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net: add dev_txq_stats_fold() helper

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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>
This commit is contained in:
Eric Dumazet 2009-11-16 03:36:51 +00:00 committed by David S. Miller
parent b038b0401f
commit d83345adf9
2 changed files with 29 additions and 18 deletions
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1
include/linux/netdevice.h
View file

@ -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;

46
net/core/dev.c
View file

@ -5168,6 +5168,32 @@ 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);