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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 configura-
       tion, 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 argu-
       ments. This instructs the tool to show the value of a given parameter.
       When no parameters are given, the tool shows the complete PFC configu-
       ration.
       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 pro-
              cessing 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 <net-
       dev AT vger.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 AT pmachata.org>
iproute2                        31 October 2020                     DCB-PFC(8)