463 lines
11 KiB
C
463 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
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// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
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//
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// LED Kernel Netdev Trigger
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//
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// Toggles the LED to reflect the link and traffic state of a named net device
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//
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// Derived from ledtrig-timer.c which is:
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// Copyright 2005-2006 Openedhand Ltd.
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// Author: Richard Purdie <rpurdie@openedhand.com>
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#include <linux/atomic.h>
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#include <linux/ctype.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include "../leds.h"
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/*
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* Configurable sysfs attributes:
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*
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* device_name - network device name to monitor
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* interval - duration of LED blink, in milliseconds
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* link - LED's normal state reflects whether the link is up
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* (has carrier) or not
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* tx - LED blinks on transmitted data
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* rx - LED blinks on receive data
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*
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*/
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struct led_netdev_data {
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spinlock_t lock;
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struct delayed_work work;
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struct notifier_block notifier;
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struct led_classdev *led_cdev;
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struct net_device *net_dev;
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char device_name[IFNAMSIZ];
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atomic_t interval;
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unsigned int last_activity;
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unsigned long mode;
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#define NETDEV_LED_LINK 0
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#define NETDEV_LED_TX 1
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#define NETDEV_LED_RX 2
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#define NETDEV_LED_MODE_LINKUP 3
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};
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enum netdev_led_attr {
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NETDEV_ATTR_LINK,
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NETDEV_ATTR_TX,
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NETDEV_ATTR_RX
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};
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static void set_baseline_state(struct led_netdev_data *trigger_data)
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{
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int current_brightness;
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struct led_classdev *led_cdev = trigger_data->led_cdev;
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current_brightness = led_cdev->brightness;
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if (current_brightness)
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led_cdev->blink_brightness = current_brightness;
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if (!led_cdev->blink_brightness)
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led_cdev->blink_brightness = led_cdev->max_brightness;
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if (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
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led_set_brightness(led_cdev, LED_OFF);
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else {
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if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
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led_set_brightness(led_cdev,
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led_cdev->blink_brightness);
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else
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led_set_brightness(led_cdev, LED_OFF);
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/* If we are looking for RX/TX start periodically
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* checking stats
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*/
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if (test_bit(NETDEV_LED_TX, &trigger_data->mode) ||
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test_bit(NETDEV_LED_RX, &trigger_data->mode))
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schedule_delayed_work(&trigger_data->work, 0);
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}
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}
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static ssize_t device_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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ssize_t len;
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spin_lock_bh(&trigger_data->lock);
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len = sprintf(buf, "%s\n", trigger_data->device_name);
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spin_unlock_bh(&trigger_data->lock);
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return len;
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}
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static ssize_t device_name_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t size)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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if (size >= IFNAMSIZ)
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return -EINVAL;
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cancel_delayed_work_sync(&trigger_data->work);
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spin_lock_bh(&trigger_data->lock);
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if (trigger_data->net_dev) {
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dev_put(trigger_data->net_dev);
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trigger_data->net_dev = NULL;
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}
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memcpy(trigger_data->device_name, buf, size);
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trigger_data->device_name[size] = 0;
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if (size > 0 && trigger_data->device_name[size - 1] == '\n')
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trigger_data->device_name[size - 1] = 0;
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if (trigger_data->device_name[0] != 0)
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trigger_data->net_dev =
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dev_get_by_name(&init_net, trigger_data->device_name);
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clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
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if (trigger_data->net_dev != NULL)
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if (netif_carrier_ok(trigger_data->net_dev))
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set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
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trigger_data->last_activity = 0;
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set_baseline_state(trigger_data);
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spin_unlock_bh(&trigger_data->lock);
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return size;
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}
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static DEVICE_ATTR_RW(device_name);
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static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
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enum netdev_led_attr attr)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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int bit;
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switch (attr) {
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case NETDEV_ATTR_LINK:
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bit = NETDEV_LED_LINK;
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break;
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case NETDEV_ATTR_TX:
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bit = NETDEV_LED_TX;
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break;
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case NETDEV_ATTR_RX:
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bit = NETDEV_LED_RX;
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break;
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default:
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return -EINVAL;
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}
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return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
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}
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static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
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size_t size, enum netdev_led_attr attr)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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unsigned long state;
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int ret;
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int bit;
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ret = kstrtoul(buf, 0, &state);
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if (ret)
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return ret;
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switch (attr) {
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case NETDEV_ATTR_LINK:
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bit = NETDEV_LED_LINK;
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break;
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case NETDEV_ATTR_TX:
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bit = NETDEV_LED_TX;
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break;
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case NETDEV_ATTR_RX:
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bit = NETDEV_LED_RX;
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break;
