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1// SPDX-License-Identifier: GPL-2.0
2// Copyright 2017 Ben Whitten <[email protected]>
3// Copyright 2007 Oliver Jowett <[email protected]>
4//
5// LED Kernel Netdev Trigger
6//
7// Toggles the LED to reflect the link and traffic state of a named net device
8//
9// Derived from ledtrig-timer.c which is:
10// Copyright 2005-2006 Openedhand Ltd.
11// Author: Richard Purdie <[email protected]>
12
13#include <linux/atomic.h>
14#include <linux/ctype.h>
15#include <linux/device.h>
16#include <linux/ethtool.h>
17#include <linux/init.h>
18#include <linux/jiffies.h>
19#include <linux/kernel.h>
20#include <linux/leds.h>
21#include <linux/linkmode.h>
22#include <linux/list.h>
23#include <linux/module.h>
24#include <linux/netdevice.h>
25#include <linux/mutex.h>
26#include <linux/phy.h>
27#include <linux/rtnetlink.h>
28#include <linux/timer.h>
29#include <net/netdev_lock.h>
30#include "../leds.h"
31
32#define NETDEV_LED_DEFAULT_INTERVAL 50
33
34/*
35 * Configurable sysfs attributes:
36 *
37 * device_name - network device name to monitor
38 * interval - duration of LED blink, in milliseconds
39 * link - LED's normal state reflects whether the link is up
40 * (has carrier) or not
41 * tx - LED blinks on transmitted data
42 * rx - LED blinks on receive data
43 * tx_err - LED blinks on transmit error
44 * rx_err - LED blinks on receive error
45 *
46 * Note: If the user selects a mode that is not supported by hw, default
47 * behavior is to fall back to software control of the LED. However not every
48 * hw supports software control. LED callbacks brightness_set() and
49 * brightness_set_blocking() are NULL in this case. hw_control_is_supported()
50 * should use available means supported by hw to inform the user that selected
51 * mode isn't supported by hw. This could be switching off the LED or any
52 * hw blink mode. If software control fallback isn't possible, we return
53 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed
54 * in case an intermediate unsupported mode is necessary to switch from one
55 * supported mode to another.
56 */
57
58struct led_netdev_data {
59 struct mutex lock;
60
61 struct delayed_work work;
62 struct notifier_block notifier;
63
64 struct led_classdev *led_cdev;
65 struct net_device *net_dev;
66
67 char device_name[IFNAMSIZ];
68 atomic_t interval;
69 unsigned int last_activity;
70
71 unsigned long mode;
72 int link_speed;
73 __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes);
74 u8 duplex;
75
76 bool carrier_link_up;
77 bool hw_control;
78};
79
80static const struct attribute_group netdev_trig_link_speed_attrs_group;
81
82static void set_baseline_state(struct led_netdev_data *trigger_data)
83{
84 int current_brightness;
85 struct led_classdev *led_cdev = trigger_data->led_cdev;
86
87 /* Already validated, hw control is possible with the requested mode */
88 if (trigger_data->hw_control) {
89 led_cdev->hw_control_set(led_cdev, trigger_data->mode);
90
91 return;
92 }
93
94 current_brightness = led_cdev->brightness;
95 if (current_brightness)
96 led_cdev->blink_brightness = current_brightness;
97 if (!led_cdev->blink_brightness)
98 led_cdev->blink_brightness = led_cdev->max_brightness;
99
100 if (!trigger_data->carrier_link_up) {
101 led_set_brightness(led_cdev, LED_OFF);
102 } else {
103 bool blink_on = false;
104
105 if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode))
106 blink_on = true;
107
108 if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) &&
109 trigger_data->link_speed == SPEED_10)
