forked from Minki/linux
leds: trigger: Introduce a NETDEV trigger
This commit introduces a NETDEV trigger for named device activity. Available triggers are link, rx, and tx. Signed-off-by: Ben Whitten <ben.whitten@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
parent
e0d4229879
commit
06f502f57d
45
Documentation/ABI/testing/sysfs-class-led-trigger-netdev
Normal file
45
Documentation/ABI/testing/sysfs-class-led-trigger-netdev
Normal file
@ -0,0 +1,45 @@
|
||||
What: /sys/class/leds/<led>/device_name
|
||||
Date: Dec 2017
|
||||
KernelVersion: 4.16
|
||||
Contact: linux-leds@vger.kernel.org
|
||||
Description:
|
||||
Specifies the network device name to monitor.
|
||||
|
||||
What: /sys/class/leds/<led>/interval
|
||||
Date: Dec 2017
|
||||
KernelVersion: 4.16
|
||||
Contact: linux-leds@vger.kernel.org
|
||||
Description:
|
||||
Specifies the duration of the LED blink in milliseconds.
|
||||
Defaults to 50 ms.
|
||||
|
||||
What: /sys/class/leds/<led>/link
|
||||
Date: Dec 2017
|
||||
KernelVersion: 4.16
|
||||
Contact: linux-leds@vger.kernel.org
|
||||
Description:
|
||||
Signal the link state of the named network device.
|
||||
If set to 0 (default), the LED's normal state is off.
|
||||
If set to 1, the LED's normal state reflects the link state
|
||||
of the named network device.
|
||||
Setting this value also immediately changes the LED state.
|
||||
|
||||
What: /sys/class/leds/<led>/tx
|
||||
Date: Dec 2017
|
||||
KernelVersion: 4.16
|
||||
Contact: linux-leds@vger.kernel.org
|
||||
Description:
|
||||
Signal transmission of data on the named network device.
|
||||
If set to 0 (default), the LED will not blink on transmission.
|
||||
If set to 1, the LED will blink for the milliseconds specified
|
||||
in interval to signal transmission.
|
||||
|
||||
What: /sys/class/leds/<led>/rx
|
||||
Date: Dec 2017
|
||||
KernelVersion: 4.16
|
||||
Contact: linux-leds@vger.kernel.org
|
||||
Description:
|
||||
Signal reception of data on the named network device.
|
||||
If set to 0 (default), the LED will not blink on reception.
|
||||
If set to 1, the LED will blink for the milliseconds specified
|
||||
in interval to signal reception.
|
@ -135,4 +135,11 @@ config LEDS_TRIGGER_PANIC
|
||||
a different trigger.
|
||||
If unsure, say Y.
|
||||
|
||||
config LEDS_TRIGGER_NETDEV
|
||||
tristate "LED Netdev Trigger"
|
||||
depends on NET && LEDS_TRIGGERS
|
||||
help
|
||||
This allows LEDs to be controlled by network device activity.
|
||||
If unsure, say Y.
|
||||
|
||||
endif # LEDS_TRIGGERS
|
||||
|
@ -12,3 +12,4 @@ obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
|
||||
obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o
|
||||
obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
|
||||
obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
|
||||
obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
|
||||
|
496
drivers/leds/trigger/ledtrig-netdev.c
Normal file
496
drivers/leds/trigger/ledtrig-netdev.c
Normal file
@ -0,0 +1,496 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
|
||||
// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
|
||||
//
|
||||
// LED Kernel Netdev Trigger
|
||||
//
|
||||
// Toggles the LED to reflect the link and traffic state of a named net device
|
||||
//
|
||||
// Derived from ledtrig-timer.c which is:
|
||||
// Copyright 2005-2006 Openedhand Ltd.
