linux-kernel - Re: [PATCH v2] lan743x: add virtual PHY for PHY-less devices

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Date:   Mon, 25 Jan 2021 11:57:47 +0300
From:   Sergej Bauer <sbauer@...ckbox.su>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Simon Horman <simon.horman@...ronome.com>,
        Mark Einon <mark.einon@...il.com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] lan743x: add virtual PHY for PHY-less devices

On Saturday, January 23, 2021 4:32:38 AM MSK Andrew Lunn wrote:
> > it migth be helpful for developers work on userspace networking tools with
> > PHY-less lan743x
> 
> (the interface even could not be brought up)
> 
> > of course, there nothing much to do without TP port but the difference is
> > representative.
> > 
> > sbauer@...amini ~$ sudo ethtool eth7
> > Settings for eth7:
> > Cannot get device settings: No such device
> > 
> >         Supports Wake-on: pumbag
> >         Wake-on: d
> >         Current message level: 0x00000137 (311)
> >         
> >                                drv probe link ifdown ifup tx_queued
> >         
> >         Link detected: no
> > 
> > sbauer@...amini ~$ sudo ifup eth7
> > sbauer@...amini ~$ sudo ethtool eth7
> > 
> > Settings for eth7:
> >         Supported ports: [ MII ]
> >         Supported link modes:   10baseT/Full
> >         
> >                                 100baseT/Full
> >                                 1000baseT/Full
> >         
> >         Supported pause frame use: Symmetric Receive-only
> >         Supports auto-negotiation: Yes
> >         Supported FEC modes: Not reported
> >         Advertised link modes:  10baseT/Full
> >         
> >                                 100baseT/Full
> >                                 1000baseT/Full
> >         
> >         Advertised pause frame use: Symmetric Receive-only
> >         Advertised auto-negotiation: Yes
> >         Advertised FEC modes: Not reported
> >         Speed: 1000Mb/s
> >         Duplex: Full
> >         Port: MII
> >         PHYAD: 0
> >         Transceiver: internal
> >         Auto-negotiation: on
> >         Supports Wake-on: pumbag
> >         Wake-on: d
> >         Current message level: 0x00000137 (311)
> >         
> >                                drv probe link ifdown ifup tx_queued
> >         
> >         Link detected: yes
> > 
> > sbauer@...amini ~$ sudo mii-tool -vv eth7
> > Using SIOCGMIIPHY=0x8947
> > eth7: negotiated 1000baseT-FD, link ok
> > 
> >   registers for MII PHY 0:
> >     5140 512d 7431 0011 4140 4140 000d 0000
> >     0000 0200 7800 0000 0000 0000 0000 2000
> >     0000 0000 0000 0000 0000 0000 0000 0000
> >     0000 0000 0000 0000 0000 0000 0000 0000
> >   
> >   product info: vendor 1d:0c:40, model 1 rev 1
> >   basic mode:   loopback, autonegotiation enabled
> >   basic status: autonegotiation complete, link ok
> >   capabilities: 1000baseT-FD 100baseTx-FD 10baseT-FD
> >   advertising:  1000baseT-FD 100baseTx-FD 10baseT-FD
> >   link partner: 1000baseT-FD 100baseTx-FD 10baseT-FD
> 
> You have not shown anything i cannot do with the ethernet interfaces i
> have in my laptop. And since ethtool is pretty standardized, what
> lan743x offers should be pretty much the same as any 1G Ethernet MAC
> using most 1G PHYs.
> 
>       Andrew

Andrew, for this moment with lan743x we can get only this:
sbauer@...amini ~/devel/kernel-works/net-next.git master$ sudo ethtool eth7
Settings for eth7:
Cannot get device settings: No such device
        Supports Wake-on: pumbag
        Wake-on: d
        Current message level: 0x00000137 (311)
                               drv probe link ifdown ifup tx_queued
        Link detected: no
sbauer@...amini ~/devel/kernel-works/net-next.git master$ sudo mii-tool -vv 
eth7
Using SIOCGMIIPHY=0x8947
SIOCGMIIPHY on 'eth7' failed: Invalid argument


-- 
                                Regards,
                                    Sergej.