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mac80211: use per-CPU TX/RX statistics

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This isn't all that relevant for RX right now, but TX can be concurrent
due to multi-queue and the accounting is therefore broken.

Use the standard per-CPU statistics to avoid this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2015-04-22 17:10:38 +02:00
parent ce5b071a45
commit 5a490510ba
3 changed files with 70 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

45
net/mac80211/iface.c
View file

@ -1094,6 +1094,35 @@ static u16 ieee80211_netdev_select_queue(struct net_device *dev,
return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
}
static struct rtnl_link_stats64 *
ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
int i;
for_each_possible_cpu(i) {
const struct pcpu_sw_netstats *tstats;
u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
unsigned int start;
tstats = per_cpu_ptr(dev->tstats, i);
do {
start = u64_stats_fetch_begin_irq(&tstats->syncp);
rx_packets = tstats->rx_packets;
tx_packets = tstats->tx_packets;
rx_bytes = tstats->rx_bytes;
tx_bytes = tstats->tx_bytes;
} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
stats->rx_packets += rx_packets;
stats->tx_packets += tx_packets;
stats->rx_bytes += rx_bytes;
stats->tx_bytes += tx_bytes;
}
return stats;
}
static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
@ -1103,6 +1132,7 @@ static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_netdev_select_queue,
.ndo_get_stats64 = ieee80211_get_stats64,
};
static u16 ieee80211_monitor_select_queue(struct net_device *dev,
@ -1136,14 +1166,21 @@ static const struct net_device_ops ieee80211_monitorif_ops = {
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = ieee80211_change_mac,
.ndo_select_queue = ieee80211_monitor_select_queue,
.ndo_get_stats64 = ieee80211_get_stats64,
};
static void ieee80211_if_free(struct net_device *dev)
{
free_percpu(dev->tstats);
free_netdev(dev);
}
static void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->netdev_ops = &ieee80211_dataif_ops;
dev->destructor = free_netdev;
dev->destructor = ieee80211_if_free;
}
static void ieee80211_iface_work(struct work_struct *work)
@ -1684,6 +1721,12 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
return -ENOMEM;
dev_net_set(ndev, wiphy_net(local->hw.wiphy));
ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!ndev->tstats) {
free_netdev(ndev);
return -ENOMEM;
}
ndev->needed_headroom = local->tx_headroom +
4*6 /* four MAC addresses */
+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */

21
net/mac80211/rx.c
View file

@ -32,6 +32,16 @@
#include "wme.h"
#include "rate.h"
static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
{
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->rx_packets++;
tstats->rx_bytes += len;
u64_stats_update_end(&tstats->syncp);
}
/*
* monitor mode reception
*
@ -529,8 +539,7 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
}
prev_dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
ieee80211_rx_stats(sdata->dev, skb->len);
}
if (prev_dev) {
@ -2036,12 +2045,11 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
struct sta_info *dsta;
dev->stats.rx_packets++;
dev->stats.rx_bytes += rx->skb->len;
skb = rx->skb;
xmit_skb = NULL;
ieee80211_rx_stats(dev, skb->len);
if ((sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
@ -3045,8 +3053,7 @@ static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
}
prev_dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
ieee80211_rx_stats(sdata->dev, skb->len);
}
if (prev_dev) {

16
net/mac80211/tx.c
View file

@ -37,6 +37,16 @@
/* misc utils */
static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
{
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->tx_packets++;
tstats->tx_bytes += len;
u64_stats_update_end(&tstats->syncp);
}
static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
struct sk_buff *skb, int group_addr,
int next_frag_len)
@ -2727,8 +2737,7 @@ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
return true;
}
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len + extra_head;
ieee80211_tx_stats(dev, skb->len + extra_head);
/* will not be crypto-handled beyond what we do here, so use false
* as the may-encrypt argument for the resize to not account for
@ -2909,8 +2918,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
if (IS_ERR(skb))
goto out;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
ieee80211_tx_stats(dev, skb->len);
ieee80211_xmit(sdata, sta, skb);
}