[Qemu-devel] CDC ethernet device support

["Blnchet-Momas Frédéric" <blanchet@b2i-toulouse.com>]

Hello list

  "Sorry if you receive double post, I don't be sure you reveived the
intial post. "

  We would use qemu and a target Linux platform with CDC Ethernet
equipment.
The host is Linux or Windows with libusb.

  When The device is plugged to the target system, the usb0 network
interface is up, like a no-virtualized system, but all frames are marked
in error.

ifconfig usb0 ->
usb0      Link encap:Ethernet  HWaddr 92:A9:08:75:E0:83
          inet adr:172.17.100.100  Bcast:172.17.255.255  Masque:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:687 dropped:0 overruns:0 frame:0
          TX packets:0 errors:3 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000
          RX bytes:0 (0.0 GiB)  TX bytes:0 (0.0 MiB)


  So I made a Linux qemu version with DEBUG_PACKET defined in the
'usb-uhci.c' file.
All initialisation before loading the usbnet module, work fine, but when
I load usbnet modules, It seems that usb communcation with external
device and target system fails. I don't know very well USB protcols and
CDC communication, so I'm not sure.

  My target's kernel is 2.6.12, but the problem exists with 2.6.14 and
2.6.18 too (with initial usbnet module is replaced by both usbnet and
cdc_ether modules).  Is anybody able to use CDC equipment with qemu
subsystem ? If not, I can modify the qemu usb-uhci support. But I don't
know where to begin. Can you give me some advice ?

  With the strace command on qemu system, I have see ioctl command
fail.   ("ioctl(8, UI_DEV_DESTROY or USBDEVFS_BULK, 0xbfeec200) = -1
EINVAL (Invalid argument)" I trace the same message with DEBUG defined
in usb-linux.c the Bulk message fail)

   Thanks in advance for any help or advice.

Best regards
Frédéric Blanchet-Momas

.

Message on the qemu stdout with DEBUG_PACKET defined :

System intialisation
...
...
frame 139: pid=IN addr=0x02 ep=0 len=64
   ret=26 p->len = 64 data_in= 1a 03 43 00 44 00 43 00 20 00 45 00 74 00
68 00 65 00 72 00 6e 00 65 00 74 00

frame 140: pid=OUT addr=0x02 ep=0 len=0
   p->len = 0 data_out=
   ret=0

frame 149: pid=SETUP addr=0x02 ep=0 len=8
   p->len = 8 data_out= 80 06 05 03 09 04 ff 00
   ret=54

frame 149: pid=IN addr=0x02 ep=0 len=64
   ret=54 p->len = 64 data_in= 36 03 43 00 44 00 43 00 20 00 43 00 6f 00
6d 00 6d 00 75 00 6e 00 69 00 63 00 61 00 74 00 69 00 6f 00 6e 00 73 00
20 00 43 00 6f 00 6e 00 74 00 72 00 6f 00 6c 00

frame 151: pid=OUT addr=0x02 ep=0 len=0
   p->len = 0 data_out=
   ret=0

//-> usbnet.ko loaded

frame 1851: pid=SETUP addr=0x02 ep=0 len=8
   p->len = 8 data_out= 01 0b 01 00 01 00 00 00
   ret=0

frame 1851: pid=IN addr=0x02 ep=0 len=0
   ret=0

frame 1910: pid=SETUP addr=0x02 ep=0 len=8
   p->len = 8 data_out= 80 06 03 03 09 04 ff 00
   ret=26

frame 1910: pid=IN addr=0x02 ep=0 len=64
   ret=26 p->len = 64 data_in= 1a 03 39 00 32 00 41 00 39 00 30 00 38 00
37 00 35 00 45 00 30 00 38 00 33 00

frame 1912: pid=OUT addr=0x02 ep=0 len=0
   p->len = 0 data_out=
   ret=0

frame 535: pid=IN addr=0x02 ep=1 len=64
   ret=-3

frame 560: pid=IN addr=0x02 ep=3 len=8
   ret=8 p->len = 8 data_in= a1 00 01 00 01 00 00 00

frame 562: pid=SETUP addr=0x02 ep=0 len=8
   p->len = 8 data_out= 02 01 00 00 81 00 00 00
   ret=0

frame 562: pid=IN addr=0x02 ep=0 len=0
   ret=0

frame 563: pid=IN addr=0x02 ep=1 len=64
   ret=-3

frame 564: pid=SETUP addr=0x02 ep=0 len=8
   p->len = 8 data_out= 02 01 00 00 81 00 00 00
   ret=0

frame 564: pid=IN addr=0x02 ep=0 len=0
   ret=0

frame 565: pid=IN addr=0x02 ep=1 len=64
   ret=-3

... // usb message loop -> the usb0 network marks in error all packets