From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 8021AA0525; Fri, 21 Feb 2020 11:26:04 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id DEE401BFAD; Fri, 21 Feb 2020 11:26:03 +0100 (CET) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 7F0E337B0 for ; Fri, 21 Feb 2020 11:26:02 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Feb 2020 02:26:01 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,467,1574150400"; d="scan'208";a="349359664" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.20]) ([10.237.221.20]) by fmsmga001.fm.intel.com with ESMTP; 21 Feb 2020 02:25:59 -0800 From: Ferruh Yigit To: Neil Horman , John McNamara , Marko Kovacevic Cc: dev@dpdk.org, Thomas Monjalon , Bruce Richardson , Akhil Goyal , Konstantin Ananyev , David Marchand , Jerin Jacob , Andrew Rybchenko , Ori Kam References: <20200130142003.2645765-1-ferruh.yigit@intel.com> Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] doc: deprecate using MAX values as array size X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 1/30/2020 2:20 PM, Ferruh Yigit wrote: > Adding the deprecation notice as reminder for next ABI breakage release > (20.11). > This one time breakage is required to be able to extend enum/define > without breaking ABI. > > Signed-off-by: Ferruh Yigit > --- > doc/guides/rel_notes/deprecation.rst | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst > index dfcca87ab..99d81564a 100644 > --- a/doc/guides/rel_notes/deprecation.rst > +++ b/doc/guides/rel_notes/deprecation.rst > @@ -38,6 +38,20 @@ Deprecation Notices > remove it from the externally visible ABI and allow it to be updated in the > future. > > +* lib: will fix extending some enum/define breaking the ABI. There are multiple > + samples in DPDK that enum/define terminated with a ``.*MAX.*`` value which is > + used by iterators, and arrays holding these values are sized with this > + ``.*MAX.*`` value. So extending this enum/define increases the ``.*MAX.*`` > + value which increases the size of the array and depending on how/where the > + array is used this may break the ABI. > + ``RTE_ETH_FLOW_MAX`` is one sample of the mentioned case, adding a new flow > + type will break the ABI because of ``flex_mask[RTE_ETH_FLOW_MAX]`` array > + usage in following public struct hierarchy: > + ``rte_eth_fdir_flex_conf -> rte_fdir_conf -> rte_eth_conf (in the middle)``. > + Need to identify this kind of usages and fix in 20.11, otherwise this blocks > + us extending existing enum/define. > + One solution can be using a fixed size array instead of ``.*MAX.*`` value. > + > * dpaa2: removal of ``rte_dpaa2_memsegs`` structure which has been replaced > by a pa-va search library. This structure was earlier being used for holding > memory segments used by dpaa2 driver for faster pa->va translation. This > Reminder of this deprecation notice.