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Thu, 3 Jan 2019 22:46:39 +0000 From: Yongseok Koh To: Ferruh Yigit CC: Thomas Monjalon , dev , dpdk stable , Tom Barbette , Konstantin Ananyev , Bruce Richardson Thread-Topic: [PATCH v3] mk: fix scope of disabling AVX512F support Thread-Index: AQHUo4ClmXTX/jCB6kW4jRUuxr2Rc6WeJV4A Date: Thu, 3 Jan 2019 22:46:39 +0000 Message-ID: <3DB9B601-F207-43B6-9237-F4630781FE78@mellanox.com> References: <20181219210028.60219-1-ferruh.yigit@intel.com> <20190103162313.85623-1-ferruh.yigit@intel.com> In-Reply-To: <20190103162313.85623-1-ferruh.yigit@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=yskoh@mellanox.com; x-originating-ip: [69.181.245.183] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; DB3PR0502MB4090; 6:8abV8DF9LC2SfUbaVtI7QguJk/d1PjRP7pnIEmExOiL+JGt53ErClft7AZ71Q27/OIJEhkpzZ44+D0G+dXIQ4cF6RM14URDQgiw6wcJ1pjLCAKnPuj7svdTLKA/RUPLJHB5VOKmJLM17LaKJ3SVKoJd2rKNg3W7oTQ5CrR+2GR+aEJFbOBWikpewE6QO7Zd1NlYUueHlkKsFMFbAgALNrxUHzpMcQS9LCmEYJLK2asl3O7bBcIw+EKvMfRcRXJpmBwD6HqNbyR3SOs6N7MDNwMQePqrMl1wJEco/GkQf0C5b/GIy7JAq4RvCvZL5tEIz0rvVQdfHAKwx3WwETj4cKEQuAdSchGuq1flYX5hBQ/RL+gU6/PRTiamFfqZDJJej8AgcQbgZ7mhlRWmHeWe0ZX9NQ2KT2uSCaYGgQs7L3ADe8h4OBIcQ0lXm2uoiF7CuFfsyAPwKozUJB1p+eObCJQ==; 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charset="us-ascii" Content-ID: <23C64BE100CBC64BB2853E2B48215576@eurprd05.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 823a4745-c3bc-41f3-635b-08d671cd530f X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Jan 2019 22:46:39.3504 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR0502MB4090 Subject: Re: [dpdk-stable] [PATCH v3] mk: fix scope of disabling AVX512F support X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 Jan 2019 22:46:42 -0000 > On Jan 3, 2019, at 8:23 AM, Ferruh Yigit wrote: >=20 > AVX512 was disabled for GCC because of Bugzilla issue 97 [1], > the GCC defect submitted for the issue [2] highlighted that this is > a known binutils version 2.30 issue. >=20 > Narrowed the scope of no-avx512 to the this specific binutils version. >=20 > [1] > https://emea01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbugs= .dpdk.org%2Fshow_bug.cgi%3Fid%3D97&data=3D02%7C01%7Cyskoh%40mellanox.co= m%7C9e8d0eb500ca4cb74c1508d67197c6b0%7Ca652971c7d2e4d9ba6a4d149256f461b%7C0= %7C0%7C636821294022213177&sdata=3DRxj7HxBWfp4hMzfRkiGtnSYt8N0TG9xnAL0ZY= BpYYa0%3D&reserved=3D0 >=20 > [2] > https://emea01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgcc.= gnu.