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. Encryption Framer/DeFramer

The Encryption Framer/Deframer is responsible for performing framing on the packet, which arrives after SA lookup and error checking on the packet when the packet returns from Crypto AES through packet disaggregator.

Below is a list of features implemented in the Encryption Framer/Deframer:
  • Upon packet arrival from SA lookup, channel allocation is performed by sending a key to the Crypto AES to allocate a new channel. Channel number is sent through the AXI-ST TID[9:0] signal.
  • If USR_DATA_WIDTH is not 512b, the framer is required to accumulate enough bytes from subsequent request data bus per stream in the subsequent cycle for processing.
  • SecTAG insertion is performed into the packet.
  • SA lookup result is packed into the packet payload, for example, IV, AAD.
  • IV – {SCI, PN[31:0]} when XPN_MODE = 0,
  • IV – {SSCI XOR SALT[95:64], SALT[63:0] XOR PN[63:0]} when XPN_MODE = 1
  • AAD – {Destination MAC Address, Source MAC Address, VLAN tag (In Clear), MACsec Header, {0B, 30B, 50B Offset Confidentiality}}
  • The tlast_empty ppmetadata indication is received from the Multi Interface Buffering Mux and rotation buffer data is submitted to Crypto without waiting for subsequent packet for data packing.
  • Equation to calculate AAD_Length is as below:
  • AAD_Length = 6 (DMAC) + 6 (SMAC) + (0 or 4, depending on VLAN tag) + (8 or 16 SecTAG depending on SCI existence) + TX_LANE_SC{0..1}_SA{0..3}_CONFID CSR
  • Packet bypass is performed if protectFrames of the packet is not set.
  • IV/Key byte order swapping occurs before sending to Crypto.
  • The user packet bypasses metadata storing per stream/port and it is pending for return packet.
  • Packet metadata carrys error indication for the packet entering and leaving the MACsec IP.
  • After the packet returns from the Crypto AES through the Packet Disaggregator, error handling is performed on the returned packet.
  • User packet bypass metadata is extracted from the stream/port FIFO and associated with the returned packet based on the stream/port ID.

Section Content
Channel Allocation
Packet Framer
VLAN Tagging

Level Two Title