Ignore power down event with disable_powersave=1 module option - #18
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When the chip is in lower power state, it listens only for the packets which destination MAC match device's MAC address. Incoming broadcast and multicast packets, which MAC does not equal to the device MAC, gets dropped. This breaks mDNS and other protocols. Power saving works as follows: the chip sends PWR_DOWN event to the kernel module when it's ready to go into lower state, and if the kernel is also ready (nothing in tx queue), it replies with ACK. Add disable_powersave=1 kernel option to ignore PWR_DOWN event completely to reliably accept multicast, at the cost of +0.4W Link: orangepi-xunlong/linux-orangepi#98 (comment)
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So apparently this is some kind of a router issue as well. |
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When the chip is in lower power state, it listens only for the packets which destination MAC match device's MAC address.
Incoming broadcast and multicast packets, which MAC does not equal to the device MAC, gets dropped.
This breaks mDNS and other protocols.
Power saving works as follows: the chip sends PWR_DOWN event to the kernel module when it's ready to go into lower state, and if the kernel is also ready (nothing in tx queue), it replies with ACK.
Add disable_powersave=1 kernel option to ignore PWR_DOWN event completely to reliably accept multicast, at the cost of +0.4W
Link: orangepi-xunlong/linux-orangepi#98 (comment)