DEVLINK-RATE(8) Linux DEVLINK-RATE(8)
NAME
devlink-rate - devlink rate management
SYNOPSIS
devlink [ OPTIONS ] port function rate { COMMAND | help }
OPTIONS := { -j[son] | -p[retty] | -i[ec] }
devlink port function rate show [ { DEV/PORT_INDEX | DEV/NODE_NAME } ]
devlink port function rate set { DEV/PORT_INDEX | DEV/NODE_NAME } [
tx_share VALUE ] [ tx_max VALUE ] [ tx_priority N ] [ tx_weight
N ] [ { parent NODE_NAME | noparent } ]
devlink port function rate add DEV/NODE_NAME [ tx_share VALUE ] [ tx_max
VALUE ] [ tx_priority N ] [ tx_weight N ] [ { parent NODE_NAME |
noparent } ]
devlink port function rate del DEV/NODE_NAME
devlink port function rate help
DESCRIPTION
devlink port function rate show - display rate objects.
Displays specified rate object or, if not specified, all rate objects.
Rate object can be presented by one of the two types:
leaf Represents a single devlink port; created/destroyed by the dri-
ver and bound to the devlink port. As example, some driver may
create leaf rate object for every devlink port associated with
VF. Since leaf have 1to1 mapping to it's devlink port, in user
space it is referred as corresponding devlink port DEV/PORT_IN-
DEX;
node Represents a group of rate objects; created/deleted by the user
(see command below) and bound to the devlink device rather then
to the devlink port. In userspace it is referred as
DEV/NODE_NAME, where node name can be any, except decimal num-
ber, to avoid collisions with leafs.
Command output show rate object identifier, it's type and rate values
along with parent node name. Rate values printed in SI units which are
more suitable to represent specific value. To print values in IEC units
-i switch is used. JSON (-j) output always print rate values in bytes
per second. Zero rate values means "unlimited" rates and omitted in out-
put, as well as parent node name.
devlink port function rate set - set rate object parameters.
Allows set rate object's parameters. If any parameter specified multiple
times the last occurrence is used.
DEV/PORT_INDEX - specifies devlink leaf rate object.
DEV/NODE_NAME - specifies devlink node rate object.
tx_share VALUE - specifies minimal tx rate value shared among all rate
objects. If rate object is a part of some rate group, then this value
shared with rate objects of this rate group.
tx_max VALUE - specifies maximum tx rate value.
tx_priority N - allows for usage of strict priority arbiter among sib-
lings. This arbitration scheme attempts to schedule nodes based on their
priority as long as the nodes remain within their bandwidth limit. The
higher the priority the higher the probability that the node will get
selected for scheduling.
tx_weight N - allows for usage of Weighted Fair Queuing arbitration
scheme among siblings. This arbitration scheme can be used simultane-
ously with the strict priority. As a node is configured with a higher
rate it gets more BW relative to it's siblings. Values are relative like
a percentage points, they basically tell how much BW should node take
relative to it's siblings.
VALUE These parameter accept a floating point number, possibly fol-
lowed by either a unit (both SI and IEC units supported).
bit or a bare number
Bits per second
kbit Kilobits per second
mbit Megabits per second
gbit Gigabits per second
tbit Terabits per second
bps Bytes per second
kbps Kilobytes per second
mbps Megabytes per second
gbps Gigabytes per second
tbps Terabytes per second
To specify in IEC units, replace the SI prefix (k-, m-, g-, t-)
with IEC prefix (ki-, mi-, gi- and ti-) respectively. Input is
case-insensitive.
N These parameter accept integer meaning weight or priority of a
node.
parent NODE_NAME | noparent - set rate object parent to existing node
with name NODE_NAME or unset parent. Rate limits of the parent node ap-
plied to all it's children. Actual behaviour is details of driver's im-
plementation. Setting parent to empty ("") name due to the kernel logic
treated as parent unset.
devlink port function rate add - create node rate object with specified pa-
rameters.
Creates rate object of type node and sets parameters. Parameters same as
for the "set" command.
DEV/NODE_NAME - specifies the devlink node rate object to create.
devlink port function rate del - delete node rate object
Delete specified devlink node rate object. Node can't be deleted if
there is any child, user must explicitly unset the parent.
DEV/NODE_NAME - specifies devlink node rate object to delete.
devlink port function rate help - display usage information
Display devlink rate usage information
EXAMPLES
* Display all rate objects:
# devlink port function rate show
pci/0000:03:00.0/1 type leaf parent some_group
pci/0000:03:00.0/2 type leaf tx_share 12Mbit
pci/0000:03:00.0/some_group type node tx_share 1Gbps tx_max 5Gbps
* Display leaf rate object bound to the 1st devlink port of the
pci/0000:03:00.0 device:
# devlink port function rate show pci/0000:03:00.0/1
pci/0000:03:00.0/1 type leaf
* Display leaf rate object rate values using IEC units:
# devlink -i port function rate show pci/0000:03:00.0/2
pci/0000:03:00.0/2 type leaf 11718Kibit
* Display node rate object with name some_group of the pci/0000:03:00.0
device:
# devlink port function rate show pci/0000:03:00.0/some_group
pci/0000:03:00.0/some_group type node
* Display pci/0000:03:00.0/2 leaf rate object as pretty JSON output:
# devlink -jp port function rate show pci/0000:03:00.0/2
{
"rate": {
"pci/0000:03:00.0/2": {
"type": "leaf",
"tx_share": 1500000
}
}
}
* Create node rate object with name "1st_group" on pci/0000:03:00.0 de-
vice:
# devlink port function rate add pci/0000:03:00.0/1st_group
* Create node rate object with specified parameters:
# devlink port function rate add pci/0000:03:00.0/2nd_group \
tx_share 10Mbit tx_max 30Mbit parent 1st_group
* Set parameters to the specified leaf rate object:
# devlink port function rate set pci/0000:03:00.0/1 \
tx_share 2Mbit tx_max 10Mbit
* Set leaf's parent to "1st_group":
# devlink port function rate set pci/0000:03:00.0/1 parent 1st_group
* Unset leaf's parent:
# devlink port function rate set pci/0000:03:00.0/1 noparent
* Delete node rate object:
# devlink port function rate del pci/0000:03:00.0/2nd_group
SEE ALSO
devlink(8), devlink-port(8)
AUTHOR
Dmytro Linkin <dlinkin@nvidia.com>
iproute2 12 Mar 2021 DEVLINK-RATE(8)
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