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 di-
rection, 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@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>
iproute2 31 October 2020 DCB-PFC(8)
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