[dpdk-dev] [dpdk-stable] [PATCH v2] build: disable armv8 crypto extension

Honnappa Nagarahalli Honnappa.Nagarahalli at arm.com
Tue May 7 13:03:37 CEST 2019

> > Subject: [EXT] Re: [dpdk-stable] [PATCH v2] build: disable armv8
> > crypto extension
> >
> > > On May 3, 2019, at 10:50 AM, Yongseok Koh <yskoh at mellanox.com>
> > wrote:
> > >
> > >> I think this change might have an impact on the existing users.
> > >> Does this change need to be documented somewhere (at least in the
> > >> release
> > notes)?
> > >
> > > Practically, there would be no impact. Even if user's app makes use
> > > of crypto instructions, the build config of the app should have the flag.
> >
> > On IRC, I could see you concerned about the case where user app
> > derives build flags from DPDK like apps under the examples directory.
> > Yes, that's a valid concern.
> Is there any DPDK example application would depend on the armv8 crypto
> flags? IMO, None of the applications are directly using armv8 crypto
It is not about DPDK's example application. We have control over that.

> instruction. Even such as comes for any external DPDK app which is not in
> dpdk.org tree then it can be added in APP makefile.
> IMO, app writes should be aware of the need for using +crypto if he/she
> using the crypto instruction.
Agree. But, it might be that the app writer might have depended on the +crypto coming from DPDK build system, in which case, she/he needs to know the change through release notes?

I do not think it needs to be documented anywhere else.

> >
> > Thomas/Jerin, where could be the best spot to document it? Just
> > release note?
> > I think release note would be fine.

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