Problem receiving muliticast messages on ARM device
- From: Sandro Stiller <sandro.stiller@xxxxxxxxxxxx>
- Date: Wed, 27 Jun 2012 12:41:24 +0000 (UTC)
I have a problem receiving multicast streams on an ARM device
(Beagleboard XM) with a smsc9514 network device.
If I start the kernel using a nfs root, my live555 based software can
receive multicast streams. If I start from SD card, multicast doesn't
work.
I also tried the multicast example software from
http://www.nmsl.cs.ucsb.edu/MulticastSocketsBook/#cexamples
Same problem here.
The kernel is the same (linux-2.6.32-omap-psp), loaded from SD card
with u-boot.
/proc/net/dev_mcast and "netstat -g" show the same info if I start
my software in both cases.
The file system (nfs and SD card) are identical.
In both cases I set the multicast route with
"route add -net 224.0.0.0 netmask 240.0.0.0 dev usb0"
(usb0 is the network device.) and I also call
"sysctl -w net.core.rmem_max=8388608"
The kernel command lines are (sd root, not working):
# cat /proc/cmdline
console=tty0 console=ttyS2,115200n8 camera=tvp5146 mem=80M@0x80000000
mem=384M@0x88000000 noinitrd rw mpurate=1000 buddy=none vram=16M
omapfb.mode=dvi:800x600MR-32@50 omapdss.def_disp=dvi
ip=10.0.0.55:10.0.0.152::255.0.0.0::: root=/dev/mmcblk0p2 rootfstype=ext3
rw rootflags=data=journal,errors=remount-ro rootwait
working device (nfs root):
# cat /proc/cmdline
console=tty0 console=ttyS2,115200n8 camera=tvp5146 mem=80M@0x80000000
mem=384M@0x88000000 noinitrd rw mpurate=1000 buddy=none vram=16M
omapfb.mode=dvi:800x600MR-32@50 omapdss.def_disp=dvi
ip=10.0.0.55:10.0.0.152::255.0.0.0::: root=/dev/nfs
nfsroot=10.0.0.152:/home/stiller/development/OMAP/root/XM,nolock
rootdelay=3
I added the ip parameter in the first cmdline just to test if
this parameter has any effect to the multicast problem.
I can receive the multicast messages with tcpdump (both cases).
If I add another usb->ethernet device (moschip instead of smsc) while the
device runs, I still can not receive multicast with new new interface.
If I start with nfs, the new interface works, too.
So it seems not to be a problem with the network device driver.
I can not try another kernel version because I added a lot of patches for
our connected hardware.
Multicast is enabled in the kernel .config.
The MULTICAST flag is set if I call "ifconfig usb0"
Setting "allmulti" and "promisc" in the network interfaces doesn't help.
On the not working device /proc/sys/net/ipv4/conf/all/rp_filter was
set to 1 on start, but setting to 0 doesn't help.
Any idea?
Sandro
.
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