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 6DF54A055A; Tue, 25 Feb 2020 17:41:56 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 516501BF8D; Tue, 25 Feb 2020 17:41:55 +0100 (CET) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id DBC552C4F for ; Tue, 25 Feb 2020 17:41:53 +0100 (CET) X-Virus-Scanned: Proofpoint Essentials engine Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mx1-us4.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 8B3FF140069; Tue, 25 Feb 2020 16:41:51 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 25 Feb 2020 16:41:44 +0000 To: Ferruh Yigit , Neil Horman , John McNamara , "Marko Kovacevic" CC: , Jerin Jacob , David Marchand , Thomas Monjalon References: <20200217153805.888130-1-ferruh.yigit@intel.com> <20200225124431.4088444-1-ferruh.yigit@intel.com> <3fa55af2-1a9b-d9b7-80a0-2a55a9b8468b@solarflare.com> <0a105584-532f-87cd-edf9-5dd1f35e2c2b@intel.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK 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4VPLn5aAcfbCXJnE3IGCp/hPl50iQqu7BPOYBbWXeb9ptDjGCAThNxSz0WAXkmcjAFE8gdE6 Znk9 Message-ID: Date: Tue, 25 Feb 2020 19:41:41 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <0a105584-532f-87cd-edf9-5dd1f35e2c2b@intel.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.17.10.39] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1020-25252.003 X-TM-AS-Result: No-10.564100-8.000000-10 X-TMASE-MatchedRID: 9d2LtCNB3NLmLzc6AOD8DfHkpkyUphL9M0wEwxpnA/7Lkl8e9W70i3jm 0APnwZU22dHEsrnI/tq4Rt1oNt5z9aH2g9syPs88boe6sMfg+k9kAa0IkTbdiJb9wfEWdZoY/pE 4pKve7n8tTEJALEmm0vL5cWtbde9AYlldA0POS1IUaS/iLVoC5rvGYJkNeu61abJxhiIFjJn6ql eT2/y7BSJH06iuJzm5/FbT2/LT1haiN61W1OfKwY6cpbnLdja9jxlxHm47Dzp+SLLtNOiBhophv cx5CjEQyjDvTlT/AHU7wxXRVz1snWm3SnkbLZr6R/j040fRFpJ0HPaew1kGCRqB+wKK9uZeN8y5 luO/M1TbUZ9/I+masnncy2+f1VaQDOC9GmR8egG0YzRwENQzjczzMs2dyeyVjr+PnGtGztObliZ PhZWFTqIHi4zmJGhmUVNLFjq30TcOgOZ69b/E+tB/IoRhBzVHQfblIp3oBdGbKItl61J/ycnjLT A/UDoAoTCA5Efyn8CNo+PRbWqfRDsAVzN+Ov/sv8a2Tquqw7AVJozhbvM+vwQCYwQA/+EKSm48W 19tqWJTffHEnKV05w== X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--10.564100-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25252.003 X-MDID: 1582648913-cHOQfCzTJ9M9 Subject: Re: [dpdk-dev] [PATCH v2] 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 2/25/20 7:13 PM, Ferruh Yigit wrote: > On 2/25/2020 3:51 PM, Andrew Rybchenko wrote: >> On 2/25/20 3:44 PM, 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 >>> Acked-by: Jerin Jacob >>> --- >>> Cc: David Marchand >>> Cc: Thomas Monjalon >>> Cc: Andrew Rybchenko >>> >>> v2: >>> * Add target date for the work >>> * Give more detail on what will be done >>> --- >>> doc/guides/rel_notes/deprecation.rst | 11 +++++++++++ >>> 1 file changed, 11 insertions(+) >>> >>> diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst >>> index 99d81564a..ff612a615 100644 >>> --- a/doc/guides/rel_notes/deprecation.rst >>> +++ b/doc/guides/rel_notes/deprecation.rst >>> @@ -86,6 +86,17 @@ 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. >>> + Initial split will be done in 20.05 with adding reserved fields for the struct >>> + used by inline functions, and by putting new struct reference into public one >>> + to not increase the size of ``struct rte_eth_dev``, proper split will be done >>> + in 20.11 by moving inline dev_ops function to next to Rx/Tx burst functions and >>> + hiding rest. >>> + >>> * 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 >> >> I'd like to understand why do we need an intermediate solution first. > > We don't need it really, we may prefer to postpone the update to 20.11. > >> Also rereading above few times I've failed to fully understand what >> will be done and why it does not break API/ABI. >> > > Agree it wasn't very clear, but I mean something like below, I hope it clarifies: > > Previously: > > struct rte_eth_dev > > +--------+ > | | *dev_ops struct eth_dev_ops > | | > | +-------------->+--------+ > | | | | > | | | | > | | | | > | | | | > +--------+ | | > | | > | | > | | > +--------+ > > > Proposed: > > struct rte_eth_dev > > +--------+ > | | struct eth_dev_ops > | | > |*dev_ops+-------------->+--------+ > | | | | > | | | Reserv | > | | | | > | | | | > +--------+ | | > +--------+ > | inline | > | de^_ops| struct eth_dev_ops > +--------+ > | *priv +------------->+--------+ > +--------+ | | > | | > | | > | | > | | > | | > | | > | | > +--------+ > > This is only to keep ABI compatibility [1] while separating the struct. > > [1] > - The offset of some functions in the dev_ops struct should be same > - The size of the "struct rte_eth_dev" should be same > OK, got it. Many thanks for explanations.