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Software lag switch activation code software#
This would make sure that when flow is programmed it would be programmed on both hardware and software data path.
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Also this is the default option if tc-policy is not explicitly configured. We are required to apply below config on ovs. TC flower is an iproute2 utility and used to write data path flows on hardware. Ovs uses TC data path when hw-offload flag is enabled. We are required to apply the following configuration on ovs in order to enable hardware offload. Once all flows pertaining to a particular traffic stream are formed, ovs will use TC flower utility to push and program these flows on NIC hardware. The first traverse enables the ml2 ovs to figure out rules for incoming/outgoing packets for the instance traffic. Please refer to the “Packet journey” section for graphical representation. In an offload environment, the first packet traverses through the ovs kernel data path. $ openstack port create –network private –vnic-type=direct –binding-profile ‘’ direct_port1Īdmin pass this port information while creating the instance.Representator port gets associated with instance VF interface and plugged to ovs bridge br-int for one time ovs datapath processing. In order to allocate a port from switchdev enabled NIC, neutron port needs to be created with a binding profile mentioning capabilities as below. Representator ports are plugged into the host and take packets to and from VFs to the kernel switching. This would create representor ports on NIC and are mapped/corresponds to each created VFs. When offload enabled, NIC e-switch mode changes to “switchdev”. Os-vif would figure out the representor port name which is mapped to VF port plugged to VM and plugs representor port to br-int. Nova scheduler should be configured to use the PciPassthroughFilter and Nova compute should be configured with passthrough_whitelist. Nova scheduler doesn’t have any changes while dealing with offload feature and behaves the same as SR-IOV pass through for instance spawning.
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