Processing of inbound back-to-back completions in a communication system

A method for processing inbound back-to-back completions by sharing completion update information via a completion table, the method comprising:

• receiving a first packet comprising completion data on a first multi-stage pipeline and a second packet comprising completion data on a second multi-stage pipeline in parallel at an input/output adapter connected to a controller,
• wherein the inbound back-to-back completions comprises the first and second packets of the plurality of packets;
• determining that the completion data of the first packet and the completion data of the second packet are associated with a same request to generate the completion update information;
• stores and shares the completion update information in the completion table accessible by the first multi-stage pipeline and the second multi-stage pipeline;
• and
• adjusting completion update information to maintain a sequential completion order in a buffer to hold the completion data of the first packet and the completion data of the second packet based on the sharing of the completion update information between the first multi-stage pipeline and the second multi-stage pipeline,
• wherein the completion update information comprises an address offset in the buffer and a byte count remaining for a completion data entry in the buffer corresponding to the same request.

A computer program product comprising a computer readable storage medium having program instructions for processing inbound back-to-back completions by sharing completion update information via a completion table embodied therewith, the program instructions executable by a processing circuit of a controller to cause the processing circuit to perform:

• receiving a first packet comprising completion data on a first multi-stage pipeline and a second packet comprising completion data on a second multi-stage pipeline in parallel at an input/output adapter connected to a controller,
• wherein the inbound back-to-back completions comprises the first and second packets of the plurality of packets;
• determining that the completion data of the first packet and the completion data of the second packet are associated with a same request to generate the completion update information;
• stores and shares the completion update information in the completion table accessible by the first multi-stage pipeline and the second multi-stage pipeline;
• and
• adjusting completion update information to maintain a sequential completion order in a buffer to hold the completion data of the first packet and the completion data of the second packet based on the sharing of the completion update information between the first multi-stage pipeline and the second multi-stage pipeline,
• wherein the completion update information comprises an address offset in the buffer and a byte count remaining for a completion data entry in the buffer corresponding to the same request.