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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index b7e151439c4886f851ba87e27a34e33cd834069a..7a44e1cbe30558dafcc2bc1a6ee47faad2e60d15 100644 (file)
--- 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 (file)
--- 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 */