110 blink_on = true;
111
112 if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) &&
113 trigger_data->link_speed == SPEED_100)
114 blink_on = true;
115
116 if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) &&
117 trigger_data->link_speed == SPEED_1000)
118 blink_on = true;
119
120 if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) &&
121 trigger_data->link_speed == SPEED_2500)
122 blink_on = true;
123
124 if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) &&
125 trigger_data->link_speed == SPEED_5000)
126 blink_on = true;
127
128 if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) &&
129 trigger_data->link_speed == SPEED_10000)
130 blink_on = true;
131
132 if (test_bit(TRIGGER_NETDEV_LINK_25000, &trigger_data->mode) &&
133 trigger_data->link_speed == SPEED_25000)
134 blink_on = true;
135
136 if (test_bit(TRIGGER_NETDEV_LINK_40000, &trigger_data->mode) &&
137 trigger_data->link_speed == SPEED_40000)
138 blink_on = true;
139
140 if (test_bit(TRIGGER_NETDEV_LINK_50000, &trigger_data->mode) &&
141 trigger_data->link_speed == SPEED_50000)
142 blink_on = true;
143
144 if (test_bit(TRIGGER_NETDEV_LINK_100000, &trigger_data->mode) &&
145 trigger_data->link_speed == SPEED_100000)
146 blink_on = true;
147
148 if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) &&
149 trigger_data->duplex == DUPLEX_HALF)
150 blink_on = true;
151
152 if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) &&
153 trigger_data->duplex == DUPLEX_FULL)
154 blink_on = true;
155
156 if (blink_on)
157 led_set_brightness(led_cdev,
158 led_cdev->blink_brightness);
159 else
160 led_set_brightness(led_cdev, LED_OFF);
161
162 /* If we are looking for RX/TX start periodically
163 * checking stats
164 */
165 if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ||
166 test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ||
167 test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ||
168 test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode))
169 schedule_delayed_work(&trigger_data->work, 0);
170 }
171}
172
173static bool supports_hw_control(struct led_classdev *led_cdev)
174{
175 if (!led_cdev->hw_control_get || !led_cdev->hw_control_set ||
176 !led_cdev->hw_control_is_supported)
177 return false;
178
179 return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name);
180}
181
182/*
183 * Validate the configured netdev is the same as the one associated with
184 * the LED driver in hw control.
185 */
186static bool validate_net_dev(struct led_classdev *led_cdev,
187 struct net_device *net_dev)
188{
189 struct device *dev = led_cdev->hw_control_get_device(led_cdev);
190 struct net_device *ndev;
191
192 if (!dev)
193 return false;
194
195 ndev = to_net_dev(dev);
196
197 return ndev == net_dev;
198}
199
200static bool can_hw_control(struct led_netdev_data *trigger_data)
201{
202 unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);
203 unsigned int interval = atomic_read(&trigger_data->interval);
204 struct led_classdev *led_cdev = trigger_data->led_cdev;
205 int ret;
206
207 if (!supports_hw_control(led_cdev))
208 return false;
209
210 /*
211 * Interval must be set to the default
212 * value. Any different value is rejected if in hw
213 * control.
214 */
215 if (interval != default_interval)
216 return false;
217
218 /*
219 * net_dev must be set with hw control, otherwise no
220 * blinking can be happening and there is nothing to
221 * offloaded. Additionally, for hw control to be
222 * valid, the configured netdev must be the same as
223 * netdev associated to the LED.
