[PATCH v3 net-next 7/7] net: ena: Implement gettimexattrs64 callback for PTP attributes

[Arthur Kiyanovski <akiyano@amazon.com>]

Implement the gettimexattrs64 callback in the ENA driver to support
the PTP_SYS_OFFSET_EXTENDED_ATTRS ioctl.

This enables applications to retrieve PHC timestamps with quality
attributes through the standard PTP ioctl interface.

The ENA device currently reports only error_bound.
Other attributes are set to default values.

Signed-off-by: Amit Bernstein <amitbern@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_phc.c | 61 +++++++++++++++++++----
 1 file changed, 51 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_phc.c b/drivers/net/ethernet/amazon/ena/ena_phc.c
index 2bcb5af..6bfa971 100644
--- a/drivers/net/ethernet/amazon/ena/ena_phc.c
+++ b/drivers/net/ethernet/amazon/ena/ena_phc.c
@@ -25,6 +25,46 @@ static int ena_phc_feature_enable(struct ptp_clock_info *clock_info,
 	return -EOPNOTSUPP;
 }
 
+static int ena_phc_gettimexattrs64(struct ptp_clock_info *clock_info,
+				   struct timespec64 *ts,
+				   struct ptp_system_timestamp *sts,
+				   struct ptp_clock_attributes *att)
+{
+	struct ena_phc_info *phc_info =
+		container_of(clock_info, struct ena_phc_info, clock_info);
+	u32 error_bound_nsec;
+	unsigned long flags;
+	u64 timestamp_nsec;
+	int rc;
+
+	spin_lock_irqsave(&phc_info->lock, flags);
+
+	ptp_read_system_prets(sts);
+
+	rc = ena_com_phc_get_timestamp(phc_info->adapter->ena_dev,
+				       &timestamp_nsec,
+				       &error_bound_nsec);
+
+	ptp_read_system_postts(sts);
+
+	spin_unlock_irqrestore(&phc_info->lock, flags);
+
+	if (rc)
+		return rc;
+
+	*ts = ns_to_timespec64(timestamp_nsec);
+
+	if (att) {
+		att->error_bound = error_bound_nsec;
+		att->status = PTP_CLOCK_STATUS_UNKNOWN;
+		att->timescale = PTP_TIMESCALE_UNKNOWN;
+		att->counter_id = 0;
+		att->counter_value = 0;
+	}
+
+	return 0;
+}
+
 static int ena_phc_gettimex64(struct ptp_clock_info *clock_info,
 			      struct timespec64 *ts,
 			      struct ptp_system_timestamp *sts)
@@ -62,16 +102,17 @@ static int ena_phc_settime64(struct ptp_clock_info *clock_info,
 }
 
 static struct ptp_clock_info ena_ptp_clock_info = {
-	.owner		= THIS_MODULE,
-	.n_alarm	= 0,
-	.n_ext_ts	= 0,
-	.n_per_out	= 0,
-	.pps		= 0,
-	.adjtime	= ena_phc_adjtime,
-	.adjfine	= ena_phc_adjfine,
-	.gettimex64	= ena_phc_gettimex64,
-	.settime64	= ena_phc_settime64,
-	.enable		= ena_phc_feature_enable,
+	.owner		   = THIS_MODULE,
+	.n_alarm	   = 0,
+	.n_ext_ts	   = 0,
+	.n_per_out	   = 0,
+	.pps		   = 0,
+	.adjtime	   = ena_phc_adjtime,
+	.adjfine	   = ena_phc_adjfine,
+	.gettimexattrs64   = ena_phc_gettimexattrs64,
+	.gettimex64	   = ena_phc_gettimex64,
+	.settime64	   = ena_phc_settime64,
+	.enable		   = ena_phc_feature_enable,
 };
 
 /* Enable/Disable PHC by the kernel, affects on the next init flow */
-- 
2.47.3