From: Andrew Lunn <andrew@lunn.ch>
To: Daniel Santos <daniel.santos@pobox.com>
Cc: "Russell King - ARM Linux admin" <linux@armlinux.org.uk>,
"René van Dorst" <opensource@vdorst.com>,
sean.wang@mediatek.com, f.fainelli@gmail.com,
davem@davemloft.net, matthias.bgg@gmail.com,
vivien.didelot@gmail.com, frank-w@public-files.de,
netdev@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-mips@vger.kernel.org
Subject: Re: [PATCH RFC net-next 1/5] net: dsa: mt7530: Convert to PHYLINK API
Date: Tue, 25 Jun 2019 22:41:48 +0200 [thread overview]
Message-ID: <20190625204148.GB27733@lunn.ch> (raw)
In-Reply-To: <4fc51dc4-0eec-30d7-86d1-3404819cf6fe@pobox.com>
On Tue, Jun 25, 2019 at 02:27:55PM -0500, Daniel Santos wrote:
> On 6/25/19 2:02 PM, Andrew Lunn wrote:
> >> But will there still be a mechanism to ignore link partner's advertising
> >> and force these parameters?
> > >From man 1 ethtool:
> >
> > -a --show-pause
> > Queries the specified Ethernet device for pause parameter information.
> >
> > -A --pause
> > Changes the pause parameters of the specified Ethernet device.
> >
> > autoneg on|off
> > Specifies whether pause autonegotiation should be enabled.
> >
> > rx on|off
> > Specifies whether RX pause should be enabled.
> >
> > tx on|off
> > Specifies whether TX pause should be enabled.
> >
> > You need to check the driver to see if it actually implements this
> > ethtool call, but that is how it should be configured.
> >
> > Andrew
> >
> Thank you Andrew,
>
> So in this context, my question is the difference between "enabling" and
> "forcing". Here's that register for the mt7620 (which has an mt7530 on
> its die): https://imgur.com/a/pTk0668 I believe this is also what René
> is seeking clarity on?
Lets start with normal operation. If the MAC supports pause or asym
pause, it calls phy_support_sym_pause() or phy_support_asym_pause().
phylib will then configure the PHY to advertise pause as appropriate.
Once auto-neg has completed, the results of the negotiation are set in
phydev. So phdev->pause and phydev->asym_pause. The MAC callback is
then used to tell the MAC about the autoneg results. The MAC should be
programmed using the values in phdev->pause and phydev->asym_pause.
For ethtool, the MAC driver needs to implement .get_pauseparam and
.set_pauseparam. The set_pauseparam needs to validate the settings,
using phy_validate_pause(). If valid, phy_set_asym_pause() is used to
tell the PHY about the new configuration. This will trigger a new
auto-neg if auto-neg is enabled, and the results will be passed back
in the usual way. If auto-neg is disabled, or pause auto-neg is
disabled, the MAC should configure pause directly based on the
settings passed.
Looking at the data sheet page, you want FORCE_MODE_Pn set. You never
want the MAC directly talking to the PHY. Bad things will happen.
Then use FORCE_RX_FC_Pn and FORCE_TX_Pn to reflect phydev->pause and
phydev->asym_pause.
The same idea applies when using phylink.
Andrew
next prev parent reply other threads:[~2019-06-25 20:42 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-24 14:52 [PATCH RFC net-next 0/5] net: dsa: MT7530: Convert to PHYLINK and add support for port 5 René van Dorst
2019-06-24 14:52 ` [PATCH RFC net-next 1/5] net: dsa: mt7530: Convert to PHYLINK API René van Dorst
2019-06-24 15:39 ` Russell King - ARM Linux admin
2019-06-25 11:31 ` René van Dorst
2019-06-25 12:10 ` Russell King - ARM Linux admin
2019-06-25 18:37 ` Daniel Santos
2019-06-25 19:02 ` Andrew Lunn
2019-06-25 19:27 ` Daniel Santos
2019-06-25 20:41 ` Andrew Lunn [this message]
2019-06-25 21:07 ` René van Dorst
2019-06-25 21:21 ` Russell King - ARM Linux admin
2019-06-27 19:09 ` Daniel Santos
2019-06-27 19:28 ` Andrew Lunn
2019-06-28 7:16 ` Daniel Santos
2019-06-25 21:13 ` Russell King - ARM Linux admin
2019-06-25 20:24 ` Vladimir Oltean
2019-06-25 21:53 ` Russell King - ARM Linux admin
2019-06-25 22:14 ` Vladimir Oltean
2019-06-25 22:57 ` Russell King - ARM Linux admin
2019-06-25 23:10 ` Vladimir Oltean
2019-06-25 23:13 ` Vladimir Oltean
2019-06-26 1:52 ` Andrew Lunn
2019-06-26 7:41 ` Russell King - ARM Linux admin
2019-06-26 8:46 ` Vladimir Oltean
2019-06-26 9:04 ` Russell King - ARM Linux admin
2019-06-25 0:58 ` Daniel Santos
2019-06-25 11:43 ` René van Dorst
2019-06-24 14:52 ` [PATCH RFC net-next 2/5] dt-bindings: net: dsa: mt7530: Add support for port 5 René van Dorst
2019-06-24 14:52 ` [PATCH RFC net-next 3/5] " René van Dorst
2019-06-24 14:52 ` [PATCH RFC net-next 4/5] dt-bindings: net: dsa: mt7530: Add mediatek,ephy-handle to isolate ext. phy René van Dorst
2019-06-24 21:56 ` Florian Fainelli
2019-06-25 9:30 ` René van Dorst
2019-06-25 19:16 ` Florian Fainelli
2019-06-24 14:52 ` [PATCH RFC net-next 5/5] net: dsa: mt7530: Add mediatek,ephy-handle to isolate external phy René van Dorst
2019-06-24 21:52 ` Andrew Lunn
2019-06-25 0:22 ` Daniel Santos
2019-06-25 8:24 ` René van Dorst
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190625204148.GB27733@lunn.ch \
--to=andrew@lunn.ch \
--cc=daniel.santos@pobox.com \
--cc=davem@davemloft.net \
--cc=f.fainelli@gmail.com \
--cc=frank-w@public-files.de \
--cc=linux-mediatek@lists.infradead.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=matthias.bgg@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=opensource@vdorst.com \
--cc=sean.wang@mediatek.com \
--cc=vivien.didelot@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).