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

       --policy [physical|all_ethN]

       --prefix [string]
              string use for embedded NICs in the physical policy (default=em)

       --nopirq
              Do not use $PIR table for mapping PCI device to slot. Some BIOS have incorrect values.

       --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  biosdevname  uses,
       specifically  dmidecode  to read the SMBIOS Type 9 and Type 41 tables, and biosdecode to read the PCI IRQ
       Routing Table.  Please include the output of each of these programs in any bug reports.

AUTHOR

       biosdevname was written by  Matt Domsch <Matt_Domsch@dell.com>

       This manual page was written by Rudy Gevaert <Rudy.Gevaert@UGent.be>, for the Debian project (but may  be
       used by others).

                                                  Nov 28, 2010                                    BIOSDEVNAME(1)