Out of order checksum calculation for fragmented packets

Details Out of order checksum calculation for fragmented packets Out of order checksum calculation for fragmented packets

2003-03-12

2008-08-19

Lamarre, Guy J (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C709S230000

Reexamination Certificate

active

07415652

ABSTRACT:
A network device having a method and computer-readable media includes a processor adapted to receive a first fragment of a packet. The first fragment includes a first portion of a payload of the packet and a header of the packet, the header comprising a checksum field. The processor receives a second fragment of the packet, the second fragment includes a second portion of the payload of the packet. The processor transmits the second fragment of the packet to a network interface controller and subsequently transmits the first fragment of the packet to the network interface controller. The network interface controller includes a checksum adder adapted to calculate a checksum of the second fragment of the packet, and calculate a checksum of the first fragment of the packet after calculating a checksum of the second fragment of the packet. The checksum of the first fragment of the packet includes the checksum of the second fragment of the packet. The checksum adder also writes the checksum of the first fragment of the packet to the checksum field in the header of the packet.

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