net: add a core netdev->rx_dropped counter

In various situations, a device provides a packet to our stack and we
drop it before it enters protocol stack :
- softnet backlog full (accounted in /proc/net/softnet_stat)
- bad vlan tag (not accounted)
- unknown/unregistered protocol (not accounted)

We can handle a per-device counter of such dropped frames at core level,
and automatically adds it to the device provided stats (rx_dropped), so
that standard tools can be used (ifconfig, ip link, cat /proc/net/dev)

This is a generalization of commit 8990f468a (net: rx_dropped
accounting), thus reverting it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-09-30 21:06:55 +00:00
committed by David S. Miller
parent a00eac0c45
commit caf586e5f2
11 changed files with 26 additions and 34 deletions

View File

@ -1483,8 +1483,9 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
skb_orphan(skb);
nf_reset(skb);
if (!(dev->flags & IFF_UP) ||
(skb->len > (dev->mtu + dev->hard_header_len))) {
if (unlikely(!(dev->flags & IFF_UP) ||
(skb->len > (dev->mtu + dev->hard_header_len)))) {
atomic_long_inc(&dev->rx_dropped);
kfree_skb(skb);
return NET_RX_DROP;
}
@ -2548,6 +2549,7 @@ enqueue:
local_irq_restore(flags);
atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);
return NET_RX_DROP;
}
@ -2995,6 +2997,7 @@ ncls:
if (pt_prev) {
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
} else {
atomic_long_inc(&skb->dev->rx_dropped);
kfree_skb(skb);
/* Jamal, now you will not able to escape explaining
* me how you were going to use this. :-)
@ -5429,14 +5432,14 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
if (ops->ndo_get_stats64) {
memset(storage, 0, sizeof(*storage));
return ops->ndo_get_stats64(dev, storage);
}
if (ops->ndo_get_stats) {
ops->ndo_get_stats64(dev, storage);
} else if (ops->ndo_get_stats) {
netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
return storage;
} else {
netdev_stats_to_stats64(storage, &dev->stats);
dev_txq_stats_fold(dev, storage);
}
netdev_stats_to_stats64(storage, &dev->stats);
dev_txq_stats_fold(dev, storage);
storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
return storage;
}
EXPORT_SYMBOL(dev_get_stats);