what to replace splnet in FreeBSD 5.x?

[Robert Watson]

On Sat, 23 Jul 2005, Robert Watson wrote:

> The attached patch introduces locking around the link layer and IPv4 
> multicast address lists, as well as updates drivers to use the locking. 
> It's a fairly large diff, but other than the changes to if.c, in.c, and 
> igmp.c, is fairly mechanical.  It may well correct the problem you've 
> been seeing.  If possible, and given sufficient review, I'd like to get 
> this change into 6.0, especially given that it affects the layout of 
> struct ifnet which is part of the ABI for network interface device 
> drivers.

Updated version of the patch at:

     http://www.watson.org/~robert/freebsd/netperf/20050523-multicast.diff

Spl-related cleanups (no longer useful documentation of old 
synchronization in many places), lock order hard-coded into WITNESS order 
rather than dynamically detected.

Robert N M Watson