Re: [dpdk-dev] kernel binding of devices + hotplug

[Stephen Hemminger <stephen@networkplumber.org>]

My vote is to work with udev and not try to replace it.

Driverctl works well. Just not for bifurcated driver

On Fri, Apr 13, 2018, 9:31 AM Thomas Monjalon <thomas@monjalon.net> wrote:

> It's time to think (again) how we bind devices with kernel modules.
> We need to decide how we want to manage hotplugged devices with DPDK.
>
> A bit of history first.
> There was some code in DPDK for bind/unbind, but it has been removed
> in DPDK 1.7 - http://dpdk.org/commit/5d8751b83
> Copy of the commit message (in 2014):
> "
>         The bind/unbind operations should not be handled by the eal.
>         These operations should be either done outside of dpdk or
>         inside the PMDs themselves as these are their problems.
> "
>
> The question raised at this time (4 years ago) is still under discussion.
> Should we manage binding inside or outside DPDK?
> Should it be controlled in the application or in the OS base?
>
> As you know, we use dpdk-devbind.py.
> This tool lacks two major features:
>         - persistent configuration
>         - hotplug
>
> If we consider that the DPDK applications should be able to apply its own
> policy to choose the devices to bind, then we need to implement binding
> in the PMD (with EAL helpers).
>
> On the other hand, if we consider that it is the system responsibility,
> then we could choose systemd/udev and driverctl.
>
> The debate is launched!
>
> Please find more details in the references below.
>
> Announce of driverctl:
>         http://dpdk.org/ml/archives/dev/2015-December/029500.html
> Repository of driverctl:
>         https://gitlab.com/driverctl/driverctl
>
> Discussion about binding script and driverctl:
>         http://dpdk.org/ml/archives/dev/2018-April/095687.html
>
> Patch to implement binding in DPDK (for hotplug):
>         http://dpdk.org/ml/archives/dev/2018-April/095714.html
>
> Discussion in the same hotplug series:
>         http://dpdk.org/ml/archives/dev/2018-April/097058.html
>
>
>
>