netdev - RE: [PATCH net-next 2/2] nfp: separate the port's upper state with lower phy state

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Message-ID: <DM6PR13MB3705B02A219219A4897A66C5FC8E9@DM6PR13MB3705.namprd13.prod.outlook.com>
Date:   Thu, 30 Mar 2023 02:57:34 +0000
From:   Yinjun Zhang <yinjun.zhang@...igine.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Louis Peens <louis.peens@...igine.com>,
        David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Simon Horman <simon.horman@...igine.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        oss-drivers <oss-drivers@...igine.com>
Subject: RE: [PATCH net-next 2/2] nfp: separate the port's upper state with
 lower phy state

On Wed, 29 Mar 2023 19:41:26 -0700, Jakub Kicinski wrote:
> On Thu, 30 Mar 2023 01:56:13 +0000 Yinjun Zhang wrote:
> > On Wed, 29 Mar 2023 12:24:22 -0700, Jakub Kicinski wrote:
> > > On Wed, 29 Mar 2023 16:45:48 +0200 Louis Peens wrote:
> > > > For nic application firmware, enable the ports' phy state at the
> > > > beginning. And by default its state doesn't change in pace with
> > > > the upper state, unless the ethtool private flag "link_state_detach"
> > > > is turned off by:
> > > >
> > > >  ethtool --set-private-flags <netdev> link_state_detach off
> > > >
> > > > With this separation, we're able to keep the VF state up while
> > > > bringing down the PF.
> > >
> > > This commit message is very confusing. Please rewrite it.
> >
> > How about
> > "
> > With this separation, the lower phy state of uplink port can be kept
> > link-on no matter what the upper admin state is.
> 
> What is "upper", in this context? grep the networking code for upper,
> is that what you mean?

Sorry, it's not that meaning. I'll remove this "upper", use netdev state
instead.

> 
> > Thus the corresponding
> > VFs can also link up and communicate with exterior through the uplink
> > port.
> > "