Do we ever want to bind more than 8 multicast MAC addresses?

[Benjamin M. Schwartz]

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Ricardo Carrano wrote:
| Assuming this is correct, than some questions follow.
| - Is 4 a reasonable limit (is the XO capable of more in terms of processing
| and memory?)

The XO is definitely capable of more, especially for activities like Chat
that require minimal CPU/RAM and are usually silent on the network.

| - Is this a hard limit? How hard is to increase this number and what is the
| compromise?

I have an additional question:
Could the firmware allow the driver to designate one or more of those
slots as a trivial bitwise filter?  This would allow the driver to
subscribe to one or more ranges of multicast addresses.  It would also
provide graceful degradation if there are too many multicast addresses to
fit: the surplus addresses can just be OR'd together into a filter.  There
will be some false positives that will have to be screened out by the
driver, but perhaps not too many.

- --Ben
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