[dpdk-dev] [PATCH] eventdev: Add rte_errno return values to the enqueue and dequeue functions

[Bruce Richardson]

On Fri, Feb 10, 2017 at 03:02:21PM -0600, Gage Eads wrote:
> This change allows user software to differentiate between an invalid argument
> (such as an invalid queue_id or sched_type in an enqueued event) and
> backpressure from the event device.
> 
> The port and device ID checks are placed in RTE_LIBRTE_EVENTDEV_DEBUG header
> guards to avoid the performance hit in non-debug execution.
> 
> Signed-off-by: Gage Eads <gage.eads at intel.com>
> ---

Do we have some idea of the performance hit from these? It may be too
soon to know, given we don't have many drivers to test with, but if
there is no perf hit seen with the SW driver, I think we should look to
just always do this, rather than having it compile-time off. If it does
prove to be a performance problem we can look to #ifdef it out later.

/Bruce