224 */
225 if (!validate_net_dev(led_cdev, trigger_data->net_dev))
226 return false;
227
228 /* Check if the requested mode is supported */
229 ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);
230 /* Fall back to software blinking if not supported */
231 if (ret == -EOPNOTSUPP)
232 return false;
233 if (ret) {
234 dev_warn(led_cdev->dev,
235 "Current mode check failed with error %d\n", ret);
236 return false;
237 }
238
239 return true;
240}
241
242static void get_device_state(struct led_netdev_data *trigger_data)
243{
244 struct ethtool_link_ksettings cmd;
245
246 trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
247
248 if (netif_get_link_ksettings(trigger_data->net_dev, &cmd))
249 return;
250
251 if (trigger_data->carrier_link_up) {
252 trigger_data->link_speed = cmd.base.speed;
253 trigger_data->duplex = cmd.base.duplex;
254 }
255
256 /*
257 * Have a local copy of the link speed supported to avoid rtnl lock every time
258 * modes are refreshed on any change event
259 */
260 linkmode_copy(trigger_data->supported_link_modes, cmd.link_modes.supported);
261}
262
263static ssize_t device_name_show(struct device *dev,
264 struct device_attribute *attr, char *buf)
265{
266 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
267 ssize_t len;
268
269 mutex_lock(&trigger_data->lock);
270 len = sprintf(buf, "%s\n", trigger_data->device_name);
271 mutex_unlock(&trigger_data->lock);
272
273 return len;
274}
275
276static int set_device_name(struct led_netdev_data *trigger_data,
277 const char *name, size_t size)
278{
279 struct net_device *new_dev = NULL;
280 char device_name[IFNAMSIZ];
281
282 if (size >= IFNAMSIZ)
283 return -EINVAL;
284
285 cancel_delayed_work_sync(&trigger_data->work);
286
287 memcpy(device_name, name, size);
288 device_name[size] = 0;
289 if (size > 0 && device_name[size - 1] == '\n')
290 device_name[size - 1] = 0;
291
292 /*
293 * Lock order: rtnl_lock -> netdev instance lock -> trigger_data lock.
294 */
295 rtnl_lock();
296 if (device_name[0]) {
297 new_dev = dev_get_by_name(&init_net, device_name);
298 if (new_dev)
299 netdev_lock_ops(new_dev);
300 }
301 mutex_lock(&trigger_data->lock);
302
303 dev_put(trigger_data->net_dev);
304 trigger_data->net_dev = new_dev;
305 strscpy(trigger_data->device_name, device_name);
306
307 trigger_data->carrier_link_up = false;
308 trigger_data->link_speed = SPEED_UNKNOWN;
309 trigger_data->duplex = DUPLEX_UNKNOWN;
310 if (trigger_data->net_dev)
311 get_device_state(trigger_data);
312
313 trigger_data->last_activity = 0;
314
315 /* Skip if we're called from netdev_trig_activate() and hw_control is true */
316 if (!trigger_data->hw_control || led_get_trigger_data(trigger_data->led_cdev))
317 set_baseline_state(trigger_data);
318
319 mutex_unlock(&trigger_data->lock);
320 if (new_dev)
321 netdev_unlock_ops(new_dev);
322 rtnl_unlock();
323
324 return 0;
325}
326
327static ssize_t device_name_store(struct device *dev,
328 struct device_attribute *attr, const char *buf,
329 size_t size)
330{
331 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
332 int ret;
333
334 ret = set_device_name(trigger_data, buf, size);
335
336 if (ret < 0)
337 return ret;
338
339 /* Refresh link_speed visibility */
340 sysfs_update_group(&dev->kobj, &netdev_trig_link_speed_attrs_group);
341
342 return size;
343}
