IPsec_GW Reference Pipeline User Guide (UG1671)

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1.1 English

P4I and P4E consist of eight match-action stages, and have a parser and a deparser unit at the beginning and end (respectively) of the pipeline. The RxDMA and TxDMA have eight match-action stages each and do not have a parser or deparser unit but instead feed into dedicated DMA blocks at the end of the pipeline. The SxDMA pipeline in Elba has four match-action stages and its own DMA block, and is intended for offload unit control and other memory-to-memory transfers, not to manipulate packets. The match-action stages in all pipelines are identical and consist of a lookup unit called Table Engine (TE) and four Match Processing Units (MPUs) at each stage that execute the P4 action code.