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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 <decot@googlers.com>
[Florian:
* rebase
* add documentation
* merge carrier_changes with up/down counters]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Decotigny
2018-01-18 09:59:13 -08:00
committed by David S. Miller
parent e8660ded7f
commit b2d3bcfa26
6 changed files with 67 additions and 7 deletions
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6
include/linux/netdevice.h
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@@ -1680,8 +1680,6 @@ struct net_device {
unsigned long base_addr;
int irq;
atomic_t carrier_changes;
/*
* Some hardware also needs these fields (state,dev_list,
* napi_list,unreg_list,close_list) but they are not
@@ -1719,6 +1717,10 @@ struct net_device {
atomic_long_t tx_dropped;
atomic_long_t rx_nohandler;
/* Stats to monitor link on/off, flapping */
atomic_t carrier_up_count;
atomic_t carrier_down_count;
#ifdef CONFIG_WIRELESS_EXT
const struct iw_handler_def *wireless_handlers;
struct iw_public_data *wireless_data;