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UNIX for Beginners Questions & Answers
Help needed to modify search functionality
Post 303045577 by SIMMS7400 on Thursday 2nd of April 2020 07:25:46 AM
04-02-2020
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LEARN ABOUT FREEBSD
if_cdce
CDCE(4) BSD Kernel Interfaces Manual CDCE(4) NAME
cdce -- USB Communication Device Class Ethernet driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device uhci device ohci device usb device cdce Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_cdce_load="YES" DESCRIPTION
The cdce driver provides support for USB Host-to-Host (aka USB-to-USB) and USB-to-Ethernet bridges based on the USB Communication Device Class (CDC) and Ethernet subclass. The USB bridge appears as a regular network interface on both sides, 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 to 480Mbps. Packets are received and transmitted over separate USB bulk transfer endpoints. The cdce driver does not support different media types or options. HARDWARE
The following devices are supported by the cdce driver: o Prolific PL-2501 Host-to-Host Bridge Controller o Sharp Zaurus PDA o Terayon TJ-715 DOCSIS Cable Modem DIAGNOSTICS
cdce%d: no union descriptor The driver could not fetch an interface descriptor from the USB device. For a manually added USB vendor/prod- uct, 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 compatible with the driver. cdce%d: watchdog timeout A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the 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 on mbufs. 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 SEE ALSO
arp(4), intro(4), ipheth(4), netintro(4), urndis(4), usb(4), ifconfig(8) Universal Serial Bus Class Definitions for Communication Devices, http://www.usb.org/developers/devclass_docs/usbcdc11.pdf. Data sheet Prolific PL-2501 Host-to-Host Bridge/Network Controller, http://tech.prolific.com.tw/visitor/fcabdl.asp?fid=20679530. HISTORY
The cdce device driver first appeared in OpenBSD 3.6, NetBSD 3.0 and FreeBSD 6.0. AUTHORS
The cdce driver was written by Craig Boston <craig@tobuj.gank.org> based on the aue(4) driver written by Bill Paul <wpaul@windriver.com> and ported to OpenBSD by Daniel Hartmeier <dhartmei@openbsd.org>. CAVEATS
Many USB devices notoriously fail to report their class and interfaces correctly. Undetected products might work flawlessly when their ven- dor and product IDs are added to the driver manually. BSD
September 25, 2014 BSD