Enable ROUTE_MPATH support in GENERIC kernels.
Ability to load-balance traffic over multiple path is a must-have thing for routers.
It may be used by the servers to balance outgoing traffic over multiple default gateways.
The previous implementation, RADIX_MPATH stayed in the shadow for too long. It was not well maintained, which lead us to a vicious circle - people were using non-contiguous mask or firewalls to achieve similar goals. As a result, some routing daemons implementation still don't have multipath support enabled for FreeBSD.
Turning on ROUTE_MPATH by default would fix it. It will allow to reduce networking feature gap to other operating systems. Linux and OpenBSD has the support for at least 5 years.
ROUTE_MPATH does not consume memory unless actually used. It enables around ~1k LOC.
It does not bring any behaviour changes for userland.
Additionally, feature is (temporarily) turned off by the net.route.multipath sysctl defaulting to 0.
- Enable ROUTE_MPATH code compile by default (this review, targetting first week of December)
- Turn on net.route.multipath sysctl to 1 by default. (followup review, targetting middle of December)