344
345static DEVICE_ATTR_RW(device_name);
346
347static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
348 enum led_trigger_netdev_modes attr)
349{
350 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
351 int bit;
352
353 switch (attr) {
354 case TRIGGER_NETDEV_LINK:
355 case TRIGGER_NETDEV_LINK_10:
356 case TRIGGER_NETDEV_LINK_100:
357 case TRIGGER_NETDEV_LINK_1000:
358 case TRIGGER_NETDEV_LINK_2500:
359 case TRIGGER_NETDEV_LINK_5000:
360 case TRIGGER_NETDEV_LINK_10000:
361 case TRIGGER_NETDEV_LINK_25000:
362 case TRIGGER_NETDEV_LINK_40000:
363 case TRIGGER_NETDEV_LINK_50000:
364 case TRIGGER_NETDEV_LINK_100000:
365 case TRIGGER_NETDEV_HALF_DUPLEX:
366 case TRIGGER_NETDEV_FULL_DUPLEX:
367 case TRIGGER_NETDEV_TX:
368 case TRIGGER_NETDEV_RX:
369 case TRIGGER_NETDEV_TX_ERR:
370 case TRIGGER_NETDEV_RX_ERR:
371 bit = attr;
372 break;
373 default:
374 return -EINVAL;
375 }
376
377 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode));
378}
379
380static ssize_t netdev_led_attr_store(struct device *dev, const char *buf,
381 size_t size, enum led_trigger_netdev_modes attr)
382{
383 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
384 struct led_classdev *led_cdev = trigger_data->led_cdev;
385 unsigned long state, mode = trigger_data->mode;
386 int ret;
387 int bit;
388
389 ret = kstrtoul(buf, 0, &state);
390 if (ret)
391 return ret;
392
393 switch (attr) {
394 case TRIGGER_NETDEV_LINK:
395 case TRIGGER_NETDEV_LINK_10:
396 case TRIGGER_NETDEV_LINK_100:
397 case TRIGGER_NETDEV_LINK_1000:
398 case TRIGGER_NETDEV_LINK_2500:
399 case TRIGGER_NETDEV_LINK_5000:
400 case TRIGGER_NETDEV_LINK_10000:
401 case TRIGGER_NETDEV_LINK_25000:
402 case TRIGGER_NETDEV_LINK_40000:
403 case TRIGGER_NETDEV_LINK_50000:
404 case TRIGGER_NETDEV_LINK_100000:
405 case TRIGGER_NETDEV_HALF_DUPLEX:
406 case TRIGGER_NETDEV_FULL_DUPLEX:
407 case TRIGGER_NETDEV_TX:
408 case TRIGGER_NETDEV_RX:
409 case TRIGGER_NETDEV_TX_ERR:
410 case TRIGGER_NETDEV_RX_ERR:
411 bit = attr;
412 break;
413 default:
414 return -EINVAL;
415 }
416
417 if (state)
418 set_bit(bit, &mode);
419 else
420 clear_bit(bit, &mode);
421
422 if (test_bit(TRIGGER_NETDEV_LINK, &mode) &&
423 (test_bit(TRIGGER_NETDEV_LINK_10, &mode) ||
424 test_bit(TRIGGER_NETDEV_LINK_100, &mode) ||
425 test_bit(TRIGGER_NETDEV_LINK_1000, &mode) ||
426 test_bit(TRIGGER_NETDEV_LINK_2500, &mode) ||
427 test_bit(TRIGGER_NETDEV_LINK_5000, &mode) ||
428 test_bit(TRIGGER_NETDEV_LINK_10000, &mode) ||
429 test_bit(TRIGGER_NETDEV_LINK_25000, &mode) ||
430 test_bit(TRIGGER_NETDEV_LINK_40000, &mode) ||
431 test_bit(TRIGGER_NETDEV_LINK_50000, &mode) ||
432 test_bit(TRIGGER_NETDEV_LINK_100000, &mode)))
433 return -EINVAL;
434
435 cancel_delayed_work_sync(&trigger_data->work);
436
437 trigger_data->mode = mode;
438 trigger_data->hw_control = can_hw_control(trigger_data);
439
440 if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking &&
441 !trigger_data->hw_control)
442 return -EOPNOTSUPP;
443
444 set_baseline_state(trigger_data);
445
446 return size;
447}
448
449#define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \
450 static ssize_t trigger_name##_show(struct device *dev, \
451 struct device_attribute *attr, char *buf) \
452 { \
453 return netdev_led_attr_show(dev, buf, trigger); \
454 } \
