From: Neil Horman <nhorman@tuxdriver.com>
To: "Wiles, Keith" <keith.wiles@intel.com>
Cc: DPDK <dev@dpdk.org>, Thomas Monjalon <thomas@monjalon.net>,
"Mcnamara, John" <john.mcnamara@intel.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>
Subject: Re: [dpdk-dev] [PATCHv3 0/4] dpdk: enhance EXPERIMENTAL api tagging
Date: Tue, 12 Dec 2017 15:14:26 -0500 [thread overview]
Message-ID: <20171212201426.GB1047@hmswarspite.think-freely.org> (raw)
In-Reply-To: <6890CBC3-B3E0-4127-B780-FAC5B5267292@intel.com>
On Tue, Dec 12, 2017 at 03:11:33PM +0000, Wiles, Keith wrote:
>
>
> > On Dec 11, 2017, at 1:36 PM, Neil Horman <nhorman@tuxdriver.com> wrote:
> >
> > Hey all-
> > A few days ago, I was lamenting the fact that, when reviewing patches I
> > would frequently complain about ABI changes that were actually considered safe
> > because they were part of the EXPERIMENTAL api set. John M. asked me then what
> > I might do to improve the situation, and the following patch set is a proposal
> > that I've come up with.
> >
> > In thinking about the problem I identified two issues that I think we
> > can improve on in this area:
>
> One question is how does this effect the ABI map files or does it? If an API is exposed in the map file does it need any type of special indicator on that API line? It may not make much difference, but I was thinking it could be an indicator the API is experimental and may not exist. If the new experimental API is included in the map file then it could become a problem for systems expecting all of the APIs in the map file to be solid.
>
> Regards,
> Keith
>
>
So, thats a few questions that are all interconnected, I'll try to answer them
as completely as I can:
1) Despite being experimental API's, they still need to be part of the version
map files. This is an always condition, and there are no ecpetions to that.
Failure to put an api call in the map file means it won't get exported when we
build as a shared library and so is unusable. This has been the case since we
introduced the map files. You'll note that each map file which exports
experimental APIS has an EXPERIMENTAL clause in the map for expressly this
purpose
2) One of the problems that I identified in my cover letter was that, when
reviewing patches (and when using API's), there was no clear indicator that the
patch we were reviewing was part of an experimental API (without
simeoultaneously consulting the map file). That was part of what this patch set
was meant to address (visual clues in the patch that told reviewers this was
part of an experimental API).
3) The __experimental tag is expressly meant to go on function definitions and
forward declarations to address the concern in (2) expressly
4) The __experimental tag is also meant to trigger a warning to users that build
code using experimental apis. At compile time a warning is generated for any
call made to said tagged api (unless -DALLOW_EXPERIMENTAL_APIS is set)
5) The one issue I had with this patch set was that there was a need to manually
keep in sync items tagged with __experimental and the symbols listed in the
EXPERIMENTAL section of a map file. The first patch in this series addresses
that by adding a build check to make sure that symbols in the map file are
tagged with __experimental in the source.
Hope that answers all your questions
Neil
next prev parent reply other threads:[~2017-12-12 20:15 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 18:56 [dpdk-dev] [PATCH " Neil Horman
2017-12-01 18:56 ` [dpdk-dev] [PATCH 1/4] buildtools: Add tool to check EXPERIMENTAL api exports Neil Horman
2017-12-01 18:56 ` [dpdk-dev] [PATCH 2/4] compat: Add __experimental macro Neil Horman
2017-12-01 18:56 ` [dpdk-dev] [PATCH 3/4] dpdk: add __experimental tag to appropriate api calls Neil Horman
2017-12-01 18:56 ` [dpdk-dev] [PATCH 4/4] Makefiles: Add experimental tag check and warnings to trigger on use Neil Horman
2017-12-08 17:14 ` [dpdk-dev] [PATCHv2 0/4] dpdk: enhance EXPERIMENTAL api tagging Neil Horman
2017-12-08 17:14 ` [dpdk-dev] [PATCHv2 1/4] buildtools: Add tool to check EXPERIMENTAL api exports Neil Horman
2017-12-08 17:14 ` [dpdk-dev] [PATCHv2 2/4] compat: Add __experimental macro Neil Horman
2017-12-08 17:14 ` [dpdk-dev] [PATCHv2 3/4] Makefiles: Add experimental tag check and warnings to trigger on use Neil Horman
2017-12-11 11:35 ` Bruce Richardson
