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From: Jerin Jacob <jerinjacobk@gmail.com>
To: "Kinsella, Ray" <mdr@ashroe.eu>
Cc: Tim McDaniel <timothy.mcdaniel@intel.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Jerin Jacob <jerinj@marvell.com>,
	Mattias Rönnblom <mattias.ronnblom@ericsson.com>,
	 dpdk-dev <dev@dpdk.org>, Gage Eads <gage.eads@intel.com>,
	 "Van Haaren, Harry" <harry.van.haaren@intel.com>
Subject: Re: [dpdk-dev] [PATCH 01/27] eventdev: dlb upstream prerequisites
Date: Tue, 30 Jun 2020 17:44:48 +0530
Message-ID: <CALBAE1Mz1=cyjkZOVS4H6e9h7-SFSbFdw1k3sCV=uBA_ZrAKCA@mail.gmail.com> (raw)
In-Reply-To: <c4a84f7a-9c40-c3f2-6b0e-9ca3066524ab@ashroe.eu>

On Tue, Jun 30, 2020 at 5:06 PM Kinsella, Ray <mdr@ashroe.eu> wrote:
>
>
>
> On 30/06/2020 12:30, Jerin Jacob wrote:
> > On Tue, Jun 30, 2020 at 4:52 PM Kinsella, Ray <mdr@ashroe.eu> wrote:
> >>
> >>
> >>
> >> On 27/06/2020 08:44, Jerin Jacob wrote:
> >>>> +
> >>>> +/** Event port configuration structure */
> >>>> +struct rte_event_port_conf_v20 {
> >>>> +       int32_t new_event_threshold;
> >>>> +       /**< A backpressure threshold for new event enqueues on this port.
> >>>> +        * Use for *closed system* event dev where event capacity is limited,
> >>>> +        * and cannot exceed the capacity of the event dev.
> >>>> +        * Configuring ports with different thresholds can make higher priority
> >>>> +        * traffic less likely to  be backpressured.
> >>>> +        * For example, a port used to inject NIC Rx packets into the event dev
> >>>> +        * can have a lower threshold so as not to overwhelm the device,
> >>>> +        * while ports used for worker pools can have a higher threshold.
> >>>> +        * This value cannot exceed the *nb_events_limit*
> >>>> +        * which was previously supplied to rte_event_dev_configure().
> >>>> +        * This should be set to '-1' for *open system*.
> >>>> +        */
> >>>> +       uint16_t dequeue_depth;
> >>>> +       /**< Configure number of bulk dequeues for this event port.
> >>>> +        * This value cannot exceed the *nb_event_port_dequeue_depth*
> >>>> +        * which previously supplied to rte_event_dev_configure().
> >>>> +        * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
> >>>> +        */
> >>>> +       uint16_t enqueue_depth;
> >>>> +       /**< Configure number of bulk enqueues for this event port.
> >>>> +        * This value cannot exceed the *nb_event_port_enqueue_depth*
> >>>> +        * which previously supplied to rte_event_dev_configure().
> >>>> +        * Ignored when device is not RTE_EVENT_DEV_CAP_BURST_MODE capable.
> >>>> +        */
> >>>>         uint8_t disable_implicit_release;
> >>>>         /**< Configure the port not to release outstanding events in
> >>>>          * rte_event_dev_dequeue_burst(). If true, all events received through
> >>>> @@ -733,6 +911,14 @@ struct rte_event_port_conf {
> >>>>  rte_event_port_default_conf_get(uint8_t dev_id, uint8_t port_id,
> >>>>                                 struct rte_event_port_conf *port_conf);
> >>>>
> >>>> +int
> >>>> +rte_event_port_default_conf_get_v20(uint8_t dev_id, uint8_t port_id,
> >>>> +                               struct rte_event_port_conf_v20 *port_conf);
> >>>> +
> >>>> +int
> >>>> +rte_event_port_default_conf_get_v21(uint8_t dev_id, uint8_t port_id,
> >>>> +                                     struct rte_event_port_conf *port_conf);
> >>>
> >>> Hi Timothy,
> >>>
> >>> + ABI Maintainers (Ray, Neil)
> >>>
> >>> # As per my understanding, the structures can not be versioned, only
> >>> function can be versioned.
> >>> i.e we can not make any change to " struct rte_event_port_conf"
> >>
> >> So the answer is (as always): depends
> >>
> >> If the structure is being use in inline functions is when you run into trouble
> >> - as knowledge of the structure is embedded in the linked application.
> >>
> >> However if the structure is _strictly_ being used as a non-inlined function parameter,
> >> It can be safe to version in this way.
> >
> > But based on the optimization applied when building the consumer code
> > matters. Right?
> > i.e compiler can "inline" it, based on the optimization even the
> > source code explicitly mentions it.
>
> Well a compiler will typically only inline within the confines of a given object file, or
> binary, if LTO is enabled.

>
> If a function symbol is exported from library however, it won't be inlined in a linked application.

Yes, With respect to that function.
But the application can use struct rte_event_port_conf in their code
and it can be part of other structures.
Right?


