[RFC 0/4] RSS hash key generation

[Vladimir Medvedkin <vladimir.medvedkin@intel.com>]

Currently there are 2 methods to get the RSS hash key. The first method is to
randomly generate it. The second one is to use well known RSS hash keys. Both
methods have drawbacks. The first method not always provides a good hash
distribution. The second one does, but not for all ReTa sizes and not for all
traffic types. Additionaly, since these RSS hash keys are well known, they could
potentially be vulnerable to hash-collision DoS attacks.

The proposed API could be used to address both of these issues - the key can be
randomy generated and tailored to specific traffic profile distribution. For
example, if we know that we are receiving flows where source/destination
addresses are fixed or limited to a small quantity, but source port has good
distribution, we could generate an RSS key that will give us good distribution
across our ReTa.

Vladimir Medvedkin (4):
  thash: add RSS hash key generation API
  hash: add dynamic polynomial calculation
  hash: implement RSS hash key generation API
  test/thash: add tests for RSS key generation API

 app/test/test_thash.c              | 108 ++++++++++++
 lib/hash/meson.build               |   1 +
 lib/hash/rte_thash.c               |  72 ++++----
 lib/hash/rte_thash.h               |  37 +++++
 lib/hash/rte_thash_gf2_poly_math.c | 253 +++++++++++++++++++++++++++++
 lib/hash/version.map               |   5 +-
 6 files changed, 435 insertions(+), 41 deletions(-)
 create mode 100644 lib/hash/rte_thash_gf2_poly_math.c

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2.34.1