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Date: Sat, 04 Apr 2015 23:55:24 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: Richard Cochran <richardcochran@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: Configuring synchronous ethernet with ethtool?
On Sat, 2015-04-04 at 22:03 +0200, Richard Cochran wrote:
> On Sat, Apr 04, 2015 at 02:59:10PM +0100, Ben Hutchings wrote:
> > The 'manual' setting matches terminology in IEEE 802.3 (section 40.5.2).
> > There's no mention of 'preferred' there but perhaps this switch will
> > claim to be a single-port if you say it should prefer slave mode.
>
> Thanks for the reference. The switch I was talking about has control
> register 9 implemented exactly as described in 802.3, but the TRM
> description of bit 9.10 adds the word "prefer".
>
> > So, I like the idea but it should not be tied to SyncE only.
>
> Something like this?
>
> | ethtool property | effect |
> |-------------------------+--------------------|
> | synce-mode = none | 9.12 = 0 |
That's not 'none', it's just not forced. This would be used for both
asynchronous operation and for synchronous operation with negotiated
clock mode.
> | synce-mode = master | 9.12 = 1, 9.11 = 1 |
> | synce-mode = slave | 9.12 = 1, 9.11 = 0 |
So there are four different modes that should be selectable through
ethtool:
- Asynchronous [100BASE-T only]
- Synchronous, automatic
- Synchronous, master
- Synchronous, slave
> | port-type = multiport | 9.10 = 1 |
> | port-type = single-port | 9.10 = 0 |
For backward compatibility ethtool would also need to be able to report
'unknown' when the kernel or driver doesn't support this.
Ben.
--
Ben Hutchings
The most exhausting thing in life is being insincere. - Anne Morrow Lindberg
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