It's quite useful to be able to trigger LEDs based on network activity, similar mechanisms exist in routers and gateway devices. I am looking to mainline a patch that has existed out of tree for some time in OpenWRT/LEDE. The patch has been updated and restructured and most of the issues raised in the initial submission have been addressed [1].
I am also including the netdev mailing list as it was suggested previously that if there is no activity the interval will still run and is wasteful [1] https://lkml.org/lkml/2010/11/14/116 Ben Whitten (1): leds: trigger: Introduce a NETDEV trigger .../ABI/testing/sysfs-class-led-trigger-netdev | 45 +++ drivers/leds/trigger/Kconfig | 7 + drivers/leds/trigger/Makefile | 1 + drivers/leds/trigger/ledtrig-netdev.c | 428 +++++++++++++++++++++ 4 files changed, 481 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-netdev create mode 100644 drivers/leds/trigger/ledtrig-netdev.c -- 2.7.4
