1.\" Copyright (c) 2004 Daniel Hartmeier 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 8.\" - Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" - Redistributions in binary form must reproduce the above 11.\" copyright notice, this list of conditions and the following 12.\" disclaimer in the documentation and/or other materials provided 13.\" with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 25.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26.\" POSSIBILITY OF SUCH DAMAGE. 27.\" 28.\" $OpenBSD: cdce.4,v 1.14 2008/03/14 15:19:52 sthen Exp $ 29.\" 30.Dd $Mdocdate: March 14 2008 $ 31.Dt CDCE 4 32.Os 33.Sh NAME 34.Nm cdce 35.Nd USB Communication Device Class Ethernet device 36.Sh SYNOPSIS 37.Cd "cdce* at uhub?" 38.Sh DESCRIPTION 39The 40.Nm 41driver provides support for USB Host-to-Host (aka USB-to-USB) bridges 42based on the USB Communication Device Class (CDC) and Ethernet subclass, 43including the following: 44.Pp 45.Bl -bullet -compact -offset indent 46.It 47Acer Labs USB 2.0 Data Link 48.It 49FRITZ!Box Fon ata 1020 50.It 51G.Mate YP3X00 52.It 53Motorola USBNET 54.It 55NetChip EthernetGadget 56.It 57Prolific PL-2501 58.It 59Sharp Zaurus 60.It 61Sony Ericsson K610i 62.It 63Zyxel P-971M 64.El 65.Pp 66The USB bridge appears as a regular network interface on both sides, 67transporting Ethernet frames. 68USB 1.x bridges support speeds of up to 12Mbps, and USB 2.0 speeds of 69up to 480Mbps. 70Packets are 71received and transmitted over separate USB bulk transfer endpoints. 72.Pp 73The 74.Nm 75driver does not support different media types or options. 76For more information on configuring this device, see 77.Xr ifconfig 8 . 78.Sh DIAGNOSTICS 79.Bl -diag 80.It "cdce%d: extra ethernet descriptor" 81There is more than one Ethernet descriptor. 82.It "cdce%d: no data interface" 83The data interface announced by the union descriptor cannot be found. 84.It "cdce%d: no descriptor for interrupt endpoint %d" 85.It "cdce%d: interface alternate setting %d failed" 86.It "cdce%d: no descriptor for bulk endpoint %d" 87.It "cdce%d: could not find data bulk in/out" 88For a manually added USB vendor/product, these errors indicate 89that the bridge is not compatible with the driver. 90.It "cdce%d: watchdog timeout" 91A packet was queued for transmission and a transmit command was 92issued, however the device failed to acknowledge the transmission 93before a timeout expired. 94.It "cdce%d: no memory for rx list -- packet dropped!" 95Memory allocation through MGETHDR or MCLGET failed, the system 96is running low on mbufs. 97.It "cdce%d: abort/close rx/tx/interrupt pipe failed" 98.It "cdce%d: rx/tx list init failed" 99.It "cdce%d: open rx/tx/interrupt pipe failed" 100.It "cdce%d: usb error on rx/tx" 101.El 102.Sh SEE ALSO 103.Xr arp 4 , 104.Xr cdcef 4 , 105.Xr intro 4 , 106.Xr netintro 4 , 107.Xr usb 4 , 108.Xr hostname.if 5 , 109.Xr ifconfig 8 110.Rs 111.%T "Universal Serial Bus Class Definitions for Communication Devices" 112.%O http://www.usb.org/developers/devclass_docs/usbcdc11.pdf 113.Re 114.Rs 115.%T "Data sheet Prolific PL-2501 Host-to-Host Bridge/Network Controller" 116.Re 117.Sh HISTORY 118The 119.Nm 120device driver first appeared in 121.Ox 3.6 . 122.Sh AUTHORS 123.An -nosplit 124The 125.Nm 126driver was written by 127.An Craig Boston Aq craig@tobuj.gank.org 128based on the 129.Xr aue 4 130driver written by 131.An Bill Paul Aq wpaul@windriver.com 132and ported to 133.Ox 134by 135.An Daniel Hartmeier Aq dhartmei@openbsd.org . 136.Sh CAVEATS 137Many USB devices notoriously fail to report their class and interfaces 138correctly. 139Undetected products might work flawlessly when their vendor and product IDs 140are added to the driver manually. 141