netdev - [PATCH net-next 04/11] i40e: add link_down

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250609212652.1138933-5-anthony.l.nguyen@intel.com>
Date: Mon,  9 Jun 2025 14:26:43 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	andrew+netdev@...n.ch,
	netdev@...r.kernel.org
Cc: Dawid Osuchowski <dawid.osuchowski@...ux.intel.com>,
	anthony.l.nguyen@...el.com,
	Martyna Szapar-Mudlaw <martyna.szapar-mudlaw@...ux.intel.com>,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	Simon Horman <horms@...nel.org>,
	Rinitha S <sx.rinitha@...el.com>
Subject: [PATCH net-next 04/11] i40e: add link_down_events statistic

From: Dawid Osuchowski <dawid.osuchowski@...ux.intel.com>

Introduce a link_down_events counter to the i40e driver, incremented
each time the link transitions from up to down.
This counter can help diagnose issues related to link stability,
such as port flapping or unexpected link drops.

The value is exposed via ethtool's get_link_ext_stats() interface.

Co-developed-by: Martyna Szapar-Mudlaw <martyna.szapar-mudlaw@...ux.intel.com>
Signed-off-by: Martyna Szapar-Mudlaw <martyna.szapar-mudlaw@...ux.intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Dawid Osuchowski <dawid.osuchowski@...ux.intel.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Tested-by: Rinitha S <sx.rinitha@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e.h         |  1 +
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 10 ++++++++++
 drivers/net/ethernet/intel/i40e/i40e_main.c    |  3 +++
 3 files changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index c67963bfe14e..54d5fdc303ca 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -548,6 +548,7 @@ struct i40e_pf {
 	u16 empr_count; /* EMP reset count */
 	u16 pfr_count; /* PF reset count */
 	u16 sw_int_count; /* SW interrupt count */
+	u32 link_down_events;
 
 	struct mutex switch_mutex;
 	u16 lan_vsi;       /* our default LAN VSI */
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 814e20325feb..c7f2d85eafcd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -2750,6 +2750,15 @@ static void i40e_diag_test(struct net_device *netdev,
 	netif_info(pf, drv, netdev, "testing failed\n");
 }
 
+static void i40e_get_link_ext_stats(struct net_device *netdev,
+				    struct ethtool_link_ext_stats *stats)
+{
+	struct i40e_netdev_priv *np = netdev_priv(netdev);
+	struct i40e_pf *pf = np->vsi->back;
+
+	stats->link_down_events = pf->link_down_events;
+}
+
 static void i40e_get_wol(struct net_device *netdev,
 			 struct ethtool_wolinfo *wol)
 {
@@ -5810,6 +5819,7 @@ static const struct ethtool_ops i40e_ethtool_ops = {
 	.get_regs		= i40e_get_regs,
 	.nway_reset		= i40e_nway_reset,
 	.get_link		= ethtool_op_get_link,
+	.get_link_ext_stats	= i40e_get_link_ext_stats,
 	.get_wol		= i40e_get_wol,
 	.set_wol		= i40e_set_wol,
 	.set_eeprom		= i40e_set_eeprom,
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 67faf5a8dcbf..fcfa2162a3dd 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9960,6 +9960,9 @@ static void i40e_link_event(struct i40e_pf *pf)
 	     new_link == netif_carrier_ok(vsi->netdev)))
 		return;
 
+	if (!new_link && old_link)
+		pf->link_down_events++;
+
 	i40e_print_link_message(vsi, new_link);
 
 	/* Notify the base of the switch tree connected to
-- 
2.47.1