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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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4
net/sched/sch_generic.c
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@ -510,7 +510,7 @@ void netif_carrier_on(struct net_device *dev)
if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
if (dev->reg_state == NETREG_UNINITIALIZED)
return;
atomic_inc(&dev->carrier_changes);
atomic_inc(&dev->carrier_up_count);
linkwatch_fire_event(dev);
if (netif_running(dev))
__netdev_watchdog_up(dev);
@ -529,7 +529,7 @@ void netif_carrier_off(struct net_device *dev)
if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
if (dev->reg_state == NETREG_UNINITIALIZED)
return;
atomic_inc(&dev->carrier_changes);
atomic_inc(&dev->carrier_down_count);
linkwatch_fire_event(dev);
}
}