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net-sysfs: expose number of carrier on/off changes

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This allows to monitor carrier on/off transitions and detect link
flapping issues:
 - new /sys/class/net/X/carrier_changes
 - new rtnetlink IFLA_CARRIER_CHANGES (getlink)

Tested:
  - grep . /sys/class/net/*/carrier_changes
    + ip link set dev X down/up
    + plug/unplug cable
  - updated iproute2: prints IFLA_CARRIER_CHANGES
  - iproute2 20121211-2 (debian): unchanged behavior

Signed-off-by: David Decotigny <decot@googlers.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
david decotigny 2014-03-29 09:48:35 -07:00 • committed by David S. Miller
commit 2d3b479df4
5 changed files with 22 additions and 1 deletions
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3
include/linux/netdevice.h
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@ -1308,6 +1308,9 @@ struct net_device {
atomic_long_t rx_dropped;
atomic_long_t tx_dropped;
/* Stats to monitor carrier on<->off transitions */
atomic_t carrier_changes;
#ifdef CONFIG_WIRELESS_EXT
/* List of functions to handle Wireless Extensions (instead of ioctl).
* See <net/iw_handler.h> for details. Jean II */