From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>,
Anoob Joseph <anoobj@marvell.com>,
"akhil.goyal@nxp.com" <akhil.goyal@nxp.com>,
"Trahe, Fiona" <fiona.trahe@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
David Marchand <david.marchand@redhat.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"nhorman@tuxdriver.com" <nhorman@tuxdriver.com>,
"Mcnamara, John" <john.mcnamara@intel.com>,
"Kusztal, ArkadiuszX" <arkadiuszx.kusztal@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 4/4] add ABI checks
Date: Thu, 30 Jan 2020 16:42:30 +0000 [thread overview]
Message-ID: <79b14fdb-f583-8a31-59a7-ca9001d687c0@intel.com> (raw)
In-Reply-To: <2118076.C4sosBPzcN@xps>
On 1/30/2020 3:59 PM, Thomas Monjalon wrote:
> 30/01/2020 14:06, Trahe, Fiona:
>> We were unaware the LIST_END change could constitute an ABI breakage, but can see how it affects the array size when picked up.
>> We're exploring options.
>>
>> I agree with Anoob's point that if we don't allow the LIST_END to be modified, then it means no feature can be implemented without ABI breakage.
>> Anyone object to removing those LIST_END elements - or have a better suggestion? Would have to be in 20.11 I suppose.
>
> Yes, having max value right after the last value is ridiculous,
> it prevents adding any value.
> In 20.11, we should remove all these *_END and *_MAX from API enums
> and replace them with a separate #define with reasonnable maximums.
>
>
I disagree, that kind of usage is common and lets loops iterate on the valid
elements, and it is not a source of ABI break on its own.
Indeed other way around, not having MAX, is problematic, if we don't have the
MAX value to compare and decide if a provided value is valid or not, and when
new version of the library introduces the new values, how old application can
detect unsupported new values?
As far as I can see the problem occurs when that *_END and *_MAX used to define
the size of array in the public struct. This usage prevents adding new values
and I already send a deprecation notice for it:
https://patches.dpdk.org/patch/65359/
next prev parent reply other threads:[~2020-01-30 16:42 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 15:20 [dpdk-dev] [PATCH] " David Marchand
2019-12-20 15:32 ` Richardson, Bruce
2019-12-20 16:20 ` Kinsella, Ray
2019-12-20 21:00 ` Thomas Monjalon
2020-01-06 13:17 ` Aaron Conole
2020-01-15 13:07 ` Burakov, Anatoly
2020-01-14 23:19 ` Thomas Monjalon
2020-01-15 11:33 ` Neil Horman
2020-01-15 12:38 ` Thomas Monjalon
2020-01-16 11:52 ` Neil Horman
2020-01-16 14:20 ` Thomas Monjalon
2020-01-16 18:49 ` Neil Horman
2020-01-16 20:01 ` Thomas Monjalon
2020-01-17 19:01 ` Neil Horman
2020-01-17 21:26 ` David Marchand
2019-12-20 20:25 ` Neil Horman
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 0/4] " David Marchand
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 1/4] hash: fix meson headers packaging David Marchand
2020-01-30 10:12 ` Luca Boccassi
2020-01-30 10:54 ` David Marchand
2020-01-30 10:56 ` Luca Boccassi
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 2/4] build: split build helper David Marchand
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 3/4] build: test meson installation David Marchand
2020-01-29 17:26 ` [dpdk-dev] [PATCH v2 4/4] add ABI checks David Marchand
