159 lines
4.7 KiB
Groff
159 lines
4.7 KiB
Groff
.\" Copyright (c) 2004 Daniel Hartmeier
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" - Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" - Redistributions in binary form must reproduce the above
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.\" copyright notice, this list of conditions and the following
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.\" disclaimer in the documentation and/or other materials provided
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.\" with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $NetBSD: cdce.4,v 1.4 2004/12/08 18:35:56 peter Exp $
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.\" $FreeBSD$
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.\"
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.Dd November 24, 2015
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.Dt CDCE 4
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.Os
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.Sh NAME
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.Nm cdce
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.Nd "USB Communication Device Class Ethernet driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device uhci"
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.Cd "device ohci"
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.Cd "device usb"
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.Cd "device miibus"
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.Cd "device uether"
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.Cd "device cdce"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_cdce_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for USB Host-to-Host (aka USB-to-USB) and
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USB-to-Ethernet bridges based on the USB Communication Device Class
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(CDC) and Ethernet subclass.
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.Pp
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The USB bridge appears as a regular network interface on both sides,
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transporting Ethernet frames.
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.Pp
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Pp
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USB 1.x bridges support speeds of up to 12Mbps, and USB 2.0 speeds of
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up to 480Mbps.
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.Pp
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Packets are
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received and transmitted over separate USB bulk transfer endpoints.
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.Pp
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The
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.Nm
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driver does not support different media types or options.
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.Sh HARDWARE
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The following devices are supported by the
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.Nm
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driver:
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.Pp
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.Bl -bullet -compact
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.It
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Prolific PL-2501 Host-to-Host Bridge Controller
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.It
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Sharp Zaurus PDA
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.It
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Terayon TJ-715 DOCSIS Cable Modem
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "cdce%d: no union descriptor"
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The driver could not fetch an interface descriptor from the USB
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device.
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For a manually added USB vendor/product, the CDCE_NO_UNION flag
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can be tried to work around the missing descriptor.
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.It "cdce%d: no data interface"
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.It "cdce%d: could not read endpoint descriptor"
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.It "cdce%d: unexpected endpoint"
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.It "cdce%d: could not find data bulk in/out"
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For a manually added USB vendor/product, these errors indicate
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that the bridge is not compatible with the driver.
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.It "cdce%d: watchdog timeout"
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A packet was queued for transmission and a transmit command was
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issued, however the device failed to acknowledge the transmission
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before a timeout expired.
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.It "cdce%d: no memory for rx list -- packet dropped!"
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Memory allocation through MGETHDR or MCLGET failed, the system
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is running low on mbufs.
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.It "cdce%d: abort/close rx/tx pipe failed"
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.It "cdce%d: rx/tx list init failed"
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.It "cdce%d: open rx/tx pipe failed"
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.It "cdce%d: usb error on rx/tx"
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.El
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.Sh SEE ALSO
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.Xr arp 4 ,
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.Xr intro 4 ,
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.Xr ipheth 4 ,
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.Xr netintro 4 ,
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.Xr urndis 4 ,
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.Xr usb 4 ,
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.Xr ifconfig 8
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.Rs
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.%T "Universal Serial Bus Class Definitions for Communication Devices"
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.%U http://www.usb.org/developers/devclass_docs/usbcdc11.pdf
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.Re
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.Rs
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.%T "Data sheet Prolific PL-2501 Host-to-Host Bridge/Network Controller"
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.%U http://tech.prolific.com.tw/visitor/fcabdl.asp?fid=20679530
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.Re
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Ox 3.6 ,
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.Nx 3.0
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and
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.Fx 6.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Craig Boston Aq Mt craig@tobuj.gank.org
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based on the
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.Xr aue 4
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driver written by
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.An Bill Paul Aq Mt wpaul@windriver.com
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and ported to
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.Ox
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by
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.An Daniel Hartmeier Aq Mt dhartmei@openbsd.org .
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.Sh CAVEATS
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Many USB devices notoriously fail to report their class and interfaces
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correctly.
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Undetected products might work flawlessly when their vendor and product IDs
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are added to the driver manually.
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