Re: [dpdk-dev] [PATCH v2] vhost: add support for dynamic vhost PMD creation

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, May 19, 2016 at 06:44:44PM +0200, Thomas Monjalon wrote:
> 2016-05-19 17:28, Ferruh Yigit:
> > On 5/19/2016 9:33 AM, Thomas Monjalon wrote:
> > > 2016-05-18 18:10, Ferruh Yigit:
> > >> Add rte_eth_from_vhost() API to create vhost PMD dynamically from
> > >> applications.
> > > 
> > > How is it different from rte_eth_dev_attach() calling rte_eal_vdev_init()?
> > > 
> > 
> > When used rte_eth_dev_attach(), application also needs to do:
> > rte_eth_dev_configure()
> > rte_eth_rx_queue_setup()
> > rte_eth_tx_queue_setup()
> > rte_eth_dev_start()
> > 
> > rte_eth_from_vhost() does these internally, easier to use for applications.
> 
> This argument is not sufficient.
> We are not going to add new APIs just for wrapping others.

Why not - if there is a sufficient increase in developer usability by doing so?
Having one API that saves an app from having to call 5 other APIs looks like
something that should always be given fair consideration. There will obviously
be other factors to take into account too, like numbers and types of parameters
to the replacement call vs the sub-calls, but I don't think a blanket ban is
justified.

Regards,
/Bruce