Event device early back-pressure indication

[Jerin Jacob]

On Thu, Apr 13, 2023 at 12:24 PM Mattias Rönnblom
<mattias.ronnblom at ericsson.com> wrote:
>
>
> void
> rte_event_return_new_credits(...);
>
> Thoughts?

I see the following cons on this approach.

# Adding multiple APIs in fast path to driver layer may not
performance effective solution.
# At least for cnxk HW, credits are for device, not per port. So cnxk
HW implementation can not use this scheme.

Alternative solution could be, adding new flag for
rte_enqueue_new_burst(), where drivers waits until credit is available
to reduce the application overhead
and support in different HW implementations if this use case critical.

 #define RTE_EVENT_FLAG_WAIT_TILL_CREDIT_AVILABLE (UINT32_C(1) << 0)


>
> Best regards,
>         Mattias