src/patches/linux-3.2.33-ledtrig-netdev-1.patch

   1 diff -Naur linux-3.2.33.org/drivers/leds/Kconfig linux-3.2.33/drivers/leds/Kconfig
   2 --- linux-3.2.33.org/drivers/leds/Kconfig       2012-10-31 00:27:11.000000000 +0100
   3 +++ linux-3.2.33/drivers/leds/Kconfig   2012-11-04 12:47:10.661589825 +0100
   4 @@ -457,4 +457,11 @@
   5  comment "iptables trigger is under Netfilter config (LED target)"
   6         depends on LEDS_TRIGGERS
   7
   8 +config LEDS_TRIGGER_NETDEV
   9 +       tristate "LED Netdev Trigger"
  10 +       depends on LEDS_TRIGGERS
  11 +       help
  12 +         This allows LEDs to be controlled by network device activity.
  13 +         If unsure, say Y.
  14 +
  15  endif # NEW_LEDS
  16 diff -Naur linux-3.2.33.org/drivers/leds/ledtrig-netdev.c linux-3.2.33/drivers/leds/ledtrig-netdev.c
  17 --- linux-3.2.33.org/drivers/leds/ledtrig-netdev.c      1970-01-01 01:00:00.000000000 +0100
  18 +++ linux-3.2.33/drivers/leds/ledtrig-netdev.c  2012-11-04 13:43:51.414865799 +0100
  19 @@ -0,0 +1,452 @@
  20 +/*
  21 + * LED Kernel Netdev Trigger
  22 + *
  23 + * Toggles the LED to reflect the link and traffic state of a named net device
  24 + *
  25 + * Copyright 2007 Oliver Jowett <oliver@opencloud.com>
  26 + *
  27 + * Derived from ledtrig-timer.c which is:
  28 + *  Copyright 2005-2006 Openedhand Ltd.
  29 + *  Author: Richard Purdie <rpurdie@openedhand.com>
  30 + *
  31 + * This program is free software; you can redistribute it and/or modify
  32 + * it under the terms of the GNU General Public License version 2 as
  33 + * published by the Free Software Foundation.
  34 + *
  35 + */
  36 +
  37 +#include <linux/module.h>
  38 +#include <linux/jiffies.h>
  39 +#include <linux/kernel.h>
  40 +#include <linux/init.h>
  41 +#include <linux/list.h>
  42 +#include <linux/spinlock.h>
  43 +#include <linux/device.h>
  44 +#include <linux/sysdev.h>
  45 +#include <linux/netdevice.h>
  46 +#include <linux/timer.h>
  47 +#include <linux/ctype.h>
  48 +#include <linux/leds.h>
  49 +#include <linux/version.h>
  50 +
  51 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
  52 +#include <net/net_namespace.h>
  53 +#endif
  54 +
  55 +#include "leds.h"
  56 +
  57 +/*
  58 + * Configurable sysfs attributes:
  59 + *
  60 + * device_name - network device name to monitor
  61 + *
  62 + * interval - duration of LED blink, in milliseconds
  63 + *
  64 + * mode - either "none" (LED is off) or a space separated list of one or more of:
  65 + *   link: LED's normal state reflects whether the link is up (has carrier) or not
  66 + *   tx:   LED blinks on transmitted data
  67 + *   rx:   LED blinks on receive data
  68 + *
  69 + * Some suggestions:
  70 + *
  71 + *  Simple link status LED:
  72 + *  $ echo netdev >someled/trigger
  73 + *  $ echo eth0 >someled/device_name
  74 + *  $ echo link >someled/mode
  75 + *
  76 + *  Ethernet-style link/activity LED:
  77 + *  $ echo netdev >someled/trigger
  78 + *  $ echo eth0 >someled/device_name
  79 + *  $ echo "link tx rx" >someled/mode
  80 + *
  81 + *  Modem-style tx/rx LEDs:
  82 + *  $ echo netdev >led1/trigger
  83 + *  $ echo ppp0 >led1/device_name
  84 + *  $ echo tx >led1/mode
  85 + *  $ echo netdev >led2/trigger
  86 + *  $ echo ppp0 >led2/device_name
  87 + *  $ echo rx >led2/mode
  88 + *
  89 + */
  90 +
  91 +#define MODE_LINK 1
  92 +#define MODE_TX   2
  93 +#define MODE_RX   4
  94 +
  95 +struct led_netdev_data {
  96 +       rwlock_t lock;
  97 +
  98 +       struct timer_list timer;
  99 +       struct notifier_block notifier;
 100 +
 101 +       struct led_classdev *led_cdev;
 102 +       struct net_device *net_dev;
 103 +
 104 +       char device_name[IFNAMSIZ];
 105 +       unsigned interval;
