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[0/4] ethdev: add template table insertion and matching types

Message ID 20230121052158.2928238-1-akozyrev@nvidia.com (mailing list archive)
Headers

Message

Alexander Kozyrev Jan. 21, 2023, 5:21 a.m. UTC 
  Bring more flexibility and control over both flow rule insertion
and packet matching mechanisms. Introduce 2 new flow table types:

1. Allow a user to specify the insertion type used in template tables.
The insertion type is responsible for choosing the appropriate key
value used to map inserted flow rules into a template table.

Flow rules can be inserted by calculating the hash value for
the pattern or inserted by index via the new create_by_index() API.
The idea of the index-based insertion is to avoid additional matches
and simply execute predefined actions after jumping to the index.

The insertion to an already existing index is undefined and
depends on PMD implementation. An old rule must be destroyed first.
The index cannot be bigger than the size of the table.

2. Allow a user to specify the hash calculation function used in template
tables. The hash calculation type is responsible for the calculation of
the flow rule index a packet would hit upon arrival at the table.

Control over this is useful for applications with custom RSS algorithms,
for example. An application can select various packet fields to serve as
a hash calculation source and jump to the appropriate flow rule location.
The RSS hash result will be used as the index in the table. For the linear
hash function, the mapping is one-to-one and the hash result is the index.
For other hash functions, the index is the hash result module table size.
The RSS hash result can be retrieved via modify_field API: HASH_RESULT.

RFC: https://patchwork.dpdk.org/project/dpdk/patch/20221214022110.393410-1-akozyrev@nvidia.com/
PMD implementation will follow shortly.

Alexander Kozyrev (4):
  ethdev: add template table insertion type
  ethdev: add template table hash calculation function
  app/testpmd: add template table insertion type
  app/testpmd: add template table hash calculation function

 app/test-pmd/cmdline_flow.c            | 166 +++++++++++++++++++++++--
 app/test-pmd/config.c                  |  10 +-
 app/test-pmd/testpmd.h                 |   2 +-
 doc/guides/prog_guide/rte_flow.rst     |  20 +++
 doc/guides/rel_notes/release_23_03.rst |  11 ++
 lib/ethdev/rte_flow.c                  |  24 ++++
 lib/ethdev/rte_flow.h                  |  96 ++++++++++++++
 lib/ethdev/rte_flow_driver.h           |  11 ++
 lib/ethdev/version.map                 |   3 +
 9 files changed, 332 insertions(+), 11 deletions(-)