Hi, 01/12/2017 06:48, Tan, Jianfeng: > Hi Thomas, > > Please help us to understand why we need this. > > > On 12/1/2017 8:36 AM, Thomas Monjalon wrote: > > The scan callback allows to spawn a vdev automatically > > given some custom scan rules. > > These two new APIs (rte_vdev_add_custom_scan and > rte_vdev_remove_custom_scan) are called by applications?
Yes, the application can use it but it can also be used by a DPDK driver or library. > If so, why not just constructing them in the parameters before passing > to rte_eal_init? It is not only for initialization because it will also work when we will have some hotplug mechanism where the scan is run during run-time. > > It is especially useful to create a TAP device automatically > > connected to a netdevice as remote. > > It sounds like an use case. Without this patch, I suppose we can already > do this? Yes we can already update the devargs list. But this hook will help to do it on hotplug events.
