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 B78F3A0525; Fri, 21 Feb 2020 11:40:06 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 69FA21BF9C; Fri, 21 Feb 2020 11:40:05 +0100 (CET) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by dpdk.org (Postfix) with ESMTP id 12B534C81 for ; Fri, 21 Feb 2020 11:40:03 +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 orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Feb 2020 02:40:02 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,467,1574150400"; d="scan'208";a="349361757" 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 02:40:00 -0800 To: Stephen Hemminger Cc: Neil Horman , John McNamara , Marko Kovacevic , dev@dpdk.org, David Marchand , Thomas Monjalon , Andrew Rybchenko References: <20200217153805.888130-1-ferruh.yigit@intel.com> <20200217220106.25ceb64c@hermes.lan> From: Ferruh Yigit 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: plan splitting the ethdev ops struct 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 2/18/2020 6:01 AM, Stephen Hemminger wrote: > On Mon, 17 Feb 2020 15:38:05 +0000 > Ferruh Yigit wrote: > >> For the ABI compatibility it is better to hide internal data structures >> from the application as much as possible. But because of some inline >> functions 'struct eth_dev_ops' can't be hidden completely. >> >> Plan is to split the 'struct eth_dev_ops' into two as ones used by >> inline functions and ones not used, and hide the second part that not >> used by inline functions completely to the application. >> >> Signed-off-by: Ferruh Yigit >> --- >> Cc: David Marchand >> Cc: Thomas Monjalon >> Cc: Andrew Rybchenko >> --- >> doc/guides/rel_notes/deprecation.rst | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst >> index dfcca87ab..2aa431028 100644 >> --- a/doc/guides/rel_notes/deprecation.rst >> +++ b/doc/guides/rel_notes/deprecation.rst >> @@ -72,6 +72,12 @@ Deprecation Notices >> In 19.11 PMDs will still update the field even when the offload is not >> enabled. >> >> +* ethdev: Split the ``struct eth_dev_ops`` struct to hide it as much as possible. >> + Currently the ``struct eth_dev_ops`` struct is accessible by the application >> + because some inline functions, like ``rte_eth_tx_descriptor_status()``, >> + access the struct directly. The struct will be separate in two, the ops used >> + by inline functions still will be accessible to user but rest will be hidden. >> + >> * cryptodev: support for using IV with all sizes is added, J0 still can >> be used but only when IV length in following structs ``rte_crypto_auth_xform``, >> ``rte_crypto_aead_xform`` is set to zero. When IV length is greater or equal > > Good luck, truely hiding internals is hard. The mbuf structure is already split but not really > hidden at all (just look at dwarf output). It doesn't make sense to do it unless > you can really hide it. I believe this can be done, only following [1] dev_ops are used by inline functions, rest can be moved into separate struct and moved into ethdev driver looking header. [1] rx_queue_count rx_descriptor_done rx_descriptor_status tx_descriptor_status > > I would attack the rte_device stuff first. Make rte_device opaque to the application > that would help for future versions. Then work backwards to rte_tehtdev. >