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>
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 4b0e30b..2d9663a 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -64,7 +64,6 @@
u64 packets;
u64 bytes;
struct u64_stats_sync syncp;
- unsigned long drops;
};
/*
@@ -90,8 +89,7 @@
lb_stats->bytes += len;
lb_stats->packets++;
u64_stats_update_end(&lb_stats->syncp);
- } else
- lb_stats->drops++;
+ }
return NETDEV_TX_OK;
}
@@ -101,7 +99,6 @@
{
u64 bytes = 0;
u64 packets = 0;
- u64 drops = 0;
int i;
for_each_possible_cpu(i) {
@@ -115,14 +112,11 @@
tbytes = lb_stats->bytes;
tpackets = lb_stats->packets;
} while (u64_stats_fetch_retry(&lb_stats->syncp, start));
- drops += lb_stats->drops;
bytes += tbytes;
packets += tpackets;
}
stats->rx_packets = packets;
stats->tx_packets = packets;
- stats->rx_dropped = drops;
- stats->rx_errors = drops;
stats->rx_bytes = bytes;
stats->tx_bytes = bytes;
return stats;