2020-01-29 17:42 ` Thomas Monjalon
2020-01-29 18:10 ` Anoob Joseph
2020-01-29 20:03 ` David Marchand
2020-01-29 20:13 ` Akhil Goyal
2020-01-30 16:09 ` Ferruh Yigit
2020-01-30 20:18 ` Thomas Monjalon
2020-01-31 9:03 ` Ferruh Yigit
2020-01-31 10:26 ` Ananyev, Konstantin
2020-01-31 14:16 ` Trahe, Fiona
2020-02-02 13:05 ` Thomas Monjalon
2020-02-02 14:41 ` Ananyev, Konstantin
2020-02-03 9:30 ` Ferruh Yigit
2020-02-03 11:50 ` Neil Horman
2020-02-03 13:09 ` Ferruh Yigit
2020-02-03 14:00 ` Dodji Seketeli
2020-02-03 14:46 ` Ferruh Yigit
2020-02-03 15:08 ` Trahe, Fiona
2020-02-03 17:09 ` Thomas Monjalon
2020-02-03 17:34 ` Thomas Monjalon
2020-02-03 18:55 ` Ray Kinsella
2020-02-03 21:07 ` Thomas Monjalon
2020-02-04 9:46 ` Ferruh Yigit
2020-02-04 10:24 ` Thomas Monjalon
2020-02-04 12:44 ` Trahe, Fiona
2020-02-04 15:52 ` Trahe, Fiona
2020-02-04 15:59 ` Thomas Monjalon
2020-02-04 17:46 ` Trahe, Fiona
2020-02-13 14:51 ` Kusztal, ArkadiuszX
2020-03-16 12:57 ` Trahe, Fiona
2020-03-16 13:09 ` Thomas Monjalon
2020-03-17 13:27 ` Kusztal, ArkadiuszX
2020-03-17 15:10 ` Thomas Monjalon
2020-03-17 19:10 ` Kusztal, ArkadiuszX
2020-02-04 12:57 ` Kevin Traynor
2020-02-04 14:44 ` Aaron Conole
2020-02-04 19:49 ` Neil Horman
2020-02-04 9:51 ` David Marchand
2020-02-04 10:10 ` Trahe, Fiona
2020-02-04 10:38 ` Thomas Monjalon
2020-02-05 11:10 ` Ray Kinsella
2020-02-03 17:40 ` Ferruh Yigit
2020-02-03 18:40 ` Thomas Monjalon
2020-02-04 9:19 ` Ferruh Yigit
2020-02-04 9:45 ` Thomas Monjalon
2020-02-04 9:56 ` Ferruh Yigit
2020-02-04 10:08 ` Bruce Richardson
2020-02-04 10:17 ` Kevin Traynor
2020-02-04 10:16 ` Akhil Goyal
2020-02-04 10:28 ` Thomas Monjalon
2020-02-04 10:32 ` Akhil Goyal
2020-02-04 11:35 ` Bruce Richardson
2020-02-04 22:10 ` Neil Horman
2020-02-05 6:16 ` [dpdk-dev] [EXT] " Anoob Joseph
2020-02-05 14:33 ` Trahe, Fiona
2020-02-04 21:59 ` [dpdk-dev] " Neil Horman
2020-01-30 13:06 ` Trahe, Fiona
2020-01-30 15:59 ` Thomas Monjalon
2020-01-30 16:42 ` Ferruh Yigit [this message]
2020-01-30 23:49 ` Ananyev, Konstantin
2020-01-31 9:07 ` Ferruh Yigit
2020-01-31 9:37 ` Ananyev, Konstantin
2020-01-30 10:57 ` [dpdk-dev] [PATCH v2 0/4] " Luca Boccassi
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 " David Marchand
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 1/4] hash: fix meson headers packaging David Marchand
2020-01-30 18:01 ` Wang, Yipeng1
2020-01-30 18:40 ` Honnappa Nagarahalli
2020-02-05 19:51 ` Wang, Yipeng1
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 2/4] build: split build helper David Marchand
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 3/4] build: test meson installation David Marchand
2020-01-30 22:17 ` Thomas Monjalon
2020-01-30 16:00 ` [dpdk-dev] [PATCH v3 4/4] add ABI checks David Marchand
2020-01-30 22:32 ` Thomas Monjalon
2020-02-01 15:29 ` David Marchand
2020-01-30 22:44 ` Thomas Monjalon
2020-02-02 21:08 ` [dpdk-dev] [PATCH v4 0/3] " David Marchand
2020-02-02 21:08 ` [dpdk-dev] [PATCH v4 1/3] hash: fix meson headers packaging David Marchand
2020-02-05 19:53 ` Wang, Yipeng1
2020-02-02 21:08 ` [dpdk-dev] [PATCH v4 2/3] build: split build helper David Marchand
2020-02-02 21:08 ` [dpdk-dev] [PATCH v4 3/3] add ABI checks David Marchand
2020-02-05 14:13 ` [dpdk-dev] [PATCH v4 0/3] " Thomas Monjalon
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