| 摘要 |
A method is disclosed to manage platform management messages through multiple peripheral component interconnect express (PCIe) segments implemented on a root complex of a computing system, the method comprising: receiving a PCIe management message as a management component transport protocol (MCTP) packet, wherein the MCTP packet utilizes a vendor defined message (VDM) format; extracting a PCIe bus segment identifier from a destination endpoint identifier (EID) field of the MCTP packet; and routing the received PCIe management message to a PCIe bus segment identified by the PCIe bus segment identifier. The computing system contains more than 256 PCIe bus numbers. Yet, each PCIe bus is assigned to a combination of endpoint identifier and segment identifier and the combination of EID and segment identifier is used to route packet. The computing system may thus route across multiple PCIe bus segments as long as elements of the computing system agree on the particular bit positions being reserved for source segment ID in the source EID field and the particular bit positions being reserved for target segment ID in the VDM format. When MCTP packet 192 is routed at bus owner 190, it may still use eight bits to identify PCIe buses, but it uses a combination of EID and segment identifier, and now it can address every PCIe bus, even the one at reference 198. The BIOS of the computing system may specify a number of bits within the EID destination field of the VDM format of the received PCIe message is to be interpreted as a PCIe bus segment identifier. |
