From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 881B91B4F7; Tue, 16 Apr 2019 17:39:39 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Apr 2019 08:39:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,358,1549958400"; d="scan'208";a="131897849" Received: from silpixa00399752.ir.intel.com (HELO silpixa00399752.ger.corp.intel.com) ([10.237.222.212]) by orsmga007.jf.intel.com with ESMTP; 16 Apr 2019 08:39:37 -0700 From: Ferruh Yigit To: Thomas Monjalon , John McNamara , Marko Kovacevic Cc: dev@dpdk.org, stable@dpdk.org Date: Tue, 16 Apr 2019 16:39:32 +0100 Message-Id: <20190416153932.21788-2-ferruh.yigit@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190416153932.21788-1-ferruh.yigit@intel.com> References: <20190410140058.26782-1-ferruh.yigit@intel.com> <20190416153932.21788-1-ferruh.yigit@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH v2 2/2] build: fix crash by disabling AVX512 with binutils 2.31 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Apr 2019 15:39:40 -0000 On Skylake platform, with native build, KNI kernel module crashes because of the corrupted values passed to kernel module. The corruption occurs because the userspace kni library works unexpectedly. Compiler [1] is using AVX512 instructions and generated binary is wrong [2]. It turned around gcc does its job correct, but gas is generating binary wrong. And expected binutils 2.30, 2.31 & 2.31.1 are affected. Issue has been fixed in binutils 2.32 with: Commit x86: don't mistakenly scale non-8-bit displacements AVX512 was already disabled with bintuils 2.30 [3], extending it to 2.31 & 2.31.1 too. [1] gcc (GCC) 8.3.1 20190223 (Red Hat 8.3.1-2) [2] gcc bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028 [3] Bugzilla ID 97 has the details. Bugzilla ID: 249 Cc: stable@dpdk.org Signed-off-by: Ferruh Yigit --- v2: * Release notes "Known Issues" section updated --- config/x86/meson.build | 6 ++++++ doc/guides/rel_notes/release_19_05.rst | 6 ++++++ mk/toolchain/gcc/rte.toolchain-compat.mk | 9 ++++++++- 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/config/x86/meson.build b/config/x86/meson.build index 692aebe7a..9e9d5dc8c 100644 --- a/config/x86/meson.build +++ b/config/x86/meson.build @@ -10,6 +10,12 @@ if host_machine.system() != 'windows' message('Binutils 2.30 detected, disabling AVX512 support as workaround for bug #97') endif endif + if ldver.contains('2.31') + if cc.has_argument('-mno-avx512f') + machine_args += '-mno-avx512f' + message('Binutils 2.31 detected, disabling AVX512 support as workaround for bug #249') + endif + endif endif # we require SSE4.2 for DPDK diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst index 25cd61ca2..cf04b9b26 100644 --- a/doc/guides/rel_notes/release_19_05.rst +++ b/doc/guides/rel_notes/release_19_05.rst @@ -338,6 +338,12 @@ Known Issues Also, make sure to start the actual text at the margin. ========================================================= +* **On x86 platforms, AVX512 support is disabled with binutils 2.31** + + Because a defect in binutils 2.31 AVX512 support is disabled. + DPDK defect: https://bugs.dpdk.org/show_bug.cgi?id=249 + GCC defect: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028 + * **No software AES-XTS implementation.** There are currently no cryptodev software PMDs available which implement diff --git a/mk/toolchain/gcc/rte.toolchain-compat.mk b/mk/toolchain/gcc/rte.toolchain-compat.mk index df71e4a8b..ea40a11c0 100644 --- a/mk/toolchain/gcc/rte.toolchain-compat.mk +++ b/mk/toolchain/gcc/rte.toolchain-compat.mk @@ -27,7 +27,14 @@ ifneq ($(filter 2.30%,$(LD_VERSION)),) FORCE_DISABLE_AVX512 := y # print warning only once for librte_eal ifneq ($(filter %librte_eal,$(CURDIR)),) -$(warning AVX512 support disabled because of ld 2.30. See Bug 97) +$(warning AVX512 support disabled because of binutils 2.30. See Bug 97) +endif +endif +ifneq ($(filter 2.31%,$(LD_VERSION)),) +FORCE_DISABLE_AVX512 := y +# print warning only once for librte_eal +ifneq ($(filter %librte_eal,$(CURDIR)),) +$(warning AVX512 support disabled because of binutils 2.31. See Bug 249) endif endif endif -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id F3C6AA00E6 for ; Tue, 16 Apr 2019 17:39:53 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 