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bridge: per-cpu packet statistics (v3)

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The shared packet statistics are a potential source of slow down
on bridged traffic. Convert to per-cpu array, but only keep those
statistics which change per-packet.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2010-03-02 13:32:09 +00:00 committed by David S. Miller
parent 0a9627f264
commit 14bb478983
4 changed files with 57 additions and 6 deletions
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43
net/bridge/br_device.c
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@ -26,12 +26,13 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
const unsigned char *dest = skb->data;
struct net_bridge_fdb_entry *dst;
struct net_bridge_mdb_entry *mdst;
struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
brstats->tx_packets++;
brstats->tx_bytes += skb->len;
BR_INPUT_SKB_CB(skb)->brdev = dev;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
skb_reset_mac_header(skb);
skb_pull(skb, ETH_HLEN);
@ -81,6 +82,31 @@ static int br_dev_stop(struct net_device *dev)
return 0;
}
static struct net_device_stats *br_get_stats(struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct br_cpu_netstats sum = { 0 };
unsigned int cpu;
for_each_possible_cpu(cpu) {
const struct br_cpu_netstats *bstats
= per_cpu_ptr(br->stats, cpu);
sum.tx_bytes += bstats->tx_bytes;
sum.tx_packets += bstats->tx_packets;
sum.rx_bytes += bstats->rx_bytes;
sum.rx_packets += bstats->rx_packets;
}
stats->tx_bytes = sum.tx_bytes;
stats->tx_packets = sum.tx_packets;
stats->rx_bytes = sum.rx_bytes;
stats->rx_packets = sum.rx_packets;
return stats;
}
static int br_change_mtu(struct net_device *dev, int new_mtu)
{
struct net_bridge *br = netdev_priv(dev);
@ -180,19 +206,28 @@ static const struct net_device_ops br_netdev_ops = {
.ndo_open = br_dev_open,
.ndo_stop = br_dev_stop,
.ndo_start_xmit = br_dev_xmit,
.ndo_get_stats = br_get_stats,
.ndo_set_mac_address = br_set_mac_address,
.ndo_set_multicast_list = br_dev_set_multicast_list,
.ndo_change_mtu = br_change_mtu,
.ndo_do_ioctl = br_dev_ioctl,
};
static void br_dev_free(struct net_device *dev)
{
struct net_bridge *br = netdev_priv(dev);
free_percpu(br->stats);
free_netdev(dev);
}
void br_dev_setup(struct net_device *dev)
{
random_ether_addr(dev->dev_addr);
ether_setup(dev);
dev->netdev_ops = &br_netdev_ops;
dev->destructor = free_netdev;
dev->destructor = br_dev_free;
SET_ETHTOOL_OPS(dev, &br_ethtool_ops);
dev->tx_queue_len = 0;
dev->priv_flags = IFF_EBRIDGE;

6
net/bridge/br_if.c
View File

@ -185,6 +185,12 @@ static struct net_device *new_bridge_dev(struct net *net, const char *name)
br = netdev_priv(dev);
br->dev = dev;
br->stats = alloc_percpu(struct br_cpu_netstats);
if (!br->stats) {
free_netdev(dev);
return NULL;
}
spin_lock_init(&br->lock);
INIT_LIST_HEAD(&br->port_list);
spin_lock_init(&br->hash_lock);

6
net/bridge/br_input.c
View File

@ -23,9 +23,11 @@ const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
static int br_pass_frame_up(struct sk_buff *skb)
{
struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
struct net_bridge *br = netdev_priv(brdev);
struct br_cpu_netstats *brstats = this_cpu_ptr(br->stats);
brdev->stats.rx_packets++;
brdev->stats.rx_bytes += skb->len;
brstats->rx_packets++;
brstats->rx_bytes += skb->len;
indev = skb->dev;
skb->dev = brdev;

8
net/bridge/br_private.h
View File

@ -135,6 +135,14 @@ struct net_bridge
spinlock_t lock;
struct list_head port_list;
struct net_device *dev;
struct br_cpu_netstats __percpu {
unsigned long rx_packets;
unsigned long rx_bytes;
unsigned long tx_packets;
unsigned long tx_bytes;
} *stats;
spinlock_t hash_lock;
struct hlist_head hash[BR_HASH_SIZE];
unsigned long feature_mask;