[v2,2/2] net/hns3: refactor SVE code compile method
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Commit Message
Currently, the SVE code is compiled only when -march supports SVE
(e.g. '-march=armv8.2a+sve'), there maybe some problem[1] with this
approach.
The solution:
a. If the minimum instruction set support SVE then compiles it.
b. Else if the compiler support SVE then compiles it.
c. Otherwise don't compile it.
[1] https://mails.dpdk.org/archives/dev/2021-April/208189.html
Fixes: 8c25b02b082a ("net/hns3: fix enabling SVE Rx/Tx")
Fixes: 952ebacce4f2 ("net/hns3: support SVE Rx")
Cc: stable@dpdk.org
Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
drivers/net/hns3/hns3_rxtx.c | 2 +-
drivers/net/hns3/meson.build | 13 +++++++++++++
2 files changed, 14 insertions(+), 1 deletion(-)
@@ -2808,7 +2808,7 @@ hns3_get_default_vec_support(void)
static bool
hns3_get_sve_support(void)
{
-#if defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_SVE)
+#if defined(CC_SVE_SUPPORT)
if (rte_vect_get_max_simd_bitwidth() < RTE_VECT_SIMD_256)
return false;
if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SVE))
@@ -35,7 +35,20 @@ deps += ['hash']
if arch_subdir == 'arm' and dpdk_conf.get('RTE_ARCH_64')
sources += files('hns3_rxtx_vec.c')
+
+ # compile SVE when:
+ # a. support SVE in minimum instruction set baseline
+ # b. it's not minimum instruction set, but compiler support
if cc.get_define('__ARM_FEATURE_SVE', args: machine_args) != ''
+ cflags += ['-DCC_SVE_SUPPORT']
sources += files('hns3_rxtx_vec_sve.c')
+ elif cc.has_argument('-march=armv8.2-a+sve')
+ cflags += ['-DCC_SVE_SUPPORT']
+ hns3_sve_lib = static_library('hns3_sve_lib',
+ 'hns3_rxtx_vec_sve.c',
+ dependencies: [static_rte_ethdev],
+ include_directories: includes,
+ c_args: [cflags, '-march=armv8.2-a+sve'])
+ objs += hns3_sve_lib.extract_objects('hns3_rxtx_vec_sve.c')
endif
endif