RTNet - vnic0 question

Laurentiu-Cristian Duca laurentiu.duca at gmail.com
Thu Aug 22 09:54:38 CEST 2019


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.
>



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