Methods and systems for providing a virtualized NVMe over fabric service

A system comprising

• a PCIe device configured to:
• associate a request identifier with a command identifier of a submission queue element (SQE) after reading the SQE from a submission queue (SQ), the SQE including the command identifier, an OpCode, and a namespace identifier (NSID);
• produce a first local transport protocol (LTP) packet that includes the opcode, the NSID, and the request identifier after reading the SQE from the SQ;
• send the first LTP packet to a service node;
• receive, in response to sending the first LTP packet, a second LTP packet that includes the request identifier and a status indicator;
• use the request identifier in the second LTP packet to identify the command identifier;
• use the command identifier, the status indicator and the request identifier to produce a completion queue entry (CQE) that is responsive to the SQE;
• and
• place the CQE on a completion queue (CQ) associated with the SQ,
• wherein the SQ is an NVMe SQ, and the CQ is an NVMe CQ.

A system comprising a service node configured to:

• receive, from a host computer, a first internet protocol (IP) packet that includes a first local transport protocol (LTP) packet that includes an NVMe opcode, an NSID indicating an NVMe namespace, a PCIe device identifier, and a PCIe device request identifier;
• use the first LTP packet to produce a first NVMe capsule;
• send the first NVMe capsule to an NVMe controller;
• receive a second NVME capsule that is responsive to the first NVMe capsule;
• use the second NVMe capsule to produce a second LTP packet that includes the PCIe device request identifier, the PCIe device identifier, the PCIe device request identifier, and a status indicator;
• and
• send the second LTP packet to the host computer.

A system comprising:

• a local means for processing local NVMe submissions to produce upstream packets that use a local transport protocol (LTP);
• a means for associating a command identifier in a NVMe SQE with a request identifier in a LTP packet;
• a means for using the request identifier to include the command identifier in an NVMe CQE that is responsive to the NVMe SQE;
• and
• an intermediate means for interacting with a storage area network (SAN) via NVMe capsules that are produced from the upstream packets and for communicating SAN operation results to the local means,
• wherein:
• the LTP packet includes an NVMe opcode, an NSID indicating an NVMe namespace, a PCIe device identifier, and the request identifier;
• and
• the intermediate means interacts with the SAN via a computer network.