Hi I have been trying to look at the concept of recirculation in OVS. Found an old description by Joe Stringer:
*OVS_ACTION_ATTR_RECIRCULATE:* Open vSwitch datapath interface extension. Not exposed at the OpenFlowlayer.* Datapath interface inserts this action when it needs more informationabout the packet, part way through rule processing.* Commits all packet modifications and tells the datapath to re-insert thepacket with an ID (skb_mark) attached.* Re-inserted packets go through the standard parse/lookup/upcall procedure* Upcall uses the skb_mark to continue rule processing where therecirculate happened* This allows the datapath to re-parse a packet and provide moreinformation part way through rule-processingThe goal of in-kernel recirculation is to allow the kernel to do morethan one flow lookup for a single packet. The initial use case is forMPLS support. I don't know the details.* What are the current scenarios in which a re-circulation happens in the datapath? Would appreciate an exhaustive list if possible? I believe sending the packet to conntrack for lookup / commit would cause a recirc? Thanks, Ashish. -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. If you received this e-mail in error, please return the e-mail to the sender, delete it from your computer, and destroy any printed copy of it.
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