> The compiler doesn't have enough information to inline it.
> All the compiler will know about it is it's offset in memory, and it's signature.
>
> >
> >
> >>
> >> So just to be clear, it is still the function that is actually being versioned here.
> >>
> >>>
> >>> # We have a similar case with ethdev and it deferred to next release v20.11
> >>> http://patches.dpdk.org/patch/69113/
> >>
> >> Yes - I spent a why looking at this one, but I am struggling to recall,
> >> why when I looked it we didn't suggest function versioning as a potential solution in this case.
> >>
> >> Looking back at it now, looks like it would have been ok.
> >
> > Ok.
> >
> >>
> >>>
> >>> Regarding the API changes:
> >>> # The slow path changes general looks good to me. I will review the
> >>> next level in the coming days
> >>> # The following fast path changes bothers to me. Could you share more
> >>> details on below change?
> >>>
> >>> diff --git a/app/test-eventdev/test_order_atq.c
> >>> b/app/test-eventdev/test_order_atq.c
> >>> index 3366cfc..8246b96 100644
> >>> --- a/app/test-eventdev/test_order_atq.c
> >>> +++ b/app/test-eventdev/test_order_atq.c
> >>> @@ -34,6 +34,8 @@
> >>>                         continue;
> >>>                 }
> >>>
> >>> +               ev.flow_id = ev.mbuf->udata64;
> >>> +
> >>> # Since RC1 is near, I am not sure how to accommodate the API changes
> >>> now and sort out ABI stuffs.
> >>> # Other concern is eventdev spec get bloated with versioning files
> >>> just for ONE release as 20.11 will be OK to change the ABI.
> >>> # While we discuss the API change, Please send deprecation notice for
> >>> ABI change for 20.11,
> >>> so that there is no ambiguity of this patch for the 20.11 release.
> >>>

  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-27  4:37 [dpdk-dev] [PATCH 00/27] event/dlb Intel DLB PMD Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 01/27] eventdev: dlb upstream prerequisites Tim McDaniel
2020-06-27  7:44   ` Jerin Jacob
2020-06-29 19:30     ` McDaniel, Timothy
2020-06-30  4:21       ` Jerin Jacob
2020-06-30 15:37         ` McDaniel, Timothy
2020-06-30 15:57           ` Jerin Jacob
2020-06-30 19:26             ` McDaniel, Timothy
2020-06-30 20:40               ` Pavan Nikhilesh Bhagavatula
2020-06-30 21:07                 ` McDaniel, Timothy
2020-07-01  4:50               ` Jerin Jacob
2020-07-01 16:48                 ` McDaniel, Timothy
2020-06-30 11:22     ` Kinsella, Ray
2020-06-30 11:30       ` Jerin Jacob
2020-06-30 11:36         ` Kinsella, Ray
2020-06-30 12:14           ` Jerin Jacob [this message]
2020-07-02 15:21             ` Kinsella, Ray
2020-07-02 16:35               ` McDaniel, Timothy
2020-06-27  4:37 ` [dpdk-dev] [PATCH 02/27] eventdev: do not pass disable_implicit_release bit to trace macro Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 03/27] event/dlb: add shared code version 10.7.9 Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 04/27] event/dlb: add make and meson build infrastructure Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 05/27] event/dlb: add DLB documentation Tim McDaniel
2020-07-09  3:29   ` Eads, Gage
2020-06-27  4:37 ` [dpdk-dev] [PATCH 06/27] event/dlb: add dynamic logging Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 07/27] event/dlb: add private data structures and constants Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 08/27] event/dlb: add definitions shared with LKM or shared code Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 09/27] event/dlb: add inline functions used in multiple files Tim McDaniel
2020-07-07 12:02   ` Bruce Richardson
2020-07-07 14:33     ` McDaniel, Timothy
2020-06-27  4:37 ` [dpdk-dev] [PATCH 10/27] event/dlb: add PFPMD-specific interface layer to shared code Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 11/27] event/dlb: add flexible PMD to device interfaces Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 12/27] event/dlb: add the PMD's public interfaces Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 13/27] event/dlb: add xstats support Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 14/27] event/dlb: add PMD self-tests Tim McDaniel
2020-07-10 20:42   ` Eads, Gage
2020-07-29 18:56     ` McDaniel, Timothy
2020-06-27  4:37 ` [dpdk-dev] [PATCH 15/27] event/dlb: add probe Tim McDaniel
2020-07-09  3:45   ` Eads, Gage
2020-06-27  4:37 ` [dpdk-dev] [PATCH 16/27] event/dlb: add infos_get and configure Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 17/27] event/dlb: add queue_def_conf and port_def_conf Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 18/27] event/dlb: add queue setup Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 19/27] event/dlb: add port_setup Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 20/27] event/dlb: add port_link Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 21/27] event/dlb: add queue_release and port_release Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 22/27] event/dlb: add port_unlink and port_unlinks_in_progress Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 23/27] event/dlb: add eventdev_start Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 24/27] event/dlb: add timeout_ticks, dump, xstats, and selftest Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 25/27] event/dlb: add enqueue and its burst variants Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 26/27] event/dlb: add dequeue, dequeue_burst, and variants Tim McDaniel
2020-06-27  4:37 ` [dpdk-dev] [PATCH 27/27] event/dlb: add eventdev_stop and eventdev_close Tim McDaniel
     [not found] <1593232671-5690-0-git-send-email-timothy.mcdaniel@intel.com>
2020-07-30 19:49 ` [dpdk-dev] [PATCH 00/27] Add Intel DLM PMD to 20.11 McDaniel, Timothy
2020-07-30 19:49   ` [dpdk-dev] [PATCH 01/27] eventdev: dlb upstream prerequisites McDaniel, Timothy
2020-08-11 17:44     ` Jerin Jacob
  -- strict thread matches above, loose matches on Subject: below --
2020-06-12 21:24 [dpdk-dev] [PATCH 00/27] V1 event/dlb add Intel DLB PMD McDaniel, Timothy
2020-06-12 21:24 ` [dpdk-dev] [PATCH 01/27] eventdev: dlb upstream prerequisites McDaniel, Timothy
2020-06-13  3:59   ` Jerin Jacob
2020-06-13 10:43     ` Mattias Rönnblom
2020-06-18 15:51       ` McDaniel, Timothy
2020-06-18 15:44     ` McDaniel, Timothy

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