netdev - Re: [RFC v2 net-next 1/2] rtnetlink: Add new RTM_GETSYNCESTATE message to get SyncE status

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Date:   Sun, 29 Aug 2021 22:16:06 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Machnikowski, Maciej" <maciej.machnikowski@...el.com>
Cc:     Richard Cochran <richardcochran@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "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>
Subject: Re: [RFC v2 net-next 1/2] rtnetlink: Add new RTM_GETSYNCESTATE
 message to get SyncE status

> > I have nothing against exposing the DPLL if you need to, however I'd like to have
> > an interface that support plain Gigabit as well.  This could be done in a generic
> > way by offering Control Register 9 as described in 802.3.

Are we talking about Clause 22, register 9, also known as MII_CTRL1000?

> This part of Gigabit interface is a different part of SyncE device. It controls Master/Slave
> operation of auto-negotiation.

This is controlled using ethtool -s

      ethtool -s devname [speed N] [duplex half|full] [port tp|aui|bnc|mii]
              ....
              [sopass xx:yy:zz:aa:bb:cc] [master-slave preferred-
              master|preferred-slave|forced-master|forced-slave]

      Andrew