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Subject[PATCH] net: device - added support of clearing device statistics
Date
This patch adds the support of clearing device statistics. Added new 
entry ndo_clear_stats to net_device_ops for device drivers to provide
there own method to clear stats otherwise internal statistics structure
is cleared.

Signed-off-by: Sasikantha babu <sasikanth.v19@gmail.com>
---
include/linux/netdevice.h | 3 +++
net/core/dev.c | 23 +++++++++++++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5cbaa20..3366bd6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -935,6 +935,8 @@ struct net_device_ops {
struct rtnl_link_stats64 *storage);
struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);

+ void (*ndo_clear_stats) (struct net_device *dev);
+
int (*ndo_vlan_rx_add_vid)(struct net_device *dev,
unsigned short vid);
int (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
@@ -2576,6 +2578,7 @@ extern void dev_load(struct net *net, const char *name);
extern void dev_mcast_init(void);
extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *storage);
+extern void dev_clear_stats(struct net_device *dev);
extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
const struct net_device_stats *netdev_stats);

diff --git a/net/core/dev.c b/net/core/dev.c
index 9bb8f87..fc29ea4 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5870,6 +5870,29 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
}
EXPORT_SYMBOL(dev_get_stats);

+/**
+ * dev_clear_stats - Clear network device statistics
+ * @dev: device to clear statistics from
+ *
+ * Clears network statistics of device.
+ * The device driver may provide its own method by setting
+ * dev->netdev_ops->ndo_clear_stats;
+ * otherwise the internal statistics structure is used.
+ */
+void dev_clear_stats(struct net_device *dev)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ if (ops->ndo_clear_stats)
+ ops->ndo_clear_stats(dev);
+ else
+ memset(&dev->stats, 0, sizeof(dev->stats));
+
+ atomic_long_set(&dev->rx_dropped, 0);
+ return;
+}
+EXPORT_SYMBOL(dev_clear_stats);
+
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
{
struct netdev_queue *queue = dev_ingress_queue(dev);
--
1.7.3.4


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