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Feb 2020 10:35:48 +0000 To: Ferruh Yigit , Stephen Hemminger CC: Neil Horman , John McNamara , Marko Kovacevic , , David Marchand , Thomas Monjalon References: <20200217153805.888130-1-ferruh.yigit@intel.com> <20200217220106.25ceb64c@hermes.lan> 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 of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 ITSxgNFCTbeJ03zL2MR5s0IvD9ghISAwZ6ieCjU5UATn5+63qpD0nVNLsAdb/UpfvQcKAmvj 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Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: 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-12.641900-8.000000-10 X-TMASE-MatchedRID: xcONGPdDH5rmLzc6AOD8DfHkpkyUphL9SeIjeghh/zNG7aLtT3oj+37Q lObBgGr+Vx/fMeJDT17Ww50fciS5uFGQ1BQ28jzPuwdUMMznEA8LKPaBHScRdQdkFovAReUoilv Ab18i4hNZ2qqIK4ET2tyO08Nryc0ce64yLR8Gq4Vv+/LIBBauP86gBdMBUo41a73+XlYDLuxEj0 5Lr8n8q7VMAcQtoG7b0oDwQAC6PYx6D6/hbj+qRaMY62qeQBkLPSgberZ8hXJKDy5+nmfdPnjBa ILWVRlCH5qqPEwRjJ0Yr73zT4AXdW8BU9XGR8QhGUlF/M3Dxp/348e2CE/wYsl8NQ3m2sq+3aET ZqC6VQRJQWCVvlJi8y0h6vwwLmsr3huBcHFqgEuKYdYQLbymTYyFtOxfKxTf4nhkC0SGkyRhBdu 2lLoBU6GvCFqoKSwTkZOl7WKIImrvXOvQVlExsFZ0V5tYhzdWxEHRux+uk8h+ICquNi0WJGEzw8 N5eZL9JKZMorNtgIYIQaRcY1RW1tpB1xtowQ63ftwZ3X11IV0= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--12.641900-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25252.003 X-MDID: 1582626957-NNb57G2rXNv9 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 2/21/20 1:40 PM, Ferruh Yigit wrote: > 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 think having 3 places (if I understand the intention correctly) with ethdev callbacks is too much. So, I think that these ops should be simply moved to nearby Tx/Rx burst and Tx prepare callbacks (e.g. move into inline_ops structure which is located at the beginning of rte_eth_dev in order to preserve 3 existing callback location). Also I'd consider to deprecate and remove rx_queue_count and rx_descriptor_done. >> >> 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. >>