lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <20100302153209.74742a96@nehalam> Date: Tue, 2 Mar 2010 15:32:09 -0800 From: Stephen Hemminger <shemminger@...tta.com> To: David Miller <davem@...emloft.net> Cc: Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org, bridge@...ts.linux-foundation.org Subject: [Bridge] [PATCH] bridge: per-cpu packet statistics (v3) 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> --- Move tx and rx to be next to each other per Eric's suggestion 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 2010-03-02 10:48:44.527817663 -0800 +++ b/net/bridge/br_device.c 2010-03-02 10:48:48.287817348 -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 +82,31 @@ 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; + 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_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); + 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; --- a/net/bridge/br_if.c 2010-03-02 10:48:44.507817575 -0800 +++ b/net/bridge/br_if.c 2010-03-02 10:48:48.287817348 -0800 @@ -185,6 +185,12 @@ static struct net_device *new_bridge_dev 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); --- a/net/bridge/br_input.c 2010-03-02 10:48:44.515818544 -0800 +++ b/net/bridge/br_input.c 2010-03-02 10:48:48.287817348 -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 2010-03-02 10:48:44.503817627 -0800 +++ b/net/bridge/br_private.h 2010-03-02 10:49:10.632566819 -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 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; -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists