Offload of TCP segmentation to a smart adapter

Details Offload of TCP segmentation to a smart adapter Offload of TCP segmentation to a smart adapter

1997-10-29

1999-08-10

Harrell, Robert B.

G06F 1338

Patent

active

059371692

ABSTRACT:
A method is provided for sending data from a data source executing a network protocol such as the TCP/IP protocol stack, which includes a process for generating headers for packets according to the network protocol. The method includes sending such data on a network through a smart network interface. The network protocol defines a datagram in the data source, including generating a header template and supplying a data payload. The datagram is supplied to the network interface. At the network interface, a plurality of packets of data are generated from the datagram. The plurality of packets include respective headers, such as TCP/IP headers, based on the header template, and include respective segments of the data payload. The network interface supports packets having a pre-specified length, and the data payload is greater than the pre-specified length, such as two to forty times larger or more. Thus, the higher layer processing specifies a very large datagram, which is automatically segmented at the network interface layer, instead of at the TCP layer.

REFERENCES:
patent: 5321819 (1994-06-01), Szczepanek
patent: 5727149 (1998-03-01), Hirata et al.
Postel, J., "The TCP Maximum Segment Size and Related Topics", rfc879, dated Nov. 1983, printed from web site "http:// www.cis.ohio-state.edu/htbin/rfc", 10 pages.
Clark, D., "Window and Acknowledgement Strategy in TCP", rfc813, dated Jul. 1982, printed from web site "http:// www.cis.ohio-state.edu/htbin/rfc", 18 pages.
"Transmission Control Protocol: DARPA Internet Program Protocol Specification", rfc793, prepared by Univ. of Southern Calif., dated Sep. 1981, printed from web site "http:// www.cis.ohio-state.edu/htbin/rfc", 77 pages.
"Internet Protocol: DARPA Internet Program Protocol Specification", rfc 791, prepared by Univ. of Southern Calif., dated Sep. 1981, printed from web site "http:// www.cis.ohio-state.edu/htbin/rfc", 42 pages.
Gilbert, H., "Introduction to TCP/IP", dated Feb. 2, 1995, printed from web site "http://pclt.cis.yale.edu/pclt/comm/tcpip.htm", 5 pages.

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