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Subject[PATCH net-next] net: dsa: Add support for 64-bit statistics
Date
DSA slave network devices maintain a pair of bytes and packets counters
for each directions, but these are not 64-bit capable. Re-use
pcpu_sw_netstats which contains exactly what we need for that purpose
and update the code path to report 64-bit capable statistics.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
net/dsa/dsa.c | 8 ++++++--
net/dsa/dsa_priv.h | 2 ++
net/dsa/slave.c | 38 +++++++++++++++++++++++++++++++-------
3 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index a55e2e4087a4..0ba842c08dd3 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -190,6 +190,7 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
{
struct dsa_switch_tree *dst = dev->dsa_ptr;
struct sk_buff *nskb = NULL;
+ struct dsa_slave_priv *p;

if (unlikely(dst == NULL)) {
kfree_skb(skb);
@@ -207,12 +208,15 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
}

skb = nskb;
+ p = netdev_priv(skb->dev);
skb_push(skb, ETH_HLEN);
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, skb->dev);

- skb->dev->stats.rx_packets++;
- skb->dev->stats.rx_bytes += skb->len;
+ u64_stats_update_begin(&p->stats64.syncp);
+ p->stats64.rx_packets++;
+ p->stats64.rx_bytes += skb->len;
+ u64_stats_update_end(&p->stats64.syncp);

netif_receive_skb(skb);

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index 55982cc39b24..7aa0656296c2 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -77,6 +77,8 @@ struct dsa_slave_priv {
struct sk_buff * (*xmit)(struct sk_buff *skb,
struct net_device *dev);

+ struct pcpu_sw_netstats stats64;
+
/* DSA port data, such as switch, port index, etc. */
struct dsa_port *dp;

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 9507bd38cf04..65f3cef85976 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -354,8 +354,10 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
struct dsa_slave_priv *p = netdev_priv(dev);
struct sk_buff *nskb;

- dev->stats.tx_packets++;
- dev->stats.tx_bytes += skb->len;
+ u64_stats_update_begin(&p->stats64.syncp);
+ p->stats64.tx_packets++;
+ p->stats64.tx_bytes += skb->len;
+ u64_stats_update_end(&p->stats64.syncp);

/* Transmit function may have to reallocate the original SKB,
* in which case it must have freed it. Only free it here on error.
@@ -594,11 +596,15 @@ static void dsa_slave_get_ethtool_stats(struct net_device *dev,
{
struct dsa_slave_priv *p = netdev_priv(dev);
struct dsa_switch *ds = p->dp->ds;
-
- data[0] = dev->stats.tx_packets;
- data[1] = dev->stats.tx_bytes;
- data[2] = dev->stats.rx_packets;
- data[3] = dev->stats.rx_bytes;
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&p->stats64.syncp);
+ data[0] = p->stats64.tx_packets;
+ data[1] = p->stats64.tx_bytes;
+ data[2] = p->stats64.rx_packets;
+ data[3] = p->stats64.rx_bytes;
+ } while (u64_stats_fetch_retry_irq(&p->stats64.syncp, start));
if (ds->ops->get_ethtool_stats)
ds->ops->get_ethtool_stats(ds, p->dp->index, data + 4);
}
@@ -861,6 +867,22 @@ static int dsa_slave_setup_tc(struct net_device *dev, u32 handle,
}
}

+static void dsa_slave_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
+{
+ struct dsa_slave_priv *p = netdev_priv(dev);
+ unsigned int start;
+
+ netdev_stats_to_stats64(stats, &dev->stats);
+ do {
+ start = u64_stats_fetch_begin_irq(&p->stats64.syncp);
+ stats->tx_packets = p->stats64.tx_packets;
+ stats->tx_bytes = p->stats64.tx_bytes;
+ stats->rx_packets = p->stats64.rx_packets;
+ stats->rx_bytes = p->stats64.rx_bytes;
+ } while (u64_stats_fetch_retry_irq(&p->stats64.syncp, start));
+}
+
void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
{
ops->get_sset_count = dsa_cpu_port_get_sset_count;
@@ -936,6 +958,7 @@ static const struct net_device_ops dsa_slave_netdev_ops = {
.ndo_bridge_dellink = switchdev_port_bridge_dellink,
.ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
.ndo_setup_tc = dsa_slave_setup_tc,
+ .ndo_get_stats64 = dsa_slave_get_stats64,
};

static const struct switchdev_ops dsa_slave_switchdev_ops = {
@@ -1171,6 +1194,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
slave_dev->vlan_features = master->vlan_features;

p = netdev_priv(slave_dev);
+ u64_stats_init(&p->stats64.syncp);
p->dp = &ds->ports[port];
INIT_LIST_HEAD(&p->mall_tc_list);
p->xmit = dst->tag_ops->xmit;
--
2.9.3
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