[FS#580] Netgear R7800 does not receive multicast messages on LAN interfaces

[LEDE Bugs]

The following task has a new comment added:

FS#580 - Netgear R7800 does not receive multicast messages on LAN interfaces
User who did this - Graham Cobb (gcobb)

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I have tried a few hacks to dwmac1000_set_filter to try to track down the problem.

  * I tried ignoring the value of dwmac1000_set_filter (6) and tried 7 and 8 instead. Neither fixed the problem so I assume that 6 is the correct value.

  * I tried setting all 64-bits in the multicast filter hash. This should match all multicast addresses but it also didn't fix the problem so I presume it is actually a bug in the multicast jash filter (hardware or firmware).

It looks like the only fix for the apparently broken multicast filter hardware is to treat the device as though it didn't have a filter and just set GMAC_FRAME_FILTER_PM (pass all multi) whenever any multicast address is set.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=580#comment2041