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net: core: Expose number of link up/down transitions

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Expose the number of times the link has been going UP or DOWN, and
update the "carrier_changes" counter to be the sum of these two events.
While at it, also update the sysfs-class-net documentation to cover:
carrier_changes (3.15), carrier_up_count (4.16) and carrier_down_count
(4.16)

Signed-off-by: David Decotigny <[email protected]>
[Florian:
* rebase
* add documentation
* merge carrier_changes with up/down counters]
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Decotigny 2018-01-18 09:59:13 -08:00 • committed by David S. Miller
commit b2d3bcfa26
6 changed files with 67 additions and 7 deletions
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24
Documentation/ABI/testing/sysfs-class-net
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@ -259,3 +259,27 @@ Contact: [email protected]
Description:
Symbolic link to the PHY device this network device is attached
to.
What: /sys/class/net/<iface>/carrier_changes
Date: Mar 2014
KernelVersion: 3.15
Contact: [email protected]
Description:
32-bit unsigned integer counting the number of times the link has
seen a change from UP to DOWN and vice versa
What: /sys/class/net/<iface>/carrier_up_count
Date: Jan 2018
KernelVersion: 4.16
Contact: [email protected]
Description:
32-bit unsigned integer counting the number of times the link has
been up
What: /sys/class/net/<iface>/carrier_down_count
Date: Jan 2018
KernelVersion: 4.16
Contact: [email protected]
Description:
32-bit unsigned integer counting the number of times the link has
been down