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Commit 015f0688 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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 caf586e5
("net: add a core netdev->rx_dropped counter")

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 43279500

include/linux/netdevice.h

+4 −3
Original line number Diff line number Diff line
@@ -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).

net/core/dev.c

+2 −0
Original line number Diff line number Diff line
@@ -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);