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net: rx_dropped accounting

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Under load, netif_rx() can drop incoming packets but administrators dont
have a chance to spot which device needs some tuning (RPS activation for
example)

This patch adds rx_dropped accounting in vlans and tunnels.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2010-09-20 00:12:11 +00:00 • committed by David S. Miller
commit 8990f468ae
7 changed files with 28 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

2
net/8021q/vlan.h
View file

@ -25,6 +25,7 @@ struct vlan_priority_tci_mapping {
* @rx_multicast: number of received multicast packets
* @syncp: synchronization point for 64bit counters
* @rx_errors: number of errors
* @rx_dropped: number of dropped packets
*/
struct vlan_rx_stats {
u64 rx_packets;
@ -32,6 +33,7 @@ struct vlan_rx_stats {
u64 rx_multicast;
struct u64_stats_sync syncp;
unsigned long rx_errors;
unsigned long rx_dropped;
};
/**

9
net/8021q/vlan_dev.c
View file

@ -225,7 +225,10 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
}
}
netif_rx(skb);
if (unlikely(netif_rx(skb) == NET_RX_DROP)) {
if (rx_stats)
rx_stats->rx_dropped++;
}
rcu_read_unlock();
return NET_RX_SUCCESS;
@ -843,13 +846,15 @@ static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, st
accum.rx_packets += rxpackets;
accum.rx_bytes += rxbytes;
accum.rx_multicast += rxmulticast;
/* rx_errors is an ulong, not protected by syncp */
/* rx_errors, rx_dropped are ulong, not protected by syncp */
accum.rx_errors += p->rx_errors;
accum.rx_dropped += p->rx_dropped;
}
stats->rx_packets = accum.rx_packets;
stats->rx_bytes = accum.rx_bytes;
stats->rx_errors = accum.rx_errors;
stats->multicast = accum.rx_multicast;
stats->rx_dropped = accum.rx_dropped;
}
return stats;
}