[dpdk-dev] [PATCH v2] ethdev: add new RX/TX queue state arrays in rte_eth_dev_data

[Qiu, Michael]

On 2015/9/22 6:40, Stephen Hemminger wrote:
> On Wed, 16 Sep 2015 22:51:24 +0100
> Pablo de Lara <pablo.de.lara.guarch at intel.com> wrote:
>
>> This is important to avoid trying to start/stop twice a queue,
>> which will result in undefined behaviour
>> (which may cause RX/TX disruption).
>>
>> Mind that only the PMDs which have queue_start/stop functions
>> have been changed to update this field, as the functions will
>> check the queue state before switching it.
>>
>> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
> I agree that the DPDK API should check for buggy manipulation
> in the control path. But this should be done in generic code.
> Anything where you have to change any driver is making more work
> than necessary.

I agree with you, but I have a question, why we need expose the queue
start and stop function to app?

In my opinion, user app will hardly to start a device but stop the
device queue. what's the purpose of it?

Thanks,
Michael