FreeBSD source tree https://cgit-dev.freebsd.org/src/atom?h=stable%2F13 2023-08-23T17:43:27Z 2023-08-23T17:43:27Z Warner Losh imp@FreeBSD.org 2023-08-22T01:31:56Z urn:sha1:5510f79042fbd543de55807d0da7f8a2b8be2f89 Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/ Similar commit in current: (cherry picked from commit 031beb4e239b) 2021-01-09T12:41:04Z Alexander V. Chernikov melifaro@FreeBSD.org 2021-01-09T12:08:00Z urn:sha1:537d134373141c2d25bfb24af6d661d0e6102927 This change introduces loadable fib lookup modules based on DPDK rte_lpm lib targeted for high-speed lookups in large-scale tables. It is based on the lookup framework described in D27401. IPv4 module is called dpdk_lpm4. It wraps around rte_lpm [1] library. This library implements variation of DIR24-8 [2] lookup algorithm. Module provide lockless route lookups and in-place incremental updates, allowing for good RIB performance. IPv6 module is called dpdk_lpm6. It wraps around rte_lpm6 [3] library. Implementation can be seen as multi-bit trie where the stride or number of bits inspected on each level varies from level to level. It can vary from 1 to 14 memory accesses, with 5 being the average value for the lengths that are most commonly used in IPv6. Module provide lockless route lookups for global unicast addresses and in-place incremental updates, allowing for good RIB performance. Implementation details: * wrapper code lives in `sys/contrib/dpdk_rte_lpm/dpdk_lpm[6].c`. * rte_lpm[6] implementation contains both RIB and FIB code. . RIB ("rule_") code, backed by array of hash tables part has been commented out, as base radix already provides all the necessary primitives. * link-local lookups are currently implemented as base radix lookup. This part should be converted to something like read-only radix trie. Usage detail: Compile kernel with option FIB_ALGO and load dpdk_lpm4/dpdk_lpm6 module at any time. They will be picked up automatically when amount of routes raises to several thousand. [1]: https://doc.dpdk.org/guides/prog_guide/lpm_lib.html [2]: http://yuba.stanford.edu/~nickm/papers/Infocom98_lookup.pdf [3]: https://doc.dpdk.org/guides/prog_guide/lpm6_lib.html Differential Revision: https://reviews.freebsd.org/D27412