|
||||
// Author: Richard Purdie <rpurdie@openedhand.com>
|
||||
|
||||
#include <linux/atomic.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/jiffies.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/leds.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/timer.h>
|
||||
#include "../leds.h"
|
||||
|
||||
/*
|
||||
* Configurable sysfs attributes:
|
||||
*
|
||||
* device_name - network device name to monitor
|
||||
* interval - duration of LED blink, in milliseconds
|
||||
* link - LED's normal state reflects whether the link is up
|
||||
* (has carrier) or not
|
||||
* tx - LED blinks on transmitted data
|
||||
* rx - LED blinks on receive data
|
||||
*
|
||||
*/
|
||||
|
||||
struct led_netdev_data {
|
||||
spinlock_t lock;
|
||||
|
||||
struct delayed_work work;
|
||||
struct notifier_block notifier;
|
||||
|
||||
struct led_classdev *led_cdev;
|
||||
struct net_device *net_dev;
|
||||
|
||||
char device_name[IFNAMSIZ];
|
||||
atomic_t interval;
|
||||
unsigned int last_activity;
|
||||
|
||||
unsigned long mode;
|
||||
#define NETDEV_LED_LINK 0
|
||||
#define NETDEV_LED_TX 1
|
||||
#define NETDEV_LED_RX 2
|
||||
#define NETDEV_LED_MODE_LINKUP 3
|
||||
};
|
||||
|
||||
enum netdev_led_attr {
|
||||
NETDEV_ATTR_LINK,
|
||||
NETDEV_ATTR_TX,
|
||||
NETDEV_ATTR_RX
|
||||
};
|
||||
|
||||
static void set_baseline_state(struct led_netdev_data *trigger_data)
|
||||
{
|
||||
int current_brightness;
|
||||
struct led_classdev *led_cdev = trigger_data->led_cdev;
|
||||
|
||||
current_brightness = led_cdev->brightness;
|
||||
if (current_brightness)
|
||||
led_cdev->blink_brightness = current_brightness;
|
||||
if (!led_cdev->blink_brightness)
|
||||
led_cdev->blink_brightness = led_cdev->max_brightness;
|
||||
|
||||
if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
|
||||
led_set_brightness(led_cdev, LED_OFF);
|
||||
else {
|
||||
if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
|
||||
led_set_brightness(led_cdev,
|
||||
led_cdev->blink_brightness);
|
||||
else
|
||||
led_set_brightness(led_cdev, LED_OFF);
|
||||
|
||||
/* If we are looking for RX/TX start periodically
|
||||
* checking stats
|
||||
*/
|
||||
if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
|
||||
test_bit(NETDEV_LED_RX, &trigger_data->mode))
|
||||
schedule_delayed_work(&trigger_data->work, 0);
|
||||
}
|
||||
}
|
||||
|
||||
static ssize_t device_name_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
ssize_t len;
|
||||
|
||||
spin_lock_bh(&trigger_data->lock);
|
||||
len = sprintf(buf, "%s\n", trigger_data->device_name);
|
||||
spin_unlock_bh(&trigger_data->lock);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static ssize_t device_name_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf,
|
||||
size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
|
||||
if (size >= IFNAMSIZ)
|
||||
return -EINVAL;
|
||||
|
||||
cancel_delayed_work_sync(&trigger_data->work);
|
||||
|
||||
spin_lock_bh(&trigger_data->lock);
|
||||
|
||||
if (trigger_data->net_dev) {
|
||||
dev_put(trigger_data->net_dev);
|
||||
trigger_data->net_dev = NULL;
|
||||
}
|
||||
|
||||
strncpy(trigger_data->device_name, buf, size);
|
||||
if (size > 0 && trigger_data->device_name[size - 1] == '\n')
|
||||
trigger_data->device_name[size - 1] = 0;
|
||||
|
||||
if (trigger_data->device_name[0] != 0)
|
||||
trigger_data->net_dev =
|
||||
dev_get_by_name(&init_net, trigger_data->device_name);
|
||||
|
||||
clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
|
||||
if (trigger_data->net_dev != NULL)
|
||||
if (netif_carrier_ok(trigger_data->net_dev))
|
||||
set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
|
||||
|
||||
trigger_data->last_activity = 0;
|
||||
|
||||
set_baseline_state(trigger_data);
|
||||
spin_unlock_bh(&trigger_data->lock);
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
static DEVICE_ATTR_RW(device_name);
|
||||
|
||||
static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
|
||||
enum netdev_led_attr attr)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
int bit;
|
||||
|
||||
switch (attr) {
|
||||
case NETDEV_ATTR_LINK:
|
||||
bit = NETDEV_LED_LINK;
|
||||
break;
|
||||
case NETDEV_ATTR_TX:
|
||||
bit = NETDEV_LED_TX;
|
||||
break;
|
||||
case NETDEV_ATTR_RX:
|
||||
bit = NETDEV_LED_RX;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
|
||||
}
|
||||
|
||||
static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
|
||||
size_t size, enum netdev_led_attr attr)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
unsigned long state;
|
