Fast-path apparatus for receiving data corresponding to a TCP connection
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United States of America Patent
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Jul 8, 2003
Grant Date -
Oct 10, 2002
app pub date -
Mar 6, 2002
filing date -
Oct 14, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A network interface device provides a fast-path that avoids most host TCP and IP protocol processing for most messages. The host retains a fallback slow-path processing capability. In one embodiment, generation of a response to a TCP/IP packet received onto the network interface device is accelerated by determining the TCP and IP source and destination information from the incoming packet, retrieving an appropriate template header, using a finite state machine to fill in the TCP and IP fields in the template header without sequential TCP and IP protocol processing, combining the filled-in template header with a data payload to form a packet, and then outputting the packet from the network interface device by pushing a pointer to the packet onto a transmit queue. A transmit sequencer retrieves the pointer from the transmit queue and causes the corresponding packet to be output from the network interface device.
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