netdev - Re: Marvell switch port shows LOWERLAYERDOWN, ping fails

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Message-ID: <59790fef-bf4a-17e5-4927-5f8d8a1645f7@helixd.com>
Date:   Wed, 28 Jul 2021 11:33:35 -0700
From:   Dario Alcocer <dalcocer@...ixd.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: Marvell switch port shows LOWERLAYERDOWN, ping fails

On 7/28/21 11:23 AM, Andrew Lunn wrote:
> On Wed, Jul 28, 2021 at 11:07:37AM -0700, Dario Alcocer wrote:
>> It appears the port link-state issue is caused by the mv88e6xxx switch
>> driver. The function mv88e6xxx_mac_config identifies the PHY as internal and
>> skips the call to mv88e6xxx_port_setup_mac.
>>
>> It does not make sense to me why internal PHY configuration should be
>> skipped.
> 
> The switch should do the configuration itself for internal PHYs. At
> least that works for other switches. What value does CMODE have for
> the port? 0xf?
> 
>      Andrew
> 

Is CMODE available via the DSA debugfs? Here are the registers for 
port0, which should be lan1:

root@...i:~# ls /sys/kernel/debug/dsa/switch0/
port0/        port1/        port2/        port3/        port4/ 
port5/        port6/        tag_protocol  tree
root@...i:~# ls /sys/kernel/debug/dsa/switch0/port0/
fdb    mdb    regs   stats  vlan
root@...i:~# cat /sys/kernel/debug/dsa/switch0/port0/regs
  0: 100f
  1: 0003
  2: 0000
  3: 1761
  4: 0433
  5: 0000
  6: 0010
  7: 0000
  8: 2080
  9: 0001
10: 0000
11: 0001
12: 0000
13: 0000
14: 0000
15: 9100
16: 0000
17: 0000
18: 0000
19: 0000
20: 0000
21: 0000
22: 0033
23: 0000
24: 3210
25: 7654
26: 0000
27: 8000
28: 0000
29: 0000
30: 0000
31: 0000
root@...i:~#