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BIOSDEVNAME(1) General Commands Manual BIOSDEVNAME(1)
NAME
biosdevname - give BIOS-given name of a device
SYNOPSIS
biosdevname [options] [args]...
DESCRIPTION
biosdevname takes a kernel device name as an argument, and returns the BIOS-given name it
"should" be.
OPTIONS
-i, --interface
Treat [args] as ethernet devs
-d, --debug
Enable debugging
-p, --policy [physical|all_ethN]
-P, --prefix [string]
string use for embedded NICs in the physical policy (default=em)
-x, --nopirq
Do not use $PIR table for mapping PCI device to slot. Some BIOS have incorrect val-
ues.
-s, --smbios [x.y]
Require minimum SMBIOS version x.y
POLICIES
The physical policy is the current default. However, when invoking biosdevname in udev
rules, one should always specify the policy you want, as the default has changed over
time.
The physical policy uses the following scheme:
em<port>[_<virtual instance>]
for embedded NICs
p<slot>p<port>[_<virtual instance>]
for cards in PCI slots
The all_ethN policy makes a best guess at what the device order should be, with embedded
devices first, PCI cards in ascending slot order, and ports in ascending PCI
bus/device/function order breadth-first. However, this policy does not work if your PCI
devices are hot-plugged or hot-pluggable, including the virtual functions on an SR-IOV
device. In a hot-plug scenario, each separate udev instance will be invoked in parallel,
while the device tree is still being populated with new devices. Each udev instance will
see a different PCI tree, and thus cannot provide consistent enumeration. Use of this
policy should be limited to only scenarios where all PCI devices are present at boot
(cold-plug).
EXIT CODES
Returns 0 on success, with BIOS-suggested name printed to stdout.
Returns 1 on provided device name lookup failure.
Returns 2 if system BIOS does not provide naming information. biosdevname requires system
BIOS to provide naming information, either via SMBIOS or sysfs files.
Returns 3 if not run as root but requires root privileges.
Returns 4 if running in a virtual machine.
SEE ALSO
http://linux.dell.com/wiki/index.php/Oss/libnetdevname
http://linux.dell.com/files/biosdevname/
git://linux.dell.com/biosdevname.git
RELATED PROGRAMS
The dmidecode package contains two tools useful for debugging BIOS features that biosdev-
name uses, specifically dmidecode to read the SMBIOS Type 9 and Type 41 tables, and bios-
decode to read the PCI IRQ Routing Table. Please include the output of each of these pro-
grams in any bug reports.
AUTHOR
biosdevname was written by Matt Domsch <Matt_Domsch AT dell.com>
This manual page was written by Rudy Gevaert <Rudy.Gevaert AT UGent.be>, for the Debian
project (but may be used by others).
Nov 28, 2010 BIOSDEVNAME(1)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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