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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Neil Horman <nhorman@tuxdriver.com>,
	John McNamara <john.mcnamara@intel.com>,
	Marko Kovacevic <marko.kovacevic@intel.com>,
	dev@dpdk.org, David Marchand <david.marchand@redhat.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	Andrew Rybchenko <arybchenko@solarflare.com>
Subject: Re: [dpdk-dev] [PATCH] doc: plan splitting the ethdev ops struct
Date: Fri, 21 Feb 2020 10:40:00 +0000
Message-ID: <e3754177-1d32-a2ef-3907-0d1789c56588@intel.com> (raw)
In-Reply-To: <20200217220106.25ceb64c@hermes.lan>

On 2/18/2020 6:01 AM, Stephen Hemminger wrote:
> On Mon, 17 Feb 2020 15:38:05 +0000
> Ferruh Yigit <ferruh.yigit@intel.com> 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 <ferruh.yigit@intel.com>
>> ---
>> Cc: David Marchand <david.marchand@redhat.com>
>> Cc: Thomas Monjalon <thomas@monjalon.net>
>> Cc: Andrew Rybchenko <arybchenko@solarflare.com>
>> ---
>>  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.
>

  reply	other threads:[~2020-02-21 10:40 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-17 15:38 Ferruh Yigit
2020-02-18  5:07 ` Jerin Jacob
2020-02-25 12:42   ` Ferruh Yigit
2020-05-26 13:01   ` Thomas Monjalon
2020-02-18  6:01 ` Stephen Hemminger
2020-02-21 10:40   ` Ferruh Yigit [this message]
2020-02-25 10:35     ` Andrew Rybchenko
2020-02-25 11:07       ` Ananyev, Konstantin
2020-02-25 11:19         ` Andrew Rybchenko
2020-02-25 12:28       ` Ferruh Yigit
2020-02-25 12:44 ` [dpdk-dev] [PATCH v2] " Ferruh Yigit
2020-02-25 15:51   ` Andrew Rybchenko
2020-02-25 16:13     ` Ferruh Yigit
2020-02-25 16:41       ` Andrew Rybchenko
2020-02-25 18:13   ` David Marchand
2020-02-25 18:18     ` Ferruh Yigit
2020-03-04  9:57   ` [dpdk-dev] [PATCH v3] " Ferruh Yigit
2020-05-24 23:18     ` Thomas Monjalon
2020-05-25  9:11       ` Andrew Rybchenko
2020-05-26 13:55         ` Thomas Monjalon
2020-05-25 10:24     ` David Marchand

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