netdev - Re: TJA1100 100Base-T1 PHY features via ethtool?

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Date:   Tue, 14 Aug 2018 09:13:32 +0200
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kernel@...gutronix.de
Subject: Re: TJA1100 100Base-T1 PHY features via ethtool?

On Mon, Aug 13, 2018 at 12:53:35PM -0700, Florian Fainelli wrote:
> On 08/13/2018 12:35 PM, Michael Grzeschik wrote:
> > Hi David,
> > 
> > I use a special 100Base-T1 phy (NXP TJA1100 [1]) that has some features
> > like:
> > 
> > - enabling/disabling test modes
> > - fault detection
> > - switching managed/autonomous mode
> > - signal quality indication
> > - ...
> > 
> > I already implemented the support of the features with the
> > ethtool --get/set-phy-tunables features by adding ethtool_phy_tunables:
> > 
> > ETHTOOL_PHY_TEST_MODE
> > ETHTOOL_PHY_FAULT_DETECTION
> > ETHTOOL_PHY_MANAGED_MODE
> > ETHTOOL_PHY_SIGNAL_QUALITY
> > 
> > Before posting my series I wanted to ensure that this is the preferred
> > interface for those options.
> 
> The tunable interface is there, but is very limited. A few months ago, I
> had started proposing an interface to support PHY test modes [1] (the
> standard IEEE 802.3 defined ones) but a lot of it should now be migrated
> to the work that Michal is doing on the conversion of ethtool to netlink
> [2].
> 
> [1]: https://lkml.org/lkml/2018/4/27/1172
> [2]: https://www.spinics.net/lists/netdev/msg516233.html

The ethtool userspace tool is somehow odd to program on,
so switching to netlink is definitively a great idea!

> > 
> > I found a series from 2016 [2] that implements the userspace part for
> > the loopback feature of some phys, that did not get mainline so far
> > which makes me wonder if ethtool is still the way to go.
> 
> ethtool is being converted to netlink, and that will be a much more
> flexible interface to work with since it is basically easily extensible
> (unlike the current ethtool + ioctl approach).

Yes, netlink sounds absolutely more useful here.

> Back when the patches were proposed, we just had mild disagreement on
> the loopback terminology being used, and then nothing happened.

Right, thanks for clarification!

> 
> > 
> > [1] https://www.nxp.com/docs/en/data-sheet/TJA1100.pdf
> > [2] https://www.spinics.net/lists/netdev/msg406614.html
> > 
> > Thanks,
> > Michael
> > 
> 
> 
> -- 
> Florian
> 

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