dcb-pfc(8) — Linux manual page

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>

COLOPHON

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iproute2                     31 October 2020                  DCB-PFC(8)

Pages that refer to this page: dcb(8)

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