MACsec Intel® FPGA IP User Guide

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ID 736108
Date 10/02/2023
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Document Table of Contents
Document Table of Contents x
1. Introduction 2. Interface Overview 3. Parameters 4. Designing with the IP Core 5. Functional Description 6. Configuration Registers for MACsec IP 7. MACsec Intel® FPGA IP Example Design 8. MACsec Intel FPGA IP User Guide Archives 9. Document Revision History for the MACsec Intel FPGA IP User Guide
1. Introduction x
1.1. Terminology 1.2. IP Core Overview 1.3. Release Information 1.4. Device Family Support 1.5. Device Speed Grade Support and Theoretical Throughput 1.6. Resource Utilization
1.2. IP Core Overview x
1.2.1. IP Description 1.2.2. IP Core Applications
1.2.2. IP Core Applications x
1.2.2.1. SmartNIC 1.2.2.2. Ethernet Bridge + Inline MACsec
2. Interface Overview x
2.1. Block Diagram 2.2. Interfaces 2.3. Clocking Domains
2.2. Interfaces x
2.2.1. IP Interface Signals 2.2.2. IP Interface Signal Timing Diagram/Waveforms 2.2.3. Clocks, Resets, and Interrupts
2.2.1. IP Interface Signals x
2.2.1.1. Common Port Mux Interface 2.2.1.2. Common Port Demux Interface 2.2.1.3. Controlled Port Mux Interface 2.2.1.4. Controlled Port Demux Interface 2.2.1.5. Uncontrolled Port RX Interface 2.2.1.6. Uncontrolled Port TX Interface 2.2.1.7. Management Interface 2.2.1.8. Decrypt Port Mux Management Interface 2.2.1.9. Decrypt Port Demux Management Interface 2.2.1.10. Encrypt Port Mux Management Interface 2.2.1.11. Encrypt Port Demux Management Interface 2.2.1.12. Crypto IP Management Bus 2.2.1.13. Miscellaneous Control Signals
2.2.2. IP Interface Signal Timing Diagram/Waveforms x
2.2.2.1. Common Port Mux Interface Waveform 2.2.2.2. Common Port Demux Interface Waveform 2.2.2.3. Controlled Port Mux Interface Waveform 2.2.2.4. Controlled Port Demux Interface Waveform 2.2.2.5. Uncontrolled Port RX Interface Waveform 2.2.2.6. Uncontrolled Port TX Interface Waveform 2.2.2.7. Crypto RX Waveform 2.2.2.8. Crypto TX Waveform 2.2.2.9. MACsec Management Interface (Read) 2.2.2.10. MACsec Management Interface (Write)
3. Parameters x
3.1. MACsec Intel FPGA IP Parameter Settings
4. Designing with the IP Core x
4.1. Installing and Licensing Intel® FPGA IP Cores 4.2. Specifying the IP Core Parameters and Options 4.3. Generated File Structure 4.4. Reset Transactions 4.5. MACsec Software Initialization Sequence
4.1. Installing and Licensing Intel® FPGA IP Cores x
4.1.1. Intel® FPGA IP Evaluation Mode
5. Functional Description x
5.1. AXI-ST Common/Controlled/Uncontrolled Ports 5.2. Packet Parser and Classifier 5.3. SA Lookup and Update 5.4. Encryption Framer/DeFramer 5.5. Decryption Framer/Deframer 5.6. Packet Aggregator/Disaggregator 5.7. Cryptographic AES 5.8. Error Handling 5.9. Packet Statistics
5.1. AXI-ST Common/Controlled/Uncontrolled Ports x
5.1.1. AXI-ST Single Packet Mode 5.1.2. AXI-ST Multi Packet Mode 5.1.3. User Interface Data Streaming 5.1.4. AXI-ST Ready Latency 5.1.5. Port and Secure Channel Mapping 5.1.6. Port and Crypto Channel Mapping 5.1.7. Minimum Packet Size 5.1.8. Byte Ordering 5.1.9. Controlled/Uncontrolled Port Muxing
5.1.3. User Interface Data Streaming x
5.1.3.1. Single Packet Mode Data Stream 5.1.3.2. Multi Packet Mode Data Stream
5.2. Packet Parser and Classifier x
5.2.1. Packet Parser 5.2.2. Packet Classifier
5.3. SA Lookup and Update x
5.3.1. Packet Actions 5.3.2. Packet Buffer 5.3.3. New Channel Assignment 5.3.4. Anti-Replay Protection
5.3.1. Packet Actions x
5.3.1.1. Packet Encrypt 5.3.1.2. Packet Decrypt 5.3.1.3. Packet Discard 5.3.1.4. PDU Validation
5.4. Encryption Framer/DeFramer x
5.4.1. Channel Allocation 5.4.2. Packet Framer 5.4.3. VLAN Tagging
5.4.2. Packet Framer x
5.4.2.1. Bypass Packet 5.4.2.2. Stream Interleaving
5.4.3. VLAN Tagging x
5.4.3.1. No VLAN Tag 5.4.3.2. VLAN Tag (Not in Clear) 5.4.3.3. VLAN Tag (Clear)
5.5. Decryption Framer/Deframer x
5.5.1. XPN Recovery 5.5.2. Replay Check Update 5.5.3. Packet Deframer
5.6. Packet Aggregator/Disaggregator x
5.6.1. Packet Aggregator 5.6.2. Packet Disaggregator
5.7. Cryptographic AES x
5.7.1. Register Address Ordering 5.7.2. Byte Order Swapping 5.7.3. Byte Ordering
5.8. Error Handling x
5.8.1. Packet Error Handling 5.8.2. Memory Blocks ECC Errors 5.8.3. Crypto Errors 5.8.4. System-Level Errors
7. MACsec Intel® FPGA IP Example Design x
7.1. Simulation Requirements 7.2. Steps to Run Simulation 7.3. Port Configurations 7.4. Multi Interface Buffering Muxing/Demuxing 7.5. 2x25 GbE (Encryption + Decryption) 7.6. Packet Generator/Checker 7.7. Clocking
1. Introduction
2. Interface Overview
3. Parameters
4. Designing with the IP Core
5. Functional Description
6. Configuration Registers for MACsec IP
7. MACsec Intel® FPGA IP Example Design
8. MACsec Intel FPGA IP User Guide Archives
9. Document Revision History for the MACsec Intel FPGA IP User Guide

