[PATCH net-next v2 3/4] net: add dev_dstats_rx_dropped_add() helper

[Breno Leitao]

Introduce the dev_dstats_rx_dropped_add() helper to allow incrementing
the rx_drops per-CPU statistic by an arbitrary value, rather than just
one. This is useful for drivers or code paths that need to account for
multiple dropped packets at once, such as when dropping entire queues.

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
 include/linux/netdevice.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index adb14db257984..2e9100468e1af 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3016,6 +3016,16 @@ static inline void dev_dstats_rx_dropped(struct net_device *dev)
 	u64_stats_update_end(&dstats->syncp);
 }
 
+static inline void dev_dstats_rx_dropped_add(struct net_device *dev,
+					     unsigned int packets)
+{
+	struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
+
+	u64_stats_update_begin(&dstats->syncp);
+	u64_stats_add(&dstats->rx_drops, packets);
+	u64_stats_update_end(&dstats->syncp);
+}
+
 static inline void dev_dstats_tx_add(struct net_device *dev,
 				     unsigned int len)
 {

-- 
2.47.1