patches for DPDK stable branches
 help / color / mirror / Atom feed
From: Ray Kinsella <mdr@ashroe.eu>
To: "Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>
Cc: Neil Horman <nhorman@tuxdriver.com>,
	Eelco Chaudron <echaudro@redhat.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	David Marchand <david.marchand@redhat.com>,
	"stable@dpdk.org" <stable@dpdk.org>,
	Luca Boccassi <bluca@debian.org>,
	"Richardson, Bruce" <bruce.richardson@intel.com>,
	"Stokes, Ian" <ian.stokes@intel.com>,
	Andrzej Ostruszka <amo@semihalf.com>
Subject: Re: [dpdk-stable] [PATCH v4] meter: provide experimental alias of API for old apps
Date: Mon, 18 May 2020 12:49:58 +0100
Message-ID: <e721d911-de70-3ae1-5349-b7b1672531c3@ashroe.eu> (raw)
In-Reply-To: <BYAPR11MB2935DB7BF37AA19A79FCBAADEBB80@BYAPR11MB2935.namprd11.prod.outlook.com>



On 18/05/2020 12:18, Dumitrescu, Cristian wrote:
> 
> 
>> -----Original Message-----
>> From: Thomas Monjalon <thomas@monjalon.net>
>> Sent: Monday, May 18, 2020 11:46 AM
>> To: Yigit, Ferruh <ferruh.yigit@intel.com>; Ray Kinsella <mdr@ashroe.eu>;
>> Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
>> Cc: Neil Horman <nhorman@tuxdriver.com>; Eelco Chaudron
>> <echaudro@redhat.com>; dev@dpdk.org; David Marchand
>> <david.marchand@redhat.com>; stable@dpdk.org; Luca Boccassi
>> <bluca@debian.org>; Richardson, Bruce <bruce.richardson@intel.com>;
>> Stokes, Ian <ian.stokes@intel.com>; Andrzej Ostruszka
>> <amo@semihalf.com>
>> Subject: Re: [PATCH v4] meter: provide experimental alias of API for old apps
>>
>> 18/05/2020 11:30, Ray Kinsella:
>>> On 18/05/2020 10:22, Thomas Monjalon wrote:
>>>> 18/05/2020 08:29, Ray Kinsella:
>>>>> On 17/05/2020 20:52, Dumitrescu, Cristian wrote:
>>>>>> From: Yigit, Ferruh <ferruh.yigit@intel.com>
>>>>>>>
>>>>>>> On v20.02 some meter APIs have been matured and symbols moved
>> from
>>>>>>> EXPERIMENTAL to DPDK_20.0.1 block.
>>>>>>>
>>>>>>> This can break the applications that were using these mentioned APIs
>> on
>>>>>>> v19.11. Although there is no modification on the APIs and the action is
>>>>>>> positive and matures the APIs, the affect can be negative to
>>>>>>> applications.
>>>>>>>
>>>>>>> Since experimental APIs can change or go away without notice as part
>> of
>>>>>>> contract, to prevent this negative affect that may occur by maturing
>>>>>>> experimental API, a process update already suggested, which
>> enables
>>>>>>> aliasing without forcing it:
>>>>>>> https://patches.dpdk.org/patch/65863/
>>>>>>>
>>>>>>
>>>>>> Personally, I am not convinced this is really needed.
>>>>>>
>>>>>> Are there any users asking for this?
>>>>>
>>>>> As it happens it is all breaking our abi regression test suite.
>>>>> One of the things we do is to run the unit tests binary from v19.11
>> against the latest release.
>>>>>
>>>>>> Is there any other library where this is also applied, or is librte_meter
>> the only library?
>>>>>
>>>>> librte_meter is the only example AFAIK.
>>>>> But then we only have one example of needing symbol versioning also
>> at the moment (Cryptodev).
>>>>>
>>>>> This is going to happen with experimental symbols that have been
>> around a while,
>>>>> that have become used in applications. It is a non-mandatory tool a
>> maintainer can use
>>>>> to preserve abi compatibility.
>>>>
>>>> If you want to maintain ABI compatibility of experimental symbols,
>>>> it IS a mandatory tool.
>>>> You cannot enforce your "ABI regression test suite" and at the same time
>>>> say it is "non-mandatory".
>>>>
>>>> The real question here is to know whether we want to maintain
>> compatibility
>>>> of experimental symbols. We said no. Then we said we can.
>>>> The main concern is the message clarity in my opinion.
>>>>
>>>
>>> There is complete clarity, there is no obligation.
>>> Our lack of obligation around experimental, is upfront in the policy is
>> upfront in the policy.
>>>
>>> "Libraries or APIs marked as experimental may change without constraint,
>> as they are not considered part of an ABI version. Experimental libraries have
>> the major ABI version 0."
>>>
>>> Later we give the _option_ without obligation to add an alias to
>> experimental.pls see the v6.
>>>
>>> +   - In situations in which an ``experimental`` symbol has been stable for
>> some
>>> +     time. When promoting the symbol to become part of the next ABI
>> version, the
>>> +     maintainer may choose to provide an alias to the ``experimental`` tag,
>> so
>>> +     as not to break consuming applications.
>>>
>>> So it is something a Maintainer, _may_ choose to do.
>>> I use the word, "may" not "will" as there is no obligation's associated with
>> experimental.
>>
>>
>> OK Ray, this is my understanding as well.
>>
>> The only difficult part to understand is when claiming
>> "it is all breaking our abi regression test suite"
>> to justify the choice.
>> As the maintainer (Cristian) says he does not like this change,
>> it means the regression test suite should skip this case, right?
>>
> 
> I am yet to be convinced of the value of this, but if some people think it is useful, I am willing to compromise. This is subject to this code being temporary code to be removed for 20.11 release, which Ray already confirmed.
> 
> Ray, a few more suggestions, are you OK with them?
> 1. Move this code to a separate file in the library (suggest rte_meter_abi_compat.c as the file name)
> 2. Clearly state in the patch description this is temporary code to be removed for 20.11 release.
> 3. Agree that you or Ferruh take the AR to send a patch prior to the 20.11 release to remove this code.
> 
> Thanks,
> Cristian

