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+.TH DCB-PFC 8 "31 October 2020" "iproute2" "Linux"
+.SH NAME
+dcb-pfc \- show / manipulate PFC (Priority-based Flow Control) settings of
+the DCB (Data Center Bridging) subsystem
+.SH SYNOPSIS
+.sp
+.ad l
+.in +8
+
+.ti -8
+.B dcb
+.RI "[ " OPTIONS " ] "
+.B pfc
+.RI "{ " COMMAND " | " help " }"
+.sp
+
+.ti -8
+.B dcb pfc show dev
+.RI DEV
+.RB "[ " pfc-cap " ]"
+.RB "[ " prio-pfc " ]"
+.RB "[ " macsec-bypass " ]"
+.RB "[ " delay " ]"
+.RB "[ " requests " ]"
+.RB "[ " indications " ]"
+
+.ti -8
+.B dcb pfc set dev
+.RI DEV
+.RB "[ " prio-pfc " " \fIPFC-MAP " ]"
+.RB "[ " macsec-bypass " { " on " | " off " } ]"
+.RB "[ " delay " " \fIINTEGER\fR " ]"
+
+.ti -8
+.IR PFC-MAP " := [ " PFC-MAP " ] " PFC-MAPPING
+
+.ti -8
+.IR PFC-MAPPING " := { " PRIO " | " \fBall " }" \fB:\fR "{ "
+.IR \fBon\fR " | " \fBoff\fR " }"
+
+.ti -8
+.IR PRIO " := { " \fB0\fR " .. " \fB7\fR " }"
+
+.SH DESCRIPTION
+
+.B 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.
+
+.SH PARAMETERS
+
+For read-write parameters, the following describes only the write direction,
+i.e. as used with the \fBset\fR command. For the \fBshow\fR 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.
+
+.TP
+.B pfc-cap
+A read-only property that shows the number of traffic classes that may
+simultaneously support PFC.
+
+.TP
+.B requests
+A read-only count of the sent PFC frames per traffic class. Only shown when
+-s is given, or when requested explicitly.
+
+.TP
+.B indications
+A read-only count of the received PFC frames per traffic class. Only shown
+when -s is given, or when requested explicitly.
+
+.TP
+.B macsec-bypass \fR{ \fBon\fR | \fBoff\fR }
+Whether the sending station is capable of bypassing MACsec processing when
+MACsec is disabled.
+
+.TP
+.B prio-pfc \fIPFC-MAP
+\fIPFC-MAP\fR uses the array parameter syntax, see
+.BR dcb (8)
+for details. Keys are priorities, values are on / off indicators of whether
+PFC is enabled for a given priority.
+
+.TP
+.B delay \fIINTEGER
+The allowance made for round-trip propagation delay of the link in bits.
+The value shall be 0..65535.
+
+.SH EXAMPLE & USAGE
+
+Enable PFC on priorities 6 and 7, leaving the rest intact:
+
+.P
+# 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:
+
+.P
+# dcb pfc set dev eth0 prio-pfc all:off 6:on 7:on delay 0x1000
+
+Show what was set:
+
+.P
+# dcb pfc show dev eth0
+.br
+pfc-cap 8 macsec-bypass off delay 4096
+.br
+prio-pfc 0:off 1:off 2:off 3:off 4:off 5:off 6:on 7:on
+
+.SH EXIT STATUS
+Exit status is 0 if command was successful or a positive integer upon failure.
+
+.SH SEE ALSO
+.BR dcb (8)
+
+.SH REPORTING BUGS
+Report any bugs to the Network Developers mailing list
+.B <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.
+
+.SH AUTHOR
+Petr Machata <me@pmachata.org>