eventdev: add event pre-schedule hint

Add a new eventdev API to provide a hint to the eventdev PMD to
pre-schedule the next event into the event port, without releasing
the current flow context.
Eve

eventdev: add event pre-schedule hint

Add a new eventdev API to provide a hint to the eventdev PMD to
pre-schedule the next event into the event port, without releasing
the current flow context.
Event device that support this feature advertises the capability
using the RTE_EVENT_DEV_CAP_PRESCHEDULE_EXPLICIT capability flag.

Application can invoke `rte_event_port_preschedule` to hint the PMD,
if event device does not support this feature it is treated as a no-op.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

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eventdev: add event port pre-schedule modify

Some event devices allow pre-schedule types to be modified at
runtime on an event port.
Add `RTE_EVENT_DEV_CAP_PER_PORT_PRESCHEDULE` capability
to indica

eventdev: add event port pre-schedule modify

Some event devices allow pre-schedule types to be modified at
runtime on an event port.
Add `RTE_EVENT_DEV_CAP_PER_PORT_PRESCHEDULE` capability
to indicate that the event device supports this feature.

Add `rte_event_port_preschedule_modify()` API to modify the
pre-schedule type at runtime.
To avoid fastpath capability checks, the API reports -ENOTSUP
if the event device does not support this feature.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

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eventdev: introduce event pre-scheduling

Event pre-scheduling improves scheduling performance by assigning events
to event ports in advance when dequeues are issued.
The dequeue operation initiates

eventdev: introduce event pre-scheduling

Event pre-scheduling improves scheduling performance by assigning events
to event ports in advance when dequeues are issued.
The dequeue operation initiates the pre-schedule operation, which completes
in parallel without affecting the dequeued event flow contexts and
dequeue latency.

Event devices can indicate pre-scheduling capabilities using
`RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE` and
`RTE_EVENT_DEV_CAP_EVENT_PRESCHEDULE_ADAPTIVE` via the event device info
function `info.event_dev_cap`.

Applications can select the pre-schedule type and configure it through
`rte_event_dev_config.preschedule_type` during `rte_event_dev_configure`.

The supported pre-schedule types are:
* `RTE_EVENT_PRESCHEDULE_NONE` - No pre-scheduling.
* `RTE_EVENT_PRESCHEDULE` - Always issue a pre-schedule on dequeue.
* `RTE_EVENT_PRESCHEDULE_ADAPTIVE` - Delay issuing pre-schedule until
there are no forward progress constraints with the held flow contexts.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

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eventdev: add independent enqueue API

Support for independent enqueue feature and updates Event Device
and PMD feature list.

A new capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ is introduced. It
all

eventdev: add independent enqueue API

Support for independent enqueue feature and updates Event Device
and PMD feature list.

A new capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ is introduced. It
allows out-of-order enqueuing of RTE_EVENT_OP_FORWARD or RELEASE type
events on an event port where this capability is enabled.

To use this capability applications need to set flag
RTE_EVENT_PORT_CFG_INDEPENDENT_ENQ during port setup only if the
capability RTE_EVENT_DEV_CAP_INDEPENDENT_ENQ exists.

Signed-off-by: Abdullah Sevincer <abdullah.sevincer@intel.com>
Acked-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>

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doc: reorganize prog guide

Create categories in the index of the programmer's guide,
sort chapters and rewrite some titles for consistency.

Subdirectories are created for ethdev and eventdev
for gr

doc: reorganize prog guide

Create categories in the index of the programmer's guide,
sort chapters and rewrite some titles for consistency.

Subdirectories are created for ethdev and eventdev
for grouping the files together.

Useless link anchors at the beginning of files are removed,
the corresponding :ref: are replaced with :doc: links.

Signed-off-by: David Young <dave@youngcopy.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>

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