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NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | EXAMPLE & USAGE | EXIT STATUS | SEE ALSO | REPORTING BUGS | AUTHOR | COLOPHON |
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DCB-PFC(8) Linux DCB-PFC(8)
dcb-pfc - show / manipulate PFC (Priority-based Flow Control)
settings of the DCB (Data Center Bridging) subsystem
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 }
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.
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.
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 is 0 if command was successful or a positive integer
upon failure.
dcb(8)
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.
Petr Machata <me@pmachata.org>
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
iproute2 31 October 2020 DCB-PFC(8)
Pages that refer to this page: dcb(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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