455 static ssize_t trigger_name##_store(struct device *dev, \
456 struct device_attribute *attr, const char *buf, size_t size) \
457 { \
458 return netdev_led_attr_store(dev, buf, size, trigger); \
459 } \
460 static DEVICE_ATTR_RW(trigger_name)
461
462DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK);
463DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10);
464DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100);
465DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000);
466DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500);
467DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000);
468DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000);
469DEFINE_NETDEV_TRIGGER(link_25000, TRIGGER_NETDEV_LINK_25000);
470DEFINE_NETDEV_TRIGGER(link_40000, TRIGGER_NETDEV_LINK_40000);
471DEFINE_NETDEV_TRIGGER(link_50000, TRIGGER_NETDEV_LINK_50000);
472DEFINE_NETDEV_TRIGGER(link_100000, TRIGGER_NETDEV_LINK_100000);
473DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX);
474DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX);
475DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX);
476DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX);
477DEFINE_NETDEV_TRIGGER(tx_err, TRIGGER_NETDEV_TX_ERR);
478DEFINE_NETDEV_TRIGGER(rx_err, TRIGGER_NETDEV_RX_ERR);
479
480static ssize_t interval_show(struct device *dev,
481 struct device_attribute *attr, char *buf)
482{
483 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
484
485 return sprintf(buf, "%u\n",
486 jiffies_to_msecs(atomic_read(&trigger_data->interval)));
487}
488
489static ssize_t interval_store(struct device *dev,
490 struct device_attribute *attr, const char *buf,
491 size_t size)
492{
493 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
494 unsigned long value;
495 int ret;
496
497 if (trigger_data->hw_control)
498 return -EINVAL;
499
500 ret = kstrtoul(buf, 0, &value);
501 if (ret)
502 return ret;
503
504 /* impose some basic bounds on the timer interval */
505 if (value >= 5 && value <= 10000) {
506 cancel_delayed_work_sync(&trigger_data->work);
507
508 atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
509 set_baseline_state(trigger_data); /* resets timer */
510 }
511
512 return size;
513}
514
515static DEVICE_ATTR_RW(interval);
516
517static ssize_t offloaded_show(struct device *dev,
518 struct device_attribute *attr, char *buf)
519{
520 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
521
522 return sprintf(buf, "%d\n", trigger_data->hw_control);
523}
524
525static DEVICE_ATTR_RO(offloaded);
526
527#define CHECK_LINK_MODE_ATTR(link_speed) \
528 do { \
529 if (attr == &dev_attr_link_##link_speed.attr && \
530 link_ksettings.base.speed == SPEED_##link_speed) \
531 return attr->mode; \
532 } while (0)
533
534static umode_t netdev_trig_link_speed_visible(struct kobject *kobj,
535 struct attribute *attr, int n)
536{
537 struct device *dev = kobj_to_dev(kobj);
538 struct led_netdev_data *trigger_data;
539 unsigned long *supported_link_modes;
540 u32 mode;
541
542 trigger_data = led_trigger_get_drvdata(dev);
543 supported_link_modes = trigger_data->supported_link_modes;
544
545 /*
546 * Search in the supported link mode mask a matching supported mode.
547 * Stop at the first matching entry as we care only to check if a particular
548 * speed is supported and not the kind.