 106 +       unsigned mode;
 107 +       unsigned link_up;
 108 +       unsigned last_activity;
 109 +};
 110 +
 111 +static void set_baseline_state(struct led_netdev_data *trigger_data)
 112 +{
 113 +       if ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up)
 114 +               led_set_brightness(trigger_data->led_cdev, LED_FULL);
 115 +       else
 116 +               led_set_brightness(trigger_data->led_cdev, LED_OFF);
 117 +
 118 +       if ((trigger_data->mode & (MODE_TX | MODE_RX)) != 0 && trigger_data->link_up)
 119 +               mod_timer(&trigger_data->timer, jiffies + trigger_data->interval);
 120 +       else
 121 +               del_timer(&trigger_data->timer);
 122 +}
 123 +
 124 +static ssize_t led_device_name_show(struct device *dev,
 125 +                                   struct device_attribute *attr, char *buf)
 126 +{
 127 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 128 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 129 +
 130 +       read_lock(&trigger_data->lock);
 131 +       sprintf(buf, "%s\n", trigger_data->device_name);
 132 +       read_unlock(&trigger_data->lock);
 133 +
 134 +       return strlen(buf) + 1;
 135 +}
 136 +
 137 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)
 138 +extern struct net init_net;
 139 +#endif
 140 +
 141 +static ssize_t led_device_name_store(struct device *dev,
 142 +                                    struct device_attribute *attr, const char *buf, size_t size)
 143 +{
 144 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 145 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 146 +
 147 +       if (size < 0 || size >= IFNAMSIZ)
 148 +               return -EINVAL;
 149 +
 150 +       write_lock(&trigger_data->lock);
 151 +
 152 +       strcpy(trigger_data->device_name, buf);
 153 +       if (size > 0 && trigger_data->device_name[size-1] == '\n')
 154 +               trigger_data->device_name[size-1] = 0;
 155 +
 156 +       if (trigger_data->device_name[0] != 0) {
 157 +               /* check for existing device to update from */
 158 +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
 159 +               trigger_data->net_dev = dev_get_by_name(&init_net, trigger_data->device_name);
 160 +#else
 161 +               trigger_data->net_dev = dev_get_by_name(trigger_data->device_name);
 162 +#endif
 163 +               if (trigger_data->net_dev != NULL)
 164 +                       trigger_data->link_up = (dev_get_flags(trigger_data->net_dev) & IFF_LOWER_UP) != 0;
 165 +               set_baseline_state(trigger_data); /* updates LEDs, may start timers */
 166 +       }
 167 +
 168 +       write_unlock(&trigger_data->lock);
 169 +       return size;
 170 +}
 171 +
 172 +static DEVICE_ATTR(device_name, 0644, led_device_name_show, led_device_name_store);
 173 +
 174 +static ssize_t led_mode_show(struct device *dev,
 175 +                            struct device_attribute *attr, char *buf)
 176 +{
 177 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 178 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 179 +
 180 +       read_lock(&trigger_data->lock);
 181 +
 182 +       if (trigger_data->mode == 0) {
 183 +               strcpy(buf, "none\n");
 184 +       } else {
 185 +               if (trigger_data->mode & MODE_LINK)
 186 +                       strcat(buf, "link ");
 187 +               if (trigger_data->mode & MODE_TX)
 188 +                       strcat(buf, "tx ");
 189 +               if (trigger_data->mode & MODE_RX)
 190 +                       strcat(buf, "rx ");
 191 +               strcat(buf, "\n");
 192 +       }
 193 +
 194 +       read_unlock(&trigger_data->lock);
 195 +
 196 +       return strlen(buf)+1;
 197 +}
 198 +
