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Error and Flow Control Protocol (EFCP) Design and Implementation: A Data Transfer Protocol for the Recursive Internet Architecture
- 1. Error and Flow Control Protocol (EFCP) Design and Implementation: A Data Transfer Protocol for the Recursive InterNetwork Architecture Miquel Tarzan* Eduard Grasa Leonardo Bergesio ed forty conferences upon people who had not made me any harm” G.K. Chesterton on his trip to the US
- 2. Outline • A glimpse at EFCP (and thus at Delta-t) • EFCP ImplementaNon • Data structures • Workflows • Experiments • Where have we tried this data transfer protocol? • CongesNon control in FP7 PRISTINE • RINA-based IP VPN experiments • Conclusions and quesNons
- 3. A glimpse at EFCP: Structure and Place in RINA • Data transfer • Seq numbers • Ordering • Data transfer control • Flow control • Rtx control • Policies for CongesNon control • Explicit CongesNon NoNficaNon Bit(s) • State Vector • Keeps both funcNons coordinated IPC API Data Transfer Data Transfer Control Layer Management SDU Delimi9ng Data Transfer Relaying and Mul9plexing SDU Protec9on Retransmission Control Flow Control RIB Daemon RIB CDAP Parser/ Generator CACEP Enrollment Flow Alloca9on Resource Alloca9on Rou9ng Authen9ca9on State Vector State Vector State Vector Data Transfer Data Transfer Retransmission Control Retransmission Control Flow Control Flow Control Increasing 9mescale (func9ons performed less oIen) and complexity Namespace Management Security Management
- 4. A glimpse at EFCP: Timers for Reliability ∆ 𝑡 parameter for inacNvity Nmers ∆ 𝑡= 𝑀𝑃𝐿+ 𝐴+ 𝑅 EFCP’s Nmers MPL LifeNme of PDUs A Timer for ACKs R Timer to stop RTXs 3 ∆ 𝑡 Sndr InacNvity Timer 2 ∆ 𝑡 Rcvr InacNvity Timer Bounded, thus Reliability Guaranteed
- 5. Implementation of EFCP: PCI Data Structures struct pci { unsigned char *h; size_t len; }; struct du { struct efcp_config *cfg; struct pci pci; void *sdup_head; void *sdup_tail; struct sk_buff *skb; };
- 6. Implementation of EFCP: Its data structures EFCP Container EFCP instance DTP Instance DTP Policy Set DTCP Instance DTCP Policy Set State Vector Instance CWQ SeqQ sndrLWE, rcvrRWE, ... RTXQ A-Timer Rtx Timer
- 7. mplementation of EFCP: PCI Data Dst Addr Src Addr Dst CEP- Id Src CEP-Id QoS-Id Ctrl Seq Num sndRWE rcvRWE PDU type Dst Addr Src Addr Dst CEP- Id Src CEP-Id QoS-Id Seq Num DRF ECN PDU type Data Transfer PCI (Data PDU) Data Transfer Control PCI (Control PDU) sndLWE …
- 8. Implementation of EFCP: Functions • It has to work in DIFs very different one from another, thus the mechanisms must be decoupled so they can be used independently EFCP instance DTP Sequence numbers DTCP Flow control Ordering No duplicaNons Rtx Control CongesNon Control
- 9. Workflows: Design & APIctrl_device (user space) efcp_connec(on_create efcp_connec(on_destroy IPCP or KFA efcp_container_write(sk_buff) ipcp_enqueue(sk_buff, port_id) RMT Instance rmt_send(sk_buff) EFCP Container EFCP instance DTP Instance DTP Policy Set DTCP Instance DTCP Policy Set State Vector Instance CWQ SeqQ sndrLWE, rcvrRWE, ... RTXQ A-Timer Rtx Timer efcp_receive(sk_buff)
- 10. EFCP Workflows: Loading the policy sets :IraNStack plugin:LKM dtp:dtp_ps insmod mmod dtp_ps_publish select_policy_set create <<create>> transmission_control reconcile_conflict select_policy_set destroy <<destroy>> dtp_ps_unpublish
- 11. Workflows: Flow Allocation & Synchronisation • EFCP doesn’t carry out flow allocaNon • Task of Flow Allocator • EFCP takes on data transfer iniNalisaNon: DRF
- 12. Experiments: Congestion Control • In FP7 PRISTINE policies for CC were invesNgated • Applied to the network of a distributed cloud provider • Custom policy sets for EFCP and RMT • 2 CC soluNons based on the ECN and window-based flow-control • The RMT monitors its queues and if they grow too long ECN flag is raised • EFCP reduces or increases the credit depending on ECN marks
- 13. Experiments: RINA-based IP VPN Green customer CPE (IP) Blue customer CPE (IP) Purple customer CPE (IP) Orange customer CPE (IP) Red customer CPE (IP) Pink customer CPE (IP) Provider network (RINA-based) CR CR CR PE PE PE PE PE PEPE PE PEPE CE PE CR CE CE CE CE CECE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE CE PE CRCR PEPE CECE Ethernet Ethernet EthernetEthernet Ethernet Backbone DIF IP (Green customer IP VPN) Experimental details • Medium scale scen • 40 physical nodes • Up to 6 DIFs • 1000+ concurrent fl Remarkable results: • Performance achieved by prototype was closed to rate 1 Gbps physical NICs mulNple aggragated flow
- 14. Conclusions • IT WORKS! • The design fulfills the requirements laid out in the specificaNon • The implementaNon is reasonably performant • Not the work of fools