[dpdk-dev] [PATCH v2] librte_ether: release memory in uninit function.

[Tetsuya Mukawa]

On 2015/07/06 20:35, Qiu, Michael wrote:
> Hi, all
>
> As we has gap on the memory release action to be done in which step, I
> appreciate all your comments on this patch.
>
> Currently, the correct quit sequence for testpmd is stop() --->
> port_stop() --> port_close() --> quit(). This will lead lots of memory
> not released by default, like queues.
>
> We have 3 potential proposals(normal case means without hotplug):
>
> 1. Those memory release in close()  other left in uninit()
>     This will work fine for both hotplug case and normal case.

+1

I assume that once close() is called, we cannot start the port again
without hotplugging.
This is my premise.

It might be good that we move finalization code to close() as much as
possible, because of followings.
1. Anyway, once close() is called, we cannot start the port again. So it
should be ok to free resources in close().
2. Non-hotplugging applications can release resources if we implement
finalization code to close().

Also I guess Stephen's suggestion is important to keep code clean.
It may be good that 'dev->data->rx/tx_queues[queue_id]' are freed in
rx/tx_queue_release() of each PMD, and rx/tx_queue_release() will be
called by rte_eth_dev_close(). Also 'dev->data->rx/tx_queues[]' should
be freed in ethdev.c.

> 3. Combine close() and uninit(), only one will be left.
>     This will work fine for both hotplug case and normal case. But it
> may change a lot, such as logic.

I guess this will be second option.  But I agree we need to change a
lot. Also after enabling hotplug by default, when someone only wants to
close the port, it will be impossible.

Regards,
Tetsuya