netdev - Re: [net-next 1/5] ice: add the virtchnl handler for AdminQ command

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Message-ID: <20200714112421.06f20c5a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 14 Jul 2020 11:24:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Wang, Haiyue" <haiyue.wang@...el.com>
Cc:     "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "Lu, Nannan" <nannan.lu@...el.com>,
        "Bowers, AndrewX" <andrewx.bowers@...el.com>
Subject: Re: [net-next 1/5] ice: add the virtchnl handler for AdminQ command

On Tue, 14 Jul 2020 01:29:40 +0000 Wang, Haiyue wrote:
> > On Mon, 13 Jul 2020 10:43:16 -0700 Tony Nguyen wrote:  
> > > From: Haiyue Wang <haiyue.wang@...el.com>
> > >
> > > The DCF (Device Config Function) is a named trust VF (always with ID 0,
> > > single entity per PF port) that can act as a sole controlling entity to
> > > exercise advance functionality such as adding switch rules for the rest
> > > of VFs.  
> > 
> > But why? This looks like a bifurcated driver to me.
> 
> Yes, like bifurcated about flow control. This expands Intel AVF virtual channel
> commands, so that VF can talk to hardware indirectly, which is under control of
> PF. Then VF can set up the flow control for other VFs. This enrich current PF's
> Flow Director filter for PF itself only by ethtool. 

Could you say a little more about the application and motivation for
this?

We are talking about a single control domain here, correct?