Re: [PATCH v2 2/6] eventdev: add weight and affinity to queue attributes

[Jerin Jacob <jerinjacobk@gmail.com>]

On Tue, Apr 5, 2022 at 11:11 AM Shijith Thotton <sthotton@marvell.com> wrote:
>
> Extended eventdev queue QoS attributes to support weight and affinity.
> If queues are of same priority, events from the queue with highest

the same priority

> weight will be scheduled first. Affinity indicates the number of times,
> the subsequent schedule calls from an event port will use the same event
> queue. Schedule call selects another queue if current queue goes empty
> or schedule count reaches affinity count.
>
> To avoid ABI break, weight and affinity attributes are not yet added to
> queue config structure and relies on PMD for managing it. New eventdev

rely on

> op queue_attr_get can be used to get it from the PMD.
>
> Signed-off-by: Shijith Thotton <sthotton@marvell.com>

Please update the release notes.

With above change,

Acked-by: Jerin Jacob <jerinj@marvell.com>


> ---
>  lib/eventdev/eventdev_pmd.h | 22 +++++++++++++++++++++
>  lib/eventdev/rte_eventdev.c | 12 ++++++++++++
>  lib/eventdev/rte_eventdev.h | 38 +++++++++++++++++++++++++++++++++++--
>  3 files changed, 70 insertions(+), 2 deletions(-)
>
> diff --git a/lib/eventdev/eventdev_pmd.h b/lib/eventdev/eventdev_pmd.h
> index 3b85d9f7a5..5495aee4f6 100644
> --- a/lib/eventdev/eventdev_pmd.h
> +++ b/lib/eventdev/eventdev_pmd.h
> @@ -341,6 +341,26 @@ typedef int (*eventdev_queue_setup_t)(struct rte_eventdev *dev,
>  typedef void (*eventdev_queue_release_t)(struct rte_eventdev *dev,
>                 uint8_t queue_id);
>
> +/**
> + * Get an event queue attribute at runtime.
> + *
> + * @param dev
> + *   Event device pointer
> + * @param queue_id
> + *   Event queue index
> + * @param attr_id
> + *   Event queue attribute id
> + * @param[out] attr_value
> + *   Event queue attribute value
> + *
> + * @return
> + *  - 0: Success.
> + *  - <0: Error code on failure.
> + */
> +typedef int (*eventdev_queue_attr_get_t)(struct rte_eventdev *dev,
> +                                        uint8_t queue_id, uint32_t attr_id,
> +                                        uint32_t *attr_value);
> +
>  /**
>   * Set an event queue attribute at runtime.
>   *
> @@ -1231,6 +1251,8 @@ struct eventdev_ops {
>         /**< Set up an event queue. */
>         eventdev_queue_release_t queue_release;
>         /**< Release an event queue. */
> +       eventdev_queue_attr_get_t queue_attr_get;
> +       /**< Get an event queue attribute. */
>         eventdev_queue_attr_set_t queue_attr_set;
>         /**< Set an event queue attribute. */
>
> diff --git a/lib/eventdev/rte_eventdev.c b/lib/eventdev/rte_eventdev.c
> index a31e99be02..12b261f923 100644
> --- a/lib/eventdev/rte_eventdev.c
> +++ b/lib/eventdev/rte_eventdev.c
> @@ -838,6 +838,18 @@ rte_event_queue_attr_get(uint8_t dev_id, uint8_t queue_id, uint32_t attr_id,
>
>                 *attr_value = conf->schedule_type;
>                 break;
> +       case RTE_EVENT_QUEUE_ATTR_WEIGHT:
> +               *attr_value = RTE_EVENT_QUEUE_WEIGHT_LOWEST;
> +               if (dev->dev_ops->queue_attr_get)
> +                       return (*dev->dev_ops->queue_attr_get)(
> +                               dev, queue_id, attr_id, attr_value);
> +               break;
> +       case RTE_EVENT_QUEUE_ATTR_AFFINITY:
> +               *attr_value = RTE_EVENT_QUEUE_AFFINITY_LOWEST;
> +               if (dev->dev_ops->queue_attr_get)
> +                       return (*dev->dev_ops->queue_attr_get)(
> +                               dev, queue_id, attr_id, attr_value);
> +               break;
>         default:
>                 return -EINVAL;
>         };
> diff --git a/lib/eventdev/rte_eventdev.h b/lib/eventdev/rte_eventdev.h
> index 16e9d5fb5b..a6fbaf1c11 100644
> --- a/lib/eventdev/rte_eventdev.h
> +++ b/lib/eventdev/rte_eventdev.h
> @@ -222,8 +222,14 @@ struct rte_event;
>
>  /* Event device capability bitmap flags */
>  #define RTE_EVENT_DEV_CAP_QUEUE_QOS           (1ULL << 0)
> -/**< Event scheduling prioritization is based on the priority associated with
> - *  each event queue.
> +/**< Event scheduling prioritization is based on the priority and weight
> + * associated with each event queue. Events from a queue with highest priority
> + * is scheduled first. If the queues are of same priority, weight of the queues
> + * are considered to select a queue in a weighted round robin fashion.
> + * Subsequent dequeue calls from an event port could see events from the same
> + * event queue, if the queue is configured with an affinity count. Affinity
> + * count is the number of subsequent dequeue calls, in which an event port
> + * should use the same event queue if the queue is non-empty
>   *
>   *  @see rte_event_queue_setup(), rte_event_queue_attr_set()
>   */
> @@ -331,6 +337,26 @@ struct rte_event;
>   * @see rte_event_port_link()
>   */
>
> +/* Event queue scheduling weights */
> +#define RTE_EVENT_QUEUE_WEIGHT_HIGHEST   255
> +/**< Highest weight of an event queue
> + * @see rte_event_queue_attr_get(), rte_event_queue_attr_set()
> + */
> +#define RTE_EVENT_QUEUE_WEIGHT_LOWEST    0
> +/**< Lowest weight of an event queue
> + * @see rte_event_queue_attr_get(), rte_event_queue_attr_set()
> + */
> +
> +/* Event queue scheduling affinity */
> +#define RTE_EVENT_QUEUE_AFFINITY_HIGHEST   255
> +/**< Highest scheduling affinity of an event queue
> + * @see rte_event_queue_attr_get(), rte_event_queue_attr_set()
> + */
> +#define RTE_EVENT_QUEUE_AFFINITY_LOWEST    0
> +/**< Lowest scheduling affinity of an event queue
> + * @see rte_event_queue_attr_get(), rte_event_queue_attr_set()
> + */
> +
>  /**
>   * Get the total number of event devices that have been successfully
>   * initialised.
> @@ -684,6 +710,14 @@ rte_event_queue_setup(uint8_t dev_id, uint8_t queue_id,
>   * The schedule type of the queue.
>   */
>  #define RTE_EVENT_QUEUE_ATTR_SCHEDULE_TYPE 4
> +/**
> + * The weight of the queue.
> + */
> +#define RTE_EVENT_QUEUE_ATTR_WEIGHT 5
> +/**
> + * Affinity of the queue.
> + */
> +#define RTE_EVENT_QUEUE_ATTR_AFFINITY 6
>
>  /**
>   * Get an attribute from a queue.
> --
> 2.25.1
>