[dpdk-dev] [PATCH v2 2/3] eal/acl: enable acl for armv7-a

[Jan Viktorin]

  Původní zpráva  
Od: Thomas Monjalon
Odesláno: úterý, 8. prosince 2015 11:04
Komu: Jianbo Liu
Kopie: dev at dpdk.org; Jan Viktorin; Jerin Jacob
Předmět: Re: [dpdk-dev] [PATCH v2 2/3] eal/acl: enable acl for armv7-a

2015-12-08 15:56, Jianbo Liu:
> On 8 December 2015 at 10:23, Thomas Monjalon <thomas.monjalon at 6wind.com> wrote:
> > 2015-12-08 09:50, Jianbo Liu:
> >> On 8 December 2015 at 09:18, Thomas Monjalon <thomas.monjalon at 6wind.com> wrote:
> >> > 2015-12-03 23:02, Jianbo Liu:
> >> >> -ifeq ($(CONFIG_RTE_ARCH_ARM64),y)
> >> >> +ifneq ($(filter y,$(CONFIG_RTE_ARCH_ARM) $(CONFIG_RTE_ARCH_ARM64)),)
> >> > [...]
> >> >> +#ifdef RTE_ARCH_ARM
> >> >> +/* NEON intrinsic vqtbl1q_u8() is not supported in ARMv7-A(AArch32) */
> >> >
> >> > I'm convinced there is a good reason why ARMv8 is also called ARCH_ARM64,
> >> > and ARMv7 may be called AArch32 or ARCH_ARM. But I don't know why?
> >> >
> >> https://lkml.org/lkml/2012/7/15/133
> >>
> >> > Is ARCH_ARM32 or ARCH_ARMv7 too simple?
> >> > Is it possible to have a 32-bit ARMv8?
> >> Yes, ARMv8-R/M
> >
> > So what does mean CONFIG_RTE_ARCH_ARM?
> > ARMv7? ARM32?
> > Please consider a renaming.
> 
> I'd rather not renaming becase it can be both ARMv7 and AARCH32, which
> are ISA compatibility.
> If further differentiation is needed, CONFIG_RTE_ARCH_ARMv7 is added
> in the config, just like Jan Viktorin did.

>> I don't understand.
>> You say CONFIG_RTE_ARCH_ARM is for ARMv7 and AARCH32, right?
>> Both are 32-bit right?
>> Why not rename it to CONFIG_RTE_ARCH_ARM32?

Hello,

CONFIG_RTE_ARCH_ARMv7 entry specifies the certain architecture, subset of CONFIG_RTE_ARCH_ARM (which is 32b).

For ARM64 we can differentiate among architectures v8, v9, ..., v64 :) as well.

However, I doubt somebody will use dpdk on ARMv6.

IMO, the major options should be CONFIG_RTE_ARCH_ARM and CONFIG_RTE_ARCH_ARM64.

Jan Viktorin
RehiveTech
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