DCB-ETS(8) | Linux | DCB-ETS(8) |
dcb-ets - show / manipulate ETS (Enhanced Transmission Selection) settings of the DCB (Data Center Bridging) subsystem
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 }
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 allocation, 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.
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.
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.
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 is 0 if command was successful or a positive integer upon failure.
Report any bugs to the Network Developers mailing list <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.
Petr Machata <me@pmachata.org>
19 October 2020 | iproute2 |