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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(376002)(346002)(396003)(136003)(39850400004)(36840700001)(46966006)(82740400003)(356005)(7696005)(5660300002)(9686003)(81166007)(966005)(478600001)(47076005)(33656002)(8936002)(82310400003)(316002)(2906002)(8676002)(186003)(336012)(55016002)(54906003)(36860700001)(110136005)(26005)(4326008)(83380400001)(70586007)(70206006)(6506007)(52536014)(86362001); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 May 2021 19:43:10.5257 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b9c5fbdc-c90a-4394-7daa-08d914b50207 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT053.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAXPR08MB6702 Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] config/arm: add ability to express arch extensions X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 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" >=20 > >> >> > >> >> > > >> >> > The patch still holds true for CRC though as it is listed > >> >> > separately below > >> >> > https://urldefense.proofpoint.com/v2/url?u=3Dhttps- > >> >3A__developer.arm.com_architectures_cpu-2Darchitecture_a- > >> >2D&d=3DDwIFAg&c=3DnKjWec2b6R0mOyPaz7xtfQ&r=3DE3SgYMjtKCMVsB- > >> >fmvgGV3o- > >> > >>g_fjLhk5Pupi9ijohpc&m=3Di3kC8htMiHjXMoJWUn6QlDVZQCblbFrIJyMc > >W > >> > >>d9nAmM&s=3DfA4SM6O3iC2HXIK1qSbOHzxVeHoYqcfUebEOwioHC7c&e > >=3D > >> >> > profile/exploration-tools/feature-names-for-a-profile > >> >CRC is mandatory starting in V8.1, refer to Arm-ARM document. > >> > > >> >> > > >> >> > Also, looks like sve2 support in n2 core might be optional as > >> >> > per > >> >above doc? > >> >> I need to check on this. Some of the info here might not be public > >yet. > >> >I found [1]. SVE2 is mandatory feature. > >> > > >> > >> I see thanks for the info I will remove extension from cnxk. > >> > >> Do you think the extension infra is still useful for other cases? i.e. > >older cores > >> or cases where vendor wants to enable some extensions by default? > >> > >> I found a document[1] which describes about extensions not enabled > >by > >> default but supported by a given march. > >> In case of n2 I think memory tagging is one such feature > >I think the reference is providing a different information than what > >you are trying to achieve here. > > > >It looks like you are trying to address a use case where in the same > >CPU IP has different features enabled/disabled on different SoCs. > >This is a valid use case from crypto perspective (due to export control > >reasons) where-in 2 different SoCs might have crypto enabled/disabled. > >I am not sure if other features can be enabled/disabled. But, Crypto > >feature is a good enough reason to address such a use case. >=20 > Yes, that's my intension apologies if the commit log doesn't clarify it p= roperly. >=20 > > > >IMO, we should capture the SoC specific details in SoC specific files, > >in this case in 'arm64_cn10k_linux_gcc'. I believe there were some > >challenges in doing this. >=20 > Since, all the flags are populated through soc_* variable and > arm64_cn10k_linux_gcc also translates to soc_cn10k I believe the extensio= ns > should be reported through > soc_* variables. IMO, there will be more SoCs in the future. I prefer to not grow meson.buil= d.=20 >=20 > Also, do you think +crypto needs to be removed from default n2 config as = its > optional? Agree. Better to move it to SoC specific configuration. >=20 > >Juraj, do you remember the exact issue? > > > >> > >> [1]https://urldefense.proofpoint.com/v2/url?u=3Dhttps- > >3A__developer.arm.com_tools-2Dand-2Dsoftware_open-2Dsource- > >2D&d=3DDwIFAg&c=3DnKjWec2b6R0mOyPaz7xtfQ&r=3DE3SgYMjtKCMVsB- > >fmvgGV3o-g_fjLhk5Pupi9ijohpc&m=3D0oZnXDnO- > >oYL9lESEaZt_nH_kK8Nc3m0tvdEPpKeFZc&s=3DWxrPoWhkM2QIFGEKezPK > >D9oEn7nGFvvgS2ul9ZYx-Kg&e=3D > >> software/developer-tools/gnu-toolchain/architecture-support > >> > >> > >> >[1] https://urldefense.proofpoint.com/v2/url?u=3Dhttps- > >> >3A__developer.arm.com_ip- > >> >2Dproducts_processors_neoverse_neoverse- > >> > >>2Dn2&d=3DDwIFAg&c=3DnKjWec2b6R0mOyPaz7xtfQ&r=3DE3SgYMjtKCMVsB > >- > >> >fmvgGV3o- > >> > >>g_fjLhk5Pupi9ijohpc&m=3Di3kC8htMiHjXMoJWUn6QlDVZQCblbFrIJyMc > >W > >> >d9nAmM&s=3DkP_X-Co0cl4pZ64BZqy5rAFUlkMZE- > >3EhTVBabm3SW8&e=3D > >> > > >> >