netdev - [PATCH net-next] ionic: add support for ethtool extended stat link_down

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Date: Fri, 2 Jun 2023 10:32:52 -0700
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC: <brett.creeley@....com>, <drivers@...sando.io>, Nitya Sunkad
	<nitya.sunkad@....com>, Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH net-next] ionic: add support for ethtool extended stat link_down_count

From: Nitya Sunkad <nitya.sunkad@....com>

Following the example of 9a0f830f8026 ("ethtool: linkstate: add a statistic
for PHY down events"), added support for link down events.

Added callback ionic_get_link_ext_stats to ionic_ethtool.c to support
link_down_count, a property of netdev that gets incremented every time
the device link goes down.

Run ethtool -I <devname> to display the device link down count.

Signed-off-by: Nitya Sunkad <nitya.sunkad@....com>
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/net/ethernet/pensando/ionic/ionic_ethtool.c | 9 +++++++++
 drivers/net/ethernet/pensando/ionic/ionic_lif.c     | 1 +
 drivers/net/ethernet/pensando/ionic/ionic_lif.h     | 1 +
 3 files changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index 9b2b96fa36af..4c527a06e7d9 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -104,6 +104,14 @@ static void ionic_get_regs(struct net_device *netdev, struct ethtool_regs *regs,
 	memcpy_fromio(p + offset, lif->ionic->idev.dev_cmd_regs->words, size);
 }
 
+static void ionic_get_link_ext_stats(struct net_device *netdev,
+				     struct ethtool_link_ext_stats *stats)
+{
+	struct ionic_lif *lif = netdev_priv(netdev);
+
+	stats->link_down_events = lif->link_down_count;
+}
+
 static int ionic_get_link_ksettings(struct net_device *netdev,
 				    struct ethtool_link_ksettings *ks)
 {
@@ -1074,6 +1082,7 @@ static const struct ethtool_ops ionic_ethtool_ops = {
 	.get_regs_len		= ionic_get_regs_len,
 	.get_regs		= ionic_get_regs,
 	.get_link		= ethtool_op_get_link,
+	.get_link_ext_stats	= ionic_get_link_ext_stats,
 	.get_link_ksettings	= ionic_get_link_ksettings,
 	.set_link_ksettings	= ionic_set_link_ksettings,
 	.get_coalesce		= ionic_get_coalesce,
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 957027e546b3..6ccc1ea91992 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -168,6 +168,7 @@ static void ionic_link_status_check(struct ionic_lif *lif)
 		}
 	} else {
 		if (netif_carrier_ok(netdev)) {
+			lif->link_down_count++;
 			netdev_info(netdev, "Link down\n");
 			netif_carrier_off(netdev);
 		}
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index c9c4c46d5a16..fd2ea670e7d8 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -201,6 +201,7 @@ struct ionic_lif {
 	u64 hw_features;
 	bool registered;
 	u16 lif_type;
+	unsigned int link_down_count;
 	unsigned int nmcast;
 	unsigned int nucast;
 	unsigned int nvlans;
-- 
2.17.1