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From: David Marchand <david.marchand@redhat.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: dev <dev@dpdk.org>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	 Bruce Richardson <bruce.richardson@intel.com>,
	Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH v1 0/9] dpdk: introduce __rte_internal tag
Date: Thu, 13 Jun 2019 09:53:46 +0200
Message-ID: <CAJFAV8wioyE04g7PuaTbsz65Y7hEkMtSUhVkHhWM+y4SwCPBQQ@mail.gmail.com> (raw)
In-Reply-To: <20190612203903.16565-1-nhorman@tuxdriver.com>

On Wed, Jun 12, 2019 at 10:40 PM Neil Horman <nhorman@tuxdriver.com> wrote:

> Hey-
>         Based on our recent conversations regarding the use of symbols only
> meant for internal dpdk consumption (between dpdk libraries), this is an
> idea
> that I've come up with that I'd like to get some feedback on
>
> Summary:
> 1) We have symbols in the DPDK that are meant to be used between DPDK
> libraries,
> but not by applications linking to them
> 2) We would like to document those symbols in the code, so as to note them
> clearly as for being meant for internal use only
> 3) Linker symbol visibility is a very coarse grained tool, and so there is
> no
> good way in a single library to mark items as being meant for use only by
> other
> DPDK libraries, at least not without some extensive runtime checking
>
>
> Proposal:
> I'm proposing that we introduce the __rte_internal tag.  From a coding
> standpoint it works a great deal like the __rte_experimental tag in that it
> expempts the tagged symbol from ABI constraints (as the only users should
> be
> represented in the DPDK build environment).  Additionally, the
> __rte_internal
> macro resolves differently based on the definition of the BUILDING_RTE_SDK
> flag
> (working under the assumption that said flag should only ever be set if we
> are
> actually building DPDK libraries which will make use of internal calls).
> If the
> BUILDING_RTE_SDK flag is set __rte_internal resolves to
> __attribute__((section
> "text.internal)), placing it in a special text section which is then used
> to
> validate that the the symbol appears in the INTERNAL section of the
> corresponding library version map).  If BUILDING_RTE_SDK is not set, then
> __rte_internal resolves to __attribute__((error("..."))), which causes any
> caller of the tagged function to throw an error at compile time,
> indicating that
> the symbol is not available for external use.
>
> This isn't a perfect solution, as applications can still hack around it of
> course, but I think it hits some of the high points, restricting symbol
> access
> for any library that prototypes its public and private symbols in the same
> header file, excluding the internal symbols from ABI constraints, and
> clearly
> documenting those symbols which we wish to limit to internal usage.
>
> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> CC: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
> CC: Bruce Richardson <bruce.richardson@intel.com>
> CC: Thomas Monjalon <thomas@monjalon.net>
>
>
>
On the principle, are we not breaking the ABI for the libraries that we
touch with this?

Compilation is broken in patch 1 and 2 because the script rename is part of
patch 3.


