> -----Original Message-----
> From: Neil Horman <nhor...@tuxdriver.com>
> Sent: Sunday, May 26, 2019 12:14 AM
> To: dev@dpdk.org
> Cc: Neil Horman <nhor...@tuxdriver.com>; Jerin Jacob Kollanukkaran
> <jer...@marvell.com>; Bruce Richardson <bruce.richard...@intel.com>;
> Thomas Monjalon <tho...@monjalon.net>
> Subject: [EXT] [RFC PATCH 1/2] Add __rte_internal tag for functions and
> version target
> This tag is meant to be used on function prototypes to identify functions that
> are only meant to be used by internal DPDK libraries (i.e. libraries that are
> built while building the SDK itself, as identified by the defining of the
> BUILDING_RTE_SDK macro). When that flag is not set, it will resolve to an
> error function attribute, causing build breakage for any compilation unit
> attempting to build it
>
> Validate the use of this tag in much the same way we validate
> __rte_experimental. By adding an INTERNAL version to library map files, we
> can exempt internal-only functions from ABI checking, and handle them to
> ensure that symbols we wish to only be for internal use between dpdk
> libraries are properly tagged with __rte_experimental
>
> Note this patch updates the check-experimental-syms.sh script, which
> normally only check the EXPERIMENTAL section to also check the INTERNAL
> section now. As such its been renamed to the now more appropriate check-
> special-syms.sh
>
> Signed-off-by: Neil Horman <nhor...@tuxdriver.com>
> CC: Jerin Jacob Kollanukkaran <jer...@marvell.com>
> CC: Bruce Richardson <bruce.richard...@intel.com>
> CC: Thomas Monjalon <tho...@monjalon.net>
> ---
> buildtools/check-experimental-syms.sh | 24 +++++++++++++++++++++-
> lib/librte_eal/common/include/rte_compat.h | 12 +++++++++++
> mk/internal/rte.compile-pre.mk | 6 +++---
> mk/target/generic/rte.vars.mk | 2 +-
> 4 files changed, 39 insertions(+), 5 deletions(-)
>
> diff --git a/buildtools/check-experimental-syms.sh b/buildtools/check-
> experimental-syms.sh
> index 7d1f3a568..63682c677 100755
> --- a/buildtools/check-experimental-syms.sh
> +++ b/buildtools/check-experimental-syms.sh
> @@ -31,10 +31,32 @@ do
> cat >&2 <<- END_OF_MESSAGE
> $SYM is not flagged as experimental
> but is listed in version map
> - Please add __rte_experimental to the definition of $SYM
> + Please add __rte_experimental to the definition/prototype
> of $SYM
> END_OF_MESSAGE
> exit 1
> fi
> done
> +
> +for i in `awk 'BEGIN {found=0}
> + /.*INTERNAL.*/ {found=1}
> + /.*}.*;/ {found=0}
> + /.*;/ {if (found == 1) print $1}' $MAPFILE` do
> + SYM=`echo $i | sed -e"s/;//"`
> + objdump -t $OBJFILE | grep -q "\.text.*$SYM$"
> + IN_TEXT=$?
> + objdump -t $OBJFILE | grep -q "\.text\.internal.*$SYM$"
I think, it should be OK for cross compilation case. But please cross check.
> + IN_EXP=$?
> + if [ $IN_TEXT -eq 0 -a $IN_EXP -ne 0 ]
> + then
> + cat >&2 <<- END_OF_MESSAGE
> + $SYM is not flagged as internal
> + but is listed in version map
> + Please add __rte_internal to the definition/prototype of
> $SYM
> + END_OF_MESSAGE
> + exit 1
> + fi
> +done
> +
> exit 0
>
> diff --git a/lib/librte_eal/common/include/rte_compat.h
> b/lib/librte_eal/common/include/rte_compat.h
> index 92ff28faf..739e8485c 100644
> --- a/lib/librte_eal/common/include/rte_compat.h
> +++ b/lib/librte_eal/common/include/rte_compat.h
It is a public header file, How about, having __rte_internal
In internal header file so that only SDK components can use it.
> @@ -89,4 +89,16 @@ __attribute__((section(".text.experimental")))
>
> #endif
>
> +/*
> + * __rte_internal tags mark functions as internal only, If specified in
> +public
> + * header files, this tag will resolve to an error directive,
> +preventing
> + * external applications from attempting to make calls to functions not
> +meant
> + * for consumption outside the dpdk library */ #ifdef BUILDING_RTE_SDK
> +#define __rte_internal __attribute__((section(".text.internal")))
Sometimes, we may have global variables like variable for dynamic logging etc.
If so, I think, it is better to change something not starting with .text
> +#else
> +#define __rte_internal __attribute__((error("This function cannot be used
> outside of the core DPDK library"), \
> + section(".text.internal")))
Since the above statement is an error, Do we need section attribute here?
