Linux-Doc Archive on lore.kernel.org
 help / color / Atom feed
From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: "Madalin Bucur (OSS)" <madalin.bucur@oss.nxp.com>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Florinel Iordache <florinel.iordache@nxp.com>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"f.fainelli@gmail.com" <f.fainelli@gmail.com>,
	"hkallweit1@gmail.com" <hkallweit1@gmail.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"corbet@lwn.net" <corbet@lwn.net>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	Leo Li <leoyang.li@nxp.com>,
	Ioana Ciornei <ioana.ciornei@nxp.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net-next 3/9] net: phy: add kr phy connection type
Date: Fri, 27 Mar 2020 12:40:07 +0000
Message-ID: <20200327124007.GJ25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <AM0PR04MB6980E904C03F164E6A1D2267ECCC0@AM0PR04MB6980.eurprd04.prod.outlook.com>

On Fri, Mar 27, 2020 at 12:12:37PM +0000, Madalin Bucur (OSS) wrote:
> > -----Original Message-----
> > From: netdev-owner@vger.kernel.org <netdev-owner@vger.kernel.org> On
> > Behalf Of Russell King - ARM Linux admin
> > Sent: Friday, March 27, 2020 2:02 PM
> > To: Andrew Lunn <andrew@lunn.ch>
> > Cc: Florinel Iordache <florinel.iordache@nxp.com>; davem@davemloft.net;
> > netdev@vger.kernel.org; f.fainelli@gmail.com; hkallweit1@gmail.com;
> > devicetree@vger.kernel.org; linux-doc@vger.kernel.org; robh+dt@kernel.org;
> > mark.rutland@arm.com; kuba@kernel.org; corbet@lwn.net;
> > shawnguo@kernel.org; Leo Li <leoyang.li@nxp.com>; Madalin Bucur (OSS)
> > <madalin.bucur@oss.nxp.com>; Ioana Ciornei <ioana.ciornei@nxp.com>; linux-
> > kernel@vger.kernel.org
> > Subject: Re: [PATCH net-next 3/9] net: phy: add kr phy connection type
> > 
> > On Fri, Mar 27, 2020 at 01:15:15AM +0100, Andrew Lunn wrote:
> > > On Thu, Mar 26, 2020 at 03:51:16PM +0200, Florinel Iordache wrote:
> > > > Add support for backplane kr phy connection types currently available
> > > > (10gbase-kr, 40gbase-kr4) and the required phylink updates (cover all
> > > > the cases for KR modes which are clause 45 compatible to correctly
> > assign
> > > > phy_interface and phylink#supported)
> > > >
> > > > Signed-off-by: Florinel Iordache <florinel.iordache@nxp.com>
> > > > ---
> > > >  drivers/net/phy/phylink.c | 15 ++++++++++++---
> > > >  include/linux/phy.h       |  6 +++++-
> > > >  2 files changed, 17 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> > > > index fed0c59..db1bb87 100644
> > > > --- a/drivers/net/phy/phylink.c
> > > > +++ b/drivers/net/phy/phylink.c
> > > > @@ -4,6 +4,7 @@
> > > >   * technologies such as SFP cages where the PHY is hot-pluggable.
> > > >   *
> > > >   * Copyright (C) 2015 Russell King
> > > > + * Copyright 2020 NXP
> > > >   */
> > > >  #include <linux/ethtool.h>
> > > >  #include <linux/export.h>
> > > > @@ -303,7 +304,6 @@ static int phylink_parse_mode(struct phylink *pl,
> > struct fwnode_handle *fwnode)
> > > >  			break;
> > > >
> > > >  		case PHY_INTERFACE_MODE_USXGMII:
> > > > -		case PHY_INTERFACE_MODE_10GKR:
> > >
> > > We might have a backwards compatibility issue here. If i remember
> > > correctly, there are some boards out in the wild using
> > > PHY_INTERFACE_MODE_10GKR not PHY_INTERFACE_MODE_10GBASER.
> > >
> > > See e0f909bc3a242296da9ccff78277f26d4883a79d
> > >
> > > Russell, what do you say about this?
> > 
> > Yes, and that's a point that I made when I introduced 10GBASER to
> > correct that mistake.  It is way too soon to change this; it will
> > definitely cause regressions:
> > 
> > $ grep 10gbase-kr arch/*/boot/dts -r
> > arch/arm64/boot/dts/marvell/cn9131-db.dts:      phy-mode = "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts:      phy-mode =
> > "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-mcbin.dts:      phy-mode =
> > "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-7040-db.dts:    phy-mode = "10gbase-
> > kr";
> > arch/arm64/boot/dts/marvell/armada-8040-mcbin-singleshot.dts:   phy-mode =
> > "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-mcbin-singleshot.dts:   phy-mode =
> > "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-clearfog-gt-8k.dts:     phy-mode =
> > "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-db.dts: phy-mode = "10gbase-kr";
> > arch/arm64/boot/dts/marvell/armada-8040-db.dts: phy-mode = "10gbase-kr";
> > arch/arm64/boot/dts/marvell/cn9132-db.dts:      phy-mode = "10gbase-kr";
> > arch/arm64/boot/dts/marvell/cn9130-db.dts:      phy-mode = "10gbase-kr";
> > 
> > So any change to the existing PHY_INTERFACE_MODE_10GKR will likely
> > break all these platforms.
> 
> Hi Russell,
> 
> I hoped a fix for those would be in by now, it's not useful to leave them like
> that.

