linux-kernel - Re: [PATCH v3 0/2] net: mvmdio: avoid error message for optional IRQ

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Date:   Wed, 8 Apr 2020 01:44:58 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     "mcroce@...hat.com" <mcroce@...hat.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "josua@...id-run.com" <josua@...id-run.com>,
        "luka.perkov@...tura.hr" <luka.perkov@...tura.hr>
Subject: Re: [PATCH v3 0/2] net: mvmdio: avoid error message for optional IRQ

Hi Matteo,

On Wed, 2020-04-08 at 03:19 +0200, Matteo Croce wrote:
> On Mon, 16 Mar 2020 20:49:05 +1300
> Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:
> 
> > I've gone ahead an sent a revert. This is the same as the original
> > v1
> > except I've added Andrew's review to the commit message.
> > 
> > Chris Packham (2):
> >   Revert "net: mvmdio: avoid error message for optional IRQ"
> >   net: mvmdio: avoid error message for optional IRQ
> > 
> >  drivers/net/ethernet/marvell/mvmdio.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> 
> Hi all,
> 
> I have a Macchiatobin board and the 10G port stopped working in net-
> next.
> I suspect that these two patches could be involved.
> The phy is correctly detected now (I mean no errors and the device is
> registered) but no traffic can be sent or received:
> 
> root@...chiatobin:~# dmesg |grep -i -e phy -e mvpp2
> [    0.000000] Booting Linux on physical CPU 0x0000000000
> [0x410fd081]
> [    0.000000] arch_timer: cp15 timer(s) running at 25.00MHz (phys).
> [    0.062798] libphy: Fixed MDIO Bus: probed
> [    1.132552] armada8k-pcie f2600000.pcie: Phy link never came up
> [    2.553464] libphy: orion_mdio_bus: probed
> [    2.558045] libphy: orion_mdio_bus: probed
> [    2.564037] mvpp2 f2000000.ethernet: using 8 per-cpu buffers
> [    2.588754] mvpp2 f2000000.ethernet eth0: Using random mac address
> 1e:a6:ce:39:8d:22
> [    2.599980] mvpp2 f4000000.ethernet: using 8 per-cpu buffers
> [    2.623293] mvpp2 f4000000.ethernet eth1: Using random mac address
> aa:ad:b5:91:8c:1e
> [    2.626535] mvpp2 f4000000.ethernet eth2: Using random mac address
> 6e:39:fb:74:09:6e
> [    2.629600] mvpp2 f4000000.ethernet eth3: Using random mac address
> 16:ec:bf:9e:11:0f
> [    2.952063] mvpp2 f4000000.ethernet eth2: PHY [f212a200.mdio-
> mii:00] driver [Marvell 88E1510] (irq=POLL)
> [    2.953251] mvpp2 f4000000.ethernet eth2: configuring for
> phy/sgmii link mode
> [    7.122899] mvpp2 f4000000.ethernet eth2: Link is Up - 1Gbps/Full
> - flow control rx/tx
> [   25.727756] mvpp2 f2000000.ethernet eth0: PHY [f212a600.mdio-
> mii:00] driver [mv88x3310] (irq=POLL)
> [   25.746711] mvpp2 f2000000.ethernet eth0: configuring for
> phy/10gbase-r link mode
> [   27.842712] mvpp2 f2000000.ethernet eth0: Link is Up - 10Gbps/Full
> - flow control off
> 
> 
> The only way to have it working is to unplug the power, boot an old
> kernel, e.g. 5.3.0:
> 
> root@...chiatobin:~# dmesg |grep -i -e phy -e mvpp2
> [    0.000000] Booting Linux on physical CPU 0x0000000000
> [0x410fd081]
> [    0.000000] arch_timer: cp15 timer(s) running at 25.00MHz (phys).
