[PATCH ath-next 2/3] wifi: ath12k: Add timestamp to dp stats display

[Sreeramya Soratkal]

In MLO configurations the device_dp_stats debugfs file is read
separately for each ath12k device.  Without a timestamp it is impossible
to know whether two snapshots were taken at the same moment, making
counter comparisons across devices unreliable.

Prepend a ktime-based millisecond timestamp to the output header so the
reader can confirm when the snapshot was taken.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6-01243-QCAHKSWPL_SILICONZ-1

Signed-off-by: Sreeramya Soratkal <sreeramya.soratkal at oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/debugfs.c b/drivers/net/wireless/ath/ath12k/debugfs.c
index bab9d96d6acc..57c213111259 100644
--- a/drivers/net/wireless/ath/ath12k/debugfs.c
+++ b/drivers/net/wireless/ath/ath12k/debugfs.c
@@ -1082,6 +1082,9 @@ static ssize_t ath12k_debugfs_dump_device_dp_stats(struct file *file,
 	if (!buf)
 		return -ENOMEM;
 
+	len += scnprintf(buf + len, size - len,
+			 "DEVICE DP STATS (timestamp: %lldms):\n\n",
+			 ktime_to_ms(ktime_get()));
 	len += scnprintf(buf + len, size - len, "DEVICE RX STATS:\n\n");
 	len += scnprintf(buf + len, size - len, "err ring pkts: %u\n",
 			 device_stats->err_ring_pkts);
-- 
2.34.1