Rx interrupts, functions to post a request for new table entries, and
code to apply pending Rx-interrupt control values at the next hardware
interrupt.
As used in a third-party proprietary tree since at least March 2003.
As discussed on tech-kern/tech-net in January 2004 (in the context of
NetBSD for packet capture, bpf, and FreeBSD-sylte IFF_POLL), and as
posted to tech-net for comments in mid-March 2004.
Still missing sysctl or other knobs to acutally change the config-time
values, due to my ignorance of any accepted per-device sysctl namespace.
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