 199 +static ssize_t led_mode_store(struct device *dev,
 200 +                             struct device_attribute *attr, const char *buf, size_t size)
 201 +{
 202 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 203 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 204 +       char copybuf[1024];
 205 +       int new_mode = -1;
 206 +       char *p, *token;
 207 +
 208 +       /* take a copy since we don't want to trash the inbound buffer when using strsep */
 209 +       strncpy(copybuf, buf, sizeof(copybuf));
 210 +       copybuf[1023] = 0;
 211 +       p = copybuf;
 212 +
 213 +       while ((token = strsep(&p, " \t\n")) != NULL) {
 214 +               if (!*token)
 215 +                       continue;
 216 +
 217 +               if (new_mode == -1)
 218 +                       new_mode = 0;
 219 +
 220 +               if (!strcmp(token, "none"))
 221 +                       new_mode = 0;
 222 +               else if (!strcmp(token, "tx"))
 223 +                       new_mode |= MODE_TX;
 224 +               else if (!strcmp(token, "rx"))
 225 +                       new_mode |= MODE_RX;
 226 +               else if (!strcmp(token, "link"))
 227 +                       new_mode |= MODE_LINK;
 228 +               else
 229 +                       return -EINVAL;
 230 +       }
 231 +
 232 +       if (new_mode == -1)
 233 +               return -EINVAL;
 234 +
 235 +       write_lock(&trigger_data->lock);
 236 +       trigger_data->mode = new_mode;
 237 +       set_baseline_state(trigger_data);
 238 +       write_unlock(&trigger_data->lock);
 239 +
 240 +       return size;
 241 +}
 242 +
 243 +static DEVICE_ATTR(mode, 0644, led_mode_show, led_mode_store);
 244 +
 245 +static ssize_t led_interval_show(struct device *dev,
 246 +                                struct device_attribute *attr, char *buf)
 247 +{
 248 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 249 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 250 +
 251 +       read_lock(&trigger_data->lock);
 252 +       sprintf(buf, "%u\n", jiffies_to_msecs(trigger_data->interval));
 253 +       read_unlock(&trigger_data->lock);
 254 +
 255 +       return strlen(buf) + 1;
 256 +}
 257 +
 258 +static ssize_t led_interval_store(struct device *dev,
 259 +                                 struct device_attribute *attr, const char *buf, size_t size)
 260 +{
 261 +       struct led_classdev *led_cdev = dev_get_drvdata(dev);
 262 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 263 +       int ret = -EINVAL;
 264 +       char *after;
 265 +       unsigned long value = simple_strtoul(buf, &after, 10);
 266 +       size_t count = after - buf;
 267 +
 268 +       if (*after && isspace(*after))
 269 +               count++;
 270 +
 271 +       /* impose some basic bounds on the timer interval */
 272 +       if (count == size && value >= 5 && value <= 10000) {
 273 +               write_lock(&trigger_data->lock);
 274 +               trigger_data->interval = msecs_to_jiffies(value);
 275 +               set_baseline_state(trigger_data); // resets timer
 276 +               write_unlock(&trigger_data->lock);
 277 +               ret = count;
 278 +       }
 279 +
 280 +       return ret;
 281 +}
 282 +
 283 +static DEVICE_ATTR(interval, 0644, led_interval_show, led_interval_store);
 284 +
 285 +static int netdev_trig_notify(struct notifier_block *nb,
 286 +                             unsigned long evt,
 287 +                             void *dv)
 288 +{
 289 +       struct net_device *dev = dv;
 290 +       struct led_netdev_data *trigger_data = container_of(nb, struct led_netdev_data, notifier);
 291 +
 292 +       if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER)
 293 +               return NOTIFY_DONE;
 294 +
