netdev - Re: [PATCH net-next v2 3/3] net: phy: marvell10g: place in powersave mode at probe

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Message-ID: <CAGnkfhwedGe4_JAy5Ok7bxYPi_C9bqVWh1fjV6eGy2Ss+-hSag@mail.gmail.com>
Date:   Fri, 10 Apr 2020 18:30:48 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Luka Perkov <luka.perkov@...tura.hr>
Subject: Re: [PATCH net-next v2 3/3] net: phy: marvell10g: place in powersave
 mode at probe

On Fri, Apr 10, 2020 at 6:23 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> On Fri, Apr 10, 2020 at 06:07:46PM +0200, Matteo Croce wrote:
> > On Fri, Apr 10, 2020 at 6:04 PM Russell King - ARM Linux admin
> > <linux@...linux.org.uk> wrote:
> > >
> > > On Fri, Apr 10, 2020 at 05:18:41PM +0200, Matteo Croce wrote:
> > > > On Fri, Apr 10, 2020 at 5:16 PM Russell King - ARM Linux admin
> > > > <linux@...linux.org.uk> wrote:
> > > > >
> > > > > On Fri, Apr 10, 2020 at 04:59:44PM +0200, Matteo Croce wrote:
> > > > > > On Fri, Apr 10, 2020 at 4:50 PM Russell King - ARM Linux admin
> > > > > > <linux@...linux.org.uk> wrote:
> > > > > > >
> > > > > > > On Fri, Apr 10, 2020 at 04:39:48PM +0200, Matteo Croce wrote:
> > > > > > # ./mii-diag eth0 -p 32769
> > > > > > Using the specified MII PHY index 32769.
> > > > > > Basic registers of MII PHY #32769:  2040 0082 002b 09ab 0071 009a c000 0009.
> > > > > >  Basic mode control register 0x2040: Auto-negotiation disabled, with
> > > > > >  Speed fixed at 100 mbps, half-duplex.
> > > > > >  Basic mode status register 0x0082 ... 0082.
> > > > > >    Link status: not established.
> > > > > >    *** Link Jabber! ***
> > > > > >  Your link partner is generating 100baseTx link beat  (no autonegotiation).
> > > > > >    End of basic transceiver information.
> > > > > >
> > > > > > root@...chiatobin:~# ip link show dev eth0
> > > > > > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
> > > > > > mode DEFAULT group default qlen 2048
> > > > > >     link/ether 00:51:82:11:22:00 brd ff:ff:ff:ff:ff:ff
> > > > > >
> > > > > > But no traffic in any direction
> > > > >
> > > > > So you have the same version PHY hardware as I do.
> > > > >
> > > > > So, we need further diagnosis, which isn't possible without a more
> > > > > advanced mii-diag tool - I'm sorting that out now, and will provide
> > > > > a link to a git repo later this afternoon.
> > > > >
> > > >
> > > > Ok, I'll wait for the tool
> > >
> > > Okay, please give this a go:
> > >
> > >         git://git.armlinux.org.uk/~rmk/mii-diag/
> > >
> > > Please send me the full output from:
> > >
> > > # ./mii-diag eth0 -v -p 32768
> > >
> >
> > Hi,
> >
> > here it is:
>
> Thanks.  It seems that the PHY is reporting that everything is fine,
> all the various blocks associated with the SFP+ cage are reporting
> that link is established, and link is established with the host.
>
> I wonder - can you tcpdump to see whether any traffic is being
> received at either end of the link, in case it's only one direction
> that is a problem?
>

Hi,

The problem is in both directions, I can't receive anything, and sent
can't be received from the other end.

# ip -s link show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
mode DEFAULT group default qlen 2048
    link/ether 00:51:82:11:22:00 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast
    0          0        0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    252        6        0       0       0       0

If it can help, I can provide you access to the box.

Regards,
-- 
Matteo Croce
per aspera ad upstream