Name
dcb-pfc - show / manipulate PFC (Priority-based Flow Control) settings of the DCB (Data Center Bridging) subsystemSynopsis
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)