[dpdk-dev] [PATCH v3 0/4] add new k32v64 hash table

[Mattias Rönnblom]

On 2020-04-15 20:17, Vladimir Medvedkin wrote:
> Currently DPDK has a special implementation of a hash table for
> 4 byte keys which is called FBK hash. Unfortunately its main drawback
> is that it only supports 2 byte values.
> The new implementation called K32V64 hash
> supports 4 byte keys and 8 byte associated values,
> which is enough to store a pointer.
>
> It would also be nice to get feedback on whether to leave the old FBK
> and new k32v64 implementations or deprecate the old one?


Do you think it would be feasible to support custom-sized values and 
remain efficient, in a similar manner to how rte_ring_elem.h does things?


> v3:
> - added bulk lookup
> - avx512 key comparizon is removed from .h
>
> v2:
> - renamed from rte_dwk to rte_k32v64 as was suggested
> - reworked lookup function, added inlined subroutines
> - added avx512 key comparizon routine
> - added documentation
> - added statistic counters for total entries and extended entries(linked list)
>
> Vladimir Medvedkin (4):
>    hash: add k32v64 hash library
>    hash: add documentation for k32v64 hash library
>    test: add k32v64 hash autotests
>    test: add k32v64 perf tests
>
>   app/test/Makefile                         |   1 +
>   app/test/autotest_data.py                 |  12 ++
>   app/test/meson.build                      |   3 +
>   app/test/test_hash_perf.c                 | 130 ++++++++++++
>   app/test/test_k32v64_hash.c               | 229 ++++++++++++++++++++++
>   doc/api/doxy-api-index.md                 |   1 +
>   doc/guides/prog_guide/index.rst           |   1 +
>   doc/guides/prog_guide/k32v64_hash_lib.rst |  66 +++++++
>   lib/Makefile                              |   2 +-
>   lib/librte_hash/Makefile                  |  13 +-
>   lib/librte_hash/k32v64_hash_avx512vl.c    |  56 ++++++
>   lib/librte_hash/meson.build               |  17 +-
>   lib/librte_hash/rte_hash_version.map      |   6 +-
>   lib/librte_hash/rte_k32v64_hash.c         | 315 ++++++++++++++++++++++++++++++
>   lib/librte_hash/rte_k32v64_hash.h         | 211 ++++++++++++++++++++
>   15 files changed, 1058 insertions(+), 5 deletions(-)
>   create mode 100644 app/test/test_k32v64_hash.c
>   create mode 100644 doc/guides/prog_guide/k32v64_hash_lib.rst
>   create mode 100644 lib/librte_hash/k32v64_hash_avx512vl.c
>   create mode 100644 lib/librte_hash/rte_k32v64_hash.c
>   create mode 100644 lib/librte_hash/rte_k32v64_hash.h
>