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D88096&data=3D02%7C01%7Cyskoh%4= 0mellanox.com%7C9e8d0eb500ca4cb74c1508d67197c6b0%7Ca652971c7d2e4d9ba6a4d149= 256f461b%7C0%7C0%7C636821294022213177&sdata=3DEqzsamoYfFve5JAsgyWw51JOB= hhiKTOCrnfZoYTGN28%3D&reserved=3D0 >=20 > Fixes: 8d07c82b239f ("mk: disable gcc AVX512F support") > Cc: stable@dpdk.org >=20 > Signed-off-by: Ferruh Yigit > --- Acked-by: Yongseok Koh =20 Thanks > Cc: Tom Barbette > Cc: Thomas Monjalon > Cc: Yongseok Koh > Cc: Konstantin Ananyev > Cc: Bruce Richardson >=20 > v2: > * Added warning message (print only once for eal) > * Moved decision details to compat file, kept execution in cpuflags >=20 > v3: > * replace 'ld' with '$(LD)' for cross build > * added meson support > --- > config/meson.build | 8 ++++++++ > mk/rte.cpuflags.mk | 4 ++-- > mk/toolchain/gcc/rte.toolchain-compat.mk | 10 ++++++++++ > 3 files changed, 20 insertions(+), 2 deletions(-) >=20 > diff --git a/config/meson.build b/config/meson.build > index db32499b3..40802fc88 100644 > --- a/config/meson.build > +++ b/config/meson.build > @@ -43,6 +43,14 @@ toolchain =3D cc.get_id() > dpdk_conf.set_quoted('RTE_TOOLCHAIN', toolchain) > dpdk_conf.set('RTE_TOOLCHAIN_' + toolchain.to_upper(), 1) >=20 > +# get binutils version for the workaround of Bug 97 > +ldver =3D run_command('ld', '-v').stdout().strip() > +if ldver.contains('2.30') > + if cc.has_argument('-mno-avx512f') > + machine_args +=3D '-mno-avx512f' > + endif > +endif > + > add_project_link_arguments('-Wl,--no-as-needed', language: 'c') > dpdk_extra_ldflags +=3D '-Wl,--no-as-needed' >=20 > diff --git a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk > index c3291b17a..541211c61 100644 > --- a/mk/rte.cpuflags.mk > +++ b/mk/rte.cpuflags.mk > @@ -69,8 +69,8 @@ ifneq ($(filter $(AUTO_CPUFLAGS),__AVX512F__),) > ifeq ($(CONFIG_RTE_ENABLE_AVX512),y) > CPUFLAGS +=3D AVX512F > else > -# disable AVX512F support of gcc as a workaround for Bug 97 > -ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y) > +# disable AVX512F support for GCC & binutils 2.30 as a workaround for Bu= g 97 > +ifeq ($(FORCE_DISABLE_AVX512),y) > MACHINE_CFLAGS +=3D -mno-avx512f > endif > endif > diff --git a/mk/toolchain/gcc/rte.toolchain-compat.mk b/mk/toolchain/gcc/= rte.toolchain-compat.mk > index 44904295c..33ea3f03a 100644 > --- a/mk/toolchain/gcc/rte.toolchain-compat.mk > +++ b/mk/toolchain/gcc/rte.toolchain-compat.mk > @@ -20,6 +20,16 @@ HOST_GCC_MINOR =3D $(shell echo __GNUC_MINOR__ | $(HOS= TCC) -E -x c - | tail -n 1) > HOST_GCC_PATCHLEVEL =3D $(shell echo __GNUC_PATCHLEVEL__ | $(HOSTCC) -E -= x c - | tail -n 1) > HOST_GCC_VERSION =3D $(HOST_GCC_MAJOR)$(HOST_GCC_MINOR) >=20 > +LD_VERSION =3D $(shell $(LD) -v) > +# disable AVX512F support for GCC & binutils 2.30 as a workaround for Bu= g 97 > +ifneq ($(filter 2.30%,$(LD_VERSION)),) > +FORCE_DISABLE_AVX512 :=3D y > +# print warning only once for librte_eal > +ifneq ($(filter %librte_eal,$(lastword $(CURDIR))),) > +$(warning AVX512 support disabled because of ld 2.30. See Bug 97) > +endif > +endif > + > # if GCC is older than 4.x > ifeq ($(shell test $(GCC_VERSION) -lt 40 && echo 1), 1) > MACHINE_CFLAGS =3D > --=20 > 2.17.2 >=20