5.1.9. Controlled/Uncontrolled Port Muxing

The diagram below shows the arbitration mux between the Controlled and Uncontrolled ports on the Tx encryption lane. The Uncontrolled port traffic is directly taken from the user while the Controlled port traffic is output from the Encryption Deframer block.
Figure 23. Controlled/Uncontrolled Port Muxing


The Encryption Deframer output can interleave 64-byte words from different streams. The Uncontrolled port traffic requirements are specified below.

Table 36.  Uncontrolled Port Traffic Requirement
Cycle 0 1 2 3 4 5 6
Stream 0 0 3 3 4 7 7
Data[127:0] SOP EOP SOP Data SOP SOP Data
Data[255:128] Data IDLE Data Data Data Data EOP
Data[383:256] Data IDLE Data Data Data Data IDLE
Data[511:384] Data IDLE Data EOP EOP Data IDLE
  • Packet based per stream
  • Single Packet Mode only
  • No interleaving of packets with different stream packet
  • The arbitration between the Uncontrolled and Controlled ports follows the following criteria.
  • Priority is for the controlled port following these rules:
    • Traffic from the Uncontrolled port is not granted when the Controlled port has incoming traffic.
    • Traffic from the Uncontrolled port is not granted when the Controlled port traffic targeting the same stream as the Uncontrolled Port is not reaching EOP.
    • Traffic from the Uncontrolled port is not granted when the Controlled port traffic targeting the same stream as the Uncontrolled port is reaching EOP but there is another SOP within the same cycle.
    • Traffic from the Uncontrolled port is granted when the Controlled port traffic reaches EOP and none of the above is met.
  • For use cases where both the controlled port and the uncontrolled port are required to be active, neither port meets the line rate.
  • The E- or F-tile Ethernet IP requires that tvalid be continuously asserted between the assertions of the "start-of-packet" and "end-of-packet" signals for the same packet. This places a restriction that the port demux be in "store and forward" (STFD) mode. For small packets (of the order of the minimum packet size), STFD may introduce a performance limitation because two packets in the same line (multi-packet scenario) should be read out on different clock cycles (making it a single-packet scenario).
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