Re: [dpdk-dev] KNI discussion in userspace event

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

2016-10-28 20:29, Igor Ryzhov:
> On Fri, Oct 28, 2016 Thomas Monjalon wrote:
> > 2016-10-28 15:51, Richardson, Bruce:
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas Monjalon
> > > > 2016-10-28 15:31, Ferruh Yigit:
> > > > > * Remove ethtool support ?
> > > >
> > > > That's the other part of KNI.
> > > > It works only for e1000/ixgbe. That's a niche.
> > >
> > > Yes, it's something we need to remove, but again, we need an
> > > alternative first.
> > >
> > > >
> > > > > Still there is some interest, will keep it. But not able to extend it
> > > > > to other drivers with current design.
> > > >
> > > > It should be removed one day.
> > > > We must seriously think about a generic alternative.
> > > > Either we add DPDK support in ethtool or we create a dpdk-ethtool.
> > > > (or at least a library as the one in examples/).
> > >
> > > I don't view that as a great path forward. Sure, we can do our own
> > > ethtool, but then people will look for ifconfig to work, and "ip" to work,
> > > etc. I view having a kernel proxy module as the best path here as it is
> > > tool agnostic on the userspace side, rather than trying to make every
> > > tool for working with kernel netdevs also have support for dpdk ports.
> >
> > Yes that's the ultimately best solution.
> > But:
> > - we need some cooperation of the kernel team
> > - ethtool manages a device (what DPDK provides) whereas iproute and others
> > manage a TCP/IP stack so is out of control of DPDK.
> 
> That's not true.
> iproute can control a lot of things like MAC address, promiscuous, MTU,
> etc. that cannot be controlled with ethtool.
> Just compare net_device_ops and ethtool_ops to see the difference.

Yes you're right. iproute was not a good example :)

> And the question is not only about tools, it is also about how Linux kernel
> works with network devices.
> And it uses net_device_ops, not ethtool_ops.

What do you mean exactly? I feel you have something in mind.