 295 +       write_lock(&trigger_data->lock);
 296 +
 297 +       if (strcmp(dev->name, trigger_data->device_name))
 298 +               goto done;
 299 +
 300 +       if (evt == NETDEV_REGISTER) {
 301 +               if (trigger_data->net_dev != NULL)
 302 +                       dev_put(trigger_data->net_dev);
 303 +               dev_hold(dev);
 304 +               trigger_data->net_dev = dev;
 305 +               trigger_data->link_up = 0;
 306 +               goto done;
 307 +       }
 308 +
 309 +       if (evt == NETDEV_UNREGISTER && trigger_data->net_dev != NULL) {
 310 +               dev_put(trigger_data->net_dev);
 311 +               trigger_data->net_dev = NULL;
 312 +               goto done;
 313 +       }
 314 +
 315 +       /* UP / DOWN / CHANGE */
 316 +
 317 +       trigger_data->link_up = (evt != NETDEV_DOWN && netif_carrier_ok(dev));
 318 +       set_baseline_state(trigger_data);
 319 +
 320 +done:
 321 +       write_unlock(&trigger_data->lock);
 322 +       return NOTIFY_DONE;
 323 +}
 324 +
 325 +/* here's the real work! */
 326 +static void netdev_trig_timer(unsigned long arg)
 327 +{
 328 +       struct led_netdev_data *trigger_data = (struct led_netdev_data *)arg;
 329 +       struct rtnl_link_stats64 *dev_stats;
 330 +       unsigned new_activity;
 331 +        struct rtnl_link_stats64 temp;
 332 +
 333 +       write_lock(&trigger_data->lock);
 334 +
 335 +       if (!trigger_data->link_up || !trigger_data->net_dev || (trigger_data->mode & (MODE_TX | MODE_RX)) == 0) {
 336 +               /* we don't need to do timer work, just reflect link state. */
 337 +               led_set_brightness(trigger_data->led_cdev, ((trigger_data->mode & MODE_LINK) != 0 && trigger_data->link_up) ? LED_FULL : LED_OFF);
 338 +               goto no_restart;
 339 +       }
 340 +
 341 +       dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
 342 +       new_activity =
 343 +               ((trigger_data->mode & MODE_TX) ? dev_stats->tx_packets : 0) +
 344 +               ((trigger_data->mode & MODE_RX) ? dev_stats->rx_packets : 0);
 345 +
 346 +       if (trigger_data->mode & MODE_LINK) {
 347 +               /* base state is ON (link present) */
 348 +               /* if there's no link, we don't get this far and the LED is off */
 349 +
 350 +               /* OFF -> ON always */
 351 +               /* ON -> OFF on activity */
 352 +               if (trigger_data->led_cdev->brightness == LED_OFF) {
 353 +                       led_set_brightness(trigger_data->led_cdev, LED_FULL);
 354 +               } else if (trigger_data->last_activity != new_activity) {
 355 +                       led_set_brightness(trigger_data->led_cdev, LED_OFF);
 356 +               }
 357 +       } else {
 358 +               /* base state is OFF */
 359 +               /* ON -> OFF always */
 360 +               /* OFF -> ON on activity */
 361 +               if (trigger_data->led_cdev->brightness == LED_FULL) {
 362 +                       led_set_brightness(trigger_data->led_cdev, LED_OFF);
 363 +               } else if (trigger_data->last_activity != new_activity) {
 364 +                       led_set_brightness(trigger_data->led_cdev, LED_FULL);
 365 +               }
 366 +       }
 367 +
 368 +       trigger_data->last_activity = new_activity;
 369 +       mod_timer(&trigger_data->timer, jiffies + trigger_data->interval);
 370 +
 371 +no_restart:
 372 +       write_unlock(&trigger_data->lock);
 373 +}
 374 +
 375 +static void netdev_trig_activate(struct led_classdev *led_cdev)
 376 +{
 377 +       struct led_netdev_data *trigger_data;
 378 +       int rc;
 379 +
 380 +       trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
 381 +       if (!trigger_data)
 382 +               return;
