Cannot get g_ether usbnet working

Hi guys,
I have connected with a USB A/B cable from my LINUX host to my ARM. On my ARM, I have loaded g_ether, usbnet, cdc_subset and mii:
***************************************

# lsmod
Module Size Used by Not tainted
cdc_subset 476 0
usbnet 10470 1 cdc_subset
mii 2872 1 usbnet
g_ether 23528 0
af_packet 15388 2
enc28j60 13992 0
unix 16952 10

********************************************

and have ifconfig'd usb0:

***********************************************
usb0 Link encap:Ethernet HWaddr 4E:72:14:45:30:F9
inet addr:192.168.2.10 Bcast:192.168.2.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
***********************************************

On by LINUX host, I've also loaded g_ether:
************************************************
cytan@ubuntu:/usr/share/wireshark$ lsmod | grep cdc
cdc_ether 13536 0
cdc_subset 12885 0
usbnet 26212 2 cdc_ether,cdc_subset
cytan@ubuntu:/usr/share/wireshark$ lsmod | grep g_ether
g_ether 49416 0
dummy_hcd 23509 1 g_ether

**************************************************

and ifconfig'd usb0 on the LINUX host:

*****************
usb0 Link encap:Ethernet HWaddr c2:25:5f:d4:45:6d
inet addr:192.168.2.5 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::c025:5fff:fed4:456d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:532 errors:0 dropped:0 overruns:0 frame:0
TX packets:433 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:81620 (81.6 KB) TX bytes:87652 (87.6 KB)
********************************

Unfortunately pinging my ARM gadget 192.168.2.10 with my host, there is no route to the gadget. Similarly the other way around. Note: I've also added a default gateway to my ARM: route add default gw 192.168.2.5

I checked that the host is actually seeing the gadget by checking
/sys/kernel/debug/usb/devices

***********************************
T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 12 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS= 8 #Cfgs= 0
P: Vendor=0525 ProdID=a4a2 Rev= 3.12
S: Manufacturer=Linux 2.6.39.4 with s3c2410_udc
S: Product=RNDIS/Ethernet Gadget
*************************************

And so the LINUX host does see my ARM gadget.

Is there something else I need to do to get my gadget recognized by the LINUX host so that I can ping it and get usbnet working?

Thanks!

cytan

What does the route cache show in the linux side or from the ARM?

--# route -n

or

--# netstat -r

See that the route i-faces point to your g_ether.

Since it is RNDIS enabled, have you read this already? What linux kernel are you running?

Hi malek,
Unbelievable, my 3.5 month old ASUS just had a hard drive crash! Fortunately, I actually have backup of the linux partition before the drive complete gave out. But I don't have a LINUX box to run my ARM cross compiler right now and will only have it when I RMA the ASUS.

However, just for your info my ARM is running LINUX 2.6.39.4 and the host is running UBUNTU 11.10.

Reading from your link about rndis, do I actually need a USB hub between my ARM and my LINUX host? Is a simple USB A/B cable is not sufficient?

Also another interesting observation is that running ethtool on the ARM gives "LINK: no". Any thoughts?

Another interesting data point: I connected the ARM to my MacBook Pro and ran ethtool on the ARM and I get a Link: yes! Unfortunately, I don't think there is RNDIS available on the Mac. Any words of wisdom?

I don't know why usbnet is not working on my LINUX box (it's still being repaired). BUT usbnet works without any changes on WinXP with linux.inf driver from http://code.google.com/p/beagleboard...name=linux.inf loaded.

On Mac OSX, it required the AJZaurusUSB driver from http://projects.goldelico.com/p/AJZaurusUSB/ and then modifying its info.plist file to add the linux product id and vendor id's. (idProduct is 4216 and idVendor is 1317, See http://docwiki.gumstix.org/index.php/Setting_up_USBnet for modification instructions) Then most importantly, g_ether *must* be loaded with the parameter

modprobe g_ether use_eem=0

to disable RNDIS because Mac OSX does not support RNDIS.

I'll have to wait for my LINUX box to be repaired before I can test usbnet with it.

I hope the above info is useful for others.

OK, I got my Ubuntu box back and it also requires use_eem=0 for the gadget to be recognized. It shows up as a USB2 device and needs to be configured using system setup-> network. For some reason using ifconfig on the command line is not sufficient because it keeps getting reset, i.e. gets disconnected on the Ubuntu box.