TCP Segmentation Offload Engine Hardware Firmware Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The shift in networking assumptions from scarce bandwidth to limited processing resources creates bottlenecks in host systems, requiring efficient TCP processing offload solutions that are not adequately addressed by existing TCP segmentation and offload engines, which are complex, resource-intensive, and inflexible.
Innovation Solution
A method and system for packet segmentation and offload that selectively processes large send offload packets using a combination of hardware and firmware processes, allowing for efficient segmentation and offload of TCP packets, freeing up host CPU resources and optimizing processing by reusing header information across segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a TOE is configured to implement various TCP algorithms for handling faster network connections, then network processing capability is improved, but host system resources are depleted and system application performance degrades
Solution Approach 1:
The patent extracts and offloads TCP segmentation functionality from the host system to a dedicated TOE device. The TOE is configured with hardware circuits that specifically handle TCP segmentation operations, removing this processing burden from the host CPU and dedicated network processing resources, thereby resolving the resource depletion issue while maintaining improved network processing capability
Solution Approach 2:
The TOE acts as an intermediary device between the host system and the network. It receives TCP segments from the host, performs the segmentation offload operations, and transmits the segmented data to the network. This intermediary approach allows the host to offload resource-intensive TCP processing while the TOE handles these operations using its dedicated hardware resources
2Productivity
If TCP connection state information is offloaded from the host to the TOE, then host resource consumption is reduced, but TOE architectural complexity increases
Solution Approach 1:
The patent segments the TCP state management responsibilities between the host and the TOE. The TOE is configured to maintain specific TCP connection state information related to segmentation operations, while the host retains overall TCP connection management. This segmentation of state information reduces host resource consumption while keeping the TOE's complexity manageable by limiting its state management scope to segmentation-specific states
3Productivity
If a TOE controls all state variables of a TCP connection, then TCP processing capability is improved, but the TOE becomes inflexible and susceptible to connection loss
Solution Approach 1:
The patent implements a dynamic state management approach where the TOE controls segmentation-related state variables while the host maintains overall connection state. This dynamic distribution allows the system to adapt to different connection scenarios and maintains flexibility. The TOE can operate independently for segmentation tasks while the host provides higher-level connection management, preventing connection loss through distributed state control
Data Source
AI summary
Certain aspects of the invention for packet segmentation and offload may comprise determining whether an identified packet is a large send offload packet (LSOP). If the identified packet is a LSOP, a selection may be made between a hardware process and a firmware process for handling the LSOP. The LSOP may then be processed by the selected hardware process or firmware process. At least a portion of protocol header information for a first segment of the LSOP may be stored and subsequently utilized for at least a header portion of a second segment of the LSOP. A payload corresponding to the second segment of the LSOP may be placed at a determined offset within a transmit buffer for the second segment. A header portion of the second segment may be updated based on at least a header portion of a previous segment.