US 8,429,325 B1 · PCI express switch and method for multi-port non-transparent switching · patentgrep

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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.

Claims30

Dependent claims

A PCIe switch for routing peripheral component interconnect express packets, the PCIe switch comprising:

a plurality of ports including a source port and a plurality of destination ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain, the source non-transparent endpoint configured to receive a request packet including a destination address and a requester identifier, the PCIe switch configured to identify an entry in an address translation table based on the destination address, the entry including a translated base address and a destination domain identifier identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains, generate a translated requester identifier for identifying the requester identifier and the source bus hierarchy domain, generate a translated address using the translated base address of the entry in the address translation table, and generate a translated request packet based on the request packet, the translated request packet including the translated requester identifier and the translated address;
and
a non-transparent interconnect coupled to the plurality of ports and configured to route the translated request packet to a destination non-transparent endpoint associated with the destination bus hierarchy domain in a destination port of the plurality of ports based on the destination domain identifier.

A PCIe switch for routing peripheral component interconnect express packets, the PCIe switch comprising:

a plurality of ports including a source port and a plurality of destination ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain, the source non-transparent endpoint configured to receive a request packet including a destination address and a requester identifier, wherein the PCIe switch is further configured to determine a destination domain identifier identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains based on the destination address, identify an entry in a requester identifier translation table by matching a source domain identifier of the source bus hierarchy domain with a source domain identifier of the entry in the requester identifier translation table and matching the requester identifier of the request packet with a requester identifier of the entry in the requester identifier translation table, generate a translated requester identifier for identifying the requester identifier and the source bus hierarchy domain, and generate a translated request packet based on the request packet and including the translated requester identifier;
and
a non-transparent interconnect coupled to the plurality of ports and configured to route the translated request packet to a destination non-transparent endpoint associated with the destination bus hierarchy domain in a destination port of the plurality of ports based on the destination domain identifier.

A PCIe switch for routing peripheral component interconnect express packets, the PCIe switch comprising:

a plurality of ports including a source port and a plurality of destination ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain, the source non-transparent endpoint configured to receive a request packet including a destination address and a requester identifier, the PCIe switch configured to determine a destination domain identifier identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains based on the destination address, generate a translated requester identifier, and generate a translated request packet based on the request packet and including the translated requester identifier;
a non-transparent interconnect coupled to the plurality of ports and configured to route the translated request packet to a destination non-transparent endpoint associated with the destination bus hierarchy domain in a destination port of the plurality of ports based on the destination domain identifier;
and,
wherein the destination non-transparent endpoint is further configured to receive a completion packet including the translated requester identifier and a completer identifier identifying a destination device in the destination bus hierarchy domain, identify the requester identifier based on the translated requester identifier, identify the source bus hierarchy domain based on the translated requester identifier, generate a translated completion packet based on the completion packet and including the requester identifier and the completer identifier, and provide the translated completion packet to the non-transparent interconnect, and wherein the non-transparent interconnect is further configured to route the translated completion packet to the source non-transparent endpoint.

1 more element

A PCIe switch for routing peripheral component interconnect express packets, the PCIe switch comprising:

a plurality of ports including a source port and a plurality of destination ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain, the source non-transparent endpoint configured to receive a request packet including a destination address and a requester identifier, determine a destination domain identifier identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains based on the destination address, generate a translated requester identifier for identifying the requester identifier and the source bus hierarchy domain, and generate a translated request packet based on the request packet and including the translated requester identifier;
a non-transparent interconnect coupled to the plurality of ports and configured to route the translated request packet to a destination non-transparent endpoint associated with the destination bus hierarchy domain in a destination port of the plurality of ports based on the destination domain identifier;
and,
wherein, when the request packet is a multicast packet, the source non-transparent endpoint is further configured to identify destination bus hierarchy domains from among the plurality of bus hierarchy domains based on the destination address, generate translated addresses in the destination bus hierarchy domains based on the destination address, and generate translated request packets based on the multicast packet and each including one of the translated addresses and the requester identifier, and wherein the non-transparent interconnect is further configured to route the translated request packets to corresponding destination non-transparent endpoints associated with the destination bus hierarchy domains in destination ports of the plurality of ports.

