[dpdk-dev] [PATCH] ethdev: fix port ID retrieval on vdev attach

Thomas Monjalon thomas at monjalon.net
Wed Jul 11 12:52:59 CEST 2018


11/07/2018 12:15, Andrew Rybchenko:
> On 11.07.2018 13:02, Thomas Monjalon wrote:
> > 11/07/2018 11:49, Andrew Rybchenko:
> >> From: Ivan Malov <ivan.malov at oktetlabs.ru>
> >>
> >> Attaching a vdev port may result in multiple
> >> ports actually added because a vdev port may
> >> have slave devices to be attached implicitly.
> >>
> >> Ethdev attach API has to fill in the port ID
> >> to be read back by the user and what it does
> >> is take the last assigned ID from the common
> >> list after attach completion. Such an ID may
> >> belong to a slave device and not to the vdev.
> >>
> >> This mistake must be precluded by requesting
> >> the port ID by name of device being attached.
> > No, the real issue is using this function rte_eth_dev_attach.
> > It is broken since day 1.
> > Mixing EAL devargs and ethdev port cannot work by design.
> >
> > If you want to attach a device, you must add it with
> > 	rte_eal_hotplug_add
> > and wait for the driver to probe the ports
> > (which can be ethdev or other classes).
> 
> Yes, I totally agree. Doesn't it deserve to be fixed at least in stable?

The concern with stable is to keep it stable :)
I'm afraid this change can introduce more regressions.

> > We should take these actions in 18.08:
> > 	- deprecate rte_eth_dev_attach/rte_eth_dev_detach
> > 	- deprecate rte_eal_dev_attach/rte_eal_dev_detach
> > I did not take time to send the deprecation notices yet.
> > Feel free to deprecate these functions yourself.
> 
> Should we deprecate it right now in 18.08 and schedule removal to 18.11?

Yes, we should mark it as deprecated in 18.08 and plan for removal in 18.11.
It is good to get it removed from the next LTS which is 18.11.

> Or just add deprecation notice in 18.08, mark deprecated in 18.11 and
> remove later?

Later is too late :)





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