Re: [dpdk-dev] DPDK Features for Q1 2015

["Zhu, Heqing" <heqing.zhu@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Liang, Cunming
> Sent: Wednesday, October 22, 2014 8:06 AM
> To: Zhou, Danny; Thomas Monjalon; O'driscoll, Tim
> Cc: dev@dpdk.org; Fastabend, John R; Ronciak, John
> Subject: Re: [dpdk-dev] DPDK Features for Q1 2015
> 
> > >
> > > This design allows to keep the configuration code in one place: the
> kernel.
> > > In the meantime, we are trying to add a lot of code to configure the
> > > NICs, which looks to be a duplication of effort.
> > > Why should we have two ways of configuring e.g. flow director?

[heqing] There will be multiple choices for DPDK usage model if/after this feature is available, 
the customer can choose the DPDK with or without the bifurcated driver. 

> [Liang, Cunming] The HW sometimes provides additional ability than existing
> abstraction API.
> On that time(HW ability is a superset to the abstraction wrapper, e.g. flow
> director), we need to provide another choice.
> Ethtools is good, but can't apply anything supported in NIC.
> Bifurcated driver considers a lot on reusing existing rx/tx routine.
> We'll send RFC patch soon if kernel patch moving fast.
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Zhou, Danny
> > Sent: Wednesday, October 22, 2014 10:44 PM
> > To: Thomas Monjalon; O'driscoll, Tim
> > Cc: dev@dpdk.org; Fastabend, John R; Ronciak, John
> > Subject: Re: [dpdk-dev] DPDK Features for Q1 2015
> >
> > Thomas,
> >
> > In terms of the bifurcated driver, it is actually the same thing.
> > Specifically, the bifurcated driver PMD in DPDK depends on kernel
> > code(af_packet and 10G/40G NIC) changes. Once the kernel patches are
> > upstreamed, the corresponding DPDK PMDs patches will be submitted to
> > dpdk.org. John Fastabend and John Ronciak are working with very
> > closely to achieve the same goal.
> >
> > -Danny
> >
> > > -----Original Message-----
> > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Thomas
> Monjalon
> > > Sent: Wednesday, October 22, 2014 10:21 PM
> > > To: O'driscoll, Tim
> > > Cc: dev@dpdk.org; Fastabend, John R; Ronciak, John
> > > Subject: Re: [dpdk-dev] DPDK Features for Q1 2015
> > >
> > > Thanks Tim for sharing your plan.
> > > It's really helpful to improve community collaboration.
> > >
> > > I'm sure it's going to generate some interesting discussions.
> > > Please take care to discuss such announce on dev list only.
> > > The announce@dpdk.org list is moderated to keep a low traffic.
> > >
> > > I would like to open discussion about a really important feature,
> > > showed last week by John Fastabend and John Ronciak during LinuxCon:
> > >
> > > > Bifurcated Driver: With the Bifurcated Driver, the kernel will
> > > > retain direct control of the NIC, and will assign specific queue pairs to
> DPDK.
> > > > Configuration of the NIC is controlled by the kernel via ethtool.
> > >
> > > This design allows to keep the configuration code in one place: the
> kernel.
> > > In the meantime, we are trying to add a lot of code to configure the
> > > NICs, which looks to be a duplication of effort.
> > > Why should we have two ways of configuring e.g. flow director?
> > >
> > > Since you at Intel, you'll be supporting your code, I am fine for
> > > duplication, but I feel it's worth arguing why both should be available
> instead of one.
> > >
> > > --
> > > Thomas