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You can configure an Ethernet network attachment for an Single Root I/O Virtualization (SR-IOV) device in the cluster.

Ethernet device configuration object

You can configure an Ethernet network device by defining an SriovNetwork object.

The following YAML describes an SriovNetwork object:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: <name> (1)
  namespace: openshift-sriov-network-operator (2)
spec:
  resourceName: <sriov_resource_name> (3)
  networkNamespace: <target_namespace> (4)
  vlan: <vlan> (5)
  spoofChk: "<spoof_check>" (6)
  ipam: |- (7)
    {}
  linkState: <link_state> (8)
  maxTxRate: <max_tx_rate> (9)
  minTxRate: <min_tx_rate> (10)
  vlanQoS: <vlan_qos> (11)
  trust: "<trust_vf>" (12)
  capabilities: <capabilities> (13)
1 A name for the object. The SR-IOV Network Operator creates a NetworkAttachmentDefinition object with same name.
2 The namespace where the SR-IOV Network Operator is installed.
3 The value for the spec.resourceName parameter from the SriovNetworkNodePolicy object that defines the SR-IOV hardware for this additional network.
4 The target namespace for the SriovNetwork object. Only pods in the target namespace can attach to the additional network.
5 Optional: A Virtual LAN (VLAN) ID for the additional network. The integer value must be from 0 to 4095. The default value is 0.
6 Optional: The spoof check mode of the VF. The allowed values are the strings "on" and "off".

You must enclose the value you specify in quotes or the object is rejected by the SR-IOV Network Operator.

7 A configuration object for the IPAM CNI plug-in as a YAML block scalar. The plug-in manages IP address assignment for the attachment definition.
8 Optional: The link state of virtual function (VF). Allowed value are enable, disable and auto.
9 Optional: A maximum transmission rate, in Mbps, for the VF.
10 Optional: A minimum transmission rate, in Mbps, for the VF. This value must be less than or equal to the maximum transmission rate.

Intel NICs do not support the minTxRate parameter. For more information, see BZ#1772847.

11 Optional: An IEEE 802.1p priority level for the VF. The default value is 0.
12 Optional: The trust mode of the VF. The allowed values are the strings "on" and "off".

You must enclose the value that you specify in quotes, or the SR-IOV Network Operator rejects the object.

13 Optional: The capabilities to configure for this additional network. You can specify "{ "ips": true }" to enable IP address support or "{ "mac": true }" to enable MAC address support.

Configuration of IP address assignment for an additional network

The IP address management (IPAM) Container Network Interface (CNI) plug-in provides IP addresses for other CNI plug-ins.

You can use the following IP address assignment types:

  • Static assignment.

  • Dynamic assignment through a DHCP server. The DHCP server you specify must be reachable from the additional network.

  • Dynamic assignment through the Whereabouts IPAM CNI plug-in.

Static IP address assignment configuration

The following table describes the configuration for static IP address assignment:

Table 1. ipam static configuration object
Field Type Description

type

string

The IPAM address type. The value static is required.

addresses

array

An array of objects specifying IP addresses to assign to the virtual interface. Both IPv4 and IPv6 IP addresses are supported.

routes

array

An array of objects specifying routes to configure inside the pod.

dns

array

Optional: An array of objects specifying the DNS configuration.

The addresses array requires objects with the following fields:

Table 2. ipam.addresses[] array
Field Type Description

address

string

An IP address and network prefix that you specify. For example, if you specify 10.10.21.10/24, then the additional network is assigned an IP address of 10.10.21.10 and the netmask is 255.255.255.0.

gateway

string

The default gateway to route egress network traffic to.

Table 3. ipam.routes[] array
Field Type Description

dst

string

The IP address range in CIDR format, such as 192.168.17.0/24 or 0.0.0.0/0 for the default route.

gw

string

The gateway where network traffic is routed.

Table 4. ipam.dns object
Field Type Description

nameservers

array

An of array of one or more IP addresses for to send DNS queries to.

domain

array

The default domain to append to a hostname. For example, if the domain is set to example.com, a DNS lookup query for example-host is rewritten as example-host.example.com.

search

array

An array of domain names to append to an unqualified hostname, such as example-host, during a DNS lookup query.

Static IP address assignment configuration example
{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7"
        }
      ]
  }
}

Dynamic IP address (DHCP) assignment configuration

The following JSON describes the configuration for dynamic IP address address assignment with DHCP.

Renewal of DHCP leases

A pod obtains its original DHCP lease when it is created. The lease must be periodically renewed by a minimal DHCP server deployment running on the cluster.

The SR-IOV Network Operator does not create a DHCP server deployment; The Cluster Network Operator is responsible for creating the minimal DHCP server deployment.

To trigger the deployment of the DHCP server, you must create a shim network attachment by editing the Cluster Network Operator configuration, as in the following example:

Example shim network attachment definition
apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...
Table 5. ipam DHCP configuration object
Field Type Description

type

string

The IPAM address type. The value dhcp is required.

Dynamic IP address (DHCP) assignment configuration example
{
  "ipam": {
    "type": "dhcp"
  }
}

Dynamic IP address assignment configuration with Whereabouts

The Whereabouts CNI plug-in allows the dynamic assignment of an IP address to an additional network without the use of a DHCP server.

The following table describes the configuration for dynamic IP address assignment with Whereabouts:

Table 6. ipam whereabouts configuration object
Field Type Description

type

string

The IPAM address type. The value whereabouts is required.

range

string

An IP address and range in CIDR notation. IP addresses are assigned from within this range of addresses.

exclude

array

Optional: A list of zero ore more IP addresses and ranges in CIDR notation. IP addresses within an excluded address range are not assigned.

Dynamic IP address assignment configuration example that uses Whereabouts
{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

Configuring SR-IOV additional network

You can configure an additional network that uses SR-IOV hardware by creating a SriovNetwork object. When you create a SriovNetwork object, the SR-IOV Operator automatically creates a NetworkAttachmentDefinition object.

Do not modify or delete a SriovNetwork object if it is attached to any pods in the running state.

Prerequisites
  • Install the OpenShift CLI (oc).

  • Log in as a user with cluster-admin privileges.

Procedure
  1. Create a SriovNetwork object, and then save the YAML in the <name>.yaml file, where <name> is a name for this additional network. The object specification might resemble the following example:

    apiVersion: sriovnetwork.openshift.io/v1
    kind: SriovNetwork
    metadata:
      name: attach1
      namespace: openshift-sriov-network-operator
    spec:
      resourceName: net1
      networkNamespace: project2
      ipam: |-
        {
          "type": "host-local",
          "subnet": "10.56.217.0/24",
          "rangeStart": "10.56.217.171",
          "rangeEnd": "10.56.217.181",
          "gateway": "10.56.217.1"
        }
  2. To create the object, enter the following command:

    $ oc create -f <name>.yaml

    where <name> specifies the name of the additional network.

  3. Optional: To confirm that the NetworkAttachmentDefinition object that is associated with the SriovNetwork object that you created in the previous step exists, enter the following command. Replace <namespace> with the networkNamespace you specified in the SriovNetwork object.

    $ oc get net-attach-def -n <namespace>