[dpdk-dev] [RFC v2 1/3] eventdev: allow for event devices requiring maintenance

[Jerin Jacob]

On Mon, Aug 2, 2021 at 9:45 PM Mattias Rönnblom
<mattias.ronnblom at ericsson.com> wrote:
>
> Extend Eventdev API to allow for event devices which require various
> forms of internal processing to happen, even when events are not
> enqueued to or dequeued from a port.
>
> RFC v2:
>   - Change rte_event_maintain() return type to be consistent
>     with the documentation.
>   - Remove unused typedef from eventdev_pmd.h.
>
> Signed-off-by: Mattias Rönnblom <mattias.ronnblom at ericsson.com>
> Tested-by: Richard Eklycke <richard.eklycke at ericsson.com>
> Tested-by: Liron Himi <lironh at marvell.com>
> ---
>  lib/eventdev/rte_eventdev.h | 62 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>
> +/**
> + * Maintain an event device.
> + *
> + * This function is only relevant for event devices which has the
> + * RTE_EVENT_DEV_CAP_REQUIRES_MAINT flag set. Such devices requires
> + * the application to call rte_event_maintain() on a port during periods
> + * which it is neither enqueuing nor dequeuing events from this
> + * port. No port may be left unattended.
> + *
> + * An event device's rte_event_maintain() is a low overhead function. In
> + * situations when rte_event_maintain() must be called, the application
> + * should do so often.

See rte_service_component_register() scheme, If a driver needs additional house
keeping it can use DPDK's service core scheme to abstract different driver
requirements.We may not need any public API for this.