отображение / управление таблицей приоритетов приложений подсистемы DCB (Data Center Bridging) (show / manipulate application priority table of the DCB (Data Center Bridging) subsystem)
Имя (Name)
dcb-app - show / manipulate application priority table of the DCB
(Data Center Bridging) subsystem
Синопсис (Synopsis)
dcb [ OPTIONS ] app { COMMAND | help }
dcb app { show | flush } dev DEV [ default-prio ] [
ethtype-prio ] [ stream-port-prio ] [ dgram-port-prio ] [
port-prio ] [ dscp-prio ]
dcb ets { add | del | replace } dev DEV [ default-prio
PRIO-LIST ] [ ethtype-prio ET-MAP ] [ stream-port-prio
PORT-MAP ] [ dgram-port-prio PORT-MAP ] [ port-prio PORT-
MAP ] [ dscp-prio DSCP-MAP ]
PRIO-LIST := [ PRIO-LIST ] PRIO
ET-MAP := [ ET-MAP ] ET-MAPPING
ET-MAPPING := ET:PRIO
PORT-MAP := [ PORT-MAP ] PORT-MAPPING
PORT-MAPPING := PORT:PRIO
DSCP-MAP := [ DSCP-MAP ] DSCP-MAPPING
DSCP-MAPPING := { DSCP | all }:PRIO
ET := { 0x600 .. 0xffff }
PORT := { 1 .. 65535 }
DSCP := { 0 .. 63 }
PRIO := { 0 .. 7 }
Описание (Description)
dcb app is used to configure APP table, or application priority
table in the DCB (Data Center Bridging) subsystem. The APP table
is used to assign priority to traffic based on value in one of
several headers: EtherType, L4 destination port, or DSCP. It also
allows configuration of port-default priority that is chosen if
no other prioritization rule applies.
DCB APP entries are 3-tuples of selector, protocol ID, and
priority. Selector is an enumeration that picks one of the
prioritization namespaces. Currently it mostly corresponds to
configurable parameters described below. Protocol ID is a value
in the selector namespace. E.g. for EtherType selector, protocol
IDs are the individual EtherTypes, for DSCP they are individual
code points. The priority is the priority that should be assigned
to traffic that matches the selector and protocol ID.
The APP table is a set of DCB APP entries. The only requirement
is that duplicate entries are not added. Notably, it is valid to
have conflicting priority assignment for the same selector and
protocol ID. For example, the set of two APP entries (DSCP, 10,
1) and (DSCP, 10, 2), where packets with DSCP of 10 should get
priority of both 1 and 2, form a well-defined APP table. The dcb
app tool allows low-level management of the app table by adding
and deleting individual APP 3-tuples through add and del
commands. On the other other hand, the command replace does what
one would typically want in this situation--first adds the new
configuration, and then removes the obsolete one, so that only
one prioritization is in effect for a given selector and protocol
ID.
Команды (Commands)
show Display all entries with a given selector. When no
selector is given, shows all APP table entries categorized
per selector.
flush Remove all entries with a given selector. When no selector
is given, removes all APP table entries.
add
del Add and, respectively, remove individual APP 3-tuples to
and from the DCB APP table.
replace
Take the list of entries mentioned as parameter, and add
those that are not present in the APP table yet. Then
remove those entries, whose selector and protocol ID have
been mentioned as parameter, but not with the exact same
priority. This has the effect of, for the given selector
and protocol ID, causing that the table only contains the
priority (or priorities) given as parameter.
Параметры (Parameters)
The following table shows parameters in a way that they would be
used with add, del and replace commands. For show and flush, the
parameter name is to be used as a simple keyword without further
arguments.
default-prio PRIO-LIST
The priority to be used for traffic the priority of which
is otherwise unspecified. The argument is a list of
individual priorities. Note that default-prio rules are
configured as triplets (EtherType, 0, PRIO). dcb app
translates these rules to the symbolic name default-prio
and back.
ethtype-prio ET-MAP
ET-MAP uses the array parameter syntax, see dcb(8) for
details. Keys are EtherType values. Values are priorities
to be assigned to traffic with the matching EtherType.
stream-port-prio PORT-MAP
dgram-port-prio PORT-MAP
port-prio PORT-MAP
PORT-MAP uses the array parameter syntax, see dcb(8) for
details. Keys are L4 destination port numbers that match
on, respectively, TCP and SCTP traffic, UDP and DCCP
traffic, and either of those. Values are priorities that
should be assigned to matching traffic.
dscp-prio DSCP-MAP
DSCP-MAP uses the array parameter syntax, see dcb(8) for
details. Keys are DSCP points, values are priorities
assigned to traffic with matching DSCP. DSCP points can be
written either direcly as numeric values, or using
symbolic names specified in /etc/iproute2/rt_dsfield
(however note that that file specifies full 8-bit dsfield
values, whereas dcb app will only use the higher six
bits). dcb app show will similarly format DSCP values as
symbolic names if possible. The command line option -N
turns the show translation off.
Примеры (Examples)
Prioritize traffic with DSCP 0 to priority 0, 24 to 3 and 48 to
6:
# dcb app add dev eth0 dscp-prio 0:0 24:3 48:6
Add another rule to configure DSCP 24 to priority 2 and show the
result:
# dcb app add dev eth0 dscp-prio 24:2
# dcb app show dev eth0 dscp-prio
dscp-prio 0:0 CS3:2 CS3:3 CS6:6
# dcb -N app show dev eth0 dscp-prio
dscp-prio 0:0 24:2 24:3 48:6
Reconfigure the table so that the only rule for DSCP 24 is for
assignment of priority 4:
# dcb app replace dev eth0 dscp-prio 24:4
# dcb app show dev eth0 dscp-prio
dscp-prio 0:0 24:4 48:6
Flush all DSCP rules:
# dcb app flush dev eth0 dscp-prio
# dcb app show dev eth0 dscp-prio
(nothing)
Статус выхода (Exit)
Exit status is 0 if command was successful or a positive integer
upon failure.
Смотри также (See also)
dcb(8)
Сообщение об ошибках (Reporting bugs)
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.
