Insertion of network data checksums by a network adapter

Details Insertion of network data checksums by a network adapter Insertion of network data checksums by a network adapter

1992-05-29

1995-07-04

Lee, Thomas C.

Excavating

395575, 371 376, 371 377, 3642602, 3642665, 3642666, 3642651, G06F 1312, G06F 1314

Patent

active

054308429

ABSTRACT:
A system implements checksumming of a network packet to be sent over a network. A processor constructs the network packet within a main memory. The network packet is transferred from the main memory to a packet storage memory within a network adapter. During the transfer, the network adapter calculates a checksum for the network packet. The network adapter then inserts the checksum into the network packet within the packet storage memory. The network adapter then sends the network packet to the network. In order to calculate the checksum for the network packet, hardware within the network adapter "snoops" an internal bus within the network adapter as the network packet is transported to the packet storage memory. Also, a checksum header is prepended to the network packet which includes control information for checksumming. This control information includes, for example, an indication whether the network adapter is to calculate a checksum and a specification of what data in the network packet is to be checksummed. The control information may additionally include a location within network packet where the checksum is to be inserted.

REFERENCES:
patent: 4168469 (1979-09-01), Parikh et al.
patent: 5058110 (1981-10-01), Beech et al.
CMC-1050 Series FDDI/FXP 9u Intelligent Controller (Revision Level B) Reference Guide, p. 318.

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