[etherlab-users] Problem at unplug and reconnection of network cable with Etherlab master patchset 20190904

Fri Apr 17 01:40:14 CEST 2020

The udev rule is intended for motherboards with onboard e1000e only, due to an adverse interaction between the MEI power-saving and E1000E.  I don't think it will help with add-in cards - but then, in my testing none of the add-in cards that I had were affected by the issue either, since they shouldn't be interacting with the MEI.

As noted in the docs, restarting the ethercat service (thereby reloading the driver) should also recover from the fault, though obviously that's not an acceptable workaround in practice.

The good news is that (if it's the same issue) if you switch to the generic driver then the problem should go away.  The bad news is that this may limit your real-time performance.  Another option is to drop back to Debian 8, or at least a pre-4.4 Linux kernel.

Gavin Lambert
Senior Software Developer

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From: BUSSIERES Vincent
Sent: Friday, 17 April 2020 11:23
To: etherlab-users at etherlab.org
Subject: [etherlab-users] Problem at unplug and reconnection of network cable with Etherlab master patchset 20190904

Dear Etherlab users,

I am developing a software using Etherlab master patchset 20190904 for recent kernels.
My environment is Linux Debian 9.5 with 4.9.0-8-amd64 kernel. I am using a add-in network card, Kernel driver in use is ec_e100e.
I connect only one slave to the master.

I noticed strange behaviours when I unplug and reconnect network cable. First times everythings is OK, I can see state link jump from up to down and down to up, communication resumes.
But sometimes my software doesn't respond neither ethercat tools. Communication is break down, command etherlab master doesn't work too.
I must reboot computer to make it works again.

As advised in the patch documentation, I add a rule with the following content : ACTION=="add",KERNEL=="mei0",ATTR{../../power/control}="on" but that didn't solve the problem.

I didn't notice something wrong in dmesg log below.

[  171.720209] EtherCAT DEBUG: 0C D1 00 00 00 00 1D 00 00 00 00 00 00 00 00 00
[  171.720214] EtherCAT DEBUG: 00 00 00 00 00 00 0F 00 00 00 00 00 00 00 00 00
[  171.720218] EtherCAT DEBUG: 00 08 00 38 C0 37 06 00 00 00 00 00
[  171.721186] EtherCAT DEBUG 0: Datagram ffff8cb3d35a93d8 already queued (skipping).
[  171.721187] EtherCAT DEBUG 0: ec_master_send_datagrams(device_index = 0)
[  171.721187] EtherCAT DEBUG 0: Adding datagram 0xD2
[  171.721188] EtherCAT DEBUG 0: frame size: 46
[  171.721188] EtherCAT DEBUG 0: Sending frame:
[  171.721188] EtherCAT DEBUG: FF FF FF FF FF FF 68 05 CA 8B CE EB 88 A4 29 10
[  171.721192] EtherCAT DEBUG: 0C D2 00 00 00 00 1D 00 00 00 00 00 00 00 00 00
[  171.721196] EtherCAT DEBUG: 00 00 00 00 00 00 0F 00 00 00 00 00 00 00 00 00
[  171.721200] EtherCAT DEBUG: 00 08 00 38 C0 37 06 00 00 00 00 00
[  171.722184] EtherCAT DEBUG 0: Datagram ffff8cb3d35a93d8 already queued (skipping).
[  171.722185] EtherCAT DEBUG 0: ec_master_send_datagrams(device_index = 0)
[  171.722185] EtherCAT DEBUG 0: Adding datagram 0xD3
[  171.722186] EtherCAT DEBUG 0: frame size: 46
[  171.722186] EtherCAT DEBUG 0: Sending frame:
[  171.722186] EtherCAT DEBUG: FF FF FF FF FF FF 68 05 CA 8B CE EB 88 A4 29 10
[  171.722190] EtherCAT DEBUG: 0C D3 00 00 00 00 1D 00 00 00 00 00 00 00 00 00
[  171.722194] EtherCAT DEBUG: 00 00 00 00 00 00 0F 00 00 00 00 00 00 00 00 00
[  171.722198] EtherCAT DEBUG: 00 08 00 38 C0 37 06 00 00 00 00 00
[  171.723188] EtherCAT DEBUG 0: Datagram ffff8cb3d35a93d8 already queued (skipping).
[  171.723189] EtherCAT DEBUG 0: ec_master_send_datagrams(device_index = 0)
[  171.723189] EtherCAT DEBUG 0: Adding datagram 0xD4
[  171.723190] EtherCAT DEBUG 0: frame size: 46
[  171.723190] EtherCAT DEBUG 0: Sending frame:
[  171.723190] EtherCAT DEBUG: FF FF FF FF FF FF 68 05 CA 8B CE EB 88 A4 29 10
[  171.723194] EtherCAT DEBUG: 0C D4 00 00 00 00 1D 00 00 00 00 00 00 00 00 00
[  171.723198] EtherCAT DEBUG: 00 00 00 00 00 00 0F 00 00 00 00 00 00 00 00 00
[  171.723202] EtherCAT DEBUG: 00 08 00 38 C0 37 06 00 00 00 00 00
[  171.723898] EtherCAT 0: 0 slave(s) responding on main device.
[  171.723899] EtherCAT 0: Stopping EoE thread.

Does anybody has got an idea ? Thanks a lot.

Best regards

Vincent BUSSIERES
Responsable Technique Logiciel

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