> [    0.083647] libphy: Fixed MDIO Bus: probed
> [    0.152788] armada8k-pcie f2600000.pcie: Failed to initialize
> PHY(s) (-22)
> [    1.429643] libphy: orion_mdio_bus: probed
> [    1.439109] libphy: orion_mdio_bus: probed
> [    1.450989] mvpp2 f2000000.ethernet eth0: Using random mac address
> 5a:09:5f:97:aa:cc
> [    1.476692] mvpp2 f4000000.ethernet eth1: Using random mac address
> f2:e2:c1:77:fa:23
> [    1.479688] mvpp2 f4000000.ethernet eth2: Using random mac address
> b2:33:c0:2f:da:ba
> [    1.482296] mvpp2 f4000000.ethernet eth3: Using random mac address
> 6a:38:79:2e:96:8c
> [    1.814163] mvpp2 f4000000.ethernet eth2: PHY [f212a200.mdio-
> mii:00] driver [Marvell 88E1510]
> [    1.814170] mvpp2 f4000000.ethernet eth2: phy: setting supported
> 00,00000000,000066ef advertising 00,00000000,000066ef
> [    1.826025] mvpp2 f4000000.ethernet eth2: configuring for
> phy/sgmii link mode
> [    1.826030] mvpp2 f4000000.ethernet eth2: phylink_mac_config:
> mode=phy/sgmii/Unknown/Unknown adv=00,00000000,000066ef pause=10
> link=0 an=1
> [    1.827683] mvpp2 f4000000.ethernet eth2: phy link down
> sgmii/1Gbps/Half
> [    6.002304] mvpp2 f4000000.ethernet eth2: phy link up
> sgmii/1Gbps/Full
> [    6.002313] mvpp2 f4000000.ethernet eth2: phylink_mac_config:
> mode=phy/sgmii/1Gbps/Full adv=00,00000000,00000000 pause=0f link=1
> an=0
> [    6.002332] mvpp2 f4000000.ethernet eth2: Link is Up - 1Gbps/Full
> - flow control rx/tx
> [   33.186689] mvpp2 f2000000.ethernet eth0: PHY [f212a600.mdio-
> mii:00] driver [mv88x3310]
> [   33.194739] mvpp2 f2000000.ethernet eth0: phy: setting supported
> 00,00008000,0000706f advertising 00,00008000,0000706f
> [   33.218029] mvpp2 f2000000.ethernet eth0: configuring for
> phy/10gbase-kr link mode
> [   33.225637] mvpp2 f2000000.ethernet eth0: phylink_mac_config:
> mode=phy/10gbase-kr/Unknown/Unknown adv=00,00008000,0000706f pause=10
> link=0 an=1
> [   33.241341] mvpp2 f2000000.ethernet eth0: phy link down 10gbase-
> kr/Unknown/Unknown
> [   35.362160] mvpp2 f2000000.ethernet eth0: phy link up 10gbase-
> kr/10Gbps/Full
> [   35.369243] mvpp2 f2000000.ethernet eth0: phylink_mac_config:
> mode=phy/10gbase-kr/10Gbps/Full adv=00,00000000,00000000 pause=00
> link=1 an=0
> [   35.381836] mvpp2 f2000000.ethernet eth0: Link is Up - 10Gbps/Full
> - flow control off
> 
> 
> And then do a soft reboot to net-next which works.
> By rebooting the board multiple times it works, until I unplug the
> power.
> 
> Any hint?
> Bye,
> 

Well certainly the first change that got applied commit e1f550dc44a4
("net: mvmdio: avoid error message for optional IRQ") would cause a
problem. But the revert and the corrected change commit fa2632f74e57
("net: mvmdio: avoid error message for optional IRQ") should result in
no behaviour changing (other than the spurious log message.

There is a pre-existing problem that any error other than -EPROBE_DEFER
will be silently ignored (that was what the initial attempt was trying
to handle but got it wrong). So there could be an error that might be
trying to tell you that something went wrong.