DCB-PFC(8)			     Linux			    DCB-PFC(8)

NAME
       dcb-pfc - show / manipulate PFC (Priority-based Flow Control) settings
       of the DCB (Data Center Bridging) subsystem

SYNOPSIS

       dcb [ OPTIONS ]	pfc { COMMAND | help }


       dcb pfc show dev DEV [ pfc-cap ] [ prio-pfc ] [ macsec-bypass ] [ delay
	       ] [ requests ] [ indications ]

       dcb pfc set dev DEV [ prio-pfc PFC-MAP ] [ macsec-bypass { on | off } ]
	       [ delay INTEGER ]

       PFC-MAP := [ PFC-MAP ] PFC-MAPPING

       PFC-MAPPING := { PRIO | all }:{	on | off }

       PRIO := { 0 .. 7 }


DESCRIPTION
       dcb pfc is used to configure Priority-based Flow Control attributes
       through Linux DCB (Data Center Bridging) interface. PFC permits marking
       flows with a certain priority as lossless, and holds related
       configuration, as well as PFC counters.


PARAMETERS
       For read-write parameters, the following describes only the write
       direction, i.e. as used with the set command. For the show command, the
       parameter name is to be used as a simple keyword without further
       arguments. This instructs the tool to show the value of a given
       parameter. When no parameters are given, the tool shows the complete
       PFC configuration.


       pfc-cap
	      A read-only property that shows the number of traffic classes
	      that may simultaneously support PFC.


       requests
	      A read-only count of the sent PFC frames per traffic class. Only
	      shown when -s is given, or when requested explicitly.


       indications
	      A read-only count of the received PFC frames per traffic class.
	      Only shown when -s is given, or when requested explicitly.


       macsec-bypass { on | off }
	      Whether the sending station is capable of bypassing MACsec
	      processing when MACsec is disabled.


       prio-pfc PFC-MAP
	      PFC-MAP uses the array parameter syntax, see dcb(8) for details.
	      Keys are priorities, values are on / off indicators of whether
	      PFC is enabled for a given priority.


       delay INTEGER
	      The allowance made for round-trip propagation delay of the link
	      in bits.	The value shall be 0..65535.


EXAMPLE & USAGE
       Enable PFC on priorities 6 and 7, leaving the rest intact:


       # dcb pfc set dev eth0 prio-pfc 6:on 7:on

       Disable PFC of all priorities except 6 and 7, and configure delay to
       4096 bits:


       # dcb pfc set dev eth0 prio-pfc all:off 6:on 7:on delay 0x1000

       Show what was set:


       # dcb pfc show dev eth0
       pfc-cap 8 macsec-bypass off delay 4096
       prio-pfc 0:off 1:off 2:off 3:off 4:off 5:off 6:on 7:on


EXIT STATUS
       Exit status is 0 if command was successful or a positive integer upon
       failure.


SEE ALSO
       dcb(8)


REPORTING BUGS
       Report any bugs to the Network Developers mailing list
       <netdev@vger.kernel.org> where the development and maintenance is
       primarily done.	You do not have to be subscribed to the list to send a
       message there.


AUTHOR
       Petr Machata <me@pmachata.org>

iproute2			31 October 2020			    DCB-PFC(8)