-- 
David Marchand

  parent reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-25 18:43 [dpdk-dev] [RFC PATCH 0/2] " Neil Horman
2019-05-25 18:43 ` [dpdk-dev] [RFC PATCH 1/2] Add __rte_internal tag for functions and version target Neil Horman
2019-06-05 16:14   ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-05-25 18:43 ` [dpdk-dev] [RFC PATCH 2/2] Convert dpaa driver to tag internal-only symbols appropriately Neil Horman
2019-06-05 16:24 ` [dpdk-dev] [EXT] [RFC PATCH 0/2] introduce __rte_internal tag Jerin Jacob Kollanukkaran
2019-06-05 16:45   ` Bruce Richardson
2019-06-05 18:11     ` Neil Horman
2019-06-06  9:44       ` Jerin Jacob Kollanukkaran
2019-06-06 11:34         ` Neil Horman
2019-06-06 12:04           ` Jerin Jacob Kollanukkaran
2019-06-06 13:18             ` Wiles, Keith
2019-06-06 13:43               ` Neil Horman
2019-06-06 13:53                 ` Wiles, Keith
2019-06-06 14:46                   ` Neil Horman
2019-06-06 13:35             ` Neil Horman
2019-06-06 14:02               ` Jerin Jacob Kollanukkaran
2019-06-06 15:03                 ` Neil Horman
2019-06-06 15:14                   ` Jerin Jacob Kollanukkaran
2019-06-06 15:26                     ` Neil Horman
2019-06-06 16:23                       ` Jerin Jacob Kollanukkaran
2019-06-06 16:55                         ` Neil Horman
2019-06-07  9:41                           ` Jerin Jacob Kollanukkaran
2019-06-07 10:35                             ` Neil Horman
2019-06-07 15:42                   ` Ray Kinsella
2019-06-07 18:21                     ` Wiles, Keith
2019-06-12 20:38 ` [dpdk-dev] [PATCH v1 0/9] dpdk: " Neil Horman
2019-06-12 20:38   ` [dpdk-dev] [PATCH v1 1/9] Add __rte_internal tag for functions and version target Neil Horman
2019-06-12 20:38   ` [dpdk-dev] [PATCH v1 2/9] Exempt INTERNAL symbols from checking Neil Horman
2019-06-12 20:38   ` [dpdk-dev] [PATCH v1 3/9] mark dpaa driver internal-only symbols with __rte_internal Neil Horman
2019-06-12 20:38   ` [dpdk-dev] [PATCH v1 4/9] fslmc: identify internal only functions and tag them as __rte_internal Neil Horman
2019-06-12 20:38   ` [dpdk-dev] [PATCH v1 5/9] dpaa2: Adjust dpaa2 driver to mark internal symbols with __rte_internal Neil Horman
2019-06-12 20:39   ` [dpdk-dev] [PATCH v1 6/9] dpaax: mark internal functions " Neil Horman
2019-06-12 20:39   ` [dpdk-dev] [PATCH v1 7/9] cpt: " Neil Horman
2019-06-17  5:27     ` [dpdk-dev] [EXT] " Anoob Joseph
2019-06-12 20:39   ` [dpdk-dev] [PATCH v1 8/9] octeonx: " Neil Horman
2019-06-12 20:39   ` [dpdk-dev] [PATCH v1 9/9] dpaa2: " Neil Horman
2019-06-12 21:14     ` Aaron Conole
2019-06-13 10:24       ` Neil Horman
2019-06-13  7:53   ` David Marchand [this message]
2019-06-13 10:30     ` [dpdk-dev] [PATCH v1 0/9] dpdk: introduce __rte_internal tag Neil Horman
2019-06-13 14:23 ` [dpdk-dev] [PATCH v2 0/10] " Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 01/10] Add __rte_internal tag for functions and version target Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 02/10] meson: add BUILDING_RTE_SDK Neil Horman
2019-06-13 14:44     ` Bruce Richardson
2019-06-19 10:39       ` Neil Horman
2019-06-19 10:46         ` Bruce Richardson
2019-06-19 18:34           ` Neil Horman
2019-06-20 10:20             ` Bruce Richardson
2019-06-20 10:21     ` Bruce Richardson
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 03/10] Exempt INTERNAL symbols from checking Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 04/10] mark dpaa driver internal-only symbols with __rte_internal Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 05/10] fslmc: identify internal only functions and tag them as __rte_internal Neil Horman
2019-06-17  7:30     ` Hemant Agrawal
2019-06-19 10:45       ` Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 06/10] dpaa2: Adjust dpaa2 driver to mark internal symbols with __rte_internal Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 07/10] dpaax: mark internal functions " Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 08/10] cpt: " Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 09/10] octeonx: " Neil Horman
2019-06-13 14:23   ` [dpdk-dev] [PATCH v2 10/10] dpaa2: " Neil Horman
2019-08-06 10:03   ` [dpdk-dev] [PATCH v2 0/10] dpdk: introduce __rte_internal tag Thomas Monjalon
2019-08-06 12:21     ` Neil Horman

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