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default:
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return -EINVAL;
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}
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cancel_delayed_work_sync(&trigger_data->work);
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if (state)
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set_bit(bit, &trigger_data->mode);
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else
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clear_bit(bit, &trigger_data->mode);
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set_baseline_state(trigger_data);
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return size;
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}
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static ssize_t link_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
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}
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static ssize_t link_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
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}
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static DEVICE_ATTR_RW(link);
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static ssize_t tx_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
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}
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static ssize_t tx_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
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}
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static DEVICE_ATTR_RW(tx);
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static ssize_t rx_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
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}
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static ssize_t rx_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
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}
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static DEVICE_ATTR_RW(rx);
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static ssize_t interval_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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return sprintf(buf, "%u\n",
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jiffies_to_msecs(atomic_read(&trigger_data->interval)));
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}
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static ssize_t interval_store(struct device *dev,
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struct device_attribute *attr, const char *buf,
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size_t size)
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{
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struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
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unsigned long value;
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int ret;
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ret = kstrtoul(buf, 0, &value);
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if (ret)
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return ret;
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/* impose some basic bounds on the timer interval */
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if (value >= 5 && value <= 10000) {
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cancel_delayed_work_sync(&trigger_data->work);
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atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
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set_baseline_state(trigger_data); /* resets timer */
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}
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return size;
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}
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static DEVICE_ATTR_RW(interval);
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static struct attribute *netdev_trig_attrs[] = {
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&dev_attr_device_name.attr,
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&dev_attr_link.attr,
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&dev_attr_rx.attr,
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&dev_attr_tx.attr,
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&dev_attr_interval.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(netdev_trig);
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static int netdev_trig_notify(struct notifier_block *nb,
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unsigned long evt, void *dv)
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{
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struct net_device *dev =
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netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
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struct led_netdev_data *trigger_data =
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container_of(nb, struct led_netdev_data, notifier);
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if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
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&& evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
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&& evt != NETDEV_CHANGENAME)
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return NOTIFY_DONE;
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if (!(dev == trigger_data->net_dev ||
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(evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
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(evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
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return NOTIFY_DONE;
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cancel_delayed_work_sync(&trigger_data->work);
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spin_lock_bh(&trigger_data->lock);
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clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
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switch (evt) {
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case NETDEV_CHANGENAME:
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case NETDEV_REGISTER:
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if (trigger_data->net_dev)
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dev_put(trigger_data->net_dev);
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dev_hold(dev);
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trigger_data->net_dev = dev;
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break;
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case NETDEV_UNREGISTER:
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dev_put(trigger_data->net_dev);
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trigger_data->net_dev = NULL;
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break;
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case NETDEV_UP:
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case NETDEV_CHANGE:
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if (netif_carrier_ok(dev))
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set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
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break;
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}
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set_baseline_state(trigger_data);
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spin_unlock_bh(&trigger_data->lock);
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return NOTIFY_DONE;
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}
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/* here's the real work! */
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static void netdev_trig_work(struct work_struct *work)
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{
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struct led_netdev_data *trigger_data =
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container_of(work, struct led_netdev_data, work.work);
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struct rtnl_link_stats64 *dev_stats;
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unsigned int new_activity;
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struct rtnl_link_stats64 temp;
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unsigned long interval;
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int invert;
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/* If we dont have a device, insure we are off */
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if (!trigger_data->net_dev) {
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led_set_brightness(trigger_data->led_cdev, LED_OFF);
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return;
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}
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/* If we are not looking for RX/TX then return */
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if (!test_bit(NETDEV_LED_TX, &trigger_data->mode) &&
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!test_bit(NETDEV_LED_RX, &trigger_data->mode))
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return;
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dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
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new_activity =
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(test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
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dev_stats->tx_packets : 0) +
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(test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
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dev_stats->rx_packets : 0);
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if (trigger_data->last_activity != new_activity) {
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led_stop_software_blink(trigger_data->led_cdev);
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invert = test_bit(NETDEV_LED_LINK, &trigger_data->mode);
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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 int 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 -ENOMEM;
|
||
|
|
|
||
|
|
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_set_trigger_data(led_cdev, trigger_data);
|
||
|
|
|
||
|
|
rc = register_netdevice_notifier(&trigger_data->notifier);
|
||
|
|
if (rc)
|
||
|
|
kfree(trigger_data);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void netdev_trig_deactivate(struct led_classdev *led_cdev)
|
||
|
|
{
|
||
|
|
struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
|
||
|
|
|
||
|
|
unregister_netdevice_notifier(&trigger_data->notifier);
|
||
|
|
|
||
|
|
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,
|
||
|
|
.groups = netdev_trig_groups,
|
||
|
|
};
|
||
|
|
|
||
|
|
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");
|