> -----Original Message----- > From: Jan Viktorin [mailto:viktorin at rehivetech.com] > Sent: Tuesday, November 03, 2015 10:36 AM > To: Ananyev, Konstantin > Cc: Jerin Jacob; dev at dpdk.org; thomas.monjalon at 6wind.com; Hunt, David > Subject: Re: [PATCH 2/3] arm64: acl: add neon based acl implementation > > On Tue, 3 Nov 2015 10:23:55 +0000 > "Ananyev, Konstantin" <konstantin.ananyev at intel.com> wrote: > > > > Hi Konstantin, > > > > > > > > On ARM, is there any specific cpu flag that you can use to determine is > > > > NEON > > > > isa is supported or not? > > > > > > Yes, on armv7(RTE_CPUFLAG_NEON). On armv8-a NEON is mandatory. > > > > > > > It would be good to avoid extra conditional compilation here if > > > > possible. > > > neon acl is verified/ported only on armv8. While adding the armv7 support > > > the > > > check can be extended for cpuflag based on RTE_CPUFLAG_NEON on armv7 > > > > Ok, and is there a flag that allows to distinguish between armv7 and arm8 > > then at runtime? > > It is probably ok like that, but with all that conditional compilations it > > gets too messy. > > Another thing - if you can distinguish between armv7 and armv8 at runtime, > > then you probably > > can set alg = RTE_ACL_CLASSIFY_DEFAULT for armv7 and alg = > > RTE_ACL_CLASSIFY_NEON for arm8? > > Konstantin > > The ARMv7 provides "v7l" in the AT_PLATFORM and the ARMv8 gives > "aarach64". However, I am afraid, as these are two distinct platforms > (with distinct cpuflags), we cannot use the cpuflags easily for this. >
Ok, if you think it is unavoidable - let's keep it like that for now. > Is there an API in DPDK which allows to ask globally: "what platform am > I running on?"? Not that I am aware about. Konstantin > > Jan > > > > > > > > > > Another question - did I get it right that NEON isa is supported on all > > > > possible RTE_ARCH_ARM64 cpu models you plan to support? > > > > > > Yes > > > -- > Jan Viktorin E-mail: Viktorin at RehiveTech.com > System Architect Web: www.RehiveTech.com > RehiveTech > Brno, Czech Republic
