problem with udbp and netgraph in the usb LAN

Kiselev 1801 at
Sat Jan 29 07:24:10 PST 2005

On Thu, Jan 27, 2005 at 09:54:14AM +0300, 1801 wrote:
> Hi, all
> I have usb2usb link cable (no name)and try make usb network on two 
> hosts  (FreeBSD 5.3).
> I do everything as written in man 4 udbp:
> kldload netgraph
> kldload udbp
> Result :
> udbp0: Prolific Technology Inc. PL2302 Host-Host interface, rev 
> 1.00/0.01,  addr2, iclass 255/0.
> Then make:
> ngctl mkpeer udbp0: iface data inet, ifconfig ng0 on  
> both hosts.
> Ping from to  disappear through 1 minutes.
> How to make steady connection?
> Thanks in advance, Yuri.

>> What kind of USB controller do you have?
>> Looking through the code I found this problem:
>> If a transmitted packet has a length that is divisible by 
>> "MaxPacketLength" then udbp_in_transfer_cb() will not be called. In 
>> other words the transmission will stop. So when udbp is sending 
>> packets, the flag USBD_FORCE_SHORT_XFER must be set?
>> --
>> HPS

My USB controller is:
ohci0: <SiS 5571 USB controller> mem 0xee000000-0xee000fff irq 20 at 
device 2.2
on pci0
usb0: <SiS 5571 USB controller> on ohci0
ohci1: <SiS 5571 USB controller> mem 0xee001000-0xee001fff irq 23 at 
device 2.3
on pci0
usb1: <SiS 5571 USB controller> on ohci1.
How to execute the idea set the flag USBD_FORCE_SHORT_XFER?
I do not found anything in the(sysctl, rc.conf, GENERIC), and what to 
correct in
the /usr/src/sys/dev/usb/ohci.c:    if ((flags & USBD_FORCE_SHORT_XFER) &&
i don't know.
Thanks in advance, Yuri

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