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From: Olivier Matz <olivier.matz@6wind.com>
To: David Marchand <david.marchand@redhat.com>
Cc: Luca Boccassi <bluca@debian.org>,
	Christian Ehrhardt <christian.ehrhardt@canonical.com>,
	dev <dev@dpdk.org>, dpdk stable <stable@dpdk.org>,
	Kevin Traynor <ktraynor@redhat.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	Stanislaw Kardach <kda@semihalf.com>
Subject: Re: [dpdk-dev] [PATCH 0/3] add lock-free stack support discovery
Date: Mon, 3 May 2021 16:28:57 +0200
Message-ID: <20210503142857.GB1726@platinum> (raw)
In-Reply-To: <CAJFAV8xHV=4LpF06Gzf8mb0aK=XkJQRGsuqOS4Nh0LToBCDCyA@mail.gmail.com>

On Mon, May 03, 2021 at 04:21:25PM +0200, David Marchand wrote:
> On Mon, Apr 12, 2021 at 10:29 AM Stanislaw Kardach <kda@semihalf.com> wrote:
> >
> > The lock-free stack implementation (RTE_STACK_F_LF) is supported only on a
> > subset of platforms, namely x86_64 and arm64. Platforms supporting 128b atomics
> > have to opt-in to a generic or C11 implementations. All other platforms use a
> > stubbed implementation for push/pop operations which are basically NOPs.
> > However rte_stack_create() will not fail and application can proceed assuming
> > it has a working lock-free stack.
> >
> > This means that among other things the stack_lf fast and perf tests will fail
> > as if implementation is wrong (which one can argue is). Therefore this patchset
> > tries to give user a way to check whether a lock_free is supported or not both
> > at compile time (build flag) and at runtime (ENOTSUP errno in rte_stack_create).
> >
> > I have added cc to stable@dpdk.org because check-git-log.sh suggested it. I'm
> > not sure if adding a binary compatible change to API is worth stable@dpdk.org.
> >
> > Cc: stable@dpdk.org
> 
> The issue was hit while porting to a new architecture.
> The feature is broken in existing stable releases and it won't get
> fixed by this change.
> 
> I'd rather not backport it.
> 
> Opinions?

Agreed.

  reply	other threads:[~2021-05-03 14:29 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-12  8:28 Stanislaw Kardach
2021-04-12  8:28 ` [dpdk-dev] [PATCH 1/3] stack: update lock-free supported archs Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-dev] [PATCH 2/3] stack: add lock-free support indication Stanislaw Kardach
2021-04-27 13:54   ` Olivier Matz
2021-04-12  8:29 ` [dpdk-dev] [PATCH 3/3] test: run lock-free stack tests when supported Stanislaw Kardach
2021-04-27 13:55   ` Olivier Matz
2021-04-16  6:34 ` [dpdk-dev] [PATCH 0/3] add lock-free stack support discovery David Marchand
2021-04-19 14:44   ` Stanisław Kardach
2021-05-03 14:21 ` David Marchand
2021-05-03 14:28   ` Olivier Matz [this message]
2021-05-03 18:34     ` Stanisław Kardach
2021-05-04  6:44       ` David Marchand
2021-05-04  6:44 ` David Marchand

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