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Message-ID: <20100301161658.5a61143b@nehalam>
Date: Mon, 1 Mar 2010 16:16:58 -0800
From: Stephen Hemminger <shemminger@...tta.com>
To: David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
bridge@...ts.linux-foundation.org
Subject: [PATCH] bridge: per-cpu packet statistics
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@...tta.com>
---
net/bridge/br_device.c | 43 ++++++++++++++++++++++++++++++++++++++-----
net/bridge/br_if.c | 6 ++++++
net/bridge/br_input.c | 5 +++--
net/bridge/br_private.h | 8 ++++++++
4 files changed, 55 insertions(+), 7 deletions(-)
--- a/net/bridge/br_device.c 2010-03-01 08:22:23.476657998 -0800
+++ b/net/bridge/br_device.c 2010-03-01 15:31:36.737227465 -0800
@@ -26,11 +26,12 @@ netdev_tx_t br_dev_xmit(struct sk_buff *
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);
- BR_INPUT_SKB_CB(skb)->brdev = dev;
+ brstats->tx_packets++;
+ brstats->tx_bytes += skb->len;
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += skb->len;
+ BR_INPUT_SKB_CB(skb)->brdev = dev;
skb_reset_mac_header(skb);
skb_pull(skb, ETH_HLEN);
@@ -81,6 +82,28 @@ static int br_dev_stop(struct net_device
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;
+ unsigned int cpu;
+
+ stats->tx_bytes = stats->tx_packets = 0;
+ stats->rx_bytes = stats->rx_packets = 0;
+
+ for_each_online_cpu(cpu) {
+ const struct br_cpu_netstats *bstats
+ = per_cpu_ptr(br->stats, cpu);
+
+ stats->tx_bytes += bstats->tx_bytes;
+ stats->tx_packets += bstats->tx_packets;
+ stats->rx_bytes += bstats->rx_bytes;
+ stats->rx_packets += bstats->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 +203,27 @@ static const struct net_device_ops br_ne
.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);
+}
+
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;
--- a/net/bridge/br_if.c 2010-03-01 08:22:23.476657998 -0800
+++ b/net/bridge/br_if.c 2010-03-01 15:30:47.733227819 -0800
@@ -185,6 +185,12 @@ static struct net_device *new_bridge_dev
br = netdev_priv(dev);
br->dev = dev;
+ br->stats = alloc_percpu(sizeof(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);
--- a/net/bridge/br_input.c 2010-03-01 08:22:23.476657998 -0800
+++ b/net/bridge/br_input.c 2010-03-01 15:32:45.882471626 -0800
@@ -23,9 +23,11 @@ const u8 br_group_address[ETH_ALEN] = {
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;
--- a/net/bridge/br_private.h 2010-03-01 08:22:23.476657998 -0800
+++ b/net/bridge/br_private.h 2010-03-01 15:31:03.437228864 -0800
@@ -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 tx_packets;
+ unsigned long rx_bytes;
+ unsigned long tx_bytes;
+ } *stats;
+
spinlock_t hash_lock;
struct hlist_head hash[BR_HASH_SIZE];
unsigned long feature_mask;
--
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