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>

1 files changed, 0 insertions, 2 deletions

diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index b26ce343072c..8d9503ad01da 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -25,7 +25,6 @@ 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;
@@ -33,7 +32,6 @@ struct vlan_rx_stats {
         u64                     rx_multicast;
         struct u64_stats_sync   syncp;
         unsigned long           rx_errors;
-        unsigned long           rx_dropped;
 };
 
 /**