RTNet - vnic0 question

Laurentiu-Cristian Duca laurentiu.duca at gmail.com
Thu Aug 22 13:21:32 CEST 2019


Hi,

  I have made a test between two qemu-x86_64-rt_8139too with different
mac and IP addresses,
one is master one is slave. In each of them I do:
/usr/xenomai/sbin/rtnet start
Then the applications rtt-sender and rtt-responder (taken from rtnet
0.9.13 release) work,
but if I turn off vnic0, then rtt-sender reports error: "sendto
failed: Network is unreachable",
even if rteth0 is up and fully configured.
  Do you have any simple apps that work on rtnet?

Thank you,
Kind regards

On 8/22/19, Laurentiu-Cristian Duca <laurentiu.duca at gmail.com> wrote:
> The rt drivers for bbb are taken from:
> https://github.com/G-Ray/xenomai-boneblack-rtnet-drivers
> and I am not 100% sure that they are working correctly.
>
> On 8/22/19, Laurentiu-Cristian Duca <laurentiu.duca at gmail.com> wrote:
>> Hello Jan and friends
>>
>>   Thank you for your fast answer. Please find below the details.
>>
>> On 8/21/19, Jan Kiszka <jan.kiszka at siemens.com> wrote:
>>> On 21.08.19 16:20, Laurentiu-Cristian Duca via Xenomai wrote:
>>>> Hello rtnet community,
>>>>
>>>>    I successfully tested the examples rtt-sender and rtt-responder
>>>> within a rtnet made from one beaglebone black and one
>>>> qemu-x86_64-8139too,
>>>> with tdma and also with nomac.
>>>
>>> Are we talking about some legacy Xenomai or even RTnet version? Or where
>>> did
>>> you
>>> get the examples from? They are not part of RTnet in Xenomai 3.
>>>
>>   I got the examples from rtnet-0.9.13. I know they are quite old, but
>> I needed a start point.
>> Are these obsolete? Do you have any examples for Xenomai 3?
>> rtnet-0.9.13/examples/xenomai/posix/rtt-sender.c
>> rtnet-0.9.13/examples/xenomai/posix/rtt-responder.c
>>
>>>>
>>>>    I have noted that the presence of vnic0 as an up and fully
>>>> configured interface is mandatory,
>>>> even if rteth0 is up and fully configured.
>>>> Otherwise the rtt-sender announces "sendto failed: Network is
>>>> unreachable".
>>>> Could anybody tell me why is this happening?
>>>>
>>>>    I have also noted that if I disable vnic0 (ifconfig vnic0 down),
>>>> rtping works if rteth0 is up and fully configured.
>>>> Why does not work rtt-sender in this case?
>>>> Could it be a problem with rtnet drivers?
>>>
>>> I bet your examples are falling back to normal network here, and that is
>>> provided between your test nodes via the vnics. This leads to my first
>>> question:
>>> Where did you pick the examples up, how did you build them etc.? Also,
>>> did
>>> you
>>> make sure that rtudp was loaded?
>>
>>    I am 100% sure that rtudp was loaded. The modules were loaded by a
>> script:
>> modprobe rt_smsc && modprobe rt_davinci_mdio && modprobe rt_ticpsw
>> modprobe rtipv4 && modprobe rtpacket && modprobe rtudp
>> modprobe rtmac
>> modprobe nomac
>> #modprobe tdma
>>
>>   I used robertcnelson Xenomai 3.0.9 patch for beaglebone black linux
>> 4.14.108. It's on github.
>> I have also copied the rtnet header files to xenomai-userspace
>> include. The files compile without warnings.
>> The makefile is:
>> # Tested with linaro toolchain
>> (gcc-linaro-7.4.1-2019.02-x86_64_arm-linux-gnueabihf)
>> CC = arm-linux-gnueabihf-gcc
>> XENO_INSTALL =
>> /home/laur/lucru/raspberry-pi/robertcnelson/ti-linux-kernel-dev/ignore/xenomai-userspace
>> RTNET_INSTALL =
>> /home/laur/lucru/raspberry-pi/robertcnelson/rtnet-hiddeate2m
>>
>> #XENO_CONFIG :=
>> /home/laur/lucru/raspberry-pi/robertcnelson/ti-linux-kernel-dev/ignore/xenomai-userspace/usr/xenomai/bin/xeno-config
>> #/usr/xenomai/bin/xeno-config
>> #CFLAGS := $(shell $(XENO_CONFIG)   --posix --alchemy --cflags)
>> #LDFLAGS := $(shell $(XENO_CONFIG)  --posix --alchemy --ldflags)
>>
>> LIBCFLAGS = -Wall -I$(XENO_INSTALL)/usr/xenomai/include/cobalt
>> LIBCFLAGS += -I$(XENO_INSTALL)/usr/xenomai/include
>>
>> CFLAGS = -Wall -I$(XENO_INSTALL)/usr/xenomai/include/cobalt
>> CFLAGS += -I$(XENO_INSTALL)/usr/xenomai/include/alchemy
>> -I$(XENO_INSTALL)/usr/xenomai/include
>> CFLAGS += -march=armv7-a -mfpu=vfpv4 -D_GNU_SOURCE -D_REENTRANT
>> -D__COBALT__ -D__COBALT_WRAP_
>> CFLAGS += -I$(RTNET_INSTALL)/stack/include
>>
>> LFLAGS = -lalchemy -lcopperplate
>> $(XENO_INSTALL)/usr/xenomai/lib/xenomai/bootstrap.o
>> LFLAGS += -Wl,--wrap=main -Wl,--wrap=malloc -Wl,--wrap=free
>> #-Wl,--dynamic-list=$(XENO_INSTALL)/usr/xenomai/lib/dynlist.ld
>> LFLAGS += -L$(XENO_INSTALL)/usr/xenomai/lib -lcobalt -lpthread -lrt
>> LFLAGS +=  -march=armv7-a -mfpu=vfpv4 -Llib
>>
>> all: rtt-sender rtt-responder
>> rtt-sender: rtt-sender.o
>> 	$(CC) -o rtt-sender rtt-sender.o $(LFLAGS)
>> rtt-sender.o: rtt-sender.c
>> 	$(CC) -c -o rtt-sender.o rtt-sender.c $(CFLAGS) $(LIBCFLAGS)
>> (same for rtt-responder)
>>
>>
>> Kind regards,
>> L-C.
>>
>



More information about the Xenomai mailing list