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From: "Eads, Gage" <gage.eads@intel.com>
To: Ola Liljedahl <Ola.Liljedahl@arm.com>,
	"stephen@networkplumber.org" <stephen@networkplumber.org>
Cc: "arybchenko@solarflare.com" <arybchenko@solarflare.com>,
	nd <nd@arm.com>,
	 "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	"Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>
Subject: Re: [dpdk-dev] [PATCH v4] doc: announce ring API change
Date: Fri, 10 May 2019 16:28:16 +0000	[thread overview]
Message-ID: <9184057F7FC11744A2107296B6B8EB1E68CB4A66@fmsmsx101.amr.corp.intel.com> (raw)
In-Reply-To: <d88b1c63a421e72d14cd1bd790f98333a6f34f33.camel@arm.com>

> -----Original Message-----
> From: Ola Liljedahl [mailto:Ola.Liljedahl@arm.com]
> Sent: Friday, May 10, 2019 10:19 AM
> To: stephen@networkplumber.org; Eads, Gage <gage.eads@intel.com>
> Cc: arybchenko@solarflare.com; nd <nd@arm.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>; thomas@monjalon.net; Richardson,
> Bruce <bruce.richardson@intel.com>; dev@dpdk.org;
> olivier.matz@6wind.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; Gavin Hu (Arm Technology China)
> <Gavin.Hu@arm.com>
> Subject: Re: [dpdk-dev] [PATCH v4] doc: announce ring API change
> 
> On Fri, 2019-05-10 at 07:58 -0700, Stephen Hemminger wrote:
> > On Fri, 10 May 2019 14:53:56 +0000
> > "Eads, Gage" <gage.eads@intel.com> wrote:
> >
> > 01/02/2019 15:36, Gage Eads:
> > In order to support the non-blocking ring[1], an API change
> > (additional argument to rte_ring_get_memsize()) is required in
> > librte_ring. This commit updates the deprecation notice to pave the
> > way for its inclusion in 19.08.
> >
> > [1] http://mails.dpdk.org/archives/dev/2019-January/124162.html
> >
> > Signed-off-by: Gage Eads <gage.eads@intel.com>
> >
> > There is still no agreement on this change?
> >
> >
> > Still none. I was hoping this discussion (
> > http://mails.dpdk.org/archives/dev/2019-April/129229.html) would lead
> > to some clear direction, but at this point the effort is stalled.
> >
> > The fundamental tradeoff is between non-blocking rings and ABI breakage.
> 
> It is also possible to do "non-blocking" (but not lock-free) rings with the
> original element size (a pointer per ring slot) as implemented here:
> https://github.com/ARM-
> software/progress64/blob/master/src/p64_ringbuf.c
> Some extra (head&tail) metadata is required but I think there is space for
> that in the rte_ring structure.
> 
> > Why not have a new ring type for non-blocking rings since non-blocking
> > rings are not necessary for all use cases.
> 
> I proposed a new library ("rte_lfring") with lock-free rings here:
> https://mails.dpdk.org/archives/dev/2019-January/124242.html
> The lock-free design should be the same as in Gage's patch.
> 
> rte_lfring could of course be part of the rte_ring library.
> 

Just read through the API/ABI stability discussion (https://mails.dpdk.org/archives/dev/2019-April/128969.html). I'll drop my patchset and work on supporting this lfring API instead.

Thanks,
Gage

> 
> --
> Ola Liljedahl, Networking System Architect, Arm Phone +46706866373, Skype
> ola.liljedahl

  parent reply	other threads:[~2019-05-10 16:28 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-15 23:59 [dpdk-dev] [PATCH] doc: announce ring ABI and API changes Gage Eads
2019-01-16  0:34 ` Stephen Hemminger
2019-01-16 18:21   ` Eads, Gage
2019-01-18 15:28 ` [dpdk-dev] [PATCH v2] doc: announce ring API change Gage Eads
2019-01-18 15:31   ` [dpdk-dev] [PATCH v3] " Gage Eads
2019-02-01 11:16     ` Thomas Monjalon
2019-02-01 14:18       ` Eads, Gage
2019-02-01 14:36     ` [dpdk-dev] [PATCH v4] " Gage Eads
2019-05-09 23:29       ` Thomas Monjalon
2019-05-09 23:29         ` Thomas Monjalon
2019-05-10 14:53         ` Eads, Gage
2019-05-10 14:53           ` Eads, Gage
2019-05-10 14:58           ` Stephen Hemminger
2019-05-10 14:58             ` Stephen Hemminger
2019-05-10 15:19             ` Ola Liljedahl
2019-05-10 15:19               ` Ola Liljedahl
2019-05-10 16:28               ` Eads, Gage [this message]
2019-05-10 16:28                 ` Eads, Gage
2019-05-13 11:46                 ` Olivier Matz
2019-05-13 11:46                   ` Olivier Matz

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