From: david decotigny <decot@googlers.com>
Date: Sat, 29 Mar 2014 16:48:35 +0000 (-0700)
Subject: net-sysfs: expose number of carrier on/off changes
X-Git-Tag: v3.15-rc1~113^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d3b479df41a10e2f41f9259fcba775bd34de6e4;p=pandora-kernel.git

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>
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