netdev - Re: [RFC v5 net-next 2/5] rtnetlink: Add new RTM_GETEECSTATE message to get SyncE status

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Date:   Wed, 27 Oct 2021 18:10:46 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     "Machnikowski, Maciej" <maciej.machnikowski@...el.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "abyagowi@...com" <abyagowi@...com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>,
        "saeed@...nel.org" <saeed@...nel.org>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>
Subject: Re: [RFC v5 net-next 2/5] rtnetlink: Add new RTM_GETEECSTATE message
 to get SyncE status

On Wed, Oct 27, 2021 at 01:16:22PM +0000, Machnikowski, Maciej wrote:
> 
> 
> > -----Original Message-----
> > From: Ido Schimmel <idosch@...sch.org>
> > Sent: Wednesday, October 27, 2021 9:10 AM
> > To: Machnikowski, Maciej <maciej.machnikowski@...el.com>
> > Subject: Re: [RFC v5 net-next 2/5] rtnetlink: Add new RTM_GETEECSTATE
> > message to get SyncE status
> > 
> > On Tue, Oct 26, 2021 at 07:31:43PM +0200, Maciej Machnikowski wrote:
> > > +/* SyncE section */
> > > +
> > > +enum if_eec_state {
> > > +	IF_EEC_STATE_INVALID = 0,
> > > +	IF_EEC_STATE_FREERUN,
> > > +	IF_EEC_STATE_LOCKED,
> > > +	IF_EEC_STATE_LOCKED_HO_ACQ,
> > 
> > Is this referring to "Locked mode, acquiring holdover: This is a
> > temporary mode, when coming from free-run, to acquire holdover
> > memory."
> > ?
> 
> Locked HO ACQ means locked and holdover acquired. It's the state that
> allows transferring to the holdover state. Locked means that we locked
> our frequency and started acquiring the holdover memory.

So that's a transient state, right? FWIW, I find it weird to call such a
state "LOCKED".

>  
> > It seems ice isn't using it, so maybe drop it? Can be added later in
> > case we have a driver that can report it
> 
> I'll update the driver in the next revision

You mean update it to use "IF_EEC_STATE_LOCKED_HO_ACQ" instead of
"IF_EEC_STATE_LOCKED"?

Regardless, would be good to document these values.

>  
> > There is also "Locked mode, holdover acquired: This is a steady state
> > mode, entered when holdover memory is acquired." But I assume that's
> > "IF_EEC_STATE_LOCKED"
> > 
> > > +	IF_EEC_STATE_HOLDOVER,
> > > +};