Translating CXL.io UIO for Cross-Protocol Memory Access and Legacy Infrastructure Integration

An apparatus comprising:

• a first interface configured to communicate with a first entity based on CXL.io Unordered Input/Output (UIO), wherein CXL denotes Compute Express Link;
• a second interface configured to communicate with a second entity based on Peripheral Component Interconnect Express (PCIe);
• and
• a computer coupled to the first interface and the second interface, the computer configured to:
• receive, via the first interface, a CXL.io UIO Memory Read (UIOMRd) request comprising a first address and a first Tag;
• translate the CXL.io UIOMRd to a PCIe memory request comprising a second address and a second Tag;
• and
• send, via the second interface, the PCIe memory request to the second entity.

A system comprising:

• a first entity configured to communicate based on CXL.io Unordered Input/Output (UIO), wherein CXL denotes Compute Express Link;
• a second entity configured to communicate based on Peripheral Component Interconnect Express (PCIe);
• and
• a computer coupled between the first entity and the second entity, the computer configured to:
• receive, from the first entity, a CXL.io UIO Memory Read (UIOMRd) request comprising a first address;
• translate the CXL.io UIOMRd to a PCIe memory request comprising a second address;
• send, to the second entity, the PCIe memory request;
• receive, from the second entity, a PCIe Completion corresponding to the PCIe memory request;
• translate the PCIe Completion to a CXL.io UIO Read Completion with Data (UIORdCplD);
• and
• send, to the first entity, the CXL.io UIORdCplD.

A method for translating between Compute Express Link (CXL) Transaction Layer Packets (TLPs), comprising:

• receiving, from a first entity, a CXL.io Memory Read (MRd) request comprising a first address and a first Tag;
• translating, by a computer, the CXL.io MRd to a CXL.io Unordered Input/Output (UIO) Memory Read (UIOMRd) request comprising a second address and a second Tag;
• sending, to a second entity, the CXL.io UIOMRd;
• receiving, from the second entity, a CXL.io UIO Read Completion with Data (UIORdCplD) comprising the second Tag and a data payload;
• translating, by the computer, the CXL.io UIORdCplD to a CXL.io Completion with Data (CplD) comprising the first Tag and the data payload;
• and sending, to the first entity, the CXL.io CplD.