Hi, Ferruh
Could you review this patch ? Thanks
From:Ruifeng Wang <ruifeng.w...@arm.com>
To:Fengchengwen <fengcheng...@huawei.com>;Thomas Monjalon
<tho...@monjalon.net>;ferruh.yigit <ferruh.yi...@intel.com>
Cc:dev <dev@dpdk.org>;Jerin Jacob <jer...@marvell.com>;viktorin
<vikto...@rehivetech.com>;Richardson, Bruce
<bruce.richard...@intel.com>;Honnappa Nagarahalli
<honnappa.nagaraha...@arm.com>;jerinjacobk <jerinjac...@gmail.com>;Juraj Linkeš
<juraj.lin...@pantheon.tech>;nd <n...@arm.com>;nd <n...@arm.com>
Date:2021-05-25 14:04:52
Subject:RE: [PATCH v8 2/2] net/hns3: refactor SVE code compile method
> -----Original Message-----
> From: Chengwen Feng < fengcheng...@huawei.com<mailto:fengcheng...@huawei.com>>
> Sent: Monday, May 24, 2021 9:23 PM
> To: tho...@monjalon.net<mailto:tho...@monjalon.net>;
> ferruh.yi...@intel.com<mailto:ferruh.yi...@intel.com>
> Cc: dev@dpdk.org<mailto:dev@dpdk.org>;
> jer...@marvell.com<mailto:jer...@marvell.com>; Ruifeng Wang
> < ruifeng.w...@arm.com<mailto:ruifeng.w...@arm.com>>;
> vikto...@rehivetech.com<mailto:vikto...@rehivetech.com>;
> bruce.richard...@intel.com<mailto:bruce.richard...@intel.com>; Honnappa
> Nagarahalli
> < honnappa.nagaraha...@arm.com<mailto:honnappa.nagaraha...@arm.com>>;
> jerinjac...@gmail.com<mailto:jerinjac...@gmail.com>;
> juraj.lin...@pantheon.tech<mailto:juraj.lin...@pantheon.tech>; nd <
> n...@arm.com<mailto:n...@arm.com>>
> Subject: [PATCH v8 2/2] net/hns3: refactor SVE code compile method
>
> 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.
>
> Note: this patch also fixes compile error with gcc8.3 + '-march=armv8.a+sve',
> the error is arm_sve.h no such file or directory.
>
> [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: sta...@dpdk.org<mailto:sta...@dpdk.org>
>
> Signed-off-by: Chengwen Feng <
> fengcheng...@huawei.com<mailto:fengcheng...@huawei.com>>
> ---
> drivers/net/hns3/hns3_rxtx.c | 2 +-
> drivers/net/hns3/meson.build | 20 +++++++++++++++++++-
> 2 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
> index 1d7a769..9b2f082 100644
> --- a/drivers/net/hns3/hns3_rxtx.c
> +++ b/drivers/net/hns3/hns3_rxtx.c
> @@ -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_ACLE_SUPPORT)
> if (rte_vect_get_max_simd_bitwidth() < RTE_VECT_SIMD_256)
> return false;
> if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SVE))
> diff --git a/drivers/net/hns3/meson.build b/drivers/net/hns3/meson.build
> index 53c7df7..aabcf23 100644
> --- a/drivers/net/hns3/meson.build
> +++ b/drivers/net/hns3/meson.build
> @@ -35,7 +35,25 @@ deps += ['hash']
>
> if arch_subdir == 'arm' and dpdk_conf.get('RTE_ARCH_64')
> sources += files('hns3_rxtx_vec.c')
> - if cc.get_define('__ARM_FEATURE_SVE', args: machine_args) != ''
> +
> + # compile SVE when:
> + # a. support SVE in minimum instruction set baseline
> + # b. it's not minimum instruction set, but compiler support
> + if dpdk_conf.has('CC_SVE_ACLE_SUPPORT')
> sources += files('hns3_rxtx_vec_sve.c')
> + elif cc.has_argument('-march=armv8.2-a+sve') and
> cc.check_header('arm_sve.h')
> + cflags += ['-DCC_SVE_ACLE_SUPPORT=1']
> + sve_cflags = []
> + foreach flag: cflags
> + if not (flag.startswith('-march=') or flag.startswith('-mcpu=')
> or
> flag.startswith('-mtune='))
> + sve_cflags += flag
> + endif
> + endforeach
> + hns3_sve_lib = static_library('hns3_sve_lib',
> + 'hns3_rxtx_vec_sve.c',
> + dependencies: [static_rte_ethdev],
> + include_directories: includes,
> + c_args: [sve_cflags, '-march=armv8.2-a+sve'])
> + objs += hns3_sve_lib.extract_objects('hns3_rxtx_vec_sve.c')
> endif
> endif
> --
> 2.8.1
Reviewed-by: Ruifeng Wang < ruifeng.w...@arm.com<mailto:ruifeng.w...@arm.com>>
