linux-kernel - [PATCH net 2/2] eth: fbnic: Lock the tx

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Message-ID: <20250802024636.679317-3-mohsin.bashr@gmail.com>
Date: Fri,  1 Aug 2025 19:46:36 -0700
From: Mohsin Bashir <mohsin.bashr@...il.com>
To: netdev@...r.kernel.org
Cc: alexanderduyck@...com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	horms@...nel.org,
	kernel-team@...a.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	mohsin.bashr@...il.com,
	pabeni@...hat.com,
	sdf@...ichev.me,
	vadim.fedorenko@...ux.dev
Subject: [PATCH net 2/2] eth: fbnic: Lock the tx_dropped update

Wrap copying of drop stats on TX path from fbd->hw_stats by the
hw_stats_lock. Currently, it is being performed outside the lock and
another thread accessing fbd->hw_stats can lead to inconsistencies.

Fixes: 5f8bd2ce8269 ("eth: fbnic: add support for TMI stats")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Mohsin Bashir <mohsin.bashr@...il.com>
---
 drivers/net/ethernet/meta/fbnic/fbnic_netdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
index dc295e1b8516..d0e381ad7bee 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
@@ -421,10 +421,12 @@ static void fbnic_get_stats64(struct net_device *dev,
 	tx_dropped = stats->dropped;
 
 	/* Record drops from Tx HW Datapath */
+	spin_lock(&fbd->hw_stats_lock);
 	tx_dropped += fbd->hw_stats.tmi.drop.frames.value +
 		      fbd->hw_stats.tti.cm_drop.frames.value +
 		      fbd->hw_stats.tti.frame_drop.frames.value +
 		      fbd->hw_stats.tti.tbi_drop.frames.value;
+	spin_unlock(&fbd->hw_stats_lock);
 
 	stats64->tx_bytes = tx_bytes;
 	stats64->tx_packets = tx_packets;
-- 
2.47.3