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

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2016-05-20 11:37, Bruce Richardson:
> 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.

Yes, everything can be discussed, especially the ethdev API which is far
from being perfect :)