Merge 'build: use DPDK_MACHINE=haswell when testing dpdk build on git…

…hub-hosted runner' from Kefu Chai

when building dpdk on a building host which has AVX10.1 ISA support,
with Clang 18, we have following failure
```
/usr/lib/llvm-18/bin/clang -Ilib/net/libnet_crc_avx512_lib.a.p -Ilib/net -I../../../../../../dpdk/lib/net -I. -I../../../../../../dpdk -Iconfig -I../../../../../../dpdk/config -Ilib/eal/include -I../../../../../../dpdk/lib/eal/include -Ilib/eal/linux/include -I../../../../../../dpdk/lib/eal/linux/include -Ilib/eal/x86/include -I../../../../../../dpdk/lib/eal/x86/include -Ilib/eal/common -I../../../../../../dpdk/lib/eal/common -Ilib/eal -I../../../../../../dpdk/lib/eal -Ilib/kvargs -I../../../../../../dpdk/lib/kvargs -Ilib/metrics -I../../../../../../dpdk/lib/metrics -Ilib/telemetry -I../../../../../../dpdk/lib/telemetry -fcolor-diagnostics -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -O3 -include rte_config.h -Wcast-qual -Wdeprecated -Wformat -Wformat-nonliteral -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpointer-arith -Wsign-compare -Wstrict-prototypes -Wundef -Wwrite-strings -Wno-address-of-packed-member -Wno-missing-field-initializers -D_GNU_SOURCE -Wno-error -fPIC -march=native -DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation -DCC_X86_64_SSE42_PCLMULQDQ_SUPPORT -DCC_X86_64_AVX512_VPCLMULQDQ_SUPPORT -mavx512f -mavx512bw -mavx512dq -mavx512vl -mvpclmulqdq -mavx2 -mavx -MD -MQ lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o -MF lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o.d -o lib/net/libnet_crc_avx512_lib.a.p/net_crc_avx512.c.o -c ../../../../../../dpdk/lib/net/net_crc_avx512.c
Error: ../../../../../../dpdk/lib/net/net_crc_avx512.c:324:22: error: always_inline function '_mm512_broadcast_i32x4' requires target feature 'evex512', but would be inlined into function 'crc32_load_init_constants' that is compiled without support for 'evex512'
  324 |         crc32_eth.rk1_rk2 = _mm512_broadcast_i32x4(a);
      |                             ^
```

according to https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
and
https://github.com/llvm/llvm-project/blob/release/18.x/clang/docs/UsersManual.rst#x86,
we should either use `-mevex512` or use `-mavx10.1-512` for accessing these new vectorized instructions provided by AVX10.1.

we also pass `-march=native` to the compiler. and it turns out that at least some github-hosted runners do not support AVX10.1 ISA, but the Clang 18 compiler does. so this combination breaks the build, as dpdk tries to check if compiler supports AVX512, and if it does, dpdk builds the AVX512 C files with this unsupported combination. that's why we
have build failures recently.

to address this issue, instead of using "native" as the value of `Seastar_DPDK_MACHINE`, let's use a more conservative but still capable architecture supported by github-hosted runner: "haswell", which supports the instruction set that is used by quite a few DPDK optimizations. so we can still have a decent coverage for building with DPDK, and for testing the build. please note, we don't test Seastar with the DPDK backend yet.

to enable the workflow to pass extra options to `configure.py`, we change the "cooks" parameter in the matrix to "options", and append "--dpdk-machine haswell" to it, so that we use this option only when testing the dpdk build.

Fixes #2242

Closes #2243

* github.com:scylladb/seastar:
  build: use DPDK_MACHINE=haswell when testing dpdk build on github-hosted runner
  build: add --dpdk-machine option to configure.py
  build: stop translating -march option to names recognized by DPDK

.github/workflows/tests.yaml

@@ -60,7 +60,7 @@ jobs:
           - compiler: clang++-18
             standard: 23
             mode: release
-            cooks: --cook dpdk
+            options: --cook dpdk --dpdk-machine haswell
             enables: --enable-dpdk
           - compiler: clang++-18
             standard: 23
@@ -69,7 +69,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          submodules: "${{ contains(matrix.cooks, 'dpdk') }}"
+          submodules: "${{ contains(matrix.enables, 'dpdk') }}"
 
       - name: Install build dependencies
         run: |
@@ -98,7 +98,7 @@ jobs:
           --compiler $CXX
           --c-compiler $CC
           --mode ${{ matrix.mode }}
-          ${{ matrix.cooks }}
+          ${{ matrix.options }}
           ${{ matrix.enables }} ;
 
       - name: Build

configure.py

@@ -139,6 +139,7 @@ def standard_supported(standard, compiler='g++'):
 arg_parser.add_argument('--compile-commands-json', dest='cc_json', action='store_true',
                         help='Generate a compile_commands.json file for integration with clangd and other tools.')
 arg_parser.add_argument('--heap-profiling', dest='heap_profiling', action='store_true', default=False, help='Enable heap profiling')
+arg_parser.add_argument('--dpdk-machine', default='native', help='Specify the target architecture')
 add_tristate(arg_parser, name='deferred-action-require-noexcept', dest='deferred_action_require_noexcept', help='noexcept requirement for deferred actions', default=True)
 arg_parser.add_argument('--prefix', dest='install_prefix', default='/usr/local', help='Root installation path of Seastar files')
 args = arg_parser.parse_args()
@@ -163,32 +164,6 @@ def identify_best_standard(cpp_standards, compiler):
     args.cpp_standard = identify_best_standard(cpp_standards, compiler=args.cxx)
 
 
-def infer_dpdk_machine(user_cflags):
-    """Infer the DPDK machine identifier (e.g., 'ivb') from the space-separated
-    string of user cflags by scraping the value of `-march` if it is present.
-
-    The default if no architecture is indicated is 'native'.
-    """
-    arch = 'native'
-
-    # `-march` may be repeated, and we want the last one.
-    # strip features, leave only the arch: armv8-a+crc+crypto -> armv8-a
-    for flag in user_cflags.split():
-        if flag.startswith('-march'):
-            arch = flag[7:].split('+')[0]
-
-    MAPPING = {
-        'native': 'native',
-        'nehalem': 'nhm',
-        'westmere': 'wsm',
-        'sandybridge': 'snb',
-        'ivybridge': 'ivb',
-        'armv8-a': 'armv8a',
-    }
-
-    return MAPPING.get(arch, 'native')
-
-
 MODES = seastar_cmake.SUPPORTED_MODES if args.mode == 'all' else [args.mode]
 
 # For convenience.
@@ -223,7 +198,7 @@ def configure_mode(mode):
         tr(LDFLAGS, 'LD_FLAGS'),
         tr(args.cxx_modules, 'MODULE'),
         tr(args.dpdk, 'DPDK'),
-        tr(infer_dpdk_machine(args.user_cflags), 'DPDK_MACHINE'),
+        tr(args.dpdk_machine, 'DPDK_MACHINE'),
         tr(args.hwloc, 'HWLOC', value_when_none='yes'),
         tr(args.io_uring, 'IO_URING', value_when_none=None),
         tr(args.alloc_failure_injection, 'ALLOC_FAILURE_INJECTION', value_when_none='DEFAULT'),