Re: [dpdk-dev] [PATCH] devtools: skip the symbol check when map file under drivers

[Neil Horman <nhorman@tuxdriver.com>]

On Wed, May 22, 2019 at 01:26:28AM +0530, jerinj@marvell.com wrote:
> From: Jerin Jacob <jerinj@marvell.com>
> 
> Drivers do not have ABI.
> Skip the symbol check if map file under drivers directory.
> 
> Fixes: 4bec48184e33 ("devtools: add checks for ABI symbol addition")
> 
> Cc: stable@dpdk.org
> Cc: Neil Horman <nhorman@tuxdriver.com>
> 
Sorry, but I'm not ok with this, because many of our DPDK PMDs have functions
that get exported which are meant to be called by applications directly.  The
dpaa2 driver is a good example, the cryptodev scheduler is another.  Take a look
at their version.map files to see what I mean.

Unless we are willing to make drivers opaque objects that are only accessible
from the [eth|crypto|etc]dev apis in the DPDK core, we have the potential for
exported symbols, which means we have an ABI that has to be maintained, or at
least recognized and reviewed for consistency

Nacked-by: Neil Horman <nhorman@tuxdriver.com>


> Signed-off-by: Jerin Jacob <jerinj@marvell.com>
> ---
>  devtools/check-symbol-change.sh | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/devtools/check-symbol-change.sh b/devtools/check-symbol-change.sh
> index c5434f3bb..444beddad 100755
> --- a/devtools/check-symbol-change.sh
> +++ b/devtools/check-symbol-change.sh
> @@ -93,6 +93,14 @@ check_for_rule_violations()
>  		if [ "$ar" = "add" ]
>  		then
>  
> +			directory=`echo $mname | cut -d / -f 2`
> +			if [ "$directory" = "drivers" ]
> +			then
> +				# Drivers do not have ABI. Skip further
> +				# processing if the map file is under
> +				# drivers directory
> +				continue
> +			fi
>  			if [ "$secname" = "unknown" ]
>  			then
>  				# Just inform the user of this occurrence, but
> -- 
> 2.21.0
> 
>