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DCB-ETS(8) Linux DCB-ETS(8)
NAME
dcb-ets - show / manipulate ETS (Enhanced Transmission Selection) settings of the DCB
(Data Center Bridging) subsystem
SYNOPSIS
dcb [ OPTIONS ] ets { COMMAND | help }
dcb ets show dev DEV [ willing ] [ ets-cap ] [ cbs ] [ tc-tsa ] [ reco-tc-tsa ] [ pg-bw ]
[ tc-bw ] [ reco-tc-bw ] [ prio-tc ] [ reco-prio-tc ]
dcb ets set dev DEV [ willing { on | off } ] [ { tc-tsa | reco-tc-tsa } TSA-MAP ] [ { pg-
bw | tc-bw | reco-tc-bw } BW-MAP ] [ { prio-tc | reco-prio-tc } PRIO-MAP ]
TSA-MAP := [ TSA-MAP ] TSA-MAPPING
TSA-MAPPING := { TC | all }:{ strict | cbs | ets | vendor }
BW-MAP := [ BW-MAP ] BW-MAPPING
BW-MAPPING := { TC | all }:INTEGER
PRIO-MAP := [ PRIO-MAP ] PRIO-MAPPING
PRIO-MAPPING := { PRIO | all }:TC
TC := { 0 .. 7 }
PRIO := { 0 .. 7 }
DESCRIPTION
dcb ets is used to configure Enhanced Transmission Selection attributes through Linux DCB
(Data Center Bridging) interface. ETS permits configuration of mapping of priorities to
traffic classes, traffic selection algorithm to use per traffic class, bandwidth alloca-
tion, etc.
Two DCB TLVs are related to the ETS feature: a configuration and recommendation values.
Recommendation values are named with a prefix reco-, while the configuration ones have
plain names.
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 ETS configuration.
ets-cap
A read-only property that shows the number of supported ETS traffic classes.
cbs A read-only property that is enabled if the driver and the hardware support the CBS
Transmission Selection Algorithm.
willing { on | off }
Whether local host should accept configuration from peer TLVs.
prio-tc PRIO-MAP
reco-prio-tc PRIO-MAP
PRIO-MAP uses the array parameter syntax, see dcb(8) for details. Keys are priori-
ties, values are traffic classes. For each priority sets a TC where traffic with
that priority is directed to.
tc-tsa TSA-MAP
reco-tc-tsa TSA-MAP
TSA-MAP uses the array parameter syntax, see dcb(8) for details. Keys are TCs, val-
ues are Transmission Selection Algorithm (TSA) keywords described below. For each
TC sets an algorithm used for deciding how traffic queued up at this TC is sched-
uled for transmission. Supported TSAs are:
strict - for strict priority, where traffic in higher-numbered TCs always takes
precedence over traffic in lower-numbered TCs.
ets - for Enhanced Traffic Selection, where available bandwidth is distributed
among the ETS-enabled TCs according to the weights set by tc-bw and reco-tc-bw, re-
spectively.
cbs - for Credit Based Shaper, where traffic is scheduled in a strict manner up to
the limit set by a shaper.
vendor - for vendor-specific traffic selection algorithm.
tc-bw BW-MAP
reco-tc-bw BW-MAP
BW-MAP uses the array parameter syntax, see dcb(8) for details. Keys are TCs, val-
ues are integers representing percent of available bandwidth given to the traffic
class in question. The value should be 0 for TCs whose TSA is not ets, and the sum
of all values shall be 100. As an exception to the standard wording, a configura-
tion with no ets TCs is permitted to sum up to 0 instead.
pg-bw BW-MAP
The precise meaning of pg-bw is not standardized, but the assumption seems to be
that the same scheduling process as on the transmit side is applicable on receive
side as well, and configures receive bandwidth allocation for ets ingress traffic
classes (priority groups).
EXAMPLE & USAGE
Configure ETS priomap in a one-to-one fashion:
# dcb ets set dev eth0 prio-tc 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
Set TSA and transmit bandwidth configuration:
# dcb ets set dev eth0 tc-tsa all:strict 0:ets 1:ets 2:ets \
tc-bw all:0 0:33 1:33 2:34
Show what was set:
# dcb ets show dev eth0 prio-tc tc-tsa tc-bw
prio-tc 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
tc-tsa 0:ets 1:ets 2:ets 3:strict 4:strict 5:strict 6:strict 7:strict
tc-bw 0:33 1:33 2:34 3:0 4:0 5:0 6:0 7:0
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 19 October 2020 DCB-ETS(8)
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