On 02/05/15 09:17, Rick van der Zwet wrote:
Hi Folks,

I have been trying to write a FreeBSD driver (if_rtl) for the Realtek
RTL8152 chipset, which is a USB to Ethernet dongle (using the Sitecom
LN-030 v3).

Some more details on the device:
[root@vbsd101 /usr/src]# usbconfig  -d ugen1.2 dump_device_desc
ugen1.2: <USB 10100 LAN Realtek> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (100mA)

   bLength = 0x0012
   bDescriptorType = 0x0001
   bcdUSB = 0x0210
   bDeviceClass = 0x0000
   bDeviceSubClass = 0x0000
   bDeviceProtocol = 0x0000
   bMaxPacketSize0 = 0x0040
   idVendor = 0x0bda
   idProduct = 0x8152
   bcdDevice = 0x2000
   iManufacturer = 0x0001  <Realtek>
   iProduct = 0x0002  <USB 10/100 LAN>
   iSerialNumber = 0x0003  <64D1A3318180>
   bNumConfigurations = 0x0002



[root@vbsd101 /usr/src]# usbconfig  -d ugen1.2 dump_all_config_desc
ugen1.2: <USB 10100 LAN Realtek> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (100mA)


  Configuration index 0

     bLength = 0x0009
     bDescriptorType = 0x0002
     wTotalLength = 0x0027
     bNumInterfaces = 0x0001
     bConfigurationValue = 0x0001
     iConfiguration = 0x0000  <no string>
     bmAttributes = 0x00a0
     bMaxPower = 0x0032

     Interface 0
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0000
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0003
       bInterfaceClass = 0x00ff
       bInterfaceSubClass = 0x00ff
       bInterfaceProtocol = 0x0000
       iInterface = 0x0000  <no string>

      Endpoint 0
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0081  <IN>
         bmAttributes = 0x0002  <BULK>
         wMaxPacketSize = 0x0200
         bInterval = 0x0000
         bRefresh = 0x0000
         bSynchAddress = 0x0000

      Endpoint 1
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0002  <OUT>
         bmAttributes = 0x0002  <BULK>
         wMaxPacketSize = 0x0200
         bInterval = 0x0000
         bRefresh = 0x0000
         bSynchAddress = 0x0000

      Endpoint 2
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0083  <IN>
         bmAttributes = 0x0003  <INTERRUPT>
         wMaxPacketSize = 0x0002
         bInterval = 0x0008
         bRefresh = 0x0000
         bSynchAddress = 0x0000



  Configuration index 1

     bLength = 0x0009
     bDescriptorType = 0x0002
     wTotalLength = 0x0050
     bNumInterfaces = 0x0002
     bConfigurationValue = 0x0002
     iConfiguration = 0x0000  <no string>
     bmAttributes = 0x00a0
     bMaxPower = 0x0032

     Interface 0
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0000
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0001
       bInterfaceClass = 0x0002
       bInterfaceSubClass = 0x0006
       bInterfaceProtocol = 0x0000
       iInterface = 0x0005  <CDC Communications Control>

       Additional Descriptor

       bLength = 0x05
       bDescriptorType = 0x24
       bDescriptorSubType = 0x00
        RAW dump:
        0x00 | 0x05, 0x24, 0x00, 0x10, 0x01


       Additional Descriptor

       bLength = 0x05
       bDescriptorType = 0x24
       bDescriptorSubType = 0x06
        RAW dump:
        0x00 | 0x05, 0x24, 0x06, 0x00, 0x01


       Additional Descriptor

       bLength = 0x0d
       bDescriptorType = 0x24
       bDescriptorSubType = 0x0f
        RAW dump:
        0x00 | 0x0d, 0x24, 0x0f, 0x03, 0x00, 0x00, 0x00, 0x00,
        0x08 | 0xea, 0x05, 0x00, 0x00, 0x00


      Endpoint 0
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0083  <IN>
         bmAttributes = 0x0003  <INTERRUPT>
         wMaxPacketSize = 0x0010
         bInterval = 0x0008
         bRefresh = 0x0000
         bSynchAddress = 0x0000


     Interface 1
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0001
       bAlternateSetting = 0x0000
       bNumEndpoints = 0x0000
       bInterfaceClass = 0x000a
       bInterfaceSubClass = 0x0000
       bInterfaceProtocol = 0x0000
       iInterface = 0x0000  <no string>


     Interface 1 Alt 1
       bLength = 0x0009
       bDescriptorType = 0x0004
       bInterfaceNumber = 0x0001
       bAlternateSetting = 0x0001
       bNumEndpoints = 0x0002
       bInterfaceClass = 0x000a
       bInterfaceSubClass = 0x0000
       bInterfaceProtocol = 0x0000
       iInterface = 0x0004  <Ethernet Data>

      Endpoint 0
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0081  <IN>
         bmAttributes = 0x0002  <BULK>
         wMaxPacketSize = 0x0200
         bInterval = 0x0000
         bRefresh = 0x0000
         bSynchAddress = 0x0000

      Endpoint 1
         bLength = 0x0007
         bDescriptorType = 0x0005
         bEndpointAddress = 0x0002  <OUT>
         bmAttributes = 0x0002  <BULK>
         wMaxPacketSize = 0x0200
         bInterval = 0x0000
         bRefresh = 0x0000
         bSynchAddress = 0x0000


Unfortunately there is no datasheet available, I quote ``` Due to
company policy, we only release Datasheet to our ODM/OEM (which have
signed a company to company NDA with Realtek). Please follow the linux
source code for porting, thanks.''' so I am stuck with 'reverse'
engineering and best guessing.


When looking at the usb trace on Linux with wireshark
(https://rickvanderzwet.nl/svn/personal/freebsd-rtl-driver/linux-trace.pcapng.gz)
I see a "CDC" like packets passing by, the description of the chipset
also hints something in this way: "Supports CDC-ECM".


[root@vbsd101 /usr/src]# usbconfig -d ugen1.2 set_config 1

[root@vbsd101 /usr/src]# tail -4 /var/log/messages
Feb  5 08:58:12 vbsd101 kernel: cdce0: <CDC Communications Control> on
usbus1
Feb  5 08:58:12 vbsd101 kernel: ue0: <USB Ethernet> on cdce0
Feb  5 08:58:12 vbsd101 kernel: ue0: Ethernet address: 64:d1:a3:31:81:80
Feb  5 08:58:12 vbsd101 devd: Executing '/etc/pccard_ether ue0 start'

[root@vbsd101 /usr/src]# ifconfig ue0
ue0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
     ether 64:d1:a3:31:81:80
     inet 192.168.5.200 netmask 0xffffff00 broadcast 192.168.5.255
     nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

How-ever there is no traffic possible and also no bulk requests are done.



Looking at the if_rue(4) and the linux r8152.c code, basically I got
this far in porting but yet no working code:
     https://rickvanderzwet.nl/svn/personal/freebsd-rtl-driver/

There are no bulk out and in packets passing trough, so I am basically
stuck now, not knowing how-to continue this journey. Could anybody give
me an hint on how-to get this train going again?

Thanks in advance!
/Rick

Hi Rick,

I think this hardware is compatible to if_cdce, but you need to implement some vendor specific codes to handle the PHY/MIIBUS. That is what makes it a bit difficult.

--HPS

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