MACsec Intel® FPGA IP User Guide

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ID 736108
Date 10/21/2022
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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. MACsec Intel® FPGA IP Example Design 6. Functional Description 7. Configuration Registers for MACsec IP 8. 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. Crypto RX Interface 2.2.1.8. Crypto TX Interface 2.2.1.9. Management Interface 2.2.1.10. Decrypt Port Mux Management Interface 2.2.1.11. Decrypt Port Demux Management Interface 2.2.1.12. Encrypt Port Mux Management Interface 2.2.1.13. Encrypt Port Demux Management Interface 2.2.1.14. Crypto IP Management Bus
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 4.6. MACsec Software Rekeying
4.1. Installing and Licensing Intel® FPGA IP Cores x
4.1.1. Intel® FPGA IP Evaluation Mode
5. MACsec Intel® FPGA IP Example Design x
5.1. Port Configurations 5.2. Multi Interface Buffering Muxing/Demuxing 5.3. 2x25 GbE (Encryption + Decryption) 5.4. Packet Generator/Checker 5.5. Clocking
6. Functional Description x
6.1. AXI-ST Common/Controlled/Uncontrolled Ports 6.2. Packet Parser and Classifier 6.3. SA Lookup and Update 6.4. Encryption Framer/DeFramer 6.5. Decryption Framer/Deframer 6.6. Packet Aggregator/Disaggregator 6.7. Cryptographic AES 6.8. Error Handling 6.9. Packet Statistics
6.1. AXI-ST Common/Controlled/Uncontrolled Ports x
6.1.1. AXI-ST Single Packet Mode 6.1.2. AXI-ST Multi Packet Mode 6.1.3. User Interface Data Streaming 6.1.4. AXI-ST Ready Latency 6.1.5. Port and Secure Channel Mapping 6.1.6. Port and Crypto Channel Mapping 6.1.7. Minimum Packet Size 6.1.8. Byte Ordering 6.1.9. Controlled/Uncontrolled Port Muxing
6.1.3. User Interface Data Streaming x
6.1.3.1. Single Packet Mode Data Stream 6.1.3.2. Multi Packet Mode Data Stream
6.2. Packet Parser and Classifier x
6.2.1. Packet Parser 6.2.2. Packet Classifier
6.3. SA Lookup and Update x
6.3.1. Packet Actions 6.3.2. Packet Buffer 6.3.3. New Channel Assignment 6.3.4. Anti-Replay Protection
6.3.1. Packet Actions x
6.3.1.1. Packet Encrypt 6.3.1.2. Packet Decrypt 6.3.1.3. Packet Discard
6.3.1.3. Packet Discard x
6.3.1.3.1. PDU Validation
6.4. Encryption Framer/DeFramer x
6.4.1. Channel Allocation 6.4.2. Packet Framer 6.4.3. VLAN Tagging
6.4.2. Packet Framer x
6.4.2.1. Bypass Packet 6.4.2.2. Stream Interleaving
6.4.3. VLAN Tagging x
6.4.3.1. No VLAN Tag 6.4.3.2. VLAN Tag (Not in Clear) 6.4.3.3. VLAN Tag (Clear)
6.5. Decryption Framer/Deframer x
6.5.1. XPN Recovery 6.5.2. Replay Check Update 6.5.3. Packet Deframer
6.6. Packet Aggregator/Disaggregator x
6.6.1. Packet Aggregator 6.6.2. Packet Disaggregator
6.7. Cryptographic AES x
6.7.1. Register Address Ordering 6.7.2. Byte Order Swapping 6.7.3. Byte Ordering
6.8. Error Handling x
6.8.1. Packet Error Handling 6.8.2. Memory Blocks ECC Errors 6.8.3. Crypto Errors 6.8.4. System-Level Errors
1. Introduction
2. Interface Overview
3. Parameters
4. Designing with the IP Core
5. MACsec Intel® FPGA IP Example Design
6. Functional Description
7. Configuration Registers for MACsec IP
8. Document Revision History for the MACsec Intel FPGA IP User Guide

6.4.2.1. Bypass Packet

During the MACsec secure frame verification check, there are a few cases where the IP can bypass the whole Crypto process and redirect the packet to the Controlled port. For example, when there is no SA found for the packet and the validateFrames is not equal to STRICT.

In order to simplify the MACsec IP implementation, the MACsec IP sends the packet with the AAD_Len = FFFF_FFFF. The Crypto AES treats all the payloads as AAD and returns the payloads as cleartext together with the 16B ICV. The MACsec IP then discards the 16B ICV on the Crypto Egress.

Table 49.  Crypto Ingress Interface Showing Bypass Packet
TID[31:26] - Stream ID Packet 1 X X
TID[25:16] - Channel Packet 1 X X
TID[15:10] - Stream Packet 0 0 0
TID[9:0] - Channel Packet 0 23 6
Data[127:0] IV + AAD_Len (FFFF_FFFF) DATA (Pkt 0)
Data[255:128] DATA (Pkt 0) DATA (Pkt 0)
Data[383:256] DATA (Pkt 0) DATA (Pkt 0)
Data[511:384] DATA (Pkt 0) IDLE
Table 50.  Crypto Egress Interface Showing Bypass Packet
TID[31:26] - Stream ID Packet 1 X X
TID[25:16] - Channel Packet 1 X X
TID[15:10] - Stream Packet 0 0 0
TID[9:0] - Channel Packet 0 23 6
Data[127:0] DATA (Pkt 0) DATA (Pkt 0)
Data[255:128] DATA (Pkt 0) DATA (Pkt 0)
Data[383:256] DATA (Pkt 0) MAC (Discard)
Data[511:384] DATA (Pkt 0) IDLE
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