[PATCH v3] net: openvswitch: use core API to update/provide stats

[Lev Stipakov]

Commit d3fd65484c781 ("net: core: add dev_sw_netstats_tx_add") has added
function "dev_sw_netstats_tx_add()" to update net device per-cpu TX
stats.

Use this function instead of own code.

While on it, remove internal_get_stats() and replace it
with dev_get_tstats64().

Signed-off-by: Lev Stipakov <l...@openvpn.net>
Reviewed-by: Heiner Kallweit <hkallwe...@gmail.com>
---

 v3: no code changes, just send separate patch instead of series as
requested

 v2:
  - do not delete len variable and add comment why
  - replace internal_get_stats() vs dev_get_tstats64()

 net/openvswitch/vport-internal_dev.c | 29 +++++++---------------------
 1 file changed, 7 insertions(+), 22 deletions(-)

diff --git a/net/openvswitch/vport-internal_dev.c 
b/net/openvswitch/vport-internal_dev.c
index 1e30d8df3ba5..5b2ee9c1c00b 100644
--- a/net/openvswitch/vport-internal_dev.c
+++ b/net/openvswitch/vport-internal_dev.c
@@ -35,21 +35,18 @@ internal_dev_xmit(struct sk_buff *skb, struct net_device 
*netdev)
 {
        int len, err;
 
+       /* store len value because skb can be freed inside ovs_vport_receive() 
*/
        len = skb->len;
+
        rcu_read_lock();
        err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
        rcu_read_unlock();
 
-       if (likely(!err)) {
-               struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
-
-               u64_stats_update_begin(&tstats->syncp);
-               tstats->tx_bytes += len;
-               tstats->tx_packets++;
-               u64_stats_update_end(&tstats->syncp);
-       } else {
+       if (likely(!err))
+               dev_sw_netstats_tx_add(netdev, 1, len);
+       else
                netdev->stats.tx_errors++;
-       }
+
        return NETDEV_TX_OK;
 }
 
@@ -83,24 +80,12 @@ static void internal_dev_destructor(struct net_device *dev)
        ovs_vport_free(vport);
 }
 
-static void
-internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
-{
-       memset(stats, 0, sizeof(*stats));
-       stats->rx_errors  = dev->stats.rx_errors;
-       stats->tx_errors  = dev->stats.tx_errors;
-       stats->tx_dropped = dev->stats.tx_dropped;
-       stats->rx_dropped = dev->stats.rx_dropped;
-
-       dev_fetch_sw_netstats(stats, dev->tstats);
-}
-
 static const struct net_device_ops internal_dev_netdev_ops = {
        .ndo_open = internal_dev_open,
        .ndo_stop = internal_dev_stop,
        .ndo_start_xmit = internal_dev_xmit,
        .ndo_set_mac_address = eth_mac_addr,
-       .ndo_get_stats64 = internal_get_stats,
+       .ndo_get_stats64 = dev_get_tstats64,
 };
 
 static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
-- 
2.25.1