1 more element

A PCIe switch for routing peripheral component interconnect express packets, the PCIe switch comprising:

a plurality of ports including a source port and a plurality of destination ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain, the source non-transparent endpoint configured to receive a multicast packet including a destination address and a requester identifier, accept the multicast packet based on a base address of the destination address, determine destination domain identifiers identifying corresponding destination bus hierarchy domains based on the destination address, generate a translated requester identifier for identifying the requester identifier and the source bus hierarchy domain, and generate translated request packets based on the multicast packet, each translated request packet including the translated requester identifier;
a non-transparent interconnect coupled to the plurality of ports and configured route the translated request packets to corresponding destination non-transparent endpoints associated with the destination bus hierarchy domains in destination ports of the plurality of ports based on the destination domain identifiers;
and
wherein the PCIe switch is configured to maintain an address translation table comprising a plurality of entries each including a destination domain identifier and a translated base address, the destination domain identifier and the translated base address of each entry of the plurality of entries in the address translation table together defining a multicast group for identifying a plurality of destination domain identifiers and a corresponding plurality of translated base addresses, and the PCIe switch is further configured to identify an entry in the address translation table based on an index of the destination address, generate the translated addresses by combining an offset of the destination address with the plurality of translated base addresses of the entry in the address translation table, and identify the destination bus hierarchy domains based on the plurality of destination domain identifiers of the entry in the address translation table.

1 more element

A method of routing peripheral component interconnect packets through a PCIe switch comprising a plurality of ports and a non-transparent interconnect coupled to the plurality of ports, the method comprising:

receiving a request packet including a destination address and a requester identifier at a source port of the plurality of ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain;
identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains based on the destination address;
maintaining a requester identifier translation table in the PCIe switch, the requester identifier translation table comprising a plurality of entries, each of the plurality of entries including a source domain identifier and a requester identifier;
identifying an entry in the requester identifier translation table by matching a source domain identifier of the source bus hierarchy domain with the source domain identifier of the entry in the requester identifier translation table and matching the requester identifier of the request packet with the requester identifier of the entry in the requester identifier translation table;
generating a translated requester identifier for identifying the requester identifier and the source bus hierarchy domain;
generating a translated request packet based on the request packet and including the translated requester identifier;
and
routing the translated request packet through the non-transparent interconnect of the PCIe switch to a destination non-transparent endpoint associated with the destination bus hierarchy domain.

5 more elements

A method of routing peripheral component interconnect packets through a PCIe switch comprising a plurality of ports and a non-transparent interconnect coupled to the plurality of ports, the method comprising:

receiving a request packet including a destination address and a requester identifier at a source port of the plurality of ports, the source port comprising a source non-transparent endpoint associated with a source bus hierarchy domain;
identifying a destination bus hierarchy domain from among a plurality of destination bus hierarchy domains based on the destination address;
generating a translated requester identifier for identifying the requester identifier and the source port;
generating a translated request packet based on the request packet and including the translated requester identifier;
routing the translated request packet through the non-transparent interconnect of the PCIe switch to a destination non-transparent endpoint associated with the destination bus hierarchy domain;
modifying the translated requester identifier in the translated request packet to identify the destination port;
outputting the translated request packet from the destination port for routing to a destination device in the destination bus hierarchy domain;
receiving a completion packet at the destination port in response to outputting the translated request packet from the destination port, the completion packet including the translated requester identifier and a completer identifier identifying the destination device;
identifying the requester identifier of request packet based on the translated requester identifier in the completion packet;
generating a translated completion packet based on the completion packet and including the requester identifier and the completer identifier;
routing the translated completion packet through the non-transparent interconnect to the source non-transparent endpoint of the source port;
and
modifying the completer identifier in the translated completion packet to identify the source port.

10 more elements

Dependencies are inferred from the claim text.