Hi Cristain - I am good with all of the above.

Ray K


  reply	other threads:[~2020-05-18 11:50 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200513121149.2283385-1-ferruh.yigit@intel.com>
2020-05-13 18:05 ` [dpdk-stable] [PATCH v2] " Ferruh Yigit
2020-05-14  8:44   ` Ray Kinsella
2020-05-14 11:53     ` Ferruh Yigit
2020-05-14 11:52 ` [dpdk-stable] [PATCH v3] " Ferruh Yigit
2020-05-14 15:10   ` Ray Kinsella
2020-05-14 15:32   ` David Marchand
2020-05-14 15:56     ` Ray Kinsella
2020-05-14 16:07     ` Ferruh Yigit
2020-05-14 16:30       ` David Marchand
2020-05-14 16:11 ` [dpdk-stable] [PATCH v4] " Ferruh Yigit
2020-05-15 13:31   ` Thomas Monjalon
2020-05-15 14:41     ` Ray Kinsella
2020-05-15 15:03     ` Ray Kinsella
2020-05-15 14:36   ` [dpdk-stable] [dpdk-dev] " Ray Kinsella
2020-05-15 15:01   ` Ray Kinsella
2020-05-17 19:52   ` [dpdk-stable] " Dumitrescu, Cristian
2020-05-18  6:29     ` Ray Kinsella
2020-05-18  9:22       ` Thomas Monjalon
2020-05-18  9:30         ` Ray Kinsella
2020-05-18 10:46           ` Thomas Monjalon
2020-05-18 11:18             ` Dumitrescu, Cristian
2020-05-18 11:49               ` Ray Kinsella [this message]
2020-05-18 11:48             ` Ray Kinsella
2020-05-18 12:13               ` Thomas Monjalon
2020-05-18 13:06                 ` Ray Kinsella
2020-05-18 18:30 ` [dpdk-stable] [PATCH v5] " Ferruh Yigit
2020-05-19 12:16 ` [dpdk-stable] [PATCH v6] " Ferruh Yigit
2020-05-19 13:26   ` Dumitrescu, Cristian
2020-05-19 14:24     ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2020-05-19 14:22   ` [dpdk-stable] " Ray Kinsella

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=e721d911-de70-3ae1-5349-b7b1672531c3@ashroe.eu \
    --to=mdr@ashroe.eu \
    --cc=amo@semihalf.com \
    --cc=bluca@debian.org \
    --cc=bruce.richardson@intel.com \
    --cc=cristian.dumitrescu@intel.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=echaudro@redhat.com \
    --cc=ferruh.yigit@intel.com \
    --cc=ian.stokes@intel.com \
    --cc=nhorman@tuxdriver.com \
    --cc=stable@dpdk.org \
    --cc=thomas@monjalon.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

patches for DPDK stable branches

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ https://inbox.dpdk.org/stable \
		stable@dpdk.org
	public-inbox-index stable

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.stable


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git