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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
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
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
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-02-02. (At that time, the date of the most recent commit
that was found in the repository was 2025-01-21.) 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 [email protected]
iproute2 31 October 2020 DCB-PFC(8)
Pages that refer to this page: dcb(8)
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HTML rendering created 2025-02-02 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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