phpMan > man > dcb-pfc(8)

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



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

SYNOPSIS
       dcb [ OPTIONS ] pfc { COMMAND | help }


       dcb pfc show dev DEV [ pfc-cap ] [ prio-pfc ] [ macsec-bypass ] [ delay ] [ requests ] [ in‐‐
               dications ]

       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 key‐
       word without further arguments. This instructs the tool to show the value of a given parame‐
       ter. 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 AT vger.org> where the de‐
       velopment 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)