man: Add a man page for the skbedit action

Cc: Alexander Duyck <alexander.duyck@gmail.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>

diff --git a/man/man8/tc-skbedit.8 b/man/man8/tc-skbedit.8
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+.TH "SKB editing action in tc" 8 "12 Jan 2015" "iproute2" "Linux"
+
+.SH NAME
+skbedit - SKB editing action
+.SH SYNOPSIS
+.in +8
+.ti -8
+.BR tc " ... " "action skbedit " [ " queue_mapping
+.IR QUEUE_MAPPING " ] ["
+.B priority
+.IR PRIORITY " ] ["
+.B mark
+.IR MARK " ]"
+.SH DESCRIPTION
+The
+.B skbedit
+action allows to change a packet's associated meta data. It complements the
+.B pedit
+action, which in turn allows to change parts of the packet data itself.
+.SH OPTIONS
+.TP
+.BI queue_mapping " QUEUE_MAPPING"
+Override the packet's transmit queue. Useful when applied to packets transmitted
+over MQ-capable network interfaces.
+.I QUEUE_MAPPING
+is an unsigned 16bit value in decimal format.
+.TP
+.BI priority " PRIORITY"
+Override the packet classification decision.
+.I PRIORITY
+is either
+.BR root ", " none
+or a hexadecimal major class ID optionally followed by a colon
+.RB ( : )
+and a hexadecimal minor class ID.
+.TP
+.BI mark " MARK"
+Change the packet's firewall mark value.
+.I MARK
+is an unsigned 32bit value in automatically detected format (i.e., prefix with
+.RB ' 0x '
+for hexadecimal interpretation, etc.).
+.SH SEE ALSO
+.BR tc (8),
+.BR tc-pedit (8)