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 simultane- ously 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 priori- ties, values are on / off indicators of whether PFC is enabled for a given prior- ity. 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 AT vger.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 AT pmachata.org> iproute2 31 October 2020 DCB-PFC(8)
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