1 files changed, 31 insertions, 19 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
index 928f38792203..885faaa7b9de 100644
--- a/drivers/net/ethernet/intel/igc/igc_ptp.c
+++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
@@ -459,12 +459,10 @@ static int igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
 /**
  * igc_ptp_rx_pktstamp - Retrieve timestamp from Rx packet buffer
  * @adapter: Pointer to adapter the packet buffer belongs to
- * @buf: Pointer to packet buffer
+ * @buf: Pointer to start of timestamp in HW format (2 32-bit words)
  *
- * This function retrieves the timestamp saved in the beginning of packet
- * buffer. While two timestamps are available, one in timer0 reference and the
- * other in timer1 reference, this function considers only the timestamp in
- * timer0 reference.
+ * This function retrieves and converts the timestamp stored at @buf
+ * to ktime_t, adjusting for hardware latencies.
  *
  * Returns timestamp value.
  */
@@ -474,17 +472,8 @@ ktime_t igc_ptp_rx_pktstamp(struct igc_adapter *adapter, __le32 *buf)
 	u32 secs, nsecs;
 	int adjust;
 
-	/* Timestamps are saved in little endian at the beginning of the packet
-	 * buffer following the layout:
-	 *
-	 * DWORD: | 0              | 1              | 2              | 3              |
-	 * Field: | Timer1 SYSTIML | Timer1 SYSTIMH | Timer0 SYSTIML | Timer0 SYSTIMH |
-	 *
-	 * SYSTIML holds the nanoseconds part while SYSTIMH holds the seconds
-	 * part of the timestamp.
-	 */
-	nsecs = le32_to_cpu(buf[2]);
-	secs = le32_to_cpu(buf[3]);
+	nsecs = le32_to_cpu(buf[0]);
+	secs = le32_to_cpu(buf[1]);
 
 	timestamp = ktime_set(secs, nsecs);
 
@@ -542,10 +531,11 @@ static void igc_ptp_enable_rx_timestamp(struct igc_adapter *adapter)
 
 	for (i = 0; i < adapter->num_rx_queues; i++) {
 		val = rd32(IGC_SRRCTL(i));
-		/* FIXME: For now, only support retrieving RX timestamps from
-		 * timer 0.
+		/* Enable retrieving timestamps from timer 0, the
+		 * "adjustable clock" and timer 1 the "free running
+		 * clock".
 		 */
-		val |= IGC_SRRCTL_TIMER1SEL(0) | IGC_SRRCTL_TIMER0SEL(0) |
+		val |= IGC_SRRCTL_TIMER1SEL(1) | IGC_SRRCTL_TIMER0SEL(0) |
 		       IGC_SRRCTL_TIMESTAMP;
 		wr32(IGC_SRRCTL(i), val);
 	}
@@ -1035,6 +1025,26 @@ static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp,
 					     adapter, &adapter->snapshot, cts);
 }
 
+static int igc_ptp_getcyclesx64(struct ptp_clock_info *ptp,
+				struct timespec64 *ts,
+				struct ptp_system_timestamp *sts)
+{
+	struct igc_adapter *igc = container_of(ptp, struct igc_adapter, ptp_caps);
+	struct igc_hw *hw = &igc->hw;
+	unsigned long flags;
+
+	spin_lock_irqsave(&igc->free_timer_lock, flags);
+
+	ptp_read_system_prets(sts);
+	ts->tv_nsec = rd32(IGC_SYSTIML_1);
+	ts->tv_sec = rd32(IGC_SYSTIMH_1);
+	ptp_read_system_postts(sts);
+
+	spin_unlock_irqrestore(&igc->free_timer_lock, flags);
+
+	return 0;
+}
+
 /**
  * igc_ptp_init - Initialize PTP functionality
  * @adapter: Board private structure
@@ -1088,6 +1098,7 @@ void igc_ptp_init(struct igc_adapter *adapter)
 		adapter->ptp_caps.adjfine = igc_ptp_adjfine_i225;
 		adapter->ptp_caps.adjtime = igc_ptp_adjtime_i225;
 		adapter->ptp_caps.gettimex64 = igc_ptp_gettimex64_i225;
+		adapter->ptp_caps.getcyclesx64 = igc_ptp_getcyclesx64;
 		adapter->ptp_caps.settime64 = igc_ptp_settime_i225;
 		adapter->ptp_caps.enable = igc_ptp_feature_enable_i225;
 		adapter->ptp_caps.pps = 1;
@@ -1108,6 +1119,7 @@ void igc_ptp_init(struct igc_adapter *adapter)
 	}
 
 	spin_lock_init(&adapter->ptp_tx_lock);
+	spin_lock_init(&adapter->free_timer_lock);
 	spin_lock_init(&adapter->tmreg_lock);
 
 	adapter->tstamp_config.rx_filter = HWTSTAMP_FILTER_NONE;