[PATCH v2 0/3] Add RISC-V V extension detection and LPM optimization

[uk7b@foxmail.com]

From: sunyuechi <sunyuechi@iscas.ac.cn>

This patch series adds support for the RISC-V Vector (V) extension and provides
an optimized implementation of `rte_lpm_lookupx4` using RVV. It includes runtime
detection of the V extension, conditional compilation based on compiler support
for RVV intrinsics.

Test results using lpm_perf_autotest on BPI-F3:
    scalar: 5.7 cycles
    rvv:    2.4 cycles

### v2:
- Improved commit messages.

sunyuechi (3):
  config/riscv: detect V extension
  lib/lpm: R-V V rte_lpm_lookupx4
  riscv: override machine_args only when default

 MAINTAINERS              |  2 +
 config/riscv/meson.build | 27 ++++++++++++
 lib/lpm/meson.build      |  1 +
 lib/lpm/rte_lpm.h        |  2 +
 lib/lpm/rte_lpm_rvv.h    | 91 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 123 insertions(+)
 create mode 100644 lib/lpm/rte_lpm_rvv.h

--
2.49.0