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Commit f613ed66 authored by Florian Fainelli's avatar Florian Fainelli Committed by David S. Miller
Browse files

net: dsa: Add support for 64-bit statistics



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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b2f9d432
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+6 −2
Original line number Diff line number Diff line
@@ -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);

+2 −0
Original line number Diff line number Diff line
@@ -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;

+31 −7
Original line number Diff line number Diff line
@@ -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);
}
@@ -869,6 +875,22 @@ 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;
@@ -944,6 +966,7 @@ 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 = {
@@ -1179,6 +1202,7 @@ 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;