Pci express switch and method for multi-port non-transparent switching

Abstract

A peripheral component interconnect express (PCIe) switch includes non-transparent endpoints, each of which is associated with a bus hierarchy domain. A source non-transparent endpoint in a source bus hierarchy domain receives a packet including a destination address and identifies a destination bus hierarchy domain including a destination non-transparent endpoint based on the destination address. Further, the source non-transparent endpoint translates a requester identifier in the packet to a translated requester identifier and generates a translated request packet including the translated requester identifier. The PCIe switch routes the translated request packet to the destination non-transparent endpoint through a non-transparent interconnect in the PCIe switch. In this way, the PCIe switch interconnects multiple bus hierarchy domains and is non-transparent in the multiple bus hierarchy domains. In further embodiments, the PCIe switch routes multicast packets to multiple destination non-transparent endpoints in multiple destination bus hierarchy domains.