Ethernet connection check issue Omega2+

Pavel Negrobov

Hello, guys!
I have found some strange with Omega2+ ethernet link.

At start ethernet cable is disconnected. ubus utility confirms this:

# /bin/ubus call network.interface.wan status
{
        "up": false,
        "pending": true,
        "available": true,
        "autostart": true,
        "dynamic": false,
        "proto": "dhcp",
        "device": "eth0",
        "data": {

        }
}

After ethernet cable connect:
'''

[ 763.914064] rt3050-esw 10110000.esw: link changed 0x01

/bin/ubus call network.interface.wan status

{
"up": true,
"pending": false,
"available": true,
"autostart": true,
"dynamic": false,
"uptime": 7,
"l3_device": "eth0",
"proto": "dhcp",
"device": "eth0",
"updated": [
"addresses",
"routes",
"data"
],
"metric": 0,
"dns_metric": 0,
"delegation": true,
"ipv4-address": [
{
"address": "192.168.1.40",
"mask": 24
..........

All good. Now I disconnect cable and call utility to check network state:

# [  854.682436] rt3050-esw 10110000.esw: link changed 0x00

# [  937.070589] rt3050-esw 10110000.esw: link changed 0x00
# /bin/ubus call network.interface.wan status
{
        "up": true,
        "pending": false,
        "available": true,
        "autostart": true,
        "dynamic": false,
        "uptime": 295,
        "l3_device": "eth0",
        "proto": "dhcp",
        "device": "eth0",
        "updated": [
                "addresses",
                "routes",
                "data"
        ],
        "metric": 0,
        "dns_metric": 0,
        "delegation": true,
        "ipv4-address": [
                {
                        "address": "192.168.1.40",
                        "mask": 24
                }
        ],
...............

# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 40:A3:6B:C1:30:7B
          inet addr:192.168.1.40  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::42a3:6bff:fec1:307b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1101 errors:0 dropped:1 overruns:0 frame:0
          TX packets:306 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:166652 (162.7 KiB)  TX bytes:84785 (82.7 KiB)
          Interrupt:5
Utilities says that I have ethernet connection, but this is wrong!!!
As I can see ethernet kernel driver works correctly, utility fails. After reboot all ok.
How I can to monitor ethernet connection on-the-fly?

Thanks

crispyoz

@Pavel-Negrobov If you monitor ubus (ubus monitor) you will see that disconnecting the cable generates no ubus message.

Usually under Linux you can check the file system /sys/class/net/eth0/operstate but this is also not updated when we use the Warp Core driver. The only way I have found to reliably check link state on the ethernet port is to use the command:

swconfig dev switch0 show

Look at port 0 and you will be able to see the link state is reliably updated.

You can use the command:

swconfig dev switch0 port 0 get link

This will get the status of the ethernet device port 0 which is the one you're interested in.

Lazar Demin

@Pavel-Negrobov you can also try parsing the output of dmesg
This command outputs all kernel messages since boot.

Find the last instance of rt3050-esw 10110000.esw: link changed 0x0* and read the 0 or 1 character at the end to find out if ethernet is connected or not.

Pavel Negrobov

Thanks to all

# [ 1019.154853] rt3050-esw 10110000.esw: link changed 0x00

# swconfig dev switch0 port 0 get link
port:0 link:down

# [ 1047.063981] rt3050-esw 10110000.esw: link changed 0x01
# swconfig dev switch0 port 0 get link
port:0 link:up speed:100baseT full-duplex

This work fine.