[dpdk-dev] [PATCH v5 0/2] net: add CRC run-time checks and AVX512/VPCLMULQDQ based CRC

[Mairtin o Loingsigh]

This patchset makes two significant enhancements to the CRC modules of
the rte_net library:

1) Adds run-time selection of the optimal architecture-specific CRC path.
   Previously the selection was solely made at compile-time, meaning it
   could only be built and run on the same generation of CPU. Adding
   run-time selection ability means this can be used from distro packages
   and/or DPDK can be compiled on an older CPU and run on a newer CPU.
2) Adds an optimized CRC implementation based on the AVX512 and
   VPCLMULQDQ instruction sets.
   
For further details, please see the commit messages of the individual
patches.

v5:
* Tidied-up the ifdef checks for RTE_ARCH_* and compiler support of CRC 
  paths, as per review comments:
  * All ifdef checks removed from API function definitions and moved into
    helper functions.
    
v4:
* Fixed build issue when older version of meson is used (0.47.1).
* Addressed review comments:
  * remove Intel copyright header from neon CRC file.
  * tidy-up of register initialisation.

v3:
* Re-submitted v2 as encountered problems when originally submitting it.

v2:
* Added support for run-time selection of optimal architecture-specific
  CRC, based on v1 review comment.
* Added full working AVX512/VPCLMULQDQ support for CRC32-Ethernet and
  CRC16-CCITT.

v1:
* Initial version, with incomplete AVX512/VPCLMULQDQ support for
  CRC32-Ethernet only.

Mairtin o Loingsigh (2):
  net: add run-time architecture specific CRC selection
  net: add support for AVX512/VPCLMULQDQ based CRC

 app/test/test_crc.c                               |  11 +-
 config/x86/meson.build                            |   6 +-
 doc/guides/rel_notes/release_20_11.rst            |   6 +
 lib/librte_net/meson.build                        |  89 ++++-
 lib/librte_net/net_crc.h                          |  45 +++
 lib/librte_net/net_crc_avx512.c                   | 423 ++++++++++++++++++++++
 lib/librte_net/{net_crc_neon.h => net_crc_neon.c} |  26 +-
 lib/librte_net/{net_crc_sse.h => net_crc_sse.c}   |  34 +-
 lib/librte_net/rte_net_crc.c                      | 162 +++++++--
 lib/librte_net/rte_net_crc.h                      |   4 +-
 10 files changed, 722 insertions(+), 84 deletions(-)
 create mode 100644 lib/librte_net/net_crc.h
 create mode 100644 lib/librte_net/net_crc_avx512.c
 rename lib/librte_net/{net_crc_neon.h => net_crc_neon.c} (95%)
 rename lib/librte_net/{net_crc_sse.h => net_crc_sse.c} (94%)

-- 
2.12.3