netdev - Re: Unable to TX data on VSC8531

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Date:   Mon, 1 May 2023 13:23:51 -0700
From:   Ron Eggler <ron.eggler@...tywest.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: Unable to TX data on VSC8531

On 5/1/23 13:12, Andrew Lunn wrote:
>> After a fresh rebootI executed:
>>
>> # ping 192.168.1.222 -c 1
>>
>> and see the following:
>>
>> # ifconfig
>> eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500  metric 1
>>          inet 192.168.1.123  netmask 255.255.255.0  broadcast 192.168.1.255
>>          ether be:a8:27:1f:63:6e  txqueuelen 1000  (Ethernet)
>>          RX packets 469  bytes 103447 (101.0 KiB)
>>          RX errors 0  dropped 203  overruns 0  frame 0
>>          TX packets 0  bytes 0 (0.0 B)
>>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>          device interrupt 170
>>
>> eth1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500  metric 1
>>          ether fe:92:66:6c:4e:24  txqueuelen 1000  (Ethernet)
>>          RX packets 0  bytes 0 (0.0 B)
>>          RX errors 0  dropped 0  overruns 0  frame 0
>>          TX packets 0  bytes 0 (0.0 B)
>>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>          device interrupt 173
>>
>> lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536  metric 1
>>          inet 127.0.0.1  netmask 255.0.0.0
>>          loop  txqueuelen 1000  (Local Loopback)
>>          RX packets 1  bytes 112 (112.0 B)
>>          RX errors 0  dropped 0  overruns 0  frame 0
>>          TX packets 1  bytes 112 (112.0 B)
>>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> it appears like the ping got sent to the loopback device instead of the
>> eth0, is this possible?
> It is unlikely. Loopback is used for lots of things. Rather than -c 1,
> leave it running. There should be an arp sent around once a
> second. See if the statistics for lo go up at that rate.
Yes, the TX packets on lo actually do increase every second or so when I 
have a ping running,
it's not 1 packet at a time but rather 3 or 4, it's nnot fully 
consistent, when I scroll back the TX packets on the lo interface 
increased like:

23
26
30
33
37
40

>> I got the following:
>>
>> # mii-tool -vv eth0
>> Using SIOCGMIIPHY=0x8947
>> eth0: negotiated 100baseTx-FD, link ok
>>    registers for MII PHY 0:
>>      1040 796d 0007 0572 01e1 45e1 0007 2801
>>      0000 0300 4000 0000 0000 0000 0000 3000
>>      9000 0000 0008 0000 0000 0000 3201 1000
>>      0000 a020 a000 0000 802d 0021 0400 0000
>>    product info: vendor 00:01:c1, model 23 rev 2
>>    basic mode:   autonegotiation enabled
>>    basic status: autonegotiation complete, link ok
>>    capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD
>> 10baseT-FD 10baseT-HD
>>    advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
>>    link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD
>> 10baseT-FD 10baseT-HD flow-control
> So you have the register values to answer Horatiu question.
Yes, I realized now only that mii-tool provides a pretty output like this.
Thanks for that!
-- 
Ron