Option `FIB_ALGO` gates new modular fib lookup functionality, enabling more performant routing table lookups.
The initial support was added in D27401, back in [December](https://github.com/freebsd/freebsd-src/commit/f5baf8bb12f39d0e8d64508c47eb6c4386ef716d).
A number of issues have been fixed since then: [1](https://github.com/freebsd/freebsd-src/commit/81728a538d24f483d0986850fa3f51d5d84d8f26#diff-40c41065d24d41789bc00670f1e8a973ee699f3e12ab1ab11543279a6755190a), [2](https://github.com/freebsd/freebsd-src/commit/685de460bc91737331eaf475b0f517517b2ddbd0#diff-aaa25119277c304578fc27a9d35fe55ac777617cd5a21d1f1c6440059b5b66bc), [3](https://github.com/freebsd/freebsd-src/commit/151ec796a23098279531eaebbf30d08a0877ee4e#diff-aaa25119277c304578fc27a9d35fe55ac777617cd5a21d1f1c6440059b5b66bc).
At this point, I believe it should be ready for the wider audience, e.g. all -CURRENT users.