cdce - USB Communication Device Class Ethernet driver
cdce* at uhub? port ?
The cdce driver provides support for USB Host-to-Host (aka
bridges based on the USB Communication Device Class (CDC)
subclass, including the following:
+o Prolific PL-2501
+o Sharp Zaurus
The USB bridge appears as a regular network interface on
transporting Ethernet frames.
For more information on configuring this device, see ifconfig(8).
USB 1.x bridges support speeds of up to 12Mbps, and USB 2.0
speeds of up
Packets are received and transmitted over separate USB bulk
The cdce driver does not support different media types or
cdce%d: no union descriptor The driver couldn't fetch an
from the USB device. For a manually added USB vendor/product,
the CDCE_NO_UNION flag can be tried to work around the missing descriptor.
cdce%d: no data interface
cdce%d: could not read endpoint descriptor
cdce%d: unexpected endpoint
cdce%d: could not find data bulk in/out For a manually
added USB vendor/product,
these errors indicate that the bridge is not
cdce%d: watchdog timeout A packet was queued for transmission and a
transmit command was issued, however the device failed to
transmission before a timeout expired.
cdce%d: no memory for rx list -- packet dropped! Memory allocation
through MGETHDR or MCLGET failed, the system is running low
cdce%d: abort/close rx/tx pipe failed
cdce%d: rx/tx list init failed
cdce%d: open rx/tx pipe failed
cdce%d: usb error on rx/tx
arp(4), intro(4), netintro(4), usb(4), hostname.if(5), ifconfig(8)
Universal Serial Bus Class Definitions for Communication
Data sheet Prolific PL-2501 Host-to-Host Bridge/Network
The cdce device driver first appeared in OpenBSD 3.6.
The cdce driver was written by Craig Boston <email@example.com> based
on the aue(4) driver written by
Bill Paul <firstname.lastname@example.org> and ported to OpenBSD by
Daniel Hartmeier <email@example.com>.
Many USB devices notoriously fail to report their class and
correctly. Undetected products might work flawlessly when
and product IDs are added to the driver manually.
OpenBSD 3.6 July 20, 2004
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