[PATCH v9 net-next 6/8] net: ena: View PHC stats using debugfs

[David Arinzon <darinzon@amazon.com>]

Add an entry named `phc_stats` to view the PHC statistics.
If PHC is enabled, the stats are printed, as below:

phc_cnt: 0
phc_exp: 0
phc_skp: 0
phc_err_dv: 0
phc_err_ts: 0

If PHC is disabled, no statistics will be displayed.

Signed-off-by: David Arinzon <darinzon@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_debugfs.c | 39 ++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_debugfs.c b/drivers/net/ethernet/amazon/ena/ena_debugfs.c
index fea7bb7f..c7de13f1 100644
--- a/drivers/net/ethernet/amazon/ena/ena_debugfs.c
+++ b/drivers/net/ethernet/amazon/ena/ena_debugfs.c
@@ -8,6 +8,35 @@
 #include <linux/seq_file.h>
 #include <linux/pci.h>
 #include "ena_debugfs.h"
+#include "ena_phc.h"
+
+static int phc_stats_show(struct seq_file *file, void *priv)
+{
+	struct ena_adapter *adapter = file->private;
+
+	if (!ena_phc_is_active(adapter))
+		return 0;
+
+	seq_printf(file,
+		   "phc_cnt: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_cnt);
+	seq_printf(file,
+		   "phc_exp: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_exp);
+	seq_printf(file,
+		   "phc_skp: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_skp);
+	seq_printf(file,
+		   "phc_err_dv: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_err_dv);
+	seq_printf(file,
+		   "phc_err_ts: %llu\n",
+		   adapter->ena_dev->phc.stats.phc_err_ts);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(phc_stats);
 
 void ena_debugfs_init(struct net_device *dev)
 {
@@ -15,8 +44,16 @@ void ena_debugfs_init(struct net_device *dev)
 
 	adapter->debugfs_base =
 		debugfs_create_dir(dev_name(&adapter->pdev->dev), NULL);
-	if (IS_ERR(adapter->debugfs_base))
+	if (IS_ERR(adapter->debugfs_base)) {
 		netdev_err(dev, "Failed to create debugfs dir\n");
+		return;
+	}
+
+	debugfs_create_file("phc_stats",
+			    0400,
+			    adapter->debugfs_base,
+			    adapter,
+			    &phc_stats_fops);
 }
 
 void ena_debugfs_terminate(struct net_device *dev)
-- 
2.47.1