537d134373
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 |
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.github/workflows | ||
bin | ||
cddl | ||
contrib | ||
crypto | ||
etc | ||
gnu | ||
include | ||
kerberos5 | ||
lib | ||
libexec | ||
release | ||
rescue | ||
sbin | ||
secure | ||
share | ||
stand | ||
sys | ||
targets | ||
tests | ||
tools | ||
usr.bin | ||
usr.sbin | ||
.arcconfig | ||
.arclint | ||
.cirrus.yml | ||
.clang-format | ||
.gitattributes | ||
.gitignore | ||
COPYRIGHT | ||
LOCKS | ||
MAINTAINERS | ||
Makefile | ||
Makefile.inc1 | ||
Makefile.libcompat | ||
Makefile.sys.inc | ||
ObsoleteFiles.inc | ||
README | ||
README.md | ||
RELNOTES | ||
UPDATING |
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