USB RNDIS Bad CDC Descriptors?

Scott,

There are two setup related query.

a) Is this device follows RNDIS protocol only ? RNDIS protocol is required by devices to work with Windows OS. and CDC is required for devices to work on Linux/MacOS systems.

You need to make sure that appropriate host driver is enabled in menuconfig which can talk to the device.

b) Is this RNDIS device ceritifed product or you are currently developing/programming it ?

I think the device is sending RNDIS descriptors only and EVM host is expecting CDC descriptors.

Regards,
ajay

The device presents itself as a composite device with a combination of RNDIS networ interface, serial connections, and some internal mass storage devices.  This device has been tested with other Linux systems Ubuntu, etc without issue.  I am concerned about the vintage of the 2.6.18 kernel (LSP 2.10) for the DM365.  Is there a tool I can use or other means to further see the descriptor information that is being sent?

Scott,

YOu can get the descriptors reported using below command,

$ cat  /proc/bus/usb/devices

CONFIG_USBFS needs to be enabled.

Regards,

Ajay

Ajay,

Using the cat command did not show anything.  But here is the info I got from running lsusb -vvvv

NOTE: This device does not have a CDC union descriptor, and I think that is why it is not installed. There is a comment in cdc_ether.c about it, as well as some debug messages.  I need to find away to get this device to install.  Any ideas?

Bus 001 Device 002: ID 19a5:0004
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x19a5
  idProduct          0x0004
  bcdDevice            0.00
  iManufacturer           1 Harris RF Communications
  iProduct                2 Falcon III Radio
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          299
    bNumInterfaces          9
    bConfigurationValue     1
    iConfiguration          8 Main Configuration
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol    255 Vendor Specific (MSFT RNDIS?)
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  bytes 8 once
        bInterval               1
        CDC Header:
          bcdCDC               10.01
        CDC Call Management:
          bmCapabilities       0x00
          bDataInterface        0
        CDC ACM:
          bmCapabilities       00
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk (Zip)
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol    255 Vendor Specific (MSFT RNDIS?)
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  bytes 8 once
        bInterval               1
        CDC Header:
          bcdCDC               1.10
        CDC Call Management:
          bmCapabilities       0x00
          bDataInterface        1
        CDC ACM:
          bmCapabilities       02
            line coding and serial state
        CDC Union:
          bMasterInterface        3
          bSlaveInterface         4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x85  EP 5 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x03  EP 3 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol    255 Vendor Specific (MSFT RNDIS?)
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  bytes 8 once
        bInterval               1
        CDC Header:
          bcdCDC               1.10
        CDC Call Management:
          bmCapabilities       0x00
          bDataInterface        1
        CDC ACM:
          bmCapabilities       02
            line coding and serial state
        CDC Union:
          bMasterInterface        5
          bSlaveInterface         6
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        6
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x86  EP 6 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        7
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol    255 Vendor Specific (MSFT RNDIS?)
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  bytes 8 once
        bInterval               1
        CDC Header:
          bcdCDC               1.10
        CDC Call Management:
          bmCapabilities       0x00
          bDataInterface        1
        CDC ACM:
          bmCapabilities       02
            line coding and serial state
        CDC Union:
          bMasterInterface        7
          bSlaveInterface         8
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        8
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 Data
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x87  EP 7 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x05  EP 5 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  bytes 64 once
        bInterval               0

Bus 001 Device 001: ID 0000:0000
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x0000
  idProduct          0x0000
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.18_pro500-TVP musb-hcd
  iProduct                2 MUSB HDRC host driver
  iSerial                 1 musb_hdrc
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  bytes 2 twice
        bInterval              12
#

I'll throw in my 2 cents. I don't know anything about CDC and RNDIS other than RNDIS Gadgets don't compile in DVSDK. I took a quick look at 2.6.18 kernel vs the 2.6.33 kernel. Kernels newer than 2007-05-23 have additional lines of code to deal with CDC descriptors in the endpoint descriptor.

drivers/usb/net/cdc_ether.c
...
int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
{
...
                "CDC descriptors on config\n");
    }

    /* Maybe CDC descriptors are after the endpoint?  This bug has
     * been seen on some 2Wire Inc RNDIS-ish products.
     */
    if (len == 0) {
        struct usb_host_endpoint    *hep;

        hep = intf->cur_altsetting->endpoint;
        if (hep) {
            buf = hep->extra;
            len = hep->extralen;
        }
        if (len)
            dev_dbg(&intf->dev,
                "CDC descriptors on endpoint\n");
    }

    /* this assumes that if there's a non-RNDIS vendor variant
...

Just guessing.

Hi Scott,

I am facing similar issue. Did you solved it ?