Method and system for handling out-of-order segments in a wireless system via direct data placement

A system comprising:

• a host buffer configured to store data;
• a processor in data communication with the host buffer and configured to parse received transmission control protocol (TCP) segments received by a wireless network processor into corresponding TCP header segments or corresponding TCP data segments,
• the processor further configured to associate the received TCP segments with a pre-existing end-to-end TCP/IP connection established by the wireless network processor using the TCP header segments,
• the processor further configured to retrieve stored connection state information for the end-to-end TCP/IP connection and direct data movement of the TCP data segments according to the retrieved connection state information and direction information of the TCP header segments;
• the processor further configured to store the parsed incoming TCP segments in the host buffer, the processor further configured to determine from the parsed incoming TCP segments, one or more previously received TCP segments and a subsequent received TCP segment, whether a current received TCP segment is an in-order TCP segment or an out-of-order TCP segment with respect to a previously received TCP segment;
• and
• when the current received TCP segment is an out-of-order TCP segment:
• the processor being further configured to store control information associated with the out-of-order TCP segment at the wireless network processor;
• the processor being further configured to place data defining the out-of-order TCP segment in the corresponding portions of the host buffer based on the stored control information so that the out-of-order TCP segment is in order with respect to one or more previously received TCP segments;
• and
• recording TCP segment data indicating one or both of
• a starting address of the placed data defining the out-of-order TCP segment and an ending address of the placed data defining the out-of-order TCP segment, and
• a start buffer address of the placed data defining the out-of-order TCP segment plus information about length of the placed data defining the out-of-order TCP segment, and
• recording control information associated with the recorded TCP segment data;
• and
• wherein the processor is configured to place the data defining the in-order TCP segment adjacent to an immediately previously received TCP segment in the host buffer, if the current received TCP segment is an in-order TCP segment.

A method comprising:

• receiving transmission control protocol (TCP) segments at a wireless network processor;
• parsing the incoming TCP segments at the wireless network processor into corresponding TCP header segments and corresponding TCP data segments;
• identifying an offloaded TCP/IP connection previously established by the wireless network processor and for which at least some TCP state information is stored by the wireless network processor;
• associating the incoming TCP segments with an identified end-to-end TCP/IP connection using the TCP header segments;
• retrieving the stored TCP state information for the identified end-to-end TCP/IP connection;
• directing data movement of the TCP data segments according to the retrieved connection state information and direction information of the TCP header segments,
• storing data defining the parsed incoming TCP segments in a host buffer which is in data communication with the wireless network processor,
• defining a TCP window among storage locations of the host buffer;
• for the incoming TCP segments, determining whether a current received TCP segment is an in-order TCP segment or an out-of-order TCP segment with respect to a previously received TCP segment;
• and
• for an out-of-order TCP segment:
• storing control information associated with the out-of-order TCP segment locally on the wireless network processor;
• placing the out-of-order TCP segment in the corresponding portions of the host buffer based on the stored control information so that the current received out-of-order TCP segment is in order with respect to previously received TCP segments;
• adjusting the TCP window to an end of a last in-order received TCP segment upon placement of the one or more previously received TCP segments in the corresponding portions of the host buffer;
• and one of
• adjusting a left edge of the TCP window to the next byte immediately following an end of a last in-order received TCP segment placed adjacent to a first received TCP segment, and
• adjusting the left edge of the TCP window to a next byte immediately following an end of a last out-of-order TCP segment of a plurality of out-of-order TCP segments placed adjacent to an end of a last in-order previously received TCP segment.