||||
int ret;
|
||||
int bit;
|
||||
|
||||
ret = kstrtoul(buf, 0, &state);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
switch (attr) {
|
||||
case NETDEV_ATTR_LINK:
|
||||
bit = NETDEV_LED_LINK;
|
||||
break;
|
||||
case NETDEV_ATTR_TX:
|
||||
bit = NETDEV_LED_TX;
|
||||
break;
|
||||
case NETDEV_ATTR_RX:
|
||||
bit = NETDEV_LED_RX;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
cancel_delayed_work_sync(&trigger_data->work);
|
||||
|
||||
if (state)
|
||||
set_bit(bit, &trigger_data->mode);
|
||||
else
|
||||
clear_bit(bit, &trigger_data->mode);
|
||||
|
||||
set_baseline_state(trigger_data);
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
static ssize_t link_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
|
||||
}
|
||||
|
||||
static ssize_t link_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
|
||||
}
|
||||
|
||||
static DEVICE_ATTR_RW(link);
|
||||
|
||||
static ssize_t tx_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
|
||||
}
|
||||
|
||||
static ssize_t tx_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
|
||||
}
|
||||
|
||||
static DEVICE_ATTR_RW(tx);
|
||||
|
||||
static ssize_t rx_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
|
||||
}
|
||||
|
||||
static ssize_t rx_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf, size_t size)
|
||||
{
|
||||
return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
|
||||
}
|
||||
|
||||
static DEVICE_ATTR_RW(rx);
|
||||
|
||||
static ssize_t interval_show(struct device *dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
|
||||
return sprintf(buf, "%u\n",
|
||||
jiffies_to_msecs(atomic_read(&trigger_data->interval)));
|
||||
}
|
||||
|
||||
static ssize_t interval_store(struct device *dev,
|
||||
struct device_attribute *attr, const char *buf,
|
||||
size_t size)
|
||||
{
|
||||
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
unsigned long value;
|
||||
int ret;
|
||||
|
||||
ret = kstrtoul(buf, 0, &value);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* impose some basic bounds on the timer interval */
|
||||
if (value >= 5 && value <= 10000) {
|
||||
cancel_delayed_work_sync(&trigger_data->work);
|
||||
|
||||
atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
|
||||
set_baseline_state(trigger_data); /* resets timer */
|
||||
}
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
static DEVICE_ATTR_RW(interval);
|
||||
|
||||
static int netdev_trig_notify(struct notifier_block *nb,
|
||||
unsigned long evt, void *dv)
|
||||
{
|
||||
struct net_device *dev =
|
||||
netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
|
||||
struct led_netdev_data *trigger_data = container_of(nb,
|
||||
struct
|
||||
led_netdev_data,
|
||||
notifier);
|
||||
|
||||
if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
|
||||
&& evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
|
||||
&& evt != NETDEV_CHANGENAME)
|
||||
return NOTIFY_DONE;
|
||||
|
||||
if (strcmp(dev->name, trigger_data->device_name))
|
||||
return NOTIFY_DONE;
|
||||
|
||||
cancel_delayed_work_sync(&trigger_data->work);
|
||||
|
||||
spin_lock_bh(&trigger_data->lock);
|
||||
|
||||
clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
|
||||
switch (evt) {
|
||||
case NETDEV_REGISTER:
|
||||
if (trigger_data->net_dev)
|
||||
dev_put(trigger_data->net_dev);
|
||||
dev_hold(dev);
|
||||
trigger_data->net_dev = dev;
|
||||
break;
|
||||
case NETDEV_CHANGENAME:
|
||||
case NETDEV_UNREGISTER:
|
||||
if (trigger_data->net_dev) {
|
||||
dev_put(trigger_data->net_dev);
|
||||
trigger_data->net_dev = NULL;
|
||||
}
|
||||
break;
|
||||
case NETDEV_UP:
|
||||
case NETDEV_CHANGE:
|
||||
if (netif_carrier_ok(dev))
|
||||
set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
|
||||
break;
|
||||
}
|
||||
|
||||
set_baseline_state(trigger_data);
|
||||
|
||||
spin_unlock_bh(&trigger_data->lock);
|
||||
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
/* here's the real work! */
|
||||
static void netdev_trig_work(struct work_struct *work)
|
||||
{
|
||||
struct led_netdev_data *trigger_data = container_of(work,
|
||||
struct
|
||||
led_netdev_data,
|
||||
work.work);
|
||||
struct rtnl_link_stats64 *dev_stats;
|
||||
unsigned int new_activity;
|
||||
struct rtnl_link_stats64 temp;
|
||||
unsigned long interval;
|
||||
int invert;
|
||||
|
||||
/* If we dont have a device, insure we are off */
|
||||
if (!trigger_data->net_dev) {
|
||||
led_set_brightness(trigger_data->led_cdev, LED_OFF);
|
||||
return;
|
||||
}
|
||||
|
||||
/* If we are not looking for RX/TX then return */