 383 +
 384 +       rwlock_init(&trigger_data->lock);
 385 +
 386 +       trigger_data->notifier.notifier_call = netdev_trig_notify;
 387 +       trigger_data->notifier.priority = 10;
 388 +
 389 +       setup_timer(&trigger_data->timer, netdev_trig_timer, (unsigned long) trigger_data);
 390 +
 391 +       trigger_data->led_cdev = led_cdev;
 392 +       trigger_data->net_dev = NULL;
 393 +       trigger_data->device_name[0] = 0;
 394 +
 395 +       trigger_data->mode = 0;
 396 +       trigger_data->interval = msecs_to_jiffies(50);
 397 +       trigger_data->link_up = 0;
 398 +       trigger_data->last_activity = 0;
 399 +
 400 +       led_cdev->trigger_data = trigger_data;
 401 +
 402 +       rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
 403 +       if (rc)
 404 +               goto err_out;
 405 +       rc = device_create_file(led_cdev->dev, &dev_attr_mode);
 406 +       if (rc)
 407 +               goto err_out_device_name;
 408 +       rc = device_create_file(led_cdev->dev, &dev_attr_interval);
 409 +       if (rc)
 410 +               goto err_out_mode;
 411 +
 412 +       register_netdevice_notifier(&trigger_data->notifier);
 413 +       return;
 414 +
 415 +err_out_mode:
 416 +       device_remove_file(led_cdev->dev, &dev_attr_mode);
 417 +err_out_device_name:
 418 +       device_remove_file(led_cdev->dev, &dev_attr_device_name);
 419 +err_out:
 420 +       led_cdev->trigger_data = NULL;
 421 +       kfree(trigger_data);
 422 +}
 423 +
 424 +static void netdev_trig_deactivate(struct led_classdev *led_cdev)
 425 +{
 426 +       struct led_netdev_data *trigger_data = led_cdev->trigger_data;
 427 +
 428 +       if (trigger_data) {
 429 +               unregister_netdevice_notifier(&trigger_data->notifier);
 430 +
 431 +               device_remove_file(led_cdev->dev, &dev_attr_device_name);
 432 +               device_remove_file(led_cdev->dev, &dev_attr_mode);
 433 +               device_remove_file(led_cdev->dev, &dev_attr_interval);
 434 +
 435 +               write_lock(&trigger_data->lock);
 436 +
 437 +               if (trigger_data->net_dev) {
 438 +                       dev_put(trigger_data->net_dev);
 439 +                       trigger_data->net_dev = NULL;
 440 +               }
 441 +
 442 +               write_unlock(&trigger_data->lock);
 443 +
 444 +               del_timer_sync(&trigger_data->timer);
 445 +
 446 +               kfree(trigger_data);
 447 +       }
 448 +}
 449 +
 450 +static struct led_trigger netdev_led_trigger = {
 451 +       .name     = "netdev",
 452 +       .activate = netdev_trig_activate,
 453 +       .deactivate = netdev_trig_deactivate,
 454 +};
 455 +
 456 +static int __init netdev_trig_init(void)
 457 +{
 458 +       return led_trigger_register(&netdev_led_trigger);
 459 +}
 460 +
 461 +static void __exit netdev_trig_exit(void)
 462 +{
 463 +       led_trigger_unregister(&netdev_led_trigger);
 464 +}
 465 +
 466 +module_init(netdev_trig_init);
 467 +module_exit(netdev_trig_exit);
 468 +
 469 +MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
 470 +MODULE_DESCRIPTION("Netdev LED trigger");
 471 +MODULE_LICENSE("GPL");
 472 diff -Naur linux-3.2.33.org/drivers/leds/Makefile linux-3.2.33/drivers/leds/Makefile
 473 --- linux-3.2.33.org/drivers/leds/Makefile      2012-10-31 00:27:11.000000000 +0100
 474 +++ linux-3.2.33/drivers/leds/Makefile  2012-11-04 12:47:10.661589825 +0100
 475 @@ -54,3 +54,4 @@
 476  obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)   += ledtrig-backlight.o
 477  obj-$(CONFIG_LEDS_TRIGGER_GPIO)                += ledtrig-gpio.o
 478  obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)  += ledtrig-default-on.o
 479 +obj-$(CONFIG_LEDS_TRIGGER_NETDEV)      += ledtrig-netdev.o