Re: [Xenomai] rtnet/xenomai-3.0.1+3.18.20kernel: tdma & nomac issue

[Thierry Grandpierre <thierry.grandpierre@esiee.fr>]

Thanks for a so fast answer!


Le 06/03/2016 16:08, Gilles Chanteperdrix a écrit :
> On Sun, Mar 06, 2016 at 03:36:49PM +0100, Thierry Grandpierre wrote:
>> 1) RTNET/TDMA : I am unsuccessfully  trying to run rtnet/xenomai 3 on 2
>> virtual machines : a VM as master and a VM as slave. Synchro frames are
>> sent by the master and received on the slave machine (seen with
>> wireshark on the rteth0 of each machine) but slave never answer. Both
>> machine are VMs connected by a  VM to VM private network  (VMnet0 in
>> VMware)
> Are you sure the network emulation you use transmit all kinds of
> packets? In qemu, for instance, the default network emulation is not
> able to transmit icmp packets and probably not rtcfg packets (they
> use a custom ethertype). I have tested rtcfg with Xenomai 3.0.1 and
> it worked. I have not tried transmitting files though, just used it
> as a kind of DHCP.
I use VMware Workstation 11.0.0 build-2305329 and setup vm0 as a 
Host-only (connect VMs internally in a private network) without 
connecting any host virtual adapter to this network neither DHCP.

As explained, using wireshark on the second VM I saw the sync frame sent 
by the first VM so I think that yes the packets seems to be transmitted :
wireshark on the master : 100    0.494738000    Vmware_cc:8c:1b 
Broadcast    TDMA    42 Synchronisation
wireshark on the slave : 204    0.484035000    Vmware_cc:8c:1b 
Broadcast    TDMA    64 Synchronisation

==> the strange thing is the size difference 42 on the master versus 64 
received on the slave...22 bytes difference
I will try to get more info. on that..


>
>> Rtnet on the slave machine is waiting with message :
>>       /usr/xenomai/sbin/rtcfg rteth0 add 10.0.0.2 -stage1 -
>>       Waiting for all slaves.../usr/xenomai/sbin/rtcfg rteth0 wait"
>>
>> Rtnet on the master machine is also hanging with message
>>     /usr/xenomai/sbin/rtifconfig rteth0 up 10.0.0.2
>>     Stage 1: searching for master...
>>
>> I think rtnet on the slave machine doesn't see/understand the sync
>> frames. Below all details are given.
>>
>> 2)RTNET/NOMAC:
>> When trying nomac, once everything is configured, I'm getting " ioctl:
>> Resource temporarily unavailable" when pinging. Details are also given
>> at the end.
> This probably means that the network is not up, but I am a little
> confused, as I thought I added this check after the 3.0.1 release.
> Are you using the 3.0.1 release, or the current git?
> Anyway, if that is the case, when you run rtifconfig you should not
> see the RUNNING flag. You have to wait for the network to be up and
> running before being able to actually send packets.
>
I used the 3.0.1 release, not the git version.

How can I disable this RUNNING flag (I thought is was normal to have 
running..) ?  it never goes off by itself :-(

esiee@ubuntu:~$ sudo /usr/xenomai/sbin/rtifconfig rteth0 up
esiee@ubuntu:~$ sudo /usr/xenomai/sbin/rtifconfig rteth0
rteth0    Medium: Ethernet  Hardware address: 00:0C:29:A5:4D:5C
           IP address: 10.0.0.2  Broadcast address: 10.0.0.255
           UP BROADCAST RUNNING  MTU: 1500

Many thanks,
Thierry