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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)(39860400002)(396003)(376002)(136003)(346002)(46966005)(4326008)(52536014)(336012)(7696005)(82310400002)(356005)(8676002)(5660300002)(36906005)(54906003)(86362001)(478600001)(316002)(83380400001)(55016002)(8936002)(9686003)(6506007)(47076004)(82740400003)(26005)(186003)(33656002)(81166007)(6862004)(70206006)(70586007)(2906002)(53546011); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2020 09:05:31.1459 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da1512b2-f6c0-4c3a-1804-08d840313231 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: VE1EUR03FT006.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB4544 Subject: Re: [dpdk-dev] [RFC PATCH] config: remap flags used for Arm platforms 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" > -----Original Message----- > From: Bruce Richardson > Sent: Friday, August 14, 2020 4:13 PM > To: Ruifeng Wang > Cc: hemant.agrawal@nxp.com; jerinj@marvell.com; > viktorin@rehivetech.com; dev@dpdk.org; Honnappa Nagarahalli > ; Phil Yang ; nd > > Subject: Re: [dpdk-dev] [RFC PATCH] config: remap flags used for Arm > platforms >=20 > On Fri, Aug 14, 2020 at 02:03:20PM +0800, Ruifeng Wang wrote: > > Flags are used to distinguish different platform architectures. > > These flags can be used to pick different code paths for different > > architectures at compile time. > > For Arm platforms, there are 3 flags in use: RTE_ARCH_ARM, > > RTE_ARCH_ARMv7 and RTE_ARCH_ARM64. > > RTE_ARCH_ARM64 is used to flag 64-bit aarch64 platforms, while > > RTE_ARCH_ARM & RTE_ARCH_ARMv7 are used to flag 32-bit platforms. > > RTE_ARCH_ARMv7 is for ARMv7 platforms as its name suggested. > > > > The issue is that flag name RTE_ARCH_ARM is unclear and could cause > > confusion. No info about platform word length is included in the name. > > To make the flag names more clear, a naming scheme is proposed. > > > > RTE_ARCH_ARM > > | > > +----RTE_ARCH_ARM32 > > | | > > | +----RTE_ARCH_ARMv7 > > | | > > | +----RTE_ARCH_ARMv8_AARCH32 > > | > > +----RTE_ARCH_ARM64 > > > > RTE_ARCH_ARM32 will be used for 32-bit Arm platforms. > > It includes RTE_ARCH_ARMv7 and RTE_ARCH_ARMv8_AARCH32. > > RTE_ARCH_ARMv7 is for ARMv7 platforms. > > RTE_ARCH_ARMv8_AARCH32 is for aarch32 state on aarch64 platforms. > > RTE_ARCH_ARM64 is for 64-bit Arm platforms. > > RTE_ARCH_ARM will be used for all Arm platforms, including > > RTE_ARCH_ARM32 and RTE_ARCH_ARM64. > > > > To fit into the new naming scheme, current usage of RTE_ARCH_ARM in > > project code is mapped to RTE_ARCH_ARM32. > > > > Suggested-by: Honnappa Nagarahalli > > Signed-off-by: Ruifeng Wang > > Reviewed-by: Phil Yang > > --- > Just to note that for all architectures there is the RTE_ARCH_64 define w= hich > is set if the system is 64-bit. That could be used instead if you didn't = want to > have to specially define ARM32 and ARM64 macros. >=20 Yes. Thanks for the note.=20 RTE_ARCH_ARM64 is used in architecture specific cases. For example, when a = processing=20 path is not implemented by some of 64-bit architectures, RTE_ARCH_64 is not= sufficient. > /Bruce