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authordavid decotigny <decot@googlers.com>2014-03-29 09:48:35 -0700
committerDavid S. Miller <davem@davemloft.net>2014-03-31 16:24:52 -0400
commit2d3b479df41a10e2f41f9259fcba775bd34de6e4 (patch)
tree517291066c35188a41b005e81904e69865643e76 /net/core/net-sysfs.c
parent9c76a114bbef10b4d44bd258006721dd896695dd (diff)
downloadlinux-2d3b479df41a10e2f41f9259fcba775bd34de6e4.tar.bz2
net-sysfs: expose number of carrier on/off changes
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>
Diffstat (limited to 'net/core/net-sysfs.c')
-rw-r--r--net/core/net-sysfs.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index daed9a64c6f6..462396278484 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -253,6 +253,16 @@ static ssize_t operstate_show(struct device *dev,
}
static DEVICE_ATTR_RO(operstate);
+static ssize_t carrier_changes_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct net_device *netdev = to_net_dev(dev);
+ return sprintf(buf, fmt_dec,
+ atomic_read(&netdev->carrier_changes));
+}
+static DEVICE_ATTR_RO(carrier_changes);
+
/* read-write attributes */
static int change_mtu(struct net_device *net, unsigned long new_mtu)
@@ -386,6 +396,7 @@ static struct attribute *net_class_attrs[] = {
&dev_attr_duplex.attr,
&dev_attr_dormant.attr,
&dev_attr_operstate.attr,
+ &dev_attr_carrier_changes.attr,
&dev_attr_ifalias.attr,
&dev_attr_carrier.attr,
&dev_attr_mtu.attr,