[PATCH net-next 2/5] qmi_wwan: switch to core handling of rx/tx byte/packet counters

[Heiner Kallweit]

Use netdev->tstats instead of a member of qmimux_priv for storing
a pointer to the per-cpu counters. This allows us to use core
functionality for statistics handling.

Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
---
 drivers/net/usb/qmi_wwan.c | 39 ++++++++------------------------------
 1 file changed, 8 insertions(+), 31 deletions(-)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 581ed51ab..b9d74d9a7 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -72,7 +72,6 @@ struct qmimux_hdr {
 struct qmimux_priv {
        struct net_device *real_dev;
        u8 mux_id;
-       struct pcpu_sw_netstats __percpu *stats64;
 };
 
 static int qmimux_open(struct net_device *dev)
@@ -108,34 +107,19 @@ static netdev_tx_t qmimux_start_xmit(struct sk_buff *skb, 
struct net_device *dev
        skb->dev = priv->real_dev;
        ret = dev_queue_xmit(skb);
 
-       if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
-               struct pcpu_sw_netstats *stats64 = this_cpu_ptr(priv->stats64);
-
-               u64_stats_update_begin(&stats64->syncp);
-               stats64->tx_packets++;
-               stats64->tx_bytes += len;
-               u64_stats_update_end(&stats64->syncp);
-       } else {
+       if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
+               dev_sw_netstats_tx_add(dev, 1, len);
+       else
                dev->stats.tx_dropped++;
-       }
 
        return ret;
 }
 
-static void qmimux_get_stats64(struct net_device *net,
-                              struct rtnl_link_stats64 *stats)
-{
-       struct qmimux_priv *priv = netdev_priv(net);
-
-       netdev_stats_to_stats64(stats, &net->stats);
-       dev_fetch_sw_netstats(stats, priv->stats64);
-}
-
 static const struct net_device_ops qmimux_netdev_ops = {
        .ndo_open        = qmimux_open,
        .ndo_stop        = qmimux_stop,
        .ndo_start_xmit  = qmimux_start_xmit,
-       .ndo_get_stats64 = qmimux_get_stats64,
+       .ndo_get_stats64 = dev_get_tstats64,
 };
 
 static void qmimux_setup(struct net_device *dev)
@@ -224,14 +208,7 @@ static int qmimux_rx_fixup(struct usbnet *dev, struct 
sk_buff *skb)
                        net->stats.rx_errors++;
                        return 0;
                } else {
-                       struct pcpu_sw_netstats *stats64;
-                       struct qmimux_priv *priv = netdev_priv(net);
-
-                       stats64 = this_cpu_ptr(priv->stats64);
-                       u64_stats_update_begin(&stats64->syncp);
-                       stats64->rx_packets++;
-                       stats64->rx_bytes += pkt_len;
-                       u64_stats_update_end(&stats64->syncp);
+                       dev_sw_netstats_rx_add(net, pkt_len);
                }
 
 skip:
@@ -256,8 +233,8 @@ static int qmimux_register_device(struct net_device 
*real_dev, u8 mux_id)
        priv->mux_id = mux_id;
        priv->real_dev = real_dev;
 
-       priv->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-       if (!priv->stats64) {
+       new_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+       if (!new_dev->tstats) {
                err = -ENOBUFS;
                goto out_free_newdev;
        }
@@ -292,7 +269,7 @@ static void qmimux_unregister_device(struct net_device *dev,
        struct qmimux_priv *priv = netdev_priv(dev);
        struct net_device *real_dev = priv->real_dev;
 
-       free_percpu(priv->stats64);
+       free_percpu(dev->tstats);
        netdev_upper_dev_unlink(real_dev, dev);
        unregister_netdevice_queue(dev, head);
 
-- 
2.29.2