Manual: dcb-pfc

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) inter‐
       face. 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 configura‐
       tion.

       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 ex‐
	      plicitly.

       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 in‐
	      dicators 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  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 

iproute2					       31 October 2020						  DCB-PFC(8)