Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific
bits.
The motivation here is to eventually teach netisr and potentially
other networking subsystems a bit more about how RSS work queues / buckets
are configured so things have a hope of auto-configuring in the future.
- net/rss_config.[ch] takes care of the generic bits for doing configuration, hash function selection, etc;
- topelitz.[ch] is now in net/ rather than netinet/;
- (and would be in libkern if it didn't directly include RSS_KEYSIZE; that's a later thing to fix up.)
- netinet/in_rss.[ch] now just contains the IPv4 specific methods;
- and netinet/in6_rss.[ch] now just contains the IPv6 specific methods.
This should have no functional impact on anyone currently using
the RSS support.
Differential Revision: D1383
Reviewed by: gnn, jfv (intel driver bits)