net: add dev_txq_stats_fold() helper

Some drivers ndo_get_stats() method need to perform txqueue stats folding.

Move folding from dev_get_stats() to a new dev_txq_stats_fold() function

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7043f85..c8fa462 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1941,6 +1941,7 @@ extern void               netdev_features_change(struct net_device *dev);
 extern void            dev_load(struct net *net, const char *name);
 extern void            dev_mcast_init(void);
 extern const struct net_device_stats *dev_get_stats(struct net_device *dev);
+extern void            dev_txq_stats_fold(const struct net_device *dev, struct net_device_stats *stats);
 
 extern int             netdev_max_backlog;
 extern int             weight_p;

diff --git a/net/core/dev.c b/net/core/dev.c
index d867522..c3e0578 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5169,6 +5169,32 @@ void netdev_run_todo(void)
 }
 
 /**
+ *     dev_txq_stats_fold - fold tx_queues stats
+ *     @dev: device to get statistics from
+ *     @stats: struct net_device_stats to hold results
+ */
+void dev_txq_stats_fold(const struct net_device *dev,
+                       struct net_device_stats *stats)
+{
+       unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
+       unsigned int i;
+       struct netdev_queue *txq;
+
+       for (i = 0; i < dev->num_tx_queues; i++) {
+               txq = netdev_get_tx_queue(dev, i);
+               tx_bytes   += txq->tx_bytes;
+               tx_packets += txq->tx_packets;
+               tx_dropped += txq->tx_dropped;
+       }
+       if (tx_bytes || tx_packets || tx_dropped) {
+               stats->tx_bytes   = tx_bytes;
+               stats->tx_packets = tx_packets;
+               stats->tx_dropped = tx_dropped;
+       }
+}
+EXPORT_SYMBOL(dev_txq_stats_fold);
+
+/**
  *     dev_get_stats   - get network device statistics
  *     @dev: device to get statistics from
  *
@@ -5182,25 +5208,9 @@ const struct net_device_stats *dev_get_stats(struct net_device *dev)
 
        if (ops->ndo_get_stats)
                return ops->ndo_get_stats(dev);
-       else {
-               unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
-               struct net_device_stats *stats = &dev->stats;
-               unsigned int i;
-               struct netdev_queue *txq;
-
-               for (i = 0; i < dev->num_tx_queues; i++) {
-                       txq = netdev_get_tx_queue(dev, i);
-                       tx_bytes   += txq->tx_bytes;
-                       tx_packets += txq->tx_packets;
-                       tx_dropped += txq->tx_dropped;
-               }
-               if (tx_bytes || tx_packets || tx_dropped) {
-                       stats->tx_bytes   = tx_bytes;
-                       stats->tx_packets = tx_packets;
-                       stats->tx_dropped = tx_dropped;
-               }
-               return stats;
-       }
+
+       dev_txq_stats_fold(dev, &dev->stats);
+       return &dev->stats;
 }
 EXPORT_SYMBOL(dev_get_stats);