[RFC] eventdev: remove single-event enqueue operation

[Jerin Jacob]

On Fri, Jun 9, 2023 at 11:18 PM Mattias Rönnblom
<mattias.ronnblom at ericsson.com> wrote:
>
> Eliminate non-burst enqueue operation from Eventdev.
>
> The effect of this change is to reduce Eventdev code complexity
> somewhat and slightly improve performance.
>
> The single-event enqueue shortcut provided a very minor performance
> advantage in some situations (e.g., with a compile time-constant burst
> size of '1'), but would in other situations cause a noticeable
> performance penalty (e.g., rte_event_enqueue_forward_burst() with run
> time-variable burst sizes varying between '1' and larger burst sizes).
>
> Signed-off-by: Mattias Rönnblom <mattias.ronnblom at ericsson.com>

>
> -typedef uint16_t (*event_enqueue_t)(void *port, const struct rte_event *ev);
> -/**< @internal Enqueue event on port of a device */
> -
>  typedef uint16_t (*event_enqueue_burst_t)(void *port,
>                                           const struct rte_event ev[],
>                                           uint16_t nb_events);
> @@ -45,8 +42,6 @@ typedef uint16_t (*event_crypto_adapter_enqueue_t)(void *port,
>  struct rte_event_fp_ops {
>         void **data;
>         /**< points to array of internal port data pointers */
> -       event_enqueue_t enqueue;
> -       /**< PMD enqueue function. */

Can we remove "dequeue" as well?
In any event, Please send a deprecation notice as it is an ABI change,
and we need to get merge the deprecation notice patch for v23.07.
I can review the deprecation notice patch quickly as soon as you send
it to make forward progress.


>         event_enqueue_burst_t enqueue_burst;
>         /**< PMD enqueue burst function. */
>         event_enqueue_burst_t enqueue_new_burst;
> @@ -65,7 +60,7 @@ struct rte_event_fp_ops {
>         /**< PMD Tx adapter enqueue same destination function. */
>         event_crypto_adapter_enqueue_t ca_enqueue;
>         /**< PMD Crypto adapter enqueue function. */
> -       uintptr_t reserved[6];
> +       uintptr_t reserved[7];
>  } __rte_cache_aligned;
>