I haven't had the time to address the ones I know about, sorry.
However, there are some platforms in that list which I've no
knowledge of, which I therefore can't change.

> We have a similar situation, where all boards using XFI interfaces contain
> phy-connection-type="xgmii" for a long time now but that did not stop anyone from
> adding a warning in the Aquantia driver:
> 
> +       WARN(phydev->interface == PHY_INTERFACE_MODE_XGMII,
> +            "Your devicetree is out of date, please update it. The AQR107 family doesn't support XGMII, maybe you mean USXGMII.\n");
> +
> 
> Maybe we need a warning added here too, until the proper phy-mode is used for
> these boards, to allow for a transition period.

Adding a warning can only be done once the current users have been
updated, otherwise it's technically introducing a regression.  Plus
some users may actually be correct.  I never did get to the bottom
of that, because that required discussion and no one seems willing
to discuss it.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up

  reply index

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 13:51 [PATCH net-next 0/9] net: ethernet backplane support Florinel Iordache
2020-03-26 13:51 ` [PATCH net-next 1/9] doc: net: add backplane documentation Florinel Iordache
2020-03-26 13:51 ` [PATCH net-next 2/9] dt-bindings: net: add backplane dt bindings Florinel Iordache
2020-03-27  1:04   ` Andrew Lunn
2020-03-27 12:06     ` Russell King - ARM Linux admin
2020-03-27 15:00     ` [EXT] " Florinel Iordache
2020-03-27 15:28       ` Russell King - ARM Linux admin
2020-03-27 15:44         ` Andrew Lunn
2020-03-27 17:35           ` Russell King - ARM Linux admin
2020-03-30  5:43             ` Madalin Bucur (OSS)
2020-03-30 15:39   ` Rob Herring
2020-03-26 13:51 ` [PATCH net-next 3/9] net: phy: add kr phy connection type Florinel Iordache
2020-03-27  0:15   ` Andrew Lunn
2020-03-27 12:01     ` Russell King - ARM Linux admin
2020-03-27 12:12       ` Madalin Bucur (OSS)
2020-03-27 12:40         ` Russell King - ARM Linux admin [this message]
2020-03-29  8:22     ` [EXT] " Florinel Iordache
2020-03-29  9:01       ` Russell King - ARM Linux admin
2020-03-27  0:32   ` Florian Fainelli
2020-03-26 13:51 ` [PATCH net-next 4/9] net: fman: add kr support for dpaa1 mac Florinel Iordache
2020-03-26 13:51 ` [PATCH net-next 5/9] net: dpaa2: add kr support for dpaa2 mac Florinel Iordache
2020-03-26 13:51 ` [PATCH net-next 7/9] net: phy: enable qoriq backplane support Florinel Iordache
2020-03-26 20:03   ` Joe Perches
2020-03-26 20:13     ` Andrew Lunn
2020-03-26 20:27       ` Joe Perches
2020-03-26 13:51 ` [PATCH net-next 8/9] net: phy: add bee algorithm for kr training Florinel Iordache
2020-03-26 13:51 ` [PATCH net-next 9/9] arm64: dts: add serdes and mdio description Florinel Iordache
2020-03-27 12:09   ` Russell King - ARM Linux admin
     [not found] ` <1585230682-24417-7-git-send-email-florinel.iordache@nxp.com>
2020-03-26 18:53   ` [PATCH net-next 6/9] net: phy: add backplane kr driver support David Miller
2020-03-26 18:55     ` Joe Perches
2020-03-26 19:07       ` David Miller
2020-03-26 19:42         ` Joe Perches
2020-03-27  1:07   ` Andrew Lunn
2020-03-27 13:02     ` [EXT] " Florinel Iordache
2020-03-27 13:23       ` Andrew Lunn
2020-03-27 17:43     ` Florian Fainelli
2020-03-27 14:22   ` Andrew Lunn
2020-03-27 18:25     ` Joe Perches
2020-03-27 14:28   ` Andrew Lunn
2020-03-27 14:33   ` Andrew Lunn
2020-03-27 14:38   ` Andrew Lunn

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=20200327124007.GJ25745@shell.armlinux.org.uk \
    --to=linux@armlinux.org.uk \
    --cc=andrew@lunn.ch \
    --cc=corbet@lwn.net \
    --cc=davem@davemloft.net \
    --cc=devicetree@vger.kernel.org \
    --cc=f.fainelli@gmail.com \
    --cc=florinel.iordache@nxp.com \
    --cc=hkallweit1@gmail.com \
    --cc=ioana.ciornei@nxp.com \
    --cc=kuba@kernel.org \
    --cc=leoyang.li@nxp.com \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=madalin.bucur@oss.nxp.com \
    --cc=mark.rutland@arm.com \
    --cc=netdev@vger.kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=shawnguo@kernel.org \
    /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

Linux-Doc Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-doc/0 linux-doc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-doc linux-doc/ https://lore.kernel.org/linux-doc \
		linux-doc@vger.kernel.org
	public-inbox-index linux-doc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-doc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git