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.\" $NetBSD: cdce.4,v 1.4 2004/12/08 18:35:56 peter Exp $ 29.\" $FreeBSD$ 30.\" 31.Dd November 24, 2015 32.Dt CDCE 4 33.Os 34.Sh NAME 35.Nm cdce 36.Nd "USB Communication Device Class Ethernet driver" 37.Sh SYNOPSIS 38To compile this driver into the kernel, 39place the following lines in your 40kernel configuration file: 41.Bd -ragged -offset indent 42.Cd "device uhci" 43.Cd "device ohci" 44.Cd "device usb" 45.Cd "device miibus" 46.Cd "device uether" 47.Cd "device cdce" 48.Ed 49.Pp 50Alternatively, to load the driver as a 51module at boot time, place the following line in 52.Xr loader.conf 5 : 53.Bd -literal -offset indent 54if_cdce_load="YES" 55.Ed 56.Sh DESCRIPTION 57The 58.Nm 59driver provides support for USB Host-to-Host (aka USB-to-USB) and 60USB-to-Ethernet bridges based on the USB Communication Device Class 61(CDC) and Ethernet subclass. 62.Pp 63The USB bridge appears as a regular network interface on both sides, 64transporting Ethernet frames. 65.Pp 66For more information on configuring this device, see 67.Xr ifconfig 8 . 68.Pp 69USB 1.x bridges support speeds of up to 12Mbps, and USB 2.0 speeds of 70up to 480Mbps. 71.Pp 72Packets are 73received and transmitted over separate USB bulk transfer endpoints. 74.Pp 75The 76.Nm 77driver does not support different media types or options. 78.Sh HARDWARE 79The following devices are supported by the 80.Nm 81driver: 82.Pp 83.Bl -bullet -compact 84.It 85Prolific PL-2501 Host-to-Host Bridge Controller 86.It 87Sharp Zaurus PDA 88.It 89Terayon TJ-715 DOCSIS Cable Modem 90.El 91.Sh DIAGNOSTICS 92.Bl -diag 93.It "cdce%d: no union descriptor" 94The driver could not fetch an interface descriptor from the USB 95device. 96For a manually added USB vendor/product, the CDCE_NO_UNION flag 97can be tried to work around the missing descriptor. 98.It "cdce%d: no data interface" 99.It "cdce%d: could not read endpoint descriptor" 100.It "cdce%d: unexpected endpoint" 101.It "cdce%d: could not find data bulk in/out" 102For a manually added USB vendor/product, these errors indicate 103that the bridge is not compatible with the driver. 104.It "cdce%d: watchdog timeout" 105A packet was queued for transmission and a transmit command was 106issued, however the device failed to acknowledge the transmission 107before a timeout expired. 108.It "cdce%d: no memory for rx list -- packet dropped!" 109Memory allocation through MGETHDR or MCLGET failed, the system 110is running low on mbufs. 111.It "cdce%d: abort/close rx/tx pipe failed" 112.It "cdce%d: rx/tx list init failed" 113.It "cdce%d: open rx/tx pipe failed" 114.It "cdce%d: usb error on rx/tx" 115.El 116.Sh SEE ALSO 117.Xr arp 4 , 118.Xr intro 4 , 119.Xr ipheth 4 , 120.Xr netintro 4 , 121.Xr urndis 4 , 122.Xr usb 4 , 123.Xr ifconfig 8 124.Rs 125.%T "Universal Serial Bus Class Definitions for Communication Devices" 126.%U http://www.usb.org/developers/devclass_docs/usbcdc11.pdf 127.Re 128.Rs 129.%T "Data sheet Prolific PL-2501 Host-to-Host Bridge/Network Controller" 130.%U http://tech.prolific.com.tw/visitor/fcabdl.asp?fid=20679530 131.Re 132.Sh HISTORY 133The 134.Nm 135device driver first appeared in 136.Ox 3.6 , 137.Nx 3.0 138and 139.Fx 6.0 . 140.Sh AUTHORS 141.An -nosplit 142The 143.Nm 144driver was written by 145.An Craig Boston Aq Mt craig@tobuj.gank.org 146based on the 147.Xr aue 4 148driver written by 149.An Bill Paul Aq Mt wpaul@windriver.com 150and ported to 151.Ox 152by 153.An Daniel Hartmeier Aq Mt dhartmei@openbsd.org . 154.Sh CAVEATS 155Many USB devices notoriously fail to report their class and interfaces 156correctly. 157Undetected products might work flawlessly when their vendor and product IDs 158are added to the driver manually. 159