From 5bb83df363f2aecb39c9bf586b1b165f6e84c4bf Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 27 Mar 2014 08:45:56 -0700
Subject: [PATCH] net: net: add a core netdev->tx_dropped counter
Dropping packets in __dev_queue_xmit() when transmit queue
is stopped (NIC TX ring buffer full or BQL limit reached) currently
outputs a syslog message.
It would be better to get a precise count of such events available in
netdevice stats so that monitoring tools can have a clue.
This extends the work done in e1bfa424eca16
("net: add a core netdev->rx_dropped counter")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/netdevice.h | 7 ++++---
net/core/dev.c | 2 ++
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4b6d12c7b803b..159c7e7945f84 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1311,9 +1311,10 @@ struct net_device {
int iflink;
struct net_device_stats stats;
- atomic_long_t rx_dropped; /* dropped packets by core network
- * Do not use this in drivers.
- */
+
+ /* dropped packets by core network, Do not use this in drivers */
+ atomic_long_t rx_dropped;
+ atomic_long_t tx_dropped;
#ifdef CONFIG_WIRELESS_EXT
/* List of functions to handle Wireless Extensions (instead of ioctl).
diff --git a/net/core/dev.c b/net/core/dev.c
index 48dd323d59183..98ba581b89f06 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2880,6 +2880,7 @@ recursion_alert:
rc = -ENETDOWN;
rcu_read_unlock_bh();
+ atomic_long_inc(&dev->tx_dropped);
kfree_skb(skb);
return rc;
out:
@@ -6238,6 +6239,7 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
netdev_stats_to_stats64(storage, &dev->stats);
}
storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
+ storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
return storage;
}
EXPORT_SYMBOL(dev_get_stats);
--
2.39.5