549 */
550 for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) {
551 struct ethtool_link_ksettings link_ksettings;
552
553 ethtool_params_from_link_mode(&link_ksettings, mode);
554
555 CHECK_LINK_MODE_ATTR(10);
556 CHECK_LINK_MODE_ATTR(100);
557 CHECK_LINK_MODE_ATTR(1000);
558 CHECK_LINK_MODE_ATTR(2500);
559 CHECK_LINK_MODE_ATTR(5000);
560 CHECK_LINK_MODE_ATTR(10000);
561 CHECK_LINK_MODE_ATTR(25000);
562 CHECK_LINK_MODE_ATTR(40000);
563 CHECK_LINK_MODE_ATTR(50000);
564 CHECK_LINK_MODE_ATTR(100000);
565 }
566
567 return 0;
568}
569
570static struct attribute *netdev_trig_link_speed_attrs[] = {
571 &dev_attr_link_10.attr,
572 &dev_attr_link_100.attr,
573 &dev_attr_link_1000.attr,
574 &dev_attr_link_2500.attr,
575 &dev_attr_link_5000.attr,
576 &dev_attr_link_10000.attr,
577 &dev_attr_link_25000.attr,
578 &dev_attr_link_40000.attr,
579 &dev_attr_link_50000.attr,
580 &dev_attr_link_100000.attr,
581 NULL
582};
583
584static const struct attribute_group netdev_trig_link_speed_attrs_group = {
585 .attrs = netdev_trig_link_speed_attrs,
586 .is_visible = netdev_trig_link_speed_visible,
587};
588
589static struct attribute *netdev_trig_attrs[] = {
590 &dev_attr_device_name.attr,
591 &dev_attr_link.attr,
592 &dev_attr_full_duplex.attr,
593 &dev_attr_half_duplex.attr,
594 &dev_attr_rx.attr,
595 &dev_attr_tx.attr,
596 &dev_attr_rx_err.attr,
597 &dev_attr_tx_err.attr,
598 &dev_attr_interval.attr,
599 &dev_attr_offloaded.attr,
600 NULL
601};
602
603static const struct attribute_group netdev_trig_attrs_group = {
604 .attrs = netdev_trig_attrs,
605};
606
607static const struct attribute_group *netdev_trig_groups[] = {
608 &netdev_trig_attrs_group,
609 &netdev_trig_link_speed_attrs_group,
610 NULL,
611};
612
613static int netdev_trig_notify(struct notifier_block *nb,
614 unsigned long evt, void *dv)
615{
616 struct net_device *dev =
617 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv);
618 struct led_netdev_data *trigger_data =
619 container_of(nb, struct led_netdev_data, notifier);
620 struct led_classdev *led_cdev = trigger_data->led_cdev;
621
622 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
623 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
624 && evt != NETDEV_CHANGENAME)
625 return NOTIFY_DONE;
626
627 if (!(dev == trigger_data->net_dev ||
628 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) ||
629 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name))))
630 return NOTIFY_DONE;
631
632 cancel_delayed_work_sync(&trigger_data->work);
633
634 mutex_lock(&trigger_data->lock);
635
636 trigger_data->carrier_link_up = false;
637 trigger_data->link_speed = SPEED_UNKNOWN;
638 trigger_data->duplex = DUPLEX_UNKNOWN;
639 switch (evt) {
640 case NETDEV_CHANGENAME:
641 case NETDEV_REGISTER:
642 dev_put(trigger_data->net_dev);
643 dev_hold(dev);
644 trigger_data->net_dev = dev;
645 if (evt == NETDEV_CHANGENAME)
646 get_device_state(trigger_data);
647 break;
648 case NETDEV_UNREGISTER:
649 dev_put(trigger_data->net_dev);
650 trigger_data->net_dev = NULL;
651 break;
652 case NETDEV_UP:
653 trigger_data->hw_control = can_hw_control(trigger_data);
654 fallthrough;
655 case NETDEV_CHANGE:
656 get_device_state(trigger_data);
657 /* Refresh link_speed visibility */
658 if (evt == NETDEV_CHANGE)
659 sysfs_update_group(&led_cdev->dev->kobj,
660 &netdev_trig_link_speed_attrs_group);
661 break;
662 }
663
664 set_baseline_state(trigger_data);
665
666 mutex_unlock(&trigger_data->lock);
667
668 return NOTIFY_DONE;
669}
670
671/* here's the real work! */
672static void netdev_trig_work(struct work_struct *work)
673{
674 struct led_netdev_data *trigger_data =
675 container_of(work, struct led_netdev_data, work.work);
676 struct rtnl_link_stats64 *dev_stats;
677 unsigned int new_activity;
678 struct rtnl_link_stats64 temp;
679 unsigned long interval;
680 int invert;
681
682 /* If we dont have a device, insure we are off */
683 if (!trigger_data->net_dev) {
684 led_set_brightness(trigger_data->led_cdev, LED_OFF);
685 return;
686 }
687
688 /* If we are not looking for RX/TX then return */
689 if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) &&
690 !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) &&
691 !test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) &&
692 !test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode))
693 return;
694
695 dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
696 new_activity =
697 (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ?
