[v4,0/4] add new kv hash table

  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 KV hash
supports 4 byte keys and 8 byte associated values,
which is enough to store a pointer.

v4:
- internal implementation is hided under universal API for any key and value sizes
- add and delete API now return old value
- add transaction counter modification to _add()
- transaction counter now modifies with c11 atomics

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 kv hash library
  hash: add documentation for kv hash library
  test: add kv hash autotests
  test: add kv perf tests

 app/test/Makefile                      |   1 +
 app/test/autotest_data.py              |  12 ++
 app/test/meson.build                   |   3 +
 app/test/test_hash_perf.c              | 111 +++++++++++++
 app/test/test_kv_hash.c                | 242 ++++++++++++++++++++++++++++
 doc/api/doxy-api-index.md              |   1 +
 doc/guides/prog_guide/index.rst        |   1 +
 doc/guides/prog_guide/kv_hash_lib.rst  |  66 ++++++++
 lib/Makefile                           |   2 +-
 lib/librte_hash/Makefile               |  14 +-
 lib/librte_hash/k32v64_hash.c          | 277 +++++++++++++++++++++++++++++++++
 lib/librte_hash/k32v64_hash.h          |  98 ++++++++++++
 lib/librte_hash/k32v64_hash_avx512vl.c |  59 +++++++
 lib/librte_hash/meson.build            |  17 +-
 lib/librte_hash/rte_hash_version.map   |   6 +-
 lib/librte_hash/rte_kv_hash.c          | 184 ++++++++++++++++++++++
 lib/librte_hash/rte_kv_hash.h          | 169 ++++++++++++++++++++
 17 files changed, 1258 insertions(+), 5 deletions(-)
 create mode 100644 app/test/test_kv_hash.c
 create mode 100644 doc/guides/prog_guide/kv_hash_lib.rst
 create mode 100644 lib/librte_hash/k32v64_hash.c
 create mode 100644 lib/librte_hash/k32v64_hash.h
 create mode 100644 lib/librte_hash/k32v64_hash_avx512vl.c
 create mode 100644 lib/librte_hash/rte_kv_hash.c
 create mode 100644 lib/librte_hash/rte_kv_hash.h