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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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