netdev - [PATCH v2 net-next 1/3] net: add DEV_STATS

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Message-ID: <20230921085218.954120-2-edumazet@google.com>
Date: Thu, 21 Sep 2023 08:52:16 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <simon.horman@...igine.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 1/3] net: add DEV_STATS_READ() helper

Companion of DEV_STATS_INC() & DEV_STATS_ADD().

This is going to be used in the series.

Use it in macsec_get_stats64().

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/macsec.c      | 6 +++---
 include/linux/netdevice.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index b7e151439c4886f851ba87e27a34e33cd834069a..7a44e1cbe30558dafcc2bc1a6ee47faad2e60d15 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3655,9 +3655,9 @@ static void macsec_get_stats64(struct net_device *dev,
 
 	dev_fetch_sw_netstats(s, dev->tstats);
 
-	s->rx_dropped = atomic_long_read(&dev->stats.__rx_dropped);
-	s->tx_dropped = atomic_long_read(&dev->stats.__tx_dropped);
-	s->rx_errors = atomic_long_read(&dev->stats.__rx_errors);
+	s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
+	s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
+	s->rx_errors = DEV_STATS_READ(dev, rx_errors);
 }
 
 static int macsec_get_iflink(const struct net_device *dev)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7e520c14eb8c68cf2e3821c86c7c3d1f0d8ab226..e070a4540fbaf4a9cf310d5f53c4401840c72776 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -5236,5 +5236,6 @@ extern struct net_device *blackhole_netdev;
 #define DEV_STATS_INC(DEV, FIELD) atomic_long_inc(&(DEV)->stats.__##FIELD)
 #define DEV_STATS_ADD(DEV, FIELD, VAL) 	\
 		atomic_long_add((VAL), &(DEV)->stats.__##FIELD)
+#define DEV_STATS_READ(DEV, FIELD) atomic_long_read(&(DEV)->stats.__##FIELD)
 
 #endif	/* _LINUX_NETDEVICE_H */
-- 
2.42.0.459.ge4e396fd5e-goog