sk_buff *skb)
+{
+	struct lan966x *lan966x = port->lan966x;
+	unsigned long flags;
+	u8 rew_op;
+
+	rew_op = lan966x_ptp_classify(port, skb);
+	LAN966X_SKB_CB(skb)->rew_op = rew_op;
+
+	if (rew_op != IFH_REW_OP_TWO_STEP_PTP)
+		return 0;
+
+	lan966x_ptp_txtstamp_old_release(port);
+
+	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
+	if (lan966x->ptp_skbs == LAN966X_MAX_PTP_ID) {
+		spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+		return -EBUSY;
+	}
+
+	skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+
+	skb_queue_tail(&port->tx_skbs, skb);
+	LAN966X_SKB_CB(skb)->ts_id = port->ts_id;
+	LAN966X_SKB_CB(skb)->jiffies = jiffies;
+
+	lan966x->ptp_skbs++;
+	port->ts_id++;
+	if (port->ts_id == LAN966X_MAX_PTP_ID)
+		port->ts_id = 0;
+
+	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+
+	return 0;
+}
+
+void lan966x_ptp_txtstamp_release(struct lan966x_port *port,
+				  struct sk_buff *skb)
+{
+	struct lan966x *lan966x = port->lan966x;
+	unsigned long flags;
+
+	spin_lock_irqsave(&lan966x->ptp_ts_id_lock, flags);
+	port->ts_id--;
+	lan966x->ptp_skbs--;
+	skb_unlink(skb, &port->tx_skbs);
+	spin_unlock_irqrestore(&lan966x->ptp_ts_id_lock, flags);
+}
+
 static int lan966x_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
 {
 	struct lan966x_phc *phc = container_of(ptp, struct lan966x_phc, info);
@@ -312,6 +409,7 @@ static int lan966x_ptp_phc_init(struct lan966x *lan966x,
 int lan966x_ptp_init(struct lan966x *lan966x)
 {
 	u64 tod_adj = lan966x_ptp_get_nominal_value();
+	struct lan966x_port *port;
 	int err, i;
 
 	if (!lan966x->ptp)
@@ -324,6 +422,7 @@ int lan966x_ptp_init(struct lan966x *lan966x)
 	}
 
 	spin_lock_init(&lan966x->ptp_clock_lock);
+	spin_lock_init(&lan966x->ptp_ts_id_lock);
 	mutex_init(&lan966x->ptp_lock);
 
 	/* Disable master counters */
@@ -348,13 +447,55 @@ int lan966x_ptp_init(struct lan966x *lan966x)
 	/* Enable master counters */
 	lan_wr(PTP_DOM_CFG_ENA_SET(0x7), lan966x, PTP_DOM_CFG);
 
+	for (i = 0; i < lan966x->num_phys_ports; i++) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		skb_queue_head_init(&port->tx_skbs);
+	}
+
 	return 0;
 }
 
 void lan966x_ptp_deinit(struct lan966x *lan966x)
 {
+	struct lan966x_port *port;
 	int i;
 
+	for (i = 0; i < lan966x->num_phys_ports; i++) {
+		port = lan966x->ports[i];
+		if (!port)
+			continue;
+
+		skb_queue_purge(&port->tx_skbs);
+	}
+
 	for (i = 0; i < LAN966X_PHC_COUNT; ++i)
 		ptp_clock_unregister(lan966x->phc[i].clock);
 }
+
+void lan966x_ptp_rxtstamp(struct lan966x *lan966x, struct sk_buff *skb,
+			  u64 timestamp)
+{
+	struct skb_shared_hwtstamps *shhwtstamps;
+	struct lan966x_phc *phc;
+	struct timespec64 ts;
+	u64 full_ts_in_ns;
+
+	if (!lan966x->ptp)
+		return;
+
+	phc = &lan966x->phc[LAN966X_PHC_PORT];
+	lan966x_ptp_gettime64(&phc->info, &ts);
+
+	/* Drop the sub-ns precision */
+	timestamp = timestamp >> 2;
+	if (ts.tv_nsec < timestamp)
+		ts.tv_sec--;
+	ts.tv_nsec = timestamp;
+	full_ts_in_ns = ktime_set(ts.tv_sec, ts.tv_nsec);
+
+	shhwtstamps = skb_hwtstamps(skb);
+	shhwtstamps->hwtstamp = full_ts_in_ns;
+}