netdev - Re: Unable to TX data on VSC8531

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Date:   Sun, 30 Apr 2023 16:23:21 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ron Eggler <ron.eggler@...tywest.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Unable to TX data on VSC8531

On Sun, Apr 30, 2023 at 07:08:21AM -0700, Ron Eggler wrote:
> Hi,
> 
> I've posted here previously about the bring up of two network interfaces on
> an embedded platform that is using two the Microsemi VSC8531 PHYs. (previous
> thread: issues to bring up two VSC8531 PHYs, Thanks to Heiner Kallweit &
> Andrew Lunn).
> I'm able to seemingly fully access & operate the network interfaces through
> ifconfig (and the ip commands) and I set the ip address to match my /24
> network. However, while it looks like I can receive & see traffic on the
> line with tcpdump

So receive definitely works?

It is a long shot, but a couple of decades ago, i had a board where
the PHY came up in loopback mode. All transmits never went out the
cable, they just came straight back again.

When running tcpdump during transmit, do you see each packet twice?

Please run mii-tool on the interface. e.g. for my device:

mii-tool -vv enp2s0:
Using SIOCGMIIPHY=0x8947
enp2s0:: no link
  registers for MII PHY 0: 
    1040 79c9 001c c800 0de1 0000 0064 0000
    0000 0200 0000 0000 0000 0000 0000 2000
    0000 0000 ffff 0000 0000 0400 0f00 0f00
    319b 0053 1002 80d9 84ca 0000 0000 0000
  product info: vendor 00:e0:4c or 00:07:32, model 0 rev 0
  basic mode:   autonegotiation enabled
  basic status: no link
  capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control


	Andrew