EP80579 Datasheet, PDF (1390/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
— If FIN flag = 1, it is cleared in these frames.
— If PSH flag =1, it is cleared in these frames.
— TCP Checksum
• UDP Header
— UDP Length: MSS + HDRLEN - TUCSS
— UDP Checksum
37.5.7.9.3
TCP/IP/UDP Header for the Last Frame
The hardware makes the following changes to the headers for the last frame of a TCP
segmentation context:
Note:
Last frame payload bytes = PAYLEN - (N * MSS)
• IPv4 Header
— IP Total Length = (last frame payload bytes + HDRLEN) - IPCSS
— IP Identification: incremented from last value (wraps around)
— IP Checksum
• IPv6 Header
— Payload Length = MSS + HDRLEN - IPCSS
• TCP Header
— Sequence Number update: Add previous TCP payload size to the previous
sequence number value. This is equivalent to adding the MSS to the previous
sequence number.
— If FIN flag = 1, set it in this last frame
— If PSH flag =1, set it in this last frame
— TCP Checksum
• UDP Header
— UDP length: (last frame payload bytes + HDRLEN) - TUCSS
— UDP Checksum
Intel^® EP80579 Integrated Processor Product Line Datasheet
1390
August 2009
Order Number: 320066-003US