netdev - Re: [PATCH] net: mvpp2: add delay at the end of .mac

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Date:   Sun, 1 May 2022 10:23:01 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Baruch Siach <baruch@...s.co.il>
Cc:     Russell King <linux@...linux.org.uk>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: mvpp2: add delay at the end of .mac_prepare

Hi Baruch,

niedz., 1 maj 2022 o 09:57 Baruch Siach <baruch@...s.co.il> napisał(a):
>
> Hi Marcin,
>
> On Thu, Apr 28 2022, Baruch Siach wrote:
> > On Thu, Apr 28 2022, Marcin Wojtas wrote:
> >> I booted MacchiatoBin doubleshot with DT (phy-mode set to "10gbase-r")
> >> without your patch and the 3310 PHY is connected to 1G e1000 card.
> >> After `ifconfig eth0 up` it properly drops to SGMII without any issue
> >> in my setup:
> >>
> >> # ifconfig eth0 up
> >> [   62.006580] mvpp2 f2000000.ethernet eth0: PHY
> >> [f212a600.mdio-mii:00] driver [mv88x3310] (irq=POLL)
> >> [   62.016777] mvpp2 f2000000.ethernet eth0: configuring for phy/sgmii link mode
> >> # [   66.110289] mvpp2 f2000000.ethernet eth0: Link is Up - 1Gbps/Full
> >> - flow control rx/tx
> >> [   66.118270] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> >> # ifconfig eth0 192.168.1.1
> >> # ping 192.168.1.2
> >> PING 192.168.1.2 (192.168.1.2): 56 data bytes
> >> 64 bytes from 192.168.1.2: seq=0 ttl=64 time=0.511 ms
> >> 64 bytes from 192.168.1.2: seq=1 ttl=64 time=0.212 ms
> >
> > This is what I see here:
> >
> > [   46.097184] mvpp2 f2000000.ethernet eth0: PHY [f212a600.mdio-mii:02] driver [mv88x3310] (irq=POLL)
> > [   46.115071] mvpp2 f2000000.ethernet eth0: configuring for phy/10gbase-r link mode
> > [   50.249513] mvpp2 f2000000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
> > [   50.257539] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> >
> > It is almost the same except from the link mode. Why does it try sgmii
> > even before auto-negotiation takes place?
>
> I have now tested on my Macchiatobin, and the issue does not
> reproduce. PHY firmware version here:
>
> [    1.074605] mv88x3310 f212a600.mdio-mii:00: Firmware version 0.2.1.0
>
> But still I see that pl->link_config.interface is initially set to
> PHY_INTERFACE_MODE_10GBASER:
>
> [   13.518118] mvpp2 f2000000.ethernet eth0: configuring for phy/10gbase-r link mode
>
> This is set in phylink_create() based on DT phy-mode. After interface
> down/up sequence pl->link_config.interface matches the 1G wire rate:
>
> [   33.383971] mvpp2 f2000000.ethernet eth0: configuring for phy/sgmii link mode
>
> Do you have any idea where your initial PHY_INTERFACE_MODE_SGMII comes
> from?
>

I have the same behavior, the link configured to 10GBASER and switches
to 1G by linux init scripts. When I do the first ifconfig up, it's
already at SGMII state:

# dmesg | grep eth1
[    2.071753] mvpp2 f2000000.ethernet eth1: Using random mac address
12:27:35:ff:2d:48
[    3.461338] mvpp2 f2000000.ethernet eth1: PHY
[f212a600.mdio-mii:00] driver [mv88x3310] (irq=POLL)
[    3.679714] mvpp2 f2000000.ethernet eth1: configuring for
phy/10gbase-r link mode
[    7.775483] mvpp2 f2000000.ethernet eth1: Link is Up - 1Gbps/Full -
flow control rx/tx
[    7.783455] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[    8.801107] mvpp2 f2000000.ethernet eth1: Link is Down
# ifconfig eth1 up
[   37.498617] mvpp2 f2000000.ethernet eth1: PHY
[f212a600.mdio-mii:00] driver [mv88x3310] (irq=POLL)
[   37.508812] mvpp2 f2000000.ethernet eth1: configuring for phy/sgmii link mode
[   41.598331] mvpp2 f2000000.ethernet eth1: Link is Up - 1Gbps/Full -
flow control rx/tx
[   41.606309] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
#

Best regards,
Marcin