[PATCH v7 0/6] flow_parser: add shared parser library

[Lukas Sismis]

This series extracts the testpmd flow CLI parser into a reusable library,
enabling external applications to parse rte_flow rules using testpmd syntax.

Motivation
----------
External applications like Suricata IDS [1] need to express hardware filtering
rules in a consistent, human-readable format. Rather than inventing custom
syntax, reusing testpmd's well-tested flow grammar provides immediate
compatibility with existing documentation and user knowledge.

Note: This library provides only one way to create rte_flow structures.
Applications can also construct rte_flow_attr, rte_flow_item[], and
rte_flow_action[] directly in C code.

Design
------
The library (librte_flow_parser) exposes the following APIs:
- rte_flow_parser_parse_attr_str(): Parse attributes only
- rte_flow_parser_parse_pattern_str(): Parse patterns only
- rte_flow_parser_parse_actions_str(): Parse actions only

Testpmd is updated to use the library, ensuring a single
maintained parser implementation.

Testing and Demo
-------
- Functional tests in dpdk-test
- Example application: examples/flow_parsing

Changes
-------
v7:
- Fixed implicit integer comparison (while (left) -> while (left != 0))
- NULL checks fixed
- arpa header removed for Windows compatibility
- minor comments from the last review addressed

v6:
- Inconsistent Experimental API Version adjusted
- Fixes Tag added to MSVC build commit
- Non-Standard Header Guards updated
- Implicit Pointer Comparison and Return Type issues addressed in many places
- commit message in patch 6 updated

v5:
- removed/replaced (f)printf code from the library 
- reverted back to exporting the internal/private API as it is needed by
  testpmd and cannot be easily split further.
- adjusted length of certain lines
- marking port/queue id typedef as experimental
- updated release rel_notes
- copyeright adjustments

v4:
- ethdev changes in separate commit
- library's public API only exposes attribute, pattern and action parsing,
  while the full command parsing is kept internal for testpmd usage only.
- Addressed Stephen's comments from V3
- dpdk-test now have tests focused on public and internal library functions

v3:
- Add more functional tests
- More concise MAINTAINERS updates
- Updated license headers
- A thing to note: When playing with flow commands, I figured, some may use
  non-flow commands, such as raw decap/encap, policy meter and others.
  Flow parser library itself now supports `set` command to set e.g. the decap/
  encap parameters, as the flow syntax only supports defining the index of the
  encap/decap configs. The library, however, does not support e.g. `create`
  command to create policy meters, as that is just an ID and it can be created
  separately using rte_meter APIs.

[1] https://github.com/OISF/suricata/pull/13950

Lukas Sismis (6):
  cmdline: include stddef.h for MSVC compatibility
  ethdev: add RSS type helper APIs
  flow_parser: add shared parser library
  app/testpmd: use shared flow parser library
  examples/flow_parsing: add flow parser demo
  test: add flow parser library functional tests

 MAINTAINERS                                   |     6 +-
 app/test-pmd/cmd_flex_item.c                  |    41 +-
 app/test-pmd/cmdline.c                        |   267 +-
 app/test-pmd/config.c                         |   112 +-
 app/test-pmd/flow_parser.c                    |   409 +
 app/test-pmd/flow_parser_cli.c                |   153 +
 app/test-pmd/meson.build                      |     5 +-
 app/test-pmd/testpmd.c                        |     4 +
 app/test-pmd/testpmd.h                        |   126 +-
 app/test/meson.build                          |     1 +
 app/test/test_ethdev_api.c                    |    51 +
 app/test/test_flow_parser.c                   |   923 ++
 doc/api/doxy-api-index.md                     |     1 +
 doc/api/doxy-api.conf.in                      |     1 +
 doc/guides/prog_guide/flow_parser_lib.rst     |   111 +
 doc/guides/prog_guide/index.rst               |     1 +
 doc/guides/rel_notes/release_26_03.rst        |    21 +
 examples/flow_parsing/main.c                  |   292 +
 examples/flow_parsing/meson.build             |    11 +
 examples/meson.build                          |     1 +
 lib/cmdline/cmdline_parse.h                   |     2 +
 lib/ethdev/rte_ethdev.c                       |   107 +
 lib/ethdev/rte_ethdev.h                       |    77 +
 lib/flow_parser/meson.build                   |     7 +
 .../flow_parser/rte_flow_parser.c             | 11437 ++++++++--------
 lib/flow_parser/rte_flow_parser.h             |   134 +
 lib/flow_parser/rte_flow_parser_private.h     |  1247 ++
 lib/meson.build                               |     2 +
 28 files changed, 9715 insertions(+), 5835 deletions(-)
 create mode 100644 app/test-pmd/flow_parser.c
 create mode 100644 app/test-pmd/flow_parser_cli.c
 create mode 100644 app/test/test_flow_parser.c
 create mode 100644 doc/guides/prog_guide/flow_parser_lib.rst
 create mode 100644 examples/flow_parsing/main.c
 create mode 100644 examples/flow_parsing/meson.build
 create mode 100644 lib/flow_parser/meson.build
 rename app/test-pmd/cmdline_flow.c => lib/flow_parser/rte_flow_parser.c (55%)
 create mode 100644 lib/flow_parser/rte_flow_parser.h
 create mode 100644 lib/flow_parser/rte_flow_parser_private.h

-- 
2.43.7