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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
32 lines
998 B
C
32 lines
998 B
C
#ifndef _RTE_SHIM_H_
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#define _RTE_SHIM_H_
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#define rte_malloc(_type, _size, _align) malloc(_size, M_TEMP, M_NOWAIT)
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#define rte_free(_ptr) free(_ptr, M_TEMP)
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#define rte_zmalloc(_type, _size, _align) malloc(_size, M_TEMP, M_NOWAIT | M_ZERO)
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#define rte_zmalloc_socket(_type, _size, _align, _s) malloc(_size, M_TEMP, M_NOWAIT | M_ZERO)
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#define rte_mcfg_tailq_write_unlock()
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#define rte_mcfg_tailq_write_lock()
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#define RTE_CACHE_LINE_SIZE CACHE_LINE_SIZE
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#define strtoull strtoul
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#define assert(_s) KASSERT((_s), ("DPDK: assert failed"))
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#define rte_memcpy memcpy
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#define rte_strerror(_err) "strerror_not_implemented"
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#define RTE_LOG(_sev, _sub, _fmt, ...) printf("DPDK::" #_sev "::" #_sub " %s: " _fmt, __func__ , ## __VA_ARGS__)
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#include "sys/endian.h"
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#define RTE_BYTE_ORDER BYTE_ORDER
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#define RTE_LITTLE_ENDIAN LITTLE_ENDIAN
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#define RTE_BIG_ENDIAN BIG_ENDIAN
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#include "sys/limits.h" // CHAR_BIT
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#define rte_le_to_cpu_32 le32toh
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#include "rte_jhash.h"
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#include "rte_common.h"
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#endif
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