1CGDCBXD(8)                     libcgroup Manual                     CGDCBXD(8)
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NAME

6       cgdcbxd - control group dcb event net_prio daemon
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SYNOPSIS

10       cgdcbxd [options]
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DESCRIPTION

14       cgdcbxd  is  a daemon used to monitor DCB netlink events and manage the
15       net_prio control group subsystem. The daemon keeps  the  hierarchy  and
16       priority mappings in sync with DCBX Application events.
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18       When a DCB netlink event is received cgdcbxd parses the application TLV
19       and identifies new, updated, and deleted application tuples.  The  DCBX
20       application  TLV  uses the selector, protocol ID and priority fields to
21       identify and set application priority. The selector field specifies the
22       protocol ID type supported types are
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24       Ethertype = 1
25       TCP or SCTP = 2
26       UDP or DCCP = 3
27       TCP, SCTP UDP, and DCCP = 4
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29       The  protocol ID field specifies the port or ethertype depending on the
30       selector field and the priority gives a priority value (0-7).  Used  to
31       set the net_prio.ifpriomap.
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33       When  a  new  application tuple is identified cgdcbxd creates a control
34       group under the net_prio subsystem using the  directory  cgdcbx-<selec‐
35       tor>-<protocolID>.
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37       The  <selector>  field  uses  the IEEE selector values listed above for
38       both CEE DCBX and IEEE DCBX versions.
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40       This control group will be managed by cgdcbx and the ifpriomap will  be
41       kept  in  sync with the application TLV. If a DCB netlink event removes
42       the application selector-protocolID tuple then cgdcbx removes the  con‐
43       trol group.
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45       This  may  be  used with cgrulesengd to create configuration rules that
46       map applications and users to  DCBX  selector-protocolID  tuples.  Note
47       protocol  ID  and  selector values use the well-known protocol type and
48       port or ethertype  defined  by  the  IANA  (Internet  Assigned  Numbers
49       Authority) the application are not required to use the well-known ports
50       this is only used to identify the application.
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OPTIONS

54       -h     Display help.
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56       -n     Don't fork the daemon, stay in the foreground.
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58       -v     Show version
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FILES

61       /etc/cgrules.conf
62       the default libcgroup configuration file
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SOURCES

65       o      IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)  o
66              IANA    (http://www.iana.org/assignments/service-names-port-num‐
67              bers/service-names-port-numbers.xml)
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NOTES

70       Support for the net_prio subsystem was added in the 3.3 Linux kernel.
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Signals

73       SIGUSR1 dumps list of managed interfaces and control groups  with  pri‐
74       omaps.
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SEE ALSO

77       cgrulesengd(8), cgrules.conf(5) lldpad(8), lldptool(8),
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AUTHOR

80       John Fastabend <john.r.fastabend@intel.com>
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84Linux                             2012-01-16                        CGDCBXD(8)
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