2017-12-11 12:40 ` Neil Horman
2017-12-11 12:45 ` Bruce Richardson
2017-12-11 18:44 ` Neil Horman
2017-12-08 17:14 ` [dpdk-dev] [PATCHv2 4/4] dpdk: add __experimental tag to appropriate api calls Neil Horman
2017-12-11 19:36 ` [dpdk-dev] [PATCHv3 0/4] dpdk: enhance EXPERIMENTAL api tagging Neil Horman
2017-12-11 19:36 ` [dpdk-dev] [PATCHv3 1/4] buildtools: Add tool to check EXPERIMENTAL api exports Neil Horman
2017-12-11 19:36 ` [dpdk-dev] [PATCHv3 2/4] compat: Add __experimental macro Neil Horman
2017-12-11 19:36 ` [dpdk-dev] [PATCHv3 3/4] Makefiles: Add experimental tag check and warnings to trigger on use Neil Horman
2017-12-11 19:36 ` [dpdk-dev] [PATCHv3 4/4] dpdk: add __experimental tag to appropriate api calls Neil Horman
2017-12-12 14:07 ` [dpdk-dev] [PATCHv3 0/4] dpdk: enhance EXPERIMENTAL api tagging Bruce Richardson
2017-12-30 17:15 ` Neil Horman
2018-01-04 12:56 ` Neil Horman
2018-01-05 14:08 ` Thomas Monjalon
2018-01-05 16:00 ` Neil Horman
2018-01-09 1:32 ` [dpdk-dev] [dpdk-ci] " Neil Horman
2018-01-09 9:20 ` Thomas Monjalon
2018-01-09 12:36 ` Neil Horman
2018-01-19 15:44 ` Neil Horman
2017-12-12 14:33 ` [dpdk-dev] " Mcnamara, John
2017-12-12 20:18 ` Neil Horman
2017-12-12 15:11 ` Wiles, Keith
2017-12-12 20:14 ` Neil Horman [this message]
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 " Neil Horman
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 1/5] buildtools: Add tool to check EXPERIMENTAL api exports Neil Horman
2018-01-21 18:31 ` Thomas Monjalon
2018-01-21 22:07 ` Neil Horman
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 2/5] compat: Add __experimental macro Neil Horman
2018-01-21 18:37 ` Thomas Monjalon
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 3/5] Makefiles: Add experimental tag check and warnings to trigger on use Neil Horman
2018-01-11 20:06 ` Ferruh Yigit
2018-01-11 20:50 ` Neil Horman
2018-01-12 11:49 ` Ferruh Yigit
2018-01-12 12:44 ` Neil Horman
2018-01-21 18:54 ` Thomas Monjalon
2018-01-22 1:34 ` Neil Horman
2018-01-22 1:37 ` Thomas Monjalon
2018-01-21 18:50 ` Thomas Monjalon
2018-01-22 1:19 ` Neil Horman
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 4/5] dpdk: add __experimental tag to appropriate api calls Neil Horman
2018-01-11 20:06 ` Ferruh Yigit
2018-01-11 21:24 ` Neil Horman
2018-01-12 11:50 ` Ferruh Yigit
2018-01-12 14:25 ` Neil Horman
2018-01-12 15:53 ` Ferruh Yigit
2017-12-13 15:17 ` [dpdk-dev] [PATCHv4 5/5] doc: Add ABI __experimental tag documentation Neil Horman
2017-12-13 15:32 ` Bruce Richardson
2018-01-11 20:06 ` Ferruh Yigit
2018-01-11 21:29 ` Neil Horman
2018-01-12 11:50 ` Ferruh Yigit
2018-01-12 14:37 ` Neil Horman
2018-01-12 15:55 ` Ferruh Yigit
2018-01-13 0:28 ` Neil Horman
2018-01-13 15:56 ` Thomas Monjalon
2018-01-14 14:36 ` Neil Horman
2018-01-14 16:27 ` Thomas Monjalon
2018-01-21 20:14 ` Thomas Monjalon
2017-12-13 15:32 ` [dpdk-dev] [PATCHv4 0/4] dpdk: enhance EXPERIMENTAL api tagging Bruce Richardson
2017-12-21 14:21 ` Neil Horman
2017-12-30 19:20 ` Luca Boccassi
2017-12-31 1:57 ` Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [PATCH 0/5] " Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [[PATCH v5] 1/5] buildtools: Add tool to check EXPERIMENTAL api exports Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [[PATCH v5] 2/5] compat: Add __rte_experimental macro Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [[PATCH v5] 3/5] Makefiles: Add experimental tag check and warnings to trigger on use Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [[PATCH v5] 4/5] dpdk: add __rte_experimental tag to appropriate api calls Neil Horman
2018-01-22 1:48 ` [dpdk-dev] [[PATCH v5] 5/5] doc: Add ABI __experimental tag documentation Neil Horman
2018-01-23 10:35 ` Mcnamara, John
2018-01-29 21:42 ` Thomas Monjalon
2018-01-29 21:46 ` [dpdk-dev] [PATCH 0/5] dpdk: enhance EXPERIMENTAL api tagging Thomas Monjalon
2018-01-30 15:54 ` Neil Horman
2018-01-30 16:15 ` Thomas Monjalon
2018-01-31 12:18 ` Neil Horman
2018-01-31 12:36 ` Thomas Monjalon
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=20171212201426.GB1047@hmswarspite.think-freely.org \
--to=nhorman@tuxdriver.com \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=john.mcnamara@intel.com \
--cc=keith.wiles@intel.com \
--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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).