716B21B510; Tue, 16 Apr 2019 17:39:46 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 881B91B4F7; Tue, 16 Apr 2019 17:39:39 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Apr 2019 08:39:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,358,1549958400"; d="scan'208";a="131897849" Received: from silpixa00399752.ir.intel.com (HELO silpixa00399752.ger.corp.intel.com) ([10.237.222.212]) by orsmga007.jf.intel.com with ESMTP; 16 Apr 2019 08:39:37 -0700 From: Ferruh Yigit To: Thomas Monjalon , John McNamara , Marko Kovacevic Cc: dev@dpdk.org, stable@dpdk.org Date: Tue, 16 Apr 2019 16:39:32 +0100 Message-Id: <20190416153932.21788-2-ferruh.yigit@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190416153932.21788-1-ferruh.yigit@intel.com> References: <20190410140058.26782-1-ferruh.yigit@intel.com> <20190416153932.21788-1-ferruh.yigit@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-dev] [PATCH v2 2/2] build: fix crash by disabling AVX512 with binutils 2.31 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Content-Type: text/plain; charset="UTF-8" Message-ID: <20190416153932.BYKPiWWtPI-MtAhF-QEj4wx8nlcympUM43Iv67tzqUo@z> On Skylake platform, with native build, KNI kernel module crashes because of the corrupted values passed to kernel module. The corruption occurs because the userspace kni library works unexpectedly. Compiler [1] is using AVX512 instructions and generated binary is wrong [2]. It turned around gcc does its job correct, but gas is generating binary wrong. And expected binutils 2.30, 2.31 & 2.31.1 are affected. Issue has been fixed in binutils 2.32 with: Commit x86: don't mistakenly scale non-8-bit displacements AVX512 was already disabled with bintuils 2.30 [3], extending it to 2.31 & 2.31.1 too. [1] gcc (GCC) 8.3.1 20190223 (Red Hat 8.3.1-2) [2] gcc bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028 [3] Bugzilla ID 97 has the details. Bugzilla ID: 249 Cc: stable@dpdk.org Signed-off-by: Ferruh Yigit --- v2: * Release notes "Known Issues" section updated --- config/x86/meson.build | 6 ++++++ doc/guides/rel_notes/release_19_05.rst | 6 ++++++ mk/toolchain/gcc/rte.toolchain-compat.mk | 9 ++++++++- 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/config/x86/meson.build b/config/x86/meson.build index 692aebe7a..9e9d5dc8c 100644 --- a/config/x86/meson.build +++ b/config/x86/meson.build @@ -10,6 +10,12 @@ if host_machine.system() != 'windows' message('Binutils 2.30 detected, disabling AVX512 support as workaround for bug #97') endif endif + if ldver.contains('2.31') + if cc.has_argument('-mno-avx512f') + machine_args += '-mno-avx512f' + message('Binutils 2.31 detected, disabling AVX512 support as workaround for bug #249') + endif + endif endif # we require SSE4.2 for DPDK diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst index 25cd61ca2..cf04b9b26 100644 --- a/doc/guides/rel_notes/release_19_05.rst +++ b/doc/guides/rel_notes/release_19_05.rst @@ -338,6 +338,12 @@ Known Issues Also, make sure to start the actual text at the margin. ========================================================= +* **On x86 platforms, AVX512 support is disabled with binutils 2.31** + + Because a defect in binutils 2.31 AVX512 support is disabled. + DPDK defect: https://bugs.dpdk.org/show_bug.cgi?id=249 + GCC defect: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90028 + * **No software AES-XTS implementation.** There are currently no cryptodev software PMDs available which implement diff --git a/mk/toolchain/gcc/rte.toolchain-compat.mk b/mk/toolchain/gcc/rte.toolchain-compat.mk index df71e4a8b..ea40a11c0 100644 --- a/mk/toolchain/gcc/rte.toolchain-compat.mk +++ b/mk/toolchain/gcc/rte.toolchain-compat.mk @@ -27,7 +27,14 @@ ifneq ($(filter 2.30%,$(LD_VERSION)),) FORCE_DISABLE_AVX512 := y # print warning only once for librte_eal ifneq ($(filter %librte_eal,$(CURDIR)),) -$(warning AVX512 support disabled because of ld 2.30. See Bug 97) +$(warning AVX512 support disabled because of binutils 2.30. See Bug 97) +endif +endif +ifneq ($(filter 2.31%,$(LD_VERSION)),) +FORCE_DISABLE_AVX512 := y +# print warning only once for librte_eal +ifneq ($(filter %librte_eal,$(CURDIR)),) +$(warning AVX512 support disabled because of binutils 2.31. See Bug 249) endif endif endif -- 2.20.1