|
||||
if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
|
||||
!test_bit(NETDEV_LED_RX, &trigger_data->mode))
|
||||
return;
|
||||
|
||||
dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
|
||||
new_activity =
|
||||
(test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
|
||||
dev_stats->tx_packets : 0) +
|
||||
(test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
|
||||
dev_stats->rx_packets : 0);
|
||||
|
||||
if (trigger_data->last_activity != new_activity) {
|
||||
led_stop_software_blink(trigger_data->led_cdev);
|
||||
|
||||
invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
|
||||
interval = jiffies_to_msecs(
|
||||
atomic_read(&trigger_data->interval));
|
||||
/* base state is ON (link present) */
|
||||
led_blink_set_oneshot(trigger_data->led_cdev,
|
||||
&interval,
|
||||
&interval,
|
||||
invert);
|
||||
trigger_data->last_activity = new_activity;
|
||||
}
|
||||
|
||||
schedule_delayed_work(&trigger_data->work,
|
||||
(atomic_read(&trigger_data->interval)*2));
|
||||
}
|
||||
|
||||
static void netdev_trig_activate(struct led_classdev *led_cdev)
|
||||
{
|
||||
struct led_netdev_data *trigger_data;
|
||||
int rc;
|
||||
|
||||
trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
|
||||
if (!trigger_data)
|
||||
return;
|
||||
|
||||
spin_lock_init(&trigger_data->lock);
|
||||
|
||||
trigger_data->notifier.notifier_call = netdev_trig_notify;
|
||||
trigger_data->notifier.priority = 10;
|
||||
|
||||
INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
|
||||
|
||||
trigger_data->led_cdev = led_cdev;
|
||||
trigger_data->net_dev = NULL;
|
||||
trigger_data->device_name[0] = 0;
|
||||
|
||||
trigger_data->mode = 0;
|
||||
atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
|
||||
trigger_data->last_activity = 0;
|
||||
|
||||
led_cdev->trigger_data = trigger_data;
|
||||
|
||||
rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
|
||||
if (rc)
|
||||
goto err_out;
|
||||
rc = device_create_file(led_cdev->dev, &dev_attr_link);
|
||||
if (rc)
|
||||
goto err_out_device_name;
|
||||
rc = device_create_file(led_cdev->dev, &dev_attr_rx);
|
||||
if (rc)
|
||||
goto err_out_link;
|
||||
rc = device_create_file(led_cdev->dev, &dev_attr_tx);
|
||||
if (rc)
|
||||
goto err_out_rx;
|
||||
rc = device_create_file(led_cdev->dev, &dev_attr_interval);
|
||||
if (rc)
|
||||
goto err_out_tx;
|
||||
rc = register_netdevice_notifier(&trigger_data->notifier);
|
||||
if (rc)
|
||||
goto err_out_interval;
|
||||
return;
|
||||
|
||||
err_out_interval:
|
||||
device_remove_file(led_cdev->dev, &dev_attr_interval);
|
||||
err_out_tx:
|
||||
device_remove_file(led_cdev->dev, &dev_attr_tx);
|
||||
err_out_rx:
|
||||
device_remove_file(led_cdev->dev, &dev_attr_rx);
|
||||
err_out_link:
|
||||
device_remove_file(led_cdev->dev, &dev_attr_link);
|
||||
err_out_device_name:
|
||||
device_remove_file(led_cdev->dev, &dev_attr_device_name);
|
||||
err_out:
|
||||
led_cdev->trigger_data = NULL;
|
||||
kfree(trigger_data);
|
||||
}
|
||||
|
||||
static void netdev_trig_deactivate(struct led_classdev *led_cdev)
|
||||
{
|
||||
struct led_netdev_data *trigger_data = led_cdev->trigger_data;
|
||||
|
||||
if (trigger_data) {
|
||||
unregister_netdevice_notifier(&trigger_data->notifier);
|
||||
|
||||
device_remove_file(led_cdev->dev, &dev_attr_device_name);
|
||||
device_remove_file(led_cdev->dev, &dev_attr_link);
|
||||
device_remove_file(led_cdev->dev, &dev_attr_rx);
|
||||
device_remove_file(led_cdev->dev, &dev_attr_tx);
|
||||
device_remove_file(led_cdev->dev, &dev_attr_interval);
|
||||
|
||||
cancel_delayed_work_sync(&trigger_data->work);
|
||||
|
||||
if (trigger_data->net_dev)
|
||||
dev_put(trigger_data->net_dev);
|
||||
|
||||
kfree(trigger_data);
|
||||
}
|
||||
}
|
||||
|
||||
static struct led_trigger netdev_led_trigger = {
|
||||
.name = "netdev",
|
||||
.activate = netdev_trig_activate,
|
||||
.deactivate = netdev_trig_deactivate,
|
||||
};
|
||||
|
||||
static int __init netdev_trig_init(void)
|
||||
{
|
||||
return led_trigger_register(&netdev_led_trigger);
|
||||
}
|
||||
|
||||
static void __exit netdev_trig_exit(void)
|
||||
{
|
||||
led_trigger_unregister(&netdev_led_trigger);
|
||||
}
|
||||
|
||||
module_init(netdev_trig_init);
|
||||
module_exit(netdev_trig_exit);
|
||||
|
||||
MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
|
||||
MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
|
||||
MODULE_DESCRIPTION("Netdev LED trigger");
|
||||
MODULE_LICENSE("GPL v2");
|
Loading…
Reference in New Issue
Block a user