698 dev_stats->tx_packets : 0) +
699 (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ?
700 dev_stats->rx_packets : 0) +
701 (test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ?
702 dev_stats->tx_errors : 0) +
703 (test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode) ?
704 dev_stats->rx_errors : 0);
705
706 if (trigger_data->last_activity != new_activity) {
707 led_stop_software_blink(trigger_data->led_cdev);
708
709 invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) ||
710 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) ||
711 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) ||
712 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) ||
713 test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) ||
714 test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) ||
715 test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) ||
716 test_bit(TRIGGER_NETDEV_LINK_25000, &trigger_data->mode) ||
717 test_bit(TRIGGER_NETDEV_LINK_40000, &trigger_data->mode) ||
718 test_bit(TRIGGER_NETDEV_LINK_50000, &trigger_data->mode) ||
719 test_bit(TRIGGER_NETDEV_LINK_100000, &trigger_data->mode) ||
720 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) ||
721 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode);
722 interval = jiffies_to_msecs(
723 atomic_read(&trigger_data->interval));
724 /* base state is ON (link present) */
725 led_blink_set_oneshot(trigger_data->led_cdev,
726 &interval,
727 &interval,
728 invert);
729 trigger_data->last_activity = new_activity;
730 }
731
732 schedule_delayed_work(&trigger_data->work,
733 (atomic_read(&trigger_data->interval)*2));
734}
735
736static int netdev_trig_activate(struct led_classdev *led_cdev)
737{
738 struct led_netdev_data *trigger_data;
739 unsigned long mode = 0;
740 struct device *dev;
741 int rc;
742
743 trigger_data = kzalloc_obj(struct led_netdev_data);
744 if (!trigger_data)
745 return -ENOMEM;
746
747 mutex_init(&trigger_data->lock);
748
749 trigger_data->notifier.notifier_call = netdev_trig_notify;
750 trigger_data->notifier.priority = 10;
751
752 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work);
753
754 trigger_data->led_cdev = led_cdev;
755 trigger_data->net_dev = NULL;
756 trigger_data->device_name[0] = 0;
757
758 trigger_data->mode = 0;
759 atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
760 trigger_data->last_activity = 0;
761
762 /* Check if hw control is active by default on the LED.
763 * Init already enabled mode in hw control.
764 */
765 if (supports_hw_control(led_cdev)) {
766 dev = led_cdev->hw_control_get_device(led_cdev);
767 if (dev) {
768 const char *name = dev_name(dev);
769
770 trigger_data->hw_control = true;
771 set_device_name(trigger_data, name, strlen(name));
772
773 rc = led_cdev->hw_control_get(led_cdev, &mode);
774 if (!rc)
775 trigger_data->mode = mode;
776 }
777 }
778
779 led_set_trigger_data(led_cdev, trigger_data);
780
781 rc = register_netdevice_notifier(&trigger_data->notifier);
782 if (rc)
783 kfree(trigger_data);
784
785 return rc;
786}
787
788static void netdev_trig_deactivate(struct led_classdev *led_cdev)
789{
790 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev);
791
792 unregister_netdevice_notifier(&trigger_data->notifier);
793
794 cancel_delayed_work_sync(&trigger_data->work);
795
796 dev_put(trigger_data->net_dev);
797
798 kfree(trigger_data);
799}
800
801static struct led_trigger netdev_led_trigger = {
802 .name = "netdev",
803 .activate = netdev_trig_activate,
804 .deactivate = netdev_trig_deactivate,
805 .groups = netdev_trig_groups,
806};
807
808module_led_trigger(netdev_led_trigger);
809
810MODULE_AUTHOR("Ben Whitten <[email protected]>");
811MODULE_AUTHOR("Oliver Jowett <[email protected]>");
812MODULE_DESCRIPTION("Netdev LED trigger");
813MODULE_LICENSE("GPL v2");
814MODULE_ALIAS("ledtrig:netdev");