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DCB-ETS(8)                           Linux                          DCB-ETS(8)
NAME
       dcb-ets  - show / manipulate ETS (Enhanced Transmission Selection) set-
       tings 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 config-
       uration of mapping of priorities to traffic classes, traffic selection
       algorithm to use per traffic class, bandwidth allocation, etc.
       Two DCB TLVs are related to the ETS feature: a configuration and recom-
       mendation 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 argu-
       ments. This instructs the tool to show the value of a given parameter.
       When no parameters are given, the tool shows the complete ETS configu-
       ration.
       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 hard-
              ware 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 priorities, 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, values 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 scheduled 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, respectively.
              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, values are integers representing percent of avail-
              able 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
              configuration 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 <net-
       dev 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)