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authorEric Dumazet <eric.dumazet@gmail.com>2009-10-05 00:11:22 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-05 00:21:57 -0700
commit0bfbedb14a8a96c529341bec88991a92b41fac72 (patch)
treed52ccb4758fd58cbf74c7a9001e6885275d3ddc8 /net/ipv4/ip_gre.c
parent16c6cf8bb471392fd09b48b7c27e7d83a446b4bc (diff)
tunnels: Optimize tx path
We currently dirty a cache line to update tunnel device stats (tx_packets/tx_bytes). We better use the txq->tx_bytes/tx_packets counters that already are present in cpu cache, in the cache line shared with txq->_xmit_lock This patch extends IPTUNNEL_XMIT() macro to use txq pointer provided by the caller. Also &tunnel->dev->stats can be replaced by &dev->stats Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 41ada9904d3..89ff9d5b150 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -662,7 +662,8 @@ drop_nolock:
static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
- struct net_device_stats *stats = &tunnel->dev->stats;
+ struct net_device_stats *stats = &dev->stats;
+ struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
struct iphdr *old_iph = ip_hdr(skb);
struct iphdr *tiph;
u8 tos;
@@ -810,7 +811,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
if (!new_skb) {
ip_rt_put(rt);
- stats->tx_dropped++;
+ txq->tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}