Re: [dpdk-dev] [PATCH v5 2/2] net/hns3: refactor SVE code compile method

From: David Marchand <david.marchand@redhat.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>,
	 Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	Chengwen Feng <fengchengwen@huawei.com>
Cc: "thomas@monjalon.net" <thomas@monjalon.net>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>,
	"viktorin@rehivetech.com" <viktorin@rehivetech.com>,
	 "bruce.richardson@intel.com" <bruce.richardson@intel.com>,
	 "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>,
	 "juraj.linkes@pantheon.tech" <juraj.linkes@pantheon.tech>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v5 2/2] net/hns3: refactor SVE code compile method
Date: Wed, 19 May 2021 10:08:21 +0200	[thread overview]
Message-ID: <CAJFAV8w+5uyP17CL=_-yq5jA4PDwxRmXp_-Di1GQT643iaBkrw@mail.gmail.com> (raw)
In-Reply-To: <394de3ea-f0ba-a5a3-e751-be04f479281d@intel.com>

On Tue, May 18, 2021 at 6:28 PM Ferruh Yigit <ferruh.yigit@intel.com> wrote:
>
> On 5/14/2021 3:12 PM, Honnappa Nagarahalli wrote:
> > <snip>
> >
> >>
> >> 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>
> > Looks good to me.
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> >
>
> Applied to dpdk-next-net/main, thanks.
>
> (Only this patch, 2/2, applied, not whole set)

UNH caught a build regression on next-net and I think this is due to this patch:
https://lab.dpdk.org/results/dashboard/tarballs/15259/

FAILED: drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o
ccache cc -Idrivers/net/hns3/libhns3_sve_lib.a.p -Idrivers/net/hns3
-I../drivers/net/hns3 -Ilib/ethdev -I../lib/ethdev -I. -I.. -Iconfig
-I../config -Ilib/eal/include -I../lib/eal/include
-Ilib/eal/linux/include -I../lib/eal/linux/include
-Ilib/eal/arm/include -I../lib/eal/arm/include -Ilib/eal/common
-I../lib/eal/common -Ilib/eal -I../lib/eal -Ilib/kvargs
-I../lib/kvargs -Ilib/metrics -I../lib/metrics -Ilib/telemetry
-I../lib/telemetry -Ilib/net -I../lib/net -Ilib/mbuf -I../lib/mbuf
-Ilib/mempool -I../lib/mempool -Ilib/ring -I../lib/ring -Ilib/meter
-I../lib/meter -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64
-Wall -Winvalid-pch -Werror -O3 -include rte_config.h -Wextra
-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-packed-not-aligned
-Wno-missing-field-initializers -D_GNU_SOURCE -fPIC
-march=armv8.1-a+crc+crypto -mcpu=thunderx2t99
-DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation
-DCC_SVE_SUPPORT -march=armv8.2-a+sve -MD -MQ
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o -MF
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o.d -o
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o -c
../drivers/net/hns3/hns3_rxtx_vec_sve.c
cc1: error: switch ‘-mcpu=armv8.1-a’ conflicts with ‘-march=armv8.2-a’
switch [-Werror]
../drivers/net/hns3/hns3_rxtx_vec_sve.c:5:10: fatal error: arm_sve.h:
No such file or directory
    5 | #include <arm_sve.h>
      |          ^~~~~~~~~~~
cc1: all warnings being treated as errors
compilation terminated.

I see a similar issue on my fc32, cross compiling with following gcc:
$ aarch64-linux-gnu-gcc --version
aarch64-linux-gnu-gcc (GNU Toolchain for the A-profile Architecture
8.3-2019.03 (arm-rel-8.36)) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[74/503] Compiling C object
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o
FAILED: drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o
aarch64-linux-gnu-gcc -Idrivers/net/hns3/libhns3_sve_lib.a.p
-Idrivers/net/hns3 -I../../dpdk/drivers/net/hns3 -Ilib/ethdev
-I../../dpdk/lib/ethdev -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/arm/include
-I../../dpdk/lib/eal/arm/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
-Ilib/net -I../../dpdk/lib/net -Ilib/mbuf -I../../dpdk/lib/mbuf
-Ilib/mempool -I../../dpdk/lib/mempool -Ilib/ring
-I../../dpdk/lib/ring -Ilib/meter -I../../dpdk/lib/meter
-fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall
-Winvalid-pch -Werror -O2 -g -include rte_config.h -Wextra -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-packed-not-aligned
-Wno-missing-field-initializers -D_GNU_SOURCE -fPIC -march=armv8-a+crc
-DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation
-DCC_SVE_SUPPORT -march=armv8.2-a+sve -MD -MQ
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o -MF
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o.d -o
drivers/net/hns3/libhns3_sve_lib.a.p/hns3_rxtx_vec_sve.c.o -c
../../dpdk/drivers/net/hns3/hns3_rxtx_vec_sve.c
../../dpdk/drivers/net/hns3/hns3_rxtx_vec_sve.c:5:10: fatal error:
arm_sve.h: No such file or directory
 #include <arm_sve.h>
          ^~~~~~~~~~~
compilation terminated.

-- 
David Marchand