Re: [dpdk-dev] [PATCH v2 0/4] Introduce net bus

["Gaëtan Rivet" <gaetan.rivet@6wind.com>]

Hi Thomas,

On Thu, Jun 08, 2017 at 09:31:23AM +0200, Thomas Monjalon wrote:
> I'm sorry, I do not understand the description.
> Please start with a real problem statement and explain how it is solved.
> Thanks

Sure.

Currently, we probe devices by using

./usertools/dpkd-devbind.py -b igb_uio 00:02.0
./build/app/whatever -w 00:02.0
./usertools/dpkd-devbind.py -b ixgbe 00:02.0

Wouldn't it be nice to be able to:

./build/app/whatever -w ens2

Instead?

Many things are missing for this. This PoC only shows the simplest
case with a bifurcated driver, but the concept is there.

This bus is an intepretation layer to transform a kernel netdevice name
into a usable DPDK device, which should give enough info about its
dependencies: bus, IO module, resource management policies,
etc... to prepare it.

I plan to add binding / unbinding afterward, and I wanted to
propose this early enough as there were talks of kernel control plane,
and this could be a building block to this general direction.

Auto-unbind assumes a clean exit from the DPDK application. This might
be a big departure from current assumptions, where buses very seldom
plan for ending operations. i.e. rte_bus has scan and probe, but no
remove API. While unplug should soon exist, this is a crude workaround.

-- 
Gaëtan Rivet
6WIND